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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) | |
59 | #define IMX_DMA_TIMEOUT (msecs_to_jiffies(3000)) | |
6cdeb002 | 60 | struct spi_imx_config { |
b5f3294f SH |
61 | unsigned int speed_hz; |
62 | unsigned int bpw; | |
63 | unsigned int mode; | |
3b2aa89e | 64 | u8 cs; |
b5f3294f SH |
65 | }; |
66 | ||
f4ba6315 | 67 | enum spi_imx_devtype { |
04ee5854 SG |
68 | IMX1_CSPI, |
69 | IMX21_CSPI, | |
70 | IMX27_CSPI, | |
71 | IMX31_CSPI, | |
72 | IMX35_CSPI, /* CSPI on all i.mx except above */ | |
73 | IMX51_ECSPI, /* ECSPI on i.mx51 and later */ | |
f4ba6315 UKK |
74 | }; |
75 | ||
76 | struct spi_imx_data; | |
77 | ||
78 | struct spi_imx_devtype_data { | |
79 | void (*intctrl)(struct spi_imx_data *, int); | |
80 | int (*config)(struct spi_imx_data *, struct spi_imx_config *); | |
81 | void (*trigger)(struct spi_imx_data *); | |
82 | int (*rx_available)(struct spi_imx_data *); | |
1723e66b | 83 | void (*reset)(struct spi_imx_data *); |
04ee5854 | 84 | enum spi_imx_devtype devtype; |
f4ba6315 UKK |
85 | }; |
86 | ||
6cdeb002 | 87 | struct spi_imx_data { |
b5f3294f SH |
88 | struct spi_bitbang bitbang; |
89 | ||
90 | struct completion xfer_done; | |
cc4d22ae | 91 | void __iomem *base; |
aa29d840 SH |
92 | struct clk *clk_per; |
93 | struct clk *clk_ipg; | |
b5f3294f | 94 | unsigned long spi_clk; |
b5f3294f SH |
95 | |
96 | unsigned int count; | |
6cdeb002 UKK |
97 | void (*tx)(struct spi_imx_data *); |
98 | void (*rx)(struct spi_imx_data *); | |
b5f3294f SH |
99 | void *rx_buf; |
100 | const void *tx_buf; | |
101 | unsigned int txfifo; /* number of words pushed in tx FIFO */ | |
102 | ||
f62caccd RG |
103 | /* DMA */ |
104 | unsigned int dma_is_inited; | |
105 | unsigned int dma_finished; | |
106 | bool usedma; | |
107 | u32 rx_wml; | |
108 | u32 tx_wml; | |
109 | u32 rxt_wml; | |
110 | struct completion dma_rx_completion; | |
111 | struct completion dma_tx_completion; | |
112 | ||
80023cb3 | 113 | const struct spi_imx_devtype_data *devtype_data; |
c2387cb9 | 114 | int chipselect[0]; |
b5f3294f SH |
115 | }; |
116 | ||
04ee5854 SG |
117 | static inline int is_imx27_cspi(struct spi_imx_data *d) |
118 | { | |
119 | return d->devtype_data->devtype == IMX27_CSPI; | |
120 | } | |
121 | ||
122 | static inline int is_imx35_cspi(struct spi_imx_data *d) | |
123 | { | |
124 | return d->devtype_data->devtype == IMX35_CSPI; | |
125 | } | |
126 | ||
127 | static inline unsigned spi_imx_get_fifosize(struct spi_imx_data *d) | |
128 | { | |
129 | return (d->devtype_data->devtype == IMX51_ECSPI) ? 64 : 8; | |
130 | } | |
131 | ||
b5f3294f | 132 | #define MXC_SPI_BUF_RX(type) \ |
6cdeb002 | 133 | static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx) \ |
b5f3294f | 134 | { \ |
6cdeb002 | 135 | unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); \ |
b5f3294f | 136 | \ |
6cdeb002 UKK |
137 | if (spi_imx->rx_buf) { \ |
138 | *(type *)spi_imx->rx_buf = val; \ | |
139 | spi_imx->rx_buf += sizeof(type); \ | |
b5f3294f SH |
140 | } \ |
141 | } | |
142 | ||
143 | #define MXC_SPI_BUF_TX(type) \ | |
6cdeb002 | 144 | static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx) \ |
b5f3294f SH |
145 | { \ |
146 | type val = 0; \ | |
147 | \ | |
6cdeb002 UKK |
148 | if (spi_imx->tx_buf) { \ |
149 | val = *(type *)spi_imx->tx_buf; \ | |
150 | spi_imx->tx_buf += sizeof(type); \ | |
b5f3294f SH |
151 | } \ |
152 | \ | |
6cdeb002 | 153 | spi_imx->count -= sizeof(type); \ |
b5f3294f | 154 | \ |
6cdeb002 | 155 | writel(val, spi_imx->base + MXC_CSPITXDATA); \ |
b5f3294f SH |
156 | } |
157 | ||
158 | MXC_SPI_BUF_RX(u8) | |
159 | MXC_SPI_BUF_TX(u8) | |
160 | MXC_SPI_BUF_RX(u16) | |
161 | MXC_SPI_BUF_TX(u16) | |
162 | MXC_SPI_BUF_RX(u32) | |
163 | MXC_SPI_BUF_TX(u32) | |
164 | ||
165 | /* First entry is reserved, second entry is valid only if SDHC_SPIEN is set | |
166 | * (which is currently not the case in this driver) | |
167 | */ | |
168 | static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, | |
169 | 256, 384, 512, 768, 1024}; | |
170 | ||
171 | /* MX21, MX27 */ | |
6cdeb002 | 172 | static unsigned int spi_imx_clkdiv_1(unsigned int fin, |
04ee5854 | 173 | unsigned int fspi, unsigned int max) |
b5f3294f | 174 | { |
04ee5854 | 175 | int i; |
b5f3294f SH |
176 | |
177 | for (i = 2; i < max; i++) | |
178 | if (fspi * mxc_clkdivs[i] >= fin) | |
179 | return i; | |
180 | ||
181 | return max; | |
182 | } | |
183 | ||
0b599603 | 184 | /* MX1, MX31, MX35, MX51 CSPI */ |
6cdeb002 | 185 | static unsigned int spi_imx_clkdiv_2(unsigned int fin, |
b5f3294f SH |
186 | unsigned int fspi) |
187 | { | |
188 | int i, div = 4; | |
189 | ||
190 | for (i = 0; i < 7; i++) { | |
191 | if (fspi * div >= fin) | |
192 | return i; | |
193 | div <<= 1; | |
194 | } | |
195 | ||
196 | return 7; | |
197 | } | |
198 | ||
f62caccd RG |
199 | static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, |
200 | struct spi_transfer *transfer) | |
201 | { | |
202 | struct spi_imx_data *spi_imx = spi_master_get_devdata(master); | |
203 | ||
204 | if (spi_imx->dma_is_inited && (transfer->len > spi_imx->rx_wml) | |
205 | && (transfer->len > spi_imx->tx_wml)) | |
206 | return true; | |
207 | return false; | |
208 | } | |
209 | ||
66de757c SG |
210 | #define MX51_ECSPI_CTRL 0x08 |
211 | #define MX51_ECSPI_CTRL_ENABLE (1 << 0) | |
212 | #define MX51_ECSPI_CTRL_XCH (1 << 2) | |
f62caccd | 213 | #define MX51_ECSPI_CTRL_SMC (1 << 3) |
66de757c SG |
214 | #define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4) |
215 | #define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8 | |
216 | #define MX51_ECSPI_CTRL_PREDIV_OFFSET 12 | |
217 | #define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18) | |
218 | #define MX51_ECSPI_CTRL_BL_OFFSET 20 | |
219 | ||
220 | #define MX51_ECSPI_CONFIG 0x0c | |
