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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
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2 | /* |
3 | * Copyright (c) 2017 Pengutronix, Oleksij Rempel <kernel@pengutronix.de> | |
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4 | */ |
5 | ||
6 | #include <linux/clk.h> | |
7 | #include <linux/err.h> | |
8 | #include <linux/interrupt.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/mfd/syscon.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/of_address.h> | |
13 | #include <linux/of_device.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/regmap.h> | |
16 | #include <linux/remoteproc.h> | |
17 | ||
18 | #define IMX7D_SRC_SCR 0x0C | |
19 | #define IMX7D_ENABLE_M4 BIT(3) | |
20 | #define IMX7D_SW_M4P_RST BIT(2) | |
21 | #define IMX7D_SW_M4C_RST BIT(1) | |
22 | #define IMX7D_SW_M4C_NON_SCLR_RST BIT(0) | |
23 | ||
24 | #define IMX7D_M4_RST_MASK (IMX7D_ENABLE_M4 | IMX7D_SW_M4P_RST \ | |
25 | | IMX7D_SW_M4C_RST \ | |
26 | | IMX7D_SW_M4C_NON_SCLR_RST) | |
27 | ||
28 | #define IMX7D_M4_START (IMX7D_ENABLE_M4 | IMX7D_SW_M4P_RST \ | |
29 | | IMX7D_SW_M4C_RST) | |
30 | #define IMX7D_M4_STOP IMX7D_SW_M4C_NON_SCLR_RST | |
31 | ||
32 | /* Address: 0x020D8000 */ | |
33 | #define IMX6SX_SRC_SCR 0x00 | |
34 | #define IMX6SX_ENABLE_M4 BIT(22) | |
35 | #define IMX6SX_SW_M4P_RST BIT(12) | |
36 | #define IMX6SX_SW_M4C_NON_SCLR_RST BIT(4) | |
37 | #define IMX6SX_SW_M4C_RST BIT(3) | |
38 | ||
39 | #define IMX6SX_M4_START (IMX6SX_ENABLE_M4 | IMX6SX_SW_M4P_RST \ | |
40 | | IMX6SX_SW_M4C_RST) | |
41 | #define IMX6SX_M4_STOP IMX6SX_SW_M4C_NON_SCLR_RST | |
42 | #define IMX6SX_M4_RST_MASK (IMX6SX_ENABLE_M4 | IMX6SX_SW_M4P_RST \ | |
43 | | IMX6SX_SW_M4C_NON_SCLR_RST \ | |
44 | | IMX6SX_SW_M4C_RST) | |
45 | ||
46 | #define IMX7D_RPROC_MEM_MAX 8 | |
47 | ||
48 | /** | |
49 | * struct imx_rproc_mem - slim internal memory structure | |
50 | * @cpu_addr: MPU virtual address of the memory region | |
51 | * @sys_addr: Bus address used to access the memory region | |
52 | * @size: Size of the memory region | |
53 | */ | |
54 | struct imx_rproc_mem { | |
55 | void __iomem *cpu_addr; | |
56 | phys_addr_t sys_addr; | |
57 | size_t size; | |
58 | }; | |
59 | ||
60 | /* att flags */ | |
61 | /* M4 own area. Can be mapped at probe */ | |
62 | #define ATT_OWN BIT(1) | |
63 | ||
64 | /* address translation table */ | |
65 | struct imx_rproc_att { | |
66 | u32 da; /* device address (From Cortex M4 view)*/ | |
67 | u32 sa; /* system bus address */ | |
68 | u32 size; /* size of reg range */ | |
69 | int flags; | |
70 | }; | |
71 | ||
72 | struct imx_rproc_dcfg { | |
73 | u32 src_reg; | |
74 | u32 src_mask; | |
75 | u32 src_start; | |
76 | u32 src_stop; | |
77 | const struct imx_rproc_att *att; | |
78 | size_t att_size; | |
79 | }; | |
80 | ||
81 | struct imx_rproc { | |
82 | struct device *dev; | |
83 | struct regmap *regmap; | |
84 | struct rproc *rproc; | |
85 | const struct imx_rproc_dcfg *dcfg; | |
