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9952f691 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
dc4dc360 LD |
2 | /* |
3 | * SPI driver for Nvidia's Tegra20/Tegra30 SLINK Controller. | |
4 | * | |
5 | * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. | |
dc4dc360 LD |
6 | */ |
7 | ||
8 | #include <linux/clk.h> | |
9 | #include <linux/completion.h> | |
10 | #include <linux/delay.h> | |
11 | #include <linux/dmaengine.h> | |
12 | #include <linux/dma-mapping.h> | |
13 | #include <linux/dmapool.h> | |
14 | #include <linux/err.h> | |
dc4dc360 LD |
15 | #include <linux/interrupt.h> |
16 | #include <linux/io.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/kthread.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/pm_runtime.h> | |
22 | #include <linux/of.h> | |
23 | #include <linux/of_device.h> | |
ff2251e3 | 24 | #include <linux/reset.h> |
dc4dc360 | 25 | #include <linux/spi/spi.h> |
dc4dc360 LD |
26 | |
27 | #define SLINK_COMMAND 0x000 | |
28 | #define SLINK_BIT_LENGTH(x) (((x) & 0x1f) << 0) | |
29 | #define SLINK_WORD_SIZE(x) (((x) & 0x1f) << 5) | |
30 | #define SLINK_BOTH_EN (1 << 10) | |
31 | #define SLINK_CS_SW (1 << 11) | |
32 | #define SLINK_CS_VALUE (1 << 12) | |
33 | #define SLINK_CS_POLARITY (1 << 13) | |
34 | #define SLINK_IDLE_SDA_DRIVE_LOW (0 << 16) | |
35 | #define SLINK_IDLE_SDA_DRIVE_HIGH (1 << 16) | |
36 | #define SLINK_IDLE_SDA_PULL_LOW (2 << 16) | |
37 | #define SLINK_IDLE_SDA_PULL_HIGH (3 << 16) | |
38 | #define SLINK_IDLE_SDA_MASK (3 << 16) | |
39 | #define SLINK_CS_POLARITY1 (1 << 20) | |
40 | #define SLINK_CK_SDA (1 << 21) | |
41 | #define SLINK_CS_POLARITY2 (1 << 22) | |
42 | #define SLINK_CS_POLARITY3 (1 << 23) | |
43 | #define SLINK_IDLE_SCLK_DRIVE_LOW (0 << 24) | |
44 | #define SLINK_IDLE_SCLK_DRIVE_HIGH (1 << 24) | |
45 | #define SLINK_IDLE_SCLK_PULL_LOW (2 << 24) | |
46 | #define SLINK_IDLE_SCLK_PULL_HIGH (3 << 24) | |
47 | #define SLINK_IDLE_SCLK_MASK (3 << 24) | |
48 | #define SLINK_M_S (1 << 28) | |
49 | #define SLINK_WAIT (1 << 29) | |
50 | #define SLINK_GO (1 << 30) | |
51 | #define SLINK_ENB (1 << 31) | |
52 | ||
53 | #define SLINK_MODES (SLINK_IDLE_SCLK_MASK | SLINK_CK_SDA) | |
54 | ||
55 | #define SLINK_COMMAND2 0x004 | |
56 | #define SLINK_LSBFE (1 << 0) | |
57 | #define SLINK_SSOE (1 << 1) | |
58 | #define SLINK_SPIE (1 << 4) | |
59 | #define SLINK_BIDIROE (1 << 6) | |
60 | #define SLINK_MODFEN (1 << 7) | |
61 | #define SLINK_INT_SIZE(x) (((x) & 0x1f) << 8) | |
62 | #define SLINK_CS_ACTIVE_BETWEEN (1 << 17) | |
63 | #define SLINK_SS_EN_CS(x) (((x) & 0x3) << 18) | |
64 | #define SLINK_SS_SETUP(x) (((x) & 0x3) << 20) | |
65 | #define SLINK_FIFO_REFILLS_0 (0 << 22) | |
66 | #define SLINK_FIFO_REFILLS_1 (1 << 22) | |
67 | #define SLINK_FIFO_REFILLS_2 (2 << 22) | |
68 | #define SLINK_FIFO_REFILLS_3 (3 << 22) | |
69 | #define SLINK_FIFO_REFILLS_MASK (3 << 22) | |
70 | #define SLINK_WAIT_PACK_INT(x) (((x) & 0x7) << 26) | |
71 | #define SLINK_SPC0 (1 << 29) | |
72 | #define SLINK_TXEN (1 << 30) | |
73 | #define SLINK_RXEN (1 << 31) | |
74 | ||
75 | #define SLINK_STATUS 0x008 | |
76 | #define SLINK_COUNT(val) (((val) >> 0) & 0x1f) | |
77 | #define SLINK_WORD(val) (((val) >> 5) & 0x1f) | |
78 | #define SLINK_BLK_CNT(val) (((val) >> 0) & 0xffff) | |
79 | #define SLINK_MODF (1 << 16) | |
80 | #define SLINK_RX_UNF (1 << 18) | |
81 | #define SLINK_TX_OVF (1 << 19) | |
82 | #define SLINK_TX_FULL (1 << 20) | |
83 | #define SLINK_TX_EMPTY (1 << 21) | |
84 | #define SLINK_RX_FULL (1 << 22) | |
85 | #define SLINK_RX_EMPTY (1 << 23) | |
86 | #define SLINK_TX_UNF (1 << 24) | |
87 | #define SLINK_RX_OVF (1 << 25) | |
88 | #define SLINK_TX_FLUSH (1 << 26) | |
89 | #define SLINK_RX_FLUSH (1 << 27) | |
90 | #define SLINK_SCLK (1 << 28) | |
91 | #define SLINK_ERR (1 << 29) | |
92 | #define SLINK_RDY (1 << 30) | |
93 | #define SLINK_BSY (1 << 31) | |
94 | #define SLINK_FIFO_ERROR (SLINK_TX_OVF | SLINK_RX_UNF | \ | |
95 | SLINK_TX_UNF | SLINK_RX_OVF) | |
96 | ||
97 | #define SLINK_FIFO_EMPTY (SLINK_TX_EMPTY | SLINK_RX_EMPTY) | |
98 | ||
99 | #define SLINK_MAS_DATA 0x010 | |
100 | #define SLINK_SLAVE_DATA 0x014 | |
101 | ||
102 | #define SLINK_DMA_CTL 0x018 | |
103 | #define SLINK_DMA_BLOCK_SIZE(x) (((x) & 0xffff) << 0) | |
104 | #define SLINK_TX_TRIG_1 (0 << 16) | |
105 | #define SLINK_TX_TRIG_4 (1 << 16) | |
106 | #define SLINK_TX_TRIG_8 (2 << 16) | |
107 | #define SLINK_TX_TRIG_16 (3 << 16) | |
108 | #define SLINK_TX_TRIG_MASK (3 << 16) | |
109 | #define SLINK_RX_TRIG_1 (0 << 18) | |
110 | #define SLINK_RX_TRIG_4 (1 << 18) | |
111 | #define SLINK_RX_TRIG_8 (2 << 18) | |
112 | #define SLINK_RX_TRIG_16 (3 << 18) | |
113 | #define SLINK_RX_TRIG_MASK (3 << 18) | |
114 | #define SLINK_PACKED (1 << 20) | |
115 | #define SLINK_PACK_SIZE_4 (0 << 21) | |
116 | #define SLINK_PACK_SIZE_8 (1 << 21) | |
117 | #define SLINK_PACK_SIZE_16 (2 << 21) | |
118 | #define SLINK_PACK_SIZE_32 (3 << 21) | |
119 | #define SLINK_PACK_SIZE_MASK (3 << 21) | |
120 | #define SLINK_IE_TXC (1 << 26) | |
121 | #define SLINK_IE_RXC (1 << 27) | |
122 | #define SLINK_DMA_EN (1 << 31) | |
123 | ||
124 | #define SLINK_STATUS2 0x01c | |
125 | #define SLINK_TX_FIFO_EMPTY_COUNT(val) (((val) & 0x3f) >> 0) | |
126 | #define SLINK_RX_FIFO_FULL_COUNT(val) (((val) & 0x3f0000) >> 16) | |
127 | #define SLINK_SS_HOLD_TIME(val) (((val) & 0xF) << 6) | |
128 | ||
129 | #define SLINK_TX_FIFO 0x100 | |
130 | #define SLINK_RX_FIFO 0x180 | |
131 | ||
132 | #define DATA_DIR_TX (1 << 0) | |
133 | #define DATA_DIR_RX (1 << 1) | |
134 | ||
135 | #define SLINK_DMA_TIMEOUT (msecs_to_jiffies(1000)) | |
136 | ||
137 | #define DEFAULT_SPI_DMA_BUF_LEN (16*1024) | |
138 | #define TX_FIFO_EMPTY_COUNT_MAX SLINK_TX_FIFO_EMPTY_COUNT(0x20) | |
139 | #define RX_FIFO_FULL_COUNT_ZERO SLINK_RX_FIFO_FULL_COUNT(0) | |
140 | ||
141 | #define SLINK_STATUS2_RESET \ | |
