ARM: CSR: PM: add sleep entry for SiRFprimaII

This patch adds suspend-to-mem support for prima2. It will make prima2
enter DEEPSLEEP mode while accepting PM_SUSPEND_MEM command.

Signed-off-by: Rongjun Ying <rongjun.ying@csr.com>
Signed-off-by: Barry Song <baohua.song@csr.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

4 files changed, 243 insertions, 0 deletions

diff --git a/arch/arm/mach-prima2/Makefile b/arch/arm/mach-prima2/Makefile
index f49d70b86854..13dd1604d951 100644
--- a/arch/arm/mach-prima2/Makefile
+++ b/arch/arm/mach-prima2/Makefile
@@ -6,3 +6,4 @@ obj-y += prima2.o
 obj-y += rtciobrg.o
 obj-$(CONFIG_DEBUG_LL) += lluart.o
 obj-$(CONFIG_CACHE_L2X0) += l2x0.o
+obj-$(CONFIG_SUSPEND) += pm.o sleep.o
diff --git a/arch/arm/mach-prima2/pm.c b/arch/arm/mach-prima2/pm.c
new file mode 100644
index 000000000000..0ba39f3e16ba
--- /dev/null
+++ b/arch/arm/mach-prima2/pm.c
@@ -0,0 +1,149 @@
+/*
+ * power management entry for CSR SiRFprimaII
+ *
+ * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/suspend.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/io.h>
+#include <linux/rtc/sirfsoc_rtciobrg.h>
+#include <asm/suspend.h>
+#include <asm/hardware/cache-l2x0.h>
+
+#include "pm.h"
+
+/*
+ * suspend asm codes will access these to make DRAM become self-refresh and
+ * system sleep
+ */
+u32 sirfsoc_pwrc_base;
+void __iomem *sirfsoc_memc_base;
+
+static void sirfsoc_set_wakeup_source(void)
+{
+        u32 pwr_trigger_en_reg;
+        pwr_trigger_en_reg = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base +
+                SIRFSOC_PWRC_TRIGGER_EN);
+#define X_ON_KEY_B (1 << 0)
+        sirfsoc_rtc_iobrg_writel(pwr_trigger_en_reg | X_ON_KEY_B,
+                sirfsoc_pwrc_base + SIRFSOC_PWRC_TRIGGER_EN);
+}
+
+static void sirfsoc_set_sleep_mode(u32 mode)
+{
+        u32 sleep_mode = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base +
+                SIRFSOC_PWRC_PDN_CTRL);
+        sleep_mode &= ~(SIRFSOC_SLEEP_MODE_MASK << 1);
+        sleep_mode |= mode << 1;
+        sirfsoc_rtc_iobrg_writel(sleep_mode, sirfsoc_pwrc_base +
+                SIRFSOC_PWRC_PDN_CTRL);
+}
+
+static int sirfsoc_pre_suspend_power_off(void)
+{
+        u32 wakeup_entry = virt_to_phys(cpu_resume);
+
+        sirfsoc_rtc_iobrg_writel(wakeup_entry, sirfsoc_pwrc_base +
+                SIRFSOC_PWRC_SCRATCH_PAD1);
+
+        sirfsoc_set_wakeup_source();
+
+        sirfsoc_set_sleep_mode(SIRFSOC_DEEP_SLEEP_MODE);
+
+        return 0;
+}
+
+static int sirfsoc_pm_enter(suspend_state_t state)
+{
+        switch (state) {
+        case PM_SUSPEND_MEM:
+                sirfsoc_pre_suspend_power_off();
+
+                outer_flush_all();
+                outer_disable();
+                /* go zzz */
+                cpu_suspend(0, sirfsoc_finish_suspend);
+                break;
+        default:
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static const struct platform_suspend_ops sirfsoc_pm_ops = {
+        .enter = sirfsoc_pm_enter,
+        .valid = suspend_valid_only_mem,
+};
+
+static int __init sirfsoc_pm_init(void)
+{
+        suspend_set_ops(&sirfsoc_pm_ops);
+        return 0;
+}
+late_initcall(sirfsoc_pm_init);
+
+static const struct of_device_id pwrc_ids[] = {
+        { .compatible = "sirf,prima2-pwrc" },
+        {}
+};
+
+static int __init sirfsoc_of_pwrc_init(void)
+{
+        struct device_node *np;
+
+        np = of_find_matching_node(NULL, pwrc_ids);
+        if (!np)
+                panic("unable to find compatible pwrc node in dtb\n");
+
+        /*
+         * pwrc behind rtciobrg is not located in memory space
+         * though the property is named reg. reg only means base
+         * offset for pwrc. then of_iomap is not suitable here.