86 | struct imx_rproc_mem mem[IMX7D_RPROC_MEM_MAX]; | |
87 | struct clk *clk; | |
88 | }; | |
89 | ||
90 | static const struct imx_rproc_att imx_rproc_att_imx7d[] = { | |
91 | /* dev addr , sys addr , size , flags */ | |
92 | /* OCRAM_S (M4 Boot code) - alias */ | |
93 | { 0x00000000, 0x00180000, 0x00008000, 0 }, | |
94 | /* OCRAM_S (Code) */ | |
95 | { 0x00180000, 0x00180000, 0x00008000, ATT_OWN }, | |
96 | /* OCRAM (Code) - alias */ | |
97 | { 0x00900000, 0x00900000, 0x00020000, 0 }, | |
98 | /* OCRAM_EPDC (Code) - alias */ | |
99 | { 0x00920000, 0x00920000, 0x00020000, 0 }, | |
100 | /* OCRAM_PXP (Code) - alias */ | |
101 | { 0x00940000, 0x00940000, 0x00008000, 0 }, | |
102 | /* TCML (Code) */ | |
103 | { 0x1FFF8000, 0x007F8000, 0x00008000, ATT_OWN }, | |
104 | /* DDR (Code) - alias, first part of DDR (Data) */ | |
105 | { 0x10000000, 0x80000000, 0x0FFF0000, 0 }, | |
106 | ||
107 | /* TCMU (Data) */ | |
108 | { 0x20000000, 0x00800000, 0x00008000, ATT_OWN }, | |
109 | /* OCRAM (Data) */ | |
110 | { 0x20200000, 0x00900000, 0x00020000, 0 }, | |
111 | /* OCRAM_EPDC (Data) */ | |
112 | { 0x20220000, 0x00920000, 0x00020000, 0 }, | |
113 | /* OCRAM_PXP (Data) */ | |
114 | { 0x20240000, 0x00940000, 0x00008000, 0 }, | |
115 | /* DDR (Data) */ | |
116 | { 0x80000000, 0x80000000, 0x60000000, 0 }, | |
117 | }; | |
118 | ||
119 | static const struct imx_rproc_att imx_rproc_att_imx6sx[] = { | |
120 | /* dev addr , sys addr , size , flags */ | |
121 | /* TCML (M4 Boot Code) - alias */ | |
122 | { 0x00000000, 0x007F8000, 0x00008000, 0 }, | |
123 | /* OCRAM_S (Code) */ | |
124 | { 0x00180000, 0x008F8000, 0x00004000, 0 }, | |
125 | /* OCRAM_S (Code) - alias */ | |
126 | { 0x00180000, 0x008FC000, 0x00004000, 0 }, | |
127 | /* TCML (Code) */ | |
128 | { 0x1FFF8000, 0x007F8000, 0x00008000, ATT_OWN }, | |
129 | /* DDR (Code) - alias, first part of DDR (Data) */ | |
130 | { 0x10000000, 0x80000000, 0x0FFF8000, 0 }, | |
131 | ||
132 | /* TCMU (Data) */ | |
133 | { 0x20000000, 0x00800000, 0x00008000, ATT_OWN }, | |
134 | /* OCRAM_S (Data) - alias? */ | |
135 | { 0x208F8000, 0x008F8000, 0x00004000, 0 }, | |
136 | /* DDR (Data) */ | |
137 | { 0x80000000, 0x80000000, 0x60000000, 0 }, | |
138 | }; | |
139 | ||
140 | static const struct imx_rproc_dcfg imx_rproc_cfg_imx7d = { | |
141 | .src_reg = IMX7D_SRC_SCR, | |
142 | .src_mask = IMX7D_M4_RST_MASK, | |
143 | .src_start = IMX7D_M4_START, | |
144 | .src_stop = IMX7D_M4_STOP, | |
145 | .att = imx_rproc_att_imx7d, | |
146 | .att_size = ARRAY_SIZE(imx_rproc_att_imx7d), | |
147 | }; | |
148 | ||
149 | static const struct imx_rproc_dcfg imx_rproc_cfg_imx6sx = { | |
150 | .src_reg = IMX6SX_SRC_SCR, | |
151 | .src_mask = IMX6SX_M4_RST_MASK, | |
152 | .src_start = IMX6SX_M4_START, | |
153 | .src_stop = IMX6SX_M4_STOP, | |
154 | .att = imx_rproc_att_imx6sx, | |
155 | .att_size = ARRAY_SIZE(imx_rproc_att_imx6sx), | |
156 | }; | |
157 | ||
158 | static int imx_rproc_start(struct rproc *rproc) | |
159 | { | |
