2 * SPI bus driver for CSR SiRFprimaII
4 * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
6 * Licensed under GPLv2 or later.
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/slab.h>
12 #include <linux/clk.h>
13 #include <linux/interrupt.h>
16 #include <linux/bitops.h>
17 #include <linux/err.h>
18 #include <linux/platform_device.h>
19 #include <linux/of_gpio.h>
20 #include <linux/spi/spi.h>
21 #include <linux/spi/spi_bitbang.h>
22 #include <linux/dmaengine.h>
23 #include <linux/dma-direction.h>
24 #include <linux/dma-mapping.h>
26 #define DRIVER_NAME "sirfsoc_spi"
28 #define SIRFSOC_SPI_CTRL 0x0000
29 #define SIRFSOC_SPI_CMD 0x0004
30 #define SIRFSOC_SPI_TX_RX_EN 0x0008
31 #define SIRFSOC_SPI_INT_EN 0x000C
32 #define SIRFSOC_SPI_INT_STATUS 0x0010
33 #define SIRFSOC_SPI_TX_DMA_IO_CTRL 0x0100
34 #define SIRFSOC_SPI_TX_DMA_IO_LEN 0x0104
35 #define SIRFSOC_SPI_TXFIFO_CTRL 0x0108
36 #define SIRFSOC_SPI_TXFIFO_LEVEL_CHK 0x010C
37 #define SIRFSOC_SPI_TXFIFO_OP 0x0110
38 #define SIRFSOC_SPI_TXFIFO_STATUS 0x0114
39 #define SIRFSOC_SPI_TXFIFO_DATA 0x0118
40 #define SIRFSOC_SPI_RX_DMA_IO_CTRL 0x0120
41 #define SIRFSOC_SPI_RX_DMA_IO_LEN 0x0124
42 #define SIRFSOC_SPI_RXFIFO_CTRL 0x0128
43 #define SIRFSOC_SPI_RXFIFO_LEVEL_CHK 0x012C
44 #define SIRFSOC_SPI_RXFIFO_OP 0x0130
45 #define SIRFSOC_SPI_RXFIFO_STATUS 0x0134
46 #define SIRFSOC_SPI_RXFIFO_DATA 0x0138
47 #define SIRFSOC_SPI_DUMMY_DELAY_CTL 0x0144
49 /* SPI CTRL register defines */
50 #define SIRFSOC_SPI_SLV_MODE BIT(16)
51 #define SIRFSOC_SPI_CMD_MODE BIT(17)
52 #define SIRFSOC_SPI_CS_IO_OUT BIT(18)
53 #define SIRFSOC_SPI_CS_IO_MODE BIT(19)
54 #define SIRFSOC_SPI_CLK_IDLE_STAT BIT(20)
55 #define SIRFSOC_SPI_CS_IDLE_STAT BIT(21)
56 #define SIRFSOC_SPI_TRAN_MSB BIT(22)
57 #define SIRFSOC_SPI_DRV_POS_EDGE BIT(23)
58 #define SIRFSOC_SPI_CS_HOLD_TIME BIT(24)
59 #define SIRFSOC_SPI_CLK_SAMPLE_MODE BIT(25)
60 #define SIRFSOC_SPI_TRAN_DAT_FORMAT_8 (0 << 26)
61 #define SIRFSOC_SPI_TRAN_DAT_FORMAT_12 (1 << 26)
62 #define SIRFSOC_SPI_TRAN_DAT_FORMAT_16 (2 << 26)
63 #define SIRFSOC_SPI_TRAN_DAT_FORMAT_32 (3 << 26)
64 #define SIRFSOC_SPI_CMD_BYTE_NUM(x) ((x & 3) << 28)
65 #define SIRFSOC_SPI_ENA_AUTO_CLR BIT(30)
66 #define SIRFSOC_SPI_MUL_DAT_MODE BIT(31)
68 /* Interrupt Enable */
69 #define SIRFSOC_SPI_RX_DONE_INT_EN BIT(0)
70 #define SIRFSOC_SPI_TX_DONE_INT_EN BIT(1)
71 #define SIRFSOC_SPI_RX_OFLOW_INT_EN BIT(2)
72 #define SIRFSOC_SPI_TX_UFLOW_INT_EN BIT(3)
73 #define SIRFSOC_SPI_RX_IO_DMA_INT_EN BIT(4)
74 #define SIRFSOC_SPI_TX_IO_DMA_INT_EN BIT(5)
75 #define SIRFSOC_SPI_RXFIFO_FULL_INT_EN BIT(6)
76 #define SIRFSOC_SPI_TXFIFO_EMPTY_INT_EN BIT(7)
77 #define SIRFSOC_SPI_RXFIFO_THD_INT_EN BIT(8)
