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* Amlogic Secure Monitor driver
*
* Copyright (C) 2016 Endless Mobile, Inc.
* Author: Carlo Caione <carlo@endlessm.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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define pr_fmt(fmt) "meson-sm: " fmt
#include <linux/arm-smccc.h>
#include <linux/bug.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/printk.h>
#include <linux/types.h>
#include <linux/sizes.h>
#include <linux/firmware/meson/meson_sm.h>
struct meson_sm_cmd {
unsigned int index;
u32 smc_id;
};
#define CMD(d, s) { .index = (d), .smc_id = (s), }
struct meson_sm_chip {
unsigned int shmem_size;
u32 cmd_shmem_in_base;
u32 cmd_shmem_out_base;
struct meson_sm_cmd cmd[];
};
struct meson_sm_chip gxbb_chip = {
.shmem_size = SZ_4K,
.cmd_shmem_in_base = 0x82000020,
.cmd_shmem_out_base = 0x82000021,
.cmd = {
CMD(SM_EFUSE_READ, 0x82000030),
CMD(SM_EFUSE_WRITE, 0x82000031),
CMD(SM_EFUSE_USER_MAX, 0x82000033),
{ /* sentinel */ },
},
};
struct meson_sm_firmware {
const struct meson_sm_chip *chip;
void __iomem *sm_shmem_in_base;
void __iomem *sm_shmem_out_base;
};
static struct meson_sm_firmware fw;
static u32 meson_sm_get_cmd(const struct meson_sm_chip *chip,
unsigned int cmd_index)
{
const struct meson_sm_cmd *cmd = chip->cmd;
while (cmd->smc_id && cmd->index != cmd_index)
cmd++;
return cmd->smc_id;
}
static u32 __meson_sm_call(u32 cmd, u32 arg0, u32 arg1, u32 arg2,
u32 arg3, u32 arg4)
{
struct arm_smccc_res res;
arm_smccc_smc(cmd, arg0, arg1, arg2, arg3, arg4, 0, 0, &res);
return res.a0;
}
static void __iomem *meson_sm_map_shmem(u32 cmd_shmem, unsigned int size)
{
u32 sm_phy_base;
sm_phy_base = __meson_sm_call(cmd_shmem, 0, 0, 0, 0, 0);
if (!sm_phy_base)
return 0;
return ioremap_cache(sm_phy_base, size);
}
/**
* meson_sm_call - generic SMC32 call to the secure-monitor
*
* @cmd_index: Index of the SMC32 function ID
* @ret: Returned value
* @arg0: SMC32 Argument 0
* @arg1: SMC32 Argument 1
* @arg2: SMC32 Argument 2
* @arg3: SMC32 Argument 3
* @arg4: SMC32 Argument 4
*
* Return: 0 on success, a negative value on error
*/
int meson_sm_call(unsigned int cmd_index, u32 *ret, u32 arg0,
u32 arg1, u32 arg2, u32 arg3, u32 arg4)
{
u32 cmd, lret;
if (!fw.chip)
return -ENOENT;
cmd = meson_sm_get_cmd(fw.chip, cmd_index);
if (!cmd)
return -EINVAL;
lret = __meson_sm_call(cmd, arg0, arg1, arg2, arg3, arg4);
if (ret)
*ret = lret;
return 0;
}
EXPORT_SYMBOL(meson_sm_call);
/**
* meson_sm_call_read - retrieve data from secure-monitor
*
* @buffer: Buffer to store the retrieved data
* @cmd_index: Index of the SMC32 function ID
* @arg0: SMC32 Argument 0
* @arg1: SMC32 Argument 1
* @arg2: SMC32 Argument 2
* @arg3: SMC32 Argument 3
* @arg4: SMC32 Argument 4
*
* Return: size of read data on success, a negative value on error
*/
int meson_sm_call_read(void *buffer, unsigned int cmd_index, u32 arg0,
u32 arg1, u32 arg2, u32 arg3, u32 arg4)
{
u32 size;
if (!fw.chip)
return -ENOENT;
if (!fw.chip->cmd_shmem_out_base)
return -EINVAL;
if (meson_sm_call(cmd_index, &size, arg0, arg1, arg2, arg3, arg4) < 0)
return -EINVAL;
if (!size || size > fw.chip->shmem_size)
return -EINVAL;
if (buffer)
memcpy(buffer, fw.sm_shmem_out_base, size);
return size;
}
EXPORT_SYMBOL(meson_sm_call_read);
/**
* meson_sm_call_write - send data to secure-monitor
*
* @buffer: Buffer containing data to send
* @size: Size of the data to send
* @cmd_index: Index of the SMC32 function ID
* @arg0: SMC32 Argument 0
* @arg1: SMC32 Argument 1
* @arg2: SMC32 Argument 2
* @arg3: SMC32 Argument 3
* @arg4: SMC32 Argument 4
*
* Return: size of sent data on success, a negative value on error
*/
int meson_sm_call_write(void *buffer, unsigned int size, unsigned int cmd_index,
u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4)
{
u32 written;
if (!fw.chip)
return -ENOENT;
if (size > fw.chip->shmem_size)
return -EINVAL;
if (!fw.chip->cmd_shmem_in_base)
return -EINVAL;
memcpy(fw.sm_shmem_in_base, buffer, size);
if (meson_sm_call(cmd_index, &written, arg0, arg1, arg2, arg3, arg4) < 0)
return -EINVAL;
if (!written)
return -EINVAL;
return written;
}
EXPORT_SYMBOL(meson_sm_call_write);
static const struct of_device_id meson_sm_ids[] = {
{ .compatible = "amlogic,meson-gxbb-sm", .data = &gxbb_chip },
{ /* sentinel */ },
};
int __init meson_sm_init(void)
{
const struct meson_sm_chip *chip;
const struct of_device_id *matched_np;
struct device_node *np;
np = of_find_matching_node_and_match(NULL, meson_sm_ids, &matched_np);
if (!np)
return -ENODEV;
chip = matched_np->data;
if (!chip) {
pr_err("unable to setup secure-monitor data\n");
goto out;
}
if (chip->cmd_shmem_in_base) {
fw.sm_shmem_in_base = meson_sm_map_shmem(chip->cmd_shmem_in_base,
chip->shmem_size);
if (WARN_ON(!fw.sm_shmem_in_base))
goto out;
}
if (chip->cmd_shmem_out_base) {
fw.sm_shmem_out_base = meson_sm_map_shmem(chip->cmd_shmem_out_base,
chip->shmem_size);
if (WARN_ON(!fw.sm_shmem_out_base))
goto out_in_base;
}
fw.chip = chip;
pr_info("secure-monitor enabled\n");
return 0;
out_in_base:
iounmap(fw.sm_shmem_in_base);
out:
return -EINVAL;
}
device_initcall(meson_sm_init);
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