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Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001/*
2 * OMAP2 McSPI controller driver
3 *
4 * Copyright (C) 2005, 2006 Nokia Corporation
5 * Author: Samuel Ortiz <samuel.ortiz@nokia.com> and
Charulatha V1a5d8192011-02-02 17:52:14 +05306 * Juha Yrj�l� <juha.yrjola@nokia.com>
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07007 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24#include <linux/kernel.h>
25#include <linux/init.h>
26#include <linux/interrupt.h>
27#include <linux/module.h>
28#include <linux/device.h>
29#include <linux/delay.h>
30#include <linux/dma-mapping.h>
31#include <linux/platform_device.h>
32#include <linux/err.h>
33#include <linux/clk.h>
34#include <linux/io.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090035#include <linux/slab.h>
Govindraj.R1f1a4382011-02-02 17:52:15 +053036#include <linux/pm_runtime.h>
Benoit Coussond5a80032012-02-15 18:37:34 +010037#include <linux/of.h>
38#include <linux/of_device.h>
Samuel Ortizccdc7bf2007-07-17 04:04:13 -070039
40#include <linux/spi/spi.h>
41
Tony Lindgrence491cf2009-10-20 09:40:47 -070042#include <plat/dma.h>
43#include <plat/clock.h>
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +000044#include <plat/mcspi.h>
Samuel Ortizccdc7bf2007-07-17 04:04:13 -070045
46#define OMAP2_MCSPI_MAX_FREQ 48000000
Shubhrajyoti D27b52842012-03-26 17:04:22 +053047#define SPI_AUTOSUSPEND_TIMEOUT 2000
Samuel Ortizccdc7bf2007-07-17 04:04:13 -070048
49#define OMAP2_MCSPI_REVISION 0x00
Samuel Ortizccdc7bf2007-07-17 04:04:13 -070050#define OMAP2_MCSPI_SYSSTATUS 0x14
51#define OMAP2_MCSPI_IRQSTATUS 0x18
52#define OMAP2_MCSPI_IRQENABLE 0x1c
53#define OMAP2_MCSPI_WAKEUPENABLE 0x20
54#define OMAP2_MCSPI_SYST 0x24
55#define OMAP2_MCSPI_MODULCTRL 0x28
56
57/* per-channel banks, 0x14 bytes each, first is: */
58#define OMAP2_MCSPI_CHCONF0 0x2c
59#define OMAP2_MCSPI_CHSTAT0 0x30
60#define OMAP2_MCSPI_CHCTRL0 0x34
61#define OMAP2_MCSPI_TX0 0x38
62#define OMAP2_MCSPI_RX0 0x3c
63
64/* per-register bitmasks: */
65
Jouni Hogander7a8fa722009-09-22 16:45:58 -070066#define OMAP2_MCSPI_MODULCTRL_SINGLE BIT(0)
67#define OMAP2_MCSPI_MODULCTRL_MS BIT(2)
68#define OMAP2_MCSPI_MODULCTRL_STEST BIT(3)
Samuel Ortizccdc7bf2007-07-17 04:04:13 -070069
Jouni Hogander7a8fa722009-09-22 16:45:58 -070070#define OMAP2_MCSPI_CHCONF_PHA BIT(0)
71#define OMAP2_MCSPI_CHCONF_POL BIT(1)
Samuel Ortizccdc7bf2007-07-17 04:04:13 -070072#define OMAP2_MCSPI_CHCONF_CLKD_MASK (0x0f << 2)
Jouni Hogander7a8fa722009-09-22 16:45:58 -070073#define OMAP2_MCSPI_CHCONF_EPOL BIT(6)
Samuel Ortizccdc7bf2007-07-17 04:04:13 -070074#define OMAP2_MCSPI_CHCONF_WL_MASK (0x1f << 7)
Jouni Hogander7a8fa722009-09-22 16:45:58 -070075#define OMAP2_MCSPI_CHCONF_TRM_RX_ONLY BIT(12)
76#define OMAP2_MCSPI_CHCONF_TRM_TX_ONLY BIT(13)
Samuel Ortizccdc7bf2007-07-17 04:04:13 -070077#define OMAP2_MCSPI_CHCONF_TRM_MASK (0x03 << 12)
Jouni Hogander7a8fa722009-09-22 16:45:58 -070078#define OMAP2_MCSPI_CHCONF_DMAW BIT(14)
79#define OMAP2_MCSPI_CHCONF_DMAR BIT(15)
80#define OMAP2_MCSPI_CHCONF_DPE0 BIT(16)
81#define OMAP2_MCSPI_CHCONF_DPE1 BIT(17)
82#define OMAP2_MCSPI_CHCONF_IS BIT(18)
83#define OMAP2_MCSPI_CHCONF_TURBO BIT(19)
84#define OMAP2_MCSPI_CHCONF_FORCE BIT(20)
Samuel Ortizccdc7bf2007-07-17 04:04:13 -070085
Jouni Hogander7a8fa722009-09-22 16:45:58 -070086#define OMAP2_MCSPI_CHSTAT_RXS BIT(0)
87#define OMAP2_MCSPI_CHSTAT_TXS BIT(1)
88#define OMAP2_MCSPI_CHSTAT_EOT BIT(2)
Samuel Ortizccdc7bf2007-07-17 04:04:13 -070089
Jouni Hogander7a8fa722009-09-22 16:45:58 -070090#define OMAP2_MCSPI_CHCTRL_EN BIT(0)
Samuel Ortizccdc7bf2007-07-17 04:04:13 -070091
Jouni Hogander7a8fa722009-09-22 16:45:58 -070092#define OMAP2_MCSPI_WAKEUPENABLE_WKEN BIT(0)
Samuel Ortizccdc7bf2007-07-17 04:04:13 -070093
94/* We have 2 DMA channels per CS, one for RX and one for TX */
95struct omap2_mcspi_dma {
96 int dma_tx_channel;
97 int dma_rx_channel;
98
99 int dma_tx_sync_dev;
100 int dma_rx_sync_dev;
101
102 struct completion dma_tx_completion;
103 struct completion dma_rx_completion;
104};
105
106/* use PIO for small transfers, avoiding DMA setup/teardown overhead and
107 * cache operations; better heuristics consider wordsize and bitrate.
108 */
Roman Tereshonkov8b66c132010-04-12 09:07:54 +0000109#define DMA_MIN_BYTES 160
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700110
111
Benoit Cousson1bd897f82012-03-26 15:32:33 +0530112/*
113 * Used for context save and restore, structure members to be updated whenever
114 * corresponding registers are modified.
