mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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bca28f8f6b
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>
71 lines
1.5 KiB
C
71 lines
1.5 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/firmware.h>
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#include <mach/map.h>
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#include "smc.h"
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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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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 = S5P_VA_SYSRAM_NS + 0x1c + 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 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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};
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void __init exynos_firmware_init(void)
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{
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if (of_have_populated_dt()) {
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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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}
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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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