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f333a331 LD |
1 | /* |
2 | * SPI driver for NVIDIA's Tegra114 SPI Controller. | |
3 | * | |
4 | * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include <linux/clk.h> | |
f333a331 LD |
20 | #include <linux/completion.h> |
21 | #include <linux/delay.h> | |
22 | #include <linux/dmaengine.h> | |
23 | #include <linux/dma-mapping.h> | |
24 | #include <linux/dmapool.h> | |
25 | #include <linux/err.h> | |
f333a331 LD |
26 | #include <linux/interrupt.h> |
27 | #include <linux/io.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/kthread.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/platform_device.h> | |
32 | #include <linux/pm_runtime.h> | |
33 | #include <linux/of.h> | |
34 | #include <linux/of_device.h> | |
ff2251e3 | 35 | #include <linux/reset.h> |
f333a331 LD |
36 | #include <linux/spi/spi.h> |
37 | ||
38 | #define SPI_COMMAND1 0x000 | |
39 | #define SPI_BIT_LENGTH(x) (((x) & 0x1f) << 0) | |
40 | #define SPI_PACKED (1 << 5) | |
41 | #define SPI_TX_EN (1 << 11) | |
42 | #define SPI_RX_EN (1 << 12) | |
43 | #define SPI_BOTH_EN_BYTE (1 << 13) | |
44 | #define SPI_BOTH_EN_BIT (1 << 14) | |
45 | #define SPI_LSBYTE_FE (1 << 15) | |
46 | #define SPI_LSBIT_FE (1 << 16) | |
47 | #define SPI_BIDIROE (1 << 17) | |
48 | #define SPI_IDLE_SDA_DRIVE_LOW (0 << 18) | |
49 | #define SPI_IDLE_SDA_DRIVE_HIGH (1 << 18) | |
50 | #define SPI_IDLE_SDA_PULL_LOW (2 << 18) | |
51 | #define SPI_IDLE_SDA_PULL_HIGH (3 << 18) | |
52 | #define SPI_IDLE_SDA_MASK (3 << 18) | |
53 | #define SPI_CS_SS_VAL (1 << 20) | |
54 | #define SPI_CS_SW_HW (1 << 21) | |
55 | /* SPI_CS_POL_INACTIVE bits are default high */ | |
48c3fc93 MN |
56 | /* n from 0 to 3 */ |
57 | #define SPI_CS_POL_INACTIVE(n) (1 << (22 + (n))) | |
f333a331 LD |
58 | #define SPI_CS_POL_INACTIVE_MASK (0xF << 22) |
59 | ||
60 | #define SPI_CS_SEL_0 (0 << 26) | |
61 | #define SPI_CS_SEL_1 (1 << 26) | |
62 | #define SPI_CS_SEL_2 (2 << 26) | |
63 | #define SPI_CS_SEL_3 (3 << 26) | |
64 | #define SPI_CS_SEL_MASK (3 << 26) | |
65 | #define SPI_CS_SEL(x) (((x) & 0x3) << 26) | |
66 | #define SPI_CONTROL_MODE_0 (0 << 28) | |
67 | #define SPI_CONTROL_MODE_1 (1 << 28) | |
68 | #define SPI_CONTROL_MODE_2 (2 << 28) | |
69 | #define SPI_CONTROL_MODE_3 (3 << 28) | |
70 | #define SPI_CONTROL_MODE_MASK (3 << 28) | |
71 | #define SPI_MODE_SEL(x) (((x) & 0x3) << 28) | |
72 | #define SPI_M_S (1 << 30) | |
73 | #define SPI_PIO (1 << 31) | |
74 | ||
75 | #define SPI_COMMAND2 0x004 | |
76 | #define SPI_TX_TAP_DELAY(x) (((x) & 0x3F) << 6) | |
77 | #define SPI_RX_TAP_DELAY(x) (((x) & 0x3F) << 0) | |
78 | ||
79 | #define SPI_CS_TIMING1 0x008 | |
80 | #define SPI_SETUP_HOLD(setup, hold) (((setup) << 4) | (hold)) | |
81 | #define SPI_CS_SETUP_HOLD(reg, cs, val) \ | |
82 | ((((val) & 0xFFu) << ((cs) * 8)) | \ | |
83 | ((reg) & ~(0xFFu << ((cs) * 8)))) | |
84 | ||
85 | #define SPI_CS_TIMING2 0x00C | |
86 | #define CYCLES_BETWEEN_PACKETS_0(x) (((x) & 0x1F) << 0) | |
87 | #define CS_ACTIVE_BETWEEN_PACKETS_0 (1 << 5) | |
88 | #define CYCLES_BETWEEN_PACKETS_1(x) (((x) & 0x1F) << 8) | |
89 | #define CS_ACTIVE_BETWEEN_PACKETS_1 (1 << 13) | |
90 | #define CYCLES_BETWEEN_PACKETS_2(x) (((x) & 0x1F) << 16) | |
91 | #define CS_ACTIVE_BETWEEN_PACKETS_2 (1 << 21) | |
92 | #define CYCLES_BETWEEN_PACKETS_3(x) (((x) & 0x1F) << 24) | |
93 | #define CS_ACTIVE_BETWEEN_PACKETS_3 (1 << 29) | |
94 | #define SPI_SET_CS_ACTIVE_BETWEEN_PACKETS(reg, cs, val) \ | |
95 | (reg = (((val) & 0x1) << ((cs) * 8 + 5)) | \ | |
96 | ((reg) & ~(1 << ((cs) * 8 + 5)))) | |
97 | #define SPI_SET_CYCLES_BETWEEN_PACKETS(reg, cs, val) \ | |
98 | (reg = (((val) & 0xF) << ((cs) * 8)) | \ | |
99 | ((reg) & ~(0xF << ((cs) * 8)))) | |
100 | ||
101 | #define SPI_TRANS_STATUS 0x010 | |
102 | #define SPI_BLK_CNT(val) (((val) >> 0) & 0xFFFF) | |
103 | #define SPI_SLV_IDLE_COUNT(val) (((val) >> 16) & 0xFF) | |
104 | #define SPI_RDY (1 << 30) | |
105 | ||
106 | #define SPI_FIFO_STATUS 0x014 | |
107 | #define SPI_RX_FIFO_EMPTY (1 << 0) | |
108 | #define SPI_RX_FIFO_FULL (1 << 1) | |
109 | #define SPI_TX_FIFO_EMPTY (1 << 2) | |
110 | #define SPI_TX_FIFO_FULL (1 << 3) | |
111 | #define SPI_RX_FIFO_UNF (1 << 4) | |
112 | #define SPI_RX_FIFO_OVF (1 << 5) | |
113 | #define SPI_TX_FIFO_UNF (1 << 6) | |
114 | #define SPI_TX_FIFO_OVF (1 << 7) | |
115 | #define SPI_ERR (1 << 8) | |
116 | #define SPI_TX_FIFO_FLUSH (1 << 14) | |
117 | #define SPI_RX_FIFO_FLUSH (1 << 15) | |
118 | #define SPI_TX_FIFO_EMPTY_COUNT(val) (((val) >> 16) & 0x7F) | |
119 | #define SPI_RX_FIFO_FULL_COUNT(val) (((val) >> 23) & 0x7F) | |
120 | #define SPI_FRAME_END (1 << 30) | |
121 | #define SPI_CS_INACTIVE (1 << 31) | |
122 | ||
123 | #define SPI_FIFO_ERROR (SPI_RX_FIFO_UNF | \ | |
124 | SPI_RX_FIFO_OVF | SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF) | |
125 | #define SPI_FIFO_EMPTY (SPI_RX_FIFO_EMPTY | SPI_TX_FIFO_EMPTY) | |
126 | ||
127 | #define SPI_TX_DATA 0x018 | |
128 | #define SPI_RX_DATA 0x01C | |
129 | ||
130 | #define SPI_DMA_CTL 0x020 | |
131 | #define SPI_TX_TRIG_1 (0 << 15) | |
132 | #define SPI_TX_TRIG_4 (1 << 15) | |
133 | #define SPI_TX_TRIG_8 (2 << 15) | |
134 | #define SPI_TX_TRIG_16 (3 << 15) | |
135 | #define SPI_TX_TRIG_MASK (3 << 15) | |
136 | #define SPI_RX_TRIG_1 (0 << 19) | |
137 | #define SPI_RX_TRIG_4 (1 << 19) | |
138 | #define SPI_RX_TRIG_8 (2 << 19) | |
139 | #define SPI_RX_TRIG_16 (3 << 19) | |
140 | #define SPI_RX_TRIG_MASK (3 << 19) | |
141 | #define SPI_IE_TX (1 << 28) | |
142 | #define SPI_IE_RX (1 << 29) | |
143 | #define SPI_CONT (1 << 30) | |
144 | #define SPI_DMA (1 << 31) | |