221 | #define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0)) | |
222 | #define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs) + 4)) | |
223 | #define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs) + 8)) | |
224 | #define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs) + 12)) | |
c09b890b | 225 | #define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs) + 20)) |
66de757c SG |
226 | |
227 | #define MX51_ECSPI_INT 0x10 | |
228 | #define MX51_ECSPI_INT_TEEN (1 << 0) | |
229 | #define MX51_ECSPI_INT_RREN (1 << 3) | |
230 | ||
f62caccd RG |
231 | #define MX51_ECSPI_DMA 0x14 |
232 | #define MX51_ECSPI_DMA_TX_WML_OFFSET 0 | |
233 | #define MX51_ECSPI_DMA_TX_WML_MASK 0x3F | |
234 | #define MX51_ECSPI_DMA_RX_WML_OFFSET 16 | |
235 | #define MX51_ECSPI_DMA_RX_WML_MASK (0x3F << 16) | |
236 | #define MX51_ECSPI_DMA_RXT_WML_OFFSET 24 | |
237 | #define MX51_ECSPI_DMA_RXT_WML_MASK (0x3F << 24) | |
238 | ||
239 | #define MX51_ECSPI_DMA_TEDEN_OFFSET 7 | |
240 | #define MX51_ECSPI_DMA_RXDEN_OFFSET 23 | |
241 | #define MX51_ECSPI_DMA_RXTDEN_OFFSET 31 | |
242 | ||
66de757c SG |
243 | #define MX51_ECSPI_STAT 0x18 |
244 | #define MX51_ECSPI_STAT_RR (1 << 3) | |
0b599603 UKK |
245 | |
246 | /* MX51 eCSPI */ | |
6fd8b850 MV |
247 | static unsigned int mx51_ecspi_clkdiv(unsigned int fin, unsigned int fspi, |
248 | unsigned int *fres) | |
0b599603 UKK |
249 | { |
250 | /* | |
251 | * there are two 4-bit dividers, the pre-divider divides by | |
252 | * $pre, the post-divider by 2^$post | |
253 | */ | |
254 | unsigned int pre, post; | |
255 | ||
256 | if (unlikely(fspi > fin)) | |
257 | return 0; | |
258 | ||
259 | post = fls(fin) - fls(fspi); | |
260 | if (fin > fspi << post) | |
261 | post++; | |
262 | ||
263 | /* now we have: (fin <= fspi << post) with post being minimal */ | |
264 | ||
265 | post = max(4U, post) - 4; | |
266 | if (unlikely(post > 0xf)) { | |
267 | pr_err("%s: cannot set clock freq: %u (base freq: %u)\n", | |
268 | __func__, fspi, fin); | |
269 | return 0xff; | |
270 | } | |
271 | ||
272 | pre = DIV_ROUND_UP(fin, fspi << post) - 1; | |
273 | ||
274 | pr_debug("%s: fin: %u, fspi: %u, post: %u, pre: %u\n", | |
275 | __func__, fin, fspi, post, pre); | |
6fd8b850 MV |
276 | |
277 | /* Resulting frequency for the SCLK line. */ | |
278 | *fres = (fin / (pre + 1)) >> post; | |
279 | ||
66de757c SG |
280 | return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) | |
281 | (post << MX51_ECSPI_CTRL_POSTDIV_OFFSET); | |
0b599603 UKK |
282 | } |
283 | ||
66de757c | 284 | static void __maybe_unused mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable) |
0b599603 UKK |
285 | { |
286 | unsigned val = 0; | |
287 | ||
288 | if (enable & MXC_INT_TE) | |
66de757c | 289 | val |= MX51_ECSPI_INT_TEEN; |
0b599603 UKK |
290 | |
291 | if (enable & MXC_INT_RR) | |
66de757c | 292 | val |= MX51_ECSPI_INT_RREN; |
0b599603 | 293 | |
66de757c | 294 | writel(val, spi_imx->base + MX51_ECSPI_INT); |
0b599603 UKK |
295 | } |
296 | ||
66de757c | 297 | static void __maybe_unused mx51_ecspi_trigger(struct spi_imx_data *spi_imx) |
0b599603 | 298 | { |
f62caccd RG |
299 | u32 reg = readl(spi_imx->base + MX51_ECSPI_CTRL); |
300 | ||
301 | if (!spi_imx->usedma) | |
302 | reg |= MX51_ECSPI_CTRL_XCH; | |
303 | else if (!spi_imx->dma_finished) | |
304 | reg |= MX51_ECSPI_CTRL_SMC; | |
305 | else | |
306 | reg &= ~MX51_ECSPI_CTRL_SMC; | |
66de757c | 307 | writel(reg, spi_imx->base + MX51_ECSPI_CTRL); |
0b599603 UKK |
308 | } |
309 | ||
66de757c | 310 | static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, |
0b599603 UKK |
311 | struct spi_imx_config *config) |
312 | { | |
f62caccd RG |
313 | u32 ctrl = MX51_ECSPI_CTRL_ENABLE, cfg = 0, dma = 0; |
314 | u32 tx_wml_cfg, rx_wml_cfg, rxt_wml_cfg; | |
6fd8b850 | 315 | u32 clk = config->speed_hz, delay; |
0b599603 | 316 | |
f020c39e SH |
317 | /* |
318 | * The hardware seems to have a race condition when changing modes. The | |
319 | * current assumption is that the selection of the channel arrives | |
320 | * earlier in the hardware than the mode bits when they are written at | |
321 | * the same time. | |
322 | * So set master mode for all channels as we do not support slave mode. | |
323 | */ | |
66de757c | 324 | ctrl |= MX51_ECSPI_CTRL_MODE_MASK; |
0b599603 UKK |
325 | |
326 | /* set clock speed */ | |
6fd8b850 | 327 | ctrl |= mx51_ecspi_clkdiv(spi_imx->spi_clk, config->speed_hz, &clk); |
0b599603 UKK |
328 | |
329 | /* set chip select to use */ | |
66de757c | 330 | ctrl |= MX51_ECSPI_CTRL_CS(config->cs); |
0b599603 | 331 | |
66de757c | 332 | ctrl |= (config->bpw - 1) << MX51_ECSPI_CTRL_BL_OFFSET; |
0b599603 | 333 | |
66de757c | 334 | cfg |= MX51_ECSPI_CONFIG_SBBCTRL(config->cs); |
0b599603 UKK |
335 | |
336 | if (config->mode & SPI_CPHA) | |
66de757c | 337 | cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs); |
0b599603 | 338 | |
c09b890b | 339 | if (config->mode & SPI_CPOL) { |
66de757c | 340 | cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs); |
c09b890b KW |
341 | cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs); |
342 | } | |
0b599603 | 343 | if (config->mode & SPI_CS_HIGH) |
66de757c | 344 | cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs); |
0b599603 | 345 | |
66de757c SG |
346 | writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); |
347 | writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG); | |
0b599603 | 348 | |
6fd8b850 MV |
349 | /* |
350 | * Wait until the changes in the configuration register CONFIGREG | |
351 | * propagate into the hardware. It takes exactly one tick of the | |
352 | * SCLK clock, but we will wait two SCLK clock just to be sure. The | |
353 | * effect of the delay it takes for the hardware to apply changes | |
354 | * is noticable if the SCLK clock run very slow. In such a case, if | |
