1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Broadcom BCMBCA High Speed SPI Controller driver
4  *
5  * Copyright 2000-2010 Broadcom Corporation
6  * Copyright 2012-2013 Jonas Gorski <jonas.gorski@gmail.com>
7  * Copyright 2019-2022 Broadcom Ltd
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>
21 #include <linux/mutex.h>
22 #include <linux/of.h>
23 #include <linux/spi/spi-mem.h>
24 #include <linux/pm_runtime.h>
25 
26 #define HSSPI_GLOBAL_CTRL_REG			0x0
27 #define GLOBAL_CTRL_CS_POLARITY_SHIFT		0
28 #define GLOBAL_CTRL_CS_POLARITY_MASK		0x000000ff
29 #define GLOBAL_CTRL_PLL_CLK_CTRL_SHIFT		8
30 #define GLOBAL_CTRL_PLL_CLK_CTRL_MASK		0x0000ff00
31 #define GLOBAL_CTRL_CLK_GATE_SSOFF		BIT(16)
32 #define GLOBAL_CTRL_CLK_POLARITY		BIT(17)
33 #define GLOBAL_CTRL_MOSI_IDLE			BIT(18)
34 
35 #define HSSPI_GLOBAL_EXT_TRIGGER_REG		0x4
36 
37 #define HSSPI_INT_STATUS_REG			0x8
38 #define HSSPI_INT_STATUS_MASKED_REG		0xc
39 #define HSSPI_INT_MASK_REG			0x10
40 
41 #define HSSPI_PINGx_CMD_DONE(i)			BIT((i * 8) + 0)
42 #define HSSPI_PINGx_RX_OVER(i)			BIT((i * 8) + 1)
43 #define HSSPI_PINGx_TX_UNDER(i)			BIT((i * 8) + 2)
44 #define HSSPI_PINGx_POLL_TIMEOUT(i)		BIT((i * 8) + 3)
45 #define HSSPI_PINGx_CTRL_INVAL(i)		BIT((i * 8) + 4)
46 
47 #define HSSPI_INT_CLEAR_ALL			0xff001f1f
48 
49 #define HSSPI_PINGPONG_COMMAND_REG(x)		(0x80 + (x) * 0x40)
50 #define PINGPONG_CMD_COMMAND_MASK		0xf
51 #define PINGPONG_COMMAND_NOOP			0
52 #define PINGPONG_COMMAND_START_NOW		1
53 #define PINGPONG_COMMAND_START_TRIGGER		2
54 #define PINGPONG_COMMAND_HALT			3
55 #define PINGPONG_COMMAND_FLUSH			4
56 #define PINGPONG_CMD_PROFILE_SHIFT		8
57 #define PINGPONG_CMD_SS_SHIFT			12
58 
59 #define HSSPI_PINGPONG_STATUS_REG(x)		(0x84 + (x) * 0x40)
60 #define HSSPI_PINGPONG_STATUS_SRC_BUSY          BIT(1)
61 
62 #define HSSPI_PROFILE_CLK_CTRL_REG(x)		(0x100 + (x) * 0x20)
63 #define CLK_CTRL_FREQ_CTRL_MASK			0x0000ffff
64 #define CLK_CTRL_SPI_CLK_2X_SEL			BIT(14)
65 #define CLK_CTRL_ACCUM_RST_ON_LOOP		BIT(15)
66 #define CLK_CTRL_CLK_POLARITY			BIT(16)
67 
68 #define HSSPI_PROFILE_SIGNAL_CTRL_REG(x)	(0x104 + (x) * 0x20)
69 #define SIGNAL_CTRL_LATCH_RISING		BIT(12)
70 #define SIGNAL_CTRL_LAUNCH_RISING		BIT(13)
71 #define SIGNAL_CTRL_ASYNC_INPUT_PATH		BIT(16)
72 
73 #define HSSPI_PROFILE_MODE_CTRL_REG(x)		(0x108 + (x) * 0x20)
74 #define MODE_CTRL_MULTIDATA_RD_STRT_SHIFT	8
75 #define MODE_CTRL_MULTIDATA_WR_STRT_SHIFT	12
76 #define MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT	16
77 #define MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT	18
78 #define MODE_CTRL_MODE_3WIRE			BIT(20)
79 #define MODE_CTRL_PREPENDBYTE_CNT_SHIFT		24
80 
81 #define HSSPI_FIFO_REG(x)			(0x200 + (x) * 0x200)
82 
83 #define HSSPI_OP_MULTIBIT			BIT(11)
84 #define HSSPI_OP_CODE_SHIFT			13
85 #define HSSPI_OP_SLEEP				(0 << HSSPI_OP_CODE_SHIFT)
86 #define HSSPI_OP_READ_WRITE			(1 << HSSPI_OP_CODE_SHIFT)
87 #define HSSPI_OP_WRITE				(2 << HSSPI_OP_CODE_SHIFT)
