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v6.13.7
   1// SPDX-License-Identifier: GPL-2.0+
   2// Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
   3// Copyright (C) 2008 Juergen Beisert
   4
   5#include <linux/bits.h>
   6#include <linux/bitfield.h>
   7#include <linux/clk.h>
   8#include <linux/completion.h>
   9#include <linux/delay.h>
  10#include <linux/dmaengine.h>
  11#include <linux/dma-mapping.h>
  12#include <linux/err.h>
 
  13#include <linux/interrupt.h>
  14#include <linux/io.h>
  15#include <linux/irq.h>
  16#include <linux/kernel.h>
  17#include <linux/math.h>
  18#include <linux/math64.h>
  19#include <linux/module.h>
  20#include <linux/overflow.h>
  21#include <linux/pinctrl/consumer.h>
  22#include <linux/platform_device.h>
  23#include <linux/pm_runtime.h>
  24#include <linux/slab.h>
  25#include <linux/spi/spi.h>
 
  26#include <linux/types.h>
  27#include <linux/of.h>
  28#include <linux/property.h>
 
  29
  30#include <linux/dma/imx-dma.h>
 
  31
  32#define DRIVER_NAME "spi_imx"
  33
  34static bool use_dma = true;
  35module_param(use_dma, bool, 0644);
  36MODULE_PARM_DESC(use_dma, "Enable usage of DMA when available (default)");
  37
  38/* define polling limits */
  39static unsigned int polling_limit_us = 30;
  40module_param(polling_limit_us, uint, 0664);
  41MODULE_PARM_DESC(polling_limit_us,
  42		 "time in us to run a transfer in polling mode\n");
  43
  44#define MXC_RPM_TIMEOUT		2000 /* 2000ms */
  45
  46#define MXC_CSPIRXDATA		0x00
  47#define MXC_CSPITXDATA		0x04
  48#define MXC_CSPICTRL		0x08
  49#define MXC_CSPIINT		0x0c
  50#define MXC_RESET		0x1c
  51
  52/* generic defines to abstract from the different register layouts */
  53#define MXC_INT_RR	(1 << 0) /* Receive data ready interrupt */
  54#define MXC_INT_TE	(1 << 1) /* Transmit FIFO empty interrupt */
  55#define MXC_INT_RDR	BIT(4) /* Receive date threshold interrupt */
  56
  57/* The maximum bytes that a sdma BD can transfer. */
  58#define MAX_SDMA_BD_BYTES (1 << 15)
  59#define MX51_ECSPI_CTRL_MAX_BURST	512
  60/* The maximum bytes that IMX53_ECSPI can transfer in target mode.*/
  61#define MX53_MAX_TRANSFER_BYTES		512
  62
  63enum spi_imx_devtype {
  64	IMX1_CSPI,
  65	IMX21_CSPI,
  66	IMX27_CSPI,
  67	IMX31_CSPI,
  68	IMX35_CSPI,	/* CSPI on all i.mx except above */
  69	IMX51_ECSPI,	/* ECSPI on i.mx51 */
  70	IMX53_ECSPI,	/* ECSPI on i.mx53 and later */
  71};
  72
  73struct spi_imx_data;
  74
  75struct spi_imx_devtype_data {
  76	void (*intctrl)(struct spi_imx_data *spi_imx, int enable);
  77	int (*prepare_message)(struct spi_imx_data *spi_imx, struct spi_message *msg);
  78	int (*prepare_transfer)(struct spi_imx_data *spi_imx, struct spi_device *spi,
  79				struct spi_transfer *t);
  80	void (*trigger)(struct spi_imx_data *spi_imx);
  81	int (*rx_available)(struct spi_imx_data *spi_imx);
  82	void (*reset)(struct spi_imx_data *spi_imx);
  83	void (*setup_wml)(struct spi_imx_data *spi_imx);
  84	void (*disable)(struct spi_imx_data *spi_imx);
  85	bool has_dmamode;
  86	bool has_targetmode;
  87	unsigned int fifo_size;
  88	bool dynamic_burst;
  89	/*
  90	 * ERR009165 fixed or not:
  91	 * https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf
  92	 */
  93	bool tx_glitch_fixed;
  94	enum spi_imx_devtype devtype;
  95};
  96
  97struct spi_imx_data {
  98	struct spi_controller *controller;
  99	struct device *dev;
 100
 101	struct completion xfer_done;
 102	void __iomem *base;
 103	unsigned long base_phys;
 104
 105	struct clk *clk_per;
 106	struct clk *clk_ipg;
 107	unsigned long spi_clk;
 108	unsigned int spi_bus_clk;
 109
 110	unsigned int bits_per_word;
 111	unsigned int spi_drctl;
 112
 113	unsigned int count, remainder;
 114	void (*tx)(struct spi_imx_data *spi_imx);
 115	void (*rx)(struct spi_imx_data *spi_imx);
 116	void *rx_buf;
 117	const void *tx_buf;
 118	unsigned int txfifo; /* number of words pushed in tx FIFO */
 119	unsigned int dynamic_burst;
 120	bool rx_only;
 121
 122	/* Target mode */
 123	bool target_mode;
 124	bool target_aborted;
 125	unsigned int target_burst;
 126
 127	/* DMA */
 128	bool usedma;
 129	u32 wml;
 130	struct completion dma_rx_completion;
 131	struct completion dma_tx_completion;
 132
 133	const struct spi_imx_devtype_data *devtype_data;
 134};
 135
 136static inline int is_imx27_cspi(struct spi_imx_data *d)
 137{
 138	return d->devtype_data->devtype == IMX27_CSPI;
 139}
 140
 141static inline int is_imx35_cspi(struct spi_imx_data *d)
 142{
 143	return d->devtype_data->devtype == IMX35_CSPI;
 144}
 145
 146static inline int is_imx51_ecspi(struct spi_imx_data *d)
 147{
 148	return d->devtype_data->devtype == IMX51_ECSPI;
 149}
 150
 151static inline int is_imx53_ecspi(struct spi_imx_data *d)
 152{
 153	return d->devtype_data->devtype == IMX53_ECSPI;
 154}
 155
 156#define MXC_SPI_BUF_RX(type)						\
 157static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx)		\
 158{									\
 159	unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA);	\
 160									\
 161	if (spi_imx->rx_buf) {						\
 162		*(type *)spi_imx->rx_buf = val;				\
 163		spi_imx->rx_buf += sizeof(type);			\
 164	}								\
 165									\
 166	spi_imx->remainder -= sizeof(type);				\
 167}
 168
 169#define MXC_SPI_BUF_TX(type)						\
 170static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx)		\
 171{									\
 172	type val = 0;							\
 173									\
 174	if (spi_imx->tx_buf) {						\
 175		val = *(type *)spi_imx->tx_buf;				\
 176		spi_imx->tx_buf += sizeof(type);			\
 177	}								\
 178									\
 179	spi_imx->count -= sizeof(type);					\
 180									\
 181	writel(val, spi_imx->base + MXC_CSPITXDATA);			\
 182}
 183
 184MXC_SPI_BUF_RX(u8)
 185MXC_SPI_BUF_TX(u8)
 186MXC_SPI_BUF_RX(u16)
 187MXC_SPI_BUF_TX(u16)
 188MXC_SPI_BUF_RX(u32)
 189MXC_SPI_BUF_TX(u32)
 190
 191/* First entry is reserved, second entry is valid only if SDHC_SPIEN is set
 192 * (which is currently not the case in this driver)
 193 */
 194static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192,
 195	256, 384, 512, 768, 1024};
 196
 197/* MX21, MX27 */
 198static unsigned int spi_imx_clkdiv_1(unsigned int fin,
 199		unsigned int fspi, unsigned int max, unsigned int *fres)
 200{
 201	int i;
 202
 203	for (i = 2; i < max; i++)
 204		if (fspi * mxc_clkdivs[i] >= fin)
 205			break;
 206
 207	*fres = fin / mxc_clkdivs[i];
 208	return i;
 209}
 210
 211/* MX1, MX31, MX35, MX51 CSPI */
 212static unsigned int spi_imx_clkdiv_2(unsigned int fin,
 213		unsigned int fspi, unsigned int *fres)
 214{
 215	int i, div = 4;
 216
 217	for (i = 0; i < 7; i++) {
 218		if (fspi * div >= fin)
 219			goto out;
 220		div <<= 1;
 221	}
 222
 223out:
 224	*fres = fin / div;
 225	return i;
 226}
 227
 228static int spi_imx_bytes_per_word(const int bits_per_word)
 229{
 230	if (bits_per_word <= 8)
 231		return 1;
 232	else if (bits_per_word <= 16)
 233		return 2;
 234	else
 235		return 4;
 236}
 237
 238static bool spi_imx_can_dma(struct spi_controller *controller, struct spi_device *spi,
 239			 struct spi_transfer *transfer)
 240{
 241	struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
 242
 243	if (!use_dma || controller->fallback)
 244		return false;
 245
 246	if (!controller->dma_rx)
 247		return false;
 248
 249	if (spi_imx->target_mode)
 250		return false;
 251
 252	if (transfer->len < spi_imx->devtype_data->fifo_size)
 253		return false;
 254
 255	spi_imx->dynamic_burst = 0;
 256
 257	return true;
 258}
 259
 260/*
 261 * Note the number of natively supported chip selects for MX51 is 4. Some
 262 * devices may have less actual SS pins but the register map supports 4. When
 263 * using gpio chip selects the cs values passed into the macros below can go
 264 * outside the range 0 - 3. We therefore need to limit the cs value to avoid
 265 * corrupting bits outside the allocated locations.
 266 *
 267 * The simplest way to do this is to just mask the cs bits to 2 bits. This
 268 * still allows all 4 native chip selects to work as well as gpio chip selects
 269 * (which can use any of the 4 chip select configurations).
 270 */
 271
 272#define MX51_ECSPI_CTRL		0x08
 273#define MX51_ECSPI_CTRL_ENABLE		(1 <<  0)
 274#define MX51_ECSPI_CTRL_XCH		(1 <<  2)
 275#define MX51_ECSPI_CTRL_SMC		(1 << 3)
 276#define MX51_ECSPI_CTRL_MODE_MASK	(0xf << 4)
 277#define MX51_ECSPI_CTRL_DRCTL(drctl)	((drctl) << 16)
 278#define MX51_ECSPI_CTRL_POSTDIV_OFFSET	8
 279#define MX51_ECSPI_CTRL_PREDIV_OFFSET	12
 280#define MX51_ECSPI_CTRL_CS(cs)		((cs & 3) << 18)
 281#define MX51_ECSPI_CTRL_BL_OFFSET	20
 282#define MX51_ECSPI_CTRL_BL_MASK		(0xfff << 20)
 283
 284#define MX51_ECSPI_CONFIG	0x0c
 285#define MX51_ECSPI_CONFIG_SCLKPHA(cs)	(1 << ((cs & 3) +  0))
 286#define MX51_ECSPI_CONFIG_SCLKPOL(cs)	(1 << ((cs & 3) +  4))
 287#define MX51_ECSPI_CONFIG_SBBCTRL(cs)	(1 << ((cs & 3) +  8))
 288#define MX51_ECSPI_CONFIG_SSBPOL(cs)	(1 << ((cs & 3) + 12))
 289#define MX51_ECSPI_CONFIG_DATACTL(cs)	(1 << ((cs & 3) + 16))
 290#define MX51_ECSPI_CONFIG_SCLKCTL(cs)	(1 << ((cs & 3) + 20))
 291
 292#define MX51_ECSPI_INT		0x10
 293#define MX51_ECSPI_INT_TEEN		(1 <<  0)
 294#define MX51_ECSPI_INT_RREN		(1 <<  3)
 295#define MX51_ECSPI_INT_RDREN		(1 <<  4)
 296
 297#define MX51_ECSPI_DMA		0x14
 298#define MX51_ECSPI_DMA_TX_WML(wml)	((wml) & 0x3f)
 299#define MX51_ECSPI_DMA_RX_WML(wml)	(((wml) & 0x3f) << 16)
 300#define MX51_ECSPI_DMA_RXT_WML(wml)	(((wml) & 0x3f) << 24)
 301
 302#define MX51_ECSPI_DMA_TEDEN		(1 << 7)
 303#define MX51_ECSPI_DMA_RXDEN		(1 << 23)
 304#define MX51_ECSPI_DMA_RXTDEN		(1 << 31)
 305
 306#define MX51_ECSPI_STAT		0x18
 307#define MX51_ECSPI_STAT_RR		(1 <<  3)
 308
 309#define MX51_ECSPI_PERIOD	0x1c
 310#define MX51_ECSPI_PERIOD_MASK		0x7fff
 311/*
 312 * As measured on the i.MX6, the SPI host controller inserts a 4 SPI-Clock
 313 * (SCLK) delay after each burst if the PERIOD reg is 0x0. This value will be
 314 * called MX51_ECSPI_PERIOD_MIN_DELAY_SCK.
 315 *
 316 * If the PERIOD register is != 0, the controller inserts a delay of
 317 * MX51_ECSPI_PERIOD_MIN_DELAY_SCK + register value + 1 SCLK after each burst.
 318 */
 319#define MX51_ECSPI_PERIOD_MIN_DELAY_SCK 4
 320
 321#define MX51_ECSPI_TESTREG	0x20
 322#define MX51_ECSPI_TESTREG_LBC	BIT(31)
 323
 324static void spi_imx_buf_rx_swap_u32(struct spi_imx_data *spi_imx)
 325{
 326	unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA);
 
 
 
 327
 328	if (spi_imx->rx_buf) {
 329#ifdef __LITTLE_ENDIAN
 330		unsigned int bytes_per_word;
 331
 332		bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
 333		if (bytes_per_word == 1)
 334			swab32s(&val);
 335		else if (bytes_per_word == 2)
 336			swahw32s(&val);
 337#endif
 338		*(u32 *)spi_imx->rx_buf = val;
 339		spi_imx->rx_buf += sizeof(u32);
 340	}
 341
 342	spi_imx->remainder -= sizeof(u32);
 343}
 344
 345static void spi_imx_buf_rx_swap(struct spi_imx_data *spi_imx)
 346{
 347	int unaligned;
 348	u32 val;
 349
 350	unaligned = spi_imx->remainder % 4;
 351
 352	if (!unaligned) {
 353		spi_imx_buf_rx_swap_u32(spi_imx);
 354		return;
 355	}
 356
 357	if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) {
 358		spi_imx_buf_rx_u16(spi_imx);
 359		return;
 360	}
 361
 362	val = readl(spi_imx->base + MXC_CSPIRXDATA);
 363
 364	while (unaligned--) {
 365		if (spi_imx->rx_buf) {
 366			*(u8 *)spi_imx->rx_buf = (val >> (8 * unaligned)) & 0xff;
 367			spi_imx->rx_buf++;
 368		}
 369		spi_imx->remainder--;
 370	}
 371}
 372
 373static void spi_imx_buf_tx_swap_u32(struct spi_imx_data *spi_imx)
 374{
 375	u32 val = 0;
 376#ifdef __LITTLE_ENDIAN
 377	unsigned int bytes_per_word;
 378#endif
 379
 380	if (spi_imx->tx_buf) {
 381		val = *(u32 *)spi_imx->tx_buf;
 382		spi_imx->tx_buf += sizeof(u32);
 383	}
 384
 385	spi_imx->count -= sizeof(u32);
 386#ifdef __LITTLE_ENDIAN
 387	bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
 388
 389	if (bytes_per_word == 1)
 390		swab32s(&val);
 391	else if (bytes_per_word == 2)
 392		swahw32s(&val);
 393#endif
 394	writel(val, spi_imx->base + MXC_CSPITXDATA);
 395}
 396
 397static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx)
 398{
 399	int unaligned;
 400	u32 val = 0;
 401
 402	unaligned = spi_imx->count % 4;
 403
 404	if (!unaligned) {
 405		spi_imx_buf_tx_swap_u32(spi_imx);
 406		return;
 407	}
 408
 409	if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) {
 410		spi_imx_buf_tx_u16(spi_imx);
 411		return;
 412	}
 413
 414	while (unaligned--) {
 415		if (spi_imx->tx_buf) {
 416			val |= *(u8 *)spi_imx->tx_buf << (8 * unaligned);
 417			spi_imx->tx_buf++;
 418		}
 419		spi_imx->count--;
 420	}
 421
 422	writel(val, spi_imx->base + MXC_CSPITXDATA);
 423}
 424
 425static void mx53_ecspi_rx_target(struct spi_imx_data *spi_imx)
 426{
 427	u32 val = ioread32be(spi_imx->base + MXC_CSPIRXDATA);
 428
 429	if (spi_imx->rx_buf) {
 430		int n_bytes = spi_imx->target_burst % sizeof(val);
 431
 432		if (!n_bytes)
 433			n_bytes = sizeof(val);
 434
 435		memcpy(spi_imx->rx_buf,
 436		       ((u8 *)&val) + sizeof(val) - n_bytes, n_bytes);
 437
 438		spi_imx->rx_buf += n_bytes;
 439		spi_imx->target_burst -= n_bytes;
 440	}
 441
 442	spi_imx->remainder -= sizeof(u32);
 443}
 444
 445static void mx53_ecspi_tx_target(struct spi_imx_data *spi_imx)
 446{
 447	u32 val = 0;
 448	int n_bytes = spi_imx->count % sizeof(val);
 449
 450	if (!n_bytes)
 451		n_bytes = sizeof(val);
 452
 453	if (spi_imx->tx_buf) {
 454		memcpy(((u8 *)&val) + sizeof(val) - n_bytes,
 455		       spi_imx->tx_buf, n_bytes);
 
 456		spi_imx->tx_buf += n_bytes;
 457	}
 458
 459	spi_imx->count -= n_bytes;
 460
 461	iowrite32be(val, spi_imx->base + MXC_CSPITXDATA);
 462}
 463
 464/* MX51 eCSPI */
 465static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx,
 466				      unsigned int fspi, unsigned int *fres)
 467{
 468	/*
 469	 * there are two 4-bit dividers, the pre-divider divides by
 470	 * $pre, the post-divider by 2^$post
 471	 */
 472	unsigned int pre, post;
 473	unsigned int fin = spi_imx->spi_clk;
 474
 475	fspi = min(fspi, fin);
 
