1 // SPDX-License-Identifier: GPL-2.0-only
2 // Copyright (c) 2021 Sunplus Inc.
3 // Author: Li-hao Kuo <lhjeff911@gmail.com>
4
5 #include <linux/bitfield.h>
6 #include <linux/clk.h>
7 #include <linux/delay.h>
8 #include <linux/dma-mapping.h>
9 #include <linux/interrupt.h>
10 #include <linux/module.h>
11 #include <linux/of.h>
12 #include <linux/platform_device.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/reset.h>
15 #include <linux/spi/spi.h>
16
17 #define SP7021_DATA_RDY_REG 0x0044
18 #define SP7021_SLAVE_DMA_CTRL_REG 0x0048
19 #define SP7021_SLAVE_DMA_LENGTH_REG 0x004c
20 #define SP7021_SLAVE_DMA_ADDR_REG 0x004c
21
22 #define SP7021_SLAVE_DATA_RDY BIT(0)
23 #define SP7021_SLAVE_SW_RST BIT(1)
24 #define SP7021_SLA_DMA_W_INT BIT(8)
25 #define SP7021_SLAVE_CLR_INT BIT(8)
26 #define SP7021_SLAVE_DMA_EN BIT(0)
27 #define SP7021_SLAVE_DMA_RW BIT(6)
28 #define SP7021_SLAVE_DMA_CMD GENMASK(3, 2)
29
30 #define SP7021_FIFO_REG 0x0034
31 #define SP7021_SPI_STATUS_REG 0x0038
32 #define SP7021_SPI_CONFIG_REG 0x003c
33 #define SP7021_INT_BUSY_REG 0x004c
34 #define SP7021_DMA_CTRL_REG 0x0050
35
36 #define SP7021_SPI_START_FD BIT(0)
37 #define SP7021_FD_SW_RST BIT(1)
38 #define SP7021_TX_EMP_FLAG BIT(2)
39 #define SP7021_RX_EMP_FLAG BIT(4)
40 #define SP7021_RX_FULL_FLAG BIT(5)
41 #define SP7021_FINISH_FLAG BIT(6)
42
43 #define SP7021_TX_CNT_MASK GENMASK(11, 8)
44 #define SP7021_RX_CNT_MASK GENMASK(15, 12)
45 #define SP7021_TX_LEN_MASK GENMASK(23, 16)
46 #define SP7021_GET_LEN_MASK GENMASK(31, 24)
47 #define SP7021_SET_TX_LEN GENMASK(23, 16)
48 #define SP7021_SET_XFER_LEN GENMASK(31, 24)
49
50 #define SP7021_CPOL_FD BIT(0)
51 #define SP7021_CPHA_R BIT(1)
52 #define SP7021_CPHA_W BIT(2)
53 #define SP7021_LSB_SEL BIT(4)
54 #define SP7021_CS_POR BIT(5)
55 #define SP7021_FD_SEL BIT(6)
56
57 #define SP7021_RX_UNIT GENMASK(8, 7)
58 #define SP7021_TX_UNIT GENMASK(10, 9)
59 #define SP7021_TX_EMP_FLAG_MASK BIT(11)
60 #define SP7021_RX_FULL_FLAG_MASK BIT(14)
61 #define SP7021_FINISH_FLAG_MASK BIT(15)
62 #define SP7021_CLEAN_RW_BYTE GENMASK(10, 7)
63 #define SP7021_CLEAN_FLUG_MASK GENMASK(15, 11)
64 #define SP7021_CLK_MASK GENMASK(31, 16)
65
66 #define SP7021_INT_BYPASS BIT(3)
67 #define SP7021_CLR_MASTER_INT BIT(6)
68
69 #define SP7021_SPI_DATA_SIZE (255)
70 #define SP7021_FIFO_DATA_LEN (16)
71
72 enum {
73 SP7021_HOST_MODE = 0,
74 SP7021_TARGET_MODE = 1,
75 };
76
77 struct sp7021_spi_ctlr {
78 struct device *dev;
79 struct spi_controller *ctlr;
80 void __iomem *m_base;
81 void __iomem *s_base;
82 u32 xfer_conf;
83 int mode;
84 int m_irq;
85 int s_irq;
86 struct clk *spi_clk;
87 struct reset_control *rstc;
88 // data xfer lock
89 struct mutex buf_lock;
90 struct completion isr_done;
91 struct completion target_isr;
92 unsigned int rx_cur_len;
93 unsigned int tx_cur_len;
94 unsigned int data_unit;
95 const u8 *tx_buf;
96 u8 *rx_buf;
97 };
98