142 | (TX_FIFO_EMPTY_COUNT_MAX | RX_FIFO_FULL_COUNT_ZERO << 16) | |
143 | ||
144 | #define MAX_CHIP_SELECT 4 | |
145 | #define SLINK_FIFO_DEPTH 32 | |
146 | ||
147 | struct tegra_slink_chip_data { | |
148 | bool cs_hold_time; | |
149 | }; | |
150 | ||
151 | struct tegra_slink_data { | |
152 | struct device *dev; | |
153 | struct spi_master *master; | |
154 | const struct tegra_slink_chip_data *chip_data; | |
155 | spinlock_t lock; | |
156 | ||
157 | struct clk *clk; | |
ff2251e3 | 158 | struct reset_control *rst; |
dc4dc360 LD |
159 | void __iomem *base; |
160 | phys_addr_t phys; | |
161 | unsigned irq; | |
dc4dc360 LD |
162 | u32 cur_speed; |
163 | ||
164 | struct spi_device *cur_spi; | |
165 | unsigned cur_pos; | |
166 | unsigned cur_len; | |
167 | unsigned words_per_32bit; | |
168 | unsigned bytes_per_word; | |
169 | unsigned curr_dma_words; | |
170 | unsigned cur_direction; | |
171 | ||
172 | unsigned cur_rx_pos; | |
173 | unsigned cur_tx_pos; | |
174 | ||
175 | unsigned dma_buf_size; | |
176 | unsigned max_buf_size; | |
177 | bool is_curr_dma_xfer; | |
dc4dc360 LD |
178 | |
179 | struct completion rx_dma_complete; | |
180 | struct completion tx_dma_complete; | |
181 | ||
182 | u32 tx_status; | |
183 | u32 rx_status; | |
184 | u32 status_reg; | |
185 | bool is_packed; | |
5fd38677 | 186 | u32 packed_size; |
dc4dc360 LD |
187 | |
188 | u32 command_reg; | |
189 | u32 command2_reg; | |
190 | u32 dma_control_reg; | |
191 | u32 def_command_reg; | |
192 | u32 def_command2_reg; | |
193 | ||
194 | struct completion xfer_completion; | |
195 | struct spi_transfer *curr_xfer; | |
196 | struct dma_chan *rx_dma_chan; | |
197 | u32 *rx_dma_buf; | |
198 | dma_addr_t rx_dma_phys; | |
199 | struct dma_async_tx_descriptor *rx_dma_desc; | |
200 | ||
201 | struct dma_chan *tx_dma_chan; | |
202 | u32 *tx_dma_buf; | |
203 | dma_addr_t tx_dma_phys; | |
204 | struct dma_async_tx_descriptor *tx_dma_desc; | |
205 | }; | |
206 | ||
5fd38677 | 207 | static inline u32 tegra_slink_readl(struct tegra_slink_data *tspi, |
dc4dc360 LD |
208 | unsigned long reg) |
209 | { | |
210 | return readl(tspi->base + reg); | |
211 | } | |
212 | ||
213 | static inline void tegra_slink_writel(struct tegra_slink_data *tspi, | |
5fd38677 | 214 | u32 val, unsigned long reg) |
dc4dc360 LD |
215 | { |
216 | writel(val, tspi->base + reg); | |
217 | ||
218 | /* Read back register to make sure that register writes completed */ | |
219 | if (reg != SLINK_TX_FIFO) | |
220 | readl(tspi->base + SLINK_MAS_DATA); | |
221 | } | |
222 | ||
223 | static void tegra_slink_clear_status(struct tegra_slink_data *tspi) | |
224 | { | |
5fd38677 | 225 | u32 val_write; |
dc4dc360 | 226 | |
5fd38677 | 227 | tegra_slink_readl(tspi, SLINK_STATUS); |
dc4dc360 LD |
228 | |
229 | /* Write 1 to clear status register */ | |
230 | val_write = SLINK_RDY | SLINK_FIFO_ERROR; | |
231 | tegra_slink_writel(tspi, val_write, SLINK_STATUS); | |
232 | } | |
233 | ||
5fd38677 | 234 | static u32 tegra_slink_get_packed_size(struct tegra_slink_data *tspi, |
dc4dc360 LD |
235 | struct spi_transfer *t) |
236 | { | |
dc4dc360 LD |
237 | switch (tspi->bytes_per_word) { |
238 | case 0: | |
5fd38677 | 239 | return SLINK_PACK_SIZE_4; |
dc4dc360 | 240 | case 1: |
5fd38677 | 241 | return SLINK_PACK_SIZE_8; |
dc4dc360 | 242 | case 2: |
5fd38677 | 243 | return SLINK_PACK_SIZE_16; |
dc4dc360 | 244 | case 4: |
5fd38677 | 245 | return SLINK_PACK_SIZE_32; |
dc4dc360 | 246 | default: |
5fd38677 | 247 | return 0; |
dc4dc360 | 248 | } |
dc4dc360 LD |
249 | } |
250 | ||
251 | static unsigned tegra_slink_calculate_curr_xfer_param( | |
252 | struct spi_device *spi, struct tegra_slink_data *tspi, | |
253 | struct spi_transfer *t) | |
254 | { | |
255 | unsigned remain_len = t->len - tspi->cur_pos; | |
256 | unsigned max_word; | |
3cb7b407 | 257 | unsigned bits_per_word; |
dc4dc360 LD |
258 | unsigned max_len; |
259 | unsigned total_fifo_words; | |
260 | ||
766ed704 | 261 | bits_per_word = t->bits_per_word; |
e91d2352 | 262 | tspi->bytes_per_word = DIV_ROUND_UP(bits_per_word, 8); |
dc4dc360 LD |
263 | |
264 | if (bits_per_word == 8 || bits_per_word == 16) { | |
2172a332 | 265 | tspi->is_packed = true; |
dc4dc360 LD |
266 | tspi->words_per_32bit = 32/bits_per_word; |
267 | } else { | |
2172a332 | 268 | tspi->is_packed = false; |
dc4dc360 LD |
269 | tspi->words_per_32bit = 1; |
270 | } | |
271 | tspi->packed_size = tegra_slink_get_packed_size(tspi, t); | |
272 | ||
273 | if (tspi->is_packed) { | |
274 | max_len = min(remain_len, tspi->max_buf_size); | |
275 | tspi->curr_dma_words = max_len/tspi->bytes_per_word; | |
276 | total_fifo_words = max_len/4; | |
277 | } else { | |
278 | max_word = (remain_len - 1) / tspi->bytes_per_word + 1; | |
279 | max_word = min(max_word, tspi->max_buf_size/4); | |
280 | tspi->curr_dma_words = max_word; | |
281 | total_fifo_words = max_word; | |
282 | } | |
283 | return total_fifo_words; | |
284 | } | |
285 | ||
286 | static unsigned tegra_slink_fill_tx_fifo_from_client_txbuf( | |
287 | struct tegra_slink_data *tspi, struct spi_transfer *t) | |
288 | { | |
289 | unsigned nbytes; | |
290 | unsigned tx_empty_count; | |
5fd38677 | 291 | u32 fifo_status; |
dc4dc360 LD |
292 | unsigned max_n_32bit; |
293 | unsigned i, count; | |
dc4dc360 LD |
294 | unsigned int written_words; |
295 | unsigned fifo_words_left; | |
296 | u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; | |
297 | ||
298 | fifo_status = tegra_slink_readl(tspi, SLINK_STATUS2); | |
299 | tx_empty_count = SLINK_TX_FIFO_EMPTY_COUNT(fifo_status); | |
300 | ||
301 | if (tspi->is_packed) { | |
302 | fifo_words_left = tx_empty_count * tspi->words_per_32bit; | |
303 | written_words = min(fifo_words_left, tspi->curr_dma_words); | |
304 | nbytes = written_words * tspi->bytes_per_word; | |
305 | max_n_32bit = DIV_ROUND_UP(nbytes, 4); | |
