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1// SPDX-License-Identifier: GPL-2.0+
2//
3// Copyright (c) 2009 Samsung Electronics Co., Ltd.
4// Jaswinder Singh <jassi.brar@samsung.com>
5
6#include <linux/init.h>
7#include <linux/module.h>
8#include <linux/interrupt.h>
9#include <linux/delay.h>
10#include <linux/clk.h>
11#include <linux/dma-mapping.h>
12#include <linux/dmaengine.h>
13#include <linux/platform_device.h>
14#include <linux/pm_runtime.h>
15#include <linux/spi/spi.h>
16#include <linux/of.h>
17
18#include <linux/platform_data/spi-s3c64xx.h>
19
20#define MAX_SPI_PORTS 12
21#define S3C64XX_SPI_QUIRK_CS_AUTO (1 << 1)
22#define AUTOSUSPEND_TIMEOUT 2000
23
24/* Registers and bit-fields */
25
26#define S3C64XX_SPI_CH_CFG 0x00
27#define S3C64XX_SPI_CLK_CFG 0x04
28#define S3C64XX_SPI_MODE_CFG 0x08
29#define S3C64XX_SPI_CS_REG 0x0C
30#define S3C64XX_SPI_INT_EN 0x10
31#define S3C64XX_SPI_STATUS 0x14
32#define S3C64XX_SPI_TX_DATA 0x18
33#define S3C64XX_SPI_RX_DATA 0x1C
34#define S3C64XX_SPI_PACKET_CNT 0x20
35#define S3C64XX_SPI_PENDING_CLR 0x24
36#define S3C64XX_SPI_SWAP_CFG 0x28
37#define S3C64XX_SPI_FB_CLK 0x2C
38
39#define S3C64XX_SPI_CH_HS_EN (1<<6) /* High Speed Enable */
40#define S3C64XX_SPI_CH_SW_RST (1<<5)
41#define S3C64XX_SPI_CH_SLAVE (1<<4)
42#define S3C64XX_SPI_CPOL_L (1<<3)
43#define S3C64XX_SPI_CPHA_B (1<<2)
44#define S3C64XX_SPI_CH_RXCH_ON (1<<1)
45#define S3C64XX_SPI_CH_TXCH_ON (1<<0)
46
47#define S3C64XX_SPI_CLKSEL_SRCMSK (3<<9)
48#define S3C64XX_SPI_CLKSEL_SRCSHFT 9
49#define S3C64XX_SPI_ENCLK_ENABLE (1<<8)
50#define S3C64XX_SPI_PSR_MASK 0xff
51
52#define S3C64XX_SPI_MODE_CH_TSZ_BYTE (0<<29)
53#define S3C64XX_SPI_MODE_CH_TSZ_HALFWORD (1<<29)
54#define S3C64XX_SPI_MODE_CH_TSZ_WORD (2<<29)
55#define S3C64XX_SPI_MODE_CH_TSZ_MASK (3<<29)
56#define S3C64XX_SPI_MODE_BUS_TSZ_BYTE (0<<17)
57#define S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD (1<<17)
58#define S3C64XX_SPI_MODE_BUS_TSZ_WORD (2<<17)
59#define S3C64XX_SPI_MODE_BUS_TSZ_MASK (3<<17)
60#define S3C64XX_SPI_MODE_RX_RDY_LVL GENMASK(16, 11)
61#define S3C64XX_SPI_MODE_RX_RDY_LVL_SHIFT 11
62#define S3C64XX_SPI_MODE_SELF_LOOPBACK (1<<3)
63#define S3C64XX_SPI_MODE_RXDMA_ON (1<<2)
64#define S3C64XX_SPI_MODE_TXDMA_ON (1<<1)
65#define S3C64XX_SPI_MODE_4BURST (1<<0)
66
67#define S3C64XX_SPI_CS_NSC_CNT_2 (2<<4)
68#define S3C64XX_SPI_CS_AUTO (1<<1)
69#define S3C64XX_SPI_CS_SIG_INACT (1<<0)
70
71#define S3C64XX_SPI_INT_TRAILING_EN (1<<6)
72#define S3C64XX_SPI_INT_RX_OVERRUN_EN (1<<5)
73#define S3C64XX_SPI_INT_RX_UNDERRUN_EN (1<<4)
74#define S3C64XX_SPI_INT_TX_OVERRUN_EN (1<<3)
75#define S3C64XX_SPI_INT_TX_UNDERRUN_EN (1<<2)
76#define S3C64XX_SPI_INT_RX_FIFORDY_EN (1<<1)
77#define S3C64XX_SPI_INT_TX_FIFORDY_EN (1<<0)
78
79#define S3C64XX_SPI_ST_RX_OVERRUN_ERR (1<<5)
80#define S3C64XX_SPI_ST_RX_UNDERRUN_ERR (1<<4)
81#define S3C64XX_SPI_ST_TX_OVERRUN_ERR (1<<3)
82#define S3C64XX_SPI_ST_TX_UNDERRUN_ERR (1<<2)
83#define S3C64XX_SPI_ST_RX_FIFORDY (1<<1)
84#define S3C64XX_SPI_ST_TX_FIFORDY (1<<0)
85
86#define S3C64XX_SPI_PACKET_CNT_EN (1<<16)
87#define S3C64XX_SPI_PACKET_CNT_MASK GENMASK(15, 0)
88
89#define S3C64XX_SPI_PND_TX_UNDERRUN_CLR (1<<4)
90#define S3C64XX_SPI_PND_TX_OVERRUN_CLR (1<<3)
91#define S3C64XX_SPI_PND_RX_UNDERRUN_CLR (1<<2)
92#define S3C64XX_SPI_PND_RX_OVERRUN_CLR (1<<1)
93#define S3C64XX_SPI_PND_TRAILING_CLR (1<<0)
94
95#define S3C64XX_SPI_SWAP_RX_HALF_WORD (1<<7)
96#define S3C64XX_SPI_SWAP_RX_BYTE (1<<6)
97#define S3C64XX_SPI_SWAP_RX_BIT (1<<5)
98#define S3C64XX_SPI_SWAP_RX_EN (1<<4)
99#define S3C64XX_SPI_SWAP_TX_HALF_WORD (1<<3)
100#define S3C64XX_SPI_SWAP_TX_BYTE (1<<2)
101#define S3C64XX_SPI_SWAP_TX_BIT (1<<1)
102#define S3C64XX_SPI_SWAP_TX_EN (1<<0)
103
104#define S3C64XX_SPI_FBCLK_MSK (3<<0)
105
106#define FIFO_LVL_MASK(i) ((i)->port_conf->fifo_lvl_mask[i->port_id])
107#define S3C64XX_SPI_ST_TX_DONE(v, i) (((v) & \
108 (1 << (i)->port_conf->tx_st_done)) ? 1 : 0)
109#define TX_FIFO_LVL(v, i) (((v) >> 6) & FIFO_LVL_MASK(i))
110#define RX_FIFO_LVL(v, i) (((v) >> (i)->port_conf->rx_lvl_offset) & \
111 FIFO_LVL_MASK(i))
112
113#define S3C64XX_SPI_MAX_TRAILCNT 0x3ff
114#define S3C64XX_SPI_TRAILCNT_OFF 19
115
116#define S3C64XX_SPI_TRAILCNT S3C64XX_SPI_MAX_TRAILCNT
117
118#define S3C64XX_SPI_POLLING_SIZE 32
119
120#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
121#define is_polling(x) (x->cntrlr_info->polling)
122
123#define RXBUSY (1<<2)
124#define TXBUSY (1<<3)
125
126struct s3c64xx_spi_dma_data {
127 struct dma_chan *ch;
128 dma_cookie_t cookie;
129 enum dma_transfer_direction direction;
130};
131
132/**
133 * struct s3c64xx_spi_port_config - SPI Controller hardware info
134 * @fifo_lvl_mask: Bit-mask for {TX|RX}_FIFO_LVL bits in SPI_STATUS register.
135 * @rx_lvl_offset: Bit offset of RX_FIFO_LVL bits in SPI_STATUS regiter.
136 * @tx_st_done: Bit offset of TX_DONE bit in SPI_STATUS regiter.
137 * @clk_div: Internal clock divider
138 * @quirks: Bitmask of known quirks
139 * @high_speed: True, if the controller supports HIGH_SPEED_EN bit.
140 * @clk_from_cmu: True, if the controller does not include a clock mux and
141 * prescaler unit.
142 * @clk_ioclk: True if clock is present on this device
143 * @has_loopback: True if loopback mode can be supported
144 *
145 * The Samsung s3c64xx SPI controller are used on various Samsung SoC's but
146 * differ in some aspects such as the size of the fifo and spi bus clock
147 * setup. Such differences are specified to the driver using this structure
148 * which is provided as driver data to the driver.
149 */
150struct s3c64xx_spi_port_config {
151 int fifo_lvl_mask[MAX_SPI_PORTS];
152 int rx_lvl_offset;
153 int tx_st_done;
154 int quirks;
155 int clk_div;
156 bool high_speed;
157 bool clk_from_cmu;
158 bool clk_ioclk;
159 bool has_loopback;
160};
161
162/**
163 * struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver.
164 * @clk: Pointer to the spi clock.
165 * @src_clk: Pointer to the clock used to generate SPI signals.
166 * @ioclk: Pointer to the i/o clock between host and target
167 * @pdev: Pointer to device's platform device data
168 * @host: Pointer to the SPI Protocol host.
169 * @cntrlr_info: Platform specific data for the controller this driver manages.
170 * @lock: Controller specific lock.
171 * @state: Set of FLAGS to indicate status.
172 * @sfr_start: BUS address of SPI controller regs.
173 * @regs: Pointer to ioremap'ed controller registers.
174 * @xfer_completion: To indicate completion of xfer task.
175 * @cur_mode: Stores the active configuration of the controller.
176 * @cur_bpw: Stores the active bits per word settings.
177 * @cur_speed: Current clock speed
178 * @rx_dma: Local receive DMA data (e.g. chan and direction)
179 * @tx_dma: Local transmit DMA data (e.g. chan and direction)
180 * @port_conf: Local SPI port configuartion data
181 * @port_id: Port identification number
182 */
183struct s3c64xx_spi_driver_data {
184 void __iomem *regs;
185 struct clk *clk;
186 struct clk *src_clk;
187 struct clk *ioclk;
188 struct platform_device *pdev;
189 struct spi_controller *host;
190 struct s3c64xx_spi_info *cntrlr_info;
191 spinlock_t lock;
192 unsigned long sfr_start;
193 struct completion xfer_completion;
194 unsigned state;
195 unsigned cur_mode, cur_bpw;
196 unsigned cur_speed;
197 struct s3c64xx_spi_dma_data rx_dma;
198 struct s3c64xx_spi_dma_data tx_dma;
199 const struct s3c64xx_spi_port_config *port_conf;
200 unsigned int port_id;
201};
202
203static void s3c64xx_flush_fifo(struct s3c64xx_spi_driver_data *sdd)
204{
205 void __iomem *regs = sdd->regs;
206 unsigned long loops;
207 u32 val;
208
209 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
210
211 val = readl(regs + S3C64XX_SPI_CH_CFG);
212 val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON);
213 writel(val, regs + S3C64XX_SPI_CH_CFG);
214
215 val = readl(regs + S3C64XX_SPI_CH_CFG);
216 val |= S3C64XX_SPI_CH_SW_RST;
217 val &= ~S3C64XX_SPI_CH_HS_EN;
218 writel(val, regs + S3C64XX_SPI_CH_CFG);
219
220 /* Flush TxFIFO*/
221 loops = msecs_to_loops(1);
222 do {
223 val = readl(regs + S3C64XX_SPI_STATUS);
224 } while (TX_FIFO_LVL(val, sdd) && loops--);
225
226 if (loops == 0)
227 dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n");
228
229 /* Flush RxFIFO*/
230 loops = msecs_to_loops(1);
231 do {
232 val = readl(regs + S3C64XX_SPI_STATUS);
233 if (RX_FIFO_LVL(val, sdd))
234 readl(regs + S3C64XX_SPI_RX_DATA);
235 else
236 break;
237 } while (loops--);
238
239 if (loops == 0)
240 dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n");
241
242 val = readl(regs + S3C64XX_SPI_CH_CFG);
243 val &= ~S3C64XX_SPI_CH_SW_RST;
244 writel(val, regs + S3C64XX_SPI_CH_CFG);
245
246 val = readl(regs + S3C64XX_SPI_MODE_CFG);
247 val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
248 writel(val, regs + S3C64XX_SPI_MODE_CFG);
249}
250
251static void s3c64xx_spi_dmacb(void *data)
252{
253 struct s3c64xx_spi_driver_data *sdd;
254 struct s3c64xx_spi_dma_data *dma = data;
255 unsigned long flags;
256
257 if (dma->direction == DMA_DEV_TO_MEM)
258 sdd = container_of(data,
259 struct s3c64xx_spi_driver_data, rx_dma);
260 else
261 sdd = container_of(data,
262 struct s3c64xx_spi_driver_data, tx_dma);
263
264 spin_lock_irqsave(&sdd->lock, flags);
265
266 if (dma->direction == DMA_DEV_TO_MEM) {
267 sdd->state &= ~RXBUSY;
268 if (!(sdd->state & TXBUSY))
269 complete(&sdd->xfer_completion);
270 } else {
271 sdd->state &= ~TXBUSY;
272 if (!(sdd->state & RXBUSY))
273 complete(&sdd->xfer_completion);
274 }
275
276 spin_unlock_irqrestore(&sdd->lock, flags);
277}
278
279static int prepare_dma(struct s3c64xx_spi_dma_data *dma,
280 struct sg_table *sgt)
281{
282 struct s3c64xx_spi_driver_data *sdd;
283 struct dma_slave_config config;
284 struct dma_async_tx_descriptor *desc;
285 int ret;
286
287 memset(&config, 0, sizeof(config));
288
289 if (dma->direction == DMA_DEV_TO_MEM) {
290 sdd = container_of((void *)dma,
291 struct s3c64xx_spi_driver_data, rx_dma);
292 config.direction = dma->direction;
293 config.src_addr = sdd->sfr_start + S3C64XX_SPI_RX_DATA;
294 config.src_addr_width = sdd->cur_bpw / 8;
295 config.src_maxburst = 1;
296 dmaengine_slave_config(dma->ch, &config);
297 } else {
298 sdd = container_of((void *)dma,
299 struct s3c64xx_spi_driver_data, tx_dma);
300 config.direction = dma->direction;
301 config.dst_addr = sdd->sfr_start + S3C64XX_SPI_TX_DATA;
302 config.dst_addr_width = sdd->cur_bpw / 8;
303 config.dst_maxburst = 1;
304 dmaengine_slave_config(dma->ch, &config);
305 }
306
307 desc = dmaengine_prep_slave_sg(dma->ch, sgt->sgl, sgt->nents,
308 dma->direction, DMA_PREP_INTERRUPT);
309 if (!desc) {
310 dev_err(&sdd->pdev->dev, "unable to prepare %s scatterlist",
311 dma->direction == DMA_DEV_TO_MEM ? "rx" : "tx");
312 return -ENOMEM;
313 }
314
315 desc->callback = s3c64xx_spi_dmacb;
316 desc->callback_param = dma;
317
318 dma->cookie = dmaengine_submit(desc);
319 ret = dma_submit_error(dma->cookie);
320 if (ret) {
321 dev_err(&sdd->pdev->dev, "DMA submission failed");
322 return -EIO;
323 }
324
325 dma_async_issue_pending(dma->ch);
326 return 0;
327}
328
329static void s3c64xx_spi_set_cs(struct spi_device *spi, bool enable)
330{
331 struct s3c64xx_spi_driver_data *sdd =
332 spi_controller_get_devdata(spi->controller);
333
334 if (sdd->cntrlr_info->no_cs)
335 return;
336
337 if (enable) {
338 if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO)) {
339 writel(0, sdd->regs + S3C64XX_SPI_CS_REG);
340 } else {
341 u32 ssel = readl(sdd->regs + S3C64XX_SPI_CS_REG);
342
343 ssel |= (S3C64XX_SPI_CS_AUTO |
344 S3C64XX_SPI_CS_NSC_CNT_2);
345 writel(ssel, sdd->regs + S3C64XX_SPI_CS_REG);
346 }
347 } else {
348 if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
349 writel(S3C64XX_SPI_CS_SIG_INACT,
350 sdd->regs + S3C64XX_SPI_CS_REG);
351 }
352}
353
354static int s3c64xx_spi_prepare_transfer(struct spi_controller *spi)
355{
356 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(spi);
357
358 if (is_polling(sdd))
359 return 0;
360
361 /* Requests DMA channels */
362 sdd->rx_dma.ch = dma_request_chan(&sdd->pdev->dev, "rx");
363 if (IS_ERR(sdd->rx_dma.ch)) {
364 dev_err(&sdd->pdev->dev, "Failed to get RX DMA channel\n");
365 sdd->rx_dma.ch = NULL;
366 return 0;
367 }
368
369 sdd->tx_dma.ch = dma_request_chan(&sdd->pdev->dev, "tx");
370 if (IS_ERR(sdd->tx_dma.ch)) {
371 dev_err(&sdd->pdev->dev, "Failed to get TX DMA channel\n");
372 dma_release_channel(sdd->rx_dma.ch);
373 sdd->tx_dma.ch = NULL;
374 sdd->rx_dma.ch = NULL;
375 return 0;
376 }
377
378 spi->dma_rx = sdd->rx_dma.ch;
379 spi->dma_tx = sdd->tx_dma.ch;
380
381 return 0;
382}
383
384static int s3c64xx_spi_unprepare_transfer(struct spi_controller *spi)
385{
386 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(spi);
387
388 if (is_polling(sdd))
389 return 0;
390
391 /* Releases DMA channels if they are allocated */
392 if (sdd->rx_dma.ch && sdd->tx_dma.ch) {
393 dma_release_channel(sdd->rx_dma.ch);
394 dma_release_channel(sdd->tx_dma.ch);
395 sdd->rx_dma.ch = NULL;
396 sdd->tx_dma.ch = NULL;
397 }
398
399 return 0;
400}
401
402static bool s3c64xx_spi_can_dma(struct spi_controller *host,
403 struct spi_device *spi,
404 struct spi_transfer *xfer)
405{
406 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
407
408 if (sdd->rx_dma.ch && sdd->tx_dma.ch) {
409 return xfer->len > (FIFO_LVL_MASK(sdd) >> 1) + 1;
410 } else {
411 return false;
412 }
413
414}
415
416static int s3c64xx_enable_datapath(struct s3c64xx_spi_driver_data *sdd,
417 struct spi_transfer *xfer, int dma_mode)
418{
419 void __iomem *regs = sdd->regs;
420 u32 modecfg, chcfg;
421 int ret = 0;
422
423 modecfg = readl(regs + S3C64XX_SPI_MODE_CFG);
424 modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
425
426 chcfg = readl(regs + S3C64XX_SPI_CH_CFG);
427 chcfg &= ~S3C64XX_SPI_CH_TXCH_ON;
428
429 if (dma_mode) {
430 chcfg &= ~S3C64XX_SPI_CH_RXCH_ON;
431 } else {
432 /* Always shift in data in FIFO, even if xfer is Tx only,
433 * this helps setting PCKT_CNT value for generating clocks
434 * as exactly needed.
