?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mpt2sas: Fix for system hang when discovery in progress
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / spi / spi_s3c64xx.c
blob8945e201e42eb5a57d66d4a4f8ab762314f601a6
1 /* linux/drivers/spi/spi_s3c64xx.c
2 *
3 * Copyright (C) 2009 Samsung Electronics Ltd.
4 * Jaswinder Singh <jassi.brar@samsung.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/workqueue.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/spi/spi.h>
29
30 #include <mach/dma.h>
31 #include <plat/s3c64xx-spi.h>
32
33 /* Registers and bit-fields */
34
35 #define S3C64XX_SPI_CH_CFG 0x00
36 #define S3C64XX_SPI_CLK_CFG 0x04
37 #define S3C64XX_SPI_MODE_CFG 0x08
38 #define S3C64XX_SPI_SLAVE_SEL 0x0C
39 #define S3C64XX_SPI_INT_EN 0x10
40 #define S3C64XX_SPI_STATUS 0x14
41 #define S3C64XX_SPI_TX_DATA 0x18
42 #define S3C64XX_SPI_RX_DATA 0x1C
43 #define S3C64XX_SPI_PACKET_CNT 0x20
44 #define S3C64XX_SPI_PENDING_CLR 0x24
45 #define S3C64XX_SPI_SWAP_CFG 0x28
46 #define S3C64XX_SPI_FB_CLK 0x2C
47
48 #define S3C64XX_SPI_CH_HS_EN (1<<6) /* High Speed Enable */
49 #define S3C64XX_SPI_CH_SW_RST (1<<5)
50 #define S3C64XX_SPI_CH_SLAVE (1<<4)
51 #define S3C64XX_SPI_CPOL_L (1<<3)
52 #define S3C64XX_SPI_CPHA_B (1<<2)
53 #define S3C64XX_SPI_CH_RXCH_ON (1<<1)
54 #define S3C64XX_SPI_CH_TXCH_ON (1<<0)
55
56 #define S3C64XX_SPI_CLKSEL_SRCMSK (3<<9)
57 #define S3C64XX_SPI_CLKSEL_SRCSHFT 9
58 #define S3C64XX_SPI_ENCLK_ENABLE (1<<8)
59 #define S3C64XX_SPI_PSR_MASK 0xff
60
61 #define S3C64XX_SPI_MODE_CH_TSZ_BYTE (0<<29)
62 #define S3C64XX_SPI_MODE_CH_TSZ_HALFWORD (1<<29)
63 #define S3C64XX_SPI_MODE_CH_TSZ_WORD (2<<29)
64 #define S3C64XX_SPI_MODE_CH_TSZ_MASK (3<<29)
65 #define S3C64XX_SPI_MODE_BUS_TSZ_BYTE (0<<17)
66 #define S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD (1<<17)
67 #define S3C64XX_SPI_MODE_BUS_TSZ_WORD (2<<17)
68 #define S3C64XX_SPI_MODE_BUS_TSZ_MASK (3<<17)
69 #define S3C64XX_SPI_MODE_RXDMA_ON (1<<2)
70 #define S3C64XX_SPI_MODE_TXDMA_ON (1<<1)
71 #define S3C64XX_SPI_MODE_4BURST (1<<0)
72
73 #define S3C64XX_SPI_SLAVE_AUTO (1<<1)
74 #define S3C64XX_SPI_SLAVE_SIG_INACT (1<<0)
75
76 #define S3C64XX_SPI_ACT(c) writel(0, (c)->regs + S3C64XX_SPI_SLAVE_SEL)
77
78 #define S3C64XX_SPI_DEACT(c) writel(S3C64XX_SPI_SLAVE_SIG_INACT, \
79 (c)->regs + S3C64XX_SPI_SLAVE_SEL)
80
81 #define S3C64XX_SPI_INT_TRAILING_EN (1<<6)
82 #define S3C64XX_SPI_INT_RX_OVERRUN_EN (1<<5)
83 #define S3C64XX_SPI_INT_RX_UNDERRUN_EN (1<<4)
84 #define S3C64XX_SPI_INT_TX_OVERRUN_EN (1<<3)
85 #define S3C64XX_SPI_INT_TX_UNDERRUN_EN (1<<2)
86 #define S3C64XX_SPI_INT_RX_FIFORDY_EN (1<<1)
87 #define S3C64XX_SPI_INT_TX_FIFORDY_EN (1<<0)
88
89 #define S3C64XX_SPI_ST_RX_OVERRUN_ERR (1<<5)
90 #define S3C64XX_SPI_ST_RX_UNDERRUN_ERR (1<<4)
91 #define S3C64XX_SPI_ST_TX_OVERRUN_ERR (1<<3)
92 #define S3C64XX_SPI_ST_TX_UNDERRUN_ERR (1<<2)
93 #define S3C64XX_SPI_ST_RX_FIFORDY (1<<1)
94 #define S3C64XX_SPI_ST_TX_FIFORDY (1<<0)
95
96 #define S3C64XX_SPI_PACKET_CNT_EN (1<<16)
97
98 #define S3C64XX_SPI_PND_TX_UNDERRUN_CLR (1<<4)
99 #define S3C64XX_SPI_PND_TX_OVERRUN_CLR (1<<3)
100 #define S3C64XX_SPI_PND_RX_UNDERRUN_CLR (1<<2)
101 #define S3C64XX_SPI_PND_RX_OVERRUN_CLR (1<<1)
102 #define S3C64XX_SPI_PND_TRAILING_CLR (1<<0)
103
104 #define S3C64XX_SPI_SWAP_RX_HALF_WORD (1<<7)
105 #define S3C64XX_SPI_SWAP_RX_BYTE (1<<6)
106 #define S3C64XX_SPI_SWAP_RX_BIT (1<<5)
107 #define S3C64XX_SPI_SWAP_RX_EN (1<<4)
108 #define S3C64XX_SPI_SWAP_TX_HALF_WORD (1<<3)
109 #define S3C64XX_SPI_SWAP_TX_BYTE (1<<2)
110 #define S3C64XX_SPI_SWAP_TX_BIT (1<<1)
111 #define S3C64XX_SPI_SWAP_TX_EN (1<<0)
112
113 #define S3C64XX_SPI_FBCLK_MSK (3<<0)
114
115 #define S3C64XX_SPI_ST_TRLCNTZ(v, i) ((((v) >> (i)->rx_lvl_offset) & \
116 (((i)->fifo_lvl_mask + 1))) \
117 ? 1 : 0)
118
119 #define S3C64XX_SPI_ST_TX_DONE(v, i) (((v) & (1 << (i)->tx_st_done)) ? 1 : 0)
120 #define TX_FIFO_LVL(v, i) (((v) >> 6) & (i)->fifo_lvl_mask)
121 #define RX_FIFO_LVL(v, i) (((v) >> (i)->rx_lvl_offset) & (i)->fifo_lvl_mask)
122
123 #define S3C64XX_SPI_MAX_TRAILCNT 0x3ff
124 #define S3C64XX_SPI_TRAILCNT_OFF 19
125
126 #define S3C64XX_SPI_TRAILCNT S3C64XX_SPI_MAX_TRAILCNT
127
128 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
129
130 #define SUSPND (1<<0)
131 #define SPIBUSY (1<<1)
132 #define RXBUSY (1<<2)
133 #define TXBUSY (1<<3)
134
135 /**
136 * struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver.
