1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Driver for Amlogic A1 SPI flash controller (SPIFC)
4 *
5 * Copyright (c) 2023, SberDevices. All Rights Reserved.
6 *
7 * Author: Martin Kurbanov <mmkurbanov@sberdevices.ru>
8 */
9
10 #include <linux/bitfield.h>
11 #include <linux/clk.h>
12 #include <linux/device.h>
13 #include <linux/io.h>
14 #include <linux/iopoll.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/platform_device.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/spi/spi.h>
21 #include <linux/spi/spi-mem.h>
22 #include <linux/types.h>
23
24 #define SPIFC_A1_AHB_CTRL_REG 0x0
25 #define SPIFC_A1_AHB_BUS_EN BIT(31)
26
27 #define SPIFC_A1_USER_CTRL0_REG 0x200
28 #define SPIFC_A1_USER_REQUEST_ENABLE BIT(31)
29 #define SPIFC_A1_USER_REQUEST_FINISH BIT(30)
30 #define SPIFC_A1_USER_DATA_UPDATED BIT(0)
31
32 #define SPIFC_A1_USER_CTRL1_REG 0x204
33 #define SPIFC_A1_USER_CMD_ENABLE BIT(30)
34 #define SPIFC_A1_USER_CMD_MODE GENMASK(29, 28)
35 #define SPIFC_A1_USER_CMD_CODE GENMASK(27, 20)
36 #define SPIFC_A1_USER_ADDR_ENABLE BIT(19)
37 #define SPIFC_A1_USER_ADDR_MODE GENMASK(18, 17)
38 #define SPIFC_A1_USER_ADDR_BYTES GENMASK(16, 15)
39 #define SPIFC_A1_USER_DOUT_ENABLE BIT(14)
40 #define SPIFC_A1_USER_DOUT_MODE GENMASK(11, 10)
41 #define SPIFC_A1_USER_DOUT_BYTES GENMASK(9, 0)
42
43 #define SPIFC_A1_USER_CTRL2_REG 0x208
44 #define SPIFC_A1_USER_DUMMY_ENABLE BIT(31)
45 #define SPIFC_A1_USER_DUMMY_MODE GENMASK(30, 29)
46 #define SPIFC_A1_USER_DUMMY_CLK_SYCLES GENMASK(28, 23)
47
48 #define SPIFC_A1_USER_CTRL3_REG 0x20c
49 #define SPIFC_A1_USER_DIN_ENABLE BIT(31)
50 #define SPIFC_A1_USER_DIN_MODE GENMASK(28, 27)
51 #define SPIFC_A1_USER_DIN_BYTES GENMASK(25, 16)
52
53 #define SPIFC_A1_USER_ADDR_REG 0x210
54
55 #define SPIFC_A1_AHB_REQ_CTRL_REG 0x214
56 #define SPIFC_A1_AHB_REQ_ENABLE BIT(31)
57
58 #define SPIFC_A1_ACTIMING0_REG (0x0088 << 2)
59 #define SPIFC_A1_TSLCH GENMASK(31, 30)
60 #define SPIFC_A1_TCLSH GENMASK(29, 28)
61 #define SPIFC_A1_TSHWL GENMASK(20, 16)
62 #define SPIFC_A1_TSHSL2 GENMASK(15, 12)
63 #define SPIFC_A1_TSHSL1 GENMASK(11, 8)
64 #define SPIFC_A1_TWHSL GENMASK(7, 0)
65
66 #define SPIFC_A1_DBUF_CTRL_REG 0x240
67 #define SPIFC_A1_DBUF_DIR BIT(31)
68 #define SPIFC_A1_DBUF_AUTO_UPDATE_ADDR BIT(30)
69 #define SPIFC_A1_DBUF_ADDR GENMASK(7, 0)
70
71 #define SPIFC_A1_DBUF_DATA_REG 0x244
72
73 #define SPIFC_A1_USER_DBUF_ADDR_REG 0x248
74
75 #define SPIFC_A1_BUFFER_SIZE 512U
76
77 #define SPIFC_A1_MAX_HZ 200000000
78 #define SPIFC_A1_MIN_HZ 1000000