145 | #define SPI_DMA_EN SPI_DMA | |
146 | ||
147 | #define SPI_DMA_BLK 0x024 | |
148 | #define SPI_DMA_BLK_SET(x) (((x) & 0xFFFF) << 0) | |
149 | ||
150 | #define SPI_TX_FIFO 0x108 | |
151 | #define SPI_RX_FIFO 0x188 | |
152 | #define MAX_CHIP_SELECT 4 | |
153 | #define SPI_FIFO_DEPTH 64 | |
154 | #define DATA_DIR_TX (1 << 0) | |
155 | #define DATA_DIR_RX (1 << 1) | |
156 | ||
157 | #define SPI_DMA_TIMEOUT (msecs_to_jiffies(1000)) | |
158 | #define DEFAULT_SPI_DMA_BUF_LEN (16*1024) | |
159 | #define TX_FIFO_EMPTY_COUNT_MAX SPI_TX_FIFO_EMPTY_COUNT(0x40) | |
160 | #define RX_FIFO_FULL_COUNT_ZERO SPI_RX_FIFO_FULL_COUNT(0) | |
161 | #define MAX_HOLD_CYCLES 16 | |
162 | #define SPI_DEFAULT_SPEED 25000000 | |
163 | ||
f333a331 LD |
164 | struct tegra_spi_data { |
165 | struct device *dev; | |
166 | struct spi_master *master; | |
167 | spinlock_t lock; | |
168 | ||
169 | struct clk *clk; | |
ff2251e3 | 170 | struct reset_control *rst; |
f333a331 LD |
171 | void __iomem *base; |
172 | phys_addr_t phys; | |
173 | unsigned irq; | |
f333a331 LD |
174 | u32 cur_speed; |
175 | ||
176 | struct spi_device *cur_spi; | |
f4fade12 | 177 | struct spi_device *cs_control; |
f333a331 | 178 | unsigned cur_pos; |
f333a331 LD |
179 | unsigned words_per_32bit; |
180 | unsigned bytes_per_word; | |
181 | unsigned curr_dma_words; | |
182 | unsigned cur_direction; | |
183 | ||
184 | unsigned cur_rx_pos; | |
185 | unsigned cur_tx_pos; | |
186 | ||
187 | unsigned dma_buf_size; | |
188 | unsigned max_buf_size; | |
189 | bool is_curr_dma_xfer; | |
190 | ||
191 | struct completion rx_dma_complete; | |
192 | struct completion tx_dma_complete; | |
193 | ||
194 | u32 tx_status; | |
195 | u32 rx_status; | |
196 | u32 status_reg; | |
197 | bool is_packed; | |
f333a331 LD |
198 | |
199 | u32 command1_reg; | |
200 | u32 dma_control_reg; | |
201 | u32 def_command1_reg; | |
f333a331 LD |
202 | |
203 | struct completion xfer_completion; | |
204 | struct spi_transfer *curr_xfer; | |
205 | struct dma_chan *rx_dma_chan; | |
206 | u32 *rx_dma_buf; | |
207 | dma_addr_t rx_dma_phys; | |
208 | struct dma_async_tx_descriptor *rx_dma_desc; | |
209 | ||
210 | struct dma_chan *tx_dma_chan; | |
211 | u32 *tx_dma_buf; | |
212 | dma_addr_t tx_dma_phys; | |
213 | struct dma_async_tx_descriptor *tx_dma_desc; | |
214 | }; | |
215 | ||
216 | static int tegra_spi_runtime_suspend(struct device *dev); | |
217 | static int tegra_spi_runtime_resume(struct device *dev); | |
218 | ||
48c3fc93 | 219 | static inline u32 tegra_spi_readl(struct tegra_spi_data *tspi, |
f333a331 LD |
220 | unsigned long reg) |
221 | { | |
222 | return readl(tspi->base + reg); | |
223 | } | |
224 | ||
225 | static inline void tegra_spi_writel(struct tegra_spi_data *tspi, | |
48c3fc93 | 226 | u32 val, unsigned long reg) |
f333a331 LD |
227 | { |
228 | writel(val, tspi->base + reg); | |
229 | ||
230 | /* Read back register to make sure that register writes completed */ | |
231 | if (reg != SPI_TX_FIFO) | |
232 | readl(tspi->base + SPI_COMMAND1); | |
233 | } | |
234 | ||
235 | static void tegra_spi_clear_status(struct tegra_spi_data *tspi) | |
236 | { | |
48c3fc93 | 237 | u32 val; |
f333a331 LD |
238 | |
239 | /* Write 1 to clear status register */ | |
240 | val = tegra_spi_readl(tspi, SPI_TRANS_STATUS); | |
241 | tegra_spi_writel(tspi, val, SPI_TRANS_STATUS); | |
242 | ||
243 | /* Clear fifo status error if any */ | |
244 | val = tegra_spi_readl(tspi, SPI_FIFO_STATUS); | |
245 | if (val & SPI_ERR) | |
246 | tegra_spi_writel(tspi, SPI_ERR | SPI_FIFO_ERROR, | |
247 | SPI_FIFO_STATUS); | |
248 | } | |
249 | ||
250 | static unsigned tegra_spi_calculate_curr_xfer_param( | |
251 | struct spi_device *spi, struct tegra_spi_data *tspi, | |
252 | struct spi_transfer *t) | |
253 | { | |
254 | unsigned remain_len = t->len - tspi->cur_pos; | |
255 | unsigned max_word; | |
256 | unsigned bits_per_word = t->bits_per_word; | |
257 | unsigned max_len; | |
258 | unsigned total_fifo_words; | |
259 | ||
e91d2352 | 260 | tspi->bytes_per_word = DIV_ROUND_UP(bits_per_word, 8); |
f333a331 LD |
261 | |
262 | if (bits_per_word == 8 || bits_per_word == 16) { | |
263 | tspi->is_packed = 1; | |
264 | tspi->words_per_32bit = 32/bits_per_word; | |
265 | } else { | |
266 | tspi->is_packed = 0; | |
267 | tspi->words_per_32bit = 1; | |
268 | } | |
269 | ||
270 | if (tspi->is_packed) { | |
271 | max_len = min(remain_len, tspi->max_buf_size); | |
272 | tspi->curr_dma_words = max_len/tspi->bytes_per_word; | |
273 | total_fifo_words = (max_len + 3) / 4; | |
274 | } else { | |
275 | max_word = (remain_len - 1) / tspi->bytes_per_word + 1; | |
276 | max_word = min(max_word, tspi->max_buf_size/4); | |
277 | tspi->curr_dma_words = max_word; | |
278 | total_fifo_words = max_word; | |
279 | } | |
280 | return total_fifo_words; | |
281 | } | |
282 | ||
283 | static unsigned tegra_spi_fill_tx_fifo_from_client_txbuf( | |
284 | struct tegra_spi_data *tspi, struct spi_transfer *t) | |
285 | { | |
286 | unsigned nbytes; | |
287 | unsigned tx_empty_count; | |
48c3fc93 | 288 | u32 fifo_status; |
f333a331 LD |
289 | unsigned max_n_32bit; |
290 | unsigned i, count; | |
f333a331 LD |
291 | unsigned int written_words; |
292 | unsigned fifo_words_left; | |
293 | u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; | |
294 | ||
295 | fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS); | |
296 | tx_empty_count = SPI_TX_FIFO_EMPTY_COUNT(fifo_status); | |
297 | ||
298 | if (tspi->is_packed) { | |
299 | fifo_words_left = tx_empty_count * tspi->words_per_32bit; | |
300 | written_words = min(fifo_words_left, tspi->curr_dma_words); | |