435 */
436 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
437 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
438 | S3C64XX_SPI_PACKET_CNT_EN,
439 regs + S3C64XX_SPI_PACKET_CNT);
440 }
441
442 if (xfer->tx_buf != NULL) {
443 sdd->state |= TXBUSY;
444 chcfg |= S3C64XX_SPI_CH_TXCH_ON;
445 if (dma_mode) {
446 modecfg |= S3C64XX_SPI_MODE_TXDMA_ON;
447 ret = prepare_dma(&sdd->tx_dma, &xfer->tx_sg);
448 } else {
449 switch (sdd->cur_bpw) {
450 case 32:
451 iowrite32_rep(regs + S3C64XX_SPI_TX_DATA,
452 xfer->tx_buf, xfer->len / 4);
453 break;
454 case 16:
455 iowrite16_rep(regs + S3C64XX_SPI_TX_DATA,
456 xfer->tx_buf, xfer->len / 2);
457 break;
458 default:
459 iowrite8_rep(regs + S3C64XX_SPI_TX_DATA,
460 xfer->tx_buf, xfer->len);
461 break;
462 }
463 }
464 }
465
466 if (xfer->rx_buf != NULL) {
467 sdd->state |= RXBUSY;
468
469 if (sdd->port_conf->high_speed && sdd->cur_speed >= 30000000UL
470 && !(sdd->cur_mode & SPI_CPHA))
471 chcfg |= S3C64XX_SPI_CH_HS_EN;
472
473 if (dma_mode) {
474 modecfg |= S3C64XX_SPI_MODE_RXDMA_ON;
475 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
476 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
477 | S3C64XX_SPI_PACKET_CNT_EN,
478 regs + S3C64XX_SPI_PACKET_CNT);
479 ret = prepare_dma(&sdd->rx_dma, &xfer->rx_sg);
480 }
481 }
482
483 if (ret)
484 return ret;
485
486 writel(modecfg, regs + S3C64XX_SPI_MODE_CFG);
487 writel(chcfg, regs + S3C64XX_SPI_CH_CFG);
488
489 return 0;
490}
491
492static u32 s3c64xx_spi_wait_for_timeout(struct s3c64xx_spi_driver_data *sdd,
493 int timeout_ms)
494{
495 void __iomem *regs = sdd->regs;
496 unsigned long val = 1;
497 u32 status;
498
499 /* max fifo depth available */
500 u32 max_fifo = (FIFO_LVL_MASK(sdd) >> 1) + 1;
501
502 if (timeout_ms)
503 val = msecs_to_loops(timeout_ms);
504
505 do {
506 status = readl(regs + S3C64XX_SPI_STATUS);
507 } while (RX_FIFO_LVL(status, sdd) < max_fifo && --val);
508
509 /* return the actual received data length */
510 return RX_FIFO_LVL(status, sdd);
511}
512
513static int s3c64xx_wait_for_dma(struct s3c64xx_spi_driver_data *sdd,
514 struct spi_transfer *xfer)
515{
516 void __iomem *regs = sdd->regs;
517 unsigned long val;
518 u32 status;
519 int ms;
520
521 /* millisecs to xfer 'len' bytes @ 'cur_speed' */
522 ms = xfer->len * 8 * 1000 / sdd->cur_speed;
523 ms += 30; /* some tolerance */
524 ms = max(ms, 100); /* minimum timeout */
525
526 val = msecs_to_jiffies(ms) + 10;
527 val = wait_for_completion_timeout(&sdd->xfer_completion, val);
528
529 /*
530 * If the previous xfer was completed within timeout, then
531 * proceed further else return -EIO.
532 * DmaTx returns after simply writing data in the FIFO,
533 * w/o waiting for real transmission on the bus to finish.
534 * DmaRx returns only after Dma read data from FIFO which
535 * needs bus transmission to finish, so we don't worry if
536 * Xfer involved Rx(with or without Tx).
537 */
538 if (val && !xfer->rx_buf) {
539 val = msecs_to_loops(10);
540 status = readl(regs + S3C64XX_SPI_STATUS);
541 while ((TX_FIFO_LVL(status, sdd)
542 || !S3C64XX_SPI_ST_TX_DONE(status, sdd))
543 && --val) {
544 cpu_relax();
545 status = readl(regs + S3C64XX_SPI_STATUS);
546 }
547
548 }
549
550 /* If timed out while checking rx/tx status return error */
551 if (!val)
552 return -EIO;
553
554 return 0;
555}
556
557static int s3c64xx_wait_for_pio(struct s3c64xx_spi_driver_data *sdd,
558 struct spi_transfer *xfer, bool use_irq)
559{
560 void __iomem *regs = sdd->regs;
561 unsigned long val;
562 u32 status;
563 int loops;
564 u32 cpy_len;
565 u8 *buf;
566 int ms;
567 unsigned long time_us;
568
569 /* microsecs to xfer 'len' bytes @ 'cur_speed' */
570 time_us = (xfer->len * 8 * 1000 * 1000) / sdd->cur_speed;
571 ms = (time_us / 1000);
572 ms += 10; /* some tolerance */
573
574 /* sleep during signal transfer time */
575 status = readl(regs + S3C64XX_SPI_STATUS);
576 if (RX_FIFO_LVL(status, sdd) < xfer->len)
577 usleep_range(time_us / 2, time_us);
578
579 if (use_irq) {
580 val = msecs_to_jiffies(ms);
581 if (!wait_for_completion_timeout(&sdd->xfer_completion, val))
582 return -EIO;
583 }
584
585 val = msecs_to_loops(ms);
586 do {
587 status = readl(regs + S3C64XX_SPI_STATUS);
588 } while (RX_FIFO_LVL(status, sdd) < xfer->len && --val);
589
590 if (!val)
591 return -EIO;
592
593 /* If it was only Tx */
594 if (!xfer->rx_buf) {
595 sdd->state &= ~TXBUSY;
596 return 0;
597 }
598
599 /*
600 * If the receive length is bigger than the controller fifo
601 * size, calculate the loops and read the fifo as many times.
602 * loops = length / max fifo size (calculated by using the
603 * fifo mask).
604 * For any size less than the fifo size the below code is
605 * executed atleast once.
606 */
607 loops = xfer->len / ((FIFO_LVL_MASK(sdd) >> 1) + 1);
608 buf = xfer->rx_buf;
609 do {
610 /* wait for data to be received in the fifo */
611 cpy_len = s3c64xx_spi_wait_for_timeout(sdd,
612 (loops ? ms : 0));
613
614 switch (sdd->cur_bpw) {
615 case 32:
616 ioread32_rep(regs + S3C64XX_SPI_RX_DATA,
617 buf, cpy_len / 4);
618 break;
619 case 16:
620 ioread16_rep(regs + S3C64XX_SPI_RX_DATA,
621 buf, cpy_len / 2);
622 break;
623 default:
624 ioread8_rep(regs + S3C64XX_SPI_RX_DATA,
625 buf, cpy_len);
626 break;
627 }
628
629 buf = buf + cpy_len;
630 } while (loops--);
631 sdd->state &= ~RXBUSY;
632
633 return 0;
634}
635
636static int s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
637{
638 void __iomem *regs = sdd->regs;
639 int ret;
640 u32 val;
641 int div = sdd->port_conf->clk_div;
642
643 /* Disable Clock */
644 if (!sdd->port_conf->clk_from_cmu) {
645 val = readl(regs + S3C64XX_SPI_CLK_CFG);
646 val &= ~S3C64XX_SPI_ENCLK_ENABLE;
647 writel(val, regs + S3C64XX_SPI_CLK_CFG);
648 }
649
650 /* Set Polarity and Phase */
651 val = readl(regs + S3C64XX_SPI_CH_CFG);
652 val &= ~(S3C64XX_SPI_CH_SLAVE |
653 S3C64XX_SPI_CPOL_L |
654 S3C64XX_SPI_CPHA_B);
655
656 if (sdd->cur_mode & SPI_CPOL)
657 val |= S3C64XX_SPI_CPOL_L;
658
659 if (sdd->cur_mode & SPI_CPHA)
660 val |= S3C64XX_SPI_CPHA_B;
661
662 writel(val, regs + S3C64XX_SPI_CH_CFG);
663
664 /* Set Channel & DMA Mode */
665 val = readl(regs + S3C64XX_SPI_MODE_CFG);
666 val &= ~(S3C64XX_SPI_MODE_BUS_TSZ_MASK
667 | S3C64XX_SPI_MODE_CH_TSZ_MASK);
668
669 switch (sdd->cur_bpw) {
670 case 32:
671 val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD;
672 val |= S3C64XX_SPI_MODE_CH_TSZ_WORD;
673 break;
674 case 16:
675 val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD;
676 val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD;
677 break;
678 default:
679 val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE;
680 val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE;
681 break;
682 }
683
684 if ((sdd->cur_mode & SPI_LOOP) && sdd->port_conf->has_loopback)
685 val |= S3C64XX_SPI_MODE_SELF_LOOPBACK;
686 else
687 val &= ~S3C64XX_SPI_MODE_SELF_LOOPBACK;
688
689 writel(val, regs + S3C64XX_SPI_MODE_CFG);
690
691 if (sdd->port_conf->clk_from_cmu) {
692 ret = clk_set_rate(sdd->src_clk, sdd->cur_speed * div);
693 if (ret)
694 return ret;
695 sdd->cur_speed = clk_get_rate(sdd->src_clk) / div;
696 } else {
697 /* Configure Clock */
698 val = readl(regs + S3C64XX_SPI_CLK_CFG);
699 val &= ~S3C64XX_SPI_PSR_MASK;
700 val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / div - 1)
701 & S3C64XX_SPI_PSR_MASK);
702 writel(val, regs + S3C64XX_SPI_CLK_CFG);
703
704 /* Enable Clock */
705 val = readl(regs + S3C64XX_SPI_CLK_CFG);
706 val |= S3C64XX_SPI_ENCLK_ENABLE;
707 writel(val, regs + S3C64XX_SPI_CLK_CFG);
708 }
709
710 return 0;
711}
712
713#define XFER_DMAADDR_INVALID DMA_BIT_MASK(32)
714
715static int s3c64xx_spi_prepare_message(struct spi_controller *host,
716 struct spi_message *msg)
717{
718 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
719 struct spi_device *spi = msg->spi;
720 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
721
722 /* Configure feedback delay */
723 if (!cs)
724 /* No delay if not defined */
725 writel(0, sdd->regs + S3C64XX_SPI_FB_CLK);
726 else
727 writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK);
728
729 return 0;
730}
731
732static size_t s3c64xx_spi_max_transfer_size(struct spi_device *spi)
733{
734 struct spi_controller *ctlr = spi->controller;
735
736 return ctlr->can_dma ? S3C64XX_SPI_PACKET_CNT_MASK : SIZE_MAX;
737}
738
739static int s3c64xx_spi_transfer_one(struct spi_controller *host,
740 struct spi_device *spi,
741 struct spi_transfer *xfer)
742{
743 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
744 const unsigned int fifo_len = (FIFO_LVL_MASK(sdd) >> 1) + 1;
745 const void *tx_buf = NULL;
746 void *rx_buf = NULL;
747 int target_len = 0, origin_len = 0;
748 int use_dma = 0;
749 bool use_irq = false;
750 int status;
751 u32 speed;
752 u8 bpw;
753 unsigned long flags;
754 u32 rdy_lv;
755 u32 val;
756
757 reinit_completion(&sdd->xfer_completion);
758
759 /* Only BPW and Speed may change across transfers */
760 bpw = xfer->bits_per_word;
761 speed = xfer->speed_hz;
762
763 if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) {
764 sdd->cur_bpw = bpw;
765 sdd->cur_speed = speed;
766 sdd->cur_mode = spi->mode;
767 status = s3c64xx_spi_config(sdd);
768 if (status)
769 return status;
770 }
771
772 if (!is_polling(sdd) && (xfer->len > fifo_len) &&
773 sdd->rx_dma.ch && sdd->tx_dma.ch) {
774 use_dma = 1;
775
776 } else if (xfer->len >= fifo_len) {
777 tx_buf = xfer->tx_buf;
778 rx_buf = xfer->rx_buf;
779 origin_len = xfer->len;
780 target_len = xfer->len;
781 xfer->len = fifo_len - 1;
782 }
783
784 do {
785 /* transfer size is greater than 32, change to IRQ mode */
786 if (!use_dma && xfer->len > S3C64XX_SPI_POLLING_SIZE)
787 use_irq = true;
788
789 if (use_irq) {
790 reinit_completion(&sdd->xfer_completion);
791
792 rdy_lv = xfer->len;
793 /* Setup RDY_FIFO trigger Level
794 * RDY_LVL =
795 * fifo_lvl up to 64 byte -> N bytes
796 * 128 byte -> RDY_LVL * 2 bytes
797 * 256 byte -> RDY_LVL * 4 bytes
798 */
799 if (fifo_len == 128)
800 rdy_lv /= 2;
801 else if (fifo_len == 256)
802 rdy_lv /= 4;
803
804 val = readl(sdd->regs + S3C64XX_SPI_MODE_CFG);
805 val &= ~S3C64XX_SPI_MODE_RX_RDY_LVL;
806 val |= (rdy_lv << S3C64XX_SPI_MODE_RX_RDY_LVL_SHIFT);
807 writel(val, sdd->regs + S3C64XX_SPI_MODE_CFG);
808
809 /* Enable FIFO_RDY_EN IRQ */
810 val = readl(sdd->regs + S3C64XX_SPI_INT_EN);
811 writel((val | S3C64XX_SPI_INT_RX_FIFORDY_EN),
812 sdd->regs + S3C64XX_SPI_INT_EN);
813
814 }
815
816 spin_lock_irqsave(&sdd->lock, flags);
817
818 /* Pending only which is to be done */
819 sdd->state &= ~RXBUSY;
820 sdd->state &= ~TXBUSY;
821
822 /* Start the signals */
823 s3c64xx_spi_set_cs(spi, true);
824
825 status = s3c64xx_enable_datapath(sdd, xfer, use_dma);
826
827 spin_unlock_irqrestore(&sdd->lock, flags);
828
829 if (status) {
