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142168eb JG |
1 | /* |
2 | * Broadcom BCM63XX High Speed SPI Controller driver | |
3 | * | |
4 | * Copyright 2000-2010 Broadcom Corporation | |
879a879c | 5 | * Copyright 2012-2013 Jonas Gorski <jonas.gorski@gmail.com> |
142168eb JG |
6 | * |
7 | * Licensed under the GNU/GPL. See COPYING for details. | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/clk.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/dma-mapping.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/spi/spi.h> | |
142168eb | 21 | #include <linux/mutex.h> |
7ab24635 | 22 | #include <linux/of.h> |
c6182a18 WZ |
23 | #include <linux/spi/spi-mem.h> |
24 | #include <linux/mtd/spi-nor.h> | |
0eeadddb | 25 | #include <linux/reset.h> |
fb8695e3 | 26 | #include <linux/pm_runtime.h> |
142168eb JG |
27 | |
28 | #define HSSPI_GLOBAL_CTRL_REG 0x0 | |
29 | #define GLOBAL_CTRL_CS_POLARITY_SHIFT 0 | |
30 | #define GLOBAL_CTRL_CS_POLARITY_MASK 0x000000ff | |
31 | #define GLOBAL_CTRL_PLL_CLK_CTRL_SHIFT 8 | |
32 | #define GLOBAL_CTRL_PLL_CLK_CTRL_MASK 0x0000ff00 | |
33 | #define GLOBAL_CTRL_CLK_GATE_SSOFF BIT(16) | |
34 | #define GLOBAL_CTRL_CLK_POLARITY BIT(17) | |
35 | #define GLOBAL_CTRL_MOSI_IDLE BIT(18) | |
36 | ||
37 | #define HSSPI_GLOBAL_EXT_TRIGGER_REG 0x4 | |
38 | ||
39 | #define HSSPI_INT_STATUS_REG 0x8 | |
40 | #define HSSPI_INT_STATUS_MASKED_REG 0xc | |
41 | #define HSSPI_INT_MASK_REG 0x10 | |
42 | ||
43 | #define HSSPI_PINGx_CMD_DONE(i) BIT((i * 8) + 0) | |
44 | #define HSSPI_PINGx_RX_OVER(i) BIT((i * 8) + 1) | |
45 | #define HSSPI_PINGx_TX_UNDER(i) BIT((i * 8) + 2) | |
46 | #define HSSPI_PINGx_POLL_TIMEOUT(i) BIT((i * 8) + 3) | |
47 | #define HSSPI_PINGx_CTRL_INVAL(i) BIT((i * 8) + 4) | |
48 | ||
49 | #define HSSPI_INT_CLEAR_ALL 0xff001f1f | |
50 | ||
51 | #define HSSPI_PINGPONG_COMMAND_REG(x) (0x80 + (x) * 0x40) | |
52 | #define PINGPONG_CMD_COMMAND_MASK 0xf | |
53 | #define PINGPONG_COMMAND_NOOP 0 | |
54 | #define PINGPONG_COMMAND_START_NOW 1 | |
55 | #define PINGPONG_COMMAND_START_TRIGGER 2 | |
56 | #define PINGPONG_COMMAND_HALT 3 | |
57 | #define PINGPONG_COMMAND_FLUSH 4 | |
58 | #define PINGPONG_CMD_PROFILE_SHIFT 8 | |
59 | #define PINGPONG_CMD_SS_SHIFT 12 | |
60 | ||
61 | #define HSSPI_PINGPONG_STATUS_REG(x) (0x84 + (x) * 0x40) | |
50a6620d | 62 | #define HSSPI_PINGPONG_STATUS_SRC_BUSY BIT(1) |
142168eb JG |
63 | |
64 | #define HSSPI_PROFILE_CLK_CTRL_REG(x) (0x100 + (x) * 0x20) | |
65 | #define CLK_CTRL_FREQ_CTRL_MASK 0x0000ffff | |
66 | #define CLK_CTRL_SPI_CLK_2X_SEL BIT(14) | |
67 | #define CLK_CTRL_ACCUM_RST_ON_LOOP BIT(15) | |
68 | ||
69 | #define HSSPI_PROFILE_SIGNAL_CTRL_REG(x) (0x104 + (x) * 0x20) | |
70 | #define SIGNAL_CTRL_LATCH_RISING BIT(12) | |
71 | #define SIGNAL_CTRL_LAUNCH_RISING BIT(13) | |
72 | #define SIGNAL_CTRL_ASYNC_INPUT_PATH BIT(16) | |
73 | ||
74 | #define HSSPI_PROFILE_MODE_CTRL_REG(x) (0x108 + (x) * 0x20) | |
75 | #define MODE_CTRL_MULTIDATA_RD_STRT_SHIFT 8 | |
76 | #define MODE_CTRL_MULTIDATA_WR_STRT_SHIFT 12 | |
77 | #define MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT 16 | |
78 | #define MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT 18 | |
79 | #define MODE_CTRL_MODE_3WIRE BIT(20) | |
80 | #define MODE_CTRL_PREPENDBYTE_CNT_SHIFT 24 | |
81 | ||
82 | #define HSSPI_FIFO_REG(x) (0x200 + (x) * 0x200) | |
83 | ||
84 | ||
f4d86223 | 85 | #define HSSPI_OP_MULTIBIT BIT(11) |
142168eb JG |
86 | #define HSSPI_OP_CODE_SHIFT 13 |
87 | #define HSSPI_OP_SLEEP (0 << HSSPI_OP_CODE_SHIFT) | |
88 | #define HSSPI_OP_READ_WRITE (1 << HSSPI_OP_CODE_SHIFT) | |
89 | #define HSSPI_OP_WRITE (2 << HSSPI_OP_CODE_SHIFT) | |
90 | #define HSSPI_OP_READ (3 << HSSPI_OP_CODE_SHIFT) | |
91 | #define HSSPI_OP_SETIRQ (4 << HSSPI_OP_CODE_SHIFT) | |
92 | ||
93 | #define HSSPI_BUFFER_LEN 512 | |
94 | #define HSSPI_OPCODE_LEN 2 | |
95 | ||
96 | #define HSSPI_MAX_PREPEND_LEN 15 | |
97 | ||
b7a82103 WZ |
98 | /* |
99 | * Some chip require 30MHz but other require 25MHz. Use smaller value to cover | |
100 | * both cases. | |
101 | */ | |
102 | #define HSSPI_MAX_SYNC_CLOCK 25000000 | |
142168eb | 103 | |
7ab24635 | 104 | #define HSSPI_SPI_MAX_CS 8 |
142168eb | 105 | #define HSSPI_BUS_NUM 1 /* 0 is legacy SPI */ |
50a6620d WZ |
106 | #define HSSPI_POLL_STATUS_TIMEOUT_MS 100 |
107 | ||
108 | #define HSSPI_WAIT_MODE_POLLING 0 | |
109 | #define HSSPI_WAIT_MODE_INTR 1 | |
110 | #define HSSPI_WAIT_MODE_MAX HSSPI_WAIT_MODE_INTR | |
142168eb | 111 | |
b7a82103 WZ |
112 | /* |
113 | * Default transfer mode is auto. If the msg is prependable, use the prepend | |
114 | * mode. If not, falls back to use the dummy cs workaround mode but limit the | |