137 * @clk: Pointer to the spi clock.
138 * @src_clk: Pointer to the clock used to generate SPI signals.
139 * @master: Pointer to the SPI Protocol master.
140 * @workqueue: Work queue for the SPI xfer requests.
141 * @cntrlr_info: Platform specific data for the controller this driver manages.
142 * @tgl_spi: Pointer to the last CS left untoggled by the cs_change hint.
143 * @work: Work
144 * @queue: To log SPI xfer requests.
145 * @lock: Controller specific lock.
146 * @state: Set of FLAGS to indicate status.
147 * @rx_dmach: Controller's DMA channel for Rx.
148 * @tx_dmach: Controller's DMA channel for Tx.
149 * @sfr_start: BUS address of SPI controller regs.
150 * @regs: Pointer to ioremap'ed controller registers.
151 * @xfer_completion: To indicate completion of xfer task.
152 * @cur_mode: Stores the active configuration of the controller.
153 * @cur_bpw: Stores the active bits per word settings.
154 * @cur_speed: Stores the active xfer clock speed.
155 */
156 struct s3c64xx_spi_driver_data {
157 void __iomem *regs;
158 struct clk *clk;
159 struct clk *src_clk;
160 struct platform_device *pdev;
161 struct spi_master *master;
162 struct workqueue_struct *workqueue;
163 struct s3c64xx_spi_info *cntrlr_info;
164 struct spi_device *tgl_spi;
165 struct work_struct work;
166 struct list_head queue;
167 spinlock_t lock;
168 enum dma_ch rx_dmach;
169 enum dma_ch tx_dmach;
170 unsigned long sfr_start;
171 struct completion xfer_completion;
172 unsigned state;
173 unsigned cur_mode, cur_bpw;
174 unsigned cur_speed;
175 };
176
177 static struct s3c2410_dma_client s3c64xx_spi_dma_client = {
178 .name = "samsung-spi-dma",
179 };
180
181 static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
182 {
183 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
184 void __iomem *regs = sdd->regs;
185 unsigned long loops;
186 u32 val;
187
188 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
189
190 val = readl(regs + S3C64XX_SPI_CH_CFG);
191 val |= S3C64XX_SPI_CH_SW_RST;
192 val &= ~S3C64XX_SPI_CH_HS_EN;
193 writel(val, regs + S3C64XX_SPI_CH_CFG);
194
195 /* Flush TxFIFO*/
196 loops = msecs_to_loops(1);
197 do {
198 val = readl(regs + S3C64XX_SPI_STATUS);
199 } while (TX_FIFO_LVL(val, sci) && loops--);
200
201 if (loops == 0)
202 dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n");
203
204 /* Flush RxFIFO*/
205 loops = msecs_to_loops(1);
206 do {
207 val = readl(regs + S3C64XX_SPI_STATUS);
208 if (RX_FIFO_LVL(val, sci))
209 readl(regs + S3C64XX_SPI_RX_DATA);
210 else
211 break;
212 } while (loops--);
213
214 if (loops == 0)
215 dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n");
216
217 val = readl(regs + S3C64XX_SPI_CH_CFG);
218 val &= ~S3C64XX_SPI_CH_SW_RST;
219 writel(val, regs + S3C64XX_SPI_CH_CFG);
220
221 val = readl(regs + S3C64XX_SPI_MODE_CFG);
222 val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
223 writel(val, regs + S3C64XX_SPI_MODE_CFG);
224
225 val = readl(regs + S3C64XX_SPI_CH_CFG);
226 val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON);
227 writel(val, regs + S3C64XX_SPI_CH_CFG);
228 }
229
230 static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
231 struct spi_device *spi,
232 struct spi_transfer *xfer, int dma_mode)
233 {
234 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
235 void __iomem *regs = sdd->regs;
236 u32 modecfg, chcfg;
237
238 modecfg = readl(regs + S3C64XX_SPI_MODE_CFG);
239 modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
240
241 chcfg = readl(regs + S3C64XX_SPI_CH_CFG);
242 chcfg &= ~S3C64XX_SPI_CH_TXCH_ON;
243
244 if (dma_mode) {
245 chcfg &= ~S3C64XX_SPI_CH_RXCH_ON;
246 } else {
247 /* Always shift in data in FIFO, even if xfer is Tx only,
248 * this helps setting PCKT_CNT value for generating clocks
249 * as exactly needed.
