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e0c9905e SS |
1 | /* |
2 | * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs | |
a0d2642e | 3 | * Copyright (C) 2013, Intel Corporation |
e0c9905e SS |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | ||
20 | #include <linux/init.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/device.h> | |
23 | #include <linux/ioport.h> | |
24 | #include <linux/errno.h> | |
cbfd6a21 | 25 | #include <linux/err.h> |
e0c9905e SS |
26 | #include <linux/interrupt.h> |
27 | #include <linux/platform_device.h> | |
8348c259 | 28 | #include <linux/spi/pxa2xx_spi.h> |
e0c9905e SS |
29 | #include <linux/spi/spi.h> |
30 | #include <linux/workqueue.h> | |
e0c9905e | 31 | #include <linux/delay.h> |
a7bb3909 | 32 | #include <linux/gpio.h> |
5a0e3ad6 | 33 | #include <linux/slab.h> |
3343b7a6 | 34 | #include <linux/clk.h> |
7d94a505 | 35 | #include <linux/pm_runtime.h> |
a3496855 | 36 | #include <linux/acpi.h> |
e0c9905e SS |
37 | |
38 | #include <asm/io.h> | |
39 | #include <asm/irq.h> | |
e0c9905e | 40 | #include <asm/delay.h> |
e0c9905e | 41 | |
cd7bed00 | 42 | #include "spi-pxa2xx.h" |
e0c9905e SS |
43 | |
44 | MODULE_AUTHOR("Stephen Street"); | |
037cdafe | 45 | MODULE_DESCRIPTION("PXA2xx SSP SPI Controller"); |
e0c9905e | 46 | MODULE_LICENSE("GPL"); |
7e38c3c4 | 47 | MODULE_ALIAS("platform:pxa2xx-spi"); |
e0c9905e SS |
48 | |
49 | #define MAX_BUSES 3 | |
50 | ||
f1f640a9 VS |
51 | #define TIMOUT_DFLT 1000 |
52 | ||
b97c74bd NF |
53 | /* |
54 | * for testing SSCR1 changes that require SSP restart, basically | |
55 | * everything except the service and interrupt enables, the pxa270 developer | |
56 | * manual says only SSCR1_SCFR, SSCR1_SPH, SSCR1_SPO need to be in this | |
57 | * list, but the PXA255 dev man says all bits without really meaning the | |
58 | * service and interrupt enables | |
59 | */ | |
60 | #define SSCR1_CHANGE_MASK (SSCR1_TTELP | SSCR1_TTE | SSCR1_SCFR \ | |
8d94cc50 | 61 | | SSCR1_ECRA | SSCR1_ECRB | SSCR1_SCLKDIR \ |
b97c74bd NF |
62 | | SSCR1_SFRMDIR | SSCR1_RWOT | SSCR1_TRAIL \ |
63 | | SSCR1_IFS | SSCR1_STRF | SSCR1_EFWR \ | |
64 | | SSCR1_RFT | SSCR1_TFT | SSCR1_MWDS \ | |
65 | | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM) | |
8d94cc50 | 66 | |
a0d2642e MW |
67 | #define LPSS_RX_THRESH_DFLT 64 |
68 | #define LPSS_TX_LOTHRESH_DFLT 160 | |
69 | #define LPSS_TX_HITHRESH_DFLT 224 | |
70 | ||
71 | /* Offset from drv_data->lpss_base */ | |
1de70612 MW |
72 | #define GENERAL_REG 0x08 |
73 | #define GENERAL_REG_RXTO_HOLDOFF_DISABLE BIT(24) | |
0054e28d | 74 | #define SSP_REG 0x0c |
a0d2642e MW |
75 | #define SPI_CS_CONTROL 0x18 |
76 | #define SPI_CS_CONTROL_SW_MODE BIT(0) | |
77 | #define SPI_CS_CONTROL_CS_HIGH BIT(1) | |
78 | ||
79 | static bool is_lpss_ssp(const struct driver_data *drv_data) | |
80 | { | |
81 | return drv_data->ssp_type == LPSS_SSP; | |
82 | } | |
83 | ||
84 | /* | |
85 | * Read and write LPSS SSP private registers. Caller must first check that | |
86 | * is_lpss_ssp() returns true before these can be called. | |
87 | */ | |
88 | static u32 __lpss_ssp_read_priv(struct driver_data *drv_data, unsigned offset) | |
89 | { | |
90 | WARN_ON(!drv_data->lpss_base); | |
91 | return readl(drv_data->lpss_base + offset); | |
92 | } | |
93 | ||
94 | static void __lpss_ssp_write_priv(struct driver_data *drv_data, | |
95 | unsigned offset, u32 value) | |
96 | { | |
97 | WARN_ON(!drv_data->lpss_base); | |
98 | writel(value, drv_data->lpss_base + offset); | |
99 | } | |
100 | ||
101 | /* | |
102 | * lpss_ssp_setup - perform LPSS SSP specific setup | |
103 | * @drv_data: pointer to the driver private data | |
104 | * | |
105 | * Perform LPSS SSP specific setup. This function must be called first if | |
106 | * one is going to use LPSS SSP private registers. | |
107 | */ | |
108 | static void lpss_ssp_setup(struct driver_data *drv_data) | |
109 | { | |
110 | unsigned offset = 0x400; | |
111 | u32 value, orig; | |
112 | ||
113 | if (!is_lpss_ssp(drv_data)) | |
114 | return; | |
115 | ||
116 | /* | |
117 | * Perform auto-detection of the LPSS SSP private registers. They | |
118 | * can be either at 1k or 2k offset from the base address. | |
119 | */ | |
120 | orig = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL); | |
121 | ||
122 | value = orig | SPI_CS_CONTROL_SW_MODE; | |
123 | writel(value, drv_data->ioaddr + offset + SPI_CS_CONTROL); | |
124 | value = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL); | |
125 | if (value != (orig | SPI_CS_CONTROL_SW_MODE)) { | |
126 | offset = 0x800; | |
127 | goto detection_done; | |
128 | } | |
129 | ||
130 | value &= ~SPI_CS_CONTROL_SW_MODE; | |
131 | writel(value, drv_data->ioaddr + offset + SPI_CS_CONTROL); | |
132 | value = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL); | |
133 | if (value != orig) { | |
134 | offset = 0x800; | |
135 | goto detection_done; | |
136 | } | |
137 | ||
138 | detection_done: | |
139 | /* Now set the LPSS base */ | |
140 | drv_data->lpss_base = drv_data->ioaddr + offset; | |
141 | ||
142 | /* Enable software chip select control */ | |
143 | value = SPI_CS_CONTROL_SW_MODE | SPI_CS_CONTROL_CS_HIGH; | |
144 | __lpss_ssp_write_priv(drv_data, SPI_CS_CONTROL, value); | |
0054e28d MW |
145 | |
146 | /* Enable multiblock DMA transfers */ | |
1de70612 | 147 | if (drv_data->master_info->enable_dma) { |
0054e28d | 148 | __lpss_ssp_write_priv(drv_data, SSP_REG, 1); |
1de70612 MW |
149 | |
150 | value = __lpss_ssp_read_priv(drv_data, GENERAL_REG); | |
151 | value |= GENERAL_REG_RXTO_HOLDOFF_DISABLE; | |
152 | __lpss_ssp_write_priv(drv_data, GENERAL_REG, value); | |
153 | } | |
a0d2642e MW |
154 | } |
155 | ||
156 | static void lpss_ssp_cs_control(struct driver_data *drv_data, bool enable) | |
157 | { | |
158 | u32 value; | |
159 | ||
160 | if (!is_lpss_ssp(drv_data)) | |
161 | return; | |
162 | ||
163 | value = __lpss_ssp_read_priv(drv_data, SPI_CS_CONTROL); | |
164 | if (enable) | |
165 | value &= ~SPI_CS_CONTROL_CS_HIGH; | |
166 | else | |
167 | value |= SPI_CS_CONTROL_CS_HIGH; | |
168 | __lpss_ssp_write_priv(drv_data, SPI_CS_CONTROL, value); | |
169 | } | |
170 | ||
a7bb3909 EM |
171 | static void cs_assert(struct driver_data *drv_data) |
172 | { | |
173 | struct chip_data *chip = drv_data->cur_chip; | |
174 | ||
2a8626a9 SAS |
175 | if (drv_data->ssp_type == CE4100_SSP) { |
176 | write_SSSR(drv_data->cur_chip->frm, drv_data->ioaddr); | |
177 | return; | |
178 | } | |
179 | ||
a7bb3909 EM |
