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1/*
2 * Copyright (C) 2009 Samsung Electronics Ltd.
3 * Jaswinder Singh <jassi.brar@samsung.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20#include <linux/init.h>
21#include <linux/module.h>
22#include <linux/workqueue.h>
23#include <linux/interrupt.h>
24#include <linux/delay.h>
25#include <linux/clk.h>
26#include <linux/dma-mapping.h>
27#include <linux/platform_device.h>
28#include <linux/pm_runtime.h>
29#include <linux/spi/spi.h>
30
31#include <mach/dma.h>
32#include <plat/s3c64xx-spi.h>
33
34/* Registers and bit-fields */
35
36#define S3C64XX_SPI_CH_CFG 0x00
37#define S3C64XX_SPI_CLK_CFG 0x04
38#define S3C64XX_SPI_MODE_CFG 0x08
39#define S3C64XX_SPI_SLAVE_SEL 0x0C
40#define S3C64XX_SPI_INT_EN 0x10
41#define S3C64XX_SPI_STATUS 0x14
42#define S3C64XX_SPI_TX_DATA 0x18
43#define S3C64XX_SPI_RX_DATA 0x1C
44#define S3C64XX_SPI_PACKET_CNT 0x20
45#define S3C64XX_SPI_PENDING_CLR 0x24
46#define S3C64XX_SPI_SWAP_CFG 0x28
47#define S3C64XX_SPI_FB_CLK 0x2C
48
49#define S3C64XX_SPI_CH_HS_EN (1<<6) /* High Speed Enable */
50#define S3C64XX_SPI_CH_SW_RST (1<<5)
51#define S3C64XX_SPI_CH_SLAVE (1<<4)
52#define S3C64XX_SPI_CPOL_L (1<<3)
53#define S3C64XX_SPI_CPHA_B (1<<2)
54#define S3C64XX_SPI_CH_RXCH_ON (1<<1)
55#define S3C64XX_SPI_CH_TXCH_ON (1<<0)
56
57#define S3C64XX_SPI_CLKSEL_SRCMSK (3<<9)
58#define S3C64XX_SPI_CLKSEL_SRCSHFT 9
59#define S3C64XX_SPI_ENCLK_ENABLE (1<<8)
60#define S3C64XX_SPI_PSR_MASK 0xff
61
62#define S3C64XX_SPI_MODE_CH_TSZ_BYTE (0<<29)
63#define S3C64XX_SPI_MODE_CH_TSZ_HALFWORD (1<<29)
64#define S3C64XX_SPI_MODE_CH_TSZ_WORD (2<<29)
65#define S3C64XX_SPI_MODE_CH_TSZ_MASK (3<<29)
66#define S3C64XX_SPI_MODE_BUS_TSZ_BYTE (0<<17)
67#define S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD (1<<17)
68#define S3C64XX_SPI_MODE_BUS_TSZ_WORD (2<<17)
69#define S3C64XX_SPI_MODE_BUS_TSZ_MASK (3<<17)
70#define S3C64XX_SPI_MODE_RXDMA_ON (1<<2)
71#define S3C64XX_SPI_MODE_TXDMA_ON (1<<1)
72#define S3C64XX_SPI_MODE_4BURST (1<<0)
73
74#define S3C64XX_SPI_SLAVE_AUTO (1<<1)
75#define S3C64XX_SPI_SLAVE_SIG_INACT (1<<0)
76
77#define S3C64XX_SPI_ACT(c) writel(0, (c)->regs + S3C64XX_SPI_SLAVE_SEL)
78
79#define S3C64XX_SPI_DEACT(c) writel(S3C64XX_SPI_SLAVE_SIG_INACT, \
80 (c)->regs + S3C64XX_SPI_SLAVE_SEL)
81
82#define S3C64XX_SPI_INT_TRAILING_EN (1<<6)
83#define S3C64XX_SPI_INT_RX_OVERRUN_EN (1<<5)
84#define S3C64XX_SPI_INT_RX_UNDERRUN_EN (1<<4)
85#define S3C64XX_SPI_INT_TX_OVERRUN_EN (1<<3)
86#define S3C64XX_SPI_INT_TX_UNDERRUN_EN (1<<2)
87#define S3C64XX_SPI_INT_RX_FIFORDY_EN (1<<1)
88#define S3C64XX_SPI_INT_TX_FIFORDY_EN (1<<0)
89
90#define S3C64XX_SPI_ST_RX_OVERRUN_ERR (1<<5)
91#define S3C64XX_SPI_ST_RX_UNDERRUN_ERR (1<<4)
92#define S3C64XX_SPI_ST_TX_OVERRUN_ERR (1<<3)
93#define S3C64XX_SPI_ST_TX_UNDERRUN_ERR (1<<2)
94#define S3C64XX_SPI_ST_RX_FIFORDY (1<<1)
95#define S3C64XX_SPI_ST_TX_FIFORDY (1<<0)
96
97#define S3C64XX_SPI_PACKET_CNT_EN (1<<16)
98
99#define S3C64XX_SPI_PND_TX_UNDERRUN_CLR (1<<4)
100#define S3C64XX_SPI_PND_TX_OVERRUN_CLR (1<<3)
101#define S3C64XX_SPI_PND_RX_UNDERRUN_CLR (1<<2)
102#define S3C64XX_SPI_PND_RX_OVERRUN_CLR (1<<1)
103#define S3C64XX_SPI_PND_TRAILING_CLR (1<<0)
104
105#define S3C64XX_SPI_SWAP_RX_HALF_WORD (1<<7)
106#define S3C64XX_SPI_SWAP_RX_BYTE (1<<6)
107#define S3C64XX_SPI_SWAP_RX_BIT (1<<5)
108#define S3C64XX_SPI_SWAP_RX_EN (1<<4)
109#define S3C64XX_SPI_SWAP_TX_HALF_WORD (1<<3)
110#define S3C64XX_SPI_SWAP_TX_BYTE (1<<2)
111#define S3C64XX_SPI_SWAP_TX_BIT (1<<1)
112#define S3C64XX_SPI_SWAP_TX_EN (1<<0)
113
114#define S3C64XX_SPI_FBCLK_MSK (3<<0)
115
116#define S3C64XX_SPI_ST_TRLCNTZ(v, i) ((((v) >> (i)->rx_lvl_offset) & \
117 (((i)->fifo_lvl_mask + 1))) \
118 ? 1 : 0)
119
120#define S3C64XX_SPI_ST_TX_DONE(v, i) (((v) & (1 << (i)->tx_st_done)) ? 1 : 0)
121#define TX_FIFO_LVL(v, i) (((v) >> 6) & (i)->fifo_lvl_mask)
122#define RX_FIFO_LVL(v, i) (((v) >> (i)->rx_lvl_offset) & (i)->fifo_lvl_mask)
123
124#define S3C64XX_SPI_MAX_TRAILCNT 0x3ff
125#define S3C64XX_SPI_TRAILCNT_OFF 19
126
127#define S3C64XX_SPI_TRAILCNT S3C64XX_SPI_MAX_TRAILCNT
128
129#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
130
131#define RXBUSY (1<<2)
132#define TXBUSY (1<<3)
133
134struct s3c64xx_spi_dma_data {
135 unsigned ch;
136 enum dma_data_direction direction;
137 enum dma_ch dmach;
138};
139
140/**
141 * struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver.
142 * @clk: Pointer to the spi clock.
143 * @src_clk: Pointer to the clock used to generate SPI signals.
144 * @master: Pointer to the SPI Protocol master.
145 * @cntrlr_info: Platform specific data for the controller this driver manages.
146 * @tgl_spi: Pointer to the last CS left untoggled by the cs_change hint.
147 * @queue: To log SPI xfer requests.
148 * @lock: Controller specific lock.
149 * @state: Set of FLAGS to indicate status.
150 * @rx_dmach: Controller's DMA channel for Rx.
151 * @tx_dmach: Controller's DMA channel for Tx.
152 * @sfr_start: BUS address of SPI controller regs.
153 * @regs: Pointer to ioremap'ed controller registers.
154 * @irq: interrupt
155 * @xfer_completion: To indicate completion of xfer task.
156 * @cur_mode: Stores the active configuration of the controller.
157 * @cur_bpw: Stores the active bits per word settings.
158 * @cur_speed: Stores the active xfer clock speed.
159 */
160struct s3c64xx_spi_driver_data {
161 void __iomem *regs;
162 struct clk *clk;
163 struct clk *src_clk;
164 struct platform_device *pdev;
165 struct spi_master *master;
166 struct s3c64xx_spi_info *cntrlr_info;
167 struct spi_device *tgl_spi;
168 struct list_head queue;
169 spinlock_t lock;
170 unsigned long sfr_start;
171 struct completion xfer_completion;
172 unsigned state;
173 unsigned cur_mode, cur_bpw;
174 unsigned cur_speed;
175 struct s3c64xx_spi_dma_data rx_dma;
176 struct s3c64xx_spi_dma_data tx_dma;
177 struct samsung_dma_ops *ops;
178};
179
180static struct s3c2410_dma_client s3c64xx_spi_dma_client = {
181 .name = "samsung-spi-dma",
182};
183
184static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
185{
186 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
187 void __iomem *regs = sdd->regs;
188 unsigned long loops;
189 u32 val;
190
191 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
192
193 val = readl(regs + S3C64XX_SPI_CH_CFG);
194 val |= S3C64XX_SPI_CH_SW_RST;
195 val &= ~S3C64XX_SPI_CH_HS_EN;
196 writel(val, regs + S3C64XX_SPI_CH_CFG);
197
198 /* Flush TxFIFO*/
199 loops = msecs_to_loops(1);
200 do {
201 val = readl(regs + S3C64XX_SPI_STATUS);
202 } while (TX_FIFO_LVL(val, sci) && loops--);
203
204 if (loops == 0)
205 dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n");
206
207 /* Flush RxFIFO*/
208 loops = msecs_to_loops(1);
209 do {
210 val = readl(regs + S3C64XX_SPI_STATUS);
211 if (RX_FIFO_LVL(val, sci))
212 readl(regs + S3C64XX_SPI_RX_DATA);
213 else
214 break;
215 } while (loops--);
216
217 if (loops == 0)
218 dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n");
219
220 val = readl(regs + S3C64XX_SPI_CH_CFG);
221 val &= ~S3C64XX_SPI_CH_SW_RST;
222 writel(val, regs + S3C64XX_SPI_CH_CFG);
223
224 val = readl(regs + S3C64XX_SPI_MODE_CFG);
225 val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
226 writel(val, regs + S3C64XX_SPI_MODE_CFG);
227
228 val = readl(regs + S3C64XX_SPI_CH_CFG);
229 val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON);
230 writel(val, regs + S3C64XX_SPI_CH_CFG);
231}
232
233static void s3c64xx_spi_dmacb(void *data)
234{
235 struct s3c64xx_spi_driver_data *sdd;
236 struct s3c64xx_spi_dma_data *dma = data;
237 unsigned long flags;
238
239 if (dma->direction == DMA_DEV_TO_MEM)
240 sdd = container_of(data,
241 struct s3c64xx_spi_driver_data, rx_dma);
242 else
243 sdd = container_of(data,
244 struct s3c64xx_spi_driver_data, tx_dma);
245
246 spin_lock_irqsave(&sdd->lock, flags);
247
248 if (dma->direction == DMA_DEV_TO_MEM) {
249 sdd->state &= ~RXBUSY;
250 if (!(sdd->state & TXBUSY))
251 complete(&sdd->xfer_completion);
252 } else {
253 sdd->state &= ~TXBUSY;
254 if (!(sdd->state & RXBUSY))
255 complete(&sdd->xfer_completion);
256 }
257
258 spin_unlock_irqrestore(&sdd->lock, flags);
259}
260
261static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
262 unsigned len, dma_addr_t buf)
263{
264 struct s3c64xx_spi_driver_data *sdd;
265 struct samsung_dma_prep_info info;
266
267 if (dma->direction == DMA_DEV_TO_MEM)
268 sdd = container_of((void *)dma,
269 struct s3c64xx_spi_driver_data, rx_dma);
270 else
271 sdd = container_of((void *)dma,
272 struct s3c64xx_spi_driver_data, tx_dma);
273
274 info.cap = DMA_SLAVE;
275 info.len = len;
276 info.fp = s3c64xx_spi_dmacb;
277 info.fp_param = dma;
278 info.direction = dma->direction;
279 info.buf = buf;
280
281 sdd->ops->prepare(dma->ch, &info);
282 sdd->ops->trigger(dma->ch);
283}
284
285static int acquire_dma(struct s3c64xx_spi_driver_data *sdd)
286{
287 struct samsung_dma_info info;
288
289 sdd->ops = samsung_dma_get_ops();
290
291 info.cap = DMA_SLAVE;
292 info.client = &s3c64xx_spi_dma_client;
293 info.width = sdd->cur_bpw / 8;
294
295 info.direction = sdd->rx_dma.direction;
296 info.fifo = sdd->sfr_start + S3C64XX_SPI_RX_DATA;
297 sdd->rx_dma.ch = sdd->ops->request(sdd->rx_dma.dmach, &info);
298 info.direction = sdd->tx_dma.direction;
299 info.fifo = sdd->sfr_start + S3C64XX_SPI_TX_DATA;
300 sdd->tx_dma.ch = sdd->ops->request(sdd->tx_dma.dmach, &info);
301
302 return 1;
303}
304
305static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
306 struct spi_device *spi,
307 struct spi_transfer *xfer, int dma_mode)
308{
309 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
310 void __iomem *regs = sdd->regs;
311 u32 modecfg, chcfg;
312
313 modecfg = readl(regs + S3C64XX_SPI_MODE_CFG);
314 modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
315
316 chcfg = readl(regs + S3C64XX_SPI_CH_CFG);
317 chcfg &= ~S3C64XX_SPI_CH_TXCH_ON;
318
319 if (dma_mode) {
320 chcfg &= ~S3C64XX_SPI_CH_RXCH_ON;
321 } else {
322 /* Always shift in data in FIFO, even if xfer is Tx only,
323 * this helps setting PCKT_CNT value for generating clocks
324 * as exactly needed.