78 #define SIRFSOC_SPI_TXFIFO_THD_INT_EN BIT(9)
79 #define SIRFSOC_SPI_FRM_END_INT_EN BIT(10)
81 #define SIRFSOC_SPI_INT_MASK_ALL 0x1FFF
83 /* Interrupt status */
84 #define SIRFSOC_SPI_RX_DONE BIT(0)
85 #define SIRFSOC_SPI_TX_DONE BIT(1)
86 #define SIRFSOC_SPI_RX_OFLOW BIT(2)
87 #define SIRFSOC_SPI_TX_UFLOW BIT(3)
88 #define SIRFSOC_SPI_RX_FIFO_FULL BIT(6)
89 #define SIRFSOC_SPI_TXFIFO_EMPTY BIT(7)
90 #define SIRFSOC_SPI_RXFIFO_THD_REACH BIT(8)
91 #define SIRFSOC_SPI_TXFIFO_THD_REACH BIT(9)
92 #define SIRFSOC_SPI_FRM_END BIT(10)
95 #define SIRFSOC_SPI_RX_EN BIT(0)
96 #define SIRFSOC_SPI_TX_EN BIT(1)
97 #define SIRFSOC_SPI_CMD_TX_EN BIT(2)
99 #define SIRFSOC_SPI_IO_MODE_SEL BIT(0)
100 #define SIRFSOC_SPI_RX_DMA_FLUSH BIT(2)
103 #define SIRFSOC_SPI_FIFO_RESET BIT(0)
104 #define SIRFSOC_SPI_FIFO_START BIT(1)
107 #define SIRFSOC_SPI_FIFO_WIDTH_BYTE (0 << 0)
108 #define SIRFSOC_SPI_FIFO_WIDTH_WORD (1 << 0)
109 #define SIRFSOC_SPI_FIFO_WIDTH_DWORD (2 << 0)
112 #define SIRFSOC_SPI_FIFO_LEVEL_MASK 0xFF
113 #define SIRFSOC_SPI_FIFO_FULL BIT(8)
114 #define SIRFSOC_SPI_FIFO_EMPTY BIT(9)
116 /* 256 bytes rx/tx FIFO */
117 #define SIRFSOC_SPI_FIFO_SIZE 256
118 #define SIRFSOC_SPI_DAT_FRM_LEN_MAX (64 * 1024)
120 #define SIRFSOC_SPI_FIFO_SC(x) ((x) & 0x3F)
121 #define SIRFSOC_SPI_FIFO_LC(x) (((x) & 0x3F) << 10)
122 #define SIRFSOC_SPI_FIFO_HC(x) (((x) & 0x3F) << 20)
123 #define SIRFSOC_SPI_FIFO_THD(x) (((x) & 0xFF) << 2)
126 * only if the rx/tx buffer and transfer size are 4-bytes aligned, we use dma
127 * due to the limitation of dma controller
130 #define ALIGNED(x) (!((u32)x & 0x3))
131 #define IS_DMA_VALID(x) (x && ALIGNED(x->tx_buf) && ALIGNED(x->rx_buf) && \
132 ALIGNED(x->len) && (x->len < 2 * PAGE_SIZE))
135 struct spi_bitbang bitbang;
136 struct completion rx_done;
137 struct completion tx_done;
140 u32 ctrl_freq; /* SPI controller clock speed */
143 /* rx & tx bufs from the spi_transfer */
147 /* place received word into rx buffer */
148 void (*rx_word) (struct sirfsoc_spi *);
149 /* get word from tx buffer for sending */
150 void (*tx_word) (struct sirfsoc_spi *);
152 /* number of words left to be tranmitted/received */
153 unsigned int left_tx_word;
154 unsigned int left_rx_word;
156 /* rx & tx DMA channels */
157 struct dma_chan *rx_chan;
158 struct dma_chan *tx_chan;
159 dma_addr_t src_start;
160 dma_addr_t dst_start;
162 int word_width; /* in bytes */
167 static void spi_sirfsoc_rx_word_u8(struct sirfsoc_spi *sspi)
172 data = readl(sspi->base + SIRFSOC_SPI_RXFIFO_DATA);
179 sspi->left_rx_word--;
182 static void spi_sirfsoc_tx_word_u8(struct sirfsoc_spi *sspi)
185 const u8 *tx = sspi->tx;
192 writel(data, sspi->base + SIRFSOC_SPI_TXFIFO_DATA);
193 sspi->left_tx_word--;
