1 files changed, 428 insertions, 0 deletions

diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c
new file mode 100644
index 000000000000..509a435afd4b
--- /dev/null
+++ b/arch/arm/mach-exynos/pm.c
@@ -0,0 +1,428 @@
+/* linux/arch/arm/mach-exynos4/pm.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com
+ *
+ * EXYNOS4210 - Power Management support
+ *
+ * Based on arch/arm/mach-s3c2410/pm.c
+ * Copyright (c) 2006 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/init.h>
+#include <linux/suspend.h>
+#include <linux/syscore_ops.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+
+#include <asm/cacheflush.h>
+#include <asm/hardware/cache-l2x0.h>
+
+#include <plat/cpu.h>
+#include <plat/pm.h>
+#include <plat/pll.h>
+#include <plat/regs-srom.h>
+
+#include <mach/regs-irq.h>
+#include <mach/regs-gpio.h>
+#include <mach/regs-clock.h>
+#include <mach/regs-pmu.h>
+#include <mach/pm-core.h>
+#include <mach/pmu.h>
+
+static struct sleep_save exynos4_set_clksrc[] = {
+        { .reg = S5P_CLKSRC_MASK_TOP                    , .val = 0x00000001, },
+        { .reg = S5P_CLKSRC_MASK_CAM                    , .val = 0x11111111, },
+        { .reg = S5P_CLKSRC_MASK_TV                     , .val = 0x00000111, },
+        { .reg = S5P_CLKSRC_MASK_LCD0                   , .val = 0x00001111, },
+        { .reg = S5P_CLKSRC_MASK_MAUDIO                 , .val = 0x00000001, },
+        { .reg = S5P_CLKSRC_MASK_FSYS                   , .val = 0x01011111, },
+        { .reg = S5P_CLKSRC_MASK_PERIL0                 , .val = 0x01111111, },
+        { .reg = S5P_CLKSRC_MASK_PERIL1                 , .val = 0x01110111, },
+        { .reg = S5P_CLKSRC_MASK_DMC                    , .val = 0x00010000, },
+};
+
+static struct sleep_save exynos4210_set_clksrc[] = {
+        { .reg = S5P_CLKSRC_MASK_LCD1                   , .val = 0x00001111, },
+};
+
+static struct sleep_save exynos4_epll_save[] = {
+        SAVE_ITEM(S5P_EPLL_CON0),
+        SAVE_ITEM(S5P_EPLL_CON1),
+};
+
+static struct sleep_save exynos4_vpll_save[] = {
+        SAVE_ITEM(S5P_VPLL_CON0),
+        SAVE_ITEM(S5P_VPLL_CON1),
+};
+
+static struct sleep_save exynos4_core_save[] = {
+        /* GIC side */
+        SAVE_ITEM(S5P_VA_GIC_CPU + 0x000),
+        SAVE_ITEM(S5P_VA_GIC_CPU + 0x004),
+        SAVE_ITEM(S5P_VA_GIC_CPU + 0x008),
+        SAVE_ITEM(S5P_VA_GIC_CPU + 0x00C),
+        SAVE_ITEM(S5P_VA_GIC_CPU + 0x014),
+        SAVE_ITEM(S5P_VA_GIC_CPU + 0x018),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x000),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x004),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x100),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x104),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x108),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x300),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x304),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x308),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x400),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x404),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x408),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x40C),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x410),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x414),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x418),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x41C),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x420),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x424),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x428),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x42C),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x430),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x434),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x438),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x43C),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x440),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x444),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x448),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x44C),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x450),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x454),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x458),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x45C),
+
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x800),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x804),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x808),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x80C),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x810),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x814),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x818),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x81C),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x820),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x824),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x828),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x82C),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x830),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x834),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x838),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x83C),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x840),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x844),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x848),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x84C),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x850),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x854),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x858),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0x85C),