325 */
326 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
327 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
328 | S3C64XX_SPI_PACKET_CNT_EN,
329 regs + S3C64XX_SPI_PACKET_CNT);
330 }
331
332 if (xfer->tx_buf != NULL) {
333 sdd->state |= TXBUSY;
334 chcfg |= S3C64XX_SPI_CH_TXCH_ON;
335 if (dma_mode) {
336 modecfg |= S3C64XX_SPI_MODE_TXDMA_ON;
337 prepare_dma(&sdd->tx_dma, xfer->len, xfer->tx_dma);
338 } else {
339 switch (sdd->cur_bpw) {
340 case 32:
341 iowrite32_rep(regs + S3C64XX_SPI_TX_DATA,
342 xfer->tx_buf, xfer->len / 4);
343 break;
344 case 16:
345 iowrite16_rep(regs + S3C64XX_SPI_TX_DATA,
346 xfer->tx_buf, xfer->len / 2);
347 break;
348 default:
349 iowrite8_rep(regs + S3C64XX_SPI_TX_DATA,
350 xfer->tx_buf, xfer->len);
351 break;
352 }
353 }
354 }
355
356 if (xfer->rx_buf != NULL) {
357 sdd->state |= RXBUSY;
358
359 if (sci->high_speed && sdd->cur_speed >= 30000000UL
360 && !(sdd->cur_mode & SPI_CPHA))
361 chcfg |= S3C64XX_SPI_CH_HS_EN;
362
363 if (dma_mode) {
364 modecfg |= S3C64XX_SPI_MODE_RXDMA_ON;
365 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
366 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
367 | S3C64XX_SPI_PACKET_CNT_EN,
368 regs + S3C64XX_SPI_PACKET_CNT);
369 prepare_dma(&sdd->rx_dma, xfer->len, xfer->rx_dma);
370 }
371 }
372
373 writel(modecfg, regs + S3C64XX_SPI_MODE_CFG);
374 writel(chcfg, regs + S3C64XX_SPI_CH_CFG);
375}
376
377static inline void enable_cs(struct s3c64xx_spi_driver_data *sdd,
378 struct spi_device *spi)
379{
380 struct s3c64xx_spi_csinfo *cs;
381
382 if (sdd->tgl_spi != NULL) { /* If last device toggled after mssg */
383 if (sdd->tgl_spi != spi) { /* if last mssg on diff device */
384 /* Deselect the last toggled device */
385 cs = sdd->tgl_spi->controller_data;
386 cs->set_level(cs->line,
387 spi->mode & SPI_CS_HIGH ? 0 : 1);
388 }
389 sdd->tgl_spi = NULL;
390 }
391
392 cs = spi->controller_data;
393 cs->set_level(cs->line, spi->mode & SPI_CS_HIGH ? 1 : 0);
394}
395
396static int wait_for_xfer(struct s3c64xx_spi_driver_data *sdd,
397 struct spi_transfer *xfer, int dma_mode)
398{
399 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
400 void __iomem *regs = sdd->regs;
401 unsigned long val;
402 int ms;
403
404 /* millisecs to xfer 'len' bytes @ 'cur_speed' */
405 ms = xfer->len * 8 * 1000 / sdd->cur_speed;
406 ms += 10; /* some tolerance */
407
408 if (dma_mode) {
409 val = msecs_to_jiffies(ms) + 10;
410 val = wait_for_completion_timeout(&sdd->xfer_completion, val);
411 } else {
412 u32 status;
413 val = msecs_to_loops(ms);
414 do {
415 status = readl(regs + S3C64XX_SPI_STATUS);
416 } while (RX_FIFO_LVL(status, sci) < xfer->len && --val);
417 }
418
419 if (!val)
420 return -EIO;
421
422 if (dma_mode) {
423 u32 status;
424
425 /*
426 * DmaTx returns after simply writing data in the FIFO,
427 * w/o waiting for real transmission on the bus to finish.
428 * DmaRx returns only after Dma read data from FIFO which
429 * needs bus transmission to finish, so we don't worry if
430 * Xfer involved Rx(with or without Tx).
431 */
432 if (xfer->rx_buf == NULL) {
433 val = msecs_to_loops(10);
434 status = readl(regs + S3C64XX_SPI_STATUS);
435 while ((TX_FIFO_LVL(status, sci)
436 || !S3C64XX_SPI_ST_TX_DONE(status, sci))
437 && --val) {
438 cpu_relax();
439 status = readl(regs + S3C64XX_SPI_STATUS);
440 }
441
442 if (!val)
443 return -EIO;
444 }
445 } else {
446 /* If it was only Tx */
447 if (xfer->rx_buf == NULL) {
448 sdd->state &= ~TXBUSY;
449 return 0;
450 }
451
452 switch (sdd->cur_bpw) {
453 case 32:
454 ioread32_rep(regs + S3C64XX_SPI_RX_DATA,
455 xfer->rx_buf, xfer->len / 4);
456 break;
457 case 16:
458 ioread16_rep(regs + S3C64XX_SPI_RX_DATA,
459 xfer->rx_buf, xfer->len / 2);
460 break;
461 default:
462 ioread8_rep(regs + S3C64XX_SPI_RX_DATA,
463 xfer->rx_buf, xfer->len);
464 break;
465 }
466 sdd->state &= ~RXBUSY;
467 }
468
469 return 0;
470}
471
472static inline void disable_cs(struct s3c64xx_spi_driver_data *sdd,
473 struct spi_device *spi)
474{
475 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
476
477 if (sdd->tgl_spi == spi)
478 sdd->tgl_spi = NULL;
479
480 cs->set_level(cs->line, spi->mode & SPI_CS_HIGH ? 0 : 1);
481}
482
483static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
484{
485 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
486 void __iomem *regs = sdd->regs;
487 u32 val;
488
489 /* Disable Clock */
490 if (sci->clk_from_cmu) {
491 clk_disable(sdd->src_clk);
492 } else {
493 val = readl(regs + S3C64XX_SPI_CLK_CFG);
494 val &= ~S3C64XX_SPI_ENCLK_ENABLE;
495 writel(val, regs + S3C64XX_SPI_CLK_CFG);
496 }
497
498 /* Set Polarity and Phase */
499 val = readl(regs + S3C64XX_SPI_CH_CFG);
500 val &= ~(S3C64XX_SPI_CH_SLAVE |
501 S3C64XX_SPI_CPOL_L |
502 S3C64XX_SPI_CPHA_B);
503
504 if (sdd->cur_mode & SPI_CPOL)
505 val |= S3C64XX_SPI_CPOL_L;
506
507 if (sdd->cur_mode & SPI_CPHA)
508 val |= S3C64XX_SPI_CPHA_B;
509
510 writel(val, regs + S3C64XX_SPI_CH_CFG);
511
512 /* Set Channel & DMA Mode */
513 val = readl(regs + S3C64XX_SPI_MODE_CFG);
514 val &= ~(S3C64XX_SPI_MODE_BUS_TSZ_MASK
515 | S3C64XX_SPI_MODE_CH_TSZ_MASK);
516
517 switch (sdd->cur_bpw) {
518 case 32:
519 val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD;
520 val |= S3C64XX_SPI_MODE_CH_TSZ_WORD;
521 break;
522 case 16:
523 val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD;
524 val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD;
525 break;
526 default:
527 val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE;
528 val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE;
529 break;
530 }
531
532 writel(val, regs + S3C64XX_SPI_MODE_CFG);
533
534 if (sci->clk_from_cmu) {
535 /* Configure Clock */
536 /* There is half-multiplier before the SPI */
537 clk_set_rate(sdd->src_clk, sdd->cur_speed * 2);
538 /* Enable Clock */
539 clk_enable(sdd->src_clk);
540 } else {
541 /* Configure Clock */
542 val = readl(regs + S3C64XX_SPI_CLK_CFG);
543 val &= ~S3C64XX_SPI_PSR_MASK;
544 val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1)
545 & S3C64XX_SPI_PSR_MASK);
546 writel(val, regs + S3C64XX_SPI_CLK_CFG);
547
548 /* Enable Clock */
549 val = readl(regs + S3C64XX_SPI_CLK_CFG);
550 val |= S3C64XX_SPI_ENCLK_ENABLE;
551 writel(val, regs + S3C64XX_SPI_CLK_CFG);
552 }
553}
554
555#define XFER_DMAADDR_INVALID DMA_BIT_MASK(32)
556
557static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd,
558 struct spi_message *msg)
559{
560 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
561 struct device *dev = &sdd->pdev->dev;
562 struct spi_transfer *xfer;
563
564 if (msg->is_dma_mapped)
565 return 0;
566
567 /* First mark all xfer unmapped */
568 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
569 xfer->rx_dma = XFER_DMAADDR_INVALID;
570 xfer->tx_dma = XFER_DMAADDR_INVALID;
571 }
572
573 /* Map until end or first fail */
574 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
575
576 if (xfer->len <= ((sci->fifo_lvl_mask >> 1) + 1))
577 continue;
578
579 if (xfer->tx_buf != NULL) {
580 xfer->tx_dma = dma_map_single(dev,
581 (void *)xfer->tx_buf, xfer->len,
582 DMA_TO_DEVICE);
583 if (dma_mapping_error(dev, xfer->tx_dma)) {
584 dev_err(dev, "dma_map_single Tx failed\n");
585 xfer->tx_dma = XFER_DMAADDR_INVALID;
586 return -ENOMEM;
587 }
588 }
589
590 if (xfer->rx_buf != NULL) {
591 xfer->rx_dma = dma_map_single(dev, xfer->rx_buf,
592 xfer->len, DMA_FROM_DEVICE);
593 if (dma_mapping_error(dev, xfer->rx_dma)) {
594 dev_err(dev, "dma_map_single Rx failed\n");
595 dma_unmap_single(dev, xfer->tx_dma,
596 xfer->len, DMA_TO_DEVICE);
597 xfer->tx_dma = XFER_DMAADDR_INVALID;
598 xfer->rx_dma = XFER_DMAADDR_INVALID;
599 return -ENOMEM;
600 }
601 }
602 }
603
604 return 0;
605}
606
607static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd,
608 struct spi_message *msg)
609{
610 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
611 struct device *dev = &sdd->pdev->dev;
612 struct spi_transfer *xfer;
613
614 if (msg->is_dma_mapped)
615 return;
616
617 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
618
619 if (xfer->len <= ((sci->fifo_lvl_mask >> 1) + 1))
620 continue;
621
622 if (xfer->rx_buf != NULL
623 && xfer->rx_dma != XFER_DMAADDR_INVALID)
624 dma_unmap_single(dev, xfer->rx_dma,
625 xfer->len, DMA_FROM_DEVICE);
626
627 if (xfer->tx_buf != NULL
628 && xfer->tx_dma != XFER_DMAADDR_INVALID)
629 dma_unmap_single(dev, xfer->tx_dma,
630 xfer->len, DMA_TO_DEVICE);
631 }
632}
633
634static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
635 struct spi_message *msg)
636{
637 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
638 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
639 struct spi_device *spi = msg->spi;
640 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
641 struct spi_transfer *xfer;
642 int status = 0, cs_toggle = 0;
643 u32 speed;
644 u8 bpw;
645
646 /* If Master's(controller) state differs from that needed by Slave */
647 if (sdd->cur_speed != spi->max_speed_hz
648 || sdd->cur_mode != spi->mode
649 || sdd->cur_bpw != spi->bits_per_word) {
650 sdd->cur_bpw = spi->bits_per_word;
651 sdd->cur_speed = spi->max_speed_hz;
652 sdd->cur_mode = spi->mode;
653 s3c64xx_spi_config(sdd);
654 }
655
656 /* Map all the transfers if needed */
