1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd 4 * Author: Tony Xie <tony.xie@rock-chips.com> 5 */ 6 7 #include <linux/init.h> 8 #include <linux/io.h> 9 #include <linux/kernel.h> 10 #include <linux/of.h> 11 #include <linux/of_address.h> 12 #include <linux/regmap.h> 13 #include <linux/suspend.h> 14 #include <linux/mfd/syscon.h> 15 #include <linux/regulator/machine.h> 16 17 #include <asm/cacheflush.h> 18 #include <asm/tlbflush.h> 19 #include <asm/suspend.h> 20 21 #include "pm.h" 22 23 /* These enum are option of low power mode */ 24 enum { 25 ROCKCHIP_ARM_OFF_LOGIC_NORMAL = 0, 26 ROCKCHIP_ARM_OFF_LOGIC_DEEP = 1, 27 }; 28 29 struct rockchip_pm_data { 30 const struct platform_suspend_ops *ops; 31 int (*init)(struct device_node *np); 32 }; 33 34 static void __iomem *rk3288_bootram_base; 35 static phys_addr_t rk3288_bootram_phy; 36 37 static struct regmap *pmu_regmap; 38 static struct regmap *sgrf_regmap; 39 static struct regmap *grf_regmap; 40 41 static u32 rk3288_pmu_pwr_mode_con; 42 static u32 rk3288_sgrf_soc_con0; 43 static u32 rk3288_sgrf_cpu_con0; 44 45 static inline u32 rk3288_l2_config(void) 46 { 47 u32 l2ctlr; 48 49 asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (l2ctlr)); 50 return l2ctlr; 51 } 52 53 static void __init rk3288_config_bootdata(void) 54 { 55 rkpm_bootdata_cpusp = rk3288_bootram_phy + (SZ_4K - 8); 56 rkpm_bootdata_cpu_code = __pa_symbol(cpu_resume); 57 58 rkpm_bootdata_l2ctlr_f = 1; 59 rkpm_bootdata_l2ctlr = rk3288_l2_config(); 60 } 61 62 #define GRF_UOC0_CON0 0x320 63 #define GRF_UOC1_CON0 0x334 64 #define GRF_UOC2_CON0 0x348 65 #define GRF_SIDDQ BIT(13) 66 67 static bool rk3288_slp_disable_osc(void) 68 { 69 static const u32 reg_offset[] = { GRF_UOC0_CON0, GRF_UOC1_CON0, 70 GRF_UOC2_CON0 }; 71 u32 reg, i; 72 73 /* 74 * if any usb phy is still on(GRF_SIDDQ==0), that means we need the 75 * function of usb wakeup, so do not switch to 32khz, since the usb phy 76 * clk does not connect to 32khz osc 77 */ 78 for (i = 0; i < ARRAY_SIZE(reg_offset); i++) { 79 regmap_read(grf_regmap, reg_offset[i], ®); 80 if (!(reg & GRF_SIDDQ)) 81 return false; 82 } 83 84 return true; 85 } 86 87 static void rk3288_slp_mode_set(int level) 88 { 89 u32 mode_set, mode_set1; 90 bool osc_disable = rk3288_slp_disable_osc(); 91 92 regmap_read(sgrf_regmap, RK3288_SGRF_CPU_CON0, &rk3288_sgrf_cpu_con0); 93 regmap_read(sgrf_regmap, RK3288_SGRF_SOC_CON0, &rk3288_sgrf_soc_con0); 94 95 regmap_read(pmu_regmap, RK3288_PMU_PWRMODE_CON, 96 &rk3288_pmu_pwr_mode_con); 97 98 /* 99 * SGRF_FAST_BOOT_EN - system to boot from FAST_BOOT_ADDR 100 * PCLK_WDT_GATE - disable WDT during suspend. 