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Linux 4.16.11
[linux/fpc-iii.git] / drivers / spi / spi-s3c64xx.c
blobbaa3a9fa26387842de1dc33f112799220e491c0c
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
123 struct 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 * @high_speed: True, if the controller supports HIGH_SPEED_EN bit.
134 * @clk_from_cmu: True, if the controller does not include a clock mux and
135 * prescaler unit.
136 *
137 * The Samsung s3c64xx SPI controller are used on various Samsung SoC's but
138 * differ in some aspects such as the size of the fifo and spi bus clock
139 * setup. Such differences are specified to the driver using this structure
140 * which is provided as driver data to the driver.
141 */
142 struct s3c64xx_spi_port_config {
143 int fifo_lvl_mask[MAX_SPI_PORTS];
144 int rx_lvl_offset;
145 int tx_st_done;
146 int quirks;
147 bool high_speed;
148 bool clk_from_cmu;
149 bool clk_ioclk;
150 };
151
152 /**
153 * struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver.
154 * @clk: Pointer to the spi clock.
155 * @src_clk: Pointer to the clock used to generate SPI signals.
156 * @ioclk: Pointer to the i/o clock between master and slave
157 * @master: Pointer to the SPI Protocol master.
158 * @cntrlr_info: Platform specific data for the controller this driver manages.
159 * @tgl_spi: Pointer to the last CS left untoggled by the cs_change hint.
160 * @lock: Controller specific lock.
161 * @state: Set of FLAGS to indicate status.
162 * @rx_dmach: Controller's DMA channel for Rx.
163 * @tx_dmach: Controller's DMA channel for Tx.
164 * @sfr_start: BUS address of SPI controller regs.
165 * @regs: Pointer to ioremap'ed controller registers.
166 * @irq: interrupt
167 * @xfer_completion: To indicate completion of xfer task.
168 * @cur_mode: Stores the active configuration of the controller.
169 * @cur_bpw: Stores the active bits per word settings.
170 * @cur_speed: Stores the active xfer clock speed.
171 */
172 struct s3c64xx_spi_driver_data {
173 void __iomem *regs;
174 struct clk *clk;
175 struct clk *src_clk;
176 struct clk *ioclk;
177 struct platform_device *pdev;
178 struct spi_master *master;
179 struct s3c64xx_spi_info *cntrlr_info;
180 struct spi_device *tgl_spi;
181 spinlock_t lock;
182 unsigned long sfr_start;
183 struct completion xfer_completion;
184 unsigned state;
185 unsigned cur_mode, cur_bpw;
186 unsigned cur_speed;
187 struct s3c64xx_spi_dma_data rx_dma;
188 struct s3c64xx_spi_dma_data tx_dma;
189 struct s3c64xx_spi_port_config *port_conf;
190 unsigned int port_id;
191 };
192
193 static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
194 {
195 void __iomem *regs = sdd->regs;
196 unsigned long loops;
197 u32 val;
198
199 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
200
201 val = readl(regs + S3C64XX_SPI_CH_CFG);
202 val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON);
203 writel(val, regs + S3C64XX_SPI_CH_CFG);
204
205 val = readl(regs + S3C64XX_SPI_CH_CFG);
206 val |= S3C64XX_SPI_CH_SW_RST;
207 val &= ~S3C64XX_SPI_CH_HS_EN;
208 writel(val, regs + S3C64XX_SPI_CH_CFG);
209
210 /* Flush TxFIFO*/
211 loops = msecs_to_loops(1);
212 do {
213 val = readl(regs + S3C64XX_SPI_STATUS);
214 } while (TX_FIFO_LVL(val, sdd) && loops--);
215
216 if (loops == 0)
217 dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n");
218
219 /* Flush RxFIFO*/
220 loops = msecs_to_loops(1);
221 do {
222 val = readl(regs + S3C64XX_SPI_STATUS);
223 if (RX_FIFO_LVL(val, sdd))
224 readl(regs + S3C64XX_SPI_RX_DATA);
225 else
226 break;
227 } while (loops--);
228
229 if (loops == 0)
230 dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n");
231
232 val = readl(regs + S3C64XX_SPI_CH_CFG);
233 val &= ~S3C64XX_SPI_CH_SW_RST;
234 writel(val, regs + S3C64XX_SPI_CH_CFG);
235
236 val = readl(regs + S3C64XX_SPI_MODE_CFG);
237 val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
238 writel(val, regs + S3C64XX_SPI_MODE_CFG);
239 }
240
241 static void s3c64xx_spi_dmacb(void *data)
242 {
243 struct s3c64xx_spi_driver_data *sdd;
244 struct s3c64xx_spi_dma_data *dma = data;
245 unsigned long flags;
246
247 if (dma->direction == DMA_DEV_TO_MEM)
248 sdd = container_of(data,
249 struct s3c64xx_spi_driver_data, rx_dma);
250 else
251 sdd = container_of(data,
252 struct s3c64xx_spi_driver_data, tx_dma);
253
254 spin_lock_irqsave(&sdd->lock, flags);
255
256 if (dma->direction == DMA_DEV_TO_MEM) {
257 sdd->state &= ~RXBUSY;
258 if (!(sdd->state & TXBUSY))
259 complete(&sdd->xfer_completion);
260 } else {
261 sdd->state &= ~TXBUSY;
262 if (!(sdd->state & RXBUSY))
263 complete(&sdd->xfer_completion);
264 }
265
266 spin_unlock_irqrestore(&sdd->lock, flags);
267 }
268
269 static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
270 struct sg_table *sgt)
271 {
272 struct s3c64xx_spi_driver_data *sdd;
273 struct dma_slave_config config;
274 struct dma_async_tx_descriptor *desc;
275
276 memset(&config, 0, sizeof(config));
277
278 if (dma->direction == DMA_DEV_TO_MEM) {
279 sdd = container_of((void *)dma,
280 struct s3c64xx_spi_driver_data, rx_dma);
281 config.direction = dma->direction;
282 config.src_addr = sdd->sfr_start + S3C64XX_SPI_RX_DATA;