160 | struct imx_rproc *priv = rproc->priv; | |
161 | const struct imx_rproc_dcfg *dcfg = priv->dcfg; | |
162 | struct device *dev = priv->dev; | |
163 | int ret; | |
164 | ||
165 | ret = regmap_update_bits(priv->regmap, dcfg->src_reg, | |
166 | dcfg->src_mask, dcfg->src_start); | |
167 | if (ret) | |
16a3c637 | 168 | dev_err(dev, "Failed to enable M4!\n"); |
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169 | |
170 | return ret; | |
171 | } | |
172 | ||
173 | static int imx_rproc_stop(struct rproc *rproc) | |
174 | { | |
175 | struct imx_rproc *priv = rproc->priv; | |
176 | const struct imx_rproc_dcfg *dcfg = priv->dcfg; | |
177 | struct device *dev = priv->dev; | |
178 | int ret; | |
179 | ||
180 | ret = regmap_update_bits(priv->regmap, dcfg->src_reg, | |
181 | dcfg->src_mask, dcfg->src_stop); | |
182 | if (ret) | |
16a3c637 | 183 | dev_err(dev, "Failed to stop M4!\n"); |
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184 | |
185 | return ret; | |
186 | } | |
187 | ||
188 | static int imx_rproc_da_to_sys(struct imx_rproc *priv, u64 da, | |
9ce3bf22 | 189 | size_t len, u64 *sys) |
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190 | { |
191 | const struct imx_rproc_dcfg *dcfg = priv->dcfg; | |
192 | int i; | |
193 | ||
194 | /* parse address translation table */ | |
195 | for (i = 0; i < dcfg->att_size; i++) { | |
196 | const struct imx_rproc_att *att = &dcfg->att[i]; | |
197 | ||
198 | if (da >= att->da && da + len < att->da + att->size) { | |
199 | unsigned int offset = da - att->da; | |
200 | ||
201 | *sys = att->sa + offset; | |
202 | return 0; | |
203 | } | |
204 | } | |
205 | ||
9ce3bf22 | 206 | dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%zx\n", |
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207 | da, len); |
208 | return -ENOENT; | |
209 | } | |
210 | ||
9ce3bf22 | 211 | static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len) |
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212 | { |
213 | struct imx_rproc *priv = rproc->priv; | |
214 | void *va = NULL; | |
215 | u64 sys; | |
216 | int i; | |
217 | ||
9ce3bf22 | 218 | if (len == 0) |
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219 | return NULL; |
220 | ||
221 | /* | |
222 | * On device side we have many aliases, so we need to convert device | |
223 | * address (M4) to system bus address first. | |
224 | */ | |
225 | if (imx_rproc_da_to_sys(priv, da, len, &sys)) | |
226 | return NULL; | |
227 | ||
228 | for (i = 0; i < IMX7D_RPROC_MEM_MAX; i++) { | |
229 | if (sys >= priv->mem[i].sys_addr && sys + len < | |
230 | priv->mem[i].sys_addr + priv->mem[i].size) { | |
231 | unsigned int offset = sys - priv->mem[i].sys_addr; | |
232 | /* __force to make sparse happy with type conversion */ | |
233 | va = (__force void *)(priv->mem[i].cpu_addr + offset); | |
234 | break; | |
235 | } | |
236 | } | |
237 | ||
9ce3bf22 CL |
238 | dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%zx va = 0x%p\n", |
239 | da, len, va); | |