657 if (s3c64xx_spi_map_mssg(sdd, msg)) {
658 dev_err(&spi->dev,
659 "Xfer: Unable to map message buffers!\n");
660 status = -ENOMEM;
661 goto out;
662 }
663
664 /* Configure feedback delay */
665 writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK);
666
667 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
668
669 unsigned long flags;
670 int use_dma;
671
672 INIT_COMPLETION(sdd->xfer_completion);
673
674 /* Only BPW and Speed may change across transfers */
675 bpw = xfer->bits_per_word ? : spi->bits_per_word;
676 speed = xfer->speed_hz ? : spi->max_speed_hz;
677
678 if (xfer->len % (bpw / 8)) {
679 dev_err(&spi->dev,
680 "Xfer length(%u) not a multiple of word size(%u)\n",
681 xfer->len, bpw / 8);
682 status = -EIO;
683 goto out;
684 }
685
686 if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) {
687 sdd->cur_bpw = bpw;
688 sdd->cur_speed = speed;
689 s3c64xx_spi_config(sdd);
690 }
691
692 /* Polling method for xfers not bigger than FIFO capacity */
693 if (xfer->len <= ((sci->fifo_lvl_mask >> 1) + 1))
694 use_dma = 0;
695 else
696 use_dma = 1;
697
698 spin_lock_irqsave(&sdd->lock, flags);
699
700 /* Pending only which is to be done */
701 sdd->state &= ~RXBUSY;
702 sdd->state &= ~TXBUSY;
703
704 enable_datapath(sdd, spi, xfer, use_dma);
705
706 /* Slave Select */
707 enable_cs(sdd, spi);
708
709 /* Start the signals */
710 S3C64XX_SPI_ACT(sdd);
711
712 spin_unlock_irqrestore(&sdd->lock, flags);
713
714 status = wait_for_xfer(sdd, xfer, use_dma);
715
716 /* Quiese the signals */
717 S3C64XX_SPI_DEACT(sdd);
718
719 if (status) {
720 dev_err(&spi->dev, "I/O Error: "
721 "rx-%d tx-%d res:rx-%c tx-%c len-%d\n",
722 xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
723 (sdd->state & RXBUSY) ? 'f' : 'p',
724 (sdd->state & TXBUSY) ? 'f' : 'p',
725 xfer->len);
726
727 if (use_dma) {
728 if (xfer->tx_buf != NULL
729 && (sdd->state & TXBUSY))
730 sdd->ops->stop(sdd->tx_dma.ch);
731 if (xfer->rx_buf != NULL
732 && (sdd->state & RXBUSY))
733 sdd->ops->stop(sdd->rx_dma.ch);
734 }
735
736 goto out;
737 }
738
739 if (xfer->delay_usecs)
740 udelay(xfer->delay_usecs);
741
742 if (xfer->cs_change) {
743 /* Hint that the next mssg is gonna be
744 for the same device */
745 if (list_is_last(&xfer->transfer_list,
746 &msg->transfers))
747 cs_toggle = 1;
748 else
749 disable_cs(sdd, spi);
750 }
751
752 msg->actual_length += xfer->len;
753
754 flush_fifo(sdd);
755 }
756
757out:
758 if (!cs_toggle || status)
759 disable_cs(sdd, spi);
760 else
761 sdd->tgl_spi = spi;
762
763 s3c64xx_spi_unmap_mssg(sdd, msg);
764
765 msg->status = status;
766
767 spi_finalize_current_message(master);
768
769 return 0;
770}
771
772static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
773{
774 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
775
776 /* Acquire DMA channels */
777 while (!acquire_dma(sdd))
778 msleep(10);
779
780 pm_runtime_get_sync(&sdd->pdev->dev);
781
782 return 0;
783}
784
785static int s3c64xx_spi_unprepare_transfer(struct spi_master *spi)
786{
787 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
788
789 /* Free DMA channels */
790 sdd->ops->release(sdd->rx_dma.ch, &s3c64xx_spi_dma_client);
791 sdd->ops->release(sdd->tx_dma.ch, &s3c64xx_spi_dma_client);
792
793 pm_runtime_put(&sdd->pdev->dev);
794
795 return 0;
796}
797
798/*
799 * Here we only check the validity of requested configuration
800 * and save the configuration in a local data-structure.
801 * The controller is actually configured only just before we
802 * get a message to transfer.
803 */
804static int s3c64xx_spi_setup(struct spi_device *spi)
805{
806 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
807 struct s3c64xx_spi_driver_data *sdd;
808 struct s3c64xx_spi_info *sci;
809 struct spi_message *msg;
810 unsigned long flags;
811 int err = 0;
812
813 if (cs == NULL || cs->set_level == NULL) {
814 dev_err(&spi->dev, "No CS for SPI(%d)\n", spi->chip_select);
815 return -ENODEV;
816 }
817
818 sdd = spi_master_get_devdata(spi->master);
819 sci = sdd->cntrlr_info;
820
821 spin_lock_irqsave(&sdd->lock, flags);
822
823 list_for_each_entry(msg, &sdd->queue, queue) {
824 /* Is some mssg is already queued for this device */
825 if (msg->spi == spi) {
826 dev_err(&spi->dev,
827 "setup: attempt while mssg in queue!\n");
828 spin_unlock_irqrestore(&sdd->lock, flags);
829 return -EBUSY;
830 }
831 }
832
833 spin_unlock_irqrestore(&sdd->lock, flags);
834
835 if (spi->bits_per_word != 8
836 && spi->bits_per_word != 16
837 && spi->bits_per_word != 32) {
838 dev_err(&spi->dev, "setup: %dbits/wrd not supported!\n",
839 spi->bits_per_word);
840 err = -EINVAL;
841 goto setup_exit;
842 }
843
844 pm_runtime_get_sync(&sdd->pdev->dev);
845
846 /* Check if we can provide the requested rate */
847 if (!sci->clk_from_cmu) {
848 u32 psr, speed;
849
850 /* Max possible */
851 speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1);
852
853 if (spi->max_speed_hz > speed)
854 spi->max_speed_hz = speed;
855
856 psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1;
857 psr &= S3C64XX_SPI_PSR_MASK;
858 if (psr == S3C64XX_SPI_PSR_MASK)
859 psr--;
860
861 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
862 if (spi->max_speed_hz < speed) {
863 if (psr+1 < S3C64XX_SPI_PSR_MASK) {
864 psr++;
865 } else {
866 err = -EINVAL;
867 goto setup_exit;
868 }
869 }
870
871 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
872 if (spi->max_speed_hz >= speed)
873 spi->max_speed_hz = speed;
874 else
875 err = -EINVAL;
876 }
877
878 pm_runtime_put(&sdd->pdev->dev);
879
880setup_exit:
881
882 /* setup() returns with device de-selected */
883 disable_cs(sdd, spi);
884
885 return err;
886}
887
888static irqreturn_t s3c64xx_spi_irq(int irq, void *data)
889{
890 struct s3c64xx_spi_driver_data *sdd = data;
891 struct spi_master *spi = sdd->master;
892 unsigned int val;
893
894 val = readl(sdd->regs + S3C64XX_SPI_PENDING_CLR);
895
896 val &= S3C64XX_SPI_PND_RX_OVERRUN_CLR |
897 S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
898 S3C64XX_SPI_PND_TX_OVERRUN_CLR |
899 S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
900
901 writel(val, sdd->regs + S3C64XX_SPI_PENDING_CLR);
902
903 if (val & S3C64XX_SPI_PND_RX_OVERRUN_CLR)
904 dev_err(&spi->dev, "RX overrun\n");
905 if (val & S3C64XX_SPI_PND_RX_UNDERRUN_CLR)
906 dev_err(&spi->dev, "RX underrun\n");
907 if (val & S3C64XX_SPI_PND_TX_OVERRUN_CLR)
908 dev_err(&spi->dev, "TX overrun\n");
909 if (val & S3C64XX_SPI_PND_TX_UNDERRUN_CLR)
910 dev_err(&spi->dev, "TX underrun\n");
911
912 return IRQ_HANDLED;
913}
914
915static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel)
916{
917 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
918 void __iomem *regs = sdd->regs;
919 unsigned int val;
920
921 sdd->cur_speed = 0;
922
923 S3C64XX_SPI_DEACT(sdd);
924
925 /* Disable Interrupts - we use Polling if not DMA mode */
926 writel(0, regs + S3C64XX_SPI_INT_EN);
927
928 if (!sci->clk_from_cmu)
929 writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT,
930 regs + S3C64XX_SPI_CLK_CFG);
931 writel(0, regs + S3C64XX_SPI_MODE_CFG);
932 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
933
934 /* Clear any irq pending bits */
935 writel(readl(regs + S3C64XX_SPI_PENDING_CLR),
936 regs + S3C64XX_SPI_PENDING_CLR);
937
938 writel(0, regs + S3C64XX_SPI_SWAP_CFG);
939
940 val = readl(regs + S3C64XX_SPI_MODE_CFG);
941 val &= ~S3C64XX_SPI_MODE_4BURST;
942 val &= ~(S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
943 val |= (S3C64XX_SPI_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
944 writel(val, regs + S3C64XX_SPI_MODE_CFG);
945
946 flush_fifo(sdd);
947}
948
949static int __init s3c64xx_spi_probe(struct platform_device *pdev)
950{
951 struct resource *mem_res, *dmatx_res, *dmarx_res;
952 struct s3c64xx_spi_driver_data *sdd;
953 struct s3c64xx_spi_info *sci;
954 struct spi_master *master;
955 int ret, irq;
956 char clk_name[16];
957
958 if (pdev->id < 0) {
959 dev_err(&pdev->dev,
960 "Invalid platform device id-%d\n", pdev->id);
961 return -ENODEV;
962 }
963
964 if (pdev->dev.platform_data == NULL) {
965 dev_err(&pdev->dev, "platform_data missing!\n");
966 return -ENODEV;
967 }
968
969 sci = pdev->dev.platform_data;
970
971 /* Check for availability of necessary resource */
972
973 dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
974 if (dmatx_res == NULL) {
975 dev_err(&pdev->dev, "Unable to get SPI-Tx dma resource\n");
976 return -ENXIO;
977 }
978
979 dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
980 if (dmarx_res == NULL) {
981 dev_err(&pdev->dev, "Unable to get SPI-Rx dma resource\n");
982 return -ENXIO;
983 }
984
985 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
986 if (mem_res == NULL) {
987 dev_err(&pdev->dev, "Unable to get SPI MEM resource\n");
988 return -ENXIO;
989 }
990
991 irq = platform_get_irq(pdev, 0);
992 if (irq < 0) {
993 dev_warn(&pdev->dev, "Failed to get IRQ: %d\n", irq);
994 return irq;
995 }
996
997 master = spi_alloc_master(&pdev->dev,
998 sizeof(struct s3c64xx_spi_driver_data));
999 if (master == NULL) {
1000 dev_err(&pdev->dev, "Unable to allocate SPI Master\n");
1001 return -ENOMEM;
1002 }
1003
1004 platform_set_drvdata(pdev, master);
1005
1006 sdd = spi_master_get_devdata(master);