283 config.src_addr_width = sdd->cur_bpw / 8;
284 config.src_maxburst = 1;
285 dmaengine_slave_config(dma->ch, &config);
286 } else {
287 sdd = container_of((void *)dma,
288 struct s3c64xx_spi_driver_data, tx_dma);
289 config.direction = dma->direction;
290 config.dst_addr = sdd->sfr_start + S3C64XX_SPI_TX_DATA;
291 config.dst_addr_width = sdd->cur_bpw / 8;
292 config.dst_maxburst = 1;
293 dmaengine_slave_config(dma->ch, &config);
294 }
295
296 desc = dmaengine_prep_slave_sg(dma->ch, sgt->sgl, sgt->nents,
297 dma->direction, DMA_PREP_INTERRUPT);
298
299 desc->callback = s3c64xx_spi_dmacb;
300 desc->callback_param = dma;
301
302 dmaengine_submit(desc);
303 dma_async_issue_pending(dma->ch);
304 }
305
306 static void s3c64xx_spi_set_cs(struct spi_device *spi, bool enable)
307 {
308 struct s3c64xx_spi_driver_data *sdd =
309 spi_master_get_devdata(spi->master);
310
311 if (sdd->cntrlr_info->no_cs)
312 return;
313
314 if (enable) {
315 if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO)) {
316 writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
317 } else {
318 u32 ssel = readl(sdd->regs + S3C64XX_SPI_SLAVE_SEL);
319
320 ssel |= (S3C64XX_SPI_SLAVE_AUTO |
321 S3C64XX_SPI_SLAVE_NSC_CNT_2);
322 writel(ssel, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
323 }
324 } else {
325 if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
326 writel(S3C64XX_SPI_SLAVE_SIG_INACT,
327 sdd->regs + S3C64XX_SPI_SLAVE_SEL);
328 }
329 }
330
331 static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
332 {
333 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
334
335 if (is_polling(sdd))
336 return 0;
337
338 spi->dma_rx = sdd->rx_dma.ch;
339 spi->dma_tx = sdd->tx_dma.ch;
340
341 return 0;
342 }
343
344 static bool s3c64xx_spi_can_dma(struct spi_master *master,
345 struct spi_device *spi,
346 struct spi_transfer *xfer)
347 {
348 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
349
350 return xfer->len > (FIFO_LVL_MASK(sdd) >> 1) + 1;
351 }
352
353 static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
354 struct spi_device *spi,
355 struct spi_transfer *xfer, int dma_mode)
356 {
357 void __iomem *regs = sdd->regs;
358 u32 modecfg, chcfg;
359
360 modecfg = readl(regs + S3C64XX_SPI_MODE_CFG);
361 modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
362
363 chcfg = readl(regs + S3C64XX_SPI_CH_CFG);
364 chcfg &= ~S3C64XX_SPI_CH_TXCH_ON;
365
366 if (dma_mode) {
367 chcfg &= ~S3C64XX_SPI_CH_RXCH_ON;
368 } else {
369 /* Always shift in data in FIFO, even if xfer is Tx only,
370 * this helps setting PCKT_CNT value for generating clocks
371 * as exactly needed.
372 */
373 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
374 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
375 | S3C64XX_SPI_PACKET_CNT_EN,
376 regs + S3C64XX_SPI_PACKET_CNT);
377 }
378
379 if (xfer->tx_buf != NULL) {
380 sdd->state |= TXBUSY;
381 chcfg |= S3C64XX_SPI_CH_TXCH_ON;
382 if (dma_mode) {
383 modecfg |= S3C64XX_SPI_MODE_TXDMA_ON;
384 prepare_dma(&sdd->tx_dma, &xfer->tx_sg);
385 } else {
386 switch (sdd->cur_bpw) {
387 case 32:
388 iowrite32_rep(regs + S3C64XX_SPI_TX_DATA,
389 xfer->tx_buf, xfer->len / 4);
390 break;
391 case 16:
392 iowrite16_rep(regs + S3C64XX_SPI_TX_DATA,
393 xfer->tx_buf, xfer->len / 2);
394 break;
395 default:
396 iowrite8_rep(regs + S3C64XX_SPI_TX_DATA,
397 xfer->tx_buf, xfer->len);
398 break;
399 }
400 }
401 }
402
403 if (xfer->rx_buf != NULL) {
404 sdd->state |= RXBUSY;
405
406 if (sdd->port_conf->high_speed && sdd->cur_speed >= 30000000UL
407 && !(sdd->cur_mode & SPI_CPHA))
408 chcfg |= S3C64XX_SPI_CH_HS_EN;
409
410 if (dma_mode) {
411 modecfg |= S3C64XX_SPI_MODE_RXDMA_ON;
412 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
413 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
414 | S3C64XX_SPI_PACKET_CNT_EN,
415 regs + S3C64XX_SPI_PACKET_CNT);
416 prepare_dma(&sdd->rx_dma, &xfer->rx_sg);
417 }
418 }
419
420 writel(modecfg, regs + S3C64XX_SPI_MODE_CFG);
421 writel(chcfg, regs + S3C64XX_SPI_CH_CFG);
422 }
423
424 static u32 s3c64xx_spi_wait_for_timeout(struct s3c64xx_spi_driver_data *sdd,
425 int timeout_ms)
426 {
427 void __iomem *regs = sdd->regs;
428 unsigned long val = 1;
429 u32 status;
430
431 /* max fifo depth available */
432 u32 max_fifo = (FIFO_LVL_MASK(sdd) >> 1) + 1;
433
434 if (timeout_ms)
435 val = msecs_to_loops(timeout_ms);
436
437 do {
438 status = readl(regs + S3C64XX_SPI_STATUS);
439 } while (RX_FIFO_LVL(status, sdd) < max_fifo && --val);
440
441 /* return the actual received data length */
442 return RX_FIFO_LVL(status, sdd);
443 }
444
445 static int wait_for_dma(struct s3c64xx_spi_driver_data *sdd,
446 struct spi_transfer *xfer)
447 {
448 void __iomem *regs = sdd->regs;
449 unsigned long val;
450 u32 status;
451 int ms;
452
453 /* millisecs to xfer 'len' bytes @ 'cur_speed' */
454 ms = xfer->len * 8 * 1000 / sdd->cur_speed;
455 ms += 10; /* some tolerance */
456
457 val = msecs_to_jiffies(ms) + 10;
458 val = wait_for_completion_timeout(&sdd->xfer_completion, val);
459
460 /*
461 * If the previous xfer was completed within timeout, then
462 * proceed further else return -EIO.
