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8f45b112 KM |
1 | /* |
2 | * rmobile power management support | |
3 | * | |
4 | * Copyright (C) 2012 Renesas Solutions Corp. | |
5 | * Copyright (C) 2012 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | |
2173fc7c | 6 | * Copyright (C) 2014 Glider bvba |
8f45b112 KM |
7 | * |
8 | * based on pm-sh7372.c | |
9 | * Copyright (C) 2011 Magnus Damm | |
10 | * | |
11 | * This file is subject to the terms and conditions of the GNU General Public | |
12 | * License. See the file "COPYING" in the main directory of this archive | |
13 | * for more details. | |
14 | */ | |
8b98d747 | 15 | #include <linux/clk/shmobile.h> |
8f45b112 KM |
16 | #include <linux/console.h> |
17 | #include <linux/delay.h> | |
2173fc7c GU |
18 | #include <linux/of.h> |
19 | #include <linux/of_address.h> | |
20 | #include <linux/of_platform.h> | |
8f45b112 KM |
21 | #include <linux/platform_device.h> |
22 | #include <linux/pm.h> | |
23 | #include <linux/pm_clock.h> | |
2173fc7c GU |
24 | #include <linux/slab.h> |
25 | ||
8f45b112 | 26 | #include <asm/io.h> |
2173fc7c | 27 | |
6b8b0cb4 | 28 | #include "pm-rmobile.h" |
8f45b112 KM |
29 | |
30 | /* SYSC */ | |
25717b85 GU |
31 | #define SPDCR 0x08 /* SYS Power Down Control Register */ |
32 | #define SWUCR 0x14 /* SYS Wakeup Control Register */ | |
33 | #define PSTR 0x80 /* Power Status Register */ | |
8f45b112 KM |
34 | |
35 | #define PSTR_RETRIES 100 | |
36 | #define PSTR_DELAY_US 10 | |
37 | ||
23758258 GU |
38 | static inline |
39 | struct rmobile_pm_domain *to_rmobile_pd(struct generic_pm_domain *d) | |
40 | { | |
41 | return container_of(d, struct rmobile_pm_domain, genpd); | |
42 | } | |
43 | ||
8f45b112 KM |
44 | static int rmobile_pd_power_down(struct generic_pm_domain *genpd) |
45 | { | |
46 | struct rmobile_pm_domain *rmobile_pd = to_rmobile_pd(genpd); | |
2173fc7c GU |
47 | unsigned int mask; |
48 | ||
49 | if (rmobile_pd->bit_shift == ~0) | |
50 | return -EBUSY; | |
8f45b112 | 51 | |
23e95fc2 | 52 | mask = BIT(rmobile_pd->bit_shift); |
8f45b112 KM |
53 | if (rmobile_pd->suspend) { |
54 | int ret = rmobile_pd->suspend(); | |
55 | ||
56 | if (ret) | |
57 | return ret; | |
58 | } | |
59 | ||
25717b85 | 60 | if (__raw_readl(rmobile_pd->base + PSTR) & mask) { |
8f45b112 | 61 | unsigned int retry_count; |
25717b85 | 62 | __raw_writel(mask, rmobile_pd->base + SPDCR); |
8f45b112 KM |
63 | |
64 | for (retry_count = PSTR_RETRIES; retry_count; retry_count--) { | |
25717b85 | 65 | if (!(__raw_readl(rmobile_pd->base + SPDCR) & mask)) |
8f45b112 KM |
66 | break; |
67 | cpu_relax(); | |
68 | } | |
69 | } | |
70 | ||
71 | if (!rmobile_pd->no_debug) | |
72 | pr_debug("%s: Power off, 0x%08x -> PSTR = 0x%08x\n", | |
25717b85 GU |
73 | genpd->name, mask, |
74 | __raw_readl(rmobile_pd->base + PSTR)); | |
8f45b112 KM |
75 | |
76 | return 0; | |
77 | } | |
78 | ||
79 | static int __rmobile_pd_power_up(struct rmobile_pm_domain *rmobile_pd, | |
80 | bool do_resume) | |
81 | { | |
2173fc7c | 82 | unsigned int mask; |
8f45b112 KM |
83 | unsigned int retry_count; |
84 | int ret = 0; | |
85 | ||
2173fc7c GU |
86 | if (rmobile_pd->bit_shift == ~0) |
87 | return 0; | |
88 | ||
23e95fc2 | 89 | mask = BIT(rmobile_pd->bit_shift); |