88 #define HSSPI_OP_READ				(3 << HSSPI_OP_CODE_SHIFT)
89 #define HSSPI_OP_SETIRQ				(4 << HSSPI_OP_CODE_SHIFT)
90 
91 #define HSSPI_BUFFER_LEN			512
92 #define HSSPI_OPCODE_LEN			2
93 
94 #define HSSPI_MAX_PREPEND_LEN			15
95 
96 #define HSSPI_MAX_SYNC_CLOCK			30000000
97 
98 #define HSSPI_SPI_MAX_CS			8
99 #define HSSPI_BUS_NUM				1	/* 0 is legacy SPI */
100 #define HSSPI_POLL_STATUS_TIMEOUT_MS	100
101 
102 #define HSSPI_WAIT_MODE_POLLING		0
103 #define HSSPI_WAIT_MODE_INTR		1
104 #define HSSPI_WAIT_MODE_MAX			HSSPI_WAIT_MODE_INTR
105 
106 #define SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT		0
107 #define SPIM_CTRL_CS_OVERRIDE_SEL_MASK		0xff
108 #define SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT		8
109 #define SPIM_CTRL_CS_OVERRIDE_VAL_MASK		0xff
110 
111 struct bcmbca_hsspi {
112 	struct completion done;
113 	struct mutex bus_mutex;
114 	struct mutex msg_mutex;
115 	struct platform_device *pdev;
116 	struct clk *clk;
117 	struct clk *pll_clk;
118 	void __iomem *regs;
119 	void __iomem *spim_ctrl;
120 	u8 __iomem *fifo;
121 	u32 speed_hz;
122 	u8 cs_polarity;
123 	u32 wait_mode;
124 };
125 
wait_mode_show(struct device * dev,struct device_attribute * attr,char * buf)126 static ssize_t wait_mode_show(struct device *dev, struct device_attribute *attr,
127 			 char *buf)
128 {
129 	struct spi_controller *ctrl = dev_get_drvdata(dev);
130 	struct bcmbca_hsspi *bs = spi_controller_get_devdata(ctrl);
131 
132 	return sprintf(buf, "%d\n", bs->wait_mode);
133 }
134 
wait_mode_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)135 static ssize_t wait_mode_store(struct device *dev, struct device_attribute *attr,
136 			  const char *buf, size_t count)
137 {
138 	struct spi_controller *ctrl = dev_get_drvdata(dev);
139 	struct bcmbca_hsspi *bs = spi_controller_get_devdata(ctrl);
140 	u32 val;
141 
142 	if (kstrtou32(buf, 10, &val))
143 		return -EINVAL;
144 
145 	if (val > HSSPI_WAIT_MODE_MAX) {
146 		dev_warn(dev, "invalid wait mode %u\n", val);
147 		return -EINVAL;
148 	}
149 
150 	mutex_lock(&bs->msg_mutex);
151 	bs->wait_mode = val;
152 	/* clear interrupt status to avoid spurious int on next transfer */
153 	if (val == HSSPI_WAIT_MODE_INTR)
154 		__raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG);
155 	mutex_unlock(&bs->msg_mutex);
156 
157 	return count;
158 }
159 
160 static DEVICE_ATTR_RW(wait_mode);
161 
162 static struct attribute *bcmbca_hsspi_attrs[] = {
163 	&dev_attr_wait_mode.attr,
164 	NULL,
165 };
166 
167 static const struct attribute_group bcmbca_hsspi_group = {
168 	.attrs = bcmbca_hsspi_attrs,
169 };
170 
bcmbca_hsspi_set_cs(struct bcmbca_hsspi * bs,unsigned int cs,bool active)171 static void bcmbca_hsspi_set_cs(struct bcmbca_hsspi *bs, unsigned int cs,
172 				 bool active)
173 {
174 	u32 reg;
175 
176 	/* No cs orerriden needed for SS7 internal cs on pcm based voice dev */
177 	if (cs == 7)
178 		return;
179 