115 | * clock to 25MHz to make sure it works in all board design. | |
116 | */ | |
117 | #define HSSPI_XFER_MODE_AUTO 0 | |
118 | #define HSSPI_XFER_MODE_PREPEND 1 | |
119 | #define HSSPI_XFER_MODE_DUMMYCS 2 | |
120 | #define HSSPI_XFER_MODE_MAX HSSPI_XFER_MODE_DUMMYCS | |
121 | ||
122 | #define bcm63xx_prepend_printk_on_checkfail(bs, fmt, ...) \ | |
123 | do { \ | |
124 | if (bs->xfer_mode == HSSPI_XFER_MODE_AUTO) \ | |
125 | dev_dbg(&bs->pdev->dev, fmt, ##__VA_ARGS__); \ | |
126 | else if (bs->xfer_mode == HSSPI_XFER_MODE_PREPEND) \ | |
127 | dev_err(&bs->pdev->dev, fmt, ##__VA_ARGS__); \ | |
128 | } while (0) | |
129 | ||
142168eb JG |
130 | struct bcm63xx_hsspi { |
131 | struct completion done; | |
132 | struct mutex bus_mutex; | |
50a6620d | 133 | struct mutex msg_mutex; |
142168eb JG |
134 | struct platform_device *pdev; |
135 | struct clk *clk; | |
0fd85869 | 136 | struct clk *pll_clk; |
142168eb JG |
137 | void __iomem *regs; |
138 | u8 __iomem *fifo; | |
139 | ||
140 | u32 speed_hz; | |
141 | u8 cs_polarity; | |
50a6620d | 142 | u32 wait_mode; |
b7a82103 WZ |
143 | u32 xfer_mode; |
144 | u32 prepend_cnt; | |
145 | u8 *prepend_buf; | |
50a6620d WZ |
146 | }; |
147 | ||
148 | static ssize_t wait_mode_show(struct device *dev, struct device_attribute *attr, | |
149 | char *buf) | |
150 | { | |
151 | struct spi_controller *ctrl = dev_get_drvdata(dev); | |
2c40be6b | 152 | struct bcm63xx_hsspi *bs = spi_controller_get_devdata(ctrl); |
50a6620d WZ |
153 | |
154 | return sprintf(buf, "%d\n", bs->wait_mode); | |
155 | } | |
156 | ||
157 | static ssize_t wait_mode_store(struct device *dev, struct device_attribute *attr, | |
158 | const char *buf, size_t count) | |
159 | { | |
160 | struct spi_controller *ctrl = dev_get_drvdata(dev); | |
2c40be6b | 161 | struct bcm63xx_hsspi *bs = spi_controller_get_devdata(ctrl); |
50a6620d WZ |
162 | u32 val; |
163 | ||
164 | if (kstrtou32(buf, 10, &val)) | |
165 | return -EINVAL; | |
166 | ||
167 | if (val > HSSPI_WAIT_MODE_MAX) { | |
168 | dev_warn(dev, "invalid wait mode %u\n", val); | |
169 | return -EINVAL; | |
170 | } | |
171 | ||
172 | mutex_lock(&bs->msg_mutex); | |
173 | bs->wait_mode = val; | |
174 | /* clear interrupt status to avoid spurious int on next transfer */ | |
175 | if (val == HSSPI_WAIT_MODE_INTR) | |
176 | __raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG); | |
177 | mutex_unlock(&bs->msg_mutex); | |
178 | ||
179 | return count; | |
180 | } | |
181 | ||
182 | static DEVICE_ATTR_RW(wait_mode); | |
183 | ||
b7a82103 WZ |
184 | static ssize_t xfer_mode_show(struct device *dev, struct device_attribute *attr, |
185 | char *buf) | |
186 | { | |
187 | struct spi_controller *ctrl = dev_get_drvdata(dev); | |
2c40be6b | 188 | struct bcm63xx_hsspi *bs = spi_controller_get_devdata(ctrl); |
b7a82103 WZ |
189 | |
190 | return sprintf(buf, "%d\n", bs->xfer_mode); | |
191 | } | |
192 | ||
193 | static ssize_t xfer_mode_store(struct device *dev, struct device_attribute *attr, | |
194 | const char *buf, size_t count) | |
195 | { | |
196 | struct spi_controller *ctrl = dev_get_drvdata(dev); | |
2c40be6b | 197 | struct bcm63xx_hsspi *bs = spi_controller_get_devdata(ctrl); |
b7a82103 WZ |
198 | u32 val; |
199 | ||
200 | if (kstrtou32(buf, 10, &val)) | |
201 | return -EINVAL; | |
202 | ||
203 | if (val > HSSPI_XFER_MODE_MAX) { | |
204 | dev_warn(dev, "invalid xfer mode %u\n", val); | |
205 | return -EINVAL; | |
206 | } | |
207 | ||
208 | mutex_lock(&bs->msg_mutex); | |
209 | bs->xfer_mode = val; | |
210 | mutex_unlock(&bs->msg_mutex); | |
211 | ||
212 | return count; | |
213 | } | |
214 | ||
215 | static DEVICE_ATTR_RW(xfer_mode); | |
216 | ||
50a6620d WZ |
217 | static struct attribute *bcm63xx_hsspi_attrs[] = { |
218 | &dev_attr_wait_mode.attr, | |
b7a82103 | 219 | &dev_attr_xfer_mode.attr, |
50a6620d WZ |
220 | NULL, |
221 | }; | |
222 | ||
223 | static const struct attribute_group bcm63xx_hsspi_group = { | |
224 | .attrs = bcm63xx_hsspi_attrs, | |
142168eb JG |
225 | }; |
226 | ||
b7a82103 WZ |
227 | static void bcm63xx_hsspi_set_clk(struct bcm63xx_hsspi *bs, |
228 | struct spi_device *spi, int hz); | |
229 | ||
230 | static size_t bcm63xx_hsspi_max_message_size(struct spi_device *spi) | |
231 | { | |
232 | return HSSPI_BUFFER_LEN - HSSPI_OPCODE_LEN; | |
233 | } | |
234 | ||
235 | static int bcm63xx_hsspi_wait_cmd(struct bcm63xx_hsspi *bs) | |
236 | { | |
237 | unsigned long limit; | |
238 | u32 reg = 0; | |
239 | int rc = 0; | |
240 | ||
241 | if (bs->wait_mode == HSSPI_WAIT_MODE_INTR) { | |
242 | if (wait_for_completion_timeout(&bs->done, HZ) == 0) | |