463 * DmaTx returns after simply writing data in the FIFO,
464 * w/o waiting for real transmission on the bus to finish.
465 * DmaRx returns only after Dma read data from FIFO which
466 * needs bus transmission to finish, so we don't worry if
467 * Xfer involved Rx(with or without Tx).
468 */
469 if (val && !xfer->rx_buf) {
470 val = msecs_to_loops(10);
471 status = readl(regs + S3C64XX_SPI_STATUS);
472 while ((TX_FIFO_LVL(status, sdd)
473 || !S3C64XX_SPI_ST_TX_DONE(status, sdd))
474 && --val) {
475 cpu_relax();
476 status = readl(regs + S3C64XX_SPI_STATUS);
477 }
478
479 }
480
481 /* If timed out while checking rx/tx status return error */
482 if (!val)
483 return -EIO;
484
485 return 0;
486 }
487
488 static int wait_for_pio(struct s3c64xx_spi_driver_data *sdd,
489 struct spi_transfer *xfer)
490 {
491 void __iomem *regs = sdd->regs;
492 unsigned long val;
493 u32 status;
494 int loops;
495 u32 cpy_len;
496 u8 *buf;
497 int ms;
498
499 /* millisecs to xfer 'len' bytes @ 'cur_speed' */
500 ms = xfer->len * 8 * 1000 / sdd->cur_speed;
501 ms += 10; /* some tolerance */
502
503 val = msecs_to_loops(ms);
504 do {
505 status = readl(regs + S3C64XX_SPI_STATUS);
506 } while (RX_FIFO_LVL(status, sdd) < xfer->len && --val);
507
508
509 /* If it was only Tx */
510 if (!xfer->rx_buf) {
511 sdd->state &= ~TXBUSY;
512 return 0;
513 }
514
515 /*
516 * If the receive length is bigger than the controller fifo
517 * size, calculate the loops and read the fifo as many times.
518 * loops = length / max fifo size (calculated by using the
519 * fifo mask).
520 * For any size less than the fifo size the below code is
521 * executed atleast once.
522 */
523 loops = xfer->len / ((FIFO_LVL_MASK(sdd) >> 1) + 1);
524 buf = xfer->rx_buf;
525 do {
526 /* wait for data to be received in the fifo */
527 cpy_len = s3c64xx_spi_wait_for_timeout(sdd,
528 (loops ? ms : 0));
529
530 switch (sdd->cur_bpw) {
531 case 32:
532 ioread32_rep(regs + S3C64XX_SPI_RX_DATA,
533 buf, cpy_len / 4);
534 break;
535 case 16:
536 ioread16_rep(regs + S3C64XX_SPI_RX_DATA,
537 buf, cpy_len / 2);
538 break;
539 default:
540 ioread8_rep(regs + S3C64XX_SPI_RX_DATA,
541 buf, cpy_len);
542 break;
543 }
544
545 buf = buf + cpy_len;
546 } while (loops--);
547 sdd->state &= ~RXBUSY;
548
549 return 0;
550 }
551
552 static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
553 {
554 void __iomem *regs = sdd->regs;
555 u32 val;
556
557 /* Disable Clock */
558 if (!sdd->port_conf->clk_from_cmu) {
559 val = readl(regs + S3C64XX_SPI_CLK_CFG);
560 val &= ~S3C64XX_SPI_ENCLK_ENABLE;
561 writel(val, regs + S3C64XX_SPI_CLK_CFG);
562 }
563
564 /* Set Polarity and Phase */
565 val = readl(regs + S3C64XX_SPI_CH_CFG);
566 val &= ~(S3C64XX_SPI_CH_SLAVE |
567 S3C64XX_SPI_CPOL_L |
568 S3C64XX_SPI_CPHA_B);
569
570 if (sdd->cur_mode & SPI_CPOL)
571 val |= S3C64XX_SPI_CPOL_L;
572
573 if (sdd->cur_mode & SPI_CPHA)
574 val |= S3C64XX_SPI_CPHA_B;
575
576 writel(val, regs + S3C64XX_SPI_CH_CFG);
577
578 /* Set Channel & DMA Mode */
579 val = readl(regs + S3C64XX_SPI_MODE_CFG);
580 val &= ~(S3C64XX_SPI_MODE_BUS_TSZ_MASK
581 | S3C64XX_SPI_MODE_CH_TSZ_MASK);
582
583 switch (sdd->cur_bpw) {
584 case 32:
585 val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD;
586 val |= S3C64XX_SPI_MODE_CH_TSZ_WORD;
587 break;
588 case 16:
589 val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD;
590 val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD;
591 break;
592 default:
593 val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE;
594 val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE;
595 break;
596 }
597
598 writel(val, regs + S3C64XX_SPI_MODE_CFG);
599
600 if (sdd->port_conf->clk_from_cmu) {
601 /* The src_clk clock is divided internally by 2 */
602 clk_set_rate(sdd->src_clk, sdd->cur_speed * 2);
603 } else {
604 /* Configure Clock */
605 val = readl(regs + S3C64XX_SPI_CLK_CFG);
606 val &= ~S3C64XX_SPI_PSR_MASK;
607 val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1)
608 & S3C64XX_SPI_PSR_MASK);
609 writel(val, regs + S3C64XX_SPI_CLK_CFG);
610
611 /* Enable Clock */
