blob: 68910b3101525e88bf9fcf675f7755ef5d790a04 [file] [log] [blame]
Grant Likelyca632f52011-06-06 01:16:30 -06001/*
Ben Dooks7fba5342006-05-20 15:00:18 -07002 * Copyright (c) 2006 Ben Dooks
Ben Dooksbec08062009-12-14 22:20:24 -08003 * Copyright 2006-2009 Simtec Electronics
Ben Dooks7fba5342006-05-20 15:00:18 -07004 * Ben Dooks <ben@simtec.co.uk>
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 version 2 as
8 * published by the Free Software Foundation.
9 *
10*/
11
Ben Dooks7fba5342006-05-20 15:00:18 -070012#include <linux/init.h>
13#include <linux/spinlock.h>
14#include <linux/workqueue.h>
15#include <linux/interrupt.h>
16#include <linux/delay.h>
17#include <linux/errno.h>
18#include <linux/err.h>
19#include <linux/clk.h>
20#include <linux/platform_device.h>
Ben Dooksee9c1fb2009-01-06 14:41:44 -080021#include <linux/gpio.h>
Ben Dooks1a0c2202009-09-22 16:46:12 -070022#include <linux/io.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Ben Dooks7fba5342006-05-20 15:00:18 -070024
25#include <linux/spi/spi.h>
26#include <linux/spi/spi_bitbang.h>
Heiko Stuebnerf35ef7c2012-01-31 20:06:07 +090027#include <linux/spi/s3c24xx.h>
Paul Gortmakerd7614de2011-07-03 15:44:29 -040028#include <linux/module.h>
Ben Dooks7fba5342006-05-20 15:00:18 -070029
Ben Dooks13622702008-10-30 10:14:38 +000030#include <plat/regs-spi.h>
Ben Dooks7fba5342006-05-20 15:00:18 -070031
Ben Dooksbec08062009-12-14 22:20:24 -080032#include <plat/fiq.h>
33#include <asm/fiq.h>
34
Grant Likelyca632f52011-06-06 01:16:30 -060035#include "spi-s3c24xx-fiq.h"
Ben Dooksbec08062009-12-14 22:20:24 -080036
Ben Dooks570327d2009-09-22 16:46:14 -070037/**
38 * s3c24xx_spi_devstate - per device data
39 * @hz: Last frequency calculated for @sppre field.
40 * @mode: Last mode setting for the @spcon field.
41 * @spcon: Value to write to the SPCON register.
42 * @sppre: Value to write to the SPPRE register.
43 */
44struct s3c24xx_spi_devstate {
45 unsigned int hz;
46 unsigned int mode;
47 u8 spcon;
48 u8 sppre;
49};
50
Ben Dooksbec08062009-12-14 22:20:24 -080051enum spi_fiq_mode {
52 FIQ_MODE_NONE = 0,
53 FIQ_MODE_TX = 1,
54 FIQ_MODE_RX = 2,
55 FIQ_MODE_TXRX = 3,
56};
57
Ben Dooks7fba5342006-05-20 15:00:18 -070058struct s3c24xx_spi {
59 /* bitbang has to be first */
60 struct spi_bitbang bitbang;
61 struct completion done;
62
63 void __iomem *regs;
64 int irq;
65 int len;
66 int count;
67
Ben Dooksbec08062009-12-14 22:20:24 -080068 struct fiq_handler fiq_handler;
69 enum spi_fiq_mode fiq_mode;
70 unsigned char fiq_inuse;
71 unsigned char fiq_claimed;
72
Arnaud Patard (Rtp6c912a32007-03-16 13:38:36 -080073 void (*set_cs)(struct s3c2410_spi_info *spi,
Ben Dooks8736b922007-01-26 00:56:43 -080074 int cs, int pol);
75
Ben Dooks7fba5342006-05-20 15:00:18 -070076 /* data buffers */
77 const unsigned char *tx;
78 unsigned char *rx;
79
80 struct clk *clk;
81 struct resource *ioarea;
82 struct spi_master *master;
83 struct spi_device *curdev;
84 struct device *dev;
85 struct s3c2410_spi_info *pdata;
86};
87
Ben Dooksbec08062009-12-14 22:20:24 -080088
Ben Dooks7fba5342006-05-20 15:00:18 -070089#define SPCON_DEFAULT (S3C2410_SPCON_MSTR | S3C2410_SPCON_SMOD_INT)
90#define SPPIN_DEFAULT (S3C2410_SPPIN_KEEP)
