arch/arm/mach-rockchip/pm.c

   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], &reg);
  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 }