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b5f3294f SH |
1 | /* |
2 | * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. | |
3 | * Copyright (C) 2008 Juergen Beisert | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; either version 2 | |
8 | * of the License, or (at your option) any later version. | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the | |
16 | * Free Software Foundation | |
17 | * 51 Franklin Street, Fifth Floor | |
18 | * Boston, MA 02110-1301, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/clk.h> | |
22 | #include <linux/completion.h> | |
23 | #include <linux/delay.h> | |
f62caccd RG |
24 | #include <linux/dmaengine.h> |
25 | #include <linux/dma-mapping.h> | |
b5f3294f SH |
26 | #include <linux/err.h> |
27 | #include <linux/gpio.h> | |
b5f3294f SH |
28 | #include <linux/interrupt.h> |
29 | #include <linux/io.h> | |
30 | #include <linux/irq.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/platform_device.h> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
b5f3294f SH |
35 | #include <linux/spi/spi.h> |
36 | #include <linux/spi/spi_bitbang.h> | |
37 | #include <linux/types.h> | |
22a85e4c SG |
38 | #include <linux/of.h> |
39 | #include <linux/of_device.h> | |
40 | #include <linux/of_gpio.h> | |
b5f3294f | 41 | |
f62caccd | 42 | #include <linux/platform_data/dma-imx.h> |
82906b13 | 43 | #include <linux/platform_data/spi-imx.h> |
b5f3294f SH |
44 | |
45 | #define DRIVER_NAME "spi_imx" | |
46 | ||
47 | #define MXC_CSPIRXDATA 0x00 | |
48 | #define MXC_CSPITXDATA 0x04 | |
49 | #define MXC_CSPICTRL 0x08 | |
50 | #define MXC_CSPIINT 0x0c | |
51 | #define MXC_RESET 0x1c | |
52 | ||
53 | /* generic defines to abstract from the different register layouts */ | |
54 | #define MXC_INT_RR (1 << 0) /* Receive data ready interrupt */ | |
55 | #define MXC_INT_TE (1 << 1) /* Transmit FIFO empty interrupt */ | |
56 | ||
f62caccd RG |
57 | /* The maximum bytes that a sdma BD can transfer.*/ |
58 | #define MAX_SDMA_BD_BYTES (1 << 15) | |
6cdeb002 | 59 | struct spi_imx_config { |
b5f3294f SH |
60 | unsigned int speed_hz; |
61 | unsigned int bpw; | |
62 | unsigned int mode; | |
3b2aa89e | 63 | u8 cs; |
b5f3294f SH |
64 | }; |
65 | ||
f4ba6315 | 66 | enum spi_imx_devtype { |
04ee5854 SG |
67 | IMX1_CSPI, |
68 | IMX21_CSPI, | |
69 | IMX27_CSPI, | |
70 | IMX31_CSPI, | |
71 | IMX35_CSPI, /* CSPI on all i.mx except above */ | |
72 | IMX51_ECSPI, /* ECSPI on i.mx51 and later */ | |
f4ba6315 UKK |
73 | }; |
74 | ||
75 | struct spi_imx_data; | |
76 | ||
77 | struct spi_imx_devtype_data { | |
78 | void (*intctrl)(struct spi_imx_data *, int); | |
79 | int (*config)(struct spi_imx_data *, struct spi_imx_config *); | |
80 | void (*trigger)(struct spi_imx_data *); | |
81 | int (*rx_available)(struct spi_imx_data *); | |
1723e66b | 82 | void (*reset)(struct spi_imx_data *); |
04ee5854 | 83 | enum spi_imx_devtype devtype; |
f4ba6315 UKK |
84 | }; |
85 | ||
6cdeb002 | 86 | struct spi_imx_data { |
b5f3294f | 87 | struct spi_bitbang bitbang; |
6aa800ca | 88 | struct device *dev; |
b5f3294f SH |
89 | |
90 | struct completion xfer_done; | |
cc4d22ae | 91 | void __iomem *base; |
f12ae171 AB |
92 | unsigned long base_phys; |
93 | ||
aa29d840 SH |
94 | struct clk *clk_per; |
95 | struct clk *clk_ipg; | |
b5f3294f | 96 | unsigned long spi_clk; |
4bfe927a | 97 | unsigned int spi_bus_clk; |
b5f3294f | 98 | |
f12ae171 AB |
99 | unsigned int bytes_per_word; |
100 | ||
b5f3294f | 101 | unsigned int count; |
6cdeb002 UKK |
102 | void (*tx)(struct spi_imx_data *); |
103 | void (*rx)(struct spi_imx_data *); | |
b5f3294f SH |
104 | void *rx_buf; |
105 | const void *tx_buf; | |
106 | unsigned int txfifo; /* number of words pushed in tx FIFO */ | |
107 | ||
f62caccd | 108 | /* DMA */ |
f62caccd | 109 | bool usedma; |
0dfbaa89 | 110 | u32 wml; |
f62caccd RG |
111 | struct completion dma_rx_completion; |
112 | struct completion dma_tx_completion; | |
113 | ||
80023cb3 | 114 | const struct spi_imx_devtype_data *devtype_data; |
c2387cb9 | 115 | int chipselect[0]; |
b5f3294f SH |
116 | }; |
117 | ||
04ee5854 SG |
118 | static inline int is_imx27_cspi(struct spi_imx_data *d) |
119 | { | |
120 | return d->devtype_data->devtype == IMX27_CSPI; | |
121 | } | |
122 | ||
123 | static inline int is_imx35_cspi(struct spi_imx_data *d) | |
124 | { | |
125 | return d->devtype_data->devtype == IMX35_CSPI; | |
126 | } | |
127 | ||
f8a87617 AB |
128 | static inline int is_imx51_ecspi(struct spi_imx_data *d) |
129 | { | |
130 | return d->devtype_data->devtype == IMX51_ECSPI; | |
131 | } | |
132 | ||
04ee5854 SG |
133 | static inline unsigned spi_imx_get_fifosize(struct spi_imx_data *d) |
134 | { | |
f8a87617 | 135 | return is_imx51_ecspi(d) ? 64 : 8; |
04ee5854 SG |
136 | } |
137 | ||
b5f3294f | 138 | #define MXC_SPI_BUF_RX(type) \ |
6cdeb002 | 139 | static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx) \ |
b5f3294f | 140 | { \ |
6cdeb002 | 141 | unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); \ |
b5f3294f | 142 | \ |
6cdeb002 UKK |
143 | if (spi_imx->rx_buf) { \ |
144 | *(type *)spi_imx->rx_buf = val; \ | |
145 | spi_imx->rx_buf += sizeof(type); \ | |
b5f3294f SH |
146 | } \ |
147 | } | |
148 | ||
149 | #define MXC_SPI_BUF_TX(type) \ | |
6cdeb002 | 150 | static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx) \ |
b5f3294f SH |
151 | { \ |
152 | type val = 0; \ | |
153 | \ | |
6cdeb002 UKK |
154 | if (spi_imx->tx_buf) { \ |
155 | val = *(type *)spi_imx->tx_buf; \ | |
156 | spi_imx->tx_buf += sizeof(type); \ | |
b5f3294f SH |
157 | } \ |
158 | \ | |
6cdeb002 | 159 | spi_imx->count -= sizeof(type); \ |
b5f3294f | 160 | \ |
6cdeb002 | 161 | writel(val, spi_imx->base + MXC_CSPITXDATA); \ |
b5f3294f SH |
162 | } |
163 | ||
164 | MXC_SPI_BUF_RX(u8) | |
165 | MXC_SPI_BUF_TX(u8) | |
166 | MXC_SPI_BUF_RX(u16) | |
167 | MXC_SPI_BUF_TX(u16) | |
168 | MXC_SPI_BUF_RX(u32) | |
169 | MXC_SPI_BUF_TX(u32) | |
170 | ||
171 | /* First entry is reserved, second entry is valid only if SDHC_SPIEN is set | |
172 | * (which is currently not the case in this driver) | |
173 | */ | |
174 | static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, | |
175 | 256, 384, 512, 768, 1024}; | |
176 | ||
177 | /* MX21, MX27 */ | |
6cdeb002 | 178 | static unsigned int spi_imx_clkdiv_1(unsigned int fin, |
04ee5854 | 179 | unsigned int fspi, unsigned int max) |
b5f3294f | 180 | { |
04ee5854 | 181 | int i; |
