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-rw-r--r--kernel/arch/arm/mach-imx/pm-imx5.c235
1 files changed, 235 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-imx/pm-imx5.c b/kernel/arch/arm/mach-imx/pm-imx5.c
new file mode 100644
index 000000000..f1f80ab73
--- /dev/null
+++ b/kernel/arch/arm/mach-imx/pm-imx5.c
@@ -0,0 +1,235 @@
+/*
+ * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+#include <linux/suspend.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <asm/cacheflush.h>
+#include <asm/system_misc.h>
+#include <asm/tlbflush.h>
+
+#include "common.h"
+#include "cpuidle.h"
+#include "hardware.h"
+
+#define MXC_CCM_CLPCR 0x54
+#define MXC_CCM_CLPCR_LPM_OFFSET 0
+#define MXC_CCM_CLPCR_LPM_MASK 0x3
+#define MXC_CCM_CLPCR_STBY_COUNT_OFFSET 9
+#define MXC_CCM_CLPCR_VSTBY (0x1 << 8)
+#define MXC_CCM_CLPCR_SBYOS (0x1 << 6)
+
+#define MXC_CORTEXA8_PLAT_LPC 0xc
+#define MXC_CORTEXA8_PLAT_LPC_DSM (1 << 0)
+#define MXC_CORTEXA8_PLAT_LPC_DBG_DSM (1 << 1)
+
+#define MXC_SRPG_NEON_SRPGCR 0x280
+#define MXC_SRPG_ARM_SRPGCR 0x2a0
+#define MXC_SRPG_EMPGC0_SRPGCR 0x2c0
+#define MXC_SRPG_EMPGC1_SRPGCR 0x2d0
+
+#define MXC_SRPGCR_PCR 1
+
+/*
+ * The WAIT_UNCLOCKED_POWER_OFF state only requires <= 500ns to exit.
+ * This is also the lowest power state possible without affecting
+ * non-cpu parts of the system. For these reasons, imx5 should default
+ * to always using this state for cpu idling. The PM_SUSPEND_STANDBY also
+ * uses this state and needs to take no action when registers remain confgiured
+ * for this state.
+ */
+#define IMX5_DEFAULT_CPU_IDLE_STATE WAIT_UNCLOCKED_POWER_OFF
+
+struct imx5_pm_data {
+ phys_addr_t cortex_addr;
+ phys_addr_t gpc_addr;
+};
+
+static const struct imx5_pm_data imx51_pm_data __initconst = {
+ .cortex_addr = 0x83fa0000,
+ .gpc_addr = 0x73fd8000,
+};
+
+static const struct imx5_pm_data imx53_pm_data __initconst = {
+ .cortex_addr = 0x63fa0000,
+ .gpc_addr = 0x53fd8000,
+};
+
+static void __iomem *ccm_base;
+static void __iomem *cortex_base;
+static void __iomem *gpc_base;
+
+void __init imx5_pm_set_ccm_base(void __iomem *base)
+{
+ ccm_base = base;
+}
+
+/*
+ * set cpu low power mode before WFI instruction. This function is called
+ * mx5 because it can be used for mx51, and mx53.
+ */
+static void mx5_cpu_lp_set(enum mxc_cpu_pwr_mode mode)
+{
+ u32 plat_lpc, arm_srpgcr, ccm_clpcr;
+ u32 empgc0, empgc1;
+ int stop_mode = 0;
+
+ /* always allow platform to issue a deep sleep mode request */
+ plat_lpc = __raw_readl(cortex_base + MXC_CORTEXA8_PLAT_LPC) &
+ ~(MXC_CORTEXA8_PLAT_LPC_DSM);
+ ccm_clpcr = __raw_readl(ccm_base + MXC_CCM_CLPCR) &
+ ~(MXC_CCM_CLPCR_LPM_MASK);
+ arm_srpgcr = __raw_readl(gpc_base + MXC_SRPG_ARM_SRPGCR) &
+ ~(MXC_SRPGCR_PCR);
+ empgc0 = __raw_readl(gpc_base + MXC_SRPG_EMPGC0_SRPGCR) &
+ ~(MXC_SRPGCR_PCR);
+ empgc1 = __raw_readl(gpc_base + MXC_SRPG_EMPGC1_SRPGCR) &
+ ~(MXC_SRPGCR_PCR);
+
+ switch (mode) {
+ case WAIT_CLOCKED:
+ break;
+ case WAIT_UNCLOCKED:
+ ccm_clpcr |= 0x1 << MXC_CCM_CLPCR_LPM_OFFSET;
+ break;
+ case WAIT_UNCLOCKED_POWER_OFF:
+ case STOP_POWER_OFF:
+ plat_lpc |= MXC_CORTEXA8_PLAT_LPC_DSM
+ | MXC_CORTEXA8_PLAT_LPC_DBG_DSM;
+ if (mode == WAIT_UNCLOCKED_POWER_OFF) {
+ ccm_clpcr |= 0x1 << MXC_CCM_CLPCR_LPM_OFFSET;
+ ccm_clpcr &= ~MXC_CCM_CLPCR_VSTBY;
+ ccm_clpcr &= ~MXC_CCM_CLPCR_SBYOS;
+ stop_mode = 0;
+ } else {
+ ccm_clpcr |= 0x2 << MXC_CCM_CLPCR_LPM_OFFSET;
+ ccm_clpcr |= 0x3 << MXC_CCM_CLPCR_STBY_COUNT_OFFSET;
+ ccm_clpcr |= MXC_CCM_CLPCR_VSTBY;
+ ccm_clpcr |= MXC_CCM_CLPCR_SBYOS;
+ stop_mode = 1;
+ }
+ arm_srpgcr |= MXC_SRPGCR_PCR;
+ break;
+ case STOP_POWER_ON:
+ ccm_clpcr |= 0x2 << MXC_CCM_CLPCR_LPM_OFFSET;
+ break;
+ default:
+ printk(KERN_WARNING "UNKNOWN cpu power mode: %d\n", mode);
+ return;
+ }
+
+ __raw_writel(plat_lpc, cortex_base + MXC_CORTEXA8_PLAT_LPC);
+ __raw_writel(ccm_clpcr, ccm_base + MXC_CCM_CLPCR);
+ __raw_writel(arm_srpgcr, gpc_base + MXC_SRPG_ARM_SRPGCR);
+ __raw_writel(arm_srpgcr, gpc_base + MXC_SRPG_NEON_SRPGCR);
+
+ if (stop_mode) {
+ empgc0 |= MXC_SRPGCR_PCR;
+ empgc1 |= MXC_SRPGCR_PCR;
+
+ __raw_writel(empgc0, gpc_base + MXC_SRPG_EMPGC0_SRPGCR);
+ __raw_writel(empgc1, gpc_base + MXC_SRPG_EMPGC1_SRPGCR);
+ }
+}
+
+static int mx5_suspend_enter(suspend_state_t state)
+{
+ switch (state) {
+ case PM_SUSPEND_MEM:
+ mx5_cpu_lp_set(STOP_POWER_OFF);
+ break;
+ case PM_SUSPEND_STANDBY:
+ /* DEFAULT_IDLE_STATE already configured */
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (state == PM_SUSPEND_MEM) {
+ local_flush_tlb_all();
+ flush_cache_all();
+
+ /*clear the EMPGC0/1 bits */
+ __raw_writel(0, gpc_base + MXC_SRPG_EMPGC0_SRPGCR);
+ __raw_writel(0, gpc_base + MXC_SRPG_EMPGC1_SRPGCR);
+ }
+ cpu_do_idle();
+
+ /* return registers to default idle state */
+ mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);
+ return 0;
+}
+
+static int mx5_pm_valid(suspend_state_t state)
+{
+ return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
+}
+
+static const struct platform_suspend_ops mx5_suspend_ops = {
+ .valid = mx5_pm_valid,
+ .enter = mx5_suspend_enter,
+};
+
+static inline int imx5_cpu_do_idle(void)
+{
+ int ret = tzic_enable_wake();
+
+ if (likely(!ret))
+ cpu_do_idle();
+
+ return ret;
+}
+
+static void imx5_pm_idle(void)
+{
+ imx5_cpu_do_idle();
+}
+
+static int __init imx5_pm_common_init(const struct imx5_pm_data *data)
+{
+ int ret;
+ struct clk *gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");
+
+ if (IS_ERR(gpc_dvfs_clk))
+ return PTR_ERR(gpc_dvfs_clk);
+
+ ret = clk_prepare_enable(gpc_dvfs_clk);
+ if (ret)
+ return ret;
+
+ arm_pm_idle = imx5_pm_idle;
+
+ cortex_base = ioremap(data->cortex_addr, SZ_16K);
+ gpc_base = ioremap(data->gpc_addr, SZ_16K);
+ WARN_ON(!ccm_base || !cortex_base || !gpc_base);
+
+ /* Set the registers to the default cpu idle state. */
+ mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);
+
+ ret = imx5_cpuidle_init();
+ if (ret)
+ pr_warn("%s: cpuidle init failed %d\n", __func__, ret);
+
+ suspend_set_ops(&mx5_suspend_ops);
+
+ return 0;
+}
+
+void __init imx51_pm_init(void)
+{
+ imx5_pm_common_init(&imx51_pm_data);
+}
+
+void __init imx53_pm_init(void)
+{
+ imx5_pm_common_init(&imx53_pm_data);
+}