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1/*
2 * Copyright 2015-2017 Pengutronix, Lucas Stach <kernel@pengutronix.de>
3 * Copyright 2011-2013 Freescale Semiconductor, Inc.
4 *
5 * The code contained herein is licensed under the GNU General Public
6 * License. You may obtain a copy of the GNU General Public License
7 * Version 2 or later at the following locations:
8 *
9 * http://www.opensource.org/licenses/gpl-license.html
10 * http://www.gnu.org/copyleft/gpl.html
11 */
12
13#include <linux/clk.h>
14#include <linux/delay.h>
15#include <linux/io.h>
16#include <linux/of_device.h>
17#include <linux/platform_device.h>
18#include <linux/pm_domain.h>
19#include <linux/regmap.h>
20#include <linux/regulator/consumer.h>
21
22#define GPC_CNTR 0x000
23
24#define GPC_PGC_CTRL_OFFS 0x0
25#define GPC_PGC_PUPSCR_OFFS 0x4
26#define GPC_PGC_PDNSCR_OFFS 0x8
27#define GPC_PGC_SW2ISO_SHIFT 0x8
28#define GPC_PGC_SW_SHIFT 0x0
29
30#define GPC_PGC_GPU_PDN 0x260
31#define GPC_PGC_GPU_PUPSCR 0x264
32#define GPC_PGC_GPU_PDNSCR 0x268
33
34#define GPU_VPU_PUP_REQ BIT(1)
35#define GPU_VPU_PDN_REQ BIT(0)
36
37#define GPC_CLK_MAX 6
38
39#define PGC_DOMAIN_FLAG_NO_PD BIT(0)
40
41struct imx_pm_domain {
42 struct generic_pm_domain base;
43 struct regmap *regmap;
44 struct regulator *supply;
45 struct clk *clk[GPC_CLK_MAX];
46 int num_clks;
47 unsigned int reg_offs;
48 signed char cntr_pdn_bit;
49 unsigned int ipg_rate_mhz;
50 unsigned int flags;
51};
52
53static inline struct imx_pm_domain *
54to_imx_pm_domain(struct generic_pm_domain *genpd)
55{
56 return container_of(genpd, struct imx_pm_domain, base);
57}
58
59static int imx6_pm_domain_power_off(struct generic_pm_domain *genpd)
60{
61 struct imx_pm_domain *pd = to_imx_pm_domain(genpd);
62 int iso, iso2sw;
63 u32 val;
64
65 if (pd->flags & PGC_DOMAIN_FLAG_NO_PD)
66 return -EBUSY;
67
68 /* Read ISO and ISO2SW power down delays */
69 regmap_read(pd->regmap, pd->reg_offs + GPC_PGC_PUPSCR_OFFS, &val);
70 iso = val & 0x3f;
71 iso2sw = (val >> 8) & 0x3f;
72
73 /* Gate off domain when powered down */
74 regmap_update_bits(pd->regmap, pd->reg_offs + GPC_PGC_CTRL_OFFS,
75 0x1, 0x1);
76
77 /* Request GPC to power down domain */
78 val = BIT(pd->cntr_pdn_bit);
79 regmap_update_bits(pd->regmap, GPC_CNTR, val, val);
80
81 /* Wait ISO + ISO2SW IPG clock cycles */
82 udelay(DIV_ROUND_UP(iso + iso2sw, pd->ipg_rate_mhz));
83
84 if (pd->supply)
85 regulator_disable(pd->supply);
86
87 return 0;
88}
89
90static int imx6_pm_domain_power_on(struct generic_pm_domain *genpd)
91{
92 struct imx_pm_domain *pd = to_imx_pm_domain(genpd);
93 int i, ret, sw, sw2iso;
94 u32 val;
95
96 if (pd->supply) {
97 ret = regulator_enable(pd->supply);
98 if (ret) {
99 pr_err("%s: failed to enable regulator: %d\n",
100 __func__, ret);
101 return ret;
102 }
103 }
104
105 /* Enable reset clocks for all devices in the domain */
106 for (i = 0; i < pd->num_clks; i++)
107 clk_prepare_enable(pd->clk[i]);
108
109 /* Gate off domain when powered down */
110 regmap_update_bits(pd->regmap, pd->reg_offs + GPC_PGC_CTRL_OFFS,
111 0x1, 0x1);
112
113 /* Read ISO and ISO2SW power up delays */
114 regmap_read(pd->regmap, pd->reg_offs + GPC_PGC_PUPSCR_OFFS, &val);
115 sw = val & 0x3f;
116 sw2iso = (val >> 8) & 0x3f;
117
118 /* Request GPC to power up domain */
119 val = BIT(pd->cntr_pdn_bit + 1);
