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2b9d9c321b
On a numer of Exynos-based boards Linux kernel is running in non-secure mode under a secure firmware. This means that certain operations need to be handled in special way, with firmware assistance. System-wide suspend/resume is an example of such operations. This patch adds support for firmware-assisted suspend/resume by leveraging recently introduced suspend and resume firmware operations and modifying existing suspend/resume paths to account for presence of secure firmware. Signed-off-by: Tomasz Figa <t.figa@samsung.com> [kgene.kim@samsung.com: rebased] Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
143 lines
3.1 KiB
C
143 lines
3.1 KiB
C
/*
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* Copyright (C) 2012 Samsung Electronics.
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* Kyungmin Park <kyungmin.park@samsung.com>
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* Tomasz Figa <t.figa@samsung.com>
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*
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* This program is free software,you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <asm/cacheflush.h>
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#include <asm/cputype.h>
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#include <asm/firmware.h>
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#include <asm/suspend.h>
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#include <mach/map.h>
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#include "common.h"
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#include "smc.h"
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#define EXYNOS_SLEEP_MAGIC 0x00000bad
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#define EXYNOS_BOOT_ADDR 0x8
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#define EXYNOS_BOOT_FLAG 0xc
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static int exynos_do_idle(void)
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{
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exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
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return 0;
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}
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static int exynos_cpu_boot(int cpu)
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{
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/*
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* Exynos3250 doesn't need to send smc command for secondary CPU boot
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* because Exynos3250 removes WFE in secure mode.
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*/
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if (soc_is_exynos3250())
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return 0;
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/*
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* The second parameter of SMC_CMD_CPU1BOOT command means CPU id.
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* But, Exynos4212 has only one secondary CPU so second parameter
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* isn't used for informing secure firmware about CPU id.
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*/
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if (soc_is_exynos4212())
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cpu = 0;
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exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
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return 0;
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}
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static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
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{
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void __iomem *boot_reg;
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if (!sysram_ns_base_addr)
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return -ENODEV;
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boot_reg = sysram_ns_base_addr + 0x1c;
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/*
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* Almost all Exynos-series of SoCs that run in secure mode don't need
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* additional offset for every CPU, with Exynos4412 being the only
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* exception.
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*/
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if (soc_is_exynos4412())
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boot_reg += 4 * cpu;
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__raw_writel(boot_addr, boot_reg);
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return 0;
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}
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static int exynos_cpu_suspend(unsigned long arg)
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{
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flush_cache_all();
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outer_flush_all();
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exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
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pr_info("Failed to suspend the system\n");
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writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
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return 1;
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}
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static int exynos_suspend(void)
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{
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if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
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/* Save Power control and Diagnostic registers */
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asm ("mrc p15, 0, %0, c15, c0, 0\n"
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"mrc p15, 0, %1, c15, c0, 1\n"
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: "=r" (cp15_save_power), "=r" (cp15_save_diag)
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: : "cc");
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}
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writel(EXYNOS_SLEEP_MAGIC, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
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writel(virt_to_phys(exynos_cpu_resume_ns),
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sysram_ns_base_addr + EXYNOS_BOOT_ADDR);
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return cpu_suspend(0, exynos_cpu_suspend);
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}
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static int exynos_resume(void)
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{
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writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
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return 0;
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}
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static const struct firmware_ops exynos_firmware_ops = {
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.do_idle = exynos_do_idle,
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.set_cpu_boot_addr = exynos_set_cpu_boot_addr,
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.cpu_boot = exynos_cpu_boot,
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.suspend = exynos_suspend,
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.resume = exynos_resume,
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};
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void __init exynos_firmware_init(void)
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{
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struct device_node *nd;
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const __be32 *addr;
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nd = of_find_compatible_node(NULL, NULL,
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"samsung,secure-firmware");
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if (!nd)
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return;
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addr = of_get_address(nd, 0, NULL, NULL);
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if (!addr) {
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pr_err("%s: No address specified.\n", __func__);
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return;
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}
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pr_info("Running under secure firmware.\n");
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register_firmware_ops(&exynos_firmware_ops);
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}
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