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0789724f86
The Amlogic Meson SoC Secure Monitor implements a call to retrieve an unique SoC ID starting from the GX Family and all new families. The serial number is simply exposed as a sysfs entry under the firmware sysfs directory. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
315 lines
7 KiB
C
315 lines
7 KiB
C
/*
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* Amlogic Secure Monitor driver
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*
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* Copyright (C) 2016 Endless Mobile, Inc.
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* Author: Carlo Caione <carlo@endlessm.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define pr_fmt(fmt) "meson-sm: " fmt
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#include <linux/arm-smccc.h>
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#include <linux/bug.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/printk.h>
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#include <linux/types.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/firmware/meson/meson_sm.h>
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struct meson_sm_cmd {
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unsigned int index;
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u32 smc_id;
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};
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#define CMD(d, s) { .index = (d), .smc_id = (s), }
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struct meson_sm_chip {
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unsigned int shmem_size;
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u32 cmd_shmem_in_base;
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u32 cmd_shmem_out_base;
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struct meson_sm_cmd cmd[];
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};
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struct meson_sm_chip gxbb_chip = {
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.shmem_size = SZ_4K,
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.cmd_shmem_in_base = 0x82000020,
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.cmd_shmem_out_base = 0x82000021,
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.cmd = {
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CMD(SM_EFUSE_READ, 0x82000030),
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CMD(SM_EFUSE_WRITE, 0x82000031),
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CMD(SM_EFUSE_USER_MAX, 0x82000033),
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CMD(SM_GET_CHIP_ID, 0x82000044),
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{ /* sentinel */ },
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},
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};
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struct meson_sm_firmware {
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const struct meson_sm_chip *chip;
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void __iomem *sm_shmem_in_base;
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void __iomem *sm_shmem_out_base;
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};
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static struct meson_sm_firmware fw;
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static u32 meson_sm_get_cmd(const struct meson_sm_chip *chip,
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unsigned int cmd_index)
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{
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const struct meson_sm_cmd *cmd = chip->cmd;
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while (cmd->smc_id && cmd->index != cmd_index)
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cmd++;
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return cmd->smc_id;
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}
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static u32 __meson_sm_call(u32 cmd, u32 arg0, u32 arg1, u32 arg2,
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u32 arg3, u32 arg4)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(cmd, arg0, arg1, arg2, arg3, arg4, 0, 0, &res);
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return res.a0;
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}
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static void __iomem *meson_sm_map_shmem(u32 cmd_shmem, unsigned int size)
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{
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u32 sm_phy_base;
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sm_phy_base = __meson_sm_call(cmd_shmem, 0, 0, 0, 0, 0);
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if (!sm_phy_base)
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return 0;
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return ioremap_cache(sm_phy_base, size);
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}
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/**
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* meson_sm_call - generic SMC32 call to the secure-monitor
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*
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* @cmd_index: Index of the SMC32 function ID
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* @ret: Returned value
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* @arg0: SMC32 Argument 0
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* @arg1: SMC32 Argument 1
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* @arg2: SMC32 Argument 2
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* @arg3: SMC32 Argument 3
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* @arg4: SMC32 Argument 4
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*
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* Return: 0 on success, a negative value on error
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*/
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int meson_sm_call(unsigned int cmd_index, u32 *ret, u32 arg0,
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u32 arg1, u32 arg2, u32 arg3, u32 arg4)
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{
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u32 cmd, lret;
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if (!fw.chip)
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return -ENOENT;
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cmd = meson_sm_get_cmd(fw.chip, cmd_index);
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if (!cmd)
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return -EINVAL;
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lret = __meson_sm_call(cmd, arg0, arg1, arg2, arg3, arg4);
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if (ret)
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*ret = lret;
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return 0;
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}
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EXPORT_SYMBOL(meson_sm_call);
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/**
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* meson_sm_call_read - retrieve data from secure-monitor
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*
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* @buffer: Buffer to store the retrieved data
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* @bsize: Size of the buffer
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* @cmd_index: Index of the SMC32 function ID
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* @arg0: SMC32 Argument 0
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* @arg1: SMC32 Argument 1
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* @arg2: SMC32 Argument 2
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* @arg3: SMC32 Argument 3
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* @arg4: SMC32 Argument 4
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*
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* Return: size of read data on success, a negative value on error
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* When 0 is returned there is no guarantee about the amount of
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* data read and bsize bytes are copied in buffer.