301 | nbytes = written_words * tspi->bytes_per_word; | |
302 | max_n_32bit = DIV_ROUND_UP(nbytes, 4); | |
303 | for (count = 0; count < max_n_32bit; count++) { | |
48c3fc93 | 304 | u32 x = 0; |
c19c8e75 | 305 | |
f333a331 | 306 | for (i = 0; (i < 4) && nbytes; i++, nbytes--) |
48c3fc93 | 307 | x |= (u32)(*tx_buf++) << (i * 8); |
f333a331 LD |
308 | tegra_spi_writel(tspi, x, SPI_TX_FIFO); |
309 | } | |
310 | } else { | |
311 | max_n_32bit = min(tspi->curr_dma_words, tx_empty_count); | |
312 | written_words = max_n_32bit; | |
313 | nbytes = written_words * tspi->bytes_per_word; | |
314 | for (count = 0; count < max_n_32bit; count++) { | |
48c3fc93 | 315 | u32 x = 0; |
c19c8e75 | 316 | |
f333a331 LD |
317 | for (i = 0; nbytes && (i < tspi->bytes_per_word); |
318 | i++, nbytes--) | |
48c3fc93 | 319 | x |= (u32)(*tx_buf++) << (i * 8); |
f333a331 LD |
320 | tegra_spi_writel(tspi, x, SPI_TX_FIFO); |
321 | } | |
322 | } | |
323 | tspi->cur_tx_pos += written_words * tspi->bytes_per_word; | |
324 | return written_words; | |
325 | } | |
326 | ||
327 | static unsigned int tegra_spi_read_rx_fifo_to_client_rxbuf( | |
328 | struct tegra_spi_data *tspi, struct spi_transfer *t) | |
329 | { | |
330 | unsigned rx_full_count; | |
48c3fc93 | 331 | u32 fifo_status; |
f333a331 | 332 | unsigned i, count; |
f333a331 LD |
333 | unsigned int read_words = 0; |
334 | unsigned len; | |
335 | u8 *rx_buf = (u8 *)t->rx_buf + tspi->cur_rx_pos; | |
336 | ||
337 | fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS); | |
338 | rx_full_count = SPI_RX_FIFO_FULL_COUNT(fifo_status); | |
339 | if (tspi->is_packed) { | |
340 | len = tspi->curr_dma_words * tspi->bytes_per_word; | |
341 | for (count = 0; count < rx_full_count; count++) { | |
48c3fc93 | 342 | u32 x = tegra_spi_readl(tspi, SPI_RX_FIFO); |
c19c8e75 | 343 | |
f333a331 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 { | |
48c3fc93 | 350 | u32 rx_mask = ((u32)1 << t->bits_per_word) - 1; |
c19c8e75 | 351 | |
f333a331 | 352 | for (count = 0; count < rx_full_count; count++) { |
48c3fc93 | 353 | u32 x = tegra_spi_readl(tspi, SPI_RX_FIFO) & rx_mask; |
c19c8e75 | 354 | |
f333a331 LD |
355 | for (i = 0; (i < tspi->bytes_per_word); i++) |
356 | *rx_buf++ = (x >> (i*8)) & 0xFF; | |
357 | } | |
358 | tspi->cur_rx_pos += rx_full_count * tspi->bytes_per_word; | |
359 | read_words += rx_full_count; | |
360 | } | |
361 | return read_words; | |
362 | } | |
363 | ||
364 | static void tegra_spi_copy_client_txbuf_to_spi_txbuf( | |
365 | struct tegra_spi_data *tspi, struct spi_transfer *t) | |
366 | { | |
f333a331 LD |
367 | /* Make the dma buffer to read by cpu */ |
368 | dma_sync_single_for_cpu(tspi->dev, tspi->tx_dma_phys, | |
369 | tspi->dma_buf_size, DMA_TO_DEVICE); | |
370 | ||
371 | if (tspi->is_packed) { | |
48c3fc93 | 372 | unsigned len = tspi->curr_dma_words * tspi->bytes_per_word; |
c19c8e75 | 373 | |
f333a331 LD |
374 | memcpy(tspi->tx_dma_buf, t->tx_buf + tspi->cur_pos, len); |
375 | } else { | |
376 | unsigned int i; | |
377 | unsigned int count; | |
378 | u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; | |
379 | unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word; | |
f333a331 LD |
380 | |
381 | for (count = 0; count < tspi->curr_dma_words; count++) { | |
48c3fc93 | 382 | u32 x = 0; |
c19c8e75 | 383 | |
f333a331 LD |
384 | for (i = 0; consume && (i < tspi->bytes_per_word); |
385 | i++, consume--) | |
48c3fc93 | 386 | x |= (u32)(*tx_buf++) << (i * 8); |
f333a331 LD |
387 | tspi->tx_dma_buf[count] = x; |
388 | } | |
389 | } | |
390 | tspi->cur_tx_pos += tspi->curr_dma_words * tspi->bytes_per_word; | |
391 | ||
392 | /* Make the dma buffer to read by dma */ | |
393 | dma_sync_single_for_device(tspi->dev, tspi->tx_dma_phys, | |
394 | tspi->dma_buf_size, DMA_TO_DEVICE); | |
395 | } | |
396 | ||
397 | static void tegra_spi_copy_spi_rxbuf_to_client_rxbuf( | |
398 | struct tegra_spi_data *tspi, struct spi_transfer *t) | |
399 | { | |
f333a331 LD |
400 | /* Make the dma buffer to read by cpu */ |
401 | dma_sync_single_for_cpu(tspi->dev, tspi->rx_dma_phys, | |
402 | tspi->dma_buf_size, DMA_FROM_DEVICE); | |
403 | ||
404 | if (tspi->is_packed) { | |
48c3fc93 | 405 | unsigned len = tspi->curr_dma_words * tspi->bytes_per_word; |
c19c8e75 | 406 | |
f333a331 LD |
407 | memcpy(t->rx_buf + tspi->cur_rx_pos, tspi->rx_dma_buf, len); |
408 | } else { | |
409 | unsigned int i; | |
410 | unsigned int count; | |
411 | unsigned char *rx_buf = t->rx_buf + tspi->cur_rx_pos; | |
48c3fc93 | 412 | u32 rx_mask = ((u32)1 << t->bits_per_word) - 1; |
f333a331 | 413 | |
f333a331 | 414 | for (count = 0; count < tspi->curr_dma_words; count++) { |
48c3fc93 | 415 | u32 x = tspi->rx_dma_buf[count] & rx_mask; |
c19c8e75 | 416 | |
f333a331 LD |
417 | for (i = 0; (i < tspi->bytes_per_word); i++) |
418 | *rx_buf++ = (x >> (i*8)) & 0xFF; | |
419 | } | |
420 | } | |
421 | tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; | |
422 | ||
423 | /* Make the dma buffer to read by dma */ | |
424 | dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys, | |
425 | tspi->dma_buf_size, DMA_FROM_DEVICE); | |
426 | } | |
427 | ||
428 | static void tegra_spi_dma_complete(void *args) | |
429 | { | |
430 | struct completion *dma_complete = args; | |
431 | ||
432 | complete(dma_complete); | |
433 | } | |
434 | ||
435 | static int tegra_spi_start_tx_dma(struct tegra_spi_data *tspi, int len) | |
436 | { | |
16735d02 | 437 | reinit_completion(&tspi->tx_dma_complete); |
f333a331 LD |
438 | tspi->tx_dma_desc = dmaengine_prep_slave_single(tspi->tx_dma_chan, |
439 | tspi->tx_dma_phys, len, DMA_MEM_TO_DEV, | |
