334 lines
7.4 KiB
C
334 lines
7.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Amlogic Secure Monitor driver
|
|
*
|
|
* Copyright (C) 2016 Endless Mobile, Inc.
|
|
* Author: Carlo Caione <carlo@endlessm.com>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "meson-sm: " fmt
|
|
|
|
#include <linux/arm-smccc.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/printk.h>
|
|
#include <linux/types.h>
|
|
#include <linux/sizes.h>
|
|
#include <linux/slab.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[];
|
|
};
|
|
|
|
static const 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),
|
|
CMD(SM_GET_CHIP_ID, 0x82000044),
|
|
CMD(SM_A1_PWRC_SET, 0x82000093),
|
|
CMD(SM_A1_PWRC_GET, 0x82000095),
|
|
{ /* sentinel */ },
|
|
},
|
|
};
|
|
|
|
struct meson_sm_firmware {
|
|
const struct meson_sm_chip *chip;
|
|
void __iomem *sm_shmem_in_base;
|
|
void __iomem *sm_shmem_out_base;
|
|
};
|
|
|
|
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
|
|
*
|
|
* @fw: Pointer to secure-monitor firmware
|
|
* @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(struct meson_sm_firmware *fw, 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
|
|
*
|
|
* @fw: Pointer to secure-monitor firmware
|
|
* @buffer: Buffer to store the retrieved data
|
|
* @bsize: Size of the buffer
|
|
* @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
|
|
* When 0 is returned there is no guarantee about the amount of
|
|
* data read and bsize bytes are copied in buffer.
|
|
*/
|
|
int meson_sm_call_read(struct meson_sm_firmware *fw, void *buffer,
|
|
unsigned int bsize, unsigned int cmd_index, u32 arg0,
|
|
u32 arg1, u32 arg2, u32 arg3, u32 arg4)
|
|
{
|
|
u32 size;
|
|
int ret;
|
|
|
|
if (!fw->chip)
|
|
return -ENOENT;
|
|
|
|
if (!fw->chip->cmd_shmem_out_base)
|
|
return -EINVAL;
|
|
|
|
if (bsize > fw->chip->shmem_size)
|
|
return -EINVAL;
|
|
|
|
if (meson_sm_call(fw, cmd_index, &size, arg0, arg1, arg2, arg3, arg4) < 0)
|
|
return -EINVAL;
|
|
|
|
if (size > bsize)
|
|
return -EINVAL;
|
|
|
|
ret = size;
|
|
|
|
if (!size)
|
|
size = bsize;
|
|
|
|
if (buffer)
|
|
memcpy(buffer, fw->sm_shmem_out_base, size);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(meson_sm_call_read);
|
|
|
|
/**
|
|
* meson_sm_call_write - send data to secure-monitor
|
|
*
|
|
* @fw: Pointer to secure-monitor firmware
|
|
* @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(struct meson_sm_firmware *fw, 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(fw, cmd_index, &written, arg0, arg1, arg2, arg3, arg4) < 0)
|
|
return -EINVAL;
|
|
|
|
if (!written)
|
|
return -EINVAL;
|
|
|
|
return written;
|
|
}
|
|
EXPORT_SYMBOL(meson_sm_call_write);
|
|
|
|
/**
|
|
* meson_sm_get - get pointer to meson_sm_firmware structure.
|
|
*
|
|
* @sm_node: Pointer to the secure-monitor Device Tree node.
|
|
*
|
|
* Return: NULL is the secure-monitor device is not ready.
|
|
*/
|
|
struct meson_sm_firmware *meson_sm_get(struct device_node *sm_node)
|
|
{
|
|
struct platform_device *pdev = of_find_device_by_node(sm_node);
|
|
|
|
if (!pdev)
|
|
return NULL;
|
|
|
|
return platform_get_drvdata(pdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(meson_sm_get);
|
|
|
|
#define SM_CHIP_ID_LENGTH 119
|
|
#define SM_CHIP_ID_OFFSET 4
|
|
#define SM_CHIP_ID_SIZE 12
|
|
|
|
static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct meson_sm_firmware *fw;
|
|
uint8_t *id_buf;
|
|
int ret;
|
|
|
|
fw = platform_get_drvdata(pdev);
|
|
|
|
id_buf = kmalloc(SM_CHIP_ID_LENGTH, GFP_KERNEL);
|
|
if (!id_buf)
|
|
return -ENOMEM;
|
|
|
|
ret = meson_sm_call_read(fw, id_buf, SM_CHIP_ID_LENGTH, SM_GET_CHIP_ID,
|
|
0, 0, 0, 0, 0);
|
|
if (ret < 0) {
|
|
kfree(id_buf);
|
|
return ret;
|
|
}
|
|
|
|
ret = sprintf(buf, "%12phN\n", &id_buf[SM_CHIP_ID_OFFSET]);
|
|
|
|
kfree(id_buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(serial);
|
|
|
|
static struct attribute *meson_sm_sysfs_attributes[] = {
|
|
&dev_attr_serial.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group meson_sm_sysfs_attr_group = {
|
|
.attrs = meson_sm_sysfs_attributes,
|
|
};
|
|
|
|
static const struct of_device_id meson_sm_ids[] = {
|
|
{ .compatible = "amlogic,meson-gxbb-sm", .data = &gxbb_chip },
|
|
{ /* sentinel */ },
|
|
};
|
|
|
|
static int __init meson_sm_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
const struct meson_sm_chip *chip;
|
|
struct meson_sm_firmware *fw;
|
|
|
|
fw = devm_kzalloc(dev, sizeof(*fw), GFP_KERNEL);
|
|
if (!fw)
|
|
return -ENOMEM;
|
|
|
|
chip = of_match_device(meson_sm_ids, dev)->data;
|
|
|
|
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;
|
|
|
|
platform_set_drvdata(pdev, fw);
|
|
|
|
pr_info("secure-monitor enabled\n");
|
|
|
|
if (sysfs_create_group(&pdev->dev.kobj, &meson_sm_sysfs_attr_group))
|
|
goto out_in_base;
|
|
|
|
return 0;
|
|
|
|
out_in_base:
|
|
iounmap(fw->sm_shmem_in_base);
|
|
out:
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct platform_driver meson_sm_driver = {
|
|
.driver = {
|
|
.name = "meson-sm",
|
|
.of_match_table = of_match_ptr(meson_sm_ids),
|
|
},
|
|
};
|
|
module_platform_driver_probe(meson_sm_driver, meson_sm_probe);
|