25717b85 | 90 | if (__raw_readl(rmobile_pd->base + PSTR) & mask) |
8f45b112 KM |
91 | goto out; |
92 | ||
25717b85 | 93 | __raw_writel(mask, rmobile_pd->base + SWUCR); |
8f45b112 KM |
94 | |
95 | for (retry_count = 2 * PSTR_RETRIES; retry_count; retry_count--) { | |
25717b85 | 96 | if (!(__raw_readl(rmobile_pd->base + SWUCR) & mask)) |
8f45b112 KM |
97 | break; |
98 | if (retry_count > PSTR_RETRIES) | |
99 | udelay(PSTR_DELAY_US); | |
100 | else | |
101 | cpu_relax(); | |
102 | } | |
103 | if (!retry_count) | |
104 | ret = -EIO; | |
105 | ||
106 | if (!rmobile_pd->no_debug) | |
107 | pr_debug("%s: Power on, 0x%08x -> PSTR = 0x%08x\n", | |
25717b85 GU |
108 | rmobile_pd->genpd.name, mask, |
109 | __raw_readl(rmobile_pd->base + PSTR)); | |
8f45b112 KM |
110 | |
111 | out: | |
112 | if (ret == 0 && rmobile_pd->resume && do_resume) | |
113 | rmobile_pd->resume(); | |
114 | ||
115 | return ret; | |
116 | } | |
117 | ||
118 | static int rmobile_pd_power_up(struct generic_pm_domain *genpd) | |
119 | { | |
120 | return __rmobile_pd_power_up(to_rmobile_pd(genpd), true); | |
121 | } | |
122 | ||
123 | static bool rmobile_pd_active_wakeup(struct device *dev) | |
124 | { | |
ab496b9d | 125 | return true; |
8f45b112 KM |
126 | } |
127 | ||
a62595d3 | 128 | static void rmobile_init_pm_domain(struct rmobile_pm_domain *rmobile_pd) |
8f45b112 KM |
129 | { |
130 | struct generic_pm_domain *genpd = &rmobile_pd->genpd; | |
131 | struct dev_power_governor *gov = rmobile_pd->gov; | |
132 | ||
cffa9138 | 133 | genpd->flags = GENPD_FLAG_PM_CLK; |
8f45b112 | 134 | pm_genpd_init(genpd, gov ? : &simple_qos_governor, false); |
8f45b112 | 135 | genpd->dev_ops.active_wakeup = rmobile_pd_active_wakeup; |
8f45b112 KM |
136 | genpd->power_off = rmobile_pd_power_down; |
137 | genpd->power_on = rmobile_pd_power_up; | |
8b98d747 GU |
138 | genpd->attach_dev = cpg_mstp_attach_dev; |
139 | genpd->detach_dev = cpg_mstp_detach_dev; | |
8f45b112 KM |
140 | __rmobile_pd_power_up(rmobile_pd, false); |
141 | } | |
142 | ||
e43ee86e | 143 | static int rmobile_pd_suspend_busy(void) |
2173fc7c GU |
144 | { |
145 | /* | |
e43ee86e | 146 | * This domain should not be turned off. |
2173fc7c GU |
147 | */ |
148 | return -EBUSY; | |
149 | } | |
150 | ||
151 | static int rmobile_pd_suspend_console(void) | |
152 | { | |
153 | /* | |
154 | * Serial consoles make use of SCIF hardware located in this domain, | |
155 | * hence keep the power domain on if "no_console_suspend" is set. | |
156 | */ | |
157 | return console_suspend_enabled ? 0 : -EBUSY; | |
158 | } | |
159 | ||
60e26435 GU |
160 | enum pd_types { |
161 | PD_NORMAL, | |
162 | PD_CPU, | |
163 | PD_CONSOLE, | |
164 | PD_DEBUG, | |
1632ff16 | 165 | PD_MEMCTL, |
60e26435 | 166 | }; |
2173fc7c | 167 | |
60e26435 | 168 | #define MAX_NUM_SPECIAL_PDS 16 |
2173fc7c | 169 | |
60e26435 GU |
170 | static struct special_pd { |
171 | struct device_node *pd; | |
172 | enum pd_types type; | |
173 | } special_pds[MAX_NUM_SPECIAL_PDS] __initdata; | |
2173fc7c | 174 | |
60e26435 | 175 | static unsigned int num_special_pds __initdata; |
2173fc7c | 176 | |
1632ff16 GU |
177 | static const struct of_device_id special_ids[] __initconst = { |
178 | { .compatible = "arm,coresight-etm3x", .data = (void *)PD_DEBUG }, | |