440 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
441 | if (!tspi->tx_dma_desc) { | |
442 | dev_err(tspi->dev, "Not able to get desc for Tx\n"); | |
443 | return -EIO; | |
444 | } | |
445 | ||
446 | tspi->tx_dma_desc->callback = tegra_spi_dma_complete; | |
447 | tspi->tx_dma_desc->callback_param = &tspi->tx_dma_complete; | |
448 | ||
449 | dmaengine_submit(tspi->tx_dma_desc); | |
450 | dma_async_issue_pending(tspi->tx_dma_chan); | |
451 | return 0; | |
452 | } | |
453 | ||
454 | static int tegra_spi_start_rx_dma(struct tegra_spi_data *tspi, int len) | |
455 | { | |
16735d02 | 456 | reinit_completion(&tspi->rx_dma_complete); |
f333a331 LD |
457 | tspi->rx_dma_desc = dmaengine_prep_slave_single(tspi->rx_dma_chan, |
458 | tspi->rx_dma_phys, len, DMA_DEV_TO_MEM, | |
459 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
460 | if (!tspi->rx_dma_desc) { | |
461 | dev_err(tspi->dev, "Not able to get desc for Rx\n"); | |
462 | return -EIO; | |
463 | } | |
464 | ||
465 | tspi->rx_dma_desc->callback = tegra_spi_dma_complete; | |
466 | tspi->rx_dma_desc->callback_param = &tspi->rx_dma_complete; | |
467 | ||
468 | dmaengine_submit(tspi->rx_dma_desc); | |
469 | dma_async_issue_pending(tspi->rx_dma_chan); | |
470 | return 0; | |
471 | } | |
472 | ||
473 | static int tegra_spi_start_dma_based_transfer( | |
474 | struct tegra_spi_data *tspi, struct spi_transfer *t) | |
475 | { | |
48c3fc93 | 476 | u32 val; |
f333a331 LD |
477 | unsigned int len; |
478 | int ret = 0; | |
48c3fc93 | 479 | u32 status; |
f333a331 LD |
480 | |
481 | /* Make sure that Rx and Tx fifo are empty */ | |
482 | status = tegra_spi_readl(tspi, SPI_FIFO_STATUS); | |
483 | if ((status & SPI_FIFO_EMPTY) != SPI_FIFO_EMPTY) { | |
48c3fc93 MN |
484 | dev_err(tspi->dev, "Rx/Tx fifo are not empty status 0x%08x\n", |
485 | (unsigned)status); | |
f333a331 LD |
486 | return -EIO; |
487 | } | |
488 | ||
489 | val = SPI_DMA_BLK_SET(tspi->curr_dma_words - 1); | |
490 | tegra_spi_writel(tspi, val, SPI_DMA_BLK); | |
491 | ||
492 | if (tspi->is_packed) | |
493 | len = DIV_ROUND_UP(tspi->curr_dma_words * tspi->bytes_per_word, | |
494 | 4) * 4; | |
495 | else | |
496 | len = tspi->curr_dma_words * 4; | |
497 | ||
498 | /* Set attention level based on length of transfer */ | |
499 | if (len & 0xF) | |
500 | val |= SPI_TX_TRIG_1 | SPI_RX_TRIG_1; | |
501 | else if (((len) >> 4) & 0x1) | |
502 | val |= SPI_TX_TRIG_4 | SPI_RX_TRIG_4; | |
503 | else | |
504 | val |= SPI_TX_TRIG_8 | SPI_RX_TRIG_8; | |
505 | ||
506 | if (tspi->cur_direction & DATA_DIR_TX) | |
507 | val |= SPI_IE_TX; | |
508 | ||
509 | if (tspi->cur_direction & DATA_DIR_RX) | |
510 | val |= SPI_IE_RX; | |
511 | ||
512 | tegra_spi_writel(tspi, val, SPI_DMA_CTL); | |
513 | tspi->dma_control_reg = val; | |
514 | ||
515 | if (tspi->cur_direction & DATA_DIR_TX) { | |
516 | tegra_spi_copy_client_txbuf_to_spi_txbuf(tspi, t); | |
517 | ret = tegra_spi_start_tx_dma(tspi, len); | |
518 | if (ret < 0) { | |
519 | dev_err(tspi->dev, | |
520 | "Starting tx dma failed, err %d\n", ret); | |
521 | return ret; | |
522 | } | |
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_spi_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 | tspi->dma_control_reg = val; | |
541 | ||
542 | val |= SPI_DMA_EN; | |
543 | tegra_spi_writel(tspi, val, SPI_DMA_CTL); | |
544 | return ret; | |
545 | } | |
546 | ||
547 | static int tegra_spi_start_cpu_based_transfer( | |
548 | struct tegra_spi_data *tspi, struct spi_transfer *t) | |
549 | { | |
48c3fc93 | 550 | u32 val; |
f333a331 LD |
551 | unsigned cur_words; |
552 | ||
553 | if (tspi->cur_direction & DATA_DIR_TX) | |
554 | cur_words = tegra_spi_fill_tx_fifo_from_client_txbuf(tspi, t); | |
555 | else | |
556 | cur_words = tspi->curr_dma_words; | |
557 | ||
558 | val = SPI_DMA_BLK_SET(cur_words - 1); | |
559 | tegra_spi_writel(tspi, val, SPI_DMA_BLK); | |
560 | ||
561 | val = 0; | |
562 | if (tspi->cur_direction & DATA_DIR_TX) | |
563 | val |= SPI_IE_TX; | |
564 | ||
565 | if (tspi->cur_direction & DATA_DIR_RX) | |
566 | val |= SPI_IE_RX; | |
567 | ||
568 | tegra_spi_writel(tspi, val, SPI_DMA_CTL); | |
569 | tspi->dma_control_reg = val; | |
570 | ||
571 | tspi->is_curr_dma_xfer = false; | |
572 | ||
573 | val |= SPI_DMA_EN; | |
574 | tegra_spi_writel(tspi, val, SPI_DMA_CTL); | |
575 | return 0; | |
576 | } | |
577 | ||
578 | static int tegra_spi_init_dma_param(struct tegra_spi_data *tspi, | |
579 | bool dma_to_memory) | |
580 | { | |
581 | struct dma_chan *dma_chan; | |
582 | u32 *dma_buf; | |
583 | dma_addr_t dma_phys; | |
584 | int ret; | |
585 | struct dma_slave_config dma_sconfig; | |
f333a331 | 586 | |
a915d150 SW |
587 | dma_chan = dma_request_slave_channel_reason(tspi->dev, |
588 | dma_to_memory ? "rx" : "tx"); | |
589 | if (IS_ERR(dma_chan)) { | |
590 | ret = PTR_ERR(dma_chan); | |
591 | if (ret != -EPROBE_DEFER) | |
592 | dev_err(tspi->dev, | |
593 | "Dma channel is not available: %d\n", ret); | |
594 | return ret; | |
f333a331 LD |
595 | } |
596 | ||
597 | dma_buf = dma_alloc_coherent(tspi->dev, tspi->dma_buf_size, | |
598 | &dma_phys, GFP_KERNEL); | |
599 | if (!dma_buf) { | |
600 | dev_err(tspi->dev, " Not able to allocate the dma buffer\n"); | |
601 | dma_release_channel(dma_chan); | |
602 | return -ENOMEM; | |
603 | } | |
604 | ||
f333a331 LD |
605 | if (dma_to_memory) { |
606 | dma_sconfig.src_addr = tspi->phys + SPI_RX_FIFO; | |
607 | dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
608 | dma_sconfig.src_maxburst = 0; | |
609 | } else { | |
610 | dma_sconfig.dst_addr = tspi->phys + SPI_TX_FIFO; | |