115 */
116struct omap2_mcspi_regs {
117 u32 modulctrl;
118 u32 wakeupenable;
119 struct list_head cs;
120};
121
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700122struct omap2_mcspi {
123 struct work_struct work;
124 /* lock protects queue and registers */
125 spinlock_t lock;
126 struct list_head msg_queue;
127 struct spi_master *master;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700128 /* Virtual base address of the controller */
129 void __iomem *base;
Russell Kinge5480b732008-09-01 21:51:50 +0100130 unsigned long phys;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700131 /* SPI1 has 4 channels, while SPI2 has 2 */
132 struct omap2_mcspi_dma *dma_channels;
Benoit Cousson1bd897f82012-03-26 15:32:33 +0530133 struct device *dev;
Shubhrajyoti D2856ac12011-10-28 17:14:17 +0530134 struct workqueue_struct *wq;
Benoit Cousson1bd897f82012-03-26 15:32:33 +0530135 struct omap2_mcspi_regs ctx;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700136};
137
138struct omap2_mcspi_cs {
139 void __iomem *base;
Russell Kinge5480b732008-09-01 21:51:50 +0100140 unsigned long phys;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700141 int word_len;
Tero Kristo89c05372009-09-22 16:46:17 -0700142 struct list_head node;
Hemanth Va41ae1a2009-09-22 16:46:16 -0700143 /* Context save and restore shadow register */
144 u32 chconf0;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700145};
146
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700147#define MOD_REG_BIT(val, mask, set) do { \
148 if (set) \
149 val |= mask; \
150 else \
151 val &= ~mask; \
152} while (0)
153
154static inline void mcspi_write_reg(struct spi_master *master,
155 int idx, u32 val)
156{
157 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
158
159 __raw_writel(val, mcspi->base + idx);
160}
161
162static inline u32 mcspi_read_reg(struct spi_master *master, int idx)
163{
164 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
165
166 return __raw_readl(mcspi->base + idx);
167}
168
169static inline void mcspi_write_cs_reg(const struct spi_device *spi,
170 int idx, u32 val)
171{
172 struct omap2_mcspi_cs *cs = spi->controller_state;
173
174 __raw_writel(val, cs->base + idx);
175}
176
177static inline u32 mcspi_read_cs_reg(const struct spi_device *spi, int idx)
178{
179 struct omap2_mcspi_cs *cs = spi->controller_state;
180
181 return __raw_readl(cs->base + idx);
182}
183
Hemanth Va41ae1a2009-09-22 16:46:16 -0700184static inline u32 mcspi_cached_chconf0(const struct spi_device *spi)
185{
186 struct omap2_mcspi_cs *cs = spi->controller_state;
187
188 return cs->chconf0;
189}
190
191static inline void mcspi_write_chconf0(const struct spi_device *spi, u32 val)
192{
193 struct omap2_mcspi_cs *cs = spi->controller_state;
194
195 cs->chconf0 = val;
196 mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, val);
Roman Tereshonkova330ce22010-03-15 09:06:28 +0000197 mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0);
Hemanth Va41ae1a2009-09-22 16:46:16 -0700198}
199
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700200static void omap2_mcspi_set_dma_req(const struct spi_device *spi,
201 int is_read, int enable)
202{
203 u32 l, rw;
204
Hemanth Va41ae1a2009-09-22 16:46:16 -0700205 l = mcspi_cached_chconf0(spi);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700206
207 if (is_read) /* 1 is read, 0 write */
208 rw = OMAP2_MCSPI_CHCONF_DMAR;
209 else
210 rw = OMAP2_MCSPI_CHCONF_DMAW;
211
212 MOD_REG_BIT(l, rw, enable);
Hemanth Va41ae1a2009-09-22 16:46:16 -0700213 mcspi_write_chconf0(spi, l);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700214}
215
216static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable)
217{
218 u32 l;
219
220 l = enable ? OMAP2_MCSPI_CHCTRL_EN : 0;
221 mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, l);
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000222 /* Flash post-writes */
223 mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700224}
225
226static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active)
227{
228 u32 l;
229
Hemanth Va41ae1a2009-09-22 16:46:16 -0700230 l = mcspi_cached_chconf0(spi);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700231 MOD_REG_BIT(l, OMAP2_MCSPI_CHCONF_FORCE, cs_active);
Hemanth Va41ae1a2009-09-22 16:46:16 -0700232 mcspi_write_chconf0(spi, l);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700233}
234
235static void omap2_mcspi_set_master_mode(struct spi_master *master)
236{
Benoit Cousson1bd897f82012-03-26 15:32:33 +0530237 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
238 struct omap2_mcspi_regs *ctx = &mcspi->ctx;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700239 u32 l;
240
Benoit Cousson1bd897f82012-03-26 15:32:33 +0530241 /*
242 * Setup when switching from (reset default) slave mode
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700243 * to single-channel master mode
244 */
245 l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL);
246 MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_STEST, 0);
247 MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_MS, 0);
248 MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_SINGLE, 1);
249 mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l);
Hemanth Va41ae1a2009-09-22 16:46:16 -0700250
Benoit Cousson1bd897f82012-03-26 15:32:33 +0530251 ctx->modulctrl = l;
Hemanth Va41ae1a2009-09-22 16:46:16 -0700252}
253
254static void omap2_mcspi_restore_ctx(struct omap2_mcspi *mcspi)
255{
Benoit Cousson1bd897f82012-03-26 15:32:33 +0530256 struct spi_master *spi_cntrl = mcspi->master;
257 struct omap2_mcspi_regs *ctx = &mcspi->ctx;
258 struct omap2_mcspi_cs *cs;
Hemanth Va41ae1a2009-09-22 16:46:16 -0700259
260 /* McSPI: context restore */
Benoit Cousson1bd897f82012-03-26 15:32:33 +0530261 mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_MODULCTRL, ctx->modulctrl);
262 mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_WAKEUPENABLE, ctx->wakeupenable);
Hemanth Va41ae1a2009-09-22 16:46:16 -0700263
Benoit Cousson1bd897f82012-03-26 15:32:33 +0530264 list_for_each_entry(cs, &ctx->cs, node)
Tero Kristo89c05372009-09-22 16:46:17 -0700265 __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
Hemanth Va41ae1a2009-09-22 16:46:16 -0700266}
267static void omap2_mcspi_disable_clocks(struct omap2_mcspi *mcspi)
268{
Shubhrajyoti D27b52842012-03-26 17:04:22 +0530269 pm_runtime_mark_last_busy(mcspi->dev);
270 pm_runtime_put_autosuspend(mcspi->dev);
Hemanth Va41ae1a2009-09-22 16:46:16 -0700271}
272
273static int omap2_mcspi_enable_clocks(struct omap2_mcspi *mcspi)
274{
Govindraj.R1f1a4382011-02-02 17:52:15 +0530275 return pm_runtime_get_sync(mcspi->dev);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700276}
277
Ilkka Koskinen2764c502010-10-19 17:07:31 +0300278static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit)
279{
280 unsigned long timeout;
281
282 timeout = jiffies + msecs_to_jiffies(1000);
283 while (!(__raw_readl(reg) & bit)) {
284 if (time_after(jiffies, timeout))
285 return -1;
286 cpu_relax();
287 }
288 return 0;
289}
290
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700291static unsigned
292omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
293{
294 struct omap2_mcspi *mcspi;
295 struct omap2_mcspi_cs *cs = spi->controller_state;
296 struct omap2_mcspi_dma *mcspi_dma;
297 unsigned int count, c;
298 unsigned long base, tx_reg, rx_reg;
299 int word_len, data_type, element_count;
Govindraj.R8b20c8c2011-06-01 11:31:24 +0530300 int elements = 0;
