ARM: tegra11x: Define ncpu residency for 2 clusters
[linux-3.10.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  *
7  * based on pm-sh7372.c
8  *  Copyright (C) 2011 Magnus Damm
9  *
10  * This file is subject to the terms and conditions of the GNU General Public
11  * License.  See the file "COPYING" in the main directory of this archive
12  * for more details.
13  */
14 #include <linux/console.h>
15 #include <linux/delay.h>
16 #include <linux/platform_device.h>
17 #include <linux/pm.h>
18 #include <linux/pm_clock.h>
19 #include <asm/io.h>
20 #include <mach/pm-rmobile.h>
21
22 /* SYSC */
23 #define SPDCR           IOMEM(0xe6180008)
24 #define SWUCR           IOMEM(0xe6180014)
25 #define PSTR            IOMEM(0xe6180080)
26
27 #define PSTR_RETRIES    100
28 #define PSTR_DELAY_US   10
29
30 #ifdef CONFIG_PM
31 static int rmobile_pd_power_down(struct generic_pm_domain *genpd)
32 {
33         struct rmobile_pm_domain *rmobile_pd = to_rmobile_pd(genpd);
34         unsigned int mask = 1 << rmobile_pd->bit_shift;
35
36         if (rmobile_pd->suspend) {
37                 int ret = rmobile_pd->suspend();
38
39                 if (ret)
40                         return ret;
41         }
42
43         if (__raw_readl(PSTR) & mask) {
44                 unsigned int retry_count;
45                 __raw_writel(mask, SPDCR);
46
47                 for (retry_count = PSTR_RETRIES; retry_count; retry_count--) {
48                         if (!(__raw_readl(SPDCR) & mask))
49                                 break;
50                         cpu_relax();
51                 }
52         }
53
54         if (!rmobile_pd->no_debug)
55                 pr_debug("%s: Power off, 0x%08x -> PSTR = 0x%08x\n",
56                          genpd->name, mask, __raw_readl(PSTR));
57
58         return 0;
59 }
60
61 static int __rmobile_pd_power_up(struct rmobile_pm_domain *rmobile_pd,
62                                  bool do_resume)
63 {
64         unsigned int mask = 1 << rmobile_pd->bit_shift;
65         unsigned int retry_count;
66         int ret = 0;
67
68         if (__raw_readl(PSTR) & mask)
69                 goto out;
70
71         __raw_writel(mask, SWUCR);
72
73         for (retry_count = 2 * PSTR_RETRIES; retry_count; retry_count--) {
74                 if (!(__raw_readl(SWUCR) & mask))
75                         break;
76                 if (retry_count > PSTR_RETRIES)
77                         udelay(PSTR_DELAY_US);
78                 else
79                         cpu_relax();
80         }
81         if (!retry_count)
82                 ret = -EIO;
83
84         if (!rmobile_pd->no_debug)
85                 pr_debug("%s: Power on, 0x%08x -> PSTR = 0x%08x\n",
86                          rmobile_pd->genpd.name, mask, __raw_readl(PSTR));
87
88 out:
89         if (ret == 0 && rmobile_pd->resume && do_resume)
90                 rmobile_pd->resume();
91
92         return ret;
93 }
94
95 static int rmobile_pd_power_up(struct generic_pm_domain *genpd)
96 {
97         return __rmobile_pd_power_up(to_rmobile_pd(genpd), true);
98 }
99
100 static bool rmobile_pd_active_wakeup(struct device *dev)
101 {
102         bool (*active_wakeup)(struct device *dev);
103
104         active_wakeup = dev_gpd_data(dev)->ops.active_wakeup;
105         return active_wakeup ? active_wakeup(dev) : true;
106 }
107
108 static int rmobile_pd_stop_dev(struct device *dev)
109 {
110         int (*stop)(struct device *dev);
111
112         stop = dev_gpd_data(dev)->ops.stop;
113         if (stop) {
114                 int ret = stop(dev);
115                 if (ret)
116                         return ret;
117         }
118         return pm_clk_suspend(dev);
119 }
120
121 static int rmobile_pd_start_dev(struct device *dev)
122 {
123         int (*start)(struct device *dev);
124         int ret;
125
126         ret = pm_clk_resume(dev);
127         if (ret)
128                 return ret;
129
130         start = dev_gpd_data(dev)->ops.start;
131         if (start)
132                 ret = start(dev);
133
134         return ret;
135 }
136
137 static void rmobile_init_pm_domain(struct rmobile_pm_domain *rmobile_pd)
138 {
139         struct generic_pm_domain *genpd = &rmobile_pd->genpd;
140         struct dev_power_governor *gov = rmobile_pd->gov;
141
142         pm_genpd_init(genpd, gov ? : &simple_qos_governor, false);
143         genpd->dev_ops.stop             = rmobile_pd_stop_dev;
144         genpd->dev_ops.start            = rmobile_pd_start_dev;
145         genpd->dev_ops.active_wakeup    = rmobile_pd_active_wakeup;
146         genpd->dev_irq_safe             = true;
147         genpd->power_off                = rmobile_pd_power_down;
148         genpd->power_on                 = rmobile_pd_power_up;
149         __rmobile_pd_power_up(rmobile_pd, false);
150 }
151
152 void rmobile_init_domains(struct rmobile_pm_domain domains[], int num)
153 {
154         int j;
155
156         for (j = 0; j < num; j++)
157                 rmobile_init_pm_domain(&domains[j]);
158 }
159
160 void rmobile_add_device_to_domain_td(const char *domain_name,
161                                      struct platform_device *pdev,
162                                      struct gpd_timing_data *td)
163 {
164         struct device *dev = &pdev->dev;
165
166         __pm_genpd_name_add_device(domain_name, dev, td);
167         if (pm_clk_no_clocks(dev))
168                 pm_clk_add(dev, NULL);
169 }
170
171 void rmobile_add_devices_to_domains(struct pm_domain_device data[],
172                                     int size)
173 {
174         struct gpd_timing_data latencies = {
175                 .stop_latency_ns = DEFAULT_DEV_LATENCY_NS,
176                 .start_latency_ns = DEFAULT_DEV_LATENCY_NS,
177                 .save_state_latency_ns = DEFAULT_DEV_LATENCY_NS,
178                 .restore_state_latency_ns = DEFAULT_DEV_LATENCY_NS,
179         };
180         int j;
181
182         for (j = 0; j < size; j++)
183                 rmobile_add_device_to_domain_td(data[j].domain_name,
184                                                 data[j].pdev, &latencies);
185 }
186 #endif /* CONFIG_PM */