arch/arm/mach-rockchip/pm.c

   1 /*
   2  * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
   3  * Author: Tony Xie <tony.xie@rock-chips.com>
   4  *
   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.
   8  *
   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
  12  * more details.
  13  *
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/io.h>
  18 #include <linux/kernel.h>
  19 #include <linux/of.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>
  25
  26 #include <asm/cacheflush.h>
  27 #include <asm/tlbflush.h>
  28 #include <asm/suspend.h>
  29
  30 #include "pm.h"
  31
  32 /* These enum are option of low power mode */
  33 enum {
  34         ROCKCHIP_ARM_OFF_LOGIC_NORMAL = 0,
  35         ROCKCHIP_ARM_OFF_LOGIC_DEEP = 1,
  36 };
  37
  38 struct rockchip_pm_data {
  39         const struct platform_suspend_ops *ops;
  40         int (*init)(struct device_node *np);
  41 };
  42
  43 static void __iomem *rk3288_bootram_base;
  44 static phys_addr_t rk3288_bootram_phy;
  45
  46 static struct regmap *pmu_regmap;
  47 static struct regmap *sgrf_regmap;
  48 static struct regmap *grf_regmap;
  49
  50 static u32 rk3288_pmu_pwr_mode_con;
  51 static u32 rk3288_sgrf_soc_con0;
  52 static u32 rk3288_sgrf_cpu_con0;
  53
  54 static inline u32 rk3288_l2_config(void)
  55 {
  56         u32 l2ctlr;
  57
  58         asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (l2ctlr));
  59         return l2ctlr;
  60 }
  61
  62 static void rk3288_config_bootdata(void)
  63 {
  64         rkpm_bootdata_cpusp = rk3288_bootram_phy + (SZ_4K - 8);
  65         rkpm_bootdata_cpu_code = __pa_symbol(cpu_resume);
  66
  67         rkpm_bootdata_l2ctlr_f  = 1;
  68         rkpm_bootdata_l2ctlr = rk3288_l2_config();
  69 }
  70
  71 #define GRF_UOC0_CON0                   0x320
  72 #define GRF_UOC1_CON0                   0x334
  73 #define GRF_UOC2_CON0                   0x348
  74 #define GRF_SIDDQ                       BIT(13)
  75
  76 static bool rk3288_slp_disable_osc(void)
  77 {
  78         static const u32 reg_offset[] = { GRF_UOC0_CON0, GRF_UOC1_CON0,
  79                                           GRF_UOC2_CON0 };
  80         u32 reg, i;
  81
  82         /*
  83          * if any usb phy is still on(GRF_SIDDQ==0), that means we need the
  84          * function of usb wakeup, so do not switch to 32khz, since the usb phy
  85          * clk does not connect to 32khz osc
  86          */
  87         for (i = 0; i < ARRAY_SIZE(reg_offset); i++) {
  88                 regmap_read(grf_regmap, reg_offset[i], &reg);
  89                 if (!(reg & GRF_SIDDQ))
  90                         return false;
  91         }
  92
  93         return true;
  94 }
  95
  96 static void rk3288_slp_mode_set(int level)
  97 {
  98         u32 mode_set, mode_set1;
  99         bool osc_disable = rk3288_slp_disable_osc();
 100
 101         regmap_read(sgrf_regmap, RK3288_SGRF_CPU_CON0, &rk3288_sgrf_cpu_con0);
 102         regmap_read(sgrf_regmap, RK3288_SGRF_SOC_CON0, &rk3288_sgrf_soc_con0);
 103
 104         regmap_read(pmu_regmap, RK3288_PMU_PWRMODE_CON,
 105                     &rk3288_pmu_pwr_mode_con);
 106
 107         /*
 108          * SGRF_FAST_BOOT_EN - system to boot from FAST_BOOT_ADDR
 109          * PCLK_WDT_GATE - disable WDT during suspend.
 110          */
 111         regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
 112                      SGRF_PCLK_WDT_GATE | SGRF_FAST_BOOT_EN
 113                      | SGRF_PCLK_WDT_GATE_WRITE | SGRF_FAST_BOOT_EN_WRITE);
 114
 115         /*
 116          * The dapswjdp can not auto reset before resume, that cause it may
 117          * access some illegal address during resume. Let's disable it before
 118          * suspend, and the MASKROM will enable it back.