91
92static inline struct s3c24xx_spi *to_hw(struct spi_device *sdev)
93{
94 return spi_master_get_devdata(sdev->master);
95}
96
Ben Dooks8736b922007-01-26 00:56:43 -080097static void s3c24xx_spi_gpiocs(struct s3c2410_spi_info *spi, int cs, int pol)
98{
Ben Dooksee9c1fb2009-01-06 14:41:44 -080099 gpio_set_value(spi->pin_cs, pol);
Ben Dooks8736b922007-01-26 00:56:43 -0800100}
101
Ben Dooks7fba5342006-05-20 15:00:18 -0700102static void s3c24xx_spi_chipsel(struct spi_device *spi, int value)
103{
Ben Dooks570327d2009-09-22 16:46:14 -0700104 struct s3c24xx_spi_devstate *cs = spi->controller_state;
Ben Dooks7fba5342006-05-20 15:00:18 -0700105 struct s3c24xx_spi *hw = to_hw(spi);
106 unsigned int cspol = spi->mode & SPI_CS_HIGH ? 1 : 0;
Ben Dooks570327d2009-09-22 16:46:14 -0700107
108 /* change the chipselect state and the state of the spi engine clock */
Ben Dooks7fba5342006-05-20 15:00:18 -0700109
110 switch (value) {
111 case BITBANG_CS_INACTIVE:
Ben Dooks3d2c5b42007-04-16 22:53:22 -0700112 hw->set_cs(hw->pdata, spi->chip_select, cspol^1);
Ben Dooks570327d2009-09-22 16:46:14 -0700113 writeb(cs->spcon, hw->regs + S3C2410_SPCON);
Ben Dooks7fba5342006-05-20 15:00:18 -0700114 break;
115
116 case BITBANG_CS_ACTIVE:
Ben Dooks570327d2009-09-22 16:46:14 -0700117 writeb(cs->spcon | S3C2410_SPCON_ENSCK,
118 hw->regs + S3C2410_SPCON);
Ben Dooks3d2c5b42007-04-16 22:53:22 -0700119 hw->set_cs(hw->pdata, spi->chip_select, cspol);
Ben Dooks7fba5342006-05-20 15:00:18 -0700120 break;
Ben Dooks7fba5342006-05-20 15:00:18 -0700121 }
122}
123
Ben Dooks570327d2009-09-22 16:46:14 -0700124static int s3c24xx_spi_update_state(struct spi_device *spi,
125 struct spi_transfer *t)
Ben Dooks7fba5342006-05-20 15:00:18 -0700126{
127 struct s3c24xx_spi *hw = to_hw(spi);
Ben Dooks570327d2009-09-22 16:46:14 -0700128 struct s3c24xx_spi_devstate *cs = spi->controller_state;
Ben Dooks7fba5342006-05-20 15:00:18 -0700129 unsigned int bpw;
130 unsigned int hz;
131 unsigned int div;
Ben Dooksb8978782009-08-18 14:11:16 -0700132 unsigned long clk;
Ben Dooks7fba5342006-05-20 15:00:18 -0700133
134 bpw = t ? t->bits_per_word : spi->bits_per_word;
135 hz = t ? t->speed_hz : spi->max_speed_hz;
136
Ben Dooks19152972009-08-18 14:11:17 -0700137 if (!bpw)
138 bpw = 8;
139
140 if (!hz)
141 hz = spi->max_speed_hz;
142
Ben Dooks7fba5342006-05-20 15:00:18 -0700143 if (bpw != 8) {
144 dev_err(&spi->dev, "invalid bits-per-word (%d)\n", bpw);
145 return -EINVAL;
146 }
147
Ben Dooks570327d2009-09-22 16:46:14 -0700148 if (spi->mode != cs->mode) {
Ben Dooksbec08062009-12-14 22:20:24 -0800149 u8 spcon = SPCON_DEFAULT | S3C2410_SPCON_ENSCK;
Ben Dooks7fba5342006-05-20 15:00:18 -0700150
Ben Dooks570327d2009-09-22 16:46:14 -0700151 if (spi->mode & SPI_CPHA)
152 spcon |= S3C2410_SPCON_CPHA_FMTB;
Ben Dooks7fba5342006-05-20 15:00:18 -0700153
Ben Dooks570327d2009-09-22 16:46:14 -0700154 if (spi->mode & SPI_CPOL)
155 spcon |= S3C2410_SPCON_CPOL_HIGH;
Ben Dooksb8978782009-08-18 14:11:16 -0700156
Ben Dooks570327d2009-09-22 16:46:14 -0700157 cs->mode = spi->mode;
158 cs->spcon = spcon;
159 }
Ben Dooksb8978782009-08-18 14:11:16 -0700160
Ben Dooks570327d2009-09-22 16:46:14 -0700161 if (cs->hz != hz) {