180 | if (chip->cs_control) { |
181 | chip->cs_control(PXA2XX_CS_ASSERT); | |
182 | return; | |
183 | } | |
184 | ||
a0d2642e | 185 | if (gpio_is_valid(chip->gpio_cs)) { |
a7bb3909 | 186 | gpio_set_value(chip->gpio_cs, chip->gpio_cs_inverted); |
a0d2642e MW |
187 | return; |
188 | } | |
189 | ||
190 | lpss_ssp_cs_control(drv_data, true); | |
a7bb3909 EM |
191 | } |
192 | ||
193 | static void cs_deassert(struct driver_data *drv_data) | |
194 | { | |
195 | struct chip_data *chip = drv_data->cur_chip; | |
196 | ||
2a8626a9 SAS |
197 | if (drv_data->ssp_type == CE4100_SSP) |
198 | return; | |
199 | ||
a7bb3909 | 200 | if (chip->cs_control) { |
2b2562d3 | 201 | chip->cs_control(PXA2XX_CS_DEASSERT); |
a7bb3909 EM |
202 | return; |
203 | } | |
204 | ||
a0d2642e | 205 | if (gpio_is_valid(chip->gpio_cs)) { |
a7bb3909 | 206 | gpio_set_value(chip->gpio_cs, !chip->gpio_cs_inverted); |
a0d2642e MW |
207 | return; |
208 | } | |
209 | ||
210 | lpss_ssp_cs_control(drv_data, false); | |
a7bb3909 EM |
211 | } |
212 | ||
cd7bed00 | 213 | int pxa2xx_spi_flush(struct driver_data *drv_data) |
e0c9905e SS |
214 | { |
215 | unsigned long limit = loops_per_jiffy << 1; | |
216 | ||
cf43369d | 217 | void __iomem *reg = drv_data->ioaddr; |
e0c9905e SS |
218 | |
219 | do { | |
220 | while (read_SSSR(reg) & SSSR_RNE) { | |
221 | read_SSDR(reg); | |
222 | } | |
306c68aa | 223 | } while ((read_SSSR(reg) & SSSR_BSY) && --limit); |
2a8626a9 | 224 | write_SSSR_CS(drv_data, SSSR_ROR); |
e0c9905e SS |
225 | |
226 | return limit; | |
227 | } | |
228 | ||
8d94cc50 | 229 | static int null_writer(struct driver_data *drv_data) |
e0c9905e | 230 | { |
cf43369d | 231 | void __iomem *reg = drv_data->ioaddr; |
9708c121 | 232 | u8 n_bytes = drv_data->n_bytes; |
e0c9905e | 233 | |
4a25605f | 234 | if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK) |
8d94cc50 SS |
235 | || (drv_data->tx == drv_data->tx_end)) |
236 | return 0; | |
237 | ||
238 | write_SSDR(0, reg); | |
239 | drv_data->tx += n_bytes; | |
240 | ||
241 | return 1; | |
e0c9905e SS |
242 | } |
243 | ||
8d94cc50 | 244 | static int null_reader(struct driver_data *drv_data) |
e0c9905e | 245 | { |
cf43369d | 246 | void __iomem *reg = drv_data->ioaddr; |
9708c121 | 247 | u8 n_bytes = drv_data->n_bytes; |
e0c9905e SS |
248 | |
249 | while ((read_SSSR(reg) & SSSR_RNE) | |
8d94cc50 | 250 | && (drv_data->rx < drv_data->rx_end)) { |
e0c9905e SS |
251 | read_SSDR(reg); |
252 | drv_data->rx += n_bytes; | |
253 | } | |
8d94cc50 SS |
254 | |
255 | return drv_data->rx == drv_data->rx_end; | |
e0c9905e SS |
256 | } |
257 | ||
8d94cc50 | 258 | static int u8_writer(struct driver_data *drv_data) |
e0c9905e | 259 | { |
cf43369d | 260 | void __iomem *reg = drv_data->ioaddr; |
e0c9905e | 261 | |
4a25605f | 262 | if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK) |
8d94cc50 SS |
263 | || (drv_data->tx == drv_data->tx_end)) |
264 | return 0; | |
265 | ||
266 | write_SSDR(*(u8 *)(drv_data->tx), reg); | |
267 | ++drv_data->tx; | |
268 | ||
269 | return 1; | |
e0c9905e SS |
270 | } |
271 | ||
8d94cc50 | 272 | static int u8_reader(struct driver_data *drv_data) |
e0c9905e | 273 | { |
cf43369d | 274 | void __iomem *reg = drv_data->ioaddr; |
e0c9905e SS |
275 | |
276 | while ((read_SSSR(reg) & SSSR_RNE) | |
8d94cc50 | 277 | && (drv_data->rx < drv_data->rx_end)) { |
e0c9905e SS |
278 | *(u8 *)(drv_data->rx) = read_SSDR(reg); |
279 | ++drv_data->rx; | |
280 | } | |
8d94cc50 SS |
281 | |
282 | return drv_data->rx == drv_data->rx_end; | |
e0c9905e SS |
283 | } |
284 | ||
8d94cc50 | 285 | static int u16_writer(struct driver_data *drv_data) |
e0c9905e | 286 | { |
cf43369d | 287 | void __iomem *reg = drv_data->ioaddr; |
e0c9905e | 288 | |
4a25605f | 289 | if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK) |
8d94cc50 SS |
290 | || (drv_data->tx == drv_data->tx_end)) |
291 | return 0; | |
292 | ||
293 | write_SSDR(*(u16 *)(drv_data->tx), reg); | |
294 | drv_data->tx += 2; | |
295 | ||
296 | return 1; | |
e0c9905e SS |
297 | } |
298 | ||
8d94cc50 | 299 | static int u16_reader(struct driver_data *drv_data) |
e0c9905e | 300 | { |
cf43369d | 301 | void __iomem *reg = drv_data->ioaddr; |
e0c9905e SS |
302 | |
303 | while ((read_SSSR(reg) & SSSR_RNE) | |
8d94cc50 | 304 | && (drv_data->rx < drv_data->rx_end)) { |
e0c9905e SS |
305 | *(u16 *)(drv_data->rx) = read_SSDR(reg); |
306 | drv_data->rx += 2; | |
307 | } | |
8d94cc50 SS |
308 | |
309 | return drv_data->rx == drv_data->rx_end; | |
e0c9905e | 310 | } |
8d94cc50 SS |
311 | |
312 | static int u32_writer(struct driver_data *drv_data) | |
e0c9905e | 313 | { |
cf43369d | 314 | void __iomem *reg = drv_data->ioaddr; |
e0c9905e | 315 | |
4a25605f | 316 | if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK) |
8d94cc50 SS |
317 | || (drv_data->tx == drv_data->tx_end)) |
318 | return 0; | |
319 | ||
320 | write_SSDR(*(u32 *)(drv_data->tx), reg); | |
321 | drv_data->tx += 4; | |
322 | ||
323 | return 1; | |
e0c9905e SS |
324 | } |
325 | ||
8d94cc50 | 326 | static int u32_reader(struct driver_data *drv_data) |
e0c9905e | 327 | { |
cf43369d | 328 | void __iomem *reg = drv_data->ioaddr; |
e0c9905e SS |
329 | |
330 | while ((read_SSSR(reg) & SSSR_RNE) | |
8d94cc50 | 331 | && (drv_data->rx < drv_data->rx_end)) { |
e0c9905e SS |
332 | *(u32 *)(drv_data->rx) = read_SSDR(reg); |
333 | drv_data->rx += 4; | |
334 | } | |
8d94cc50 SS |
335 | |
336 | return drv_data->rx == drv_data->rx_end; | |
e0c9905e SS |
337 | } |
338 | ||
cd7bed00 | 339 | void *pxa2xx_spi_next_transfer(struct driver_data *drv_data) |
e0c9905e SS |
340 | { |
341 | struct spi_message *msg = drv_data->cur_msg; | |
342 | struct spi_transfer *trans = drv_data->cur_transfer; | |
343 | ||
344 | /* Move to next transfer */ | |
345 | if (trans->transfer_list.next != &msg->transfers) { | |
346 | drv_data->cur_transfer = | |
347 | list_entry(trans->transfer_list.next, | |
348 | struct spi_transfer, | |
349 | transfer_list); | |
350 | return RUNNING_STATE; | |
351 | } else | |
352 | return DONE_STATE; | |
353 | } | |
354 | ||
e0c9905e | 355 | /* caller already set message->status; dma and pio irqs are blocked */ |
5daa3ba0 | 356 | static void giveback(struct driver_data *drv_data) |
e0c9905e SS |
357 | { |
358 | struct spi_transfer* last_transfer; | |
5daa3ba0 | 359 | struct spi_message *msg; |
e0c9905e | 360 | |
5daa3ba0 SS |
361 | msg = drv_data->cur_msg; |
362 | drv_data->cur_msg = NULL; | |
363 | drv_data->cur_transfer = NULL; | |
5daa3ba0 SS |
364 | |