196 static void spi_sirfsoc_rx_word_u16(struct sirfsoc_spi *sspi)
201 data = readl(sspi->base + SIRFSOC_SPI_RXFIFO_DATA);
208 sspi->left_rx_word--;
211 static void spi_sirfsoc_tx_word_u16(struct sirfsoc_spi *sspi)
214 const u16 *tx = sspi->tx;
221 writel(data, sspi->base + SIRFSOC_SPI_TXFIFO_DATA);
222 sspi->left_tx_word--;
225 static void spi_sirfsoc_rx_word_u32(struct sirfsoc_spi *sspi)
230 data = readl(sspi->base + SIRFSOC_SPI_RXFIFO_DATA);
237 sspi->left_rx_word--;
241 static void spi_sirfsoc_tx_word_u32(struct sirfsoc_spi *sspi)
244 const u32 *tx = sspi->tx;
251 writel(data, sspi->base + SIRFSOC_SPI_TXFIFO_DATA);
252 sspi->left_tx_word--;
255 static irqreturn_t spi_sirfsoc_irq(int irq, void *dev_id)
257 struct sirfsoc_spi *sspi = dev_id;
258 u32 spi_stat = readl(sspi->base + SIRFSOC_SPI_INT_STATUS);
260 writel(spi_stat, sspi->base + SIRFSOC_SPI_INT_STATUS);
262 /* Error Conditions */
263 if (spi_stat & SIRFSOC_SPI_RX_OFLOW ||
264 spi_stat & SIRFSOC_SPI_TX_UFLOW) {
265 complete(&sspi->rx_done);
266 writel(0x0, sspi->base + SIRFSOC_SPI_INT_EN);
269 if (spi_stat & (SIRFSOC_SPI_FRM_END
270 | SIRFSOC_SPI_RXFIFO_THD_REACH))
271 while (!((readl(sspi->base + SIRFSOC_SPI_RXFIFO_STATUS)
272 & SIRFSOC_SPI_FIFO_EMPTY)) &&
276 if (spi_stat & (SIRFSOC_SPI_FIFO_EMPTY
277 | SIRFSOC_SPI_TXFIFO_THD_REACH))
278 while (!((readl(sspi->base + SIRFSOC_SPI_TXFIFO_STATUS)
279 & SIRFSOC_SPI_FIFO_FULL)) &&
283 /* Received all words */
284 if ((sspi->left_rx_word == 0) && (sspi->left_tx_word == 0)) {
285 complete(&sspi->rx_done);
286 writel(0x0, sspi->base + SIRFSOC_SPI_INT_EN);
291 static void spi_sirfsoc_dma_fini_callback(void *data)
293 struct completion *dma_complete = data;
295 complete(dma_complete);
298 static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t)
300 struct sirfsoc_spi *sspi;
301 int timeout = t->len * 10;
302 sspi = spi_master_get_devdata(spi->master);
304 sspi->tx = t->tx_buf ? t->tx_buf : sspi->dummypage;
305 sspi->rx = t->rx_buf ? t->rx_buf : sspi->dummypage;
306 sspi->left_tx_word = sspi->left_rx_word = t->len / sspi->word_width;
307 reinit_completion(&sspi->rx_done);
308 reinit_completion(&sspi->tx_done);
310 writel(SIRFSOC_SPI_INT_MASK_ALL, sspi->base + SIRFSOC_SPI_INT_STATUS);
312 if (sspi->left_tx_word == 1) {
313 writel(readl(sspi->base + SIRFSOC_SPI_CTRL) |
314 SIRFSOC_SPI_ENA_AUTO_CLR,
315 sspi->base + SIRFSOC_SPI_CTRL);
316 writel(0, sspi->base + SIRFSOC_SPI_TX_DMA_IO_LEN);
317 writel(0, sspi->base + SIRFSOC_SPI_RX_DMA_IO_LEN);
318 } else if ((sspi->left_tx_word > 1) && (sspi->left_tx_word <
319 SIRFSOC_SPI_DAT_FRM_LEN_MAX)) {
320 writel(readl(sspi->base + SIRFSOC_SPI_CTRL) |
321 SIRFSOC_SPI_MUL_DAT_MODE |
322 SIRFSOC_SPI_ENA_AUTO_CLR,