b5f3294f SH |
182 | |
183 | for (i = 2; i < max; i++) | |
184 | if (fspi * mxc_clkdivs[i] >= fin) | |
185 | return i; | |
186 | ||
187 | return max; | |
188 | } | |
189 | ||
0b599603 | 190 | /* MX1, MX31, MX35, MX51 CSPI */ |
6cdeb002 | 191 | static unsigned int spi_imx_clkdiv_2(unsigned int fin, |
b5f3294f SH |
192 | unsigned int fspi) |
193 | { | |
194 | int i, div = 4; | |
195 | ||
196 | for (i = 0; i < 7; i++) { | |
197 | if (fspi * div >= fin) | |
198 | return i; | |
199 | div <<= 1; | |
200 | } | |
201 | ||
202 | return 7; | |
203 | } | |
204 | ||
f12ae171 AB |
205 | static int spi_imx_bytes_per_word(const int bpw) |
206 | { | |
207 | return DIV_ROUND_UP(bpw, BITS_PER_BYTE); | |
208 | } | |
209 | ||
f62caccd RG |
210 | static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, |
211 | struct spi_transfer *transfer) | |
212 | { | |
213 | struct spi_imx_data *spi_imx = spi_master_get_devdata(master); | |
cd8dd41a | 214 | unsigned int bpw; |
f12ae171 AB |
215 | |
216 | if (!master->dma_rx) | |
217 | return false; | |
218 | ||
cd8dd41a SH |
219 | if (!transfer) |
220 | return false; | |
221 | ||
222 | bpw = transfer->bits_per_word; | |
f12ae171 AB |
223 | if (!bpw) |
224 | bpw = spi->bits_per_word; | |
225 | ||
226 | bpw = spi_imx_bytes_per_word(bpw); | |
227 | ||
228 | if (bpw != 1 && bpw != 2 && bpw != 4) | |
229 | return false; | |
230 | ||
231 | if (transfer->len < spi_imx->wml * bpw) | |
232 | return false; | |
233 | ||
234 | if (transfer->len % (spi_imx->wml * bpw)) | |
235 | return false; | |
f62caccd | 236 | |
f12ae171 | 237 | return true; |
f62caccd RG |
238 | } |
239 | ||
66de757c SG |
240 | #define MX51_ECSPI_CTRL 0x08 |
241 | #define MX51_ECSPI_CTRL_ENABLE (1 << 0) | |
242 | #define MX51_ECSPI_CTRL_XCH (1 << 2) | |
f62caccd | 243 | #define MX51_ECSPI_CTRL_SMC (1 << 3) |
66de757c SG |
244 | #define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4) |
245 | #define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8 | |
246 | #define MX51_ECSPI_CTRL_PREDIV_OFFSET 12 | |
247 | #define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18) | |
248 | #define MX51_ECSPI_CTRL_BL_OFFSET 20 | |
249 | ||
250 | #define MX51_ECSPI_CONFIG 0x0c | |
251 | #define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0)) | |
252 | #define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs) + 4)) | |
253 | #define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs) + 8)) | |
254 | #define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs) + 12)) | |
c09b890b | 255 | #define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs) + 20)) |
66de757c SG |
256 | |
257 | #define MX51_ECSPI_INT 0x10 | |
258 | #define MX51_ECSPI_INT_TEEN (1 << 0) | |
259 | #define MX51_ECSPI_INT_RREN (1 << 3) | |
260 | ||
f62caccd | 261 | #define MX51_ECSPI_DMA 0x14 |
d629c2a0 SH |
262 | #define MX51_ECSPI_DMA_TX_WML(wml) ((wml) & 0x3f) |
263 | #define MX51_ECSPI_DMA_RX_WML(wml) (((wml) & 0x3f) << 16) | |
264 | #define MX51_ECSPI_DMA_RXT_WML(wml) (((wml) & 0x3f) << 24) | |
f62caccd | 265 | |
2b0fd069 SH |
266 | #define MX51_ECSPI_DMA_TEDEN (1 << 7) |
267 | #define MX51_ECSPI_DMA_RXDEN (1 << 23) | |
268 | #define MX51_ECSPI_DMA_RXTDEN (1 << 31) | |
f62caccd | 269 | |
66de757c SG |
270 | #define MX51_ECSPI_STAT 0x18 |
271 | #define MX51_ECSPI_STAT_RR (1 << 3) | |
0b599603 | 272 | |
9f6aa42b FE |
273 | #define MX51_ECSPI_TESTREG 0x20 |
274 | #define MX51_ECSPI_TESTREG_LBC BIT(31) | |
275 | ||
0b599603 | 276 | /* MX51 eCSPI */ |
6aa800ca SH |
277 | static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx, |
278 | unsigned int fspi, unsigned int *fres) | |
0b599603 UKK |
279 | { |
280 | /* | |
281 | * there are two 4-bit dividers, the pre-divider divides by | |
282 | * $pre, the post-divider by 2^$post | |
283 | */ | |
284 | unsigned int pre, post; | |
6aa800ca | 285 | unsigned int fin = spi_imx->spi_clk; |
0b599603 UKK |
286 | |
287 | if (unlikely(fspi > fin)) | |
288 | return 0; | |
289 | ||
290 | post = fls(fin) - fls(fspi); | |
291 | if (fin > fspi << post) | |
292 | post++; | |
293 | ||
294 | /* now we have: (fin <= fspi << post) with post being minimal */ | |
295 | ||
296 | post = max(4U, post) - 4; | |
297 | if (unlikely(post > 0xf)) { | |
6aa800ca SH |
298 | dev_err(spi_imx->dev, "cannot set clock freq: %u (base freq: %u)\n", |
299 | fspi, fin); | |
0b599603 UKK |
300 | return 0xff; |
301 | } | |
302 | ||
303 | pre = DIV_ROUND_UP(fin, fspi << post) - 1; | |
304 | ||
6aa800ca | 305 | dev_dbg(spi_imx->dev, "%s: fin: %u, fspi: %u, post: %u, pre: %u\n", |
0b599603 | 306 | __func__, fin, fspi, post, pre); |
6fd8b850 MV |
307 | |
308 | /* Resulting frequency for the SCLK line. */ | |
309 | *fres = (fin / (pre + 1)) >> post; | |
310 | ||
66de757c SG |
311 | return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) | |
312 | (post << MX51_ECSPI_CTRL_POSTDIV_OFFSET); | |
0b599603 UKK |
313 | } |
314 | ||
66de757c | 315 | static void __maybe_unused mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable) |
0b599603 UKK |
316 | { |
317 | unsigned val = 0; | |
318 | ||
319 | if (enable & MXC_INT_TE) | |
66de757c | 320 | val |= MX51_ECSPI_INT_TEEN; |
0b599603 UKK |
321 | |
322 | if (enable & MXC_INT_RR) | |
66de757c | 323 | val |= MX51_ECSPI_INT_RREN; |
0b599603 | 324 | |
66de757c | 325 | writel(val, spi_imx->base + MX51_ECSPI_INT); |
0b599603 UKK |
326 | } |
327 | ||
66de757c | 328 | static void __maybe_unused mx51_ecspi_trigger(struct spi_imx_data *spi_imx) |
0b599603 | 329 | { |
b03c3884 | 330 | u32 reg; |
f62caccd | 331 | |
b03c3884 SH |
332 | reg = readl(spi_imx->base + MX51_ECSPI_CTRL); |
333 | reg |= MX51_ECSPI_CTRL_XCH; | |
66de757c | 334 | writel(reg, spi_imx->base + MX51_ECSPI_CTRL); |
0b599603 UKK |
335 | } |
336 | ||
66de757c | 337 | static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, |
0b599603 UKK |
338 | struct spi_imx_config *config) |
339 | { | |
793c7f92 | 340 | u32 ctrl = MX51_ECSPI_CTRL_ENABLE; |
9f6aa42b | 341 | u32 clk = config->speed_hz, delay, reg; |
793c7f92 | 342 | u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG); |
0b599603 | 343 | |
f020c39e SH |
344 | /* |
345 | * The hardware seems to have a race condition when changing modes. The | |
346 | * current assumption is that the selection of the channel arrives | |
347 | * earlier in the hardware than the mode bits when they are written at | |
348 | * the same time. | |
