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1cc2df9d ZS |
1 | /* |
2 | * SPI bus driver for CSR SiRFprimaII | |
3 | * | |
4 | * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. | |
5 | * | |
6 | * Licensed under GPLv2 or later. | |
7 | */ | |
8 | ||
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> | |
14 | #include <linux/io.h> | |
15 | #include <linux/of.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> | |
de39f5fa BS |
22 | #include <linux/dmaengine.h> |
23 | #include <linux/dma-direction.h> | |
24 | #include <linux/dma-mapping.h> | |
25 | #include <linux/sirfsoc_dma.h> | |
1cc2df9d ZS |
26 | |
27 | #define DRIVER_NAME "sirfsoc_spi" | |
28 | ||
29 | #define SIRFSOC_SPI_CTRL 0x0000 | |
30 | #define SIRFSOC_SPI_CMD 0x0004 | |
31 | #define SIRFSOC_SPI_TX_RX_EN 0x0008 | |
32 | #define SIRFSOC_SPI_INT_EN 0x000C | |
33 | #define SIRFSOC_SPI_INT_STATUS 0x0010 | |
34 | #define SIRFSOC_SPI_TX_DMA_IO_CTRL 0x0100 | |
35 | #define SIRFSOC_SPI_TX_DMA_IO_LEN 0x0104 | |
36 | #define SIRFSOC_SPI_TXFIFO_CTRL 0x0108 | |
37 | #define SIRFSOC_SPI_TXFIFO_LEVEL_CHK 0x010C | |
38 | #define SIRFSOC_SPI_TXFIFO_OP 0x0110 | |
39 | #define SIRFSOC_SPI_TXFIFO_STATUS 0x0114 | |
40 | #define SIRFSOC_SPI_TXFIFO_DATA 0x0118 | |
41 | #define SIRFSOC_SPI_RX_DMA_IO_CTRL 0x0120 | |
42 | #define SIRFSOC_SPI_RX_DMA_IO_LEN 0x0124 | |
43 | #define SIRFSOC_SPI_RXFIFO_CTRL 0x0128 | |
44 | #define SIRFSOC_SPI_RXFIFO_LEVEL_CHK 0x012C | |
45 | #define SIRFSOC_SPI_RXFIFO_OP 0x0130 | |
46 | #define SIRFSOC_SPI_RXFIFO_STATUS 0x0134 | |
47 | #define SIRFSOC_SPI_RXFIFO_DATA 0x0138 | |
48 | #define SIRFSOC_SPI_DUMMY_DELAY_CTL 0x0144 | |
49 | ||
50 | /* SPI CTRL register defines */ | |
51 | #define SIRFSOC_SPI_SLV_MODE BIT(16) | |
52 | #define SIRFSOC_SPI_CMD_MODE BIT(17) | |
53 | #define SIRFSOC_SPI_CS_IO_OUT BIT(18) | |
54 | #define SIRFSOC_SPI_CS_IO_MODE BIT(19) | |
55 | #define SIRFSOC_SPI_CLK_IDLE_STAT BIT(20) | |
56 | #define SIRFSOC_SPI_CS_IDLE_STAT BIT(21) | |
57 | #define SIRFSOC_SPI_TRAN_MSB BIT(22) | |
58 | #define SIRFSOC_SPI_DRV_POS_EDGE BIT(23) | |
59 | #define SIRFSOC_SPI_CS_HOLD_TIME BIT(24) | |
60 | #define SIRFSOC_SPI_CLK_SAMPLE_MODE BIT(25) | |
61 | #define SIRFSOC_SPI_TRAN_DAT_FORMAT_8 (0 << 26) | |
62 | #define SIRFSOC_SPI_TRAN_DAT_FORMAT_12 (1 << 26) | |
63 | #define SIRFSOC_SPI_TRAN_DAT_FORMAT_16 (2 << 26) | |
64 | #define SIRFSOC_SPI_TRAN_DAT_FORMAT_32 (3 << 26) | |
65 | #define SIRFSOC_SPI_CMD_BYTE_NUM(x) ((x & 3) << 28) | |
66 | #define SIRFSOC_SPI_ENA_AUTO_CLR BIT(30) | |
67 | #define SIRFSOC_SPI_MUL_DAT_MODE BIT(31) | |
68 | ||
69 | /* Interrupt Enable */ | |
70 | #define SIRFSOC_SPI_RX_DONE_INT_EN BIT(0) | |
71 | #define SIRFSOC_SPI_TX_DONE_INT_EN BIT(1) | |
72 | #define SIRFSOC_SPI_RX_OFLOW_INT_EN BIT(2) | |
73 | #define SIRFSOC_SPI_TX_UFLOW_INT_EN BIT(3) | |
74 | #define SIRFSOC_SPI_RX_IO_DMA_INT_EN BIT(4) | |
75 | #define SIRFSOC_SPI_TX_IO_DMA_INT_EN BIT(5) | |
76 | #define SIRFSOC_SPI_RXFIFO_FULL_INT_EN BIT(6) | |
77 | #define SIRFSOC_SPI_TXFIFO_EMPTY_INT_EN BIT(7) | |
78 | #define SIRFSOC_SPI_RXFIFO_THD_INT_EN BIT(8) | |
79 | #define SIRFSOC_SPI_TXFIFO_THD_INT_EN BIT(9) | |
80 | #define SIRFSOC_SPI_FRM_END_INT_EN BIT(10) | |
81 | ||
82 | #define SIRFSOC_SPI_INT_MASK_ALL 0x1FFF | |
83 | ||
84 | /* Interrupt status */ | |
85 | #define SIRFSOC_SPI_RX_DONE BIT(0) | |
86 | #define SIRFSOC_SPI_TX_DONE BIT(1) | |
87 | #define SIRFSOC_SPI_RX_OFLOW BIT(2) | |
88 | #define SIRFSOC_SPI_TX_UFLOW BIT(3) | |
89 | #define SIRFSOC_SPI_RX_FIFO_FULL BIT(6) | |
90 | #define SIRFSOC_SPI_TXFIFO_EMPTY BIT(7) | |
91 | #define SIRFSOC_SPI_RXFIFO_THD_REACH BIT(8) | |
92 | #define SIRFSOC_SPI_TXFIFO_THD_REACH BIT(9) | |
93 | #define SIRFSOC_SPI_FRM_END BIT(10) | |
94 | ||
95 | /* TX RX enable */ | |
96 | #define SIRFSOC_SPI_RX_EN BIT(0) | |