243 | rc = 1; | |
244 | } else { | |
245 | /* polling mode checks for status busy bit */ | |
246 | limit = jiffies + msecs_to_jiffies(HSSPI_POLL_STATUS_TIMEOUT_MS); | |
247 | ||
248 | while (!time_after(jiffies, limit)) { | |
249 | reg = __raw_readl(bs->regs + HSSPI_PINGPONG_STATUS_REG(0)); | |
250 | if (reg & HSSPI_PINGPONG_STATUS_SRC_BUSY) | |
251 | cpu_relax(); | |
252 | else | |
253 | break; | |
254 | } | |
255 | if (reg & HSSPI_PINGPONG_STATUS_SRC_BUSY) | |
256 | rc = 1; | |
257 | } | |
258 | ||
259 | if (rc) | |
260 | dev_err(&bs->pdev->dev, "transfer timed out!\n"); | |
261 | ||
262 | return rc; | |
263 | } | |
264 | ||
2c40be6b | 265 | static bool bcm63xx_prepare_prepend_transfer(struct spi_controller *host, |
b7a82103 WZ |
266 | struct spi_message *msg, |
267 | struct spi_transfer *t_prepend) | |
268 | { | |
269 | ||
2c40be6b | 270 | struct bcm63xx_hsspi *bs = spi_controller_get_devdata(host); |
b7a82103 WZ |
271 | bool tx_only = false; |
272 | struct spi_transfer *t; | |
273 | ||
274 | /* | |
275 | * Multiple transfers within a message may be combined into one transfer | |
276 | * to the controller using its prepend feature. A SPI message is prependable | |
277 | * only if the following are all true: | |
278 | * 1. One or more half duplex write transfer in single bit mode | |
279 | * 2. Optional full duplex read/write at the end | |
280 | * 3. No delay and cs_change between transfers | |
281 | */ | |
282 | bs->prepend_cnt = 0; | |
283 | list_for_each_entry(t, &msg->transfers, transfer_list) { | |
284 | if ((spi_delay_to_ns(&t->delay, t) > 0) || t->cs_change) { | |
285 | bcm63xx_prepend_printk_on_checkfail(bs, | |
286 | "Delay or cs change not supported in prepend mode!\n"); | |
287 | return false; | |
288 | } | |
289 | ||
290 | tx_only = false; | |
291 | if (t->tx_buf && !t->rx_buf) { | |
292 | tx_only = true; | |
293 | if (bs->prepend_cnt + t->len > | |
294 | (HSSPI_BUFFER_LEN - HSSPI_OPCODE_LEN)) { | |
295 | bcm63xx_prepend_printk_on_checkfail(bs, | |
296 | "exceed max buf len, abort prepending transfers!\n"); | |
297 | return false; | |
298 | } | |
299 | ||
300 | if (t->tx_nbits > SPI_NBITS_SINGLE && | |
301 | !list_is_last(&t->transfer_list, &msg->transfers)) { | |
302 | bcm63xx_prepend_printk_on_checkfail(bs, | |
303 | "multi-bit prepend buf not supported!\n"); | |
304 | return false; | |
305 | } | |
306 | ||
307 | if (t->tx_nbits == SPI_NBITS_SINGLE) { | |
308 | memcpy(bs->prepend_buf + bs->prepend_cnt, t->tx_buf, t->len); | |
309 | bs->prepend_cnt += t->len; | |
310 | } | |
311 | } else { | |
312 | if (!list_is_last(&t->transfer_list, &msg->transfers)) { | |
313 | bcm63xx_prepend_printk_on_checkfail(bs, | |
314 | "rx/tx_rx transfer not supported when it is not last one!\n"); | |
315 | return false; | |
316 | } | |
317 | } | |
318 | ||
319 | if (list_is_last(&t->transfer_list, &msg->transfers)) { | |
320 | memcpy(t_prepend, t, sizeof(struct spi_transfer)); | |
321 | ||
322 | if (tx_only && t->tx_nbits == SPI_NBITS_SINGLE) { | |
323 | /* | |
324 | * if the last one is also a single bit tx only transfer, merge | |
325 | * all of them into one single tx transfer | |
326 | */ | |
327 | t_prepend->len = bs->prepend_cnt; | |
328 | t_prepend->tx_buf = bs->prepend_buf; | |
329 | bs->prepend_cnt = 0; | |
330 | } else { | |
331 | /* | |
332 | * if the last one is not a tx only transfer or dual tx xfer, all | |
333 | * the previous transfers are sent through prepend bytes and | |
334 | * make sure it does not exceed the max prepend len | |
335 | */ | |
336 | if (bs->prepend_cnt > HSSPI_MAX_PREPEND_LEN) { | |
337 | bcm63xx_prepend_printk_on_checkfail(bs, | |
338 | "exceed max prepend len, abort prepending transfers!\n"); | |
339 | return false; | |
340 | } | |
341 | } | |
342 | } | |
343 | } | |
344 | ||
345 | return true; | |
346 | } | |
347 | ||
348 | static int bcm63xx_hsspi_do_prepend_txrx(struct spi_device *spi, | |
349 | struct spi_transfer *t) | |
350 | { | |
2c40be6b | 351 | struct bcm63xx_hsspi *bs = spi_controller_get_devdata(spi->controller); |
9e264f3f | 352 | unsigned int chip_select = spi_get_chipselect(spi, 0); |
2cca486c | 353 | u16 opcode = 0, val; |
b7a82103 WZ |
354 | const u8 *tx = t->tx_buf; |
355 | u8 *rx = t->rx_buf; | |
356 | u32 reg = 0; | |
357 | ||
358 | /* | |
359 | * shouldn't happen as we set the max_message_size in the probe. | |
360 | * but check it again in case some driver does not honor the max size | |
361 | */ | |
362 | if (t->len + bs->prepend_cnt > (HSSPI_BUFFER_LEN - HSSPI_OPCODE_LEN)) { | |
363 | dev_warn(&bs->pdev->dev, | |
364 | "Prepend message large than fifo size len %d prepend %d\n", | |