323 sspi->base + SIRFSOC_SPI_CTRL);
324 writel(sspi->left_tx_word - 1,
325 sspi->base + SIRFSOC_SPI_TX_DMA_IO_LEN);
326 writel(sspi->left_tx_word - 1,
327 sspi->base + SIRFSOC_SPI_RX_DMA_IO_LEN);
329 writel(readl(sspi->base + SIRFSOC_SPI_CTRL),
330 sspi->base + SIRFSOC_SPI_CTRL);
331 writel(0, sspi->base + SIRFSOC_SPI_TX_DMA_IO_LEN);
332 writel(0, sspi->base + SIRFSOC_SPI_RX_DMA_IO_LEN);
335 writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_RXFIFO_OP);
336 writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
337 writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_RXFIFO_OP);
338 writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
340 if (IS_DMA_VALID(t)) {
341 struct dma_async_tx_descriptor *rx_desc, *tx_desc;
343 sspi->dst_start = dma_map_single(&spi->dev, sspi->rx, t->len, DMA_FROM_DEVICE);
344 rx_desc = dmaengine_prep_slave_single(sspi->rx_chan,
345 sspi->dst_start, t->len, DMA_DEV_TO_MEM,
346 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
347 rx_desc->callback = spi_sirfsoc_dma_fini_callback;
348 rx_desc->callback_param = &sspi->rx_done;
350 sspi->src_start = dma_map_single(&spi->dev, (void *)sspi->tx, t->len, DMA_TO_DEVICE);
351 tx_desc = dmaengine_prep_slave_single(sspi->tx_chan,
352 sspi->src_start, t->len, DMA_MEM_TO_DEV,
353 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
354 tx_desc->callback = spi_sirfsoc_dma_fini_callback;
355 tx_desc->callback_param = &sspi->tx_done;
357 dmaengine_submit(tx_desc);
358 dmaengine_submit(rx_desc);
359 dma_async_issue_pending(sspi->tx_chan);
360 dma_async_issue_pending(sspi->rx_chan);
362 /* Send the first word to trigger the whole tx/rx process */
365 writel(SIRFSOC_SPI_RX_OFLOW_INT_EN | SIRFSOC_SPI_TX_UFLOW_INT_EN |
366 SIRFSOC_SPI_RXFIFO_THD_INT_EN | SIRFSOC_SPI_TXFIFO_THD_INT_EN |
367 SIRFSOC_SPI_FRM_END_INT_EN | SIRFSOC_SPI_RXFIFO_FULL_INT_EN |
368 SIRFSOC_SPI_TXFIFO_EMPTY_INT_EN, sspi->base + SIRFSOC_SPI_INT_EN);
371 writel(SIRFSOC_SPI_RX_EN | SIRFSOC_SPI_TX_EN, sspi->base + SIRFSOC_SPI_TX_RX_EN);
373 if (!IS_DMA_VALID(t)) { /* for PIO */
374 if (wait_for_completion_timeout(&sspi->rx_done, timeout) == 0)
375 dev_err(&spi->dev, "transfer timeout\n");
376 } else if (wait_for_completion_timeout(&sspi->rx_done, timeout) == 0) {
377 dev_err(&spi->dev, "transfer timeout\n");
378 dmaengine_terminate_all(sspi->rx_chan);
380 sspi->left_rx_word = 0;
383 * we only wait tx-done event if transferring by DMA. for PIO,
384 * we get rx data by writing tx data, so if rx is done, tx has
387 if (IS_DMA_VALID(t)) {
388 if (wait_for_completion_timeout(&sspi->tx_done, timeout) == 0) {
389 dev_err(&spi->dev, "transfer timeout\n");
390 dmaengine_terminate_all(sspi->tx_chan);
394 if (IS_DMA_VALID(t)) {