306 | for (count = 0; count < max_n_32bit; count++) { | |
5fd38677 | 307 | u32 x = 0; |
dc4dc360 | 308 | for (i = 0; (i < 4) && nbytes; i++, nbytes--) |
5fd38677 | 309 | x |= (u32)(*tx_buf++) << (i * 8); |
dc4dc360 LD |
310 | tegra_slink_writel(tspi, x, SLINK_TX_FIFO); |
311 | } | |
312 | } else { | |
313 | max_n_32bit = min(tspi->curr_dma_words, tx_empty_count); | |
314 | written_words = max_n_32bit; | |
315 | nbytes = written_words * tspi->bytes_per_word; | |
316 | for (count = 0; count < max_n_32bit; count++) { | |
5fd38677 | 317 | u32 x = 0; |
dc4dc360 LD |
318 | for (i = 0; nbytes && (i < tspi->bytes_per_word); |
319 | i++, nbytes--) | |
5fd38677 | 320 | x |= (u32)(*tx_buf++) << (i * 8); |
dc4dc360 LD |
321 | tegra_slink_writel(tspi, x, SLINK_TX_FIFO); |
322 | } | |
323 | } | |
324 | tspi->cur_tx_pos += written_words * tspi->bytes_per_word; | |
325 | return written_words; | |
326 | } | |
327 | ||
328 | static unsigned int tegra_slink_read_rx_fifo_to_client_rxbuf( | |
329 | struct tegra_slink_data *tspi, struct spi_transfer *t) | |
330 | { | |
331 | unsigned rx_full_count; | |
5fd38677 | 332 | u32 fifo_status; |
dc4dc360 | 333 | unsigned i, count; |
dc4dc360 LD |
334 | unsigned int read_words = 0; |
335 | unsigned len; | |
336 | u8 *rx_buf = (u8 *)t->rx_buf + tspi->cur_rx_pos; | |
337 | ||
338 | fifo_status = tegra_slink_readl(tspi, SLINK_STATUS2); | |
339 | rx_full_count = SLINK_RX_FIFO_FULL_COUNT(fifo_status); | |
340 | if (tspi->is_packed) { | |
341 | len = tspi->curr_dma_words * tspi->bytes_per_word; | |
342 | for (count = 0; count < rx_full_count; count++) { | |
5fd38677 | 343 | u32 x = tegra_slink_readl(tspi, SLINK_RX_FIFO); |
dc4dc360 LD |
344 | for (i = 0; len && (i < 4); i++, len--) |
345 | *rx_buf++ = (x >> i*8) & 0xFF; | |
346 | } | |
347 | tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; | |
348 | read_words += tspi->curr_dma_words; | |
349 | } else { | |
dc4dc360 | 350 | for (count = 0; count < rx_full_count; count++) { |
5fd38677 | 351 | u32 x = tegra_slink_readl(tspi, SLINK_RX_FIFO); |
dc4dc360 LD |
352 | for (i = 0; (i < tspi->bytes_per_word); i++) |
353 | *rx_buf++ = (x >> (i*8)) & 0xFF; | |
354 | } | |
355 | tspi->cur_rx_pos += rx_full_count * tspi->bytes_per_word; | |
356 | read_words += rx_full_count; | |
357 | } | |
358 | return read_words; | |
359 | } | |
360 | ||
361 | static void tegra_slink_copy_client_txbuf_to_spi_txbuf( | |
362 | struct tegra_slink_data *tspi, struct spi_transfer *t) | |
363 | { | |
dc4dc360 LD |
364 | /* Make the dma buffer to read by cpu */ |
365 | dma_sync_single_for_cpu(tspi->dev, tspi->tx_dma_phys, | |
366 | tspi->dma_buf_size, DMA_TO_DEVICE); | |
367 | ||
368 | if (tspi->is_packed) { | |
5fd38677 | 369 | unsigned len = tspi->curr_dma_words * tspi->bytes_per_word; |
dc4dc360 LD |
370 | memcpy(tspi->tx_dma_buf, t->tx_buf + tspi->cur_pos, len); |
371 | } else { | |
372 | unsigned int i; | |
373 | unsigned int count; | |
374 | u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; | |
375 | unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word; | |
dc4dc360 LD |
376 | |
377 | for (count = 0; count < tspi->curr_dma_words; count++) { | |
5fd38677 | 378 | u32 x = 0; |
dc4dc360 LD |
379 | for (i = 0; consume && (i < tspi->bytes_per_word); |
380 | i++, consume--) | |
5fd38677 | 381 | x |= (u32)(*tx_buf++) << (i * 8); |
dc4dc360 LD |
382 | tspi->tx_dma_buf[count] = x; |
383 | } | |
384 | } | |
385 | tspi->cur_tx_pos += tspi->curr_dma_words * tspi->bytes_per_word; | |
386 | ||
387 | /* Make the dma buffer to read by dma */ | |
388 | dma_sync_single_for_device(tspi->dev, tspi->tx_dma_phys, | |
389 | tspi->dma_buf_size, DMA_TO_DEVICE); | |
390 | } | |
391 | ||
392 | static void tegra_slink_copy_spi_rxbuf_to_client_rxbuf( | |
393 | struct tegra_slink_data *tspi, struct spi_transfer *t) | |
394 | { | |
395 | unsigned len; | |
396 | ||
397 | /* Make the dma buffer to read by cpu */ | |
398 | dma_sync_single_for_cpu(tspi->dev, tspi->rx_dma_phys, | |
399 | tspi->dma_buf_size, DMA_FROM_DEVICE); | |
400 | ||
401 | if (tspi->is_packed) { | |
402 | len = tspi->curr_dma_words * tspi->bytes_per_word; | |
403 | memcpy(t->rx_buf + tspi->cur_rx_pos, tspi->rx_dma_buf, len); | |
404 | } else { | |
405 | unsigned int i; | |
406 | unsigned int count; | |
407 | unsigned char *rx_buf = t->rx_buf + tspi->cur_rx_pos; | |
5fd38677 | 408 | u32 rx_mask = ((u32)1 << t->bits_per_word) - 1; |
dc4dc360 | 409 | |
dc4dc360 | 410 | for (count = 0; count < tspi->curr_dma_words; count++) { |
5fd38677 | 411 | u32 x = tspi->rx_dma_buf[count] & rx_mask; |
dc4dc360 LD |
412 | for (i = 0; (i < tspi->bytes_per_word); i++) |
413 | *rx_buf++ = (x >> (i*8)) & 0xFF; | |
414 | } | |
415 | } | |
416 | tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; | |
417 | ||
418 | /* Make the dma buffer to read by dma */ | |
419 | dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys, | |
420 | tspi->dma_buf_size, DMA_FROM_DEVICE); | |
421 | } | |
422 | ||
423 | static void tegra_slink_dma_complete(void *args) | |
424 | { | |
425 | struct completion *dma_complete = args; | |
426 | ||
427 | complete(dma_complete); | |
428 | } | |
429 | ||
430 | static int tegra_slink_start_tx_dma(struct tegra_slink_data *tspi, int len) | |
431 | { | |
16735d02 | 432 | reinit_completion(&tspi->tx_dma_complete); |
dc4dc360 LD |
433 | tspi->tx_dma_desc = dmaengine_prep_slave_single(tspi->tx_dma_chan, |
434 | tspi->tx_dma_phys, len, DMA_MEM_TO_DEV, | |
72919f34 | 435 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
dc4dc360 LD |
436 | if (!tspi->tx_dma_desc) { |
437 | dev_err(tspi->dev, "Not able to get desc for Tx\n"); | |
438 | return -EIO; | |
439 | } | |
440 | ||
441 | tspi->tx_dma_desc->callback = tegra_slink_dma_complete; | |
442 | tspi->tx_dma_desc->callback_param = &tspi->tx_dma_complete; | |
443 | ||