162 clk = clk_get_rate(hw->clk);
163 div = DIV_ROUND_UP(clk, hz * 2) - 1;
164
165 if (div > 255)
166 div = 255;
167
168 dev_dbg(&spi->dev, "pre-scaler=%d (wanted %d, got %ld)\n",
169 div, hz, clk / (2 * (div + 1)));
170
171 cs->hz = hz;
172 cs->sppre = div;
173 }
174
175 return 0;
176}
177
178static int s3c24xx_spi_setupxfer(struct spi_device *spi,
179 struct spi_transfer *t)
180{
181 struct s3c24xx_spi_devstate *cs = spi->controller_state;
182 struct s3c24xx_spi *hw = to_hw(spi);
183 int ret;
184
185 ret = s3c24xx_spi_update_state(spi, t);
186 if (!ret)
187 writeb(cs->sppre, hw->regs + S3C2410_SPPRE);
188
189 return ret;
190}
191
192static int s3c24xx_spi_setup(struct spi_device *spi)
193{
194 struct s3c24xx_spi_devstate *cs = spi->controller_state;
195 struct s3c24xx_spi *hw = to_hw(spi);
196 int ret;
197
198 /* allocate settings on the first call */
199 if (!cs) {
200 cs = kzalloc(sizeof(struct s3c24xx_spi_devstate), GFP_KERNEL);
201 if (!cs) {
202 dev_err(&spi->dev, "no memory for controller state\n");
203 return -ENOMEM;
204 }
205
206 cs->spcon = SPCON_DEFAULT;
207 cs->hz = -1;
208 spi->controller_state = cs;
209 }
210
211 /* initialise the state from the device */
212 ret = s3c24xx_spi_update_state(spi, NULL);
213 if (ret)
214 return ret;
Ben Dooks7fba5342006-05-20 15:00:18 -0700215
216 spin_lock(&hw->bitbang.lock);
217 if (!hw->bitbang.busy) {
218 hw->bitbang.chipselect(spi, BITBANG_CS_INACTIVE);
219 /* need to ndelay for 0.5 clocktick ? */
220 }
221 spin_unlock(&hw->bitbang.lock);
222
223 return 0;
224}
225
Ben Dooks570327d2009-09-22 16:46:14 -0700226static void s3c24xx_spi_cleanup(struct spi_device *spi)
Ben Dooks7fba5342006-05-20 15:00:18 -0700227{
Ben Dooks570327d2009-09-22 16:46:14 -0700228 kfree(spi->controller_state);
Ben Dooks7fba5342006-05-20 15:00:18 -0700229}
230
231static inline unsigned int hw_txbyte(struct s3c24xx_spi *hw, int count)
232{
David Brownell4b1badf2006-12-29 16:48:39 -0800233 return hw->tx ? hw->tx[count] : 0;
Ben Dooks7fba5342006-05-20 15:00:18 -0700234}
235
Ben Dooksbec08062009-12-14 22:20:24 -0800236#ifdef CONFIG_SPI_S3C24XX_FIQ
237/* Support for FIQ based pseudo-DMA to improve the transfer speed.
238 *
239 * This code uses the assembly helper in spi_s3c24xx_spi.S which is
240 * used by the FIQ core to move data between main memory and the peripheral
241 * block. Since this is code running on the processor, there is no problem
242 * with cache coherency of the buffers, so we can use any buffer we like.
243 */
244
245/**
246 * struct spi_fiq_code - FIQ code and header
247 * @length: The length of the code fragment, excluding this header.
248 * @ack_offset: The offset from @data to the word to place the IRQ ACK bit at.
249 * @data: The code itself to install as a FIQ handler.
250 */
251struct spi_fiq_code {
252 u32 length;
253 u32 ack_offset;
254 u8 data[0];
255};
256
257extern struct spi_fiq_code s3c24xx_spi_fiq_txrx;
258extern struct spi_fiq_code s3c24xx_spi_fiq_tx;
259extern struct spi_fiq_code s3c24xx_spi_fiq_rx;
260
261/**
262 * ack_bit - turn IRQ into IRQ acknowledgement bit
263 * @irq: The interrupt number
264 *
265 * Returns the bit to write to the interrupt acknowledge register.