355 | * the polarity of SCLK should be inverted, the GPIO ChipSelect might | |
356 | * be asserted before the SCLK polarity changes, which would disrupt | |
357 | * the SPI communication as the device on the other end would consider | |
358 | * the change of SCLK polarity as a clock tick already. | |
359 | */ | |
360 | delay = (2 * 1000000) / clk; | |
361 | if (likely(delay < 10)) /* SCLK is faster than 100 kHz */ | |
362 | udelay(delay); | |
363 | else /* SCLK is _very_ slow */ | |
364 | usleep_range(delay, delay + 10); | |
365 | ||
f62caccd RG |
366 | /* |
367 | * Configure the DMA register: setup the watermark | |
368 | * and enable DMA request. | |
369 | */ | |
370 | if (spi_imx->dma_is_inited) { | |
371 | dma = readl(spi_imx->base + MX51_ECSPI_DMA); | |
372 | ||
f62caccd RG |
373 | spi_imx->rxt_wml = spi_imx_get_fifosize(spi_imx) / 2; |
374 | rx_wml_cfg = spi_imx->rx_wml << MX51_ECSPI_DMA_RX_WML_OFFSET; | |
375 | tx_wml_cfg = spi_imx->tx_wml << MX51_ECSPI_DMA_TX_WML_OFFSET; | |
376 | rxt_wml_cfg = spi_imx->rxt_wml << MX51_ECSPI_DMA_RXT_WML_OFFSET; | |
377 | dma = (dma & ~MX51_ECSPI_DMA_TX_WML_MASK | |
378 | & ~MX51_ECSPI_DMA_RX_WML_MASK | |
379 | & ~MX51_ECSPI_DMA_RXT_WML_MASK) | |
380 | | rx_wml_cfg | tx_wml_cfg | rxt_wml_cfg | |
381 | |(1 << MX51_ECSPI_DMA_TEDEN_OFFSET) | |
382 | |(1 << MX51_ECSPI_DMA_RXDEN_OFFSET) | |
383 | |(1 << MX51_ECSPI_DMA_RXTDEN_OFFSET); | |
384 | ||
385 | writel(dma, spi_imx->base + MX51_ECSPI_DMA); | |
386 | } | |
387 | ||
0b599603 UKK |
388 | return 0; |
389 | } | |
390 | ||
66de757c | 391 | static int __maybe_unused mx51_ecspi_rx_available(struct spi_imx_data *spi_imx) |
0b599603 | 392 | { |
66de757c | 393 | return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR; |
0b599603 UKK |
394 | } |
395 | ||
66de757c | 396 | static void __maybe_unused mx51_ecspi_reset(struct spi_imx_data *spi_imx) |
0b599603 UKK |
397 | { |
398 | /* drain receive buffer */ | |
66de757c | 399 | while (mx51_ecspi_rx_available(spi_imx)) |
0b599603 UKK |
400 | readl(spi_imx->base + MXC_CSPIRXDATA); |
401 | } | |
402 | ||
b5f3294f SH |
403 | #define MX31_INTREG_TEEN (1 << 0) |
404 | #define MX31_INTREG_RREN (1 << 3) | |
405 | ||
406 | #define MX31_CSPICTRL_ENABLE (1 << 0) | |
407 | #define MX31_CSPICTRL_MASTER (1 << 1) | |
408 | #define MX31_CSPICTRL_XCH (1 << 2) | |
409 | #define MX31_CSPICTRL_POL (1 << 4) | |
410 | #define MX31_CSPICTRL_PHA (1 << 5) | |
411 | #define MX31_CSPICTRL_SSCTL (1 << 6) | |
412 | #define MX31_CSPICTRL_SSPOL (1 << 7) | |
413 | #define MX31_CSPICTRL_BC_SHIFT 8 | |
414 | #define MX35_CSPICTRL_BL_SHIFT 20 | |
415 | #define MX31_CSPICTRL_CS_SHIFT 24 | |
416 | #define MX35_CSPICTRL_CS_SHIFT 12 | |
417 | #define MX31_CSPICTRL_DR_SHIFT 16 | |
418 | ||
419 | #define MX31_CSPISTATUS 0x14 | |
420 | #define MX31_STATUS_RR (1 << 3) | |
421 | ||
422 | /* These functions also work for the i.MX35, but be aware that | |
423 | * the i.MX35 has a slightly different register layout for bits | |
424 | * we do not use here. | |
425 | */ | |
f4ba6315 | 426 | static void __maybe_unused mx31_intctrl(struct spi_imx_data *spi_imx, int enable) |
b5f3294f SH |
427 | { |
428 | unsigned int val = 0; | |
429 | ||
430 | if (enable & MXC_INT_TE) | |
431 | val |= MX31_INTREG_TEEN; | |
432 | if (enable & MXC_INT_RR) | |
433 | val |= MX31_INTREG_RREN; | |
434 | ||
6cdeb002 | 435 | writel(val, spi_imx->base + MXC_CSPIINT); |
b5f3294f SH |
436 | } |
437 | ||
f4ba6315 | 438 | static void __maybe_unused mx31_trigger(struct spi_imx_data *spi_imx) |
b5f3294f SH |
439 | { |
440 | unsigned int reg; | |
441 | ||
6cdeb002 | 442 | reg = readl(spi_imx->base + MXC_CSPICTRL); |
b5f3294f | 443 | reg |= MX31_CSPICTRL_XCH; |
6cdeb002 | 444 | writel(reg, spi_imx->base + MXC_CSPICTRL); |
b5f3294f SH |
445 | } |
446 | ||
2a64a90a | 447 | static int __maybe_unused mx31_config(struct spi_imx_data *spi_imx, |
1723e66b UKK |
448 | struct spi_imx_config *config) |
449 | { | |
450 | unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER; | |
3b2aa89e | 451 | int cs = spi_imx->chipselect[config->cs]; |
1723e66b UKK |
452 | |
453 | reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) << | |
454 | MX31_CSPICTRL_DR_SHIFT; | |
455 | ||
04ee5854 | 456 | if (is_imx35_cspi(spi_imx)) { |
2a64a90a SG |
457 | reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT; |
458 | reg |= MX31_CSPICTRL_SSCTL; | |
459 | } else { | |
460 | reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT; | |
461 | } | |
1723e66b UKK |
462 | |
463 | if (config->mode & SPI_CPHA) | |
464 | reg |= MX31_CSPICTRL_PHA; | |
465 | if (config->mode & SPI_CPOL) | |
466 | reg |= MX31_CSPICTRL_POL; | |
467 | if (config->mode & SPI_CS_HIGH) | |
468 | reg |= MX31_CSPICTRL_SSPOL; | |
3b2aa89e | 469 | if (cs < 0) |
2a64a90a | 470 | reg |= (cs + 32) << |
04ee5854 SG |
471 | (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT : |
472 | MX31_CSPICTRL_CS_SHIFT); | |
1723e66b UKK |
473 | |
474 | writel(reg, spi_imx->base + MXC_CSPICTRL); | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
f4ba6315 | 479 | static int __maybe_unused mx31_rx_available(struct spi_imx_data *spi_imx) |
b5f3294f | 480 | { |
6cdeb002 | 481 | return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR; |
b5f3294f SH |
482 | } |
483 | ||
2a64a90a | 484 | static void __maybe_unused mx31_reset(struct spi_imx_data *spi_imx) |
1723e66b UKK |
485 | { |
486 | /* drain receive buffer */ | |
2a64a90a | 487 | while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR) |
1723e66b UKK |
488 | readl(spi_imx->base + MXC_CSPIRXDATA); |
489 | } | |
490 | ||
3451fb15 SG |
491 | #define MX21_INTREG_RR (1 << 4) |
492 | #define MX21_INTREG_TEEN (1 << 9) | |
493 | #define MX21_INTREG_RREN (1 << 13) | |
494 | ||
495 | #define MX21_CSPICTRL_POL (1 << 5) | |
496 | #define MX21_CSPICTRL_PHA (1 << 6) | |
497 | #define MX21_CSPICTRL_SSPOL (1 << 8) | |
