Orange Pi5 kernel

 // 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);
MODULE_LICENSE("GPL v2");

	// 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);
	MODULE_LICENSE("GPL v2");