sp7021_spi_target_irq(int irq,void * dev)99 static irqreturn_t sp7021_spi_target_irq(int irq, void *dev)
100 {
101 struct sp7021_spi_ctlr *pspim = dev;
102 unsigned int data_status;
103
104 data_status = readl(pspim->s_base + SP7021_DATA_RDY_REG);
105 data_status |= SP7021_SLAVE_CLR_INT;
106 writel(data_status , pspim->s_base + SP7021_DATA_RDY_REG);
107 complete(&pspim->target_isr);
108 return IRQ_HANDLED;
109 }
110
sp7021_spi_target_abort(struct spi_controller * ctlr)111 static int sp7021_spi_target_abort(struct spi_controller *ctlr)
112 {
113 struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(ctlr);
114
115 complete(&pspim->target_isr);
116 complete(&pspim->isr_done);
117 return 0;
118 }
119
sp7021_spi_target_tx(struct spi_device * spi,struct spi_transfer * xfer)120 static int sp7021_spi_target_tx(struct spi_device *spi, struct spi_transfer *xfer)
121 {
122 struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(spi->controller);
123 u32 value;
124
125 reinit_completion(&pspim->target_isr);
126 value = SP7021_SLAVE_DMA_EN | SP7021_SLAVE_DMA_RW | FIELD_PREP(SP7021_SLAVE_DMA_CMD, 3);
127 writel(value, pspim->s_base + SP7021_SLAVE_DMA_CTRL_REG);
128 writel(xfer->len, pspim->s_base + SP7021_SLAVE_DMA_LENGTH_REG);
129 writel(xfer->tx_dma, pspim->s_base + SP7021_SLAVE_DMA_ADDR_REG);
130 value = readl(pspim->s_base + SP7021_DATA_RDY_REG);
131 value |= SP7021_SLAVE_DATA_RDY;
132 writel(value, pspim->s_base + SP7021_DATA_RDY_REG);
133 if (wait_for_completion_interruptible(&pspim->isr_done)) {
134 dev_err(&spi->dev, "%s() wait_for_completion err\n", __func__);
135 return -EINTR;
136 }
137 return 0;
138 }
139
sp7021_spi_target_rx(struct spi_device * spi,struct spi_transfer * xfer)140 static int sp7021_spi_target_rx(struct spi_device *spi, struct spi_transfer *xfer)
141 {
142 struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(spi->controller);
143 u32 value;
144
145 reinit_completion(&pspim->isr_done);
146 value = SP7021_SLAVE_DMA_EN | FIELD_PREP(SP7021_SLAVE_DMA_CMD, 3);
147 writel(value, pspim->s_base + SP7021_SLAVE_DMA_CTRL_REG);
148 writel(xfer->len, pspim->s_base + SP7021_SLAVE_DMA_LENGTH_REG);
149 writel(xfer->rx_dma, pspim->s_base + SP7021_SLAVE_DMA_ADDR_REG);
150 if (wait_for_completion_interruptible(&pspim->isr_done)) {
151 dev_err(&spi->dev, "%s() wait_for_completion err\n", __func__);
152 return -EINTR;
153 }
154 writel(SP7021_SLAVE_SW_RST, pspim->s_base + SP7021_SLAVE_DMA_CTRL_REG);
155 return 0;
156 }
157
sp7021_spi_host_rb(struct sp7021_spi_ctlr * pspim,unsigned int len)158 static void sp7021_spi_host_rb(struct sp7021_spi_ctlr *pspim, unsigned int len)
159 {
160 int i;
161
162 for (i = 0; i < len; i++) {
163 pspim->rx_buf[pspim->rx_cur_len] =
164 readl(pspim->m_base + SP7021_FIFO_REG);
165 pspim->rx_cur_len++;
166 }
167 }
168
sp7021_spi_host_wb(struct sp7021_spi_ctlr * pspim,unsigned int len)169 static void sp7021_spi_host_wb(struct sp7021_spi_ctlr *pspim, unsigned int len)