612 val = readl(regs + S3C64XX_SPI_CLK_CFG);
613 val |= S3C64XX_SPI_ENCLK_ENABLE;
614 writel(val, regs + S3C64XX_SPI_CLK_CFG);
615 }
616 }
617
618 #define XFER_DMAADDR_INVALID DMA_BIT_MASK(32)
619
620 static int s3c64xx_spi_prepare_message(struct spi_master *master,
621 struct spi_message *msg)
622 {
623 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
624 struct spi_device *spi = msg->spi;
625 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
626
627 /* Configure feedback delay */
628 writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK);
629
630 return 0;
631 }
632
633 static int s3c64xx_spi_transfer_one(struct spi_master *master,
634 struct spi_device *spi,
635 struct spi_transfer *xfer)
636 {
637 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
638 int status;
639 u32 speed;
640 u8 bpw;
641 unsigned long flags;
642 int use_dma;
643
644 reinit_completion(&sdd->xfer_completion);
645
646 /* Only BPW and Speed may change across transfers */
647 bpw = xfer->bits_per_word;
648 speed = xfer->speed_hz;
649
650 if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) {
651 sdd->cur_bpw = bpw;
652 sdd->cur_speed = speed;
653 sdd->cur_mode = spi->mode;
654 s3c64xx_spi_config(sdd);
655 }
656
657 /* Polling method for xfers not bigger than FIFO capacity */
658 use_dma = 0;
659 if (!is_polling(sdd) &&
660 (sdd->rx_dma.ch && sdd->tx_dma.ch &&
661 (xfer->len > ((FIFO_LVL_MASK(sdd) >> 1) + 1))))
662 use_dma = 1;
663
664 spin_lock_irqsave(&sdd->lock, flags);
665
666 /* Pending only which is to be done */
667 sdd->state &= ~RXBUSY;
668 sdd->state &= ~TXBUSY;
669
670 enable_datapath(sdd, spi, xfer, use_dma);
671
672 /* Start the signals */
673 s3c64xx_spi_set_cs(spi, true);
674
675 spin_unlock_irqrestore(&sdd->lock, flags);
676
677 if (use_dma)
678 status = wait_for_dma(sdd, xfer);
679 else
680 status = wait_for_pio(sdd, xfer);
681
682 if (status) {
683 dev_err(&spi->dev, "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n",
684 xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
685 (sdd->state & RXBUSY) ? 'f' : 'p',
686 (sdd->state & TXBUSY) ? 'f' : 'p',
687 xfer->len);
688
689 if (use_dma) {
690 if (xfer->tx_buf != NULL
691 && (sdd->state & TXBUSY))
692 dmaengine_terminate_all(sdd->tx_dma.ch);
693 if (xfer->rx_buf != NULL
694 && (sdd->state & RXBUSY))
695 dmaengine_terminate_all(sdd->rx_dma.ch);
696 }
697 } else {
698 flush_fifo(sdd);
699 }
700
701 return status;
702 }
703
704 static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
705 struct spi_device *spi)
706 {
707 struct s3c64xx_spi_csinfo *cs;
708 struct device_node *slave_np, *data_np = NULL;
709 u32 fb_delay = 0;
710
711 slave_np = spi->dev.of_node;
712 if (!slave_np) {
713 dev_err(&spi->dev, "device node not found\n");
714 return ERR_PTR(-EINVAL);
715 }
716
717 data_np = of_get_child_by_name(slave_np, "controller-data");
718 if (!data_np) {
719 dev_err(&spi->dev, "child node 'controller-data' not found\n");
720 return ERR_PTR(-EINVAL);
721 }
722
723 cs = kzalloc(sizeof(*cs), GFP_KERNEL);
724 if (!cs) {
725 of_node_put(data_np);
726 return ERR_PTR(-ENOMEM);
727 }
728
729 of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay);
730 cs->fb_delay = fb_delay;
731 of_node_put(data_np);
732 return cs;
733 }
734
735 /*
736 * Here we only check the validity of requested configuration
737 * and save the configuration in a local data-structure.
738 * The controller is actually configured only just before we
739 * get a message to transfer.
740 */
741 static int s3c64xx_spi_setup(struct spi_device *spi)
742 {
743 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
744 struct s3c64xx_spi_driver_data *sdd;
745 int err;
746
747 sdd = spi_master_get_devdata(spi->master);
748 if (spi->dev.of_node) {
749 cs = s3c64xx_get_slave_ctrldata(spi);
750 spi->controller_data = cs;
751 } else if (cs) {
752 /* On non-DT platforms the SPI core will set spi->cs_gpio
753 * to -ENOENT. The GPIO pin used to drive the chip select
754 * is defined by using platform data so spi->cs_gpio value
755 * has to be override to have the proper GPIO pin number.
