b77b6e885c
Support the prepare_idle() firmware call, which is necessary to properly support CPU idling. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Stephen Warren <swarren@nvidia.com>
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/*
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* Trusted Foundations support for ARM CPUs
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*
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* Copyright (c) 2013, NVIDIA Corporation.
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <asm/firmware.h>
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#include <asm/trusted_foundations.h>
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#define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200
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#define TF_CPU_PM 0xfffffffc
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#define TF_CPU_PM_S3 0xffffffe3
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#define TF_CPU_PM_S2 0xffffffe6
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#define TF_CPU_PM_S2_NO_MC_CLK 0xffffffe5
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#define TF_CPU_PM_S1 0xffffffe4
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#define TF_CPU_PM_S1_NOFLUSH_L2 0xffffffe7
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static unsigned long cpu_boot_addr;
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static void __naked tf_generic_smc(u32 type, u32 arg1, u32 arg2)
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{
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asm volatile(
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".arch_extension sec\n\t"
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"stmfd sp!, {r4 - r11, lr}\n\t"
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__asmeq("%0", "r0")
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__asmeq("%1", "r1")
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__asmeq("%2", "r2")
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"mov r3, #0\n\t"
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"mov r4, #0\n\t"
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"smc #0\n\t"
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"ldmfd sp!, {r4 - r11, pc}"
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:
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: "r" (type), "r" (arg1), "r" (arg2)
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: "memory");
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}
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static int tf_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
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{
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cpu_boot_addr = boot_addr;
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tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, cpu_boot_addr, 0);
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return 0;
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}
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static int tf_prepare_idle(void)
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{
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tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S1_NOFLUSH_L2, cpu_boot_addr);
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return 0;
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}
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static const struct firmware_ops trusted_foundations_ops = {
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.set_cpu_boot_addr = tf_set_cpu_boot_addr,
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.prepare_idle = tf_prepare_idle,
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};
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void register_trusted_foundations(struct trusted_foundations_platform_data *pd)
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{
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/*
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* we are not using version information for now since currently
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* supported SMCs are compatible with all TF releases
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*/
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register_firmware_ops(&trusted_foundations_ops);
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}
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void of_register_trusted_foundations(void)
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{
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struct device_node *node;
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struct trusted_foundations_platform_data pdata;
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int err;
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node = of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations");
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if (!node)
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return;
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err = of_property_read_u32(node, "tlm,version-major",
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&pdata.version_major);
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if (err != 0)
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panic("Trusted Foundation: missing version-major property\n");
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err = of_property_read_u32(node, "tlm,version-minor",
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&pdata.version_minor);
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if (err != 0)
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panic("Trusted Foundation: missing version-minor property\n");
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register_trusted_foundations(&pdata);
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}
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