97 | #define SIRFSOC_SPI_TX_EN BIT(1) | |
98 | #define SIRFSOC_SPI_CMD_TX_EN BIT(2) | |
99 | ||
100 | #define SIRFSOC_SPI_IO_MODE_SEL BIT(0) | |
101 | #define SIRFSOC_SPI_RX_DMA_FLUSH BIT(2) | |
102 | ||
103 | /* FIFO OPs */ | |
104 | #define SIRFSOC_SPI_FIFO_RESET BIT(0) | |
105 | #define SIRFSOC_SPI_FIFO_START BIT(1) | |
106 | ||
107 | /* FIFO CTRL */ | |
108 | #define SIRFSOC_SPI_FIFO_WIDTH_BYTE (0 << 0) | |
109 | #define SIRFSOC_SPI_FIFO_WIDTH_WORD (1 << 0) | |
110 | #define SIRFSOC_SPI_FIFO_WIDTH_DWORD (2 << 0) | |
111 | ||
112 | /* FIFO Status */ | |
113 | #define SIRFSOC_SPI_FIFO_LEVEL_MASK 0xFF | |
114 | #define SIRFSOC_SPI_FIFO_FULL BIT(8) | |
115 | #define SIRFSOC_SPI_FIFO_EMPTY BIT(9) | |
116 | ||
117 | /* 256 bytes rx/tx FIFO */ | |
118 | #define SIRFSOC_SPI_FIFO_SIZE 256 | |
119 | #define SIRFSOC_SPI_DAT_FRM_LEN_MAX (64 * 1024) | |
120 | ||
121 | #define SIRFSOC_SPI_FIFO_SC(x) ((x) & 0x3F) | |
122 | #define SIRFSOC_SPI_FIFO_LC(x) (((x) & 0x3F) << 10) | |
123 | #define SIRFSOC_SPI_FIFO_HC(x) (((x) & 0x3F) << 20) | |
124 | #define SIRFSOC_SPI_FIFO_THD(x) (((x) & 0xFF) << 2) | |
125 | ||
de39f5fa BS |
126 | /* |
127 | * only if the rx/tx buffer and transfer size are 4-bytes aligned, we use dma | |
128 | * due to the limitation of dma controller | |
129 | */ | |
130 | ||
131 | #define ALIGNED(x) (!((u32)x & 0x3)) | |
132 | #define IS_DMA_VALID(x) (x && ALIGNED(x->tx_buf) && ALIGNED(x->rx_buf) && \ | |
692fb0fe | 133 | ALIGNED(x->len) && (x->len < 2 * PAGE_SIZE)) |
de39f5fa | 134 | |
1cc2df9d ZS |
135 | struct sirfsoc_spi { |
136 | struct spi_bitbang bitbang; | |
de39f5fa BS |
137 | struct completion rx_done; |
138 | struct completion tx_done; | |
1cc2df9d ZS |
139 | |
140 | void __iomem *base; | |
141 | u32 ctrl_freq; /* SPI controller clock speed */ | |
142 | struct clk *clk; | |
1cc2df9d ZS |
143 | |
144 | /* rx & tx bufs from the spi_transfer */ | |
145 | const void *tx; | |
146 | void *rx; | |
147 | ||
148 | /* place received word into rx buffer */ | |
149 | void (*rx_word) (struct sirfsoc_spi *); | |
150 | /* get word from tx buffer for sending */ | |
151 | void (*tx_word) (struct sirfsoc_spi *); | |
152 | ||
153 | /* number of words left to be tranmitted/received */ | |
692fb0fe QL |
154 | unsigned int left_tx_word; |
155 | unsigned int left_rx_word; | |
1cc2df9d | 156 | |
de39f5fa BS |
157 | /* rx & tx DMA channels */ |
158 | struct dma_chan *rx_chan; | |
159 | struct dma_chan *tx_chan; | |
160 | dma_addr_t src_start; | |
161 | dma_addr_t dst_start; | |
162 | void *dummypage; | |
163 | int word_width; /* in bytes */ | |
1cc2df9d | 164 | |
1cc2df9d ZS |
165 | int chipselect[0]; |
166 | }; | |
167 | ||
168 | static void spi_sirfsoc_rx_word_u8(struct sirfsoc_spi *sspi) | |
169 | { | |
170 | u32 data; | |
171 | u8 *rx = sspi->rx; | |
172 | ||
173 | data = readl(sspi->base + SIRFSOC_SPI_RXFIFO_DATA); | |
174 | ||
175 | if (rx) { | |
176 | *rx++ = (u8) data; | |
177 | sspi->rx = rx; | |
178 | } | |
179 | ||
692fb0fe | 180 | sspi->left_rx_word--; |
1cc2df9d ZS |
181 | } |
182 | ||
183 | static void spi_sirfsoc_tx_word_u8(struct sirfsoc_spi *sspi) | |
184 | { | |
185 | u32 data = 0; | |
186 | const u8 *tx = sspi->tx; | |
187 | ||
188 | if (tx) { | |
189 | data = *tx++; | |
190 | sspi->tx = tx; | |
191 | } | |
192 | ||
193 | writel(data, sspi->base + SIRFSOC_SPI_TXFIFO_DATA); | |
692fb0fe | 194 | sspi->left_tx_word--; |
1cc2df9d ZS |
195 | } |
196 | ||
197 | static void spi_sirfsoc_rx_word_u16(struct sirfsoc_spi *sspi) | |
198 | { | |
199 | u32 data; | |
200 | u16 *rx = sspi->rx; | |
201 | ||
202 | data = readl(sspi->base + SIRFSOC_SPI_RXFIFO_DATA); | |
203 | ||
204 | if (rx) { | |
205 | *rx++ = (u16) data; | |
206 | sspi->rx = rx; | |
207 | } | |
208 | ||
692fb0fe | 209 | sspi->left_rx_word--; |
1cc2df9d ZS |
210 | } |
211 | ||
