// SPDX-License-Identifier: GPL-2.0-only
/*
* OMAP Secure API infrastructure.
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Santosh Shilimkar <[email protected]>
* Copyright (C) 2012 Ivaylo Dimitrov <[email protected]>
* Copyright (C) 2013 Pali Rohár <[email protected]>
*/
#include <linux/arm-smccc.h>
#include <linux/cpu_pm.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <asm/cacheflush.h>
#include <asm/memblock.h>
#include "common.h"
#include "omap-secure.h"
#include "soc.h"
static phys_addr_t omap_secure_memblock_base;
bool optee_available;
#define OMAP_SIP_SMC_STD_CALL_VAL(func_num) \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, ARM_SMCCC_SMC_32, \
ARM_SMCCC_OWNER_SIP, (func_num))
static void __init omap_optee_init_check(void)
{
struct device_node *np;
/*
* We only check that the OP-TEE node is present and available. The
* OP-TEE kernel driver is not needed for the type of interaction made
* with OP-TEE here so the driver's status is not checked.
*/
np = of_find_node_by_path("/firmware/optee");
if (np && of_device_is_available(np))
optee_available = true;
of_node_put(np);
}
/**
* omap_secure_dispatcher - Routine to dispatch low power secure
* service routines
* @idx: The HAL API index
* @flag: The flag indicating criticality of operation
* @nargs: Number of valid arguments out of four.
* @arg1, arg2, arg3 args4: Parameters passed to secure API
*
* Return the non-zero error value on failure.
*/
u32 omap_secure_dispatcher(u32 idx, u32 flag, u32 nargs, u32 arg1, u32 arg2,
u32 arg3, u32 arg4)
{
static u32 buf[NR_CPUS][5];
u32 *param;
int cpu;
u32 ret;
cpu = get_cpu();
param = buf[cpu];
param[0] = nargs;
param[1] = arg1;
param[2] = arg2;
param[3] = arg3;
param[4] = arg4;
/*
* Secure API needs physical address
* pointer for the parameters
*/
flush_cache_all();
outer_clean_range(__pa(param), __pa(param + 5));
ret = omap_smc2(idx, flag, __pa(param));
put_cpu();
return ret;
}
void omap_smccc_smc(u32 fn, u32 arg)
{
struct arm_smccc_res res;
arm_smccc_smc(OMAP_SIP_SMC_STD_CALL_VAL(fn), arg,
0, 0, 0, 0, 0, 0, &res);
WARN(res.a0, "Secure function call 0x%08x failed\n", fn);
}
void omap_smc1(u32 fn, u32 arg)
{
/*
* If this platform has OP-TEE installed we use ARM SMC calls
* otherwise fall back to the OMAP ROM style calls.
*/
if (optee_available)
omap_smccc_smc(fn, arg);
else
_omap_smc1(fn, arg);
}
/* Allocate the memory to save secure ram */
int __init omap_secure_ram_reserve_memblock(void)
{
u32 size = OMAP_SECURE_RAM_STORAGE;
size = ALIGN(size, SECTION_SIZE);
omap_secure_memblock_base = arm_memblock_steal(size, SECTION_SIZE);
return 0;
}
#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
u32 omap3_save_secure_ram(void *addr, int size)
{
static u32 param[5];
u32 ret;
if (size != OMAP3_SAVE_SECURE_RAM_SZ)
return OMAP3_SAVE_SECURE_RAM_SZ;
param[0] = 4; /* Number of arguments */
param[1] = __pa(addr); /* Physical address for saving */
param[2] = 0;
param[3] = 1;
param[4] = 1;
ret = save_secure_ram_context(__pa(param));
return ret;
}
#endif
/**
* rx51_secure_dispatcher: Routine to dispatch secure PPA API calls
* @idx: The PPA API index
* @process: Process ID
* @flag: The flag indicating criticality of operation
* @nargs: Number of valid arguments out of four.
* @arg1, arg2, arg3 args4: Parameters passed to secure API
*
* Return the non-zero error value on failure.
*
* NOTE: rx51_secure_dispatcher differs from omap_secure_dispatcher because
* it calling omap_smc3() instead omap_smc2() and param[0] is nargs+1
*/
static u32 rx51_secure_dispatcher(u32 idx, u32 process, u32 flag, u32 nargs,
u32 arg1, u32 arg2, u32 arg3, u32 arg4)
{
static u32 param[5];
u32 ret;
param[0] = nargs+1; /* RX-51 needs number of arguments + 1 */
param[1] = arg1;
param[2] = arg2;
param[3] = arg3;
param[4] = arg4;
/*
* Secure API needs physical address
* pointer for the parameters
*/
local_irq_disable();
local_fiq_disable();
flush_cache_all();
outer_clean_range(__pa(param), __pa(param + 5));
ret = omap_smc3(idx, process, flag, __pa(param));
flush_cache_all();
local_fiq_enable();
local_irq_enable();
return ret;
}
/**
* rx51_secure_update_aux_cr: Routine to modify the contents of Auxiliary Control Register
* @set_bits: bits to set in ACR
* @clear_bits: bits to clear in ACR
*
* Return the non-zero error value on failure.
*/
u32 rx51_secure_update_aux_cr(u32 set_bits, u32 clear_bits)
{
u32 acr;
/* Read ACR */
asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
acr &= ~clear_bits;
acr |= set_bits;
return rx51_secure_dispatcher(RX51_PPA_WRITE_ACR,
0,
FLAG_START_CRITICAL,
1, acr, 0, 0, 0);
}
/**
* rx51_secure_rng_call: Routine for HW random generator
*/
u32 rx51_secure_rng_call(u32 ptr, u32 count, u32 flag)
{
return rx51_secure_dispatcher(RX51_PPA_HWRNG,
0,
NO_FLAG,
3, ptr, count, flag, 0);
}
void __init omap_secure_init(void)
{
omap_optee_init_check();
}
/*
* Dummy dispatcher call after core OSWR and MPU off. Updates the ROM return
* address after MMU has been re-enabled after CPU1 has been woken up again.
* Otherwise the ROM code will attempt to use the earlier physical return
* address that got set with MMU off when waking up CPU1. Only used on secure
* devices.
*/
static int cpu_notifier(struct notifier_block *nb, unsigned long cmd, void *v)
{
switch (cmd) {
case CPU_CLUSTER_PM_EXIT:
omap_secure_dispatcher(OMAP4_PPA_SERVICE_0,
FLAG_START_CRITICAL,
0, 0, 0, 0, 0);
break;
default:
break;
}
return NOTIFY_OK;
}
static struct notifier_block secure_notifier_block = {
.notifier_call = cpu_notifier,
};
static int __init secure_pm_init(void)
{
if (omap_type() == OMAP2_DEVICE_TYPE_GP || !soc_is_omap44xx())
return 0;
cpu_pm_register_notifier(&secure_notifier_block);
return 0;
}
omap_arch_initcall(secure_pm_init);
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