 119          */
 120         regmap_write(sgrf_regmap, RK3288_SGRF_CPU_CON0, SGRF_DAPDEVICEEN_WRITE);
 121
 122         /* booting address of resuming system is from this register value */
 123         regmap_write(sgrf_regmap, RK3288_SGRF_FAST_BOOT_ADDR,
 124                      rk3288_bootram_phy);
 125
 126         mode_set = BIT(PMU_GLOBAL_INT_DISABLE) | BIT(PMU_L2FLUSH_EN) |
 127                    BIT(PMU_SREF0_ENTER_EN) | BIT(PMU_SREF1_ENTER_EN) |
 128                    BIT(PMU_DDR0_GATING_EN) | BIT(PMU_DDR1_GATING_EN) |
 129                    BIT(PMU_PWR_MODE_EN) | BIT(PMU_CHIP_PD_EN) |
 130                    BIT(PMU_SCU_EN);
 131
 132         mode_set1 = BIT(PMU_CLR_CORE) | BIT(PMU_CLR_CPUP);
 133
 134         if (level == ROCKCHIP_ARM_OFF_LOGIC_DEEP) {
 135                 /* arm off, logic deep sleep */
 136                 mode_set |= BIT(PMU_BUS_PD_EN) | BIT(PMU_PMU_USE_LF) |
 137                             BIT(PMU_DDR1IO_RET_EN) | BIT(PMU_DDR0IO_RET_EN) |
 138                             BIT(PMU_ALIVE_USE_LF) | BIT(PMU_PLL_PD_EN);
 139
 140                 if (osc_disable)
 141                         mode_set |= BIT(PMU_OSC_24M_DIS);
 142
 143                 mode_set1 |= BIT(PMU_CLR_ALIVE) | BIT(PMU_CLR_BUS) |
 144                              BIT(PMU_CLR_PERI) | BIT(PMU_CLR_DMA);
 145
 146                 regmap_write(pmu_regmap, RK3288_PMU_WAKEUP_CFG1,
 147                              PMU_ARMINT_WAKEUP_EN);
 148
 149                 /*
 150                  * In deep suspend we use PMU_PMU_USE_LF to let the rk3288
 151                  * switch its main clock supply to the alternative 32kHz
 152                  * source. Therefore set 30ms on a 32kHz clock for pmic
 153                  * stabilization. Similar 30ms on 24MHz for the other
 154                  * mode below.
 155                  */
 156                 regmap_write(pmu_regmap, RK3288_PMU_STABL_CNT, 32 * 30);
 157
 158                 /* only wait for stabilization, if we turned the osc off */
 159                 regmap_write(pmu_regmap, RK3288_PMU_OSC_CNT,
 160                                          osc_disable ? 32 * 30 : 0);
 161         } else {
 162                 /*
 163                  * arm off, logic normal
 164                  * if pmu_clk_core_src_gate_en is not set,
 165                  * wakeup will be error
 166                  */
 167                 mode_set |= BIT(PMU_CLK_CORE_SRC_GATE_EN);
 168
 169                 regmap_write(pmu_regmap, RK3288_PMU_WAKEUP_CFG1,
 170                              PMU_ARMINT_WAKEUP_EN | PMU_GPIOINT_WAKEUP_EN);
 171
 172                 /* 30ms on a 24MHz clock for pmic stabilization */
 173                 regmap_write(pmu_regmap, RK3288_PMU_STABL_CNT, 24000 * 30);
 174
 175                 /* oscillator is still running, so no need to wait */
 176                 regmap_write(pmu_regmap, RK3288_PMU_OSC_CNT, 0);
 177         }
 178
 179         regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON, mode_set);
 180         regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON1, mode_set1);
 181 }
 182
 183 static void rk3288_slp_mode_set_resume(void)
 184 {
 185         regmap_write(sgrf_regmap, RK3288_SGRF_CPU_CON0,
 186                      rk3288_sgrf_cpu_con0 | SGRF_DAPDEVICEEN_WRITE);
 187
 188         regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON,
 189                      rk3288_pmu_pwr_mode_con);
 190
 191         regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
 192                      rk3288_sgrf_soc_con0 | SGRF_PCLK_WDT_GATE_WRITE
 193                      | SGRF_FAST_BOOT_EN_WRITE);
 194 }
 195
 196 static int rockchip_lpmode_enter(unsigned long arg)
 197 {
 198         flush_cache_all();
 199
 200         cpu_do_idle();
 201
 202         pr_err("%s: Failed to suspend\n", __func__);
 203
 204         return 1;
 205 }
 206
 207 static int rk3288_suspend_enter(suspend_state_t state)
 208 {
 209         local_fiq_disable();
 210
 211         rk3288_slp_mode_set(ROCKCHIP_ARM_OFF_LOGIC_NORMAL);
 212
 213         cpu_suspend(0, rockchip_lpmode_enter);
 214