180 	mutex_lock(&bs->bus_mutex);
181 
182 	reg = __raw_readl(bs->spim_ctrl);
183 	if (active)
184 		reg |= BIT(cs + SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
185 	else
186 		reg &= ~BIT(cs + SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
187 
188 	__raw_writel(reg, bs->spim_ctrl);
189 
190 	mutex_unlock(&bs->bus_mutex);
191 }
192 
bcmbca_hsspi_set_clk(struct bcmbca_hsspi * bs,struct spi_device * spi,int hz)193 static void bcmbca_hsspi_set_clk(struct bcmbca_hsspi *bs,
194 				  struct spi_device *spi, int hz)
195 {
196 	unsigned int profile = spi_get_chipselect(spi, 0);
197 	u32 reg;
198 
199 	reg = DIV_ROUND_UP(2048, DIV_ROUND_UP(bs->speed_hz, hz));
200 	__raw_writel(CLK_CTRL_ACCUM_RST_ON_LOOP | reg,
201 		     bs->regs + HSSPI_PROFILE_CLK_CTRL_REG(profile));
202 
203 	reg = __raw_readl(bs->regs + HSSPI_PROFILE_SIGNAL_CTRL_REG(profile));
204 	if (hz > HSSPI_MAX_SYNC_CLOCK)
205 		reg |= SIGNAL_CTRL_ASYNC_INPUT_PATH;
206 	else
207 		reg &= ~SIGNAL_CTRL_ASYNC_INPUT_PATH;
208 	__raw_writel(reg, bs->regs + HSSPI_PROFILE_SIGNAL_CTRL_REG(profile));
209 
210 	mutex_lock(&bs->bus_mutex);
211 	/* setup clock polarity */
212 	reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG);
213 	reg &= ~GLOBAL_CTRL_CLK_POLARITY;
214 	if (spi->mode & SPI_CPOL)
215 		reg |= GLOBAL_CTRL_CLK_POLARITY;
216 	__raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG);
217 
218 	mutex_unlock(&bs->bus_mutex);
219 }
220 
bcmbca_hsspi_wait_cmd(struct bcmbca_hsspi * bs,unsigned int cs)221 static int bcmbca_hsspi_wait_cmd(struct bcmbca_hsspi *bs, unsigned int cs)
222 {
223 	unsigned long limit;
224 	u32 reg = 0;
225 	int rc = 0;
226 
227 	if (bs->wait_mode == HSSPI_WAIT_MODE_INTR) {
228 		if (wait_for_completion_timeout(&bs->done, HZ) == 0)
229 			rc = 1;
230 	} else {
231 		limit = jiffies + msecs_to_jiffies(HSSPI_POLL_STATUS_TIMEOUT_MS);
232 
233 		while (!time_after(jiffies, limit)) {
234 			reg = __raw_readl(bs->regs + HSSPI_PINGPONG_STATUS_REG(0));
235 			if (reg & HSSPI_PINGPONG_STATUS_SRC_BUSY)
236 				cpu_relax();
237 			else
238 				break;
239 		}
240 		if (reg & HSSPI_PINGPONG_STATUS_SRC_BUSY)
241 			rc = 1;
242 	}
243 
244 	if (rc)
245 		dev_err(&bs->pdev->dev, "transfer timed out!\n");
246 
247 	return rc;
248 }
249 
bcmbca_hsspi_do_txrx(struct spi_device * spi,struct spi_transfer * t,struct spi_message * msg)250 static int bcmbca_hsspi_do_txrx(struct spi_device *spi, struct spi_transfer *t,
251 								struct spi_message *msg)
252 {
253 	struct bcmbca_hsspi *bs = spi_controller_get_devdata(spi->controller);
254 	unsigned int chip_select = spi_get_chipselect(spi, 0);
255 	u16 opcode = 0, val;
256 	int pending = t->len;
257 	int step_size = HSSPI_BUFFER_LEN;
258 	const u8 *tx = t->tx_buf;
259 	u8 *rx = t->rx_buf;
260 	u32 reg = 0, cs_act = 0;
261 
262 	bcmbca_hsspi_set_clk(bs, spi, t->speed_hz);
263 
264 	if (tx && rx)
265 		opcode = HSSPI_OP_READ_WRITE;
266 	else if (tx)
267 		opcode = HSSPI_OP_WRITE;