611 | dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
612 | dma_sconfig.dst_maxburst = 0; | |
613 | } | |
614 | ||
615 | ret = dmaengine_slave_config(dma_chan, &dma_sconfig); | |
616 | if (ret) | |
617 | goto scrub; | |
618 | if (dma_to_memory) { | |
619 | tspi->rx_dma_chan = dma_chan; | |
620 | tspi->rx_dma_buf = dma_buf; | |
621 | tspi->rx_dma_phys = dma_phys; | |
622 | } else { | |
623 | tspi->tx_dma_chan = dma_chan; | |
624 | tspi->tx_dma_buf = dma_buf; | |
625 | tspi->tx_dma_phys = dma_phys; | |
626 | } | |
627 | return 0; | |
628 | ||
629 | scrub: | |
630 | dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys); | |
631 | dma_release_channel(dma_chan); | |
632 | return ret; | |
633 | } | |
634 | ||
635 | static void tegra_spi_deinit_dma_param(struct tegra_spi_data *tspi, | |
636 | bool dma_to_memory) | |
637 | { | |
638 | u32 *dma_buf; | |
639 | dma_addr_t dma_phys; | |
640 | struct dma_chan *dma_chan; | |
641 | ||
642 | if (dma_to_memory) { | |
643 | dma_buf = tspi->rx_dma_buf; | |
644 | dma_chan = tspi->rx_dma_chan; | |
645 | dma_phys = tspi->rx_dma_phys; | |
646 | tspi->rx_dma_chan = NULL; | |
647 | tspi->rx_dma_buf = NULL; | |
648 | } else { | |
649 | dma_buf = tspi->tx_dma_buf; | |
650 | dma_chan = tspi->tx_dma_chan; | |
651 | dma_phys = tspi->tx_dma_phys; | |
652 | tspi->tx_dma_buf = NULL; | |
653 | tspi->tx_dma_chan = NULL; | |
654 | } | |
655 | if (!dma_chan) | |
656 | return; | |
657 | ||
658 | dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys); | |
659 | dma_release_channel(dma_chan); | |
660 | } | |
661 | ||
48c3fc93 | 662 | static u32 tegra_spi_setup_transfer_one(struct spi_device *spi, |
f4fade12 | 663 | struct spi_transfer *t, bool is_first_of_msg) |
f333a331 LD |
664 | { |
665 | struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); | |
666 | u32 speed = t->speed_hz; | |
667 | u8 bits_per_word = t->bits_per_word; | |
48c3fc93 | 668 | u32 command1; |
f333a331 LD |
669 | int req_mode; |
670 | ||
671 | if (speed != tspi->cur_speed) { | |
672 | clk_set_rate(tspi->clk, speed); | |
673 | tspi->cur_speed = speed; | |
674 | } | |
675 | ||
676 | tspi->cur_spi = spi; | |
677 | tspi->cur_pos = 0; | |
678 | tspi->cur_rx_pos = 0; | |
679 | tspi->cur_tx_pos = 0; | |
680 | tspi->curr_xfer = t; | |
f333a331 LD |
681 | |
682 | if (is_first_of_msg) { | |
683 | tegra_spi_clear_status(tspi); | |
684 | ||
685 | command1 = tspi->def_command1_reg; | |
686 | command1 |= SPI_BIT_LENGTH(bits_per_word - 1); | |
687 | ||
688 | command1 &= ~SPI_CONTROL_MODE_MASK; | |
689 | req_mode = spi->mode & 0x3; | |
690 | if (req_mode == SPI_MODE_0) | |
691 | command1 |= SPI_CONTROL_MODE_0; | |
692 | else if (req_mode == SPI_MODE_1) | |
693 | command1 |= SPI_CONTROL_MODE_1; | |
694 | else if (req_mode == SPI_MODE_2) | |
695 | command1 |= SPI_CONTROL_MODE_2; | |
696 | else if (req_mode == SPI_MODE_3) | |
697 | command1 |= SPI_CONTROL_MODE_3; | |
698 | ||
f4fade12 RK |
699 | if (tspi->cs_control) { |
700 | if (tspi->cs_control != spi) | |
701 | tegra_spi_writel(tspi, command1, SPI_COMMAND1); | |
702 | tspi->cs_control = NULL; | |
703 | } else | |
704 | tegra_spi_writel(tspi, command1, SPI_COMMAND1); | |
f333a331 LD |
705 | |
706 | command1 |= SPI_CS_SW_HW; | |
707 | if (spi->mode & SPI_CS_HIGH) | |
708 | command1 |= SPI_CS_SS_VAL; | |
709 | else | |
710 | command1 &= ~SPI_CS_SS_VAL; | |
711 | ||
712 | tegra_spi_writel(tspi, 0, SPI_COMMAND2); | |
713 | } else { | |
714 | command1 = tspi->command1_reg; | |
715 | command1 &= ~SPI_BIT_LENGTH(~0); | |
716 | command1 |= SPI_BIT_LENGTH(bits_per_word - 1); | |
717 | } | |
718 | ||
f4fade12 RK |
719 | return command1; |
720 | } | |
721 | ||
722 | static int tegra_spi_start_transfer_one(struct spi_device *spi, | |
48c3fc93 | 723 | struct spi_transfer *t, u32 command1) |
f4fade12 RK |
724 | { |
725 | struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); | |
726 | unsigned total_fifo_words; | |
727 | int ret; | |
728 | ||
729 | total_fifo_words = tegra_spi_calculate_curr_xfer_param(spi, tspi, t); | |
730 | ||
f333a331 LD |
731 | if (tspi->is_packed) |
732 | command1 |= SPI_PACKED; | |
733 | ||
734 | command1 &= ~(SPI_CS_SEL_MASK | SPI_TX_EN | SPI_RX_EN); | |
735 | tspi->cur_direction = 0; | |
736 | if (t->rx_buf) { | |
737 | command1 |= SPI_RX_EN; | |
738 | tspi->cur_direction |= DATA_DIR_RX; | |
739 | } | |
740 | if (t->tx_buf) { | |
741 | command1 |= SPI_TX_EN; | |
742 | tspi->cur_direction |= DATA_DIR_TX; | |
743 | } | |
744 | command1 |= SPI_CS_SEL(spi->chip_select); | |
745 | tegra_spi_writel(tspi, command1, SPI_COMMAND1); | |
746 | tspi->command1_reg = command1; | |
747 | ||
48c3fc93 MN |
748 | dev_dbg(tspi->dev, "The def 0x%x and written 0x%x\n", |
749 | tspi->def_command1_reg, (unsigned)command1); | |
f333a331 LD |
750 | |
751 | if (total_fifo_words > SPI_FIFO_DEPTH) | |
752 | ret = tegra_spi_start_dma_based_transfer(tspi, t); | |
753 | else | |
754 | ret = tegra_spi_start_cpu_based_transfer(tspi, t); | |
755 | return ret; | |
756 | } | |
757 | ||
758 | static int tegra_spi_setup(struct spi_device *spi) | |
759 | { | |
760 | struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); | |
48c3fc93 | 761 | u32 val; |
f333a331 LD |
762 | unsigned long flags; |
763 | int ret; | |
f333a331 LD |
764 | |
765 | dev_dbg(&spi->dev, "setup %d bpw, %scpol, %scpha, %dHz\n", | |
766 | spi->bits_per_word, | |
767 | spi->mode & SPI_CPOL ? "" : "~", | |
768 | spi->mode & SPI_CPHA ? "" : "~", | |
769 | spi->max_speed_hz); | |
770 | ||
f333a331 LD |
771 | ret = pm_runtime_get_sync(tspi->dev); |
772 | if (ret < 0) { | |
773 | dev_err(tspi->dev, "pm runtime failed, e = %d\n", ret); | |