 476
 477	post = fls(fin) - fls(fspi);
 478	if (fin > fspi << post)
 479		post++;
 480
 481	/* now we have: (fin <= fspi << post) with post being minimal */
 482
 483	post = max(4U, post) - 4;
 484	if (unlikely(post > 0xf)) {
 485		dev_err(spi_imx->dev, "cannot set clock freq: %u (base freq: %u)\n",
 486				fspi, fin);
 487		return 0xff;
 488	}
 489
 490	pre = DIV_ROUND_UP(fin, fspi << post) - 1;
 491
 492	dev_dbg(spi_imx->dev, "%s: fin: %u, fspi: %u, post: %u, pre: %u\n",
 493			__func__, fin, fspi, post, pre);
 494
 495	/* Resulting frequency for the SCLK line. */
 496	*fres = (fin / (pre + 1)) >> post;
 497
 498	return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) |
 499		(post << MX51_ECSPI_CTRL_POSTDIV_OFFSET);
 500}
 501
 502static void mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
 503{
 504	unsigned int val = 0;
 505
 506	if (enable & MXC_INT_TE)
 507		val |= MX51_ECSPI_INT_TEEN;
 508
 509	if (enable & MXC_INT_RR)
 510		val |= MX51_ECSPI_INT_RREN;
 511
 512	if (enable & MXC_INT_RDR)
 513		val |= MX51_ECSPI_INT_RDREN;
 514
 515	writel(val, spi_imx->base + MX51_ECSPI_INT);
 516}
 517
 518static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
 519{
 520	u32 reg;
 521
 522	reg = readl(spi_imx->base + MX51_ECSPI_CTRL);
 523	reg |= MX51_ECSPI_CTRL_XCH;
 524	writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
 525}
 526
 527static void mx51_ecspi_disable(struct spi_imx_data *spi_imx)
 528{
 529	u32 ctrl;
 530
 531	ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
 532	ctrl &= ~MX51_ECSPI_CTRL_ENABLE;
 533	writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
 534}
 535
 536static int mx51_ecspi_channel(const struct spi_device *spi)
 537{
 538	if (!spi_get_csgpiod(spi, 0))
 539		return spi_get_chipselect(spi, 0);
 540	return spi->controller->unused_native_cs;
 541}
 542
 543static int mx51_ecspi_prepare_message(struct spi_imx_data *spi_imx,
 544				      struct spi_message *msg)
 545{
 546	struct spi_device *spi = msg->spi;
 547	struct spi_transfer *xfer;
 548	u32 ctrl = MX51_ECSPI_CTRL_ENABLE;
 549	u32 min_speed_hz = ~0U;
 550	u32 testreg, delay;
 551	u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
 552	u32 current_cfg = cfg;
 553	int channel = mx51_ecspi_channel(spi);
 554
 555	/* set Host or Target mode */
 556	if (spi_imx->target_mode)
 557		ctrl &= ~MX51_ECSPI_CTRL_MODE_MASK;
 558	else
 559		ctrl |= MX51_ECSPI_CTRL_MODE_MASK;
 560
 561	/*
 562	 * Enable SPI_RDY handling (falling edge/level triggered).
 563	 */
 564	if (spi->mode & SPI_READY)
 565		ctrl |= MX51_ECSPI_CTRL_DRCTL(spi_imx->spi_drctl);
 566
 567	/* set chip select to use */
 568	ctrl |= MX51_ECSPI_CTRL_CS(channel);
 569
 570	/*
 571	 * The ctrl register must be written first, with the EN bit set other
 572	 * registers must not be written to.
 573	 */
 574	writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
 575
 576	testreg = readl(spi_imx->base + MX51_ECSPI_TESTREG);
 577	if (spi->mode & SPI_LOOP)
 578		testreg |= MX51_ECSPI_TESTREG_LBC;
 579	else
 580		testreg &= ~MX51_ECSPI_TESTREG_LBC;
 581	writel(testreg, spi_imx->base + MX51_ECSPI_TESTREG);
 582
 583	/*
 584	 * eCSPI burst completion by Chip Select signal in Target mode
 585	 * is not functional for imx53 Soc, config SPI burst completed when
 586	 * BURST_LENGTH + 1 bits are received
 587	 */
 588	if (spi_imx->target_mode && is_imx53_ecspi(spi_imx))
 589		cfg &= ~MX51_ECSPI_CONFIG_SBBCTRL(channel);
 590	else
 591		cfg |= MX51_ECSPI_CONFIG_SBBCTRL(channel);
 
 
 
 
 
 592
 593	if (spi->mode & SPI_CPOL) {
 594		cfg |= MX51_ECSPI_CONFIG_SCLKPOL(channel);
 595		cfg |= MX51_ECSPI_CONFIG_SCLKCTL(channel);
 596	} else {
 597		cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(channel);
 598		cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(channel);
 599	}
 600
 601	if (spi->mode & SPI_MOSI_IDLE_LOW)
 602		cfg |= MX51_ECSPI_CONFIG_DATACTL(channel);
 603	else
 604		cfg &= ~MX51_ECSPI_CONFIG_DATACTL(channel);
 605
 606	if (spi->mode & SPI_CS_HIGH)
 607		cfg |= MX51_ECSPI_CONFIG_SSBPOL(channel);
 608	else
 609		cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(channel);
 610
 611	if (cfg == current_cfg)
 612		return 0;
 613
 614	writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
 615
 616	/*
 617	 * Wait until the changes in the configuration register CONFIGREG
 618	 * propagate into the hardware. It takes exactly one tick of the
 619	 * SCLK clock, but we will wait two SCLK clock just to be sure. The
 620	 * effect of the delay it takes for the hardware to apply changes
 621	 * is noticable if the SCLK clock run very slow. In such a case, if
 622	 * the polarity of SCLK should be inverted, the GPIO ChipSelect might
 623	 * be asserted before the SCLK polarity changes, which would disrupt
 624	 * the SPI communication as the device on the other end would consider
 625	 * the change of SCLK polarity as a clock tick already.
 626	 *
 627	 * Because spi_imx->spi_bus_clk is only set in prepare_message
 628	 * callback, iterate over all the transfers in spi_message, find the
 629	 * one with lowest bus frequency, and use that bus frequency for the
 630	 * delay calculation. In case all transfers have speed_hz == 0, then
 631	 * min_speed_hz is ~0 and the resulting delay is zero.
 632	 */
 633	list_for_each_entry(xfer, &msg->transfers, transfer_list) {
 634		if (!xfer->speed_hz)
 635			continue;
 636		min_speed_hz = min(xfer->speed_hz, min_speed_hz);
 637	}
 638
 639	delay = (2 * 1000000) / min_speed_hz;
 640	if (likely(delay < 10))	/* SCLK is faster than 200 kHz */
 641		udelay(delay);
 642	else			/* SCLK is _very_ slow */
 643		usleep_range(delay, delay + 10);
 644
 645	return 0;
 646}
 647
 648static void mx51_configure_cpha(struct spi_imx_data *spi_imx,
 649				struct spi_device *spi)
 650{
 651	bool cpha = (spi->mode & SPI_CPHA);
 652	bool flip_cpha = (spi->mode & SPI_RX_CPHA_FLIP) && spi_imx->rx_only;
 653	u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
 654	int channel = mx51_ecspi_channel(spi);
 655
 656	/* Flip cpha logical value iff flip_cpha */
 657	cpha ^= flip_cpha;
 658
 659	if (cpha)
 660		cfg |= MX51_ECSPI_CONFIG_SCLKPHA(channel);
 661	else
 662		cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(channel);
 663
 664	writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
 665}
 666
 667static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
 668				       struct spi_device *spi, struct spi_transfer *t)
 
 669{
 670	u32 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
 671	u64 word_delay_sck;
 672	u32 clk;
 673
 674	/* Clear BL field and set the right value */
 675	ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
 676	if (spi_imx->target_mode && is_imx53_ecspi(spi_imx))
 677		ctrl |= (spi_imx->target_burst * 8 - 1)
 678			<< MX51_ECSPI_CTRL_BL_OFFSET;
 679	else {
 680		ctrl |= (spi_imx->bits_per_word - 1)
 681			<< MX51_ECSPI_CTRL_BL_OFFSET;
 682	}
 683
 684	/* set clock speed */
 685	ctrl &= ~(0xf << MX51_ECSPI_CTRL_POSTDIV_OFFSET |
 686		  0xf << MX51_ECSPI_CTRL_PREDIV_OFFSET);
 687	ctrl |= mx51_ecspi_clkdiv(spi_imx, spi_imx->spi_bus_clk, &clk);
 688	spi_imx->spi_bus_clk = clk;
 689
 690	mx51_configure_cpha(spi_imx, spi);
 691
 692	/*
 693	 * ERR009165: work in XHC mode instead of SMC as PIO on the chips
 694	 * before i.mx6ul.
 695	 */
 696	if (spi_imx->usedma && spi_imx->devtype_data->tx_glitch_fixed)
 697		ctrl |= MX51_ECSPI_CTRL_SMC;
 698	else
 699		ctrl &= ~MX51_ECSPI_CTRL_SMC;
 700
 701	writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
 702
 703	/* calculate word delay in SPI Clock (SCLK) cycles */
 704	if (t->word_delay.value == 0) {
 705		word_delay_sck = 0;
 706	} else if (t->word_delay.unit == SPI_DELAY_UNIT_SCK) {
 707		word_delay_sck = t->word_delay.value;
 708
 709		if (word_delay_sck <= MX51_ECSPI_PERIOD_MIN_DELAY_SCK)
 710			word_delay_sck = 0;
 711		else if (word_delay_sck <= MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1)
 712			word_delay_sck = 1;
 713		else
 714			word_delay_sck -= MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1;
 715	} else {
 716		int word_delay_ns;
 717
 718		word_delay_ns = spi_delay_to_ns(&t->word_delay, t);
 719		if (word_delay_ns < 0)
 720			return word_delay_ns;
 721
 722		if (word_delay_ns <= mul_u64_u32_div(NSEC_PER_SEC,
 723						     MX51_ECSPI_PERIOD_MIN_DELAY_SCK,
 724						     spi_imx->spi_bus_clk)) {
 725			word_delay_sck = 0;
 726		} else if (word_delay_ns <= mul_u64_u32_div(NSEC_PER_SEC,
 727							    MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1,
 728							    spi_imx->spi_bus_clk)) {
 729			word_delay_sck = 1;
 730		} else {
 731			word_delay_ns -= mul_u64_u32_div(NSEC_PER_SEC,
 732							 MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1,
 733							 spi_imx->spi_bus_clk);
 734
 735			word_delay_sck = DIV_U64_ROUND_UP((u64)word_delay_ns * spi_imx->spi_bus_clk,
 736							  NSEC_PER_SEC);
 737		}
 738	}
 739
 740	if (!FIELD_FIT(MX51_ECSPI_PERIOD_MASK, word_delay_sck))
 741		return -EINVAL;
 742
 743	writel(FIELD_PREP(MX51_ECSPI_PERIOD_MASK, word_delay_sck),
 744	       spi_imx->base + MX51_ECSPI_PERIOD);
 745
 746	return 0;
 747}
 748
 749static void mx51_setup_wml(struct spi_imx_data *spi_imx)
 750{
 751	u32 tx_wml = 0;
 752
 753	if (spi_imx->devtype_data->tx_glitch_fixed)
 754		tx_wml = spi_imx->wml;
 755	/*
 756	 * Configure the DMA register: setup the watermark
 757	 * and enable DMA request.
 758	 */
 759	writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml - 1) |
 760		MX51_ECSPI_DMA_TX_WML(tx_wml) |
 761		MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) |
 762		MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN |
 763		MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);
 764}
 765
 766static int mx51_ecspi_rx_available(struct spi_imx_data *spi_imx)
 767{
 768	return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR;
 769}
 770
 771static void mx51_ecspi_reset(struct spi_imx_data *spi_imx)
 772{
 773	/* drain receive buffer */
 774	while (mx51_ecspi_rx_available(spi_imx))
 775		readl(spi_imx->base + MXC_CSPIRXDATA);
 776}
 777
 778#define MX31_INTREG_TEEN	(1 << 0)
 779#define MX31_INTREG_RREN	(1 << 3)
 780
 781#define MX31_CSPICTRL_ENABLE	(1 << 0)
 782#define MX31_CSPICTRL_HOST	(1 << 1)
 783#define MX31_CSPICTRL_XCH	(1 << 2)
 784#define MX31_CSPICTRL_SMC	(1 << 3)
 785#define MX31_CSPICTRL_POL	(1 << 4)
 786#define MX31_CSPICTRL_PHA	(1 << 5)
 787#define MX31_CSPICTRL_SSCTL	(1 << 6)
 788#define MX31_CSPICTRL_SSPOL	(1 << 7)
 789#define MX31_CSPICTRL_BC_SHIFT	8
 790#define MX35_CSPICTRL_BL_SHIFT	20
 791#define MX31_CSPICTRL_CS_SHIFT	24
 792#define MX35_CSPICTRL_CS_SHIFT	12
 793#define MX31_CSPICTRL_DR_SHIFT	16
 794
 795#define MX31_CSPI_DMAREG	0x10
 796#define MX31_DMAREG_RH_DEN	(1<<4)
 797#define MX31_DMAREG_TH_DEN	(1<<1)
 798
 799#define MX31_CSPISTATUS		0x14
 800#define MX31_STATUS_RR		(1 << 3)
 801
 802#define MX31_CSPI_TESTREG	0x1C
 803#define MX31_TEST_LBC		(1 << 14)
 804
 805/* These functions also work for the i.MX35, but be aware that
 806 * the i.MX35 has a slightly different register layout for bits
 807 * we do not use here.
 808 */
 809static void mx31_intctrl(struct spi_imx_data *spi_imx, int enable)
 810{
 811	unsigned int val = 0;
 812
 813	if (enable & MXC_INT_TE)
 814		val |= MX31_INTREG_TEEN;
 815	if (enable & MXC_INT_RR)
 816		val |= MX31_INTREG_RREN;
 817
 818	writel(val, spi_imx->base + MXC_CSPIINT);
 819}
 820
 821static void mx31_trigger(struct spi_imx_data *spi_imx)
 822{
 823	unsigned int reg;
 824
 825	reg = readl(spi_imx->base + MXC_CSPICTRL);
 826	reg |= MX31_CSPICTRL_XCH;
 827	writel(reg, spi_imx->base + MXC_CSPICTRL);
 828}
 829
 830static int mx31_prepare_message(struct spi_imx_data *spi_imx,
 831				struct spi_message *msg)
 832{
 833	return 0;
 834}
 835
 836static int mx31_prepare_transfer(struct spi_imx_data *spi_imx,
 837				 struct spi_device *spi, struct spi_transfer *t)
 
 838{
 839	unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_HOST;
 840	unsigned int clk;
 841
 842	reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->spi_bus_clk, &clk) <<
 843		MX31_CSPICTRL_DR_SHIFT;
 844	spi_imx->spi_bus_clk = clk;
 845
 846	if (is_imx35_cspi(spi_imx)) {
 847		reg |= (spi_imx->bits_per_word - 1) << MX35_CSPICTRL_BL_SHIFT;
 848		reg |= MX31_CSPICTRL_SSCTL;
 849	} else {
 850		reg |= (spi_imx->bits_per_word - 1) << MX31_CSPICTRL_BC_SHIFT;
 851	}
 852
 853	if (spi->mode & SPI_CPHA)
 854		reg |= MX31_CSPICTRL_PHA;
 855	if (spi->mode & SPI_CPOL)
 856		reg |= MX31_CSPICTRL_POL;
 857	if (spi->mode & SPI_CS_HIGH)
 858		reg |= MX31_CSPICTRL_SSPOL;
 859	if (!spi_get_csgpiod(spi, 0))
 860		reg |= (spi_get_chipselect(spi, 0)) <<
 861			(is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT :
 862						  MX31_CSPICTRL_CS_SHIFT);
 863
 864	if (spi_imx->usedma)
 865		reg |= MX31_CSPICTRL_SMC;
 866
 867	writel(reg, spi_imx->base + MXC_CSPICTRL);
 868
 869	reg = readl(spi_imx->base + MX31_CSPI_TESTREG);
 870	if (spi->mode & SPI_LOOP)
 871		reg |= MX31_TEST_LBC;
 872	else
 873		reg &= ~MX31_TEST_LBC;
 874	writel(reg, spi_imx->base + MX31_CSPI_TESTREG);
 875
 876	if (spi_imx->usedma) {
 877		/*
 878		 * configure DMA requests when RXFIFO is half full and
 879		 * when TXFIFO is half empty
 880		 */
 881		writel(MX31_DMAREG_RH_DEN | MX31_DMAREG_TH_DEN,
 882			spi_imx->base + MX31_CSPI_DMAREG);
 883	}
 884
 885	return 0;
 886}
 887
 888static int mx31_rx_available(struct spi_imx_data *spi_imx)
 889{
 890	return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR;
 891}
 892
 893static void mx31_reset(struct spi_imx_data *spi_imx)
 894{
 895	/* drain receive buffer */
 896	while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR)
 897		readl(spi_imx->base + MXC_CSPIRXDATA);
 898}
 899
 900#define MX21_INTREG_RR		(1 << 4)
 901#define MX21_INTREG_TEEN	(1 << 9)
 902#define MX21_INTREG_RREN	(1 << 13)
 903
 904#define MX21_CSPICTRL_POL	(1 << 5)
 905#define MX21_CSPICTRL_PHA	(1 << 6)
 906#define MX21_CSPICTRL_SSPOL	(1 << 8)
 907#define MX21_CSPICTRL_XCH	(1 << 9)
 908#define MX21_CSPICTRL_ENABLE	(1 << 10)
 909#define MX21_CSPICTRL_HOST	(1 << 11)
 910#define MX21_CSPICTRL_DR_SHIFT	14
 911#define MX21_CSPICTRL_CS_SHIFT	19
 912
 913static void mx21_intctrl(struct spi_imx_data *spi_imx, int enable)
 914{
 915	unsigned int val = 0;
 916
 917	if (enable & MXC_INT_TE)
 918		val |= MX21_INTREG_TEEN;
 919	if (enable & MXC_INT_RR)
 920		val |= MX21_INTREG_RREN;
 921
 922	writel(val, spi_imx->base + MXC_CSPIINT);
 923}
 924
 925static void mx21_trigger(struct spi_imx_data *spi_imx)
 926{
 927	unsigned int reg;
 928
 929	reg = readl(spi_imx->base + MXC_CSPICTRL);
 930	reg |= MX21_CSPICTRL_XCH;
 931	writel(reg, spi_imx->base + MXC_CSPICTRL);
 932}
 933
 934static int mx21_prepare_message(struct spi_imx_data *spi_imx,
 935				struct spi_message *msg)
 936{
 937	return 0;
 938}
 939
 940static int mx21_prepare_transfer(struct spi_imx_data *spi_imx,
 941				 struct spi_device *spi, struct spi_transfer *t)
 