365 | t->len, bs->prepend_cnt); | |
366 | return -EINVAL; | |
367 | } | |
368 | ||
369 | bcm63xx_hsspi_set_clk(bs, spi, t->speed_hz); | |
370 | ||
371 | if (tx && rx) | |
372 | opcode = HSSPI_OP_READ_WRITE; | |
373 | else if (tx) | |
374 | opcode = HSSPI_OP_WRITE; | |
375 | else if (rx) | |
376 | opcode = HSSPI_OP_READ; | |
377 | ||
378 | if ((opcode == HSSPI_OP_READ && t->rx_nbits == SPI_NBITS_DUAL) || | |
379 | (opcode == HSSPI_OP_WRITE && t->tx_nbits == SPI_NBITS_DUAL)) { | |
380 | opcode |= HSSPI_OP_MULTIBIT; | |
381 | ||
382 | if (t->rx_nbits == SPI_NBITS_DUAL) { | |
383 | reg |= 1 << MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT; | |
384 | reg |= bs->prepend_cnt << MODE_CTRL_MULTIDATA_RD_STRT_SHIFT; | |
385 | } | |
386 | if (t->tx_nbits == SPI_NBITS_DUAL) { | |
387 | reg |= 1 << MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT; | |
388 | reg |= bs->prepend_cnt << MODE_CTRL_MULTIDATA_WR_STRT_SHIFT; | |
389 | } | |
390 | } | |
391 | ||
392 | reg |= bs->prepend_cnt << MODE_CTRL_PREPENDBYTE_CNT_SHIFT; | |
393 | __raw_writel(reg | 0xff, | |
394 | bs->regs + HSSPI_PROFILE_MODE_CTRL_REG(chip_select)); | |
395 | ||
396 | reinit_completion(&bs->done); | |
397 | if (bs->prepend_cnt) | |
398 | memcpy_toio(bs->fifo + HSSPI_OPCODE_LEN, bs->prepend_buf, | |
399 | bs->prepend_cnt); | |
400 | if (tx) | |
401 | memcpy_toio(bs->fifo + HSSPI_OPCODE_LEN + bs->prepend_cnt, tx, | |
402 | t->len); | |
403 | ||
2cca486c WZ |
404 | *(__be16 *)(&val) = cpu_to_be16(opcode | t->len); |
405 | __raw_writew(val, bs->fifo); | |
b7a82103 WZ |
406 | /* enable interrupt */ |
407 | if (bs->wait_mode == HSSPI_WAIT_MODE_INTR) | |
408 | __raw_writel(HSSPI_PINGx_CMD_DONE(0), bs->regs + HSSPI_INT_MASK_REG); | |
409 | ||
410 | /* start the transfer */ | |
411 | reg = chip_select << PINGPONG_CMD_SS_SHIFT | | |
412 | chip_select << PINGPONG_CMD_PROFILE_SHIFT | | |
413 | PINGPONG_COMMAND_START_NOW; | |
414 | __raw_writel(reg, bs->regs + HSSPI_PINGPONG_COMMAND_REG(0)); | |
415 | ||
416 | if (bcm63xx_hsspi_wait_cmd(bs)) | |
417 | return -ETIMEDOUT; | |
418 | ||
419 | if (rx) | |
420 | memcpy_fromio(rx, bs->fifo, t->len); | |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
c3c25ea7 | 425 | static void bcm63xx_hsspi_set_cs(struct bcm63xx_hsspi *bs, unsigned int cs, |
142168eb JG |
426 | bool active) |
427 | { | |
428 | u32 reg; | |
429 | ||
430 | mutex_lock(&bs->bus_mutex); | |
431 | reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); | |
432 | ||
433 | reg &= ~BIT(cs); | |
434 | if (active == !(bs->cs_polarity & BIT(cs))) | |
435 | reg |= BIT(cs); | |
436 | ||
437 | __raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG); | |
438 | mutex_unlock(&bs->bus_mutex); | |
439 | } | |
440 | ||
441 | static void bcm63xx_hsspi_set_clk(struct bcm63xx_hsspi *bs, | |
442 | struct spi_device *spi, int hz) | |
443 | { | |
9e264f3f | 444 | unsigned int profile = spi_get_chipselect(spi, 0); |
142168eb JG |
445 | u32 reg; |
446 | ||
447 | reg = DIV_ROUND_UP(2048, DIV_ROUND_UP(bs->speed_hz, hz)); | |
448 | __raw_writel(CLK_CTRL_ACCUM_RST_ON_LOOP | reg, | |
449 | bs->regs + HSSPI_PROFILE_CLK_CTRL_REG(profile)); | |
450 | ||
451 | reg = __raw_readl(bs->regs + HSSPI_PROFILE_SIGNAL_CTRL_REG(profile)); | |
452 | if (hz > HSSPI_MAX_SYNC_CLOCK) | |
453 | reg |= SIGNAL_CTRL_ASYNC_INPUT_PATH; | |
454 | else | |
455 | reg &= ~SIGNAL_CTRL_ASYNC_INPUT_PATH; | |
456 | __raw_writel(reg, bs->regs + HSSPI_PROFILE_SIGNAL_CTRL_REG(profile)); | |
457 | ||
458 | mutex_lock(&bs->bus_mutex); | |
459 | /* setup clock polarity */ | |
460 | reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); | |
461 | reg &= ~GLOBAL_CTRL_CLK_POLARITY; | |
462 | if (spi->mode & SPI_CPOL) | |
463 | reg |= GLOBAL_CTRL_CLK_POLARITY; | |
464 | __raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG); | |
465 | mutex_unlock(&bs->bus_mutex); | |
466 | } | |
467 | ||
468 | static int bcm63xx_hsspi_do_txrx(struct spi_device *spi, struct spi_transfer *t) | |
469 | { | |
2c40be6b | 470 | struct bcm63xx_hsspi *bs = spi_controller_get_devdata(spi->controller); |
9e264f3f | 471 | unsigned int chip_select = spi_get_chipselect(spi, 0); |
2cca486c | 472 | u16 opcode = 0, val; |
142168eb JG |
473 | int pending = t->len; |
474 | int step_size = HSSPI_BUFFER_LEN; | |
475 | const u8 *tx = t->tx_buf; | |
476 | u8 *rx = t->rx_buf; | |
b7a82103 | 477 | u32 reg = 0; |
142168eb JG |
478 | |
479 | bcm63xx_hsspi_set_clk(bs, spi, t->speed_hz); | |
c00d5e93 | 480 | if (!t->cs_off) |
9e264f3f | 481 | bcm63xx_hsspi_set_cs(bs, spi_get_chipselect(spi, 0), true); |
142168eb JG |
482 | |
483 | if (tx && rx) | |
484 | opcode = HSSPI_OP_READ_WRITE; | |
