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/*
* arch/arm/mach-tegra/reset.c
*
* Copyright (C) 2011,2012 NVIDIA Corporation.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/bitops.h>
#include <linux/cpumask.h>
#include <linux/init.h>
#include <linux/io.h>
#include <soc/tegra/fuse.h>
#include <asm/cacheflush.h>
#include <asm/firmware.h>
#include <asm/hardware/cache-l2x0.h>
#include "iomap.h"
#include "irammap.h"
#include "reset.h"
#include "sleep.h"
#define TEGRA_IRAM_RESET_BASE (TEGRA_IRAM_BASE + \
TEGRA_IRAM_RESET_HANDLER_OFFSET)
static bool is_enabled;
static void __init tegra_cpu_reset_handler_set(const u32 reset_address)
{
void __iomem *evp_cpu_reset =
IO_ADDRESS(TEGRA_EXCEPTION_VECTORS_BASE + 0x100);
void __iomem *sb_ctrl = IO_ADDRESS(TEGRA_SB_BASE);
u32 reg;
/*
* NOTE: This must be the one and only write to the EVP CPU reset
* vector in the entire system.
*/
writel(reset_address, evp_cpu_reset);
wmb();
reg = readl(evp_cpu_reset);
/*
* Prevent further modifications to the physical reset vector.
* NOTE: Has no effect on chips prior to Tegra30.
*/
if (tegra_get_chip_id() != TEGRA20) {
reg = readl(sb_ctrl);
reg |= 2;
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;
int err;
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);
err = call_firmware_op(set_cpu_boot_addr, 0, reset_address);
switch (err) {
case -ENOSYS:
tegra_cpu_reset_handler_set(reset_address);
/* pass-through */
case 0:
is_enabled = true;
break;
default:
pr_crit("Cannot set CPU reset handler: %d\n", err);
BUG();
}
}
void __init tegra_cpu_reset_handler_init(void)
{
#ifdef CONFIG_SMP
__tegra_cpu_reset_handler_data[TEGRA_RESET_MASK_PRESENT] =
*((u32 *)cpu_possible_mask);
__tegra_cpu_reset_handler_data[TEGRA_RESET_STARTUP_SECONDARY] =
virt_to_phys((void *)tegra_secondary_startup);
#endif
#ifdef CONFIG_PM_SLEEP
__tegra_cpu_reset_handler_data[TEGRA_RESET_STARTUP_LP1] =
TEGRA_IRAM_LPx_RESUME_AREA;
__tegra_cpu_reset_handler_data[TEGRA_RESET_STARTUP_LP2] =
virt_to_phys((void *)tegra_resume);
#endif
tegra_cpu_reset_handler_enable();
}
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