268 	else if (rx)
269 		opcode = HSSPI_OP_READ;
270 
271 	if (opcode != HSSPI_OP_READ)
272 		step_size -= HSSPI_OPCODE_LEN;
273 
274 	if ((opcode == HSSPI_OP_READ && t->rx_nbits == SPI_NBITS_DUAL) ||
275 	    (opcode == HSSPI_OP_WRITE && t->tx_nbits == SPI_NBITS_DUAL)) {
276 		opcode |= HSSPI_OP_MULTIBIT;
277 
278 		if (t->rx_nbits == SPI_NBITS_DUAL)
279 			reg |= 1 << MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT;
280 		if (t->tx_nbits == SPI_NBITS_DUAL)
281 			reg |= 1 << MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT;
282 	}
283 
284 	__raw_writel(reg | 0xff,
285 		     bs->regs + HSSPI_PROFILE_MODE_CTRL_REG(chip_select));
286 
287 	while (pending > 0) {
288 		int curr_step = min_t(int, step_size, pending);
289 
290 		reinit_completion(&bs->done);
291 		if (tx) {
292 			memcpy_toio(bs->fifo + HSSPI_OPCODE_LEN, tx, curr_step);
293 			tx += curr_step;
294 		}
295 
296 		*(__be16 *)(&val) = cpu_to_be16(opcode | curr_step);
297 		__raw_writew(val, bs->fifo);
298 
299 		/* enable interrupt */
300 		if (bs->wait_mode == HSSPI_WAIT_MODE_INTR)
301 			__raw_writel(HSSPI_PINGx_CMD_DONE(0),
302 			    bs->regs + HSSPI_INT_MASK_REG);
303 
304 		if (!cs_act) {
305 			/* must apply cs signal as close as the cmd starts */
306 			bcmbca_hsspi_set_cs(bs, chip_select, true);
307 			cs_act = 1;
308 		}
309 
310 		reg = chip_select << PINGPONG_CMD_SS_SHIFT |
311 			    chip_select << PINGPONG_CMD_PROFILE_SHIFT |
312 			    PINGPONG_COMMAND_START_NOW;
313 		__raw_writel(reg, bs->regs + HSSPI_PINGPONG_COMMAND_REG(0));
314 
315 		if (bcmbca_hsspi_wait_cmd(bs, spi_get_chipselect(spi, 0)))
316 			return -ETIMEDOUT;
317 
318 		pending -= curr_step;
319 
320 		if (rx) {
321 			memcpy_fromio(rx, bs->fifo, curr_step);
322 			rx += curr_step;
323 		}
324 	}
325 
326 	return 0;
327 }
328 
bcmbca_hsspi_setup(struct spi_device * spi)329 static int bcmbca_hsspi_setup(struct spi_device *spi)
330 {
331 	struct bcmbca_hsspi *bs = spi_controller_get_devdata(spi->controller);
332 	u32 reg;
333 
334 	reg = __raw_readl(bs->regs +
335 			  HSSPI_PROFILE_SIGNAL_CTRL_REG(spi_get_chipselect(spi, 0)));
336 	reg &= ~(SIGNAL_CTRL_LAUNCH_RISING | SIGNAL_CTRL_LATCH_RISING);
337 	if (spi->mode & SPI_CPHA)
338 		reg |= SIGNAL_CTRL_LAUNCH_RISING;
339 	else
340 		reg |= SIGNAL_CTRL_LATCH_RISING;
341 	__raw_writel(reg, bs->regs +
342 		     HSSPI_PROFILE_SIGNAL_CTRL_REG(spi_get_chipselect(spi, 0)));
343 
344 	mutex_lock(&bs->bus_mutex);
345 	reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG);
346 
347 	if (spi->mode & SPI_CS_HIGH)
348 		reg |= BIT(spi_get_chipselect(spi, 0));
349 	else
350 		reg &= ~BIT(spi_get_chipselect(spi, 0));
351 	__raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG);
352 
353 	if (spi->mode & SPI_CS_HIGH)
354 		bs->cs_polarity |= BIT(spi_get_chipselect(spi, 0));
355 	else
356 		bs->cs_polarity &= ~BIT(spi_get_chipselect(spi, 0));
357 
358 	reg = __raw_readl(bs->spim_ctrl);