349 | * So set master mode for all channels as we do not support slave mode. | |
350 | */ | |
66de757c | 351 | ctrl |= MX51_ECSPI_CTRL_MODE_MASK; |
0b599603 UKK |
352 | |
353 | /* set clock speed */ | |
6aa800ca | 354 | ctrl |= mx51_ecspi_clkdiv(spi_imx, config->speed_hz, &clk); |
4bfe927a | 355 | spi_imx->spi_bus_clk = clk; |
0b599603 UKK |
356 | |
357 | /* set chip select to use */ | |
66de757c | 358 | ctrl |= MX51_ECSPI_CTRL_CS(config->cs); |
0b599603 | 359 | |
66de757c | 360 | ctrl |= (config->bpw - 1) << MX51_ECSPI_CTRL_BL_OFFSET; |
0b599603 | 361 | |
66de757c | 362 | cfg |= MX51_ECSPI_CONFIG_SBBCTRL(config->cs); |
0b599603 UKK |
363 | |
364 | if (config->mode & SPI_CPHA) | |
66de757c | 365 | cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs); |
793c7f92 KW |
366 | else |
367 | cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(config->cs); | |
0b599603 | 368 | |
c09b890b | 369 | if (config->mode & SPI_CPOL) { |
66de757c | 370 | cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs); |
c09b890b | 371 | cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs); |
793c7f92 KW |
372 | } else { |
373 | cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(config->cs); | |
374 | cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(config->cs); | |
c09b890b | 375 | } |
0b599603 | 376 | if (config->mode & SPI_CS_HIGH) |
66de757c | 377 | cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs); |
793c7f92 KW |
378 | else |
379 | cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(config->cs); | |
0b599603 | 380 | |
b03c3884 SH |
381 | if (spi_imx->usedma) |
382 | ctrl |= MX51_ECSPI_CTRL_SMC; | |
383 | ||
f677f17c AB |
384 | /* CTRL register always go first to bring out controller from reset */ |
385 | writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); | |
386 | ||
9f6aa42b FE |
387 | reg = readl(spi_imx->base + MX51_ECSPI_TESTREG); |
388 | if (config->mode & SPI_LOOP) | |
389 | reg |= MX51_ECSPI_TESTREG_LBC; | |
390 | else | |
391 | reg &= ~MX51_ECSPI_TESTREG_LBC; | |
392 | writel(reg, spi_imx->base + MX51_ECSPI_TESTREG); | |
393 | ||
66de757c | 394 | writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG); |
0b599603 | 395 | |
6fd8b850 MV |
396 | /* |
397 | * Wait until the changes in the configuration register CONFIGREG | |
398 | * propagate into the hardware. It takes exactly one tick of the | |
399 | * SCLK clock, but we will wait two SCLK clock just to be sure. The | |
400 | * effect of the delay it takes for the hardware to apply changes | |
401 | * is noticable if the SCLK clock run very slow. In such a case, if | |
402 | * the polarity of SCLK should be inverted, the GPIO ChipSelect might | |
403 | * be asserted before the SCLK polarity changes, which would disrupt | |
404 | * the SPI communication as the device on the other end would consider | |
405 | * the change of SCLK polarity as a clock tick already. | |
406 | */ | |
407 | delay = (2 * 1000000) / clk; | |
408 | if (likely(delay < 10)) /* SCLK is faster than 100 kHz */ | |
409 | udelay(delay); | |
410 | else /* SCLK is _very_ slow */ | |
411 | usleep_range(delay, delay + 10); | |
412 | ||
f62caccd RG |
413 | /* |
414 | * Configure the DMA register: setup the watermark | |
415 | * and enable DMA request. | |
416 | */ | |
2b0fd069 | 417 | |
d629c2a0 SH |
418 | writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml) | |
419 | MX51_ECSPI_DMA_TX_WML(spi_imx->wml) | | |
420 | MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) | | |
2b0fd069 SH |
421 | MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN | |
422 | MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA); | |
f62caccd | 423 | |
0b599603 UKK |
424 | return 0; |
425 | } | |
426 | ||
66de757c | 427 | static int __maybe_unused mx51_ecspi_rx_available(struct spi_imx_data *spi_imx) |
0b599603 | 428 | { |
66de757c | 429 | return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR; |
0b599603 UKK |
430 | } |
431 | ||
66de757c | 432 | static void __maybe_unused mx51_ecspi_reset(struct spi_imx_data *spi_imx) |
0b599603 UKK |
433 | { |
434 | /* drain receive buffer */ | |
66de757c | 435 | while (mx51_ecspi_rx_available(spi_imx)) |
0b599603 UKK |
436 | readl(spi_imx->base + MXC_CSPIRXDATA); |
437 | } | |
438 | ||
b5f3294f SH |
439 | #define MX31_INTREG_TEEN (1 << 0) |
440 | #define MX31_INTREG_RREN (1 << 3) | |
441 | ||
442 | #define MX31_CSPICTRL_ENABLE (1 << 0) | |
443 | #define MX31_CSPICTRL_MASTER (1 << 1) | |
444 | #define MX31_CSPICTRL_XCH (1 << 2) | |
445 | #define MX31_CSPICTRL_POL (1 << 4) | |
446 | #define MX31_CSPICTRL_PHA (1 << 5) | |
447 | #define MX31_CSPICTRL_SSCTL (1 << 6) | |
448 | #define MX31_CSPICTRL_SSPOL (1 << 7) | |
449 | #define MX31_CSPICTRL_BC_SHIFT 8 | |
450 | #define MX35_CSPICTRL_BL_SHIFT 20 | |
451 | #define MX31_CSPICTRL_CS_SHIFT 24 | |
452 | #define MX35_CSPICTRL_CS_SHIFT 12 | |
453 | #define MX31_CSPICTRL_DR_SHIFT 16 | |
454 | ||
455 | #define MX31_CSPISTATUS 0x14 | |
456 | #define MX31_STATUS_RR (1 << 3) | |
457 | ||
458 | /* These functions also work for the i.MX35, but be aware that | |
459 | * the i.MX35 has a slightly different register layout for bits | |
460 | * we do not use here. | |
461 | */ | |
f4ba6315 | 462 | static void __maybe_unused mx31_intctrl(struct spi_imx_data *spi_imx, int enable) |
b5f3294f SH |
463 | { |
464 | unsigned int val = 0; | |
465 | ||
466 | if (enable & MXC_INT_TE) | |
467 | val |= MX31_INTREG_TEEN; | |
468 | if (enable & MXC_INT_RR) | |
469 | val |= MX31_INTREG_RREN; | |
470 | ||
6cdeb002 | 471 | writel(val, spi_imx->base + MXC_CSPIINT); |
b5f3294f SH |
472 | } |
473 | ||
f4ba6315 | 474 | static void __maybe_unused mx31_trigger(struct spi_imx_data *spi_imx) |
b5f3294f SH |
475 | { |
476 | unsigned int reg; | |
477 | ||
6cdeb002 | 478 | reg = readl(spi_imx->base + MXC_CSPICTRL); |
b5f3294f | 479 | reg |= MX31_CSPICTRL_XCH; |
6cdeb002 | 480 | writel(reg, spi_imx->base + MXC_CSPICTRL); |
b5f3294f SH |
481 | } |
482 | ||
2a64a90a | 483 | static int __maybe_unused mx31_config(struct spi_imx_data *spi_imx, |
1723e66b UKK |
484 | struct spi_imx_config *config) |
485 | { | |
486 | unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER; | |
3b2aa89e | 487 | int cs = spi_imx->chipselect[config->cs]; |
1723e66b UKK |
488 | |
489 | reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) << | |
490 | MX31_CSPICTRL_DR_SHIFT; | |
491 | ||
04ee5854 | 492 | if (is_imx35_cspi(spi_imx)) { |
2a64a90a SG |