774 | return ret; | |
775 | } | |
776 | ||
777 | spin_lock_irqsave(&tspi->lock, flags); | |
778 | val = tspi->def_command1_reg; | |
779 | if (spi->mode & SPI_CS_HIGH) | |
48c3fc93 | 780 | val &= ~SPI_CS_POL_INACTIVE(spi->chip_select); |
f333a331 | 781 | else |
48c3fc93 | 782 | val |= SPI_CS_POL_INACTIVE(spi->chip_select); |
f333a331 LD |
783 | tspi->def_command1_reg = val; |
784 | tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1); | |
785 | spin_unlock_irqrestore(&tspi->lock, flags); | |
786 | ||
787 | pm_runtime_put(tspi->dev); | |
788 | return 0; | |
789 | } | |
790 | ||
f4fade12 RK |
791 | static void tegra_spi_transfer_delay(int delay) |
792 | { | |
793 | if (!delay) | |
794 | return; | |
795 | ||
796 | if (delay >= 1000) | |
797 | mdelay(delay / 1000); | |
798 | ||
799 | udelay(delay % 1000); | |
800 | } | |
801 | ||
f333a331 LD |
802 | static int tegra_spi_transfer_one_message(struct spi_master *master, |
803 | struct spi_message *msg) | |
804 | { | |
805 | bool is_first_msg = true; | |
f333a331 LD |
806 | struct tegra_spi_data *tspi = spi_master_get_devdata(master); |
807 | struct spi_transfer *xfer; | |
808 | struct spi_device *spi = msg->spi; | |
809 | int ret; | |
f4fade12 | 810 | bool skip = false; |
f333a331 LD |
811 | |
812 | msg->status = 0; | |
813 | msg->actual_length = 0; | |
814 | ||
f333a331 | 815 | list_for_each_entry(xfer, &msg->transfers, transfer_list) { |
48c3fc93 | 816 | u32 cmd1; |
f4fade12 | 817 | |
16735d02 | 818 | reinit_completion(&tspi->xfer_completion); |
f4fade12 RK |
819 | |
820 | cmd1 = tegra_spi_setup_transfer_one(spi, xfer, is_first_msg); | |
821 | ||
822 | if (!xfer->len) { | |
823 | ret = 0; | |
824 | skip = true; | |
825 | goto complete_xfer; | |
826 | } | |
827 | ||
828 | ret = tegra_spi_start_transfer_one(spi, xfer, cmd1); | |
f333a331 LD |
829 | if (ret < 0) { |
830 | dev_err(tspi->dev, | |
831 | "spi can not start transfer, err %d\n", ret); | |
f4fade12 | 832 | goto complete_xfer; |
f333a331 | 833 | } |
f4fade12 | 834 | |
f333a331 LD |
835 | is_first_msg = false; |
836 | ret = wait_for_completion_timeout(&tspi->xfer_completion, | |
837 | SPI_DMA_TIMEOUT); | |
838 | if (WARN_ON(ret == 0)) { | |
839 | dev_err(tspi->dev, | |
bfca7618 | 840 | "spi transfer timeout, err %d\n", ret); |
f333a331 | 841 | ret = -EIO; |
f4fade12 | 842 | goto complete_xfer; |
f333a331 LD |
843 | } |
844 | ||
845 | if (tspi->tx_status || tspi->rx_status) { | |
846 | dev_err(tspi->dev, "Error in Transfer\n"); | |
847 | ret = -EIO; | |
f4fade12 | 848 | goto complete_xfer; |
f333a331 LD |
849 | } |
850 | msg->actual_length += xfer->len; | |
f4fade12 RK |
851 | |
852 | complete_xfer: | |
853 | if (ret < 0 || skip) { | |
854 | tegra_spi_writel(tspi, tspi->def_command1_reg, | |
855 | SPI_COMMAND1); | |
856 | tegra_spi_transfer_delay(xfer->delay_usecs); | |
857 | goto exit; | |
971e9084 AL |
858 | } else if (list_is_last(&xfer->transfer_list, |
859 | &msg->transfers)) { | |
f4fade12 RK |
860 | if (xfer->cs_change) |
861 | tspi->cs_control = spi; | |
862 | else { | |
863 | tegra_spi_writel(tspi, tspi->def_command1_reg, | |
864 | SPI_COMMAND1); | |
865 | tegra_spi_transfer_delay(xfer->delay_usecs); | |
866 | } | |
867 | } else if (xfer->cs_change) { | |
f333a331 LD |
868 | tegra_spi_writel(tspi, tspi->def_command1_reg, |
869 | SPI_COMMAND1); | |
f4fade12 | 870 | tegra_spi_transfer_delay(xfer->delay_usecs); |
f333a331 | 871 | } |
f4fade12 | 872 | |
f333a331 LD |
873 | } |
874 | ret = 0; | |
875 | exit: | |
f333a331 LD |
876 | msg->status = ret; |
877 | spi_finalize_current_message(master); | |
878 | return ret; | |
879 | } | |
880 | ||
881 | static irqreturn_t handle_cpu_based_xfer(struct tegra_spi_data *tspi) | |
882 | { | |
883 | struct spi_transfer *t = tspi->curr_xfer; | |
884 | unsigned long flags; | |
885 | ||
886 | spin_lock_irqsave(&tspi->lock, flags); | |
887 | if (tspi->tx_status || tspi->rx_status) { | |
888 | dev_err(tspi->dev, "CpuXfer ERROR bit set 0x%x\n", | |
889 | tspi->status_reg); | |
890 | dev_err(tspi->dev, "CpuXfer 0x%08x:0x%08x\n", | |
891 | tspi->command1_reg, tspi->dma_control_reg); | |
ff2251e3 | 892 | reset_control_assert(tspi->rst); |
f333a331 | 893 | udelay(2); |
ff2251e3 | 894 | reset_control_deassert(tspi->rst); |
f333a331 LD |
895 | complete(&tspi->xfer_completion); |
896 | goto exit; | |
897 | } | |
898 | ||
899 | if (tspi->cur_direction & DATA_DIR_RX) | |
900 | tegra_spi_read_rx_fifo_to_client_rxbuf(tspi, t); | |
901 | ||
902 | if (tspi->cur_direction & DATA_DIR_TX) | |
903 | tspi->cur_pos = tspi->cur_tx_pos; | |
904 | else | |
905 | tspi->cur_pos = tspi->cur_rx_pos; | |
906 | ||
907 | if (tspi->cur_pos == t->len) { | |
908 | complete(&tspi->xfer_completion); | |
909 | goto exit; | |
910 | } | |
911 | ||
912 | tegra_spi_calculate_curr_xfer_param(tspi->cur_spi, tspi, t); | |
913 | tegra_spi_start_cpu_based_transfer(tspi, t); | |
914 | exit: | |
915 | spin_unlock_irqrestore(&tspi->lock, flags); | |
916 | return IRQ_HANDLED; | |
917 | } | |
918 | ||
919 | static irqreturn_t handle_dma_based_xfer(struct tegra_spi_data *tspi) | |
920 | { | |
921 | struct spi_transfer *t = tspi->curr_xfer; | |
922 | long wait_status; | |
923 | int err = 0; | |
924 | unsigned total_fifo_words; | |
925 | unsigned long flags; | |
926 | ||
927 | /* Abort dmas if any error */ | |
928 | if (tspi->cur_direction & DATA_DIR_TX) { | |
929 | if (tspi->tx_status) { | |
930 | dmaengine_terminate_all(tspi->tx_dma_chan); | |
931 | err += 1; | |
932 | } else { | |
933 | wait_status = wait_for_completion_interruptible_timeout( | |
934 | &tspi->tx_dma_complete, SPI_DMA_TIMEOUT); | |