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000301 u32 l;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700302 u8 * rx;
303 const u8 * tx;
Ilkka Koskinen2764c502010-10-19 17:07:31 +0300304 void __iomem *chstat_reg;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700305
306 mcspi = spi_master_get_devdata(spi->master);
307 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000308 l = mcspi_cached_chconf0(spi);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700309
Ilkka Koskinen2764c502010-10-19 17:07:31 +0300310 chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0;
311
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700312 count = xfer->len;
313 c = count;
314 word_len = cs->word_len;
315
Russell Kinge5480b732008-09-01 21:51:50 +0100316 base = cs->phys;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700317 tx_reg = base + OMAP2_MCSPI_TX0;
318 rx_reg = base + OMAP2_MCSPI_RX0;
319 rx = xfer->rx_buf;
320 tx = xfer->tx_buf;
321
322 if (word_len <= 8) {
323 data_type = OMAP_DMA_DATA_TYPE_S8;
324 element_count = count;
325 } else if (word_len <= 16) {
326 data_type = OMAP_DMA_DATA_TYPE_S16;
327 element_count = count >> 1;
328 } else /* word_len <= 32 */ {
329 data_type = OMAP_DMA_DATA_TYPE_S32;
330 element_count = count >> 2;
331 }
332
333 if (tx != NULL) {
334 omap_set_dma_transfer_params(mcspi_dma->dma_tx_channel,
335 data_type, element_count, 1,
336 OMAP_DMA_SYNC_ELEMENT,
337 mcspi_dma->dma_tx_sync_dev, 0);
338
339 omap_set_dma_dest_params(mcspi_dma->dma_tx_channel, 0,
340 OMAP_DMA_AMODE_CONSTANT,
341 tx_reg, 0, 0);
342
343 omap_set_dma_src_params(mcspi_dma->dma_tx_channel, 0,
344 OMAP_DMA_AMODE_POST_INC,
345 xfer->tx_dma, 0, 0);
346 }
347
348 if (rx != NULL) {
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000349 elements = element_count - 1;
350 if (l & OMAP2_MCSPI_CHCONF_TURBO)
351 elements--;
352
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700353 omap_set_dma_transfer_params(mcspi_dma->dma_rx_channel,
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000354 data_type, elements, 1,
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700355 OMAP_DMA_SYNC_ELEMENT,
356 mcspi_dma->dma_rx_sync_dev, 1);
357
358 omap_set_dma_src_params(mcspi_dma->dma_rx_channel, 0,
359 OMAP_DMA_AMODE_CONSTANT,
360 rx_reg, 0, 0);
361
362 omap_set_dma_dest_params(mcspi_dma->dma_rx_channel, 0,
363 OMAP_DMA_AMODE_POST_INC,
364 xfer->rx_dma, 0, 0);
365 }
366
367 if (tx != NULL) {
368 omap_start_dma(mcspi_dma->dma_tx_channel);
369 omap2_mcspi_set_dma_req(spi, 0, 1);
370 }
371
372 if (rx != NULL) {
373 omap_start_dma(mcspi_dma->dma_rx_channel);
374 omap2_mcspi_set_dma_req(spi, 1, 1);
375 }
376
377 if (tx != NULL) {
378 wait_for_completion(&mcspi_dma->dma_tx_completion);
Russell King - ARM Linux07fe0352011-01-07 15:49:20 +0000379 dma_unmap_single(&spi->dev, xfer->tx_dma, count, DMA_TO_DEVICE);
Ilkka Koskinen2764c502010-10-19 17:07:31 +0300380
381 /* for TX_ONLY mode, be sure all words have shifted out */
382 if (rx == NULL) {
383 if (mcspi_wait_for_reg_bit(chstat_reg,
384 OMAP2_MCSPI_CHSTAT_TXS) < 0)
385 dev_err(&spi->dev, "TXS timed out\n");
386 else if (mcspi_wait_for_reg_bit(chstat_reg,
387 OMAP2_MCSPI_CHSTAT_EOT) < 0)
388 dev_err(&spi->dev, "EOT timed out\n");
389 }
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700390 }
391
392 if (rx != NULL) {
393 wait_for_completion(&mcspi_dma->dma_rx_completion);
Russell King - ARM Linux07fe0352011-01-07 15:49:20 +0000394 dma_unmap_single(&spi->dev, xfer->rx_dma, count, DMA_FROM_DEVICE);
Eero Nurkkala57c5c28d2009-07-29 15:02:12 -0700395 omap2_mcspi_set_enable(spi, 0);
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000396
397 if (l & OMAP2_MCSPI_CHCONF_TURBO) {
398
399 if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
400 & OMAP2_MCSPI_CHSTAT_RXS)) {
401 u32 w;
402
403 w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
404 if (word_len <= 8)
405 ((u8 *)xfer->rx_buf)[elements++] = w;
406 else if (word_len <= 16)
407 ((u16 *)xfer->rx_buf)[elements++] = w;
408 else /* word_len <= 32 */
409 ((u32 *)xfer->rx_buf)[elements++] = w;
410 } else {
411 dev_err(&spi->dev,
412 "DMA RX penultimate word empty");
413 count -= (word_len <= 8) ? 2 :
414 (word_len <= 16) ? 4 :
415 /* word_len <= 32 */ 8;
416 omap2_mcspi_set_enable(spi, 1);
417 return count;
418 }
419 }
420
Eero Nurkkala57c5c28d2009-07-29 15:02:12 -0700421 if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
422 & OMAP2_MCSPI_CHSTAT_RXS)) {
423 u32 w;
424
425 w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
426 if (word_len <= 8)
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000427 ((u8 *)xfer->rx_buf)[elements] = w;
Eero Nurkkala57c5c28d2009-07-29 15:02:12 -0700428 else if (word_len <= 16)
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000429 ((u16 *)xfer->rx_buf)[elements] = w;
Eero Nurkkala57c5c28d2009-07-29 15:02:12 -0700430 else /* word_len <= 32 */
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000431 ((u32 *)xfer->rx_buf)[elements] = w;
Eero Nurkkala57c5c28d2009-07-29 15:02:12 -0700432 } else {
433 dev_err(&spi->dev, "DMA RX last word empty");
434 count -= (word_len <= 8) ? 1 :
435 (word_len <= 16) ? 2 :
436 /* word_len <= 32 */ 4;
437 }
438 omap2_mcspi_set_enable(spi, 1);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700439 }
440 return count;
441}
442
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700443static unsigned
444omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
445{
446 struct omap2_mcspi *mcspi;
447 struct omap2_mcspi_cs *cs = spi->controller_state;
448 unsigned int count, c;
449 u32 l;
450 void __iomem *base = cs->base;
451 void __iomem *tx_reg;
452 void __iomem *rx_reg;
453 void __iomem *chstat_reg;
454 int word_len;
455
456 mcspi = spi_master_get_devdata(spi->master);
457 count = xfer->len;
458 c = count;
459 word_len = cs->word_len;
460
Hemanth Va41ae1a2009-09-22 16:46:16 -0700461 l = mcspi_cached_chconf0(spi);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700462
463 /* We store the pre-calculated register addresses on stack to speed
464 * up the transfer loop. */
465 tx_reg = base + OMAP2_MCSPI_TX0;
466 rx_reg = base + OMAP2_MCSPI_RX0;
467 chstat_reg = base + OMAP2_MCSPI_CHSTAT0;
468
Michael Jonesadef6582011-02-25 16:55:11 +0100469 if (c < (word_len>>3))
470 return 0;
471
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700472 if (word_len <= 8) {
473 u8 *rx;
474 const u8 *tx;
475
476 rx = xfer->rx_buf;
477 tx = xfer->tx_buf;
478
479 do {
Kalle Valofeed9ba2008-01-24 14:00:40 -0800480 c -= 1;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700481 if (tx != NULL) {
482 if (mcspi_wait_for_reg_bit(chstat_reg,
483 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
484 dev_err(&spi->dev, "TXS timed out\n");
485 goto out;
486 }
Felipe Balbi079a1762010-09-29 17:31:29 +0900487 dev_vdbg(&spi->dev, "write-%d %02x\n",
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700488 word_len, *tx);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700489 __raw_writel(*tx++, tx_reg);
490 }
491 if (rx != NULL) {
492 if (mcspi_wait_for_reg_bit(chstat_reg,
493 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
494 dev_err(&spi->dev, "RXS timed out\n");
495 goto out;
496 }
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000497
498 if (c == 1 && tx == NULL &&
499 (l & OMAP2_MCSPI_CHCONF_TURBO)) {
500 omap2_mcspi_set_enable(spi, 0);
501 *rx++ = __raw_readl(rx_reg);
Felipe Balbi079a1762010-09-29 17:31:29 +0900502 dev_vdbg(&spi->dev, "read-%d %02x\n",
