Commit | Line | Data |
---|---|---|
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> | |
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 */ | |
0a4b04dc AB |
23 | #define SPDCR IOMEM(0xe6180008) |
24 | #define SWUCR IOMEM(0xe6180014) | |
25 | #define PSTR IOMEM(0xe6180080) | |
8f45b112 KM |
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 | ||
a62595d3 | 137 | static void rmobile_init_pm_domain(struct rmobile_pm_domain *rmobile_pd) |
8f45b112 KM |
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 | ||
0d09f450 RW |
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 | ||
455ae3a5 RW |
160 | void rmobile_add_device_to_domain_td(const char *domain_name, |
161 | struct platform_device *pdev, | |
162 | struct gpd_timing_data *td) | |
8f45b112 KM |
163 | { |
164 | struct device *dev = &pdev->dev; | |
165 | ||
455ae3a5 | 166 | __pm_genpd_name_add_device(domain_name, dev, td); |
8f45b112 KM |
167 | if (pm_clk_no_clocks(dev)) |
168 | pm_clk_add(dev, NULL); | |
169 | } | |
170 | ||
ac18e02d RW |
171 | void rmobile_add_devices_to_domains(struct pm_domain_device data[], |
172 | int size) | |
8f45b112 | 173 | { |
ac18e02d RW |
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); | |
8f45b112 KM |
185 | } |
186 | #endif /* CONFIG_PM */ |