365 | last_transfer = list_entry(msg->transfers.prev, | |
e0c9905e SS |
366 | struct spi_transfer, |
367 | transfer_list); | |
368 | ||
8423597d NF |
369 | /* Delay if requested before any change in chip select */ |
370 | if (last_transfer->delay_usecs) | |
371 | udelay(last_transfer->delay_usecs); | |
372 | ||
373 | /* Drop chip select UNLESS cs_change is true or we are returning | |
374 | * a message with an error, or next message is for another chip | |
375 | */ | |
e0c9905e | 376 | if (!last_transfer->cs_change) |
a7bb3909 | 377 | cs_deassert(drv_data); |
8423597d NF |
378 | else { |
379 | struct spi_message *next_msg; | |
380 | ||
381 | /* Holding of cs was hinted, but we need to make sure | |
382 | * the next message is for the same chip. Don't waste | |
383 | * time with the following tests unless this was hinted. | |
384 | * | |
385 | * We cannot postpone this until pump_messages, because | |
386 | * after calling msg->complete (below) the driver that | |
387 | * sent the current message could be unloaded, which | |
388 | * could invalidate the cs_control() callback... | |
389 | */ | |
390 | ||
391 | /* get a pointer to the next message, if any */ | |
7f86bde9 | 392 | next_msg = spi_get_next_queued_message(drv_data->master); |
8423597d NF |
393 | |
394 | /* see if the next and current messages point | |
395 | * to the same chip | |
396 | */ | |
397 | if (next_msg && next_msg->spi != msg->spi) | |
398 | next_msg = NULL; | |
399 | if (!next_msg || msg->state == ERROR_STATE) | |
a7bb3909 | 400 | cs_deassert(drv_data); |
8423597d | 401 | } |
e0c9905e | 402 | |
7f86bde9 | 403 | spi_finalize_current_message(drv_data->master); |
a7bb3909 | 404 | drv_data->cur_chip = NULL; |
e0c9905e SS |
405 | } |
406 | ||
579d3bb2 SAS |
407 | static void reset_sccr1(struct driver_data *drv_data) |
408 | { | |
409 | void __iomem *reg = drv_data->ioaddr; | |
410 | struct chip_data *chip = drv_data->cur_chip; | |
411 | u32 sccr1_reg; | |
412 | ||
413 | sccr1_reg = read_SSCR1(reg) & ~drv_data->int_cr1; | |
414 | sccr1_reg &= ~SSCR1_RFT; | |
415 | sccr1_reg |= chip->threshold; | |
416 | write_SSCR1(sccr1_reg, reg); | |
417 | } | |
418 | ||
8d94cc50 | 419 | static void int_error_stop(struct driver_data *drv_data, const char* msg) |
e0c9905e | 420 | { |
cf43369d | 421 | void __iomem *reg = drv_data->ioaddr; |
e0c9905e | 422 | |
8d94cc50 | 423 | /* Stop and reset SSP */ |
2a8626a9 | 424 | write_SSSR_CS(drv_data, drv_data->clear_sr); |
579d3bb2 | 425 | reset_sccr1(drv_data); |
2a8626a9 | 426 | if (!pxa25x_ssp_comp(drv_data)) |
8d94cc50 | 427 | write_SSTO(0, reg); |
cd7bed00 | 428 | pxa2xx_spi_flush(drv_data); |
8d94cc50 | 429 | write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg); |
e0c9905e | 430 | |
8d94cc50 | 431 | dev_err(&drv_data->pdev->dev, "%s\n", msg); |
e0c9905e | 432 | |
8d94cc50 SS |
433 | drv_data->cur_msg->state = ERROR_STATE; |
434 | tasklet_schedule(&drv_data->pump_transfers); | |
435 | } | |
5daa3ba0 | 436 | |
8d94cc50 SS |
437 | static void int_transfer_complete(struct driver_data *drv_data) |
438 | { | |
cf43369d | 439 | void __iomem *reg = drv_data->ioaddr; |
e0c9905e | 440 | |
8d94cc50 | 441 | /* Stop SSP */ |
2a8626a9 | 442 | write_SSSR_CS(drv_data, drv_data->clear_sr); |
579d3bb2 | 443 | reset_sccr1(drv_data); |
2a8626a9 | 444 | if (!pxa25x_ssp_comp(drv_data)) |
8d94cc50 | 445 | write_SSTO(0, reg); |
e0c9905e | 446 | |
25985edc | 447 | /* Update total byte transferred return count actual bytes read */ |
8d94cc50 SS |
448 | drv_data->cur_msg->actual_length += drv_data->len - |
449 | (drv_data->rx_end - drv_data->rx); | |
e0c9905e | 450 | |
8423597d NF |
451 | /* Transfer delays and chip select release are |
452 | * handled in pump_transfers or giveback | |
453 | */ | |
e0c9905e | 454 | |
8d94cc50 | 455 | /* Move to next transfer */ |
cd7bed00 | 456 | drv_data->cur_msg->state = pxa2xx_spi_next_transfer(drv_data); |
e0c9905e | 457 | |
8d94cc50 SS |
458 | /* Schedule transfer tasklet */ |
459 | tasklet_schedule(&drv_data->pump_transfers); | |
460 | } | |
e0c9905e | 461 | |
8d94cc50 SS |
462 | static irqreturn_t interrupt_transfer(struct driver_data *drv_data) |
463 | { | |
cf43369d | 464 | void __iomem *reg = drv_data->ioaddr; |
e0c9905e | 465 | |
8d94cc50 SS |
466 | u32 irq_mask = (read_SSCR1(reg) & SSCR1_TIE) ? |
467 | drv_data->mask_sr : drv_data->mask_sr & ~SSSR_TFS; | |
e0c9905e | 468 | |
8d94cc50 | 469 | u32 irq_status = read_SSSR(reg) & irq_mask; |
e0c9905e | 470 | |
8d94cc50 SS |
471 | if (irq_status & SSSR_ROR) { |
472 | int_error_stop(drv_data, "interrupt_transfer: fifo overrun"); | |
473 | return IRQ_HANDLED; | |
474 | } | |
e0c9905e | 475 | |
8d94cc50 SS |
476 | if (irq_status & SSSR_TINT) { |
477 | write_SSSR(SSSR_TINT, reg); | |
478 | if (drv_data->read(drv_data)) { | |
479 | int_transfer_complete(drv_data); | |
480 | return IRQ_HANDLED; | |
481 | } | |
482 | } | |
e0c9905e | 483 | |
8d94cc50 SS |
484 | /* Drain rx fifo, Fill tx fifo and prevent overruns */ |
485 | do { | |
486 | if (drv_data->read(drv_data)) { | |
487 | int_transfer_complete(drv_data); | |
488 | return IRQ_HANDLED; | |
489 | } | |
490 | } while (drv_data->write(drv_data)); | |
e0c9905e | 491 | |
8d94cc50 SS |
492 | if (drv_data->read(drv_data)) { |
493 | int_transfer_complete(drv_data); | |
494 | return IRQ_HANDLED; | |
495 | } | |
e0c9905e | 496 | |
8d94cc50 | 497 | if (drv_data->tx == drv_data->tx_end) { |
579d3bb2 SAS |
498 | u32 bytes_left; |
499 | u32 sccr1_reg; | |
500 | ||
501 | sccr1_reg = read_SSCR1(reg); | |
502 | sccr1_reg &= ~SSCR1_TIE; | |
503 | ||
504 | /* | |
505 | * PXA25x_SSP has no timeout, set up rx threshould for the | |
25985edc | 506 | * remaining RX bytes. |
579d3bb2 | 507 | */ |
2a8626a9 | 508 | if (pxa25x_ssp_comp(drv_data)) { |
579d3bb2 SAS |
509 | |
510 | sccr1_reg &= ~SSCR1_RFT; | |
511 | ||
512 | bytes_left = drv_data->rx_end - drv_data->rx; | |
513 | switch (drv_data->n_bytes) { | |
514 | case 4: | |
515 | bytes_left >>= 1; | |
516 | case 2: | |
517 | bytes_left >>= 1; | |
8d94cc50 | 518 | } |
579d3bb2 SAS |
519 | |
520 | if (bytes_left > RX_THRESH_DFLT) | |
521 | bytes_left = RX_THRESH_DFLT; | |
522 | ||
523 | sccr1_reg |= SSCR1_RxTresh(bytes_left); | |
e0c9905e | 524 | } |
579d3bb2 | 525 | write_SSCR1(sccr1_reg, reg); |
e0c9905e SS |
526 | } |
527 | ||
5daa3ba0 SS |
528 | /* We did something */ |
529 | return IRQ_HANDLED; | |
e0c9905e SS |
530 | } |
531 | ||
7d12e780 | 532 | static irqreturn_t ssp_int(int irq, void *dev_id) |
e0c9905e | 533 | { |