395 dma_unmap_single(&spi->dev, sspi->src_start, t->len, DMA_TO_DEVICE);
396 dma_unmap_single(&spi->dev, sspi->dst_start, t->len, DMA_FROM_DEVICE);
399 /* TX, RX FIFO stop */
400 writel(0, sspi->base + SIRFSOC_SPI_RXFIFO_OP);
401 writel(0, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
402 writel(0, sspi->base + SIRFSOC_SPI_TX_RX_EN);
403 writel(0, sspi->base + SIRFSOC_SPI_INT_EN);
405 return t->len - sspi->left_rx_word * sspi->word_width;
408 static void spi_sirfsoc_chipselect(struct spi_device *spi, int value)
410 struct sirfsoc_spi *sspi = spi_master_get_devdata(spi->master);
412 if (sspi->chipselect[spi->chip_select] == 0) {
413 u32 regval = readl(sspi->base + SIRFSOC_SPI_CTRL);
415 case BITBANG_CS_ACTIVE:
416 if (spi->mode & SPI_CS_HIGH)
417 regval |= SIRFSOC_SPI_CS_IO_OUT;
419 regval &= ~SIRFSOC_SPI_CS_IO_OUT;
421 case BITBANG_CS_INACTIVE:
422 if (spi->mode & SPI_CS_HIGH)
423 regval &= ~SIRFSOC_SPI_CS_IO_OUT;
425 regval |= SIRFSOC_SPI_CS_IO_OUT;
428 writel(regval, sspi->base + SIRFSOC_SPI_CTRL);
430 int gpio = sspi->chipselect[spi->chip_select];
431 gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH ? 0 : 1);
436 spi_sirfsoc_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
438 struct sirfsoc_spi *sspi;
439 u8 bits_per_word = 0;
442 u32 txfifo_ctrl, rxfifo_ctrl;
443 u32 fifo_size = SIRFSOC_SPI_FIFO_SIZE / 4;
445 sspi = spi_master_get_devdata(spi->master);
447 bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word;
448 hz = t && t->speed_hz ? t->speed_hz : spi->max_speed_hz;
450 regval = (sspi->ctrl_freq / (2 * hz)) - 1;
451 if (regval > 0xFFFF || regval < 0) {
452 dev_err(&spi->dev, "Speed %d not supported\n", hz);
456 switch (bits_per_word) {
458 regval |= SIRFSOC_SPI_TRAN_DAT_FORMAT_8;
459 sspi->rx_word = spi_sirfsoc_rx_word_u8;
460 sspi->tx_word = spi_sirfsoc_tx_word_u8;
464 regval |= (bits_per_word == 12) ? SIRFSOC_SPI_TRAN_DAT_FORMAT_12 :
465 SIRFSOC_SPI_TRAN_DAT_FORMAT_16;
466 sspi->rx_word = spi_sirfsoc_rx_word_u16;
467 sspi->tx_word = spi_sirfsoc_tx_word_u16;
470 regval |= SIRFSOC_SPI_TRAN_DAT_FORMAT_32;
471 sspi->rx_word = spi_sirfsoc_rx_word_u32;
472 sspi->tx_word = spi_sirfsoc_tx_word_u32;
478 sspi->word_width = DIV_ROUND_UP(bits_per_word, 8);
479 txfifo_ctrl = SIRFSOC_SPI_FIFO_THD(SIRFSOC_SPI_FIFO_SIZE / 2) |
481 rxfifo_ctrl = SIRFSOC_SPI_FIFO_THD(SIRFSOC_SPI_FIFO_SIZE / 2) |
484 if (!(spi->mode & SPI_CS_HIGH))
485 regval |= SIRFSOC_SPI_CS_IDLE_STAT;
486 if (!(spi->mode & SPI_LSB_FIRST))
487 regval |= SIRFSOC_SPI_TRAN_MSB;
488 if (spi->mode & SPI_CPOL)
489 regval |= SIRFSOC_SPI_CLK_IDLE_STAT;
492 * Data should be driven at least 1/2 cycle before the fetch edge to make
493 * sure that data gets stable at the fetch edge.
