linux/arch/arm/mach-exynos/firmware.c
Tomasz Figa bca28f8f6b ARM: EXYNOS: Add support for Exynos secure firmware
Some Exynos-based boards contain secure firmware and must use firmware
operations to set up some hardware.

This patch adds firmware operations for Exynos secure firmware and a way
for board code and device tree to specify that they must be used.

Example of use:

In board code:

  ...MACHINE_START(...)
          /* ... */
          .init_early   = exynos_firmware_init,
          /* ... */
  MACHINE_END

In device tree:

  / {
          /* ... */

          firmware@0203F000 {
                  compatible = "samsung,secure-firmware";
                  reg = <0x0203F000 0x1000>;
          };

          /* ... */
  };

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-04-09 01:52:30 +09:00

71 lines
1.5 KiB
C

/*
* Copyright (C) 2012 Samsung Electronics.
* Kyungmin Park <kyungmin.park@samsung.com>
* Tomasz Figa <t.figa@samsung.com>
*
* This program is free software,you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <asm/firmware.h>
#include <mach/map.h>
#include "smc.h"
static int exynos_do_idle(void)
{
exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
return 0;
}
static int exynos_cpu_boot(int cpu)
{
exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
return 0;
}
static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
{
void __iomem *boot_reg = S5P_VA_SYSRAM_NS + 0x1c + 4*cpu;
__raw_writel(boot_addr, boot_reg);
return 0;
}
static const struct firmware_ops exynos_firmware_ops = {
.do_idle = exynos_do_idle,
.set_cpu_boot_addr = exynos_set_cpu_boot_addr,
.cpu_boot = exynos_cpu_boot,
};
void __init exynos_firmware_init(void)
{
if (of_have_populated_dt()) {
struct device_node *nd;
const __be32 *addr;
nd = of_find_compatible_node(NULL, NULL,
"samsung,secure-firmware");
if (!nd)
return;
addr = of_get_address(nd, 0, NULL, NULL);
if (!addr) {
pr_err("%s: No address specified.\n", __func__);
return;
}
}
pr_info("Running under secure firmware.\n");
register_firmware_ops(&exynos_firmware_ops);
}