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000503 word_len, *(rx - 1));
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000504 if (mcspi_wait_for_reg_bit(chstat_reg,
505 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
506 dev_err(&spi->dev,
507 "RXS timed out\n");
508 goto out;
509 }
510 c = 0;
511 } else if (c == 0 && tx == NULL) {
512 omap2_mcspi_set_enable(spi, 0);
513 }
514
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700515 *rx++ = __raw_readl(rx_reg);
Felipe Balbi079a1762010-09-29 17:31:29 +0900516 dev_vdbg(&spi->dev, "read-%d %02x\n",
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700517 word_len, *(rx - 1));
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700518 }
Jarkko Nikula95c5c3a2011-03-21 16:27:30 +0200519 } while (c);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700520 } else if (word_len <= 16) {
521 u16 *rx;
522 const u16 *tx;
523
524 rx = xfer->rx_buf;
525 tx = xfer->tx_buf;
526 do {
Kalle Valofeed9ba2008-01-24 14:00:40 -0800527 c -= 2;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700528 if (tx != NULL) {
529 if (mcspi_wait_for_reg_bit(chstat_reg,
530 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
531 dev_err(&spi->dev, "TXS timed out\n");
532 goto out;
533 }
Felipe Balbi079a1762010-09-29 17:31:29 +0900534 dev_vdbg(&spi->dev, "write-%d %04x\n",
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700535 word_len, *tx);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700536 __raw_writel(*tx++, tx_reg);
537 }
538 if (rx != NULL) {
539 if (mcspi_wait_for_reg_bit(chstat_reg,
540 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
541 dev_err(&spi->dev, "RXS timed out\n");
542 goto out;
543 }
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000544
545 if (c == 2 && tx == NULL &&
546 (l & OMAP2_MCSPI_CHCONF_TURBO)) {
547 omap2_mcspi_set_enable(spi, 0);
548 *rx++ = __raw_readl(rx_reg);
Felipe Balbi079a1762010-09-29 17:31:29 +0900549 dev_vdbg(&spi->dev, "read-%d %04x\n",
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000550 word_len, *(rx - 1));
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000551 if (mcspi_wait_for_reg_bit(chstat_reg,
552 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
553 dev_err(&spi->dev,
554 "RXS timed out\n");
555 goto out;
556 }
557 c = 0;
558 } else if (c == 0 && tx == NULL) {
559 omap2_mcspi_set_enable(spi, 0);
560 }
561
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700562 *rx++ = __raw_readl(rx_reg);
Felipe Balbi079a1762010-09-29 17:31:29 +0900563 dev_vdbg(&spi->dev, "read-%d %04x\n",
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700564 word_len, *(rx - 1));
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700565 }
Jarkko Nikula95c5c3a2011-03-21 16:27:30 +0200566 } while (c >= 2);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700567 } else if (word_len <= 32) {
568 u32 *rx;
569 const u32 *tx;
570
571 rx = xfer->rx_buf;
572 tx = xfer->tx_buf;
573 do {
Kalle Valofeed9ba2008-01-24 14:00:40 -0800574 c -= 4;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700575 if (tx != NULL) {
576 if (mcspi_wait_for_reg_bit(chstat_reg,
577 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
578 dev_err(&spi->dev, "TXS timed out\n");
579 goto out;
580 }
Felipe Balbi079a1762010-09-29 17:31:29 +0900581 dev_vdbg(&spi->dev, "write-%d %08x\n",
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700582 word_len, *tx);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700583 __raw_writel(*tx++, tx_reg);
584 }
585 if (rx != NULL) {
586 if (mcspi_wait_for_reg_bit(chstat_reg,
587 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
588 dev_err(&spi->dev, "RXS timed out\n");
589 goto out;
590 }
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000591
592 if (c == 4 && tx == NULL &&
593 (l & OMAP2_MCSPI_CHCONF_TURBO)) {
594 omap2_mcspi_set_enable(spi, 0);
595 *rx++ = __raw_readl(rx_reg);
Felipe Balbi079a1762010-09-29 17:31:29 +0900596 dev_vdbg(&spi->dev, "read-%d %08x\n",
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000597 word_len, *(rx - 1));
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000598 if (mcspi_wait_for_reg_bit(chstat_reg,
599 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
600 dev_err(&spi->dev,
601 "RXS timed out\n");
602 goto out;
603 }
604 c = 0;
605 } else if (c == 0 && tx == NULL) {
606 omap2_mcspi_set_enable(spi, 0);
607 }
608
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700609 *rx++ = __raw_readl(rx_reg);
Felipe Balbi079a1762010-09-29 17:31:29 +0900610 dev_vdbg(&spi->dev, "read-%d %08x\n",
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700611 word_len, *(rx - 1));
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700612 }
Jarkko Nikula95c5c3a2011-03-21 16:27:30 +0200613 } while (c >= 4);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700614 }
615
616 /* for TX_ONLY mode, be sure all words have shifted out */
617 if (xfer->rx_buf == NULL) {
618 if (mcspi_wait_for_reg_bit(chstat_reg,
619 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
620 dev_err(&spi->dev, "TXS timed out\n");
621 } else if (mcspi_wait_for_reg_bit(chstat_reg,
622 OMAP2_MCSPI_CHSTAT_EOT) < 0)
623 dev_err(&spi->dev, "EOT timed out\n");
Jason Wange1993ed2010-10-19 18:03:27 +0800624
625 /* disable chan to purge rx datas received in TX_ONLY transfer,
626 * otherwise these rx datas will affect the direct following
627 * RX_ONLY transfer.
628 */
629 omap2_mcspi_set_enable(spi, 0);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700630 }
631out:
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000632 omap2_mcspi_set_enable(spi, 1);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700633 return count - c;
634}
635
Hannu Heikkinen57d9c102011-02-24 21:31:33 +0200636static u32 omap2_mcspi_calc_divisor(u32 speed_hz)
637{
638 u32 div;
639
640 for (div = 0; div < 15; div++)
641 if (speed_hz >= (OMAP2_MCSPI_MAX_FREQ >> div))
642 return div;
643
644 return 15;
645}
646
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700647/* called only when no transfer is active to this device */
648static int omap2_mcspi_setup_transfer(struct spi_device *spi,
649 struct spi_transfer *t)
650{
651 struct omap2_mcspi_cs *cs = spi->controller_state;
652 struct omap2_mcspi *mcspi;
Hemanth Va41ae1a2009-09-22 16:46:16 -0700653 struct spi_master *spi_cntrl;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700654 u32 l = 0, div = 0;
655 u8 word_len = spi->bits_per_word;
Scott Ellis9bd45172010-03-10 14:23:13 -0700656 u32 speed_hz = spi->max_speed_hz;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700657
658 mcspi = spi_master_get_devdata(spi->master);
Hemanth Va41ae1a2009-09-22 16:46:16 -0700659 spi_cntrl = mcspi->master;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700660
661 if (t != NULL && t->bits_per_word)
662 word_len = t->bits_per_word;
663
664 cs->word_len = word_len;
665
Scott Ellis9bd45172010-03-10 14:23:13 -0700666 if (t && t->speed_hz)
667 speed_hz = t->speed_hz;
668
Hannu Heikkinen57d9c102011-02-24 21:31:33 +0200669 speed_hz = min_t(u32, speed_hz, OMAP2_MCSPI_MAX_FREQ);
670 div = omap2_mcspi_calc_divisor(speed_hz);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700671
Hemanth Va41ae1a2009-09-22 16:46:16 -0700672 l = mcspi_cached_chconf0(spi);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700673
674 /* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS
675 * REVISIT: this controller could support SPI_3WIRE mode.