493 | reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT; |
494 | reg |= MX31_CSPICTRL_SSCTL; | |
495 | } else { | |
496 | reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT; | |
497 | } | |
1723e66b UKK |
498 | |
499 | if (config->mode & SPI_CPHA) | |
500 | reg |= MX31_CSPICTRL_PHA; | |
501 | if (config->mode & SPI_CPOL) | |
502 | reg |= MX31_CSPICTRL_POL; | |
503 | if (config->mode & SPI_CS_HIGH) | |
504 | reg |= MX31_CSPICTRL_SSPOL; | |
3b2aa89e | 505 | if (cs < 0) |
2a64a90a | 506 | reg |= (cs + 32) << |
04ee5854 SG |
507 | (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT : |
508 | MX31_CSPICTRL_CS_SHIFT); | |
1723e66b UKK |
509 | |
510 | writel(reg, spi_imx->base + MXC_CSPICTRL); | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
f4ba6315 | 515 | static int __maybe_unused mx31_rx_available(struct spi_imx_data *spi_imx) |
b5f3294f | 516 | { |
6cdeb002 | 517 | return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR; |
b5f3294f SH |
518 | } |
519 | ||
2a64a90a | 520 | static void __maybe_unused mx31_reset(struct spi_imx_data *spi_imx) |
1723e66b UKK |
521 | { |
522 | /* drain receive buffer */ | |
2a64a90a | 523 | while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR) |
1723e66b UKK |
524 | readl(spi_imx->base + MXC_CSPIRXDATA); |
525 | } | |
526 | ||
3451fb15 SG |
527 | #define MX21_INTREG_RR (1 << 4) |
528 | #define MX21_INTREG_TEEN (1 << 9) | |
529 | #define MX21_INTREG_RREN (1 << 13) | |
530 | ||
531 | #define MX21_CSPICTRL_POL (1 << 5) | |
532 | #define MX21_CSPICTRL_PHA (1 << 6) | |
533 | #define MX21_CSPICTRL_SSPOL (1 << 8) | |
534 | #define MX21_CSPICTRL_XCH (1 << 9) | |
535 | #define MX21_CSPICTRL_ENABLE (1 << 10) | |
536 | #define MX21_CSPICTRL_MASTER (1 << 11) | |
537 | #define MX21_CSPICTRL_DR_SHIFT 14 | |
538 | #define MX21_CSPICTRL_CS_SHIFT 19 | |
539 | ||
540 | static void __maybe_unused mx21_intctrl(struct spi_imx_data *spi_imx, int enable) | |
b5f3294f SH |
541 | { |
542 | unsigned int val = 0; | |
543 | ||
544 | if (enable & MXC_INT_TE) | |
3451fb15 | 545 | val |= MX21_INTREG_TEEN; |
b5f3294f | 546 | if (enable & MXC_INT_RR) |
3451fb15 | 547 | val |= MX21_INTREG_RREN; |
b5f3294f | 548 | |
6cdeb002 | 549 | writel(val, spi_imx->base + MXC_CSPIINT); |
b5f3294f SH |
550 | } |
551 | ||
3451fb15 | 552 | static void __maybe_unused mx21_trigger(struct spi_imx_data *spi_imx) |
b5f3294f SH |
553 | { |
554 | unsigned int reg; | |
555 | ||
6cdeb002 | 556 | reg = readl(spi_imx->base + MXC_CSPICTRL); |
3451fb15 | 557 | reg |= MX21_CSPICTRL_XCH; |
6cdeb002 | 558 | writel(reg, spi_imx->base + MXC_CSPICTRL); |
b5f3294f SH |
559 | } |
560 | ||
3451fb15 | 561 | static int __maybe_unused mx21_config(struct spi_imx_data *spi_imx, |
6cdeb002 | 562 | struct spi_imx_config *config) |
b5f3294f | 563 | { |
3451fb15 | 564 | unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER; |
3b2aa89e | 565 | int cs = spi_imx->chipselect[config->cs]; |
04ee5854 | 566 | unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18; |
b5f3294f | 567 | |
04ee5854 | 568 | reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max) << |
3451fb15 | 569 | MX21_CSPICTRL_DR_SHIFT; |
b5f3294f SH |
570 | reg |= config->bpw - 1; |
571 | ||
572 | if (config->mode & SPI_CPHA) | |
3451fb15 | 573 | reg |= MX21_CSPICTRL_PHA; |
b5f3294f | 574 | if (config->mode & SPI_CPOL) |
3451fb15 | 575 | reg |= MX21_CSPICTRL_POL; |
b5f3294f | 576 | if (config->mode & SPI_CS_HIGH) |
3451fb15 | 577 | reg |= MX21_CSPICTRL_SSPOL; |
3b2aa89e | 578 | if (cs < 0) |
3451fb15 | 579 | reg |= (cs + 32) << MX21_CSPICTRL_CS_SHIFT; |
b5f3294f | 580 | |
6cdeb002 | 581 | writel(reg, spi_imx->base + MXC_CSPICTRL); |
b5f3294f SH |
582 | |
583 | return 0; | |
584 | } | |
585 | ||
3451fb15 | 586 | static int __maybe_unused mx21_rx_available(struct spi_imx_data *spi_imx) |
b5f3294f | 587 | { |
3451fb15 | 588 | return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR; |
b5f3294f SH |
589 | } |
590 | ||
3451fb15 | 591 | static void __maybe_unused mx21_reset(struct spi_imx_data *spi_imx) |
1723e66b UKK |
592 | { |
593 | writel(1, spi_imx->base + MXC_RESET); | |
594 | } | |
595 | ||
b5f3294f SH |
596 | #define MX1_INTREG_RR (1 << 3) |
597 | #define MX1_INTREG_TEEN (1 << 8) | |
598 | #define MX1_INTREG_RREN (1 << 11) | |
599 | ||
600 | #define MX1_CSPICTRL_POL (1 << 4) | |
601 | #define MX1_CSPICTRL_PHA (1 << 5) | |
602 | #define MX1_CSPICTRL_XCH (1 << 8) | |
603 | #define MX1_CSPICTRL_ENABLE (1 << 9) | |
604 | #define MX1_CSPICTRL_MASTER (1 << 10) | |
605 | #define MX1_CSPICTRL_DR_SHIFT 13 | |
606 | ||
f4ba6315 | 607 | static void __maybe_unused mx1_intctrl(struct spi_imx_data *spi_imx, int enable) |
b5f3294f SH |
608 | { |
609 | unsigned int val = 0; | |
610 | ||
611 | if (enable & MXC_INT_TE) | |
612 | val |= MX1_INTREG_TEEN; | |
613 | if (enable & MXC_INT_RR) | |
614 | val |= MX1_INTREG_RREN; | |
615 | ||
6cdeb002 | 616 | writel(val, spi_imx->base + MXC_CSPIINT); |
b5f3294f SH |
617 | } |
618 | ||
f4ba6315 | 619 | static void __maybe_unused mx1_trigger(struct spi_imx_data *spi_imx) |
b5f3294f SH |
620 | { |
621 | unsigned int reg; | |
622 | ||
6cdeb002 | 623 | reg = readl(spi_imx->base + MXC_CSPICTRL); |
b5f3294f | 624 | reg |= MX1_CSPICTRL_XCH; |
6cdeb002 | 625 | writel(reg, spi_imx->base + MXC_CSPICTRL); |
b5f3294f SH |
626 | } |
627 | ||
f4ba6315 | 628 | static int __maybe_unused mx1_config(struct spi_imx_data *spi_imx, |
6cdeb002 | 629 | struct spi_imx_config *config) |
b5f3294f SH |
630 | { |
631 | unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER; | |
632 | ||
6cdeb002 | 633 | reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) << |
b5f3294f SH |
634 | MX1_CSPICTRL_DR_SHIFT; |
635 | reg |= config->bpw - 1; | |
636 | ||
637 | if (config->mode & SPI_CPHA) | |
638 | reg |= MX1_CSPICTRL_PHA; | |
639 | if (config->mode & SPI_CPOL) | |
640 | reg |= MX1_CSPICTRL_POL; | |
641 | ||
6cdeb002 | 642 | writel(reg, spi_imx->base + MXC_CSPICTRL); |
b5f3294f SH |
643 | |
644 | return 0; | |
645 | } | |
646 | ||
f4ba6315 | 647 | static int __maybe_unused mx1_rx_available(struct spi_imx_data *spi_imx) |
b5f3294f | 648 | { |
6cdeb002 | 649 | return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR; |
b5f3294f SH |
650 | } |
651 | ||
1723e66b UKK |
652 | static void __maybe_unused mx1_reset(struct spi_imx_data *spi_imx) |
653 | { | |
654 | writel(1, spi_imx->base + MXC_RESET); | |
655 | } | |
656 | ||
04ee5854 SG |
