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[karo-tx-linux.git] / arch / arm / mach-shmobile / pm-rmobile.c
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>
6  * Copyright (C) 2014  Glider bvba
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  */
15 #include <linux/console.h>
16 #include <linux/delay.h>
17 #include <linux/of.h>
18 #include <linux/of_address.h>
19 #include <linux/of_platform.h>
20 #include <linux/platform_device.h>
21 #include <linux/pm.h>
22 #include <linux/pm_clock.h>
23 #include <linux/slab.h>
24
25 #include <asm/io.h>
26
27 #include "pm-rmobile.h"
28
29 /* SYSC */
30 #define SPDCR           0x08    /* SYS Power Down Control Register */
31 #define SWUCR           0x14    /* SYS Wakeup Control Register */
32 #define PSTR            0x80    /* Power Status Register */
33
34 #define PSTR_RETRIES    100
35 #define PSTR_DELAY_US   10
36
37 static int rmobile_pd_power_down(struct generic_pm_domain *genpd)
38 {
39         struct rmobile_pm_domain *rmobile_pd = to_rmobile_pd(genpd);
40         unsigned int mask;
41
42         if (rmobile_pd->bit_shift == ~0)
43                 return -EBUSY;
44
45         mask = 1 << rmobile_pd->bit_shift;
46         if (rmobile_pd->suspend) {
47                 int ret = rmobile_pd->suspend();
48
49                 if (ret)
50                         return ret;
51         }
52
53         if (__raw_readl(rmobile_pd->base + PSTR) & mask) {
54                 unsigned int retry_count;
55                 __raw_writel(mask, rmobile_pd->base + SPDCR);
56
57                 for (retry_count = PSTR_RETRIES; retry_count; retry_count--) {
58                         if (!(__raw_readl(rmobile_pd->base + SPDCR) & mask))
59                                 break;
60                         cpu_relax();
61                 }
62         }
63
64         if (!rmobile_pd->no_debug)
65                 pr_debug("%s: Power off, 0x%08x -> PSTR = 0x%08x\n",
66                          genpd->name, mask,
67                          __raw_readl(rmobile_pd->base + PSTR));
68
69         return 0;
70 }
71
72 static int __rmobile_pd_power_up(struct rmobile_pm_domain *rmobile_pd,
73                                  bool do_resume)
74 {
75         unsigned int mask;
76         unsigned int retry_count;
77         int ret = 0;
78
79         if (rmobile_pd->bit_shift == ~0)
80                 return 0;
81
82         mask = 1 << rmobile_pd->bit_shift;
83         if (__raw_readl(rmobile_pd->base + PSTR) & mask)
84                 goto out;
85
86         __raw_writel(mask, rmobile_pd->base + SWUCR);
87
88         for (retry_count = 2 * PSTR_RETRIES; retry_count; retry_count--) {
89                 if (!(__raw_readl(rmobile_pd->base + SWUCR) & mask))
90                         break;
91                 if (retry_count > PSTR_RETRIES)
92                         udelay(PSTR_DELAY_US);
93                 else
94                         cpu_relax();
95         }
96         if (!retry_count)
97                 ret = -EIO;
98
99         if (!rmobile_pd->no_debug)
100                 pr_debug("%s: Power on, 0x%08x -> PSTR = 0x%08x\n",
101                          rmobile_pd->genpd.name, mask,
102                          __raw_readl(rmobile_pd->base + PSTR));
103
104 out:
105         if (ret == 0 && rmobile_pd->resume && do_resume)
106                 rmobile_pd->resume();
107
108         return ret;
109 }
110
111 static int rmobile_pd_power_up(struct generic_pm_domain *genpd)
112 {
113         return __rmobile_pd_power_up(to_rmobile_pd(genpd), true);
114 }
115
116 static bool rmobile_pd_active_wakeup(struct device *dev)
117 {
118         return true;
119 }
120
121 static int rmobile_pd_attach_dev(struct generic_pm_domain *domain,
122                                  struct device *dev)
123 {
124         int error;
125
126         error = pm_clk_create(dev);
127         if (error) {
128                 dev_err(dev, "pm_clk_create failed %d\n", error);
129                 return error;
130         }
131
132         error = pm_clk_add(dev, NULL);
133         if (error) {
134                 dev_err(dev, "pm_clk_add failed %d\n", error);
135                 goto fail;
136         }
137
138         return 0;
139
140 fail:
141         pm_clk_destroy(dev);
142         return error;
143 }
144
145 static void rmobile_pd_detach_dev(struct generic_pm_domain *domain,
146                                   struct device *dev)
147 {
148         pm_clk_destroy(dev);
149 }
150
151 static void rmobile_init_pm_domain(struct rmobile_pm_domain *rmobile_pd)
152 {
153         struct generic_pm_domain *genpd = &rmobile_pd->genpd;
154         struct dev_power_governor *gov = rmobile_pd->gov;
155
156         genpd->flags = GENPD_FLAG_PM_CLK;
157         pm_genpd_init(genpd, gov ? : &simple_qos_governor, false);
158         genpd->dev_ops.active_wakeup    = rmobile_pd_active_wakeup;
159         genpd->power_off                = rmobile_pd_power_down;
160         genpd->power_on                 = rmobile_pd_power_up;
161         genpd->attach_dev               = rmobile_pd_attach_dev;
162         genpd->detach_dev               = rmobile_pd_detach_dev;
163         __rmobile_pd_power_up(rmobile_pd, false);
164 }
165
166 #ifdef CONFIG_ARCH_SHMOBILE_LEGACY
167
168 void rmobile_init_domains(struct rmobile_pm_domain domains[], int num)
169 {
170         int j;
171
172         for (j = 0; j < num; j++)
173                 rmobile_init_pm_domain(&domains[j]);
174 }
175
176 void rmobile_add_device_to_domain_td(const char *domain_name,
177                                      struct platform_device *pdev,
178                                      struct gpd_timing_data *td)
179 {
180         struct device *dev = &pdev->dev;
181
182         __pm_genpd_name_add_device(domain_name, dev, td);
183 }
184
185 void rmobile_add_devices_to_domains(struct pm_domain_device data[],
186                                     int size)
187 {
188         struct gpd_timing_data latencies = {
189                 .stop_latency_ns = DEFAULT_DEV_LATENCY_NS,
190                 .start_latency_ns = DEFAULT_DEV_LATENCY_NS,
191                 .save_state_latency_ns = DEFAULT_DEV_LATENCY_NS,
192                 .restore_state_latency_ns = DEFAULT_DEV_LATENCY_NS,
193         };
194         int j;
195
196         for (j = 0; j < size; j++)
197                 rmobile_add_device_to_domain_td(data[j].domain_name,
198                                                 data[j].pdev, &latencies);
199 }
200
201 #else /* !CONFIG_ARCH_SHMOBILE_LEGACY */
202
203 static int rmobile_pd_suspend_busy(void)
204 {
205         /*
206          * This domain should not be turned off.
207          */
208         return -EBUSY;
209 }
210
211 static int rmobile_pd_suspend_console(void)
212 {
213         /*
214          * Serial consoles make use of SCIF hardware located in this domain,
215          * hence keep the power domain on if "no_console_suspend" is set.
216          */
217         return console_suspend_enabled ? 0 : -EBUSY;
218 }
219
220 enum pd_types {
221         PD_NORMAL,
222         PD_CPU,
223         PD_CONSOLE,
224         PD_DEBUG,
225         PD_MEMCTL,
226 };
227
228 #define MAX_NUM_SPECIAL_PDS     16
229
230 static struct special_pd {
231         struct device_node *pd;
232         enum pd_types type;
233 } special_pds[MAX_NUM_SPECIAL_PDS] __initdata;
234
235 static unsigned int num_special_pds __initdata;
236
237 static const struct of_device_id special_ids[] __initconst = {
238         { .compatible = "arm,coresight-etm3x", .data = (void *)PD_DEBUG },
239         { .compatible = "renesas,dbsc-r8a73a4", .data = (void *)PD_MEMCTL, },
240         { .compatible = "renesas,dbsc3-r8a7740", .data = (void *)PD_MEMCTL, },
241         { .compatible = "renesas,sbsc-sh73a0", .data = (void *)PD_MEMCTL, },
242         { /* sentinel */ },
243 };
244
245 static void __init add_special_pd(struct device_node *np, enum pd_types type)
246 {
247         unsigned int i;
248         struct device_node *pd;
249
250         pd = of_parse_phandle(np, "power-domains", 0);
251         if (!pd)
252                 return;
253
254         for (i = 0; i < num_special_pds; i++)
255                 if (pd == special_pds[i].pd && type == special_pds[i].type) {
256                         of_node_put(pd);
257                         return;
258                 }
259
260         if (num_special_pds == ARRAY_SIZE(special_pds)) {
261                 pr_warn("Too many special PM domains\n");
262                 of_node_put(pd);
263                 return;
264         }
265
266         pr_debug("Special PM domain %s type %d for %s\n", pd->name, type,
267                  np->full_name);
268
269         special_pds[num_special_pds].pd = pd;
270         special_pds[num_special_pds].type = type;
271         num_special_pds++;
272 }
273
274 static void __init get_special_pds(void)
275 {
276         struct device_node *np;
277         const struct of_device_id *id;
278
279         /* PM domains containing CPUs */
280         for_each_node_by_type(np, "cpu")
281                 add_special_pd(np, PD_CPU);
282
283         /* PM domain containing console */
284         if (of_stdout)
285                 add_special_pd(of_stdout, PD_CONSOLE);
286
287         /* PM domains containing other special devices */
288         for_each_matching_node_and_match(np, special_ids, &id)
289                 add_special_pd(np, (enum pd_types)id->data);
290 }
291
292 static void __init put_special_pds(void)
293 {
294         unsigned int i;
295
296         for (i = 0; i < num_special_pds; i++)
297                 of_node_put(special_pds[i].pd);
298 }
299
300 static enum pd_types __init pd_type(const struct device_node *pd)
301 {
302         unsigned int i;
303
304         for (i = 0; i < num_special_pds; i++)
305                 if (pd == special_pds[i].pd)
306                         return special_pds[i].type;
307
308         return PD_NORMAL;
309 }
310
311 static void __init rmobile_setup_pm_domain(struct device_node *np,
312                                            struct rmobile_pm_domain *pd)
313 {
314         const char *name = pd->genpd.name;
315
316         switch (pd_type(np)) {
317         case PD_CPU:
318                 /*
319                  * This domain contains the CPU core and therefore it should
320                  * only be turned off if the CPU is not in use.
321                  */
322                 pr_debug("PM domain %s contains CPU\n", name);
323                 pd->gov = &pm_domain_always_on_gov;
324                 pd->suspend = rmobile_pd_suspend_busy;
325                 break;
326
327         case PD_CONSOLE:
328                 pr_debug("PM domain %s contains serial console\n", name);
329                 pd->gov = &pm_domain_always_on_gov;
330                 pd->suspend = rmobile_pd_suspend_console;
331                 break;
332
333         case PD_DEBUG:
334                 /*
335                  * This domain contains the Coresight-ETM hardware block and
336                  * therefore it should only be turned off if the debug module
337                  * is not in use.
338                  */
339                 pr_debug("PM domain %s contains Coresight-ETM\n", name);
340                 pd->gov = &pm_domain_always_on_gov;
341                 pd->suspend = rmobile_pd_suspend_busy;
342                 break;
343
344         case PD_MEMCTL:
345                 /*
346                  * This domain contains a memory-controller and therefore it
347                  * should only be turned off if memory is not in use.
348                  */
349                 pr_debug("PM domain %s contains MEMCTL\n", name);
350                 pd->gov = &pm_domain_always_on_gov;
351                 pd->suspend = rmobile_pd_suspend_busy;
352                 break;
353
354         case PD_NORMAL:
355                 break;
356         }
357
358         rmobile_init_pm_domain(pd);
359 }
360
361 static int __init rmobile_add_pm_domains(void __iomem *base,
362                                          struct device_node *parent,
363                                          struct generic_pm_domain *genpd_parent)
364 {
365         struct device_node *np;
366
367         for_each_child_of_node(parent, np) {
368                 struct rmobile_pm_domain *pd;
369                 u32 idx = ~0;
370
371                 if (of_property_read_u32(np, "reg", &idx)) {
372                         /* always-on domain */
373                 }
374
375                 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
376                 if (!pd)
377                         return -ENOMEM;
378
379                 pd->genpd.name = np->name;
380                 pd->base = base;
381                 pd->bit_shift = idx;
382
383                 rmobile_setup_pm_domain(np, pd);
384                 if (genpd_parent)
385                         pm_genpd_add_subdomain(genpd_parent, &pd->genpd);
386                 of_genpd_add_provider_simple(np, &pd->genpd);
387
388                 rmobile_add_pm_domains(base, np, &pd->genpd);
389         }
390         return 0;
391 }
392
393 static int __init rmobile_init_pm_domains(void)
394 {
395         struct device_node *np, *pmd;
396         bool scanned = false;
397         void __iomem *base;
398         int ret = 0;
399
400         for_each_compatible_node(np, NULL, "renesas,sysc-rmobile") {
401                 base = of_iomap(np, 0);
402                 if (!base) {
403                         pr_warn("%s cannot map reg 0\n", np->full_name);
404                         continue;
405                 }
406
407                 pmd = of_get_child_by_name(np, "pm-domains");
408                 if (!pmd) {
409                         pr_warn("%s lacks pm-domains node\n", np->full_name);
410                         continue;
411                 }
412
413                 if (!scanned) {
414                         /* Find PM domains containing special blocks */
415                         get_special_pds();
416                         scanned = true;
417                 }
418
419                 ret = rmobile_add_pm_domains(base, pmd, NULL);
420                 of_node_put(pmd);
421                 if (ret) {
422                         of_node_put(np);
423                         break;
424                 }
425         }
426
427         put_special_pds();
428
429         return ret;
430 }
431
432 core_initcall(rmobile_init_pm_domains);
433
434 #endif /* !CONFIG_ARCH_SHMOBILE_LEGACY */