676 */
677 l &= ~(OMAP2_MCSPI_CHCONF_IS|OMAP2_MCSPI_CHCONF_DPE1);
678 l |= OMAP2_MCSPI_CHCONF_DPE0;
679
680 /* wordlength */
681 l &= ~OMAP2_MCSPI_CHCONF_WL_MASK;
682 l |= (word_len - 1) << 7;
683
684 /* set chipselect polarity; manage with FORCE */
685 if (!(spi->mode & SPI_CS_HIGH))
686 l |= OMAP2_MCSPI_CHCONF_EPOL; /* active-low; normal */
687 else
688 l &= ~OMAP2_MCSPI_CHCONF_EPOL;
689
690 /* set clock divisor */
691 l &= ~OMAP2_MCSPI_CHCONF_CLKD_MASK;
692 l |= div << 2;
693
694 /* set SPI mode 0..3 */
695 if (spi->mode & SPI_CPOL)
696 l |= OMAP2_MCSPI_CHCONF_POL;
697 else
698 l &= ~OMAP2_MCSPI_CHCONF_POL;
699 if (spi->mode & SPI_CPHA)
700 l |= OMAP2_MCSPI_CHCONF_PHA;
701 else
702 l &= ~OMAP2_MCSPI_CHCONF_PHA;
703
Hemanth Va41ae1a2009-09-22 16:46:16 -0700704 mcspi_write_chconf0(spi, l);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700705
706 dev_dbg(&spi->dev, "setup: speed %d, sample %s edge, clk %s\n",
Hannu Heikkinen57d9c102011-02-24 21:31:33 +0200707 OMAP2_MCSPI_MAX_FREQ >> div,
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700708 (spi->mode & SPI_CPHA) ? "trailing" : "leading",
709 (spi->mode & SPI_CPOL) ? "inverted" : "normal");
710
711 return 0;
712}
713
714static void omap2_mcspi_dma_rx_callback(int lch, u16 ch_status, void *data)
715{
716 struct spi_device *spi = data;
717 struct omap2_mcspi *mcspi;
718 struct omap2_mcspi_dma *mcspi_dma;
719
720 mcspi = spi_master_get_devdata(spi->master);
721 mcspi_dma = &(mcspi->dma_channels[spi->chip_select]);
722
723 complete(&mcspi_dma->dma_rx_completion);
724
725 /* We must disable the DMA RX request */
726 omap2_mcspi_set_dma_req(spi, 1, 0);
727}
728
729static void omap2_mcspi_dma_tx_callback(int lch, u16 ch_status, void *data)
730{
731 struct spi_device *spi = data;
732 struct omap2_mcspi *mcspi;
733 struct omap2_mcspi_dma *mcspi_dma;
734
735 mcspi = spi_master_get_devdata(spi->master);
736 mcspi_dma = &(mcspi->dma_channels[spi->chip_select]);
737
738 complete(&mcspi_dma->dma_tx_completion);
739
740 /* We must disable the DMA TX request */
741 omap2_mcspi_set_dma_req(spi, 0, 0);
742}
743
744static int omap2_mcspi_request_dma(struct spi_device *spi)
745{
746 struct spi_master *master = spi->master;
747 struct omap2_mcspi *mcspi;
748 struct omap2_mcspi_dma *mcspi_dma;
749
750 mcspi = spi_master_get_devdata(master);
751 mcspi_dma = mcspi->dma_channels + spi->chip_select;
752
753 if (omap_request_dma(mcspi_dma->dma_rx_sync_dev, "McSPI RX",
754 omap2_mcspi_dma_rx_callback, spi,
755 &mcspi_dma->dma_rx_channel)) {
756 dev_err(&spi->dev, "no RX DMA channel for McSPI\n");
757 return -EAGAIN;
758 }
759
760 if (omap_request_dma(mcspi_dma->dma_tx_sync_dev, "McSPI TX",
761 omap2_mcspi_dma_tx_callback, spi,
762 &mcspi_dma->dma_tx_channel)) {
763 omap_free_dma(mcspi_dma->dma_rx_channel);
764 mcspi_dma->dma_rx_channel = -1;
765 dev_err(&spi->dev, "no TX DMA channel for McSPI\n");
766 return -EAGAIN;
767 }
768
769 init_completion(&mcspi_dma->dma_rx_completion);
770 init_completion(&mcspi_dma->dma_tx_completion);
771
772 return 0;
773}
774
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700775static int omap2_mcspi_setup(struct spi_device *spi)
776{
777 int ret;
Benoit Cousson1bd897f82012-03-26 15:32:33 +0530778 struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master);
779 struct omap2_mcspi_regs *ctx = &mcspi->ctx;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700780 struct omap2_mcspi_dma *mcspi_dma;
781 struct omap2_mcspi_cs *cs = spi->controller_state;
782
David Brownell7d077192009-06-17 16:26:03 -0700783 if (spi->bits_per_word < 4 || spi->bits_per_word > 32) {
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700784 dev_dbg(&spi->dev, "setup: unsupported %d bit words\n",
785 spi->bits_per_word);
786 return -EINVAL;
787 }
788
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700789 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
790
791 if (!cs) {
Shubhrajyoti D1a77b122012-03-17 12:44:01 +0530792 cs = devm_kzalloc(&spi->dev , sizeof *cs, GFP_KERNEL);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700793 if (!cs)
794 return -ENOMEM;
795 cs->base = mcspi->base + spi->chip_select * 0x14;
Russell Kinge5480b732008-09-01 21:51:50 +0100796 cs->phys = mcspi->phys + spi->chip_select * 0x14;
Hemanth Va41ae1a2009-09-22 16:46:16 -0700797 cs->chconf0 = 0;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700798 spi->controller_state = cs;
Tero Kristo89c05372009-09-22 16:46:17 -0700799 /* Link this to context save list */
Benoit Cousson1bd897f82012-03-26 15:32:33 +0530800 list_add_tail(&cs->node, &ctx->cs);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700801 }
802
803 if (mcspi_dma->dma_rx_channel == -1
804 || mcspi_dma->dma_tx_channel == -1) {
805 ret = omap2_mcspi_request_dma(spi);
806 if (ret < 0)
807 return ret;
808 }
809
Govindraj.R1f1a4382011-02-02 17:52:15 +0530810 ret = omap2_mcspi_enable_clocks(mcspi);
811 if (ret < 0)
812 return ret;
Hemanth Va41ae1a2009-09-22 16:46:16 -0700813
Kyungmin Park86eeb6f2007-10-16 01:27:45 -0700814 ret = omap2_mcspi_setup_transfer(spi, NULL);
Hemanth Va41ae1a2009-09-22 16:46:16 -0700815 omap2_mcspi_disable_clocks(mcspi);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700816
817 return ret;
818}
819
820static void omap2_mcspi_cleanup(struct spi_device *spi)
821{
822 struct omap2_mcspi *mcspi;
823 struct omap2_mcspi_dma *mcspi_dma;
Tero Kristo89c05372009-09-22 16:46:17 -0700824 struct omap2_mcspi_cs *cs;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700825
826 mcspi = spi_master_get_devdata(spi->master);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700827
Scott Ellis5e774942010-03-10 14:22:45 -0700828 if (spi->controller_state) {
829 /* Unlink controller state from context save list */
830 cs = spi->controller_state;
831 list_del(&cs->node);
Tero Kristo89c05372009-09-22 16:46:17 -0700832
Scott Ellis5e774942010-03-10 14:22:45 -0700833 }
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700834
Scott Ellis99f1a432010-05-24 14:20:27 +0000835 if (spi->chip_select < spi->master->num_chipselect) {
836 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
837
838 if (mcspi_dma->dma_rx_channel != -1) {
839 omap_free_dma(mcspi_dma->dma_rx_channel);
840 mcspi_dma->dma_rx_channel = -1;
841 }
842 if (mcspi_dma->dma_tx_channel != -1) {
843 omap_free_dma(mcspi_dma->dma_tx_channel);
844 mcspi_dma->dma_tx_channel = -1;
845 }
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700846 }
847}
848
849static void omap2_mcspi_work(struct work_struct *work)
850{
851 struct omap2_mcspi *mcspi;
852
853 mcspi = container_of(work, struct omap2_mcspi, work);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700854
Govindraj.R1f1a4382011-02-02 17:52:15 +0530855 if (omap2_mcspi_enable_clocks(mcspi) < 0)
856 return;
857
858 spin_lock_irq(&mcspi->lock);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700859
860 /* We only enable one channel at a time -- the one whose message is
861 * at the head of the queue -- although this controller would gladly
862 * arbitrate among multiple channels. This corresponds to "single
863 * channel" master mode. As a side effect, we need to manage the
864 * chipselect with the FORCE bit ... CS != channel enable.