 942{
 943	unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_HOST;
 944	unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
 945	unsigned int clk;
 946
 947	reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, spi_imx->spi_bus_clk, max, &clk)
 948		<< MX21_CSPICTRL_DR_SHIFT;
 949	spi_imx->spi_bus_clk = clk;
 950
 951	reg |= spi_imx->bits_per_word - 1;
 952
 953	if (spi->mode & SPI_CPHA)
 954		reg |= MX21_CSPICTRL_PHA;
 955	if (spi->mode & SPI_CPOL)
 956		reg |= MX21_CSPICTRL_POL;
 957	if (spi->mode & SPI_CS_HIGH)
 958		reg |= MX21_CSPICTRL_SSPOL;
 959	if (!spi_get_csgpiod(spi, 0))
 960		reg |= spi_get_chipselect(spi, 0) << MX21_CSPICTRL_CS_SHIFT;
 961
 962	writel(reg, spi_imx->base + MXC_CSPICTRL);
 963
 964	return 0;
 965}
 966
 967static int mx21_rx_available(struct spi_imx_data *spi_imx)
 968{
 969	return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR;
 970}
 971
 972static void mx21_reset(struct spi_imx_data *spi_imx)
 973{
 974	writel(1, spi_imx->base + MXC_RESET);
 975}
 976
 977#define MX1_INTREG_RR		(1 << 3)
 978#define MX1_INTREG_TEEN		(1 << 8)
 979#define MX1_INTREG_RREN		(1 << 11)
 980
 981#define MX1_CSPICTRL_POL	(1 << 4)
 982#define MX1_CSPICTRL_PHA	(1 << 5)
 983#define MX1_CSPICTRL_XCH	(1 << 8)
 984#define MX1_CSPICTRL_ENABLE	(1 << 9)
 985#define MX1_CSPICTRL_HOST	(1 << 10)
 986#define MX1_CSPICTRL_DR_SHIFT	13
 987
 988static void mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
 989{
 990	unsigned int val = 0;
 991
 992	if (enable & MXC_INT_TE)
 993		val |= MX1_INTREG_TEEN;
 994	if (enable & MXC_INT_RR)
 995		val |= MX1_INTREG_RREN;
 996
 997	writel(val, spi_imx->base + MXC_CSPIINT);
 998}
 999
1000static void mx1_trigger(struct spi_imx_data *spi_imx)
1001{
1002	unsigned int reg;
1003
1004	reg = readl(spi_imx->base + MXC_CSPICTRL);
1005	reg |= MX1_CSPICTRL_XCH;
1006	writel(reg, spi_imx->base + MXC_CSPICTRL);
1007}
1008
1009static int mx1_prepare_message(struct spi_imx_data *spi_imx,
1010			       struct spi_message *msg)
1011{
1012	return 0;
1013}
1014
1015static int mx1_prepare_transfer(struct spi_imx_data *spi_imx,
1016				struct spi_device *spi, struct spi_transfer *t)
 
1017{
1018	unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_HOST;
1019	unsigned int clk;
1020
1021	reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->spi_bus_clk, &clk) <<
1022		MX1_CSPICTRL_DR_SHIFT;
1023	spi_imx->spi_bus_clk = clk;
1024
1025	reg |= spi_imx->bits_per_word - 1;
1026
1027	if (spi->mode & SPI_CPHA)
1028		reg |= MX1_CSPICTRL_PHA;
1029	if (spi->mode & SPI_CPOL)
1030		reg |= MX1_CSPICTRL_POL;
1031
1032	writel(reg, spi_imx->base + MXC_CSPICTRL);
1033
1034	return 0;
1035}
1036
1037static int mx1_rx_available(struct spi_imx_data *spi_imx)
1038{
1039	return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR;
1040}
1041
1042static void mx1_reset(struct spi_imx_data *spi_imx)
1043{
1044	writel(1, spi_imx->base + MXC_RESET);
1045}
1046
1047static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
1048	.intctrl = mx1_intctrl,
1049	.prepare_message = mx1_prepare_message,
1050	.prepare_transfer = mx1_prepare_transfer,
1051	.trigger = mx1_trigger,
1052	.rx_available = mx1_rx_available,
1053	.reset = mx1_reset,
1054	.fifo_size = 8,
1055	.has_dmamode = false,
1056	.dynamic_burst = false,
1057	.has_targetmode = false,
1058	.devtype = IMX1_CSPI,
1059};
1060
1061static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
1062	.intctrl = mx21_intctrl,
1063	.prepare_message = mx21_prepare_message,
1064	.prepare_transfer = mx21_prepare_transfer,
1065	.trigger = mx21_trigger,
1066	.rx_available = mx21_rx_available,
1067	.reset = mx21_reset,
1068	.fifo_size = 8,
1069	.has_dmamode = false,
1070	.dynamic_burst = false,
1071	.has_targetmode = false,
1072	.devtype = IMX21_CSPI,
1073};
1074
1075static struct spi_imx_devtype_data imx27_cspi_devtype_data = {
1076	/* i.mx27 cspi shares the functions with i.mx21 one */
1077	.intctrl = mx21_intctrl,
1078	.prepare_message = mx21_prepare_message,
1079	.prepare_transfer = mx21_prepare_transfer,
1080	.trigger = mx21_trigger,
1081	.rx_available = mx21_rx_available,
1082	.reset = mx21_reset,
1083	.fifo_size = 8,
1084	.has_dmamode = false,
1085	.dynamic_burst = false,
1086	.has_targetmode = false,
1087	.devtype = IMX27_CSPI,
1088};
1089
1090static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
1091	.intctrl = mx31_intctrl,
1092	.prepare_message = mx31_prepare_message,
1093	.prepare_transfer = mx31_prepare_transfer,
1094	.trigger = mx31_trigger,
1095	.rx_available = mx31_rx_available,
1096	.reset = mx31_reset,
1097	.fifo_size = 8,
1098	.has_dmamode = false,
1099	.dynamic_burst = false,
1100	.has_targetmode = false,
1101	.devtype = IMX31_CSPI,
1102};
1103
1104static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
1105	/* i.mx35 and later cspi shares the functions with i.mx31 one */
1106	.intctrl = mx31_intctrl,
1107	.prepare_message = mx31_prepare_message,
1108	.prepare_transfer = mx31_prepare_transfer,
1109	.trigger = mx31_trigger,
1110	.rx_available = mx31_rx_available,
1111	.reset = mx31_reset,
1112	.fifo_size = 8,
1113	.has_dmamode = false,
1114	.dynamic_burst = false,
1115	.has_targetmode = false,
1116	.devtype = IMX35_CSPI,
1117};
1118
1119static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
1120	.intctrl = mx51_ecspi_intctrl,
1121	.prepare_message = mx51_ecspi_prepare_message,
1122	.prepare_transfer = mx51_ecspi_prepare_transfer,
1123	.trigger = mx51_ecspi_trigger,
1124	.rx_available = mx51_ecspi_rx_available,
1125	.reset = mx51_ecspi_reset,
1126	.setup_wml = mx51_setup_wml,
1127	.fifo_size = 64,
1128	.has_dmamode = true,
1129	.dynamic_burst = true,
1130	.has_targetmode = true,
1131	.disable = mx51_ecspi_disable,
1132	.devtype = IMX51_ECSPI,
1133};
1134
1135static struct spi_imx_devtype_data imx53_ecspi_devtype_data = {
1136	.intctrl = mx51_ecspi_intctrl,
1137	.prepare_message = mx51_ecspi_prepare_message,
1138	.prepare_transfer = mx51_ecspi_prepare_transfer,
1139	.trigger = mx51_ecspi_trigger,
1140	.rx_available = mx51_ecspi_rx_available,
1141	.reset = mx51_ecspi_reset,
1142	.fifo_size = 64,
1143	.has_dmamode = true,
1144	.has_targetmode = true,
1145	.disable = mx51_ecspi_disable,
1146	.devtype = IMX53_ECSPI,
1147};
1148
1149static struct spi_imx_devtype_data imx6ul_ecspi_devtype_data = {
1150	.intctrl = mx51_ecspi_intctrl,
1151	.prepare_message = mx51_ecspi_prepare_message,
1152	.prepare_transfer = mx51_ecspi_prepare_transfer,
1153	.trigger = mx51_ecspi_trigger,
1154	.rx_available = mx51_ecspi_rx_available,
1155	.reset = mx51_ecspi_reset,
1156	.setup_wml = mx51_setup_wml,
1157	.fifo_size = 64,
1158	.has_dmamode = true,
1159	.dynamic_burst = true,
1160	.has_targetmode = true,
1161	.tx_glitch_fixed = true,
1162	.disable = mx51_ecspi_disable,
1163	.devtype = IMX51_ECSPI,
 
 
 
 
 
 
 
 
 
 
1164};
1165
1166static const struct of_device_id spi_imx_dt_ids[] = {
1167	{ .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
1168	{ .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
1169	{ .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
1170	{ .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
1171	{ .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
1172	{ .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
1173	{ .compatible = "fsl,imx53-ecspi", .data = &imx53_ecspi_devtype_data, },
1174	{ .compatible = "fsl,imx6ul-ecspi", .data = &imx6ul_ecspi_devtype_data, },
1175	{ /* sentinel */ }
1176};
1177MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);
1178
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1179static void spi_imx_set_burst_len(struct spi_imx_data *spi_imx, int n_bits)
1180{
1181	u32 ctrl;
1182
1183	ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
1184	ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
1185	ctrl |= ((n_bits - 1) << MX51_ECSPI_CTRL_BL_OFFSET);
1186	writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
1187}
1188
1189static void spi_imx_push(struct spi_imx_data *spi_imx)
1190{
1191	unsigned int burst_len;
1192
 
 
 
 
1193	/*
1194	 * Reload the FIFO when the remaining bytes to be transferred in the
1195	 * current burst is 0. This only applies when bits_per_word is a
1196	 * multiple of 8.
1197	 */
1198	if (!spi_imx->remainder) {
1199		if (spi_imx->dynamic_burst) {
1200
1201			/* We need to deal unaligned data first */
1202			burst_len = spi_imx->count % MX51_ECSPI_CTRL_MAX_BURST;
1203
1204			if (!burst_len)
1205				burst_len = MX51_ECSPI_CTRL_MAX_BURST;
1206
1207			spi_imx_set_burst_len(spi_imx, burst_len * 8);
1208
1209			spi_imx->remainder = burst_len;
1210		} else {
1211			spi_imx->remainder = spi_imx_bytes_per_word(spi_imx->bits_per_word);
1212		}
1213	}
1214
1215	while (spi_imx->txfifo < spi_imx->devtype_data->fifo_size) {
1216		if (!spi_imx->count)
1217			break;
1218		if (spi_imx->dynamic_burst &&
1219		    spi_imx->txfifo >= DIV_ROUND_UP(spi_imx->remainder, 4))
 
1220			break;
1221		spi_imx->tx(spi_imx);
1222		spi_imx->txfifo++;
1223	}
1224
1225	if (!spi_imx->target_mode)
1226		spi_imx->devtype_data->trigger(spi_imx);
1227}
1228
1229static irqreturn_t spi_imx_isr(int irq, void *dev_id)
1230{
1231	struct spi_imx_data *spi_imx = dev_id;
1232
1233	while (spi_imx->txfifo &&
1234	       spi_imx->devtype_data->rx_available(spi_imx)) {
1235		spi_imx->rx(spi_imx);
1236		spi_imx->txfifo--;
1237	}
1238
1239	if (spi_imx->count) {
1240		spi_imx_push(spi_imx);
1241		return IRQ_HANDLED;
1242	}
1243
1244	if (spi_imx->txfifo) {
1245		/* No data left to push, but still waiting for rx data,
1246		 * enable receive data available interrupt.
1247		 */
1248		spi_imx->devtype_data->intctrl(
1249				spi_imx, MXC_INT_RR);
1250		return IRQ_HANDLED;
1251	}
1252
1253	spi_imx->devtype_data->intctrl(spi_imx, 0);
1254	complete(&spi_imx->xfer_done);
1255
1256	return IRQ_HANDLED;
1257}
1258
1259static int spi_imx_dma_configure(struct spi_controller *controller)
1260{
1261	int ret;
1262	enum dma_slave_buswidth buswidth;
1263	struct dma_slave_config rx = {}, tx = {};
1264	struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1265
1266	switch (spi_imx_bytes_per_word(spi_imx->bits_per_word)) {
1267	case 4:
1268		buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
1269		break;
1270	case 2:
1271		buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
1272		break;
1273	case 1:
1274		buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
1275		break;
1276	default:
1277		return -EINVAL;
1278	}
1279
1280	tx.direction = DMA_MEM_TO_DEV;
1281	tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA;
1282	tx.dst_addr_width = buswidth;
1283	tx.dst_maxburst = spi_imx->wml;
1284	ret = dmaengine_slave_config(controller->dma_tx, &tx);
1285	if (ret) {
1286		dev_err(spi_imx->dev, "TX dma configuration failed with %d\n", ret);
1287		return ret;
1288	}
1289
1290	rx.direction = DMA_DEV_TO_MEM;
1291	rx.src_addr = spi_imx->base_phys + MXC_CSPIRXDATA;
1292	rx.src_addr_width = buswidth;
1293	rx.src_maxburst = spi_imx->wml;
1294	ret = dmaengine_slave_config(controller->dma_rx, &rx);
1295	if (ret) {
1296		dev_err(spi_imx->dev, "RX dma configuration failed with %d\n", ret);
1297		return ret;
1298	}
1299
1300	return 0;
1301}
1302
1303static int spi_imx_setupxfer(struct spi_device *spi,
1304				 struct spi_transfer *t)
1305{
1306	struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1307
1308	if (!t)
1309		return 0;
1310
1311	if (!t->speed_hz) {
1312		if (!spi->max_speed_hz) {
1313			dev_err(&spi->dev, "no speed_hz provided!\n");
1314			return -EINVAL;
1315		}
1316		dev_dbg(&spi->dev, "using spi->max_speed_hz!\n");
1317		spi_imx->spi_bus_clk = spi->max_speed_hz;
1318	} else
1319		spi_imx->spi_bus_clk = t->speed_hz;
1320
1321	spi_imx->bits_per_word = t->bits_per_word;
1322	spi_imx->count = t->len;
1323
1324	/*
1325	 * Initialize the functions for transfer. To transfer non byte-aligned
1326	 * words, we have to use multiple word-size bursts. To insert word
1327	 * delay, the burst size has to equal the word size. We can't use
1328	 * dynamic_burst in these cases.
1329	 */
1330	if (spi_imx->devtype_data->dynamic_burst && !spi_imx->target_mode &&
1331	    !(spi->mode & SPI_CS_WORD) &&
1332	    !(t->word_delay.value) &&
1333	    (spi_imx->bits_per_word == 8 ||
1334	    spi_imx->bits_per_word == 16 ||
1335	    spi_imx->bits_per_word == 32)) {
1336
1337		spi_imx->rx = spi_imx_buf_rx_swap;
1338		spi_imx->tx = spi_imx_buf_tx_swap;
1339		spi_imx->dynamic_burst = 1;
1340
1341	} else {
1342		if (spi_imx->bits_per_word <= 8) {
1343			spi_imx->rx = spi_imx_buf_rx_u8;
1344			spi_imx->tx = spi_imx_buf_tx_u8;
1345		} else if (spi_imx->bits_per_word <= 16) {
1346			spi_imx->rx = spi_imx_buf_rx_u16;
1347			spi_imx->tx = spi_imx_buf_tx_u16;
1348		} else {
1349			spi_imx->rx = spi_imx_buf_rx_u32;
1350			spi_imx->tx = spi_imx_buf_tx_u32;
1351		}
1352		spi_imx->dynamic_burst = 0;
1353	}
1354
1355	if (spi_imx_can_dma(spi_imx->controller, spi, t))
1356		spi_imx->usedma = true;
1357	else
1358		spi_imx->usedma = false;
1359
1360	spi_imx->rx_only = ((t->tx_buf == NULL)
1361			|| (t->tx_buf == spi->controller->dummy_tx));
1362
1363	if (is_imx53_ecspi(spi_imx) && spi_imx->target_mode) {
1364		spi_imx->rx = mx53_ecspi_rx_target;
1365		spi_imx->tx = mx53_ecspi_tx_target;
1366		spi_imx->target_burst = t->len;
1367	}
1368
1369	spi_imx->devtype_data->prepare_transfer(spi_imx, spi, t);
1370
1371	return 0;
1372}
1373
1374static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
1375{
1376	struct spi_controller *controller = spi_imx->controller;
1377
1378	if (controller->dma_rx) {
1379		dma_release_channel(controller->dma_rx);
1380		controller->dma_rx = NULL;
1381	}
1382
1383	if (controller->dma_tx) {
1384		dma_release_channel(controller->dma_tx);
1385		controller->dma_tx = NULL;
1386	}
1387}
1388
1389static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
1390			     struct spi_controller *controller)
1391{
1392	int ret;
1393
 
 
 