359 	reg &= ~BIT(spi_get_chipselect(spi, 0) + SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
360 	if (spi->mode & SPI_CS_HIGH)
361 		reg |= BIT(spi_get_chipselect(spi, 0) + SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
362 	__raw_writel(reg, bs->spim_ctrl);
363 
364 	mutex_unlock(&bs->bus_mutex);
365 
366 	return 0;
367 }
368 
bcmbca_hsspi_transfer_one(struct spi_controller * host,struct spi_message * msg)369 static int bcmbca_hsspi_transfer_one(struct spi_controller *host,
370 				      struct spi_message *msg)
371 {
372 	struct bcmbca_hsspi *bs = spi_controller_get_devdata(host);
373 	struct spi_transfer *t;
374 	struct spi_device *spi = msg->spi;
375 	int status = -EINVAL;
376 	bool keep_cs = false;
377 
378 	mutex_lock(&bs->msg_mutex);
379 	list_for_each_entry(t, &msg->transfers, transfer_list) {
380 		status = bcmbca_hsspi_do_txrx(spi, t, msg);
381 		if (status)
382 			break;
383 
384 		spi_transfer_delay_exec(t);
385 
386 		if (t->cs_change) {
387 			if (list_is_last(&t->transfer_list,	&msg->transfers)) {
388 				keep_cs = true;
389 			} else {
390 				if (!t->cs_off)
391 					bcmbca_hsspi_set_cs(bs, spi_get_chipselect(spi, 0), false);
392 
393 				spi_transfer_cs_change_delay_exec(msg, t);
394 
395 				if (!list_next_entry(t, transfer_list)->cs_off)
396 					bcmbca_hsspi_set_cs(bs, spi_get_chipselect(spi, 0), true);
397 			}
398 		} else if (!list_is_last(&t->transfer_list, &msg->transfers) &&
399 			   t->cs_off != list_next_entry(t, transfer_list)->cs_off) {
400 			bcmbca_hsspi_set_cs(bs, spi_get_chipselect(spi, 0), t->cs_off);
401 		}
402 
403 		msg->actual_length += t->len;
404 	}
405 
406 	mutex_unlock(&bs->msg_mutex);
407 
408 	if (status || !keep_cs)
409 		bcmbca_hsspi_set_cs(bs, spi_get_chipselect(spi, 0), false);
410 
411 	msg->status = status;
412 	spi_finalize_current_message(host);
413 
414 	return 0;
415 }
416 
bcmbca_hsspi_interrupt(int irq,void * dev_id)417 static irqreturn_t bcmbca_hsspi_interrupt(int irq, void *dev_id)
418 {
419 	struct bcmbca_hsspi *bs = (struct bcmbca_hsspi *)dev_id;
420 
421 	if (__raw_readl(bs->regs + HSSPI_INT_STATUS_MASKED_REG) == 0)
422 		return IRQ_NONE;
423 
424 	__raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG);
425 	__raw_writel(0, bs->regs + HSSPI_INT_MASK_REG);
426 
427 	complete(&bs->done);
428 
429 	return IRQ_HANDLED;
430 }
431 
bcmbca_hsspi_probe(struct platform_device * pdev)432 static int bcmbca_hsspi_probe(struct platform_device *pdev)
433 {
434 	struct spi_controller *host;
435 	struct bcmbca_hsspi *bs;
436 	struct resource *res_mem;
437 	void __iomem *spim_ctrl;
438 	void __iomem *regs;
439 	struct device *dev = &pdev->dev;
440 	struct clk *clk, *pll_clk = NULL;
441 	int irq, ret;
442 	u32 reg, rate, num_cs = HSSPI_SPI_MAX_CS;
443 
444 	irq = platform_get_irq(pdev, 0);
445 	if (irq < 0)
446 		return irq;
447 
448 	res_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hsspi");
449 	if (!res_mem)
450 		return -EINVAL;
