arch/arm/mach-exynos/firmware.c

   1 /*
   2  * Copyright (C) 2012 Samsung Electronics.
   3  * Kyungmin Park <kyungmin.park@samsung.com>
   4  * Tomasz Figa <t.figa@samsung.com>
   5  *
   6  * This program is free software,you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/io.h>
  13 #include <linux/init.h>
  14 #include <linux/of.h>
  15 #include <linux/of_address.h>
  16
  17 #include <asm/cacheflush.h>
  18 #include <asm/cputype.h>
  19 #include <asm/firmware.h>
  20 #include <asm/hardware/cache-l2x0.h>
  21 #include <asm/suspend.h>
  22
  23 #include "common.h"
  24 #include "smc.h"
  25
  26 #define EXYNOS_BOOT_ADDR        0x8
  27 #define EXYNOS_BOOT_FLAG        0xc
  28
  29 static void exynos_save_cp15(void)
  30 {
  31         /* Save Power control and Diagnostic registers */
  32         asm ("mrc p15, 0, %0, c15, c0, 0\n"
  33              "mrc p15, 0, %1, c15, c0, 1\n"
  34              : "=r" (cp15_save_power), "=r" (cp15_save_diag)
  35              : : "cc");
  36 }
  37
  38 static int exynos_do_idle(unsigned long mode)
  39 {
  40         switch (mode) {
  41         case FW_DO_IDLE_AFTR:
  42                 if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
  43                         exynos_save_cp15();
  44                 writel_relaxed(__pa_symbol(exynos_cpu_resume_ns),
  45                                sysram_ns_base_addr + 0x24);
  46                 writel_relaxed(EXYNOS_AFTR_MAGIC, sysram_ns_base_addr + 0x20);
  47                 if (soc_is_exynos3250()) {
  48                         flush_cache_all();
  49                         exynos_smc(SMC_CMD_SAVE, OP_TYPE_CORE,
  50                                    SMC_POWERSTATE_IDLE, 0);
  51                         exynos_smc(SMC_CMD_SHUTDOWN, OP_TYPE_CLUSTER,
  52                                    SMC_POWERSTATE_IDLE, 0);
  53                 } else
  54                         exynos_smc(SMC_CMD_CPU0AFTR, 0, 0, 0);
  55                 break;
  56         case FW_DO_IDLE_SLEEP:
  57                 exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
  58         }
  59         return 0;
  60 }
  61
  62 static int exynos_cpu_boot(int cpu)
  63 {
  64         /*
  65          * Exynos3250 doesn't need to send smc command for secondary CPU boot
  66          * because Exynos3250 removes WFE in secure mode.
  67          */
  68         if (soc_is_exynos3250())
  69                 return 0;
  70
  71         /*
  72          * The second parameter of SMC_CMD_CPU1BOOT command means CPU id.
  73          * But, Exynos4212 has only one secondary CPU so second parameter
  74          * isn't used for informing secure firmware about CPU id.
  75          */
  76         if (soc_is_exynos4212())
  77                 cpu = 0;
  78
  79         exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
  80         return 0;
  81 }
  82
  83 static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
  84 {
  85         void __iomem *boot_reg;
  86
  87         if (!sysram_ns_base_addr)
  88                 return -ENODEV;
  89
  90         boot_reg = sysram_ns_base_addr + 0x1c;
  91
  92         /*
  93          * Almost all Exynos-series of SoCs that run in secure mode don't need
  94          * additional offset for every CPU, with Exynos4412 being the only
  95          * exception.
