2 * OMAP2 McSPI controller driver
4 * Copyright (C) 2005, 2006 Nokia Corporation
5 * Author: Samuel Ortiz <samuel.ortiz@nokia.com> and
6 * Juha Yrjölä <juha.yrjola@nokia.com>
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.
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.
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
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>
36 #include <linux/spi/spi.h>
39 #include <plat/clock.h>
42 #define OMAP2_MCSPI_MAX_FREQ 48000000
44 /* OMAP2 has 3 SPI controllers, while OMAP3 has 4 */
45 #define OMAP2_MCSPI_MAX_CTRL 4
47 #define OMAP2_MCSPI_REVISION 0x00
48 #define OMAP2_MCSPI_SYSCONFIG 0x10
49 #define OMAP2_MCSPI_SYSSTATUS 0x14
50 #define OMAP2_MCSPI_IRQSTATUS 0x18
51 #define OMAP2_MCSPI_IRQENABLE 0x1c
52 #define OMAP2_MCSPI_WAKEUPENABLE 0x20
53 #define OMAP2_MCSPI_SYST 0x24
54 #define OMAP2_MCSPI_MODULCTRL 0x28
56 /* per-channel banks, 0x14 bytes each, first is: */
57 #define OMAP2_MCSPI_CHCONF0 0x2c
58 #define OMAP2_MCSPI_CHSTAT0 0x30
59 #define OMAP2_MCSPI_CHCTRL0 0x34
60 #define OMAP2_MCSPI_TX0 0x38
61 #define OMAP2_MCSPI_RX0 0x3c
63 /* per-register bitmasks: */
65 #define OMAP2_MCSPI_SYSCONFIG_SMARTIDLE BIT(4)
66 #define OMAP2_MCSPI_SYSCONFIG_ENAWAKEUP BIT(2)
67 #define OMAP2_MCSPI_SYSCONFIG_AUTOIDLE BIT(0)
68 #define OMAP2_MCSPI_SYSCONFIG_SOFTRESET BIT(1)
70 #define OMAP2_MCSPI_SYSSTATUS_RESETDONE BIT(0)
72 #define OMAP2_MCSPI_MODULCTRL_SINGLE BIT(0)
73 #define OMAP2_MCSPI_MODULCTRL_MS BIT(2)
74 #define OMAP2_MCSPI_MODULCTRL_STEST BIT(3)
76 #define OMAP2_MCSPI_CHCONF_PHA BIT(0)
77 #define OMAP2_MCSPI_CHCONF_POL BIT(1)
78 #define OMAP2_MCSPI_CHCONF_CLKD_MASK (0x0f << 2)
79 #define OMAP2_MCSPI_CHCONF_EPOL BIT(6)
80 #define OMAP2_MCSPI_CHCONF_WL_MASK (0x1f << 7)
81 #define OMAP2_MCSPI_CHCONF_TRM_RX_ONLY BIT(12)
82 #define OMAP2_MCSPI_CHCONF_TRM_TX_ONLY BIT(13)
83 #define OMAP2_MCSPI_CHCONF_TRM_MASK (0x03 << 12)
84 #define OMAP2_MCSPI_CHCONF_DMAW BIT(14)
85 #define OMAP2_MCSPI_CHCONF_DMAR BIT(15)
86 #define OMAP2_MCSPI_CHCONF_DPE0 BIT(16)
87 #define OMAP2_MCSPI_CHCONF_DPE1 BIT(17)
88 #define OMAP2_MCSPI_CHCONF_IS BIT(18)
89 #define OMAP2_MCSPI_CHCONF_TURBO BIT(19)
90 #define OMAP2_MCSPI_CHCONF_FORCE BIT(20)
92 #define OMAP2_MCSPI_CHSTAT_RXS BIT(0)
93 #define OMAP2_MCSPI_CHSTAT_TXS BIT(1)
94 #define OMAP2_MCSPI_CHSTAT_EOT BIT(2)
96 #define OMAP2_MCSPI_CHCTRL_EN BIT(0)
98 #define OMAP2_MCSPI_WAKEUPENABLE_WKEN BIT(0)
100 /* We have 2 DMA channels per CS, one for RX and one for TX */
101 struct omap2_mcspi_dma {
108 struct completion dma_tx_completion;
109 struct completion dma_rx_completion;
112 /* use PIO for small transfers, avoiding DMA setup/teardown overhead and
113 * cache operations; better heuristics consider wordsize and bitrate.