c7bec5ab | 534 | struct driver_data *drv_data = dev_id; |
cf43369d | 535 | void __iomem *reg = drv_data->ioaddr; |
7d94a505 | 536 | u32 sccr1_reg; |
49cbb1e0 SAS |
537 | u32 mask = drv_data->mask_sr; |
538 | u32 status; | |
539 | ||
7d94a505 MW |
540 | /* |
541 | * The IRQ might be shared with other peripherals so we must first | |
542 | * check that are we RPM suspended or not. If we are we assume that | |
543 | * the IRQ was not for us (we shouldn't be RPM suspended when the | |
544 | * interrupt is enabled). | |
545 | */ | |
546 | if (pm_runtime_suspended(&drv_data->pdev->dev)) | |
547 | return IRQ_NONE; | |
548 | ||
549 | sccr1_reg = read_SSCR1(reg); | |
49cbb1e0 SAS |
550 | status = read_SSSR(reg); |
551 | ||
552 | /* Ignore possible writes if we don't need to write */ | |
553 | if (!(sccr1_reg & SSCR1_TIE)) | |
554 | mask &= ~SSSR_TFS; | |
555 | ||
556 | if (!(status & mask)) | |
557 | return IRQ_NONE; | |
e0c9905e SS |
558 | |
559 | if (!drv_data->cur_msg) { | |
5daa3ba0 SS |
560 | |
561 | write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg); | |
562 | write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg); | |
2a8626a9 | 563 | if (!pxa25x_ssp_comp(drv_data)) |
5daa3ba0 | 564 | write_SSTO(0, reg); |
2a8626a9 | 565 | write_SSSR_CS(drv_data, drv_data->clear_sr); |
5daa3ba0 | 566 | |
e0c9905e | 567 | dev_err(&drv_data->pdev->dev, "bad message state " |
8d94cc50 | 568 | "in interrupt handler\n"); |
5daa3ba0 | 569 | |
e0c9905e SS |
570 | /* Never fail */ |
571 | return IRQ_HANDLED; | |
572 | } | |
573 | ||
574 | return drv_data->transfer_handler(drv_data); | |
575 | } | |
576 | ||
3343b7a6 | 577 | static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate) |
2f1a74e5 | 578 | { |
3343b7a6 MW |
579 | unsigned long ssp_clk = drv_data->max_clk_rate; |
580 | const struct ssp_device *ssp = drv_data->ssp; | |
581 | ||
582 | rate = min_t(int, ssp_clk, rate); | |
2f1a74e5 | 583 | |
2a8626a9 | 584 | if (ssp->type == PXA25x_SSP || ssp->type == CE4100_SSP) |
2f1a74e5 | 585 | return ((ssp_clk / (2 * rate) - 1) & 0xff) << 8; |
586 | else | |
587 | return ((ssp_clk / rate - 1) & 0xfff) << 8; | |
588 | } | |
589 | ||
e0c9905e SS |
590 | static void pump_transfers(unsigned long data) |
591 | { | |
592 | struct driver_data *drv_data = (struct driver_data *)data; | |
593 | struct spi_message *message = NULL; | |
594 | struct spi_transfer *transfer = NULL; | |
595 | struct spi_transfer *previous = NULL; | |
596 | struct chip_data *chip = NULL; | |
cf43369d | 597 | void __iomem *reg = drv_data->ioaddr; |
9708c121 SS |
598 | u32 clk_div = 0; |
599 | u8 bits = 0; | |
600 | u32 speed = 0; | |
601 | u32 cr0; | |
8d94cc50 SS |
602 | u32 cr1; |
603 | u32 dma_thresh = drv_data->cur_chip->dma_threshold; | |
604 | u32 dma_burst = drv_data->cur_chip->dma_burst_size; | |
e0c9905e SS |
605 | |
606 | /* Get current state information */ | |
607 | message = drv_data->cur_msg; | |
608 | transfer = drv_data->cur_transfer; | |
609 | chip = drv_data->cur_chip; | |
610 | ||
611 | /* Handle for abort */ | |
612 | if (message->state == ERROR_STATE) { | |
613 | message->status = -EIO; | |
5daa3ba0 | 614 | giveback(drv_data); |
e0c9905e SS |
615 | return; |
616 | } | |
617 | ||
618 | /* Handle end of message */ | |
619 | if (message->state == DONE_STATE) { | |
620 | message->status = 0; | |
5daa3ba0 | 621 | giveback(drv_data); |
e0c9905e SS |
622 | return; |
623 | } | |
624 | ||
8423597d | 625 | /* Delay if requested at end of transfer before CS change */ |
e0c9905e SS |
626 | if (message->state == RUNNING_STATE) { |
627 | previous = list_entry(transfer->transfer_list.prev, | |
628 | struct spi_transfer, | |
629 | transfer_list); | |
630 | if (previous->delay_usecs) | |
631 | udelay(previous->delay_usecs); | |
8423597d NF |
632 | |
633 | /* Drop chip select only if cs_change is requested */ | |
634 | if (previous->cs_change) | |
a7bb3909 | 635 | cs_deassert(drv_data); |
e0c9905e SS |
636 | } |
637 | ||
cd7bed00 MW |
638 | /* Check if we can DMA this transfer */ |
639 | if (!pxa2xx_spi_dma_is_possible(transfer->len) && chip->enable_dma) { | |
7e964455 NF |
640 | |
641 | /* reject already-mapped transfers; PIO won't always work */ | |
642 | if (message->is_dma_mapped | |
643 | || transfer->rx_dma || transfer->tx_dma) { | |
644 | dev_err(&drv_data->pdev->dev, | |
645 | "pump_transfers: mapped transfer length " | |
20b918dc | 646 | "of %u is greater than %d\n", |
7e964455 NF |
647 | transfer->len, MAX_DMA_LEN); |
648 | message->status = -EINVAL; | |
649 | giveback(drv_data); | |
650 | return; | |
651 | } | |
652 | ||
653 | /* warn ... we force this to PIO mode */ | |
654 | if (printk_ratelimit()) | |
655 | dev_warn(&message->spi->dev, "pump_transfers: " | |
656 | "DMA disabled for transfer length %ld " | |
657 | "greater than %d\n", | |
658 | (long)drv_data->len, MAX_DMA_LEN); | |
8d94cc50 SS |
659 | } |
660 | ||
e0c9905e | 661 | /* Setup the transfer state based on the type of transfer */ |
cd7bed00 | 662 | if (pxa2xx_spi_flush(drv_data) == 0) { |
e0c9905e SS |
663 | dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n"); |
664 | message->status = -EIO; | |
5daa3ba0 | 665 | giveback(drv_data); |
e0c9905e SS |
666 | return; |
667 | } | |
9708c121 | 668 | drv_data->n_bytes = chip->n_bytes; |
e0c9905e SS |
669 | drv_data->tx = (void *)transfer->tx_buf; |
670 | drv_data->tx_end = drv_data->tx + transfer->len; | |
671 | drv_data->rx = transfer->rx_buf; | |
672 | drv_data->rx_end = drv_data->rx + transfer->len; | |
673 | drv_data->rx_dma = transfer->rx_dma; | |
674 | drv_data->tx_dma = transfer->tx_dma; | |
cd7bed00 | 675 | drv_data->len = transfer->len; |
e0c9905e SS |
676 | drv_data->write = drv_data->tx ? chip->write : null_writer; |
677 | drv_data->read = drv_data->rx ? chip->read : null_reader; | |
9708c121 SS |
678 | |
679 | /* Change speed and bit per word on a per transfer */ | |
8d94cc50 | 680 | cr0 = chip->cr0; |
9708c121 SS |
681 | if (transfer->speed_hz || transfer->bits_per_word) { |
682 | ||
9708c121 SS |
683 | bits = chip->bits_per_word; |
684 | speed = chip->speed_hz; | |
685 | ||
686 | if (transfer->speed_hz) | |
687 | speed = transfer->speed_hz; | |
688 | ||
689 | if (transfer->bits_per_word) | |
690 | bits = transfer->bits_per_word; | |
691 | ||
3343b7a6 | 692 | clk_div = ssp_get_clk_div(drv_data, speed); |
9708c121 SS |
693 | |
694 | if (bits <= 8) { | |
695 | drv_data->n_bytes = 1; | |
9708c121 SS |
696 | drv_data->read = drv_data->read != null_reader ? |