101 */ 102 regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0, 103 SGRF_PCLK_WDT_GATE | SGRF_FAST_BOOT_EN 104 | SGRF_PCLK_WDT_GATE_WRITE | SGRF_FAST_BOOT_EN_WRITE); 105 106 /* 107 * The dapswjdp can not auto reset before resume, that cause it may 108 * access some illegal address during resume. Let's disable it before 109 * suspend, and the MASKROM will enable it back. 110 */ 111 regmap_write(sgrf_regmap, RK3288_SGRF_CPU_CON0, SGRF_DAPDEVICEEN_WRITE); 112 113 /* booting address of resuming system is from this register value */ 114 regmap_write(sgrf_regmap, RK3288_SGRF_FAST_BOOT_ADDR, 115 rk3288_bootram_phy); 116 117 mode_set = BIT(PMU_GLOBAL_INT_DISABLE) | BIT(PMU_L2FLUSH_EN) | 118 BIT(PMU_SREF0_ENTER_EN) | BIT(PMU_SREF1_ENTER_EN) | 119 BIT(PMU_DDR0_GATING_EN) | BIT(PMU_DDR1_GATING_EN) | 120 BIT(PMU_PWR_MODE_EN) | BIT(PMU_CHIP_PD_EN) | 121 BIT(PMU_SCU_EN); 122 123 mode_set1 = BIT(PMU_CLR_CORE) | BIT(PMU_CLR_CPUP); 124 125 if (level == ROCKCHIP_ARM_OFF_LOGIC_DEEP) { 126 /* arm off, logic deep sleep */ 127 mode_set |= BIT(PMU_BUS_PD_EN) | BIT(PMU_PMU_USE_LF) | 128 BIT(PMU_DDR1IO_RET_EN) | BIT(PMU_DDR0IO_RET_EN) | 129 BIT(PMU_ALIVE_USE_LF) | BIT(PMU_PLL_PD_EN); 130 131 if (osc_disable) 132 mode_set |= BIT(PMU_OSC_24M_DIS); 133 134 mode_set1 |= BIT(PMU_CLR_ALIVE) | BIT(PMU_CLR_BUS) | 135 BIT(PMU_CLR_PERI) | BIT(PMU_CLR_DMA); 136 137 regmap_write(pmu_regmap, RK3288_PMU_WAKEUP_CFG1, 138 PMU_ARMINT_WAKEUP_EN); 139 140 /* 141 * In deep suspend we use PMU_PMU_USE_LF to let the rk3288 142 * switch its main clock supply to the alternative 32kHz 143 * source. Therefore set 30ms on a 32kHz clock for pmic 144 * stabilization. Similar 30ms on 24MHz for the other 145 * mode below. 146 */ 147 regmap_write(pmu_regmap, RK3288_PMU_STABL_CNT, 32 * 30); 148 149 /* only wait for stabilization, if we turned the osc off */ 150 regmap_write(pmu_regmap, RK3288_PMU_OSC_CNT, 151 osc_disable ? 32 * 30 : 0); 152 } else { 153 /* 154 * arm off, logic normal 155 * if pmu_clk_core_src_gate_en is not set, 156 * wakeup will be error 157 */ 158 mode_set |= BIT(PMU_CLK_CORE_SRC_GATE_EN); 159 160 regmap_write(pmu_regmap, RK3288_PMU_WAKEUP_CFG1, 161 PMU_ARMINT_WAKEUP_EN | PMU_GPIOINT_WAKEUP_EN); 162 163 /* 30ms on a 24MHz clock for pmic stabilization */ 164 regmap_write(pmu_regmap, RK3288_PMU_STABL_CNT, 24000 * 30); 165 166 /* oscillator is still running, so no need to wait */ 167 regmap_write(pmu_regmap, RK3288_PMU_OSC_CNT, 0); 168 } 169 170 regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON, mode_set); 171 regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON1, mode_set1); 172 } 173 174 static void rk3288_slp_mode_set_resume(void) 175 { 176 regmap_write(sgrf_regmap, RK3288_SGRF_CPU_CON0, 177 rk3288_sgrf_cpu_con0 | SGRF_DAPDEVICEEN_WRITE); 178 179 regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON, 180 rk3288_pmu_pwr_mode_con); 181 182 regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0, 183 rk3288_sgrf_soc_con0 | SGRF_PCLK_WDT_GATE_WRITE 184 | SGRF_FAST_BOOT_EN_WRITE); 185 } 186 187 static int rockchip_lpmode_enter(unsigned long arg) 188 { 189 flush_cache_all(); 190 191 cpu_do_idle(); 192 193 pr_err("%s: Failed to suspend\n", __func__); 194 195 return 1; 196 } 197 198 static int rk3288_suspend_enter(suspend_state_t state) 199 { 200 local_fiq_disable(); 201 202 rk3288_slp_mode_set(ROCKCHIP_ARM_OFF_LOGIC_NORMAL); 203 204 cpu_suspend(0, rockchip_lpmode_enter); 205 206 rk3288_slp_mode_set_resume(); 207 208 local_fiq_enable(); 