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240 | |
241 | return va; | |
242 | } | |
243 | ||
244 | static const struct rproc_ops imx_rproc_ops = { | |
245 | .start = imx_rproc_start, | |
246 | .stop = imx_rproc_stop, | |
247 | .da_to_va = imx_rproc_da_to_va, | |
248 | }; | |
249 | ||
250 | static int imx_rproc_addr_init(struct imx_rproc *priv, | |
251 | struct platform_device *pdev) | |
252 | { | |
253 | const struct imx_rproc_dcfg *dcfg = priv->dcfg; | |
254 | struct device *dev = &pdev->dev; | |
255 | struct device_node *np = dev->of_node; | |
256 | int a, b = 0, err, nph; | |
257 | ||
258 | /* remap required addresses */ | |
259 | for (a = 0; a < dcfg->att_size; a++) { | |
260 | const struct imx_rproc_att *att = &dcfg->att[a]; | |
261 | ||
262 | if (!(att->flags & ATT_OWN)) | |
263 | continue; | |
264 | ||
68c2d645 | 265 | if (b >= IMX7D_RPROC_MEM_MAX) |
a0ff4aa6 OR |
266 | break; |
267 | ||
268 | priv->mem[b].cpu_addr = devm_ioremap(&pdev->dev, | |
269 | att->sa, att->size); | |
68a39a3e | 270 | if (!priv->mem[b].cpu_addr) { |
a0ff4aa6 | 271 | dev_err(dev, "devm_ioremap_resource failed\n"); |
68a39a3e | 272 | return -ENOMEM; |
a0ff4aa6 OR |
273 | } |
274 | priv->mem[b].sys_addr = att->sa; | |
275 | priv->mem[b].size = att->size; | |
276 | b++; | |
277 | } | |
278 | ||
279 | /* memory-region is optional property */ | |
280 | nph = of_count_phandle_with_args(np, "memory-region", NULL); | |
281 | if (nph <= 0) | |
282 | return 0; | |
283 | ||
284 | /* remap optional addresses */ | |
285 | for (a = 0; a < nph; a++) { | |
286 | struct device_node *node; | |
287 | struct resource res; | |
288 | ||
289 | node = of_parse_phandle(np, "memory-region", a); | |
290 | err = of_address_to_resource(node, 0, &res); | |
291 | if (err) { | |
292 | dev_err(dev, "unable to resolve memory region\n"); | |
293 | return err; | |
294 | } | |
295 | ||
68c2d645 | 296 | if (b >= IMX7D_RPROC_MEM_MAX) |
a0ff4aa6 OR |
297 | break; |
298 | ||
299 | priv->mem[b].cpu_addr = devm_ioremap_resource(&pdev->dev, &res); | |
300 | if (IS_ERR(priv->mem[b].cpu_addr)) { | |
301 | dev_err(dev, "devm_ioremap_resource failed\n"); | |
302 | err = PTR_ERR(priv->mem[b].cpu_addr); | |
303 | return err; | |
304 | } | |
305 | priv->mem[b].sys_addr = res.start; | |
306 | priv->mem[b].size = resource_size(&res); | |
307 | b++; | |
308 | } | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static int imx_rproc_probe(struct platform_device *pdev) | |
314 | { | |
315 | struct device *dev = &pdev->dev; | |
316 | struct device_node *np = dev->of_node; | |
317 | struct imx_rproc *priv; | |
318 | struct rproc *rproc; | |
319 | struct regmap_config config = { .name = "imx-rproc" }; | |
320 | const struct imx_rproc_dcfg *dcfg; | |
321 | struct regmap *regmap; | |
322 | int ret; | |
323 | ||
324 | regmap = syscon_regmap_lookup_by_phandle(np, "syscon"); | |
325 | if (IS_ERR(regmap)) { | |
326 | dev_err(dev, "failed to find syscon\n"); | |
327 | return PTR_ERR(regmap); | |
328 | } | |
