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334 lines
7.4 KiB
334 lines
7.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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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static const 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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CMD(SM_A1_PWRC_SET, 0x82000093), |
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CMD(SM_A1_PWRC_GET, 0x82000095), |
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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 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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* @fw: Pointer to secure-monitor firmware |
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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(struct meson_sm_firmware *fw, unsigned int cmd_index, |
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u32 *ret, u32 arg0, 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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* @fw: Pointer to secure-monitor firmware |
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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(struct meson_sm_firmware *fw, void *buffer, |
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unsigned int bsize, unsigned int cmd_index, u32 arg0, |
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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(fw, 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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* @fw: Pointer to secure-monitor firmware |
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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(struct meson_sm_firmware *fw, void *buffer, |
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unsigned int size, unsigned int cmd_index, u32 arg0, |
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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(fw, 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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/** |
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* meson_sm_get - get pointer to meson_sm_firmware structure. |
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* |
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* @sm_node: Pointer to the secure-monitor Device Tree node. |
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* |
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* Return: NULL is the secure-monitor device is not ready. |
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*/ |
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struct meson_sm_firmware *meson_sm_get(struct device_node *sm_node) |
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{ |
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struct platform_device *pdev = of_find_device_by_node(sm_node); |
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if (!pdev) |
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return NULL; |
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return platform_get_drvdata(pdev); |
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} |
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EXPORT_SYMBOL_GPL(meson_sm_get); |
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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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struct platform_device *pdev = to_platform_device(dev); |
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struct meson_sm_firmware *fw; |
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uint8_t *id_buf; |
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int ret; |
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fw = platform_get_drvdata(pdev); |
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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(fw, 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, "%12phN\n", &id_buf[SM_CHIP_ID_OFFSET]); |
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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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struct device *dev = &pdev->dev; |
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const struct meson_sm_chip *chip; |
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struct meson_sm_firmware *fw; |
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fw = devm_kzalloc(dev, sizeof(*fw), GFP_KERNEL); |
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if (!fw) |
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return -ENOMEM; |
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chip = of_match_device(meson_sm_ids, 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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platform_set_drvdata(pdev, fw); |
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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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MODULE_LICENSE("GPL v2");
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