120 regmap_update_bits(pd->regmap, GPC_CNTR, val, val);
121
122 /* Wait ISO + ISO2SW IPG clock cycles */
123 udelay(DIV_ROUND_UP(sw + sw2iso, pd->ipg_rate_mhz));
124
125 /* Disable reset clocks for all devices in the domain */
126 for (i = 0; i < pd->num_clks; i++)
127 clk_disable_unprepare(pd->clk[i]);
128
129 return 0;
130}
131
132static int imx_pgc_get_clocks(struct device *dev, struct imx_pm_domain *domain)
133{
134 int i, ret;
135
136 for (i = 0; ; i++) {
137 struct clk *clk = of_clk_get(dev->of_node, i);
138 if (IS_ERR(clk))
139 break;
140 if (i >= GPC_CLK_MAX) {
141 dev_err(dev, "more than %d clocks\n", GPC_CLK_MAX);
142 ret = -EINVAL;
143 goto clk_err;
144 }
145 domain->clk[i] = clk;
146 }
147 domain->num_clks = i;
148
149 return 0;
150
151clk_err:
152 while (i--)
153 clk_put(domain->clk[i]);
154
155 return ret;
156}
157
158static void imx_pgc_put_clocks(struct imx_pm_domain *domain)
159{
160 int i;
161
162 for (i = domain->num_clks - 1; i >= 0; i--)
163 clk_put(domain->clk[i]);
164}
165
166static int imx_pgc_parse_dt(struct device *dev, struct imx_pm_domain *domain)
167{
168 /* try to get the domain supply regulator */
169 domain->supply = devm_regulator_get_optional(dev, "power");
170 if (IS_ERR(domain->supply)) {
171 if (PTR_ERR(domain->supply) == -ENODEV)
172 domain->supply = NULL;
173 else
174 return PTR_ERR(domain->supply);
175 }
176
177 /* try to get all clocks needed for reset propagation */
178 return imx_pgc_get_clocks(dev, domain);
179}
180
181static int imx_pgc_power_domain_probe(struct platform_device *pdev)
182{
183 struct imx_pm_domain *domain = pdev->dev.platform_data;
184 struct device *dev = &pdev->dev;
185 int ret;
186
187 /* if this PD is associated with a DT node try to parse it */
188 if (dev->of_node) {
189 ret = imx_pgc_parse_dt(dev, domain);
190 if (ret)
191 return ret;
192 }
193
194 /* initially power on the domain */
195 if (domain->base.power_on)
196 domain->base.power_on(&domain->base);
197
198 if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) {
199 pm_genpd_init(&domain->base, NULL, false);
200 ret = of_genpd_add_provider_simple(dev->of_node, &domain->base);
201 if (ret)
202 goto genpd_err;
203 }
204
205 device_link_add(dev, dev->parent, DL_FLAG_AUTOREMOVE);
206
207 return 0;
208
209genpd_err:
210 pm_genpd_remove(&domain->base);
211 imx_pgc_put_clocks(domain);
212
213 return ret;
214}
215
216static int imx_pgc_power_domain_remove(struct platform_device *pdev)
217{
218 struct imx_pm_domain *domain = pdev->dev.platform_data;
219
220 if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) {
221 of_genpd_del_provider(pdev->dev.of_node);
222 pm_genpd_remove(&domain->base);
223 imx_pgc_put_clocks(domain);
224 }
225
226 return 0;
227}
228
229static const struct platform_device_id imx_pgc_power_domain_id[] = {
230 { "imx-pgc-power-domain"},
231 { },
232};
233
234static struct platform_driver imx_pgc_power_domain_driver = {
235 .driver = {
236 .name = "imx-pgc-pd",
237 },
238 .probe = imx_pgc_power_domain_probe,
239 .remove = imx_pgc_power_domain_remove,
240 .id_table = imx_pgc_power_domain_id,
241};
242builtin_platform_driver(imx_pgc_power_domain_driver)
243
244#define GPC_PGC_DOMAIN_ARM 0
245#define GPC_PGC_DOMAIN_PU 1
246#define GPC_PGC_DOMAIN_DISPLAY 2
247
248static struct genpd_power_state imx6_pm_domain_pu_state = {
249 .power_off_latency_ns = 25000,
250 .power_on_latency_ns = 2000000,