329 | regmap_attach_dev(dev, regmap, &config); | |
330 | ||
331 | /* set some other name then imx */ | |
332 | rproc = rproc_alloc(dev, "imx-rproc", &imx_rproc_ops, | |
333 | NULL, sizeof(*priv)); | |
99a31adf CJ |
334 | if (!rproc) |
335 | return -ENOMEM; | |
a0ff4aa6 OR |
336 | |
337 | dcfg = of_device_get_match_data(dev); | |
de6f83f8 CJ |
338 | if (!dcfg) { |
339 | ret = -EINVAL; | |
340 | goto err_put_rproc; | |
341 | } | |
a0ff4aa6 OR |
342 | |
343 | priv = rproc->priv; | |
344 | priv->rproc = rproc; | |
345 | priv->regmap = regmap; | |
346 | priv->dcfg = dcfg; | |
347 | priv->dev = dev; | |
348 | ||
349 | dev_set_drvdata(dev, rproc); | |
350 | ||
351 | ret = imx_rproc_addr_init(priv, pdev); | |
352 | if (ret) { | |
16a3c637 | 353 | dev_err(dev, "failed on imx_rproc_addr_init\n"); |
a0ff4aa6 OR |
354 | goto err_put_rproc; |
355 | } | |
356 | ||
357 | priv->clk = devm_clk_get(dev, NULL); | |
358 | if (IS_ERR(priv->clk)) { | |
359 | dev_err(dev, "Failed to get clock\n"); | |
96a30d7f CJ |
360 | ret = PTR_ERR(priv->clk); |
361 | goto err_put_rproc; | |
a0ff4aa6 OR |
362 | } |
363 | ||
364 | /* | |
365 | * clk for M4 block including memory. Should be | |
366 | * enabled before .start for FW transfer. | |
367 | */ | |
368 | ret = clk_prepare_enable(priv->clk); | |
369 | if (ret) { | |
370 | dev_err(&rproc->dev, "Failed to enable clock\n"); | |
96a30d7f | 371 | goto err_put_rproc; |
a0ff4aa6 OR |
372 | } |
373 | ||
374 | ret = rproc_add(rproc); | |
375 | if (ret) { | |
376 | dev_err(dev, "rproc_add failed\n"); | |
377 | goto err_put_clk; | |
378 | } | |
379 | ||
99a31adf | 380 | return 0; |
a0ff4aa6 OR |
381 | |
382 | err_put_clk: | |
383 | clk_disable_unprepare(priv->clk); | |
384 | err_put_rproc: | |
385 | rproc_free(rproc); | |
99a31adf | 386 | |
a0ff4aa6 OR |
387 | return ret; |
388 | } | |
389 | ||
390 | static int imx_rproc_remove(struct platform_device *pdev) | |
391 | { | |
392 | struct rproc *rproc = platform_get_drvdata(pdev); | |
393 | struct imx_rproc *priv = rproc->priv; | |
394 | ||
395 | clk_disable_unprepare(priv->clk); | |
396 | rproc_del(rproc); | |
397 | rproc_free(rproc); | |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
402 | static const struct of_device_id imx_rproc_of_match[] = { | |
403 | { .compatible = "fsl,imx7d-cm4", .data = &imx_rproc_cfg_imx7d }, | |
404 | { .compatible = "fsl,imx6sx-cm4", .data = &imx_rproc_cfg_imx6sx }, | |
405 | {}, | |
406 | }; | |
407 | MODULE_DEVICE_TABLE(of, imx_rproc_of_match); | |
408 | ||
409 | static struct platform_driver imx_rproc_driver = { | |
410 | .probe = imx_rproc_probe, | |
411 | .remove = imx_rproc_remove, | |
412 | .driver = { | |
413 | .name = "imx-rproc", | |
414 | .of_match_table = imx_rproc_of_match, | |
415 | }, | |
416 | }; | |
417 | ||
418 | module_platform_driver(imx_rproc_driver); | |
419 | ||
420 | MODULE_LICENSE("GPL v2"); | |
421 | MODULE_DESCRIPTION("IMX6SX/7D remote processor control driver"); | |
422 | MODULE_AUTHOR("Oleksij Rempel <o.rempel@pengutronix.de>"); |