830 dev_err(&spi->dev, "failed to enable data path for transfer: %d\n", status);
831 break;
832 }
833
834 if (use_dma)
835 status = s3c64xx_wait_for_dma(sdd, xfer);
836 else
837 status = s3c64xx_wait_for_pio(sdd, xfer, use_irq);
838
839 if (status) {
840 dev_err(&spi->dev,
841 "I/O Error: rx-%d tx-%d rx-%c tx-%c len-%d dma-%d res-(%d)\n",
842 xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
843 (sdd->state & RXBUSY) ? 'f' : 'p',
844 (sdd->state & TXBUSY) ? 'f' : 'p',
845 xfer->len, use_dma ? 1 : 0, status);
846
847 if (use_dma) {
848 struct dma_tx_state s;
849
850 if (xfer->tx_buf && (sdd->state & TXBUSY)) {
851 dmaengine_pause(sdd->tx_dma.ch);
852 dmaengine_tx_status(sdd->tx_dma.ch, sdd->tx_dma.cookie, &s);
853 dmaengine_terminate_all(sdd->tx_dma.ch);
854 dev_err(&spi->dev, "TX residue: %d\n", s.residue);
855
856 }
857 if (xfer->rx_buf && (sdd->state & RXBUSY)) {
858 dmaengine_pause(sdd->rx_dma.ch);
859 dmaengine_tx_status(sdd->rx_dma.ch, sdd->rx_dma.cookie, &s);
860 dmaengine_terminate_all(sdd->rx_dma.ch);
861 dev_err(&spi->dev, "RX residue: %d\n", s.residue);
862 }
863 }
864 } else {
865 s3c64xx_flush_fifo(sdd);
866 }
867 if (target_len > 0) {
868 target_len -= xfer->len;
869
870 if (xfer->tx_buf)
871 xfer->tx_buf += xfer->len;
872
873 if (xfer->rx_buf)
874 xfer->rx_buf += xfer->len;
875
876 if (target_len >= fifo_len)
877 xfer->len = fifo_len - 1;
878 else
879 xfer->len = target_len;
880 }
881 } while (target_len > 0);
882
883 if (origin_len) {
884 /* Restore original xfer buffers and length */
885 xfer->tx_buf = tx_buf;
886 xfer->rx_buf = rx_buf;
887 xfer->len = origin_len;
888 }
889
890 return status;
891}
892
893static struct s3c64xx_spi_csinfo *s3c64xx_get_target_ctrldata(
894 struct spi_device *spi)
895{
896 struct s3c64xx_spi_csinfo *cs;
897 struct device_node *target_np, *data_np = NULL;
898 u32 fb_delay = 0;
899
900 target_np = spi->dev.of_node;
901 if (!target_np) {
902 dev_err(&spi->dev, "device node not found\n");
903 return ERR_PTR(-EINVAL);
904 }
905
906 cs = kzalloc(sizeof(*cs), GFP_KERNEL);
907 if (!cs)
908 return ERR_PTR(-ENOMEM);
909
910 data_np = of_get_child_by_name(target_np, "controller-data");
911 if (!data_np) {
912 dev_info(&spi->dev, "feedback delay set to default (0)\n");
913 return cs;
914 }
915
916 of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay);
917 cs->fb_delay = fb_delay;
918 of_node_put(data_np);
919 return cs;
920}
921
922/*
923 * Here we only check the validity of requested configuration
924 * and save the configuration in a local data-structure.
925 * The controller is actually configured only just before we
926 * get a message to transfer.
927 */
928static int s3c64xx_spi_setup(struct spi_device *spi)
929{
930 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
931 struct s3c64xx_spi_driver_data *sdd;
932 int err;
933 int div;
934
935 sdd = spi_controller_get_devdata(spi->controller);
936 if (spi->dev.of_node) {
937 cs = s3c64xx_get_target_ctrldata(spi);
938 spi->controller_data = cs;
939 }
940
941 /* NULL is fine, we just avoid using the FB delay (=0) */
942 if (IS_ERR(cs)) {
943 dev_err(&spi->dev, "No CS for SPI(%d)\n", spi_get_chipselect(spi, 0));
944 return -ENODEV;
945 }
946
947 if (!spi_get_ctldata(spi))
948 spi_set_ctldata(spi, cs);
949
950 pm_runtime_get_sync(&sdd->pdev->dev);
951
952 div = sdd->port_conf->clk_div;
953
954 /* Check if we can provide the requested rate */
955 if (!sdd->port_conf->clk_from_cmu) {
956 u32 psr, speed;
957
958 /* Max possible */
959 speed = clk_get_rate(sdd->src_clk) / div / (0 + 1);
960
961 if (spi->max_speed_hz > speed)
962 spi->max_speed_hz = speed;
963
964 psr = clk_get_rate(sdd->src_clk) / div / spi->max_speed_hz - 1;
965 psr &= S3C64XX_SPI_PSR_MASK;
966 if (psr == S3C64XX_SPI_PSR_MASK)
967 psr--;
968
969 speed = clk_get_rate(sdd->src_clk) / div / (psr + 1);
970 if (spi->max_speed_hz < speed) {
971 if (psr+1 < S3C64XX_SPI_PSR_MASK) {
972 psr++;
973 } else {
974 err = -EINVAL;
975 goto setup_exit;
976 }
977 }
978
979 speed = clk_get_rate(sdd->src_clk) / div / (psr + 1);
980 if (spi->max_speed_hz >= speed) {
981 spi->max_speed_hz = speed;
982 } else {
983 dev_err(&spi->dev, "Can't set %dHz transfer speed\n",
984 spi->max_speed_hz);
985 err = -EINVAL;
986 goto setup_exit;
987 }
988 }
989
990 pm_runtime_mark_last_busy(&sdd->pdev->dev);
991 pm_runtime_put_autosuspend(&sdd->pdev->dev);
992 s3c64xx_spi_set_cs(spi, false);
993
994 return 0;
995
996setup_exit:
997 pm_runtime_mark_last_busy(&sdd->pdev->dev);
998 pm_runtime_put_autosuspend(&sdd->pdev->dev);
999 /* setup() returns with device de-selected */
1000 s3c64xx_spi_set_cs(spi, false);
1001
1002 spi_set_ctldata(spi, NULL);
1003
1004 /* This was dynamically allocated on the DT path */
1005 if (spi->dev.of_node)
1006 kfree(cs);
1007
1008 return err;
1009}
1010
1011static void s3c64xx_spi_cleanup(struct spi_device *spi)
1012{
1013 struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi);
1014
1015 /* This was dynamically allocated on the DT path */
1016 if (spi->dev.of_node)
1017 kfree(cs);
1018
1019 spi_set_ctldata(spi, NULL);
1020}
1021
1022static irqreturn_t s3c64xx_spi_irq(int irq, void *data)
1023{
1024 struct s3c64xx_spi_driver_data *sdd = data;
1025 struct spi_controller *spi = sdd->host;
1026 unsigned int val, clr = 0;
1027
1028 val = readl(sdd->regs + S3C64XX_SPI_STATUS);
1029
1030 if (val & S3C64XX_SPI_ST_RX_OVERRUN_ERR) {
1031 clr = S3C64XX_SPI_PND_RX_OVERRUN_CLR;
1032 dev_err(&spi->dev, "RX overrun\n");
1033 }
1034 if (val & S3C64XX_SPI_ST_RX_UNDERRUN_ERR) {
1035 clr |= S3C64XX_SPI_PND_RX_UNDERRUN_CLR;
1036 dev_err(&spi->dev, "RX underrun\n");
1037 }
1038 if (val & S3C64XX_SPI_ST_TX_OVERRUN_ERR) {
1039 clr |= S3C64XX_SPI_PND_TX_OVERRUN_CLR;
1040 dev_err(&spi->dev, "TX overrun\n");
1041 }
1042 if (val & S3C64XX_SPI_ST_TX_UNDERRUN_ERR) {
1043 clr |= S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
1044 dev_err(&spi->dev, "TX underrun\n");
1045 }
1046
1047 if (val & S3C64XX_SPI_ST_RX_FIFORDY) {
1048 complete(&sdd->xfer_completion);
1049 /* No pending clear irq, turn-off INT_EN_RX_FIFO_RDY */
1050 val = readl(sdd->regs + S3C64XX_SPI_INT_EN);
1051 writel((val & ~S3C64XX_SPI_INT_RX_FIFORDY_EN),
1052 sdd->regs + S3C64XX_SPI_INT_EN);
1053 }
1054
1055 /* Clear the pending irq by setting and then clearing it */
1056 writel(clr, sdd->regs + S3C64XX_SPI_PENDING_CLR);
1057 writel(0, sdd->regs + S3C64XX_SPI_PENDING_CLR);
1058
1059 return IRQ_HANDLED;
1060}
1061
1062static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd)
1063{
1064 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
1065 void __iomem *regs = sdd->regs;
1066 unsigned int val;
1067
1068 sdd->cur_speed = 0;
1069
1070 if (sci->no_cs)
1071 writel(0, sdd->regs + S3C64XX_SPI_CS_REG);
1072 else if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
1073 writel(S3C64XX_SPI_CS_SIG_INACT, sdd->regs + S3C64XX_SPI_CS_REG);
1074
1075 /* Disable Interrupts - we use Polling if not DMA mode */
1076 writel(0, regs + S3C64XX_SPI_INT_EN);
1077
1078 if (!sdd->port_conf->clk_from_cmu)
1079 writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT,
1080 regs + S3C64XX_SPI_CLK_CFG);
1081 writel(0, regs + S3C64XX_SPI_MODE_CFG);
1082 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
1083
1084 /* Clear any irq pending bits, should set and clear the bits */
1085 val = S3C64XX_SPI_PND_RX_OVERRUN_CLR |
1086 S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
1087 S3C64XX_SPI_PND_TX_OVERRUN_CLR |
1088 S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
1089 writel(val, regs + S3C64XX_SPI_PENDING_CLR);
1090 writel(0, regs + S3C64XX_SPI_PENDING_CLR);
1091
1092 writel(0, regs + S3C64XX_SPI_SWAP_CFG);
1093
1094 val = readl(regs + S3C64XX_SPI_MODE_CFG);
1095 val &= ~S3C64XX_SPI_MODE_4BURST;
1096 val &= ~(S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
1097 val |= (S3C64XX_SPI_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
1098 writel(val, regs + S3C64XX_SPI_MODE_CFG);
1099
1100 s3c64xx_flush_fifo(sdd);
1101}
1102
1103#ifdef CONFIG_OF
1104static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev)
1105{
1106 struct s3c64xx_spi_info *sci;
1107 u32 temp;
1108
1109 sci = devm_kzalloc(dev, sizeof(*sci), GFP_KERNEL);
1110 if (!sci)
1111 return ERR_PTR(-ENOMEM);
1112
1113 if (of_property_read_u32(dev->of_node, "samsung,spi-src-clk", &temp)) {
1114 dev_warn(dev, "spi bus clock parent not specified, using clock at index 0 as parent\n");
1115 sci->src_clk_nr = 0;
1116 } else {
1117 sci->src_clk_nr = temp;
1118 }
1119
1120 if (of_property_read_u32(dev->of_node, "num-cs", &temp)) {
1121 dev_warn(dev, "number of chip select lines not specified, assuming 1 chip select line\n");
1122 sci->num_cs = 1;
1123 } else {
1124 sci->num_cs = temp;
1125 }
1126
1127 sci->no_cs = of_property_read_bool(dev->of_node, "no-cs-readback");
1128 sci->polling = !of_property_present(dev->of_node, "dmas");
1129
1130 return sci;
1131}
1132#else
1133static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev)
1134{
1135 return dev_get_platdata(dev);
1136}
1137#endif
1138
1139static inline const struct s3c64xx_spi_port_config *s3c64xx_spi_get_port_config(
1140 struct platform_device *pdev)
1141{
1142#ifdef CONFIG_OF
1143 if (pdev->dev.of_node)
1144 return of_device_get_match_data(&pdev->dev);
1145#endif
1146 return (const struct s3c64xx_spi_port_config *)platform_get_device_id(pdev)->driver_data;
1147}
1148
1149static int s3c64xx_spi_probe(struct platform_device *pdev)
1150{
1151 struct resource *mem_res;
1152 struct s3c64xx_spi_driver_data *sdd;
1153 struct s3c64xx_spi_info *sci = dev_get_platdata(&pdev->dev);
1154 struct spi_controller *host;
1155 int ret, irq;
1156 char clk_name[16];
1157
1158 if (!sci && pdev->dev.of_node) {
1159 sci = s3c64xx_spi_parse_dt(&pdev->dev);
1160 if (IS_ERR(sci))
1161 return PTR_ERR(sci);
1162 }
1163
1164 if (!sci)
1165 return dev_err_probe(&pdev->dev, -ENODEV,
1166 "Platform_data missing!\n");
1167
1168 irq = platform_get_irq(pdev, 0);
1169 if (irq < 0)
1170 return irq;
1171
1172 host = devm_spi_alloc_host(&pdev->dev, sizeof(*sdd));
1173 if (!host)
1174 return dev_err_probe(&pdev->dev, -ENOMEM,
1175 "Unable to allocate SPI Host\n");
1176
1177 platform_set_drvdata(pdev, host);
1178
1179 sdd = spi_controller_get_devdata(host);
1180 sdd->port_conf = s3c64xx_spi_get_port_config(pdev);
1181 sdd->host = host;
1182 sdd->cntrlr_info = sci;
1183 sdd->pdev = pdev;
1184 if (pdev->dev.of_node) {
1185 ret = of_alias_get_id(pdev->dev.of_node, "spi");
1186 if (ret < 0)
1187 return dev_err_probe(&pdev->dev, ret,
1188 "Failed to get alias id\n");
1189 sdd->port_id = ret;
1190 } else {
1191 sdd->port_id = pdev->id;
1192 }
1193
1194 sdd->cur_bpw = 8;
1195
1196 sdd->tx_dma.direction = DMA_MEM_TO_DEV;
1197 sdd->rx_dma.direction = DMA_DEV_TO_MEM;
1198
1199 host->dev.of_node = pdev->dev.of_node;