485 | else if (tx) | |
486 | opcode = HSSPI_OP_WRITE; | |
487 | else if (rx) | |
488 | opcode = HSSPI_OP_READ; | |
489 | ||
490 | if (opcode != HSSPI_OP_READ) | |
491 | step_size -= HSSPI_OPCODE_LEN; | |
492 | ||
f4d86223 | 493 | if ((opcode == HSSPI_OP_READ && t->rx_nbits == SPI_NBITS_DUAL) || |
811ff802 | 494 | (opcode == HSSPI_OP_WRITE && t->tx_nbits == SPI_NBITS_DUAL)) { |
f4d86223 JG |
495 | opcode |= HSSPI_OP_MULTIBIT; |
496 | ||
811ff802 | 497 | if (t->rx_nbits == SPI_NBITS_DUAL) |
b7a82103 | 498 | reg |= 1 << MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT; |
811ff802 | 499 | if (t->tx_nbits == SPI_NBITS_DUAL) |
b7a82103 | 500 | reg |= 1 << MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT; |
811ff802 WZ |
501 | } |
502 | ||
b7a82103 | 503 | __raw_writel(reg | 0xff, |
142168eb JG |
504 | bs->regs + HSSPI_PROFILE_MODE_CTRL_REG(chip_select)); |
505 | ||
506 | while (pending > 0) { | |
507 | int curr_step = min_t(int, step_size, pending); | |
508 | ||
aa0fe826 | 509 | reinit_completion(&bs->done); |
142168eb JG |
510 | if (tx) { |
511 | memcpy_toio(bs->fifo + HSSPI_OPCODE_LEN, tx, curr_step); | |
512 | tx += curr_step; | |
513 | } | |
514 | ||
2cca486c WZ |
515 | *(__be16 *)(&val) = cpu_to_be16(opcode | curr_step); |
516 | __raw_writew(val, bs->fifo); | |
142168eb JG |
517 | |
518 | /* enable interrupt */ | |
50a6620d WZ |
519 | if (bs->wait_mode == HSSPI_WAIT_MODE_INTR) |
520 | __raw_writel(HSSPI_PINGx_CMD_DONE(0), | |
521 | bs->regs + HSSPI_INT_MASK_REG); | |
142168eb | 522 | |
b7a82103 WZ |
523 | reg = !chip_select << PINGPONG_CMD_SS_SHIFT | |
524 | chip_select << PINGPONG_CMD_PROFILE_SHIFT | | |
525 | PINGPONG_COMMAND_START_NOW; | |
526 | __raw_writel(reg, bs->regs + HSSPI_PINGPONG_COMMAND_REG(0)); | |
142168eb | 527 | |
b7a82103 WZ |
528 | if (bcm63xx_hsspi_wait_cmd(bs)) |
529 | return -ETIMEDOUT; | |
142168eb JG |
530 | |
531 | if (rx) { | |
532 | memcpy_fromio(rx, bs->fifo, curr_step); | |
533 | rx += curr_step; | |
534 | } | |
535 | ||
536 | pending -= curr_step; | |
537 | } | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
542 | static int bcm63xx_hsspi_setup(struct spi_device *spi) | |
543 | { | |
2c40be6b | 544 | struct bcm63xx_hsspi *bs = spi_controller_get_devdata(spi->controller); |
142168eb JG |
545 | u32 reg; |
546 | ||
547 | reg = __raw_readl(bs->regs + | |
9e264f3f | 548 | HSSPI_PROFILE_SIGNAL_CTRL_REG(spi_get_chipselect(spi, 0))); |
142168eb JG |
549 | reg &= ~(SIGNAL_CTRL_LAUNCH_RISING | SIGNAL_CTRL_LATCH_RISING); |
550 | if (spi->mode & SPI_CPHA) | |
551 | reg |= SIGNAL_CTRL_LAUNCH_RISING; | |
552 | else | |
553 | reg |= SIGNAL_CTRL_LATCH_RISING; | |
554 | __raw_writel(reg, bs->regs + | |
9e264f3f | 555 | HSSPI_PROFILE_SIGNAL_CTRL_REG(spi_get_chipselect(spi, 0))); |
142168eb JG |
556 | |
557 | mutex_lock(&bs->bus_mutex); | |
558 | reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); | |
559 | ||
560 | /* only change actual polarities if there is no transfer */ | |
561 | if ((reg & GLOBAL_CTRL_CS_POLARITY_MASK) == bs->cs_polarity) { | |
562 | if (spi->mode & SPI_CS_HIGH) | |
9e264f3f | 563 | reg |= BIT(spi_get_chipselect(spi, 0)); |
142168eb | 564 | else |
9e264f3f | 565 | reg &= ~BIT(spi_get_chipselect(spi, 0)); |
142168eb JG |
566 | __raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG); |
567 | } | |
568 | ||
569 | if (spi->mode & SPI_CS_HIGH) | |
9e264f3f | 570 | bs->cs_polarity |= BIT(spi_get_chipselect(spi, 0)); |
142168eb | 571 | else |
9e264f3f | 572 | bs->cs_polarity &= ~BIT(spi_get_chipselect(spi, 0)); |
142168eb JG |
573 | |
574 | mutex_unlock(&bs->bus_mutex); | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
b7a82103 | 579 | static int bcm63xx_hsspi_do_dummy_cs_txrx(struct spi_device *spi, |
142168eb JG |
580 | struct spi_message *msg) |
581 | { | |
2c40be6b | 582 | struct bcm63xx_hsspi *bs = spi_controller_get_devdata(spi->controller); |
142168eb JG |
583 | int status = -EINVAL; |
584 | int dummy_cs; | |
c00d5e93 | 585 | bool keep_cs = false; |
b7a82103 | 586 | struct spi_transfer *t; |
142168eb | 587 | |
b7a82103 WZ |
588 | /* |
589 | * This controller does not support keeping CS active during idle. | |
142168eb JG |
590 | * To work around this, we use the following ugly hack: |
591 | * | |
592 | * a. Invert the target chip select's polarity so it will be active. | |
593 | * b. Select a "dummy" chip select to use as the hardware target. | |
594 | * c. Invert the dummy chip select's polarity so it will be inactive | |
595 | * during the actual transfers. | |
596 | * d. Tell the hardware to send to the dummy chip select. Thanks to | |