179 | { .compatible = "renesas,dbsc-r8a73a4", .data = (void *)PD_MEMCTL, }, | |
180 | { .compatible = "renesas,dbsc3-r8a7740", .data = (void *)PD_MEMCTL, }, | |
181 | { .compatible = "renesas,sbsc-sh73a0", .data = (void *)PD_MEMCTL, }, | |
182 | { /* sentinel */ }, | |
183 | }; | |
184 | ||
60e26435 GU |
185 | static void __init add_special_pd(struct device_node *np, enum pd_types type) |
186 | { | |
187 | unsigned int i; | |
188 | struct device_node *pd; | |
2173fc7c | 189 | |
60e26435 GU |
190 | pd = of_parse_phandle(np, "power-domains", 0); |
191 | if (!pd) | |
192 | return; | |
2173fc7c | 193 | |
60e26435 GU |
194 | for (i = 0; i < num_special_pds; i++) |
195 | if (pd == special_pds[i].pd && type == special_pds[i].type) { | |
2173fc7c | 196 | of_node_put(pd); |
60e26435 | 197 | return; |
2173fc7c GU |
198 | } |
199 | ||
60e26435 GU |
200 | if (num_special_pds == ARRAY_SIZE(special_pds)) { |
201 | pr_warn("Too many special PM domains\n"); | |
202 | of_node_put(pd); | |
203 | return; | |
2173fc7c GU |
204 | } |
205 | ||
60e26435 GU |
206 | pr_debug("Special PM domain %s type %d for %s\n", pd->name, type, |
207 | np->full_name); | |
208 | ||
209 | special_pds[num_special_pds].pd = pd; | |
210 | special_pds[num_special_pds].type = type; | |
211 | num_special_pds++; | |
212 | } | |
213 | ||
214 | static void __init get_special_pds(void) | |
215 | { | |
216 | struct device_node *np; | |
1632ff16 | 217 | const struct of_device_id *id; |
60e26435 GU |
218 | |
219 | /* PM domains containing CPUs */ | |
220 | for_each_node_by_type(np, "cpu") | |
221 | add_special_pd(np, PD_CPU); | |
222 | ||
2173fc7c GU |
223 | /* PM domain containing console */ |
224 | if (of_stdout) | |
60e26435 | 225 | add_special_pd(of_stdout, PD_CONSOLE); |
2173fc7c | 226 | |
1632ff16 GU |
227 | /* PM domains containing other special devices */ |
228 | for_each_matching_node_and_match(np, special_ids, &id) | |
229 | add_special_pd(np, (enum pd_types)id->data); | |
2173fc7c GU |
230 | } |
231 | ||
232 | static void __init put_special_pds(void) | |
233 | { | |
234 | unsigned int i; | |
235 | ||
60e26435 GU |
236 | for (i = 0; i < num_special_pds; i++) |
237 | of_node_put(special_pds[i].pd); | |
2173fc7c GU |
238 | } |
239 | ||
60e26435 | 240 | static enum pd_types __init pd_type(const struct device_node *pd) |
2173fc7c GU |
241 | { |
242 | unsigned int i; | |
243 | ||
60e26435 GU |
244 | for (i = 0; i < num_special_pds; i++) |
245 | if (pd == special_pds[i].pd) | |
246 | return special_pds[i].type; | |
2173fc7c | 247 | |
60e26435 | 248 | return PD_NORMAL; |
2173fc7c GU |
249 | } |
250 | ||
251 | static void __init rmobile_setup_pm_domain(struct device_node *np, | |
252 | struct rmobile_pm_domain *pd) | |
253 | { | |
254 | const char *name = pd->genpd.name; | |
255 | ||
60e26435 GU |
256 | switch (pd_type(np)) { |
257 | case PD_CPU: | |
e43ee86e GU |
258 | /* |
259 | * This domain contains the CPU core and therefore it should | |
260 | * only be turned off if the CPU is not in use. | |
261 | */ | |
2173fc7c GU |
262 | pr_debug("PM domain %s contains CPU\n", name); |
263 | pd->gov = &pm_domain_always_on_gov; | |
e43ee86e | 264 | pd->suspend = rmobile_pd_suspend_busy; |
60e26435 GU |
265 | break; |
266 | ||
267 | case PD_CONSOLE: | |
2173fc7c GU |
268 | pr_debug("PM domain %s contains serial console\n", name); |