 
1394	spi_imx->wml = spi_imx->devtype_data->fifo_size / 2;
1395
1396	/* Prepare for TX DMA: */
1397	controller->dma_tx = dma_request_chan(dev, "tx");
1398	if (IS_ERR(controller->dma_tx)) {
1399		ret = PTR_ERR(controller->dma_tx);
1400		dev_err_probe(dev, ret, "can't get the TX DMA channel!\n");
1401		controller->dma_tx = NULL;
1402		goto err;
1403	}
1404
1405	/* Prepare for RX : */
1406	controller->dma_rx = dma_request_chan(dev, "rx");
1407	if (IS_ERR(controller->dma_rx)) {
1408		ret = PTR_ERR(controller->dma_rx);
1409		dev_err_probe(dev, ret, "can't get the RX DMA channel!\n");
1410		controller->dma_rx = NULL;
1411		goto err;
1412	}
1413
1414	init_completion(&spi_imx->dma_rx_completion);
1415	init_completion(&spi_imx->dma_tx_completion);
1416	controller->can_dma = spi_imx_can_dma;
1417	controller->max_dma_len = MAX_SDMA_BD_BYTES;
1418	spi_imx->controller->flags = SPI_CONTROLLER_MUST_RX |
1419					 SPI_CONTROLLER_MUST_TX;
1420
1421	return 0;
1422err:
1423	spi_imx_sdma_exit(spi_imx);
1424	return ret;
1425}
1426
1427static void spi_imx_dma_rx_callback(void *cookie)
1428{
1429	struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
1430
1431	complete(&spi_imx->dma_rx_completion);
1432}
1433
1434static void spi_imx_dma_tx_callback(void *cookie)
1435{
1436	struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
1437
1438	complete(&spi_imx->dma_tx_completion);
1439}
1440
1441static int spi_imx_calculate_timeout(struct spi_imx_data *spi_imx, int size)
1442{
1443	unsigned long timeout = 0;
1444
1445	/* Time with actual data transfer and CS change delay related to HW */
1446	timeout = (8 + 4) * size / spi_imx->spi_bus_clk;
1447
1448	/* Add extra second for scheduler related activities */
1449	timeout += 1;
1450
1451	/* Double calculated timeout */
1452	return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC);
1453}
1454
1455static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
1456				struct spi_transfer *transfer)
1457{
1458	struct dma_async_tx_descriptor *desc_tx, *desc_rx;
1459	unsigned long transfer_timeout;
1460	unsigned long time_left;
1461	struct spi_controller *controller = spi_imx->controller;
1462	struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
1463	struct scatterlist *last_sg = sg_last(rx->sgl, rx->nents);
1464	unsigned int bytes_per_word, i;
1465	int ret;
1466
1467	/* Get the right burst length from the last sg to ensure no tail data */
1468	bytes_per_word = spi_imx_bytes_per_word(transfer->bits_per_word);
1469	for (i = spi_imx->devtype_data->fifo_size / 2; i > 0; i--) {
1470		if (!(sg_dma_len(last_sg) % (i * bytes_per_word)))
1471			break;
1472	}
1473	/* Use 1 as wml in case no available burst length got */
1474	if (i == 0)
1475		i = 1;
1476
1477	spi_imx->wml =  i;
1478
1479	ret = spi_imx_dma_configure(controller);
1480	if (ret)
1481		goto dma_failure_no_start;
1482
1483	if (!spi_imx->devtype_data->setup_wml) {
1484		dev_err(spi_imx->dev, "No setup_wml()?\n");
1485		ret = -EINVAL;
1486		goto dma_failure_no_start;
1487	}
1488	spi_imx->devtype_data->setup_wml(spi_imx);
1489
1490	/*
1491	 * The TX DMA setup starts the transfer, so make sure RX is configured
1492	 * before TX.
1493	 */
1494	desc_rx = dmaengine_prep_slave_sg(controller->dma_rx,
1495				rx->sgl, rx->nents, DMA_DEV_TO_MEM,
1496				DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1497	if (!desc_rx) {
1498		ret = -EINVAL;
1499		goto dma_failure_no_start;
1500	}
1501
1502	desc_rx->callback = spi_imx_dma_rx_callback;
1503	desc_rx->callback_param = (void *)spi_imx;
1504	dmaengine_submit(desc_rx);
1505	reinit_completion(&spi_imx->dma_rx_completion);
1506	dma_async_issue_pending(controller->dma_rx);
1507
1508	desc_tx = dmaengine_prep_slave_sg(controller->dma_tx,
1509				tx->sgl, tx->nents, DMA_MEM_TO_DEV,
1510				DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1511	if (!desc_tx) {
1512		dmaengine_terminate_all(controller->dma_tx);
1513		dmaengine_terminate_all(controller->dma_rx);
1514		return -EINVAL;
1515	}
1516
1517	desc_tx->callback = spi_imx_dma_tx_callback;
1518	desc_tx->callback_param = (void *)spi_imx;
1519	dmaengine_submit(desc_tx);
1520	reinit_completion(&spi_imx->dma_tx_completion);
1521	dma_async_issue_pending(controller->dma_tx);
1522
1523	transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1524
1525	/* Wait SDMA to finish the data transfer.*/
1526	time_left = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
1527						transfer_timeout);
1528	if (!time_left) {
1529		dev_err(spi_imx->dev, "I/O Error in DMA TX\n");
1530		dmaengine_terminate_all(controller->dma_tx);
1531		dmaengine_terminate_all(controller->dma_rx);
1532		return -ETIMEDOUT;
1533	}
1534
1535	time_left = wait_for_completion_timeout(&spi_imx->dma_rx_completion,
1536						transfer_timeout);
1537	if (!time_left) {
1538		dev_err(&controller->dev, "I/O Error in DMA RX\n");
1539		spi_imx->devtype_data->reset(spi_imx);
1540		dmaengine_terminate_all(controller->dma_rx);
1541		return -ETIMEDOUT;
1542	}
1543
1544	return 0;
1545/* fallback to pio */
1546dma_failure_no_start:
1547	transfer->error |= SPI_TRANS_FAIL_NO_START;
1548	return ret;
1549}
1550
1551static int spi_imx_pio_transfer(struct spi_device *spi,
1552				struct spi_transfer *transfer)
1553{
1554	struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1555	unsigned long transfer_timeout;
1556	unsigned long time_left;
1557
1558	spi_imx->tx_buf = transfer->tx_buf;
1559	spi_imx->rx_buf = transfer->rx_buf;
1560	spi_imx->count = transfer->len;
1561	spi_imx->txfifo = 0;
1562	spi_imx->remainder = 0;
1563
1564	reinit_completion(&spi_imx->xfer_done);
1565
1566	spi_imx_push(spi_imx);
1567
1568	spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE);
1569
1570	transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1571
1572	time_left = wait_for_completion_timeout(&spi_imx->xfer_done,
1573						transfer_timeout);
1574	if (!time_left) {
1575		dev_err(&spi->dev, "I/O Error in PIO\n");
1576		spi_imx->devtype_data->reset(spi_imx);
1577		return -ETIMEDOUT;
1578	}
1579
1580	return 0;
1581}
1582
1583static int spi_imx_poll_transfer(struct spi_device *spi,
1584				 struct spi_transfer *transfer)
1585{
1586	struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1587	unsigned long timeout;
1588
1589	spi_imx->tx_buf = transfer->tx_buf;
1590	spi_imx->rx_buf = transfer->rx_buf;
1591	spi_imx->count = transfer->len;
1592	spi_imx->txfifo = 0;
1593	spi_imx->remainder = 0;
1594
1595	/* fill in the fifo before timeout calculations if we are
1596	 * interrupted here, then the data is getting transferred by
1597	 * the HW while we are interrupted
1598	 */
1599	spi_imx_push(spi_imx);
1600
1601	timeout = spi_imx_calculate_timeout(spi_imx, transfer->len) + jiffies;
1602	while (spi_imx->txfifo) {
1603		/* RX */
1604		while (spi_imx->txfifo &&
1605		       spi_imx->devtype_data->rx_available(spi_imx)) {
1606			spi_imx->rx(spi_imx);
1607			spi_imx->txfifo--;
1608		}
1609
1610		/* TX */
1611		if (spi_imx->count) {
1612			spi_imx_push(spi_imx);
1613			continue;
1614		}
1615
1616		if (spi_imx->txfifo &&
1617		    time_after(jiffies, timeout)) {
1618
1619			dev_err_ratelimited(&spi->dev,
1620					    "timeout period reached: jiffies: %lu- falling back to interrupt mode\n",
1621					    jiffies - timeout);
1622
1623			/* fall back to interrupt mode */
1624			return spi_imx_pio_transfer(spi, transfer);
1625		}
1626	}
1627
1628	return 0;
1629}
1630
1631static int spi_imx_pio_transfer_target(struct spi_device *spi,
1632				       struct spi_transfer *transfer)
1633{
1634	struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1635	int ret = 0;
1636
1637	if (is_imx53_ecspi(spi_imx) &&
1638	    transfer->len > MX53_MAX_TRANSFER_BYTES) {
1639		dev_err(&spi->dev, "Transaction too big, max size is %d bytes\n",
1640			MX53_MAX_TRANSFER_BYTES);
1641		return -EMSGSIZE;
1642	}
1643
1644	spi_imx->tx_buf = transfer->tx_buf;
1645	spi_imx->rx_buf = transfer->rx_buf;
1646	spi_imx->count = transfer->len;
1647	spi_imx->txfifo = 0;
1648	spi_imx->remainder = 0;
1649
1650	reinit_completion(&spi_imx->xfer_done);
1651	spi_imx->target_aborted = false;
1652
1653	spi_imx_push(spi_imx);
1654
1655	spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE | MXC_INT_RDR);
1656
1657	if (wait_for_completion_interruptible(&spi_imx->xfer_done) ||
1658	    spi_imx->target_aborted) {
1659		dev_dbg(&spi->dev, "interrupted\n");
1660		ret = -EINTR;
1661	}
1662
1663	/* ecspi has a HW issue when works in Target mode,
1664	 * after 64 words writtern to TXFIFO, even TXFIFO becomes empty,
1665	 * ECSPI_TXDATA keeps shift out the last word data,
1666	 * so we have to disable ECSPI when in target mode after the
1667	 * transfer completes
1668	 */
1669	if (spi_imx->devtype_data->disable)
1670		spi_imx->devtype_data->disable(spi_imx);
1671
1672	return ret;
1673}
1674
1675static unsigned int spi_imx_transfer_estimate_time_us(struct spi_transfer *transfer)
1676{
1677	u64 result;
1678
1679	result = DIV_U64_ROUND_CLOSEST((u64)USEC_PER_SEC * transfer->len * BITS_PER_BYTE,
1680				       transfer->effective_speed_hz);
1681	if (transfer->word_delay.value) {
1682		unsigned int word_delay_us;
1683		unsigned int words;
1684
1685		words = DIV_ROUND_UP(transfer->len * BITS_PER_BYTE, transfer->bits_per_word);
1686		word_delay_us = DIV_ROUND_CLOSEST(spi_delay_to_ns(&transfer->word_delay, transfer),
1687						  NSEC_PER_USEC);
1688		result += (u64)words * word_delay_us;
1689	}
1690
1691	return min(result, U32_MAX);
1692}
1693
1694static int spi_imx_transfer_one(struct spi_controller *controller,
1695				struct spi_device *spi,
1696				struct spi_transfer *transfer)
1697{
1698	struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
1699
1700	spi_imx_setupxfer(spi, transfer);
1701	transfer->effective_speed_hz = spi_imx->spi_bus_clk;
1702
1703	/* flush rxfifo before transfer */
1704	while (spi_imx->devtype_data->rx_available(spi_imx))
1705		readl(spi_imx->base + MXC_CSPIRXDATA);
1706
1707	if (spi_imx->target_mode)
1708		return spi_imx_pio_transfer_target(spi, transfer);
1709
1710	/*
1711	 * If we decided in spi_imx_can_dma() that we want to do a DMA
1712	 * transfer, the SPI transfer has already been mapped, so we
1713	 * have to do the DMA transfer here.
1714	 */
1715	if (spi_imx->usedma)
1716		return spi_imx_dma_transfer(spi_imx, transfer);
1717
1718	/* run in polling mode for short transfers */
1719	if (transfer->len == 1 || (polling_limit_us &&
1720				   spi_imx_transfer_estimate_time_us(transfer) < polling_limit_us))
1721		return spi_imx_poll_transfer(spi, transfer);
1722
1723	return spi_imx_pio_transfer(spi, transfer);
1724}
1725
1726static int spi_imx_setup(struct spi_device *spi)
1727{
1728	dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__,
1729		 spi->mode, spi->bits_per_word, spi->max_speed_hz);
1730
 
 
 
 
 
 
 
 
 
1731	return 0;
1732}
1733
 
 
 
 
1734static int
1735spi_imx_prepare_message(struct spi_controller *controller, struct spi_message *msg)
1736{
1737	struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1738	int ret;
1739
1740	ret = pm_runtime_resume_and_get(spi_imx->dev);
1741	if (ret < 0) {
1742		dev_err(spi_imx->dev, "failed to enable clock\n");
 
 
 
 
1743		return ret;
1744	}
1745
1746	ret = spi_imx->devtype_data->prepare_message(spi_imx, msg);
1747	if (ret) {
1748		pm_runtime_mark_last_busy(spi_imx->dev);
1749		pm_runtime_put_autosuspend(spi_imx->dev);
1750	}
1751
1752	return ret;
1753}
1754
1755static int
1756spi_imx_unprepare_message(struct spi_controller *controller, struct spi_message *msg)
1757{
1758	struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1759
1760	pm_runtime_mark_last_busy(spi_imx->dev);
1761	pm_runtime_put_autosuspend(spi_imx->dev);
1762	return 0;
1763}
1764
1765static int spi_imx_target_abort(struct spi_controller *controller)
1766{
1767	struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1768
1769	spi_imx->target_aborted = true;
1770	complete(&spi_imx->xfer_done);
1771
1772	return 0;
1773}
1774
1775static int spi_imx_probe(struct platform_device *pdev)
1776{
1777	struct device_node *np = pdev->dev.of_node;
1778	struct spi_controller *controller;
 
 
 
 
1779	struct spi_imx_data *spi_imx;
1780	struct resource *res;
1781	int ret, irq, spi_drctl;
1782	const struct spi_imx_devtype_data *devtype_data =
1783			of_device_get_match_data(&pdev->dev);
1784	bool target_mode;
1785	u32 val;
 
 
 
 
1786
1787	target_mode = devtype_data->has_targetmode &&
1788		      of_property_read_bool(np, "spi-slave");
1789	if (target_mode)
1790		controller = spi_alloc_target(&pdev->dev,
1791					      sizeof(struct spi_imx_data));
1792	else
1793		controller = spi_alloc_host(&pdev->dev,
1794					    sizeof(struct spi_imx_data));
1795	if (!controller)
1796		return -ENOMEM;
1797
1798	ret = of_property_read_u32(np, "fsl,spi-rdy-drctl", &spi_drctl);
1799	if ((ret < 0) || (spi_drctl >= 0x3)) {
1800		/* '11' is reserved */
1801		spi_drctl = 0;
1802	}
1803
1804	platform_set_drvdata(pdev, controller);
1805
1806	controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
1807	controller->bus_num = np ? -1 : pdev->id;
1808	controller->use_gpio_descriptors = true;
1809
1810	spi_imx = spi_controller_get_devdata(controller);
1811	spi_imx->controller = controller;
1812	spi_imx->dev = &pdev->dev;
1813	spi_imx->target_mode = target_mode;
1814
1815	spi_imx->devtype_data = devtype_data;
1816
1817	/*
1818	 * Get number of chip selects from device properties. This can be
1819	 * coming from device tree or boardfiles, if it is not defined,
1820	 * a default value of 3 chip selects will be used, as all the legacy
1821	 * board files have <= 3 chip selects.
1822	 */
1823	if (!device_property_read_u32(&pdev->dev, "num-cs", &val))
1824		controller->num_chipselect = val;
1825	else
1826		controller->num_chipselect = 3;
1827
1828	controller->transfer_one = spi_imx_transfer_one;
1829	controller->setup = spi_imx_setup;
1830	controller->prepare_message = spi_imx_prepare_message;
1831	controller->unprepare_message = spi_imx_unprepare_message;
1832	controller->target_abort = spi_imx_target_abort;
1833	controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_NO_CS |
1834				SPI_MOSI_IDLE_LOW;
1835
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1836	if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) ||
1837	    is_imx53_ecspi(spi_imx))
1838		controller->mode_bits |= SPI_LOOP | SPI_READY;
1839
1840	if (is_imx51_ecspi(spi_imx) || is_imx53_ecspi(spi_imx))
1841		controller->mode_bits |= SPI_RX_CPHA_FLIP;
1842
1843	if (is_imx51_ecspi(spi_imx) &&
1844	    device_property_read_u32(&pdev->dev, "cs-gpios", NULL))
1845		/*
1846		 * When using HW-CS implementing SPI_CS_WORD can be done by just
1847		 * setting the burst length to the word size. This is
1848		 * considerably faster than manually controlling the CS.
1849		 */
1850		controller->mode_bits |= SPI_CS_WORD;
1851
1852	if (is_imx51_ecspi(spi_imx) || is_imx53_ecspi(spi_imx)) {
1853		controller->max_native_cs = 4;
1854		controller->flags |= SPI_CONTROLLER_GPIO_SS;
1855	}
1856
1857	spi_imx->spi_drctl = spi_drctl;
1858
1859	init_completion(&spi_imx->xfer_done);
1860
1861	spi_imx->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 
1862	if (IS_ERR(spi_imx->base)) {
1863		ret = PTR_ERR(spi_imx->base);
1864		goto out_controller_put;
1865	}
1866	spi_imx->base_phys = res->start;
1867
1868	irq = platform_get_irq(pdev, 0);
1869	if (irq < 0) {
1870		ret = irq;
1871		goto out_controller_put;
1872	}
1873
1874	ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0,
1875			       dev_name(&pdev->dev), spi_imx);
1876	if (ret) {
1877		dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
1878		goto out_controller_put;
1879	}
1880
1881	spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1882	if (IS_ERR(spi_imx->clk_ipg)) {
1883		ret = PTR_ERR(spi_imx->clk_ipg);
1884		goto out_controller_put;
1885	}
1886
1887	spi_imx->clk_per = devm_clk_get(&pdev->dev, "per");
1888	if (IS_ERR(spi_imx->clk_per)) {
1889		ret = PTR_ERR(spi_imx->clk_per);
1890		goto out_controller_put;
1891	}
1892
1893	ret = clk_prepare_enable(spi_imx->clk_per);
1894	if (ret)
1895		goto out_controller_put;
1896
1897	ret = clk_prepare_enable(spi_imx->clk_ipg);
1898	if (ret)
1899		goto out_put_per;
1900
1901	pm_runtime_set_autosuspend_delay(spi_imx->dev, MXC_RPM_TIMEOUT);
1902	pm_runtime_use_autosuspend(spi_imx->dev);
1903	pm_runtime_get_noresume(spi_imx->dev);
1904	pm_runtime_set_active(spi_imx->dev);
1905	pm_runtime_enable(spi_imx->dev);
1906
1907	spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
1908	/*
1909	 * Only validated on i.mx35 and i.mx6 now, can remove the constraint
1910	 * if validated on other chips.
1911	 */
1912	if (spi_imx->devtype_data->has_dmamode) {
1913		ret = spi_imx_sdma_init(&pdev->dev, spi_imx, controller);
1914		if (ret == -EPROBE_DEFER)
1915			goto out_runtime_pm_put;
1916
1917		if (ret < 0)
1918			dev_dbg(&pdev->dev, "dma setup error %d, use pio\n",
1919				ret);
1920	}
1921
1922	spi_imx->devtype_data->reset(spi_imx);
1923
1924	spi_imx->devtype_data->intctrl(spi_imx, 0);
1925
1926	controller->dev.of_node = pdev->dev.of_node;
1927	ret = spi_register_controller(controller);
1928	if (ret) {
1929		dev_err_probe(&pdev->dev, ret, "register controller failed\n");
1930		goto out_register_controller;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1931	}
1932
1933	pm_runtime_mark_last_busy(spi_imx->dev);
1934	pm_runtime_put_autosuspend(spi_imx->dev);
1935
 