266 */
267static inline u32 ack_bit(unsigned int irq)
268{
269 return 1 << (irq - IRQ_EINT0);
270}
271
272/**
273 * s3c24xx_spi_tryfiq - attempt to claim and setup FIQ for transfer
274 * @hw: The hardware state.
275 *
276 * Claim the FIQ handler (only one can be active at any one time) and
277 * then setup the correct transfer code for this transfer.
278 *
Daniel Mack3ad2f3f2010-02-03 08:01:28 +0800279 * This call updates all the necessary state information if successful,
Ben Dooksbec08062009-12-14 22:20:24 -0800280 * so the caller does not need to do anything more than start the transfer
281 * as normal, since the IRQ will have been re-routed to the FIQ handler.
282*/
283void s3c24xx_spi_tryfiq(struct s3c24xx_spi *hw)
284{
285 struct pt_regs regs;
286 enum spi_fiq_mode mode;
287 struct spi_fiq_code *code;
288 int ret;
289
290 if (!hw->fiq_claimed) {
291 /* try and claim fiq if we haven't got it, and if not
292 * then return and simply use another transfer method */
293
294 ret = claim_fiq(&hw->fiq_handler);
295 if (ret)
296 return;
297 }
298
299 if (hw->tx && !hw->rx)
300 mode = FIQ_MODE_TX;
301 else if (hw->rx && !hw->tx)
302 mode = FIQ_MODE_RX;
303 else
304 mode = FIQ_MODE_TXRX;
305
306 regs.uregs[fiq_rspi] = (long)hw->regs;
307 regs.uregs[fiq_rrx] = (long)hw->rx;
308 regs.uregs[fiq_rtx] = (long)hw->tx + 1;
309 regs.uregs[fiq_rcount] = hw->len - 1;
310 regs.uregs[fiq_rirq] = (long)S3C24XX_VA_IRQ;
311
312 set_fiq_regs(&regs);
313
314 if (hw->fiq_mode != mode) {
315 u32 *ack_ptr;
316
317 hw->fiq_mode = mode;
318
319 switch (mode) {
320 case FIQ_MODE_TX:
321 code = &s3c24xx_spi_fiq_tx;
322 break;
323 case FIQ_MODE_RX:
324 code = &s3c24xx_spi_fiq_rx;
325 break;
326 case FIQ_MODE_TXRX:
327 code = &s3c24xx_spi_fiq_txrx;
328 break;
329 default:
330 code = NULL;
331 }
332
333 BUG_ON(!code);
334
335 ack_ptr = (u32 *)&code->data[code->ack_offset];
336 *ack_ptr = ack_bit(hw->irq);
337
338 set_fiq_handler(&code->data, code->length);
339 }
340
341 s3c24xx_set_fiq(hw->irq, true);
342
343 hw->fiq_mode = mode;
344 hw->fiq_inuse = 1;
345}
346
347/**
348 * s3c24xx_spi_fiqop - FIQ core code callback
349 * @pw: Data registered with the handler
350 * @release: Whether this is a release or a return.
351 *
352 * Called by the FIQ code when another module wants to use the FIQ, so
353 * return whether we are currently using this or not and then update our
354 * internal state.
355 */
356static int s3c24xx_spi_fiqop(void *pw, int release)
357{
358 struct s3c24xx_spi *hw = pw;
359 int ret = 0;
360
361 if (release) {
362 if (hw->fiq_inuse)
363 ret = -EBUSY;
364
365 /* note, we do not need to unroute the FIQ, as the FIQ
366 * vector code de-routes it to signal the end of transfer */
367
368 hw->fiq_mode = FIQ_MODE_NONE;
369 hw->fiq_claimed = 0;
370 } else {
371 hw->fiq_claimed = 1;
372 }
373
374 return ret;
375}
376
377/**
378 * s3c24xx_spi_initfiq - setup the information for the FIQ core
379 * @hw: The hardware state.
380 *
381 * Setup the fiq_handler block to pass to the FIQ core.
382 */
383static inline void s3c24xx_spi_initfiq(struct s3c24xx_spi *hw)
384{
385 hw->fiq_handler.dev_id = hw;
386 hw->fiq_handler.name = dev_name(hw->dev);
387 hw->fiq_handler.fiq_op = s3c24xx_spi_fiqop;
388}
389
390/**
391 * s3c24xx_spi_usefiq - return if we should be using FIQ.
392 * @hw: The hardware state.