498 | #define MX21_CSPICTRL_XCH (1 << 9) | |
499 | #define MX21_CSPICTRL_ENABLE (1 << 10) | |
500 | #define MX21_CSPICTRL_MASTER (1 << 11) | |
501 | #define MX21_CSPICTRL_DR_SHIFT 14 | |
502 | #define MX21_CSPICTRL_CS_SHIFT 19 | |
503 | ||
504 | static void __maybe_unused mx21_intctrl(struct spi_imx_data *spi_imx, int enable) | |
b5f3294f SH |
505 | { |
506 | unsigned int val = 0; | |
507 | ||
508 | if (enable & MXC_INT_TE) | |
3451fb15 | 509 | val |= MX21_INTREG_TEEN; |
b5f3294f | 510 | if (enable & MXC_INT_RR) |
3451fb15 | 511 | val |= MX21_INTREG_RREN; |
b5f3294f | 512 | |
6cdeb002 | 513 | writel(val, spi_imx->base + MXC_CSPIINT); |
b5f3294f SH |
514 | } |
515 | ||
3451fb15 | 516 | static void __maybe_unused mx21_trigger(struct spi_imx_data *spi_imx) |
b5f3294f SH |
517 | { |
518 | unsigned int reg; | |
519 | ||
6cdeb002 | 520 | reg = readl(spi_imx->base + MXC_CSPICTRL); |
3451fb15 | 521 | reg |= MX21_CSPICTRL_XCH; |
6cdeb002 | 522 | writel(reg, spi_imx->base + MXC_CSPICTRL); |
b5f3294f SH |
523 | } |
524 | ||
3451fb15 | 525 | static int __maybe_unused mx21_config(struct spi_imx_data *spi_imx, |
6cdeb002 | 526 | struct spi_imx_config *config) |
b5f3294f | 527 | { |
3451fb15 | 528 | unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER; |
3b2aa89e | 529 | int cs = spi_imx->chipselect[config->cs]; |
04ee5854 | 530 | unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18; |
b5f3294f | 531 | |
04ee5854 | 532 | reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max) << |
3451fb15 | 533 | MX21_CSPICTRL_DR_SHIFT; |
b5f3294f SH |
534 | reg |= config->bpw - 1; |
535 | ||
536 | if (config->mode & SPI_CPHA) | |
3451fb15 | 537 | reg |= MX21_CSPICTRL_PHA; |
b5f3294f | 538 | if (config->mode & SPI_CPOL) |
3451fb15 | 539 | reg |= MX21_CSPICTRL_POL; |
b5f3294f | 540 | if (config->mode & SPI_CS_HIGH) |
3451fb15 | 541 | reg |= MX21_CSPICTRL_SSPOL; |
3b2aa89e | 542 | if (cs < 0) |
3451fb15 | 543 | reg |= (cs + 32) << MX21_CSPICTRL_CS_SHIFT; |
b5f3294f | 544 | |
6cdeb002 | 545 | writel(reg, spi_imx->base + MXC_CSPICTRL); |
b5f3294f SH |
546 | |
547 | return 0; | |
548 | } | |
549 | ||
3451fb15 | 550 | static int __maybe_unused mx21_rx_available(struct spi_imx_data *spi_imx) |
b5f3294f | 551 | { |
3451fb15 | 552 | return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR; |
b5f3294f SH |
553 | } |
554 | ||
3451fb15 | 555 | static void __maybe_unused mx21_reset(struct spi_imx_data *spi_imx) |
1723e66b UKK |
556 | { |
557 | writel(1, spi_imx->base + MXC_RESET); | |
558 | } | |
559 | ||
b5f3294f SH |
560 | #define MX1_INTREG_RR (1 << 3) |
561 | #define MX1_INTREG_TEEN (1 << 8) | |
562 | #define MX1_INTREG_RREN (1 << 11) | |
563 | ||
564 | #define MX1_CSPICTRL_POL (1 << 4) | |
565 | #define MX1_CSPICTRL_PHA (1 << 5) | |
566 | #define MX1_CSPICTRL_XCH (1 << 8) | |
567 | #define MX1_CSPICTRL_ENABLE (1 << 9) | |
568 | #define MX1_CSPICTRL_MASTER (1 << 10) | |
569 | #define MX1_CSPICTRL_DR_SHIFT 13 | |
570 | ||
f4ba6315 | 571 | static void __maybe_unused mx1_intctrl(struct spi_imx_data *spi_imx, int enable) |
b5f3294f SH |
572 | { |
573 | unsigned int val = 0; | |
574 | ||
575 | if (enable & MXC_INT_TE) | |
576 | val |= MX1_INTREG_TEEN; | |
577 | if (enable & MXC_INT_RR) | |
578 | val |= MX1_INTREG_RREN; | |
579 | ||
6cdeb002 | 580 | writel(val, spi_imx->base + MXC_CSPIINT); |
b5f3294f SH |
581 | } |
582 | ||
f4ba6315 | 583 | static void __maybe_unused mx1_trigger(struct spi_imx_data *spi_imx) |
b5f3294f SH |
584 | { |
585 | unsigned int reg; | |
586 | ||
6cdeb002 | 587 | reg = readl(spi_imx->base + MXC_CSPICTRL); |
b5f3294f | 588 | reg |= MX1_CSPICTRL_XCH; |
6cdeb002 | 589 | writel(reg, spi_imx->base + MXC_CSPICTRL); |
b5f3294f SH |
590 | } |
591 | ||
f4ba6315 | 592 | static int __maybe_unused mx1_config(struct spi_imx_data *spi_imx, |
6cdeb002 | 593 | struct spi_imx_config *config) |
b5f3294f SH |
594 | { |
595 | unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER; | |
596 | ||
6cdeb002 | 597 | reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) << |
b5f3294f SH |
598 | MX1_CSPICTRL_DR_SHIFT; |
599 | reg |= config->bpw - 1; | |
600 | ||
601 | if (config->mode & SPI_CPHA) | |
602 | reg |= MX1_CSPICTRL_PHA; | |
603 | if (config->mode & SPI_CPOL) | |
604 | reg |= MX1_CSPICTRL_POL; | |
605 | ||
6cdeb002 | 606 | writel(reg, spi_imx->base + MXC_CSPICTRL); |
b5f3294f SH |
607 | |
608 | return 0; | |
609 | } | |
610 | ||
f4ba6315 | 611 | static int __maybe_unused mx1_rx_available(struct spi_imx_data *spi_imx) |
b5f3294f | 612 | { |
6cdeb002 | 613 | return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR; |
b5f3294f SH |
614 | } |
615 | ||
1723e66b UKK |
616 | static void __maybe_unused mx1_reset(struct spi_imx_data *spi_imx) |
617 | { | |
618 | writel(1, spi_imx->base + MXC_RESET); | |
619 | } | |
620 | ||
04ee5854 SG |
621 | static struct spi_imx_devtype_data imx1_cspi_devtype_data = { |
622 | .intctrl = mx1_intctrl, | |
623 | .config = mx1_config, | |
624 | .trigger = mx1_trigger, | |
625 | .rx_available = mx1_rx_available, | |
626 | .reset = mx1_reset, | |
627 | .devtype = IMX1_CSPI, | |
628 | }; | |
629 | ||
630 | static struct spi_imx_devtype_data imx21_cspi_devtype_data = { | |
631 | .intctrl = mx21_intctrl, | |
632 | .config = mx21_config, | |
633 | .trigger = mx21_trigger, | |
634 | .rx_available = mx21_rx_available, | |
635 | .reset = mx21_reset, | |
636 | .devtype = IMX21_CSPI, | |
637 | }; | |
638 | ||
639 | static struct spi_imx_devtype_data imx27_cspi_devtype_data = { | |
640 | /* i.mx27 cspi shares the functions with i.mx21 one */ | |
641 | .intctrl = mx21_intctrl, | |
642 | .config = mx21_config, | |
643 | .trigger = mx21_trigger, | |
644 | .rx_available = mx21_rx_available, | |
645 | .reset = mx21_reset, | |
646 | .devtype = IMX27_CSPI, | |
647 | }; | |
648 | ||