657 | static struct spi_imx_devtype_data imx1_cspi_devtype_data = { |
658 | .intctrl = mx1_intctrl, | |
659 | .config = mx1_config, | |
660 | .trigger = mx1_trigger, | |
661 | .rx_available = mx1_rx_available, | |
662 | .reset = mx1_reset, | |
663 | .devtype = IMX1_CSPI, | |
664 | }; | |
665 | ||
666 | static struct spi_imx_devtype_data imx21_cspi_devtype_data = { | |
667 | .intctrl = mx21_intctrl, | |
668 | .config = mx21_config, | |
669 | .trigger = mx21_trigger, | |
670 | .rx_available = mx21_rx_available, | |
671 | .reset = mx21_reset, | |
672 | .devtype = IMX21_CSPI, | |
673 | }; | |
674 | ||
675 | static struct spi_imx_devtype_data imx27_cspi_devtype_data = { | |
676 | /* i.mx27 cspi shares the functions with i.mx21 one */ | |
677 | .intctrl = mx21_intctrl, | |
678 | .config = mx21_config, | |
679 | .trigger = mx21_trigger, | |
680 | .rx_available = mx21_rx_available, | |
681 | .reset = mx21_reset, | |
682 | .devtype = IMX27_CSPI, | |
683 | }; | |
684 | ||
685 | static struct spi_imx_devtype_data imx31_cspi_devtype_data = { | |
686 | .intctrl = mx31_intctrl, | |
687 | .config = mx31_config, | |
688 | .trigger = mx31_trigger, | |
689 | .rx_available = mx31_rx_available, | |
690 | .reset = mx31_reset, | |
691 | .devtype = IMX31_CSPI, | |
692 | }; | |
693 | ||
694 | static struct spi_imx_devtype_data imx35_cspi_devtype_data = { | |
695 | /* i.mx35 and later cspi shares the functions with i.mx31 one */ | |
696 | .intctrl = mx31_intctrl, | |
697 | .config = mx31_config, | |
698 | .trigger = mx31_trigger, | |
699 | .rx_available = mx31_rx_available, | |
700 | .reset = mx31_reset, | |
701 | .devtype = IMX35_CSPI, | |
702 | }; | |
703 | ||
704 | static struct spi_imx_devtype_data imx51_ecspi_devtype_data = { | |
705 | .intctrl = mx51_ecspi_intctrl, | |
706 | .config = mx51_ecspi_config, | |
707 | .trigger = mx51_ecspi_trigger, | |
708 | .rx_available = mx51_ecspi_rx_available, | |
709 | .reset = mx51_ecspi_reset, | |
710 | .devtype = IMX51_ECSPI, | |
711 | }; | |
712 | ||
db1b8200 | 713 | static const struct platform_device_id spi_imx_devtype[] = { |
04ee5854 SG |
714 | { |
715 | .name = "imx1-cspi", | |
716 | .driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data, | |
717 | }, { | |
718 | .name = "imx21-cspi", | |
719 | .driver_data = (kernel_ulong_t) &imx21_cspi_devtype_data, | |
720 | }, { | |
721 | .name = "imx27-cspi", | |
722 | .driver_data = (kernel_ulong_t) &imx27_cspi_devtype_data, | |
723 | }, { | |
724 | .name = "imx31-cspi", | |
725 | .driver_data = (kernel_ulong_t) &imx31_cspi_devtype_data, | |
726 | }, { | |
727 | .name = "imx35-cspi", | |
728 | .driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data, | |
729 | }, { | |
730 | .name = "imx51-ecspi", | |
731 | .driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data, | |
732 | }, { | |
733 | /* sentinel */ | |
734 | } | |
f4ba6315 UKK |
735 | }; |
736 | ||
22a85e4c SG |
737 | static const struct of_device_id spi_imx_dt_ids[] = { |
738 | { .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, }, | |
739 | { .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, }, | |
740 | { .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, }, | |
741 | { .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, }, | |
742 | { .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, }, | |
743 | { .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, }, | |
744 | { /* sentinel */ } | |
745 | }; | |
27743e0b | 746 | MODULE_DEVICE_TABLE(of, spi_imx_dt_ids); |
22a85e4c | 747 | |
6cdeb002 | 748 | static void spi_imx_chipselect(struct spi_device *spi, int is_active) |
b5f3294f | 749 | { |
6cdeb002 | 750 | struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); |
6cdeb002 | 751 | int gpio = spi_imx->chipselect[spi->chip_select]; |
e6a0a8bf UKK |
752 | int active = is_active != BITBANG_CS_INACTIVE; |
753 | int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH); | |
b5f3294f | 754 | |
8b17e055 | 755 | if (!gpio_is_valid(gpio)) |
b5f3294f | 756 | return; |
b5f3294f | 757 | |
e6a0a8bf | 758 | gpio_set_value(gpio, dev_is_lowactive ^ active); |
b5f3294f SH |
759 | } |
760 | ||
6cdeb002 | 761 | static void spi_imx_push(struct spi_imx_data *spi_imx) |
b5f3294f | 762 | { |
04ee5854 | 763 | while (spi_imx->txfifo < spi_imx_get_fifosize(spi_imx)) { |
6cdeb002 | 764 | if (!spi_imx->count) |
b5f3294f | 765 | break; |
6cdeb002 UKK |
766 | spi_imx->tx(spi_imx); |
767 | spi_imx->txfifo++; | |
b5f3294f SH |
768 | } |
769 | ||
edd501bb | 770 | spi_imx->devtype_data->trigger(spi_imx); |
b5f3294f SH |
771 | } |
772 | ||
6cdeb002 | 773 | static irqreturn_t spi_imx_isr(int irq, void *dev_id) |
b5f3294f | 774 | { |
6cdeb002 | 775 | struct spi_imx_data *spi_imx = dev_id; |
b5f3294f | 776 | |
edd501bb | 777 | while (spi_imx->devtype_data->rx_available(spi_imx)) { |
6cdeb002 UKK |
778 | spi_imx->rx(spi_imx); |
779 | spi_imx->txfifo--; | |
b5f3294f SH |
780 | } |
781 | ||
6cdeb002 UKK |
782 | if (spi_imx->count) { |
783 | spi_imx_push(spi_imx); | |
b5f3294f SH |
784 | return IRQ_HANDLED; |
785 | } | |
786 | ||
6cdeb002 | 787 | if (spi_imx->txfifo) { |
b5f3294f SH |
788 | /* No data left to push, but still waiting for rx data, |
789 | * enable receive data available interrupt. | |
790 | */ | |
edd501bb | 791 | spi_imx->devtype_data->intctrl( |
f4ba6315 | 792 | spi_imx, MXC_INT_RR); |
b5f3294f SH |
793 | return IRQ_HANDLED; |
794 | } | |
795 | ||
edd501bb | 796 | spi_imx->devtype_data->intctrl(spi_imx, 0); |
6cdeb002 | 797 | complete(&spi_imx->xfer_done); |
b5f3294f SH |
798 | |
799 | return IRQ_HANDLED; | |
800 | } | |
801 | ||
f12ae171 AB |
802 | static int spi_imx_dma_configure(struct spi_master *master, |
803 | int bytes_per_word) | |
804 | { | |
805 | int ret; | |
806 | enum dma_slave_buswidth buswidth; | |
807 | struct dma_slave_config rx = {}, tx = {}; | |
808 | struct spi_imx_data *spi_imx = spi_master_get_devdata(master); | |
809 | ||
810 | if (bytes_per_word == spi_imx->bytes_per_word) | |
811 | /* Same as last time */ | |
812 | return 0; | |
813 | ||
814 | switch (bytes_per_word) { | |
815 | case 4: | |
816 | buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
817 | break; | |
818 | case 2: | |
819 | buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; | |
820 | break; | |
821 | case 1: | |
822 | buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
823 | break; | |
824 | default: | |
825 | return -EINVAL; | |
826 | } | |