 
1936	return ret;
1937
1938out_register_controller:
1939	if (spi_imx->devtype_data->has_dmamode)
1940		spi_imx_sdma_exit(spi_imx);
1941out_runtime_pm_put:
1942	pm_runtime_dont_use_autosuspend(spi_imx->dev);
1943	pm_runtime_disable(spi_imx->dev);
1944	pm_runtime_set_suspended(&pdev->dev);
1945
1946	clk_disable_unprepare(spi_imx->clk_ipg);
1947out_put_per:
1948	clk_disable_unprepare(spi_imx->clk_per);
1949out_controller_put:
1950	spi_controller_put(controller);
1951
1952	return ret;
1953}
1954
1955static void spi_imx_remove(struct platform_device *pdev)
1956{
1957	struct spi_controller *controller = platform_get_drvdata(pdev);
1958	struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
1959	int ret;
1960
1961	spi_unregister_controller(controller);
1962
1963	ret = pm_runtime_get_sync(spi_imx->dev);
1964	if (ret >= 0)
1965		writel(0, spi_imx->base + MXC_CSPICTRL);
1966	else
1967		dev_warn(spi_imx->dev, "failed to enable clock, skip hw disable\n");
1968
1969	pm_runtime_dont_use_autosuspend(spi_imx->dev);
1970	pm_runtime_put_sync(spi_imx->dev);
1971	pm_runtime_disable(spi_imx->dev);
1972
1973	spi_imx_sdma_exit(spi_imx);
1974}
1975
1976static int spi_imx_runtime_resume(struct device *dev)
1977{
1978	struct spi_controller *controller = dev_get_drvdata(dev);
1979	struct spi_imx_data *spi_imx;
1980	int ret;
1981
1982	spi_imx = spi_controller_get_devdata(controller);
1983
1984	ret = clk_prepare_enable(spi_imx->clk_per);
1985	if (ret)
1986		return ret;
1987
1988	ret = clk_prepare_enable(spi_imx->clk_ipg);
1989	if (ret) {
1990		clk_disable_unprepare(spi_imx->clk_per);
1991		return ret;
1992	}
1993
1994	return 0;
1995}
1996
1997static int spi_imx_runtime_suspend(struct device *dev)
1998{
1999	struct spi_controller *controller = dev_get_drvdata(dev);
2000	struct spi_imx_data *spi_imx;
2001
2002	spi_imx = spi_controller_get_devdata(controller);
2003
2004	clk_disable_unprepare(spi_imx->clk_per);
2005	clk_disable_unprepare(spi_imx->clk_ipg);
 
 
 
2006
2007	return 0;
2008}
2009
2010static int spi_imx_suspend(struct device *dev)
2011{
2012	pinctrl_pm_select_sleep_state(dev);
2013	return 0;
2014}
2015
2016static int spi_imx_resume(struct device *dev)
2017{
2018	pinctrl_pm_select_default_state(dev);
2019	return 0;
2020}
2021
2022static const struct dev_pm_ops imx_spi_pm = {
2023	RUNTIME_PM_OPS(spi_imx_runtime_suspend,	spi_imx_runtime_resume, NULL)
2024	SYSTEM_SLEEP_PM_OPS(spi_imx_suspend, spi_imx_resume)
2025};
2026
2027static struct platform_driver spi_imx_driver = {
2028	.driver = {
2029		   .name = DRIVER_NAME,
2030		   .of_match_table = spi_imx_dt_ids,
2031		   .pm = pm_ptr(&imx_spi_pm),
2032	},
2033	.probe = spi_imx_probe,
2034	.remove = spi_imx_remove,
2035};
2036module_platform_driver(spi_imx_driver);
2037
2038MODULE_DESCRIPTION("i.MX SPI Controller driver");
2039MODULE_AUTHOR("Sascha Hauer, Pengutronix");
2040MODULE_LICENSE("GPL");
2041MODULE_ALIAS("platform:" DRIVER_NAME);
v5.4
   1// SPDX-License-Identifier: GPL-2.0+
   2// Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
   3// Copyright (C) 2008 Juergen Beisert
   4
 
 
   5#include <linux/clk.h>
   6#include <linux/completion.h>
   7#include <linux/delay.h>
   8#include <linux/dmaengine.h>
   9#include <linux/dma-mapping.h>
  10#include <linux/err.h>
  11#include <linux/gpio.h>
  12#include <linux/interrupt.h>
  13#include <linux/io.h>
  14#include <linux/irq.h>
  15#include <linux/kernel.h>
 
 
  16#include <linux/module.h>
 
 
  17#include <linux/platform_device.h>
 
  18#include <linux/slab.h>
  19#include <linux/spi/spi.h>
  20#include <linux/spi/spi_bitbang.h>
  21#include <linux/types.h>
  22#include <linux/of.h>
  23#include <linux/of_device.h>
  24#include <linux/of_gpio.h>
  25
  26#include <linux/platform_data/dma-imx.h>
  27#include <linux/platform_data/spi-imx.h>
  28
  29#define DRIVER_NAME "spi_imx"
  30
  31static bool use_dma = true;
  32module_param(use_dma, bool, 0644);
  33MODULE_PARM_DESC(use_dma, "Enable usage of DMA when available (default)");
  34
 
 
 
 
 
 
 
 
  35#define MXC_CSPIRXDATA		0x00
  36#define MXC_CSPITXDATA		0x04
  37#define MXC_CSPICTRL		0x08
  38#define MXC_CSPIINT		0x0c
  39#define MXC_RESET		0x1c
  40
  41/* generic defines to abstract from the different register layouts */
  42#define MXC_INT_RR	(1 << 0) /* Receive data ready interrupt */
  43#define MXC_INT_TE	(1 << 1) /* Transmit FIFO empty interrupt */
  44#define MXC_INT_RDR	BIT(4) /* Receive date threshold interrupt */
  45
  46/* The maximum bytes that a sdma BD can transfer. */
  47#define MAX_SDMA_BD_BYTES (1 << 15)
  48#define MX51_ECSPI_CTRL_MAX_BURST	512
  49/* The maximum bytes that IMX53_ECSPI can transfer in slave mode.*/
  50#define MX53_MAX_TRANSFER_BYTES		512
  51
  52enum spi_imx_devtype {
  53	IMX1_CSPI,
  54	IMX21_CSPI,
  55	IMX27_CSPI,
  56	IMX31_CSPI,
  57	IMX35_CSPI,	/* CSPI on all i.mx except above */
  58	IMX51_ECSPI,	/* ECSPI on i.mx51 */
  59	IMX53_ECSPI,	/* ECSPI on i.mx53 and later */
  60};
  61
  62struct spi_imx_data;
  63
  64struct spi_imx_devtype_data {
  65	void (*intctrl)(struct spi_imx_data *, int);
  66	int (*prepare_message)(struct spi_imx_data *, struct spi_message *);
  67	int (*prepare_transfer)(struct spi_imx_data *, struct spi_device *,
  68				struct spi_transfer *);
  69	void (*trigger)(struct spi_imx_data *);
  70	int (*rx_available)(struct spi_imx_data *);
  71	void (*reset)(struct spi_imx_data *);
  72	void (*setup_wml)(struct spi_imx_data *);
  73	void (*disable)(struct spi_imx_data *);
  74	bool has_dmamode;
  75	bool has_slavemode;
  76	unsigned int fifo_size;
  77	bool dynamic_burst;
 
 
 
 
 
  78	enum spi_imx_devtype devtype;
  79};
  80
  81struct spi_imx_data {
  82	struct spi_bitbang bitbang;
  83	struct device *dev;
  84
  85	struct completion xfer_done;
  86	void __iomem *base;
  87	unsigned long base_phys;
  88
  89	struct clk *clk_per;
  90	struct clk *clk_ipg;
  91	unsigned long spi_clk;
  92	unsigned int spi_bus_clk;
  93
  94	unsigned int bits_per_word;
  95	unsigned int spi_drctl;
  96
  97	unsigned int count, remainder;
  98	void (*tx)(struct spi_imx_data *);
  99	void (*rx)(struct spi_imx_data *);
 100	void *rx_buf;
 101	const void *tx_buf;
 102	unsigned int txfifo; /* number of words pushed in tx FIFO */
 103	unsigned int dynamic_burst;
 
 104
 105	/* Slave mode */
 106	bool slave_mode;
 107	bool slave_aborted;
 108	unsigned int slave_burst;
 109
 110	/* DMA */
 111	bool usedma;
 112	u32 wml;
 113	struct completion dma_rx_completion;
 114	struct completion dma_tx_completion;
 115
 116	const struct spi_imx_devtype_data *devtype_data;
 117};
 118
 119static inline int is_imx27_cspi(struct spi_imx_data *d)
 120{
 121	return d->devtype_data->devtype == IMX27_CSPI;
 122}
 123
 124static inline int is_imx35_cspi(struct spi_imx_data *d)
 125{
 126	return d->devtype_data->devtype == IMX35_CSPI;
 127}
 128
 129static inline int is_imx51_ecspi(struct spi_imx_data *d)
 130{
 131	return d->devtype_data->devtype == IMX51_ECSPI;
 132}
 133
 134static inline int is_imx53_ecspi(struct spi_imx_data *d)
 135{
 136	return d->devtype_data->devtype == IMX53_ECSPI;
 137}
 138
 139#define MXC_SPI_BUF_RX(type)						\
 140static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx)		\
 141{									\
 142	unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA);	\
 143									\
 144	if (spi_imx->rx_buf) {						\
 145		*(type *)spi_imx->rx_buf = val;				\
 146		spi_imx->rx_buf += sizeof(type);			\
 147	}								\
 148									\
 149	spi_imx->remainder -= sizeof(type);				\
 150}
 151
 152#define MXC_SPI_BUF_TX(type)						\
 153static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx)		\
 154{									\
 155	type val = 0;							\
 156									\
 157	if (spi_imx->tx_buf) {						\
 158		val = *(type *)spi_imx->tx_buf;				\
 159		spi_imx->tx_buf += sizeof(type);			\
 160	}								\
 161									\
 162	spi_imx->count -= sizeof(type);					\
 163									\
 164	writel(val, spi_imx->base + MXC_CSPITXDATA);			\
 165}
 166
 167MXC_SPI_BUF_RX(u8)
 168MXC_SPI_BUF_TX(u8)
 169MXC_SPI_BUF_RX(u16)
 170MXC_SPI_BUF_TX(u16)
 171MXC_SPI_BUF_RX(u32)
 172MXC_SPI_BUF_TX(u32)
 173
 174/* First entry is reserved, second entry is valid only if SDHC_SPIEN is set
 175 * (which is currently not the case in this driver)
 176 */
 177static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192,
 178	256, 384, 512, 768, 1024};
 179
 180/* MX21, MX27 */
 181static unsigned int spi_imx_clkdiv_1(unsigned int fin,
 182		unsigned int fspi, unsigned int max, unsigned int *fres)
 183{
 184	int i;
 185
 186	for (i = 2; i < max; i++)
 187		if (fspi * mxc_clkdivs[i] >= fin)
 188			break;
 189
 190	*fres = fin / mxc_clkdivs[i];
 191	return i;
 192}
 193
 194/* MX1, MX31, MX35, MX51 CSPI */
 195static unsigned int spi_imx_clkdiv_2(unsigned int fin,
 196		unsigned int fspi, unsigned int *fres)
 197{
 198	int i, div = 4;
 199
 200	for (i = 0; i < 7; i++) {
 201		if (fspi * div >= fin)
 202			goto out;
 203		div <<= 1;
 204	}
 205
 206out:
 207	*fres = fin / div;
 208	return i;
 209}
 210
 211static int spi_imx_bytes_per_word(const int bits_per_word)
 212{
 213	if (bits_per_word <= 8)
 214		return 1;
 215	else if (bits_per_word <= 16)
 216		return 2;
 217	else
 218		return 4;
 219}
 220
 221static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
 222			 struct spi_transfer *transfer)
 223{
 224	struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
 225
 226	if (!use_dma)
 227		return false;
 228
 229	if (!master->dma_rx)
 230		return false;
 231
 232	if (spi_imx->slave_mode)
 233		return false;
 234
 235	if (transfer->len < spi_imx->devtype_data->fifo_size)
 236		return false;
 237
 238	spi_imx->dynamic_burst = 0;
 239
 240	return true;
 241}
 242
 
 
 
 
 
 
 
 
 
 
 
 
 243#define MX51_ECSPI_CTRL		0x08
 244#define MX51_ECSPI_CTRL_ENABLE		(1 <<  0)
 245#define MX51_ECSPI_CTRL_XCH		(1 <<  2)
 246#define MX51_ECSPI_CTRL_SMC		(1 << 3)
 247#define MX51_ECSPI_CTRL_MODE_MASK	(0xf << 4)
 248#define MX51_ECSPI_CTRL_DRCTL(drctl)	((drctl) << 16)
 249#define MX51_ECSPI_CTRL_POSTDIV_OFFSET	8
 250#define MX51_ECSPI_CTRL_PREDIV_OFFSET	12
 251#define MX51_ECSPI_CTRL_CS(cs)		((cs) << 18)
 252#define MX51_ECSPI_CTRL_BL_OFFSET	20
 253#define MX51_ECSPI_CTRL_BL_MASK		(0xfff << 20)
 254
 255#define MX51_ECSPI_CONFIG	0x0c
 256#define MX51_ECSPI_CONFIG_SCLKPHA(cs)	(1 << ((cs) +  0))
 257#define MX51_ECSPI_CONFIG_SCLKPOL(cs)	(1 << ((cs) +  4))
 258#define MX51_ECSPI_CONFIG_SBBCTRL(cs)	(1 << ((cs) +  8))
 259#define MX51_ECSPI_CONFIG_SSBPOL(cs)	(1 << ((cs) + 12))
 260#define MX51_ECSPI_CONFIG_SCLKCTL(cs)	(1 << ((cs) + 20))
 
 261
 262#define MX51_ECSPI_INT		0x10
 263#define MX51_ECSPI_INT_TEEN		(1 <<  0)
 264#define MX51_ECSPI_INT_RREN		(1 <<  3)
 265#define MX51_ECSPI_INT_RDREN		(1 <<  4)
 266
 267#define MX51_ECSPI_DMA		0x14
 268#define MX51_ECSPI_DMA_TX_WML(wml)	((wml) & 0x3f)
 269#define MX51_ECSPI_DMA_RX_WML(wml)	(((wml) & 0x3f) << 16)
 270#define MX51_ECSPI_DMA_RXT_WML(wml)	(((wml) & 0x3f) << 24)
 271
 272#define MX51_ECSPI_DMA_TEDEN		(1 << 7)
 273#define MX51_ECSPI_DMA_RXDEN		(1 << 23)
 274#define MX51_ECSPI_DMA_RXTDEN		(1 << 31)
 275
 276#define MX51_ECSPI_STAT		0x18
 277#define MX51_ECSPI_STAT_RR		(1 <<  3)
 278
 
 
 
 
 
 
 
 
 
 
 
 
 279#define MX51_ECSPI_TESTREG	0x20
 280#define MX51_ECSPI_TESTREG_LBC	BIT(31)
 281
 282static void spi_imx_buf_rx_swap_u32(struct spi_imx_data *spi_imx)
 283{
 284	unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA);
 285#ifdef __LITTLE_ENDIAN
 286	unsigned int bytes_per_word;
 287#endif
 288
 289	if (spi_imx->rx_buf) {
 290#ifdef __LITTLE_ENDIAN
 