697 | u8_reader : null_reader; | |
698 | drv_data->write = drv_data->write != null_writer ? | |
699 | u8_writer : null_writer; | |
700 | } else if (bits <= 16) { | |
701 | drv_data->n_bytes = 2; | |
9708c121 SS |
702 | drv_data->read = drv_data->read != null_reader ? |
703 | u16_reader : null_reader; | |
704 | drv_data->write = drv_data->write != null_writer ? | |
705 | u16_writer : null_writer; | |
706 | } else if (bits <= 32) { | |
707 | drv_data->n_bytes = 4; | |
9708c121 SS |
708 | drv_data->read = drv_data->read != null_reader ? |
709 | u32_reader : null_reader; | |
710 | drv_data->write = drv_data->write != null_writer ? | |
711 | u32_writer : null_writer; | |
712 | } | |
8d94cc50 SS |
713 | /* if bits/word is changed in dma mode, then must check the |
714 | * thresholds and burst also */ | |
715 | if (chip->enable_dma) { | |
cd7bed00 MW |
716 | if (pxa2xx_spi_set_dma_burst_and_threshold(chip, |
717 | message->spi, | |
8d94cc50 SS |
718 | bits, &dma_burst, |
719 | &dma_thresh)) | |
720 | if (printk_ratelimit()) | |
721 | dev_warn(&message->spi->dev, | |
7e964455 | 722 | "pump_transfers: " |
8d94cc50 SS |
723 | "DMA burst size reduced to " |
724 | "match bits_per_word\n"); | |
725 | } | |
9708c121 SS |
726 | |
727 | cr0 = clk_div | |
728 | | SSCR0_Motorola | |
5daa3ba0 | 729 | | SSCR0_DataSize(bits > 16 ? bits - 16 : bits) |
9708c121 SS |
730 | | SSCR0_SSE |
731 | | (bits > 16 ? SSCR0_EDSS : 0); | |
9708c121 SS |
732 | } |
733 | ||
e0c9905e SS |
734 | message->state = RUNNING_STATE; |
735 | ||
7e964455 | 736 | drv_data->dma_mapped = 0; |
cd7bed00 MW |
737 | if (pxa2xx_spi_dma_is_possible(drv_data->len)) |
738 | drv_data->dma_mapped = pxa2xx_spi_map_dma_buffers(drv_data); | |
7e964455 | 739 | if (drv_data->dma_mapped) { |
e0c9905e SS |
740 | |
741 | /* Ensure we have the correct interrupt handler */ | |
cd7bed00 MW |
742 | drv_data->transfer_handler = pxa2xx_spi_dma_transfer; |
743 | ||
744 | pxa2xx_spi_dma_prepare(drv_data, dma_burst); | |
e0c9905e | 745 | |
8d94cc50 SS |
746 | /* Clear status and start DMA engine */ |
747 | cr1 = chip->cr1 | dma_thresh | drv_data->dma_cr1; | |
e0c9905e | 748 | write_SSSR(drv_data->clear_sr, reg); |
cd7bed00 MW |
749 | |
750 | pxa2xx_spi_dma_start(drv_data); | |
e0c9905e SS |
751 | } else { |
752 | /* Ensure we have the correct interrupt handler */ | |
753 | drv_data->transfer_handler = interrupt_transfer; | |
754 | ||
8d94cc50 SS |
755 | /* Clear status */ |
756 | cr1 = chip->cr1 | chip->threshold | drv_data->int_cr1; | |
2a8626a9 | 757 | write_SSSR_CS(drv_data, drv_data->clear_sr); |
8d94cc50 SS |
758 | } |
759 | ||
a0d2642e MW |
760 | if (is_lpss_ssp(drv_data)) { |
761 | if ((read_SSIRF(reg) & 0xff) != chip->lpss_rx_threshold) | |
762 | write_SSIRF(chip->lpss_rx_threshold, reg); | |
763 | if ((read_SSITF(reg) & 0xffff) != chip->lpss_tx_threshold) | |
764 | write_SSITF(chip->lpss_tx_threshold, reg); | |
765 | } | |
766 | ||
8d94cc50 SS |
767 | /* see if we need to reload the config registers */ |
768 | if ((read_SSCR0(reg) != cr0) | |
769 | || (read_SSCR1(reg) & SSCR1_CHANGE_MASK) != | |
770 | (cr1 & SSCR1_CHANGE_MASK)) { | |
771 | ||
b97c74bd | 772 | /* stop the SSP, and update the other bits */ |
8d94cc50 | 773 | write_SSCR0(cr0 & ~SSCR0_SSE, reg); |
2a8626a9 | 774 | if (!pxa25x_ssp_comp(drv_data)) |
e0c9905e | 775 | write_SSTO(chip->timeout, reg); |
b97c74bd NF |
776 | /* first set CR1 without interrupt and service enables */ |
777 | write_SSCR1(cr1 & SSCR1_CHANGE_MASK, reg); | |
778 | /* restart the SSP */ | |
8d94cc50 | 779 | write_SSCR0(cr0, reg); |
b97c74bd | 780 | |
8d94cc50 | 781 | } else { |
2a8626a9 | 782 | if (!pxa25x_ssp_comp(drv_data)) |
8d94cc50 | 783 | write_SSTO(chip->timeout, reg); |
e0c9905e | 784 | } |
b97c74bd | 785 | |
a7bb3909 | 786 | cs_assert(drv_data); |
b97c74bd NF |
787 | |
788 | /* after chip select, release the data by enabling service | |
789 | * requests and interrupts, without changing any mode bits */ | |
790 | write_SSCR1(cr1, reg); | |
e0c9905e SS |
791 | } |
792 | ||
7f86bde9 MW |
793 | static int pxa2xx_spi_transfer_one_message(struct spi_master *master, |
794 | struct spi_message *msg) | |
e0c9905e | 795 | { |
7f86bde9 | 796 | struct driver_data *drv_data = spi_master_get_devdata(master); |
e0c9905e | 797 | |
7f86bde9 | 798 | drv_data->cur_msg = msg; |
e0c9905e SS |
799 | /* Initial message state*/ |
800 | drv_data->cur_msg->state = START_STATE; | |
801 | drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next, | |
802 | struct spi_transfer, | |
803 | transfer_list); | |
804 | ||
8d94cc50 SS |
805 | /* prepare to setup the SSP, in pump_transfers, using the per |
806 | * chip configuration */ | |
e0c9905e | 807 | drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi); |
e0c9905e SS |
808 | |
809 | /* Mark as busy and launch transfers */ | |
810 | tasklet_schedule(&drv_data->pump_transfers); | |
e0c9905e SS |
811 | return 0; |
812 | } | |
813 | ||
7d94a505 MW |
814 | static int pxa2xx_spi_unprepare_transfer(struct spi_master *master) |
815 | { | |
816 | struct driver_data *drv_data = spi_master_get_devdata(master); | |
817 | ||
818 | /* Disable the SSP now */ | |
819 | write_SSCR0(read_SSCR0(drv_data->ioaddr) & ~SSCR0_SSE, | |
820 | drv_data->ioaddr); | |
821 | ||
7d94a505 MW |
822 | return 0; |
823 | } | |
824 | ||
a7bb3909 EM |
825 | static int setup_cs(struct spi_device *spi, struct chip_data *chip, |
826 | struct pxa2xx_spi_chip *chip_info) | |
827 | { | |
828 | int err = 0; | |
829 | ||
830 | if (chip == NULL || chip_info == NULL) | |
831 | return 0; | |
832 | ||
833 | /* NOTE: setup() can be called multiple times, possibly with | |
834 | * different chip_info, release previously requested GPIO | |
835 | */ | |
836 | if (gpio_is_valid(chip->gpio_cs)) | |
837 | gpio_free(chip->gpio_cs); | |
838 | ||
839 | /* If (*cs_control) is provided, ignore GPIO chip select */ | |
840 | if (chip_info->cs_control) { | |
841 | chip->cs_control = chip_info->cs_control; | |
842 | return 0; | |
843 | } | |
844 | ||
845 | if (gpio_is_valid(chip_info->gpio_cs)) { | |
846 | err = gpio_request(chip_info->gpio_cs, "SPI_CS"); | |
847 | if (err) { | |
848 | dev_err(&spi->dev, "failed to request chip select " | |
849 | "GPIO%d\n", chip_info->gpio_cs); | |
850 | return err; | |
851 | } | |
852 | ||
853 | chip->gpio_cs = chip_info->gpio_cs; | |
854 | chip->gpio_cs_inverted = spi->mode & SPI_CS_HIGH; | |
855 | ||
856 | err = gpio_direction_output(chip->gpio_cs, | |
