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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> | |
1cc2df9d ZS |
25 | |
26 | #define DRIVER_NAME "sirfsoc_spi" | |
27 | ||
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 | |
48 | ||
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) | |
67 | ||
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) | |
80 | ||
81 | #define SIRFSOC_SPI_INT_MASK_ALL 0x1FFF | |
82 | ||
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) | |
93 | ||
94 | /* TX RX enable */ | |
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) | |
98 | ||
99 | #define SIRFSOC_SPI_IO_MODE_SEL BIT(0) | |
100 | #define SIRFSOC_SPI_RX_DMA_FLUSH BIT(2) | |
101 | ||
102 | /* FIFO OPs */ | |
103 | #define SIRFSOC_SPI_FIFO_RESET BIT(0) | |
104 | #define SIRFSOC_SPI_FIFO_START BIT(1) | |
105 | ||
106 | /* FIFO CTRL */ | |
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) | |
110 | ||
111 | /* FIFO Status */ | |
112 | #define SIRFSOC_SPI_FIFO_LEVEL_MASK 0xFF | |
113 | #define SIRFSOC_SPI_FIFO_FULL BIT(8) | |
114 | #define SIRFSOC_SPI_FIFO_EMPTY BIT(9) | |
115 | ||
116 | /* 256 bytes rx/tx FIFO */ | |
117 | #define SIRFSOC_SPI_FIFO_SIZE 256 | |
118 | #define SIRFSOC_SPI_DAT_FRM_LEN_MAX (64 * 1024) | |
119 | ||
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) | |
124 | ||
de39f5fa BS |
125 | /* |
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 | |
128 | */ | |
129 | ||
130 | #define ALIGNED(x) (!((u32)x & 0x3)) | |
131 | #define IS_DMA_VALID(x) (x && ALIGNED(x->tx_buf) && ALIGNED(x->rx_buf) && \ | |
692fb0fe | 132 | ALIGNED(x->len) && (x->len < 2 * PAGE_SIZE)) |
de39f5fa | 133 | |
1cc2df9d ZS |
134 | struct sirfsoc_spi { |
135 | struct spi_bitbang bitbang; | |
de39f5fa BS |
136 | struct completion rx_done; |
137 | struct completion tx_done; | |
1cc2df9d ZS |
138 | |
139 | void __iomem *base; | |
140 | u32 ctrl_freq; /* SPI controller clock speed */ | |
141 | struct clk *clk; | |
1cc2df9d ZS |
142 | |
143 | /* rx & tx bufs from the spi_transfer */ | |
144 | const void *tx; | |
145 | void *rx; | |
146 | ||
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 *); | |
151 | ||
152 | /* number of words left to be tranmitted/received */ | |
692fb0fe QL |
153 | unsigned int left_tx_word; |
154 | unsigned int left_rx_word; | |
1cc2df9d | 155 | |
de39f5fa BS |
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; | |
161 | void *dummypage; | |
162 | int word_width; /* in bytes */ | |
1cc2df9d | 163 | |
1cc2df9d ZS |
164 | int chipselect[0]; |
165 | }; | |
166 | ||
167 | static void spi_sirfsoc_rx_word_u8(struct sirfsoc_spi *sspi) | |
168 | { | |
169 | u32 data; | |
170 | u8 *rx = sspi->rx; | |
171 | ||
172 | data = readl(sspi->base + SIRFSOC_SPI_RXFIFO_DATA); | |
173 | ||
174 | if (rx) { | |
175 | *rx++ = (u8) data; | |
176 | sspi->rx = rx; | |
177 | } | |
178 | ||
692fb0fe | 179 | sspi->left_rx_word--; |
1cc2df9d ZS |
180 | } |
181 | ||
182 | static void spi_sirfsoc_tx_word_u8(struct sirfsoc_spi *sspi) | |
183 | { | |
184 | u32 data = 0; | |
185 | const u8 *tx = sspi->tx; | |
186 | ||
187 | if (tx) { | |
188 | data = *tx++; | |
189 | sspi->tx = tx; | |
190 | } | |
191 | ||
192 | writel(data, sspi->base + SIRFSOC_SPI_TXFIFO_DATA); | |
692fb0fe | 193 | sspi->left_tx_word--; |
1cc2df9d ZS |
194 | } |
195 | ||
196 | static void spi_sirfsoc_rx_word_u16(struct sirfsoc_spi *sspi) | |
