--- /dev/null
+/*
+ * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
+ * Author: Tony Xie <tony.xie@rock-chips.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/regmap.h>
+#include <linux/suspend.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regulator/machine.h>
+
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/suspend.h>
+
+#include "pm.h"
+
+/* These enum are option of low power mode */
+enum {
+ ROCKCHIP_ARM_OFF_LOGIC_NORMAL = 0,
+ ROCKCHIP_ARM_OFF_LOGIC_DEEP = 1,
+};
+
+struct rockchip_pm_data {
+ const struct platform_suspend_ops *ops;
+ int (*init)(struct device_node *np);
+};
+
+static void __iomem *rk3288_bootram_base;
+static phys_addr_t rk3288_bootram_phy;
+
+static struct regmap *pmu_regmap;
+static struct regmap *sgrf_regmap;
+
+static u32 rk3288_pmu_pwr_mode_con;
+static u32 rk3288_sgrf_soc_con0;
+
+static inline u32 rk3288_l2_config(void)
+{
+ u32 l2ctlr;
+
+ asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (l2ctlr));
+ return l2ctlr;
+}
+
+static void rk3288_config_bootdata(void)
+{
+ rkpm_bootdata_cpusp = rk3288_bootram_phy + (SZ_4K - 8);
+ rkpm_bootdata_cpu_code = virt_to_phys(cpu_resume);
+
+ rkpm_bootdata_l2ctlr_f = 1;
+ rkpm_bootdata_l2ctlr = rk3288_l2_config();
+}
+
+static void rk3288_slp_mode_set(int level)
+{
+ u32 mode_set, mode_set1;
+
+ regmap_read(sgrf_regmap, RK3288_SGRF_SOC_CON0, &rk3288_sgrf_soc_con0);
+
+ regmap_read(pmu_regmap, RK3288_PMU_PWRMODE_CON,
+ &rk3288_pmu_pwr_mode_con);
+
+ /*
+ * SGRF_FAST_BOOT_EN - system to boot from FAST_BOOT_ADDR
+ * PCLK_WDT_GATE - disable WDT during suspend.
+ */
+ regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
+ SGRF_PCLK_WDT_GATE | SGRF_FAST_BOOT_EN
+ | SGRF_PCLK_WDT_GATE_WRITE | SGRF_FAST_BOOT_EN_WRITE);
+
+ /*
+ * The dapswjdp can not auto reset before resume, that cause it may
+ * access some illegal address during resume. Let's disable it before
+ * suspend, and the MASKROM will enable it back.
+ */
+ regmap_write(sgrf_regmap, RK3288_SGRF_CPU_CON0, SGRF_DAPDEVICEEN_WRITE);
+
+ /* booting address of resuming system is from this register value */
+ regmap_write(sgrf_regmap, RK3288_SGRF_FAST_BOOT_ADDR,
+ rk3288_bootram_phy);
+
+ regmap_write(pmu_regmap, RK3288_PMU_WAKEUP_CFG1,
+ PMU_ARMINT_WAKEUP_EN);
+
+ mode_set = BIT(PMU_GLOBAL_INT_DISABLE) | BIT(PMU_L2FLUSH_EN) |
+ BIT(PMU_SREF0_ENTER_EN) | BIT(PMU_SREF1_ENTER_EN) |
+ BIT(PMU_DDR0_GATING_EN) | BIT(PMU_DDR1_GATING_EN) |
+ BIT(PMU_PWR_MODE_EN) | BIT(PMU_CHIP_PD_EN) |
+ BIT(PMU_SCU_EN);
+
+ mode_set1 = BIT(PMU_CLR_CORE) | BIT(PMU_CLR_CPUP);
+
+ if (level == ROCKCHIP_ARM_OFF_LOGIC_DEEP) {
+ /* arm off, logic deep sleep */
+ mode_set |= BIT(PMU_BUS_PD_EN) |
+ BIT(PMU_DDR1IO_RET_EN) | BIT(PMU_DDR0IO_RET_EN) |
+ BIT(PMU_OSC_24M_DIS) | BIT(PMU_PMU_USE_LF) |
+ BIT(PMU_ALIVE_USE_LF) | BIT(PMU_PLL_PD_EN);
+
+ mode_set1 |= BIT(PMU_CLR_ALIVE) | BIT(PMU_CLR_BUS) |
+ BIT(PMU_CLR_PERI) | BIT(PMU_CLR_DMA);
+ } else {
+ /*
+ * arm off, logic normal
+ * if pmu_clk_core_src_gate_en is not set,
+ * wakeup will be error
+ */
+ mode_set |= BIT(PMU_CLK_CORE_SRC_GATE_EN);
+ }
+
+ regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON, mode_set);
+ regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON1, mode_set1);
+}
+
+static void rk3288_slp_mode_set_resume(void)
+{
+ regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON,
