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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"
static u32 bcm_smc_buffer_phys; /* physical address */
static void __iomem *bcm_smc_buffer; /* virtual address */
struct bcm_kona_smc_data {
unsigned service_id;
unsigned arg0;
unsigned arg1;
unsigned arg2;
unsigned arg3;
unsigned result;
};
static const struct of_device_id bcm_kona_smc_ids[] __initconst = {
{.compatible = "brcm,kona-smc"},
{.compatible = "bcm,kona-smc"}, /* deprecated name */
{},
};
/* Map in the args buffer area */
int __init bcm_kona_smc_init(void)
{
struct device_node *node;
const __be32 *prop_val;
u64 prop_size = 0;
unsigned long buffer_size;
u32 buffer_phys;
/* Read buffer addr and size from the device tree node */
node = of_find_matching_node(NULL, bcm_kona_smc_ids);
if (!node)
return -ENODEV;
prop_val = of_get_address(node, 0, &prop_size, NULL);
if (!prop_val)
return -EINVAL;
/* We assume space for four 32-bit arguments */
if (prop_size < 4 * sizeof(u32) || prop_size > (u64)ULONG_MAX)
return -EINVAL;
buffer_size = (unsigned long)prop_size;
buffer_phys = be32_to_cpup(prop_val);
if (!buffer_phys)
return -EINVAL;
bcm_smc_buffer = ioremap(buffer_phys, buffer_size);
if (!bcm_smc_buffer)
return -ENOMEM;
bcm_smc_buffer_phys = buffer_phys;
pr_info("Kona Secure API initialized\n");
return 0;
}
/* __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 = bcm_smc_buffer;
BUG_ON(smp_processor_id() != 0);
BUG_ON(!args);
/* Copy the four 32 bit argument values into the bounce area */
writel_relaxed(data->arg0, args++);
writel_relaxed(data->arg1, args++);
writel_relaxed(data->arg2, args++);
writel(data->arg3, args);
/* Flush caches for input data passed to Secure Monitor */
flush_cache_all();
/* Trap into Secure Monitor and record the request result */
data->result = bcm_kona_smc_asm(data->service_id, bcm_smc_buffer_phys);
}
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;
data.result = 0;
/*
* Due to a limitation of the secure monitor, we must use the SMP
* infrastructure to forward all secure monitor calls to Core 0.
*/
smp_call_function_single(0, __bcm_kona_smc, &data, 1);
return data.result;
}
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