1007 sdd->master = master;
1008 sdd->cntrlr_info = sci;
1009 sdd->pdev = pdev;
1010 sdd->sfr_start = mem_res->start;
1011 sdd->tx_dma.dmach = dmatx_res->start;
1012 sdd->tx_dma.direction = DMA_MEM_TO_DEV;
1013 sdd->rx_dma.dmach = dmarx_res->start;
1014 sdd->rx_dma.direction = DMA_DEV_TO_MEM;
1015
1016 sdd->cur_bpw = 8;
1017
1018 master->bus_num = pdev->id;
1019 master->setup = s3c64xx_spi_setup;
1020 master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer;
1021 master->transfer_one_message = s3c64xx_spi_transfer_one_message;
1022 master->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer;
1023 master->num_chipselect = sci->num_cs;
1024 master->dma_alignment = 8;
1025 /* the spi->mode bits understood by this driver: */
1026 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1027
1028 if (request_mem_region(mem_res->start,
1029 resource_size(mem_res), pdev->name) == NULL) {
1030 dev_err(&pdev->dev, "Req mem region failed\n");
1031 ret = -ENXIO;
1032 goto err0;
1033 }
1034
1035 sdd->regs = ioremap(mem_res->start, resource_size(mem_res));
1036 if (sdd->regs == NULL) {
1037 dev_err(&pdev->dev, "Unable to remap IO\n");
1038 ret = -ENXIO;
1039 goto err1;
1040 }
1041
1042 if (sci->cfg_gpio == NULL || sci->cfg_gpio(pdev)) {
1043 dev_err(&pdev->dev, "Unable to config gpio\n");
1044 ret = -EBUSY;
1045 goto err2;
1046 }
1047
1048 /* Setup clocks */
1049 sdd->clk = clk_get(&pdev->dev, "spi");
1050 if (IS_ERR(sdd->clk)) {
1051 dev_err(&pdev->dev, "Unable to acquire clock 'spi'\n");
1052 ret = PTR_ERR(sdd->clk);
1053 goto err3;
1054 }
1055
1056 if (clk_enable(sdd->clk)) {
1057 dev_err(&pdev->dev, "Couldn't enable clock 'spi'\n");
1058 ret = -EBUSY;
1059 goto err4;
1060 }
1061
1062 sprintf(clk_name, "spi_busclk%d", sci->src_clk_nr);
1063 sdd->src_clk = clk_get(&pdev->dev, clk_name);
1064 if (IS_ERR(sdd->src_clk)) {
1065 dev_err(&pdev->dev,
1066 "Unable to acquire clock '%s'\n", clk_name);
1067 ret = PTR_ERR(sdd->src_clk);
1068 goto err5;
1069 }
1070
1071 if (clk_enable(sdd->src_clk)) {
1072 dev_err(&pdev->dev, "Couldn't enable clock '%s'\n", clk_name);
1073 ret = -EBUSY;
1074 goto err6;
1075 }
1076
1077 /* Setup Deufult Mode */
1078 s3c64xx_spi_hwinit(sdd, pdev->id);
1079
1080 spin_lock_init(&sdd->lock);
1081 init_completion(&sdd->xfer_completion);
1082 INIT_LIST_HEAD(&sdd->queue);
1083
1084 ret = request_irq(irq, s3c64xx_spi_irq, 0, "spi-s3c64xx", sdd);
1085 if (ret != 0) {
1086 dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n",
1087 irq, ret);
1088 goto err7;
1089 }
1090
1091 writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN |
1092 S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
1093 sdd->regs + S3C64XX_SPI_INT_EN);
1094
1095 if (spi_register_master(master)) {
1096 dev_err(&pdev->dev, "cannot register SPI master\n");
1097 ret = -EBUSY;
1098 goto err8;
1099 }
1100
1101 dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d "
1102 "with %d Slaves attached\n",
1103 pdev->id, master->num_chipselect);
1104 dev_dbg(&pdev->dev, "\tIOmem=[0x%x-0x%x]\tDMA=[Rx-%d, Tx-%d]\n",
1105 mem_res->end, mem_res->start,
1106 sdd->rx_dma.dmach, sdd->tx_dma.dmach);
1107
1108 pm_runtime_enable(&pdev->dev);
1109
1110 return 0;
1111
1112err8:
1113 free_irq(irq, sdd);
1114err7:
1115 clk_disable(sdd->src_clk);
1116err6:
1117 clk_put(sdd->src_clk);
1118err5:
1119 clk_disable(sdd->clk);
1120err4:
1121 clk_put(sdd->clk);
1122err3:
1123err2:
1124 iounmap((void *) sdd->regs);
1125err1:
1126 release_mem_region(mem_res->start, resource_size(mem_res));
1127err0:
1128 platform_set_drvdata(pdev, NULL);
1129 spi_master_put(master);
1130
1131 return ret;
1132}
1133
1134static int s3c64xx_spi_remove(struct platform_device *pdev)
1135{
1136 struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
1137 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1138 struct resource *mem_res;
1139
1140 pm_runtime_disable(&pdev->dev);
1141
1142 spi_unregister_master(master);
1143
1144 writel(0, sdd->regs + S3C64XX_SPI_INT_EN);
1145
1146 free_irq(platform_get_irq(pdev, 0), sdd);
1147
1148 clk_disable(sdd->src_clk);
1149 clk_put(sdd->src_clk);
1150
1151 clk_disable(sdd->clk);
1152 clk_put(sdd->clk);
1153
1154 iounmap((void *) sdd->regs);
1155
1156 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1157 if (mem_res != NULL)
1158 release_mem_region(mem_res->start, resource_size(mem_res));
1159
1160 platform_set_drvdata(pdev, NULL);
1161 spi_master_put(master);
1162
1163 return 0;
1164}
1165
1166#ifdef CONFIG_PM
1167static int s3c64xx_spi_suspend(struct device *dev)
1168{
1169 struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
1170 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1171
1172 spi_master_suspend(master);
1173
1174 /* Disable the clock */
1175 clk_disable(sdd->src_clk);
1176 clk_disable(sdd->clk);
1177
1178 sdd->cur_speed = 0; /* Output Clock is stopped */
1179
1180 return 0;
1181}
1182
1183static int s3c64xx_spi_resume(struct device *dev)
1184{
1185 struct platform_device *pdev = to_platform_device(dev);
1186 struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
1187 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1188 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
1189
1190 sci->cfg_gpio(pdev);
1191
1192 /* Enable the clock */
1193 clk_enable(sdd->src_clk);
1194 clk_enable(sdd->clk);
1195
1196 s3c64xx_spi_hwinit(sdd, pdev->id);
1197
1198 spi_master_resume(master);
1199
1200 return 0;
1201}
1202#endif /* CONFIG_PM */
1203
1204#ifdef CONFIG_PM_RUNTIME
1205static int s3c64xx_spi_runtime_suspend(struct device *dev)
1206{
1207 struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
1208 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1209
1210 clk_disable(sdd->clk);
1211 clk_disable(sdd->src_clk);
1212
1213 return 0;
1214}
1215
1216static int s3c64xx_spi_runtime_resume(struct device *dev)
1217{
1218 struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
1219 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1220
1221 clk_enable(sdd->src_clk);
1222 clk_enable(sdd->clk);
1223
1224 return 0;
1225}
1226#endif /* CONFIG_PM_RUNTIME */
1227
1228static const struct dev_pm_ops s3c64xx_spi_pm = {
1229 SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume)
1230 SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend,
1231 s3c64xx_spi_runtime_resume, NULL)
1232};
1233
1234static struct platform_driver s3c64xx_spi_driver = {
1235 .driver = {
1236 .name = "s3c64xx-spi",
1237 .owner = THIS_MODULE,
1238 .pm = &s3c64xx_spi_pm,
1239 },
1240 .remove = s3c64xx_spi_remove,
1241};
1242MODULE_ALIAS("platform:s3c64xx-spi");
1243
1244static int __init s3c64xx_spi_init(void)
1245{
1246 return platform_driver_probe(&s3c64xx_spi_driver, s3c64xx_spi_probe);
1247}
1248subsys_initcall(s3c64xx_spi_init);
1249
1250static void __exit s3c64xx_spi_exit(void)
1251{
1252 platform_driver_unregister(&s3c64xx_spi_driver);
1253}
1254module_exit(s3c64xx_spi_exit);
1255
1256MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
1257MODULE_DESCRIPTION("S3C64XX SPI Controller Driver");
1258MODULE_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/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/gpio.h>
17#include <linux/of.h>
18#include <linux/of_gpio.h>
19
20#include <linux/platform_data/spi-s3c64xx.h>
21
22#define MAX_SPI_PORTS 6
23#define S3C64XX_SPI_QUIRK_POLL (1 << 0)
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_SLAVE_SEL 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_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_SLAVE_AUTO (1<<1)
68#define S3C64XX_SPI_SLAVE_SIG_INACT (1<<0)
69#define S3C64XX_SPI_SLAVE_NSC_CNT_2 (2<<4)
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
88#define S3C64XX_SPI_PND_TX_UNDERRUN_CLR (1<<4)
89#define S3C64XX_SPI_PND_TX_OVERRUN_CLR (1<<3)
90#define S3C64XX_SPI_PND_RX_UNDERRUN_CLR (1<<2)
91#define S3C64XX_SPI_PND_RX_OVERRUN_CLR (1<<1)
92#define S3C64XX_SPI_PND_TRAILING_CLR (1<<0)
93
94#define S3C64XX_SPI_SWAP_RX_HALF_WORD (1<<7)
95#define S3C64XX_SPI_SWAP_RX_BYTE (1<<6)
96#define S3C64XX_SPI_SWAP_RX_BIT (1<<5)
97#define S3C64XX_SPI_SWAP_RX_EN (1<<4)
98#define S3C64XX_SPI_SWAP_TX_HALF_WORD (1<<3)
99#define S3C64XX_SPI_SWAP_TX_BYTE (1<<2)
100#define S3C64XX_SPI_SWAP_TX_BIT (1<<1)
101#define S3C64XX_SPI_SWAP_TX_EN (1<<0)
102
103#define S3C64XX_SPI_FBCLK_MSK (3<<0)
104
105#define FIFO_LVL_MASK(i) ((i)->port_conf->fifo_lvl_mask[i->port_id])
106#define S3C64XX_SPI_ST_TX_DONE(v, i) (((v) & \
107 (1 << (i)->port_conf->tx_st_done)) ? 1 : 0)
108#define TX_FIFO_LVL(v, i) (((v) >> 6) & FIFO_LVL_MASK(i))
109#define RX_FIFO_LVL(v, i) (((v) >> (i)->port_conf->rx_lvl_offset) & \
110 FIFO_LVL_MASK(i))
111
112#define S3C64XX_SPI_MAX_TRAILCNT 0x3ff
113#define S3C64XX_SPI_TRAILCNT_OFF 19
114
115#define S3C64XX_SPI_TRAILCNT S3C64XX_SPI_MAX_TRAILCNT
116
117#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
118#define is_polling(x) (x->port_conf->quirks & S3C64XX_SPI_QUIRK_POLL)
119
120#define RXBUSY (1<<2)
121#define TXBUSY (1<<3)
122
123struct s3c64xx_spi_dma_data {
124 struct dma_chan *ch;
125 enum dma_transfer_direction direction;
126};
127
128/**
129 * struct s3c64xx_spi_info - SPI Controller hardware info
130 * @fifo_lvl_mask: Bit-mask for {TX|RX}_FIFO_LVL bits in SPI_STATUS register.