1200 host->bus_num = sdd->port_id;
1201 host->setup = s3c64xx_spi_setup;
1202 host->cleanup = s3c64xx_spi_cleanup;
1203 host->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer;
1204 host->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer;
1205 host->prepare_message = s3c64xx_spi_prepare_message;
1206 host->transfer_one = s3c64xx_spi_transfer_one;
1207 host->max_transfer_size = s3c64xx_spi_max_transfer_size;
1208 host->num_chipselect = sci->num_cs;
1209 host->use_gpio_descriptors = true;
1210 host->dma_alignment = 8;
1211 host->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) |
1212 SPI_BPW_MASK(8);
1213 /* the spi->mode bits understood by this driver: */
1214 host->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1215 if (sdd->port_conf->has_loopback)
1216 host->mode_bits |= SPI_LOOP;
1217 host->auto_runtime_pm = true;
1218 if (!is_polling(sdd))
1219 host->can_dma = s3c64xx_spi_can_dma;
1220
1221 sdd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem_res);
1222 if (IS_ERR(sdd->regs))
1223 return PTR_ERR(sdd->regs);
1224 sdd->sfr_start = mem_res->start;
1225
1226 if (sci->cfg_gpio && sci->cfg_gpio())
1227 return dev_err_probe(&pdev->dev, -EBUSY,
1228 "Unable to config gpio\n");
1229
1230 /* Setup clocks */
1231 sdd->clk = devm_clk_get_enabled(&pdev->dev, "spi");
1232 if (IS_ERR(sdd->clk))
1233 return dev_err_probe(&pdev->dev, PTR_ERR(sdd->clk),
1234 "Unable to acquire clock 'spi'\n");
1235
1236 sprintf(clk_name, "spi_busclk%d", sci->src_clk_nr);
1237 sdd->src_clk = devm_clk_get_enabled(&pdev->dev, clk_name);
1238 if (IS_ERR(sdd->src_clk))
1239 return dev_err_probe(&pdev->dev, PTR_ERR(sdd->src_clk),
1240 "Unable to acquire clock '%s'\n",
1241 clk_name);
1242
1243 if (sdd->port_conf->clk_ioclk) {
1244 sdd->ioclk = devm_clk_get_enabled(&pdev->dev, "spi_ioclk");
1245 if (IS_ERR(sdd->ioclk))
1246 return dev_err_probe(&pdev->dev, PTR_ERR(sdd->ioclk),
1247 "Unable to acquire 'ioclk'\n");
1248 }
1249
1250 pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
1251 pm_runtime_use_autosuspend(&pdev->dev);
1252 pm_runtime_set_active(&pdev->dev);
1253 pm_runtime_enable(&pdev->dev);
1254 pm_runtime_get_sync(&pdev->dev);
1255
1256 /* Setup Deufult Mode */
1257 s3c64xx_spi_hwinit(sdd);
1258
1259 spin_lock_init(&sdd->lock);
1260 init_completion(&sdd->xfer_completion);
1261
1262 ret = devm_request_irq(&pdev->dev, irq, s3c64xx_spi_irq, 0,
1263 "spi-s3c64xx", sdd);
1264 if (ret != 0) {
1265 dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n",
1266 irq, ret);
1267 goto err_pm_put;
1268 }
1269
1270 writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN |
1271 S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
1272 sdd->regs + S3C64XX_SPI_INT_EN);
1273
1274 ret = devm_spi_register_controller(&pdev->dev, host);
1275 if (ret != 0) {
1276 dev_err(&pdev->dev, "cannot register SPI host: %d\n", ret);
1277 goto err_pm_put;
1278 }
1279
1280 dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Targets attached\n",
1281 sdd->port_id, host->num_chipselect);
1282 dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tFIFO %dbytes\n",
1283 mem_res, (FIFO_LVL_MASK(sdd) >> 1) + 1);
1284
1285 pm_runtime_mark_last_busy(&pdev->dev);
1286 pm_runtime_put_autosuspend(&pdev->dev);
1287
1288 return 0;
1289
1290err_pm_put:
1291 pm_runtime_put_noidle(&pdev->dev);
1292 pm_runtime_disable(&pdev->dev);
1293 pm_runtime_set_suspended(&pdev->dev);
1294
1295 return ret;
1296}
1297
1298static void s3c64xx_spi_remove(struct platform_device *pdev)
1299{
1300 struct spi_controller *host = platform_get_drvdata(pdev);
1301 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
1302
1303 pm_runtime_get_sync(&pdev->dev);
1304
1305 writel(0, sdd->regs + S3C64XX_SPI_INT_EN);
1306
1307 if (!is_polling(sdd)) {
1308 dma_release_channel(sdd->rx_dma.ch);
1309 dma_release_channel(sdd->tx_dma.ch);
1310 }
1311
1312 pm_runtime_put_noidle(&pdev->dev);
1313 pm_runtime_disable(&pdev->dev);
1314 pm_runtime_set_suspended(&pdev->dev);
1315}
1316
1317#ifdef CONFIG_PM_SLEEP
1318static int s3c64xx_spi_suspend(struct device *dev)
1319{
1320 struct spi_controller *host = dev_get_drvdata(dev);
1321 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
1322
1323 int ret = spi_controller_suspend(host);
1324 if (ret)
1325 return ret;
1326
1327 ret = pm_runtime_force_suspend(dev);
1328 if (ret < 0)
1329 return ret;
1330
1331 sdd->cur_speed = 0; /* Output Clock is stopped */
1332
1333 return 0;
1334}
1335
1336static int s3c64xx_spi_resume(struct device *dev)
1337{
1338 struct spi_controller *host = dev_get_drvdata(dev);
1339 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
1340 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
1341 int ret;
1342
1343 if (sci->cfg_gpio)
1344 sci->cfg_gpio();
1345
1346 ret = pm_runtime_force_resume(dev);
1347 if (ret < 0)
1348 return ret;
1349
1350 return spi_controller_resume(host);
1351}
1352#endif /* CONFIG_PM_SLEEP */
1353
1354#ifdef CONFIG_PM
1355static int s3c64xx_spi_runtime_suspend(struct device *dev)
1356{
1357 struct spi_controller *host = dev_get_drvdata(dev);
1358 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
1359
1360 clk_disable_unprepare(sdd->clk);
1361 clk_disable_unprepare(sdd->src_clk);
1362 clk_disable_unprepare(sdd->ioclk);
1363
1364 return 0;
1365}
1366
1367static int s3c64xx_spi_runtime_resume(struct device *dev)
1368{
1369 struct spi_controller *host = dev_get_drvdata(dev);
1370 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
1371 int ret;
1372
1373 if (sdd->port_conf->clk_ioclk) {
1374 ret = clk_prepare_enable(sdd->ioclk);
1375 if (ret != 0)
1376 return ret;
1377 }
1378
1379 ret = clk_prepare_enable(sdd->src_clk);
1380 if (ret != 0)
1381 goto err_disable_ioclk;
1382
1383 ret = clk_prepare_enable(sdd->clk);
1384 if (ret != 0)
1385 goto err_disable_src_clk;
1386
1387 s3c64xx_spi_hwinit(sdd);
1388
1389 writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN |
1390 S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
1391 sdd->regs + S3C64XX_SPI_INT_EN);
1392
1393 return 0;
1394
1395err_disable_src_clk:
1396 clk_disable_unprepare(sdd->src_clk);
1397err_disable_ioclk:
1398 clk_disable_unprepare(sdd->ioclk);
1399
1400 return ret;
1401}
1402#endif /* CONFIG_PM */
1403
1404static const struct dev_pm_ops s3c64xx_spi_pm = {
1405 SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume)
1406 SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend,
1407 s3c64xx_spi_runtime_resume, NULL)
1408};
1409
1410static const struct s3c64xx_spi_port_config s3c2443_spi_port_config = {
1411 .fifo_lvl_mask = { 0x7f },
1412 .rx_lvl_offset = 13,
1413 .tx_st_done = 21,
1414 .clk_div = 2,
1415 .high_speed = true,
1416};
1417
1418static const struct s3c64xx_spi_port_config s3c6410_spi_port_config = {
1419 .fifo_lvl_mask = { 0x7f, 0x7F },
1420 .rx_lvl_offset = 13,
1421 .tx_st_done = 21,
1422 .clk_div = 2,
1423};
1424
1425static const struct s3c64xx_spi_port_config s5pv210_spi_port_config = {
1426 .fifo_lvl_mask = { 0x1ff, 0x7F },
1427 .rx_lvl_offset = 15,
1428 .tx_st_done = 25,
1429 .clk_div = 2,
1430 .high_speed = true,
1431};
1432
1433static const struct s3c64xx_spi_port_config exynos4_spi_port_config = {
1434 .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F },
1435 .rx_lvl_offset = 15,
1436 .tx_st_done = 25,
1437 .clk_div = 2,
1438 .high_speed = true,
1439 .clk_from_cmu = true,
1440 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1441};
1442
1443static const struct s3c64xx_spi_port_config exynos7_spi_port_config = {
1444 .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F, 0x7F, 0x7F, 0x1ff},
1445 .rx_lvl_offset = 15,
1446 .tx_st_done = 25,
1447 .clk_div = 2,
1448 .high_speed = true,
1449 .clk_from_cmu = true,
1450 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1451};
1452
1453static const struct s3c64xx_spi_port_config exynos5433_spi_port_config = {
1454 .fifo_lvl_mask = { 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff},
1455 .rx_lvl_offset = 15,
1456 .tx_st_done = 25,
1457 .clk_div = 2,
1458 .high_speed = true,
1459 .clk_from_cmu = true,
1460 .clk_ioclk = true,
1461 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1462};
1463
1464static const struct s3c64xx_spi_port_config exynosautov9_spi_port_config = {
1465 .fifo_lvl_mask = { 0x1ff, 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff, 0x7f,
1466 0x7f, 0x7f, 0x7f, 0x7f},
1467 .rx_lvl_offset = 15,
1468 .tx_st_done = 25,
1469 .clk_div = 4,
1470 .high_speed = true,
1471 .clk_from_cmu = true,
1472 .clk_ioclk = true,
1473 .has_loopback = true,
1474 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1475};
1476
1477static const struct s3c64xx_spi_port_config fsd_spi_port_config = {
1478 .fifo_lvl_mask = { 0x7f, 0x7f, 0x7f, 0x7f, 0x7f},
1479 .rx_lvl_offset = 15,
1480 .tx_st_done = 25,
1481 .clk_div = 2,
1482 .high_speed = true,
1483 .clk_from_cmu = true,
1484 .clk_ioclk = false,
1485 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1486};
1487
1488static const struct platform_device_id s3c64xx_spi_driver_ids[] = {
1489 {
1490 .name = "s3c2443-spi",
1491 .driver_data = (kernel_ulong_t)&s3c2443_spi_port_config,
1492 }, {
1493 .name = "s3c6410-spi",
1494 .driver_data = (kernel_ulong_t)&s3c6410_spi_port_config,
1495 },
1496 { },
1497};
1498
1499static const struct of_device_id s3c64xx_spi_dt_match[] = {
1500 { .compatible = "samsung,s3c2443-spi",
1501 .data = (void *)&s3c2443_spi_port_config,
1502 },
1503 { .compatible = "samsung,s3c6410-spi",
1504 .data = (void *)&s3c6410_spi_port_config,
1505 },
1506 { .compatible = "samsung,s5pv210-spi",
1507 .data = (void *)&s5pv210_spi_port_config,
1508 },
1509 { .compatible = "samsung,exynos4210-spi",
1510 .data = (void *)&exynos4_spi_port_config,
1511 },
1512 { .compatible = "samsung,exynos7-spi",
1513 .data = (void *)&exynos7_spi_port_config,
1514 },
1515 { .compatible = "samsung,exynos5433-spi",
1516 .data = (void *)&exynos5433_spi_port_config,
1517 },
1518 { .compatible = "samsung,exynosautov9-spi",
1519 .data = (void *)&exynosautov9_spi_port_config,
1520 },
1521 { .compatible = "tesla,fsd-spi",
1522 .data = (void *)&fsd_spi_port_config,
1523 },
1524 { },
1525};
1526MODULE_DEVICE_TABLE(of, s3c64xx_spi_dt_match);
1527
1528static struct platform_driver s3c64xx_spi_driver = {
1529 .driver = {
1530 .name = "s3c64xx-spi",
1531 .pm = &s3c64xx_spi_pm,
1532 .of_match_table = of_match_ptr(s3c64xx_spi_dt_match),
1533 },
1534 .probe = s3c64xx_spi_probe,
1535 .remove_new = s3c64xx_spi_remove,
1536 .id_table = s3c64xx_spi_driver_ids,
1537};
1538MODULE_ALIAS("platform:s3c64xx-spi");
1539
1540module_platform_driver(s3c64xx_spi_driver);
1541
1542MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
1543MODULE_DESCRIPTION("S3C64XX SPI Controller Driver");
1544MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0+
2//
3// Copyright (c) 2009 Samsung Electronics Co., Ltd.