250 */
251 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
252 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
253 | S3C64XX_SPI_PACKET_CNT_EN,
254 regs + S3C64XX_SPI_PACKET_CNT);
255 }
256
257 if (xfer->tx_buf != NULL) {
258 sdd->state |= TXBUSY;
259 chcfg |= S3C64XX_SPI_CH_TXCH_ON;
260 if (dma_mode) {
261 modecfg |= S3C64XX_SPI_MODE_TXDMA_ON;
262 s3c2410_dma_config(sdd->tx_dmach, sdd->cur_bpw / 8);
263 s3c2410_dma_enqueue(sdd->tx_dmach, (void *)sdd,
264 xfer->tx_dma, xfer->len);
265 s3c2410_dma_ctrl(sdd->tx_dmach, S3C2410_DMAOP_START);
266 } else {
267 switch (sdd->cur_bpw) {
268 case 32:
269 iowrite32_rep(regs + S3C64XX_SPI_TX_DATA,
270 xfer->tx_buf, xfer->len / 4);
271 break;
272 case 16:
273 iowrite16_rep(regs + S3C64XX_SPI_TX_DATA,
274 xfer->tx_buf, xfer->len / 2);
275 break;
276 default:
277 iowrite8_rep(regs + S3C64XX_SPI_TX_DATA,
278 xfer->tx_buf, xfer->len);
279 break;
280 }
281 }
282 }
283
284 if (xfer->rx_buf != NULL) {
285 sdd->state |= RXBUSY;
286
287 if (sci->high_speed && sdd->cur_speed >= 30000000UL
288 && !(sdd->cur_mode & SPI_CPHA))
289 chcfg |= S3C64XX_SPI_CH_HS_EN;
290
291 if (dma_mode) {
292 modecfg |= S3C64XX_SPI_MODE_RXDMA_ON;
293 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
294 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
295 | S3C64XX_SPI_PACKET_CNT_EN,
296 regs + S3C64XX_SPI_PACKET_CNT);
297 s3c2410_dma_config(sdd->rx_dmach, sdd->cur_bpw / 8);
298 s3c2410_dma_enqueue(sdd->rx_dmach, (void *)sdd,
299 xfer->rx_dma, xfer->len);
300 s3c2410_dma_ctrl(sdd->rx_dmach, S3C2410_DMAOP_START);
301 }
302 }
303
304 writel(modecfg, regs + S3C64XX_SPI_MODE_CFG);
305 writel(chcfg, regs + S3C64XX_SPI_CH_CFG);
306 }
307
308 static inline void enable_cs(struct s3c64xx_spi_driver_data *sdd,
309 struct spi_device *spi)
310 {
311 struct s3c64xx_spi_csinfo *cs;
312
313 if (sdd->tgl_spi != NULL) { /* If last device toggled after mssg */
314 if (sdd->tgl_spi != spi) { /* if last mssg on diff device */
315 /* Deselect the last toggled device */
316 cs = sdd->tgl_spi->controller_data;
317 cs->set_level(cs->line,
318 spi->mode & SPI_CS_HIGH ? 0 : 1);
319 }
320 sdd->tgl_spi = NULL;
321 }
322
323 cs = spi->controller_data;
324 cs->set_level(cs->line, spi->mode & SPI_CS_HIGH ? 1 : 0);
325 }
326
327 static int wait_for_xfer(struct s3c64xx_spi_driver_data *sdd,
328 struct spi_transfer *xfer, int dma_mode)
329 {
330 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
331 void __iomem *regs = sdd->regs;
332 unsigned long val;
333 int ms;
334
335 /* millisecs to xfer 'len' bytes @ 'cur_speed' */
336 ms = xfer->len * 8 * 1000 / sdd->cur_speed;
337 ms += 10; /* some tolerance */
338
339 if (dma_mode) {
340 val = msecs_to_jiffies(ms) + 10;
341 val = wait_for_completion_timeout(&sdd->xfer_completion, val);
342 } else {
343 u32 status;
344 val = msecs_to_loops(ms);
345 do {
346 status = readl(regs + S3C64XX_SPI_STATUS);
347 } while (RX_FIFO_LVL(status, sci) < xfer->len && --val);
348 }
349
350 if (!val)
351 return -EIO;
352
353 if (dma_mode) {
354 u32 status;
355
356 /*
357 * DmaTx returns after simply writing data in the FIFO,
358 * w/o waiting for real transmission on the bus to finish.
359 * DmaRx returns only after Dma read data from FIFO which
360 * needs bus transmission to finish, so we don't worry if
361 * Xfer involved Rx(with or without Tx).