197 | { | |
198 | u32 data; | |
199 | u16 *rx = sspi->rx; | |
200 | ||
201 | data = readl(sspi->base + SIRFSOC_SPI_RXFIFO_DATA); | |
202 | ||
203 | if (rx) { | |
204 | *rx++ = (u16) data; | |
205 | sspi->rx = rx; | |
206 | } | |
207 | ||
692fb0fe | 208 | sspi->left_rx_word--; |
1cc2df9d ZS |
209 | } |
210 | ||
211 | static void spi_sirfsoc_tx_word_u16(struct sirfsoc_spi *sspi) | |
212 | { | |
213 | u32 data = 0; | |
214 | const u16 *tx = sspi->tx; | |
215 | ||
216 | if (tx) { | |
217 | data = *tx++; | |
218 | sspi->tx = tx; | |
219 | } | |
220 | ||
221 | writel(data, sspi->base + SIRFSOC_SPI_TXFIFO_DATA); | |
692fb0fe | 222 | sspi->left_tx_word--; |
1cc2df9d ZS |
223 | } |
224 | ||
225 | static void spi_sirfsoc_rx_word_u32(struct sirfsoc_spi *sspi) | |
226 | { | |
227 | u32 data; | |
228 | u32 *rx = sspi->rx; | |
229 | ||
230 | data = readl(sspi->base + SIRFSOC_SPI_RXFIFO_DATA); | |
231 | ||
232 | if (rx) { | |
233 | *rx++ = (u32) data; | |
234 | sspi->rx = rx; | |
235 | } | |
236 | ||
692fb0fe | 237 | sspi->left_rx_word--; |
1cc2df9d ZS |
238 | |
239 | } | |
240 | ||
241 | static void spi_sirfsoc_tx_word_u32(struct sirfsoc_spi *sspi) | |
242 | { | |
243 | u32 data = 0; | |
244 | const u32 *tx = sspi->tx; | |
245 | ||
246 | if (tx) { | |
247 | data = *tx++; | |
248 | sspi->tx = tx; | |
249 | } | |
250 | ||
251 | writel(data, sspi->base + SIRFSOC_SPI_TXFIFO_DATA); | |
692fb0fe | 252 | sspi->left_tx_word--; |
1cc2df9d ZS |
253 | } |
254 | ||
1cc2df9d ZS |
255 | static irqreturn_t spi_sirfsoc_irq(int irq, void *dev_id) |
256 | { | |
257 | struct sirfsoc_spi *sspi = dev_id; | |
258 | u32 spi_stat = readl(sspi->base + SIRFSOC_SPI_INT_STATUS); | |
259 | ||
260 | writel(spi_stat, sspi->base + SIRFSOC_SPI_INT_STATUS); | |
261 | ||
262 | /* Error Conditions */ | |
263 | if (spi_stat & SIRFSOC_SPI_RX_OFLOW || | |
264 | spi_stat & SIRFSOC_SPI_TX_UFLOW) { | |
de39f5fa | 265 | complete(&sspi->rx_done); |
1cc2df9d ZS |
266 | writel(0x0, sspi->base + SIRFSOC_SPI_INT_EN); |
267 | } | |
268 | ||
237ce466 QL |
269 | if (spi_stat & (SIRFSOC_SPI_FRM_END |
270 | | SIRFSOC_SPI_RXFIFO_THD_REACH)) | |
1cc2df9d ZS |
271 | while (!((readl(sspi->base + SIRFSOC_SPI_RXFIFO_STATUS) |
272 | & SIRFSOC_SPI_FIFO_EMPTY)) && | |
692fb0fe | 273 | sspi->left_rx_word) |
1cc2df9d ZS |
274 | sspi->rx_word(sspi); |
275 | ||
237ce466 QL |
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)) && | |
692fb0fe | 280 | sspi->left_tx_word) |
237ce466 | 281 | sspi->tx_word(sspi); |
1cc2df9d | 282 | |
237ce466 | 283 | /* Received all words */ |
692fb0fe | 284 | if ((sspi->left_rx_word == 0) && (sspi->left_tx_word == 0)) { |
de39f5fa | 285 | complete(&sspi->rx_done); |
237ce466 QL |
286 | writel(0x0, sspi->base + SIRFSOC_SPI_INT_EN); |
287 | } | |
1cc2df9d ZS |
288 | return IRQ_HANDLED; |
289 | } | |
290 | ||
de39f5fa BS |
291 | static void spi_sirfsoc_dma_fini_callback(void *data) |
292 | { | |
293 | struct completion *dma_complete = data; | |
294 | ||
295 | complete(dma_complete); | |
296 | } | |
297 | ||
1cc2df9d ZS |
298 | static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t) |
299 | { | |
300 | struct sirfsoc_spi *sspi; | |
301 | int timeout = t->len * 10; | |
302 | sspi = spi_master_get_devdata(spi->master); | |
303 | ||
de39f5fa BS |
304 | sspi->tx = t->tx_buf ? t->tx_buf : sspi->dummypage; |
