mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 21:24:00 +08:00
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>
100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/*
|
|
* Trusted Foundations support for ARM CPUs
|
|
*
|
|
* Copyright (c) 2013, NVIDIA Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* 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/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/of.h>
|
|
#include <asm/firmware.h>
|
|
#include <asm/trusted_foundations.h>
|
|
|
|
#define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200
|
|
|
|
#define TF_CPU_PM 0xfffffffc
|
|
#define TF_CPU_PM_S3 0xffffffe3
|
|
#define TF_CPU_PM_S2 0xffffffe6
|
|
#define TF_CPU_PM_S2_NO_MC_CLK 0xffffffe5
|
|
#define TF_CPU_PM_S1 0xffffffe4
|
|
#define TF_CPU_PM_S1_NOFLUSH_L2 0xffffffe7
|
|
|
|
static unsigned long cpu_boot_addr;
|
|
|
|
static void __naked tf_generic_smc(u32 type, u32 arg1, u32 arg2)
|
|
{
|
|
asm volatile(
|
|
".arch_extension sec\n\t"
|
|
"stmfd sp!, {r4 - r11, lr}\n\t"
|
|
__asmeq("%0", "r0")
|
|
__asmeq("%1", "r1")
|
|
__asmeq("%2", "r2")
|
|
"mov r3, #0\n\t"
|
|
"mov r4, #0\n\t"
|
|
"smc #0\n\t"
|
|
"ldmfd sp!, {r4 - r11, pc}"
|
|
:
|
|
: "r" (type), "r" (arg1), "r" (arg2)
|
|
: "memory");
|
|
}
|
|
|
|
static int tf_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
|
|
{
|
|
cpu_boot_addr = boot_addr;
|
|
tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, cpu_boot_addr, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tf_prepare_idle(void)
|
|
{
|
|
tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S1_NOFLUSH_L2, cpu_boot_addr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct firmware_ops trusted_foundations_ops = {
|
|
.set_cpu_boot_addr = tf_set_cpu_boot_addr,
|
|
.prepare_idle = tf_prepare_idle,
|
|
};
|
|
|
|
void register_trusted_foundations(struct trusted_foundations_platform_data *pd)
|
|
{
|
|
/*
|
|
* we are not using version information for now since currently
|
|
* supported SMCs are compatible with all TF releases
|
|
*/
|
|
register_firmware_ops(&trusted_foundations_ops);
|
|
}
|
|
|
|
void of_register_trusted_foundations(void)
|
|
{
|
|
struct device_node *node;
|
|
struct trusted_foundations_platform_data pdata;
|
|
int err;
|
|
|
|
node = of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations");
|
|
if (!node)
|
|
return;
|
|
|
|
err = of_property_read_u32(node, "tlm,version-major",
|
|
&pdata.version_major);
|
|
if (err != 0)
|
|
panic("Trusted Foundation: missing version-major property\n");
|
|
err = of_property_read_u32(node, "tlm,version-minor",
|
|
&pdata.version_minor);
|
|
if (err != 0)
|
|
panic("Trusted Foundation: missing version-minor property\n");
|
|
register_trusted_foundations(&pdata);
|
|
}
|