2 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
3 * Author: Tony Xie <tony.xie@rock-chips.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 #include <linux/init.h>
18 #include <linux/kernel.h>
20 #include <linux/of_address.h>
21 #include <linux/regmap.h>
22 #include <linux/suspend.h>
23 #include <linux/mfd/syscon.h>
24 #include <linux/regulator/machine.h>
26 #include <asm/cacheflush.h>
27 #include <asm/tlbflush.h>
28 #include <asm/suspend.h>
32 /* These enum are option of low power mode */
34 ROCKCHIP_ARM_OFF_LOGIC_NORMAL = 0,
35 ROCKCHIP_ARM_OFF_LOGIC_DEEP = 1,
38 struct rockchip_pm_data {
39 const struct platform_suspend_ops *ops;
40 int (*init)(struct device_node *np);
43 static void __iomem *rk3288_bootram_base;
44 static phys_addr_t rk3288_bootram_phy;
46 static struct regmap *pmu_regmap;
47 static struct regmap *sgrf_regmap;
49 static u32 rk3288_pmu_pwr_mode_con;
50 static u32 rk3288_sgrf_soc_con0;
52 static inline u32 rk3288_l2_config(void)
56 asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (l2ctlr));
60 static void rk3288_config_bootdata(void)
62 rkpm_bootdata_cpusp = rk3288_bootram_phy + (SZ_4K - 8);
63 rkpm_bootdata_cpu_code = virt_to_phys(cpu_resume);
65 rkpm_bootdata_l2ctlr_f = 1;
66 rkpm_bootdata_l2ctlr = rk3288_l2_config();
69 static void rk3288_slp_mode_set(int level)
71 u32 mode_set, mode_set1;
73 regmap_read(sgrf_regmap, RK3288_SGRF_SOC_CON0, &rk3288_sgrf_soc_con0);
75 regmap_read(pmu_regmap, RK3288_PMU_PWRMODE_CON,
76 &rk3288_pmu_pwr_mode_con);
79 * SGRF_FAST_BOOT_EN - system to boot from FAST_BOOT_ADDR
80 * PCLK_WDT_GATE - disable WDT during suspend.
82 regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
83 SGRF_PCLK_WDT_GATE | SGRF_FAST_BOOT_EN
84 | SGRF_PCLK_WDT_GATE_WRITE | SGRF_FAST_BOOT_EN_WRITE);
86 /* booting address of resuming system is from this register value */
87 regmap_write(sgrf_regmap, RK3288_SGRF_FAST_BOOT_ADDR,
90 regmap_write(pmu_regmap, RK3288_PMU_WAKEUP_CFG1,
91 PMU_ARMINT_WAKEUP_EN);
93 mode_set = BIT(PMU_GLOBAL_INT_DISABLE) | BIT(PMU_L2FLUSH_EN) |
94 BIT(PMU_SREF0_ENTER_EN) | BIT(PMU_SREF1_ENTER_EN) |
95 BIT(PMU_DDR0_GATING_EN) | BIT(PMU_DDR1_GATING_EN) |
96 BIT(PMU_PWR_MODE_EN) | BIT(PMU_CHIP_PD_EN) |
99 mode_set1 = BIT(PMU_CLR_CORE) | BIT(PMU_CLR_CPUP);
101 if (level == ROCKCHIP_ARM_OFF_LOGIC_DEEP) {
102 /* arm off, logic deep sleep */
103 mode_set |= BIT(PMU_BUS_PD_EN) |
104 BIT(PMU_DDR1IO_RET_EN) | BIT(PMU_DDR0IO_RET_EN) |
105 BIT(PMU_OSC_24M_DIS) | BIT(PMU_PMU_USE_LF) |
106 BIT(PMU_ALIVE_USE_LF) | BIT(PMU_PLL_PD_EN);
108 mode_set1 |= BIT(PMU_CLR_ALIVE) | BIT(PMU_CLR_BUS) |
109 BIT(PMU_CLR_PERI) | BIT(PMU_CLR_DMA);
112 * arm off, logic normal
113 * if pmu_clk_core_src_gate_en is not set,
114 * wakeup will be error
116 mode_set |= BIT(PMU_CLK_CORE_SRC_GATE_EN);
119 regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON, mode_set);
120 regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON1, mode_set1);