935 | if (wait_status <= 0) { | |
936 | dmaengine_terminate_all(tspi->tx_dma_chan); | |
937 | dev_err(tspi->dev, "TxDma Xfer failed\n"); | |
938 | err += 1; | |
939 | } | |
940 | } | |
941 | } | |
942 | ||
943 | if (tspi->cur_direction & DATA_DIR_RX) { | |
944 | if (tspi->rx_status) { | |
945 | dmaengine_terminate_all(tspi->rx_dma_chan); | |
946 | err += 2; | |
947 | } else { | |
948 | wait_status = wait_for_completion_interruptible_timeout( | |
949 | &tspi->rx_dma_complete, SPI_DMA_TIMEOUT); | |
950 | if (wait_status <= 0) { | |
951 | dmaengine_terminate_all(tspi->rx_dma_chan); | |
952 | dev_err(tspi->dev, "RxDma Xfer failed\n"); | |
953 | err += 2; | |
954 | } | |
955 | } | |
956 | } | |
957 | ||
958 | spin_lock_irqsave(&tspi->lock, flags); | |
959 | if (err) { | |
960 | dev_err(tspi->dev, "DmaXfer: ERROR bit set 0x%x\n", | |
961 | tspi->status_reg); | |
962 | dev_err(tspi->dev, "DmaXfer 0x%08x:0x%08x\n", | |
963 | tspi->command1_reg, tspi->dma_control_reg); | |
ff2251e3 | 964 | reset_control_assert(tspi->rst); |
f333a331 | 965 | udelay(2); |
ff2251e3 | 966 | reset_control_deassert(tspi->rst); |
f333a331 LD |
967 | complete(&tspi->xfer_completion); |
968 | spin_unlock_irqrestore(&tspi->lock, flags); | |
969 | return IRQ_HANDLED; | |
970 | } | |
971 | ||
972 | if (tspi->cur_direction & DATA_DIR_RX) | |
973 | tegra_spi_copy_spi_rxbuf_to_client_rxbuf(tspi, t); | |
974 | ||
975 | if (tspi->cur_direction & DATA_DIR_TX) | |
976 | tspi->cur_pos = tspi->cur_tx_pos; | |
977 | else | |
978 | tspi->cur_pos = tspi->cur_rx_pos; | |
979 | ||
980 | if (tspi->cur_pos == t->len) { | |
981 | complete(&tspi->xfer_completion); | |
982 | goto exit; | |
983 | } | |
984 | ||
985 | /* Continue transfer in current message */ | |
986 | total_fifo_words = tegra_spi_calculate_curr_xfer_param(tspi->cur_spi, | |
987 | tspi, t); | |
988 | if (total_fifo_words > SPI_FIFO_DEPTH) | |
989 | err = tegra_spi_start_dma_based_transfer(tspi, t); | |
990 | else | |
991 | err = tegra_spi_start_cpu_based_transfer(tspi, t); | |
992 | ||
993 | exit: | |
994 | spin_unlock_irqrestore(&tspi->lock, flags); | |
995 | return IRQ_HANDLED; | |
996 | } | |
997 | ||
998 | static irqreturn_t tegra_spi_isr_thread(int irq, void *context_data) | |
999 | { | |
1000 | struct tegra_spi_data *tspi = context_data; | |
1001 | ||
1002 | if (!tspi->is_curr_dma_xfer) | |
1003 | return handle_cpu_based_xfer(tspi); | |
1004 | return handle_dma_based_xfer(tspi); | |
1005 | } | |
1006 | ||
1007 | static irqreturn_t tegra_spi_isr(int irq, void *context_data) | |
1008 | { | |
1009 | struct tegra_spi_data *tspi = context_data; | |
1010 | ||
1011 | tspi->status_reg = tegra_spi_readl(tspi, SPI_FIFO_STATUS); | |
1012 | if (tspi->cur_direction & DATA_DIR_TX) | |
1013 | tspi->tx_status = tspi->status_reg & | |
1014 | (SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF); | |
1015 | ||
1016 | if (tspi->cur_direction & DATA_DIR_RX) | |
1017 | tspi->rx_status = tspi->status_reg & | |
1018 | (SPI_RX_FIFO_OVF | SPI_RX_FIFO_UNF); | |
1019 | tegra_spi_clear_status(tspi); | |
1020 | ||
1021 | return IRQ_WAKE_THREAD; | |
1022 | } | |
1023 | ||
0ac83f39 | 1024 | static const struct of_device_id tegra_spi_of_match[] = { |
f333a331 LD |
1025 | { .compatible = "nvidia,tegra114-spi", }, |
1026 | {} | |
1027 | }; | |
1028 | MODULE_DEVICE_TABLE(of, tegra_spi_of_match); | |
1029 | ||
1030 | static int tegra_spi_probe(struct platform_device *pdev) | |
1031 | { | |
1032 | struct spi_master *master; | |
1033 | struct tegra_spi_data *tspi; | |
1034 | struct resource *r; | |
1035 | int ret, spi_irq; | |
1036 | ||
1037 | master = spi_alloc_master(&pdev->dev, sizeof(*tspi)); | |
1038 | if (!master) { | |
1039 | dev_err(&pdev->dev, "master allocation failed\n"); | |
1040 | return -ENOMEM; | |
1041 | } | |
24b5a82c | 1042 | platform_set_drvdata(pdev, master); |
f333a331 LD |
1043 | tspi = spi_master_get_devdata(master); |
1044 | ||
383840d9 AL |
1045 | if (of_property_read_u32(pdev->dev.of_node, "spi-max-frequency", |
1046 | &master->max_speed_hz)) | |
1047 | master->max_speed_hz = 25000000; /* 25MHz */ | |
f333a331 LD |
1048 | |
1049 | /* the spi->mode bits understood by this driver: */ | |
1050 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; | |
1051 | master->setup = tegra_spi_setup; | |
1052 | master->transfer_one_message = tegra_spi_transfer_one_message; | |
1053 | master->num_chipselect = MAX_CHIP_SELECT; | |
612aa5ce | 1054 | master->auto_runtime_pm = true; |
f333a331 LD |
1055 | |
1056 | tspi->master = master; | |
1057 | tspi->dev = &pdev->dev; | |
1058 | spin_lock_init(&tspi->lock); | |
1059 | ||
1060 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
f333a331 LD |
1061 | tspi->base = devm_ioremap_resource(&pdev->dev, r); |
1062 | if (IS_ERR(tspi->base)) { | |
1063 | ret = PTR_ERR(tspi->base); | |
f333a331 LD |
1064 | goto exit_free_master; |
1065 | } | |
5f7f54b5 | 1066 | tspi->phys = r->start; |
f333a331 LD |
1067 | |
1068 | spi_irq = platform_get_irq(pdev, 0); | |
1069 | tspi->irq = spi_irq; | |
1070 | ret = request_threaded_irq(tspi->irq, tegra_spi_isr, | |
1071 | tegra_spi_isr_thread, IRQF_ONESHOT, | |
1072 | dev_name(&pdev->dev), tspi); | |
1073 | if (ret < 0) { | |
1074 | dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n", | |
1075 | tspi->irq); | |
1076 | goto exit_free_master; | |
1077 | } | |
1078 | ||
1079 | tspi->clk = devm_clk_get(&pdev->dev, "spi"); | |
1080 | if (IS_ERR(tspi->clk)) { | |
1081 | dev_err(&pdev->dev, "can not get clock\n"); | |
1082 | ret = PTR_ERR(tspi->clk); | |
1083 | goto exit_free_irq; | |
1084 | } | |
1085 | ||