827 | ||
828 | tx.direction = DMA_MEM_TO_DEV; | |
829 | tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA; | |
830 | tx.dst_addr_width = buswidth; | |
831 | tx.dst_maxburst = spi_imx->wml; | |
832 | ret = dmaengine_slave_config(master->dma_tx, &tx); | |
833 | if (ret) { | |
834 | dev_err(spi_imx->dev, "TX dma configuration failed with %d\n", ret); | |
835 | return ret; | |
836 | } | |
837 | ||
838 | rx.direction = DMA_DEV_TO_MEM; | |
839 | rx.src_addr = spi_imx->base_phys + MXC_CSPIRXDATA; | |
840 | rx.src_addr_width = buswidth; | |
841 | rx.src_maxburst = spi_imx->wml; | |
842 | ret = dmaengine_slave_config(master->dma_rx, &rx); | |
843 | if (ret) { | |
844 | dev_err(spi_imx->dev, "RX dma configuration failed with %d\n", ret); | |
845 | return ret; | |
846 | } | |
847 | ||
848 | spi_imx->bytes_per_word = bytes_per_word; | |
849 | ||
850 | return 0; | |
851 | } | |
852 | ||
6cdeb002 | 853 | static int spi_imx_setupxfer(struct spi_device *spi, |
b5f3294f SH |
854 | struct spi_transfer *t) |
855 | { | |
6cdeb002 UKK |
856 | struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); |
857 | struct spi_imx_config config; | |
f12ae171 | 858 | int ret; |
b5f3294f SH |
859 | |
860 | config.bpw = t ? t->bits_per_word : spi->bits_per_word; | |
861 | config.speed_hz = t ? t->speed_hz : spi->max_speed_hz; | |
862 | config.mode = spi->mode; | |
3b2aa89e | 863 | config.cs = spi->chip_select; |
b5f3294f | 864 | |
462d26b5 SH |
865 | if (!config.speed_hz) |
866 | config.speed_hz = spi->max_speed_hz; | |
867 | if (!config.bpw) | |
868 | config.bpw = spi->bits_per_word; | |
462d26b5 | 869 | |
e6a0a8bf UKK |
870 | /* Initialize the functions for transfer */ |
871 | if (config.bpw <= 8) { | |
872 | spi_imx->rx = spi_imx_buf_rx_u8; | |
873 | spi_imx->tx = spi_imx_buf_tx_u8; | |
874 | } else if (config.bpw <= 16) { | |
875 | spi_imx->rx = spi_imx_buf_rx_u16; | |
876 | spi_imx->tx = spi_imx_buf_tx_u16; | |
6051426f | 877 | } else { |
e6a0a8bf UKK |
878 | spi_imx->rx = spi_imx_buf_rx_u32; |
879 | spi_imx->tx = spi_imx_buf_tx_u32; | |
24778be2 | 880 | } |
e6a0a8bf | 881 | |
c008a800 SH |
882 | if (spi_imx_can_dma(spi_imx->bitbang.master, spi, t)) |
883 | spi_imx->usedma = 1; | |
884 | else | |
885 | spi_imx->usedma = 0; | |
886 | ||
f12ae171 AB |
887 | if (spi_imx->usedma) { |
888 | ret = spi_imx_dma_configure(spi->master, | |
889 | spi_imx_bytes_per_word(config.bpw)); | |
890 | if (ret) | |
891 | return ret; | |
892 | } | |
893 | ||
edd501bb | 894 | spi_imx->devtype_data->config(spi_imx, &config); |
b5f3294f SH |
895 | |
896 | return 0; | |
897 | } | |
898 | ||
f62caccd RG |
899 | static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx) |
900 | { | |
901 | struct spi_master *master = spi_imx->bitbang.master; | |
902 | ||
903 | if (master->dma_rx) { | |
904 | dma_release_channel(master->dma_rx); | |
905 | master->dma_rx = NULL; | |
906 | } | |
907 | ||
908 | if (master->dma_tx) { | |
909 | dma_release_channel(master->dma_tx); | |
910 | master->dma_tx = NULL; | |
911 | } | |
f62caccd RG |
912 | } |
913 | ||
914 | static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx, | |
f12ae171 | 915 | struct spi_master *master) |
f62caccd | 916 | { |
f62caccd RG |
917 | int ret; |
918 | ||
a02bb401 RG |
919 | /* use pio mode for i.mx6dl chip TKT238285 */ |
920 | if (of_machine_is_compatible("fsl,imx6dl")) | |
921 | return 0; | |
922 | ||
0dfbaa89 AB |
923 | spi_imx->wml = spi_imx_get_fifosize(spi_imx) / 2; |
924 | ||
f62caccd | 925 | /* Prepare for TX DMA: */ |
3760047a AB |
926 | master->dma_tx = dma_request_slave_channel_reason(dev, "tx"); |
927 | if (IS_ERR(master->dma_tx)) { | |
928 | ret = PTR_ERR(master->dma_tx); | |
929 | dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret); | |
930 | master->dma_tx = NULL; | |
f62caccd RG |
931 | goto err; |
932 | } | |
933 | ||
f62caccd | 934 | /* Prepare for RX : */ |
3760047a AB |
935 | master->dma_rx = dma_request_slave_channel_reason(dev, "rx"); |
936 | if (IS_ERR(master->dma_rx)) { | |
937 | ret = PTR_ERR(master->dma_rx); | |
938 | dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret); | |
939 | master->dma_rx = NULL; | |
f62caccd RG |
940 | goto err; |
941 | } | |
942 | ||
f12ae171 | 943 | spi_imx_dma_configure(master, 1); |
f62caccd RG |
944 | |
945 | init_completion(&spi_imx->dma_rx_completion); | |
946 | init_completion(&spi_imx->dma_tx_completion); | |
947 | master->can_dma = spi_imx_can_dma; | |
948 | master->max_dma_len = MAX_SDMA_BD_BYTES; | |
949 | spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX | | |
950 | SPI_MASTER_MUST_TX; | |
f62caccd RG |
951 | |
952 | return 0; | |
953 | err: | |
954 | spi_imx_sdma_exit(spi_imx); | |
955 | return ret; | |
956 | } | |
957 | ||
958 | static void spi_imx_dma_rx_callback(void *cookie) | |
959 | { | |
960 | struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie; | |
961 | ||
962 | complete(&spi_imx->dma_rx_completion); | |
963 | } | |
964 | ||
965 | static void spi_imx_dma_tx_callback(void *cookie) | |
966 | { | |
967 | struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie; | |
968 | ||
969 | complete(&spi_imx->dma_tx_completion); | |
970 | } | |
971 | ||
4bfe927a AB |
972 | static int spi_imx_calculate_timeout(struct spi_imx_data *spi_imx, int size) |
973 | { | |
974 | unsigned long timeout = 0; | |
975 | ||
976 | /* Time with actual data transfer and CS change delay related to HW */ | |
977 | timeout = (8 + 4) * size / spi_imx->spi_bus_clk; | |
978 | ||
979 | /* Add extra second for scheduler related activities */ | |
980 | timeout += 1; | |
981 | ||
982 | /* Double calculated timeout */ | |
983 | return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC); | |
984 | } | |
985 | ||
f62caccd RG |
986 | static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx, |
987 | struct spi_transfer *transfer) | |
988 | { | |
6b6192c0 | 989 | struct dma_async_tx_descriptor *desc_tx, *desc_rx; |
4bfe927a | 990 | unsigned long transfer_timeout; |
56536a7f | 991 | unsigned long timeout; |
f62caccd RG |
992 | struct spi_master *master = spi_imx->bitbang.master; |
993 | struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg; | |
994 | ||
6b6192c0 SH |
995 | /* |
996 | * The TX DMA setup starts the transfer, so make sure RX is configured | |
997 | * before TX. | |
998 | */ | |
999 | desc_rx = dmaengine_prep_slave_sg(master->dma_rx, | |
1000 | rx->sgl, rx->nents, DMA_DEV_TO_MEM, | |