170 {
171 int i;
172
173 for (i = 0; i < len; i++) {
174 writel(pspim->tx_buf[pspim->tx_cur_len],
175 pspim->m_base + SP7021_FIFO_REG);
176 pspim->tx_cur_len++;
177 }
178 }
179
sp7021_spi_host_irq(int irq,void * dev)180 static irqreturn_t sp7021_spi_host_irq(int irq, void *dev)
181 {
182 struct sp7021_spi_ctlr *pspim = dev;
183 unsigned int tx_cnt, total_len;
184 unsigned int tx_len, rx_cnt;
185 unsigned int fd_status;
186 bool isrdone = false;
187 u32 value;
188
189 fd_status = readl(pspim->m_base + SP7021_SPI_STATUS_REG);
190 tx_cnt = FIELD_GET(SP7021_TX_CNT_MASK, fd_status);
191 tx_len = FIELD_GET(SP7021_TX_LEN_MASK, fd_status);
192 total_len = FIELD_GET(SP7021_GET_LEN_MASK, fd_status);
193
194 if ((fd_status & SP7021_TX_EMP_FLAG) && (fd_status & SP7021_RX_EMP_FLAG) && total_len == 0)
195 return IRQ_NONE;
196
197 if (tx_len == 0 && total_len == 0)
198 return IRQ_NONE;
199
200 rx_cnt = FIELD_GET(SP7021_RX_CNT_MASK, fd_status);
201 if (fd_status & SP7021_RX_FULL_FLAG)
202 rx_cnt = pspim->data_unit;
203
204 tx_cnt = min(tx_len - pspim->tx_cur_len, pspim->data_unit - tx_cnt);
205 dev_dbg(pspim->dev, "fd_st=0x%x rx_c:%d tx_c:%d tx_l:%d",
206 fd_status, rx_cnt, tx_cnt, tx_len);
207
208 if (rx_cnt > 0)
209 sp7021_spi_host_rb(pspim, rx_cnt);
210 if (tx_cnt > 0)
211 sp7021_spi_host_wb(pspim, tx_cnt);
212
213 fd_status = readl(pspim->m_base + SP7021_SPI_STATUS_REG);
214 tx_len = FIELD_GET(SP7021_TX_LEN_MASK, fd_status);
215 total_len = FIELD_GET(SP7021_GET_LEN_MASK, fd_status);
216
217 if (fd_status & SP7021_FINISH_FLAG || tx_len == pspim->tx_cur_len) {
218 while (total_len != pspim->rx_cur_len) {
219 fd_status = readl(pspim->m_base + SP7021_SPI_STATUS_REG);
220 total_len = FIELD_GET(SP7021_GET_LEN_MASK, fd_status);
221 if (fd_status & SP7021_RX_FULL_FLAG)
222 rx_cnt = pspim->data_unit;
223 else
224 rx_cnt = FIELD_GET(SP7021_RX_CNT_MASK, fd_status);
225
226 if (rx_cnt > 0)
227 sp7021_spi_host_rb(pspim, rx_cnt);
228 }
229 value = readl(pspim->m_base + SP7021_INT_BUSY_REG);
230 value |= SP7021_CLR_MASTER_INT;
231 writel(value, pspim->m_base + SP7021_INT_BUSY_REG);
232 writel(SP7021_FINISH_FLAG, pspim->m_base + SP7021_SPI_STATUS_REG);
233 isrdone = true;
234 }
235
236 if (isrdone)
237 complete(&pspim->isr_done);
238 return IRQ_HANDLED;
239 }
240
sp7021_prep_transfer(struct spi_controller * ctlr,struct spi_device * spi)241 static void sp7021_prep_transfer(struct spi_controller *ctlr, struct spi_device *spi)
242 {
243 struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(ctlr);
244
245 pspim->tx_cur_len = 0;
246 pspim->rx_cur_len = 0;
247 pspim->data_unit = SP7021_FIFO_DATA_LEN;
248 }
249
250 // preliminary set CS, CPOL, CPHA and LSB
sp7021_spi_controller_prepare_message(struct spi_controller * ctlr,struct spi_message * msg)251 static int sp7021_spi_controller_prepare_message(struct spi_controller *ctlr,