362 */
363 if (xfer->rx_buf == NULL) {
364 val = msecs_to_loops(10);
365 status = readl(regs + S3C64XX_SPI_STATUS);
366 while ((TX_FIFO_LVL(status, sci)
367 || !S3C64XX_SPI_ST_TX_DONE(status, sci))
368 && --val) {
369 cpu_relax();
370 status = readl(regs + S3C64XX_SPI_STATUS);
371 }
372
373 if (!val)
374 return -EIO;
375 }
376 } else {
377 /* If it was only Tx */
378 if (xfer->rx_buf == NULL) {
379 sdd->state &= ~TXBUSY;
380 return 0;
381 }
382
383 switch (sdd->cur_bpw) {
384 case 32:
385 ioread32_rep(regs + S3C64XX_SPI_RX_DATA,
386 xfer->rx_buf, xfer->len / 4);
387 break;
388 case 16:
389 ioread16_rep(regs + S3C64XX_SPI_RX_DATA,
390 xfer->rx_buf, xfer->len / 2);
391 break;
392 default:
393 ioread8_rep(regs + S3C64XX_SPI_RX_DATA,
394 xfer->rx_buf, xfer->len);
395 break;
396 }
397 sdd->state &= ~RXBUSY;
398 }
399
400 return 0;
401 }
402
403 static inline void disable_cs(struct s3c64xx_spi_driver_data *sdd,
404 struct spi_device *spi)
405 {
406 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
407
408 if (sdd->tgl_spi == spi)
409 sdd->tgl_spi = NULL;
410
411 cs->set_level(cs->line, spi->mode & SPI_CS_HIGH ? 0 : 1);
412 }
413
414 static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
415 {
416 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
417 void __iomem *regs = sdd->regs;
418 u32 val;
419
420 /* Disable Clock */
421 if (sci->clk_from_cmu) {
422 clk_disable(sdd->src_clk);
423 } else {
424 val = readl(regs + S3C64XX_SPI_CLK_CFG);
425 val &= ~S3C64XX_SPI_ENCLK_ENABLE;
426 writel(val, regs + S3C64XX_SPI_CLK_CFG);
427 }
428
429 /* Set Polarity and Phase */
430 val = readl(regs + S3C64XX_SPI_CH_CFG);
431 val &= ~(S3C64XX_SPI_CH_SLAVE |
432 S3C64XX_SPI_CPOL_L |
433 S3C64XX_SPI_CPHA_B);
434
435 if (sdd->cur_mode & SPI_CPOL)
436 val |= S3C64XX_SPI_CPOL_L;
437
438 if (sdd->cur_mode & SPI_CPHA)
439 val |= S3C64XX_SPI_CPHA_B;
440
441 writel(val, regs + S3C64XX_SPI_CH_CFG);
442
443 /* Set Channel & DMA Mode */
444 val = readl(regs + S3C64XX_SPI_MODE_CFG);
445 val &= ~(S3C64XX_SPI_MODE_BUS_TSZ_MASK
446 | S3C64XX_SPI_MODE_CH_TSZ_MASK);
447
448 switch (sdd->cur_bpw) {
449 case 32:
450 val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD;
451 val |= S3C64XX_SPI_MODE_CH_TSZ_WORD;
452 break;
453 case 16:
454 val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD;
455 val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD;
456 break;
457 default:
458 val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE;
459 val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE;
460 break;
461 }
462
463 writel(val, regs + S3C64XX_SPI_MODE_CFG);
464
465 if (sci->clk_from_cmu) {
466 /* Configure Clock */
467 /* There is half-multiplier before the SPI */
468 clk_set_rate(sdd->src_clk, sdd->cur_speed * 2);
469 /* Enable Clock */
470 clk_enable(sdd->src_clk);
471 } else {
472 /* Configure Clock */
473 val = readl(regs + S3C64XX_SPI_CLK_CFG);
474 val &= ~S3C64XX_SPI_PSR_MASK;
475 val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1)
476 & S3C64XX_SPI_PSR_MASK);
477 writel(val, regs + S3C64XX_SPI_CLK_CFG);
478
479 /* Enable Clock */
480 val = readl(regs + S3C64XX_SPI_CLK_CFG);
481 val |= S3C64XX_SPI_ENCLK_ENABLE;
482 writel(val, regs + S3C64XX_SPI_CLK_CFG);
483 }
484 }
485
486 static void s3c64xx_spi_dma_rxcb(struct s3c2410_dma_chan *chan, void *buf_id,
487 int size, enum s3c2410_dma_buffresult res)
488 {
489 struct s3c64xx_spi_driver_data *sdd = buf_id;
490 unsigned long flags;
491
492 spin_lock_irqsave(&sdd->lock, flags);
493
494 if (res == S3C2410_RES_OK)
495 sdd->state &= ~RXBUSY;
496 else
497 dev_err(&sdd->pdev->dev, "DmaAbrtRx-%d\n", size);
498
499 /* If the other done */
500 if (!(sdd->state & TXBUSY))
501 complete(&sdd->xfer_completion);
502
503 spin_unlock_irqrestore(&sdd->lock, flags);
504 }
505
506 static void s3c64xx_spi_dma_txcb(struct s3c2410_dma_chan *chan, void *buf_id,
507 int size, enum s3c2410_dma_buffresult res)
508 {
509 struct s3c64xx_spi_driver_data *sdd = buf_id;
510 unsigned long flags;
511
512 spin_lock_irqsave(&sdd->lock, flags);
513
514 if (res == S3C2410_RES_OK)
515 sdd->state &= ~TXBUSY;
516 else
517 dev_err(&sdd->pdev->dev, "DmaAbrtTx-%d \n", size);
518
519 /* If the other done */
520 if (!(sdd->state & RXBUSY))
521 complete(&sdd->xfer_completion);
522
523 spin_unlock_irqrestore(&sdd->lock, flags);
524 }
525
526 #define XFER_DMAADDR_INVALID DMA_BIT_MASK(32)
527
528 static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd,
529 struct spi_message *msg)
530 {
531 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
532 struct device *dev = &sdd->pdev->dev;
533 struct spi_transfer *xfer;
534
535 if (msg->is_dma_mapped)
536 return 0;
537
538 /* First mark all xfer unmapped */
539 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