d006edb4 | 1086 | tspi->rst = devm_reset_control_get_exclusive(&pdev->dev, "spi"); |
ff2251e3 SW |
1087 | if (IS_ERR(tspi->rst)) { |
1088 | dev_err(&pdev->dev, "can not get reset\n"); | |
1089 | ret = PTR_ERR(tspi->rst); | |
1090 | goto exit_free_irq; | |
1091 | } | |
1092 | ||
f333a331 LD |
1093 | tspi->max_buf_size = SPI_FIFO_DEPTH << 2; |
1094 | tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN; | |
1095 | ||
a915d150 SW |
1096 | ret = tegra_spi_init_dma_param(tspi, true); |
1097 | if (ret < 0) | |
1098 | goto exit_free_irq; | |
1099 | ret = tegra_spi_init_dma_param(tspi, false); | |
1100 | if (ret < 0) | |
1101 | goto exit_rx_dma_free; | |
1102 | tspi->max_buf_size = tspi->dma_buf_size; | |
1103 | init_completion(&tspi->tx_dma_complete); | |
1104 | init_completion(&tspi->rx_dma_complete); | |
f333a331 LD |
1105 | |
1106 | init_completion(&tspi->xfer_completion); | |
1107 | ||
1108 | pm_runtime_enable(&pdev->dev); | |
1109 | if (!pm_runtime_enabled(&pdev->dev)) { | |
1110 | ret = tegra_spi_runtime_resume(&pdev->dev); | |
1111 | if (ret) | |
1112 | goto exit_pm_disable; | |
1113 | } | |
1114 | ||
1115 | ret = pm_runtime_get_sync(&pdev->dev); | |
1116 | if (ret < 0) { | |
1117 | dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret); | |
1118 | goto exit_pm_disable; | |
1119 | } | |
1120 | tspi->def_command1_reg = SPI_M_S; | |
1121 | tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1); | |
1122 | pm_runtime_put(&pdev->dev); | |
1123 | ||
1124 | master->dev.of_node = pdev->dev.of_node; | |
5c809643 | 1125 | ret = devm_spi_register_master(&pdev->dev, master); |
f333a331 LD |
1126 | if (ret < 0) { |
1127 | dev_err(&pdev->dev, "can not register to master err %d\n", ret); | |
1128 | goto exit_pm_disable; | |
1129 | } | |
1130 | return ret; | |
1131 | ||
1132 | exit_pm_disable: | |
1133 | pm_runtime_disable(&pdev->dev); | |
1134 | if (!pm_runtime_status_suspended(&pdev->dev)) | |
1135 | tegra_spi_runtime_suspend(&pdev->dev); | |
1136 | tegra_spi_deinit_dma_param(tspi, false); | |
1137 | exit_rx_dma_free: | |
1138 | tegra_spi_deinit_dma_param(tspi, true); | |
1139 | exit_free_irq: | |
1140 | free_irq(spi_irq, tspi); | |
1141 | exit_free_master: | |
1142 | spi_master_put(master); | |
1143 | return ret; | |
1144 | } | |
1145 | ||
1146 | static int tegra_spi_remove(struct platform_device *pdev) | |
1147 | { | |
24b5a82c | 1148 | struct spi_master *master = platform_get_drvdata(pdev); |
f333a331 LD |
1149 | struct tegra_spi_data *tspi = spi_master_get_devdata(master); |
1150 | ||
1151 | free_irq(tspi->irq, tspi); | |
f333a331 LD |
1152 | |
1153 | if (tspi->tx_dma_chan) | |
1154 | tegra_spi_deinit_dma_param(tspi, false); | |
1155 | ||
1156 | if (tspi->rx_dma_chan) | |
1157 | tegra_spi_deinit_dma_param(tspi, true); | |
1158 | ||
1159 | pm_runtime_disable(&pdev->dev); | |
1160 | if (!pm_runtime_status_suspended(&pdev->dev)) | |
1161 | tegra_spi_runtime_suspend(&pdev->dev); | |
1162 | ||
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | #ifdef CONFIG_PM_SLEEP | |
1167 | static int tegra_spi_suspend(struct device *dev) | |
1168 | { | |
1169 | struct spi_master *master = dev_get_drvdata(dev); | |
1170 | ||
1171 | return spi_master_suspend(master); | |
1172 | } | |
1173 | ||
1174 | static int tegra_spi_resume(struct device *dev) | |
1175 | { | |
1176 | struct spi_master *master = dev_get_drvdata(dev); | |
1177 | struct tegra_spi_data *tspi = spi_master_get_devdata(master); | |
1178 | int ret; | |
1179 | ||
1180 | ret = pm_runtime_get_sync(dev); | |
1181 | if (ret < 0) { | |
1182 | dev_err(dev, "pm runtime failed, e = %d\n", ret); | |
1183 | return ret; | |
1184 | } | |
1185 | tegra_spi_writel(tspi, tspi->command1_reg, SPI_COMMAND1); | |
1186 | pm_runtime_put(dev); | |
1187 | ||
1188 | return spi_master_resume(master); | |
1189 | } | |
1190 | #endif | |
1191 | ||
1192 | static int tegra_spi_runtime_suspend(struct device *dev) | |
1193 | { | |
1194 | struct spi_master *master = dev_get_drvdata(dev); | |
1195 | struct tegra_spi_data *tspi = spi_master_get_devdata(master); | |
1196 | ||
1197 | /* Flush all write which are in PPSB queue by reading back */ | |
1198 | tegra_spi_readl(tspi, SPI_COMMAND1); | |
1199 | ||
1200 | clk_disable_unprepare(tspi->clk); | |
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | static int tegra_spi_runtime_resume(struct device *dev) | |
1205 | { | |
1206 | struct spi_master *master = dev_get_drvdata(dev); | |
1207 | struct tegra_spi_data *tspi = spi_master_get_devdata(master); | |
1208 | int ret; | |
1209 | ||
1210 | ret = clk_prepare_enable(tspi->clk); | |
1211 | if (ret < 0) { | |
1212 | dev_err(tspi->dev, "clk_prepare failed: %d\n", ret); | |
1213 | return ret; | |
1214 | } | |
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | static const struct dev_pm_ops tegra_spi_pm_ops = { | |
1219 | SET_RUNTIME_PM_OPS(tegra_spi_runtime_suspend, | |
1220 | tegra_spi_runtime_resume, NULL) | |
1221 | SET_SYSTEM_SLEEP_PM_OPS(tegra_spi_suspend, tegra_spi_resume) | |
1222 | }; | |
1223 | static struct platform_driver tegra_spi_driver = { | |
1224 | .driver = { | |
1225 | .name = "spi-tegra114", | |
f333a331 LD |
1226 | .pm = &tegra_spi_pm_ops, |
1227 | .of_match_table = tegra_spi_of_match, | |
1228 | }, | |
1229 | .probe = tegra_spi_probe, | |
1230 | .remove = tegra_spi_remove, | |
1231 | }; | |
1232 | module_platform_driver(tegra_spi_driver); | |
1233 | ||
1234 | MODULE_ALIAS("platform:spi-tegra114"); | |
1235 | MODULE_DESCRIPTION("NVIDIA Tegra114 SPI Controller Driver"); | |
1236 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
1237 | MODULE_LICENSE("GPL v2"); |