444 | dmaengine_submit(tspi->tx_dma_desc); | |
445 | dma_async_issue_pending(tspi->tx_dma_chan); | |
446 | return 0; | |
447 | } | |
448 | ||
449 | static int tegra_slink_start_rx_dma(struct tegra_slink_data *tspi, int len) | |
450 | { | |
16735d02 | 451 | reinit_completion(&tspi->rx_dma_complete); |
dc4dc360 LD |
452 | tspi->rx_dma_desc = dmaengine_prep_slave_single(tspi->rx_dma_chan, |
453 | tspi->rx_dma_phys, len, DMA_DEV_TO_MEM, | |
72919f34 | 454 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
dc4dc360 LD |
455 | if (!tspi->rx_dma_desc) { |
456 | dev_err(tspi->dev, "Not able to get desc for Rx\n"); | |
457 | return -EIO; | |
458 | } | |
459 | ||
460 | tspi->rx_dma_desc->callback = tegra_slink_dma_complete; | |
461 | tspi->rx_dma_desc->callback_param = &tspi->rx_dma_complete; | |
462 | ||
463 | dmaengine_submit(tspi->rx_dma_desc); | |
464 | dma_async_issue_pending(tspi->rx_dma_chan); | |
465 | return 0; | |
466 | } | |
467 | ||
468 | static int tegra_slink_start_dma_based_transfer( | |
469 | struct tegra_slink_data *tspi, struct spi_transfer *t) | |
470 | { | |
5fd38677 | 471 | u32 val; |
dc4dc360 LD |
472 | unsigned int len; |
473 | int ret = 0; | |
5fd38677 | 474 | u32 status; |
dc4dc360 LD |
475 | |
476 | /* Make sure that Rx and Tx fifo are empty */ | |
477 | status = tegra_slink_readl(tspi, SLINK_STATUS); | |
478 | if ((status & SLINK_FIFO_EMPTY) != SLINK_FIFO_EMPTY) { | |
5fd38677 MN |
479 | dev_err(tspi->dev, "Rx/Tx fifo are not empty status 0x%08x\n", |
480 | (unsigned)status); | |
dc4dc360 LD |
481 | return -EIO; |
482 | } | |
483 | ||
484 | val = SLINK_DMA_BLOCK_SIZE(tspi->curr_dma_words - 1); | |
485 | val |= tspi->packed_size; | |
486 | if (tspi->is_packed) | |
487 | len = DIV_ROUND_UP(tspi->curr_dma_words * tspi->bytes_per_word, | |
488 | 4) * 4; | |
489 | else | |
490 | len = tspi->curr_dma_words * 4; | |
491 | ||
492 | /* Set attention level based on length of transfer */ | |
493 | if (len & 0xF) | |
494 | val |= SLINK_TX_TRIG_1 | SLINK_RX_TRIG_1; | |
495 | else if (((len) >> 4) & 0x1) | |
496 | val |= SLINK_TX_TRIG_4 | SLINK_RX_TRIG_4; | |
497 | else | |
498 | val |= SLINK_TX_TRIG_8 | SLINK_RX_TRIG_8; | |
499 | ||
500 | if (tspi->cur_direction & DATA_DIR_TX) | |
501 | val |= SLINK_IE_TXC; | |
502 | ||
503 | if (tspi->cur_direction & DATA_DIR_RX) | |
504 | val |= SLINK_IE_RXC; | |
505 | ||
506 | tegra_slink_writel(tspi, val, SLINK_DMA_CTL); | |
507 | tspi->dma_control_reg = val; | |
508 | ||
509 | if (tspi->cur_direction & DATA_DIR_TX) { | |
510 | tegra_slink_copy_client_txbuf_to_spi_txbuf(tspi, t); | |
511 | wmb(); | |
512 | ret = tegra_slink_start_tx_dma(tspi, len); | |
513 | if (ret < 0) { | |
514 | dev_err(tspi->dev, | |
515 | "Starting tx dma failed, err %d\n", ret); | |
516 | return ret; | |
517 | } | |
518 | ||
519 | /* Wait for tx fifo to be fill before starting slink */ | |
5fd38677 MN |
520 | status = tegra_slink_readl(tspi, SLINK_STATUS); |
521 | while (!(status & SLINK_TX_FULL)) | |
522 | status = tegra_slink_readl(tspi, SLINK_STATUS); | |
dc4dc360 LD |
523 | } |
524 | ||
525 | if (tspi->cur_direction & DATA_DIR_RX) { | |
526 | /* Make the dma buffer to read by dma */ | |
527 | dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys, | |
528 | tspi->dma_buf_size, DMA_FROM_DEVICE); | |
529 | ||
530 | ret = tegra_slink_start_rx_dma(tspi, len); | |
531 | if (ret < 0) { | |
532 | dev_err(tspi->dev, | |
533 | "Starting rx dma failed, err %d\n", ret); | |
534 | if (tspi->cur_direction & DATA_DIR_TX) | |
535 | dmaengine_terminate_all(tspi->tx_dma_chan); | |
536 | return ret; | |
537 | } | |
538 | } | |
539 | tspi->is_curr_dma_xfer = true; | |
540 | if (tspi->is_packed) { | |
541 | val |= SLINK_PACKED; | |
542 | tegra_slink_writel(tspi, val, SLINK_DMA_CTL); | |
543 | /* HW need small delay after settign Packed mode */ | |
544 | udelay(1); | |
545 | } | |
546 | tspi->dma_control_reg = val; | |
547 | ||
548 | val |= SLINK_DMA_EN; | |
549 | tegra_slink_writel(tspi, val, SLINK_DMA_CTL); | |
550 | return ret; | |
551 | } | |
552 | ||
553 | static int tegra_slink_start_cpu_based_transfer( | |
554 | struct tegra_slink_data *tspi, struct spi_transfer *t) | |
555 | { | |
5fd38677 | 556 | u32 val; |
dc4dc360 LD |
557 | unsigned cur_words; |
558 | ||
559 | val = tspi->packed_size; | |
560 | if (tspi->cur_direction & DATA_DIR_TX) | |
561 | val |= SLINK_IE_TXC; | |
562 | ||
563 | if (tspi->cur_direction & DATA_DIR_RX) | |
564 | val |= SLINK_IE_RXC; | |
565 | ||
566 | tegra_slink_writel(tspi, val, SLINK_DMA_CTL); | |
567 | tspi->dma_control_reg = val; | |
568 | ||
569 | if (tspi->cur_direction & DATA_DIR_TX) | |
570 | cur_words = tegra_slink_fill_tx_fifo_from_client_txbuf(tspi, t); | |
571 | else | |
572 | cur_words = tspi->curr_dma_words; | |
573 | val |= SLINK_DMA_BLOCK_SIZE(cur_words - 1); | |
574 | tegra_slink_writel(tspi, val, SLINK_DMA_CTL); | |
575 | tspi->dma_control_reg = val; | |
576 | ||
577 | tspi->is_curr_dma_xfer = false; | |
578 | if (tspi->is_packed) { | |
579 | val |= SLINK_PACKED; | |
580 | tegra_slink_writel(tspi, val, SLINK_DMA_CTL); | |
581 | udelay(1); | |
582 | wmb(); | |
583 | } | |
584 | tspi->dma_control_reg = val; | |
585 | val |= SLINK_DMA_EN; | |
586 | tegra_slink_writel(tspi, val, SLINK_DMA_CTL); | |
587 | return 0; | |
588 | } | |
589 | ||
590 | static int tegra_slink_init_dma_param(struct tegra_slink_data *tspi, | |
591 | bool dma_to_memory) | |
592 | { | |
593 | struct dma_chan *dma_chan; | |
594 | u32 *dma_buf; | |
595 | dma_addr_t dma_phys; | |
596 | int ret; | |
597 | struct dma_slave_config dma_sconfig; | |
dc4dc360 | 598 | |
912a7df4 | 599 | dma_chan = dma_request_chan(tspi->dev, dma_to_memory ? "rx" : "tx"); |
7708aff1 KK |
600 | if (IS_ERR(dma_chan)) |
601 | return dev_err_probe(tspi->dev, PTR_ERR(dma_chan), | |
602 | "Dma channel is not available\n"); | |
dc4dc360 LD |