115 #define DMA_MIN_BYTES 8
119 struct work_struct work;
120 /* lock protects queue and registers */
122 struct list_head msg_queue;
123 struct spi_master *master;
126 /* Virtual base address of the controller */
129 /* SPI1 has 4 channels, while SPI2 has 2 */
130 struct omap2_mcspi_dma *dma_channels;
133 struct omap2_mcspi_cs {
137 struct list_head node;
138 /* Context save and restore shadow register */
142 /* used for context save and restore, structure members to be updated whenever
143 * corresponding registers are modified.
145 struct omap2_mcspi_regs {
152 static struct omap2_mcspi_regs omap2_mcspi_ctx[OMAP2_MCSPI_MAX_CTRL];
154 static struct workqueue_struct *omap2_mcspi_wq;
156 #define MOD_REG_BIT(val, mask, set) do { \
163 static inline void mcspi_write_reg(struct spi_master *master,
166 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
168 __raw_writel(val, mcspi->base + idx);
171 static inline u32 mcspi_read_reg(struct spi_master *master, int idx)
173 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
175 return __raw_readl(mcspi->base + idx);
178 static inline void mcspi_write_cs_reg(const struct spi_device *spi,
181 struct omap2_mcspi_cs *cs = spi->controller_state;
183 __raw_writel(val, cs->base + idx);
186 static inline u32 mcspi_read_cs_reg(const struct spi_device *spi, int idx)
188 struct omap2_mcspi_cs *cs = spi->controller_state;
190 return __raw_readl(cs->base + idx);
193 static inline u32 mcspi_cached_chconf0(const struct spi_device *spi)
195 struct omap2_mcspi_cs *cs = spi->controller_state;
200 static inline void mcspi_write_chconf0(const struct spi_device *spi, u32 val)
202 struct omap2_mcspi_cs *cs = spi->controller_state;
205 mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, val);
208 static void omap2_mcspi_set_dma_req(const struct spi_device *spi,
209 int is_read, int enable)
213 l = mcspi_cached_chconf0(spi);
215 if (is_read) /* 1 is read, 0 write */
216 rw = OMAP2_MCSPI_CHCONF_DMAR;
218 rw = OMAP2_MCSPI_CHCONF_DMAW;
220 MOD_REG_BIT(l, rw, enable);
221 mcspi_write_chconf0(spi, l);
224 static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable)
228 l = enable ? OMAP2_MCSPI_CHCTRL_EN : 0;
229 mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, l);
232 static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active)
236 l = mcspi_cached_chconf0(spi);
237 MOD_REG_BIT(l, OMAP2_MCSPI_CHCONF_FORCE, cs_active);
238 mcspi_write_chconf0(spi, l);
241 static void omap2_mcspi_set_master_mode(struct spi_master *master)
245 /* setup when switching from (reset default) slave mode
246 * to single-channel master mode
248 l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL);
249 MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_STEST, 0);
250 MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_MS, 0);
251 MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_SINGLE, 1);
252 mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l);
254 omap2_mcspi_ctx[master->bus_num - 1].modulctrl = l;
257 static void omap2_mcspi_restore_ctx(struct omap2_mcspi *mcspi)
259 struct spi_master *spi_cntrl;
260 struct omap2_mcspi_cs *cs;
261 spi_cntrl = mcspi->master;
263 /* McSPI: context restore */
264 mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_MODULCTRL,
265 omap2_mcspi_ctx[spi_cntrl->bus_num - 1].modulctrl);
267 mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_SYSCONFIG,
268 omap2_mcspi_ctx[spi_cntrl->bus_num - 1].sysconfig);