857 | !chip->gpio_cs_inverted); | |
858 | } | |
859 | ||
860 | return err; | |
861 | } | |
862 | ||
e0c9905e SS |
863 | static int setup(struct spi_device *spi) |
864 | { | |
865 | struct pxa2xx_spi_chip *chip_info = NULL; | |
866 | struct chip_data *chip; | |
867 | struct driver_data *drv_data = spi_master_get_devdata(spi->master); | |
868 | unsigned int clk_div; | |
a0d2642e MW |
869 | uint tx_thres, tx_hi_thres, rx_thres; |
870 | ||
871 | if (is_lpss_ssp(drv_data)) { | |
872 | tx_thres = LPSS_TX_LOTHRESH_DFLT; | |
873 | tx_hi_thres = LPSS_TX_HITHRESH_DFLT; | |
874 | rx_thres = LPSS_RX_THRESH_DFLT; | |
875 | } else { | |
876 | tx_thres = TX_THRESH_DFLT; | |
877 | tx_hi_thres = 0; | |
878 | rx_thres = RX_THRESH_DFLT; | |
879 | } | |
e0c9905e | 880 | |
8d94cc50 | 881 | /* Only alloc on first setup */ |
e0c9905e | 882 | chip = spi_get_ctldata(spi); |
8d94cc50 | 883 | if (!chip) { |
e0c9905e | 884 | chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); |
8d94cc50 SS |
885 | if (!chip) { |
886 | dev_err(&spi->dev, | |
887 | "failed setup: can't allocate chip data\n"); | |
e0c9905e | 888 | return -ENOMEM; |
8d94cc50 | 889 | } |
e0c9905e | 890 | |
2a8626a9 SAS |
891 | if (drv_data->ssp_type == CE4100_SSP) { |
892 | if (spi->chip_select > 4) { | |
893 | dev_err(&spi->dev, "failed setup: " | |
894 | "cs number must not be > 4.\n"); | |
895 | kfree(chip); | |
896 | return -EINVAL; | |
897 | } | |
898 | ||
899 | chip->frm = spi->chip_select; | |
900 | } else | |
901 | chip->gpio_cs = -1; | |
e0c9905e | 902 | chip->enable_dma = 0; |
f1f640a9 | 903 | chip->timeout = TIMOUT_DFLT; |
e0c9905e SS |
904 | } |
905 | ||
8d94cc50 SS |
906 | /* protocol drivers may change the chip settings, so... |
907 | * if chip_info exists, use it */ | |
908 | chip_info = spi->controller_data; | |
909 | ||
e0c9905e | 910 | /* chip_info isn't always needed */ |
8d94cc50 | 911 | chip->cr1 = 0; |
e0c9905e | 912 | if (chip_info) { |
f1f640a9 VS |
913 | if (chip_info->timeout) |
914 | chip->timeout = chip_info->timeout; | |
915 | if (chip_info->tx_threshold) | |
916 | tx_thres = chip_info->tx_threshold; | |
a0d2642e MW |
917 | if (chip_info->tx_hi_threshold) |
918 | tx_hi_thres = chip_info->tx_hi_threshold; | |
f1f640a9 VS |
919 | if (chip_info->rx_threshold) |
920 | rx_thres = chip_info->rx_threshold; | |
921 | chip->enable_dma = drv_data->master_info->enable_dma; | |
e0c9905e | 922 | chip->dma_threshold = 0; |
e0c9905e SS |
923 | if (chip_info->enable_loopback) |
924 | chip->cr1 = SSCR1_LBM; | |
a3496855 MW |
925 | } else if (ACPI_HANDLE(&spi->dev)) { |
926 | /* | |
927 | * Slave devices enumerated from ACPI namespace don't | |
928 | * usually have chip_info but we still might want to use | |
929 | * DMA with them. | |
930 | */ | |
931 | chip->enable_dma = drv_data->master_info->enable_dma; | |
e0c9905e SS |
932 | } |
933 | ||
f1f640a9 VS |
934 | chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) | |
935 | (SSCR1_TxTresh(tx_thres) & SSCR1_TFT); | |
936 | ||
a0d2642e MW |
937 | chip->lpss_rx_threshold = SSIRF_RxThresh(rx_thres); |
938 | chip->lpss_tx_threshold = SSITF_TxLoThresh(tx_thres) | |
939 | | SSITF_TxHiThresh(tx_hi_thres); | |
940 | ||
8d94cc50 SS |
941 | /* set dma burst and threshold outside of chip_info path so that if |
942 | * chip_info goes away after setting chip->enable_dma, the | |
943 | * burst and threshold can still respond to changes in bits_per_word */ | |
944 | if (chip->enable_dma) { | |
945 | /* set up legal burst and threshold for dma */ | |
cd7bed00 MW |
946 | if (pxa2xx_spi_set_dma_burst_and_threshold(chip, spi, |
947 | spi->bits_per_word, | |
8d94cc50 SS |
948 | &chip->dma_burst_size, |
949 | &chip->dma_threshold)) { | |
950 | dev_warn(&spi->dev, "in setup: DMA burst size reduced " | |
951 | "to match bits_per_word\n"); | |
952 | } | |
953 | } | |
954 | ||
3343b7a6 | 955 | clk_div = ssp_get_clk_div(drv_data, spi->max_speed_hz); |
9708c121 | 956 | chip->speed_hz = spi->max_speed_hz; |
e0c9905e SS |
957 | |
958 | chip->cr0 = clk_div | |
959 | | SSCR0_Motorola | |
5daa3ba0 SS |
960 | | SSCR0_DataSize(spi->bits_per_word > 16 ? |
961 | spi->bits_per_word - 16 : spi->bits_per_word) | |
e0c9905e SS |
962 | | SSCR0_SSE |
963 | | (spi->bits_per_word > 16 ? SSCR0_EDSS : 0); | |
7f6ee1ad JC |
964 | chip->cr1 &= ~(SSCR1_SPO | SSCR1_SPH); |
965 | chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) ? SSCR1_SPH : 0) | |
966 | | (((spi->mode & SPI_CPOL) != 0) ? SSCR1_SPO : 0); | |
e0c9905e | 967 | |
b833172f MW |
968 | if (spi->mode & SPI_LOOP) |
969 | chip->cr1 |= SSCR1_LBM; | |
970 | ||
e0c9905e | 971 | /* NOTE: PXA25x_SSP _could_ use external clocking ... */ |
2a8626a9 | 972 | if (!pxa25x_ssp_comp(drv_data)) |
7d077197 | 973 | dev_dbg(&spi->dev, "%ld Hz actual, %s\n", |
3343b7a6 | 974 | drv_data->max_clk_rate |
c9840daa EM |
975 | / (1 + ((chip->cr0 & SSCR0_SCR(0xfff)) >> 8)), |
976 | chip->enable_dma ? "DMA" : "PIO"); | |
e0c9905e | 977 | else |
7d077197 | 978 | dev_dbg(&spi->dev, "%ld Hz actual, %s\n", |
3343b7a6 | 979 | drv_data->max_clk_rate / 2 |
c9840daa EM |
980 | / (1 + ((chip->cr0 & SSCR0_SCR(0x0ff)) >> 8)), |
981 | chip->enable_dma ? "DMA" : "PIO"); | |
e0c9905e SS |
982 | |
983 | if (spi->bits_per_word <= 8) { | |
984 | chip->n_bytes = 1; | |
e0c9905e SS |
985 | chip->read = u8_reader; |
986 | chip->write = u8_writer; | |
987 | } else if (spi->bits_per_word <= 16) { | |
988 | chip->n_bytes = 2; | |
e0c9905e SS |
989 | chip->read = u16_reader; |
990 | chip->write = u16_writer; | |
991 | } else if (spi->bits_per_word <= 32) { | |
992 | chip->cr0 |= SSCR0_EDSS; | |
993 | chip->n_bytes = 4; | |
e0c9905e SS |
994 | chip->read = u32_reader; |
995 | chip->write = u32_writer; | |
e0c9905e | 996 | } |
9708c121 | 997 | chip->bits_per_word = spi->bits_per_word; |
e0c9905e SS |
998 | |
999 | spi_set_ctldata(spi, chip); | |
1000 | ||
2a8626a9 SAS |
1001 | if (drv_data->ssp_type == CE4100_SSP) |
1002 | return 0; | |
1003 | ||
a7bb3909 | 1004 | return setup_cs(spi, chip, chip_info); |
e0c9905e SS |
1005 | } |
1006 | ||
0ffa0285 | 1007 | static void cleanup(struct spi_device *spi) |
e0c9905e | 1008 | { |
0ffa0285 | 1009 | struct chip_data *chip = spi_get_ctldata(spi); |
2a8626a9 | 1010 | struct driver_data *drv_data = spi_master_get_devdata(spi->master); |
e0c9905e | 1011 | |
7348d82a DR |
1012 | if (!chip) |
1013 | return; | |
1014 | ||
2a8626a9 | 1015 | if (drv_data->ssp_type != CE4100_SSP && gpio_is_valid(chip->gpio_cs)) |
a7bb3909 EM |
1016 | gpio_free(chip->gpio_cs); |