603 | |
604 | dma_buf = dma_alloc_coherent(tspi->dev, tspi->dma_buf_size, | |
605 | &dma_phys, GFP_KERNEL); | |
606 | if (!dma_buf) { | |
607 | dev_err(tspi->dev, " Not able to allocate the dma buffer\n"); | |
608 | dma_release_channel(dma_chan); | |
609 | return -ENOMEM; | |
610 | } | |
611 | ||
dc4dc360 LD |
612 | if (dma_to_memory) { |
613 | dma_sconfig.src_addr = tspi->phys + SLINK_RX_FIFO; | |
614 | dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
615 | dma_sconfig.src_maxburst = 0; | |
616 | } else { | |
617 | dma_sconfig.dst_addr = tspi->phys + SLINK_TX_FIFO; | |
618 | dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
619 | dma_sconfig.dst_maxburst = 0; | |
620 | } | |
621 | ||
622 | ret = dmaengine_slave_config(dma_chan, &dma_sconfig); | |
623 | if (ret) | |
624 | goto scrub; | |
625 | if (dma_to_memory) { | |
626 | tspi->rx_dma_chan = dma_chan; | |
627 | tspi->rx_dma_buf = dma_buf; | |
628 | tspi->rx_dma_phys = dma_phys; | |
629 | } else { | |
630 | tspi->tx_dma_chan = dma_chan; | |
631 | tspi->tx_dma_buf = dma_buf; | |
632 | tspi->tx_dma_phys = dma_phys; | |
633 | } | |
634 | return 0; | |
635 | ||
636 | scrub: | |
637 | dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys); | |
638 | dma_release_channel(dma_chan); | |
639 | return ret; | |
640 | } | |
641 | ||
642 | static void tegra_slink_deinit_dma_param(struct tegra_slink_data *tspi, | |
643 | bool dma_to_memory) | |
644 | { | |
645 | u32 *dma_buf; | |
646 | dma_addr_t dma_phys; | |
647 | struct dma_chan *dma_chan; | |
648 | ||
649 | if (dma_to_memory) { | |
650 | dma_buf = tspi->rx_dma_buf; | |
651 | dma_chan = tspi->rx_dma_chan; | |
652 | dma_phys = tspi->rx_dma_phys; | |
653 | tspi->rx_dma_chan = NULL; | |
654 | tspi->rx_dma_buf = NULL; | |
655 | } else { | |
656 | dma_buf = tspi->tx_dma_buf; | |
657 | dma_chan = tspi->tx_dma_chan; | |
658 | dma_phys = tspi->tx_dma_phys; | |
659 | tspi->tx_dma_buf = NULL; | |
660 | tspi->tx_dma_chan = NULL; | |
661 | } | |
662 | if (!dma_chan) | |
663 | return; | |
664 | ||
665 | dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys); | |
666 | dma_release_channel(dma_chan); | |
667 | } | |
668 | ||
669 | static int tegra_slink_start_transfer_one(struct spi_device *spi, | |
f178e3de | 670 | struct spi_transfer *t) |
dc4dc360 LD |
671 | { |
672 | struct tegra_slink_data *tspi = spi_master_get_devdata(spi->master); | |
673 | u32 speed; | |
674 | u8 bits_per_word; | |
675 | unsigned total_fifo_words; | |
676 | int ret; | |
5fd38677 MN |
677 | u32 command; |
678 | u32 command2; | |
dc4dc360 | 679 | |
e6811d1d | 680 | bits_per_word = t->bits_per_word; |
beb96c2a | 681 | speed = t->speed_hz; |
dc4dc360 LD |
682 | if (speed != tspi->cur_speed) { |
683 | clk_set_rate(tspi->clk, speed * 4); | |
684 | tspi->cur_speed = speed; | |
685 | } | |
686 | ||
687 | tspi->cur_spi = spi; | |
688 | tspi->cur_pos = 0; | |
689 | tspi->cur_rx_pos = 0; | |
690 | tspi->cur_tx_pos = 0; | |
691 | tspi->curr_xfer = t; | |
692 | total_fifo_words = tegra_slink_calculate_curr_xfer_param(spi, tspi, t); | |
693 | ||
f178e3de MB |
694 | command = tspi->command_reg; |
695 | command &= ~SLINK_BIT_LENGTH(~0); | |
696 | command |= SLINK_BIT_LENGTH(bits_per_word - 1); | |
dc4dc360 | 697 | |
f178e3de MB |
698 | command2 = tspi->command2_reg; |
699 | command2 &= ~(SLINK_RXEN | SLINK_TXEN); | |
dc4dc360 | 700 | |
dc4dc360 LD |
701 | tspi->cur_direction = 0; |
702 | if (t->rx_buf) { | |
703 | command2 |= SLINK_RXEN; | |
704 | tspi->cur_direction |= DATA_DIR_RX; | |
705 | } | |
706 | if (t->tx_buf) { | |
707 | command2 |= SLINK_TXEN; | |
708 | tspi->cur_direction |= DATA_DIR_TX; | |
709 | } | |
0e694df3 RM |
710 | |
711 | /* | |
712 | * Writing to the command2 register bevore the command register prevents | |
713 | * a spike in chip_select line 0. This selects the chip_select line | |
714 | * before changing the chip_select value. | |
715 | */ | |
dc4dc360 LD |
716 | tegra_slink_writel(tspi, command2, SLINK_COMMAND2); |
717 | tspi->command2_reg = command2; | |
718 | ||
0e694df3 RM |
719 | tegra_slink_writel(tspi, command, SLINK_COMMAND); |
720 | tspi->command_reg = command; | |
721 | ||
dc4dc360 LD |
722 | if (total_fifo_words > SLINK_FIFO_DEPTH) |
723 | ret = tegra_slink_start_dma_based_transfer(tspi, t); | |
724 | else | |
725 | ret = tegra_slink_start_cpu_based_transfer(tspi, t); | |
726 | return ret; | |
727 | } | |
728 | ||
729 | static int tegra_slink_setup(struct spi_device *spi) | |
730 | { | |
5fd38677 | 731 | static const u32 cs_pol_bit[MAX_CHIP_SELECT] = { |
dc4dc360 LD |
732 | SLINK_CS_POLARITY, |
733 | SLINK_CS_POLARITY1, | |
734 | SLINK_CS_POLARITY2, | |
735 | SLINK_CS_POLARITY3, | |
736 | }; | |
737 | ||
5fd38677 MN |
738 | struct tegra_slink_data *tspi = spi_master_get_devdata(spi->master); |
739 | u32 val; | |
740 | unsigned long flags; | |
741 | int ret; | |
742 | ||
dc4dc360 LD |
743 | dev_dbg(&spi->dev, "setup %d bpw, %scpol, %scpha, %dHz\n", |
744 | spi->bits_per_word, | |
745 | spi->mode & SPI_CPOL ? "" : "~", | |
746 | spi->mode & SPI_CPHA ? "" : "~", | |
747 | spi->max_speed_hz); | |
748 | ||
dc4dc360 LD |
749 | ret = pm_runtime_get_sync(tspi->dev); |
750 | if (ret < 0) { | |
763eab70 | 751 | pm_runtime_put_noidle(tspi->dev); |
dc4dc360 LD |
752 | dev_err(tspi->dev, "pm runtime failed, e = %d\n", ret); |
753 | return ret; | |
754 | } | |
755 | ||
756 | spin_lock_irqsave(&tspi->lock, flags); | |
757 | val = tspi->def_command_reg; | |
758 | if (spi->mode & SPI_CS_HIGH) | |
759 | val |= cs_pol_bit[spi->chip_select]; | |
760 | else | |
761 | val &= ~cs_pol_bit[spi->chip_select]; | |
762 | tspi->def_command_reg = val; | |
763 | tegra_slink_writel(tspi, tspi->def_command_reg, SLINK_COMMAND); | |
764 | spin_unlock_irqrestore(&tspi->lock, flags); | |
765 | ||
766 | pm_runtime_put(tspi->dev); | |
767 | return 0; | |
768 | } | |