393 *
394 * Return true if the platform data specifies whether this channel is
395 * allowed to use the FIQ.
396 */
397static inline bool s3c24xx_spi_usefiq(struct s3c24xx_spi *hw)
398{
399 return hw->pdata->use_fiq;
400}
401
402/**
403 * s3c24xx_spi_usingfiq - return if channel is using FIQ
404 * @spi: The hardware state.
405 *
406 * Return whether the channel is currently using the FIQ (separate from
407 * whether the FIQ is claimed).
408 */
409static inline bool s3c24xx_spi_usingfiq(struct s3c24xx_spi *spi)
410{
411 return spi->fiq_inuse;
412}
413#else
414
415static inline void s3c24xx_spi_initfiq(struct s3c24xx_spi *s) { }
416static inline void s3c24xx_spi_tryfiq(struct s3c24xx_spi *s) { }
417static inline bool s3c24xx_spi_usefiq(struct s3c24xx_spi *s) { return false; }
418static inline bool s3c24xx_spi_usingfiq(struct s3c24xx_spi *s) { return false; }
419
420#endif /* CONFIG_SPI_S3C24XX_FIQ */
421
Ben Dooks7fba5342006-05-20 15:00:18 -0700422static int s3c24xx_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
423{
424 struct s3c24xx_spi *hw = to_hw(spi);
425
Ben Dooks7fba5342006-05-20 15:00:18 -0700426 hw->tx = t->tx_buf;
427 hw->rx = t->rx_buf;
428 hw->len = t->len;
429 hw->count = 0;
430
Ben Dooks4bb5eba2008-04-15 14:34:44 -0700431 init_completion(&hw->done);
432
Ben Dooksbec08062009-12-14 22:20:24 -0800433 hw->fiq_inuse = 0;
434 if (s3c24xx_spi_usefiq(hw) && t->len >= 3)
435 s3c24xx_spi_tryfiq(hw);
436
Ben Dooks7fba5342006-05-20 15:00:18 -0700437 /* send the first byte */
438 writeb(hw_txbyte(hw, 0), hw->regs + S3C2410_SPTDAT);
Ben Dooks4bb5eba2008-04-15 14:34:44 -0700439
Ben Dooks7fba5342006-05-20 15:00:18 -0700440 wait_for_completion(&hw->done);
Ben Dooks7fba5342006-05-20 15:00:18 -0700441 return hw->count;
442}
443
David Howells7d12e782006-10-05 14:55:46 +0100444static irqreturn_t s3c24xx_spi_irq(int irq, void *dev)
Ben Dooks7fba5342006-05-20 15:00:18 -0700445{
446 struct s3c24xx_spi *hw = dev;
447 unsigned int spsta = readb(hw->regs + S3C2410_SPSTA);
448 unsigned int count = hw->count;
449
450 if (spsta & S3C2410_SPSTA_DCOL) {
451 dev_dbg(hw->dev, "data-collision\n");
452 complete(&hw->done);
453 goto irq_done;
454 }
455
456 if (!(spsta & S3C2410_SPSTA_READY)) {
457 dev_dbg(hw->dev, "spi not ready for tx?\n");
458 complete(&hw->done);
459 goto irq_done;
460 }
461
Ben Dooksbec08062009-12-14 22:20:24 -0800462 if (!s3c24xx_spi_usingfiq(hw)) {
463 hw->count++;
Ben Dooks7fba5342006-05-20 15:00:18 -0700464
Ben Dooksbec08062009-12-14 22:20:24 -0800465 if (hw->rx)
466 hw->rx[count] = readb(hw->regs + S3C2410_SPRDAT);
Ben Dooks7fba5342006-05-20 15:00:18 -0700467
Ben Dooksbec08062009-12-14 22:20:24 -0800468 count++;
Ben Dooks7fba5342006-05-20 15:00:18 -0700469
Ben Dooksbec08062009-12-14 22:20:24 -0800470 if (count < hw->len)
471 writeb(hw_txbyte(hw, count), hw->regs + S3C2410_SPTDAT);
472 else
473 complete(&hw->done);
474 } else {
475 hw->count = hw->len;
476 hw->fiq_inuse = 0;
477
478 if (hw->rx)
479 hw->rx[hw->len-1] = readb(hw->regs + S3C2410_SPRDAT);
480
Ben Dooks7fba5342006-05-20 15:00:18 -0700481 complete(&hw->done);
Ben Dooksbec08062009-12-14 22:20:24 -0800482 }