597 | * the multiplexed nature of SPI the actual target will receive | |
598 | * the transfer and we see its response. | |
599 | * | |
600 | * e. At the end restore the polarities again to their default values. | |
601 | */ | |
602 | ||
9e264f3f | 603 | dummy_cs = !spi_get_chipselect(spi, 0); |
142168eb JG |
604 | bcm63xx_hsspi_set_cs(bs, dummy_cs, true); |
605 | ||
606 | list_for_each_entry(t, &msg->transfers, transfer_list) { | |
b7a82103 WZ |
607 | /* |
608 | * We are here because one of reasons below: | |
609 | * a. Message is not prependable and in default auto xfer mode. This mean | |
610 | * we fallback to dummy cs mode at maximum 25MHz safe clock rate. | |
611 | * b. User set to use the dummy cs mode. | |
612 | */ | |
613 | if (bs->xfer_mode == HSSPI_XFER_MODE_AUTO) { | |
614 | if (t->speed_hz > HSSPI_MAX_SYNC_CLOCK) { | |
615 | t->speed_hz = HSSPI_MAX_SYNC_CLOCK; | |
616 | dev_warn_once(&bs->pdev->dev, | |
617 | "Force to dummy cs mode. Reduce the speed to %dHz", | |
618 | t->speed_hz); | |
619 | } | |
620 | } | |
621 | ||
142168eb JG |
622 | status = bcm63xx_hsspi_do_txrx(spi, t); |
623 | if (status) | |
624 | break; | |
625 | ||
626 | msg->actual_length += t->len; | |
627 | ||
e74dc5c7 | 628 | spi_transfer_delay_exec(t); |
142168eb | 629 | |
c00d5e93 WZ |
630 | /* use existing cs change logic from spi_transfer_one_message */ |
631 | if (t->cs_change) { | |
632 | if (list_is_last(&t->transfer_list, &msg->transfers)) { | |
633 | keep_cs = true; | |
634 | } else { | |
635 | if (!t->cs_off) | |
9e264f3f | 636 | bcm63xx_hsspi_set_cs(bs, spi_get_chipselect(spi, 0), false); |
c00d5e93 WZ |
637 | |
638 | spi_transfer_cs_change_delay_exec(msg, t); | |
639 | ||
640 | if (!list_next_entry(t, transfer_list)->cs_off) | |
9e264f3f | 641 | bcm63xx_hsspi_set_cs(bs, spi_get_chipselect(spi, 0), true); |
c00d5e93 WZ |
642 | } |
643 | } else if (!list_is_last(&t->transfer_list, &msg->transfers) && | |
644 | t->cs_off != list_next_entry(t, transfer_list)->cs_off) { | |
9e264f3f | 645 | bcm63xx_hsspi_set_cs(bs, spi_get_chipselect(spi, 0), t->cs_off); |
c00d5e93 | 646 | } |
142168eb JG |
647 | } |
648 | ||
c00d5e93 WZ |
649 | bcm63xx_hsspi_set_cs(bs, dummy_cs, false); |
650 | if (status || !keep_cs) | |
9e264f3f | 651 | bcm63xx_hsspi_set_cs(bs, spi_get_chipselect(spi, 0), false); |
142168eb | 652 | |
b7a82103 WZ |
653 | return status; |
654 | } | |
655 | ||
2c40be6b | 656 | static int bcm63xx_hsspi_transfer_one(struct spi_controller *host, |
b7a82103 WZ |
657 | struct spi_message *msg) |
658 | { | |
2c40be6b | 659 | struct bcm63xx_hsspi *bs = spi_controller_get_devdata(host); |
b7a82103 WZ |
660 | struct spi_device *spi = msg->spi; |
661 | int status = -EINVAL; | |
662 | bool prependable = false; | |
663 | struct spi_transfer t_prepend; | |
664 | ||
665 | mutex_lock(&bs->msg_mutex); | |
666 | ||
667 | if (bs->xfer_mode != HSSPI_XFER_MODE_DUMMYCS) | |
2c40be6b | 668 | prependable = bcm63xx_prepare_prepend_transfer(host, msg, &t_prepend); |
b7a82103 WZ |
669 | |
670 | if (prependable) { | |
671 | status = bcm63xx_hsspi_do_prepend_txrx(spi, &t_prepend); | |
672 | msg->actual_length = (t_prepend.len + bs->prepend_cnt); | |
673 | } else { | |
674 | if (bs->xfer_mode == HSSPI_XFER_MODE_PREPEND) { | |
675 | dev_err(&bs->pdev->dev, | |
676 | "User sets prepend mode but msg not prependable! Abort transfer\n"); | |
677 | status = -EINVAL; | |
678 | } else | |
679 | status = bcm63xx_hsspi_do_dummy_cs_txrx(spi, msg); | |
680 | } | |
681 | ||
50a6620d | 682 | mutex_unlock(&bs->msg_mutex); |
142168eb | 683 | msg->status = status; |
2c40be6b | 684 | spi_finalize_current_message(host); |
142168eb JG |
685 | |
686 | return 0; | |
687 | } | |
688 | ||
c6182a18 WZ |
689 | static bool bcm63xx_hsspi_mem_supports_op(struct spi_mem *mem, |
690 | const struct spi_mem_op *op) | |
691 | { | |
692 | if (!spi_mem_default_supports_op(mem, op)) | |
693 | return false; | |
694 | ||
695 | /* Controller doesn't support spi mem dual io mode */ | |
696 | if ((op->cmd.opcode == SPINOR_OP_READ_1_2_2) || | |
697 | (op->cmd.opcode == SPINOR_OP_READ_1_2_2_4B) || | |
698 | (op->cmd.opcode == SPINOR_OP_READ_1_2_2_DTR) || | |
699 | (op->cmd.opcode == SPINOR_OP_READ_1_2_2_DTR_4B)) | |
700 | return false; | |
701 | ||
702 | return true; | |
703 | } | |
704 | ||
705 | static const struct spi_controller_mem_ops bcm63xx_hsspi_mem_ops = { | |
706 | .supports_op = bcm63xx_hsspi_mem_supports_op, | |
707 | }; | |
708 | ||
142168eb JG |
709 | static irqreturn_t bcm63xx_hsspi_interrupt(int irq, void *dev_id) |
710 | { | |
711 | struct bcm63xx_hsspi *bs = (struct bcm63xx_hsspi *)dev_id; | |
712 | ||
713 | if (__raw_readl(bs->regs + HSSPI_INT_STATUS_MASKED_REG) == 0) | |