252 struct spi_message *msg)
253 {
254 struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(ctlr);
255 struct spi_device *s = msg->spi;
256 u32 valus, rs = 0;
257
258 valus = readl(pspim->m_base + SP7021_SPI_STATUS_REG);
259 valus |= SP7021_FD_SW_RST;
260 writel(valus, pspim->m_base + SP7021_SPI_STATUS_REG);
261 rs |= SP7021_FD_SEL;
262 if (s->mode & SPI_CPOL)
263 rs |= SP7021_CPOL_FD;
264
265 if (s->mode & SPI_LSB_FIRST)
266 rs |= SP7021_LSB_SEL;
267
268 if (s->mode & SPI_CS_HIGH)
269 rs |= SP7021_CS_POR;
270
271 if (s->mode & SPI_CPHA)
272 rs |= SP7021_CPHA_R;
273 else
274 rs |= SP7021_CPHA_W;
275
276 rs |= FIELD_PREP(SP7021_TX_UNIT, 0) | FIELD_PREP(SP7021_RX_UNIT, 0);
277 pspim->xfer_conf = rs;
278 if (pspim->xfer_conf & SP7021_CPOL_FD)
279 writel(pspim->xfer_conf, pspim->m_base + SP7021_SPI_CONFIG_REG);
280
281 return 0;
282 }
283
sp7021_spi_setup_clk(struct spi_controller * ctlr,struct spi_transfer * xfer)284 static void sp7021_spi_setup_clk(struct spi_controller *ctlr, struct spi_transfer *xfer)
285 {
286 struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(ctlr);
287 u32 clk_rate, clk_sel, div;
288
289 clk_rate = clk_get_rate(pspim->spi_clk);
290 div = max(2U, clk_rate / xfer->speed_hz);
291
292 clk_sel = (div / 2) - 1;
293 pspim->xfer_conf &= ~SP7021_CLK_MASK;
294 pspim->xfer_conf |= FIELD_PREP(SP7021_CLK_MASK, clk_sel);
295 writel(pspim->xfer_conf, pspim->m_base + SP7021_SPI_CONFIG_REG);
296 }
297
sp7021_spi_host_transfer_one(struct spi_controller * ctlr,struct spi_device * spi,struct spi_transfer * xfer)298 static int sp7021_spi_host_transfer_one(struct spi_controller *ctlr, struct spi_device *spi,
299 struct spi_transfer *xfer)
300 {
301 struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(ctlr);
302 unsigned long timeout = msecs_to_jiffies(1000);
303 unsigned int xfer_cnt, xfer_len, last_len;
304 unsigned int i, len_temp;
305 u32 reg_temp;
306
307 xfer_cnt = xfer->len / SP7021_SPI_DATA_SIZE;
308 last_len = xfer->len % SP7021_SPI_DATA_SIZE;
309
310 for (i = 0; i <= xfer_cnt; i++) {
311 mutex_lock(&pspim->buf_lock);
312 sp7021_prep_transfer(ctlr, spi);
313 sp7021_spi_setup_clk(ctlr, xfer);
314 reinit_completion(&pspim->isr_done);
315
316 if (i == xfer_cnt)
317 xfer_len = last_len;
318 else
319 xfer_len = SP7021_SPI_DATA_SIZE;
320
321 pspim->tx_buf = xfer->tx_buf + i * SP7021_SPI_DATA_SIZE;
322 pspim->rx_buf = xfer->rx_buf + i * SP7021_SPI_DATA_SIZE;
323
324 if (pspim->tx_cur_len < xfer_len) {
325 len_temp = min(pspim->data_unit, xfer_len);
326 sp7021_spi_host_wb(pspim, len_temp);
327 }
328 reg_temp = readl(pspim->m_base + SP7021_SPI_CONFIG_REG);
329 reg_temp &= ~SP7021_CLEAN_RW_BYTE;
330 reg_temp &= ~SP7021_CLEAN_FLUG_MASK;
331 reg_temp |= SP7021_FD_SEL | SP7021_FINISH_FLAG_MASK |
332 SP7021_TX_EMP_FLAG_MASK | SP7021_RX_FULL_FLAG_MASK |