270 mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_WAKEUPENABLE,
271 omap2_mcspi_ctx[spi_cntrl->bus_num - 1].wakeupenable);
273 list_for_each_entry(cs, &omap2_mcspi_ctx[spi_cntrl->bus_num - 1].cs,
275 __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
277 static void omap2_mcspi_disable_clocks(struct omap2_mcspi *mcspi)
279 clk_disable(mcspi->ick);
280 clk_disable(mcspi->fck);
283 static int omap2_mcspi_enable_clocks(struct omap2_mcspi *mcspi)
285 if (clk_enable(mcspi->ick))
287 if (clk_enable(mcspi->fck))
290 omap2_mcspi_restore_ctx(mcspi);
296 omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
298 struct omap2_mcspi *mcspi;
299 struct omap2_mcspi_cs *cs = spi->controller_state;
300 struct omap2_mcspi_dma *mcspi_dma;
301 unsigned int count, c;
302 unsigned long base, tx_reg, rx_reg;
303 int word_len, data_type, element_count;
307 mcspi = spi_master_get_devdata(spi->master);
308 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
312 word_len = cs->word_len;
315 tx_reg = base + OMAP2_MCSPI_TX0;
316 rx_reg = base + OMAP2_MCSPI_RX0;
321 data_type = OMAP_DMA_DATA_TYPE_S8;
322 element_count = count;
323 } else if (word_len <= 16) {
324 data_type = OMAP_DMA_DATA_TYPE_S16;
325 element_count = count >> 1;
326 } else /* word_len <= 32 */ {
327 data_type = OMAP_DMA_DATA_TYPE_S32;
328 element_count = count >> 2;
332 omap_set_dma_transfer_params(mcspi_dma->dma_tx_channel,
333 data_type, element_count, 1,
334 OMAP_DMA_SYNC_ELEMENT,
335 mcspi_dma->dma_tx_sync_dev, 0);
337 omap_set_dma_dest_params(mcspi_dma->dma_tx_channel, 0,
338 OMAP_DMA_AMODE_CONSTANT,
341 omap_set_dma_src_params(mcspi_dma->dma_tx_channel, 0,
342 OMAP_DMA_AMODE_POST_INC,
347 omap_set_dma_transfer_params(mcspi_dma->dma_rx_channel,
348 data_type, element_count - 1, 1,
349 OMAP_DMA_SYNC_ELEMENT,
350 mcspi_dma->dma_rx_sync_dev, 1);
352 omap_set_dma_src_params(mcspi_dma->dma_rx_channel, 0,
353 OMAP_DMA_AMODE_CONSTANT,
356 omap_set_dma_dest_params(mcspi_dma->dma_rx_channel, 0,
357 OMAP_DMA_AMODE_POST_INC,
362 omap_start_dma(mcspi_dma->dma_tx_channel);
363 omap2_mcspi_set_dma_req(spi, 0, 1);
367 omap_start_dma(mcspi_dma->dma_rx_channel);
368 omap2_mcspi_set_dma_req(spi, 1, 1);
372 wait_for_completion(&mcspi_dma->dma_tx_completion);
373 dma_unmap_single(NULL, xfer->tx_dma, count, DMA_TO_DEVICE);
377 wait_for_completion(&mcspi_dma->dma_rx_completion);
378 dma_unmap_single(NULL, xfer->rx_dma, count, DMA_FROM_DEVICE);
379 omap2_mcspi_set_enable(spi, 0);
380 if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
381 & OMAP2_MCSPI_CHSTAT_RXS)) {
384 w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
386 ((u8 *)xfer->rx_buf)[element_count - 1] = w;
387 else if (word_len <= 16)
388 ((u16 *)xfer->rx_buf)[element_count - 1] = w;
389 else /* word_len <= 32 */
390 ((u32 *)xfer->rx_buf)[element_count - 1] = w;
392 dev_err(&spi->dev, "DMA RX last word empty");
393 count -= (word_len <= 8) ? 1 :
394 (word_len <= 16) ? 2 :
395 /* word_len <= 32 */ 4;
397 omap2_mcspi_set_enable(spi, 1);
402 static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit)
404 unsigned long timeout;
406 timeout = jiffies + msecs_to_jiffies(1000);
407 while (!(__raw_readl(reg) & bit)) {
408 if (time_after(jiffies, timeout))
416 omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
418 struct omap2_mcspi *mcspi;
419 struct omap2_mcspi_cs *cs = spi->controller_state;
420 unsigned int count, c;
422 void __iomem *base = cs->base;
423 void __iomem *tx_reg;
424 void __iomem *rx_reg;