769 | ||
63fc184c MB |
770 | static int tegra_slink_prepare_message(struct spi_master *master, |
771 | struct spi_message *msg) | |
dc4dc360 | 772 | { |
dc4dc360 | 773 | struct tegra_slink_data *tspi = spi_master_get_devdata(master); |
dc4dc360 | 774 | struct spi_device *spi = msg->spi; |
dc4dc360 | 775 | |
f178e3de | 776 | tegra_slink_clear_status(tspi); |
d558c473 | 777 | |
f178e3de MB |
778 | tspi->command_reg = tspi->def_command_reg; |
779 | tspi->command_reg |= SLINK_CS_SW | SLINK_CS_VALUE; | |
dc4dc360 | 780 | |
f178e3de MB |
781 | tspi->command2_reg = tspi->def_command2_reg; |
782 | tspi->command2_reg |= SLINK_SS_EN_CS(spi->chip_select); | |
783 | ||
784 | tspi->command_reg &= ~SLINK_MODES; | |
785 | if (spi->mode & SPI_CPHA) | |
786 | tspi->command_reg |= SLINK_CK_SDA; | |
787 | ||
788 | if (spi->mode & SPI_CPOL) | |
789 | tspi->command_reg |= SLINK_IDLE_SCLK_DRIVE_HIGH; | |
790 | else | |
791 | tspi->command_reg |= SLINK_IDLE_SCLK_DRIVE_LOW; | |
d558c473 | 792 | |
63fc184c MB |
793 | return 0; |
794 | } | |
dc4dc360 | 795 | |
63fc184c MB |
796 | static int tegra_slink_transfer_one(struct spi_master *master, |
797 | struct spi_device *spi, | |
798 | struct spi_transfer *xfer) | |
799 | { | |
800 | struct tegra_slink_data *tspi = spi_master_get_devdata(master); | |
801 | int ret; | |
802 | ||
16735d02 | 803 | reinit_completion(&tspi->xfer_completion); |
f178e3de | 804 | ret = tegra_slink_start_transfer_one(spi, xfer); |
63fc184c MB |
805 | if (ret < 0) { |
806 | dev_err(tspi->dev, | |
807 | "spi can not start transfer, err %d\n", ret); | |
808 | return ret; | |
dc4dc360 | 809 | } |
f178e3de | 810 | |
63fc184c MB |
811 | ret = wait_for_completion_timeout(&tspi->xfer_completion, |
812 | SLINK_DMA_TIMEOUT); | |
813 | if (WARN_ON(ret == 0)) { | |
814 | dev_err(tspi->dev, | |
bfca7618 | 815 | "spi transfer timeout, err %d\n", ret); |
63fc184c MB |
816 | return -EIO; |
817 | } | |
818 | ||
819 | if (tspi->tx_status) | |
820 | return tspi->tx_status; | |
821 | if (tspi->rx_status) | |
822 | return tspi->rx_status; | |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
827 | static int tegra_slink_unprepare_message(struct spi_master *master, | |
828 | struct spi_message *msg) | |
829 | { | |
830 | struct tegra_slink_data *tspi = spi_master_get_devdata(master); | |
831 | ||
dc4dc360 LD |
832 | tegra_slink_writel(tspi, tspi->def_command_reg, SLINK_COMMAND); |
833 | tegra_slink_writel(tspi, tspi->def_command2_reg, SLINK_COMMAND2); | |
63fc184c MB |
834 | |
835 | return 0; | |
dc4dc360 LD |
836 | } |
837 | ||
838 | static irqreturn_t handle_cpu_based_xfer(struct tegra_slink_data *tspi) | |
839 | { | |
840 | struct spi_transfer *t = tspi->curr_xfer; | |
841 | unsigned long flags; | |
842 | ||
843 | spin_lock_irqsave(&tspi->lock, flags); | |
844 | if (tspi->tx_status || tspi->rx_status || | |
845 | (tspi->status_reg & SLINK_BSY)) { | |
846 | dev_err(tspi->dev, | |
847 | "CpuXfer ERROR bit set 0x%x\n", tspi->status_reg); | |
848 | dev_err(tspi->dev, | |
849 | "CpuXfer 0x%08x:0x%08x:0x%08x\n", tspi->command_reg, | |
850 | tspi->command2_reg, tspi->dma_control_reg); | |
ff2251e3 | 851 | reset_control_assert(tspi->rst); |
dc4dc360 | 852 | udelay(2); |
ff2251e3 | 853 | reset_control_deassert(tspi->rst); |
dc4dc360 LD |
854 | complete(&tspi->xfer_completion); |
855 | goto exit; | |
856 | } | |
857 | ||
858 | if (tspi->cur_direction & DATA_DIR_RX) | |
859 | tegra_slink_read_rx_fifo_to_client_rxbuf(tspi, t); | |
860 | ||
861 | if (tspi->cur_direction & DATA_DIR_TX) | |
862 | tspi->cur_pos = tspi->cur_tx_pos; | |
863 | else | |
864 | tspi->cur_pos = tspi->cur_rx_pos; | |
865 | ||
866 | if (tspi->cur_pos == t->len) { | |
867 | complete(&tspi->xfer_completion); | |
868 | goto exit; | |
869 | } | |
870 | ||
871 | tegra_slink_calculate_curr_xfer_param(tspi->cur_spi, tspi, t); | |
872 | tegra_slink_start_cpu_based_transfer(tspi, t); | |
873 | exit: | |
874 | spin_unlock_irqrestore(&tspi->lock, flags); | |
875 | return IRQ_HANDLED; | |
876 | } | |
877 | ||
878 | static irqreturn_t handle_dma_based_xfer(struct tegra_slink_data *tspi) | |
879 | { | |
880 | struct spi_transfer *t = tspi->curr_xfer; | |
881 | long wait_status; | |
882 | int err = 0; | |
883 | unsigned total_fifo_words; | |
884 | unsigned long flags; | |
885 | ||
886 | /* Abort dmas if any error */ | |
887 | if (tspi->cur_direction & DATA_DIR_TX) { | |
888 | if (tspi->tx_status) { | |
889 | dmaengine_terminate_all(tspi->tx_dma_chan); | |
890 | err += 1; | |
891 | } else { | |
892 | wait_status = wait_for_completion_interruptible_timeout( | |
893 | &tspi->tx_dma_complete, SLINK_DMA_TIMEOUT); | |
894 | if (wait_status <= 0) { | |
895 | dmaengine_terminate_all(tspi->tx_dma_chan); | |
896 | dev_err(tspi->dev, "TxDma Xfer failed\n"); | |
897 | err += 1; | |
898 | } | |
899 | } | |
900 | } | |
901 | ||
902 | if (tspi->cur_direction & DATA_DIR_RX) { | |
903 | if (tspi->rx_status) { | |
904 | dmaengine_terminate_all(tspi->rx_dma_chan); | |
905 | err += 2; | |
906 | } else { | |
907 | wait_status = wait_for_completion_interruptible_timeout( | |
908 | &tspi->rx_dma_complete, SLINK_DMA_TIMEOUT); | |
909 | if (wait_status <= 0) { | |
910 | dmaengine_terminate_all(tspi->rx_dma_chan); | |
911 | dev_err(tspi->dev, "RxDma Xfer failed\n"); | |
912 | err += 2; | |
913 | } | |
914 | } | |
915 | } | |
916 | ||
917 | spin_lock_irqsave(&tspi->lock, flags); | |
918 | if (err) { | |
919 | dev_err(tspi->dev, | |
920 | "DmaXfer: ERROR bit set 0x%x\n", tspi->status_reg); | |
921 | dev_err(tspi->dev, | |
922 | "DmaXfer 0x%08x:0x%08x:0x%08x\n", tspi->command_reg, | |
923 | tspi->command2_reg, tspi->dma_control_reg); | |
ff2251e3 | 924 | reset_control_assert(tspi->rst); |
dc4dc360 | 925 | udelay(2); |
ff2251e3 | 926 | reset_control_assert(tspi->rst); |
dc4dc360 LD |
927 | complete(&tspi->xfer_completion); |