333 FIELD_PREP(SP7021_TX_UNIT, 0) | FIELD_PREP(SP7021_RX_UNIT, 0);
334 writel(reg_temp, pspim->m_base + SP7021_SPI_CONFIG_REG);
335
336 reg_temp = FIELD_PREP(SP7021_SET_TX_LEN, xfer_len) |
337 FIELD_PREP(SP7021_SET_XFER_LEN, xfer_len) |
338 SP7021_SPI_START_FD;
339 writel(reg_temp, pspim->m_base + SP7021_SPI_STATUS_REG);
340
341 if (!wait_for_completion_interruptible_timeout(&pspim->isr_done, timeout)) {
342 dev_err(&spi->dev, "wait_for_completion err\n");
343 mutex_unlock(&pspim->buf_lock);
344 return -ETIMEDOUT;
345 }
346
347 reg_temp = readl(pspim->m_base + SP7021_SPI_STATUS_REG);
348 if (reg_temp & SP7021_FINISH_FLAG) {
349 writel(SP7021_FINISH_FLAG, pspim->m_base + SP7021_SPI_STATUS_REG);
350 writel(readl(pspim->m_base + SP7021_SPI_CONFIG_REG) &
351 SP7021_CLEAN_FLUG_MASK, pspim->m_base + SP7021_SPI_CONFIG_REG);
352 }
353
354 if (pspim->xfer_conf & SP7021_CPOL_FD)
355 writel(pspim->xfer_conf, pspim->m_base + SP7021_SPI_CONFIG_REG);
356
357 mutex_unlock(&pspim->buf_lock);
358 }
359 return 0;
360 }
361
sp7021_spi_target_transfer_one(struct spi_controller * ctlr,struct spi_device * spi,struct spi_transfer * xfer)362 static int sp7021_spi_target_transfer_one(struct spi_controller *ctlr, struct spi_device *spi,
363 struct spi_transfer *xfer)
364 {
365 struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(ctlr);
366 struct device *dev = pspim->dev;
367 int ret;
368
369 if (xfer->tx_buf && !xfer->rx_buf) {
370 xfer->tx_dma = dma_map_single(dev, (void *)xfer->tx_buf,
371 xfer->len, DMA_TO_DEVICE);
372 if (dma_mapping_error(dev, xfer->tx_dma))
373 return -ENOMEM;
374 ret = sp7021_spi_target_tx(spi, xfer);
375 dma_unmap_single(dev, xfer->tx_dma, xfer->len, DMA_TO_DEVICE);
376 } else if (xfer->rx_buf && !xfer->tx_buf) {
377 xfer->rx_dma = dma_map_single(dev, xfer->rx_buf, xfer->len,
378 DMA_FROM_DEVICE);
379 if (dma_mapping_error(dev, xfer->rx_dma))
380 return -ENOMEM;
381 ret = sp7021_spi_target_rx(spi, xfer);
382 dma_unmap_single(dev, xfer->rx_dma, xfer->len, DMA_FROM_DEVICE);
383 } else {
384 dev_dbg(&ctlr->dev, "%s() wrong command\n", __func__);
385 return -EINVAL;
386 }
387
388 spi_finalize_current_transfer(ctlr);
389 return ret;
390 }
391
sp7021_spi_disable_unprepare(void * data)392 static void sp7021_spi_disable_unprepare(void *data)
393 {
394 clk_disable_unprepare(data);
395 }
396
sp7021_spi_reset_control_assert(void * data)397 static void sp7021_spi_reset_control_assert(void *data)
398 {
399 reset_control_assert(data);
400 }
401
sp7021_spi_controller_probe(struct platform_device * pdev)402 static int sp7021_spi_controller_probe(struct platform_device *pdev)
403 {
404 struct device *dev = &pdev->dev;
405 struct sp7021_spi_ctlr *pspim;
406 struct spi_controller *ctlr;
407 int mode, ret;
408
409 pdev->id = of_alias_get_id(pdev->dev.of_node, "sp_spi");
410
411 if (device_property_read_bool(dev, "spi-slave"))
412 mode = SP7021_TARGET_MODE;
413 else