425 void __iomem *chstat_reg;
428 mcspi = spi_master_get_devdata(spi->master);
431 word_len = cs->word_len;
433 l = mcspi_cached_chconf0(spi);
434 l &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
436 /* We store the pre-calculated register addresses on stack to speed
437 * up the transfer loop. */
438 tx_reg = base + OMAP2_MCSPI_TX0;
439 rx_reg = base + OMAP2_MCSPI_RX0;
440 chstat_reg = base + OMAP2_MCSPI_CHSTAT0;
452 if (mcspi_wait_for_reg_bit(chstat_reg,
453 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
454 dev_err(&spi->dev, "TXS timed out\n");
458 dev_dbg(&spi->dev, "write-%d %02x\n",
461 __raw_writel(*tx++, tx_reg);
464 if (mcspi_wait_for_reg_bit(chstat_reg,
465 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
466 dev_err(&spi->dev, "RXS timed out\n");
469 /* prevent last RX_ONLY read from triggering
470 * more word i/o: switch to rx+tx
472 if (c == 0 && tx == NULL)
473 mcspi_write_chconf0(spi, l);
474 *rx++ = __raw_readl(rx_reg);
476 dev_dbg(&spi->dev, "read-%d %02x\n",
477 word_len, *(rx - 1));
481 } else if (word_len <= 16) {
490 if (mcspi_wait_for_reg_bit(chstat_reg,
491 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
492 dev_err(&spi->dev, "TXS timed out\n");
496 dev_dbg(&spi->dev, "write-%d %04x\n",
499 __raw_writel(*tx++, tx_reg);
502 if (mcspi_wait_for_reg_bit(chstat_reg,
503 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
504 dev_err(&spi->dev, "RXS timed out\n");
507 /* prevent last RX_ONLY read from triggering
508 * more word i/o: switch to rx+tx
510 if (c == 0 && tx == NULL)
511 mcspi_write_chconf0(spi, l);
512 *rx++ = __raw_readl(rx_reg);
514 dev_dbg(&spi->dev, "read-%d %04x\n",
515 word_len, *(rx - 1));
519 } else if (word_len <= 32) {
528 if (mcspi_wait_for_reg_bit(chstat_reg,
529 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
530 dev_err(&spi->dev, "TXS timed out\n");
534 dev_dbg(&spi->dev, "write-%d %04x\n",
537 __raw_writel(*tx++, tx_reg);
540 if (mcspi_wait_for_reg_bit(chstat_reg,
541 OMAP2_MCSPI_CHSTAT_RXS) < 0) {
542 dev_err(&spi->dev, "RXS timed out\n");
545 /* prevent last RX_ONLY read from triggering
546 * more word i/o: switch to rx+tx
548 if (c == 0 && tx == NULL)
549 mcspi_write_chconf0(spi, l);
550 *rx++ = __raw_readl(rx_reg);
552 dev_dbg(&spi->dev, "read-%d %04x\n",
553 word_len, *(rx - 1));
559 /* for TX_ONLY mode, be sure all words have shifted out */
560 if (xfer->rx_buf == NULL) {
561 if (mcspi_wait_for_reg_bit(chstat_reg,
562 OMAP2_MCSPI_CHSTAT_TXS) < 0) {
563 dev_err(&spi->dev, "TXS timed out\n");
564 } else if (mcspi_wait_for_reg_bit(chstat_reg,
565 OMAP2_MCSPI_CHSTAT_EOT) < 0)
566 dev_err(&spi->dev, "EOT timed out\n");
572 /* called only when no transfer is active to this device */
573 static int omap2_mcspi_setup_transfer(struct spi_device *spi,
574 struct spi_transfer *t)
576 struct omap2_mcspi_cs *cs = spi->controller_state;
577 struct omap2_mcspi *mcspi;
578 struct spi_master *spi_cntrl;
580 u8 word_len = spi->bits_per_word;
581 u32 speed_hz = spi->max_speed_hz;
583 mcspi = spi_master_get_devdata(spi->master);
584 spi_cntrl = mcspi->master;
586 if (t != NULL && t->bits_per_word)
587 word_len = t->bits_per_word;
589 cs->word_len = word_len;
591 if (t && t->speed_hz)
592 speed_hz = t->speed_hz;
595 while (div <= 15 && (OMAP2_MCSPI_MAX_FREQ / (1 << div))
601 l = mcspi_cached_chconf0(spi);
603 /* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS
604 * REVISIT: this controller could support SPI_3WIRE mode.