714 | return IRQ_NONE; | |
715 | ||
716 | __raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG); | |
717 | __raw_writel(0, bs->regs + HSSPI_INT_MASK_REG); | |
718 | ||
719 | complete(&bs->done); | |
720 | ||
721 | return IRQ_HANDLED; | |
722 | } | |
723 | ||
724 | static int bcm63xx_hsspi_probe(struct platform_device *pdev) | |
725 | { | |
2c40be6b | 726 | struct spi_controller *host; |
142168eb | 727 | struct bcm63xx_hsspi *bs; |
142168eb JG |
728 | void __iomem *regs; |
729 | struct device *dev = &pdev->dev; | |
0fd85869 | 730 | struct clk *clk, *pll_clk = NULL; |
142168eb | 731 | int irq, ret; |
7ab24635 | 732 | u32 reg, rate, num_cs = HSSPI_SPI_MAX_CS; |
0eeadddb | 733 | struct reset_control *reset; |
142168eb JG |
734 | |
735 | irq = platform_get_irq(pdev, 0); | |
6b8ac10e | 736 | if (irq < 0) |
378da4a6 | 737 | return irq; |
142168eb | 738 | |
e364c8c2 | 739 | regs = devm_platform_ioremap_resource(pdev, 0); |
142168eb JG |
740 | if (IS_ERR(regs)) |
741 | return PTR_ERR(regs); | |
742 | ||
b1bdd4f8 | 743 | clk = devm_clk_get(dev, "hsspi"); |
142168eb JG |
744 | |
745 | if (IS_ERR(clk)) | |
746 | return PTR_ERR(clk); | |
747 | ||
0eeadddb ÁFR |
748 | reset = devm_reset_control_get_optional_exclusive(dev, NULL); |
749 | if (IS_ERR(reset)) | |
750 | return PTR_ERR(reset); | |
751 | ||
0d7412ed SP |
752 | ret = clk_prepare_enable(clk); |
753 | if (ret) | |
754 | return ret; | |
755 | ||
0eeadddb ÁFR |
756 | ret = reset_control_reset(reset); |
757 | if (ret) { | |
758 | dev_err(dev, "unable to reset device: %d\n", ret); | |
759 | goto out_disable_clk; | |
760 | } | |
761 | ||
142168eb | 762 | rate = clk_get_rate(clk); |
ff18e1ef | 763 | if (!rate) { |
0fd85869 | 764 | pll_clk = devm_clk_get(dev, "pll"); |
ff18e1ef | 765 | |
0d7412ed SP |
766 | if (IS_ERR(pll_clk)) { |
767 | ret = PTR_ERR(pll_clk); | |
768 | goto out_disable_clk; | |
769 | } | |
770 | ||
771 | ret = clk_prepare_enable(pll_clk); | |
772 | if (ret) | |
773 | goto out_disable_clk; | |
ff18e1ef JG |
774 | |
775 | rate = clk_get_rate(pll_clk); | |
0d7412ed SP |
776 | if (!rate) { |
777 | ret = -EINVAL; | |
0fd85869 | 778 | goto out_disable_pll_clk; |
0d7412ed | 779 | } |
ff18e1ef | 780 | } |
142168eb | 781 | |
2c40be6b YY |
782 | host = spi_alloc_host(&pdev->dev, sizeof(*bs)); |
783 | if (!host) { | |
142168eb | 784 | ret = -ENOMEM; |
0fd85869 | 785 | goto out_disable_pll_clk; |
142168eb JG |
786 | } |
787 | ||
2c40be6b | 788 | bs = spi_controller_get_devdata(host); |
142168eb JG |
789 | bs->pdev = pdev; |
790 | bs->clk = clk; | |
0fd85869 | 791 | bs->pll_clk = pll_clk; |
142168eb JG |
792 | bs->regs = regs; |
793 | bs->speed_hz = rate; | |
794 | bs->fifo = (u8 __iomem *)(bs->regs + HSSPI_FIFO_REG(0)); | |
50a6620d | 795 | bs->wait_mode = HSSPI_WAIT_MODE_POLLING; |
b7a82103 WZ |
796 | bs->prepend_buf = devm_kzalloc(dev, HSSPI_BUFFER_LEN, GFP_KERNEL); |
797 | if (!bs->prepend_buf) { | |
798 | ret = -ENOMEM; | |
2c40be6b | 799 | goto out_put_host; |
b7a82103 | 800 | } |
142168eb JG |
801 | |
802 | mutex_init(&bs->bus_mutex); | |
50a6620d | 803 | mutex_init(&bs->msg_mutex); |
aa0fe826 | 804 | init_completion(&bs->done); |
142168eb | 805 | |
2c40be6b YY |
806 | host->mem_ops = &bcm63xx_hsspi_mem_ops; |
807 | host->dev.of_node = dev->of_node; | |
7ab24635 | 808 | if (!dev->of_node) |
2c40be6b | 809 | host->bus_num = HSSPI_BUS_NUM; |
7ab24635 JG |
810 | |
811 | of_property_read_u32(dev->of_node, "num-cs", &num_cs); | |
812 | if (num_cs > 8) { | |
813 | dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n", | |
814 | num_cs); | |
815 | num_cs = HSSPI_SPI_MAX_CS; | |
816 | } | |
2c40be6b YY |
817 | host->num_chipselect = num_cs; |
818 | host->setup = bcm63xx_hsspi_setup; | |
819 | host->transfer_one_message = bcm63xx_hsspi_transfer_one; | |
820 | host->max_transfer_size = bcm63xx_hsspi_max_message_size; | |
821 | host->max_message_size = bcm63xx_hsspi_max_message_size; | |
b7a82103 | 822 | |
2c40be6b | 823 | host->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | |
f4d86223 | 824 | SPI_RX_DUAL | SPI_TX_DUAL; |
2c40be6b YY |
825 | host->bits_per_word_mask = SPI_BPW_MASK(8); |
826 | host->auto_runtime_pm = true; | |
142168eb | 827 | |
2c40be6b | 828 | platform_set_drvdata(pdev, host); |
142168eb JG |
829 | |
830 | /* Initialize the hardware */ | |
831 | __raw_writel(0, bs->regs + HSSPI_INT_MASK_REG); | |
832 | ||
833 | /* clean up any pending interrupts */ | |
834 | __raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG); | |
835 | ||
836 | /* read out default CS polarities */ | |
837 | reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); | |