649 | static struct spi_imx_devtype_data imx31_cspi_devtype_data = { | |
650 | .intctrl = mx31_intctrl, | |
651 | .config = mx31_config, | |
652 | .trigger = mx31_trigger, | |
653 | .rx_available = mx31_rx_available, | |
654 | .reset = mx31_reset, | |
655 | .devtype = IMX31_CSPI, | |
656 | }; | |
657 | ||
658 | static struct spi_imx_devtype_data imx35_cspi_devtype_data = { | |
659 | /* i.mx35 and later cspi shares the functions with i.mx31 one */ | |
660 | .intctrl = mx31_intctrl, | |
661 | .config = mx31_config, | |
662 | .trigger = mx31_trigger, | |
663 | .rx_available = mx31_rx_available, | |
664 | .reset = mx31_reset, | |
665 | .devtype = IMX35_CSPI, | |
666 | }; | |
667 | ||
668 | static struct spi_imx_devtype_data imx51_ecspi_devtype_data = { | |
669 | .intctrl = mx51_ecspi_intctrl, | |
670 | .config = mx51_ecspi_config, | |
671 | .trigger = mx51_ecspi_trigger, | |
672 | .rx_available = mx51_ecspi_rx_available, | |
673 | .reset = mx51_ecspi_reset, | |
674 | .devtype = IMX51_ECSPI, | |
675 | }; | |
676 | ||
db1b8200 | 677 | static const struct platform_device_id spi_imx_devtype[] = { |
04ee5854 SG |
678 | { |
679 | .name = "imx1-cspi", | |
680 | .driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data, | |
681 | }, { | |
682 | .name = "imx21-cspi", | |
683 | .driver_data = (kernel_ulong_t) &imx21_cspi_devtype_data, | |
684 | }, { | |
685 | .name = "imx27-cspi", | |
686 | .driver_data = (kernel_ulong_t) &imx27_cspi_devtype_data, | |
687 | }, { | |
688 | .name = "imx31-cspi", | |
689 | .driver_data = (kernel_ulong_t) &imx31_cspi_devtype_data, | |
690 | }, { | |
691 | .name = "imx35-cspi", | |
692 | .driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data, | |
693 | }, { | |
694 | .name = "imx51-ecspi", | |
695 | .driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data, | |
696 | }, { | |
697 | /* sentinel */ | |
698 | } | |
f4ba6315 UKK |
699 | }; |
700 | ||
22a85e4c SG |
701 | static const struct of_device_id spi_imx_dt_ids[] = { |
702 | { .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, }, | |
703 | { .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, }, | |
704 | { .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, }, | |
705 | { .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, }, | |
706 | { .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, }, | |
707 | { .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, }, | |
708 | { /* sentinel */ } | |
709 | }; | |
27743e0b | 710 | MODULE_DEVICE_TABLE(of, spi_imx_dt_ids); |
22a85e4c | 711 | |
6cdeb002 | 712 | static void spi_imx_chipselect(struct spi_device *spi, int is_active) |
b5f3294f | 713 | { |
6cdeb002 | 714 | struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); |
6cdeb002 | 715 | int gpio = spi_imx->chipselect[spi->chip_select]; |
e6a0a8bf UKK |
716 | int active = is_active != BITBANG_CS_INACTIVE; |
717 | int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH); | |
b5f3294f | 718 | |
8b17e055 | 719 | if (!gpio_is_valid(gpio)) |
b5f3294f | 720 | return; |
b5f3294f | 721 | |
e6a0a8bf | 722 | gpio_set_value(gpio, dev_is_lowactive ^ active); |
b5f3294f SH |
723 | } |
724 | ||
6cdeb002 | 725 | static void spi_imx_push(struct spi_imx_data *spi_imx) |
b5f3294f | 726 | { |
04ee5854 | 727 | while (spi_imx->txfifo < spi_imx_get_fifosize(spi_imx)) { |
6cdeb002 | 728 | if (!spi_imx->count) |
b5f3294f | 729 | break; |
6cdeb002 UKK |
730 | spi_imx->tx(spi_imx); |
731 | spi_imx->txfifo++; | |
b5f3294f SH |
732 | } |
733 | ||
edd501bb | 734 | spi_imx->devtype_data->trigger(spi_imx); |
b5f3294f SH |
735 | } |
736 | ||
6cdeb002 | 737 | static irqreturn_t spi_imx_isr(int irq, void *dev_id) |
b5f3294f | 738 | { |
6cdeb002 | 739 | struct spi_imx_data *spi_imx = dev_id; |
b5f3294f | 740 | |
edd501bb | 741 | while (spi_imx->devtype_data->rx_available(spi_imx)) { |
6cdeb002 UKK |
742 | spi_imx->rx(spi_imx); |
743 | spi_imx->txfifo--; | |
b5f3294f SH |
744 | } |
745 | ||
6cdeb002 UKK |
746 | if (spi_imx->count) { |
747 | spi_imx_push(spi_imx); | |
b5f3294f SH |
748 | return IRQ_HANDLED; |
749 | } | |
750 | ||
6cdeb002 | 751 | if (spi_imx->txfifo) { |
b5f3294f SH |
752 | /* No data left to push, but still waiting for rx data, |
753 | * enable receive data available interrupt. | |
754 | */ | |
edd501bb | 755 | spi_imx->devtype_data->intctrl( |
f4ba6315 | 756 | spi_imx, MXC_INT_RR); |
b5f3294f SH |
757 | return IRQ_HANDLED; |
758 | } | |
759 | ||
edd501bb | 760 | spi_imx->devtype_data->intctrl(spi_imx, 0); |
6cdeb002 | 761 | complete(&spi_imx->xfer_done); |
b5f3294f SH |
762 | |
763 | return IRQ_HANDLED; | |
764 | } | |
765 | ||
6cdeb002 | 766 | static int spi_imx_setupxfer(struct spi_device *spi, |
b5f3294f SH |
767 | struct spi_transfer *t) |
768 | { | |
6cdeb002 UKK |
769 | struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); |
770 | struct spi_imx_config config; | |
b5f3294f SH |
771 | |
772 | config.bpw = t ? t->bits_per_word : spi->bits_per_word; | |
773 | config.speed_hz = t ? t->speed_hz : spi->max_speed_hz; | |
774 | config.mode = spi->mode; | |
3b2aa89e | 775 | config.cs = spi->chip_select; |
b5f3294f | 776 | |
462d26b5 SH |
777 | if (!config.speed_hz) |
778 | config.speed_hz = spi->max_speed_hz; | |
779 | if (!config.bpw) | |
780 | config.bpw = spi->bits_per_word; | |
462d26b5 | 781 | |
e6a0a8bf UKK |
782 | /* Initialize the functions for transfer */ |
783 | if (config.bpw <= 8) { | |
784 | spi_imx->rx = spi_imx_buf_rx_u8; | |
785 | spi_imx->tx = spi_imx_buf_tx_u8; | |
786 | } else if (config.bpw <= 16) { | |
787 | spi_imx->rx = spi_imx_buf_rx_u16; | |
788 | spi_imx->tx = spi_imx_buf_tx_u16; | |
6051426f | 789 | } else { |
e6a0a8bf UKK |
790 | spi_imx->rx = spi_imx_buf_rx_u32; |
791 | spi_imx->tx = spi_imx_buf_tx_u32; | |
24778be2 | 792 | } |
e6a0a8bf | 793 | |
edd501bb | 794 | spi_imx->devtype_data->config(spi_imx, &config); |