  96          */
  97         if (soc_is_exynos4412())
  98                 boot_reg += 4 * cpu;
  99
 100         writel_relaxed(boot_addr, boot_reg);
 101         return 0;
 102 }
 103
 104 static int exynos_get_cpu_boot_addr(int cpu, unsigned long *boot_addr)
 105 {
 106         void __iomem *boot_reg;
 107
 108         if (!sysram_ns_base_addr)
 109                 return -ENODEV;
 110
 111         boot_reg = sysram_ns_base_addr + 0x1c;
 112
 113         if (soc_is_exynos4412())
 114                 boot_reg += 4 * cpu;
 115
 116         *boot_addr = readl_relaxed(boot_reg);
 117         return 0;
 118 }
 119
 120 static int exynos_cpu_suspend(unsigned long arg)
 121 {
 122         flush_cache_all();
 123         outer_flush_all();
 124
 125         exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
 126
 127         pr_info("Failed to suspend the system\n");
 128         writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
 129         return 1;
 130 }
 131
 132 static int exynos_suspend(void)
 133 {
 134         if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
 135                 exynos_save_cp15();
 136
 137         writel(EXYNOS_SLEEP_MAGIC, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
 138         writel(__pa_symbol(exynos_cpu_resume_ns),
 139                 sysram_ns_base_addr + EXYNOS_BOOT_ADDR);
 140
 141         return cpu_suspend(0, exynos_cpu_suspend);
 142 }
 143
 144 static int exynos_resume(void)
 145 {
 146         writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
 147
 148         return 0;
 149 }
 150
 151 static const struct firmware_ops exynos_firmware_ops = {
 152         .do_idle                = IS_ENABLED(CONFIG_EXYNOS_CPU_SUSPEND) ? exynos_do_idle : NULL,
 153         .set_cpu_boot_addr      = exynos_set_cpu_boot_addr,
 154         .get_cpu_boot_addr      = exynos_get_cpu_boot_addr,
 155         .cpu_boot               = exynos_cpu_boot,
 156         .suspend                = IS_ENABLED(CONFIG_PM_SLEEP) ? exynos_suspend : NULL,
 157         .resume                 = IS_ENABLED(CONFIG_EXYNOS_CPU_SUSPEND) ? exynos_resume : NULL,
 158 };
 159
 160 static void exynos_l2_write_sec(unsigned long val, unsigned reg)
 161 {
 162         static int l2cache_enabled;
 163
 164         switch (reg) {
 165         case L2X0_CTRL:
 166                 if (val & L2X0_CTRL_EN) {
 167                         /*
 168                          * Before the cache can be enabled, due to firmware
 169                          * design, SMC_CMD_L2X0INVALL must be called.
 170                          */
 171                         if (!l2cache_enabled) {
 172                                 exynos_smc(SMC_CMD_L2X0INVALL, 0, 0, 0);
 173                                 l2cache_enabled = 1;
 174                         }
 175                 } else {
 176                         l2cache_enabled = 0;
 177                 }
 178                 exynos_smc(SMC_CMD_L2X0CTRL, val, 0, 0);
 179                 break;
 180
 181         case L2X0_DEBUG_CTRL:
 182                 exynos_smc(SMC_CMD_L2X0DEBUG, val, 0, 0);
 183                 break;
 184
 185         default:
 186                 WARN_ONCE(1, "%s: ignoring write to reg 0x%x\n", __func__, reg);
 187         }
 188 }
 189
 190 static void exynos_l2_configure(const struct l2x0_regs *regs)
 191 {
 192         exynos_smc(SMC_CMD_L2X0SETUP1, regs->tag_latency, regs->data_latency,
 193                    regs->prefetch_ctrl);
 194         exynos_smc(SMC_CMD_L2X0SETUP2, regs->pwr_ctrl, regs->aux_ctrl, 0);
 195 }
 196
 197 void __init exynos_firmware_init(void)
 198 {
 199         struct device_node *nd;
 200         const __be32 *addr;
 201
 202         nd = of_find_compatible_node(NULL, NULL,
 203                                         "samsung,secure-firmware");
 204         if (!nd)
 205                 return;
 206
 207         addr = of_get_address(nd, 0, NULL, NULL);
 208         if (!addr) {
 209                 pr_err("%s: No address specified.\n", __func__);
 210                 return;
 211         }
 212
 213         pr_info("Running under secure firmware.\n");
 214
 215         register_firmware_ops(&exynos_firmware_ops);
 216
 217         /*
 218          * Exynos 4 SoCs (based on Cortex A9 and equipped with L2C-310),
 219          * running under secure firmware, require certain registers of L2
 220          * cache controller to be written in secure mode. Here .write_sec
 221          * callback is provided to perform necessary SMC calls.
 222          */
 223         if (IS_ENABLED(CONFIG_CACHE_L2X0) &&
 224             read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
 225                 outer_cache.write_sec = exynos_l2_write_sec;
 226                 outer_cache.configure = exynos_l2_configure;
 227         }
 228 }
 229
 230 #define REG_CPU_STATE_ADDR      (sysram_ns_base_addr + 0x28)
 231 #define BOOT_MODE_MASK          0x1f
 232
 233 void exynos_set_boot_flag(unsigned int cpu, unsigned int mode)
 234 {
 235         unsigned int tmp;
 236
 237         tmp = readl_relaxed(REG_CPU_STATE_ADDR + cpu * 4);
 238
 239         if (mode & BOOT_MODE_MASK)
 240                 tmp &= ~BOOT_MODE_MASK;
 241
 242         tmp |= mode;
 243         writel_relaxed(tmp, REG_CPU_STATE_ADDR + cpu * 4);
 244 }
 245
 246 void exynos_clear_boot_flag(unsigned int cpu, unsigned int mode)
 247 {
 248         unsigned int tmp;
 249
 250         tmp = readl_relaxed(REG_CPU_STATE_ADDR + cpu * 4);
 251         tmp &= ~mode;
 252         writel_relaxed(tmp, REG_CPU_STATE_ADDR + cpu * 4);
 253 }