606 l &= ~(OMAP2_MCSPI_CHCONF_IS|OMAP2_MCSPI_CHCONF_DPE1);
607 l |= OMAP2_MCSPI_CHCONF_DPE0;
610 l &= ~OMAP2_MCSPI_CHCONF_WL_MASK;
611 l |= (word_len - 1) << 7;
613 /* set chipselect polarity; manage with FORCE */
614 if (!(spi->mode & SPI_CS_HIGH))
615 l |= OMAP2_MCSPI_CHCONF_EPOL; /* active-low; normal */
617 l &= ~OMAP2_MCSPI_CHCONF_EPOL;
619 /* set clock divisor */
620 l &= ~OMAP2_MCSPI_CHCONF_CLKD_MASK;
623 /* set SPI mode 0..3 */
624 if (spi->mode & SPI_CPOL)
625 l |= OMAP2_MCSPI_CHCONF_POL;
627 l &= ~OMAP2_MCSPI_CHCONF_POL;
628 if (spi->mode & SPI_CPHA)
629 l |= OMAP2_MCSPI_CHCONF_PHA;
631 l &= ~OMAP2_MCSPI_CHCONF_PHA;
633 mcspi_write_chconf0(spi, l);
635 dev_dbg(&spi->dev, "setup: speed %d, sample %s edge, clk %s\n",
636 OMAP2_MCSPI_MAX_FREQ / (1 << div),
637 (spi->mode & SPI_CPHA) ? "trailing" : "leading",
638 (spi->mode & SPI_CPOL) ? "inverted" : "normal");
643 static void omap2_mcspi_dma_rx_callback(int lch, u16 ch_status, void *data)
645 struct spi_device *spi = data;
646 struct omap2_mcspi *mcspi;
647 struct omap2_mcspi_dma *mcspi_dma;
649 mcspi = spi_master_get_devdata(spi->master);
650 mcspi_dma = &(mcspi->dma_channels[spi->chip_select]);
652 complete(&mcspi_dma->dma_rx_completion);
654 /* We must disable the DMA RX request */
655 omap2_mcspi_set_dma_req(spi, 1, 0);
658 static void omap2_mcspi_dma_tx_callback(int lch, u16 ch_status, void *data)
660 struct spi_device *spi = data;
661 struct omap2_mcspi *mcspi;
662 struct omap2_mcspi_dma *mcspi_dma;
664 mcspi = spi_master_get_devdata(spi->master);
665 mcspi_dma = &(mcspi->dma_channels[spi->chip_select]);
667 complete(&mcspi_dma->dma_tx_completion);
669 /* We must disable the DMA TX request */
670 omap2_mcspi_set_dma_req(spi, 0, 0);
673 static int omap2_mcspi_request_dma(struct spi_device *spi)
675 struct spi_master *master = spi->master;
676 struct omap2_mcspi *mcspi;
677 struct omap2_mcspi_dma *mcspi_dma;
679 mcspi = spi_master_get_devdata(master);
680 mcspi_dma = mcspi->dma_channels + spi->chip_select;
682 if (omap_request_dma(mcspi_dma->dma_rx_sync_dev, "McSPI RX",
683 omap2_mcspi_dma_rx_callback, spi,
684 &mcspi_dma->dma_rx_channel)) {
685 dev_err(&spi->dev, "no RX DMA channel for McSPI\n");
689 if (omap_request_dma(mcspi_dma->dma_tx_sync_dev, "McSPI TX",
690 omap2_mcspi_dma_tx_callback, spi,
691 &mcspi_dma->dma_tx_channel)) {
692 omap_free_dma(mcspi_dma->dma_rx_channel);
693 mcspi_dma->dma_rx_channel = -1;
694 dev_err(&spi->dev, "no TX DMA channel for McSPI\n");
698 init_completion(&mcspi_dma->dma_rx_completion);
699 init_completion(&mcspi_dma->dma_tx_completion);
704 static int omap2_mcspi_setup(struct spi_device *spi)
707 struct omap2_mcspi *mcspi;
708 struct omap2_mcspi_dma *mcspi_dma;
709 struct omap2_mcspi_cs *cs = spi->controller_state;
711 if (spi->bits_per_word < 4 || spi->bits_per_word > 32) {
712 dev_dbg(&spi->dev, "setup: unsupported %d bit words\n",
717 mcspi = spi_master_get_devdata(spi->master);
718 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
721 cs = kzalloc(sizeof *cs, GFP_KERNEL);
724 cs->base = mcspi->base + spi->chip_select * 0x14;
725 cs->phys = mcspi->phys + spi->chip_select * 0x14;
727 spi->controller_state = cs;
728 /* Link this to context save list */
729 list_add_tail(&cs->node,
730 &omap2_mcspi_ctx[mcspi->master->bus_num - 1].cs);
733 if (mcspi_dma->dma_rx_channel == -1
734 || mcspi_dma->dma_tx_channel == -1) {
735 ret = omap2_mcspi_request_dma(spi);
740 if (omap2_mcspi_enable_clocks(mcspi))
743 ret = omap2_mcspi_setup_transfer(spi, NULL);
744 omap2_mcspi_disable_clocks(mcspi);
749 static void omap2_mcspi_cleanup(struct spi_device *spi)
751 struct omap2_mcspi *mcspi;
752 struct omap2_mcspi_dma *mcspi_dma;
753 struct omap2_mcspi_cs *cs;
755 mcspi = spi_master_get_devdata(spi->master);
756 mcspi_dma = &mcspi->dma_channels[spi->chip_select];
758 if (spi->controller_state) {
759 /* Unlink controller state from context save list */
760 cs = spi->controller_state;
763 kfree(spi->controller_state);
766 if (mcspi_dma->dma_rx_channel != -1) {
767 omap_free_dma(mcspi_dma->dma_rx_channel);
768 mcspi_dma->dma_rx_channel = -1;
770 if (mcspi_dma->dma_tx_channel != -1) {
771 omap_free_dma(mcspi_dma->dma_tx_channel);
772 mcspi_dma->dma_tx_channel = -1;
776 static void omap2_mcspi_work(struct work_struct *work)
778 struct omap2_mcspi *mcspi;
780 mcspi = container_of(work, struct omap2_mcspi, work);
781 spin_lock_irq(&mcspi->lock);
783 if (omap2_mcspi_enable_clocks(mcspi))
786 /* We only enable one channel at a time -- the one whose message is
787 * at the head of the queue -- although this controller would gladly
788 * arbitrate among multiple channels. This corresponds to "single
789 * channel" master mode. As a side effect, we need to manage the
790 * chipselect with the FORCE bit ... CS != channel enable.