209 210 return 0; 211 } 212 213 static int rk3288_suspend_prepare(void) 214 { 215 return regulator_suspend_prepare(PM_SUSPEND_MEM); 216 } 217 218 static void rk3288_suspend_finish(void) 219 { 220 if (regulator_suspend_finish()) 221 pr_err("%s: Suspend finish failed\n", __func__); 222 } 223 224 static int __init rk3288_suspend_init(struct device_node *np) 225 { 226 struct device_node *sram_np; 227 struct resource res; 228 int ret; 229 230 pmu_regmap = syscon_node_to_regmap(np); 231 if (IS_ERR(pmu_regmap)) { 232 pr_err("%s: could not find pmu regmap\n", __func__); 233 return PTR_ERR(pmu_regmap); 234 } 235 236 sgrf_regmap = syscon_regmap_lookup_by_compatible( 237 "rockchip,rk3288-sgrf"); 238 if (IS_ERR(sgrf_regmap)) { 239 pr_err("%s: could not find sgrf regmap\n", __func__); 240 return PTR_ERR(sgrf_regmap); 241 } 242 243 grf_regmap = syscon_regmap_lookup_by_compatible( 244 "rockchip,rk3288-grf"); 245 if (IS_ERR(grf_regmap)) { 246 pr_err("%s: could not find grf regmap\n", __func__); 247 return PTR_ERR(grf_regmap); 248 } 249 250 sram_np = of_find_compatible_node(NULL, NULL, 251 "rockchip,rk3288-pmu-sram"); 252 if (!sram_np) { 253 pr_err("%s: could not find bootram dt node\n", __func__); 254 return -ENODEV; 255 } 256 257 rk3288_bootram_base = of_iomap(sram_np, 0); 258 if (!rk3288_bootram_base) { 259 pr_err("%s: could not map bootram base\n", __func__); 260 of_node_put(sram_np); 261 return -ENOMEM; 262 } 263 264 ret = of_address_to_resource(sram_np, 0, &res); 265 if (ret) { 266 pr_err("%s: could not get bootram phy addr\n", __func__); 267 of_node_put(sram_np); 268 return ret; 269 } 270 rk3288_bootram_phy = res.start; 271 272 of_node_put(sram_np); 273 274 rk3288_config_bootdata(); 275 276 /* copy resume code and data to bootsram */ 277 memcpy(rk3288_bootram_base, rockchip_slp_cpu_resume, 278 rk3288_bootram_sz); 279 280 return 0; 281 } 282 283 static const struct platform_suspend_ops rk3288_suspend_ops = { 284 .enter = rk3288_suspend_enter, 285 .valid = suspend_valid_only_mem, 286 .prepare = rk3288_suspend_prepare, 287 .finish = rk3288_suspend_finish, 288 }; 289 290 static const struct rockchip_pm_data rk3288_pm_data __initconst = { 291 .ops = &rk3288_suspend_ops, 292 .init = rk3288_suspend_init, 293 }; 294 295 static const struct of_device_id rockchip_pmu_of_device_ids[] __initconst = { 296 { 297 .compatible = "rockchip,rk3288-pmu", 298 .data = &rk3288_pm_data, 299 }, 300 { /* sentinel */ }, 301 }; 302 303 void __init rockchip_suspend_init(void) 304 { 305 const struct rockchip_pm_data *pm_data; 306 const struct of_device_id *match; 307 struct device_node *np; 308 int ret; 309 310 np = of_find_matching_node_and_match(NULL, rockchip_pmu_of_device_ids, 311 &match); 312 if (!match) { 313 pr_err("Failed to find PMU node\n"); 314 return; 315 } 316 pm_data = (struct rockchip_pm_data *) match->data; 317 318 if (pm_data->init) { 319 ret = pm_data->init(np); 320 321 if (ret) { 322 pr_err("%s: matches init error %d\n", __func__, ret); 323 return; 324 } 325 } 326 327 suspend_set_ops(pm_data->ops); 328 } 329