131 * @rx_lvl_offset: Bit offset of RX_FIFO_LVL bits in SPI_STATUS regiter.
132 * @tx_st_done: Bit offset of TX_DONE bit in SPI_STATUS regiter.
133 * @quirks: Bitmask of known quirks
134 * @high_speed: True, if the controller supports HIGH_SPEED_EN bit.
135 * @clk_from_cmu: True, if the controller does not include a clock mux and
136 * prescaler unit.
137 * @clk_ioclk: True if clock is present on this device
138 *
139 * The Samsung s3c64xx SPI controller are used on various Samsung SoC's but
140 * differ in some aspects such as the size of the fifo and spi bus clock
141 * setup. Such differences are specified to the driver using this structure
142 * which is provided as driver data to the driver.
143 */
144struct s3c64xx_spi_port_config {
145 int fifo_lvl_mask[MAX_SPI_PORTS];
146 int rx_lvl_offset;
147 int tx_st_done;
148 int quirks;
149 bool high_speed;
150 bool clk_from_cmu;
151 bool clk_ioclk;
152};
153
154/**
155 * struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver.
156 * @clk: Pointer to the spi clock.
157 * @src_clk: Pointer to the clock used to generate SPI signals.
158 * @ioclk: Pointer to the i/o clock between master and slave
159 * @pdev: Pointer to device's platform device data
160 * @master: Pointer to the SPI Protocol master.
161 * @cntrlr_info: Platform specific data for the controller this driver manages.
162 * @lock: Controller specific lock.
163 * @state: Set of FLAGS to indicate status.
164 * @rx_dmach: Controller's DMA channel for Rx.
165 * @tx_dmach: Controller's DMA channel for Tx.
166 * @sfr_start: BUS address of SPI controller regs.
167 * @regs: Pointer to ioremap'ed controller registers.
168 * @irq: interrupt
169 * @xfer_completion: To indicate completion of xfer task.
170 * @cur_mode: Stores the active configuration of the controller.
171 * @cur_bpw: Stores the active bits per word settings.
172 * @cur_speed: Current clock speed
173 * @rx_dma: Local receive DMA data (e.g. chan and direction)
174 * @tx_dma: Local transmit DMA data (e.g. chan and direction)
175 * @port_conf: Local SPI port configuartion data
176 * @port_id: Port identification number
177 */
178struct s3c64xx_spi_driver_data {
179 void __iomem *regs;
180 struct clk *clk;
181 struct clk *src_clk;
182 struct clk *ioclk;
183 struct platform_device *pdev;
184 struct spi_master *master;
185 struct s3c64xx_spi_info *cntrlr_info;
186 spinlock_t lock;
187 unsigned long sfr_start;
188 struct completion xfer_completion;
189 unsigned state;
190 unsigned cur_mode, cur_bpw;
191 unsigned cur_speed;
192 struct s3c64xx_spi_dma_data rx_dma;
193 struct s3c64xx_spi_dma_data tx_dma;
194 struct s3c64xx_spi_port_config *port_conf;
195 unsigned int port_id;
196};
197
198static void s3c64xx_flush_fifo(struct s3c64xx_spi_driver_data *sdd)
199{
200 void __iomem *regs = sdd->regs;
201 unsigned long loops;
202 u32 val;
203
204 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
205
206 val = readl(regs + S3C64XX_SPI_CH_CFG);
207 val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON);
208 writel(val, regs + S3C64XX_SPI_CH_CFG);
209
210 val = readl(regs + S3C64XX_SPI_CH_CFG);
211 val |= S3C64XX_SPI_CH_SW_RST;
212 val &= ~S3C64XX_SPI_CH_HS_EN;
213 writel(val, regs + S3C64XX_SPI_CH_CFG);
214
215 /* Flush TxFIFO*/
216 loops = msecs_to_loops(1);
217 do {
218 val = readl(regs + S3C64XX_SPI_STATUS);
219 } while (TX_FIFO_LVL(val, sdd) && loops--);
220
221 if (loops == 0)
222 dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n");
223
224 /* Flush RxFIFO*/
225 loops = msecs_to_loops(1);
226 do {
227 val = readl(regs + S3C64XX_SPI_STATUS);
228 if (RX_FIFO_LVL(val, sdd))
229 readl(regs + S3C64XX_SPI_RX_DATA);
230 else
231 break;
232 } while (loops--);
233
234 if (loops == 0)
235 dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n");
236
237 val = readl(regs + S3C64XX_SPI_CH_CFG);
238 val &= ~S3C64XX_SPI_CH_SW_RST;
239 writel(val, regs + S3C64XX_SPI_CH_CFG);
240
241 val = readl(regs + S3C64XX_SPI_MODE_CFG);
242 val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
243 writel(val, regs + S3C64XX_SPI_MODE_CFG);
244}
245
246static void s3c64xx_spi_dmacb(void *data)
247{
248 struct s3c64xx_spi_driver_data *sdd;
249 struct s3c64xx_spi_dma_data *dma = data;
250 unsigned long flags;
251
252 if (dma->direction == DMA_DEV_TO_MEM)
253 sdd = container_of(data,
254 struct s3c64xx_spi_driver_data, rx_dma);
255 else
256 sdd = container_of(data,
257 struct s3c64xx_spi_driver_data, tx_dma);
258
259 spin_lock_irqsave(&sdd->lock, flags);
260
261 if (dma->direction == DMA_DEV_TO_MEM) {
262 sdd->state &= ~RXBUSY;
263 if (!(sdd->state & TXBUSY))
264 complete(&sdd->xfer_completion);
265 } else {
266 sdd->state &= ~TXBUSY;
267 if (!(sdd->state & RXBUSY))
268 complete(&sdd->xfer_completion);
269 }
270
271 spin_unlock_irqrestore(&sdd->lock, flags);
272}
273
274static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
275 struct sg_table *sgt)
276{
277 struct s3c64xx_spi_driver_data *sdd;
278 struct dma_slave_config config;
279 struct dma_async_tx_descriptor *desc;
280
281 memset(&config, 0, sizeof(config));
282
283 if (dma->direction == DMA_DEV_TO_MEM) {
284 sdd = container_of((void *)dma,
285 struct s3c64xx_spi_driver_data, rx_dma);
286 config.direction = dma->direction;
287 config.src_addr = sdd->sfr_start + S3C64XX_SPI_RX_DATA;
288 config.src_addr_width = sdd->cur_bpw / 8;
289 config.src_maxburst = 1;
290 dmaengine_slave_config(dma->ch, &config);
291 } else {
292 sdd = container_of((void *)dma,
293 struct s3c64xx_spi_driver_data, tx_dma);
294 config.direction = dma->direction;
295 config.dst_addr = sdd->sfr_start + S3C64XX_SPI_TX_DATA;
296 config.dst_addr_width = sdd->cur_bpw / 8;
297 config.dst_maxburst = 1;
298 dmaengine_slave_config(dma->ch, &config);
299 }
300
301 desc = dmaengine_prep_slave_sg(dma->ch, sgt->sgl, sgt->nents,
302 dma->direction, DMA_PREP_INTERRUPT);
303
304 desc->callback = s3c64xx_spi_dmacb;
305 desc->callback_param = dma;
306
307 dmaengine_submit(desc);
308 dma_async_issue_pending(dma->ch);
309}
310
311static void s3c64xx_spi_set_cs(struct spi_device *spi, bool enable)
312{
313 struct s3c64xx_spi_driver_data *sdd =
314 spi_master_get_devdata(spi->master);
315
316 if (sdd->cntrlr_info->no_cs)
317 return;
318
319 if (enable) {
320 if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO)) {
321 writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
322 } else {
323 u32 ssel = readl(sdd->regs + S3C64XX_SPI_SLAVE_SEL);
324
325 ssel |= (S3C64XX_SPI_SLAVE_AUTO |
326 S3C64XX_SPI_SLAVE_NSC_CNT_2);
327 writel(ssel, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
328 }
329 } else {
330 if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
331 writel(S3C64XX_SPI_SLAVE_SIG_INACT,
332 sdd->regs + S3C64XX_SPI_SLAVE_SEL);
333 }
334}
335
336static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
337{
338 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
339
340 if (is_polling(sdd))
341 return 0;
342
343 spi->dma_rx = sdd->rx_dma.ch;
344 spi->dma_tx = sdd->tx_dma.ch;
345
346 return 0;
347}
348
349static bool s3c64xx_spi_can_dma(struct spi_master *master,
350 struct spi_device *spi,
351 struct spi_transfer *xfer)
352{
353 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
354
355 return xfer->len > (FIFO_LVL_MASK(sdd) >> 1) + 1;
356}
357
358static void s3c64xx_enable_datapath(struct s3c64xx_spi_driver_data *sdd,
359 struct spi_transfer *xfer, int dma_mode)
360{
361 void __iomem *regs = sdd->regs;
362 u32 modecfg, chcfg;
363
364 modecfg = readl(regs + S3C64XX_SPI_MODE_CFG);
365 modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
366
367 chcfg = readl(regs + S3C64XX_SPI_CH_CFG);
368 chcfg &= ~S3C64XX_SPI_CH_TXCH_ON;
369
370 if (dma_mode) {
371 chcfg &= ~S3C64XX_SPI_CH_RXCH_ON;
372 } else {
373 /* Always shift in data in FIFO, even if xfer is Tx only,
374 * this helps setting PCKT_CNT value for generating clocks
375 * as exactly needed.
376 */
377 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
378 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
379 | S3C64XX_SPI_PACKET_CNT_EN,
380 regs + S3C64XX_SPI_PACKET_CNT);
381 }
382
383 if (xfer->tx_buf != NULL) {
384 sdd->state |= TXBUSY;
385 chcfg |= S3C64XX_SPI_CH_TXCH_ON;
386 if (dma_mode) {
387 modecfg |= S3C64XX_SPI_MODE_TXDMA_ON;
388 prepare_dma(&sdd->tx_dma, &xfer->tx_sg);
389 } else {
390 switch (sdd->cur_bpw) {
391 case 32:
392 iowrite32_rep(regs + S3C64XX_SPI_TX_DATA,
393 xfer->tx_buf, xfer->len / 4);
394 break;
395 case 16:
396 iowrite16_rep(regs + S3C64XX_SPI_TX_DATA,
397 xfer->tx_buf, xfer->len / 2);
398 break;
399 default:
400 iowrite8_rep(regs + S3C64XX_SPI_TX_DATA,
401 xfer->tx_buf, xfer->len);
402 break;
403 }
404 }
405 }
406
407 if (xfer->rx_buf != NULL) {
408 sdd->state |= RXBUSY;
409
410 if (sdd->port_conf->high_speed && sdd->cur_speed >= 30000000UL
411 && !(sdd->cur_mode & SPI_CPHA))
412 chcfg |= S3C64XX_SPI_CH_HS_EN;
413
414 if (dma_mode) {
415 modecfg |= S3C64XX_SPI_MODE_RXDMA_ON;
416 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
417 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
418 | S3C64XX_SPI_PACKET_CNT_EN,
419 regs + S3C64XX_SPI_PACKET_CNT);
420 prepare_dma(&sdd->rx_dma, &xfer->rx_sg);
421 }
422 }
423
424 writel(modecfg, regs + S3C64XX_SPI_MODE_CFG);
425 writel(chcfg, regs + S3C64XX_SPI_CH_CFG);
426}
427
428static u32 s3c64xx_spi_wait_for_timeout(struct s3c64xx_spi_driver_data *sdd,
429 int timeout_ms)
430{
431 void __iomem *regs = sdd->regs;
432 unsigned long val = 1;
433 u32 status;
434
435 /* max fifo depth available */
436 u32 max_fifo = (FIFO_LVL_MASK(sdd) >> 1) + 1;
437
438 if (timeout_ms)
439 val = msecs_to_loops(timeout_ms);
440
441 do {
442 status = readl(regs + S3C64XX_SPI_STATUS);
443 } while (RX_FIFO_LVL(status, sdd) < max_fifo && --val);
444
445 /* return the actual received data length */
446 return RX_FIFO_LVL(status, sdd);
447}
448
449static int s3c64xx_wait_for_dma(struct s3c64xx_spi_driver_data *sdd,
450 struct spi_transfer *xfer)
451{
452 void __iomem *regs = sdd->regs;
453 unsigned long val;
454 u32 status;
455 int ms;
456
457 /* millisecs to xfer 'len' bytes @ 'cur_speed' */
458 ms = xfer->len * 8 * 1000 / sdd->cur_speed;
459 ms += 10; /* some tolerance */
460
461 val = msecs_to_jiffies(ms) + 10;
462 val = wait_for_completion_timeout(&sdd->xfer_completion, val);
463
464 /*
465 * If the previous xfer was completed within timeout, then
466 * proceed further else return -EIO.