 215         rk3288_slp_mode_set_resume();
 216
 217         local_fiq_enable();
 218
 219         return 0;
 220 }
 221
 222 static int rk3288_suspend_prepare(void)
 223 {
 224         return regulator_suspend_prepare(PM_SUSPEND_MEM);
 225 }
 226
 227 static void rk3288_suspend_finish(void)
 228 {
 229         if (regulator_suspend_finish())
 230                 pr_err("%s: Suspend finish failed\n", __func__);
 231 }
 232
 233 static int rk3288_suspend_init(struct device_node *np)
 234 {
 235         struct device_node *sram_np;
 236         struct resource res;
 237         int ret;
 238
 239         pmu_regmap = syscon_node_to_regmap(np);
 240         if (IS_ERR(pmu_regmap)) {
 241                 pr_err("%s: could not find pmu regmap\n", __func__);
 242                 return PTR_ERR(pmu_regmap);
 243         }
 244
 245         sgrf_regmap = syscon_regmap_lookup_by_compatible(
 246                                 "rockchip,rk3288-sgrf");
 247         if (IS_ERR(sgrf_regmap)) {
 248                 pr_err("%s: could not find sgrf regmap\n", __func__);
 249                 return PTR_ERR(sgrf_regmap);
 250         }
 251
 252         grf_regmap = syscon_regmap_lookup_by_compatible(
 253                                 "rockchip,rk3288-grf");
 254         if (IS_ERR(grf_regmap)) {
 255                 pr_err("%s: could not find grf regmap\n", __func__);
 256                 return PTR_ERR(grf_regmap);
 257         }
 258
 259         sram_np = of_find_compatible_node(NULL, NULL,
 260                                           "rockchip,rk3288-pmu-sram");
 261         if (!sram_np) {
 262                 pr_err("%s: could not find bootram dt node\n", __func__);
 263                 return -ENODEV;
 264         }
 265
 266         rk3288_bootram_base = of_iomap(sram_np, 0);
 267         if (!rk3288_bootram_base) {
 268                 pr_err("%s: could not map bootram base\n", __func__);
 269                 return -ENOMEM;
 270         }
 271
 272         ret = of_address_to_resource(sram_np, 0, &res);
 273         if (ret) {
 274                 pr_err("%s: could not get bootram phy addr\n", __func__);
 275                 return ret;
 276         }
 277         rk3288_bootram_phy = res.start;
 278
 279         of_node_put(sram_np);
 280
 281         rk3288_config_bootdata();
 282
 283         /* copy resume code and data to bootsram */
 284         memcpy(rk3288_bootram_base, rockchip_slp_cpu_resume,
 285                rk3288_bootram_sz);
 286
 287         return 0;
 288 }
 289
 290 static const struct platform_suspend_ops rk3288_suspend_ops = {
 291         .enter   = rk3288_suspend_enter,
 292         .valid   = suspend_valid_only_mem,
 293         .prepare = rk3288_suspend_prepare,
 294         .finish  = rk3288_suspend_finish,
 295 };
 296
 297 static const struct rockchip_pm_data rk3288_pm_data __initconst = {
 298         .ops = &rk3288_suspend_ops,
 299         .init = rk3288_suspend_init,
 300 };
 301
 302 static const struct of_device_id rockchip_pmu_of_device_ids[] __initconst = {
 303         {
 304                 .compatible = "rockchip,rk3288-pmu",
 305                 .data = &rk3288_pm_data,
 306         },
 307         { /* sentinel */ },
 308 };
 309
 310 void __init rockchip_suspend_init(void)
 311 {
 312         const struct rockchip_pm_data *pm_data;
 313         const struct of_device_id *match;
 314         struct device_node *np;
 315         int ret;
 316
 317         np = of_find_matching_node_and_match(NULL, rockchip_pmu_of_device_ids,
 318                                              &match);
 319         if (!match) {
 320                 pr_err("Failed to find PMU node\n");
 321                 return;
 322         }
 323         pm_data = (struct rockchip_pm_data *) match->data;
 324
 325         if (pm_data->init) {
 326                 ret = pm_data->init(np);
 327
 328                 if (ret) {
 329                         pr_err("%s: matches init error %d\n", __func__, ret);
 330                         return;
 331                 }
 332         }
 333
 334         suspend_set_ops(pm_data->ops);
 335 }