251};
252
253static struct imx_pm_domain imx_gpc_domains[] = {
254 {
255 .base = {
256 .name = "ARM",
257 .flags = GENPD_FLAG_ALWAYS_ON,
258 },
259 }, {
260 .base = {
261 .name = "PU",
262 .power_off = imx6_pm_domain_power_off,
263 .power_on = imx6_pm_domain_power_on,
264 .states = &imx6_pm_domain_pu_state,
265 .state_count = 1,
266 },
267 .reg_offs = 0x260,
268 .cntr_pdn_bit = 0,
269 }, {
270 .base = {
271 .name = "DISPLAY",
272 .power_off = imx6_pm_domain_power_off,
273 .power_on = imx6_pm_domain_power_on,
274 },
275 .reg_offs = 0x240,
276 .cntr_pdn_bit = 4,
277 }, {
278 .base = {
279 .name = "PCI",
280 .power_off = imx6_pm_domain_power_off,
281 .power_on = imx6_pm_domain_power_on,
282 },
283 .reg_offs = 0x200,
284 .cntr_pdn_bit = 6,
285 },
286};
287
288struct imx_gpc_dt_data {
289 int num_domains;
290 bool err009619_present;
291};
292
293static const struct imx_gpc_dt_data imx6q_dt_data = {
294 .num_domains = 2,
295 .err009619_present = false,
296};
297
298static const struct imx_gpc_dt_data imx6qp_dt_data = {
299 .num_domains = 2,
300 .err009619_present = true,
301};
302
303static const struct imx_gpc_dt_data imx6sl_dt_data = {
304 .num_domains = 3,
305 .err009619_present = false,
306};
307
308static const struct imx_gpc_dt_data imx6sx_dt_data = {
309 .num_domains = 4,
310 .err009619_present = false,
311};
312
313static const struct of_device_id imx_gpc_dt_ids[] = {
314 { .compatible = "fsl,imx6q-gpc", .data = &imx6q_dt_data },
315 { .compatible = "fsl,imx6qp-gpc", .data = &imx6qp_dt_data },
316 { .compatible = "fsl,imx6sl-gpc", .data = &imx6sl_dt_data },
317 { .compatible = "fsl,imx6sx-gpc", .data = &imx6sx_dt_data },
318 { }
319};
320
321static const struct regmap_config imx_gpc_regmap_config = {
322 .reg_bits = 32,
323 .val_bits = 32,
324 .reg_stride = 4,
325 .max_register = 0x2ac,
326};
327
328static struct generic_pm_domain *imx_gpc_onecell_domains[] = {
329 &imx_gpc_domains[0].base,
330 &imx_gpc_domains[1].base,
331};
332
333static struct genpd_onecell_data imx_gpc_onecell_data = {
334 .domains = imx_gpc_onecell_domains,
335 .num_domains = 2,
336};
337
338static int imx_gpc_old_dt_init(struct device *dev, struct regmap *regmap,
339 unsigned int num_domains)
340{
341 struct imx_pm_domain *domain;
342 int i, ret;
343
344 for (i = 0; i < num_domains; i++) {
345 domain = &imx_gpc_domains[i];
346 domain->regmap = regmap;
347 domain->ipg_rate_mhz = 66;
348
349 if (i == 1) {
350 domain->supply = devm_regulator_get(dev, "pu");
351 if (IS_ERR(domain->supply))
352 return PTR_ERR(domain->supply);
353
354 ret = imx_pgc_get_clocks(dev, domain);
355 if (ret)
356 goto clk_err;
357
358 domain->base.power_on(&domain->base);
359 }
360 }
361
362 for (i = 0; i < num_domains; i++)
363 pm_genpd_init(&imx_gpc_domains[i].base, NULL, false);
364
365 if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) {
366 ret = of_genpd_add_provider_onecell(dev->of_node,
367 &imx_gpc_onecell_data);
368 if (ret)
369 goto genpd_err;
370 }
371
372 return 0;
373
374genpd_err:
375 for (i = 0; i < num_domains; i++)
376 pm_genpd_remove(&imx_gpc_domains[i].base);
377 imx_pgc_put_clocks(&imx_gpc_domains[GPC_PGC_DOMAIN_PU]);
378clk_err:
379 return ret;
380}
381
382static int imx_gpc_probe(struct platform_device *pdev)
383{
384 const struct of_device_id *of_id =
385 of_match_device(imx_gpc_dt_ids, &pdev->dev);