+
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0xC00),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0xC04),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0xC08),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0xC0C),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0xC10),
+        SAVE_ITEM(S5P_VA_GIC_DIST + 0xC14),
+
+        SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x000),
+        SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x010),
+        SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x020),
+        SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x030),
+        SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x040),
+        SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x050),
+        SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x060),
+        SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x070),
+        SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x080),
+        SAVE_ITEM(S5P_VA_COMBINER_BASE + 0x090),
+
+        /* SROM side */
+        SAVE_ITEM(S5P_SROM_BW),
+        SAVE_ITEM(S5P_SROM_BC0),
+        SAVE_ITEM(S5P_SROM_BC1),
+        SAVE_ITEM(S5P_SROM_BC2),
+        SAVE_ITEM(S5P_SROM_BC3),
+};
+
+static struct sleep_save exynos4_l2cc_save[] = {
+        SAVE_ITEM(S5P_VA_L2CC + L2X0_TAG_LATENCY_CTRL),
+        SAVE_ITEM(S5P_VA_L2CC + L2X0_DATA_LATENCY_CTRL),
+        SAVE_ITEM(S5P_VA_L2CC + L2X0_PREFETCH_CTRL),
+        SAVE_ITEM(S5P_VA_L2CC + L2X0_POWER_CTRL),
+        SAVE_ITEM(S5P_VA_L2CC + L2X0_AUX_CTRL),
+};
+
+/* For Cortex-A9 Diagnostic and Power control register */
+static unsigned int save_arm_register[2];
+
+static int exynos4_cpu_suspend(unsigned long arg)
+{
+        outer_flush_all();
+
+        /* issue the standby signal into the pm unit. */
+        cpu_do_idle();
+
+        /* we should never get past here */
+        panic("sleep resumed to originator?");
+}
+
+static void exynos4_pm_prepare(void)
+{
+        u32 tmp;
+
+        s3c_pm_do_save(exynos4_core_save, ARRAY_SIZE(exynos4_core_save));
+        s3c_pm_do_save(exynos4_l2cc_save, ARRAY_SIZE(exynos4_l2cc_save));
+        s3c_pm_do_save(exynos4_epll_save, ARRAY_SIZE(exynos4_epll_save));
+        s3c_pm_do_save(exynos4_vpll_save, ARRAY_SIZE(exynos4_vpll_save));
+
+        tmp = __raw_readl(S5P_INFORM1);
+
+        /* Set value of power down register for sleep mode */
+
+        exynos4_sys_powerdown_conf(SYS_SLEEP);
+        __raw_writel(S5P_CHECK_SLEEP, S5P_INFORM1);
+
+        /* ensure at least INFORM0 has the resume address */
+
+        __raw_writel(virt_to_phys(s3c_cpu_resume), S5P_INFORM0);
+
+        /* Before enter central sequence mode, clock src register have to set */
+
+        s3c_pm_do_restore_core(exynos4_set_clksrc, ARRAY_SIZE(exynos4_set_clksrc));
+
+        if (soc_is_exynos4210())
+                s3c_pm_do_restore_core(exynos4210_set_clksrc, ARRAY_SIZE(exynos4210_set_clksrc));
+
+}
+
+static int exynos4_pm_add(struct sys_device *sysdev)
+{
+        pm_cpu_prep = exynos4_pm_prepare;
+        pm_cpu_sleep = exynos4_cpu_suspend;
+
+        return 0;
+}
+
+/* This function copy from linux/arch/arm/kernel/smp_scu.c */
+
+void exynos4_scu_enable(void __iomem *scu_base)
+{
+        u32 scu_ctrl;
+
+        scu_ctrl = __raw_readl(scu_base);
+        /* already enabled? */
+        if (scu_ctrl & 1)
+                return;
+
+        scu_ctrl |= 1;
+        __raw_writel(scu_ctrl, scu_base);
+
+        /*
+         * Ensure that the data accessed by CPU0 before the SCU was
+         * initialised is visible to the other CPUs.
+         */
+        flush_cache_all();
+}
+
+static unsigned long pll_base_rate;
+
+static void exynos4_restore_pll(void)
+{
+        unsigned long pll_con, locktime, lockcnt;
+        unsigned long pll_in_rate;
+        unsigned int p_div, epll_wait = 0, vpll_wait = 0;
+
+        if (pll_base_rate == 0)
+                return;
+
+        pll_in_rate = pll_base_rate;
+
+        /* EPLL */
+        pll_con = exynos4_epll_save[0].val;
+
+        if (pll_con & (1 << 31)) {
+                pll_con &= (PLL46XX_PDIV_MASK << PLL46XX_PDIV_SHIFT);
+                p_div = (pll_con >> PLL46XX_PDIV_SHIFT);
+
+                pll_in_rate /= 1000000;
+
+                locktime = (3000 / pll_in_rate) * p_div;
+                lockcnt = locktime * 10000 / (10000 / pll_in_rate);
+
+                __raw_writel(lockcnt, S5P_EPLL_LOCK);
+
+                s3c_pm_do_restore_core(exynos4_epll_save,