79
80 #define SPIFC_A1_USER_CMD(op) ( \
81 SPIFC_A1_USER_CMD_ENABLE | \
82 FIELD_PREP(SPIFC_A1_USER_CMD_CODE, (op)->cmd.opcode) | \
83 FIELD_PREP(SPIFC_A1_USER_CMD_MODE, ilog2((op)->cmd.buswidth)))
84
85 #define SPIFC_A1_USER_ADDR(op) ( \
86 SPIFC_A1_USER_ADDR_ENABLE | \
87 FIELD_PREP(SPIFC_A1_USER_ADDR_MODE, ilog2((op)->addr.buswidth)) | \
88 FIELD_PREP(SPIFC_A1_USER_ADDR_BYTES, (op)->addr.nbytes - 1))
89
90 #define SPIFC_A1_USER_DUMMY(op) ( \
91 SPIFC_A1_USER_DUMMY_ENABLE | \
92 FIELD_PREP(SPIFC_A1_USER_DUMMY_MODE, ilog2((op)->dummy.buswidth)) | \
93 FIELD_PREP(SPIFC_A1_USER_DUMMY_CLK_SYCLES, (op)->dummy.nbytes << 3))
94
95 #define SPIFC_A1_TSLCH_VAL FIELD_PREP(SPIFC_A1_TSLCH, 1)
96 #define SPIFC_A1_TCLSH_VAL FIELD_PREP(SPIFC_A1_TCLSH, 1)
97 #define SPIFC_A1_TSHWL_VAL FIELD_PREP(SPIFC_A1_TSHWL, 7)
98 #define SPIFC_A1_TSHSL2_VAL FIELD_PREP(SPIFC_A1_TSHSL2, 7)
99 #define SPIFC_A1_TSHSL1_VAL FIELD_PREP(SPIFC_A1_TSHSL1, 7)
100 #define SPIFC_A1_TWHSL_VAL FIELD_PREP(SPIFC_A1_TWHSL, 2)
101 #define SPIFC_A1_ACTIMING0_VAL (SPIFC_A1_TSLCH_VAL | SPIFC_A1_TCLSH_VAL | \
102 SPIFC_A1_TSHWL_VAL | SPIFC_A1_TSHSL2_VAL | \
103 SPIFC_A1_TSHSL1_VAL | SPIFC_A1_TWHSL_VAL)
104
105 struct amlogic_spifc_a1 {
106 struct spi_controller *ctrl;
107 struct clk *clk;
108 struct device *dev;
109 void __iomem *base;
110 u32 curr_speed_hz;
111 };
112
amlogic_spifc_a1_request(struct amlogic_spifc_a1 * spifc,bool read)113 static int amlogic_spifc_a1_request(struct amlogic_spifc_a1 *spifc, bool read)
114 {
115 u32 mask = SPIFC_A1_USER_REQUEST_FINISH |
116 (read ? SPIFC_A1_USER_DATA_UPDATED : 0);
117 u32 val;
118
119 writel(SPIFC_A1_USER_REQUEST_ENABLE,
120 spifc->base + SPIFC_A1_USER_CTRL0_REG);
121
122 return readl_poll_timeout(spifc->base + SPIFC_A1_USER_CTRL0_REG,
123 val, (val & mask) == mask, 0,
124 200 * USEC_PER_MSEC);
125 }
126
amlogic_spifc_a1_drain_buffer(struct amlogic_spifc_a1 * spifc,char * buf,u32 len)127 static void amlogic_spifc_a1_drain_buffer(struct amlogic_spifc_a1 *spifc,
128 char *buf, u32 len)
129 {
130 u32 data;
131 const u32 count = len / sizeof(data);
132 const u32 pad = len % sizeof(data);
133
134 writel(SPIFC_A1_DBUF_AUTO_UPDATE_ADDR,
135 spifc->base + SPIFC_A1_DBUF_CTRL_REG);
136 ioread32_rep(spifc->base + SPIFC_A1_DBUF_DATA_REG, buf, count);
137
138 if (pad) {
139 data = readl(spifc->base + SPIFC_A1_DBUF_DATA_REG);
140 memcpy(buf + len - pad, &data, pad);
141 }
142 }
143
amlogic_spifc_a1_fill_buffer(struct amlogic_spifc_a1 * spifc,const char * buf,u32 len)144 static void amlogic_spifc_a1_fill_buffer(struct amlogic_spifc_a1 *spifc,