212 | static void spi_sirfsoc_tx_word_u16(struct sirfsoc_spi *sspi) | |
213 | { | |
214 | u32 data = 0; | |
215 | const u16 *tx = sspi->tx; | |
216 | ||
217 | if (tx) { | |
218 | data = *tx++; | |
219 | sspi->tx = tx; | |
220 | } | |
221 | ||
222 | writel(data, sspi->base + SIRFSOC_SPI_TXFIFO_DATA); | |
692fb0fe | 223 | sspi->left_tx_word--; |
1cc2df9d ZS |
224 | } |
225 | ||
226 | static void spi_sirfsoc_rx_word_u32(struct sirfsoc_spi *sspi) | |
227 | { | |
228 | u32 data; | |
229 | u32 *rx = sspi->rx; | |
230 | ||
231 | data = readl(sspi->base + SIRFSOC_SPI_RXFIFO_DATA); | |
232 | ||
233 | if (rx) { | |
234 | *rx++ = (u32) data; | |
235 | sspi->rx = rx; | |
236 | } | |
237 | ||
692fb0fe | 238 | sspi->left_rx_word--; |
1cc2df9d ZS |
239 | |
240 | } | |
241 | ||
242 | static void spi_sirfsoc_tx_word_u32(struct sirfsoc_spi *sspi) | |
243 | { | |
244 | u32 data = 0; | |
245 | const u32 *tx = sspi->tx; | |
246 | ||
247 | if (tx) { | |
248 | data = *tx++; | |
249 | sspi->tx = tx; | |
250 | } | |
251 | ||
252 | writel(data, sspi->base + SIRFSOC_SPI_TXFIFO_DATA); | |
692fb0fe | 253 | sspi->left_tx_word--; |
1cc2df9d ZS |
254 | } |
255 | ||
1cc2df9d ZS |
256 | static irqreturn_t spi_sirfsoc_irq(int irq, void *dev_id) |
257 | { | |
258 | struct sirfsoc_spi *sspi = dev_id; | |
259 | u32 spi_stat = readl(sspi->base + SIRFSOC_SPI_INT_STATUS); | |
260 | ||
261 | writel(spi_stat, sspi->base + SIRFSOC_SPI_INT_STATUS); | |
262 | ||
263 | /* Error Conditions */ | |
264 | if (spi_stat & SIRFSOC_SPI_RX_OFLOW || | |
265 | spi_stat & SIRFSOC_SPI_TX_UFLOW) { | |
de39f5fa | 266 | complete(&sspi->rx_done); |
1cc2df9d ZS |
267 | writel(0x0, sspi->base + SIRFSOC_SPI_INT_EN); |
268 | } | |
269 | ||
237ce466 QL |
270 | if (spi_stat & (SIRFSOC_SPI_FRM_END |
271 | | SIRFSOC_SPI_RXFIFO_THD_REACH)) | |
1cc2df9d ZS |
272 | while (!((readl(sspi->base + SIRFSOC_SPI_RXFIFO_STATUS) |
273 | & SIRFSOC_SPI_FIFO_EMPTY)) && | |
692fb0fe | 274 | sspi->left_rx_word) |
1cc2df9d ZS |
275 | sspi->rx_word(sspi); |
276 | ||
237ce466 QL |
277 | if (spi_stat & (SIRFSOC_SPI_FIFO_EMPTY |
278 | | SIRFSOC_SPI_TXFIFO_THD_REACH)) | |
279 | while (!((readl(sspi->base + SIRFSOC_SPI_TXFIFO_STATUS) | |
280 | & SIRFSOC_SPI_FIFO_FULL)) && | |
692fb0fe | 281 | sspi->left_tx_word) |
237ce466 | 282 | sspi->tx_word(sspi); |
1cc2df9d | 283 | |
237ce466 | 284 | /* Received all words */ |
692fb0fe | 285 | if ((sspi->left_rx_word == 0) && (sspi->left_tx_word == 0)) { |
de39f5fa | 286 | complete(&sspi->rx_done); |
237ce466 QL |
287 | writel(0x0, sspi->base + SIRFSOC_SPI_INT_EN); |
288 | } | |
1cc2df9d ZS |
289 | return IRQ_HANDLED; |
290 | } | |
291 | ||
de39f5fa BS |
292 | static void spi_sirfsoc_dma_fini_callback(void *data) |
293 | { | |
294 | struct completion *dma_complete = data; | |
295 | ||
296 | complete(dma_complete); | |
297 | } | |
298 | ||
1cc2df9d ZS |
299 | static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t) |
300 | { | |
301 | struct sirfsoc_spi *sspi; | |
302 | int timeout = t->len * 10; | |
303 | sspi = spi_master_get_devdata(spi->master); | |
304 | ||
de39f5fa BS |
305 | sspi->tx = t->tx_buf ? t->tx_buf : sspi->dummypage; |
306 | sspi->rx = t->rx_buf ? t->rx_buf : sspi->dummypage; | |
692fb0fe | 307 | sspi->left_tx_word = sspi->left_rx_word = t->len / sspi->word_width; |
de39f5fa BS |
308 | INIT_COMPLETION(sspi->rx_done); |
309 | INIT_COMPLETION(sspi->tx_done); | |
1cc2df9d ZS |
310 | |
311 | writel(SIRFSOC_SPI_INT_MASK_ALL, sspi->base + SIRFSOC_SPI_INT_STATUS); | |
312 | ||
692fb0fe | 313 | if (sspi->left_tx_word == 1) { |
1cc2df9d ZS |
314 | writel(readl(sspi->base + SIRFSOC_SPI_CTRL) | |
315 | SIRFSOC_SPI_ENA_AUTO_CLR, | |
316 | sspi->base + SIRFSOC_SPI_CTRL); | |
317 | writel(0, sspi->base + SIRFSOC_SPI_TX_DMA_IO_LEN); | |
318 | writel(0, sspi->base + SIRFSOC_SPI_RX_DMA_IO_LEN); | |