792 while (!list_empty(&mcspi->msg_queue)) {
793 struct spi_message *m;
794 struct spi_device *spi;
795 struct spi_transfer *t = NULL;
797 struct omap2_mcspi_cs *cs;
798 int par_override = 0;
802 m = container_of(mcspi->msg_queue.next, struct spi_message,
805 list_del_init(&m->queue);
806 spin_unlock_irq(&mcspi->lock);
809 cs = spi->controller_state;
811 omap2_mcspi_set_enable(spi, 1);
812 list_for_each_entry(t, &m->transfers, transfer_list) {
813 if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
817 if (par_override || t->speed_hz || t->bits_per_word) {
819 status = omap2_mcspi_setup_transfer(spi, t);
822 if (!t->speed_hz && !t->bits_per_word)
827 omap2_mcspi_force_cs(spi, 1);
831 chconf = mcspi_cached_chconf0(spi);
832 chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
833 if (t->tx_buf == NULL)
834 chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
835 else if (t->rx_buf == NULL)
836 chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
837 mcspi_write_chconf0(spi, chconf);
842 /* RX_ONLY mode needs dummy data in TX reg */
843 if (t->tx_buf == NULL)
844 __raw_writel(0, cs->base
847 if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES)
848 count = omap2_mcspi_txrx_dma(spi, t);
850 count = omap2_mcspi_txrx_pio(spi, t);
851 m->actual_length += count;
853 if (count != t->len) {
860 udelay(t->delay_usecs);
862 /* ignore the "leave it on after last xfer" hint */
864 omap2_mcspi_force_cs(spi, 0);
869 /* Restore defaults if they were overriden */
872 status = omap2_mcspi_setup_transfer(spi, NULL);
876 omap2_mcspi_force_cs(spi, 0);
878 omap2_mcspi_set_enable(spi, 0);
881 m->complete(m->context);
883 spin_lock_irq(&mcspi->lock);
886 omap2_mcspi_disable_clocks(mcspi);
889 spin_unlock_irq(&mcspi->lock);
892 static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
894 struct omap2_mcspi *mcspi;
896 struct spi_transfer *t;
898 m->actual_length = 0;
901 /* reject invalid messages and transfers */
902 if (list_empty(&m->transfers) || !m->complete)
904 list_for_each_entry(t, &m->transfers, transfer_list) {
905 const void *tx_buf = t->tx_buf;
906 void *rx_buf = t->rx_buf;
907 unsigned len = t->len;
909 if (t->speed_hz > OMAP2_MCSPI_MAX_FREQ
910 || (len && !(rx_buf || tx_buf))
911 || (t->bits_per_word &&
912 ( t->bits_per_word < 4
913 || t->bits_per_word > 32))) {
914 dev_dbg(&spi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
922 if (t->speed_hz && t->speed_hz < OMAP2_MCSPI_MAX_FREQ/(1<<16)) {
923 dev_dbg(&spi->dev, "%d Hz max exceeds %d\n",
925 OMAP2_MCSPI_MAX_FREQ/(1<<16));
929 if (m->is_dma_mapped || len < DMA_MIN_BYTES)
932 /* Do DMA mapping "early" for better error reporting and
933 * dcache use. Note that if dma_unmap_single() ever starts
934 * to do real work on ARM, we'd need to clean up mappings
935 * for previous transfers on *ALL* exits of this loop...