386 const struct imx_gpc_dt_data *of_id_data = of_id->data;
387 struct device_node *pgc_node;
388 struct regmap *regmap;
389 struct resource *res;
390 void __iomem *base;
391 int ret;
392
393 pgc_node = of_get_child_by_name(pdev->dev.of_node, "pgc");
394
395 /* bail out if DT too old and doesn't provide the necessary info */
396 if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells") &&
397 !pgc_node)
398 return 0;
399
400 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
401 base = devm_ioremap_resource(&pdev->dev, res);
402 if (IS_ERR(base))
403 return PTR_ERR(base);
404
405 regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
406 &imx_gpc_regmap_config);
407 if (IS_ERR(regmap)) {
408 ret = PTR_ERR(regmap);
409 dev_err(&pdev->dev, "failed to init regmap: %d\n",
410 ret);
411 return ret;
412 }
413
414 /* Disable PU power down in normal operation if ERR009619 is present */
415 if (of_id_data->err009619_present)
416 imx_gpc_domains[GPC_PGC_DOMAIN_PU].flags |=
417 PGC_DOMAIN_FLAG_NO_PD;
418
419 if (!pgc_node) {
420 ret = imx_gpc_old_dt_init(&pdev->dev, regmap,
421 of_id_data->num_domains);
422 if (ret)
423 return ret;
424 } else {
425 struct imx_pm_domain *domain;
426 struct platform_device *pd_pdev;
427 struct device_node *np;
428 struct clk *ipg_clk;
429 unsigned int ipg_rate_mhz;
430 int domain_index;
431
432 ipg_clk = devm_clk_get(&pdev->dev, "ipg");
433 if (IS_ERR(ipg_clk))
434 return PTR_ERR(ipg_clk);
435 ipg_rate_mhz = clk_get_rate(ipg_clk) / 1000000;
436
437 for_each_child_of_node(pgc_node, np) {
438 ret = of_property_read_u32(np, "reg", &domain_index);
439 if (ret) {
440 of_node_put(np);
441 return ret;
442 }
443 if (domain_index >= of_id_data->num_domains)
444 continue;
445
446 domain = &imx_gpc_domains[domain_index];
447 domain->regmap = regmap;
448 domain->ipg_rate_mhz = ipg_rate_mhz;
449
450 pd_pdev = platform_device_alloc("imx-pgc-power-domain",
451 domain_index);
452 if (!pd_pdev) {
453 of_node_put(np);
454 return -ENOMEM;
455 }
456 pd_pdev->dev.platform_data = domain;
457 pd_pdev->dev.parent = &pdev->dev;
458 pd_pdev->dev.of_node = np;
459
460 ret = platform_device_add(pd_pdev);
461 if (ret) {
462 platform_device_put(pd_pdev);
463 of_node_put(np);
464 return ret;
465 }
466 }
467 }
468
469 return 0;
470}
471
472static int imx_gpc_remove(struct platform_device *pdev)
473{
474 struct device_node *pgc_node;
475 int ret;
476
477 pgc_node = of_get_child_by_name(pdev->dev.of_node, "pgc");
478
479 /* bail out if DT too old and doesn't provide the necessary info */
480 if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells") &&
481 !pgc_node)
482 return 0;
483
484 /*
485 * If the old DT binding is used the toplevel driver needs to
486 * de-register the power domains
487 */
488 if (!pgc_node) {
489 of_genpd_del_provider(pdev->dev.of_node);
490
491 ret = pm_genpd_remove(&imx_gpc_domains[GPC_PGC_DOMAIN_PU].base);
492 if (ret)
493 return ret;
494 imx_pgc_put_clocks(&imx_gpc_domains[GPC_PGC_DOMAIN_PU]);
495
496 ret = pm_genpd_remove(&imx_gpc_domains[GPC_PGC_DOMAIN_ARM].base);
497 if (ret)
498 return ret;
499 }
500
501 return 0;
502}
503
504static struct platform_driver imx_gpc_driver = {
505 .driver = {
506 .name = "imx-gpc",
507 .of_match_table = imx_gpc_dt_ids,
508 },
509 .probe = imx_gpc_probe,
510 .remove = imx_gpc_remove,
511};
512builtin_platform_driver(imx_gpc_driver)