495 if (((spi->mode & SPI_CPOL) && (spi->mode & SPI_CPHA)) ||
496 (!(spi->mode & SPI_CPOL) && !(spi->mode & SPI_CPHA)))
497 regval &= ~SIRFSOC_SPI_DRV_POS_EDGE;
499 regval |= SIRFSOC_SPI_DRV_POS_EDGE;
501 writel(SIRFSOC_SPI_FIFO_SC(fifo_size - 2) |
502 SIRFSOC_SPI_FIFO_LC(fifo_size / 2) |
503 SIRFSOC_SPI_FIFO_HC(2),
504 sspi->base + SIRFSOC_SPI_TXFIFO_LEVEL_CHK);
505 writel(SIRFSOC_SPI_FIFO_SC(2) |
506 SIRFSOC_SPI_FIFO_LC(fifo_size / 2) |
507 SIRFSOC_SPI_FIFO_HC(fifo_size - 2),
508 sspi->base + SIRFSOC_SPI_RXFIFO_LEVEL_CHK);
509 writel(txfifo_ctrl, sspi->base + SIRFSOC_SPI_TXFIFO_CTRL);
510 writel(rxfifo_ctrl, sspi->base + SIRFSOC_SPI_RXFIFO_CTRL);
512 writel(regval, sspi->base + SIRFSOC_SPI_CTRL);
514 if (IS_DMA_VALID(t)) {
515 /* Enable DMA mode for RX, TX */
516 writel(0, sspi->base + SIRFSOC_SPI_TX_DMA_IO_CTRL);
517 writel(SIRFSOC_SPI_RX_DMA_FLUSH, sspi->base + SIRFSOC_SPI_RX_DMA_IO_CTRL);
519 /* Enable IO mode for RX, TX */
520 writel(SIRFSOC_SPI_IO_MODE_SEL, sspi->base + SIRFSOC_SPI_TX_DMA_IO_CTRL);
521 writel(SIRFSOC_SPI_IO_MODE_SEL, sspi->base + SIRFSOC_SPI_RX_DMA_IO_CTRL);
527 static int spi_sirfsoc_setup(struct spi_device *spi)
529 if (!spi->max_speed_hz)
532 return spi_sirfsoc_setup_transfer(spi, NULL);
535 static int spi_sirfsoc_probe(struct platform_device *pdev)
537 struct sirfsoc_spi *sspi;
538 struct spi_master *master;
539 struct resource *mem_res;
540 int num_cs, cs_gpio, irq;
544 ret = of_property_read_u32(pdev->dev.of_node,
545 "sirf,spi-num-chipselects", &num_cs);
547 dev_err(&pdev->dev, "Unable to get chip select number\n");
551 master = spi_alloc_master(&pdev->dev, sizeof(*sspi) + sizeof(int) * num_cs);
553 dev_err(&pdev->dev, "Unable to allocate SPI master\n");
556 platform_set_drvdata(pdev, master);
557 sspi = spi_master_get_devdata(master);
559 master->num_chipselect = num_cs;
561 for (i = 0; i < master->num_chipselect; i++) {
562 cs_gpio = of_get_named_gpio(pdev->dev.of_node, "cs-gpios", i);
564 dev_err(&pdev->dev, "can't get cs gpio from DT\n");
569 sspi->chipselect[i] = cs_gpio;
571 continue; /* use cs from spi controller */
573 ret = gpio_request(cs_gpio, DRIVER_NAME);
577 if (sspi->chipselect[i] > 0)
578 gpio_free(sspi->chipselect[i]);
580 dev_err(&pdev->dev, "fail to request cs gpios\n");
585 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
586 sspi->base = devm_ioremap_resource(&pdev->dev, mem_res);
587 if (IS_ERR(sspi->base)) {
588 ret = PTR_ERR(sspi->base);
592 irq = platform_get_irq(pdev, 0);
597 ret = devm_request_irq(&pdev->dev, irq, spi_sirfsoc_irq, 0,
602 sspi->bitbang.master = master;
603 sspi->bitbang.chipselect = spi_sirfsoc_chipselect;
604 sspi->bitbang.setup_transfer = spi_sirfsoc_setup_transfer;
605 sspi->bitbang.txrx_bufs = spi_sirfsoc_transfer;
606 sspi->bitbang.master->setup = spi_sirfsoc_setup;
607 master->bus_num = pdev->id;
608 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_CS_HIGH;
609 master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(12) |
610 SPI_BPW_MASK(16) | SPI_BPW_MASK(32);
611 sspi->bitbang.master->dev.of_node = pdev->dev.of_node;
613 /* request DMA channels */
614 sspi->rx_chan = dma_request_slave_channel(&pdev->dev, "rx");
615 if (!sspi->rx_chan) {