305 | sspi->rx = t->rx_buf ? t->rx_buf : sspi->dummypage; | |
692fb0fe | 306 | sspi->left_tx_word = sspi->left_rx_word = t->len / sspi->word_width; |
16735d02 WS |
307 | reinit_completion(&sspi->rx_done); |
308 | reinit_completion(&sspi->tx_done); | |
1cc2df9d ZS |
309 | |
310 | writel(SIRFSOC_SPI_INT_MASK_ALL, sspi->base + SIRFSOC_SPI_INT_STATUS); | |
311 | ||
692fb0fe | 312 | if (sspi->left_tx_word == 1) { |
1cc2df9d ZS |
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); | |
692fb0fe QL |
318 | } else if ((sspi->left_tx_word > 1) && (sspi->left_tx_word < |
319 | SIRFSOC_SPI_DAT_FRM_LEN_MAX)) { | |
1cc2df9d ZS |
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); | |
692fb0fe QL |
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); | |
1cc2df9d ZS |
328 | } else { |
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); | |
333 | } | |
334 | ||
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); | |
339 | ||
de39f5fa BS |
340 | if (IS_DMA_VALID(t)) { |
341 | struct dma_async_tx_descriptor *rx_desc, *tx_desc; | |
de39f5fa BS |
342 | |
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, | |
692fb0fe | 345 | sspi->dst_start, t->len, DMA_DEV_TO_MEM, |
de39f5fa BS |
346 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
347 | rx_desc->callback = spi_sirfsoc_dma_fini_callback; | |
348 | rx_desc->callback_param = &sspi->rx_done; | |
349 | ||
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, | |
692fb0fe | 352 | sspi->src_start, t->len, DMA_MEM_TO_DEV, |
de39f5fa BS |
353 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
354 | tx_desc->callback = spi_sirfsoc_dma_fini_callback; | |
355 | tx_desc->callback_param = &sspi->tx_done; | |
356 | ||
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); | |
361 | } else { | |
362 | /* Send the first word to trigger the whole tx/rx process */ | |
363 | sspi->tx_word(sspi); | |
364 | ||
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); | |
369 | } | |
1cc2df9d | 370 | |
1cc2df9d ZS |
371 | writel(SIRFSOC_SPI_RX_EN | SIRFSOC_SPI_TX_EN, sspi->base + SIRFSOC_SPI_TX_RX_EN); |
372 | ||
de39f5fa BS |
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) { | |
1cc2df9d | 377 | dev_err(&spi->dev, "transfer timeout\n"); |
de39f5fa BS |
378 | dmaengine_terminate_all(sspi->rx_chan); |
379 | } else | |
692fb0fe | 380 | sspi->left_rx_word = 0; |
de39f5fa BS |
381 | |
382 | /* | |
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 | |
385 | * done earlier | |
386 | */ | |
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); | |
391 | } | |
392 | } | |
393 | ||
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); | |
397 | } | |
1cc2df9d ZS |
398 | |
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); | |
404 | ||
692fb0fe | 405 | return t->len - sspi->left_rx_word * sspi->word_width; |
1cc2df9d ZS |
406 | } |
407 | ||
408 | static void spi_sirfsoc_chipselect(struct spi_device *spi, int value) | |
409 | { | |
410 | struct sirfsoc_spi *sspi = spi_master_get_devdata(spi->master); | |
411 | ||
412 | if (sspi->chipselect[spi->chip_select] == 0) { | |
413 | u32 regval = readl(sspi->base + SIRFSOC_SPI_CTRL); | |
1cc2df9d ZS |
414 | switch (value) { |
415 | case BITBANG_CS_ACTIVE: | |
416 | if (spi->mode & SPI_CS_HIGH) | |
417 | regval |= SIRFSOC_SPI_CS_IO_OUT; | |
418 | else | |
419 | regval &= ~SIRFSOC_SPI_CS_IO_OUT; | |
