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Release 4.11 drivers/firmware/meson/meson_sm.c

/*
 * 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; }

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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; }

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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); }

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/** * 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; }

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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; }

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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; }

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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; }

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device_initcall(meson_sm_init);

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