269 | pd->gov = &pm_domain_always_on_gov; | |
270 | pd->suspend = rmobile_pd_suspend_console; | |
60e26435 GU |
271 | break; |
272 | ||
273 | case PD_DEBUG: | |
e43ee86e GU |
274 | /* |
275 | * This domain contains the Coresight-ETM hardware block and | |
276 | * therefore it should only be turned off if the debug module | |
277 | * is not in use. | |
278 | */ | |
2173fc7c GU |
279 | pr_debug("PM domain %s contains Coresight-ETM\n", name); |
280 | pd->gov = &pm_domain_always_on_gov; | |
e43ee86e | 281 | pd->suspend = rmobile_pd_suspend_busy; |
60e26435 GU |
282 | break; |
283 | ||
1632ff16 GU |
284 | case PD_MEMCTL: |
285 | /* | |
286 | * This domain contains a memory-controller and therefore it | |
287 | * should only be turned off if memory is not in use. | |
288 | */ | |
289 | pr_debug("PM domain %s contains MEMCTL\n", name); | |
290 | pd->gov = &pm_domain_always_on_gov; | |
291 | pd->suspend = rmobile_pd_suspend_busy; | |
292 | break; | |
293 | ||
60e26435 GU |
294 | case PD_NORMAL: |
295 | break; | |
2173fc7c GU |
296 | } |
297 | ||
298 | rmobile_init_pm_domain(pd); | |
299 | } | |
300 | ||
301 | static int __init rmobile_add_pm_domains(void __iomem *base, | |
302 | struct device_node *parent, | |
303 | struct generic_pm_domain *genpd_parent) | |
304 | { | |
305 | struct device_node *np; | |
306 | ||
307 | for_each_child_of_node(parent, np) { | |
308 | struct rmobile_pm_domain *pd; | |
309 | u32 idx = ~0; | |
310 | ||
311 | if (of_property_read_u32(np, "reg", &idx)) { | |
312 | /* always-on domain */ | |
313 | } | |
314 | ||
315 | pd = kzalloc(sizeof(*pd), GFP_KERNEL); | |
1fd377b3 JL |
316 | if (!pd) { |
317 | of_node_put(np); | |
2173fc7c | 318 | return -ENOMEM; |
1fd377b3 | 319 | } |
2173fc7c GU |
320 | |
321 | pd->genpd.name = np->name; | |
322 | pd->base = base; | |
323 | pd->bit_shift = idx; | |
324 | ||
325 | rmobile_setup_pm_domain(np, pd); | |
326 | if (genpd_parent) | |
327 | pm_genpd_add_subdomain(genpd_parent, &pd->genpd); | |
328 | of_genpd_add_provider_simple(np, &pd->genpd); | |
329 | ||
330 | rmobile_add_pm_domains(base, np, &pd->genpd); | |
331 | } | |
332 | return 0; | |
333 | } | |
334 | ||
335 | static int __init rmobile_init_pm_domains(void) | |
336 | { | |
337 | struct device_node *np, *pmd; | |
338 | bool scanned = false; | |
339 | void __iomem *base; | |
340 | int ret = 0; | |
341 | ||
342 | for_each_compatible_node(np, NULL, "renesas,sysc-rmobile") { | |
343 | base = of_iomap(np, 0); | |
344 | if (!base) { | |
345 | pr_warn("%s cannot map reg 0\n", np->full_name); | |
346 | continue; | |
347 | } | |
348 | ||
349 | pmd = of_get_child_by_name(np, "pm-domains"); | |
350 | if (!pmd) { | |
351 | pr_warn("%s lacks pm-domains node\n", np->full_name); | |
352 | continue; | |
353 | } | |
354 | ||
355 | if (!scanned) { | |
356 | /* Find PM domains containing special blocks */ | |
357 | get_special_pds(); | |
358 | scanned = true; | |
359 | } | |
360 | ||
361 | ret = rmobile_add_pm_domains(base, pmd, NULL); | |
362 | of_node_put(pmd); | |
363 | if (ret) { | |
364 | of_node_put(np); | |
365 | break; | |
366 | } | |
367 | } | |
368 | ||
369 | put_special_pds(); | |
370 | ||
371 | return ret; | |
372 | } | |
373 | ||
374 | core_initcall(rmobile_init_pm_domains); |