451 	regs = devm_ioremap_resource(dev, res_mem);
452 	if (IS_ERR(regs))
453 		return PTR_ERR(regs);
454 
455 	res_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "spim-ctrl");
456 	if (!res_mem)
457 		return -EINVAL;
458 	spim_ctrl = devm_ioremap_resource(dev, res_mem);
459 	if (IS_ERR(spim_ctrl))
460 		return PTR_ERR(spim_ctrl);
461 
462 	clk = devm_clk_get(dev, "hsspi");
463 	if (IS_ERR(clk))
464 		return PTR_ERR(clk);
465 
466 	ret = clk_prepare_enable(clk);
467 	if (ret)
468 		return ret;
469 
470 	rate = clk_get_rate(clk);
471 	if (!rate) {
472 		pll_clk = devm_clk_get(dev, "pll");
473 
474 		if (IS_ERR(pll_clk)) {
475 			ret = PTR_ERR(pll_clk);
476 			goto out_disable_clk;
477 		}
478 
479 		ret = clk_prepare_enable(pll_clk);
480 		if (ret)
481 			goto out_disable_clk;
482 
483 		rate = clk_get_rate(pll_clk);
484 		if (!rate) {
485 			ret = -EINVAL;
486 			goto out_disable_pll_clk;
487 		}
488 	}
489 
490 	host = spi_alloc_host(&pdev->dev, sizeof(*bs));
491 	if (!host) {
492 		ret = -ENOMEM;
493 		goto out_disable_pll_clk;
494 	}
495 
496 	bs = spi_controller_get_devdata(host);
497 	bs->pdev = pdev;
498 	bs->clk = clk;
499 	bs->pll_clk = pll_clk;
500 	bs->regs = regs;
501 	bs->spim_ctrl = spim_ctrl;
502 	bs->speed_hz = rate;
503 	bs->fifo = (u8 __iomem *) (bs->regs + HSSPI_FIFO_REG(0));
504 	bs->wait_mode = HSSPI_WAIT_MODE_POLLING;
505 
506 	mutex_init(&bs->bus_mutex);
507 	mutex_init(&bs->msg_mutex);
508 	init_completion(&bs->done);
509 
510 	host->dev.of_node = dev->of_node;
511 	if (!dev->of_node)
512 		host->bus_num = HSSPI_BUS_NUM;
513 
514 	of_property_read_u32(dev->of_node, "num-cs", &num_cs);
515 	if (num_cs > 8) {
516 		dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n",
517 			 num_cs);
518 		num_cs = HSSPI_SPI_MAX_CS;
519 	}
520 	host->num_chipselect = num_cs;
521 	host->setup = bcmbca_hsspi_setup;
522 	host->transfer_one_message = bcmbca_hsspi_transfer_one;
523 	host->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH |
524 			  SPI_RX_DUAL | SPI_TX_DUAL;
525 	host->bits_per_word_mask = SPI_BPW_MASK(8);
526 	host->auto_runtime_pm = true;
527 
528 	platform_set_drvdata(pdev, host);
529 
530 	/* Initialize the hardware */
531 	__raw_writel(0, bs->regs + HSSPI_INT_MASK_REG);
532 
533 	/* clean up any pending interrupts */
534 	__raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG);
535 
536 	/* read out default CS polarities */
537 	reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG);
538 	bs->cs_polarity = reg & GLOBAL_CTRL_CS_POLARITY_MASK;
539 	__raw_writel(reg | GLOBAL_CTRL_CLK_GATE_SSOFF,
540 		     bs->regs + HSSPI_GLOBAL_CTRL_REG);
541 
542 	if (irq > 0) {
543 		ret = devm_request_irq(dev, irq, bcmbca_hsspi_interrupt, IRQF_SHARED,
544 			       pdev->name, bs);
545 		if (ret)
546 			goto out_put_host;
547 	}
548 
549 	pm_runtime_enable(&pdev->dev);
550 
551 	ret = sysfs_create_group(&pdev->dev.kobj, &bcmbca_hsspi_group);
552 	if (ret) {
