2 * rmobile power management support
4 * Copyright (C) 2012 Renesas Solutions Corp.
5 * Copyright (C) 2012 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
8 * Copyright (C) 2011 Magnus Damm
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
14 #include <linux/console.h>
15 #include <linux/delay.h>
16 #include <linux/platform_device.h>
18 #include <linux/pm_clock.h>
20 #include <mach/pm-rmobile.h>
23 #define SPDCR IOMEM(0xe6180008)
24 #define SWUCR IOMEM(0xe6180014)
25 #define PSTR IOMEM(0xe6180080)
27 #define PSTR_RETRIES 100
28 #define PSTR_DELAY_US 10
31 static int rmobile_pd_power_down(struct generic_pm_domain *genpd)
33 struct rmobile_pm_domain *rmobile_pd = to_rmobile_pd(genpd);
34 unsigned int mask = 1 << rmobile_pd->bit_shift;
36 if (rmobile_pd->suspend) {
37 int ret = rmobile_pd->suspend();
43 if (__raw_readl(PSTR) & mask) {
44 unsigned int retry_count;
45 __raw_writel(mask, SPDCR);
47 for (retry_count = PSTR_RETRIES; retry_count; retry_count--) {
48 if (!(__raw_readl(SPDCR) & mask))
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));
61 static int __rmobile_pd_power_up(struct rmobile_pm_domain *rmobile_pd,
64 unsigned int mask = 1 << rmobile_pd->bit_shift;
65 unsigned int retry_count;
68 if (__raw_readl(PSTR) & mask)
71 __raw_writel(mask, SWUCR);
73 for (retry_count = 2 * PSTR_RETRIES; retry_count; retry_count--) {
74 if (!(__raw_readl(SWUCR) & mask))
76 if (retry_count > PSTR_RETRIES)
77 udelay(PSTR_DELAY_US);
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));
89 if (ret == 0 && rmobile_pd->resume && do_resume)
95 static int rmobile_pd_power_up(struct generic_pm_domain *genpd)
97 return __rmobile_pd_power_up(to_rmobile_pd(genpd), true);
100 static bool rmobile_pd_active_wakeup(struct device *dev)
102 bool (*active_wakeup)(struct device *dev);
104 active_wakeup = dev_gpd_data(dev)->ops.active_wakeup;
105 return active_wakeup ? active_wakeup(dev) : true;
108 static int rmobile_pd_stop_dev(struct device *dev)
110 int (*stop)(struct device *dev);
112 stop = dev_gpd_data(dev)->ops.stop;
118 return pm_clk_suspend(dev);
121 static int rmobile_pd_start_dev(struct device *dev)
123 int (*start)(struct device *dev);
126 ret = pm_clk_resume(dev);
130 start = dev_gpd_data(dev)->ops.start;
137 static void rmobile_init_pm_domain(struct rmobile_pm_domain *rmobile_pd)
139 struct generic_pm_domain *genpd = &rmobile_pd->genpd;
140 struct dev_power_governor *gov = rmobile_pd->gov;
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);
152 void rmobile_init_domains(struct rmobile_pm_domain domains[], int num)
156 for (j = 0; j < num; j++)
157 rmobile_init_pm_domain(&domains[j]);
160 void rmobile_add_device_to_domain_td(const char *domain_name,
161 struct platform_device *pdev,
162 struct gpd_timing_data *td)
164 struct device *dev = &pdev->dev;
166 __pm_genpd_name_add_device(domain_name, dev, td);
167 if (pm_clk_no_clocks(dev))
168 pm_clk_add(dev, NULL);
171 void rmobile_add_devices_to_domains(struct pm_domain_device data[],
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,
182 for (j = 0; j < size; j++)
183 rmobile_add_device_to_domain_td(data[j].domain_name,
184 data[j].pdev, &latencies);
186 #endif /* CONFIG_PM */