 
 291		bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
 292		if (bytes_per_word == 1)
 293			val = cpu_to_be32(val);
 294		else if (bytes_per_word == 2)
 295			val = (val << 16) | (val >> 16);
 296#endif
 297		*(u32 *)spi_imx->rx_buf = val;
 298		spi_imx->rx_buf += sizeof(u32);
 299	}
 300
 301	spi_imx->remainder -= sizeof(u32);
 302}
 303
 304static void spi_imx_buf_rx_swap(struct spi_imx_data *spi_imx)
 305{
 306	int unaligned;
 307	u32 val;
 308
 309	unaligned = spi_imx->remainder % 4;
 310
 311	if (!unaligned) {
 312		spi_imx_buf_rx_swap_u32(spi_imx);
 313		return;
 314	}
 315
 316	if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) {
 317		spi_imx_buf_rx_u16(spi_imx);
 318		return;
 319	}
 320
 321	val = readl(spi_imx->base + MXC_CSPIRXDATA);
 322
 323	while (unaligned--) {
 324		if (spi_imx->rx_buf) {
 325			*(u8 *)spi_imx->rx_buf = (val >> (8 * unaligned)) & 0xff;
 326			spi_imx->rx_buf++;
 327		}
 328		spi_imx->remainder--;
 329	}
 330}
 331
 332static void spi_imx_buf_tx_swap_u32(struct spi_imx_data *spi_imx)
 333{
 334	u32 val = 0;
 335#ifdef __LITTLE_ENDIAN
 336	unsigned int bytes_per_word;
 337#endif
 338
 339	if (spi_imx->tx_buf) {
 340		val = *(u32 *)spi_imx->tx_buf;
 341		spi_imx->tx_buf += sizeof(u32);
 342	}
 343
 344	spi_imx->count -= sizeof(u32);
 345#ifdef __LITTLE_ENDIAN
 346	bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
 347
 348	if (bytes_per_word == 1)
 349		val = cpu_to_be32(val);
 350	else if (bytes_per_word == 2)
 351		val = (val << 16) | (val >> 16);
 352#endif
 353	writel(val, spi_imx->base + MXC_CSPITXDATA);
 354}
 355
 356static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx)
 357{
 358	int unaligned;
 359	u32 val = 0;
 360
 361	unaligned = spi_imx->count % 4;
 362
 363	if (!unaligned) {
 364		spi_imx_buf_tx_swap_u32(spi_imx);
 365		return;
 366	}
 367
 368	if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) {
 369		spi_imx_buf_tx_u16(spi_imx);
 370		return;
 371	}
 372
 373	while (unaligned--) {
 374		if (spi_imx->tx_buf) {
 375			val |= *(u8 *)spi_imx->tx_buf << (8 * unaligned);
 376			spi_imx->tx_buf++;
 377		}
 378		spi_imx->count--;
 379	}
 380
 381	writel(val, spi_imx->base + MXC_CSPITXDATA);
 382}
 383
 384static void mx53_ecspi_rx_slave(struct spi_imx_data *spi_imx)
 385{
 386	u32 val = be32_to_cpu(readl(spi_imx->base + MXC_CSPIRXDATA));
 387
 388	if (spi_imx->rx_buf) {
 389		int n_bytes = spi_imx->slave_burst % sizeof(val);
 390
 391		if (!n_bytes)
 392			n_bytes = sizeof(val);
 393
 394		memcpy(spi_imx->rx_buf,
 395		       ((u8 *)&val) + sizeof(val) - n_bytes, n_bytes);
 396
 397		spi_imx->rx_buf += n_bytes;
 398		spi_imx->slave_burst -= n_bytes;
 399	}
 400
 401	spi_imx->remainder -= sizeof(u32);
 402}
 403
 404static void mx53_ecspi_tx_slave(struct spi_imx_data *spi_imx)
 405{
 406	u32 val = 0;
 407	int n_bytes = spi_imx->count % sizeof(val);
 408
 409	if (!n_bytes)
 410		n_bytes = sizeof(val);
 411
 412	if (spi_imx->tx_buf) {
 413		memcpy(((u8 *)&val) + sizeof(val) - n_bytes,
 414		       spi_imx->tx_buf, n_bytes);
 415		val = cpu_to_be32(val);
 416		spi_imx->tx_buf += n_bytes;
 417	}
 418
 419	spi_imx->count -= n_bytes;
 420
 421	writel(val, spi_imx->base + MXC_CSPITXDATA);
 422}
 423
 424/* MX51 eCSPI */
 425static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx,
 426				      unsigned int fspi, unsigned int *fres)
 427{
 428	/*
 429	 * there are two 4-bit dividers, the pre-divider divides by
 430	 * $pre, the post-divider by 2^$post
 431	 */
 432	unsigned int pre, post;
 433	unsigned int fin = spi_imx->spi_clk;
 434
 435	if (unlikely(fspi > fin))
 436		return 0;
 437
 438	post = fls(fin) - fls(fspi);
 439	if (fin > fspi << post)
 440		post++;
 441
 442	/* now we have: (fin <= fspi << post) with post being minimal */
 443
 444	post = max(4U, post) - 4;
 445	if (unlikely(post > 0xf)) {
 446		dev_err(spi_imx->dev, "cannot set clock freq: %u (base freq: %u)\n",
 447				fspi, fin);
 448		return 0xff;
 449	}
 450
 451	pre = DIV_ROUND_UP(fin, fspi << post) - 1;
 452
 453	dev_dbg(spi_imx->dev, "%s: fin: %u, fspi: %u, post: %u, pre: %u\n",
 454			__func__, fin, fspi, post, pre);
 455
 456	/* Resulting frequency for the SCLK line. */
 457	*fres = (fin / (pre + 1)) >> post;
 458
 459	return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) |
 460		(post << MX51_ECSPI_CTRL_POSTDIV_OFFSET);
 461}
 462
 463static void mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
 464{
 465	unsigned val = 0;
 466
 467	if (enable & MXC_INT_TE)
 468		val |= MX51_ECSPI_INT_TEEN;
 469
 470	if (enable & MXC_INT_RR)
 471		val |= MX51_ECSPI_INT_RREN;
 472
 473	if (enable & MXC_INT_RDR)
 474		val |= MX51_ECSPI_INT_RDREN;
 475
 476	writel(val, spi_imx->base + MX51_ECSPI_INT);
 477}
 478
 479static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
 480{
 481	u32 reg;
 482
 483	reg = readl(spi_imx->base + MX51_ECSPI_CTRL);
 484	reg |= MX51_ECSPI_CTRL_XCH;
 485	writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
 486}
 487
 488static void mx51_ecspi_disable(struct spi_imx_data *spi_imx)
 489{
 490	u32 ctrl;
 491
 492	ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
 493	ctrl &= ~MX51_ECSPI_CTRL_ENABLE;
 494	writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
 495}
 496
 
 
 
 
 
 
 
 497static int mx51_ecspi_prepare_message(struct spi_imx_data *spi_imx,
 498				      struct spi_message *msg)
 499{
 500	struct spi_device *spi = msg->spi;
 
 501	u32 ctrl = MX51_ECSPI_CTRL_ENABLE;
 502	u32 testreg;
 
 503	u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
 
 
 504
 505	/* set Master or Slave mode */
 506	if (spi_imx->slave_mode)
 507		ctrl &= ~MX51_ECSPI_CTRL_MODE_MASK;
 508	else
 509		ctrl |= MX51_ECSPI_CTRL_MODE_MASK;
 510
 511	/*
 512	 * Enable SPI_RDY handling (falling edge/level triggered).
 513	 */
 514	if (spi->mode & SPI_READY)
 515		ctrl |= MX51_ECSPI_CTRL_DRCTL(spi_imx->spi_drctl);
 516
 517	/* set chip select to use */
 518	ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select);
 519
 520	/*
 521	 * The ctrl register must be written first, with the EN bit set other
 522	 * registers must not be written to.
 523	 */
 524	writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
 525
 526	testreg = readl(spi_imx->base + MX51_ECSPI_TESTREG);
 527	if (spi->mode & SPI_LOOP)
 528		testreg |= MX51_ECSPI_TESTREG_LBC;
 529	else
 530		testreg &= ~MX51_ECSPI_TESTREG_LBC;
 531	writel(testreg, spi_imx->base + MX51_ECSPI_TESTREG);
 532
 533	/*
 534	 * eCSPI burst completion by Chip Select signal in Slave mode
 535	 * is not functional for imx53 Soc, config SPI burst completed when
 536	 * BURST_LENGTH + 1 bits are received
 537	 */
 538	if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx))
 539		cfg &= ~MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select);
 540	else
 541		cfg |= MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select);
 542
 543	if (spi->mode & SPI_CPHA)
 544		cfg |= MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
 545	else
 546		cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
 547
 548	if (spi->mode & SPI_CPOL) {
 549		cfg |= MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select);
 550		cfg |= MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select);
 551	} else {
 552		cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select);
 553		cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select);
 554	}
 555
 
 
 
 
 
 556	if (spi->mode & SPI_CS_HIGH)
 557		cfg |= MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select);
 558	else
 559		cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select);
 
 
 
 560
 561	writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
 562
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 563	return 0;
 564}
 565
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 566static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
 567				       struct spi_device *spi,
 568				       struct spi_transfer *t)
 569{
 570	u32 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
 571	u32 clk = t->speed_hz, delay;
 
 572
 573	/* Clear BL field and set the right value */
 574	ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
 575	if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx))
 576		ctrl |= (spi_imx->slave_burst * 8 - 1)
 577			<< MX51_ECSPI_CTRL_BL_OFFSET;
 578	else
 579		ctrl |= (spi_imx->bits_per_word - 1)
 580			<< MX51_ECSPI_CTRL_BL_OFFSET;
 
 581
 582	/* set clock speed */
 583	ctrl &= ~(0xf << MX51_ECSPI_CTRL_POSTDIV_OFFSET |
 584		  0xf << MX51_ECSPI_CTRL_PREDIV_OFFSET);
 585	ctrl |= mx51_ecspi_clkdiv(spi_imx, t->speed_hz, &clk);
 586	spi_imx->spi_bus_clk = clk;
 587
 588	if (spi_imx->usedma)
 
 
 
 
 
 
 589		ctrl |= MX51_ECSPI_CTRL_SMC;
 
 
 590
 591	writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
 592
 593	/*
 594	 * Wait until the changes in the configuration register CONFIGREG
 595	 * propagate into the hardware. It takes exactly one tick of the
 596	 * SCLK clock, but we will wait two SCLK clock just to be sure. The
 597	 * effect of the delay it takes for the hardware to apply changes
 598	 * is noticable if the SCLK clock run very slow. In such a case, if
 599	 * the polarity of SCLK should be inverted, the GPIO ChipSelect might
 600	 * be asserted before the SCLK polarity changes, which would disrupt
 601	 * the SPI communication as the device on the other end would consider
 602	 * the change of SCLK polarity as a clock tick already.
 603	 */
 604	delay = (2 * 1000000) / clk;
 605	if (likely(delay < 10))	/* SCLK is faster than 100 kHz */
 606		udelay(delay);
 607	else			/* SCLK is _very_ slow */
 608		usleep_range(delay, delay + 10);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 609
 610	return 0;
 611}
 612
 613static void mx51_setup_wml(struct spi_imx_data *spi_imx)
 614{
 
 
 