145 const char *buf, u32 len)
146 {
147 u32 data;
148 const u32 count = len / sizeof(data);
149 const u32 pad = len % sizeof(data);
150
151 writel(SPIFC_A1_DBUF_DIR | SPIFC_A1_DBUF_AUTO_UPDATE_ADDR,
152 spifc->base + SPIFC_A1_DBUF_CTRL_REG);
153 iowrite32_rep(spifc->base + SPIFC_A1_DBUF_DATA_REG, buf, count);
154
155 if (pad) {
156 memcpy(&data, buf + len - pad, pad);
157 writel(data, spifc->base + SPIFC_A1_DBUF_DATA_REG);
158 }
159 }
160
amlogic_spifc_a1_user_init(struct amlogic_spifc_a1 * spifc)161 static void amlogic_spifc_a1_user_init(struct amlogic_spifc_a1 *spifc)
162 {
163 writel(0, spifc->base + SPIFC_A1_USER_CTRL0_REG);
164 writel(0, spifc->base + SPIFC_A1_USER_CTRL1_REG);
165 writel(0, spifc->base + SPIFC_A1_USER_CTRL2_REG);
166 writel(0, spifc->base + SPIFC_A1_USER_CTRL3_REG);
167 }
168
amlogic_spifc_a1_set_cmd(struct amlogic_spifc_a1 * spifc,u32 cmd_cfg)169 static void amlogic_spifc_a1_set_cmd(struct amlogic_spifc_a1 *spifc,
170 u32 cmd_cfg)
171 {
172 u32 val;
173
174 val = readl(spifc->base + SPIFC_A1_USER_CTRL1_REG);
175 val &= ~(SPIFC_A1_USER_CMD_MODE | SPIFC_A1_USER_CMD_CODE);
176 val |= cmd_cfg;
177 writel(val, spifc->base + SPIFC_A1_USER_CTRL1_REG);
178 }
179
amlogic_spifc_a1_set_addr(struct amlogic_spifc_a1 * spifc,u32 addr,u32 addr_cfg)180 static void amlogic_spifc_a1_set_addr(struct amlogic_spifc_a1 *spifc, u32 addr,
181 u32 addr_cfg)
182 {
183 u32 val;
184
185 writel(addr, spifc->base + SPIFC_A1_USER_ADDR_REG);
186
187 val = readl(spifc->base + SPIFC_A1_USER_CTRL1_REG);
188 val &= ~(SPIFC_A1_USER_ADDR_MODE | SPIFC_A1_USER_ADDR_BYTES);
189 val |= addr_cfg;
190 writel(val, spifc->base + SPIFC_A1_USER_CTRL1_REG);
191 }
192
amlogic_spifc_a1_set_dummy(struct amlogic_spifc_a1 * spifc,u32 dummy_cfg)193 static void amlogic_spifc_a1_set_dummy(struct amlogic_spifc_a1 *spifc,
194 u32 dummy_cfg)
195 {
196 u32 val = readl(spifc->base + SPIFC_A1_USER_CTRL2_REG);
197
198 val &= ~(SPIFC_A1_USER_DUMMY_MODE | SPIFC_A1_USER_DUMMY_CLK_SYCLES);
199 val |= dummy_cfg;
200 writel(val, spifc->base + SPIFC_A1_USER_CTRL2_REG);
201 }
202
amlogic_spifc_a1_read(struct amlogic_spifc_a1 * spifc,void * buf,u32 size,u32 mode)203 static int amlogic_spifc_a1_read(struct amlogic_spifc_a1 *spifc, void *buf,
204 u32 size, u32 mode)
205 {
206 u32 val = readl(spifc->base + SPIFC_A1_USER_CTRL3_REG);
207 int ret;
208
209 val &= ~(SPIFC_A1_USER_DIN_MODE | SPIFC_A1_USER_DIN_BYTES);
210 val |= SPIFC_A1_USER_DIN_ENABLE;
