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 *grf_regmap;
  48 static struct regmap *sgrf_regmap;
  49
  50 static u32 rk3288_pmu_pwr_mode_con;
  51 static u32 rk3288_grf_soc_con0;
  52 static u32 rk3288_sgrf_soc_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 = virt_to_phys(cpu_resume);
  66
  67         rkpm_bootdata_l2ctlr_f  = 1;
  68         rkpm_bootdata_l2ctlr = rk3288_l2_config();
  69 }
  70
  71 static void rk3288_slp_mode_set(int level)
  72 {
  73         u32 mode_set, mode_set1;
  74
  75         regmap_read(grf_regmap, RK3288_GRF_SOC_CON0, &rk3288_grf_soc_con0);
  76
  77         regmap_read(sgrf_regmap, RK3288_SGRF_SOC_CON0, &rk3288_sgrf_soc_con0);
  78
  79         regmap_read(pmu_regmap, RK3288_PMU_PWRMODE_CON,
  80                     &rk3288_pmu_pwr_mode_con);
  81
  82         /*
  83          * We need set this bit GRF_FORCE_JTAG here, for the debug module,
  84          * otherwise, it may become inaccessible after resume.
  85          * This creates a potential security issue, as the sdmmc pins may
  86          * accept jtag data for a short time during resume if no card is
  87          * inserted.
  88          * But this is of course also true for the regular boot, before we
  89          * turn of the jtag/sdmmc autodetect.
  90          */
  91         regmap_write(grf_regmap, RK3288_GRF_SOC_CON0, GRF_FORCE_JTAG |
  92                      GRF_FORCE_JTAG_WRITE);
  93
  94         /*
  95          * SGRF_FAST_BOOT_EN - system to boot from FAST_BOOT_ADDR
  96          * PCLK_WDT_GATE - disable WDT during suspend.
  97          */
  98         regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
  99                      SGRF_PCLK_WDT_GATE | SGRF_FAST_BOOT_EN
 100                      | SGRF_PCLK_WDT_GATE_WRITE | SGRF_FAST_BOOT_EN_WRITE);
 101
 102         /*
 103          * The dapswjdp can not auto reset before resume, that cause it may
 104          * access some illegal address during resume. Let's disable it before
 105          * suspend, and the MASKROM will enable it back.
 106          */
 107         regmap_write(sgrf_regmap, RK3288_SGRF_CPU_CON0, SGRF_DAPDEVICEEN_WRITE);
 108
 109         /* booting address of resuming system is from this register value */
 110         regmap_write(sgrf_regmap, RK3288_SGRF_FAST_BOOT_ADDR,
 111                      rk3288_bootram_phy);
 112
 113         regmap_write(pmu_regmap, RK3288_PMU_WAKEUP_CFG1,
 114                      PMU_ARMINT_WAKEUP_EN);
 115
 116         mode_set = BIT(PMU_GLOBAL_INT_DISABLE) | BIT(PMU_L2FLUSH_EN) |
 117                    BIT(PMU_SREF0_ENTER_EN) | BIT(PMU_SREF1_ENTER_EN) |
 118                    BIT(PMU_DDR0_GATING_EN) | BIT(PMU_DDR1_GATING_EN) |
 119                    BIT(PMU_PWR_MODE_EN) | BIT(PMU_CHIP_PD_EN) |
 120                    BIT(PMU_SCU_EN);
 121
 122         mode_set1 = BIT(PMU_CLR_CORE) | BIT(PMU_CLR_CPUP);
 123
 124         if (level == ROCKCHIP_ARM_OFF_LOGIC_DEEP) {
 125                 /* arm off, logic deep sleep */
 126                 mode_set |= BIT(PMU_BUS_PD_EN) |
 127                             BIT(PMU_DDR1IO_RET_EN) | BIT(PMU_DDR0IO_RET_EN) |
 128                             BIT(PMU_OSC_24M_DIS) | BIT(PMU_PMU_USE_LF) |
 129                             BIT(PMU_ALIVE_USE_LF) | BIT(PMU_PLL_PD_EN);
 130
 131                 mode_set1 |= BIT(PMU_CLR_ALIVE) | BIT(PMU_CLR_BUS) |
 132                              BIT(PMU_CLR_PERI) | BIT(PMU_CLR_DMA);
 133         } else {
 134                 /*
 135                  * arm off, logic normal
 136                  * if pmu_clk_core_src_gate_en is not set,
 137                  * wakeup will be error
 138                  */
 139                 mode_set |= BIT(PMU_CLK_CORE_SRC_GATE_EN);
 140         }
 141
 142         regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON, mode_set);
 143         regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON1, mode_set1);
 144 }
 145
 146 static void rk3288_slp_mode_set_resume(void)
 147 {
 148         regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON,
 149                      rk3288_pmu_pwr_mode_con);
 150
 151         regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
 152                      rk3288_sgrf_soc_con0 | SGRF_PCLK_WDT_GATE_WRITE
 153                      | SGRF_FAST_BOOT_EN_WRITE);
 154
 155         regmap_write(grf_regmap, RK3288_GRF_SOC_CON0, rk3288_grf_soc_con0 |
 156                      GRF_FORCE_JTAG_WRITE);
 157 }
 158
 159 static int rockchip_lpmode_enter(unsigned long arg)
 160 {
 161         flush_cache_all();
 162
 163         cpu_do_idle();
 164