756 */
757 spi->cs_gpio = cs->line;
758 }
759
760 if (IS_ERR_OR_NULL(cs)) {
761 dev_err(&spi->dev, "No CS for SPI(%d)\n", spi->chip_select);
762 return -ENODEV;
763 }
764
765 if (!spi_get_ctldata(spi)) {
766 if (gpio_is_valid(spi->cs_gpio)) {
767 err = gpio_request_one(spi->cs_gpio, GPIOF_OUT_INIT_HIGH,
768 dev_name(&spi->dev));
769 if (err) {
770 dev_err(&spi->dev,
771 "Failed to get /CS gpio [%d]: %d\n",
772 spi->cs_gpio, err);
773 goto err_gpio_req;
774 }
775 }
776
777 spi_set_ctldata(spi, cs);
778 }
779
780 pm_runtime_get_sync(&sdd->pdev->dev);
781
782 /* Check if we can provide the requested rate */
783 if (!sdd->port_conf->clk_from_cmu) {
784 u32 psr, speed;
785
786 /* Max possible */
787 speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1);
788
789 if (spi->max_speed_hz > speed)
790 spi->max_speed_hz = speed;
791
792 psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1;
793 psr &= S3C64XX_SPI_PSR_MASK;
794 if (psr == S3C64XX_SPI_PSR_MASK)
795 psr--;
796
797 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
798 if (spi->max_speed_hz < speed) {
799 if (psr+1 < S3C64XX_SPI_PSR_MASK) {
800 psr++;
801 } else {
802 err = -EINVAL;
803 goto setup_exit;
804 }
805 }
806
807 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
808 if (spi->max_speed_hz >= speed) {
809 spi->max_speed_hz = speed;
810 } else {
811 dev_err(&spi->dev, "Can't set %dHz transfer speed\n",
812 spi->max_speed_hz);
813 err = -EINVAL;
814 goto setup_exit;
815 }
816 }
817
818 pm_runtime_mark_last_busy(&sdd->pdev->dev);
819 pm_runtime_put_autosuspend(&sdd->pdev->dev);
820 s3c64xx_spi_set_cs(spi, false);
821
822 return 0;
823
824 setup_exit:
825 pm_runtime_mark_last_busy(&sdd->pdev->dev);
826 pm_runtime_put_autosuspend(&sdd->pdev->dev);
827 /* setup() returns with device de-selected */
828 s3c64xx_spi_set_cs(spi, false);
829
830 if (gpio_is_valid(spi->cs_gpio))
831 gpio_free(spi->cs_gpio);
832 spi_set_ctldata(spi, NULL);
833
834 err_gpio_req:
835 if (spi->dev.of_node)
836 kfree(cs);
837
838 return err;
839 }
840
841 static void s3c64xx_spi_cleanup(struct spi_device *spi)
842 {
843 struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi);
844
845 if (gpio_is_valid(spi->cs_gpio)) {
846 gpio_free(spi->cs_gpio);
847 if (spi->dev.of_node)
848 kfree(cs);
849 else {
850 /* On non-DT platforms, the SPI core sets
851 * spi->cs_gpio to -ENOENT and .setup()
852 * overrides it with the GPIO pin value
853 * passed using platform data.
854 */
855 spi->cs_gpio = -ENOENT;
856 }
857 }
858
859 spi_set_ctldata(spi, NULL);
860 }
861
862 static irqreturn_t s3c64xx_spi_irq(int irq, void *data)
863 {
864 struct s3c64xx_spi_driver_data *sdd = data;
865 struct spi_master *spi = sdd->master;
866 unsigned int val, clr = 0;
867
868 val = readl(sdd->regs + S3C64XX_SPI_STATUS);
869
870 if (val & S3C64XX_SPI_ST_RX_OVERRUN_ERR) {
871 clr = S3C64XX_SPI_PND_RX_OVERRUN_CLR;
872 dev_err(&spi->dev, "RX overrun\n");
873 }
874 if (val & S3C64XX_SPI_ST_RX_UNDERRUN_ERR) {
875 clr |= S3C64XX_SPI_PND_RX_UNDERRUN_CLR;
876 dev_err(&spi->dev, "RX underrun\n");
877 }
878 if (val & S3C64XX_SPI_ST_TX_OVERRUN_ERR) {
879 clr |= S3C64XX_SPI_PND_TX_OVERRUN_CLR;
880 dev_err(&spi->dev, "TX overrun\n");
881 }
882 if (val & S3C64XX_SPI_ST_TX_UNDERRUN_ERR) {
883 clr |= S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
884 dev_err(&spi->dev, "TX underrun\n");
885 }
886
887 /* Clear the pending irq by setting and then clearing it */
888 writel(clr, sdd->regs + S3C64XX_SPI_PENDING_CLR);
889 writel(0, sdd->regs + S3C64XX_SPI_PENDING_CLR);
890
891 return IRQ_HANDLED;
892 }
893
894 static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel)
895 {
896 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
897 void __iomem *regs = sdd->regs;
898 unsigned int val;
899
900 sdd->cur_speed = 0;
901
902 if (sci->no_cs)
903 writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
904 else if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
905 writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
906
907 /* Disable Interrupts - we use Polling if not DMA mode */
908 writel(0, regs + S3C64XX_SPI_INT_EN);
909
910 if (!sdd->port_conf->clk_from_cmu)
911 writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT,
912 regs + S3C64XX_SPI_CLK_CFG);
913 writel(0, regs + S3C64XX_SPI_MODE_CFG);
914 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
915
916 /* Clear any irq pending bits, should set and clear the bits */
917 val = S3C64XX_SPI_PND_RX_OVERRUN_CLR |
918 S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
919 S3C64XX_SPI_PND_TX_OVERRUN_CLR |
920 S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
921 writel(val, regs + S3C64XX_SPI_PENDING_CLR);
922 writel(0, regs + S3C64XX_SPI_PENDING_CLR);
923
924 writel(0, regs + S3C64XX_SPI_SWAP_CFG);
925
926 val = readl(regs + S3C64XX_SPI_MODE_CFG);
927 val &= ~S3C64XX_SPI_MODE_4BURST;
928 val &= ~(S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