+         */
+        if (of_property_read_u32(np, "reg", &sirfsoc_pwrc_base))
+                panic("unable to find base address of pwrc node in dtb\n");
+
+        of_node_put(np);
+
+        return 0;
+}
+postcore_initcall(sirfsoc_of_pwrc_init);
+
+static const struct of_device_id memc_ids[] = {
+        { .compatible = "sirf,prima2-memc" },
+        {}
+};
+
+static int __devinit sirfsoc_memc_probe(struct platform_device *op)
+{
+        struct device_node *np = op->dev.of_node;
+
+        sirfsoc_memc_base = of_iomap(np, 0);
+        if (!sirfsoc_memc_base)
+                panic("unable to map memc registers\n");
+
+        return 0;
+}
+
+static struct platform_driver sirfsoc_memc_driver = {
+        .probe          = sirfsoc_memc_probe,
+        .driver = {
+                .name = "sirfsoc-memc",
+                .owner = THIS_MODULE,
+                .of_match_table = memc_ids,
+        },
+};
+
+static int __init sirfsoc_memc_init(void)
+{
+        return platform_driver_register(&sirfsoc_memc_driver);
+}
+postcore_initcall(sirfsoc_memc_init);
diff --git a/arch/arm/mach-prima2/pm.h b/arch/arm/mach-prima2/pm.h
new file mode 100644
index 000000000000..bae6d77e01ab
--- /dev/null
+++ b/arch/arm/mach-prima2/pm.h
@@ -0,0 +1,29 @@
+/*
+ * arch/arm/mach-prima2/pm.h
+ *
+ * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#ifndef _MACH_PRIMA2_PM_H_
+#define _MACH_PRIMA2_PM_H_
+
+#define SIRFSOC_PWR_SLEEPFORCE          0x01
+
+#define SIRFSOC_SLEEP_MODE_MASK         0x3
+#define SIRFSOC_DEEP_SLEEP_MODE         0x1
+
+#define SIRFSOC_PWRC_PDN_CTRL           0x0
+#define SIRFSOC_PWRC_PON_OFF            0x4
+#define SIRFSOC_PWRC_TRIGGER_EN         0x8
+#define SIRFSOC_PWRC_PIN_STATUS         0x14
+#define SIRFSOC_PWRC_SCRATCH_PAD1       0x18
+#define SIRFSOC_PWRC_SCRATCH_PAD2       0x1C
+
+#ifndef __ASSEMBLY__
+extern int sirfsoc_finish_suspend(unsigned long);
+#endif
+
+#endif
+
diff --git a/arch/arm/mach-prima2/sleep.S b/arch/arm/mach-prima2/sleep.S
new file mode 100644
index 000000000000..0745abc365fc
--- /dev/null
+++ b/arch/arm/mach-prima2/sleep.S
@@ -0,0 +1,64 @@
+/*
+ * sleep mode for CSR SiRFprimaII
+ *
+ * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#include <linux/linkage.h>
+#include <asm/ptrace.h>
+#include <asm/assembler.h>
+
+#include "pm.h"
+
+#define DENALI_CTL_22_OFF       0x58
+#define DENALI_CTL_112_OFF      0x1c0
+
+        .text
+
+ENTRY(sirfsoc_finish_suspend)
+        @ r5:   mem controller
+        ldr     r0, =sirfsoc_memc_base
+        ldr     r5, [r0]
+        @ r6:   pwrc base offset
+        ldr     r0, =sirfsoc_pwrc_base
+        ldr     r6, [r0]
+        @ r7:   rtc iobrg controller
+        ldr     r0, =sirfsoc_rtciobrg_base
+        ldr     r7, [r0]
+
+        @ Read the power control register and set the
+        @ sleep force bit.
+        add     r0, r6, #SIRFSOC_PWRC_PDN_CTRL
+        bl      __sirfsoc_rtc_iobrg_readl
+        orr     r0,r0,#SIRFSOC_PWR_SLEEPFORCE
+        add     r1, r6, #SIRFSOC_PWRC_PDN_CTRL
+        bl      sirfsoc_rtc_iobrg_pre_writel
+        mov     r1, #0x1
+
+        @ read the MEM ctl register and set the self
+        @ refresh bit
+
+        ldr     r2, [r5, #DENALI_CTL_22_OFF]
+        orr     r2, r2, #0x1
+
+        @ Following code has to run from cache since
+        @ the RAM is going to self refresh mode
+        .align 5
+        str     r2, [r5, #DENALI_CTL_22_OFF]
+
+1:
+        ldr     r4, [r5, #DENALI_CTL_112_OFF]
+        tst     r4, #0x1
+        bne     1b
+
+        @ write SLEEPFORCE through rtc iobridge
+
+        str     r1, [r7]
+        @ wait rtc io bridge sync
+1:
+        ldr     r3, [r7]
+        tst     r3, #0x01
+        bne     1b
+        b .