+                                        ARRAY_SIZE(exynos4_epll_save));
+                epll_wait = 1;
+        }
+
+        pll_in_rate = pll_base_rate;
+
+        /* VPLL */
+        pll_con = exynos4_vpll_save[0].val;
+
+        if (pll_con & (1 << 31)) {
+                pll_in_rate /= 1000000;
+                /* 750us */
+                locktime = 750;
+                lockcnt = locktime * 10000 / (10000 / pll_in_rate);
+
+                __raw_writel(lockcnt, S5P_VPLL_LOCK);
+
+                s3c_pm_do_restore_core(exynos4_vpll_save,
+                                        ARRAY_SIZE(exynos4_vpll_save));
+                vpll_wait = 1;
+        }
+
+        /* Wait PLL locking */
+
+        do {
+                if (epll_wait) {
+                        pll_con = __raw_readl(S5P_EPLL_CON0);
+                        if (pll_con & (1 << S5P_EPLLCON0_LOCKED_SHIFT))
+                                epll_wait = 0;
+                }
+
+                if (vpll_wait) {
+                        pll_con = __raw_readl(S5P_VPLL_CON0);
+                        if (pll_con & (1 << S5P_VPLLCON0_LOCKED_SHIFT))
+                                vpll_wait = 0;
+                }
+        } while (epll_wait || vpll_wait);
+}
+
+static struct sysdev_driver exynos4_pm_driver = {
+        .add            = exynos4_pm_add,
+};
+
+static __init int exynos4_pm_drvinit(void)
+{
+        struct clk *pll_base;
+        unsigned int tmp;
+
+        s3c_pm_init();
+
+        /* All wakeup disable */
+
+        tmp = __raw_readl(S5P_WAKEUP_MASK);
+        tmp |= ((0xFF << 8) | (0x1F << 1));
+        __raw_writel(tmp, S5P_WAKEUP_MASK);
+
+        pll_base = clk_get(NULL, "xtal");
+
+        if (!IS_ERR(pll_base)) {
+                pll_base_rate = clk_get_rate(pll_base);
+                clk_put(pll_base);
+        }
+
+        return sysdev_driver_register(&exynos4_sysclass, &exynos4_pm_driver);
+}
+arch_initcall(exynos4_pm_drvinit);
+
+static int exynos4_pm_suspend(void)
+{
+        unsigned long tmp;
+
+        /* Setting Central Sequence Register for power down mode */
+
+        tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
+        tmp &= ~S5P_CENTRAL_LOWPWR_CFG;
+        __raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
+
+        if (soc_is_exynos4212()) {
+                tmp = __raw_readl(S5P_CENTRAL_SEQ_OPTION);
+                tmp &= ~(S5P_USE_STANDBYWFI_ISP_ARM |
+                         S5P_USE_STANDBYWFE_ISP_ARM);
+                __raw_writel(tmp, S5P_CENTRAL_SEQ_OPTION);
+        }
+
+        /* Save Power control register */
+        asm ("mrc p15, 0, %0, c15, c0, 0"
+             : "=r" (tmp) : : "cc");
+        save_arm_register[0] = tmp;
+
+        /* Save Diagnostic register */
+        asm ("mrc p15, 0, %0, c15, c0, 1"
+             : "=r" (tmp) : : "cc");
+        save_arm_register[1] = tmp;
+
+        return 0;
+}
+
+static void exynos4_pm_resume(void)
+{
+        unsigned long tmp;
+
+        /*
+         * If PMU failed while entering sleep mode, WFI will be
+         * ignored by PMU and then exiting cpu_do_idle().
+         * S5P_CENTRAL_LOWPWR_CFG bit will not be set automatically
+         * in this situation.
+         */
+        tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
+        if (!(tmp & S5P_CENTRAL_LOWPWR_CFG)) {
+                tmp |= S5P_CENTRAL_LOWPWR_CFG;
+                __raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
+                /* No need to perform below restore code */
+                goto early_wakeup;
+        }
+        /* Restore Power control register */
+        tmp = save_arm_register[0];
+        asm volatile ("mcr p15, 0, %0, c15, c0, 0"
+                      : : "r" (tmp)
+                      : "cc");
+
+        /* Restore Diagnostic register */
+        tmp = save_arm_register[1];
+        asm volatile ("mcr p15, 0, %0, c15, c0, 1"
+                      : : "r" (tmp)
+                      : "cc");
+
+        /* For release retention */
+
+        __raw_writel((1 << 28), S5P_PAD_RET_MAUDIO_OPTION);
+        __raw_writel((1 << 28), S5P_PAD_RET_GPIO_OPTION);
+        __raw_writel((1 << 28), S5P_PAD_RET_UART_OPTION);
+        __raw_writel((1 << 28), S5P_PAD_RET_MMCA_OPTION);
+        __raw_writel((1 << 28), S5P_PAD_RET_MMCB_OPTION);
+        __raw_writel((1 << 28), S5P_PAD_RET_EBIA_OPTION);
+        __raw_writel((1 << 28), S5P_PAD_RET_EBIB_OPTION);
+
+        s3c_pm_do_restore_core(exynos4_core_save, ARRAY_SIZE(exynos4_core_save));
+
+        exynos4_restore_pll();
+
+        exynos4_scu_enable(S5P_VA_SCU);
+
+#ifdef CONFIG_CACHE_L2X0
+        s3c_pm_do_restore_core(exynos4_l2cc_save, ARRAY_SIZE(exynos4_l2cc_save));
+        outer_inv_all();
+        /* enable L2X0*/
+        writel_relaxed(1, S5P_VA_L2CC + L2X0_CTRL);
+#endif
+
+early_wakeup:
+        return;
+}
+
+static struct syscore_ops exynos4_pm_syscore_ops = {
+        .suspend        = exynos4_pm_suspend,
+        .resume         = exynos4_pm_resume,
+};
+
+static __init int exynos4_pm_syscore_init(void)
+{
+        register_syscore_ops(&exynos4_pm_syscore_ops);
+        return 0;
+}
+arch_initcall(exynos4_pm_syscore_init);