937 if (tx_buf != NULL) {
938 t->tx_dma = dma_map_single(&spi->dev, (void *) tx_buf,
940 if (dma_mapping_error(&spi->dev, t->tx_dma)) {
941 dev_dbg(&spi->dev, "dma %cX %d bytes error\n",
946 if (rx_buf != NULL) {
947 t->rx_dma = dma_map_single(&spi->dev, rx_buf, t->len,
949 if (dma_mapping_error(&spi->dev, t->rx_dma)) {
950 dev_dbg(&spi->dev, "dma %cX %d bytes error\n",
953 dma_unmap_single(NULL, t->tx_dma,
960 mcspi = spi_master_get_devdata(spi->master);
962 spin_lock_irqsave(&mcspi->lock, flags);
963 list_add_tail(&m->queue, &mcspi->msg_queue);
964 queue_work(omap2_mcspi_wq, &mcspi->work);
965 spin_unlock_irqrestore(&mcspi->lock, flags);
970 static int __init omap2_mcspi_reset(struct omap2_mcspi *mcspi)
972 struct spi_master *master = mcspi->master;
975 if (omap2_mcspi_enable_clocks(mcspi))
978 mcspi_write_reg(master, OMAP2_MCSPI_SYSCONFIG,
979 OMAP2_MCSPI_SYSCONFIG_SOFTRESET);
981 tmp = mcspi_read_reg(master, OMAP2_MCSPI_SYSSTATUS);
982 } while (!(tmp & OMAP2_MCSPI_SYSSTATUS_RESETDONE));
984 tmp = OMAP2_MCSPI_SYSCONFIG_AUTOIDLE |
985 OMAP2_MCSPI_SYSCONFIG_ENAWAKEUP |
986 OMAP2_MCSPI_SYSCONFIG_SMARTIDLE;
987 mcspi_write_reg(master, OMAP2_MCSPI_SYSCONFIG, tmp);
988 omap2_mcspi_ctx[master->bus_num - 1].sysconfig = tmp;
990 tmp = OMAP2_MCSPI_WAKEUPENABLE_WKEN;
991 mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE, tmp);
992 omap2_mcspi_ctx[master->bus_num - 1].wakeupenable = tmp;
994 omap2_mcspi_set_master_mode(master);
995 omap2_mcspi_disable_clocks(mcspi);
999 static u8 __initdata spi1_rxdma_id [] = {
1000 OMAP24XX_DMA_SPI1_RX0,
1001 OMAP24XX_DMA_SPI1_RX1,
1002 OMAP24XX_DMA_SPI1_RX2,
1003 OMAP24XX_DMA_SPI1_RX3,
1006 static u8 __initdata spi1_txdma_id [] = {
1007 OMAP24XX_DMA_SPI1_TX0,
1008 OMAP24XX_DMA_SPI1_TX1,
1009 OMAP24XX_DMA_SPI1_TX2,
1010 OMAP24XX_DMA_SPI1_TX3,
1013 static u8 __initdata spi2_rxdma_id[] = {
1014 OMAP24XX_DMA_SPI2_RX0,
1015 OMAP24XX_DMA_SPI2_RX1,
1018 static u8 __initdata spi2_txdma_id[] = {
1019 OMAP24XX_DMA_SPI2_TX0,
1020 OMAP24XX_DMA_SPI2_TX1,
1023 #if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP3) \
1024 || defined(CONFIG_ARCH_OMAP4)
1025 static u8 __initdata spi3_rxdma_id[] = {
1026 OMAP24XX_DMA_SPI3_RX0,
1027 OMAP24XX_DMA_SPI3_RX1,
1030 static u8 __initdata spi3_txdma_id[] = {
1031 OMAP24XX_DMA_SPI3_TX0,
1032 OMAP24XX_DMA_SPI3_TX1,
1036 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
1037 static u8 __initdata spi4_rxdma_id[] = {
1038 OMAP34XX_DMA_SPI4_RX0,
1041 static u8 __initdata spi4_txdma_id[] = {
1042 OMAP34XX_DMA_SPI4_TX0,
1046 static int __init omap2_mcspi_probe(struct platform_device *pdev)
1048 struct spi_master *master;
1049 struct omap2_mcspi *mcspi;
1052 const u8 *rxdma_id, *txdma_id;
1053 unsigned num_chipselect;
1057 rxdma_id = spi1_rxdma_id;
1058 txdma_id = spi1_txdma_id;
1062 rxdma_id = spi2_rxdma_id;
1063 txdma_id = spi2_txdma_id;
1066 #if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP3) \
1067 || defined(CONFIG_ARCH_OMAP4)
1069 rxdma_id = spi3_rxdma_id;
1070 txdma_id = spi3_txdma_id;
1074 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
1076 rxdma_id = spi4_rxdma_id;
1077 txdma_id = spi4_txdma_id;
1085 master = spi_alloc_master(&pdev->dev, sizeof *mcspi);
1086 if (master == NULL) {
