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/*
* Copyright (C) 2013 Broadcom 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 version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <stdarg.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <asm/cacheflush.h>
#include <linux/of_address.h>
#include "bcm_kona_smc.h"
struct secure_bridge_data {
void __iomem *bounce; /* virtual address */
u32 __iomem buffer_addr; /* physical address */
int initialized;
} bridge_data;
struct bcm_kona_smc_data {
unsigned service_id;
unsigned arg0;
unsigned arg1;
unsigned arg2;
unsigned arg3;
};
static const struct of_device_id bcm_kona_smc_ids[] __initconst = {
{.compatible = "bcm,kona-smc"},
{},
};
/* Map in the bounce area */
void __init bcm_kona_smc_init(void)
{
struct device_node *node;
/* Read buffer addr and size from the device tree node */
node = of_find_matching_node(NULL, bcm_kona_smc_ids);
BUG_ON(!node);
/* Don't care about size or flags of the DT node */
bridge_data.buffer_addr =
be32_to_cpu(*of_get_address(node, 0, NULL, NULL));
BUG_ON(!bridge_data.buffer_addr);
bridge_data.bounce = of_iomap(node, 0);
BUG_ON(!bridge_data.bounce);
bridge_data.initialized = 1;
pr_info("Secure API initialized!\n");
}
/* __bcm_kona_smc() should only run on CPU 0, with pre-emption disabled */
static void __bcm_kona_smc(void *info)
{
struct bcm_kona_smc_data *data = info;
u32 *args = bridge_data.bounce;
int rc = 0;
/* Must run on CPU 0 */
BUG_ON(smp_processor_id() != 0);
/* Check map in the bounce area */
BUG_ON(!bridge_data.initialized);
/* Copy one 32 bit word into the bounce area */
args[0] = data->arg0;
args[1] = data->arg1;
args[2] = data->arg2;
args[3] = data->arg3;
/* Flush caches for input data passed to Secure Monitor */
if (data->service_id != SSAPI_BRCM_START_VC_CORE)
flush_cache_all();
/* Trap into Secure Monitor */
rc = bcm_kona_smc_asm(data->service_id, bridge_data.buffer_addr);
if (rc != SEC_ROM_RET_OK)
pr_err("Secure Monitor call failed (0x%x)!\n", rc);
}
unsigned bcm_kona_smc(unsigned service_id, unsigned arg0, unsigned arg1,
unsigned arg2, unsigned arg3)
{
struct bcm_kona_smc_data data;
data.service_id = service_id;
data.arg0 = arg0;
data.arg1 = arg1;
data.arg2 = arg2;
data.arg3 = arg3;
/*
* Due to a limitation of the secure monitor, we must use the SMP
* infrastructure to forward all secure monitor calls to Core 0.
*/
if (get_cpu() != 0)
smp_call_function_single(0, __bcm_kona_smc, (void *)&data, 1);
else
__bcm_kona_smc(&data);
put_cpu();
return 0;
}
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