692fb0fe QL |
319 | } else if ((sspi->left_tx_word > 1) && (sspi->left_tx_word < |
320 | SIRFSOC_SPI_DAT_FRM_LEN_MAX)) { | |
1cc2df9d ZS |
321 | writel(readl(sspi->base + SIRFSOC_SPI_CTRL) | |
322 | SIRFSOC_SPI_MUL_DAT_MODE | | |
323 | SIRFSOC_SPI_ENA_AUTO_CLR, | |
324 | sspi->base + SIRFSOC_SPI_CTRL); | |
692fb0fe QL |
325 | writel(sspi->left_tx_word - 1, |
326 | sspi->base + SIRFSOC_SPI_TX_DMA_IO_LEN); | |
327 | writel(sspi->left_tx_word - 1, | |
328 | sspi->base + SIRFSOC_SPI_RX_DMA_IO_LEN); | |
1cc2df9d ZS |
329 | } else { |
330 | writel(readl(sspi->base + SIRFSOC_SPI_CTRL), | |
331 | sspi->base + SIRFSOC_SPI_CTRL); | |
332 | writel(0, sspi->base + SIRFSOC_SPI_TX_DMA_IO_LEN); | |
333 | writel(0, sspi->base + SIRFSOC_SPI_RX_DMA_IO_LEN); | |
334 | } | |
335 | ||
336 | writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_RXFIFO_OP); | |
337 | writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_TXFIFO_OP); | |
338 | writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_RXFIFO_OP); | |
339 | writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_TXFIFO_OP); | |
340 | ||
de39f5fa BS |
341 | if (IS_DMA_VALID(t)) { |
342 | struct dma_async_tx_descriptor *rx_desc, *tx_desc; | |
de39f5fa BS |
343 | |
344 | sspi->dst_start = dma_map_single(&spi->dev, sspi->rx, t->len, DMA_FROM_DEVICE); | |
345 | rx_desc = dmaengine_prep_slave_single(sspi->rx_chan, | |
692fb0fe | 346 | sspi->dst_start, t->len, DMA_DEV_TO_MEM, |
de39f5fa BS |
347 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
348 | rx_desc->callback = spi_sirfsoc_dma_fini_callback; | |
349 | rx_desc->callback_param = &sspi->rx_done; | |
350 | ||
351 | sspi->src_start = dma_map_single(&spi->dev, (void *)sspi->tx, t->len, DMA_TO_DEVICE); | |
352 | tx_desc = dmaengine_prep_slave_single(sspi->tx_chan, | |
692fb0fe | 353 | sspi->src_start, t->len, DMA_MEM_TO_DEV, |
de39f5fa BS |
354 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
355 | tx_desc->callback = spi_sirfsoc_dma_fini_callback; | |
356 | tx_desc->callback_param = &sspi->tx_done; | |
357 | ||
358 | dmaengine_submit(tx_desc); | |
359 | dmaengine_submit(rx_desc); | |
360 | dma_async_issue_pending(sspi->tx_chan); | |
361 | dma_async_issue_pending(sspi->rx_chan); | |
362 | } else { | |
363 | /* Send the first word to trigger the whole tx/rx process */ | |
364 | sspi->tx_word(sspi); | |
365 | ||
366 | writel(SIRFSOC_SPI_RX_OFLOW_INT_EN | SIRFSOC_SPI_TX_UFLOW_INT_EN | | |
367 | SIRFSOC_SPI_RXFIFO_THD_INT_EN | SIRFSOC_SPI_TXFIFO_THD_INT_EN | | |
368 | SIRFSOC_SPI_FRM_END_INT_EN | SIRFSOC_SPI_RXFIFO_FULL_INT_EN | | |
369 | SIRFSOC_SPI_TXFIFO_EMPTY_INT_EN, sspi->base + SIRFSOC_SPI_INT_EN); | |
370 | } | |
1cc2df9d | 371 | |
1cc2df9d ZS |
372 | writel(SIRFSOC_SPI_RX_EN | SIRFSOC_SPI_TX_EN, sspi->base + SIRFSOC_SPI_TX_RX_EN); |
373 | ||
de39f5fa BS |
374 | if (!IS_DMA_VALID(t)) { /* for PIO */ |
375 | if (wait_for_completion_timeout(&sspi->rx_done, timeout) == 0) | |
376 | dev_err(&spi->dev, "transfer timeout\n"); | |
377 | } else if (wait_for_completion_timeout(&sspi->rx_done, timeout) == 0) { | |
1cc2df9d | 378 | dev_err(&spi->dev, "transfer timeout\n"); |
de39f5fa BS |
379 | dmaengine_terminate_all(sspi->rx_chan); |
380 | } else | |
692fb0fe | 381 | sspi->left_rx_word = 0; |
de39f5fa BS |
382 | |
383 | /* | |
384 | * we only wait tx-done event if transferring by DMA. for PIO, | |
385 | * we get rx data by writing tx data, so if rx is done, tx has | |
386 | * done earlier | |
387 | */ | |
388 | if (IS_DMA_VALID(t)) { | |
389 | if (wait_for_completion_timeout(&sspi->tx_done, timeout) == 0) { | |
390 | dev_err(&spi->dev, "transfer timeout\n"); | |
391 | dmaengine_terminate_all(sspi->tx_chan); | |
392 | } | |
393 | } | |
394 | ||
395 | if (IS_DMA_VALID(t)) { | |
396 | dma_unmap_single(&spi->dev, sspi->src_start, t->len, DMA_TO_DEVICE); | |
