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/firmware.h>
  18
  19 #include <mach/map.h>
  20
  21 #include "common.h"
  22 #include "smc.h"
  23
  24 static int exynos_do_idle(void)
  25 {
  26         exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
  27         return 0;
  28 }
  29
  30 static int exynos_cpu_boot(int cpu)
  31 {
  32         /*
  33          * Exynos3250 doesn't need to send smc command for secondary CPU boot
  34          * because Exynos3250 removes WFE in secure mode.
  35          */
  36         if (soc_is_exynos3250())
  37                 return 0;
  38
  39         /*
  40          * The second parameter of SMC_CMD_CPU1BOOT command means CPU id.
  41          * But, Exynos4212 has only one secondary CPU so second parameter
  42          * isn't used for informing secure firmware about CPU id.
  43          */
  44         if (soc_is_exynos4212())
  45                 cpu = 0;
  46
  47         exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
  48         return 0;
  49 }
  50
  51 static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
  52 {
  53         void __iomem *boot_reg;
  54
  55         if (!sysram_ns_base_addr)
  56                 return -ENODEV;
  57
  58         boot_reg = sysram_ns_base_addr + 0x1c;
  59
  60         /*
  61          * Almost all Exynos-series of SoCs that run in secure mode don't need
  62          * additional offset for every CPU, with Exynos4412 being the only
  63          * exception.
  64          */
  65         if (soc_is_exynos4412())
  66                 boot_reg += 4 * cpu;
  67
  68         __raw_writel(boot_addr, boot_reg);
  69         return 0;
  70 }
  71
  72 static const struct firmware_ops exynos_firmware_ops = {
  73         .do_idle                = exynos_do_idle,
  74         .set_cpu_boot_addr      = exynos_set_cpu_boot_addr,
  75         .cpu_boot               = exynos_cpu_boot,
  76 };
  77
  78 void __init exynos_firmware_init(void)
  79 {
  80         struct device_node *nd;
  81         const __be32 *addr;
  82
  83         nd = of_find_compatible_node(NULL, NULL,
  84                                         "samsung,secure-firmware");
  85         if (!nd)
  86                 return;
  87
  88         addr = of_get_address(nd, 0, NULL, NULL);
  89         if (!addr) {
  90                 pr_err("%s: No address specified.\n", __func__);
  91                 return;
  92         }
  93
  94         pr_info("Running under secure firmware.\n");
  95
  96         register_firmware_ops(&exynos_firmware_ops);
  97 }