+ rk3288_pmu_pwr_mode_con);
+
+ regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
+ rk3288_sgrf_soc_con0 | SGRF_PCLK_WDT_GATE_WRITE
+ | SGRF_FAST_BOOT_EN_WRITE);
+}
+
+static int rockchip_lpmode_enter(unsigned long arg)
+{
+ flush_cache_all();
+
+ cpu_do_idle();
+
+ pr_err("%s: Failed to suspend\n", __func__);
+
+ return 1;
+}
+
+static int rk3288_suspend_enter(suspend_state_t state)
+{
+ local_fiq_disable();
+
+ rk3288_slp_mode_set(ROCKCHIP_ARM_OFF_LOGIC_NORMAL);
+
+ cpu_suspend(0, rockchip_lpmode_enter);
+
+ rk3288_slp_mode_set_resume();
+
+ local_fiq_enable();
+
+ return 0;
+}
+
+static int rk3288_suspend_prepare(void)
+{
+ return regulator_suspend_prepare(PM_SUSPEND_MEM);
+}
+
+static void rk3288_suspend_finish(void)
+{
+ if (regulator_suspend_finish())
+ pr_err("%s: Suspend finish failed\n", __func__);
+}
+
+static int rk3288_suspend_init(struct device_node *np)
+{
+ struct device_node *sram_np;
+ struct resource res;
+ int ret;
+
+ pmu_regmap = syscon_node_to_regmap(np);
+ if (IS_ERR(pmu_regmap)) {
+ pr_err("%s: could not find pmu regmap\n", __func__);
+ return PTR_ERR(pmu_regmap);
+ }
+
+ sgrf_regmap = syscon_regmap_lookup_by_compatible(
+ "rockchip,rk3288-sgrf");
+ if (IS_ERR(sgrf_regmap)) {
+ pr_err("%s: could not find sgrf regmap\n", __func__);
+ return PTR_ERR(pmu_regmap);
+ }
+
+ sram_np = of_find_compatible_node(NULL, NULL,
+ "rockchip,rk3288-pmu-sram");
+ if (!sram_np) {
+ pr_err("%s: could not find bootram dt node\n", __func__);
+ return -ENODEV;
+ }
+
+ rk3288_bootram_base = of_iomap(sram_np, 0);
+ if (!rk3288_bootram_base) {
+ pr_err("%s: could not map bootram base\n", __func__);
+ return -ENOMEM;
+ }
+
+ ret = of_address_to_resource(sram_np, 0, &res);
+ if (ret) {
+ pr_err("%s: could not get bootram phy addr\n", __func__);
+ return ret;
+ }
+ rk3288_bootram_phy = res.start;
+
+ of_node_put(sram_np);
+
+ rk3288_config_bootdata();
+
+ /* copy resume code and data to bootsram */
+ memcpy(rk3288_bootram_base, rockchip_slp_cpu_resume,
+ rk3288_bootram_sz);
+
+ regmap_write(pmu_regmap, RK3288_PMU_OSC_CNT, OSC_STABL_CNT_THRESH);
+ regmap_write(pmu_regmap, RK3288_PMU_STABL_CNT, PMU_STABL_CNT_THRESH);
+
+ return 0;
+}
+
+static const struct platform_suspend_ops rk3288_suspend_ops = {
+ .enter = rk3288_suspend_enter,
+ .valid = suspend_valid_only_mem,
+ .prepare = rk3288_suspend_prepare,
+ .finish = rk3288_suspend_finish,
+};
+
+static const struct rockchip_pm_data rk3288_pm_data __initconst = {
+ .ops = &rk3288_suspend_ops,
+ .init = rk3288_suspend_init,
+};
+
+static const struct of_device_id rockchip_pmu_of_device_ids[] __initconst = {
+ {
+ .compatible = "rockchip,rk3288-pmu",
+ .data = &rk3288_pm_data,
+ },
+ { /* sentinel */ },
+};
+
+void __init rockchip_suspend_init(void)
+{
+ const struct rockchip_pm_data *pm_data;
+ const struct of_device_id *match;
+ struct device_node *np;
+ int ret;
+
+ np = of_find_matching_node_and_match(NULL, rockchip_pmu_of_device_ids,
+ &match);
+ if (!match) {
+ pr_err("Failed to find PMU node\n");
+ return;
+ }
+ pm_data = (struct rockchip_pm_data *) match->data;
+
+ if (pm_data->init) {
+ ret = pm_data->init(np);
+
+ if (ret) {
+ pr_err("%s: matches init error %d\n", __func__, ret);
+ return;
+ }
+ }
+
+ suspend_set_ops(pm_data->ops);
+}
Code Review / kvmfornfv.git / blobdiff