 165         pr_err("%s: Failed to suspend\n", __func__);
 166
 167         return 1;
 168 }
 169
 170 static int rk3288_suspend_enter(suspend_state_t state)
 171 {
 172         local_fiq_disable();
 173
 174         rk3288_slp_mode_set(ROCKCHIP_ARM_OFF_LOGIC_NORMAL);
 175
 176         cpu_suspend(0, rockchip_lpmode_enter);
 177
 178         rk3288_slp_mode_set_resume();
 179
 180         local_fiq_enable();
 181
 182         return 0;
 183 }
 184
 185 static int rk3288_suspend_prepare(void)
 186 {
 187         return regulator_suspend_prepare(PM_SUSPEND_MEM);
 188 }
 189
 190 static void rk3288_suspend_finish(void)
 191 {
 192         if (regulator_suspend_finish())
 193                 pr_err("%s: Suspend finish failed\n", __func__);
 194 }
 195
 196 static int rk3288_suspend_init(struct device_node *np)
 197 {
 198         struct device_node *sram_np;
 199         struct resource res;
 200         int ret;
 201
 202         pmu_regmap = syscon_node_to_regmap(np);
 203         if (IS_ERR(pmu_regmap)) {
 204                 pr_err("%s: could not find pmu regmap\n", __func__);
 205                 return PTR_ERR(pmu_regmap);
 206         }
 207
 208         sgrf_regmap = syscon_regmap_lookup_by_compatible(
 209                                 "rockchip,rk3288-sgrf");
 210         if (IS_ERR(sgrf_regmap)) {
 211                 pr_err("%s: could not find sgrf regmap\n", __func__);
 212                 return PTR_ERR(pmu_regmap);
 213         }
 214
 215         grf_regmap = syscon_regmap_lookup_by_compatible(
 216                                 "rockchip,rk3288-grf");
 217         if (IS_ERR(grf_regmap)) {
 218                 pr_err("%s: could not find grf regmap\n", __func__);
 219                 return PTR_ERR(pmu_regmap);
 220         }
 221
 222         sram_np = of_find_compatible_node(NULL, NULL,
 223                                           "rockchip,rk3288-pmu-sram");
 224         if (!sram_np) {
 225                 pr_err("%s: could not find bootram dt node\n", __func__);
 226                 return -ENODEV;
 227         }
 228
 229         rk3288_bootram_base = of_iomap(sram_np, 0);
 230         if (!rk3288_bootram_base) {
 231                 pr_err("%s: could not map bootram base\n", __func__);
 232                 return -ENOMEM;
 233         }
 234
 235         ret = of_address_to_resource(sram_np, 0, &res);
 236         if (ret) {
 237                 pr_err("%s: could not get bootram phy addr\n", __func__);
 238                 return ret;
 239         }
 240         rk3288_bootram_phy = res.start;
 241
 242         of_node_put(sram_np);
 243
 244         rk3288_config_bootdata();
 245
 246         /* copy resume code and data to bootsram */
 247         memcpy(rk3288_bootram_base, rockchip_slp_cpu_resume,
 248                rk3288_bootram_sz);
 249
 250         regmap_write(pmu_regmap, RK3288_PMU_OSC_CNT, OSC_STABL_CNT_THRESH);
 251         regmap_write(pmu_regmap, RK3288_PMU_STABL_CNT, PMU_STABL_CNT_THRESH);
 252
 253         return 0;
 254 }
 255
 256 static const struct platform_suspend_ops rk3288_suspend_ops = {
 257         .enter   = rk3288_suspend_enter,
 258         .valid   = suspend_valid_only_mem,
 259         .prepare = rk3288_suspend_prepare,
 260         .finish  = rk3288_suspend_finish,
 261 };
 262
 263 static const struct rockchip_pm_data rk3288_pm_data __initconst = {
 264         .ops = &rk3288_suspend_ops,
 265         .init = rk3288_suspend_init,
 266 };
 267
 268 static const struct of_device_id rockchip_pmu_of_device_ids[] __initconst = {
 269         {
 270                 .compatible = "rockchip,rk3288-pmu",
 271                 .data = &rk3288_pm_data,
 272         },
 273         { /* sentinel */ },
 274 };
 275
 276 void __init rockchip_suspend_init(void)
 277 {
 278         const struct rockchip_pm_data *pm_data;
 279         const struct of_device_id *match;
 280         struct device_node *np;
 281         int ret;
 282
 283         np = of_find_matching_node_and_match(NULL, rockchip_pmu_of_device_ids,
 284                                              &match);
 285         if (!match) {
 286                 pr_err("Failed to find PMU node\n");
 287                 return;
 288         }
 289         pm_data = (struct rockchip_pm_data *) match->data;
 290
 291         if (pm_data->init) {
 292                 ret = pm_data->init(np);
 293
 294                 if (ret) {
 295                         pr_err("%s: matches init error %d\n", __func__, ret);
 296                         return;
 297                 }
 298         }
 299
 300         suspend_set_ops(pm_data->ops);
 301 }