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Commit bca28f8f authored by Tomasz Figa's avatar Tomasz Figa Committed by Kukjin Kim
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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: default avatarKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: default avatarTomasz Figa <t.figa@samsung.com>
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
parent a4a18d2b

Documentation/devicetree/bindings/arm/samsung-boards.txt

+10 −0
Original line number Diff line number Diff line
@@ -6,3 +6,13 @@ Required root node properties: 
    - compatible = should be one or more of the following.

        (a) "samsung,smdkv310" - for Samsung's SMDKV310 eval board.

        (b) "samsung,exynos4210"  - for boards based on Exynos4210 SoC.



Optional:

    - firmware node, specifying presence and type of secure firmware:

        - compatible: only "samsung,secure-firmware" is currently supported

        - reg: address of non-secure SYSRAM used for communication with firmware



	firmware@0203F000 {

		compatible = "samsung,secure-firmware";

		reg = <0x0203F000 0x1000>;

	};

arch/arm/mach-exynos/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ obj-$(CONFIG_SMP) += platsmp.o headsmp.o 
obj-$(CONFIG_HOTPLUG_CPU)	+= hotplug.o



obj-$(CONFIG_ARCH_EXYNOS)	+= exynos-smc.o

obj-$(CONFIG_ARCH_EXYNOS)	+= firmware.o



plus_sec := $(call as-instr,.arch_extension sec,+sec)

AFLAGS_exynos-smc.o		:=-Wa,-march=armv7-a$(plus_sec)

arch/arm/mach-exynos/common.h

+2 −0
Original line number Diff line number Diff line
@@ -30,6 +30,8 @@ void exynos_init_late(void); 
void exynos4_clk_init(struct device_node *np);

void exynos4_clk_register_fixed_ext(unsigned long, unsigned long);



void exynos_firmware_init(void);



#ifdef CONFIG_PM_GENERIC_DOMAINS

int exynos_pm_late_initcall(void);

#else

arch/arm/mach-exynos/firmware.c

0 → 100644
+70 −0
Original line number Diff line number Diff line 
/*

 * 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);

}

arch/arm/mach-exynos/mach-exynos4-dt.c

+1 −0
Original line number Diff line number Diff line
@@ -57,6 +57,7 @@ DT_MACHINE_START(EXYNOS4210_DT, "Samsung Exynos4 (Flattened Device Tree)") 
	.smp		= smp_ops(exynos_smp_ops),

	.init_irq	= exynos4_init_irq,

	.map_io		= exynos4_dt_map_io,

	.init_early	= exynos_firmware_init,

	.init_machine	= exynos4_dt_machine_init,

	.init_late	= exynos_init_late,

	.init_time	= exynos_init_time,