467 * DmaTx returns after simply writing data in the FIFO,
468 * w/o waiting for real transmission on the bus to finish.
469 * DmaRx returns only after Dma read data from FIFO which
470 * needs bus transmission to finish, so we don't worry if
471 * Xfer involved Rx(with or without Tx).
472 */
473 if (val && !xfer->rx_buf) {
474 val = msecs_to_loops(10);
475 status = readl(regs + S3C64XX_SPI_STATUS);
476 while ((TX_FIFO_LVL(status, sdd)
477 || !S3C64XX_SPI_ST_TX_DONE(status, sdd))
478 && --val) {
479 cpu_relax();
480 status = readl(regs + S3C64XX_SPI_STATUS);
481 }
482
483 }
484
485 /* If timed out while checking rx/tx status return error */
486 if (!val)
487 return -EIO;
488
489 return 0;
490}
491
492static int s3c64xx_wait_for_pio(struct s3c64xx_spi_driver_data *sdd,
493 struct spi_transfer *xfer)
494{
495 void __iomem *regs = sdd->regs;
496 unsigned long val;
497 u32 status;
498 int loops;
499 u32 cpy_len;
500 u8 *buf;
501 int ms;
502
503 /* millisecs to xfer 'len' bytes @ 'cur_speed' */
504 ms = xfer->len * 8 * 1000 / sdd->cur_speed;
505 ms += 10; /* some tolerance */
506
507 val = msecs_to_loops(ms);
508 do {
509 status = readl(regs + S3C64XX_SPI_STATUS);
510 } while (RX_FIFO_LVL(status, sdd) < xfer->len && --val);
511
512 if (!val)
513 return -EIO;
514
515 /* If it was only Tx */
516 if (!xfer->rx_buf) {
517 sdd->state &= ~TXBUSY;
518 return 0;
519 }
520
521 /*
522 * If the receive length is bigger than the controller fifo
523 * size, calculate the loops and read the fifo as many times.
524 * loops = length / max fifo size (calculated by using the
525 * fifo mask).
526 * For any size less than the fifo size the below code is
527 * executed atleast once.
528 */
529 loops = xfer->len / ((FIFO_LVL_MASK(sdd) >> 1) + 1);
530 buf = xfer->rx_buf;
531 do {
532 /* wait for data to be received in the fifo */
533 cpy_len = s3c64xx_spi_wait_for_timeout(sdd,
534 (loops ? ms : 0));
535
536 switch (sdd->cur_bpw) {
537 case 32:
538 ioread32_rep(regs + S3C64XX_SPI_RX_DATA,
539 buf, cpy_len / 4);
540 break;
541 case 16:
542 ioread16_rep(regs + S3C64XX_SPI_RX_DATA,
543 buf, cpy_len / 2);
544 break;
545 default:
546 ioread8_rep(regs + S3C64XX_SPI_RX_DATA,
547 buf, cpy_len);
548 break;
549 }
550
551 buf = buf + cpy_len;
552 } while (loops--);
553 sdd->state &= ~RXBUSY;
554
555 return 0;
556}
557
558static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
559{
560 void __iomem *regs = sdd->regs;
561 u32 val;
562
563 /* Disable Clock */
564 if (!sdd->port_conf->clk_from_cmu) {
565 val = readl(regs + S3C64XX_SPI_CLK_CFG);
566 val &= ~S3C64XX_SPI_ENCLK_ENABLE;
567 writel(val, regs + S3C64XX_SPI_CLK_CFG);
568 }
569
570 /* Set Polarity and Phase */
571 val = readl(regs + S3C64XX_SPI_CH_CFG);
572 val &= ~(S3C64XX_SPI_CH_SLAVE |
573 S3C64XX_SPI_CPOL_L |
574 S3C64XX_SPI_CPHA_B);
575
576 if (sdd->cur_mode & SPI_CPOL)
577 val |= S3C64XX_SPI_CPOL_L;
578
579 if (sdd->cur_mode & SPI_CPHA)
580 val |= S3C64XX_SPI_CPHA_B;
581
582 writel(val, regs + S3C64XX_SPI_CH_CFG);
583
584 /* Set Channel & DMA Mode */
585 val = readl(regs + S3C64XX_SPI_MODE_CFG);
586 val &= ~(S3C64XX_SPI_MODE_BUS_TSZ_MASK
587 | S3C64XX_SPI_MODE_CH_TSZ_MASK);
588
589 switch (sdd->cur_bpw) {
590 case 32:
591 val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD;
592 val |= S3C64XX_SPI_MODE_CH_TSZ_WORD;
593 break;
594 case 16:
595 val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD;
596 val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD;
597 break;
598 default:
599 val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE;
600 val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE;
601 break;
602 }
603
604 writel(val, regs + S3C64XX_SPI_MODE_CFG);
605
606 if (sdd->port_conf->clk_from_cmu) {
607 /* The src_clk clock is divided internally by 2 */
608 clk_set_rate(sdd->src_clk, sdd->cur_speed * 2);
609 } else {
610 /* Configure Clock */
611 val = readl(regs + S3C64XX_SPI_CLK_CFG);
612 val &= ~S3C64XX_SPI_PSR_MASK;
613 val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1)
614 & S3C64XX_SPI_PSR_MASK);
615 writel(val, regs + S3C64XX_SPI_CLK_CFG);
616
617 /* Enable Clock */
618 val = readl(regs + S3C64XX_SPI_CLK_CFG);
619 val |= S3C64XX_SPI_ENCLK_ENABLE;
620 writel(val, regs + S3C64XX_SPI_CLK_CFG);
621 }
622}
623
624#define XFER_DMAADDR_INVALID DMA_BIT_MASK(32)
625
626static int s3c64xx_spi_prepare_message(struct spi_master *master,
627 struct spi_message *msg)
628{
629 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
630 struct spi_device *spi = msg->spi;
631 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
632
633 /* Configure feedback delay */
634 writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK);
635
636 return 0;
637}
638
639static int s3c64xx_spi_transfer_one(struct spi_master *master,
640 struct spi_device *spi,
641 struct spi_transfer *xfer)
642{
643 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
644 const unsigned int fifo_len = (FIFO_LVL_MASK(sdd) >> 1) + 1;
645 const void *tx_buf = NULL;
646 void *rx_buf = NULL;
647 int target_len = 0, origin_len = 0;
648 int use_dma = 0;
649 int status;
650 u32 speed;
651 u8 bpw;
652 unsigned long flags;
653
654 reinit_completion(&sdd->xfer_completion);
655
656 /* Only BPW and Speed may change across transfers */
657 bpw = xfer->bits_per_word;
658 speed = xfer->speed_hz;
659
660 if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) {
661 sdd->cur_bpw = bpw;
662 sdd->cur_speed = speed;
663 sdd->cur_mode = spi->mode;
664 s3c64xx_spi_config(sdd);
665 }
666
667 if (!is_polling(sdd) && (xfer->len > fifo_len) &&
668 sdd->rx_dma.ch && sdd->tx_dma.ch) {
669 use_dma = 1;
670
671 } else if (is_polling(sdd) && xfer->len > fifo_len) {
672 tx_buf = xfer->tx_buf;
673 rx_buf = xfer->rx_buf;
674 origin_len = xfer->len;
675
676 target_len = xfer->len;
677 if (xfer->len > fifo_len)
678 xfer->len = fifo_len;
679 }
680
681 do {
682 spin_lock_irqsave(&sdd->lock, flags);
683
684 /* Pending only which is to be done */
685 sdd->state &= ~RXBUSY;
686 sdd->state &= ~TXBUSY;
687
688 s3c64xx_enable_datapath(sdd, xfer, use_dma);
689
690 /* Start the signals */
691 s3c64xx_spi_set_cs(spi, true);
692
693 spin_unlock_irqrestore(&sdd->lock, flags);
694
695 if (use_dma)
696 status = s3c64xx_wait_for_dma(sdd, xfer);
697 else
698 status = s3c64xx_wait_for_pio(sdd, xfer);
699
700 if (status) {
701 dev_err(&spi->dev,
702 "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n",
703 xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
704 (sdd->state & RXBUSY) ? 'f' : 'p',
705 (sdd->state & TXBUSY) ? 'f' : 'p',
706 xfer->len);
707
708 if (use_dma) {
709 if (xfer->tx_buf && (sdd->state & TXBUSY))
710 dmaengine_terminate_all(sdd->tx_dma.ch);
711 if (xfer->rx_buf && (sdd->state & RXBUSY))
712 dmaengine_terminate_all(sdd->rx_dma.ch);
713 }
714 } else {
715 s3c64xx_flush_fifo(sdd);
716 }
717 if (target_len > 0) {
718 target_len -= xfer->len;
719
720 if (xfer->tx_buf)
721 xfer->tx_buf += xfer->len;
722
723 if (xfer->rx_buf)
724 xfer->rx_buf += xfer->len;
725
726 if (target_len > fifo_len)
727 xfer->len = fifo_len;
728 else
729 xfer->len = target_len;
730 }
731 } while (target_len > 0);
732
733 if (origin_len) {
734 /* Restore original xfer buffers and length */
735 xfer->tx_buf = tx_buf;
736 xfer->rx_buf = rx_buf;
737 xfer->len = origin_len;
738 }
739
740 return status;
741}
742
743static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
744 struct spi_device *spi)
745{
746 struct s3c64xx_spi_csinfo *cs;
747 struct device_node *slave_np, *data_np = NULL;
748 u32 fb_delay = 0;
749
750 slave_np = spi->dev.of_node;
751 if (!slave_np) {
752 dev_err(&spi->dev, "device node not found\n");
753 return ERR_PTR(-EINVAL);
754 }
755
756 data_np = of_get_child_by_name(slave_np, "controller-data");
757 if (!data_np) {
758 dev_err(&spi->dev, "child node 'controller-data' not found\n");
759 return ERR_PTR(-EINVAL);
760 }
761
762 cs = kzalloc(sizeof(*cs), GFP_KERNEL);
763 if (!cs) {
764 of_node_put(data_np);
765 return ERR_PTR(-ENOMEM);
766 }
767
768 of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay);
769 cs->fb_delay = fb_delay;
770 of_node_put(data_np);
771 return cs;
772}
773
774/*
775 * Here we only check the validity of requested configuration
776 * and save the configuration in a local data-structure.
777 * The controller is actually configured only just before we
778 * get a message to transfer.
779 */
780static int s3c64xx_spi_setup(struct spi_device *spi)
781{
782 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
783 struct s3c64xx_spi_driver_data *sdd;
784 int err;
785
786 sdd = spi_master_get_devdata(spi->master);
787 if (spi->dev.of_node) {
788 cs = s3c64xx_get_slave_ctrldata(spi);
789 spi->controller_data = cs;
790 } else if (cs) {
791 /* On non-DT platforms the SPI core will set spi->cs_gpio
792 * to -ENOENT. The GPIO pin used to drive the chip select
793 * is defined by using platform data so spi->cs_gpio value
794 * has to be override to have the proper GPIO pin number.
