179 lines
4.9 KiB
C
179 lines
4.9 KiB
C
/*
|
|
* 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 <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;
|
|
}
|
|
|
|
/*
|
|
* int bcm_kona_do_smc(u32 service_id, u32 buffer_addr)
|
|
*
|
|
* Only core 0 can run the secure monitor code. If an "smc" request
|
|
* is initiated on a different core it must be redirected to core 0
|
|
* for execution. We rely on the caller to handle this.
|
|
*
|
|
* Each "smc" request supplies a service id and the address of a
|
|
* buffer containing parameters related to the service to be
|
|
* performed. A flags value defines the behavior of the level 2
|
|
* cache and interrupt handling while the secure monitor executes.
|
|
*
|
|
* Parameters to the "smc" request are passed in r4-r6 as follows:
|
|
* r4 service id
|
|
* r5 flags (SEC_ROM_*)
|
|
* r6 physical address of buffer with other parameters
|
|
*
|
|
* Execution of an "smc" request produces two distinct results.
|
|
*
|
|
* First, the secure monitor call itself (regardless of the specific
|
|
* service request) can succeed, or can produce an error. When an
|
|
* "smc" request completes this value is found in r12; it should
|
|
* always be SEC_EXIT_NORMAL.
|
|
*
|
|
* In addition, the particular service performed produces a result.
|
|
* The values that should be expected depend on the service. We
|
|
* therefore return this value to the caller, so it can handle the
|
|
* request result appropriately. This result value is found in r0
|
|
* when the "smc" request completes.
|
|
*/
|
|
static int bcm_kona_do_smc(u32 service_id, u32 buffer_phys)
|
|
{
|
|
register u32 ip asm("ip"); /* Also called r12 */
|
|
register u32 r0 asm("r0");
|
|
register u32 r4 asm("r4");
|
|
register u32 r5 asm("r5");
|
|
register u32 r6 asm("r6");
|
|
|
|
r4 = service_id;
|
|
r5 = 0x3; /* Keep IRQ and FIQ off in SM */
|
|
r6 = buffer_phys;
|
|
|
|
asm volatile (
|
|
/* Make sure we got the registers we want */
|
|
__asmeq("%0", "ip")
|
|
__asmeq("%1", "r0")
|
|
__asmeq("%2", "r4")
|
|
__asmeq("%3", "r5")
|
|
__asmeq("%4", "r6")
|
|
".arch_extension sec\n"
|
|
" smc #0\n"
|
|
: "=r" (ip), "=r" (r0)
|
|
: "r" (r4), "r" (r5), "r" (r6)
|
|
: "r1", "r2", "r3", "r7", "lr");
|
|
|
|
BUG_ON(ip != SEC_EXIT_NORMAL);
|
|
|
|
return r0;
|
|
}
|
|
|
|
/* __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 __iomem *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_do_smc(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;
|
|
}
|