928 | spin_unlock_irqrestore(&tspi->lock, flags); | |
929 | return IRQ_HANDLED; | |
930 | } | |
931 | ||
932 | if (tspi->cur_direction & DATA_DIR_RX) | |
933 | tegra_slink_copy_spi_rxbuf_to_client_rxbuf(tspi, t); | |
934 | ||
935 | if (tspi->cur_direction & DATA_DIR_TX) | |
936 | tspi->cur_pos = tspi->cur_tx_pos; | |
937 | else | |
938 | tspi->cur_pos = tspi->cur_rx_pos; | |
939 | ||
940 | if (tspi->cur_pos == t->len) { | |
941 | complete(&tspi->xfer_completion); | |
942 | goto exit; | |
943 | } | |
944 | ||
945 | /* Continue transfer in current message */ | |
946 | total_fifo_words = tegra_slink_calculate_curr_xfer_param(tspi->cur_spi, | |
947 | tspi, t); | |
948 | if (total_fifo_words > SLINK_FIFO_DEPTH) | |
949 | err = tegra_slink_start_dma_based_transfer(tspi, t); | |
950 | else | |
951 | err = tegra_slink_start_cpu_based_transfer(tspi, t); | |
952 | ||
953 | exit: | |
954 | spin_unlock_irqrestore(&tspi->lock, flags); | |
955 | return IRQ_HANDLED; | |
956 | } | |
957 | ||
958 | static irqreturn_t tegra_slink_isr_thread(int irq, void *context_data) | |
959 | { | |
960 | struct tegra_slink_data *tspi = context_data; | |
961 | ||
962 | if (!tspi->is_curr_dma_xfer) | |
963 | return handle_cpu_based_xfer(tspi); | |
964 | return handle_dma_based_xfer(tspi); | |
965 | } | |
966 | ||
967 | static irqreturn_t tegra_slink_isr(int irq, void *context_data) | |
968 | { | |
969 | struct tegra_slink_data *tspi = context_data; | |
970 | ||
971 | tspi->status_reg = tegra_slink_readl(tspi, SLINK_STATUS); | |
972 | if (tspi->cur_direction & DATA_DIR_TX) | |
973 | tspi->tx_status = tspi->status_reg & | |
974 | (SLINK_TX_OVF | SLINK_TX_UNF); | |
975 | ||
976 | if (tspi->cur_direction & DATA_DIR_RX) | |
977 | tspi->rx_status = tspi->status_reg & | |
978 | (SLINK_RX_OVF | SLINK_RX_UNF); | |
979 | tegra_slink_clear_status(tspi); | |
980 | ||
981 | return IRQ_WAKE_THREAD; | |
982 | } | |
983 | ||
8b0bebe2 | 984 | static const struct tegra_slink_chip_data tegra30_spi_cdata = { |
dc4dc360 LD |
985 | .cs_hold_time = true, |
986 | }; | |
987 | ||
8b0bebe2 | 988 | static const struct tegra_slink_chip_data tegra20_spi_cdata = { |
dc4dc360 LD |
989 | .cs_hold_time = false, |
990 | }; | |
991 | ||
b2fb1872 | 992 | static const struct of_device_id tegra_slink_of_match[] = { |
dc4dc360 | 993 | { .compatible = "nvidia,tegra30-slink", .data = &tegra30_spi_cdata, }, |
24bc8971 | 994 | { .compatible = "nvidia,tegra20-slink", .data = &tegra20_spi_cdata, }, |
dc4dc360 LD |
995 | {} |
996 | }; | |
997 | MODULE_DEVICE_TABLE(of, tegra_slink_of_match); | |
998 | ||
fd4a319b | 999 | static int tegra_slink_probe(struct platform_device *pdev) |
dc4dc360 LD |
1000 | { |
1001 | struct spi_master *master; | |
1002 | struct tegra_slink_data *tspi; | |
1003 | struct resource *r; | |
dc4dc360 LD |
1004 | int ret, spi_irq; |
1005 | const struct tegra_slink_chip_data *cdata = NULL; | |
dc4dc360 | 1006 | |
70b9fb2a | 1007 | cdata = of_device_get_match_data(&pdev->dev); |
dc4dc360 LD |
1008 | |
1009 | master = spi_alloc_master(&pdev->dev, sizeof(*tspi)); | |
1010 | if (!master) { | |
1011 | dev_err(&pdev->dev, "master allocation failed\n"); | |
1012 | return -ENOMEM; | |
1013 | } | |
1014 | ||
1015 | /* the spi->mode bits understood by this driver: */ | |
1016 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; | |
1017 | master->setup = tegra_slink_setup; | |
63fc184c MB |
1018 | master->prepare_message = tegra_slink_prepare_message; |
1019 | master->transfer_one = tegra_slink_transfer_one; | |
1020 | master->unprepare_message = tegra_slink_unprepare_message; | |
ce74ac80 | 1021 | master->auto_runtime_pm = true; |
dc4dc360 | 1022 | master->num_chipselect = MAX_CHIP_SELECT; |
dc4dc360 | 1023 | |
24b5a82c | 1024 | platform_set_drvdata(pdev, master); |
dc4dc360 LD |
1025 | tspi = spi_master_get_devdata(master); |
1026 | tspi->master = master; | |
dc4dc360 LD |
1027 | tspi->dev = &pdev->dev; |
1028 | tspi->chip_data = cdata; | |
1029 | spin_lock_init(&tspi->lock); | |
1030 | ||
3c604de4 AL |
1031 | if (of_property_read_u32(tspi->dev->of_node, "spi-max-frequency", |
1032 | &master->max_speed_hz)) | |
1033 | master->max_speed_hz = 25000000; /* 25MHz */ | |
c60fea02 | 1034 | |
dc4dc360 LD |
1035 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
1036 | if (!r) { | |
1037 | dev_err(&pdev->dev, "No IO memory resource\n"); | |
1038 | ret = -ENODEV; | |
1039 | goto exit_free_master; | |
1040 | } | |
1041 | tspi->phys = r->start; | |
b0ee5605 TR |
1042 | tspi->base = devm_ioremap_resource(&pdev->dev, r); |
1043 | if (IS_ERR(tspi->base)) { | |
1044 | ret = PTR_ERR(tspi->base); | |
dc4dc360 LD |
1045 | goto exit_free_master; |
1046 | } | |
1047 | ||
7001cab1 MZ |
1048 | /* disabled clock may cause interrupt storm upon request */ |
1049 | tspi->clk = devm_clk_get(&pdev->dev, NULL); | |
1050 | if (IS_ERR(tspi->clk)) { | |
1051 | ret = PTR_ERR(tspi->clk); | |
1052 | dev_err(&pdev->dev, "Can not get clock %d\n", ret); | |
1053 | goto exit_free_master; | |
1054 | } | |
dc4dc360 | 1055 | |
73b32756 | 1056 | tspi->rst = devm_reset_control_get_exclusive(&pdev->dev, "spi"); |
ff2251e3 SW |
1057 | if (IS_ERR(tspi->rst)) { |
1058 | dev_err(&pdev->dev, "can not get reset\n"); | |
1059 | ret = PTR_ERR(tspi->rst); | |
e4bb903f | 1060 | goto exit_free_master; |
ff2251e3 SW |
1061 | } |
1062 | ||
dc4dc360 LD |
1063 | tspi->max_buf_size = SLINK_FIFO_DEPTH << 2; |
1064 | tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN; | |
dc4dc360 | 1065 | |
a915d150 SW |
1066 | ret = tegra_slink_init_dma_param(tspi, true); |
1067 | if (ret < 0) | |
e4bb903f | 1068 | goto exit_free_master; |
a915d150 SW |
1069 | ret = tegra_slink_init_dma_param(tspi, false); |
1070 | if (ret < 0) | |
1071 | goto exit_rx_dma_free; | |
1072 | tspi->max_buf_size = tspi->dma_buf_size; | |