4// Jaswinder Singh <jassi.brar@samsung.com>
5
6#include <linux/bitops.h>
7#include <linux/bits.h>
8#include <linux/clk.h>
9#include <linux/delay.h>
10#include <linux/dma-mapping.h>
11#include <linux/dmaengine.h>
12#include <linux/init.h>
13#include <linux/interrupt.h>
14#include <linux/io.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/platform_data/spi-s3c64xx.h>
18#include <linux/platform_device.h>
19#include <linux/pm_runtime.h>
20#include <linux/spi/spi.h>
21#include <linux/types.h>
22
23#define MAX_SPI_PORTS 12
24#define S3C64XX_SPI_QUIRK_CS_AUTO (1 << 1)
25#define AUTOSUSPEND_TIMEOUT 2000
26
27/* Registers and bit-fields */
28
29#define S3C64XX_SPI_CH_CFG 0x00
30#define S3C64XX_SPI_CLK_CFG 0x04
31#define S3C64XX_SPI_MODE_CFG 0x08
32#define S3C64XX_SPI_CS_REG 0x0C
33#define S3C64XX_SPI_INT_EN 0x10
34#define S3C64XX_SPI_STATUS 0x14
35#define S3C64XX_SPI_TX_DATA 0x18
36#define S3C64XX_SPI_RX_DATA 0x1C
37#define S3C64XX_SPI_PACKET_CNT 0x20
38#define S3C64XX_SPI_PENDING_CLR 0x24
39#define S3C64XX_SPI_SWAP_CFG 0x28
40#define S3C64XX_SPI_FB_CLK 0x2C
41
42#define S3C64XX_SPI_CH_HS_EN (1<<6) /* High Speed Enable */
43#define S3C64XX_SPI_CH_SW_RST (1<<5)
44#define S3C64XX_SPI_CH_SLAVE (1<<4)
45#define S3C64XX_SPI_CPOL_L (1<<3)
46#define S3C64XX_SPI_CPHA_B (1<<2)
47#define S3C64XX_SPI_CH_RXCH_ON (1<<1)
48#define S3C64XX_SPI_CH_TXCH_ON (1<<0)
49
50#define S3C64XX_SPI_CLKSEL_SRCMSK (3<<9)
51#define S3C64XX_SPI_CLKSEL_SRCSHFT 9
52#define S3C64XX_SPI_ENCLK_ENABLE (1<<8)
53#define S3C64XX_SPI_PSR_MASK 0xff
54
55#define S3C64XX_SPI_MODE_CH_TSZ_BYTE (0<<29)
56#define S3C64XX_SPI_MODE_CH_TSZ_HALFWORD (1<<29)
57#define S3C64XX_SPI_MODE_CH_TSZ_WORD (2<<29)
58#define S3C64XX_SPI_MODE_CH_TSZ_MASK (3<<29)
59#define S3C64XX_SPI_MODE_BUS_TSZ_BYTE (0<<17)
60#define S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD (1<<17)
61#define S3C64XX_SPI_MODE_BUS_TSZ_WORD (2<<17)
62#define S3C64XX_SPI_MODE_BUS_TSZ_MASK (3<<17)
63#define S3C64XX_SPI_MODE_RX_RDY_LVL GENMASK(16, 11)
64#define S3C64XX_SPI_MODE_RX_RDY_LVL_SHIFT 11
65#define S3C64XX_SPI_MODE_SELF_LOOPBACK (1<<3)
66#define S3C64XX_SPI_MODE_RXDMA_ON (1<<2)
67#define S3C64XX_SPI_MODE_TXDMA_ON (1<<1)
68#define S3C64XX_SPI_MODE_4BURST (1<<0)
69
70#define S3C64XX_SPI_CS_NSC_CNT_2 (2<<4)
71#define S3C64XX_SPI_CS_AUTO (1<<1)
72#define S3C64XX_SPI_CS_SIG_INACT (1<<0)
73
74#define S3C64XX_SPI_INT_TRAILING_EN (1<<6)
75#define S3C64XX_SPI_INT_RX_OVERRUN_EN (1<<5)
76#define S3C64XX_SPI_INT_RX_UNDERRUN_EN (1<<4)
77#define S3C64XX_SPI_INT_TX_OVERRUN_EN (1<<3)
78#define S3C64XX_SPI_INT_TX_UNDERRUN_EN (1<<2)
79#define S3C64XX_SPI_INT_RX_FIFORDY_EN (1<<1)
80#define S3C64XX_SPI_INT_TX_FIFORDY_EN (1<<0)
81
82#define S3C64XX_SPI_ST_RX_FIFO_RDY_V2 GENMASK(23, 15)
83#define S3C64XX_SPI_ST_TX_FIFO_RDY_V2 GENMASK(14, 6)
84#define S3C64XX_SPI_ST_TX_FIFO_LVL_SHIFT 6
85#define S3C64XX_SPI_ST_RX_OVERRUN_ERR (1<<5)
86#define S3C64XX_SPI_ST_RX_UNDERRUN_ERR (1<<4)
87#define S3C64XX_SPI_ST_TX_OVERRUN_ERR (1<<3)
88#define S3C64XX_SPI_ST_TX_UNDERRUN_ERR (1<<2)
89#define S3C64XX_SPI_ST_RX_FIFORDY (1<<1)
90#define S3C64XX_SPI_ST_TX_FIFORDY (1<<0)
91
92#define S3C64XX_SPI_PACKET_CNT_EN (1<<16)
93#define S3C64XX_SPI_PACKET_CNT_MASK GENMASK(15, 0)
94
95#define S3C64XX_SPI_PND_TX_UNDERRUN_CLR (1<<4)
96#define S3C64XX_SPI_PND_TX_OVERRUN_CLR (1<<3)
97#define S3C64XX_SPI_PND_RX_UNDERRUN_CLR (1<<2)
98#define S3C64XX_SPI_PND_RX_OVERRUN_CLR (1<<1)
99#define S3C64XX_SPI_PND_TRAILING_CLR (1<<0)
100
101#define S3C64XX_SPI_SWAP_RX_HALF_WORD (1<<7)
102#define S3C64XX_SPI_SWAP_RX_BYTE (1<<6)
103#define S3C64XX_SPI_SWAP_RX_BIT (1<<5)
104#define S3C64XX_SPI_SWAP_RX_EN (1<<4)
105#define S3C64XX_SPI_SWAP_TX_HALF_WORD (1<<3)
106#define S3C64XX_SPI_SWAP_TX_BYTE (1<<2)
107#define S3C64XX_SPI_SWAP_TX_BIT (1<<1)
108#define S3C64XX_SPI_SWAP_TX_EN (1<<0)
109
110#define S3C64XX_SPI_FBCLK_MSK (3<<0)
111
112#define FIFO_LVL_MASK(i) ((i)->port_conf->fifo_lvl_mask[i->port_id])
113#define S3C64XX_SPI_ST_TX_DONE(v, i) (((v) & \
114 (1 << (i)->port_conf->tx_st_done)) ? 1 : 0)
115#define TX_FIFO_LVL(v, sdd) (((v) & (sdd)->tx_fifomask) >> \
116 __ffs((sdd)->tx_fifomask))
117#define RX_FIFO_LVL(v, sdd) (((v) & (sdd)->rx_fifomask) >> \
118 __ffs((sdd)->rx_fifomask))
119#define FIFO_DEPTH(i) ((FIFO_LVL_MASK(i) >> 1) + 1)
120
121#define S3C64XX_SPI_MAX_TRAILCNT 0x3ff
122#define S3C64XX_SPI_TRAILCNT_OFF 19
123
124#define S3C64XX_SPI_POLLING_SIZE 32
125
126#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
127#define is_polling(x) (x->cntrlr_info->polling)
128
129#define RXBUSY (1<<2)
130#define TXBUSY (1<<3)
131
132struct s3c64xx_spi_dma_data {
133 struct dma_chan *ch;
134 dma_cookie_t cookie;
135 enum dma_transfer_direction direction;
136};
137
138/**
139 * struct s3c64xx_spi_port_config - SPI Controller hardware info
140 * @fifo_lvl_mask: [DEPRECATED] use @{rx, tx}_fifomask instead.
141 * @rx_lvl_offset: [DEPRECATED] use @{rx,tx}_fifomask instead.
142 * @fifo_depth: depth of the FIFO.
143 * @rx_fifomask: SPI_STATUS.RX_FIFO_LVL mask. Shifted mask defining the field's
144 * length and position.
145 * @tx_fifomask: SPI_STATUS.TX_FIFO_LVL mask. Shifted mask defining the field's
146 * length and position.
147 * @tx_st_done: Bit offset of TX_DONE bit in SPI_STATUS regiter.
148 * @clk_div: Internal clock divider
149 * @quirks: Bitmask of known quirks
150 * @high_speed: True, if the controller supports HIGH_SPEED_EN bit.
151 * @clk_from_cmu: True, if the controller does not include a clock mux and
152 * prescaler unit.
153 * @clk_ioclk: True if clock is present on this device
154 * @has_loopback: True if loopback mode can be supported
155 * @use_32bit_io: True if the SoC allows only 32-bit register accesses.
156 *
157 * The Samsung s3c64xx SPI controller are used on various Samsung SoC's but
158 * differ in some aspects such as the size of the fifo and spi bus clock
159 * setup. Such differences are specified to the driver using this structure
160 * which is provided as driver data to the driver.
161 */
162struct s3c64xx_spi_port_config {
163 int fifo_lvl_mask[MAX_SPI_PORTS];
164 int rx_lvl_offset;
165 unsigned int fifo_depth;
166 u32 rx_fifomask;
167 u32 tx_fifomask;
168 int tx_st_done;
169 int quirks;
170 int clk_div;
171 bool high_speed;
172 bool clk_from_cmu;
173 bool clk_ioclk;
174 bool has_loopback;
175 bool use_32bit_io;
176};
177
178/**
179 * struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver.
180 * @clk: Pointer to the spi clock.
181 * @src_clk: Pointer to the clock used to generate SPI signals.
182 * @ioclk: Pointer to the i/o clock between host and target
183 * @pdev: Pointer to device's platform device data
184 * @host: Pointer to the SPI Protocol host.
185 * @cntrlr_info: Platform specific data for the controller this driver manages.
186 * @lock: Controller specific lock.
187 * @state: Set of FLAGS to indicate status.
188 * @sfr_start: BUS address of SPI controller regs.
189 * @regs: Pointer to ioremap'ed controller registers.
190 * @xfer_completion: To indicate completion of xfer task.
191 * @cur_mode: Stores the active configuration of the controller.
192 * @cur_bpw: Stores the active bits per word settings.
193 * @cur_speed: Current clock speed
194 * @rx_dma: Local receive DMA data (e.g. chan and direction)
195 * @tx_dma: Local transmit DMA data (e.g. chan and direction)
196 * @port_conf: Local SPI port configuration data
197 * @port_id: [DEPRECATED] use @{rx,tx}_fifomask instead.
198 * @fifo_depth: depth of the FIFO.
199 * @rx_fifomask: SPI_STATUS.RX_FIFO_LVL mask. Shifted mask defining the field's
200 * length and position.
201 * @tx_fifomask: SPI_STATUS.TX_FIFO_LVL mask. Shifted mask defining the field's
202 * length and position.
203 */
204struct s3c64xx_spi_driver_data {
205 void __iomem *regs;
206 struct clk *clk;
207 struct clk *src_clk;
208 struct clk *ioclk;
209 struct platform_device *pdev;
210 struct spi_controller *host;
211 struct s3c64xx_spi_info *cntrlr_info;
212 spinlock_t lock;
213 unsigned long sfr_start;
214 struct completion xfer_completion;
215 unsigned state;
216 unsigned cur_mode, cur_bpw;
217 unsigned cur_speed;
218 struct s3c64xx_spi_dma_data rx_dma;
219 struct s3c64xx_spi_dma_data tx_dma;
220 const struct s3c64xx_spi_port_config *port_conf;
221 unsigned int port_id;
222 unsigned int fifo_depth;
223 u32 rx_fifomask;
224 u32 tx_fifomask;
225};
226
227static void s3c64xx_flush_fifo(struct s3c64xx_spi_driver_data *sdd)
228{
229 void __iomem *regs = sdd->regs;
230 unsigned long loops;
231 u32 val;
232
233 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
234
235 val = readl(regs + S3C64XX_SPI_CH_CFG);
236 val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON);
237 writel(val, regs + S3C64XX_SPI_CH_CFG);
238
239 val = readl(regs + S3C64XX_SPI_CH_CFG);
240 val |= S3C64XX_SPI_CH_SW_RST;
241 val &= ~S3C64XX_SPI_CH_HS_EN;
242 writel(val, regs + S3C64XX_SPI_CH_CFG);
243
244 /* Flush TxFIFO*/
245 loops = msecs_to_loops(1);
246 do {
247 val = readl(regs + S3C64XX_SPI_STATUS);
248 } while (TX_FIFO_LVL(val, sdd) && --loops);
249
250 if (loops == 0)
251 dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n");
252
253 /* Flush RxFIFO*/
254 loops = msecs_to_loops(1);
255 do {
256 val = readl(regs + S3C64XX_SPI_STATUS);
257 if (RX_FIFO_LVL(val, sdd))
258 readl(regs + S3C64XX_SPI_RX_DATA);
259 else
260 break;
261 } while (--loops);
262
263 if (loops == 0)
264 dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n");
265
266 val = readl(regs + S3C64XX_SPI_CH_CFG);
267 val &= ~S3C64XX_SPI_CH_SW_RST;
268 writel(val, regs + S3C64XX_SPI_CH_CFG);
269
270 val = readl(regs + S3C64XX_SPI_MODE_CFG);
271 val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
272 writel(val, regs + S3C64XX_SPI_MODE_CFG);
273}
274
275static void s3c64xx_spi_dmacb(void *data)
276{
277 struct s3c64xx_spi_driver_data *sdd;
278 struct s3c64xx_spi_dma_data *dma = data;
279 unsigned long flags;
280
281 if (dma->direction == DMA_DEV_TO_MEM)
282 sdd = container_of(data,
283 struct s3c64xx_spi_driver_data, rx_dma);
284 else
285 sdd = container_of(data,
286 struct s3c64xx_spi_driver_data, tx_dma);
287
288 spin_lock_irqsave(&sdd->lock, flags);
289
290 if (dma->direction == DMA_DEV_TO_MEM) {
291 sdd->state &= ~RXBUSY;
292 if (!(sdd->state & TXBUSY))
293 complete(&sdd->xfer_completion);
294 } else {
295 sdd->state &= ~TXBUSY;
296 if (!(sdd->state & RXBUSY))
297 complete(&sdd->xfer_completion);
298 }
299
300 spin_unlock_irqrestore(&sdd->lock, flags);
301}
302
303static int s3c64xx_prepare_dma(struct s3c64xx_spi_dma_data *dma,
304 struct sg_table *sgt)
305{
306 struct s3c64xx_spi_driver_data *sdd;
307 struct dma_slave_config config;
308 struct dma_async_tx_descriptor *desc;
309 int ret;
310
311 memset(&config, 0, sizeof(config));
312
313 if (dma->direction == DMA_DEV_TO_MEM) {
314 sdd = container_of((void *)dma,
315 struct s3c64xx_spi_driver_data, rx_dma);
316 config.src_addr = sdd->sfr_start + S3C64XX_SPI_RX_DATA;
317 config.src_addr_width = sdd->cur_bpw / 8;
318 config.src_maxburst = 1;
319 } else {
320 sdd = container_of((void *)dma,
321 struct s3c64xx_spi_driver_data, tx_dma);
322 config.dst_addr = sdd->sfr_start + S3C64XX_SPI_TX_DATA;
323 config.dst_addr_width = sdd->cur_bpw / 8;
324 config.dst_maxburst = 1;
325 }
326 config.direction = dma->direction;
327 ret = dmaengine_slave_config(dma->ch, &config);
328 if (ret)
329 return ret;
330
331 desc = dmaengine_prep_slave_sg(dma->ch, sgt->sgl, sgt->nents,
332 dma->direction, DMA_PREP_INTERRUPT);
333 if (!desc) {
334 dev_err(&sdd->pdev->dev, "unable to prepare %s scatterlist",
335 dma->direction == DMA_DEV_TO_MEM ? "rx" : "tx");
336 return -ENOMEM;
337 }
338
339 desc->callback = s3c64xx_spi_dmacb;
340 desc->callback_param = dma;
341
342 dma->cookie = dmaengine_submit(desc);
343 ret = dma_submit_error(dma->cookie);
344 if (ret) {
345 dev_err(&sdd->pdev->dev, "DMA submission failed");
346 return ret;
347 }
348
349 dma_async_issue_pending(dma->ch);
350 return 0;
351}
352
353static void s3c64xx_spi_set_cs(struct spi_device *spi, bool enable)
354{
355 struct s3c64xx_spi_driver_data *sdd =
356 spi_controller_get_devdata(spi->controller);
357
358 if (sdd->cntrlr_info->no_cs)
359 return;
360
361 if (enable) {
362 if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO)) {
363 writel(0, sdd->regs + S3C64XX_SPI_CS_REG);
364 } else {
365 u32 ssel = readl(sdd->regs + S3C64XX_SPI_CS_REG);
366
367 ssel |= (S3C64XX_SPI_CS_AUTO |
368 S3C64XX_SPI_CS_NSC_CNT_2);
369 writel(ssel, sdd->regs + S3C64XX_SPI_CS_REG);
370 }
371 } else {
372 if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
373 writel(S3C64XX_SPI_CS_SIG_INACT,
374 sdd->regs + S3C64XX_SPI_CS_REG);
375 }
376}
377
378static int s3c64xx_spi_prepare_transfer(struct spi_controller *spi)
379{
380 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(spi);
381
382 if (is_polling(sdd))
383 return 0;
384
385 /* Requests DMA channels */
386 sdd->rx_dma.ch = dma_request_chan(&sdd->pdev->dev, "rx");
387 if (IS_ERR(sdd->rx_dma.ch)) {
388 dev_err(&sdd->pdev->dev, "Failed to get RX DMA channel\n");
389 sdd->rx_dma.ch = NULL;
390 return 0;
391 }
392
393 sdd->tx_dma.ch = dma_request_chan(&sdd->pdev->dev, "tx");
394 if (IS_ERR(sdd->tx_dma.ch)) {
395 dev_err(&sdd->pdev->dev, "Failed to get TX DMA channel\n");
396 dma_release_channel(sdd->rx_dma.ch);
397 sdd->tx_dma.ch = NULL;
398 sdd->rx_dma.ch = NULL;
399 return 0;
400 }
401
402 spi->dma_rx = sdd->rx_dma.ch;
403 spi->dma_tx = sdd->tx_dma.ch;
404
405 return 0;
406}
407
408static int s3c64xx_spi_unprepare_transfer(struct spi_controller *spi)
409{
410 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(spi);
411
412 if (is_polling(sdd))
413 return 0;
414
415 /* Releases DMA channels if they are allocated */
416 if (sdd->rx_dma.ch && sdd->tx_dma.ch) {
417 dma_release_channel(sdd->rx_dma.ch);
418 dma_release_channel(sdd->tx_dma.ch);
419 sdd->rx_dma.ch = NULL;
420 sdd->tx_dma.ch = NULL;
421 }
422
423 return 0;
424}
425
426static bool s3c64xx_spi_can_dma(struct spi_controller *host,
427 struct spi_device *spi,
428 struct spi_transfer *xfer)
429{
430 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
431
432 if (sdd->rx_dma.ch && sdd->tx_dma.ch)
433 return xfer->len >= sdd->fifo_depth;
434
435 return false;
436}
437
438static void s3c64xx_iowrite8_32_rep(volatile void __iomem *addr,
439 const void *buffer, unsigned int count)
440{
441 if (count) {
442 const u8 *buf = buffer;
443
444 do {
445 __raw_writel(*buf++, addr);
446 } while (--count);
447 }
448}
449
450static void s3c64xx_iowrite16_32_rep(volatile void __iomem *addr,
451 const void *buffer, unsigned int count)
452{
453 if (count) {
454 const u16 *buf = buffer;
455
456 do {
457 __raw_writel(*buf++, addr);
458 } while (--count);
459 }
460}
461
462static void s3c64xx_iowrite_rep(const struct s3c64xx_spi_driver_data *sdd,
463 struct spi_transfer *xfer)
464{
465 void __iomem *addr = sdd->regs + S3C64XX_SPI_TX_DATA;
466 const void *buf = xfer->tx_buf;
467 unsigned int len = xfer->len;
468
469 switch (sdd->cur_bpw) {
470 case 32:
471 iowrite32_rep(addr, buf, len / 4);
472 break;
473 case 16:
474 if (sdd->port_conf->use_32bit_io)
475 s3c64xx_iowrite16_32_rep(addr, buf, len / 2);
476 else
477 iowrite16_rep(addr, buf, len / 2);
478 break;
479 default:
480 if (sdd->port_conf->use_32bit_io)
481 s3c64xx_iowrite8_32_rep(addr, buf, len);
482 else
483 iowrite8_rep(addr, buf, len);
484 break;
485 }
486}
487
488static int s3c64xx_enable_datapath(struct s3c64xx_spi_driver_data *sdd,
489 struct spi_transfer *xfer, int dma_mode)
490{
491 void __iomem *regs = sdd->regs;
492 u32 modecfg, chcfg;
493 int ret = 0;
494
495 modecfg = readl(regs + S3C64XX_SPI_MODE_CFG);
496 modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
497
498 chcfg = readl(regs + S3C64XX_SPI_CH_CFG);
499 chcfg &= ~S3C64XX_SPI_CH_TXCH_ON;
500
501 if (dma_mode) {
502 chcfg &= ~S3C64XX_SPI_CH_RXCH_ON;
503 } else {
504 /* Always shift in data in FIFO, even if xfer is Tx only,
505 * this helps setting PCKT_CNT value for generating clocks
506 * as exactly needed.
