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/*
* OMAP Secure API infrastructure.
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Santosh Shilimkar <santosh.shilimkar@ti.com>
* Copyright (C) 2012 Ivaylo Dimitrov <freemangordon@abv.bg>
* Copyright (C) 2013 Pali Rohár <pali.rohar@gmail.com>
*
*
* This program is free software,you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <asm/cacheflush.h>
#include <asm/memblock.h>
#include "omap-secure.h"
static phys_addr_t omap_secure_memblock_base;
/**
* omap_sec_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)
{
u32 ret;
u32 param[5];
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));
return ret;
}
/* 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;
}
phys_addr_t omap_secure_ram_mempool_base(void)
{
return omap_secure_memblock_base;
}
/**
* 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
*/
u32 rx51_secure_dispatcher(u32 idx, u32 process, u32 flag, u32 nargs,
u32 arg1, u32 arg2, u32 arg3, u32 arg4)
{
u32 ret;
u32 param[5];
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
* @clr_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);
}
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