Ben Dooks7fba5342006-05-20 15:00:18 -0700483
484 irq_done:
485 return IRQ_HANDLED;
486}
487
Ben Dooks5aa6cf32008-08-04 13:41:10 -0700488static void s3c24xx_spi_initialsetup(struct s3c24xx_spi *hw)
489{
490 /* for the moment, permanently enable the clock */
491
492 clk_enable(hw->clk);
493
494 /* program defaults into the registers */
495
496 writeb(0xff, hw->regs + S3C2410_SPPRE);
497 writeb(SPPIN_DEFAULT, hw->regs + S3C2410_SPPIN);
498 writeb(SPCON_DEFAULT, hw->regs + S3C2410_SPCON);
Ben Dookscf46b972008-10-15 22:02:41 -0700499
Ben Dooksee9c1fb2009-01-06 14:41:44 -0800500 if (hw->pdata) {
501 if (hw->set_cs == s3c24xx_spi_gpiocs)
502 gpio_direction_output(hw->pdata->pin_cs, 1);
503
504 if (hw->pdata->gpio_setup)
505 hw->pdata->gpio_setup(hw->pdata, 1);
506 }
Ben Dooks5aa6cf32008-08-04 13:41:10 -0700507}
508
Grant Likelyfd4a3192012-12-07 16:57:14 +0000509static int s3c24xx_spi_probe(struct platform_device *pdev)
Ben Dooks7fba5342006-05-20 15:00:18 -0700510{
Ben Dooks50f426b2008-04-15 14:34:45 -0700511 struct s3c2410_spi_info *pdata;
Ben Dooks7fba5342006-05-20 15:00:18 -0700512 struct s3c24xx_spi *hw;
513 struct spi_master *master;
Ben Dooks7fba5342006-05-20 15:00:18 -0700514 struct resource *res;
515 int err = 0;
Ben Dooks7fba5342006-05-20 15:00:18 -0700516
517 master = spi_alloc_master(&pdev->dev, sizeof(struct s3c24xx_spi));
518 if (master == NULL) {
519 dev_err(&pdev->dev, "No memory for spi_master\n");
520 err = -ENOMEM;
521 goto err_nomem;
522 }
523
524 hw = spi_master_get_devdata(master);
525 memset(hw, 0, sizeof(struct s3c24xx_spi));
526
527 hw->master = spi_master_get(master);
Ben Dooks50f426b2008-04-15 14:34:45 -0700528 hw->pdata = pdata = pdev->dev.platform_data;
Ben Dooks7fba5342006-05-20 15:00:18 -0700529 hw->dev = &pdev->dev;
530
Ben Dooks50f426b2008-04-15 14:34:45 -0700531 if (pdata == NULL) {
Ben Dooks7fba5342006-05-20 15:00:18 -0700532 dev_err(&pdev->dev, "No platform data supplied\n");
533 err = -ENOENT;
534 goto err_no_pdata;
535 }
536
537 platform_set_drvdata(pdev, hw);
538 init_completion(&hw->done);
539
Ben Dooksbec08062009-12-14 22:20:24 -0800540 /* initialise fiq handler */
541
542 s3c24xx_spi_initfiq(hw);
543
Ben Dooksd1e77802008-04-15 14:34:46 -0700544 /* setup the master state. */
545
David Brownelle7db06b2009-06-17 16:26:04 -0700546 /* the spi->mode bits understood by this driver: */
547 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
548
Ben Dooksd1e77802008-04-15 14:34:46 -0700549 master->num_chipselect = hw->pdata->num_cs;
Ben Dookscb1d0a72008-07-28 15:46:33 -0700550 master->bus_num = pdata->bus_num;
Ben Dooksd1e77802008-04-15 14:34:46 -0700551
Ben Dooks7fba5342006-05-20 15:00:18 -0700552 /* setup the state for the bitbang driver */
553
554 hw->bitbang.master = hw->master;
555 hw->bitbang.setup_transfer = s3c24xx_spi_setupxfer;
556 hw->bitbang.chipselect = s3c24xx_spi_chipsel;
557 hw->bitbang.txrx_bufs = s3c24xx_spi_txrx;
Ben Dooks570327d2009-09-22 16:46:14 -0700558
559 hw->master->setup = s3c24xx_spi_setup;
560 hw->master->cleanup = s3c24xx_spi_cleanup;
Ben Dooks7fba5342006-05-20 15:00:18 -0700561