414 mode = SP7021_HOST_MODE;
415
416 if (mode == SP7021_TARGET_MODE)
417 ctlr = devm_spi_alloc_target(dev, sizeof(*pspim));
418 else
419 ctlr = devm_spi_alloc_host(dev, sizeof(*pspim));
420 if (!ctlr)
421 return -ENOMEM;
422 device_set_node(&ctlr->dev, dev_fwnode(dev));
423 ctlr->bus_num = pdev->id;
424 ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
425 ctlr->auto_runtime_pm = true;
426 ctlr->prepare_message = sp7021_spi_controller_prepare_message;
427 if (mode == SP7021_TARGET_MODE) {
428 ctlr->transfer_one = sp7021_spi_target_transfer_one;
429 ctlr->target_abort = sp7021_spi_target_abort;
430 ctlr->flags = SPI_CONTROLLER_HALF_DUPLEX;
431 } else {
432 ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
433 ctlr->min_speed_hz = 40000;
434 ctlr->max_speed_hz = 25000000;
435 ctlr->use_gpio_descriptors = true;
436 ctlr->flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX;
437 ctlr->transfer_one = sp7021_spi_host_transfer_one;
438 }
439 platform_set_drvdata(pdev, ctlr);
440 pspim = spi_controller_get_devdata(ctlr);
441 pspim->mode = mode;
442 pspim->ctlr = ctlr;
443 pspim->dev = dev;
444 mutex_init(&pspim->buf_lock);
445 init_completion(&pspim->isr_done);
446 init_completion(&pspim->target_isr);
447
448 pspim->m_base = devm_platform_ioremap_resource_byname(pdev, "master");
449 if (IS_ERR(pspim->m_base))
450 return dev_err_probe(dev, PTR_ERR(pspim->m_base), "m_base get fail\n");
451
452 pspim->s_base = devm_platform_ioremap_resource_byname(pdev, "slave");
453 if (IS_ERR(pspim->s_base))
454 return dev_err_probe(dev, PTR_ERR(pspim->s_base), "s_base get fail\n");
455
456 pspim->m_irq = platform_get_irq_byname(pdev, "master_risc");
457 if (pspim->m_irq < 0)
458 return pspim->m_irq;
459
460 pspim->s_irq = platform_get_irq_byname(pdev, "slave_risc");
461 if (pspim->s_irq < 0)
462 return pspim->s_irq;
463
464 pspim->spi_clk = devm_clk_get(dev, NULL);
465 if (IS_ERR(pspim->spi_clk))
466 return dev_err_probe(dev, PTR_ERR(pspim->spi_clk), "clk get fail\n");
467
468 pspim->rstc = devm_reset_control_get_exclusive(dev, NULL);
469 if (IS_ERR(pspim->rstc))
470 return dev_err_probe(dev, PTR_ERR(pspim->rstc), "rst get fail\n");
471
472 ret = clk_prepare_enable(pspim->spi_clk);
473 if (ret)
474 return dev_err_probe(dev, ret, "failed to enable clk\n");
475
476 ret = devm_add_action_or_reset(dev, sp7021_spi_disable_unprepare, pspim->spi_clk);
477 if (ret)
478 return ret;
479
480 ret = reset_control_deassert(pspim->rstc);
481 if (ret)
482 return dev_err_probe(dev, ret, "failed to deassert reset\n");
483
484 ret = devm_add_action_or_reset(dev, sp7021_spi_reset_control_assert, pspim->rstc);
485 if (ret)
486 return ret;
487
488 ret = devm_request_irq(dev, pspim->m_irq, sp7021_spi_host_irq,
489 IRQF_TRIGGER_RISING, pdev->name, pspim);
490 if (ret)
491 return ret;
492
493 ret = devm_request_irq(dev, pspim->s_irq, sp7021_spi_target_irq,