 
 615	/*
 616	 * Configure the DMA register: setup the watermark
 617	 * and enable DMA request.
 618	 */
 619	writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml - 1) |
 620		MX51_ECSPI_DMA_TX_WML(spi_imx->wml) |
 621		MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) |
 622		MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN |
 623		MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);
 624}
 625
 626static int mx51_ecspi_rx_available(struct spi_imx_data *spi_imx)
 627{
 628	return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR;
 629}
 630
 631static void mx51_ecspi_reset(struct spi_imx_data *spi_imx)
 632{
 633	/* drain receive buffer */
 634	while (mx51_ecspi_rx_available(spi_imx))
 635		readl(spi_imx->base + MXC_CSPIRXDATA);
 636}
 637
 638#define MX31_INTREG_TEEN	(1 << 0)
 639#define MX31_INTREG_RREN	(1 << 3)
 640
 641#define MX31_CSPICTRL_ENABLE	(1 << 0)
 642#define MX31_CSPICTRL_MASTER	(1 << 1)
 643#define MX31_CSPICTRL_XCH	(1 << 2)
 644#define MX31_CSPICTRL_SMC	(1 << 3)
 645#define MX31_CSPICTRL_POL	(1 << 4)
 646#define MX31_CSPICTRL_PHA	(1 << 5)
 647#define MX31_CSPICTRL_SSCTL	(1 << 6)
 648#define MX31_CSPICTRL_SSPOL	(1 << 7)
 649#define MX31_CSPICTRL_BC_SHIFT	8
 650#define MX35_CSPICTRL_BL_SHIFT	20
 651#define MX31_CSPICTRL_CS_SHIFT	24
 652#define MX35_CSPICTRL_CS_SHIFT	12
 653#define MX31_CSPICTRL_DR_SHIFT	16
 654
 655#define MX31_CSPI_DMAREG	0x10
 656#define MX31_DMAREG_RH_DEN	(1<<4)
 657#define MX31_DMAREG_TH_DEN	(1<<1)
 658
 659#define MX31_CSPISTATUS		0x14
 660#define MX31_STATUS_RR		(1 << 3)
 661
 662#define MX31_CSPI_TESTREG	0x1C
 663#define MX31_TEST_LBC		(1 << 14)
 664
 665/* These functions also work for the i.MX35, but be aware that
 666 * the i.MX35 has a slightly different register layout for bits
 667 * we do not use here.
 668 */
 669static void mx31_intctrl(struct spi_imx_data *spi_imx, int enable)
 670{
 671	unsigned int val = 0;
 672
 673	if (enable & MXC_INT_TE)
 674		val |= MX31_INTREG_TEEN;
 675	if (enable & MXC_INT_RR)
 676		val |= MX31_INTREG_RREN;
 677
 678	writel(val, spi_imx->base + MXC_CSPIINT);
 679}
 680
 681static void mx31_trigger(struct spi_imx_data *spi_imx)
 682{
 683	unsigned int reg;
 684
 685	reg = readl(spi_imx->base + MXC_CSPICTRL);
 686	reg |= MX31_CSPICTRL_XCH;
 687	writel(reg, spi_imx->base + MXC_CSPICTRL);
 688}
 689
 690static int mx31_prepare_message(struct spi_imx_data *spi_imx,
 691				struct spi_message *msg)
 692{
 693	return 0;
 694}
 695
 696static int mx31_prepare_transfer(struct spi_imx_data *spi_imx,
 697				 struct spi_device *spi,
 698				 struct spi_transfer *t)
 699{
 700	unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
 701	unsigned int clk;
 702
 703	reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, t->speed_hz, &clk) <<
 704		MX31_CSPICTRL_DR_SHIFT;
 705	spi_imx->spi_bus_clk = clk;
 706
 707	if (is_imx35_cspi(spi_imx)) {
 708		reg |= (spi_imx->bits_per_word - 1) << MX35_CSPICTRL_BL_SHIFT;
 709		reg |= MX31_CSPICTRL_SSCTL;
 710	} else {
 711		reg |= (spi_imx->bits_per_word - 1) << MX31_CSPICTRL_BC_SHIFT;
 712	}
 713
 714	if (spi->mode & SPI_CPHA)
 715		reg |= MX31_CSPICTRL_PHA;
 716	if (spi->mode & SPI_CPOL)
 717		reg |= MX31_CSPICTRL_POL;
 718	if (spi->mode & SPI_CS_HIGH)
 719		reg |= MX31_CSPICTRL_SSPOL;
 720	if (!gpio_is_valid(spi->cs_gpio))
 721		reg |= (spi->chip_select) <<
 722			(is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT :
 723						  MX31_CSPICTRL_CS_SHIFT);
 724
 725	if (spi_imx->usedma)
 726		reg |= MX31_CSPICTRL_SMC;
 727
 728	writel(reg, spi_imx->base + MXC_CSPICTRL);
 729
 730	reg = readl(spi_imx->base + MX31_CSPI_TESTREG);
 731	if (spi->mode & SPI_LOOP)
 732		reg |= MX31_TEST_LBC;
 733	else
 734		reg &= ~MX31_TEST_LBC;
 735	writel(reg, spi_imx->base + MX31_CSPI_TESTREG);
 736
 737	if (spi_imx->usedma) {
 738		/*
 739		 * configure DMA requests when RXFIFO is half full and
 740		 * when TXFIFO is half empty
 741		 */
 742		writel(MX31_DMAREG_RH_DEN | MX31_DMAREG_TH_DEN,
 743			spi_imx->base + MX31_CSPI_DMAREG);
 744	}
 745
 746	return 0;
 747}
 748
 749static int mx31_rx_available(struct spi_imx_data *spi_imx)
 750{
 751	return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR;
 752}
 753
 754static void mx31_reset(struct spi_imx_data *spi_imx)
 755{
 756	/* drain receive buffer */
 757	while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR)
 758		readl(spi_imx->base + MXC_CSPIRXDATA);
 759}
 760
 761#define MX21_INTREG_RR		(1 << 4)
 762#define MX21_INTREG_TEEN	(1 << 9)
 763#define MX21_INTREG_RREN	(1 << 13)
 764
 765#define MX21_CSPICTRL_POL	(1 << 5)
 766#define MX21_CSPICTRL_PHA	(1 << 6)
 767#define MX21_CSPICTRL_SSPOL	(1 << 8)
 768#define MX21_CSPICTRL_XCH	(1 << 9)
 769#define MX21_CSPICTRL_ENABLE	(1 << 10)
 770#define MX21_CSPICTRL_MASTER	(1 << 11)
 771#define MX21_CSPICTRL_DR_SHIFT	14
 772#define MX21_CSPICTRL_CS_SHIFT	19
 773
 774static void mx21_intctrl(struct spi_imx_data *spi_imx, int enable)
 775{
 776	unsigned int val = 0;
 777
 778	if (enable & MXC_INT_TE)
 779		val |= MX21_INTREG_TEEN;
 780	if (enable & MXC_INT_RR)
 781		val |= MX21_INTREG_RREN;
 782
 783	writel(val, spi_imx->base + MXC_CSPIINT);
 784}
 785
 786static void mx21_trigger(struct spi_imx_data *spi_imx)
 787{
 788	unsigned int reg;
 789
 790	reg = readl(spi_imx->base + MXC_CSPICTRL);
 791	reg |= MX21_CSPICTRL_XCH;
 792	writel(reg, spi_imx->base + MXC_CSPICTRL);
 793}
 794
 795static int mx21_prepare_message(struct spi_imx_data *spi_imx,
 796				struct spi_message *msg)
 797{
 798	return 0;
 799}
 800
 801static int mx21_prepare_transfer(struct spi_imx_data *spi_imx,
 802				 struct spi_device *spi,
 803				 struct spi_transfer *t)
 804{
 805	unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
 806	unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
 807	unsigned int clk;
 808
 809	reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, t->speed_hz, max, &clk)
 810		<< MX21_CSPICTRL_DR_SHIFT;
 811	spi_imx->spi_bus_clk = clk;
 812
 813	reg |= spi_imx->bits_per_word - 1;
 814
 815	if (spi->mode & SPI_CPHA)
 816		reg |= MX21_CSPICTRL_PHA;
 817	if (spi->mode & SPI_CPOL)
 818		reg |= MX21_CSPICTRL_POL;
 819	if (spi->mode & SPI_CS_HIGH)
 820		reg |= MX21_CSPICTRL_SSPOL;
 821	if (!gpio_is_valid(spi->cs_gpio))
 822		reg |= spi->chip_select << MX21_CSPICTRL_CS_SHIFT;
 823
 824	writel(reg, spi_imx->base + MXC_CSPICTRL);
 825
 826	return 0;
 827}
 828
 829static int mx21_rx_available(struct spi_imx_data *spi_imx)
 830{
 831	return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR;
 832}
 833
 834static void mx21_reset(struct spi_imx_data *spi_imx)
 835{
 836	writel(1, spi_imx->base + MXC_RESET);
 837}
 838
 839#define MX1_INTREG_RR		(1 << 3)
 840#define MX1_INTREG_TEEN		(1 << 8)
 841#define MX1_INTREG_RREN		(1 << 11)
 842
 843#define MX1_CSPICTRL_POL	(1 << 4)
 844#define MX1_CSPICTRL_PHA	(1 << 5)
 845#define MX1_CSPICTRL_XCH	(1 << 8)
 846#define MX1_CSPICTRL_ENABLE	(1 << 9)
 847#define MX1_CSPICTRL_MASTER	(1 << 10)
 848#define MX1_CSPICTRL_DR_SHIFT	13
 849
 850static void mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
 851{
 852	unsigned int val = 0;
 853
 854	if (enable & MXC_INT_TE)
 855		val |= MX1_INTREG_TEEN;
 856	if (enable & MXC_INT_RR)
 857		val |= MX1_INTREG_RREN;
 858
 859	writel(val, spi_imx->base + MXC_CSPIINT);
 860}
 861
 862static void mx1_trigger(struct spi_imx_data *spi_imx)
 863{
 864	unsigned int reg;
 865
 866	reg = readl(spi_imx->base + MXC_CSPICTRL);
 867	reg |= MX1_CSPICTRL_XCH;
 868	writel(reg, spi_imx->base + MXC_CSPICTRL);
 869}
 870
 871static int mx1_prepare_message(struct spi_imx_data *spi_imx,
 872			       struct spi_message *msg)
 873{
 874	return 0;
 875}
 876
 877static int mx1_prepare_transfer(struct spi_imx_data *spi_imx,
 878				struct spi_device *spi,
 879				struct spi_transfer *t)
 880{
 881	unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;
 882	unsigned int clk;
 883
 884	reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, t->speed_hz, &clk) <<
 885		MX1_CSPICTRL_DR_SHIFT;
 886	spi_imx->spi_bus_clk = clk;
 887
 888	reg |= spi_imx->bits_per_word - 1;
 889
 890	if (spi->mode & SPI_CPHA)
 891		reg |= MX1_CSPICTRL_PHA;
 892	if (spi->mode & SPI_CPOL)
 893		reg |= MX1_CSPICTRL_POL;
 894
 895	writel(reg, spi_imx->base + MXC_CSPICTRL);
 896
 897	return 0;
 898}
 899
 900static int mx1_rx_available(struct spi_imx_data *spi_imx)
 901{
 902	return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR;
 903}
 904
 905static void mx1_reset(struct spi_imx_data *spi_imx)
 906{
 907	writel(1, spi_imx->base + MXC_RESET);
 908}
 909
 910static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
 911	.intctrl = mx1_intctrl,
 912	.prepare_message = mx1_prepare_message,
 913	.prepare_transfer = mx1_prepare_transfer,
 914	.trigger = mx1_trigger,
 915	.rx_available = mx1_rx_available,
 916	.reset = mx1_reset,
 917	.fifo_size = 8,
 918	.has_dmamode = false,
 919	.dynamic_burst = false,
 920	.has_slavemode = false,
 921	.devtype = IMX1_CSPI,
 922};
 923
 924static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
 925	.intctrl = mx21_intctrl,
 926	.prepare_message = mx21_prepare_message,
 927	.prepare_transfer = mx21_prepare_transfer,
 928	.trigger = mx21_trigger,
 929	.rx_available = mx21_rx_available,
 930	.reset = mx21_reset,
 931	.fifo_size = 8,
 932	.has_dmamode = false,
 933	.dynamic_burst = false,
 934	.has_slavemode = false,
 935	.devtype = IMX21_CSPI,
 936};
 937
 938static struct spi_imx_devtype_data imx27_cspi_devtype_data = {
 939	/* i.mx27 cspi shares the functions with i.mx21 one */
 940	.intctrl = mx21_intctrl,
 941	.prepare_message = mx21_prepare_message,
 942	.prepare_transfer = mx21_prepare_transfer,
 943	.trigger = mx21_trigger,
 944	.rx_available = mx21_rx_available,
 945	.reset = mx21_reset,
 946	.fifo_size = 8,
 947	.has_dmamode = false,
 948	.dynamic_burst = false,
 949	.has_slavemode = false,
 950	.devtype = IMX27_CSPI,
 951};
 952
 953static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
 954	.intctrl = mx31_intctrl,
 955	.prepare_message = mx31_prepare_message,
 956	.prepare_transfer = mx31_prepare_transfer,
 957	.trigger = mx31_trigger,
 958	.rx_available = mx31_rx_available,
 959	.reset = mx31_reset,
 960	.fifo_size = 8,
 961	.has_dmamode = false,
 962	.dynamic_burst = false,
 963	.has_slavemode = false,
 964	.devtype = IMX31_CSPI,
 965};
 966
 967static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
 968	/* i.mx35 and later cspi shares the functions with i.mx31 one */
 969	.intctrl = mx31_intctrl,
 970	.prepare_message = mx31_prepare_message,
 971	.prepare_transfer = mx31_prepare_transfer,
 972	.trigger = mx31_trigger,
 973	.rx_available = mx31_rx_available,
 974	.reset = mx31_reset,
 975	.fifo_size = 8,
 976	.has_dmamode = true,
 977	.dynamic_burst = false,
 978	.has_slavemode = false,
 979	.devtype = IMX35_CSPI,
 980};
 981
 982static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
 983	.intctrl = mx51_ecspi_intctrl,
 984	.prepare_message = mx51_ecspi_prepare_message,
 985	.prepare_transfer = mx51_ecspi_prepare_transfer,
 986	.trigger = mx51_ecspi_trigger,
 987	.rx_available = mx51_ecspi_rx_available,
 988	.reset = mx51_ecspi_reset,
 989	.setup_wml = mx51_setup_wml,
 990	.fifo_size = 64,
 991	.has_dmamode = true,
 992	.dynamic_burst = true,
 993	.has_slavemode = true,
 994	.disable = mx51_ecspi_disable,
 995	.devtype = IMX51_ECSPI,
 996};
 997
 998static struct spi_imx_devtype_data imx53_ecspi_devtype_data = {
 999	.intctrl = mx51_ecspi_intctrl,
1000	.prepare_message = mx51_ecspi_prepare_message,
1001	.prepare_transfer = mx51_ecspi_prepare_transfer,
1002	.trigger = mx51_ecspi_trigger,
1003	.rx_available = mx51_ecspi_rx_available,
1004	.reset = mx51_ecspi_reset,
1005	.fifo_size = 64,
1006	.has_dmamode = true,
1007	.has_slavemode = true,
1008	.disable = mx51_ecspi_disable,
1009	.devtype = IMX53_ECSPI,
1010};
1011
1012static const struct platform_device_id spi_imx_devtype[] = {
1013	{
1014		.name = "imx1-cspi",
1015		.driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data,
1016	}, {
1017		.name = "imx21-cspi",
1018		.driver_data = (kernel_ulong_t) &imx21_cspi_devtype_data,
1019	}, {
1020		.name = "imx27-cspi",
1021		.driver_data = (kernel_ulong_t) &imx27_cspi_devtype_data,
1022	}, {
1023		.name = "imx31-cspi",
1024		.driver_data = (kernel_ulong_t) &imx31_cspi_devtype_data,
1025	}, {
1026		.name = "imx35-cspi",
1027		.driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data,
1028	}, {
1029		.name = "imx51-ecspi",
1030		.driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data,
1031	}, {
1032		.name = "imx53-ecspi",
1033		.driver_data = (kernel_ulong_t) &imx53_ecspi_devtype_data,
1034	}, {
1035		/* sentinel */
1036	}
1037};
1038
1039static const struct of_device_id spi_imx_dt_ids[] = {
1040	{ .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
1041	{ .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
1042	{ .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
1043	{ .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
1044	{ .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
1045	{ .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
1046	{ .compatible = "fsl,imx53-ecspi", .data = &imx53_ecspi_devtype_data, },
 
1047	{ /* sentinel */ }
1048};
1049MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);
1050
1051static void spi_imx_chipselect(struct spi_device *spi, int is_active)
1052{
1053	int active = is_active != BITBANG_CS_INACTIVE;
1054	int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH);
1055
1056	if (spi->mode & SPI_NO_CS)
1057		return;
1058
1059	if (!gpio_is_valid(spi->cs_gpio))
1060		return;
1061
1062	gpio_set_value(spi->cs_gpio, dev_is_lowactive ^ active);
1063}
1064
1065static void spi_imx_set_burst_len(struct spi_imx_data *spi_imx, int n_bits)
1066{
1067	u32 ctrl;
1068
1069	ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
1070	ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
1071	ctrl |= ((n_bits - 1) << MX51_ECSPI_CTRL_BL_OFFSET);
1072	writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
1073}
1074
1075static void spi_imx_push(struct spi_imx_data *spi_imx)
1076{
1077	unsigned int burst_len, fifo_words;
1078
1079	if (spi_imx->dynamic_burst)
1080		fifo_words = 4;
1081	else
1082		fifo_words = spi_imx_bytes_per_word(spi_imx->bits_per_word);
1083	/*
1084	 * Reload the FIFO when the remaining bytes to be transferred in the
1085	 * current burst is 0. This only applies when bits_per_word is a
1086	 * multiple of 8.
1087	 */
1088	if (!spi_imx->remainder) {
1089		if (spi_imx->dynamic_burst) {
1090
1091			/* We need to deal unaligned data first */
1092			burst_len = spi_imx->count % MX51_ECSPI_CTRL_MAX_BURST;
1093
1094			if (!burst_len)
1095				burst_len = MX51_ECSPI_CTRL_MAX_BURST;
1096
1097			spi_imx_set_burst_len(spi_imx, burst_len * 8);
1098
1099			spi_imx->remainder = burst_len;
1100		} else {
1101			spi_imx->remainder = fifo_words;
1102		}
1103	}
1104
1105	while (spi_imx->txfifo < spi_imx->devtype_data->fifo_size) {
1106		if (!spi_imx->count)
1107			break;
1108		if (spi_imx->dynamic_burst &&
1109		    spi_imx->txfifo >= DIV_ROUND_UP(spi_imx->remainder,
1110						     fifo_words))
1111			break;
1112		spi_imx->tx(spi_imx);
1113		spi_imx->txfifo++;
1114	}
1115
1116	if (!spi_imx->slave_mode)
1117		spi_imx->devtype_data->trigger(spi_imx);
1118}
1119
1120static irqreturn_t spi_imx_isr(int irq, void *dev_id)
1121{
1122	struct spi_imx_data *spi_imx = dev_id;
1123
1124	while (spi_imx->txfifo &&
1125	       spi_imx->devtype_data->rx_available(spi_imx)) {
1126		spi_imx->rx(spi_imx);
1127		spi_imx->txfifo--;
1128	}
1129
1130	if (spi_imx->count) {
1131		spi_imx_push(spi_imx);
1132		return IRQ_HANDLED;
1133	}
1134
1135	if (spi_imx->txfifo) {
1136		/* No data left to push, but still waiting for rx data,
1137		 * enable receive data available interrupt.
1138		 */
1139		spi_imx->devtype_data->intctrl(
1140				spi_imx, MXC_INT_RR);
1141		return IRQ_HANDLED;
1142	}
1143
1144	spi_imx->devtype_data->intctrl(spi_imx, 0);
1145	complete(&spi_imx->xfer_done);
1146
1147	return IRQ_HANDLED;
1148}
1149
1150static int spi_imx_dma_configure(struct spi_master *master)
1151{
1152	int ret;
1153	enum dma_slave_buswidth buswidth;
1154	struct dma_slave_config rx = {}, tx = {};
1155	struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1156
1157	switch (spi_imx_bytes_per_word(spi_imx->bits_per_word)) {
1158	case 4:
1159		buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
1160		break;
1161	case 2:
1162		buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
1163		break;
1164	case 1:
1165		buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
1166		break;
1167	default:
1168		return -EINVAL;
1169	}
1170
1171	tx.direction = DMA_MEM_TO_DEV;
1172	tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA;
1173	tx.dst_addr_width = buswidth;
1174	tx.dst_maxburst = spi_imx->wml;
1175	ret = dmaengine_slave_config(master->dma_tx, &tx);
1176	if (ret) {
1177		dev_err(spi_imx->dev, "TX dma configuration failed with %d\n", ret);
1178		return ret;
1179	}
1180
1181	rx.direction = DMA_DEV_TO_MEM;
1182	rx.src_addr = spi_imx->base_phys + MXC_CSPIRXDATA;
1183	rx.src_addr_width = buswidth;
1184	rx.src_maxburst = spi_imx->wml;
1185	ret = dmaengine_slave_config(master->dma_rx, &rx);
1186	if (ret) {
1187		dev_err(spi_imx->dev, "RX dma configuration failed with %d\n", ret);
1188		return ret;
1189	}
1190
1191	return 0;
1192}
1193
1194static int spi_imx_setupxfer(struct spi_device *spi,
1195				 struct spi_transfer *t)
1196{
1197	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1198
1199	if (!t)
1200		return 0;
1201
 
 
 
 
 
 
 
 
 
 
1202	spi_imx->bits_per_word = t->bits_per_word;
 
1203
1204	/*
1205	 * Initialize the functions for transfer. To transfer non byte-aligned
1206	 * words, we have to use multiple word-size bursts, we can't use
1207	 * dynamic_burst in that case.
 
1208	 */
1209	if (spi_imx->devtype_data->dynamic_burst && !spi_imx->slave_mode &&
 
 
1210	    (spi_imx->bits_per_word == 8 ||
1211	    spi_imx->bits_per_word == 16 ||
1212	    spi_imx->bits_per_word == 32)) {
1213
1214		spi_imx->rx = spi_imx_buf_rx_swap;
1215		spi_imx->tx = spi_imx_buf_tx_swap;
1216		spi_imx->dynamic_burst = 1;
1217
1218	} else {
1219		if (spi_imx->bits_per_word <= 8) {
1220			spi_imx->rx = spi_imx_buf_rx_u8;
1221			spi_imx->tx = spi_imx_buf_tx_u8;
1222		} else if (spi_imx->bits_per_word <= 16) {
1223			spi_imx->rx = spi_imx_buf_rx_u16;
1224			spi_imx->tx = spi_imx_buf_tx_u16;
1225		} else {
1226			spi_imx->rx = spi_imx_buf_rx_u32;
1227			spi_imx->tx = spi_imx_buf_tx_u32;
1228		}
1229		spi_imx->dynamic_burst = 0;
1230	}
1231
1232	if (spi_imx_can_dma(spi_imx->bitbang.master, spi, t))
1233		spi_imx->usedma = 1;
1234	else
1235		spi_imx->usedma = 0;
1236
1237	if (is_imx53_ecspi(spi_imx) && spi_imx->slave_mode) {
1238		spi_imx->rx = mx53_ecspi_rx_slave;
1239		spi_imx->tx = mx53_ecspi_tx_slave;
1240		spi_imx->slave_burst = t->len;
 
 
 
1241	}
1242
1243	spi_imx->devtype_data->prepare_transfer(spi_imx, spi, t);
1244
1245	return 0;
1246}
1247
1248static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
1249{
1250	struct spi_master *master = spi_imx->bitbang.master;
1251
1252	if (master->dma_rx) {
1253		dma_release_channel(master->dma_rx);
1254		master->dma_rx = NULL;
1255	}
1256
1257	if (master->dma_tx) {
1258		dma_release_channel(master->dma_tx);
1259		master->dma_tx = NULL;
1260	}
1261}
1262
1263static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
1264			     struct spi_master *master)
1265{
1266	int ret;
1267
1268	/* use pio mode for i.mx6dl chip TKT238285 */
1269	if (of_machine_is_compatible("fsl,imx6dl"))
1270		return 0;
1271
1272	spi_imx->wml = spi_imx->devtype_data->fifo_size / 2;
1273
1274	/* Prepare for TX DMA: */
1275	master->dma_tx = dma_request_slave_channel_reason(dev, "tx");
1276	if (IS_ERR(master->dma_tx)) {
1277		ret = PTR_ERR(master->dma_tx);
1278		dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret);
1279		master->dma_tx = NULL;
1280		goto err;
1281	}
1282
1283	/* Prepare for RX : */
1284	master->dma_rx = dma_request_slave_channel_reason(dev, "rx");
1285	if (IS_ERR(master->dma_rx)) {
1286		ret = PTR_ERR(master->dma_rx);
1287		dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret);
1288		master->dma_rx = NULL;
1289		goto err;
1290	}
1291
1292	init_completion(&spi_imx->dma_rx_completion);
1293	init_completion(&spi_imx->dma_tx_completion);
1294	master->can_dma = spi_imx_can_dma;
1295	master->max_dma_len = MAX_SDMA_BD_BYTES;
1296	spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX |
1297					 SPI_MASTER_MUST_TX;
1298
1299	return 0;
1300err:
1301	spi_imx_sdma_exit(spi_imx);
1302	return ret;
1303}
1304
1305static void spi_imx_dma_rx_callback(void *cookie)
1306{
1307	struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
1308
1309	complete(&spi_imx->dma_rx_completion);
1310}
1311
1312static void spi_imx_dma_tx_callback(void *cookie)
1313{
1314	struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
1315
1316	complete(&spi_imx->dma_tx_completion);
1317}
1318
1319static int spi_imx_calculate_timeout(struct spi_imx_data *spi_imx, int size)
1320{
1321	unsigned long timeout = 0;
1322
1323	/* Time with actual data transfer and CS change delay related to HW */
1324	timeout = (8 + 4) * size / spi_imx->spi_bus_clk;
1325
1326	/* Add extra second for scheduler related activities */
1327	timeout += 1;
1328
1329	/* Double calculated timeout */
1330	return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC);
1331}
1332
1333static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
1334				struct spi_transfer *transfer)
1335{
1336	struct dma_async_tx_descriptor *desc_tx, *desc_rx;
1337	unsigned long transfer_timeout;
1338	unsigned long timeout;
1339	struct spi_master *master = spi_imx->bitbang.master;
1340	struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
1341	struct scatterlist *last_sg = sg_last(rx->sgl, rx->nents);
1342	unsigned int bytes_per_word, i;
1343	int ret;
1344
1345	/* Get the right burst length from the last sg to ensure no tail data */
1346	bytes_per_word = spi_imx_bytes_per_word(transfer->bits_per_word);
1347	for (i = spi_imx->devtype_data->fifo_size / 2; i > 0; i--) {
1348		if (!(sg_dma_len(last_sg) % (i * bytes_per_word)))
1349			break;
1350	}
1351	/* Use 1 as wml in case no available burst length got */
1352	if (i == 0)
1353		i = 1;
1354
1355	spi_imx->wml =  i;
1356
1357	ret = spi_imx_dma_configure(master);
1358	if (ret)
1359		return ret;
1360
1361	if (!spi_imx->devtype_data->setup_wml) {
1362		dev_err(spi_imx->dev, "No setup_wml()?\n");
1363		return -EINVAL;
 