507 */
508 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
509 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
510 | S3C64XX_SPI_PACKET_CNT_EN,
511 regs + S3C64XX_SPI_PACKET_CNT);
512 }
513
514 if (xfer->tx_buf != NULL) {
515 sdd->state |= TXBUSY;
516 chcfg |= S3C64XX_SPI_CH_TXCH_ON;
517 if (dma_mode) {
518 modecfg |= S3C64XX_SPI_MODE_TXDMA_ON;
519 ret = s3c64xx_prepare_dma(&sdd->tx_dma, &xfer->tx_sg);
520 } else {
521 s3c64xx_iowrite_rep(sdd, xfer);
522 }
523 }
524
525 if (xfer->rx_buf != NULL) {
526 sdd->state |= RXBUSY;
527
528 if (sdd->port_conf->high_speed && sdd->cur_speed >= 30000000UL
529 && !(sdd->cur_mode & SPI_CPHA))
530 chcfg |= S3C64XX_SPI_CH_HS_EN;
531
532 if (dma_mode) {
533 modecfg |= S3C64XX_SPI_MODE_RXDMA_ON;
534 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
535 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
536 | S3C64XX_SPI_PACKET_CNT_EN,
537 regs + S3C64XX_SPI_PACKET_CNT);
538 ret = s3c64xx_prepare_dma(&sdd->rx_dma, &xfer->rx_sg);
539 }
540 }
541
542 if (ret)
543 return ret;
544
545 writel(modecfg, regs + S3C64XX_SPI_MODE_CFG);
546 writel(chcfg, regs + S3C64XX_SPI_CH_CFG);
547
548 return 0;
549}
550
551static u32 s3c64xx_spi_wait_for_timeout(struct s3c64xx_spi_driver_data *sdd,
552 int timeout_ms)
553{
554 void __iomem *regs = sdd->regs;
555 unsigned long val = 1;
556 u32 status;
557 u32 max_fifo = sdd->fifo_depth;
558
559 if (timeout_ms)
560 val = msecs_to_loops(timeout_ms);
561
562 do {
563 status = readl(regs + S3C64XX_SPI_STATUS);
564 } while (RX_FIFO_LVL(status, sdd) < max_fifo && --val);
565
566 /* return the actual received data length */
567 return RX_FIFO_LVL(status, sdd);
568}
569
570static int s3c64xx_wait_for_dma(struct s3c64xx_spi_driver_data *sdd,
571 struct spi_transfer *xfer)
572{
573 void __iomem *regs = sdd->regs;
574 unsigned long val;
575 u32 status;
576 int ms;
577
578 /* millisecs to xfer 'len' bytes @ 'cur_speed' */
579 ms = xfer->len * 8 * 1000 / sdd->cur_speed;
580 ms += 30; /* some tolerance */
581 ms = max(ms, 100); /* minimum timeout */
582
583 val = msecs_to_jiffies(ms) + 10;
584 val = wait_for_completion_timeout(&sdd->xfer_completion, val);
585
586 /*
587 * If the previous xfer was completed within timeout, then
588 * proceed further else return -ETIMEDOUT.
589 * DmaTx returns after simply writing data in the FIFO,
590 * w/o waiting for real transmission on the bus to finish.
591 * DmaRx returns only after Dma read data from FIFO which
592 * needs bus transmission to finish, so we don't worry if
593 * Xfer involved Rx(with or without Tx).
594 */
595 if (val && !xfer->rx_buf) {
596 val = msecs_to_loops(10);
597 status = readl(regs + S3C64XX_SPI_STATUS);
598 while ((TX_FIFO_LVL(status, sdd)
599 || !S3C64XX_SPI_ST_TX_DONE(status, sdd))
600 && --val) {
601 cpu_relax();
602 status = readl(regs + S3C64XX_SPI_STATUS);
603 }
604
605 }
606
607 /* If timed out while checking rx/tx status return error */
608 if (!val)
609 return -ETIMEDOUT;
610
611 return 0;
612}
613
614static int s3c64xx_wait_for_pio(struct s3c64xx_spi_driver_data *sdd,
615 struct spi_transfer *xfer, bool use_irq)
616{
617 void __iomem *regs = sdd->regs;
618 unsigned long val;
619 u32 status;
620 int loops;
621 u32 cpy_len;
622 u8 *buf;
623 int ms;
624 unsigned long time_us;
625
626 /* microsecs to xfer 'len' bytes @ 'cur_speed' */
627 time_us = (xfer->len * 8 * 1000 * 1000) / sdd->cur_speed;
628 ms = (time_us / 1000);
629 ms += 10; /* some tolerance */
630
631 /* sleep during signal transfer time */
632 status = readl(regs + S3C64XX_SPI_STATUS);
633 if (RX_FIFO_LVL(status, sdd) < xfer->len)
634 usleep_range(time_us / 2, time_us);
635
636 if (use_irq) {
637 val = msecs_to_jiffies(ms);
638 if (!wait_for_completion_timeout(&sdd->xfer_completion, val))
639 return -ETIMEDOUT;
640 }
641
642 val = msecs_to_loops(ms);
643 do {
644 status = readl(regs + S3C64XX_SPI_STATUS);
645 } while (RX_FIFO_LVL(status, sdd) < xfer->len && --val);
646
647 if (!val)
648 return -EIO;
649
650 /* If it was only Tx */
651 if (!xfer->rx_buf) {
652 sdd->state &= ~TXBUSY;
653 return 0;
654 }
655
656 /*
657 * If the receive length is bigger than the controller fifo
658 * size, calculate the loops and read the fifo as many times.
659 * loops = length / max fifo size (calculated by using the
660 * fifo mask).
661 * For any size less than the fifo size the below code is
662 * executed atleast once.
663 */
664 loops = xfer->len / sdd->fifo_depth;
665 buf = xfer->rx_buf;
666 do {
667 /* wait for data to be received in the fifo */
668 cpy_len = s3c64xx_spi_wait_for_timeout(sdd,
669 (loops ? ms : 0));
670
671 switch (sdd->cur_bpw) {
672 case 32:
673 ioread32_rep(regs + S3C64XX_SPI_RX_DATA,
674 buf, cpy_len / 4);
675 break;
676 case 16:
677 ioread16_rep(regs + S3C64XX_SPI_RX_DATA,
678 buf, cpy_len / 2);
679 break;
680 default:
681 ioread8_rep(regs + S3C64XX_SPI_RX_DATA,
682 buf, cpy_len);
683 break;
684 }
685
686 buf = buf + cpy_len;
687 } while (loops--);
688 sdd->state &= ~RXBUSY;
689
690 return 0;
691}
692
693static int s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
694{
695 void __iomem *regs = sdd->regs;
696 int ret;
697 u32 val;
698 int div = sdd->port_conf->clk_div;
699
700 /* Disable Clock */
701 if (!sdd->port_conf->clk_from_cmu) {
702 val = readl(regs + S3C64XX_SPI_CLK_CFG);
703 val &= ~S3C64XX_SPI_ENCLK_ENABLE;
704 writel(val, regs + S3C64XX_SPI_CLK_CFG);
705 }
706
707 /* Set Polarity and Phase */
708 val = readl(regs + S3C64XX_SPI_CH_CFG);
709 val &= ~(S3C64XX_SPI_CH_SLAVE |
710 S3C64XX_SPI_CPOL_L |
711 S3C64XX_SPI_CPHA_B);
712
713 if (sdd->cur_mode & SPI_CPOL)
714 val |= S3C64XX_SPI_CPOL_L;
715
716 if (sdd->cur_mode & SPI_CPHA)
717 val |= S3C64XX_SPI_CPHA_B;
718
719 writel(val, regs + S3C64XX_SPI_CH_CFG);
720
721 /* Set Channel & DMA Mode */
722 val = readl(regs + S3C64XX_SPI_MODE_CFG);
723 val &= ~(S3C64XX_SPI_MODE_BUS_TSZ_MASK
724 | S3C64XX_SPI_MODE_CH_TSZ_MASK);
725
726 switch (sdd->cur_bpw) {
727 case 32:
728 val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD;
729 val |= S3C64XX_SPI_MODE_CH_TSZ_WORD;
730 break;
731 case 16:
732 val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD;
733 val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD;
734 break;
735 default:
736 val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE;
737 val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE;
738 break;
739 }
740
741 if ((sdd->cur_mode & SPI_LOOP) && sdd->port_conf->has_loopback)
742 val |= S3C64XX_SPI_MODE_SELF_LOOPBACK;
743 else
744 val &= ~S3C64XX_SPI_MODE_SELF_LOOPBACK;
745
746 writel(val, regs + S3C64XX_SPI_MODE_CFG);
747
748 if (sdd->port_conf->clk_from_cmu) {
749 ret = clk_set_rate(sdd->src_clk, sdd->cur_speed * div);
750 if (ret)
751 return ret;
752 sdd->cur_speed = clk_get_rate(sdd->src_clk) / div;
753 } else {
754 /* Configure Clock */
755 val = readl(regs + S3C64XX_SPI_CLK_CFG);
756 val &= ~S3C64XX_SPI_PSR_MASK;
757 val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / div - 1)
758 & S3C64XX_SPI_PSR_MASK);
759 writel(val, regs + S3C64XX_SPI_CLK_CFG);
760
761 /* Enable Clock */
762 val = readl(regs + S3C64XX_SPI_CLK_CFG);
763 val |= S3C64XX_SPI_ENCLK_ENABLE;
764 writel(val, regs + S3C64XX_SPI_CLK_CFG);
765 }
766
767 return 0;
768}
769
770#define XFER_DMAADDR_INVALID DMA_BIT_MASK(32)
771
772static int s3c64xx_spi_prepare_message(struct spi_controller *host,
773 struct spi_message *msg)
774{
775 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
776 struct spi_device *spi = msg->spi;
777 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
778
779 /* Configure feedback delay */
780 if (!cs)
781 /* No delay if not defined */
782 writel(0, sdd->regs + S3C64XX_SPI_FB_CLK);
783 else
784 writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK);
785
786 return 0;
787}
788
789static size_t s3c64xx_spi_max_transfer_size(struct spi_device *spi)
790{
791 struct spi_controller *ctlr = spi->controller;
792
793 return ctlr->can_dma ? S3C64XX_SPI_PACKET_CNT_MASK : SIZE_MAX;
794}
795
796static int s3c64xx_spi_transfer_one(struct spi_controller *host,
797 struct spi_device *spi,
798 struct spi_transfer *xfer)
799{
800 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
801 const unsigned int fifo_len = sdd->fifo_depth;
802 const void *tx_buf = NULL;
803 void *rx_buf = NULL;
804 int target_len = 0, origin_len = 0;
805 int use_dma = 0;
806 bool use_irq = false;
807 int status;
808 u32 speed;
809 u8 bpw;
810 unsigned long flags;
811 u32 rdy_lv;
812 u32 val;
813
814 reinit_completion(&sdd->xfer_completion);
815
816 /* Only BPW and Speed may change across transfers */
817 bpw = xfer->bits_per_word;
818 speed = xfer->speed_hz;
819
820 if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) {
821 sdd->cur_bpw = bpw;
822 sdd->cur_speed = speed;
823 sdd->cur_mode = spi->mode;
824 status = s3c64xx_spi_config(sdd);
825 if (status)
826 return status;
827 }
828
829 if (!is_polling(sdd) && xfer->len >= fifo_len &&
830 sdd->rx_dma.ch && sdd->tx_dma.ch) {
831 use_dma = 1;
832 } else if (xfer->len >= fifo_len) {
833 tx_buf = xfer->tx_buf;
834 rx_buf = xfer->rx_buf;
835 origin_len = xfer->len;
836 target_len = xfer->len;
837 xfer->len = fifo_len - 1;
838 }
839
840 do {
841 /* transfer size is greater than 32, change to IRQ mode */
842 if (!use_dma && xfer->len > S3C64XX_SPI_POLLING_SIZE)
843 use_irq = true;
844
845 if (use_irq) {
846 reinit_completion(&sdd->xfer_completion);
847
848 rdy_lv = xfer->len;
849 /* Setup RDY_FIFO trigger Level
850 * RDY_LVL =
851 * fifo_lvl up to 64 byte -> N bytes
852 * 128 byte -> RDY_LVL * 2 bytes
853 * 256 byte -> RDY_LVL * 4 bytes
854 */
855 if (fifo_len == 128)
856 rdy_lv /= 2;
857 else if (fifo_len == 256)
858 rdy_lv /= 4;
859
860 val = readl(sdd->regs + S3C64XX_SPI_MODE_CFG);
861 val &= ~S3C64XX_SPI_MODE_RX_RDY_LVL;
862 val |= (rdy_lv << S3C64XX_SPI_MODE_RX_RDY_LVL_SHIFT);
863 writel(val, sdd->regs + S3C64XX_SPI_MODE_CFG);
864
865 /* Enable FIFO_RDY_EN IRQ */
866 val = readl(sdd->regs + S3C64XX_SPI_INT_EN);
867 writel((val | S3C64XX_SPI_INT_RX_FIFORDY_EN),
868 sdd->regs + S3C64XX_SPI_INT_EN);
869
870 }
871
872 spin_lock_irqsave(&sdd->lock, flags);
873
874 /* Pending only which is to be done */
875 sdd->state &= ~RXBUSY;
876 sdd->state &= ~TXBUSY;
877
878 /* Start the signals */
879 s3c64xx_spi_set_cs(spi, true);
880
881 status = s3c64xx_enable_datapath(sdd, xfer, use_dma);
882
883 spin_unlock_irqrestore(&sdd->lock, flags);
884
885 if (status) {
886 dev_err(&spi->dev, "failed to enable data path for transfer: %d\n", status);
887 break;
888 }
889
890 if (use_dma)
891 status = s3c64xx_wait_for_dma(sdd, xfer);
892 else
893 status = s3c64xx_wait_for_pio(sdd, xfer, use_irq);
894
895 if (status) {
896 dev_err(&spi->dev,
897 "I/O Error: rx-%d tx-%d rx-%c tx-%c len-%d dma-%d res-(%d)\n",
898 xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
899 (sdd->state & RXBUSY) ? 'f' : 'p',
900 (sdd->state & TXBUSY) ? 'f' : 'p',
901 xfer->len, use_dma ? 1 : 0, status);
902
903 if (use_dma) {
904 struct dma_tx_state s;
905
906 if (xfer->tx_buf && (sdd->state & TXBUSY)) {
907 dmaengine_pause(sdd->tx_dma.ch);
908 dmaengine_tx_status(sdd->tx_dma.ch, sdd->tx_dma.cookie, &s);
909 dmaengine_terminate_all(sdd->tx_dma.ch);
910 dev_err(&spi->dev, "TX residue: %d\n", s.residue);
911
912 }
913 if (xfer->rx_buf && (sdd->state & RXBUSY)) {
914 dmaengine_pause(sdd->rx_dma.ch);
915 dmaengine_tx_status(sdd->rx_dma.ch, sdd->rx_dma.cookie, &s);
916 dmaengine_terminate_all(sdd->rx_dma.ch);
917 dev_err(&spi->dev, "RX residue: %d\n", s.residue);
918 }
919 }
920 } else {
921 s3c64xx_flush_fifo(sdd);
922 }
923 if (target_len > 0) {
924 target_len -= xfer->len;
925
926 if (xfer->tx_buf)
927 xfer->tx_buf += xfer->len;
928
929 if (xfer->rx_buf)
930 xfer->rx_buf += xfer->len;
931
932 if (target_len >= fifo_len)
933 xfer->len = fifo_len - 1;
934 else
935 xfer->len = target_len;
936 }
937 } while (target_len > 0);
938
939 if (origin_len) {
940 /* Restore original xfer buffers and length */
941 xfer->tx_buf = tx_buf;
942 xfer->rx_buf = rx_buf;
943 xfer->len = origin_len;
944 }
945
946 return status;
947}
948
949static struct s3c64xx_spi_csinfo *s3c64xx_get_target_ctrldata(
950 struct spi_device *spi)
951{
952 struct s3c64xx_spi_csinfo *cs;
953 struct device_node *target_np;
954 u32 fb_delay = 0;
955
956 target_np = spi->dev.of_node;
957 if (!target_np) {
958 dev_err(&spi->dev, "device node not found\n");
959 return ERR_PTR(-EINVAL);
960 }
961
962 cs = kzalloc(sizeof(*cs), GFP_KERNEL);
963 if (!cs)
964 return ERR_PTR(-ENOMEM);
965
966 struct device_node *data_np __free(device_node) =
967 of_get_child_by_name(target_np, "controller-data");
968 if (!data_np) {
969 dev_info(&spi->dev, "feedback delay set to default (0)\n");
970 return cs;
971 }
972
973 of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay);
974 cs->fb_delay = fb_delay;
975 return cs;
976}
977
978/*
979 * Here we only check the validity of requested configuration
980 * and save the configuration in a local data-structure.
