1/*
  2 * power management entry for CSR SiRFprimaII
  3 *
  4 * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
  5 *
  6 * Licensed under GPLv2 or later.
  7 */
  8
  9#include <linux/kernel.h>
 10#include <linux/suspend.h>
 11#include <linux/slab.h>
 12#include <linux/export.h>
 13#include <linux/of.h>
 14#include <linux/of_address.h>
 15#include <linux/of_device.h>
 16#include <linux/of_platform.h>
 17#include <linux/io.h>
 18#include <linux/rtc/sirfsoc_rtciobrg.h>
 19#include <asm/outercache.h>
 20#include <asm/suspend.h>
 21#include <asm/hardware/cache-l2x0.h>
 22
 23#include "pm.h"
 24
 25/*
 26 * suspend asm codes will access these to make DRAM become self-refresh and
 27 * system sleep
 28 */
 29u32 sirfsoc_pwrc_base;
 30void __iomem *sirfsoc_memc_base;
 31
 32static void sirfsoc_set_wakeup_source(void)
 33{
 34	u32 pwr_trigger_en_reg;
 35	pwr_trigger_en_reg = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base +
 36		SIRFSOC_PWRC_TRIGGER_EN);
 37#define X_ON_KEY_B (1 << 0)
 38#define RTC_ALARM0_B (1 << 2)
 39#define RTC_ALARM1_B (1 << 3)
 40	sirfsoc_rtc_iobrg_writel(pwr_trigger_en_reg | X_ON_KEY_B |
 41		RTC_ALARM0_B | RTC_ALARM1_B,
 42		sirfsoc_pwrc_base + SIRFSOC_PWRC_TRIGGER_EN);
 43}
 44
 45static void sirfsoc_set_sleep_mode(u32 mode)
 46{
 47	u32 sleep_mode = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base +
 48		SIRFSOC_PWRC_PDN_CTRL);
 49	sleep_mode &= ~(SIRFSOC_SLEEP_MODE_MASK << 1);
 50	sleep_mode |= mode << 1;
 51	sirfsoc_rtc_iobrg_writel(sleep_mode, sirfsoc_pwrc_base +
 52		SIRFSOC_PWRC_PDN_CTRL);
 53}
 54
 55static int sirfsoc_pre_suspend_power_off(void)
 56{
 57	u32 wakeup_entry = virt_to_phys(cpu_resume);
 58
 59	sirfsoc_rtc_iobrg_writel(wakeup_entry, sirfsoc_pwrc_base +
 60		SIRFSOC_PWRC_SCRATCH_PAD1);
 61
 62	sirfsoc_set_wakeup_source();
 63
 64	sirfsoc_set_sleep_mode(SIRFSOC_DEEP_SLEEP_MODE);
 65
 66	return 0;
 67}
 68
 69static int sirfsoc_pm_enter(suspend_state_t state)
 70{
 71	switch (state) {
 72	case PM_SUSPEND_MEM:
 73		sirfsoc_pre_suspend_power_off();
 74
 75		outer_disable();
 76		/* go zzz */
 77		cpu_suspend(0, sirfsoc_finish_suspend);
 78		outer_resume();
 79		break;
 80	default:
 81		return -EINVAL;
 82	}
 83	return 0;
 84}
 85
 86static const struct platform_suspend_ops sirfsoc_pm_ops = {
 87	.enter = sirfsoc_pm_enter,
 88	.valid = suspend_valid_only_mem,
 89};
 90
 91static const struct of_device_id pwrc_ids[] = {
 92	{ .compatible = "sirf,prima2-pwrc" },
 93	{}
 94};
 95
 96static int __init sirfsoc_of_pwrc_init(void)
 97{
 98	struct device_node *np;
 99
100	np = of_find_matching_node(NULL, pwrc_ids);
101	if (!np) {
102		pr_err("unable to find compatible sirf pwrc node in dtb\n");
103		return -ENOENT;
104	}
105
106	/*
107	 * pwrc behind rtciobrg is not located in memory space
108	 * though the property is named reg. reg only means base
109	 * offset for pwrc. then of_iomap is not suitable here.
110	 */
111	if (of_property_read_u32(np, "reg", &sirfsoc_pwrc_base))
112		panic("unable to find base address of pwrc node in dtb\n");
113
114	of_node_put(np);
115
116	return 0;
117}
118
119static const struct of_device_id memc_ids[] = {
120	{ .compatible = "sirf,prima2-memc" },
121	{}
122};
123
124static int sirfsoc_memc_probe(struct platform_device *op)
125{
126	struct device_node *np = op->dev.of_node;
127
128	sirfsoc_memc_base = of_iomap(np, 0);
129	if (!sirfsoc_memc_base)
130		panic("unable to map memc registers\n");
131
132	return 0;
133}
134
135static struct platform_driver sirfsoc_memc_driver = {
136	.probe		= sirfsoc_memc_probe,
137	.driver = {
138		.name = "sirfsoc-memc",
139		.of_match_table	= memc_ids,
140	},
141};
142
143static int __init sirfsoc_memc_init(void)
144{
145	return platform_driver_register(&sirfsoc_memc_driver);
146}
147
148int __init sirfsoc_pm_init(void)
149{
150	sirfsoc_of_pwrc_init();
151	sirfsoc_memc_init();
152	suspend_set_ops(&sirfsoc_pm_ops);
153	return 0;
154}