929 val |= (S3C64XX_SPI_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
930 writel(val, regs + S3C64XX_SPI_MODE_CFG);
931
932 flush_fifo(sdd);
933 }
934
935 #ifdef CONFIG_OF
936 static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev)
937 {
938 struct s3c64xx_spi_info *sci;
939 u32 temp;
940
941 sci = devm_kzalloc(dev, sizeof(*sci), GFP_KERNEL);
942 if (!sci)
943 return ERR_PTR(-ENOMEM);
944
945 if (of_property_read_u32(dev->of_node, "samsung,spi-src-clk", &temp)) {
946 dev_warn(dev, "spi bus clock parent not specified, using clock at index 0 as parent\n");
947 sci->src_clk_nr = 0;
948 } else {
949 sci->src_clk_nr = temp;
950 }
951
952 if (of_property_read_u32(dev->of_node, "num-cs", &temp)) {
953 dev_warn(dev, "number of chip select lines not specified, assuming 1 chip select line\n");
954 sci->num_cs = 1;
955 } else {
956 sci->num_cs = temp;
957 }
958
959 sci->no_cs = of_property_read_bool(dev->of_node, "no-cs-readback");
960
961 return sci;
962 }
963 #else
964 static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev)
965 {
966 return dev_get_platdata(dev);
967 }
968 #endif
969
970 static const struct of_device_id s3c64xx_spi_dt_match[];
971
972 static inline struct s3c64xx_spi_port_config *s3c64xx_spi_get_port_config(
973 struct platform_device *pdev)
974 {
975 #ifdef CONFIG_OF
976 if (pdev->dev.of_node) {
977 const struct of_device_id *match;
978 match = of_match_node(s3c64xx_spi_dt_match, pdev->dev.of_node);
979 return (struct s3c64xx_spi_port_config *)match->data;
980 }
981 #endif
982 return (struct s3c64xx_spi_port_config *)
983 platform_get_device_id(pdev)->driver_data;
984 }
985
986 static int s3c64xx_spi_probe(struct platform_device *pdev)
987 {
988 struct resource *mem_res;
989 struct s3c64xx_spi_driver_data *sdd;
990 struct s3c64xx_spi_info *sci = dev_get_platdata(&pdev->dev);
991 struct spi_master *master;
992 int ret, irq;
993 char clk_name[16];
994
995 if (!sci && pdev->dev.of_node) {
996 sci = s3c64xx_spi_parse_dt(&pdev->dev);
997 if (IS_ERR(sci))
998 return PTR_ERR(sci);
999 }
1000
1001 if (!sci) {
1002 dev_err(&pdev->dev, "platform_data missing!\n");
1003 return -ENODEV;
1004 }
1005
1006 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1007 if (mem_res == NULL) {
1008 dev_err(&pdev->dev, "Unable to get SPI MEM resource\n");
1009 return -ENXIO;
1010 }
1011
1012 irq = platform_get_irq(pdev, 0);
1013 if (irq < 0) {
1014 dev_warn(&pdev->dev, "Failed to get IRQ: %d\n", irq);
1015 return irq;
1016 }
1017
1018 master = spi_alloc_master(&pdev->dev,
1019 sizeof(struct s3c64xx_spi_driver_data));
1020 if (master == NULL) {
1021 dev_err(&pdev->dev, "Unable to allocate SPI Master\n");
1022 return -ENOMEM;
1023 }
1024
1025 platform_set_drvdata(pdev, master);
1026
1027 sdd = spi_master_get_devdata(master);
1028 sdd->port_conf = s3c64xx_spi_get_port_config(pdev);
1029 sdd->master = master;
1030 sdd->cntrlr_info = sci;
1031 sdd->pdev = pdev;
1032 sdd->sfr_start = mem_res->start;
1033 if (pdev->dev.of_node) {
1034 ret = of_alias_get_id(pdev->dev.of_node, "spi");
1035 if (ret < 0) {
1036 dev_err(&pdev->dev, "failed to get alias id, errno %d\n",
1037 ret);
1038 goto err_deref_master;
1039 }
1040 sdd->port_id = ret;
1041 } else {
1042 sdd->port_id = pdev->id;
1043 }
1044
1045 sdd->cur_bpw = 8;
1046
1047 sdd->tx_dma.direction = DMA_MEM_TO_DEV;
1048 sdd->rx_dma.direction = DMA_DEV_TO_MEM;
1049
1050 master->dev.of_node = pdev->dev.of_node;
1051 master->bus_num = sdd->port_id;
1052 master->setup = s3c64xx_spi_setup;
1053 master->cleanup = s3c64xx_spi_cleanup;
1054 master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer;
1055 master->prepare_message = s3c64xx_spi_prepare_message;
1056 master->transfer_one = s3c64xx_spi_transfer_one;
1057 master->num_chipselect = sci->num_cs;
1058 master->dma_alignment = 8;
1059 master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) |
1060 SPI_BPW_MASK(8);
1061 /* the spi->mode bits understood by this driver: */
1062 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1063 master->auto_runtime_pm = true;
1064 if (!is_polling(sdd))
1065 master->can_dma = s3c64xx_spi_can_dma;
1066
1067 sdd->regs = devm_ioremap_resource(&pdev->dev, mem_res);
1068 if (IS_ERR(sdd->regs)) {
1069 ret = PTR_ERR(sdd->regs);
1070 goto err_deref_master;
1071 }
1072
1073 if (sci->cfg_gpio && sci->cfg_gpio()) {
1074 dev_err(&pdev->dev, "Unable to config gpio\n");
1075 ret = -EBUSY;
1076 goto err_deref_master;
1077 }
1078
1079 /* Setup clocks */
1080 sdd->clk = devm_clk_get(&pdev->dev, "spi");
1081 if (IS_ERR(sdd->clk)) {
1082 dev_err(&pdev->dev, "Unable to acquire clock 'spi'\n");
1083 ret = PTR_ERR(sdd->clk);
1084 goto err_deref_master;
1085 }
1086
1087 ret = clk_prepare_enable(sdd->clk);
1088 if (ret) {
1089 dev_err(&pdev->dev, "Couldn't enable clock 'spi'\n");
1090 goto err_deref_master;
1091 }
1092
1093 sprintf(clk_name, "spi_busclk%d", sci->src_clk_nr);