562 dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang);
563
564 /* find and map our resources */
565
566 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
567 if (res == NULL) {
568 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
569 err = -ENOENT;
570 goto err_no_iores;
571 }
572
Ben Dooksb5e3afb2009-09-22 16:46:13 -0700573 hw->ioarea = request_mem_region(res->start, resource_size(res),
Ben Dooks7fba5342006-05-20 15:00:18 -0700574 pdev->name);
575
576 if (hw->ioarea == NULL) {
577 dev_err(&pdev->dev, "Cannot reserve region\n");
578 err = -ENXIO;
579 goto err_no_iores;
580 }
581
Ben Dooksb5e3afb2009-09-22 16:46:13 -0700582 hw->regs = ioremap(res->start, resource_size(res));
Ben Dooks7fba5342006-05-20 15:00:18 -0700583 if (hw->regs == NULL) {
584 dev_err(&pdev->dev, "Cannot map IO\n");
585 err = -ENXIO;
586 goto err_no_iomap;
587 }
588
589 hw->irq = platform_get_irq(pdev, 0);
590 if (hw->irq < 0) {
591 dev_err(&pdev->dev, "No IRQ specified\n");
592 err = -ENOENT;
593 goto err_no_irq;
594 }
595
596 err = request_irq(hw->irq, s3c24xx_spi_irq, 0, pdev->name, hw);
597 if (err) {
598 dev_err(&pdev->dev, "Cannot claim IRQ\n");
599 goto err_no_irq;
600 }
601
602 hw->clk = clk_get(&pdev->dev, "spi");
603 if (IS_ERR(hw->clk)) {
604 dev_err(&pdev->dev, "No clock for device\n");
605 err = PTR_ERR(hw->clk);
606 goto err_no_clk;
607 }
608
Ben Dooks7fba5342006-05-20 15:00:18 -0700609 /* setup any gpio we can */
610
Ben Dooks50f426b2008-04-15 14:34:45 -0700611 if (!pdata->set_cs) {
Ben Dooksee9c1fb2009-01-06 14:41:44 -0800612 if (pdata->pin_cs < 0) {
613 dev_err(&pdev->dev, "No chipselect pin\n");
Julia Lawallb2af0452012-08-22 13:42:47 +0200614 err = -EINVAL;
Ben Dooksee9c1fb2009-01-06 14:41:44 -0800615 goto err_register;
616 }
Ben Dooks8736b922007-01-26 00:56:43 -0800617
Ben Dooksee9c1fb2009-01-06 14:41:44 -0800618 err = gpio_request(pdata->pin_cs, dev_name(&pdev->dev));
619 if (err) {
620 dev_err(&pdev->dev, "Failed to get gpio for cs\n");
621 goto err_register;
622 }
623
624 hw->set_cs = s3c24xx_spi_gpiocs;
625 gpio_direction_output(pdata->pin_cs, 1);
Ben Dooks8736b922007-01-26 00:56:43 -0800626 } else
Ben Dooks50f426b2008-04-15 14:34:45 -0700627 hw->set_cs = pdata->set_cs;
Ben Dooks7fba5342006-05-20 15:00:18 -0700628
Ben Dooksee9c1fb2009-01-06 14:41:44 -0800629 s3c24xx_spi_initialsetup(hw);
630
Ben Dooks7fba5342006-05-20 15:00:18 -0700631 /* register our spi controller */
632
633 err = spi_bitbang_start(&hw->bitbang);
634 if (err) {
635 dev_err(&pdev->dev, "Failed to register SPI master\n");
636 goto err_register;
637 }
638
Ben Dooks7fba5342006-05-20 15:00:18 -0700639 return 0;
640
641 err_register:
Ben Dooksee9c1fb2009-01-06 14:41:44 -0800642 if (hw->set_cs == s3c24xx_spi_gpiocs)
643 gpio_free(pdata->pin_cs);
644
Ben Dooks7fba5342006-05-20 15:00:18 -0700645 clk_disable(hw->clk);
646 clk_put(hw->clk);
647
648 err_no_clk:
649 free_irq(hw->irq, hw);
650
651 err_no_irq:
652 iounmap(hw->regs);
653
654 err_no_iomap:
655 release_resource(hw->ioarea);
656 kfree(hw->ioarea);
657
658 err_no_iores:
659 err_no_pdata:
Joe Perchesa419aef2009-08-18 11:18:35 -0700660 spi_master_put(hw->master);