1017 | ||
e0c9905e SS |
1018 | kfree(chip); |
1019 | } | |
1020 | ||
a3496855 | 1021 | #ifdef CONFIG_ACPI |
a3496855 MW |
1022 | static struct pxa2xx_spi_master * |
1023 | pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev) | |
1024 | { | |
1025 | struct pxa2xx_spi_master *pdata; | |
a3496855 MW |
1026 | struct acpi_device *adev; |
1027 | struct ssp_device *ssp; | |
1028 | struct resource *res; | |
1029 | int devid; | |
1030 | ||
1031 | if (!ACPI_HANDLE(&pdev->dev) || | |
1032 | acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev)) | |
1033 | return NULL; | |
1034 | ||
cc0ee987 | 1035 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); |
a3496855 MW |
1036 | if (!pdata) { |
1037 | dev_err(&pdev->dev, | |
1038 | "failed to allocate memory for platform data\n"); | |
1039 | return NULL; | |
1040 | } | |
1041 | ||
1042 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1043 | if (!res) | |
1044 | return NULL; | |
1045 | ||
1046 | ssp = &pdata->ssp; | |
1047 | ||
1048 | ssp->phys_base = res->start; | |
cbfd6a21 SK |
1049 | ssp->mmio_base = devm_ioremap_resource(&pdev->dev, res); |
1050 | if (IS_ERR(ssp->mmio_base)) | |
6dc81f6f | 1051 | return NULL; |
a3496855 MW |
1052 | |
1053 | ssp->clk = devm_clk_get(&pdev->dev, NULL); | |
1054 | ssp->irq = platform_get_irq(pdev, 0); | |
1055 | ssp->type = LPSS_SSP; | |
1056 | ssp->pdev = pdev; | |
1057 | ||
1058 | ssp->port_id = -1; | |
1059 | if (adev->pnp.unique_id && !kstrtoint(adev->pnp.unique_id, 0, &devid)) | |
1060 | ssp->port_id = devid; | |
1061 | ||
1062 | pdata->num_chipselect = 1; | |
cddb339b | 1063 | pdata->enable_dma = true; |
a3496855 MW |
1064 | |
1065 | return pdata; | |
1066 | } | |
1067 | ||
1068 | static struct acpi_device_id pxa2xx_spi_acpi_match[] = { | |
1069 | { "INT33C0", 0 }, | |
1070 | { "INT33C1", 0 }, | |
4b30f2a1 | 1071 | { "80860F0E", 0 }, |
a3496855 MW |
1072 | { }, |
1073 | }; | |
1074 | MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match); | |
1075 | #else | |
1076 | static inline struct pxa2xx_spi_master * | |
1077 | pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev) | |
1078 | { | |
1079 | return NULL; | |
1080 | } | |
1081 | #endif | |
1082 | ||
fd4a319b | 1083 | static int pxa2xx_spi_probe(struct platform_device *pdev) |
e0c9905e SS |
1084 | { |
1085 | struct device *dev = &pdev->dev; | |
1086 | struct pxa2xx_spi_master *platform_info; | |
1087 | struct spi_master *master; | |
65a00a20 | 1088 | struct driver_data *drv_data; |
2f1a74e5 | 1089 | struct ssp_device *ssp; |
65a00a20 | 1090 | int status; |
e0c9905e | 1091 | |
851bacf5 MW |
1092 | platform_info = dev_get_platdata(dev); |
1093 | if (!platform_info) { | |
a3496855 MW |
1094 | platform_info = pxa2xx_spi_acpi_get_pdata(pdev); |
1095 | if (!platform_info) { | |
1096 | dev_err(&pdev->dev, "missing platform data\n"); | |
1097 | return -ENODEV; | |
1098 | } | |
851bacf5 | 1099 | } |
e0c9905e | 1100 | |
baffe169 | 1101 | ssp = pxa_ssp_request(pdev->id, pdev->name); |
851bacf5 MW |
1102 | if (!ssp) |
1103 | ssp = &platform_info->ssp; | |
1104 | ||
1105 | if (!ssp->mmio_base) { | |
1106 | dev_err(&pdev->dev, "failed to get ssp\n"); | |
e0c9905e SS |
1107 | return -ENODEV; |
1108 | } | |
1109 | ||
1110 | /* Allocate master with space for drv_data and null dma buffer */ | |
1111 | master = spi_alloc_master(dev, sizeof(struct driver_data) + 16); | |
1112 | if (!master) { | |
65a00a20 | 1113 | dev_err(&pdev->dev, "cannot alloc spi_master\n"); |
baffe169 | 1114 | pxa_ssp_free(ssp); |
e0c9905e SS |
1115 | return -ENOMEM; |
1116 | } | |
1117 | drv_data = spi_master_get_devdata(master); | |
1118 | drv_data->master = master; | |
1119 | drv_data->master_info = platform_info; | |
1120 | drv_data->pdev = pdev; | |
2f1a74e5 | 1121 | drv_data->ssp = ssp; |
e0c9905e | 1122 | |
21486af0 | 1123 | master->dev.parent = &pdev->dev; |
21486af0 | 1124 | master->dev.of_node = pdev->dev.of_node; |
e7db06b5 | 1125 | /* the spi->mode bits understood by this driver: */ |
b833172f | 1126 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP; |
e7db06b5 | 1127 | |
851bacf5 | 1128 | master->bus_num = ssp->port_id; |
e0c9905e | 1129 | master->num_chipselect = platform_info->num_chipselect; |
7ad0ba91 | 1130 | master->dma_alignment = DMA_ALIGNMENT; |
e0c9905e SS |
1131 | master->cleanup = cleanup; |
1132 | master->setup = setup; | |
7f86bde9 | 1133 | master->transfer_one_message = pxa2xx_spi_transfer_one_message; |
7d94a505 | 1134 | master->unprepare_transfer_hardware = pxa2xx_spi_unprepare_transfer; |
7dd62787 | 1135 | master->auto_runtime_pm = true; |
e0c9905e | 1136 | |
2f1a74e5 | 1137 | drv_data->ssp_type = ssp->type; |
2b9b84f4 | 1138 | drv_data->null_dma_buf = (u32 *)PTR_ALIGN(&drv_data[1], DMA_ALIGNMENT); |
e0c9905e | 1139 | |
2f1a74e5 | 1140 | drv_data->ioaddr = ssp->mmio_base; |
1141 | drv_data->ssdr_physical = ssp->phys_base + SSDR; | |
2a8626a9 | 1142 | if (pxa25x_ssp_comp(drv_data)) { |
24778be2 | 1143 | master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); |
e0c9905e SS |
1144 | drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE; |
1145 | drv_data->dma_cr1 = 0; | |
1146 | drv_data->clear_sr = SSSR_ROR; | |
1147 | drv_data->mask_sr = SSSR_RFS | SSSR_TFS | SSSR_ROR; | |
1148 | } else { | |
24778be2 | 1149 | master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); |
e0c9905e | 1150 | drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE | SSCR1_TINTE; |
5928808e | 1151 | drv_data->dma_cr1 = DEFAULT_DMA_CR1; |
e0c9905e SS |
1152 | drv_data->clear_sr = SSSR_ROR | SSSR_TINT; |
1153 | drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR; | |
1154 | } | |
1155 | ||
49cbb1e0 SAS |
1156 | status = request_irq(ssp->irq, ssp_int, IRQF_SHARED, dev_name(dev), |
1157 | drv_data); | |
e0c9905e | 1158 | if (status < 0) { |
65a00a20 | 1159 | dev_err(&pdev->dev, "cannot get IRQ %d\n", ssp->irq); |
e0c9905e SS |
1160 | goto out_error_master_alloc; |
1161 | } | |
1162 | ||
1163 | /* Setup DMA if requested */ | |
1164 | drv_data->tx_channel = -1; | |
1165 | drv_data->rx_channel = -1; | |
1166 | if (platform_info->enable_dma) { | |
cd7bed00 MW |
1167 | status = pxa2xx_spi_dma_setup(drv_data); |
1168 | if (status) { | |
cddb339b | 1169 | dev_dbg(dev, "no DMA channels available, using PIO\n"); |
cd7bed00 | 1170 | platform_info->enable_dma = false; |
e0c9905e | 1171 | } |
e0c9905e SS |
1172 | } |
1173 | ||
1174 | /* Enable SOC clock */ | |
3343b7a6 MW |
1175 | clk_prepare_enable(ssp->clk); |
1176 | ||