540 xfer->rx_dma = XFER_DMAADDR_INVALID;
541 xfer->tx_dma = XFER_DMAADDR_INVALID;
542 }
543
544 /* Map until end or first fail */
545 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
546
547 if (xfer->len <= ((sci->fifo_lvl_mask >> 1) + 1))
548 continue;
549
550 if (xfer->tx_buf != NULL) {
551 xfer->tx_dma = dma_map_single(dev,
552 (void *)xfer->tx_buf, xfer->len,
553 DMA_TO_DEVICE);
554 if (dma_mapping_error(dev, xfer->tx_dma)) {
555 dev_err(dev, "dma_map_single Tx failed\n");
556 xfer->tx_dma = XFER_DMAADDR_INVALID;
557 return -ENOMEM;
558 }
559 }
560
561 if (xfer->rx_buf != NULL) {
562 xfer->rx_dma = dma_map_single(dev, xfer->rx_buf,
563 xfer->len, DMA_FROM_DEVICE);
564 if (dma_mapping_error(dev, xfer->rx_dma)) {
565 dev_err(dev, "dma_map_single Rx failed\n");
566 dma_unmap_single(dev, xfer->tx_dma,
567 xfer->len, DMA_TO_DEVICE);
568 xfer->tx_dma = XFER_DMAADDR_INVALID;
569 xfer->rx_dma = XFER_DMAADDR_INVALID;
570 return -ENOMEM;
571 }
572 }
573 }
574
575 return 0;
576 }
577
578 static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd,
579 struct spi_message *msg)
580 {
581 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
582 struct device *dev = &sdd->pdev->dev;
583 struct spi_transfer *xfer;
584
585 if (msg->is_dma_mapped)
586 return;
587
588 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
589
590 if (xfer->len <= ((sci->fifo_lvl_mask >> 1) + 1))
591 continue;
592
593 if (xfer->rx_buf != NULL
594 && xfer->rx_dma != XFER_DMAADDR_INVALID)
595 dma_unmap_single(dev, xfer->rx_dma,
596 xfer->len, DMA_FROM_DEVICE);
597
598 if (xfer->tx_buf != NULL
599 && xfer->tx_dma != XFER_DMAADDR_INVALID)
600 dma_unmap_single(dev, xfer->tx_dma,
601 xfer->len, DMA_TO_DEVICE);
602 }
603 }
604
605 static void handle_msg(struct s3c64xx_spi_driver_data *sdd,
606 struct spi_message *msg)
607 {
608 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
609 struct spi_device *spi = msg->spi;
610 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
611 struct spi_transfer *xfer;
612 int status = 0, cs_toggle = 0;
613 u32 speed;
614 u8 bpw;
615
616 /* If Master's(controller) state differs from that needed by Slave */
617 if (sdd->cur_speed != spi->max_speed_hz
618 || sdd->cur_mode != spi->mode
619 || sdd->cur_bpw != spi->bits_per_word) {
620 sdd->cur_bpw = spi->bits_per_word;
621 sdd->cur_speed = spi->max_speed_hz;
622 sdd->cur_mode = spi->mode;
623 s3c64xx_spi_config(sdd);
624 }
625
626 /* Map all the transfers if needed */
627 if (s3c64xx_spi_map_mssg(sdd, msg)) {
628 dev_err(&spi->dev,
629 "Xfer: Unable to map message buffers!\n");
630 status = -ENOMEM;
631 goto out;
632 }
633
634 /* Configure feedback delay */
635 writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK);
636
637 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
638
639 unsigned long flags;
640 int use_dma;
641
642 INIT_COMPLETION(sdd->xfer_completion);
643
644 /* Only BPW and Speed may change across transfers */
645 bpw = xfer->bits_per_word ? : spi->bits_per_word;
646 speed = xfer->speed_hz ? : spi->max_speed_hz;
647
648 if (xfer->len % (bpw / 8)) {
649 dev_err(&spi->dev,
650 "Xfer length(%u) not a multiple of word size(%u)\n",
651 xfer->len, bpw / 8);
652 status = -EIO;
653 goto out;
654 }
655
656 if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) {
657 sdd->cur_bpw = bpw;
658 sdd->cur_speed = speed;
659 s3c64xx_spi_config(sdd);
660 }
661
662 /* Polling method for xfers not bigger than FIFO capacity */
663 if (xfer->len <= ((sci->fifo_lvl_mask >> 1) + 1))
664 use_dma = 0;
665 else
666 use_dma = 1;
667
668 spin_lock_irqsave(&sdd->lock, flags);
669
670 /* Pending only which is to be done */
671 sdd->state &= ~RXBUSY;
672 sdd->state &= ~TXBUSY;
673
674 enable_datapath(sdd, spi, xfer, use_dma);
675
676 /* Slave Select */
677 enable_cs(sdd, spi);
678
679 /* Start the signals */
680 S3C64XX_SPI_ACT(sdd);
681
682 spin_unlock_irqrestore(&sdd->lock, flags);
683
684 status = wait_for_xfer(sdd, xfer, use_dma);
685
686 /* Quiese the signals */
687 S3C64XX_SPI_DEACT(sdd);
688
689 if (status) {
690 dev_err(&spi->dev, "I/O Error: "
691 "rx-%d tx-%d res:rx-%c tx-%c len-%d\n",
692 xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
693 (sdd->state & RXBUSY) ? 'f' : 'p',
694 (sdd->state & TXBUSY) ? 'f' : 'p',
695 xfer->len);
696
697 if (use_dma) {
698 if (xfer->tx_buf != NULL
699 && (sdd->state & TXBUSY))
700 s3c2410_dma_ctrl(sdd->tx_dmach,
701 S3C2410_DMAOP_FLUSH);
702 if (xfer->rx_buf != NULL
703 && (sdd->state & RXBUSY))
704 s3c2410_dma_ctrl(sdd->rx_dmach,
705 S3C2410_DMAOP_FLUSH);
706 }
707
708 goto out;
709 }
710
711 if (xfer->delay_usecs)
712 udelay(xfer->delay_usecs);
713
714 if (xfer->cs_change) {
715 /* Hint that the next mssg is gonna be
716 for the same device */
717 if (list_is_last(&xfer->transfer_list,