211 val |= FIELD_PREP(SPIFC_A1_USER_DIN_MODE, mode);
212 val |= FIELD_PREP(SPIFC_A1_USER_DIN_BYTES, size);
213 writel(val, spifc->base + SPIFC_A1_USER_CTRL3_REG);
214
215 ret = amlogic_spifc_a1_request(spifc, true);
216 if (!ret)
217 amlogic_spifc_a1_drain_buffer(spifc, buf, size);
218
219 return ret;
220 }
221
amlogic_spifc_a1_write(struct amlogic_spifc_a1 * spifc,const void * buf,u32 size,u32 mode)222 static int amlogic_spifc_a1_write(struct amlogic_spifc_a1 *spifc,
223 const void *buf, u32 size, u32 mode)
224 {
225 u32 val;
226
227 amlogic_spifc_a1_fill_buffer(spifc, buf, size);
228
229 val = readl(spifc->base + SPIFC_A1_USER_CTRL1_REG);
230 val &= ~(SPIFC_A1_USER_DOUT_MODE | SPIFC_A1_USER_DOUT_BYTES);
231 val |= FIELD_PREP(SPIFC_A1_USER_DOUT_MODE, mode);
232 val |= FIELD_PREP(SPIFC_A1_USER_DOUT_BYTES, size);
233 val |= SPIFC_A1_USER_DOUT_ENABLE;
234 writel(val, spifc->base + SPIFC_A1_USER_CTRL1_REG);
235
236 return amlogic_spifc_a1_request(spifc, false);
237 }
238
amlogic_spifc_a1_set_freq(struct amlogic_spifc_a1 * spifc,u32 freq)239 static int amlogic_spifc_a1_set_freq(struct amlogic_spifc_a1 *spifc, u32 freq)
240 {
241 int ret;
242
243 if (freq == spifc->curr_speed_hz)
244 return 0;
245
246 ret = clk_set_rate(spifc->clk, freq);
247 if (ret)
248 return ret;
249
250 spifc->curr_speed_hz = freq;
251 return 0;
252 }
253
amlogic_spifc_a1_exec_op(struct spi_mem * mem,const struct spi_mem_op * op)254 static int amlogic_spifc_a1_exec_op(struct spi_mem *mem,
255 const struct spi_mem_op *op)
256 {
257 struct amlogic_spifc_a1 *spifc =
258 spi_controller_get_devdata(mem->spi->controller);
259 size_t data_size = op->data.nbytes;
260 int ret;
261
262 ret = amlogic_spifc_a1_set_freq(spifc, mem->spi->max_speed_hz);
263 if (ret)
264 return ret;
265
266 amlogic_spifc_a1_user_init(spifc);
267 amlogic_spifc_a1_set_cmd(spifc, SPIFC_A1_USER_CMD(op));
268
269 if (op->addr.nbytes)
270 amlogic_spifc_a1_set_addr(spifc, op->addr.val,
271 SPIFC_A1_USER_ADDR(op));
272
273 if (op->dummy.nbytes)
274 amlogic_spifc_a1_set_dummy(spifc, SPIFC_A1_USER_DUMMY(op));
275
276 if (data_size) {
277 u32 mode = ilog2(op->data.buswidth);
278
279 writel(0, spifc->base + SPIFC_A1_USER_DBUF_ADDR_REG);
280
281 if (op->data.dir == SPI_MEM_DATA_IN)
282 ret = amlogic_spifc_a1_read(spifc, op->data.buf.in,
283 data_size, mode);
284 else
285 ret = amlogic_spifc_a1_write(spifc, op->data.buf.out,
286 data_size, mode);
287 } else {
288 ret = amlogic_spifc_a1_request(spifc, false);
289 }
290
291 return ret;
292 }
293