795 */
796 spi->cs_gpio = cs->line;
797 }
798
799 if (IS_ERR_OR_NULL(cs)) {
800 dev_err(&spi->dev, "No CS for SPI(%d)\n", spi->chip_select);
801 return -ENODEV;
802 }
803
804 if (!spi_get_ctldata(spi)) {
805 if (gpio_is_valid(spi->cs_gpio)) {
806 err = gpio_request_one(spi->cs_gpio, GPIOF_OUT_INIT_HIGH,
807 dev_name(&spi->dev));
808 if (err) {
809 dev_err(&spi->dev,
810 "Failed to get /CS gpio [%d]: %d\n",
811 spi->cs_gpio, err);
812 goto err_gpio_req;
813 }
814 }
815
816 spi_set_ctldata(spi, cs);
817 }
818
819 pm_runtime_get_sync(&sdd->pdev->dev);
820
821 /* Check if we can provide the requested rate */
822 if (!sdd->port_conf->clk_from_cmu) {
823 u32 psr, speed;
824
825 /* Max possible */
826 speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1);
827
828 if (spi->max_speed_hz > speed)
829 spi->max_speed_hz = speed;
830
831 psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1;
832 psr &= S3C64XX_SPI_PSR_MASK;
833 if (psr == S3C64XX_SPI_PSR_MASK)
834 psr--;
835
836 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
837 if (spi->max_speed_hz < speed) {
838 if (psr+1 < S3C64XX_SPI_PSR_MASK) {
839 psr++;
840 } else {
841 err = -EINVAL;
842 goto setup_exit;
843 }
844 }
845
846 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
847 if (spi->max_speed_hz >= speed) {
848 spi->max_speed_hz = speed;
849 } else {
850 dev_err(&spi->dev, "Can't set %dHz transfer speed\n",
851 spi->max_speed_hz);
852 err = -EINVAL;
853 goto setup_exit;
854 }
855 }
856
857 pm_runtime_mark_last_busy(&sdd->pdev->dev);
858 pm_runtime_put_autosuspend(&sdd->pdev->dev);
859 s3c64xx_spi_set_cs(spi, false);
860
861 return 0;
862
863setup_exit:
864 pm_runtime_mark_last_busy(&sdd->pdev->dev);
865 pm_runtime_put_autosuspend(&sdd->pdev->dev);
866 /* setup() returns with device de-selected */
867 s3c64xx_spi_set_cs(spi, false);
868
869 if (gpio_is_valid(spi->cs_gpio))
870 gpio_free(spi->cs_gpio);
871 spi_set_ctldata(spi, NULL);
872
873err_gpio_req:
874 if (spi->dev.of_node)
875 kfree(cs);
876
877 return err;
878}
879
880static void s3c64xx_spi_cleanup(struct spi_device *spi)
881{
882 struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi);
883
884 if (gpio_is_valid(spi->cs_gpio)) {
885 gpio_free(spi->cs_gpio);
886 if (spi->dev.of_node)
887 kfree(cs);
888 else {
889 /* On non-DT platforms, the SPI core sets
890 * spi->cs_gpio to -ENOENT and .setup()
891 * overrides it with the GPIO pin value
892 * passed using platform data.
893 */
894 spi->cs_gpio = -ENOENT;
895 }
896 }
897
898 spi_set_ctldata(spi, NULL);
899}
900
901static irqreturn_t s3c64xx_spi_irq(int irq, void *data)
902{
903 struct s3c64xx_spi_driver_data *sdd = data;
904 struct spi_master *spi = sdd->master;
905 unsigned int val, clr = 0;
906
907 val = readl(sdd->regs + S3C64XX_SPI_STATUS);
908
909 if (val & S3C64XX_SPI_ST_RX_OVERRUN_ERR) {
910 clr = S3C64XX_SPI_PND_RX_OVERRUN_CLR;
911 dev_err(&spi->dev, "RX overrun\n");
912 }
913 if (val & S3C64XX_SPI_ST_RX_UNDERRUN_ERR) {
914 clr |= S3C64XX_SPI_PND_RX_UNDERRUN_CLR;
915 dev_err(&spi->dev, "RX underrun\n");
916 }
917 if (val & S3C64XX_SPI_ST_TX_OVERRUN_ERR) {
918 clr |= S3C64XX_SPI_PND_TX_OVERRUN_CLR;
919 dev_err(&spi->dev, "TX overrun\n");
920 }
921 if (val & S3C64XX_SPI_ST_TX_UNDERRUN_ERR) {
922 clr |= S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
923 dev_err(&spi->dev, "TX underrun\n");
924 }
925
926 /* Clear the pending irq by setting and then clearing it */
927 writel(clr, sdd->regs + S3C64XX_SPI_PENDING_CLR);
928 writel(0, sdd->regs + S3C64XX_SPI_PENDING_CLR);
929
930 return IRQ_HANDLED;
931}
932
933static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd)
934{
935 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
936 void __iomem *regs = sdd->regs;
937 unsigned int val;
938
939 sdd->cur_speed = 0;
940
941 if (sci->no_cs)
942 writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
943 else if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
944 writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
945
946 /* Disable Interrupts - we use Polling if not DMA mode */
947 writel(0, regs + S3C64XX_SPI_INT_EN);
948
949 if (!sdd->port_conf->clk_from_cmu)
950 writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT,
951 regs + S3C64XX_SPI_CLK_CFG);
952 writel(0, regs + S3C64XX_SPI_MODE_CFG);
953 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
954
955 /* Clear any irq pending bits, should set and clear the bits */
956 val = S3C64XX_SPI_PND_RX_OVERRUN_CLR |
957 S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
958 S3C64XX_SPI_PND_TX_OVERRUN_CLR |
959 S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
960 writel(val, regs + S3C64XX_SPI_PENDING_CLR);
961 writel(0, regs + S3C64XX_SPI_PENDING_CLR);
962
963 writel(0, regs + S3C64XX_SPI_SWAP_CFG);
964
965 val = readl(regs + S3C64XX_SPI_MODE_CFG);
966 val &= ~S3C64XX_SPI_MODE_4BURST;
967 val &= ~(S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
968 val |= (S3C64XX_SPI_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
969 writel(val, regs + S3C64XX_SPI_MODE_CFG);
970
971 s3c64xx_flush_fifo(sdd);
972}
973
974#ifdef CONFIG_OF
975static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev)
976{
977 struct s3c64xx_spi_info *sci;
978 u32 temp;
979
980 sci = devm_kzalloc(dev, sizeof(*sci), GFP_KERNEL);
981 if (!sci)
982 return ERR_PTR(-ENOMEM);
983
984 if (of_property_read_u32(dev->of_node, "samsung,spi-src-clk", &temp)) {
985 dev_warn(dev, "spi bus clock parent not specified, using clock at index 0 as parent\n");
986 sci->src_clk_nr = 0;
987 } else {
988 sci->src_clk_nr = temp;
989 }
990
991 if (of_property_read_u32(dev->of_node, "num-cs", &temp)) {
992 dev_warn(dev, "number of chip select lines not specified, assuming 1 chip select line\n");
993 sci->num_cs = 1;
994 } else {
995 sci->num_cs = temp;
996 }
997
998 sci->no_cs = of_property_read_bool(dev->of_node, "no-cs-readback");
999
1000 return sci;
1001}
1002#else
1003static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev)
1004{
1005 return dev_get_platdata(dev);
1006}
1007#endif
1008
1009static const struct of_device_id s3c64xx_spi_dt_match[];
1010
1011static inline struct s3c64xx_spi_port_config *s3c64xx_spi_get_port_config(
1012 struct platform_device *pdev)
1013{
1014#ifdef CONFIG_OF
1015 if (pdev->dev.of_node) {
1016 const struct of_device_id *match;
1017 match = of_match_node(s3c64xx_spi_dt_match, pdev->dev.of_node);
1018 return (struct s3c64xx_spi_port_config *)match->data;
1019 }
1020#endif
1021 return (struct s3c64xx_spi_port_config *)
1022 platform_get_device_id(pdev)->driver_data;
1023}
1024
1025static int s3c64xx_spi_probe(struct platform_device *pdev)
1026{
1027 struct resource *mem_res;
1028 struct s3c64xx_spi_driver_data *sdd;
1029 struct s3c64xx_spi_info *sci = dev_get_platdata(&pdev->dev);
1030 struct spi_master *master;
1031 int ret, irq;
1032 char clk_name[16];
1033
1034 if (!sci && pdev->dev.of_node) {
1035 sci = s3c64xx_spi_parse_dt(&pdev->dev);
1036 if (IS_ERR(sci))
1037 return PTR_ERR(sci);
1038 }
1039
1040 if (!sci) {
1041 dev_err(&pdev->dev, "platform_data missing!\n");
1042 return -ENODEV;
1043 }
1044
1045 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1046 if (mem_res == NULL) {
1047 dev_err(&pdev->dev, "Unable to get SPI MEM resource\n");
1048 return -ENXIO;
1049 }
1050
1051 irq = platform_get_irq(pdev, 0);
1052 if (irq < 0) {
1053 dev_warn(&pdev->dev, "Failed to get IRQ: %d\n", irq);
1054 return irq;
1055 }
1056
1057 master = spi_alloc_master(&pdev->dev,
1058 sizeof(struct s3c64xx_spi_driver_data));
1059 if (master == NULL) {
1060 dev_err(&pdev->dev, "Unable to allocate SPI Master\n");
1061 return -ENOMEM;
1062 }
1063
1064 platform_set_drvdata(pdev, master);
1065
1066 sdd = spi_master_get_devdata(master);
1067 sdd->port_conf = s3c64xx_spi_get_port_config(pdev);
1068 sdd->master = master;
1069 sdd->cntrlr_info = sci;
1070 sdd->pdev = pdev;
1071 sdd->sfr_start = mem_res->start;
1072 if (pdev->dev.of_node) {
1073 ret = of_alias_get_id(pdev->dev.of_node, "spi");
1074 if (ret < 0) {
1075 dev_err(&pdev->dev, "failed to get alias id, errno %d\n",
1076 ret);
1077 goto err_deref_master;
1078 }
1079 sdd->port_id = ret;
1080 } else {
1081 sdd->port_id = pdev->id;
1082 }
1083
1084 sdd->cur_bpw = 8;
1085
1086 sdd->tx_dma.direction = DMA_MEM_TO_DEV;
1087 sdd->rx_dma.direction = DMA_DEV_TO_MEM;
1088
1089 master->dev.of_node = pdev->dev.of_node;
1090 master->bus_num = sdd->port_id;
1091 master->setup = s3c64xx_spi_setup;
1092 master->cleanup = s3c64xx_spi_cleanup;
1093 master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer;
1094 master->prepare_message = s3c64xx_spi_prepare_message;
1095 master->transfer_one = s3c64xx_spi_transfer_one;
1096 master->num_chipselect = sci->num_cs;
1097 master->dma_alignment = 8;
1098 master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) |
1099 SPI_BPW_MASK(8);
1100 /* the spi->mode bits understood by this driver: */
1101 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1102 master->auto_runtime_pm = true;
1103 if (!is_polling(sdd))
1104 master->can_dma = s3c64xx_spi_can_dma;
1105
1106 sdd->regs = devm_ioremap_resource(&pdev->dev, mem_res);
1107 if (IS_ERR(sdd->regs)) {
1108 ret = PTR_ERR(sdd->regs);
1109 goto err_deref_master;
1110 }
1111
1112 if (sci->cfg_gpio && sci->cfg_gpio()) {
1113 dev_err(&pdev->dev, "Unable to config gpio\n");
1114 ret = -EBUSY;
1115 goto err_deref_master;
1116 }
1117
1118 /* Setup clocks */
1119 sdd->clk = devm_clk_get(&pdev->dev, "spi");
1120 if (IS_ERR(sdd->clk)) {
1121 dev_err(&pdev->dev, "Unable to acquire clock 'spi'\n");
1122 ret = PTR_ERR(sdd->clk);