981 * The controller is actually configured only just before we
982 * get a message to transfer.
983 */
984static int s3c64xx_spi_setup(struct spi_device *spi)
985{
986 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
987 struct s3c64xx_spi_driver_data *sdd;
988 int err;
989 int div;
990
991 sdd = spi_controller_get_devdata(spi->controller);
992 if (spi->dev.of_node) {
993 cs = s3c64xx_get_target_ctrldata(spi);
994 spi->controller_data = cs;
995 }
996
997 /* NULL is fine, we just avoid using the FB delay (=0) */
998 if (IS_ERR(cs)) {
999 dev_err(&spi->dev, "No CS for SPI(%d)\n", spi_get_chipselect(spi, 0));
1000 return -ENODEV;
1001 }
1002
1003 if (!spi_get_ctldata(spi))
1004 spi_set_ctldata(spi, cs);
1005
1006 pm_runtime_get_sync(&sdd->pdev->dev);
1007
1008 div = sdd->port_conf->clk_div;
1009
1010 /* Check if we can provide the requested rate */
1011 if (!sdd->port_conf->clk_from_cmu) {
1012 u32 psr, speed;
1013
1014 /* Max possible */
1015 speed = clk_get_rate(sdd->src_clk) / div / (0 + 1);
1016
1017 if (spi->max_speed_hz > speed)
1018 spi->max_speed_hz = speed;
1019
1020 psr = clk_get_rate(sdd->src_clk) / div / spi->max_speed_hz - 1;
1021 psr &= S3C64XX_SPI_PSR_MASK;
1022 if (psr == S3C64XX_SPI_PSR_MASK)
1023 psr--;
1024
1025 speed = clk_get_rate(sdd->src_clk) / div / (psr + 1);
1026 if (spi->max_speed_hz < speed) {
1027 if (psr+1 < S3C64XX_SPI_PSR_MASK) {
1028 psr++;
1029 } else {
1030 err = -EINVAL;
1031 goto setup_exit;
1032 }
1033 }
1034
1035 speed = clk_get_rate(sdd->src_clk) / div / (psr + 1);
1036 if (spi->max_speed_hz >= speed) {
1037 spi->max_speed_hz = speed;
1038 } else {
1039 dev_err(&spi->dev, "Can't set %dHz transfer speed\n",
1040 spi->max_speed_hz);
1041 err = -EINVAL;
1042 goto setup_exit;
1043 }
1044 }
1045
1046 pm_runtime_mark_last_busy(&sdd->pdev->dev);
1047 pm_runtime_put_autosuspend(&sdd->pdev->dev);
1048 s3c64xx_spi_set_cs(spi, false);
1049
1050 return 0;
1051
1052setup_exit:
1053 pm_runtime_mark_last_busy(&sdd->pdev->dev);
1054 pm_runtime_put_autosuspend(&sdd->pdev->dev);
1055 /* setup() returns with device de-selected */
1056 s3c64xx_spi_set_cs(spi, false);
1057
1058 spi_set_ctldata(spi, NULL);
1059
1060 /* This was dynamically allocated on the DT path */
1061 if (spi->dev.of_node)
1062 kfree(cs);
1063
1064 return err;
1065}
1066
1067static void s3c64xx_spi_cleanup(struct spi_device *spi)
1068{
1069 struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi);
1070
1071 /* This was dynamically allocated on the DT path */
1072 if (spi->dev.of_node)
1073 kfree(cs);
1074
1075 spi_set_ctldata(spi, NULL);
1076}
1077
1078static irqreturn_t s3c64xx_spi_irq(int irq, void *data)
1079{
1080 struct s3c64xx_spi_driver_data *sdd = data;
1081 struct spi_controller *spi = sdd->host;
1082 unsigned int val, clr = 0;
1083
1084 val = readl(sdd->regs + S3C64XX_SPI_STATUS);
1085
1086 if (val & S3C64XX_SPI_ST_RX_OVERRUN_ERR) {
1087 clr = S3C64XX_SPI_PND_RX_OVERRUN_CLR;
1088 dev_err(&spi->dev, "RX overrun\n");
1089 }
1090 if (val & S3C64XX_SPI_ST_RX_UNDERRUN_ERR) {
1091 clr |= S3C64XX_SPI_PND_RX_UNDERRUN_CLR;
1092 dev_err(&spi->dev, "RX underrun\n");
1093 }
1094 if (val & S3C64XX_SPI_ST_TX_OVERRUN_ERR) {
1095 clr |= S3C64XX_SPI_PND_TX_OVERRUN_CLR;
1096 dev_err(&spi->dev, "TX overrun\n");
1097 }
1098 if (val & S3C64XX_SPI_ST_TX_UNDERRUN_ERR) {
1099 clr |= S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
1100 dev_err(&spi->dev, "TX underrun\n");
1101 }
1102
1103 if (val & S3C64XX_SPI_ST_RX_FIFORDY) {
1104 complete(&sdd->xfer_completion);
1105 /* No pending clear irq, turn-off INT_EN_RX_FIFO_RDY */
1106 val = readl(sdd->regs + S3C64XX_SPI_INT_EN);
1107 writel((val & ~S3C64XX_SPI_INT_RX_FIFORDY_EN),
1108 sdd->regs + S3C64XX_SPI_INT_EN);
1109 }
1110
1111 /* Clear the pending irq by setting and then clearing it */
1112 writel(clr, sdd->regs + S3C64XX_SPI_PENDING_CLR);
1113 writel(0, sdd->regs + S3C64XX_SPI_PENDING_CLR);
1114
1115 return IRQ_HANDLED;
1116}
1117
1118static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd)
1119{
1120 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
1121 void __iomem *regs = sdd->regs;
1122 unsigned int val;
1123
1124 sdd->cur_speed = 0;
1125
1126 if (sci->no_cs)
1127 writel(0, sdd->regs + S3C64XX_SPI_CS_REG);
1128 else if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
1129 writel(S3C64XX_SPI_CS_SIG_INACT, sdd->regs + S3C64XX_SPI_CS_REG);
1130
1131 /* Disable Interrupts - we use Polling if not DMA mode */
1132 writel(0, regs + S3C64XX_SPI_INT_EN);
1133
1134 if (!sdd->port_conf->clk_from_cmu)
1135 writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT,
1136 regs + S3C64XX_SPI_CLK_CFG);
1137 writel(0, regs + S3C64XX_SPI_MODE_CFG);
1138 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
1139
1140 /* Clear any irq pending bits, should set and clear the bits */
1141 val = S3C64XX_SPI_PND_RX_OVERRUN_CLR |
1142 S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
1143 S3C64XX_SPI_PND_TX_OVERRUN_CLR |
1144 S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
1145 writel(val, regs + S3C64XX_SPI_PENDING_CLR);
1146 writel(0, regs + S3C64XX_SPI_PENDING_CLR);
1147
1148 writel(0, regs + S3C64XX_SPI_SWAP_CFG);
1149
1150 val = readl(regs + S3C64XX_SPI_MODE_CFG);
1151 val &= ~S3C64XX_SPI_MODE_4BURST;
1152 val |= (S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
1153 writel(val, regs + S3C64XX_SPI_MODE_CFG);
1154
1155 s3c64xx_flush_fifo(sdd);
1156}
1157
1158#ifdef CONFIG_OF
1159static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev)
1160{
1161 struct s3c64xx_spi_info *sci;
1162 u32 temp;
1163
1164 sci = devm_kzalloc(dev, sizeof(*sci), GFP_KERNEL);
1165 if (!sci)
1166 return ERR_PTR(-ENOMEM);
1167
1168 if (of_property_read_u32(dev->of_node, "samsung,spi-src-clk", &temp)) {
1169 dev_dbg(dev, "spi bus clock parent not specified, using clock at index 0 as parent\n");
1170 sci->src_clk_nr = 0;
1171 } else {
1172 sci->src_clk_nr = temp;
1173 }
1174
1175 if (of_property_read_u32(dev->of_node, "num-cs", &temp)) {
1176 dev_dbg(dev, "number of chip select lines not specified, assuming 1 chip select line\n");
1177 sci->num_cs = 1;
1178 } else {
1179 sci->num_cs = temp;
1180 }
1181
1182 sci->no_cs = of_property_read_bool(dev->of_node, "no-cs-readback");
1183 sci->polling = !of_property_present(dev->of_node, "dmas");
1184
1185 return sci;
1186}
1187#else
1188static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev)
1189{
1190 return dev_get_platdata(dev);
1191}
1192#endif
1193
1194static inline const struct s3c64xx_spi_port_config *s3c64xx_spi_get_port_config(
1195 struct platform_device *pdev)
1196{
1197#ifdef CONFIG_OF
1198 if (pdev->dev.of_node)
1199 return of_device_get_match_data(&pdev->dev);
1200#endif
1201 return (const struct s3c64xx_spi_port_config *)platform_get_device_id(pdev)->driver_data;
1202}
1203
1204static int s3c64xx_spi_set_port_id(struct platform_device *pdev,
1205 struct s3c64xx_spi_driver_data *sdd)
1206{
1207 const struct s3c64xx_spi_port_config *port_conf = sdd->port_conf;
1208 int ret;
1209
1210 if (port_conf->rx_fifomask && port_conf->tx_fifomask)
1211 return 0;
1212
1213 if (pdev->dev.of_node) {
1214 ret = of_alias_get_id(pdev->dev.of_node, "spi");
1215 if (ret < 0)
1216 return dev_err_probe(&pdev->dev, ret,
1217 "Failed to get alias id\n");
1218 sdd->port_id = ret;
1219 } else {
1220 if (pdev->id < 0)
1221 return dev_err_probe(&pdev->dev, -EINVAL,
1222 "Negative platform ID is not allowed\n");
1223 sdd->port_id = pdev->id;
1224 }
1225
1226 return 0;
1227}
1228
1229static void s3c64xx_spi_set_fifomask(struct s3c64xx_spi_driver_data *sdd)
1230{
1231 const struct s3c64xx_spi_port_config *port_conf = sdd->port_conf;
1232
1233 if (port_conf->rx_fifomask)
1234 sdd->rx_fifomask = port_conf->rx_fifomask;
1235 else
1236 sdd->rx_fifomask = FIFO_LVL_MASK(sdd) <<
1237 port_conf->rx_lvl_offset;
1238
1239 if (port_conf->tx_fifomask)
1240 sdd->tx_fifomask = port_conf->tx_fifomask;
1241 else
1242 sdd->tx_fifomask = FIFO_LVL_MASK(sdd) <<
1243 S3C64XX_SPI_ST_TX_FIFO_LVL_SHIFT;
1244}
1245
1246static int s3c64xx_spi_probe(struct platform_device *pdev)
1247{
1248 struct resource *mem_res;
1249 struct s3c64xx_spi_driver_data *sdd;
1250 struct s3c64xx_spi_info *sci = dev_get_platdata(&pdev->dev);
1251 struct spi_controller *host;
1252 int ret, irq;
1253 char clk_name[16];
1254
1255 if (!sci && pdev->dev.of_node) {
1256 sci = s3c64xx_spi_parse_dt(&pdev->dev);
1257 if (IS_ERR(sci))
1258 return PTR_ERR(sci);
1259 }
1260
1261 if (!sci)
1262 return dev_err_probe(&pdev->dev, -ENODEV,
1263 "Platform_data missing!\n");
1264
1265 irq = platform_get_irq(pdev, 0);
1266 if (irq < 0)
1267 return irq;
1268
1269 host = devm_spi_alloc_host(&pdev->dev, sizeof(*sdd));
1270 if (!host)
1271 return dev_err_probe(&pdev->dev, -ENOMEM,
1272 "Unable to allocate SPI Host\n");
1273
1274 platform_set_drvdata(pdev, host);
1275
1276 sdd = spi_controller_get_devdata(host);
1277 sdd->port_conf = s3c64xx_spi_get_port_config(pdev);
1278 sdd->host = host;
1279 sdd->cntrlr_info = sci;
1280 sdd->pdev = pdev;
1281
1282 ret = s3c64xx_spi_set_port_id(pdev, sdd);
1283 if (ret)
1284 return ret;
1285
1286 if (sdd->port_conf->fifo_depth)
1287 sdd->fifo_depth = sdd->port_conf->fifo_depth;
1288 else if (of_property_read_u32(pdev->dev.of_node, "fifo-depth",
1289 &sdd->fifo_depth))
1290 sdd->fifo_depth = FIFO_DEPTH(sdd);
1291
1292 s3c64xx_spi_set_fifomask(sdd);
1293
1294 sdd->cur_bpw = 8;
1295
1296 sdd->tx_dma.direction = DMA_MEM_TO_DEV;
1297 sdd->rx_dma.direction = DMA_DEV_TO_MEM;
1298
1299 host->dev.of_node = pdev->dev.of_node;
1300 host->bus_num = -1;
1301 host->setup = s3c64xx_spi_setup;
1302 host->cleanup = s3c64xx_spi_cleanup;
1303 host->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer;
1304 host->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer;
1305 host->prepare_message = s3c64xx_spi_prepare_message;
1306 host->transfer_one = s3c64xx_spi_transfer_one;
1307 host->max_transfer_size = s3c64xx_spi_max_transfer_size;
1308 host->num_chipselect = sci->num_cs;
1309 host->use_gpio_descriptors = true;
1310 host->dma_alignment = 8;
1311 host->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) |
1312 SPI_BPW_MASK(8);
1313 /* the spi->mode bits understood by this driver: */
1314 host->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1315 if (sdd->port_conf->has_loopback)
1316 host->mode_bits |= SPI_LOOP;
1317 host->auto_runtime_pm = true;
1318 if (!is_polling(sdd))
1319 host->can_dma = s3c64xx_spi_can_dma;
1320
1321 sdd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem_res);
1322 if (IS_ERR(sdd->regs))
1323 return PTR_ERR(sdd->regs);
1324 sdd->sfr_start = mem_res->start;
1325
1326 if (sci->cfg_gpio && sci->cfg_gpio())
1327 return dev_err_probe(&pdev->dev, -EBUSY,
1328 "Unable to config gpio\n");
1329
1330 /* Setup clocks */
1331 sdd->clk = devm_clk_get_enabled(&pdev->dev, "spi");
1332 if (IS_ERR(sdd->clk))
1333 return dev_err_probe(&pdev->dev, PTR_ERR(sdd->clk),
1334 "Unable to acquire clock 'spi'\n");
1335
1336 sprintf(clk_name, "spi_busclk%d", sci->src_clk_nr);
1337 sdd->src_clk = devm_clk_get_enabled(&pdev->dev, clk_name);
1338 if (IS_ERR(sdd->src_clk))
1339 return dev_err_probe(&pdev->dev, PTR_ERR(sdd->src_clk),