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*/
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int meson_sm_call_read(void *buffer, unsigned int bsize, unsigned int cmd_index,
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u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4)
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{
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u32 size;
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int ret;
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if (!fw.chip)
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return -ENOENT;
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if (!fw.chip->cmd_shmem_out_base)
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return -EINVAL;
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if (bsize > fw.chip->shmem_size)
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return -EINVAL;
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if (meson_sm_call(cmd_index, &size, arg0, arg1, arg2, arg3, arg4) < 0)
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return -EINVAL;
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if (size > bsize)
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return -EINVAL;
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ret = size;
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if (!size)
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size = bsize;
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if (buffer)
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memcpy(buffer, fw.sm_shmem_out_base, size);
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return ret;
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}
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EXPORT_SYMBOL(meson_sm_call_read);
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/**
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* meson_sm_call_write - send data to secure-monitor
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*
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* @buffer: Buffer containing data to send
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* @size: Size of the data to send
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* @cmd_index: Index of the SMC32 function ID
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* @arg0: SMC32 Argument 0
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* @arg1: SMC32 Argument 1
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* @arg2: SMC32 Argument 2
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* @arg3: SMC32 Argument 3
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* @arg4: SMC32 Argument 4
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*
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* Return: size of sent data on success, a negative value on error
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*/
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int meson_sm_call_write(void *buffer, unsigned int size, unsigned int cmd_index,
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u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4)
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{
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u32 written;
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if (!fw.chip)
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return -ENOENT;
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if (size > fw.chip->shmem_size)
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return -EINVAL;
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if (!fw.chip->cmd_shmem_in_base)
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return -EINVAL;
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memcpy(fw.sm_shmem_in_base, buffer, size);
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if (meson_sm_call(cmd_index, &written, arg0, arg1, arg2, arg3, arg4) < 0)
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return -EINVAL;
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if (!written)
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return -EINVAL;
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return written;
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}
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EXPORT_SYMBOL(meson_sm_call_write);
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#define SM_CHIP_ID_LENGTH 119
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#define SM_CHIP_ID_OFFSET 4
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#define SM_CHIP_ID_SIZE 12
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static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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uint8_t *id_buf;
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int ret;
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id_buf = kmalloc(SM_CHIP_ID_LENGTH, GFP_KERNEL);
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if (!id_buf)
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return -ENOMEM;
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ret = meson_sm_call_read(id_buf, SM_CHIP_ID_LENGTH, SM_GET_CHIP_ID,
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0, 0, 0, 0, 0);
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if (ret < 0) {
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kfree(id_buf);
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return ret;
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}
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ret = sprintf(buf, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n",
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id_buf[SM_CHIP_ID_OFFSET + 0],
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id_buf[SM_CHIP_ID_OFFSET + 1],
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id_buf[SM_CHIP_ID_OFFSET + 2],
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id_buf[SM_CHIP_ID_OFFSET + 3],
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id_buf[SM_CHIP_ID_OFFSET + 4],
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id_buf[SM_CHIP_ID_OFFSET + 5],
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id_buf[SM_CHIP_ID_OFFSET + 6],
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id_buf[SM_CHIP_ID_OFFSET + 7],
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id_buf[SM_CHIP_ID_OFFSET + 8],
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id_buf[SM_CHIP_ID_OFFSET + 9],
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id_buf[SM_CHIP_ID_OFFSET + 10],
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id_buf[SM_CHIP_ID_OFFSET + 11]);
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kfree(id_buf);
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return ret;
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}
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static DEVICE_ATTR_RO(serial);
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static struct attribute *meson_sm_sysfs_attributes[] = {
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&dev_attr_serial.attr,
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NULL,
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};
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static const struct attribute_group meson_sm_sysfs_attr_group = {
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.attrs = meson_sm_sysfs_attributes,
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};
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static const struct of_device_id meson_sm_ids[] = {
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{ .compatible = "amlogic,meson-gxbb-sm", .data = &gxbb_chip },
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{ /* sentinel */ },
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};
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static int __init meson_sm_probe(struct platform_device *pdev)
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{
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const struct meson_sm_chip *chip;
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chip = of_match_device(meson_sm_ids, &pdev->dev)->data;
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if (chip->cmd_shmem_in_base) {
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fw.sm_shmem_in_base = meson_sm_map_shmem(chip->cmd_shmem_in_base,
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chip->shmem_size);
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if (WARN_ON(!fw.sm_shmem_in_base))
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goto out;
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}
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if (chip->cmd_shmem_out_base) {
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fw.sm_shmem_out_base = meson_sm_map_shmem(chip->cmd_shmem_out_base,
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chip->shmem_size);
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if (WARN_ON(!fw.sm_shmem_out_base))
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goto out_in_base;
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}
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fw.chip = chip;
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pr_info("secure-monitor enabled\n");
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if (sysfs_create_group(&pdev->dev.kobj, &meson_sm_sysfs_attr_group))
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goto out_in_base;
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return 0;
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out_in_base:
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iounmap(fw.sm_shmem_in_base);
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out:
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return -EINVAL;
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}
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static struct platform_driver meson_sm_driver = {
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.driver = {
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.name = "meson-sm",
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.of_match_table = of_match_ptr(meson_sm_ids),
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},
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};
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module_platform_driver_probe(meson_sm_driver, meson_sm_probe);
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