718 &msg->transfers))
719 cs_toggle = 1;
720 else
721 disable_cs(sdd, spi);
722 }
723
724 msg->actual_length += xfer->len;
725
726 flush_fifo(sdd);
727 }
728
729 out:
730 if (!cs_toggle || status)
731 disable_cs(sdd, spi);
732 else
733 sdd->tgl_spi = spi;
734
735 s3c64xx_spi_unmap_mssg(sdd, msg);
736
737 msg->status = status;
738
739 if (msg->complete)
740 msg->complete(msg->context);
741 }
742
743 static int acquire_dma(struct s3c64xx_spi_driver_data *sdd)
744 {
745 if (s3c2410_dma_request(sdd->rx_dmach,
746 &s3c64xx_spi_dma_client, NULL) < 0) {
747 dev_err(&sdd->pdev->dev, "cannot get RxDMA\n");
748 return 0;
749 }
750 s3c2410_dma_set_buffdone_fn(sdd->rx_dmach, s3c64xx_spi_dma_rxcb);
751 s3c2410_dma_devconfig(sdd->rx_dmach, S3C2410_DMASRC_HW,
752 sdd->sfr_start + S3C64XX_SPI_RX_DATA);
753
754 if (s3c2410_dma_request(sdd->tx_dmach,
755 &s3c64xx_spi_dma_client, NULL) < 0) {
756 dev_err(&sdd->pdev->dev, "cannot get TxDMA\n");
757 s3c2410_dma_free(sdd->rx_dmach, &s3c64xx_spi_dma_client);
758 return 0;
759 }
760 s3c2410_dma_set_buffdone_fn(sdd->tx_dmach, s3c64xx_spi_dma_txcb);
761 s3c2410_dma_devconfig(sdd->tx_dmach, S3C2410_DMASRC_MEM,
762 sdd->sfr_start + S3C64XX_SPI_TX_DATA);
763
764 return 1;
765 }
766
767 static void s3c64xx_spi_work(struct work_struct *work)
768 {
769 struct s3c64xx_spi_driver_data *sdd = container_of(work,
770 struct s3c64xx_spi_driver_data, work);
771 unsigned long flags;
772
773 /* Acquire DMA channels */
774 while (!acquire_dma(sdd))
775 msleep(10);
776
777 spin_lock_irqsave(&sdd->lock, flags);
778
779 while (!list_empty(&sdd->queue)
780 && !(sdd->state & SUSPND)) {
781
782 struct spi_message *msg;
783
784 msg = container_of(sdd->queue.next, struct spi_message, queue);
785
786 list_del_init(&msg->queue);
787
788 /* Set Xfer busy flag */
789 sdd->state |= SPIBUSY;
790
791 spin_unlock_irqrestore(&sdd->lock, flags);
792
793 handle_msg(sdd, msg);
794
795 spin_lock_irqsave(&sdd->lock, flags);
796
797 sdd->state &= ~SPIBUSY;
798 }
799
800 spin_unlock_irqrestore(&sdd->lock, flags);
801
802 /* Free DMA channels */
803 s3c2410_dma_free(sdd->tx_dmach, &s3c64xx_spi_dma_client);
804 s3c2410_dma_free(sdd->rx_dmach, &s3c64xx_spi_dma_client);
805 }
806
807 static int s3c64xx_spi_transfer(struct spi_device *spi,
808 struct spi_message *msg)
809 {
810 struct s3c64xx_spi_driver_data *sdd;
811 unsigned long flags;
812
813 sdd = spi_master_get_devdata(spi->master);
814
815 spin_lock_irqsave(&sdd->lock, flags);
816
817 if (sdd->state & SUSPND) {
818 spin_unlock_irqrestore(&sdd->lock, flags);
819 return -ESHUTDOWN;
820 }
821
822 msg->status = -EINPROGRESS;
823 msg->actual_length = 0;
824
825 list_add_tail(&msg->queue, &sdd->queue);
826
827 queue_work(sdd->workqueue, &sdd->work);
828
829 spin_unlock_irqrestore(&sdd->lock, flags);
830
831 return 0;
832 }
833
834 /*
835 * Here we only check the validity of requested configuration
836 * and save the configuration in a local data-structure.
837 * The controller is actually configured only just before we
838 * get a message to transfer.
839 */
840 static int s3c64xx_spi_setup(struct spi_device *spi)
841 {
842 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
843 struct s3c64xx_spi_driver_data *sdd;
844 struct s3c64xx_spi_info *sci;
845 struct spi_message *msg;
846 unsigned long flags;
847 int err = 0;
848
849 if (cs == NULL || cs->set_level == NULL) {
850 dev_err(&spi->dev, "No CS for SPI(%d)\n", spi->chip_select);
851 return -ENODEV;
852 }
853
854 sdd = spi_master_get_devdata(spi->master);
855 sci = sdd->cntrlr_info;
856
857 spin_lock_irqsave(&sdd->lock, flags);
858
859 list_for_each_entry(msg, &sdd->queue, queue) {
860 /* Is some mssg is already queued for this device */
861 if (msg->spi == spi) {
862 dev_err(&spi->dev,
863 "setup: attempt while mssg in queue!\n");
864 spin_unlock_irqrestore(&sdd->lock, flags);
865 return -EBUSY;
866 }
867 }
868
869 if (sdd->state & SUSPND) {
870 spin_unlock_irqrestore(&sdd->lock, flags);
871 dev_err(&spi->dev,
872 "setup: SPI-%d not active!\n", spi->master->bus_num);
873 return -ESHUTDOWN;
874 }
875
876 spin_unlock_irqrestore(&sdd->lock, flags);
877
878 if (spi->bits_per_word != 8
879 && spi->bits_per_word != 16
880 && spi->bits_per_word != 32) {
881 dev_err(&spi->dev, "setup: %dbits/wrd not supported!\n",
882 spi->bits_per_word);
883 err = -EINVAL;
884 goto setup_exit;
885 }
886
887 /* Check if we can provide the requested rate */
888 if (!sci->clk_from_cmu) {
889 u32 psr, speed;
890
891 /* Max possible */
892 speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1);
893
894 if (spi->max_speed_hz > speed)
895 spi->max_speed_hz = speed;
896
897 psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1;
898 psr &= S3C64XX_SPI_PSR_MASK;