1073 | init_completion(&tspi->tx_dma_complete); | |
1074 | init_completion(&tspi->rx_dma_complete); | |
dc4dc360 LD |
1075 | |
1076 | init_completion(&tspi->xfer_completion); | |
1077 | ||
1078 | pm_runtime_enable(&pdev->dev); | |
e4bb903f DO |
1079 | ret = pm_runtime_resume_and_get(&pdev->dev); |
1080 | if (ret) { | |
dc4dc360 LD |
1081 | dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret); |
1082 | goto exit_pm_disable; | |
1083 | } | |
aceda401 JH |
1084 | |
1085 | reset_control_assert(tspi->rst); | |
1086 | udelay(2); | |
1087 | reset_control_deassert(tspi->rst); | |
1088 | ||
e4bb903f DO |
1089 | spi_irq = platform_get_irq(pdev, 0); |
1090 | tspi->irq = spi_irq; | |
1091 | ret = request_threaded_irq(tspi->irq, tegra_slink_isr, | |
1092 | tegra_slink_isr_thread, IRQF_ONESHOT, | |
1093 | dev_name(&pdev->dev), tspi); | |
1094 | if (ret < 0) { | |
1095 | dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n", | |
1096 | tspi->irq); | |
1097 | goto exit_pm_put; | |
1098 | } | |
1099 | ||
dc4dc360 LD |
1100 | tspi->def_command_reg = SLINK_M_S; |
1101 | tspi->def_command2_reg = SLINK_CS_ACTIVE_BETWEEN; | |
1102 | tegra_slink_writel(tspi, tspi->def_command_reg, SLINK_COMMAND); | |
1103 | tegra_slink_writel(tspi, tspi->def_command2_reg, SLINK_COMMAND2); | |
dc4dc360 LD |
1104 | |
1105 | master->dev.of_node = pdev->dev.of_node; | |
26c86341 | 1106 | ret = spi_register_master(master); |
dc4dc360 LD |
1107 | if (ret < 0) { |
1108 | dev_err(&pdev->dev, "can not register to master err %d\n", ret); | |
e4bb903f | 1109 | goto exit_free_irq; |
dc4dc360 | 1110 | } |
e4bb903f DO |
1111 | |
1112 | pm_runtime_put(&pdev->dev); | |
1113 | ||
dc4dc360 LD |
1114 | return ret; |
1115 | ||
e4bb903f DO |
1116 | exit_free_irq: |
1117 | free_irq(spi_irq, tspi); | |
1118 | exit_pm_put: | |
1119 | pm_runtime_put(&pdev->dev); | |
dc4dc360 LD |
1120 | exit_pm_disable: |
1121 | pm_runtime_disable(&pdev->dev); | |
e4bb903f | 1122 | |
dc4dc360 LD |
1123 | tegra_slink_deinit_dma_param(tspi, false); |
1124 | exit_rx_dma_free: | |
1125 | tegra_slink_deinit_dma_param(tspi, true); | |
dc4dc360 LD |
1126 | exit_free_master: |
1127 | spi_master_put(master); | |
1128 | return ret; | |
1129 | } | |
1130 | ||
fd4a319b | 1131 | static int tegra_slink_remove(struct platform_device *pdev) |
dc4dc360 | 1132 | { |
24b5a82c | 1133 | struct spi_master *master = platform_get_drvdata(pdev); |
dc4dc360 LD |
1134 | struct tegra_slink_data *tspi = spi_master_get_devdata(master); |
1135 | ||
26c86341 DO |
1136 | spi_unregister_master(master); |
1137 | ||
dc4dc360 | 1138 | free_irq(tspi->irq, tspi); |
dc4dc360 | 1139 | |
e4bb903f | 1140 | pm_runtime_disable(&pdev->dev); |
7001cab1 | 1141 | |
dc4dc360 LD |
1142 | if (tspi->tx_dma_chan) |
1143 | tegra_slink_deinit_dma_param(tspi, false); | |
1144 | ||
1145 | if (tspi->rx_dma_chan) | |
1146 | tegra_slink_deinit_dma_param(tspi, true); | |
1147 | ||
dc4dc360 LD |
1148 | return 0; |
1149 | } | |
1150 | ||
1151 | #ifdef CONFIG_PM_SLEEP | |
1152 | static int tegra_slink_suspend(struct device *dev) | |
1153 | { | |
1154 | struct spi_master *master = dev_get_drvdata(dev); | |
1155 | ||
1156 | return spi_master_suspend(master); | |
1157 | } | |
1158 | ||
1159 | static int tegra_slink_resume(struct device *dev) | |
1160 | { | |
1161 | struct spi_master *master = dev_get_drvdata(dev); | |
1162 | struct tegra_slink_data *tspi = spi_master_get_devdata(master); | |
1163 | int ret; | |
1164 | ||
1165 | ret = pm_runtime_get_sync(dev); | |
1166 | if (ret < 0) { | |
763eab70 | 1167 | pm_runtime_put_noidle(dev); |
dc4dc360 LD |
1168 | dev_err(dev, "pm runtime failed, e = %d\n", ret); |
1169 | return ret; | |
1170 | } | |
1171 | tegra_slink_writel(tspi, tspi->command_reg, SLINK_COMMAND); | |
1172 | tegra_slink_writel(tspi, tspi->command2_reg, SLINK_COMMAND2); | |
1173 | pm_runtime_put(dev); | |
1174 | ||
1175 | return spi_master_resume(master); | |
1176 | } | |
1177 | #endif | |
1178 | ||
efafec27 | 1179 | static int __maybe_unused tegra_slink_runtime_suspend(struct device *dev) |
dc4dc360 LD |
1180 | { |
1181 | struct spi_master *master = dev_get_drvdata(dev); | |
1182 | struct tegra_slink_data *tspi = spi_master_get_devdata(master); | |
1183 | ||
1184 | /* Flush all write which are in PPSB queue by reading back */ | |
1185 | tegra_slink_readl(tspi, SLINK_MAS_DATA); | |
1186 | ||
1187 | clk_disable_unprepare(tspi->clk); | |
1188 | return 0; | |
1189 | } | |
1190 | ||
ac8a6eba | 1191 | static int __maybe_unused tegra_slink_runtime_resume(struct device *dev) |
dc4dc360 LD |
1192 | { |
1193 | struct spi_master *master = dev_get_drvdata(dev); | |
1194 | struct tegra_slink_data *tspi = spi_master_get_devdata(master); | |
1195 | int ret; | |
1196 | ||
1197 | ret = clk_prepare_enable(tspi->clk); | |
1198 | if (ret < 0) { | |
1199 | dev_err(tspi->dev, "clk_prepare failed: %d\n", ret); | |
1200 | return ret; | |
1201 | } | |
1202 | return 0; | |
1203 | } | |
1204 | ||
1205 | static const struct dev_pm_ops slink_pm_ops = { | |
1206 | SET_RUNTIME_PM_OPS(tegra_slink_runtime_suspend, | |
1207 | tegra_slink_runtime_resume, NULL) | |
1208 | SET_SYSTEM_SLEEP_PM_OPS(tegra_slink_suspend, tegra_slink_resume) | |
1209 | }; | |
1210 | static struct platform_driver tegra_slink_driver = { | |
1211 | .driver = { | |
1212 | .name = "spi-tegra-slink", | |
dc4dc360 | 1213 | .pm = &slink_pm_ops, |
c60fea02 | 1214 | .of_match_table = tegra_slink_of_match, |
dc4dc360 LD |
1215 | }, |
1216 | .probe = tegra_slink_probe, | |
fd4a319b | 1217 | .remove = tegra_slink_remove, |
dc4dc360 LD |
1218 | }; |
1219 | module_platform_driver(tegra_slink_driver); | |
1220 | ||
1221 | MODULE_ALIAS("platform:spi-tegra-slink"); | |
1222 | MODULE_DESCRIPTION("NVIDIA Tegra20/Tegra30 SLINK Controller Driver"); | |
1223 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
1224 | MODULE_LICENSE("GPL v2"); |