420 | break; | |
421 | case BITBANG_CS_INACTIVE: | |
422 | if (spi->mode & SPI_CS_HIGH) | |
423 | regval &= ~SIRFSOC_SPI_CS_IO_OUT; | |
424 | else | |
425 | regval |= SIRFSOC_SPI_CS_IO_OUT; | |
426 | break; | |
427 | } | |
428 | writel(regval, sspi->base + SIRFSOC_SPI_CTRL); | |
429 | } else { | |
430 | int gpio = sspi->chipselect[spi->chip_select]; | |
431 | gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH ? 0 : 1); | |
432 | } | |
433 | } | |
434 | ||
435 | static int | |
436 | spi_sirfsoc_setup_transfer(struct spi_device *spi, struct spi_transfer *t) | |
437 | { | |
438 | struct sirfsoc_spi *sspi; | |
439 | u8 bits_per_word = 0; | |
440 | int hz = 0; | |
441 | u32 regval; | |
442 | u32 txfifo_ctrl, rxfifo_ctrl; | |
443 | u32 fifo_size = SIRFSOC_SPI_FIFO_SIZE / 4; | |
444 | ||
445 | sspi = spi_master_get_devdata(spi->master); | |
446 | ||
766ed704 | 447 | bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word; |
1cc2df9d ZS |
448 | hz = t && t->speed_hz ? t->speed_hz : spi->max_speed_hz; |
449 | ||
1cc2df9d | 450 | regval = (sspi->ctrl_freq / (2 * hz)) - 1; |
1cc2df9d ZS |
451 | if (regval > 0xFFFF || regval < 0) { |
452 | dev_err(&spi->dev, "Speed %d not supported\n", hz); | |
453 | return -EINVAL; | |
454 | } | |
455 | ||
456 | switch (bits_per_word) { | |
457 | case 8: | |
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; | |
1cc2df9d ZS |
461 | break; |
462 | case 12: | |
463 | case 16: | |
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; | |
1cc2df9d ZS |
468 | break; |
469 | case 32: | |
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; | |
1cc2df9d | 473 | break; |
804ae438 AB |
474 | default: |
475 | BUG(); | |
1cc2df9d ZS |
476 | } |
477 | ||
8c328a26 AL |
478 | sspi->word_width = DIV_ROUND_UP(bits_per_word, 8); |
479 | txfifo_ctrl = SIRFSOC_SPI_FIFO_THD(SIRFSOC_SPI_FIFO_SIZE / 2) | | |
480 | sspi->word_width; | |
481 | rxfifo_ctrl = SIRFSOC_SPI_FIFO_THD(SIRFSOC_SPI_FIFO_SIZE / 2) | | |
482 | sspi->word_width; | |
483 | ||
1cc2df9d ZS |
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; | |
490 | ||
491 | /* | |
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. | |
494 | */ | |
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; | |
498 | else | |
499 | regval |= SIRFSOC_SPI_DRV_POS_EDGE; | |
500 | ||
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); | |
511 | ||
512 | writel(regval, sspi->base + SIRFSOC_SPI_CTRL); | |
de39f5fa BS |
513 | |
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); | |
518 | } else { | |
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); | |
522 | } | |
523 | ||
1cc2df9d ZS |
524 | return 0; |
525 | } | |
526 | ||
527 | static int spi_sirfsoc_setup(struct spi_device *spi) | |
528 | { | |
1cc2df9d ZS |
529 | if (!spi->max_speed_hz) |
530 | return -EINVAL; | |
531 | ||
1cc2df9d ZS |
532 | return spi_sirfsoc_setup_transfer(spi, NULL); |
533 | } | |
534 | ||
fd4a319b | 535 | static int spi_sirfsoc_probe(struct platform_device *pdev) |
1cc2df9d ZS |
536 | { |
537 | struct sirfsoc_spi *sspi; | |
538 | struct spi_master *master; | |
539 | struct resource *mem_res; | |
540 | int num_cs, cs_gpio, irq; | |
541 | int i; | |
542 | int ret; | |
543 | ||
544 | ret = of_property_read_u32(pdev->dev.of_node, | |
545 | "sirf,spi-num-chipselects", &num_cs); | |
546 | if (ret < 0) { | |