899 if (psr == S3C64XX_SPI_PSR_MASK)
900 psr--;
901
902 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
903 if (spi->max_speed_hz < speed) {
904 if (psr+1 < S3C64XX_SPI_PSR_MASK) {
905 psr++;
906 } else {
907 err = -EINVAL;
908 goto setup_exit;
909 }
910 }
911
912 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
913 if (spi->max_speed_hz >= speed)
914 spi->max_speed_hz = speed;
915 else
916 err = -EINVAL;
917 }
918
919 setup_exit:
920
921 /* setup() returns with device de-selected */
922 disable_cs(sdd, spi);
923
924 return err;
925 }
926
927 static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel)
928 {
929 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
930 void __iomem *regs = sdd->regs;
931 unsigned int val;
932
933 sdd->cur_speed = 0;
934
935 S3C64XX_SPI_DEACT(sdd);
936
937 /* Disable Interrupts - we use Polling if not DMA mode */
938 writel(0, regs + S3C64XX_SPI_INT_EN);
939
940 if (!sci->clk_from_cmu)
941 writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT,
942 regs + S3C64XX_SPI_CLK_CFG);
943 writel(0, regs + S3C64XX_SPI_MODE_CFG);
944 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
945
946 /* Clear any irq pending bits */
947 writel(readl(regs + S3C64XX_SPI_PENDING_CLR),
948 regs + S3C64XX_SPI_PENDING_CLR);
949
950 writel(0, regs + S3C64XX_SPI_SWAP_CFG);
951
952 val = readl(regs + S3C64XX_SPI_MODE_CFG);
953 val &= ~S3C64XX_SPI_MODE_4BURST;
954 val &= ~(S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
955 val |= (S3C64XX_SPI_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
956 writel(val, regs + S3C64XX_SPI_MODE_CFG);
957
958 flush_fifo(sdd);
959 }
960
961 static int __init s3c64xx_spi_probe(struct platform_device *pdev)
962 {
963 struct resource *mem_res, *dmatx_res, *dmarx_res;
964 struct s3c64xx_spi_driver_data *sdd;
965 struct s3c64xx_spi_info *sci;
966 struct spi_master *master;
967 int ret;
968
969 if (pdev->id < 0) {
970 dev_err(&pdev->dev,
971 "Invalid platform device id-%d\n", pdev->id);
972 return -ENODEV;
973 }
974
975 if (pdev->dev.platform_data == NULL) {
976 dev_err(&pdev->dev, "platform_data missing!\n");
977 return -ENODEV;
978 }
979
980 sci = pdev->dev.platform_data;
981 if (!sci->src_clk_name) {
982 dev_err(&pdev->dev,
983 "Board init must call s3c64xx_spi_set_info()\n");
984 return -EINVAL;
985 }
986
987 /* Check for availability of necessary resource */
988
989 dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
990 if (dmatx_res == NULL) {
991 dev_err(&pdev->dev, "Unable to get SPI-Tx dma resource\n");
992 return -ENXIO;
993 }
994
995 dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
996 if (dmarx_res == NULL) {
997 dev_err(&pdev->dev, "Unable to get SPI-Rx dma resource\n");
998 return -ENXIO;
999 }
1000
1001 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1002 if (mem_res == NULL) {
1003 dev_err(&pdev->dev, "Unable to get SPI MEM resource\n");
1004 return -ENXIO;
1005 }
1006
1007 master = spi_alloc_master(&pdev->dev,
1008 sizeof(struct s3c64xx_spi_driver_data));
1009 if (master == NULL) {
1010 dev_err(&pdev->dev, "Unable to allocate SPI Master\n");
1011 return -ENOMEM;
1012 }
1013
1014 platform_set_drvdata(pdev, master);
1015
1016 sdd = spi_master_get_devdata(master);
1017 sdd->master = master;
1018 sdd->cntrlr_info = sci;
1019 sdd->pdev = pdev;
1020 sdd->sfr_start = mem_res->start;
1021 sdd->tx_dmach = dmatx_res->start;
1022 sdd->rx_dmach = dmarx_res->start;
1023
1024 sdd->cur_bpw = 8;
1025
1026 master->bus_num = pdev->id;
1027 master->setup = s3c64xx_spi_setup;
1028 master->transfer = s3c64xx_spi_transfer;
1029 master->num_chipselect = sci->num_cs;
1030 master->dma_alignment = 8;
1031 /* the spi->mode bits understood by this driver: */
1032 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1033
1034 if (request_mem_region(mem_res->start,
1035 resource_size(mem_res), pdev->name) == NULL) {
1036 dev_err(&pdev->dev, "Req mem region failed\n");
1037 ret = -ENXIO;
1038 goto err0;
1039 }
1040
1041 sdd->regs = ioremap(mem_res->start, resource_size(mem_res));
1042 if (sdd->regs == NULL) {
1043 dev_err(&pdev->dev, "Unable to remap IO\n");
1044 ret = -ENXIO;
1045 goto err1;
1046 }
1047
1048 if (sci->cfg_gpio == NULL || sci->cfg_gpio(pdev)) {
1049 dev_err(&pdev->dev, "Unable to config gpio\n");
1050 ret = -EBUSY;
1051 goto err2;
1052 }
1053
1054 /* Setup clocks */
1055 sdd->clk = clk_get(&pdev->dev, "spi");
1056 if (IS_ERR(sdd->clk)) {
1057 dev_err(&pdev->dev, "Unable to acquire clock 'spi'\n");
1058 ret = PTR_ERR(sdd->clk);
1059 goto err3;
1060 }
1061
1062 if (clk_enable(sdd->clk)) {
1063 dev_err(&pdev->dev, "Couldn't enable clock 'spi'\n");
1064 ret = -EBUSY;
1065 goto err4;
1066 }
1067
1068 sdd->src_clk = clk_get(&pdev->dev, sci->src_clk_name);
1069 if (IS_ERR(sdd->src_clk)) {
1070 dev_err(&pdev->dev,