616 dev_err(&pdev->dev, "can not allocate rx dma channel\n");
620 sspi->tx_chan = dma_request_slave_channel(&pdev->dev, "tx");
621 if (!sspi->tx_chan) {
622 dev_err(&pdev->dev, "can not allocate tx dma channel\n");
627 sspi->clk = clk_get(&pdev->dev, NULL);
628 if (IS_ERR(sspi->clk)) {
629 ret = PTR_ERR(sspi->clk);
632 clk_prepare_enable(sspi->clk);
633 sspi->ctrl_freq = clk_get_rate(sspi->clk);
635 init_completion(&sspi->rx_done);
636 init_completion(&sspi->tx_done);
638 writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_RXFIFO_OP);
639 writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
640 writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_RXFIFO_OP);
641 writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
642 /* We are not using dummy delay between command and data */
643 writel(0, sspi->base + SIRFSOC_SPI_DUMMY_DELAY_CTL);
645 sspi->dummypage = kmalloc(2 * PAGE_SIZE, GFP_KERNEL);
646 if (!sspi->dummypage) {
651 ret = spi_bitbang_start(&sspi->bitbang);
655 dev_info(&pdev->dev, "registerred, bus number = %d\n", master->bus_num);
659 kfree(sspi->dummypage);
661 clk_disable_unprepare(sspi->clk);
664 dma_release_channel(sspi->tx_chan);
666 dma_release_channel(sspi->rx_chan);
668 spi_master_put(master);
673 static int spi_sirfsoc_remove(struct platform_device *pdev)
675 struct spi_master *master;
676 struct sirfsoc_spi *sspi;
679 master = platform_get_drvdata(pdev);
680 sspi = spi_master_get_devdata(master);
682 spi_bitbang_stop(&sspi->bitbang);
683 for (i = 0; i < master->num_chipselect; i++) {
684 if (sspi->chipselect[i] > 0)
685 gpio_free(sspi->chipselect[i]);
687 kfree(sspi->dummypage);
688 clk_disable_unprepare(sspi->clk);
690 dma_release_channel(sspi->rx_chan);
691 dma_release_channel(sspi->tx_chan);
692 spi_master_put(master);
696 #ifdef CONFIG_PM_SLEEP
697 static int spi_sirfsoc_suspend(struct device *dev)
699 struct spi_master *master = dev_get_drvdata(dev);
700 struct sirfsoc_spi *sspi = spi_master_get_devdata(master);
702 clk_disable(sspi->clk);
706 static int spi_sirfsoc_resume(struct device *dev)
708 struct spi_master *master = dev_get_drvdata(dev);
709 struct sirfsoc_spi *sspi = spi_master_get_devdata(master);
711 clk_enable(sspi->clk);
712 writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_RXFIFO_OP);
713 writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
714 writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_RXFIFO_OP);
715 writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
721 static SIMPLE_DEV_PM_OPS(spi_sirfsoc_pm_ops, spi_sirfsoc_suspend,
724 static const struct of_device_id spi_sirfsoc_of_match[] = {
725 { .compatible = "sirf,prima2-spi", },
726 { .compatible = "sirf,marco-spi", },
729 MODULE_DEVICE_TABLE(of, spi_sirfsoc_of_match);
731 static struct platform_driver spi_sirfsoc_driver = {
734 .owner = THIS_MODULE,
735 .pm = &spi_sirfsoc_pm_ops,
736 .of_match_table = spi_sirfsoc_of_match,
738 .probe = spi_sirfsoc_probe,
739 .remove = spi_sirfsoc_remove,
741 module_platform_driver(spi_sirfsoc_driver);
743 MODULE_DESCRIPTION("SiRF SoC SPI master driver");
744 MODULE_AUTHOR("Zhiwu Song <Zhiwu.Song@csr.com>, "
745 "Barry Song <Baohua.Song@csr.com>");
746 MODULE_LICENSE("GPL v2");