123 static void rk3288_slp_mode_set_resume(void)
125 regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON,
126 rk3288_pmu_pwr_mode_con);
128 regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
129 rk3288_sgrf_soc_con0 | SGRF_PCLK_WDT_GATE_WRITE
130 | SGRF_FAST_BOOT_EN_WRITE);
133 static int rockchip_lpmode_enter(unsigned long arg)
139 pr_err("%s: Failed to suspend\n", __func__);
144 static int rk3288_suspend_enter(suspend_state_t state)
148 rk3288_slp_mode_set(ROCKCHIP_ARM_OFF_LOGIC_NORMAL);
150 cpu_suspend(0, rockchip_lpmode_enter);
152 rk3288_slp_mode_set_resume();
159 static int rk3288_suspend_prepare(void)
161 return regulator_suspend_prepare(PM_SUSPEND_MEM);
164 static void rk3288_suspend_finish(void)
166 if (regulator_suspend_finish())
167 pr_err("%s: Suspend finish failed\n", __func__);
170 static int rk3288_suspend_init(struct device_node *np)
172 struct device_node *sram_np;
176 pmu_regmap = syscon_node_to_regmap(np);
177 if (IS_ERR(pmu_regmap)) {
178 pr_err("%s: could not find pmu regmap\n", __func__);
179 return PTR_ERR(pmu_regmap);
182 sgrf_regmap = syscon_regmap_lookup_by_compatible(
183 "rockchip,rk3288-sgrf");
184 if (IS_ERR(sgrf_regmap)) {
185 pr_err("%s: could not find sgrf regmap\n", __func__);
186 return PTR_ERR(pmu_regmap);
189 sram_np = of_find_compatible_node(NULL, NULL,
190 "rockchip,rk3288-pmu-sram");
192 pr_err("%s: could not find bootram dt node\n", __func__);
196 rk3288_bootram_base = of_iomap(sram_np, 0);
197 if (!rk3288_bootram_base) {
198 pr_err("%s: could not map bootram base\n", __func__);
202 ret = of_address_to_resource(sram_np, 0, &res);
204 pr_err("%s: could not get bootram phy addr\n", __func__);
207 rk3288_bootram_phy = res.start;
209 of_node_put(sram_np);
211 rk3288_config_bootdata();
213 /* copy resume code and data to bootsram */
214 memcpy(rk3288_bootram_base, rockchip_slp_cpu_resume,
217 regmap_write(pmu_regmap, RK3288_PMU_OSC_CNT, OSC_STABL_CNT_THRESH);
218 regmap_write(pmu_regmap, RK3288_PMU_STABL_CNT, PMU_STABL_CNT_THRESH);
223 static const struct platform_suspend_ops rk3288_suspend_ops = {
224 .enter = rk3288_suspend_enter,
225 .valid = suspend_valid_only_mem,
226 .prepare = rk3288_suspend_prepare,
227 .finish = rk3288_suspend_finish,
230 static const struct rockchip_pm_data rk3288_pm_data __initconst = {
231 .ops = &rk3288_suspend_ops,
232 .init = rk3288_suspend_init,
235 static const struct of_device_id rockchip_pmu_of_device_ids[] __initconst = {
237 .compatible = "rockchip,rk3288-pmu",
238 .data = &rk3288_pm_data,
243 void __init rockchip_suspend_init(void)
245 const struct rockchip_pm_data *pm_data;
246 const struct of_device_id *match;
247 struct device_node *np;
250 np = of_find_matching_node_and_match(NULL, rockchip_pmu_of_device_ids,
253 pr_err("Failed to find PMU node\n");
256 pm_data = (struct rockchip_pm_data *) match->data;
259 ret = pm_data->init(np);
262 pr_err("%s: matches init error %d\n", __func__, ret);
267 suspend_set_ops(pm_data->ops);