1001 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
1002 | if (!desc_rx) | |
1003 | return -EINVAL; | |
f62caccd | 1004 | |
6b6192c0 SH |
1005 | desc_rx->callback = spi_imx_dma_rx_callback; |
1006 | desc_rx->callback_param = (void *)spi_imx; | |
1007 | dmaengine_submit(desc_rx); | |
1008 | reinit_completion(&spi_imx->dma_rx_completion); | |
1009 | dma_async_issue_pending(master->dma_rx); | |
f62caccd | 1010 | |
6b6192c0 SH |
1011 | desc_tx = dmaengine_prep_slave_sg(master->dma_tx, |
1012 | tx->sgl, tx->nents, DMA_MEM_TO_DEV, | |
1013 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
1014 | if (!desc_tx) { | |
1015 | dmaengine_terminate_all(master->dma_tx); | |
1016 | return -EINVAL; | |
f62caccd RG |
1017 | } |
1018 | ||
6b6192c0 SH |
1019 | desc_tx->callback = spi_imx_dma_tx_callback; |
1020 | desc_tx->callback_param = (void *)spi_imx; | |
1021 | dmaengine_submit(desc_tx); | |
f62caccd | 1022 | reinit_completion(&spi_imx->dma_tx_completion); |
fab44ef1 | 1023 | dma_async_issue_pending(master->dma_tx); |
f62caccd | 1024 | |
4bfe927a AB |
1025 | transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len); |
1026 | ||
f62caccd | 1027 | /* Wait SDMA to finish the data transfer.*/ |
56536a7f | 1028 | timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion, |
4bfe927a | 1029 | transfer_timeout); |
56536a7f | 1030 | if (!timeout) { |
6aa800ca | 1031 | dev_err(spi_imx->dev, "I/O Error in DMA TX\n"); |
f62caccd | 1032 | dmaengine_terminate_all(master->dma_tx); |
e47b33c0 | 1033 | dmaengine_terminate_all(master->dma_rx); |
6b6192c0 | 1034 | return -ETIMEDOUT; |
f62caccd RG |
1035 | } |
1036 | ||
6b6192c0 SH |
1037 | timeout = wait_for_completion_timeout(&spi_imx->dma_rx_completion, |
1038 | transfer_timeout); | |
1039 | if (!timeout) { | |
1040 | dev_err(&master->dev, "I/O Error in DMA RX\n"); | |
1041 | spi_imx->devtype_data->reset(spi_imx); | |
1042 | dmaengine_terminate_all(master->dma_rx); | |
1043 | return -ETIMEDOUT; | |
1044 | } | |
f62caccd | 1045 | |
6b6192c0 | 1046 | return transfer->len; |
f62caccd RG |
1047 | } |
1048 | ||
1049 | static int spi_imx_pio_transfer(struct spi_device *spi, | |
b5f3294f SH |
1050 | struct spi_transfer *transfer) |
1051 | { | |
6cdeb002 | 1052 | struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); |
b5f3294f | 1053 | |
6cdeb002 UKK |
1054 | spi_imx->tx_buf = transfer->tx_buf; |
1055 | spi_imx->rx_buf = transfer->rx_buf; | |
1056 | spi_imx->count = transfer->len; | |
1057 | spi_imx->txfifo = 0; | |
b5f3294f | 1058 | |
aa0fe826 | 1059 | reinit_completion(&spi_imx->xfer_done); |
b5f3294f | 1060 | |
6cdeb002 | 1061 | spi_imx_push(spi_imx); |
b5f3294f | 1062 | |
edd501bb | 1063 | spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE); |
b5f3294f | 1064 | |
6cdeb002 | 1065 | wait_for_completion(&spi_imx->xfer_done); |
b5f3294f SH |
1066 | |
1067 | return transfer->len; | |
1068 | } | |
1069 | ||
f62caccd RG |
1070 | static int spi_imx_transfer(struct spi_device *spi, |
1071 | struct spi_transfer *transfer) | |
1072 | { | |
f62caccd RG |
1073 | struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); |
1074 | ||
c008a800 | 1075 | if (spi_imx->usedma) |
99f1cf1c | 1076 | return spi_imx_dma_transfer(spi_imx, transfer); |
c008a800 SH |
1077 | else |
1078 | return spi_imx_pio_transfer(spi, transfer); | |
f62caccd RG |
1079 | } |
1080 | ||
6cdeb002 | 1081 | static int spi_imx_setup(struct spi_device *spi) |
b5f3294f | 1082 | { |
6c23e5d4 SH |
1083 | struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); |
1084 | int gpio = spi_imx->chipselect[spi->chip_select]; | |
1085 | ||
f4d4ecfe | 1086 | dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__, |
b5f3294f SH |
1087 | spi->mode, spi->bits_per_word, spi->max_speed_hz); |
1088 | ||
8b17e055 | 1089 | if (gpio_is_valid(gpio)) |
6c23e5d4 SH |
1090 | gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH ? 0 : 1); |
1091 | ||
6cdeb002 | 1092 | spi_imx_chipselect(spi, BITBANG_CS_INACTIVE); |
b5f3294f SH |
1093 | |
1094 | return 0; | |
1095 | } | |
1096 | ||
6cdeb002 | 1097 | static void spi_imx_cleanup(struct spi_device *spi) |
b5f3294f SH |
1098 | { |
1099 | } | |
1100 | ||
9e556dcc HS |
1101 | static int |
1102 | spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg) | |
1103 | { | |
1104 | struct spi_imx_data *spi_imx = spi_master_get_devdata(master); | |
1105 | int ret; | |
1106 | ||
1107 | ret = clk_enable(spi_imx->clk_per); | |
1108 | if (ret) | |
1109 | return ret; | |
1110 | ||
1111 | ret = clk_enable(spi_imx->clk_ipg); | |
1112 | if (ret) { | |
1113 | clk_disable(spi_imx->clk_per); | |
1114 | return ret; | |
1115 | } | |
1116 | ||
1117 | return 0; | |
1118 | } | |
1119 | ||
1120 | static int | |
1121 | spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg) | |
1122 | { | |
1123 | struct spi_imx_data *spi_imx = spi_master_get_devdata(master); | |
1124 | ||
1125 | clk_disable(spi_imx->clk_ipg); | |
1126 | clk_disable(spi_imx->clk_per); | |
1127 | return 0; | |
1128 | } | |
1129 | ||
fd4a319b | 1130 | static int spi_imx_probe(struct platform_device *pdev) |
b5f3294f | 1131 | { |
22a85e4c SG |
1132 | struct device_node *np = pdev->dev.of_node; |
1133 | const struct of_device_id *of_id = | |
1134 | of_match_device(spi_imx_dt_ids, &pdev->dev); | |
1135 | struct spi_imx_master *mxc_platform_info = | |
1136 | dev_get_platdata(&pdev->dev); | |
b5f3294f | 1137 | struct spi_master *master; |
6cdeb002 | 1138 | struct spi_imx_data *spi_imx; |
b5f3294f | 1139 | struct resource *res; |
4b5d6aad | 1140 | int i, ret, num_cs, irq; |
b5f3294f | 1141 | |
22a85e4c | 1142 | if (!np && !mxc_platform_info) { |
b5f3294f SH |
1143 | dev_err(&pdev->dev, "can't get the platform data\n"); |
1144 | return -EINVAL; | |
1145 | } | |
1146 | ||
22a85e4c | 1147 | ret = of_property_read_u32(np, "fsl,spi-num-chipselects", &num_cs); |
39ec0d38 LW |
1148 | if (ret < 0) { |
1149 | if (mxc_platform_info) | |
1150 | num_cs = mxc_platform_info->num_chipselect; | |
1151 | else | |
1152 | return ret; | |
1153 | } | |
22a85e4c | 1154 | |
c2387cb9 SG |
1155 | master = spi_alloc_master(&pdev->dev, |
1156 | sizeof(struct spi_imx_data) + sizeof(int) * num_cs); | |
b5f3294f SH |
1157 | if (!master) |
1158 | return -ENOMEM; | |
1159 | ||
1160 | platform_set_drvdata(pdev, master); | |
1161 | ||
24778be2 | 1162 | master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32); |
b5f3294f | 1163 | master->bus_num = pdev->id; |