1340 "Unable to acquire clock '%s'\n",
1341 clk_name);
1342
1343 if (sdd->port_conf->clk_ioclk) {
1344 sdd->ioclk = devm_clk_get_enabled(&pdev->dev, "spi_ioclk");
1345 if (IS_ERR(sdd->ioclk))
1346 return dev_err_probe(&pdev->dev, PTR_ERR(sdd->ioclk),
1347 "Unable to acquire 'ioclk'\n");
1348 }
1349
1350 pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
1351 pm_runtime_use_autosuspend(&pdev->dev);
1352 pm_runtime_set_active(&pdev->dev);
1353 pm_runtime_enable(&pdev->dev);
1354 pm_runtime_get_sync(&pdev->dev);
1355
1356 /* Setup Default Mode */
1357 s3c64xx_spi_hwinit(sdd);
1358
1359 spin_lock_init(&sdd->lock);
1360 init_completion(&sdd->xfer_completion);
1361
1362 ret = devm_request_irq(&pdev->dev, irq, s3c64xx_spi_irq, 0,
1363 "spi-s3c64xx", sdd);
1364 if (ret != 0) {
1365 dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n",
1366 irq, ret);
1367 goto err_pm_put;
1368 }
1369
1370 writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN |
1371 S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
1372 sdd->regs + S3C64XX_SPI_INT_EN);
1373
1374 ret = devm_spi_register_controller(&pdev->dev, host);
1375 if (ret != 0) {
1376 dev_err(&pdev->dev, "cannot register SPI host: %d\n", ret);
1377 goto err_pm_put;
1378 }
1379
1380 dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Targets attached\n",
1381 host->bus_num, host->num_chipselect);
1382 dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tFIFO %dbytes\n",
1383 mem_res, sdd->fifo_depth);
1384
1385 pm_runtime_mark_last_busy(&pdev->dev);
1386 pm_runtime_put_autosuspend(&pdev->dev);
1387
1388 return 0;
1389
1390err_pm_put:
1391 pm_runtime_put_noidle(&pdev->dev);
1392 pm_runtime_disable(&pdev->dev);
1393 pm_runtime_set_suspended(&pdev->dev);
1394
1395 return ret;
1396}
1397
1398static void s3c64xx_spi_remove(struct platform_device *pdev)
1399{
1400 struct spi_controller *host = platform_get_drvdata(pdev);
1401 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
1402
1403 pm_runtime_get_sync(&pdev->dev);
1404
1405 writel(0, sdd->regs + S3C64XX_SPI_INT_EN);
1406
1407 if (!is_polling(sdd)) {
1408 dma_release_channel(sdd->rx_dma.ch);
1409 dma_release_channel(sdd->tx_dma.ch);
1410 }
1411
1412 pm_runtime_put_noidle(&pdev->dev);
1413 pm_runtime_disable(&pdev->dev);
1414 pm_runtime_set_suspended(&pdev->dev);
1415}
1416
1417#ifdef CONFIG_PM_SLEEP
1418static int s3c64xx_spi_suspend(struct device *dev)
1419{
1420 struct spi_controller *host = dev_get_drvdata(dev);
1421 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
1422 int ret;
1423
1424 ret = spi_controller_suspend(host);
1425 if (ret)
1426 return ret;
1427
1428 ret = pm_runtime_force_suspend(dev);
1429 if (ret < 0)
1430 return ret;
1431
1432 sdd->cur_speed = 0; /* Output Clock is stopped */
1433
1434 return 0;
1435}
1436
1437static int s3c64xx_spi_resume(struct device *dev)
1438{
1439 struct spi_controller *host = dev_get_drvdata(dev);
1440 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
1441 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
1442 int ret;
1443
1444 if (sci->cfg_gpio)
1445 sci->cfg_gpio();
1446
1447 ret = pm_runtime_force_resume(dev);
1448 if (ret < 0)
1449 return ret;
1450
1451 return spi_controller_resume(host);
1452}
1453#endif /* CONFIG_PM_SLEEP */
1454
1455#ifdef CONFIG_PM
1456static int s3c64xx_spi_runtime_suspend(struct device *dev)
1457{
1458 struct spi_controller *host = dev_get_drvdata(dev);
1459 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
1460
1461 clk_disable_unprepare(sdd->clk);
1462 clk_disable_unprepare(sdd->src_clk);
1463 clk_disable_unprepare(sdd->ioclk);
1464
1465 return 0;
1466}
1467
1468static int s3c64xx_spi_runtime_resume(struct device *dev)
1469{
1470 struct spi_controller *host = dev_get_drvdata(dev);
1471 struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
1472 int ret;
1473
1474 if (sdd->port_conf->clk_ioclk) {
1475 ret = clk_prepare_enable(sdd->ioclk);
1476 if (ret != 0)
1477 return ret;
1478 }
1479
1480 ret = clk_prepare_enable(sdd->src_clk);
1481 if (ret != 0)
1482 goto err_disable_ioclk;
1483
1484 ret = clk_prepare_enable(sdd->clk);
1485 if (ret != 0)
1486 goto err_disable_src_clk;
1487
1488 s3c64xx_spi_hwinit(sdd);
1489
1490 writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN |
1491 S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
1492 sdd->regs + S3C64XX_SPI_INT_EN);
1493
1494 return 0;
1495
1496err_disable_src_clk:
1497 clk_disable_unprepare(sdd->src_clk);
1498err_disable_ioclk:
1499 clk_disable_unprepare(sdd->ioclk);
1500
1501 return ret;
1502}
1503#endif /* CONFIG_PM */
1504
1505static const struct dev_pm_ops s3c64xx_spi_pm = {
1506 SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume)
1507 SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend,
1508 s3c64xx_spi_runtime_resume, NULL)
1509};
1510
1511static const struct s3c64xx_spi_port_config s3c2443_spi_port_config = {
1512 /* fifo_lvl_mask is deprecated. Use {rx, tx}_fifomask instead. */
1513 .fifo_lvl_mask = { 0x7f },
1514 /* rx_lvl_offset is deprecated. Use {rx, tx}_fifomask instead. */
1515 .rx_lvl_offset = 13,
1516 .tx_st_done = 21,
1517 .clk_div = 2,
1518 .high_speed = true,
1519};
1520
1521static const struct s3c64xx_spi_port_config s3c6410_spi_port_config = {
1522 /* fifo_lvl_mask is deprecated. Use {rx, tx}_fifomask instead. */
1523 .fifo_lvl_mask = { 0x7f, 0x7F },
1524 /* rx_lvl_offset is deprecated. Use {rx, tx}_fifomask instead. */
1525 .rx_lvl_offset = 13,
1526 .tx_st_done = 21,
1527 .clk_div = 2,
1528};
1529
1530static const struct s3c64xx_spi_port_config s5pv210_spi_port_config = {
1531 /* fifo_lvl_mask is deprecated. Use {rx, tx}_fifomask instead. */
1532 .fifo_lvl_mask = { 0x1ff, 0x7F },
1533 /* rx_lvl_offset is deprecated. Use {rx, tx}_fifomask instead. */
1534 .rx_lvl_offset = 15,
1535 .tx_st_done = 25,
1536 .clk_div = 2,
1537 .high_speed = true,
1538};
1539
1540static const struct s3c64xx_spi_port_config exynos4_spi_port_config = {
1541 /* fifo_lvl_mask is deprecated. Use {rx, tx}_fifomask instead. */
1542 .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F },
1543 /* rx_lvl_offset is deprecated. Use {rx, tx}_fifomask instead. */
1544 .rx_lvl_offset = 15,
1545 .tx_st_done = 25,
1546 .clk_div = 2,
1547 .high_speed = true,
1548 .clk_from_cmu = true,
1549 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1550};
1551
1552static const struct s3c64xx_spi_port_config exynos7_spi_port_config = {
1553 /* fifo_lvl_mask is deprecated. Use {rx, tx}_fifomask instead. */
1554 .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F, 0x7F, 0x7F, 0x1ff},
1555 /* rx_lvl_offset is deprecated. Use {rx, tx}_fifomask instead. */
1556 .rx_lvl_offset = 15,
1557 .tx_st_done = 25,
1558 .clk_div = 2,
1559 .high_speed = true,
1560 .clk_from_cmu = true,
1561 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1562};
1563
1564static const struct s3c64xx_spi_port_config exynos5433_spi_port_config = {
1565 /* fifo_lvl_mask is deprecated. Use {rx, tx}_fifomask instead. */
1566 .fifo_lvl_mask = { 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff},
1567 /* rx_lvl_offset is deprecated. Use {rx, tx}_fifomask instead. */
1568 .rx_lvl_offset = 15,
1569 .tx_st_done = 25,
1570 .clk_div = 2,
1571 .high_speed = true,
1572 .clk_from_cmu = true,
1573 .clk_ioclk = true,
1574 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1575};
1576
1577static const struct s3c64xx_spi_port_config exynos850_spi_port_config = {
1578 .fifo_depth = 64,
1579 .rx_fifomask = S3C64XX_SPI_ST_RX_FIFO_RDY_V2,
1580 .tx_fifomask = S3C64XX_SPI_ST_TX_FIFO_RDY_V2,
1581 .tx_st_done = 25,
1582 .clk_div = 4,
1583 .high_speed = true,
1584 .clk_from_cmu = true,
1585 .has_loopback = true,
1586 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1587};
1588
1589static const struct s3c64xx_spi_port_config exynosautov9_spi_port_config = {
1590 /* fifo_lvl_mask is deprecated. Use {rx, tx}_fifomask instead. */
1591 .fifo_lvl_mask = { 0x1ff, 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff, 0x7f,
1592 0x7f, 0x7f, 0x7f, 0x7f},
1593 /* rx_lvl_offset is deprecated. Use {rx, tx}_fifomask instead. */
1594 .rx_lvl_offset = 15,
1595 .tx_st_done = 25,
1596 .clk_div = 4,
1597 .high_speed = true,
1598 .clk_from_cmu = true,
1599 .clk_ioclk = true,
1600 .has_loopback = true,
1601 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1602};
1603
1604static const struct s3c64xx_spi_port_config fsd_spi_port_config = {
1605 /* fifo_lvl_mask is deprecated. Use {rx, tx}_fifomask instead. */
1606 .fifo_lvl_mask = { 0x7f, 0x7f, 0x7f, 0x7f, 0x7f},
1607 /* rx_lvl_offset is deprecated. Use {rx, tx}_fifomask instead. */
1608 .rx_lvl_offset = 15,
1609 .tx_st_done = 25,
1610 .clk_div = 2,
1611 .high_speed = true,
1612 .clk_from_cmu = true,
1613 .clk_ioclk = false,
1614 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1615};
1616
1617static const struct s3c64xx_spi_port_config gs101_spi_port_config = {
1618 .fifo_depth = 64,
1619 .rx_fifomask = S3C64XX_SPI_ST_RX_FIFO_RDY_V2,
1620 .tx_fifomask = S3C64XX_SPI_ST_TX_FIFO_RDY_V2,
1621 .tx_st_done = 25,
1622 .clk_div = 4,
1623 .high_speed = true,
1624 .clk_from_cmu = true,
1625 .has_loopback = true,
1626 .use_32bit_io = true,
1627 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1628};
1629
1630static const struct platform_device_id s3c64xx_spi_driver_ids[] = {
1631 {
1632 .name = "s3c2443-spi",
1633 .driver_data = (kernel_ulong_t)&s3c2443_spi_port_config,
1634 }, {
1635 .name = "s3c6410-spi",
1636 .driver_data = (kernel_ulong_t)&s3c6410_spi_port_config,
1637 },
1638 { },
1639};
1640MODULE_DEVICE_TABLE(platform, s3c64xx_spi_driver_ids);
1641
1642static const struct of_device_id s3c64xx_spi_dt_match[] = {
1643 { .compatible = "google,gs101-spi",
1644 .data = &gs101_spi_port_config,
1645 },
1646 { .compatible = "samsung,s3c2443-spi",
1647 .data = &s3c2443_spi_port_config,
1648 },
1649 { .compatible = "samsung,s3c6410-spi",
1650 .data = &s3c6410_spi_port_config,
1651 },
1652 { .compatible = "samsung,s5pv210-spi",
1653 .data = &s5pv210_spi_port_config,
1654 },
1655 { .compatible = "samsung,exynos4210-spi",
1656 .data = &exynos4_spi_port_config,
1657 },
1658 { .compatible = "samsung,exynos7-spi",
1659 .data = &exynos7_spi_port_config,
1660 },
1661 { .compatible = "samsung,exynos5433-spi",
1662 .data = &exynos5433_spi_port_config,
1663 },
1664 { .compatible = "samsung,exynos850-spi",
1665 .data = &exynos850_spi_port_config,
1666 },
1667 { .compatible = "samsung,exynosautov9-spi",
1668 .data = &exynosautov9_spi_port_config,
1669 },
1670 { .compatible = "tesla,fsd-spi",
1671 .data = &fsd_spi_port_config,
1672 },
1673 { },
1674};
1675MODULE_DEVICE_TABLE(of, s3c64xx_spi_dt_match);
1676
1677static struct platform_driver s3c64xx_spi_driver = {
1678 .driver = {
1679 .name = "s3c64xx-spi",
1680 .pm = &s3c64xx_spi_pm,
1681 .of_match_table = of_match_ptr(s3c64xx_spi_dt_match),
1682 },
1683 .probe = s3c64xx_spi_probe,
1684 .remove = s3c64xx_spi_remove,
1685 .id_table = s3c64xx_spi_driver_ids,
1686};
1687MODULE_ALIAS("platform:s3c64xx-spi");
1688
1689module_platform_driver(s3c64xx_spi_driver);
1690
1691MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
1692MODULE_DESCRIPTION("S3C64XX SPI Controller Driver");
1693MODULE_LICENSE("GPL");