amlogic_spifc_a1_adjust_op_size(struct spi_mem * mem,struct spi_mem_op * op)294 static int amlogic_spifc_a1_adjust_op_size(struct spi_mem *mem,
295 struct spi_mem_op *op)
296 {
297 op->data.nbytes = min(op->data.nbytes, SPIFC_A1_BUFFER_SIZE);
298 return 0;
299 }
300
amlogic_spifc_a1_hw_init(struct amlogic_spifc_a1 * spifc)301 static void amlogic_spifc_a1_hw_init(struct amlogic_spifc_a1 *spifc)
302 {
303 u32 regv;
304
305 regv = readl(spifc->base + SPIFC_A1_AHB_REQ_CTRL_REG);
306 regv &= ~(SPIFC_A1_AHB_REQ_ENABLE);
307 writel(regv, spifc->base + SPIFC_A1_AHB_REQ_CTRL_REG);
308
309 regv = readl(spifc->base + SPIFC_A1_AHB_CTRL_REG);
310 regv &= ~(SPIFC_A1_AHB_BUS_EN);
311 writel(regv, spifc->base + SPIFC_A1_AHB_CTRL_REG);
312
313 writel(SPIFC_A1_ACTIMING0_VAL, spifc->base + SPIFC_A1_ACTIMING0_REG);
314
315 writel(0, spifc->base + SPIFC_A1_USER_DBUF_ADDR_REG);
316 }
317
318 static const struct spi_controller_mem_ops amlogic_spifc_a1_mem_ops = {
319 .exec_op = amlogic_spifc_a1_exec_op,
320 .adjust_op_size = amlogic_spifc_a1_adjust_op_size,
321 };
322
amlogic_spifc_a1_probe(struct platform_device * pdev)323 static int amlogic_spifc_a1_probe(struct platform_device *pdev)
324 {
325 struct spi_controller *ctrl;
326 struct amlogic_spifc_a1 *spifc;
327 int ret;
328
329 ctrl = devm_spi_alloc_host(&pdev->dev, sizeof(*spifc));
330 if (!ctrl)
331 return -ENOMEM;
332
333 spifc = spi_controller_get_devdata(ctrl);
334 platform_set_drvdata(pdev, spifc);
335
336 spifc->dev = &pdev->dev;
337 spifc->ctrl = ctrl;
338
339 spifc->base = devm_platform_ioremap_resource(pdev, 0);
340 if (IS_ERR(spifc->base))
341 return PTR_ERR(spifc->base);
342
343 spifc->clk = devm_clk_get_enabled(spifc->dev, NULL);
344 if (IS_ERR(spifc->clk))
345 return dev_err_probe(spifc->dev, PTR_ERR(spifc->clk),
346 "unable to get clock\n");
347
348 amlogic_spifc_a1_hw_init(spifc);
349
350 pm_runtime_set_autosuspend_delay(spifc->dev, 500);
351 pm_runtime_use_autosuspend(spifc->dev);
352 devm_pm_runtime_enable(spifc->dev);
353
354 ctrl->num_chipselect = 1;
355 ctrl->dev.of_node = pdev->dev.of_node;
356 ctrl->bits_per_word_mask = SPI_BPW_MASK(8);
357 ctrl->auto_runtime_pm = true;
358 ctrl->mem_ops = &amlogic_spifc_a1_mem_ops;
359 ctrl->min_speed_hz = SPIFC_A1_MIN_HZ;
360 ctrl->max_speed_hz = SPIFC_A1_MAX_HZ;
361 ctrl->mode_bits = (SPI_RX_DUAL | SPI_TX_DUAL |
362 SPI_RX_QUAD | SPI_TX_QUAD);
363
364 ret = devm_spi_register_controller(spifc->dev, ctrl);
365 if (ret)
366 return dev_err_probe(spifc->dev, ret,
367 "failed to register spi controller\n");
368