b5f3294f SH |
795 | |
796 | return 0; | |
797 | } | |
798 | ||
f62caccd RG |
799 | static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx) |
800 | { | |
801 | struct spi_master *master = spi_imx->bitbang.master; | |
802 | ||
803 | if (master->dma_rx) { | |
804 | dma_release_channel(master->dma_rx); | |
805 | master->dma_rx = NULL; | |
806 | } | |
807 | ||
808 | if (master->dma_tx) { | |
809 | dma_release_channel(master->dma_tx); | |
810 | master->dma_tx = NULL; | |
811 | } | |
812 | ||
813 | spi_imx->dma_is_inited = 0; | |
814 | } | |
815 | ||
816 | static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx, | |
817 | struct spi_master *master, | |
818 | const struct resource *res) | |
819 | { | |
820 | struct dma_slave_config slave_config = {}; | |
821 | int ret; | |
822 | ||
a02bb401 RG |
823 | /* use pio mode for i.mx6dl chip TKT238285 */ |
824 | if (of_machine_is_compatible("fsl,imx6dl")) | |
825 | return 0; | |
826 | ||
f62caccd RG |
827 | /* Prepare for TX DMA: */ |
828 | master->dma_tx = dma_request_slave_channel(dev, "tx"); | |
829 | if (!master->dma_tx) { | |
830 | dev_err(dev, "cannot get the TX DMA channel!\n"); | |
831 | ret = -EINVAL; | |
832 | goto err; | |
833 | } | |
834 | ||
835 | slave_config.direction = DMA_MEM_TO_DEV; | |
836 | slave_config.dst_addr = res->start + MXC_CSPITXDATA; | |
837 | slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
838 | slave_config.dst_maxburst = spi_imx_get_fifosize(spi_imx) / 2; | |
839 | ret = dmaengine_slave_config(master->dma_tx, &slave_config); | |
840 | if (ret) { | |
841 | dev_err(dev, "error in TX dma configuration.\n"); | |
842 | goto err; | |
843 | } | |
844 | ||
845 | /* Prepare for RX : */ | |
846 | master->dma_rx = dma_request_slave_channel(dev, "rx"); | |
847 | if (!master->dma_rx) { | |
848 | dev_dbg(dev, "cannot get the DMA channel.\n"); | |
849 | ret = -EINVAL; | |
850 | goto err; | |
851 | } | |
852 | ||
853 | slave_config.direction = DMA_DEV_TO_MEM; | |
854 | slave_config.src_addr = res->start + MXC_CSPIRXDATA; | |
855 | slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
856 | slave_config.src_maxburst = spi_imx_get_fifosize(spi_imx) / 2; | |
857 | ret = dmaengine_slave_config(master->dma_rx, &slave_config); | |
858 | if (ret) { | |
859 | dev_err(dev, "error in RX dma configuration.\n"); | |
860 | goto err; | |
861 | } | |
862 | ||
863 | init_completion(&spi_imx->dma_rx_completion); | |
864 | init_completion(&spi_imx->dma_tx_completion); | |
865 | master->can_dma = spi_imx_can_dma; | |
866 | master->max_dma_len = MAX_SDMA_BD_BYTES; | |
867 | spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX | | |
868 | SPI_MASTER_MUST_TX; | |
f511ab09 LS |
869 | spi_imx->tx_wml = spi_imx_get_fifosize(spi_imx) / 2; |
870 | spi_imx->rx_wml = spi_imx_get_fifosize(spi_imx) / 2; | |
f62caccd RG |
871 | spi_imx->dma_is_inited = 1; |
872 | ||
873 | return 0; | |
874 | err: | |
875 | spi_imx_sdma_exit(spi_imx); | |
876 | return ret; | |
877 | } | |
878 | ||
879 | static void spi_imx_dma_rx_callback(void *cookie) | |
880 | { | |
881 | struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie; | |
882 | ||
883 | complete(&spi_imx->dma_rx_completion); | |
884 | } | |
885 | ||
886 | static void spi_imx_dma_tx_callback(void *cookie) | |
887 | { | |
888 | struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie; | |
889 | ||
890 | complete(&spi_imx->dma_tx_completion); | |
891 | } | |
892 | ||
893 | static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx, | |
894 | struct spi_transfer *transfer) | |
895 | { | |
896 | struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL; | |
897 | int ret; | |
56536a7f | 898 | unsigned long timeout; |
f62caccd RG |
899 | u32 dma; |
900 | int left; | |
901 | struct spi_master *master = spi_imx->bitbang.master; | |
902 | struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg; | |
903 | ||
904 | if (tx) { | |
905 | desc_tx = dmaengine_prep_slave_sg(master->dma_tx, | |
e8361f70 | 906 | tx->sgl, tx->nents, DMA_MEM_TO_DEV, |
f62caccd RG |
907 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
908 | if (!desc_tx) | |
909 | goto no_dma; | |
910 | ||
911 | desc_tx->callback = spi_imx_dma_tx_callback; | |
912 | desc_tx->callback_param = (void *)spi_imx; | |
913 | dmaengine_submit(desc_tx); | |
914 | } | |
915 | ||
916 | if (rx) { | |
917 | desc_rx = dmaengine_prep_slave_sg(master->dma_rx, | |
e8361f70 | 918 | rx->sgl, rx->nents, DMA_DEV_TO_MEM, |
f62caccd RG |
919 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
920 | if (!desc_rx) | |
921 | goto no_dma; | |
922 | ||
923 | desc_rx->callback = spi_imx_dma_rx_callback; | |
924 | desc_rx->callback_param = (void *)spi_imx; | |
925 | dmaengine_submit(desc_rx); | |
926 | } | |
927 | ||
928 | reinit_completion(&spi_imx->dma_rx_completion); | |
929 | reinit_completion(&spi_imx->dma_tx_completion); | |
930 | ||
931 | /* Trigger the cspi module. */ | |
932 | spi_imx->dma_finished = 0; | |
933 | ||
934 | dma = readl(spi_imx->base + MX51_ECSPI_DMA); | |
935 | dma = dma & (~MX51_ECSPI_DMA_RXT_WML_MASK); | |
936 | /* Change RX_DMA_LENGTH trigger dma fetch tail data */ | |
937 | left = transfer->len % spi_imx->rxt_wml; | |
938 | if (left) | |
939 | writel(dma | (left << MX51_ECSPI_DMA_RXT_WML_OFFSET), | |
940 | spi_imx->base + MX51_ECSPI_DMA); | |
941 | spi_imx->devtype_data->trigger(spi_imx); | |
942 | ||
943 | dma_async_issue_pending(master->dma_tx); | |
944 | dma_async_issue_pending(master->dma_rx); | |
945 | /* Wait SDMA to finish the data transfer.*/ | |
56536a7f | 946 | timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion, |
f62caccd | 947 | IMX_DMA_TIMEOUT); |
56536a7f | 948 | if (!timeout) { |
f62caccd RG |
949 | pr_warn("%s %s: I/O Error in DMA TX\n", |
950 | dev_driver_string(&master->dev), | |
951 | dev_name(&master->dev)); | |
952 | dmaengine_terminate_all(master->dma_tx); | |