1177 | drv_data->max_clk_rate = clk_get_rate(ssp->clk); | |
e0c9905e SS |
1178 | |
1179 | /* Load default SSP configuration */ | |
1180 | write_SSCR0(0, drv_data->ioaddr); | |
f1f640a9 VS |
1181 | write_SSCR1(SSCR1_RxTresh(RX_THRESH_DFLT) | |
1182 | SSCR1_TxTresh(TX_THRESH_DFLT), | |
1183 | drv_data->ioaddr); | |
c9840daa | 1184 | write_SSCR0(SSCR0_SCR(2) |
e0c9905e SS |
1185 | | SSCR0_Motorola |
1186 | | SSCR0_DataSize(8), | |
1187 | drv_data->ioaddr); | |
2a8626a9 | 1188 | if (!pxa25x_ssp_comp(drv_data)) |
e0c9905e SS |
1189 | write_SSTO(0, drv_data->ioaddr); |
1190 | write_SSPSP(0, drv_data->ioaddr); | |
1191 | ||
a0d2642e MW |
1192 | lpss_ssp_setup(drv_data); |
1193 | ||
7f86bde9 MW |
1194 | tasklet_init(&drv_data->pump_transfers, pump_transfers, |
1195 | (unsigned long)drv_data); | |
e0c9905e SS |
1196 | |
1197 | /* Register with the SPI framework */ | |
1198 | platform_set_drvdata(pdev, drv_data); | |
1199 | status = spi_register_master(master); | |
1200 | if (status != 0) { | |
1201 | dev_err(&pdev->dev, "problem registering spi master\n"); | |
7f86bde9 | 1202 | goto out_error_clock_enabled; |
e0c9905e SS |
1203 | } |
1204 | ||
7d94a505 MW |
1205 | pm_runtime_set_autosuspend_delay(&pdev->dev, 50); |
1206 | pm_runtime_use_autosuspend(&pdev->dev); | |
1207 | pm_runtime_set_active(&pdev->dev); | |
1208 | pm_runtime_enable(&pdev->dev); | |
1209 | ||
e0c9905e SS |
1210 | return status; |
1211 | ||
e0c9905e | 1212 | out_error_clock_enabled: |
3343b7a6 | 1213 | clk_disable_unprepare(ssp->clk); |
cd7bed00 | 1214 | pxa2xx_spi_dma_release(drv_data); |
2f1a74e5 | 1215 | free_irq(ssp->irq, drv_data); |
e0c9905e SS |
1216 | |
1217 | out_error_master_alloc: | |
1218 | spi_master_put(master); | |
baffe169 | 1219 | pxa_ssp_free(ssp); |
e0c9905e SS |
1220 | return status; |
1221 | } | |
1222 | ||
1223 | static int pxa2xx_spi_remove(struct platform_device *pdev) | |
1224 | { | |
1225 | struct driver_data *drv_data = platform_get_drvdata(pdev); | |
51e911e2 | 1226 | struct ssp_device *ssp; |
e0c9905e SS |
1227 | |
1228 | if (!drv_data) | |
1229 | return 0; | |
51e911e2 | 1230 | ssp = drv_data->ssp; |
e0c9905e | 1231 | |
7d94a505 MW |
1232 | pm_runtime_get_sync(&pdev->dev); |
1233 | ||
e0c9905e SS |
1234 | /* Disable the SSP at the peripheral and SOC level */ |
1235 | write_SSCR0(0, drv_data->ioaddr); | |
3343b7a6 | 1236 | clk_disable_unprepare(ssp->clk); |
e0c9905e SS |
1237 | |
1238 | /* Release DMA */ | |
cd7bed00 MW |
1239 | if (drv_data->master_info->enable_dma) |
1240 | pxa2xx_spi_dma_release(drv_data); | |
e0c9905e | 1241 | |
7d94a505 MW |
1242 | pm_runtime_put_noidle(&pdev->dev); |
1243 | pm_runtime_disable(&pdev->dev); | |
1244 | ||
e0c9905e | 1245 | /* Release IRQ */ |
2f1a74e5 | 1246 | free_irq(ssp->irq, drv_data); |
1247 | ||
1248 | /* Release SSP */ | |
baffe169 | 1249 | pxa_ssp_free(ssp); |
e0c9905e SS |
1250 | |
1251 | /* Disconnect from the SPI framework */ | |
1252 | spi_unregister_master(drv_data->master); | |
1253 | ||
e0c9905e SS |
1254 | return 0; |
1255 | } | |
1256 | ||
1257 | static void pxa2xx_spi_shutdown(struct platform_device *pdev) | |
1258 | { | |
1259 | int status = 0; | |
1260 | ||
1261 | if ((status = pxa2xx_spi_remove(pdev)) != 0) | |
1262 | dev_err(&pdev->dev, "shutdown failed with %d\n", status); | |
1263 | } | |
1264 | ||
1265 | #ifdef CONFIG_PM | |
86d2593a | 1266 | static int pxa2xx_spi_suspend(struct device *dev) |
e0c9905e | 1267 | { |
86d2593a | 1268 | struct driver_data *drv_data = dev_get_drvdata(dev); |
2f1a74e5 | 1269 | struct ssp_device *ssp = drv_data->ssp; |
e0c9905e SS |
1270 | int status = 0; |
1271 | ||
7f86bde9 | 1272 | status = spi_master_suspend(drv_data->master); |
e0c9905e SS |
1273 | if (status != 0) |
1274 | return status; | |
1275 | write_SSCR0(0, drv_data->ioaddr); | |
3343b7a6 | 1276 | clk_disable_unprepare(ssp->clk); |
e0c9905e SS |
1277 | |
1278 | return 0; | |
1279 | } | |
1280 | ||
86d2593a | 1281 | static int pxa2xx_spi_resume(struct device *dev) |
e0c9905e | 1282 | { |
86d2593a | 1283 | struct driver_data *drv_data = dev_get_drvdata(dev); |
2f1a74e5 | 1284 | struct ssp_device *ssp = drv_data->ssp; |
e0c9905e SS |
1285 | int status = 0; |
1286 | ||
cd7bed00 | 1287 | pxa2xx_spi_dma_resume(drv_data); |
148da331 | 1288 | |
e0c9905e | 1289 | /* Enable the SSP clock */ |
3343b7a6 | 1290 | clk_prepare_enable(ssp->clk); |
e0c9905e SS |
1291 | |
1292 | /* Start the queue running */ | |
7f86bde9 | 1293 | status = spi_master_resume(drv_data->master); |
e0c9905e | 1294 | if (status != 0) { |
86d2593a | 1295 | dev_err(dev, "problem starting queue (%d)\n", status); |
e0c9905e SS |
1296 | return status; |
1297 | } | |
1298 | ||
1299 | return 0; | |
1300 | } | |
7d94a505 MW |
1301 | #endif |
1302 | ||
1303 | #ifdef CONFIG_PM_RUNTIME | |
1304 | static int pxa2xx_spi_runtime_suspend(struct device *dev) | |
1305 | { | |
1306 | struct driver_data *drv_data = dev_get_drvdata(dev); | |
1307 | ||
1308 | clk_disable_unprepare(drv_data->ssp->clk); | |
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | static int pxa2xx_spi_runtime_resume(struct device *dev) | |
1313 | { | |
1314 | struct driver_data *drv_data = dev_get_drvdata(dev); | |
1315 | ||
1316 | clk_prepare_enable(drv_data->ssp->clk); | |
1317 | return 0; | |
1318 | } | |
1319 | #endif | |
86d2593a | 1320 | |
47145210 | 1321 | static const struct dev_pm_ops pxa2xx_spi_pm_ops = { |
7d94a505 MW |
1322 | SET_SYSTEM_SLEEP_PM_OPS(pxa2xx_spi_suspend, pxa2xx_spi_resume) |
1323 | SET_RUNTIME_PM_OPS(pxa2xx_spi_runtime_suspend, | |
1324 | pxa2xx_spi_runtime_resume, NULL) | |
86d2593a | 1325 | }; |
e0c9905e SS |
1326 | |
1327 | static struct platform_driver driver = { | |
1328 | .driver = { | |
86d2593a MR |
1329 | .name = "pxa2xx-spi", |
1330 | .owner = THIS_MODULE, | |
86d2593a | 1331 | .pm = &pxa2xx_spi_pm_ops, |
a3496855 | 1332 | .acpi_match_table = ACPI_PTR(pxa2xx_spi_acpi_match), |
e0c9905e | 1333 | }, |
fbd29a14 | 1334 | .probe = pxa2xx_spi_probe, |
d1e44d9c | 1335 | .remove = pxa2xx_spi_remove, |
e0c9905e | 1336 | .shutdown = pxa2xx_spi_shutdown, |
e0c9905e SS |
1337 | }; |
1338 | ||
1339 | static int __init pxa2xx_spi_init(void) | |
1340 | { | |
fbd29a14 | 1341 | return platform_driver_register(&driver); |
e0c9905e | 1342 | } |
5b61a749 | 1343 | subsys_initcall(pxa2xx_spi_init); |
e0c9905e SS |
1344 | |
1345 | static void __exit pxa2xx_spi_exit(void) | |
1346 | { | |
1347 | platform_driver_unregister(&driver); | |
1348 | } | |
1349 | module_exit(pxa2xx_spi_exit); |