838 | bs->cs_polarity = reg & GLOBAL_CTRL_CS_POLARITY_MASK; | |
839 | __raw_writel(reg | GLOBAL_CTRL_CLK_GATE_SSOFF, | |
840 | bs->regs + HSSPI_GLOBAL_CTRL_REG); | |
841 | ||
50a6620d WZ |
842 | if (irq > 0) { |
843 | ret = devm_request_irq(dev, irq, bcm63xx_hsspi_interrupt, IRQF_SHARED, | |
844 | pdev->name, bs); | |
142168eb | 845 | |
50a6620d | 846 | if (ret) |
2c40be6b | 847 | goto out_put_host; |
50a6620d | 848 | } |
142168eb | 849 | |
fb8695e3 ÁFR |
850 | pm_runtime_enable(&pdev->dev); |
851 | ||
97b7cea0 DC |
852 | ret = sysfs_create_group(&pdev->dev.kobj, &bcm63xx_hsspi_group); |
853 | if (ret) { | |
50a6620d WZ |
854 | dev_err(&pdev->dev, "couldn't register sysfs group\n"); |
855 | goto out_pm_disable; | |
856 | } | |
857 | ||
142168eb | 858 | /* register and we are done */ |
2c40be6b | 859 | ret = devm_spi_register_controller(dev, host); |
142168eb | 860 | if (ret) |
50a6620d WZ |
861 | goto out_sysgroup_disable; |
862 | ||
863 | dev_info(dev, "Broadcom 63XX High Speed SPI Controller driver"); | |
142168eb JG |
864 | |
865 | return 0; | |
866 | ||
50a6620d WZ |
867 | out_sysgroup_disable: |
868 | sysfs_remove_group(&pdev->dev.kobj, &bcm63xx_hsspi_group); | |
fb8695e3 ÁFR |
869 | out_pm_disable: |
870 | pm_runtime_disable(&pdev->dev); | |
2c40be6b YY |
871 | out_put_host: |
872 | spi_controller_put(host); | |
0fd85869 JG |
873 | out_disable_pll_clk: |
874 | clk_disable_unprepare(pll_clk); | |
142168eb JG |
875 | out_disable_clk: |
876 | clk_disable_unprepare(clk); | |
142168eb JG |
877 | return ret; |
878 | } | |
879 | ||
880 | ||
04cd5f3f | 881 | static void bcm63xx_hsspi_remove(struct platform_device *pdev) |
142168eb | 882 | { |
2c40be6b YY |
883 | struct spi_controller *host = platform_get_drvdata(pdev); |
884 | struct bcm63xx_hsspi *bs = spi_controller_get_devdata(host); | |
142168eb | 885 | |
142168eb JG |
886 | /* reset the hardware and block queue progress */ |
887 | __raw_writel(0, bs->regs + HSSPI_INT_MASK_REG); | |
0fd85869 | 888 | clk_disable_unprepare(bs->pll_clk); |
142168eb | 889 | clk_disable_unprepare(bs->clk); |
50a6620d | 890 | sysfs_remove_group(&pdev->dev.kobj, &bcm63xx_hsspi_group); |
142168eb JG |
891 | } |
892 | ||
937ebf9c | 893 | #ifdef CONFIG_PM_SLEEP |
142168eb JG |
894 | static int bcm63xx_hsspi_suspend(struct device *dev) |
895 | { | |
2c40be6b YY |
896 | struct spi_controller *host = dev_get_drvdata(dev); |
897 | struct bcm63xx_hsspi *bs = spi_controller_get_devdata(host); | |
142168eb | 898 | |
2c40be6b | 899 | spi_controller_suspend(host); |
0fd85869 | 900 | clk_disable_unprepare(bs->pll_clk); |
937ebf9c | 901 | clk_disable_unprepare(bs->clk); |
142168eb JG |
902 | |
903 | return 0; | |
904 | } | |
905 | ||
906 | static int bcm63xx_hsspi_resume(struct device *dev) | |
907 | { | |
2c40be6b YY |
908 | struct spi_controller *host = dev_get_drvdata(dev); |
909 | struct bcm63xx_hsspi *bs = spi_controller_get_devdata(host); | |
937ebf9c JG |
910 | int ret; |
911 | ||
912 | ret = clk_prepare_enable(bs->clk); | |
913 | if (ret) | |
914 | return ret; | |
142168eb | 915 | |
0fd85869 JG |
916 | if (bs->pll_clk) { |
917 | ret = clk_prepare_enable(bs->pll_clk); | |
9bb9ef2b QM |
918 | if (ret) { |
919 | clk_disable_unprepare(bs->clk); | |
0fd85869 | 920 | return ret; |
9bb9ef2b | 921 | } |
0fd85869 JG |
922 | } |
923 | ||
2c40be6b | 924 | spi_controller_resume(host); |
142168eb JG |
925 | |
926 | return 0; | |
927 | } | |
937ebf9c | 928 | #endif |
142168eb | 929 | |
1480916e JH |
930 | static SIMPLE_DEV_PM_OPS(bcm63xx_hsspi_pm_ops, bcm63xx_hsspi_suspend, |
931 | bcm63xx_hsspi_resume); | |
142168eb | 932 | |
7ab24635 JG |
933 | static const struct of_device_id bcm63xx_hsspi_of_match[] = { |
934 | { .compatible = "brcm,bcm6328-hsspi", }, | |
99d7428a | 935 | { .compatible = "brcm,bcmbca-hsspi-v1.0", }, |
7ab24635 JG |
936 | { }, |
937 | }; | |
0b85a842 | 938 | MODULE_DEVICE_TABLE(of, bcm63xx_hsspi_of_match); |
7ab24635 | 939 | |
142168eb JG |
940 | static struct platform_driver bcm63xx_hsspi_driver = { |
941 | .driver = { | |
942 | .name = "bcm63xx-hsspi", | |
937ebf9c | 943 | .pm = &bcm63xx_hsspi_pm_ops, |
7ab24635 | 944 | .of_match_table = bcm63xx_hsspi_of_match, |
142168eb JG |
945 | }, |
946 | .probe = bcm63xx_hsspi_probe, | |
04cd5f3f | 947 | .remove_new = bcm63xx_hsspi_remove, |
142168eb JG |
948 | }; |
949 | ||
950 | module_platform_driver(bcm63xx_hsspi_driver); | |
951 | ||
952 | MODULE_ALIAS("platform:bcm63xx_hsspi"); | |
953 | MODULE_DESCRIPTION("Broadcom BCM63xx High Speed SPI Controller driver"); | |
954 | MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>"); | |
955 | MODULE_LICENSE("GPL"); |