1094 sdd->src_clk = devm_clk_get(&pdev->dev, clk_name);
1095 if (IS_ERR(sdd->src_clk)) {
1096 dev_err(&pdev->dev,
1097 "Unable to acquire clock '%s'\n", clk_name);
1098 ret = PTR_ERR(sdd->src_clk);
1099 goto err_disable_clk;
1100 }
1101
1102 ret = clk_prepare_enable(sdd->src_clk);
1103 if (ret) {
1104 dev_err(&pdev->dev, "Couldn't enable clock '%s'\n", clk_name);
1105 goto err_disable_clk;
1106 }
1107
1108 if (sdd->port_conf->clk_ioclk) {
1109 sdd->ioclk = devm_clk_get(&pdev->dev, "spi_ioclk");
1110 if (IS_ERR(sdd->ioclk)) {
1111 dev_err(&pdev->dev, "Unable to acquire 'ioclk'\n");
1112 ret = PTR_ERR(sdd->ioclk);
1113 goto err_disable_src_clk;
1114 }
1115
1116 ret = clk_prepare_enable(sdd->ioclk);
1117 if (ret) {
1118 dev_err(&pdev->dev, "Couldn't enable clock 'ioclk'\n");
1119 goto err_disable_src_clk;
1120 }
1121 }
1122
1123 if (!is_polling(sdd)) {
1124 /* Acquire DMA channels */
1125 sdd->rx_dma.ch = dma_request_slave_channel_reason(&pdev->dev,
1126 "rx");
1127 if (IS_ERR(sdd->rx_dma.ch)) {
1128 dev_err(&pdev->dev, "Failed to get RX DMA channel\n");
1129 ret = PTR_ERR(sdd->rx_dma.ch);
1130 goto err_disable_io_clk;
1131 }
1132 sdd->tx_dma.ch = dma_request_slave_channel_reason(&pdev->dev,
1133 "tx");
1134 if (IS_ERR(sdd->tx_dma.ch)) {
1135 dev_err(&pdev->dev, "Failed to get TX DMA channel\n");
1136 ret = PTR_ERR(sdd->tx_dma.ch);
1137 goto err_release_rx_dma;
1138 }
1139 }
1140
1141 pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
1142 pm_runtime_use_autosuspend(&pdev->dev);
1143 pm_runtime_set_active(&pdev->dev);
1144 pm_runtime_enable(&pdev->dev);
1145 pm_runtime_get_sync(&pdev->dev);
1146
1147 /* Setup Deufult Mode */
1148 s3c64xx_spi_hwinit(sdd, sdd->port_id);
1149
1150 spin_lock_init(&sdd->lock);
1151 init_completion(&sdd->xfer_completion);
1152
1153 ret = devm_request_irq(&pdev->dev, irq, s3c64xx_spi_irq, 0,
1154 "spi-s3c64xx", sdd);
1155 if (ret != 0) {
1156 dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n",
1157 irq, ret);
1158 goto err_pm_put;
1159 }
1160
1161 writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN |
1162 S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
1163 sdd->regs + S3C64XX_SPI_INT_EN);
1164
1165 ret = devm_spi_register_master(&pdev->dev, master);
1166 if (ret != 0) {
1167 dev_err(&pdev->dev, "cannot register SPI master: %d\n", ret);
1168 goto err_pm_put;
1169 }
1170
1171 dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Slaves attached\n",
1172 sdd->port_id, master->num_chipselect);
1173 dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tFIFO %dbytes\n",
1174 mem_res, (FIFO_LVL_MASK(sdd) >> 1) + 1);
1175
1176 pm_runtime_mark_last_busy(&pdev->dev);
1177 pm_runtime_put_autosuspend(&pdev->dev);
1178
1179 return 0;
1180
1181 err_pm_put:
1182 pm_runtime_put_noidle(&pdev->dev);
1183 pm_runtime_disable(&pdev->dev);
1184 pm_runtime_set_suspended(&pdev->dev);
1185
1186 if (!is_polling(sdd))
1187 dma_release_channel(sdd->tx_dma.ch);
1188 err_release_rx_dma:
1189 if (!is_polling(sdd))
1190 dma_release_channel(sdd->rx_dma.ch);
1191 err_disable_io_clk:
1192 clk_disable_unprepare(sdd->ioclk);
1193 err_disable_src_clk:
1194 clk_disable_unprepare(sdd->src_clk);
1195 err_disable_clk:
1196 clk_disable_unprepare(sdd->clk);
1197 err_deref_master:
1198 spi_master_put(master);
1199
1200 return ret;
1201 }
1202
1203 static int s3c64xx_spi_remove(struct platform_device *pdev)
1204 {
1205 struct spi_master *master = platform_get_drvdata(pdev);
1206 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1207
1208 pm_runtime_get_sync(&pdev->dev);
1209
1210 writel(0, sdd->regs + S3C64XX_SPI_INT_EN);
1211
1212 if (!is_polling(sdd)) {
1213 dma_release_channel(sdd->rx_dma.ch);
1214 dma_release_channel(sdd->tx_dma.ch);
1215 }
1216
1217 clk_disable_unprepare(sdd->ioclk);
1218
1219 clk_disable_unprepare(sdd->src_clk);
1220
1221 clk_disable_unprepare(sdd->clk);
1222
1223 pm_runtime_put_noidle(&pdev->dev);
1224 pm_runtime_disable(&pdev->dev);
1225 pm_runtime_set_suspended(&pdev->dev);
1226
1227 return 0;
1228 }
1229
1230 #ifdef CONFIG_PM_SLEEP
1231 static int s3c64xx_spi_suspend(struct device *dev)
1232 {
1233 struct spi_master *master = dev_get_drvdata(dev);
1234 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1235
1236 int ret = spi_master_suspend(master);
1237 if (ret)
1238 return ret;
1239
1240 ret = pm_runtime_force_suspend(dev);
1241 if (ret < 0)
1242 return ret;
1243
1244 sdd->cur_speed = 0; /* Output Clock is stopped */
1245
1246 return 0;
1247 }
1248
1249 static int s3c64xx_spi_resume(struct device *dev)
1250 {
1251 struct spi_master *master = dev_get_drvdata(dev);
1252 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1253 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
1254 int ret;
1255
1256 if (sci->cfg_gpio)
1257 sci->cfg_gpio();
1258
1259 ret = pm_runtime_force_resume(dev);
1260 if (ret < 0)
1261 return ret;
1262
1263 s3c64xx_spi_hwinit(sdd, sdd->port_id);
1264
