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 "smc.h"
  22
  23 static int exynos_do_idle(void)
  24 {
  25         exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
  26         return 0;
  27 }
  28
  29 static int exynos_cpu_boot(int cpu)
  30 {
  31         exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
  32         return 0;
  33 }
  34
  35 static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
  36 {
  37         void __iomem *boot_reg = S5P_VA_SYSRAM_NS + 0x1c + 4*cpu;
  38
  39         __raw_writel(boot_addr, boot_reg);
  40         return 0;
  41 }
  42
  43 static const struct firmware_ops exynos_firmware_ops = {
  44         .do_idle                = exynos_do_idle,
  45         .set_cpu_boot_addr      = exynos_set_cpu_boot_addr,
  46         .cpu_boot               = exynos_cpu_boot,
  47 };
  48
  49 void __init exynos_firmware_init(void)
  50 {
  51         struct device_node *nd;
  52         const __be32 *addr;
  53
  54         nd = of_find_compatible_node(NULL, NULL,
  55                                         "samsung,secure-firmware");
  56         if (!nd)
  57                 return;
  58
  59         addr = of_get_address(nd, 0, NULL, NULL);
  60         if (!addr) {
  61                 pr_err("%s: No address specified.\n", __func__);
  62                 return;
  63         }
  64
  65         pr_info("Running under secure firmware.\n");
  66
  67         register_firmware_ops(&exynos_firmware_ops);
  68 }