Ben Dooks7fba5342006-05-20 15:00:18 -0700661
662 err_nomem:
663 return err;
664}
665
Grant Likelyfd4a3192012-12-07 16:57:14 +0000666static int s3c24xx_spi_remove(struct platform_device *dev)
Ben Dooks7fba5342006-05-20 15:00:18 -0700667{
668 struct s3c24xx_spi *hw = platform_get_drvdata(dev);
669
Axel Linc6e7b8c2011-05-15 07:35:16 +0800670 spi_bitbang_stop(&hw->bitbang);
Ben Dooks7fba5342006-05-20 15:00:18 -0700671
672 clk_disable(hw->clk);
673 clk_put(hw->clk);
674
675 free_irq(hw->irq, hw);
676 iounmap(hw->regs);
677
Ben Dooksee9c1fb2009-01-06 14:41:44 -0800678 if (hw->set_cs == s3c24xx_spi_gpiocs)
679 gpio_free(hw->pdata->pin_cs);
680
Ben Dooks7fba5342006-05-20 15:00:18 -0700681 release_resource(hw->ioarea);
682 kfree(hw->ioarea);
683
684 spi_master_put(hw->master);
685 return 0;
686}
687
688
689#ifdef CONFIG_PM
690
Ben Dooks6d613202009-09-22 16:46:13 -0700691static int s3c24xx_spi_suspend(struct device *dev)
Ben Dooks7fba5342006-05-20 15:00:18 -0700692{
Ben Dooks6d613202009-09-22 16:46:13 -0700693 struct s3c24xx_spi *hw = platform_get_drvdata(to_platform_device(dev));
Ben Dooks7fba5342006-05-20 15:00:18 -0700694
Ben Dookscf46b972008-10-15 22:02:41 -0700695 if (hw->pdata && hw->pdata->gpio_setup)
696 hw->pdata->gpio_setup(hw->pdata, 0);
697
Ben Dooks7fba5342006-05-20 15:00:18 -0700698 clk_disable(hw->clk);
699 return 0;
700}
701
Ben Dooks6d613202009-09-22 16:46:13 -0700702static int s3c24xx_spi_resume(struct device *dev)
Ben Dooks7fba5342006-05-20 15:00:18 -0700703{
Ben Dooks6d613202009-09-22 16:46:13 -0700704 struct s3c24xx_spi *hw = platform_get_drvdata(to_platform_device(dev));
Ben Dooks7fba5342006-05-20 15:00:18 -0700705
Ben Dooks5aa6cf32008-08-04 13:41:10 -0700706 s3c24xx_spi_initialsetup(hw);
Ben Dooks7fba5342006-05-20 15:00:18 -0700707 return 0;
708}
709
Alexey Dobriyan47145212009-12-14 18:00:08 -0800710static const struct dev_pm_ops s3c24xx_spi_pmops = {
Ben Dooks6d613202009-09-22 16:46:13 -0700711 .suspend = s3c24xx_spi_suspend,
712 .resume = s3c24xx_spi_resume,
713};
714
715#define S3C24XX_SPI_PMOPS &s3c24xx_spi_pmops
Ben Dooks7fba5342006-05-20 15:00:18 -0700716#else
Ben Dooks6d613202009-09-22 16:46:13 -0700717#define S3C24XX_SPI_PMOPS NULL
718#endif /* CONFIG_PM */
Ben Dooks7fba5342006-05-20 15:00:18 -0700719
Kay Sievers7e38c3c2008-04-10 21:29:20 -0700720MODULE_ALIAS("platform:s3c2410-spi");
Ben Dooks42cde432008-09-13 02:33:24 -0700721static struct platform_driver s3c24xx_spi_driver = {
Grant Likely940ab882011-10-05 11:29:49 -0600722 .probe = s3c24xx_spi_probe,
Grant Likelyfd4a3192012-12-07 16:57:14 +0000723 .remove = s3c24xx_spi_remove,
Ben Dooks7fba5342006-05-20 15:00:18 -0700724 .driver = {
725 .name = "s3c2410-spi",
726 .owner = THIS_MODULE,
Ben Dooks6d613202009-09-22 16:46:13 -0700727 .pm = S3C24XX_SPI_PMOPS,
Ben Dooks7fba5342006-05-20 15:00:18 -0700728 },
729};
Grant Likely940ab882011-10-05 11:29:49 -0600730module_platform_driver(s3c24xx_spi_driver);
Ben Dooks7fba5342006-05-20 15:00:18 -0700731
732MODULE_DESCRIPTION("S3C24XX SPI Driver");
733MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
734MODULE_LICENSE("GPL");