c2387cb9 | 1164 | master->num_chipselect = num_cs; |
b5f3294f | 1165 | |
6cdeb002 | 1166 | spi_imx = spi_master_get_devdata(master); |
94c69f76 | 1167 | spi_imx->bitbang.master = master; |
6aa800ca | 1168 | spi_imx->dev = &pdev->dev; |
b5f3294f | 1169 | |
4686d1c3 AB |
1170 | spi_imx->devtype_data = of_id ? of_id->data : |
1171 | (struct spi_imx_devtype_data *)pdev->id_entry->driver_data; | |
1172 | ||
b5f3294f | 1173 | for (i = 0; i < master->num_chipselect; i++) { |
22a85e4c | 1174 | int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); |
8b17e055 | 1175 | if (!gpio_is_valid(cs_gpio) && mxc_platform_info) |
22a85e4c | 1176 | cs_gpio = mxc_platform_info->chipselect[i]; |
4cc122ac FE |
1177 | |
1178 | spi_imx->chipselect[i] = cs_gpio; | |
8b17e055 | 1179 | if (!gpio_is_valid(cs_gpio)) |
b5f3294f | 1180 | continue; |
4cc122ac | 1181 | |
130b82c0 FE |
1182 | ret = devm_gpio_request(&pdev->dev, spi_imx->chipselect[i], |
1183 | DRIVER_NAME); | |
b5f3294f | 1184 | if (ret) { |
bbd050af | 1185 | dev_err(&pdev->dev, "can't get cs gpios\n"); |
130b82c0 | 1186 | goto out_master_put; |
b5f3294f | 1187 | } |
b5f3294f SH |
1188 | } |
1189 | ||
6cdeb002 UKK |
1190 | spi_imx->bitbang.chipselect = spi_imx_chipselect; |
1191 | spi_imx->bitbang.setup_transfer = spi_imx_setupxfer; | |
1192 | spi_imx->bitbang.txrx_bufs = spi_imx_transfer; | |
1193 | spi_imx->bitbang.master->setup = spi_imx_setup; | |
1194 | spi_imx->bitbang.master->cleanup = spi_imx_cleanup; | |
9e556dcc HS |
1195 | spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message; |
1196 | spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message; | |
4686d1c3 AB |
1197 | spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; |
1198 | if (is_imx51_ecspi(spi_imx)) | |
1199 | spi_imx->bitbang.master->mode_bits |= SPI_LOOP; | |
b5f3294f | 1200 | |
6cdeb002 | 1201 | init_completion(&spi_imx->xfer_done); |
b5f3294f SH |
1202 | |
1203 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
130b82c0 FE |
1204 | spi_imx->base = devm_ioremap_resource(&pdev->dev, res); |
1205 | if (IS_ERR(spi_imx->base)) { | |
1206 | ret = PTR_ERR(spi_imx->base); | |
1207 | goto out_master_put; | |
b5f3294f | 1208 | } |
f12ae171 | 1209 | spi_imx->base_phys = res->start; |
b5f3294f | 1210 | |
4b5d6aad FE |
1211 | irq = platform_get_irq(pdev, 0); |
1212 | if (irq < 0) { | |
1213 | ret = irq; | |
130b82c0 | 1214 | goto out_master_put; |
b5f3294f SH |
1215 | } |
1216 | ||
4b5d6aad | 1217 | ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0, |
8fc39b51 | 1218 | dev_name(&pdev->dev), spi_imx); |
b5f3294f | 1219 | if (ret) { |
4b5d6aad | 1220 | dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret); |
130b82c0 | 1221 | goto out_master_put; |
b5f3294f SH |
1222 | } |
1223 | ||
aa29d840 SH |
1224 | spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); |
1225 | if (IS_ERR(spi_imx->clk_ipg)) { | |
1226 | ret = PTR_ERR(spi_imx->clk_ipg); | |
130b82c0 | 1227 | goto out_master_put; |
b5f3294f SH |
1228 | } |
1229 | ||
aa29d840 SH |
1230 | spi_imx->clk_per = devm_clk_get(&pdev->dev, "per"); |
1231 | if (IS_ERR(spi_imx->clk_per)) { | |
1232 | ret = PTR_ERR(spi_imx->clk_per); | |
130b82c0 | 1233 | goto out_master_put; |
aa29d840 SH |
1234 | } |
1235 | ||
83174626 FE |
1236 | ret = clk_prepare_enable(spi_imx->clk_per); |
1237 | if (ret) | |
1238 | goto out_master_put; | |
1239 | ||
1240 | ret = clk_prepare_enable(spi_imx->clk_ipg); | |
1241 | if (ret) | |
1242 | goto out_put_per; | |
aa29d840 SH |
1243 | |
1244 | spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per); | |
f62caccd RG |
1245 | /* |
1246 | * Only validated on i.mx6 now, can remove the constrain if validated on | |
1247 | * other chips. | |
1248 | */ | |
3760047a | 1249 | if (is_imx51_ecspi(spi_imx)) { |
f12ae171 | 1250 | ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master); |
bf9af08c AB |
1251 | if (ret == -EPROBE_DEFER) |
1252 | goto out_clk_put; | |
1253 | ||
3760047a AB |
1254 | if (ret < 0) |
1255 | dev_err(&pdev->dev, "dma setup error %d, use pio\n", | |
1256 | ret); | |
1257 | } | |
b5f3294f | 1258 | |
edd501bb | 1259 | spi_imx->devtype_data->reset(spi_imx); |
ce1807b2 | 1260 | |
edd501bb | 1261 | spi_imx->devtype_data->intctrl(spi_imx, 0); |
b5f3294f | 1262 | |
22a85e4c | 1263 | master->dev.of_node = pdev->dev.of_node; |
6cdeb002 | 1264 | ret = spi_bitbang_start(&spi_imx->bitbang); |
b5f3294f SH |
1265 | if (ret) { |
1266 | dev_err(&pdev->dev, "bitbang start failed with %d\n", ret); | |
1267 | goto out_clk_put; | |
1268 | } | |
1269 | ||
1270 | dev_info(&pdev->dev, "probed\n"); | |
1271 | ||
9e556dcc HS |
1272 | clk_disable(spi_imx->clk_ipg); |
1273 | clk_disable(spi_imx->clk_per); | |
b5f3294f SH |
1274 | return ret; |
1275 | ||
1276 | out_clk_put: | |
aa29d840 | 1277 | clk_disable_unprepare(spi_imx->clk_ipg); |
83174626 FE |
1278 | out_put_per: |
1279 | clk_disable_unprepare(spi_imx->clk_per); | |
130b82c0 | 1280 | out_master_put: |
b5f3294f | 1281 | spi_master_put(master); |
130b82c0 | 1282 | |
b5f3294f SH |
1283 | return ret; |
1284 | } | |
1285 | ||
fd4a319b | 1286 | static int spi_imx_remove(struct platform_device *pdev) |
b5f3294f SH |
1287 | { |
1288 | struct spi_master *master = platform_get_drvdata(pdev); | |
6cdeb002 | 1289 | struct spi_imx_data *spi_imx = spi_master_get_devdata(master); |
b5f3294f | 1290 | |
6cdeb002 | 1291 | spi_bitbang_stop(&spi_imx->bitbang); |
b5f3294f | 1292 | |
6cdeb002 | 1293 | writel(0, spi_imx->base + MXC_CSPICTRL); |
fd40dccb PDM |
1294 | clk_unprepare(spi_imx->clk_ipg); |
1295 | clk_unprepare(spi_imx->clk_per); | |
f62caccd | 1296 | spi_imx_sdma_exit(spi_imx); |
b5f3294f SH |
1297 | spi_master_put(master); |
1298 | ||
b5f3294f SH |
1299 | return 0; |
1300 | } | |
1301 | ||
6cdeb002 | 1302 | static struct platform_driver spi_imx_driver = { |
b5f3294f SH |
1303 | .driver = { |
1304 | .name = DRIVER_NAME, | |
22a85e4c | 1305 | .of_match_table = spi_imx_dt_ids, |
b5f3294f | 1306 | }, |
f4ba6315 | 1307 | .id_table = spi_imx_devtype, |
6cdeb002 | 1308 | .probe = spi_imx_probe, |
fd4a319b | 1309 | .remove = spi_imx_remove, |
b5f3294f | 1310 | }; |
940ab889 | 1311 | module_platform_driver(spi_imx_driver); |
b5f3294f SH |
1312 | |
1313 | MODULE_DESCRIPTION("SPI Master Controller driver"); | |
1314 | MODULE_AUTHOR("Sascha Hauer, Pengutronix"); | |
1315 | MODULE_LICENSE("GPL"); | |
3133fba3 | 1316 | MODULE_ALIAS("platform:" DRIVER_NAME); |