397 | dma_unmap_single(&spi->dev, sspi->dst_start, t->len, DMA_FROM_DEVICE); | |
398 | } | |
1cc2df9d ZS |
399 | |
400 | /* TX, RX FIFO stop */ | |
401 | writel(0, sspi->base + SIRFSOC_SPI_RXFIFO_OP); | |
402 | writel(0, sspi->base + SIRFSOC_SPI_TXFIFO_OP); | |
403 | writel(0, sspi->base + SIRFSOC_SPI_TX_RX_EN); | |
404 | writel(0, sspi->base + SIRFSOC_SPI_INT_EN); | |
405 | ||
692fb0fe | 406 | return t->len - sspi->left_rx_word * sspi->word_width; |
1cc2df9d ZS |
407 | } |
408 | ||
409 | static void spi_sirfsoc_chipselect(struct spi_device *spi, int value) | |
410 | { | |
411 | struct sirfsoc_spi *sspi = spi_master_get_devdata(spi->master); | |
412 | ||
413 | if (sspi->chipselect[spi->chip_select] == 0) { | |
414 | u32 regval = readl(sspi->base + SIRFSOC_SPI_CTRL); | |
1cc2df9d ZS |
415 | switch (value) { |
416 | case BITBANG_CS_ACTIVE: | |
417 | if (spi->mode & SPI_CS_HIGH) | |
418 | regval |= SIRFSOC_SPI_CS_IO_OUT; | |
419 | else | |
420 | regval &= ~SIRFSOC_SPI_CS_IO_OUT; | |
421 | break; | |
422 | case BITBANG_CS_INACTIVE: | |
423 | if (spi->mode & SPI_CS_HIGH) | |
424 | regval &= ~SIRFSOC_SPI_CS_IO_OUT; | |
425 | else | |
426 | regval |= SIRFSOC_SPI_CS_IO_OUT; | |
427 | break; | |
428 | } | |
429 | writel(regval, sspi->base + SIRFSOC_SPI_CTRL); | |
430 | } else { | |
431 | int gpio = sspi->chipselect[spi->chip_select]; | |
432 | gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH ? 0 : 1); | |
433 | } | |
434 | } | |
435 | ||
436 | static int | |
437 | spi_sirfsoc_setup_transfer(struct spi_device *spi, struct spi_transfer *t) | |
438 | { | |
439 | struct sirfsoc_spi *sspi; | |
440 | u8 bits_per_word = 0; | |
441 | int hz = 0; | |
442 | u32 regval; | |
443 | u32 txfifo_ctrl, rxfifo_ctrl; | |
444 | u32 fifo_size = SIRFSOC_SPI_FIFO_SIZE / 4; | |
445 | ||
446 | sspi = spi_master_get_devdata(spi->master); | |
447 | ||
766ed704 | 448 | bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word; |
1cc2df9d ZS |
449 | hz = t && t->speed_hz ? t->speed_hz : spi->max_speed_hz; |
450 | ||
1cc2df9d | 451 | regval = (sspi->ctrl_freq / (2 * hz)) - 1; |
1cc2df9d ZS |
452 | if (regval > 0xFFFF || regval < 0) { |
453 | dev_err(&spi->dev, "Speed %d not supported\n", hz); | |
454 | return -EINVAL; | |
455 | } | |
456 | ||
457 | switch (bits_per_word) { | |
458 | case 8: | |
459 | regval |= SIRFSOC_SPI_TRAN_DAT_FORMAT_8; | |
460 | sspi->rx_word = spi_sirfsoc_rx_word_u8; | |
461 | sspi->tx_word = spi_sirfsoc_tx_word_u8; | |
462 | txfifo_ctrl = SIRFSOC_SPI_FIFO_THD(SIRFSOC_SPI_FIFO_SIZE / 2) | | |
463 | SIRFSOC_SPI_FIFO_WIDTH_BYTE; | |
464 | rxfifo_ctrl = SIRFSOC_SPI_FIFO_THD(SIRFSOC_SPI_FIFO_SIZE / 2) | | |
465 | SIRFSOC_SPI_FIFO_WIDTH_BYTE; | |
de39f5fa | 466 | sspi->word_width = 1; |
1cc2df9d ZS |
467 | break; |
468 | case 12: | |
469 | case 16: | |
470 | regval |= (bits_per_word == 12) ? SIRFSOC_SPI_TRAN_DAT_FORMAT_12 : | |
471 | SIRFSOC_SPI_TRAN_DAT_FORMAT_16; | |
472 | sspi->rx_word = spi_sirfsoc_rx_word_u16; | |
473 | sspi->tx_word = spi_sirfsoc_tx_word_u16; | |
474 | txfifo_ctrl = SIRFSOC_SPI_FIFO_THD(SIRFSOC_SPI_FIFO_SIZE / 2) | | |
475 | SIRFSOC_SPI_FIFO_WIDTH_WORD; | |
476 | rxfifo_ctrl = SIRFSOC_SPI_FIFO_THD(SIRFSOC_SPI_FIFO_SIZE / 2) | | |
477 | SIRFSOC_SPI_FIFO_WIDTH_WORD; | |
de39f5fa | 478 | sspi->word_width = 2; |
1cc2df9d ZS |
479 | break; |
480 | case 32: | |
481 | regval |= SIRFSOC_SPI_TRAN_DAT_FORMAT_32; | |
482 | sspi->rx_word = spi_sirfsoc_rx_word_u32; | |
483 | sspi->tx_word = spi_sirfsoc_tx_word_u32; | |
484 | txfifo_ctrl = SIRFSOC_SPI_FIFO_THD(SIRFSOC_SPI_FIFO_SIZE / 2) | | |
485 | SIRFSOC_SPI_FIFO_WIDTH_DWORD; | |
486 | rxfifo_ctrl = SIRFSOC_SPI_FIFO_THD(SIRFSOC_SPI_FIFO_SIZE / 2) | | |
487 | SIRFSOC_SPI_FIFO_WIDTH_DWORD; | |
de39f5fa | 488 | sspi->word_width = 4; |