547 | dev_err(&pdev->dev, "Unable to get chip select number\n"); | |
548 | goto err_cs; | |
549 | } | |
550 | ||
551 | master = spi_alloc_master(&pdev->dev, sizeof(*sspi) + sizeof(int) * num_cs); | |
552 | if (!master) { | |
553 | dev_err(&pdev->dev, "Unable to allocate SPI master\n"); | |
554 | return -ENOMEM; | |
555 | } | |
556 | platform_set_drvdata(pdev, master); | |
557 | sspi = spi_master_get_devdata(master); | |
558 | ||
1cc2df9d ZS |
559 | master->num_chipselect = num_cs; |
560 | ||
561 | for (i = 0; i < master->num_chipselect; i++) { | |
562 | cs_gpio = of_get_named_gpio(pdev->dev.of_node, "cs-gpios", i); | |
563 | if (cs_gpio < 0) { | |
564 | dev_err(&pdev->dev, "can't get cs gpio from DT\n"); | |
565 | ret = -ENODEV; | |
566 | goto free_master; | |
567 | } | |
568 | ||
569 | sspi->chipselect[i] = cs_gpio; | |
570 | if (cs_gpio == 0) | |
571 | continue; /* use cs from spi controller */ | |
572 | ||
573 | ret = gpio_request(cs_gpio, DRIVER_NAME); | |
574 | if (ret) { | |
575 | while (i > 0) { | |
576 | i--; | |
577 | if (sspi->chipselect[i] > 0) | |
578 | gpio_free(sspi->chipselect[i]); | |
579 | } | |
580 | dev_err(&pdev->dev, "fail to request cs gpios\n"); | |
581 | goto free_master; | |
582 | } | |
583 | } | |
584 | ||
2479790b | 585 | mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
b0ee5605 TR |
586 | sspi->base = devm_ioremap_resource(&pdev->dev, mem_res); |
587 | if (IS_ERR(sspi->base)) { | |
588 | ret = PTR_ERR(sspi->base); | |
1cc2df9d ZS |
589 | goto free_master; |
590 | } | |
591 | ||
592 | irq = platform_get_irq(pdev, 0); | |
593 | if (irq < 0) { | |
594 | ret = -ENXIO; | |
595 | goto free_master; | |
596 | } | |
597 | ret = devm_request_irq(&pdev->dev, irq, spi_sirfsoc_irq, 0, | |
598 | DRIVER_NAME, sspi); | |
599 | if (ret) | |
600 | goto free_master; | |
601 | ||
94c69f76 | 602 | sspi->bitbang.master = master; |
1cc2df9d ZS |
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; | |
94b1f0df | 608 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_CS_HIGH; |
24778be2 SW |
609 | master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(12) | |
610 | SPI_BPW_MASK(16) | SPI_BPW_MASK(32); | |
1cc2df9d ZS |
611 | sspi->bitbang.master->dev.of_node = pdev->dev.of_node; |
612 | ||
de39f5fa | 613 | /* request DMA channels */ |
dd7243d6 | 614 | sspi->rx_chan = dma_request_slave_channel(&pdev->dev, "rx"); |
de39f5fa BS |
615 | if (!sspi->rx_chan) { |
616 | dev_err(&pdev->dev, "can not allocate rx dma channel\n"); | |
6cca9e2d | 617 | ret = -ENODEV; |
de39f5fa BS |
618 | goto free_master; |
619 | } | |
dd7243d6 | 620 | sspi->tx_chan = dma_request_slave_channel(&pdev->dev, "tx"); |
de39f5fa BS |
621 | if (!sspi->tx_chan) { |
622 | dev_err(&pdev->dev, "can not allocate tx dma channel\n"); | |
6cca9e2d | 623 | ret = -ENODEV; |
de39f5fa BS |
624 | goto free_rx_dma; |
625 | } | |
626 | ||
1cc2df9d ZS |
627 | sspi->clk = clk_get(&pdev->dev, NULL); |
628 | if (IS_ERR(sspi->clk)) { | |
de39f5fa BS |
629 | ret = PTR_ERR(sspi->clk); |
630 | goto free_tx_dma; | |
1cc2df9d | 631 | } |
e5118cd2 | 632 | clk_prepare_enable(sspi->clk); |
1cc2df9d ZS |
633 | sspi->ctrl_freq = clk_get_rate(sspi->clk); |
634 | ||
de39f5fa BS |
635 | init_completion(&sspi->rx_done); |
636 | init_completion(&sspi->tx_done); | |
1cc2df9d | 637 | |
1cc2df9d ZS |
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); | |