1087 dev_dbg(&pdev->dev, "master allocation failed\n");
1091 /* the spi->mode bits understood by this driver: */
1092 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1095 master->bus_num = pdev->id;
1097 master->setup = omap2_mcspi_setup;
1098 master->transfer = omap2_mcspi_transfer;
1099 master->cleanup = omap2_mcspi_cleanup;
1100 master->num_chipselect = num_chipselect;
1102 dev_set_drvdata(&pdev->dev, master);
1104 mcspi = spi_master_get_devdata(master);
1105 mcspi->master = master;
1107 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1112 if (!request_mem_region(r->start, (r->end - r->start) + 1,
1113 dev_name(&pdev->dev))) {
1118 mcspi->phys = r->start;
1119 mcspi->base = ioremap(r->start, r->end - r->start + 1);
1121 dev_dbg(&pdev->dev, "can't ioremap MCSPI\n");
1126 INIT_WORK(&mcspi->work, omap2_mcspi_work);
1128 spin_lock_init(&mcspi->lock);
1129 INIT_LIST_HEAD(&mcspi->msg_queue);
1130 INIT_LIST_HEAD(&omap2_mcspi_ctx[master->bus_num - 1].cs);
1132 mcspi->ick = clk_get(&pdev->dev, "ick");
1133 if (IS_ERR(mcspi->ick)) {
1134 dev_dbg(&pdev->dev, "can't get mcspi_ick\n");
1135 status = PTR_ERR(mcspi->ick);
1138 mcspi->fck = clk_get(&pdev->dev, "fck");
1139 if (IS_ERR(mcspi->fck)) {
1140 dev_dbg(&pdev->dev, "can't get mcspi_fck\n");
1141 status = PTR_ERR(mcspi->fck);
1145 mcspi->dma_channels = kcalloc(master->num_chipselect,
1146 sizeof(struct omap2_mcspi_dma),
1149 if (mcspi->dma_channels == NULL)
1152 for (i = 0; i < num_chipselect; i++) {
1153 mcspi->dma_channels[i].dma_rx_channel = -1;
1154 mcspi->dma_channels[i].dma_rx_sync_dev = rxdma_id[i];
1155 mcspi->dma_channels[i].dma_tx_channel = -1;
1156 mcspi->dma_channels[i].dma_tx_sync_dev = txdma_id[i];
1159 if (omap2_mcspi_reset(mcspi) < 0)
1162 status = spi_register_master(master);
1169 kfree(mcspi->dma_channels);
1171 clk_put(mcspi->fck);
1173 clk_put(mcspi->ick);
1175 iounmap(mcspi->base);
1177 release_mem_region(r->start, (r->end - r->start) + 1);
1179 spi_master_put(master);
1183 static int __exit omap2_mcspi_remove(struct platform_device *pdev)
1185 struct spi_master *master;
1186 struct omap2_mcspi *mcspi;
1187 struct omap2_mcspi_dma *dma_channels;
1191 master = dev_get_drvdata(&pdev->dev);
1192 mcspi = spi_master_get_devdata(master);
1193 dma_channels = mcspi->dma_channels;
1195 clk_put(mcspi->fck);
1196 clk_put(mcspi->ick);
1198 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1199 release_mem_region(r->start, (r->end - r->start) + 1);
1202 spi_unregister_master(master);
1204 kfree(dma_channels);
1209 /* work with hotplug and coldplug */
1210 MODULE_ALIAS("platform:omap2_mcspi");
1212 static struct platform_driver omap2_mcspi_driver = {
1214 .name = "omap2_mcspi",
1215 .owner = THIS_MODULE,
1217 .remove = __exit_p(omap2_mcspi_remove),
1221 static int __init omap2_mcspi_init(void)
1223 omap2_mcspi_wq = create_singlethread_workqueue(
1224 omap2_mcspi_driver.driver.name);
1225 if (omap2_mcspi_wq == NULL)
1227 return platform_driver_probe(&omap2_mcspi_driver, omap2_mcspi_probe);
1229 subsys_initcall(omap2_mcspi_init);
1231 static void __exit omap2_mcspi_exit(void)
1233 platform_driver_unregister(&omap2_mcspi_driver);
1235 destroy_workqueue(omap2_mcspi_wq);
1237 module_exit(omap2_mcspi_exit);
1239 MODULE_LICENSE("GPL");