865 */
866 while (!list_empty(&mcspi->msg_queue)) {
867 struct spi_message *m;
868 struct spi_device *spi;
869 struct spi_transfer *t = NULL;
870 int cs_active = 0;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700871 struct omap2_mcspi_cs *cs;
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000872 struct omap2_mcspi_device_config *cd;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700873 int par_override = 0;
874 int status = 0;
875 u32 chconf;
876
877 m = container_of(mcspi->msg_queue.next, struct spi_message,
878 queue);
879
880 list_del_init(&m->queue);
881 spin_unlock_irq(&mcspi->lock);
882
883 spi = m->spi;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700884 cs = spi->controller_state;
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000885 cd = spi->controller_data;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700886
887 omap2_mcspi_set_enable(spi, 1);
888 list_for_each_entry(t, &m->transfers, transfer_list) {
889 if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
890 status = -EINVAL;
891 break;
892 }
893 if (par_override || t->speed_hz || t->bits_per_word) {
894 par_override = 1;
895 status = omap2_mcspi_setup_transfer(spi, t);
896 if (status < 0)
897 break;
898 if (!t->speed_hz && !t->bits_per_word)
899 par_override = 0;
900 }
901
902 if (!cs_active) {
903 omap2_mcspi_force_cs(spi, 1);
904 cs_active = 1;
905 }
906
Hemanth Va41ae1a2009-09-22 16:46:16 -0700907 chconf = mcspi_cached_chconf0(spi);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700908 chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000909 chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
910
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700911 if (t->tx_buf == NULL)
912 chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
913 else if (t->rx_buf == NULL)
914 chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
Roman Tereshonkov4743a0f2010-04-13 10:41:51 +0000915
916 if (cd && cd->turbo_mode && t->tx_buf == NULL) {
917 /* Turbo mode is for more than one word */
918 if (t->len > ((cs->word_len + 7) >> 3))
919 chconf |= OMAP2_MCSPI_CHCONF_TURBO;
920 }
921
Hemanth Va41ae1a2009-09-22 16:46:16 -0700922 mcspi_write_chconf0(spi, chconf);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700923
924 if (t->len) {
925 unsigned count;
926
927 /* RX_ONLY mode needs dummy data in TX reg */
928 if (t->tx_buf == NULL)
929 __raw_writel(0, cs->base
930 + OMAP2_MCSPI_TX0);
931
932 if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES)
933 count = omap2_mcspi_txrx_dma(spi, t);
934 else
935 count = omap2_mcspi_txrx_pio(spi, t);
936 m->actual_length += count;
937
938 if (count != t->len) {
939 status = -EIO;
940 break;
941 }
942 }
943
944 if (t->delay_usecs)
945 udelay(t->delay_usecs);
946
947 /* ignore the "leave it on after last xfer" hint */
948 if (t->cs_change) {
949 omap2_mcspi_force_cs(spi, 0);
950 cs_active = 0;
951 }
952 }
953
954 /* Restore defaults if they were overriden */
955 if (par_override) {
956 par_override = 0;
957 status = omap2_mcspi_setup_transfer(spi, NULL);
958 }
959
960 if (cs_active)
961 omap2_mcspi_force_cs(spi, 0);
962
963 omap2_mcspi_set_enable(spi, 0);
964
965 m->status = status;
966 m->complete(m->context);
967
968 spin_lock_irq(&mcspi->lock);
969 }
970
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700971 spin_unlock_irq(&mcspi->lock);
Govindraj.R1f1a4382011-02-02 17:52:15 +0530972
973 omap2_mcspi_disable_clocks(mcspi);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -0700974}
975
976static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
977{
978 struct omap2_mcspi *mcspi;
979 unsigned long flags;
980 struct spi_transfer *t;
981
982 m->actual_length = 0;
983 m->status = 0;
984
985 /* reject invalid messages and transfers */
986 if (list_empty(&m->transfers) || !m->complete)
987 return -EINVAL;
988 list_for_each_entry(t, &m->transfers, transfer_list) {
989 const void *tx_buf = t->tx_buf;
990 void *rx_buf = t->rx_buf;
991 unsigned len = t->len;
992
993 if (t->speed_hz > OMAP2_MCSPI_MAX_FREQ
994 || (len && !(rx_buf || tx_buf))
995 || (t->bits_per_word &&
996 ( t->bits_per_word < 4
997 || t->bits_per_word > 32))) {
998 dev_dbg(&spi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
999 t->speed_hz,
1000 len,
1001 tx_buf ? "tx" : "",
1002 rx_buf ? "rx" : "",
1003 t->bits_per_word);
1004 return -EINVAL;
1005 }
Hannu Heikkinen57d9c102011-02-24 21:31:33 +02001006 if (t->speed_hz && t->speed_hz < (OMAP2_MCSPI_MAX_FREQ >> 15)) {
1007 dev_dbg(&spi->dev, "speed_hz %d below minimum %d Hz\n",
1008 t->speed_hz,
1009 OMAP2_MCSPI_MAX_FREQ >> 15);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001010 return -EINVAL;
1011 }
1012
1013 if (m->is_dma_mapped || len < DMA_MIN_BYTES)
1014 continue;
1015
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001016 if (tx_buf != NULL) {
1017 t->tx_dma = dma_map_single(&spi->dev, (void *) tx_buf,
1018 len, DMA_TO_DEVICE);
FUJITA Tomonori8d8bb392008-07-25 19:44:49 -07001019 if (dma_mapping_error(&spi->dev, t->tx_dma)) {
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001020 dev_dbg(&spi->dev, "dma %cX %d bytes error\n",
1021 'T', len);
1022 return -EINVAL;
1023 }
1024 }
1025 if (rx_buf != NULL) {
1026 t->rx_dma = dma_map_single(&spi->dev, rx_buf, t->len,
1027 DMA_FROM_DEVICE);
FUJITA Tomonori8d8bb392008-07-25 19:44:49 -07001028 if (dma_mapping_error(&spi->dev, t->rx_dma)) {
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001029 dev_dbg(&spi->dev, "dma %cX %d bytes error\n",
1030 'R', len);
1031 if (tx_buf != NULL)
Russell King - ARM Linux07fe0352011-01-07 15:49:20 +00001032 dma_unmap_single(&spi->dev, t->tx_dma,
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001033 len, DMA_TO_DEVICE);
1034 return -EINVAL;
1035 }
1036 }
1037 }
1038
1039 mcspi = spi_master_get_devdata(spi->master);
1040
1041 spin_lock_irqsave(&mcspi->lock, flags);
1042 list_add_tail(&m->queue, &mcspi->msg_queue);
Shubhrajyoti D2856ac12011-10-28 17:14:17 +05301043 queue_work(mcspi->wq, &mcspi->work);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001044 spin_unlock_irqrestore(&mcspi->lock, flags);
1045
1046 return 0;