494 IRQF_TRIGGER_RISING, pdev->name, pspim);
495 if (ret)
496 return ret;
497
498 pm_runtime_enable(dev);
499 ret = spi_register_controller(ctlr);
500 if (ret) {
501 pm_runtime_disable(dev);
502 return dev_err_probe(dev, ret, "spi_register_controller fail\n");
503 }
504 return 0;
505 }
506
sp7021_spi_controller_remove(struct platform_device * pdev)507 static void sp7021_spi_controller_remove(struct platform_device *pdev)
508 {
509 struct spi_controller *ctlr = dev_get_drvdata(&pdev->dev);
510
511 spi_unregister_controller(ctlr);
512 pm_runtime_disable(&pdev->dev);
513 pm_runtime_set_suspended(&pdev->dev);
514 }
515
sp7021_spi_controller_suspend(struct device * dev)516 static int __maybe_unused sp7021_spi_controller_suspend(struct device *dev)
517 {
518 struct spi_controller *ctlr = dev_get_drvdata(dev);
519 struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(ctlr);
520
521 return reset_control_assert(pspim->rstc);
522 }
523
sp7021_spi_controller_resume(struct device * dev)524 static int __maybe_unused sp7021_spi_controller_resume(struct device *dev)
525 {
526 struct spi_controller *ctlr = dev_get_drvdata(dev);
527 struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(ctlr);
528
529 reset_control_deassert(pspim->rstc);
530 return clk_prepare_enable(pspim->spi_clk);
531 }
532
533 #ifdef CONFIG_PM
sp7021_spi_runtime_suspend(struct device * dev)534 static int sp7021_spi_runtime_suspend(struct device *dev)
535 {
536 struct spi_controller *ctlr = dev_get_drvdata(dev);
537 struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(ctlr);
538
539 return reset_control_assert(pspim->rstc);
540 }
541
sp7021_spi_runtime_resume(struct device * dev)542 static int sp7021_spi_runtime_resume(struct device *dev)
543 {
544 struct spi_controller *ctlr = dev_get_drvdata(dev);
545 struct sp7021_spi_ctlr *pspim = spi_controller_get_devdata(ctlr);
546
547 return reset_control_deassert(pspim->rstc);
548 }
549 #endif
550
551 static const struct dev_pm_ops sp7021_spi_pm_ops = {
552 SET_RUNTIME_PM_OPS(sp7021_spi_runtime_suspend,
553 sp7021_spi_runtime_resume, NULL)
554 SET_SYSTEM_SLEEP_PM_OPS(sp7021_spi_controller_suspend,
555 sp7021_spi_controller_resume)
556 };
557
558 static const struct of_device_id sp7021_spi_controller_ids[] = {
559 { .compatible = "sunplus,sp7021-spi" },
560 {}
561 };
562 MODULE_DEVICE_TABLE(of, sp7021_spi_controller_ids);
563
564 static struct platform_driver sp7021_spi_controller_driver = {
565 .probe = sp7021_spi_controller_probe,
566 .remove_new = sp7021_spi_controller_remove,
567 .driver = {
568 .name = "sunplus,sp7021-spi-controller",
569 .of_match_table = sp7021_spi_controller_ids,
570 .pm = &sp7021_spi_pm_ops,
571 },
572 };
573 module_platform_driver(sp7021_spi_controller_driver);
574
575 MODULE_AUTHOR("Li-hao Kuo <lhjeff911@gmail.com>");
576 MODULE_DESCRIPTION("Sunplus SPI controller driver");
577 MODULE_LICENSE("GPL");
578