1265 return spi_master_resume(master);
1266 }
1267 #endif /* CONFIG_PM_SLEEP */
1268
1269 #ifdef CONFIG_PM
1270 static int s3c64xx_spi_runtime_suspend(struct device *dev)
1271 {
1272 struct spi_master *master = dev_get_drvdata(dev);
1273 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1274
1275 clk_disable_unprepare(sdd->clk);
1276 clk_disable_unprepare(sdd->src_clk);
1277 clk_disable_unprepare(sdd->ioclk);
1278
1279 return 0;
1280 }
1281
1282 static int s3c64xx_spi_runtime_resume(struct device *dev)
1283 {
1284 struct spi_master *master = dev_get_drvdata(dev);
1285 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1286 int ret;
1287
1288 if (sdd->port_conf->clk_ioclk) {
1289 ret = clk_prepare_enable(sdd->ioclk);
1290 if (ret != 0)
1291 return ret;
1292 }
1293
1294 ret = clk_prepare_enable(sdd->src_clk);
1295 if (ret != 0)
1296 goto err_disable_ioclk;
1297
1298 ret = clk_prepare_enable(sdd->clk);
1299 if (ret != 0)
1300 goto err_disable_src_clk;
1301
1302 return 0;
1303
1304 err_disable_src_clk:
1305 clk_disable_unprepare(sdd->src_clk);
1306 err_disable_ioclk:
1307 clk_disable_unprepare(sdd->ioclk);
1308
1309 return ret;
1310 }
1311 #endif /* CONFIG_PM */
1312
1313 static const struct dev_pm_ops s3c64xx_spi_pm = {
1314 SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume)
1315 SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend,
1316 s3c64xx_spi_runtime_resume, NULL)
1317 };
1318
1319 static struct s3c64xx_spi_port_config s3c2443_spi_port_config = {
1320 .fifo_lvl_mask = { 0x7f },
1321 .rx_lvl_offset = 13,
1322 .tx_st_done = 21,
1323 .high_speed = true,
1324 };
1325
1326 static struct s3c64xx_spi_port_config s3c6410_spi_port_config = {
1327 .fifo_lvl_mask = { 0x7f, 0x7F },
1328 .rx_lvl_offset = 13,
1329 .tx_st_done = 21,
1330 };
1331
1332 static struct s3c64xx_spi_port_config s5pv210_spi_port_config = {
1333 .fifo_lvl_mask = { 0x1ff, 0x7F },
1334 .rx_lvl_offset = 15,
1335 .tx_st_done = 25,
1336 .high_speed = true,
1337 };
1338
1339 static struct s3c64xx_spi_port_config exynos4_spi_port_config = {
1340 .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F },
1341 .rx_lvl_offset = 15,
1342 .tx_st_done = 25,
1343 .high_speed = true,
1344 .clk_from_cmu = true,
1345 };
1346
1347 static struct s3c64xx_spi_port_config exynos5440_spi_port_config = {
1348 .fifo_lvl_mask = { 0x1ff },
1349 .rx_lvl_offset = 15,
1350 .tx_st_done = 25,
1351 .high_speed = true,
1352 .clk_from_cmu = true,
1353 .quirks = S3C64XX_SPI_QUIRK_POLL,
1354 };
1355
1356 static struct s3c64xx_spi_port_config exynos7_spi_port_config = {
1357 .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F, 0x7F, 0x7F, 0x1ff},
1358 .rx_lvl_offset = 15,
1359 .tx_st_done = 25,
1360 .high_speed = true,
1361 .clk_from_cmu = true,
1362 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1363 };
1364
1365 static struct s3c64xx_spi_port_config exynos5433_spi_port_config = {
1366 .fifo_lvl_mask = { 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff},
1367 .rx_lvl_offset = 15,
1368 .tx_st_done = 25,
1369 .high_speed = true,
1370 .clk_from_cmu = true,
1371 .clk_ioclk = true,
1372 .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
1373 };
1374
1375 static const struct platform_device_id s3c64xx_spi_driver_ids[] = {
1376 {
1377 .name = "s3c2443-spi",
1378 .driver_data = (kernel_ulong_t)&s3c2443_spi_port_config,
1379 }, {
1380 .name = "s3c6410-spi",
1381 .driver_data = (kernel_ulong_t)&s3c6410_spi_port_config,
1382 },
1383 { },
1384 };
1385
1386 static const struct of_device_id s3c64xx_spi_dt_match[] = {
1387 { .compatible = "samsung,s3c2443-spi",
1388 .data = (void *)&s3c2443_spi_port_config,
1389 },
1390 { .compatible = "samsung,s3c6410-spi",
1391 .data = (void *)&s3c6410_spi_port_config,
1392 },
1393 { .compatible = "samsung,s5pv210-spi",
1394 .data = (void *)&s5pv210_spi_port_config,
1395 },
1396 { .compatible = "samsung,exynos4210-spi",
1397 .data = (void *)&exynos4_spi_port_config,
1398 },
1399 { .compatible = "samsung,exynos5440-spi",
1400 .data = (void *)&exynos5440_spi_port_config,
1401 },
1402 { .compatible = "samsung,exynos7-spi",
1403 .data = (void *)&exynos7_spi_port_config,
1404 },
1405 { .compatible = "samsung,exynos5433-spi",
1406 .data = (void *)&exynos5433_spi_port_config,
1407 },
1408 { },
1409 };
1410 MODULE_DEVICE_TABLE(of, s3c64xx_spi_dt_match);
1411
1412 static struct platform_driver s3c64xx_spi_driver = {
1413 .driver = {
1414 .name = "s3c64xx-spi",
1415 .pm = &s3c64xx_spi_pm,
1416 .of_match_table = of_match_ptr(s3c64xx_spi_dt_match),
1417 },
1418 .probe = s3c64xx_spi_probe,
1419 .remove = s3c64xx_spi_remove,
1420 .id_table = s3c64xx_spi_driver_ids,
1421 };
1422 MODULE_ALIAS("platform:s3c64xx-spi");
1423
1424 module_platform_driver(s3c64xx_spi_driver);
1425
1426 MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
1427 MODULE_DESCRIPTION("S3C64XX SPI Controller Driver");
1428 MODULE_LICENSE("GPL");
Linux with added FPC-III support