1047}
1048
Govindraj.R1f1a4382011-02-02 17:52:15 +05301049static int __init omap2_mcspi_master_setup(struct omap2_mcspi *mcspi)
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001050{
1051 struct spi_master *master = mcspi->master;
Benoit Cousson1bd897f82012-03-26 15:32:33 +05301052 struct omap2_mcspi_regs *ctx = &mcspi->ctx;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001053 u32 tmp;
Benoit Cousson1bd897f82012-03-26 15:32:33 +05301054 int ret = 0;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001055
Govindraj.R1f1a4382011-02-02 17:52:15 +05301056 ret = omap2_mcspi_enable_clocks(mcspi);
1057 if (ret < 0)
1058 return ret;
Jouni Hoganderddb22192009-07-29 15:02:11 -07001059
Hemanth Va41ae1a2009-09-22 16:46:16 -07001060 tmp = OMAP2_MCSPI_WAKEUPENABLE_WKEN;
1061 mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE, tmp);
Benoit Cousson1bd897f82012-03-26 15:32:33 +05301062 ctx->wakeupenable = tmp;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001063
1064 omap2_mcspi_set_master_mode(master);
Hemanth Va41ae1a2009-09-22 16:46:16 -07001065 omap2_mcspi_disable_clocks(mcspi);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001066 return 0;
1067}
1068
Govindraj.R1f1a4382011-02-02 17:52:15 +05301069static int omap_mcspi_runtime_resume(struct device *dev)
1070{
1071 struct omap2_mcspi *mcspi;
1072 struct spi_master *master;
1073
1074 master = dev_get_drvdata(dev);
1075 mcspi = spi_master_get_devdata(master);
1076 omap2_mcspi_restore_ctx(mcspi);
1077
1078 return 0;
1079}
1080
Benoit Coussond5a80032012-02-15 18:37:34 +01001081static struct omap2_mcspi_platform_config omap2_pdata = {
1082 .regs_offset = 0,
1083};
1084
1085static struct omap2_mcspi_platform_config omap4_pdata = {
1086 .regs_offset = OMAP4_MCSPI_REG_OFFSET,
1087};
1088
1089static const struct of_device_id omap_mcspi_of_match[] = {
1090 {
1091 .compatible = "ti,omap2-mcspi",
1092 .data = &omap2_pdata,
1093 },
1094 {
1095 .compatible = "ti,omap4-mcspi",
1096 .data = &omap4_pdata,
1097 },
1098 { },
1099};
1100MODULE_DEVICE_TABLE(of, omap_mcspi_of_match);
Girishccc7bae2008-02-06 01:38:16 -08001101
Felipe Balbi7d6b6d82012-03-14 11:18:30 +02001102static int __devinit omap2_mcspi_probe(struct platform_device *pdev)
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001103{
1104 struct spi_master *master;
Benoit Coussond5a80032012-02-15 18:37:34 +01001105 struct omap2_mcspi_platform_config *pdata;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001106 struct omap2_mcspi *mcspi;
1107 struct resource *r;
1108 int status = 0, i;
Benoit Coussond5a80032012-02-15 18:37:34 +01001109 u32 regs_offset = 0;
1110 static int bus_num = 1;
1111 struct device_node *node = pdev->dev.of_node;
1112 const struct of_device_id *match;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001113
1114 master = spi_alloc_master(&pdev->dev, sizeof *mcspi);
1115 if (master == NULL) {
1116 dev_dbg(&pdev->dev, "master allocation failed\n");
1117 return -ENOMEM;
1118 }
1119
David Brownelle7db06b2009-06-17 16:26:04 -07001120 /* the spi->mode bits understood by this driver: */
1121 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1122
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001123 master->setup = omap2_mcspi_setup;
1124 master->transfer = omap2_mcspi_transfer;
1125 master->cleanup = omap2_mcspi_cleanup;
Benoit Coussond5a80032012-02-15 18:37:34 +01001126 master->dev.of_node = node;
1127
1128 match = of_match_device(omap_mcspi_of_match, &pdev->dev);
1129 if (match) {
1130 u32 num_cs = 1; /* default number of chipselect */
1131 pdata = match->data;
1132
1133 of_property_read_u32(node, "ti,spi-num-cs", &num_cs);
1134 master->num_chipselect = num_cs;
1135 master->bus_num = bus_num++;
1136 } else {
1137 pdata = pdev->dev.platform_data;
1138 master->num_chipselect = pdata->num_cs;
1139 if (pdev->id != -1)
1140 master->bus_num = pdev->id;
1141 }
1142 regs_offset = pdata->regs_offset;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001143
1144 dev_set_drvdata(&pdev->dev, master);
1145
1146 mcspi = spi_master_get_devdata(master);
1147 mcspi->master = master;
1148
Benoit Cousson1bd897f82012-03-26 15:32:33 +05301149 mcspi->wq = alloc_workqueue(dev_name(&pdev->dev), WQ_MEM_RECLAIM, 1);
Shubhrajyoti D2856ac12011-10-28 17:14:17 +05301150 if (mcspi->wq == NULL) {
1151 status = -ENOMEM;
Shubhrajyoti D39f1b562011-10-28 17:14:19 +05301152 goto free_master;
Shubhrajyoti D2856ac12011-10-28 17:14:17 +05301153 }
1154
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001155 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1156 if (r == NULL) {
1157 status = -ENODEV;
Shubhrajyoti D39f1b562011-10-28 17:14:19 +05301158 goto free_master;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001159 }
Shubhrajyoti D1458d162011-10-24 15:54:24 +05301160
Benoit Coussond5a80032012-02-15 18:37:34 +01001161 r->start += regs_offset;
1162 r->end += regs_offset;
Shubhrajyoti D1458d162011-10-24 15:54:24 +05301163 mcspi->phys = r->start;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001164
Shubhrajyoti D1a77b122012-03-17 12:44:01 +05301165 mcspi->base = devm_request_and_ioremap(&pdev->dev, r);
Russell King55c381e2008-09-04 14:07:22 +01001166 if (!mcspi->base) {
1167 dev_dbg(&pdev->dev, "can't ioremap MCSPI\n");
1168 status = -ENOMEM;
Shubhrajyoti D1a77b122012-03-17 12:44:01 +05301169 goto free_master;
Russell King55c381e2008-09-04 14:07:22 +01001170 }
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001171
Govindraj.R1f1a4382011-02-02 17:52:15 +05301172 mcspi->dev = &pdev->dev;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001173 INIT_WORK(&mcspi->work, omap2_mcspi_work);
1174
1175 spin_lock_init(&mcspi->lock);
1176 INIT_LIST_HEAD(&mcspi->msg_queue);
Benoit Cousson1bd897f82012-03-26 15:32:33 +05301177 INIT_LIST_HEAD(&mcspi->ctx.cs);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001178
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001179 mcspi->dma_channels = kcalloc(master->num_chipselect,
1180 sizeof(struct omap2_mcspi_dma),
1181 GFP_KERNEL);
1182
1183 if (mcspi->dma_channels == NULL)