1cc2df9d | 489 | break; |
804ae438 AB |
490 | default: |
491 | BUG(); | |
1cc2df9d ZS |
492 | } |
493 | ||
494 | if (!(spi->mode & SPI_CS_HIGH)) | |
495 | regval |= SIRFSOC_SPI_CS_IDLE_STAT; | |
496 | if (!(spi->mode & SPI_LSB_FIRST)) | |
497 | regval |= SIRFSOC_SPI_TRAN_MSB; | |
498 | if (spi->mode & SPI_CPOL) | |
499 | regval |= SIRFSOC_SPI_CLK_IDLE_STAT; | |
500 | ||
501 | /* | |
502 | * Data should be driven at least 1/2 cycle before the fetch edge to make | |
503 | * sure that data gets stable at the fetch edge. | |
504 | */ | |
505 | if (((spi->mode & SPI_CPOL) && (spi->mode & SPI_CPHA)) || | |
506 | (!(spi->mode & SPI_CPOL) && !(spi->mode & SPI_CPHA))) | |
507 | regval &= ~SIRFSOC_SPI_DRV_POS_EDGE; | |
508 | else | |
509 | regval |= SIRFSOC_SPI_DRV_POS_EDGE; | |
510 | ||
511 | writel(SIRFSOC_SPI_FIFO_SC(fifo_size - 2) | | |
512 | SIRFSOC_SPI_FIFO_LC(fifo_size / 2) | | |
513 | SIRFSOC_SPI_FIFO_HC(2), | |
514 | sspi->base + SIRFSOC_SPI_TXFIFO_LEVEL_CHK); | |
515 | writel(SIRFSOC_SPI_FIFO_SC(2) | | |
516 | SIRFSOC_SPI_FIFO_LC(fifo_size / 2) | | |
517 | SIRFSOC_SPI_FIFO_HC(fifo_size - 2), | |
518 | sspi->base + SIRFSOC_SPI_RXFIFO_LEVEL_CHK); | |
519 | writel(txfifo_ctrl, sspi->base + SIRFSOC_SPI_TXFIFO_CTRL); | |
520 | writel(rxfifo_ctrl, sspi->base + SIRFSOC_SPI_RXFIFO_CTRL); | |
521 | ||
522 | writel(regval, sspi->base + SIRFSOC_SPI_CTRL); | |
de39f5fa BS |
523 | |
524 | if (IS_DMA_VALID(t)) { | |
525 | /* Enable DMA mode for RX, TX */ | |
526 | writel(0, sspi->base + SIRFSOC_SPI_TX_DMA_IO_CTRL); | |
527 | writel(SIRFSOC_SPI_RX_DMA_FLUSH, sspi->base + SIRFSOC_SPI_RX_DMA_IO_CTRL); | |
528 | } else { | |
529 | /* Enable IO mode for RX, TX */ | |
530 | writel(SIRFSOC_SPI_IO_MODE_SEL, sspi->base + SIRFSOC_SPI_TX_DMA_IO_CTRL); | |
531 | writel(SIRFSOC_SPI_IO_MODE_SEL, sspi->base + SIRFSOC_SPI_RX_DMA_IO_CTRL); | |
532 | } | |
533 | ||
1cc2df9d ZS |
534 | return 0; |
535 | } | |
536 | ||
537 | static int spi_sirfsoc_setup(struct spi_device *spi) | |
538 | { | |
539 | struct sirfsoc_spi *sspi; | |
540 | ||
541 | if (!spi->max_speed_hz) | |
542 | return -EINVAL; | |
543 | ||
544 | sspi = spi_master_get_devdata(spi->master); | |
545 | ||
546 | if (!spi->bits_per_word) | |
547 | spi->bits_per_word = 8; | |
548 | ||
549 | return spi_sirfsoc_setup_transfer(spi, NULL); | |
550 | } | |
551 | ||
fd4a319b | 552 | static int spi_sirfsoc_probe(struct platform_device *pdev) |
1cc2df9d ZS |
553 | { |
554 | struct sirfsoc_spi *sspi; | |
555 | struct spi_master *master; | |
556 | struct resource *mem_res; | |
557 | int num_cs, cs_gpio, irq; | |
de39f5fa BS |
558 | u32 rx_dma_ch, tx_dma_ch; |
559 | dma_cap_mask_t dma_cap_mask; | |
1cc2df9d ZS |
560 | int i; |
561 | int ret; | |
562 | ||
563 | ret = of_property_read_u32(pdev->dev.of_node, | |
564 | "sirf,spi-num-chipselects", &num_cs); | |
565 | if (ret < 0) { | |
566 | dev_err(&pdev->dev, "Unable to get chip select number\n"); | |
567 | goto err_cs; | |
568 | } | |
569 | ||
de39f5fa BS |
570 | ret = of_property_read_u32(pdev->dev.of_node, |
571 | "sirf,spi-dma-rx-channel", &rx_dma_ch); | |
572 | if (ret < 0) { | |
573 | dev_err(&pdev->dev, "Unable to get rx dma channel\n"); | |
574 | goto err_cs; | |
575 | } | |
576 | ||
577 | ret = of_property_read_u32(pdev->dev.of_node, | |
578 | "sirf,spi-dma-tx-channel", &tx_dma_ch); | |
579 | if (ret < 0) { | |
580 | dev_err(&pdev->dev, "Unable to get tx dma channel\n"); | |
581 | goto err_cs; | |
582 | } | |
583 | ||
1cc2df9d ZS |
584 | master = spi_alloc_master(&pdev->dev, sizeof(*sspi) + sizeof(int) * num_cs); |
585 | if (!master) { | |
586 | dev_err(&pdev->dev, "Unable to allocate SPI master\n"); | |
587 | return -ENOMEM; | |
588 | } | |
589 | platform_set_drvdata(pdev, master); | |
590 | sspi = spi_master_get_devdata(master); | |
591 | ||
1cc2df9d ZS |