644 | ||
de39f5fa | 645 | sspi->dummypage = kmalloc(2 * PAGE_SIZE, GFP_KERNEL); |
6cca9e2d WY |
646 | if (!sspi->dummypage) { |
647 | ret = -ENOMEM; | |
de39f5fa | 648 | goto free_clk; |
6cca9e2d | 649 | } |
de39f5fa | 650 | |
1cc2df9d ZS |
651 | ret = spi_bitbang_start(&sspi->bitbang); |
652 | if (ret) | |
de39f5fa | 653 | goto free_dummypage; |
1cc2df9d ZS |
654 | |
655 | dev_info(&pdev->dev, "registerred, bus number = %d\n", master->bus_num); | |
656 | ||
657 | return 0; | |
de39f5fa BS |
658 | free_dummypage: |
659 | kfree(sspi->dummypage); | |
1cc2df9d | 660 | free_clk: |
e5118cd2 | 661 | clk_disable_unprepare(sspi->clk); |
1cc2df9d | 662 | clk_put(sspi->clk); |
de39f5fa BS |
663 | free_tx_dma: |
664 | dma_release_channel(sspi->tx_chan); | |
665 | free_rx_dma: | |
666 | dma_release_channel(sspi->rx_chan); | |
1cc2df9d ZS |
667 | free_master: |
668 | spi_master_put(master); | |
669 | err_cs: | |
670 | return ret; | |
671 | } | |
672 | ||
fd4a319b | 673 | static int spi_sirfsoc_remove(struct platform_device *pdev) |
1cc2df9d ZS |
674 | { |
675 | struct spi_master *master; | |
676 | struct sirfsoc_spi *sspi; | |
677 | int i; | |
678 | ||
679 | master = platform_get_drvdata(pdev); | |
680 | sspi = spi_master_get_devdata(master); | |
681 | ||
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]); | |
686 | } | |
de39f5fa | 687 | kfree(sspi->dummypage); |
e5118cd2 | 688 | clk_disable_unprepare(sspi->clk); |
1cc2df9d | 689 | clk_put(sspi->clk); |
de39f5fa BS |
690 | dma_release_channel(sspi->rx_chan); |
691 | dma_release_channel(sspi->tx_chan); | |
1cc2df9d ZS |
692 | spi_master_put(master); |
693 | return 0; | |
694 | } | |
695 | ||
facffed2 | 696 | #ifdef CONFIG_PM_SLEEP |
1cc2df9d ZS |
697 | static int spi_sirfsoc_suspend(struct device *dev) |
698 | { | |
a1216394 | 699 | struct spi_master *master = dev_get_drvdata(dev); |
1cc2df9d ZS |
700 | struct sirfsoc_spi *sspi = spi_master_get_devdata(master); |
701 | ||
702 | clk_disable(sspi->clk); | |
703 | return 0; | |
704 | } | |
705 | ||
706 | static int spi_sirfsoc_resume(struct device *dev) | |
707 | { | |
a1216394 | 708 | struct spi_master *master = dev_get_drvdata(dev); |
1cc2df9d ZS |
709 | struct sirfsoc_spi *sspi = spi_master_get_devdata(master); |
710 | ||
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); | |
716 | ||
717 | return 0; | |
718 | } | |
facffed2 | 719 | #endif |
1cc2df9d | 720 | |
71aa2e32 JH |
721 | static SIMPLE_DEV_PM_OPS(spi_sirfsoc_pm_ops, spi_sirfsoc_suspend, |
722 | spi_sirfsoc_resume); | |
1cc2df9d ZS |
723 | |
724 | static const struct of_device_id spi_sirfsoc_of_match[] = { | |
725 | { .compatible = "sirf,prima2-spi", }, | |
f3b8a8ec | 726 | { .compatible = "sirf,marco-spi", }, |
1cc2df9d ZS |
727 | {} |
728 | }; | |
3af4ed70 | 729 | MODULE_DEVICE_TABLE(of, spi_sirfsoc_of_match); |
1cc2df9d ZS |
730 | |
731 | static struct platform_driver spi_sirfsoc_driver = { | |
732 | .driver = { | |
733 | .name = DRIVER_NAME, | |
734 | .owner = THIS_MODULE, | |
1cc2df9d | 735 | .pm = &spi_sirfsoc_pm_ops, |
1cc2df9d ZS |
736 | .of_match_table = spi_sirfsoc_of_match, |
737 | }, | |
738 | .probe = spi_sirfsoc_probe, | |
fd4a319b | 739 | .remove = spi_sirfsoc_remove, |
1cc2df9d ZS |
740 | }; |
741 | module_platform_driver(spi_sirfsoc_driver); | |
742 | ||
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"); |