1071 "Unable to acquire clock '%s'\n", sci->src_clk_name);
1072 ret = PTR_ERR(sdd->src_clk);
1073 goto err5;
1074 }
1075
1076 if (clk_enable(sdd->src_clk)) {
1077 dev_err(&pdev->dev, "Couldn't enable clock '%s'\n",
1078 sci->src_clk_name);
1079 ret = -EBUSY;
1080 goto err6;
1081 }
1082
1083 sdd->workqueue = create_singlethread_workqueue(
1084 dev_name(master->dev.parent));
1085 if (sdd->workqueue == NULL) {
1086 dev_err(&pdev->dev, "Unable to create workqueue\n");
1087 ret = -ENOMEM;
1088 goto err7;
1089 }
1090
1091 /* Setup Deufult Mode */
1092 s3c64xx_spi_hwinit(sdd, pdev->id);
1093
1094 spin_lock_init(&sdd->lock);
1095 init_completion(&sdd->xfer_completion);
1096 INIT_WORK(&sdd->work, s3c64xx_spi_work);
1097 INIT_LIST_HEAD(&sdd->queue);
1098
1099 if (spi_register_master(master)) {
1100 dev_err(&pdev->dev, "cannot register SPI master\n");
1101 ret = -EBUSY;
1102 goto err8;
1103 }
1104
1105 dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d "
1106 "with %d Slaves attached\n",
1107 pdev->id, master->num_chipselect);
1108 dev_dbg(&pdev->dev, "\tIOmem=[0x%x-0x%x]\tDMA=[Rx-%d, Tx-%d]\n",
1109 mem_res->end, mem_res->start,
1110 sdd->rx_dmach, sdd->tx_dmach);
1111
1112 return 0;
1113
1114 err8:
1115 destroy_workqueue(sdd->workqueue);
1116 err7:
1117 clk_disable(sdd->src_clk);
1118 err6:
1119 clk_put(sdd->src_clk);
1120 err5:
1121 clk_disable(sdd->clk);
1122 err4:
1123 clk_put(sdd->clk);
1124 err3:
1125 err2:
1126 iounmap((void *) sdd->regs);
1127 err1:
1128 release_mem_region(mem_res->start, resource_size(mem_res));
1129 err0:
1130 platform_set_drvdata(pdev, NULL);
1131 spi_master_put(master);
1132
1133 return ret;
1134 }
1135
1136 static int s3c64xx_spi_remove(struct platform_device *pdev)
1137 {
1138 struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
1139 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1140 struct resource *mem_res;
1141 unsigned long flags;
1142
1143 spin_lock_irqsave(&sdd->lock, flags);
1144 sdd->state |= SUSPND;
1145 spin_unlock_irqrestore(&sdd->lock, flags);
1146
1147 while (sdd->state & SPIBUSY)
1148 msleep(10);
1149
1150 spi_unregister_master(master);
1151
1152 destroy_workqueue(sdd->workqueue);
1153
1154 clk_disable(sdd->src_clk);
1155 clk_put(sdd->src_clk);
1156
1157 clk_disable(sdd->clk);
1158 clk_put(sdd->clk);
1159
1160 iounmap((void *) sdd->regs);
1161
1162 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1163 if (mem_res != NULL)
1164 release_mem_region(mem_res->start, resource_size(mem_res));
1165
1166 platform_set_drvdata(pdev, NULL);
1167 spi_master_put(master);
1168
1169 return 0;
1170 }
1171
1172 #ifdef CONFIG_PM
1173 static int s3c64xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
1174 {
1175 struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
1176 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1177 unsigned long flags;
1178
1179 spin_lock_irqsave(&sdd->lock, flags);
1180 sdd->state |= SUSPND;
1181 spin_unlock_irqrestore(&sdd->lock, flags);
1182
1183 while (sdd->state & SPIBUSY)
1184 msleep(10);
1185
1186 /* Disable the clock */
1187 clk_disable(sdd->src_clk);
1188 clk_disable(sdd->clk);
1189
1190 sdd->cur_speed = 0; /* Output Clock is stopped */
1191
1192 return 0;
1193 }
1194
1195 static int s3c64xx_spi_resume(struct platform_device *pdev)
1196 {
1197 struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
1198 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1199 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
1200 unsigned long flags;
1201
1202 sci->cfg_gpio(pdev);
1203
1204 /* Enable the clock */
1205 clk_enable(sdd->src_clk);
1206 clk_enable(sdd->clk);
1207
1208 s3c64xx_spi_hwinit(sdd, pdev->id);
1209
1210 spin_lock_irqsave(&sdd->lock, flags);
1211 sdd->state &= ~SUSPND;
1212 spin_unlock_irqrestore(&sdd->lock, flags);
1213
1214 return 0;
1215 }
1216 #else
1217 #define s3c64xx_spi_suspend NULL
1218 #define s3c64xx_spi_resume NULL
1219 #endif /* CONFIG_PM */
1220
1221 static struct platform_driver s3c64xx_spi_driver = {
1222 .driver = {
1223 .name = "s3c64xx-spi",
1224 .owner = THIS_MODULE,
1225 },
1226 .remove = s3c64xx_spi_remove,
1227 .suspend = s3c64xx_spi_suspend,
1228 .resume = s3c64xx_spi_resume,
1229 };
1230 MODULE_ALIAS("platform:s3c64xx-spi");
1231
1232 static int __init s3c64xx_spi_init(void)
1233 {
1234 return platform_driver_probe(&s3c64xx_spi_driver, s3c64xx_spi_probe);
1235 }
1236 subsys_initcall(s3c64xx_spi_init);
1237
1238 static void __exit s3c64xx_spi_exit(void)
1239 {
1240 platform_driver_unregister(&s3c64xx_spi_driver);
1241 }
1242 module_exit(s3c64xx_spi_exit);
1243
1244 MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
1245 MODULE_DESCRIPTION("S3C64XX SPI Controller Driver");
1246 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree