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12#include <linux/clk/renesas.h>
13#include <linux/console.h>
14#include <linux/delay.h>
15#include <linux/of.h>
16#include <linux/of_address.h>
17#include <linux/of_platform.h>
18#include <linux/platform_device.h>
19#include <linux/pm.h>
20#include <linux/pm_clock.h>
21#include <linux/pm_domain.h>
22#include <linux/slab.h>
23
24#include <asm/io.h>
25
26
27#define SPDCR 0x08
28#define SWUCR 0x14
29#define PSTR 0x80
30
31#define PSTR_RETRIES 100
32#define PSTR_DELAY_US 10
33
34struct rmobile_pm_domain {
35 struct generic_pm_domain genpd;
36 struct dev_power_governor *gov;
37 int (*suspend)(void);
38 void __iomem *base;
39 unsigned int bit_shift;
40};
41
42static inline
43struct rmobile_pm_domain *to_rmobile_pd(struct generic_pm_domain *d)
44{
45 return container_of(d, struct rmobile_pm_domain, genpd);
46}
47
48static int rmobile_pd_power_down(struct generic_pm_domain *genpd)
49{
50 struct rmobile_pm_domain *rmobile_pd = to_rmobile_pd(genpd);
51 unsigned int mask;
52
53 if (rmobile_pd->bit_shift == ~0)
54 return -EBUSY;
55
56 mask = BIT(rmobile_pd->bit_shift);
57 if (rmobile_pd->suspend) {
58 int ret = rmobile_pd->suspend();
59
60 if (ret)
61 return ret;
62 }
63
64 if (__raw_readl(rmobile_pd->base + PSTR) & mask) {
65 unsigned int retry_count;
66 __raw_writel(mask, rmobile_pd->base + SPDCR);
67
68 for (retry_count = PSTR_RETRIES; retry_count; retry_count--) {
69 if (!(__raw_readl(rmobile_pd->base + SPDCR) & mask))
70 break;
71 cpu_relax();
72 }
73 }
74
75 pr_debug("%s: Power off, 0x%08x -> PSTR = 0x%08x\n", genpd->name, mask,
76 __raw_readl(rmobile_pd->base + PSTR));
77
78 return 0;
79}
80
81static int __rmobile_pd_power_up(struct rmobile_pm_domain *rmobile_pd)
82{
83 unsigned int mask;
84 unsigned int retry_count;
85 int ret = 0;
86
87 if (rmobile_pd->bit_shift == ~0)
88 return 0;
89
90 mask = BIT(rmobile_pd->bit_shift);
91 if (__raw_readl(rmobile_pd->base + PSTR) & mask)
92 return ret;
93
94 __raw_writel(mask, rmobile_pd->base + SWUCR);
95
96 for (retry_count = 2 * PSTR_RETRIES; retry_count; retry_count--) {
97 if (!(__raw_readl(rmobile_pd->base + SWUCR) & mask))
98 break;
99 if (retry_count > PSTR_RETRIES)
100 udelay(PSTR_DELAY_US);
101 else
102 cpu_relax();
103 }
104 if (!retry_count)
105 ret = -EIO;
106
107 pr_debug("%s: Power on, 0x%08x -> PSTR = 0x%08x\n",
108 rmobile_pd->genpd.name, mask,
109 __raw_readl(rmobile_pd->base + PSTR));
110
111 return ret;
112}
113
114static int rmobile_pd_power_up(struct generic_pm_domain *genpd)
115{
116 return __rmobile_pd_power_up(to_rmobile_pd(genpd));
117}
118
119static void rmobile_init_pm_domain(struct rmobile_pm_domain *rmobile_pd)
120{
121 struct generic_pm_domain *genpd = &rmobile_pd->genpd;
122 struct dev_power_governor *gov = rmobile_pd->gov;
123
124 genpd->flags |= GENPD_FLAG_PM_CLK | GENPD_FLAG_ACTIVE_WAKEUP;
125 genpd->power_off = rmobile_pd_power_down;
126 genpd->power_on = rmobile_pd_power_up;
127 genpd->attach_dev = cpg_mstp_attach_dev;
128 genpd->detach_dev = cpg_mstp_detach_dev;
129 __rmobile_pd_power_up(rmobile_pd);
130 pm_genpd_init(genpd, gov ? : &simple_qos_governor, false);
131}
132
133static int rmobile_pd_suspend_console(void)
134{
135
136
137
138
139 return console_suspend_enabled ? 0 : -EBUSY;
140}
141
142enum pd_types {
143 PD_NORMAL,
144 PD_CPU,
145 PD_CONSOLE,
146 PD_DEBUG,
147 PD_MEMCTL,
148};
149
150#define MAX_NUM_SPECIAL_PDS 16
151
152static struct special_pd {
153 struct device_node *pd;
154 enum pd_types type;
155} special_pds[MAX_NUM_SPECIAL_PDS] __initdata;
156
157static unsigned int num_special_pds __initdata;
158
159static const struct of_device_id special_ids[] __initconst = {
160 { .compatible = "arm,coresight-etm3x", .data = (void *)PD_DEBUG },
161 { .compatible = "renesas,dbsc-r8a73a4", .data = (void *)PD_MEMCTL, },
162 { .compatible = "renesas,dbsc3-r8a7740", .data = (void *)PD_MEMCTL, },
163 { .compatible = "renesas,sbsc-sh73a0", .data = (void *)PD_MEMCTL, },
164 { },
165};
166
167static void __init add_special_pd(struct device_node *np, enum pd_types type)
168{
169 unsigned int i;
170 struct device_node *pd;
171
172 pd = of_parse_phandle(np, "power-domains", 0);
173 if (!pd)
174 return;
175
176 for (i = 0; i < num_special_pds; i++)
177 if (pd == special_pds[i].pd && type == special_pds[i].type) {
178 of_node_put(pd);
179 return;
180 }
181
182 if (num_special_pds == ARRAY_SIZE(special_pds)) {
183 pr_warn("Too many special PM domains\n");
184 of_node_put(pd);
185 return;
186 }
187
188 pr_debug("Special PM domain %pOFn type %d for %pOF\n", pd, type, np);
189
190 special_pds[num_special_pds].pd = pd;
191 special_pds[num_special_pds].type = type;
192 num_special_pds++;
193}
194
195static void __init get_special_pds(void)
196{
197 struct device_node *np;
198 const struct of_device_id *id;
199
200
201 for_each_of_cpu_node(np)
202 add_special_pd(np, PD_CPU);
203
204
205 if (of_stdout)
206 add_special_pd(of_stdout, PD_CONSOLE);
207
208
209 for_each_matching_node_and_match(np, special_ids, &id)
210 add_special_pd(np, (enum pd_types)id->data);
211}
212
213static void __init put_special_pds(void)
214{
215 unsigned int i;
216
217 for (i = 0; i < num_special_pds; i++)
218 of_node_put(special_pds[i].pd);
219}
220
221static enum pd_types __init pd_type(const struct device_node *pd)
222{
223 unsigned int i;
224
225 for (i = 0; i < num_special_pds; i++)
226 if (pd == special_pds[i].pd)
227 return special_pds[i].type;
228
229 return PD_NORMAL;
230}
231
232static void __init rmobile_setup_pm_domain(struct device_node *np,
233 struct rmobile_pm_domain *pd)
234{
235 const char *name = pd->genpd.name;
236
237 switch (pd_type(np)) {
238 case PD_CPU:
239
240
241
242
243 pr_debug("PM domain %s contains CPU\n", name);
244 pd->genpd.flags |= GENPD_FLAG_ALWAYS_ON;
245 break;
246
247 case PD_CONSOLE:
248 pr_debug("PM domain %s contains serial console\n", name);
249 pd->gov = &pm_domain_always_on_gov;
250 pd->suspend = rmobile_pd_suspend_console;
251 break;
252
253 case PD_DEBUG:
254
255
256
257
258
259 pr_debug("PM domain %s contains Coresight-ETM\n", name);
260 pd->genpd.flags |= GENPD_FLAG_ALWAYS_ON;
261 break;
262
263 case PD_MEMCTL:
264
265
266
267
268 pr_debug("PM domain %s contains MEMCTL\n", name);
269 pd->genpd.flags |= GENPD_FLAG_ALWAYS_ON;
270 break;
271
272 case PD_NORMAL:
273 break;
274 }
275
276 rmobile_init_pm_domain(pd);
277}
278
279static int __init rmobile_add_pm_domains(void __iomem *base,
280 struct device_node *parent,
281 struct generic_pm_domain *genpd_parent)
282{
283 struct device_node *np;
284
285 for_each_child_of_node(parent, np) {
286 struct rmobile_pm_domain *pd;
287 u32 idx = ~0;
288
289 if (of_property_read_u32(np, "reg", &idx)) {
290
291 }
292
293 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
294 if (!pd) {
295 of_node_put(np);
296 return -ENOMEM;
297 }
298
299 pd->genpd.name = np->name;
300 pd->base = base;
301 pd->bit_shift = idx;
302
303 rmobile_setup_pm_domain(np, pd);
304 if (genpd_parent)
305 pm_genpd_add_subdomain(genpd_parent, &pd->genpd);
306 of_genpd_add_provider_simple(np, &pd->genpd);
307
308 rmobile_add_pm_domains(base, np, &pd->genpd);
309 }
310 return 0;
311}
312
313static int __init rmobile_init_pm_domains(void)
314{
315 struct device_node *np, *pmd;
316 bool scanned = false;
317 void __iomem *base;
318 int ret = 0;
319
320 for_each_compatible_node(np, NULL, "renesas,sysc-rmobile") {
321 base = of_iomap(np, 0);
322 if (!base) {
323 pr_warn("%pOF cannot map reg 0\n", np);
324 continue;
325 }
326
327 pmd = of_get_child_by_name(np, "pm-domains");
328 if (!pmd) {
329 pr_warn("%pOF lacks pm-domains node\n", np);
330 continue;
331 }
332
333 if (!scanned) {
334
335 get_special_pds();
336 scanned = true;
337 }
338
339 ret = rmobile_add_pm_domains(base, pmd, NULL);
340 of_node_put(pmd);
341 if (ret) {
342 of_node_put(np);
343 break;
344 }
345 }
346
347 put_special_pds();
348
349 return ret;
350}
351
352core_initcall(rmobile_init_pm_domains);
353