369 return 0;
370 }
371
372 #ifdef CONFIG_PM_SLEEP
amlogic_spifc_a1_suspend(struct device * dev)373 static int amlogic_spifc_a1_suspend(struct device *dev)
374 {
375 struct amlogic_spifc_a1 *spifc = dev_get_drvdata(dev);
376 int ret;
377
378 ret = spi_controller_suspend(spifc->ctrl);
379 if (ret)
380 return ret;
381
382 if (!pm_runtime_suspended(dev))
383 clk_disable_unprepare(spifc->clk);
384
385 return 0;
386 }
387
amlogic_spifc_a1_resume(struct device * dev)388 static int amlogic_spifc_a1_resume(struct device *dev)
389 {
390 struct amlogic_spifc_a1 *spifc = dev_get_drvdata(dev);
391 int ret = 0;
392
393 if (!pm_runtime_suspended(dev)) {
394 ret = clk_prepare_enable(spifc->clk);
395 if (ret)
396 return ret;
397 }
398
399 amlogic_spifc_a1_hw_init(spifc);
400
401 ret = spi_controller_resume(spifc->ctrl);
402 if (ret)
403 clk_disable_unprepare(spifc->clk);
404
405 return ret;
406 }
407 #endif /* CONFIG_PM_SLEEP */
408
409 #ifdef CONFIG_PM
amlogic_spifc_a1_runtime_suspend(struct device * dev)410 static int amlogic_spifc_a1_runtime_suspend(struct device *dev)
411 {
412 struct amlogic_spifc_a1 *spifc = dev_get_drvdata(dev);
413
414 clk_disable_unprepare(spifc->clk);
415
416 return 0;
417 }
418
amlogic_spifc_a1_runtime_resume(struct device * dev)419 static int amlogic_spifc_a1_runtime_resume(struct device *dev)
420 {
421 struct amlogic_spifc_a1 *spifc = dev_get_drvdata(dev);
422 int ret;
423
424 ret = clk_prepare_enable(spifc->clk);
425 if (!ret)
426 amlogic_spifc_a1_hw_init(spifc);
427
428 return ret;
429 }
430 #endif /* CONFIG_PM */
431
432 static const struct dev_pm_ops amlogic_spifc_a1_pm_ops = {
433 SET_SYSTEM_SLEEP_PM_OPS(amlogic_spifc_a1_suspend,
434 amlogic_spifc_a1_resume)
435 SET_RUNTIME_PM_OPS(amlogic_spifc_a1_runtime_suspend,
436 amlogic_spifc_a1_runtime_resume,
437 NULL)
438 };
439
440 #ifdef CONFIG_OF
441 static const struct of_device_id amlogic_spifc_a1_dt_match[] = {
442 { .compatible = "amlogic,a1-spifc", },
443 { },
444 };
445 MODULE_DEVICE_TABLE(of, amlogic_spifc_a1_dt_match);
446 #endif /* CONFIG_OF */
447
448 static struct platform_driver amlogic_spifc_a1_driver = {
449 .probe = amlogic_spifc_a1_probe,
450 .driver = {
451 .name = "amlogic-spifc-a1",
452 .of_match_table = of_match_ptr(amlogic_spifc_a1_dt_match),
453 .pm = &amlogic_spifc_a1_pm_ops,
454 },
455 };
456 module_platform_driver(amlogic_spifc_a1_driver);
457
458 MODULE_AUTHOR("Martin Kurbanov <mmkurbanov@sberdevices.ru>");
459 MODULE_DESCRIPTION("Amlogic A1 SPIFC driver");
460 MODULE_LICENSE("GPL");
461