1364	}
1365	spi_imx->devtype_data->setup_wml(spi_imx);
1366
1367	/*
1368	 * The TX DMA setup starts the transfer, so make sure RX is configured
1369	 * before TX.
1370	 */
1371	desc_rx = dmaengine_prep_slave_sg(master->dma_rx,
1372				rx->sgl, rx->nents, DMA_DEV_TO_MEM,
1373				DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1374	if (!desc_rx)
1375		return -EINVAL;
 
 
1376
1377	desc_rx->callback = spi_imx_dma_rx_callback;
1378	desc_rx->callback_param = (void *)spi_imx;
1379	dmaengine_submit(desc_rx);
1380	reinit_completion(&spi_imx->dma_rx_completion);
1381	dma_async_issue_pending(master->dma_rx);
1382
1383	desc_tx = dmaengine_prep_slave_sg(master->dma_tx,
1384				tx->sgl, tx->nents, DMA_MEM_TO_DEV,
1385				DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1386	if (!desc_tx) {
1387		dmaengine_terminate_all(master->dma_tx);
 
1388		return -EINVAL;
1389	}
1390
1391	desc_tx->callback = spi_imx_dma_tx_callback;
1392	desc_tx->callback_param = (void *)spi_imx;
1393	dmaengine_submit(desc_tx);
1394	reinit_completion(&spi_imx->dma_tx_completion);
1395	dma_async_issue_pending(master->dma_tx);
1396
1397	transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1398
1399	/* Wait SDMA to finish the data transfer.*/
1400	timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
1401						transfer_timeout);
1402	if (!timeout) {
1403		dev_err(spi_imx->dev, "I/O Error in DMA TX\n");
1404		dmaengine_terminate_all(master->dma_tx);
1405		dmaengine_terminate_all(master->dma_rx);
1406		return -ETIMEDOUT;
1407	}
1408
1409	timeout = wait_for_completion_timeout(&spi_imx->dma_rx_completion,
1410					      transfer_timeout);
1411	if (!timeout) {
1412		dev_err(&master->dev, "I/O Error in DMA RX\n");
1413		spi_imx->devtype_data->reset(spi_imx);
1414		dmaengine_terminate_all(master->dma_rx);
1415		return -ETIMEDOUT;
1416	}
1417
1418	return transfer->len;
 
 
 
 
1419}
1420
1421static int spi_imx_pio_transfer(struct spi_device *spi,
1422				struct spi_transfer *transfer)
1423{
1424	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1425	unsigned long transfer_timeout;
1426	unsigned long timeout;
1427
1428	spi_imx->tx_buf = transfer->tx_buf;
1429	spi_imx->rx_buf = transfer->rx_buf;
1430	spi_imx->count = transfer->len;
1431	spi_imx->txfifo = 0;
1432	spi_imx->remainder = 0;
1433
1434	reinit_completion(&spi_imx->xfer_done);
1435
1436	spi_imx_push(spi_imx);
1437
1438	spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE);
1439
1440	transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1441
1442	timeout = wait_for_completion_timeout(&spi_imx->xfer_done,
1443					      transfer_timeout);
1444	if (!timeout) {
1445		dev_err(&spi->dev, "I/O Error in PIO\n");
1446		spi_imx->devtype_data->reset(spi_imx);
1447		return -ETIMEDOUT;
1448	}
1449
1450	return transfer->len;
1451}
1452
1453static int spi_imx_pio_transfer_slave(struct spi_device *spi,
1454				      struct spi_transfer *transfer)
1455{
1456	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1457	int ret = transfer->len;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1458
1459	if (is_imx53_ecspi(spi_imx) &&
1460	    transfer->len > MX53_MAX_TRANSFER_BYTES) {
1461		dev_err(&spi->dev, "Transaction too big, max size is %d bytes\n",
1462			MX53_MAX_TRANSFER_BYTES);
1463		return -EMSGSIZE;
1464	}
1465
1466	spi_imx->tx_buf = transfer->tx_buf;
1467	spi_imx->rx_buf = transfer->rx_buf;
1468	spi_imx->count = transfer->len;
1469	spi_imx->txfifo = 0;
1470	spi_imx->remainder = 0;
1471
1472	reinit_completion(&spi_imx->xfer_done);
1473	spi_imx->slave_aborted = false;
1474
1475	spi_imx_push(spi_imx);
1476
1477	spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE | MXC_INT_RDR);
1478
1479	if (wait_for_completion_interruptible(&spi_imx->xfer_done) ||
1480	    spi_imx->slave_aborted) {
1481		dev_dbg(&spi->dev, "interrupted\n");
1482		ret = -EINTR;
1483	}
1484
1485	/* ecspi has a HW issue when works in Slave mode,
1486	 * after 64 words writtern to TXFIFO, even TXFIFO becomes empty,
1487	 * ECSPI_TXDATA keeps shift out the last word data,
1488	 * so we have to disable ECSPI when in slave mode after the
1489	 * transfer completes
1490	 */
1491	if (spi_imx->devtype_data->disable)
1492		spi_imx->devtype_data->disable(spi_imx);
1493
1494	return ret;
1495}
1496
1497static int spi_imx_transfer(struct spi_device *spi,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1498				struct spi_transfer *transfer)
1499{
1500	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
 
 
 
1501
1502	/* flush rxfifo before transfer */
1503	while (spi_imx->devtype_data->rx_available(spi_imx))
1504		readl(spi_imx->base + MXC_CSPIRXDATA);
1505
1506	if (spi_imx->slave_mode)
1507		return spi_imx_pio_transfer_slave(spi, transfer);
1508
 
 
 
 
 
1509	if (spi_imx->usedma)
1510		return spi_imx_dma_transfer(spi_imx, transfer);
1511	else
1512		return spi_imx_pio_transfer(spi, transfer);
 
 
 
 
 
1513}
1514
1515static int spi_imx_setup(struct spi_device *spi)
1516{
1517	dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__,
1518		 spi->mode, spi->bits_per_word, spi->max_speed_hz);
1519
1520	if (spi->mode & SPI_NO_CS)
1521		return 0;
1522
1523	if (gpio_is_valid(spi->cs_gpio))
1524		gpio_direction_output(spi->cs_gpio,
1525				      spi->mode & SPI_CS_HIGH ? 0 : 1);
1526
1527	spi_imx_chipselect(spi, BITBANG_CS_INACTIVE);
1528
1529	return 0;
1530}
1531
1532static void spi_imx_cleanup(struct spi_device *spi)
1533{
1534}
1535
1536static int
1537spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg)
1538{
1539	struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1540	int ret;
1541
1542	ret = clk_enable(spi_imx->clk_per);
1543	if (ret)
1544		return ret;
1545
1546	ret = clk_enable(spi_imx->clk_ipg);
1547	if (ret) {
1548		clk_disable(spi_imx->clk_per);
1549		return ret;
1550	}
1551
1552	ret = spi_imx->devtype_data->prepare_message(spi_imx, msg);
1553	if (ret) {
1554		clk_disable(spi_imx->clk_ipg);
1555		clk_disable(spi_imx->clk_per);
1556	}
1557
1558	return ret;
1559}
1560
1561static int
1562spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg)
1563{
1564	struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1565
1566	clk_disable(spi_imx->clk_ipg);
1567	clk_disable(spi_imx->clk_per);
1568	return 0;
1569}
1570
1571static int spi_imx_slave_abort(struct spi_master *master)
1572{
1573	struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1574
1575	spi_imx->slave_aborted = true;
1576	complete(&spi_imx->xfer_done);
1577
1578	return 0;
1579}
1580
1581static int spi_imx_probe(struct platform_device *pdev)
1582{
1583	struct device_node *np = pdev->dev.of_node;
1584	const struct of_device_id *of_id =
1585			of_match_device(spi_imx_dt_ids, &pdev->dev);
1586	struct spi_imx_master *mxc_platform_info =
1587			dev_get_platdata(&pdev->dev);
1588	struct spi_master *master;
1589	struct spi_imx_data *spi_imx;
1590	struct resource *res;
1591	int i, ret, irq, spi_drctl;
1592	const struct spi_imx_devtype_data *devtype_data = of_id ? of_id->data :
1593		(struct spi_imx_devtype_data *)pdev->id_entry->driver_data;
1594	bool slave_mode;
1595
1596	if (!np && !mxc_platform_info) {
1597		dev_err(&pdev->dev, "can't get the platform data\n");
1598		return -EINVAL;
1599	}
1600
1601	slave_mode = devtype_data->has_slavemode &&
1602			of_property_read_bool(np, "spi-slave");
1603	if (slave_mode)
1604		master = spi_alloc_slave(&pdev->dev,
1605					 sizeof(struct spi_imx_data));
1606	else
1607		master = spi_alloc_master(&pdev->dev,
1608					  sizeof(struct spi_imx_data));
1609	if (!master)
1610		return -ENOMEM;
1611
1612	ret = of_property_read_u32(np, "fsl,spi-rdy-drctl", &spi_drctl);
1613	if ((ret < 0) || (spi_drctl >= 0x3)) {
1614		/* '11' is reserved */
1615		spi_drctl = 0;
1616	}
1617
1618	platform_set_drvdata(pdev, master);
1619
1620	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
1621	master->bus_num = np ? -1 : pdev->id;
 
1622
1623	spi_imx = spi_master_get_devdata(master);
1624	spi_imx->bitbang.master = master;
1625	spi_imx->dev = &pdev->dev;
1626	spi_imx->slave_mode = slave_mode;
1627
1628	spi_imx->devtype_data = devtype_data;
1629
1630	/* Get number of chip selects, either platform data or OF */
1631	if (mxc_platform_info) {
1632		master->num_chipselect = mxc_platform_info->num_chipselect;
1633		if (mxc_platform_info->chipselect) {
1634			master->cs_gpios = devm_kcalloc(&master->dev,
1635				master->num_chipselect, sizeof(int),
1636				GFP_KERNEL);
1637			if (!master->cs_gpios)
1638				return -ENOMEM;
 
1639
1640			for (i = 0; i < master->num_chipselect; i++)
1641				master->cs_gpios[i] = mxc_platform_info->chipselect[i];
1642		}
1643	} else {
1644		u32 num_cs;
 
 
1645
1646		if (!of_property_read_u32(np, "num-cs", &num_cs))
1647			master->num_chipselect = num_cs;
1648		/* If not preset, default value of 1 is used */
1649	}
1650
1651	spi_imx->bitbang.chipselect = spi_imx_chipselect;
1652	spi_imx->bitbang.setup_transfer = spi_imx_setupxfer;
1653	spi_imx->bitbang.txrx_bufs = spi_imx_transfer;
1654	spi_imx->bitbang.master->setup = spi_imx_setup;
1655	spi_imx->bitbang.master->cleanup = spi_imx_cleanup;
1656	spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message;
1657	spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message;
1658	spi_imx->bitbang.master->slave_abort = spi_imx_slave_abort;
1659	spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \
1660					     | SPI_NO_CS;
1661	if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) ||
1662	    is_imx53_ecspi(spi_imx))
1663		spi_imx->bitbang.master->mode_bits |= SPI_LOOP | SPI_READY;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1664
1665	spi_imx->spi_drctl = spi_drctl;
1666
1667	init_completion(&spi_imx->xfer_done);
1668
1669	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1670	spi_imx->base = devm_ioremap_resource(&pdev->dev, res);
1671	if (IS_ERR(spi_imx->base)) {
1672		ret = PTR_ERR(spi_imx->base);
1673		goto out_master_put;
1674	}
1675	spi_imx->base_phys = res->start;
1676
1677	irq = platform_get_irq(pdev, 0);
1678	if (irq < 0) {
1679		ret = irq;
1680		goto out_master_put;
1681	}
1682
1683	ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0,
1684			       dev_name(&pdev->dev), spi_imx);
1685	if (ret) {
1686		dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
1687		goto out_master_put;
1688	}
1689
1690	spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1691	if (IS_ERR(spi_imx->clk_ipg)) {
1692		ret = PTR_ERR(spi_imx->clk_ipg);
1693		goto out_master_put;
1694	}
1695
1696	spi_imx->clk_per = devm_clk_get(&pdev->dev, "per");
1697	if (IS_ERR(spi_imx->clk_per)) {
1698		ret = PTR_ERR(spi_imx->clk_per);
1699		goto out_master_put;
1700	}
1701
1702	ret = clk_prepare_enable(spi_imx->clk_per);
1703	if (ret)
1704		goto out_master_put;
1705
1706	ret = clk_prepare_enable(spi_imx->clk_ipg);
1707	if (ret)
1708		goto out_put_per;
1709
 
 
 
 
 
 
1710	spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
1711	/*
1712	 * Only validated on i.mx35 and i.mx6 now, can remove the constraint
1713	 * if validated on other chips.
1714	 */
1715	if (spi_imx->devtype_data->has_dmamode) {
1716		ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master);
1717		if (ret == -EPROBE_DEFER)
1718			goto out_clk_put;
1719
1720		if (ret < 0)
1721			dev_err(&pdev->dev, "dma setup error %d, use pio\n",
1722				ret);
1723	}
1724
1725	spi_imx->devtype_data->reset(spi_imx);
1726
1727	spi_imx->devtype_data->intctrl(spi_imx, 0);
1728
1729	master->dev.of_node = pdev->dev.of_node;
1730	ret = spi_bitbang_start(&spi_imx->bitbang);
1731	if (ret) {
1732		dev_err(&pdev->dev, "bitbang start failed with %d\n", ret);
1733		goto out_clk_put;
1734	}
1735
1736	/* Request GPIO CS lines, if any */
1737	if (!spi_imx->slave_mode && master->cs_gpios) {
1738		for (i = 0; i < master->num_chipselect; i++) {
1739			if (!gpio_is_valid(master->cs_gpios[i]))
1740				continue;
1741
1742			ret = devm_gpio_request(&pdev->dev,
1743						master->cs_gpios[i],
1744						DRIVER_NAME);
1745			if (ret) {
1746				dev_err(&pdev->dev, "Can't get CS GPIO %i\n",
1747					master->cs_gpios[i]);
1748				goto out_spi_bitbang;
1749			}
1750		}
1751	}
1752
1753	dev_info(&pdev->dev, "probed\n");
 
1754
1755	clk_disable(spi_imx->clk_ipg);
1756	clk_disable(spi_imx->clk_per);
1757	return ret;
1758
1759out_spi_bitbang:
1760	spi_bitbang_stop(&spi_imx->bitbang);
1761out_clk_put:
 
 
 
 
 
1762	clk_disable_unprepare(spi_imx->clk_ipg);
1763out_put_per:
1764	clk_disable_unprepare(spi_imx->clk_per);
1765out_master_put:
1766	spi_master_put(master);
1767
1768	return ret;
1769}
1770
1771static int spi_imx_remove(struct platform_device *pdev)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1772{
1773	struct spi_master *master = platform_get_drvdata(pdev);
1774	struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1775	int ret;
1776
1777	spi_bitbang_stop(&spi_imx->bitbang);
1778
1779	ret = clk_enable(spi_imx->clk_per);
1780	if (ret)
1781		return ret;
1782
1783	ret = clk_enable(spi_imx->clk_ipg);
1784	if (ret) {
1785		clk_disable(spi_imx->clk_per);
1786		return ret;
1787	}
1788
1789	writel(0, spi_imx->base + MXC_CSPICTRL);
 
 
 
 
 
 
 
 
 
 
1790	clk_disable_unprepare(spi_imx->clk_ipg);
1791	clk_disable_unprepare(spi_imx->clk_per);
1792	spi_imx_sdma_exit(spi_imx);
1793	spi_master_put(master);
1794
1795	return 0;
1796}
1797
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1798static struct platform_driver spi_imx_driver = {
1799	.driver = {
1800		   .name = DRIVER_NAME,
1801		   .of_match_table = spi_imx_dt_ids,
1802		   },
1803	.id_table = spi_imx_devtype,
1804	.probe = spi_imx_probe,
1805	.remove = spi_imx_remove,
1806};
1807module_platform_driver(spi_imx_driver);
1808
1809MODULE_DESCRIPTION("SPI Controller driver");
1810MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1811MODULE_LICENSE("GPL");
1812MODULE_ALIAS("platform:" DRIVER_NAME);