953 | } else { | |
56536a7f NMG |
954 | timeout = wait_for_completion_timeout( |
955 | &spi_imx->dma_rx_completion, IMX_DMA_TIMEOUT); | |
956 | if (!timeout) { | |
f62caccd RG |
957 | pr_warn("%s %s: I/O Error in DMA RX\n", |
958 | dev_driver_string(&master->dev), | |
959 | dev_name(&master->dev)); | |
960 | spi_imx->devtype_data->reset(spi_imx); | |
961 | dmaengine_terminate_all(master->dma_rx); | |
962 | } | |
963 | writel(dma | | |
964 | spi_imx->rxt_wml << MX51_ECSPI_DMA_RXT_WML_OFFSET, | |
965 | spi_imx->base + MX51_ECSPI_DMA); | |
966 | } | |
967 | ||
968 | spi_imx->dma_finished = 1; | |
969 | spi_imx->devtype_data->trigger(spi_imx); | |
970 | ||
56536a7f | 971 | if (!timeout) |
f62caccd | 972 | ret = -ETIMEDOUT; |
56536a7f | 973 | else |
f62caccd RG |
974 | ret = transfer->len; |
975 | ||
976 | return ret; | |
977 | ||
978 | no_dma: | |
979 | pr_warn_once("%s %s: DMA not available, falling back to PIO\n", | |
980 | dev_driver_string(&master->dev), | |
981 | dev_name(&master->dev)); | |
982 | return -EAGAIN; | |
983 | } | |
984 | ||
985 | static int spi_imx_pio_transfer(struct spi_device *spi, | |
b5f3294f SH |
986 | struct spi_transfer *transfer) |
987 | { | |
6cdeb002 | 988 | struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); |
b5f3294f | 989 | |
6cdeb002 UKK |
990 | spi_imx->tx_buf = transfer->tx_buf; |
991 | spi_imx->rx_buf = transfer->rx_buf; | |
992 | spi_imx->count = transfer->len; | |
993 | spi_imx->txfifo = 0; | |
b5f3294f | 994 | |
aa0fe826 | 995 | reinit_completion(&spi_imx->xfer_done); |
b5f3294f | 996 | |
6cdeb002 | 997 | spi_imx_push(spi_imx); |
b5f3294f | 998 | |
edd501bb | 999 | spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE); |
b5f3294f | 1000 | |
6cdeb002 | 1001 | wait_for_completion(&spi_imx->xfer_done); |
b5f3294f SH |
1002 | |
1003 | return transfer->len; | |
1004 | } | |
1005 | ||
f62caccd RG |
1006 | static int spi_imx_transfer(struct spi_device *spi, |
1007 | struct spi_transfer *transfer) | |
1008 | { | |
1009 | int ret; | |
1010 | struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); | |
1011 | ||
1012 | if (spi_imx->bitbang.master->can_dma && | |
1013 | spi_imx_can_dma(spi_imx->bitbang.master, spi, transfer)) { | |
1014 | spi_imx->usedma = true; | |
1015 | ret = spi_imx_dma_transfer(spi_imx, transfer); | |
1016 | if (ret != -EAGAIN) | |
1017 | return ret; | |
1018 | } | |
1019 | spi_imx->usedma = false; | |
1020 | ||
1021 | return spi_imx_pio_transfer(spi, transfer); | |
1022 | } | |
1023 | ||
6cdeb002 | 1024 | static int spi_imx_setup(struct spi_device *spi) |
b5f3294f | 1025 | { |
6c23e5d4 SH |
1026 | struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); |
1027 | int gpio = spi_imx->chipselect[spi->chip_select]; | |
1028 | ||
f4d4ecfe | 1029 | dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__, |
b5f3294f SH |
1030 | spi->mode, spi->bits_per_word, spi->max_speed_hz); |
1031 | ||
8b17e055 | 1032 | if (gpio_is_valid(gpio)) |
6c23e5d4 SH |
1033 | gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH ? 0 : 1); |
1034 | ||
6cdeb002 | 1035 | spi_imx_chipselect(spi, BITBANG_CS_INACTIVE); |
b5f3294f SH |
1036 | |
1037 | return 0; | |
1038 | } | |
1039 | ||
6cdeb002 | 1040 | static void spi_imx_cleanup(struct spi_device *spi) |
b5f3294f SH |
1041 | { |
1042 | } | |
1043 | ||
9e556dcc HS |
1044 | static int |
1045 | spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg) | |
1046 | { | |
1047 | struct spi_imx_data *spi_imx = spi_master_get_devdata(master); | |
1048 | int ret; | |
1049 | ||
1050 | ret = clk_enable(spi_imx->clk_per); | |
1051 | if (ret) | |
1052 | return ret; | |
1053 | ||
1054 | ret = clk_enable(spi_imx->clk_ipg); | |
1055 | if (ret) { | |
1056 | clk_disable(spi_imx->clk_per); | |
1057 | return ret; | |
1058 | } | |
1059 | ||
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | static int | |
1064 | spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg) | |
1065 | { | |
1066 | struct spi_imx_data *spi_imx = spi_master_get_devdata(master); | |
1067 | ||
1068 | clk_disable(spi_imx->clk_ipg); | |
1069 | clk_disable(spi_imx->clk_per); | |
1070 | return 0; | |
1071 | } | |
1072 | ||
fd4a319b | 1073 | static int spi_imx_probe(struct platform_device *pdev) |
b5f3294f | 1074 | { |
22a85e4c SG |
1075 | struct device_node *np = pdev->dev.of_node; |
1076 | const struct of_device_id *of_id = | |
1077 | of_match_device(spi_imx_dt_ids, &pdev->dev); | |
1078 | struct spi_imx_master *mxc_platform_info = | |
1079 | dev_get_platdata(&pdev->dev); | |
b5f3294f | 1080 | struct spi_master *master; |
6cdeb002 | 1081 | struct spi_imx_data *spi_imx; |
b5f3294f | 1082 | struct resource *res; |
4b5d6aad | 1083 | int i, ret, num_cs, irq; |
b5f3294f | 1084 | |
22a85e4c | 1085 | if (!np && !mxc_platform_info) { |
b5f3294f SH |
1086 | dev_err(&pdev->dev, "can't get the platform data\n"); |
1087 | return -EINVAL; | |
1088 | } | |
1089 | ||
22a85e4c | 1090 | ret = of_property_read_u32(np, "fsl,spi-num-chipselects", &num_cs); |
39ec0d38 LW |
1091 | if (ret < 0) { |
1092 | if (mxc_platform_info) | |
1093 | num_cs = mxc_platform_info->num_chipselect; | |
1094 | else | |
1095 | return ret; | |
1096 | } | |
22a85e4c | 1097 | |
c2387cb9 SG |
1098 | master = spi_alloc_master(&pdev->dev, |
1099 | sizeof(struct spi_imx_data) + sizeof(int) * num_cs); | |
b5f3294f SH |
1100 | if (!master) |
1101 | return -ENOMEM; | |
1102 | ||
1103 | platform_set_drvdata(pdev, master); | |
1104 | ||
24778be2 | 1105 | master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32); |
b5f3294f | 1106 | master->bus_num = pdev->id; |
c2387cb9 | 1107 | master->num_chipselect = num_cs; |
b5f3294f | 1108 | |
6cdeb002 | 1109 | spi_imx = spi_master_get_devdata(master); |
94c69f76 | 1110 | spi_imx->bitbang.master = master; |
b5f3294f SH |
1111 | |