592 | master->num_chipselect = num_cs; |
593 | ||
594 | for (i = 0; i < master->num_chipselect; i++) { | |
595 | cs_gpio = of_get_named_gpio(pdev->dev.of_node, "cs-gpios", i); | |
596 | if (cs_gpio < 0) { | |
597 | dev_err(&pdev->dev, "can't get cs gpio from DT\n"); | |
598 | ret = -ENODEV; | |
599 | goto free_master; | |
600 | } | |
601 | ||
602 | sspi->chipselect[i] = cs_gpio; | |
603 | if (cs_gpio == 0) | |
604 | continue; /* use cs from spi controller */ | |
605 | ||
606 | ret = gpio_request(cs_gpio, DRIVER_NAME); | |
607 | if (ret) { | |
608 | while (i > 0) { | |
609 | i--; | |
610 | if (sspi->chipselect[i] > 0) | |
611 | gpio_free(sspi->chipselect[i]); | |
612 | } | |
613 | dev_err(&pdev->dev, "fail to request cs gpios\n"); | |
614 | goto free_master; | |
615 | } | |
616 | } | |
617 | ||
2479790b | 618 | mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
b0ee5605 TR |
619 | sspi->base = devm_ioremap_resource(&pdev->dev, mem_res); |
620 | if (IS_ERR(sspi->base)) { | |
621 | ret = PTR_ERR(sspi->base); | |
1cc2df9d ZS |
622 | goto free_master; |
623 | } | |
624 | ||
625 | irq = platform_get_irq(pdev, 0); | |
626 | if (irq < 0) { | |
627 | ret = -ENXIO; | |
628 | goto free_master; | |
629 | } | |
630 | ret = devm_request_irq(&pdev->dev, irq, spi_sirfsoc_irq, 0, | |
631 | DRIVER_NAME, sspi); | |
632 | if (ret) | |
633 | goto free_master; | |
634 | ||
94c69f76 | 635 | sspi->bitbang.master = master; |
1cc2df9d ZS |
636 | sspi->bitbang.chipselect = spi_sirfsoc_chipselect; |
637 | sspi->bitbang.setup_transfer = spi_sirfsoc_setup_transfer; | |
638 | sspi->bitbang.txrx_bufs = spi_sirfsoc_transfer; | |
639 | sspi->bitbang.master->setup = spi_sirfsoc_setup; | |
640 | master->bus_num = pdev->id; | |
94b1f0df | 641 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_CS_HIGH; |
24778be2 SW |
642 | master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(12) | |
643 | SPI_BPW_MASK(16) | SPI_BPW_MASK(32); | |
1cc2df9d ZS |
644 | sspi->bitbang.master->dev.of_node = pdev->dev.of_node; |
645 | ||
de39f5fa BS |
646 | /* request DMA channels */ |
647 | dma_cap_zero(dma_cap_mask); | |
648 | dma_cap_set(DMA_INTERLEAVE, dma_cap_mask); | |
649 | ||
650 | sspi->rx_chan = dma_request_channel(dma_cap_mask, (dma_filter_fn)sirfsoc_dma_filter_id, | |
651 | (void *)rx_dma_ch); | |
652 | if (!sspi->rx_chan) { | |
653 | dev_err(&pdev->dev, "can not allocate rx dma channel\n"); | |
6cca9e2d | 654 | ret = -ENODEV; |
de39f5fa BS |
655 | goto free_master; |
656 | } | |
657 | sspi->tx_chan = dma_request_channel(dma_cap_mask, (dma_filter_fn)sirfsoc_dma_filter_id, | |
658 | (void *)tx_dma_ch); | |
659 | if (!sspi->tx_chan) { | |
660 | dev_err(&pdev->dev, "can not allocate tx dma channel\n"); | |
6cca9e2d | 661 | ret = -ENODEV; |
de39f5fa BS |
662 | goto free_rx_dma; |
663 | } | |
664 | ||
1cc2df9d ZS |
665 | sspi->clk = clk_get(&pdev->dev, NULL); |
666 | if (IS_ERR(sspi->clk)) { | |
de39f5fa BS |
667 | ret = PTR_ERR(sspi->clk); |
668 | goto free_tx_dma; | |
1cc2df9d | 669 | } |
e5118cd2 | 670 | clk_prepare_enable(sspi->clk); |
1cc2df9d ZS |
671 | sspi->ctrl_freq = clk_get_rate(sspi->clk); |
672 | ||
de39f5fa BS |
673 | init_completion(&sspi->rx_done); |
674 | init_completion(&sspi->tx_done); | |
1cc2df9d | 675 | |
1cc2df9d ZS |
676 | writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_RXFIFO_OP); |
677 | writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_TXFIFO_OP); | |
678 | writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_RXFIFO_OP); | |
679 | writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_TXFIFO_OP); | |
680 | /* We are not using dummy delay between command and data */ | |
681 | writel(0, sspi->base + SIRFSOC_SPI_DUMMY_DELAY_CTL); | |
682 | ||
de39f5fa | 683 | sspi->dummypage = kmalloc(2 * PAGE_SIZE, GFP_KERNEL); |
6cca9e2d WY |
