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 <plat/cpu.h>
  22
  23 #include "smc.h"
  24
  25 static int exynos_do_idle(void)
  26 {
  27         exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
  28         return 0;
  29 }
  30
  31 static int exynos_cpu_boot(int cpu)
  32 {
  33         /*
  34          * The second parameter of SMC_CMD_CPU1BOOT command means CPU id.
  35          * But, Exynos4212 has only one secondary CPU so second parameter
  36          * isn't used for informing secure firmware about CPU id.
  37          */
  38         if (soc_is_exynos4212())
  39                 cpu = 0;
  40
  41         exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
  42         return 0;
  43 }
  44
  45 static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
  46 {
  47         void __iomem *boot_reg = S5P_VA_SYSRAM_NS + 0x1c;
  48
  49         if (!soc_is_exynos4212())
  50                 boot_reg += 4*cpu;
  51
  52         __raw_writel(boot_addr, boot_reg);
  53         return 0;
  54 }
  55
  56 static const struct firmware_ops exynos_firmware_ops = {
  57         .do_idle                = exynos_do_idle,
  58         .set_cpu_boot_addr      = exynos_set_cpu_boot_addr,
  59         .cpu_boot               = exynos_cpu_boot,
  60 };
  61
  62 void __init exynos_firmware_init(void)
  63 {
  64         struct device_node *nd;
  65         const __be32 *addr;
  66
  67         nd = of_find_compatible_node(NULL, NULL,
  68                                         "samsung,secure-firmware");
  69         if (!nd)
  70                 return;
  71
  72         addr = of_get_address(nd, 0, NULL, NULL);
  73         if (!addr) {
  74                 pr_err("%s: No address specified.\n", __func__);
  75                 return;
  76         }
  77
  78         pr_info("Running under secure firmware.\n");
  79
  80         register_firmware_ops(&exynos_firmware_ops);
  81 }