Commit ad14ecee authored by Alexandre Courbot's avatar Alexandre Courbot Committed by Stephen Warren
Browse files

ARM: tegra: split setting of CPU reset handler 



Not all Tegra devices can set the CPU reset handler in the same way.
In particular, devices using a TrustZone secure monitor cannot set it
up directly and need to ask the firmware to do it.

This patch separates the act of setting the reset handler from its
preparation, so the former can be implemented in a different way.

Signed-off-by: default avatarAlexandre Courbot <acourbot@nvidia.com>
Reviewed-by: default avatarTomasz Figa <t.figa@samsung.com>
Reviewed-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
parent 1a5de3ae

arch/arm/mach-tegra/reset.c

+17 −10
Original line number Diff line number Diff line
@@ -33,26 +33,18 @@ 


static bool is_enabled;



static void __init tegra_cpu_reset_handler_enable(void)

static void __init tegra_cpu_reset_handler_set(const u32 reset_address)

{

	void __iomem *iram_base = IO_ADDRESS(TEGRA_IRAM_RESET_BASE);

	void __iomem *evp_cpu_reset =

		IO_ADDRESS(TEGRA_EXCEPTION_VECTORS_BASE + 0x100);

	void __iomem *sb_ctrl = IO_ADDRESS(TEGRA_SB_BASE);

	u32 reg;



	BUG_ON(is_enabled);

	BUG_ON(tegra_cpu_reset_handler_size > TEGRA_IRAM_RESET_HANDLER_SIZE);



	memcpy(iram_base, (void *)__tegra_cpu_reset_handler_start,

			tegra_cpu_reset_handler_size);



	/*

	 * NOTE: This must be the one and only write to the EVP CPU reset

	 *       vector in the entire system.

	 */

	writel(TEGRA_IRAM_RESET_BASE + tegra_cpu_reset_handler_offset,

			evp_cpu_reset);

	writel(reset_address, evp_cpu_reset);

	wmb();

	reg = readl(evp_cpu_reset);
@@ -66,6 +58,21 @@ static void __init tegra_cpu_reset_handler_enable(void) 
		writel(reg, sb_ctrl);

		wmb();

	}

}



static void __init tegra_cpu_reset_handler_enable(void)

{

	void __iomem *iram_base = IO_ADDRESS(TEGRA_IRAM_RESET_BASE);

	const u32 reset_address = TEGRA_IRAM_RESET_BASE +

						tegra_cpu_reset_handler_offset;



	BUG_ON(is_enabled);

	BUG_ON(tegra_cpu_reset_handler_size > TEGRA_IRAM_RESET_HANDLER_SIZE);



	memcpy(iram_base, (void *)__tegra_cpu_reset_handler_start,

			tegra_cpu_reset_handler_size);



	tegra_cpu_reset_handler_set(reset_address);



	is_enabled = true;

}

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