553 		dev_err(&pdev->dev, "couldn't register sysfs group\n");
554 		goto out_pm_disable;
555 	}
556 
557 	/* register and we are done */
558 	ret = devm_spi_register_controller(dev, host);
559 	if (ret)
560 		goto out_sysgroup_disable;
561 
562 	dev_info(dev, "Broadcom BCMBCA High Speed SPI Controller driver");
563 
564 	return 0;
565 
566 out_sysgroup_disable:
567 	sysfs_remove_group(&pdev->dev.kobj, &bcmbca_hsspi_group);
568 out_pm_disable:
569 	pm_runtime_disable(&pdev->dev);
570 out_put_host:
571 	spi_controller_put(host);
572 out_disable_pll_clk:
573 	clk_disable_unprepare(pll_clk);
574 out_disable_clk:
575 	clk_disable_unprepare(clk);
576 	return ret;
577 }
578 
bcmbca_hsspi_remove(struct platform_device * pdev)579 static void bcmbca_hsspi_remove(struct platform_device *pdev)
580 {
581 	struct spi_controller *host = platform_get_drvdata(pdev);
582 	struct bcmbca_hsspi *bs = spi_controller_get_devdata(host);
583 
584 	/* reset the hardware and block queue progress */
585 	__raw_writel(0, bs->regs + HSSPI_INT_MASK_REG);
586 	clk_disable_unprepare(bs->pll_clk);
587 	clk_disable_unprepare(bs->clk);
588 	sysfs_remove_group(&pdev->dev.kobj, &bcmbca_hsspi_group);
589 }
590 
591 #ifdef CONFIG_PM_SLEEP
bcmbca_hsspi_suspend(struct device * dev)592 static int bcmbca_hsspi_suspend(struct device *dev)
593 {
594 	struct spi_controller *host = dev_get_drvdata(dev);
595 	struct bcmbca_hsspi *bs = spi_controller_get_devdata(host);
596 
597 	spi_controller_suspend(host);
598 	clk_disable_unprepare(bs->pll_clk);
599 	clk_disable_unprepare(bs->clk);
600 
601 	return 0;
602 }
603 
bcmbca_hsspi_resume(struct device * dev)604 static int bcmbca_hsspi_resume(struct device *dev)
605 {
606 	struct spi_controller *host = dev_get_drvdata(dev);
607 	struct bcmbca_hsspi *bs = spi_controller_get_devdata(host);
608 	int ret;
609 
610 	ret = clk_prepare_enable(bs->clk);
611 	if (ret)
612 		return ret;
613 
614 	if (bs->pll_clk) {
615 		ret = clk_prepare_enable(bs->pll_clk);
616 		if (ret) {
617 			clk_disable_unprepare(bs->clk);
618 			return ret;
619 		}
620 	}
621 
622 	spi_controller_resume(host);
623 
624 	return 0;
625 }
626 #endif
627 
628 static SIMPLE_DEV_PM_OPS(bcmbca_hsspi_pm_ops, bcmbca_hsspi_suspend,
629 			 bcmbca_hsspi_resume);
630 
631 static const struct of_device_id bcmbca_hsspi_of_match[] = {
632 	{ .compatible = "brcm,bcmbca-hsspi-v1.1", },
633 	{},
634 };
635 
636 MODULE_DEVICE_TABLE(of, bcmbca_hsspi_of_match);
637 
638 static struct platform_driver bcmbca_hsspi_driver = {
639 	.driver = {
640 		   .name = "bcmbca-hsspi",
641 		   .pm = &bcmbca_hsspi_pm_ops,
642 		   .of_match_table = bcmbca_hsspi_of_match,
643 		   },
644 	.probe = bcmbca_hsspi_probe,
645 	.remove_new = bcmbca_hsspi_remove,
646 };
647 
648 module_platform_driver(bcmbca_hsspi_driver);
649 
650 MODULE_ALIAS("platform:bcmbca_hsspi");
651 MODULE_DESCRIPTION("Broadcom BCMBCA High Speed SPI Controller driver");
652 MODULE_LICENSE("GPL");
653