1123 goto err_deref_master;
1124 }
1125
1126 ret = clk_prepare_enable(sdd->clk);
1127 if (ret) {
1128 dev_err(&pdev->dev, "Couldn't enable clock 'spi'\n");
1129 goto err_deref_master;
1130 }
1131
1132 sprintf(clk_name, "spi_busclk%d", sci->src_clk_nr);
1133 sdd->src_clk = devm_clk_get(&pdev->dev, clk_name);
1134 if (IS_ERR(sdd->src_clk)) {
1135 dev_err(&pdev->dev,
1136 "Unable to acquire clock '%s'\n", clk_name);
1137 ret = PTR_ERR(sdd->src_clk);
1138 goto err_disable_clk;
1139 }
1140
1141 ret = clk_prepare_enable(sdd->src_clk);
1142 if (ret) {
1143 dev_err(&pdev->dev, "Couldn't enable clock '%s'\n", clk_name);
1144 goto err_disable_clk;
1145 }
1146
1147 if (sdd->port_conf->clk_ioclk) {
1148 sdd->ioclk = devm_clk_get(&pdev->dev, "spi_ioclk");
1149 if (IS_ERR(sdd->ioclk)) {
1150 dev_err(&pdev->dev, "Unable to acquire 'ioclk'\n");
1151 ret = PTR_ERR(sdd->ioclk);
1152 goto err_disable_src_clk;
1153 }
1154
1155 ret = clk_prepare_enable(sdd->ioclk);
1156 if (ret) {
1157 dev_err(&pdev->dev, "Couldn't enable clock 'ioclk'\n");
1158 goto err_disable_src_clk;
1159 }
1160 }
1161
1162 if (!is_polling(sdd)) {
1163 /* Acquire DMA channels */
1164 sdd->rx_dma.ch = dma_request_chan(&pdev->dev, "rx");
1165 if (IS_ERR(sdd->rx_dma.ch)) {
1166 dev_err(&pdev->dev, "Failed to get RX DMA channel\n");
1167 ret = PTR_ERR(sdd->rx_dma.ch);
1168 goto err_disable_io_clk;
1169 }
1170 sdd->tx_dma.ch = dma_request_chan(&pdev->dev, "tx");
1171 if (IS_ERR(sdd->tx_dma.ch)) {
1172 dev_err(&pdev->dev, "Failed to get TX DMA channel\n");
1173 ret = PTR_ERR(sdd->tx_dma.ch);
1174 goto err_release_rx_dma;
1175 }
1176 }
1177
1178 pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
1179 pm_runtime_use_autosuspend(&pdev->dev);
1180 pm_runtime_set_active(&pdev->dev);
1181 pm_runtime_enable(&pdev->dev);
1182 pm_runtime_get_sync(&pdev->dev);
1183
1184 /* Setup Deufult Mode */
1185 s3c64xx_spi_hwinit(sdd);
1186
1187 spin_lock_init(&sdd->lock);
1188 init_completion(&sdd->xfer_completion);
1189
1190 ret = devm_request_irq(&pdev->dev, irq, s3c64xx_spi_irq, 0,
1191 "spi-s3c64xx", sdd);
1192 if (ret != 0) {
1193 dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n",
1194 irq, ret);
1195 goto err_pm_put;
1196 }
1197
1198 writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN |
1199 S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
1200 sdd->regs + S3C64XX_SPI_INT_EN);
1201
1202 ret = devm_spi_register_master(&pdev->dev, master);
1203 if (ret != 0) {
1204 dev_err(&pdev->dev, "cannot register SPI master: %d\n", ret);
1205 goto err_pm_put;
1206 }
1207
1208 dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Slaves attached\n",
1209 sdd->port_id, master->num_chipselect);
1210 dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tFIFO %dbytes\n",
1211 mem_res, (FIFO_LVL_MASK(sdd) >> 1) + 1);
1212
1213 pm_runtime_mark_last_busy(&pdev->dev);
1214 pm_runtime_put_autosuspend(&pdev->dev);
1215
1216 return 0;
1217
1218err_pm_put:
1219 pm_runtime_put_noidle(&pdev->dev);
1220 pm_runtime_disable(&pdev->dev);
1221 pm_runtime_set_suspended(&pdev->dev);
1222
1223 if (!is_polling(sdd))
1224 dma_release_channel(sdd->tx_dma.ch);
1225err_release_rx_dma:
1226 if (!is_polling(sdd))
1227 dma_release_channel(sdd->rx_dma.ch);
1228err_disable_io_clk:
1229 clk_disable_unprepare(sdd->ioclk);
1230err_disable_src_clk:
1231 clk_disable_unprepare(sdd->src_clk);
1232err_disable_clk:
1233 clk_disable_unprepare(sdd->clk);
1234err_deref_master:
1235 spi_master_put(master);
1236
1237 return ret;
1238}
1239
1240static int s3c64xx_spi_remove(struct platform_device *pdev)
1241{
1242 struct spi_master *master = platform_get_drvdata(pdev);
1243 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1244
1245 pm_runtime_get_sync(&pdev->dev);
1246
1247 writel(0, sdd->regs + S3C64XX_SPI_INT_EN);
1248
1249 if (!is_polling(sdd)) {
1250 dma_release_channel(sdd->rx_dma.ch);
1251 dma_release_channel(sdd->tx_dma.ch);
1252 }
1253
1254 clk_disable_unprepare(sdd->ioclk);
1255
1256 clk_disable_unprepare(sdd->src_clk);
1257
1258 clk_disable_unprepare(sdd->clk);
1259
1260 pm_runtime_put_noidle(&pdev->dev);
1261 pm_runtime_disable(&pdev->dev);
1262 pm_runtime_set_suspended(&pdev->dev);
1263
1264 return 0;
1265}
1266
1267#ifdef CONFIG_PM_SLEEP
1268static int s3c64xx_spi_suspend(struct device *dev)
1269{
1270 struct spi_master *master = dev_get_drvdata(dev);
1271 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1272
1273 int ret = spi_master_suspend(master);
1274 if (ret)
1275 return ret;
1276
1277 ret = pm_runtime_force_suspend(dev);
1278 if (ret < 0)
1279 return ret;
1280
1281 sdd->cur_speed = 0; /* Output Clock is stopped */
1282
1283 return 0;
1284}
1285
1286static int s3c64xx_spi_resume(struct device *dev)
1287{
1288 struct spi_master *master = dev_get_drvdata(dev);
1289 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1290 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
1291 int ret;
1292
1293 if (sci->cfg_gpio)
1294 sci->cfg_gpio();
1295
1296 ret = pm_runtime_force_resume(dev);
1297 if (ret < 0)
1298 return ret;
1299
1300 return spi_master_resume(master);
1301}
1302#endif /* CONFIG_PM_SLEEP */
1303
1304#ifdef CONFIG_PM
1305static int s3c64xx_spi_runtime_suspend(struct device *dev)
1306{
1307 struct spi_master *master = dev_get_drvdata(dev);
1308 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1309
1310 clk_disable_unprepare(sdd->clk);
1311 clk_disable_unprepare(sdd->src_clk);
1312 clk_disable_unprepare(sdd->ioclk);
1313
1314 return 0;
1315}
1316
1317static int s3c64xx_spi_runtime_resume(struct device *dev)
1318{
1319 struct spi_master *master = dev_get_drvdata(dev);
1320 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1321 int ret;
1322
1323 if (sdd->port_conf->clk_ioclk) {
1324 ret = clk_prepare_enable(sdd->ioclk);
1325 if (ret != 0)
1326 return ret;
1327 }
1328
1329 ret = clk_prepare_enable(sdd->src_clk);
1330 if (ret != 0)
1331 goto err_disable_ioclk;
1332
1333 ret = clk_prepare_enable(sdd->clk);
1334 if (ret != 0)
1335 goto err_disable_src_clk;
1336
1337 s3c64xx_spi_hwinit(sdd);
1338
1339 return 0;
1340
1341err_disable_src_clk:
1342 clk_disable_unprepare(sdd->src_clk);
1343err_disable_ioclk:
1344 clk_disable_unprepare(sdd->ioclk);
1345
1346 return ret;
1347}
1348#endif /* CONFIG_PM */
1349
1350static const struct dev_pm_ops s3c64xx_spi_pm = {
1351 SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume)
1352 SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend,
1353 s3c64xx_spi_runtime_resume, NULL)
1354};
1355
1356static struct s3c64xx_spi_port_config s3c2443_spi_port_config = {
1357 .fifo_lvl_mask = { 0x7f },
1358 .rx_lvl_offset = 13,
1359 .tx_st_done = 21,
1360 .high_speed = true,
1361};
1362
1363static struct s3c64xx_spi_port_config s3c6410_spi_port_config = {
1364 .fifo_lvl_mask = { 0x7f, 0x7F },
1365 .rx_lvl_offset = 13,
1366 .tx_st_done = 21,
1367};
1368
1369static struct s3c64xx_spi_port_config s5pv210_spi_port_config = {
1370 .fifo_lvl_mask = { 0x1ff, 0x7F },
1371 .rx_lvl_offset = 15,
1372 .tx_st_done = 25,
1373 .high_speed = true,
1374};
1375
1376static struct s3c64xx_spi_port_config exynos4_spi_port_config = {
1377 .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F },
1378 .rx_lvl_offset = 15,
1379 .tx_st_done = 25,
1380 .high_speed = true,
1381 .clk_from_cmu = true,
1382};
1383
1384static struct s3c64xx_spi_port_config exynos7_spi_port_config = {
1385 .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F, 0x7F, 0x7F, 0x1ff},
1386 .rx_lvl_offset = 15,
1387 .tx_st_done = 25,
1388 .high_speed = true,
1389 .clk_from_cmu = true,
1390 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1391};
1392
1393static struct s3c64xx_spi_port_config exynos5433_spi_port_config = {
1394 .fifo_lvl_mask = { 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff},
1395 .rx_lvl_offset = 15,
1396 .tx_st_done = 25,
1397 .high_speed = true,
1398 .clk_from_cmu = true,
1399 .clk_ioclk = true,
1400 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1401};
1402
1403static const struct platform_device_id s3c64xx_spi_driver_ids[] = {
1404 {
1405 .name = "s3c2443-spi",
1406 .driver_data = (kernel_ulong_t)&s3c2443_spi_port_config,
1407 }, {
1408 .name = "s3c6410-spi",
1409 .driver_data = (kernel_ulong_t)&s3c6410_spi_port_config,
1410 },
1411 { },
1412};
1413
1414static const struct of_device_id s3c64xx_spi_dt_match[] = {
1415 { .compatible = "samsung,s3c2443-spi",
1416 .data = (void *)&s3c2443_spi_port_config,
1417 },
1418 { .compatible = "samsung,s3c6410-spi",
1419 .data = (void *)&s3c6410_spi_port_config,
1420 },
1421 { .compatible = "samsung,s5pv210-spi",
1422 .data = (void *)&s5pv210_spi_port_config,
1423 },
1424 { .compatible = "samsung,exynos4210-spi",
1425 .data = (void *)&exynos4_spi_port_config,
1426 },
1427 { .compatible = "samsung,exynos7-spi",
1428 .data = (void *)&exynos7_spi_port_config,
1429 },
1430 { .compatible = "samsung,exynos5433-spi",
1431 .data = (void *)&exynos5433_spi_port_config,
1432 },
1433 { },
1434};
1435MODULE_DEVICE_TABLE(of, s3c64xx_spi_dt_match);
1436
1437static struct platform_driver s3c64xx_spi_driver = {
1438 .driver = {
1439 .name = "s3c64xx-spi",
1440 .pm = &s3c64xx_spi_pm,
1441 .of_match_table = of_match_ptr(s3c64xx_spi_dt_match),
1442 },
1443 .probe = s3c64xx_spi_probe,
1444 .remove = s3c64xx_spi_remove,
1445 .id_table = s3c64xx_spi_driver_ids,
1446};
1447MODULE_ALIAS("platform:s3c64xx-spi");
1448
1449module_platform_driver(s3c64xx_spi_driver);
1450
1451MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
1452MODULE_DESCRIPTION("S3C64XX SPI Controller Driver");
1453MODULE_LICENSE("GPL");