1112 | for (i = 0; i < master->num_chipselect; i++) { | |
22a85e4c | 1113 | int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); |
8b17e055 | 1114 | if (!gpio_is_valid(cs_gpio) && mxc_platform_info) |
22a85e4c | 1115 | cs_gpio = mxc_platform_info->chipselect[i]; |
4cc122ac FE |
1116 | |
1117 | spi_imx->chipselect[i] = cs_gpio; | |
8b17e055 | 1118 | if (!gpio_is_valid(cs_gpio)) |
b5f3294f | 1119 | continue; |
4cc122ac | 1120 | |
130b82c0 FE |
1121 | ret = devm_gpio_request(&pdev->dev, spi_imx->chipselect[i], |
1122 | DRIVER_NAME); | |
b5f3294f | 1123 | if (ret) { |
bbd050af | 1124 | dev_err(&pdev->dev, "can't get cs gpios\n"); |
130b82c0 | 1125 | goto out_master_put; |
b5f3294f | 1126 | } |
b5f3294f SH |
1127 | } |
1128 | ||
6cdeb002 UKK |
1129 | spi_imx->bitbang.chipselect = spi_imx_chipselect; |
1130 | spi_imx->bitbang.setup_transfer = spi_imx_setupxfer; | |
1131 | spi_imx->bitbang.txrx_bufs = spi_imx_transfer; | |
1132 | spi_imx->bitbang.master->setup = spi_imx_setup; | |
1133 | spi_imx->bitbang.master->cleanup = spi_imx_cleanup; | |
9e556dcc HS |
1134 | spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message; |
1135 | spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message; | |
3910f2cf | 1136 | spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; |
b5f3294f | 1137 | |
6cdeb002 | 1138 | init_completion(&spi_imx->xfer_done); |
b5f3294f | 1139 | |
22a85e4c | 1140 | spi_imx->devtype_data = of_id ? of_id->data : |
04ee5854 | 1141 | (struct spi_imx_devtype_data *) pdev->id_entry->driver_data; |
f4ba6315 | 1142 | |
b5f3294f | 1143 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
130b82c0 FE |
1144 | spi_imx->base = devm_ioremap_resource(&pdev->dev, res); |
1145 | if (IS_ERR(spi_imx->base)) { | |
1146 | ret = PTR_ERR(spi_imx->base); | |
1147 | goto out_master_put; | |
b5f3294f SH |
1148 | } |
1149 | ||
4b5d6aad FE |
1150 | irq = platform_get_irq(pdev, 0); |
1151 | if (irq < 0) { | |
1152 | ret = irq; | |
130b82c0 | 1153 | goto out_master_put; |
b5f3294f SH |
1154 | } |
1155 | ||
4b5d6aad | 1156 | ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0, |
8fc39b51 | 1157 | dev_name(&pdev->dev), spi_imx); |
b5f3294f | 1158 | if (ret) { |
4b5d6aad | 1159 | dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret); |
130b82c0 | 1160 | goto out_master_put; |
b5f3294f SH |
1161 | } |
1162 | ||
aa29d840 SH |
1163 | spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); |
1164 | if (IS_ERR(spi_imx->clk_ipg)) { | |
1165 | ret = PTR_ERR(spi_imx->clk_ipg); | |
130b82c0 | 1166 | goto out_master_put; |
b5f3294f SH |
1167 | } |
1168 | ||
aa29d840 SH |
1169 | spi_imx->clk_per = devm_clk_get(&pdev->dev, "per"); |
1170 | if (IS_ERR(spi_imx->clk_per)) { | |
1171 | ret = PTR_ERR(spi_imx->clk_per); | |
130b82c0 | 1172 | goto out_master_put; |
aa29d840 SH |
1173 | } |
1174 | ||
83174626 FE |
1175 | ret = clk_prepare_enable(spi_imx->clk_per); |
1176 | if (ret) | |
1177 | goto out_master_put; | |
1178 | ||
1179 | ret = clk_prepare_enable(spi_imx->clk_ipg); | |
1180 | if (ret) | |
1181 | goto out_put_per; | |
aa29d840 SH |
1182 | |
1183 | spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per); | |
f62caccd RG |
1184 | /* |
1185 | * Only validated on i.mx6 now, can remove the constrain if validated on | |
1186 | * other chips. | |
1187 | */ | |
1188 | if (spi_imx->devtype_data == &imx51_ecspi_devtype_data | |
1189 | && spi_imx_sdma_init(&pdev->dev, spi_imx, master, res)) | |
1190 | dev_err(&pdev->dev, "dma setup error,use pio instead\n"); | |
b5f3294f | 1191 | |
edd501bb | 1192 | spi_imx->devtype_data->reset(spi_imx); |
ce1807b2 | 1193 | |
edd501bb | 1194 | spi_imx->devtype_data->intctrl(spi_imx, 0); |
b5f3294f | 1195 | |
22a85e4c | 1196 | master->dev.of_node = pdev->dev.of_node; |
6cdeb002 | 1197 | ret = spi_bitbang_start(&spi_imx->bitbang); |
b5f3294f SH |
1198 | if (ret) { |
1199 | dev_err(&pdev->dev, "bitbang start failed with %d\n", ret); | |
1200 | goto out_clk_put; | |
1201 | } | |
1202 | ||
1203 | dev_info(&pdev->dev, "probed\n"); | |
1204 | ||
9e556dcc HS |
1205 | clk_disable(spi_imx->clk_ipg); |
1206 | clk_disable(spi_imx->clk_per); | |
b5f3294f SH |
1207 | return ret; |
1208 | ||
1209 | out_clk_put: | |
aa29d840 | 1210 | clk_disable_unprepare(spi_imx->clk_ipg); |
83174626 FE |
1211 | out_put_per: |
1212 | clk_disable_unprepare(spi_imx->clk_per); | |
130b82c0 | 1213 | out_master_put: |
b5f3294f | 1214 | spi_master_put(master); |
130b82c0 | 1215 | |
b5f3294f SH |
1216 | return ret; |
1217 | } | |
1218 | ||
fd4a319b | 1219 | static int spi_imx_remove(struct platform_device *pdev) |
b5f3294f SH |
1220 | { |
1221 | struct spi_master *master = platform_get_drvdata(pdev); | |
6cdeb002 | 1222 | struct spi_imx_data *spi_imx = spi_master_get_devdata(master); |
b5f3294f | 1223 | |
6cdeb002 | 1224 | spi_bitbang_stop(&spi_imx->bitbang); |
b5f3294f | 1225 | |
6cdeb002 | 1226 | writel(0, spi_imx->base + MXC_CSPICTRL); |
fd40dccb PDM |
1227 | clk_unprepare(spi_imx->clk_ipg); |
1228 | clk_unprepare(spi_imx->clk_per); | |
f62caccd | 1229 | spi_imx_sdma_exit(spi_imx); |
b5f3294f SH |
1230 | spi_master_put(master); |
1231 | ||
b5f3294f SH |
1232 | return 0; |
1233 | } | |
1234 | ||
6cdeb002 | 1235 | static struct platform_driver spi_imx_driver = { |
b5f3294f SH |
1236 | .driver = { |
1237 | .name = DRIVER_NAME, | |
22a85e4c | 1238 | .of_match_table = spi_imx_dt_ids, |
b5f3294f | 1239 | }, |
f4ba6315 | 1240 | .id_table = spi_imx_devtype, |
6cdeb002 | 1241 | .probe = spi_imx_probe, |
fd4a319b | 1242 | .remove = spi_imx_remove, |
b5f3294f | 1243 | }; |
940ab889 | 1244 | module_platform_driver(spi_imx_driver); |
b5f3294f SH |
1245 | |
1246 | MODULE_DESCRIPTION("SPI Master Controller driver"); | |
1247 | MODULE_AUTHOR("Sascha Hauer, Pengutronix"); | |
1248 | MODULE_LICENSE("GPL"); | |
3133fba3 | 1249 | MODULE_ALIAS("platform:" DRIVER_NAME); |