684 | if (!sspi->dummypage) { |
685 | ret = -ENOMEM; | |
de39f5fa | 686 | goto free_clk; |
6cca9e2d | 687 | } |
de39f5fa | 688 | |
1cc2df9d ZS |
689 | ret = spi_bitbang_start(&sspi->bitbang); |
690 | if (ret) | |
de39f5fa | 691 | goto free_dummypage; |
1cc2df9d ZS |
692 | |
693 | dev_info(&pdev->dev, "registerred, bus number = %d\n", master->bus_num); | |
694 | ||
695 | return 0; | |
de39f5fa BS |
696 | free_dummypage: |
697 | kfree(sspi->dummypage); | |
1cc2df9d | 698 | free_clk: |
e5118cd2 | 699 | clk_disable_unprepare(sspi->clk); |
1cc2df9d | 700 | clk_put(sspi->clk); |
de39f5fa BS |
701 | free_tx_dma: |
702 | dma_release_channel(sspi->tx_chan); | |
703 | free_rx_dma: | |
704 | dma_release_channel(sspi->rx_chan); | |
1cc2df9d ZS |
705 | free_master: |
706 | spi_master_put(master); | |
707 | err_cs: | |
708 | return ret; | |
709 | } | |
710 | ||
fd4a319b | 711 | static int spi_sirfsoc_remove(struct platform_device *pdev) |
1cc2df9d ZS |
712 | { |
713 | struct spi_master *master; | |
714 | struct sirfsoc_spi *sspi; | |
715 | int i; | |
716 | ||
717 | master = platform_get_drvdata(pdev); | |
718 | sspi = spi_master_get_devdata(master); | |
719 | ||
720 | spi_bitbang_stop(&sspi->bitbang); | |
721 | for (i = 0; i < master->num_chipselect; i++) { | |
722 | if (sspi->chipselect[i] > 0) | |
723 | gpio_free(sspi->chipselect[i]); | |
724 | } | |
de39f5fa | 725 | kfree(sspi->dummypage); |
e5118cd2 | 726 | clk_disable_unprepare(sspi->clk); |
1cc2df9d | 727 | clk_put(sspi->clk); |
de39f5fa BS |
728 | dma_release_channel(sspi->rx_chan); |
729 | dma_release_channel(sspi->tx_chan); | |
1cc2df9d ZS |
730 | spi_master_put(master); |
731 | return 0; | |
732 | } | |
733 | ||
734 | #ifdef CONFIG_PM | |
735 | static int spi_sirfsoc_suspend(struct device *dev) | |
736 | { | |
a1216394 | 737 | struct spi_master *master = dev_get_drvdata(dev); |
1cc2df9d ZS |
738 | struct sirfsoc_spi *sspi = spi_master_get_devdata(master); |
739 | ||
740 | clk_disable(sspi->clk); | |
741 | return 0; | |
742 | } | |
743 | ||
744 | static int spi_sirfsoc_resume(struct device *dev) | |
745 | { | |
a1216394 | 746 | struct spi_master *master = dev_get_drvdata(dev); |
1cc2df9d ZS |
747 | struct sirfsoc_spi *sspi = spi_master_get_devdata(master); |
748 | ||
749 | clk_enable(sspi->clk); | |
750 | writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_RXFIFO_OP); | |
751 | writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_TXFIFO_OP); | |
752 | writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_RXFIFO_OP); | |
753 | writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_TXFIFO_OP); | |
754 | ||
755 | return 0; | |
756 | } | |
757 | ||
758 | static const struct dev_pm_ops spi_sirfsoc_pm_ops = { | |
759 | .suspend = spi_sirfsoc_suspend, | |
760 | .resume = spi_sirfsoc_resume, | |
761 | }; | |
762 | #endif | |
763 | ||
764 | static const struct of_device_id spi_sirfsoc_of_match[] = { | |
765 | { .compatible = "sirf,prima2-spi", }, | |
f3b8a8ec | 766 | { .compatible = "sirf,marco-spi", }, |
1cc2df9d ZS |
767 | {} |
768 | }; | |
3af4ed70 | 769 | MODULE_DEVICE_TABLE(of, spi_sirfsoc_of_match); |
1cc2df9d ZS |
770 | |
771 | static struct platform_driver spi_sirfsoc_driver = { | |
772 | .driver = { | |
773 | .name = DRIVER_NAME, | |
774 | .owner = THIS_MODULE, | |
775 | #ifdef CONFIG_PM | |
776 | .pm = &spi_sirfsoc_pm_ops, | |
777 | #endif | |
778 | .of_match_table = spi_sirfsoc_of_match, | |
779 | }, | |
780 | .probe = spi_sirfsoc_probe, | |
fd4a319b | 781 | .remove = spi_sirfsoc_remove, |
1cc2df9d ZS |
782 | }; |
783 | module_platform_driver(spi_sirfsoc_driver); | |
784 | ||
785 | MODULE_DESCRIPTION("SiRF SoC SPI master driver"); | |
786 | MODULE_AUTHOR("Zhiwu Song <Zhiwu.Song@csr.com>, " | |
787 | "Barry Song <Baohua.Song@csr.com>"); | |
788 | MODULE_LICENSE("GPL v2"); |