Shubhrajyoti D1a77b122012-03-17 12:44:01 +05301184 goto free_master;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001185
Charulatha V1a5d8192011-02-02 17:52:14 +05301186 for (i = 0; i < master->num_chipselect; i++) {
1187 char dma_ch_name[14];
1188 struct resource *dma_res;
1189
1190 sprintf(dma_ch_name, "rx%d", i);
1191 dma_res = platform_get_resource_byname(pdev, IORESOURCE_DMA,
1192 dma_ch_name);
1193 if (!dma_res) {
1194 dev_dbg(&pdev->dev, "cannot get DMA RX channel\n");
1195 status = -ENODEV;
1196 break;
1197 }
1198
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001199 mcspi->dma_channels[i].dma_rx_channel = -1;
Charulatha V1a5d8192011-02-02 17:52:14 +05301200 mcspi->dma_channels[i].dma_rx_sync_dev = dma_res->start;
1201 sprintf(dma_ch_name, "tx%d", i);
1202 dma_res = platform_get_resource_byname(pdev, IORESOURCE_DMA,
1203 dma_ch_name);
1204 if (!dma_res) {
1205 dev_dbg(&pdev->dev, "cannot get DMA TX channel\n");
1206 status = -ENODEV;
1207 break;
1208 }
1209
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001210 mcspi->dma_channels[i].dma_tx_channel = -1;
Charulatha V1a5d8192011-02-02 17:52:14 +05301211 mcspi->dma_channels[i].dma_tx_sync_dev = dma_res->start;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001212 }
1213
Shubhrajyoti D39f1b562011-10-28 17:14:19 +05301214 if (status < 0)
1215 goto dma_chnl_free;
1216
Shubhrajyoti D27b52842012-03-26 17:04:22 +05301217 pm_runtime_use_autosuspend(&pdev->dev);
1218 pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
Govindraj.R1f1a4382011-02-02 17:52:15 +05301219 pm_runtime_enable(&pdev->dev);
1220
1221 if (status || omap2_mcspi_master_setup(mcspi) < 0)
Shubhrajyoti D39f1b562011-10-28 17:14:19 +05301222 goto disable_pm;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001223
1224 status = spi_register_master(master);
1225 if (status < 0)
Shubhrajyoti D39f1b562011-10-28 17:14:19 +05301226 goto err_spi_register;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001227
1228 return status;
1229
Shubhrajyoti D39f1b562011-10-28 17:14:19 +05301230err_spi_register:
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001231 spi_master_put(master);
Shubhrajyoti D39f1b562011-10-28 17:14:19 +05301232disable_pm:
Shubhrajyoti D751c9252011-10-28 17:14:18 +05301233 pm_runtime_disable(&pdev->dev);
Shubhrajyoti D39f1b562011-10-28 17:14:19 +05301234dma_chnl_free:
Govindraj.R1f1a4382011-02-02 17:52:15 +05301235 kfree(mcspi->dma_channels);
Shubhrajyoti D39f1b562011-10-28 17:14:19 +05301236free_master:
1237 kfree(master);
1238 platform_set_drvdata(pdev, NULL);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001239 return status;
1240}
1241
Felipe Balbi7d6b6d82012-03-14 11:18:30 +02001242static int __devexit omap2_mcspi_remove(struct platform_device *pdev)
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001243{
1244 struct spi_master *master;
1245 struct omap2_mcspi *mcspi;
1246 struct omap2_mcspi_dma *dma_channels;
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001247
1248 master = dev_get_drvdata(&pdev->dev);
1249 mcspi = spi_master_get_devdata(master);
1250 dma_channels = mcspi->dma_channels;
1251
Govindraj.R1f1a4382011-02-02 17:52:15 +05301252 omap2_mcspi_disable_clocks(mcspi);
Shubhrajyoti D751c9252011-10-28 17:14:18 +05301253 pm_runtime_disable(&pdev->dev);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001254
1255 spi_unregister_master(master);
1256 kfree(dma_channels);
Shubhrajyoti D2856ac12011-10-28 17:14:17 +05301257 destroy_workqueue(mcspi->wq);
Shubhrajyoti D39f1b562011-10-28 17:14:19 +05301258 platform_set_drvdata(pdev, NULL);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001259
1260 return 0;
1261}
1262
Kay Sievers7e38c3c2008-04-10 21:29:20 -07001263/* work with hotplug and coldplug */
1264MODULE_ALIAS("platform:omap2_mcspi");
1265
Gregory CLEMENT42ce7fd2010-12-29 11:52:53 +01001266#ifdef CONFIG_SUSPEND
1267/*
1268 * When SPI wake up from off-mode, CS is in activate state. If it was in
1269 * unactive state when driver was suspend, then force it to unactive state at
1270 * wake up.
1271 */
1272static int omap2_mcspi_resume(struct device *dev)
1273{
1274 struct spi_master *master = dev_get_drvdata(dev);
1275 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
Benoit Cousson1bd897f82012-03-26 15:32:33 +05301276 struct omap2_mcspi_regs *ctx = &mcspi->ctx;
1277 struct omap2_mcspi_cs *cs;
Gregory CLEMENT42ce7fd2010-12-29 11:52:53 +01001278
1279 omap2_mcspi_enable_clocks(mcspi);
Benoit Cousson1bd897f82012-03-26 15:32:33 +05301280 list_for_each_entry(cs, &ctx->cs, node) {
Gregory CLEMENT42ce7fd2010-12-29 11:52:53 +01001281 if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE) == 0) {
Gregory CLEMENT42ce7fd2010-12-29 11:52:53 +01001282 /*
1283 * We need to toggle CS state for OMAP take this
1284 * change in account.
1285 */
1286 MOD_REG_BIT(cs->chconf0, OMAP2_MCSPI_CHCONF_FORCE, 1);
1287 __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
1288 MOD_REG_BIT(cs->chconf0, OMAP2_MCSPI_CHCONF_FORCE, 0);
1289 __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
1290 }
1291 }
1292 omap2_mcspi_disable_clocks(mcspi);
1293 return 0;
1294}
1295#else
1296#define omap2_mcspi_resume NULL
1297#endif
1298
1299static const struct dev_pm_ops omap2_mcspi_pm_ops = {
1300 .resume = omap2_mcspi_resume,
Govindraj.R1f1a4382011-02-02 17:52:15 +05301301 .runtime_resume = omap_mcspi_runtime_resume,
Gregory CLEMENT42ce7fd2010-12-29 11:52:53 +01001302};
1303
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001304static struct platform_driver omap2_mcspi_driver = {
1305 .driver = {
1306 .name = "omap2_mcspi",
1307 .owner = THIS_MODULE,
Benoit Coussond5a80032012-02-15 18:37:34 +01001308 .pm = &omap2_mcspi_pm_ops,
1309 .of_match_table = omap_mcspi_of_match,
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001310 },
Felipe Balbi7d6b6d82012-03-14 11:18:30 +02001311 .probe = omap2_mcspi_probe,
1312 .remove = __devexit_p(omap2_mcspi_remove),
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001313};
1314
Felipe Balbi9fdca9d2012-03-14 11:18:31 +02001315module_platform_driver(omap2_mcspi_driver);
Samuel Ortizccdc7bf2007-07-17 04:04:13 -07001316MODULE_LICENSE("GPL");