Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Amlogic Secure Monitor driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2016 Endless Mobile, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Author: Carlo Caione <carlo@endlessm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #define pr_fmt(fmt) "meson-sm: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/arm-smccc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/bug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/printk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/sizes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/firmware/meson/meson_sm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) struct meson_sm_cmd {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	unsigned int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	u32 smc_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define CMD(d, s) { .index = (d), .smc_id = (s), }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) struct meson_sm_chip {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	unsigned int shmem_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	u32 cmd_shmem_in_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	u32 cmd_shmem_out_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	struct meson_sm_cmd cmd[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static const struct meson_sm_chip gxbb_chip = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	.shmem_size		= SZ_4K,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	.cmd_shmem_in_base	= 0x82000020,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	.cmd_shmem_out_base	= 0x82000021,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	.cmd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		CMD(SM_EFUSE_READ,	0x82000030),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		CMD(SM_EFUSE_WRITE,	0x82000031),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		CMD(SM_EFUSE_USER_MAX,	0x82000033),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		CMD(SM_GET_CHIP_ID,	0x82000044),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		CMD(SM_A1_PWRC_SET,	0x82000093),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		CMD(SM_A1_PWRC_GET,	0x82000095),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		{ /* sentinel */ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) struct meson_sm_firmware {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	const struct meson_sm_chip *chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	void __iomem *sm_shmem_in_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	void __iomem *sm_shmem_out_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) static u32 meson_sm_get_cmd(const struct meson_sm_chip *chip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 			    unsigned int cmd_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	const struct meson_sm_cmd *cmd = chip->cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	while (cmd->smc_id && cmd->index != cmd_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		cmd++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	return cmd->smc_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) static u32 __meson_sm_call(u32 cmd, u32 arg0, u32 arg1, u32 arg2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			   u32 arg3, u32 arg4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	struct arm_smccc_res res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	arm_smccc_smc(cmd, arg0, arg1, arg2, arg3, arg4, 0, 0, &res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	return res.a0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) static void __iomem *meson_sm_map_shmem(u32 cmd_shmem, unsigned int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	u32 sm_phy_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	sm_phy_base = __meson_sm_call(cmd_shmem, 0, 0, 0, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	if (!sm_phy_base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	return ioremap_cache(sm_phy_base, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  * meson_sm_call - generic SMC32 call to the secure-monitor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93)  * @fw:		Pointer to secure-monitor firmware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94)  * @cmd_index:	Index of the SMC32 function ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95)  * @ret:	Returned value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96)  * @arg0:	SMC32 Argument 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97)  * @arg1:	SMC32 Argument 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98)  * @arg2:	SMC32 Argument 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99)  * @arg3:	SMC32 Argument 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)  * @arg4:	SMC32 Argument 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  * Return:	0 on success, a negative value on error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) int meson_sm_call(struct meson_sm_firmware *fw, unsigned int cmd_index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		  u32 *ret, u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	u32 cmd, lret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	if (!fw->chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	cmd = meson_sm_get_cmd(fw->chip, cmd_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (!cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	lret = __meson_sm_call(cmd, arg0, arg1, arg2, arg3, arg4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		*ret = lret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) EXPORT_SYMBOL(meson_sm_call);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)  * meson_sm_call_read - retrieve data from secure-monitor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)  * @fw:		Pointer to secure-monitor firmware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)  * @buffer:	Buffer to store the retrieved data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)  * @bsize:	Size of the buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)  * @cmd_index:	Index of the SMC32 function ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)  * @arg0:	SMC32 Argument 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)  * @arg1:	SMC32 Argument 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  * @arg2:	SMC32 Argument 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  * @arg3:	SMC32 Argument 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)  * @arg4:	SMC32 Argument 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)  * Return:	size of read data on success, a negative value on error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)  *		When 0 is returned there is no guarantee about the amount of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  *		data read and bsize bytes are copied in buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) int meson_sm_call_read(struct meson_sm_firmware *fw, void *buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		       unsigned int bsize, unsigned int cmd_index, u32 arg0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		       u32 arg1, u32 arg2, u32 arg3, u32 arg4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	u32 size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	if (!fw->chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (!fw->chip->cmd_shmem_out_base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	if (bsize > fw->chip->shmem_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	if (meson_sm_call(fw, cmd_index, &size, arg0, arg1, arg2, arg3, arg4) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	if (size > bsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	ret = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	if (!size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		size = bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	if (buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		memcpy(buffer, fw->sm_shmem_out_base, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) EXPORT_SYMBOL(meson_sm_call_read);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)  * meson_sm_call_write - send data to secure-monitor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)  * @fw:		Pointer to secure-monitor firmware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * @buffer:	Buffer containing data to send
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  * @size:	Size of the data to send
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  * @cmd_index:	Index of the SMC32 function ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)  * @arg0:	SMC32 Argument 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)  * @arg1:	SMC32 Argument 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)  * @arg2:	SMC32 Argument 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)  * @arg3:	SMC32 Argument 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)  * @arg4:	SMC32 Argument 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)  * Return:	size of sent data on success, a negative value on error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) int meson_sm_call_write(struct meson_sm_firmware *fw, void *buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			unsigned int size, unsigned int cmd_index, u32 arg0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 			u32 arg1, u32 arg2, u32 arg3, u32 arg4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	u32 written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (!fw->chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if (size > fw->chip->shmem_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (!fw->chip->cmd_shmem_in_base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	memcpy(fw->sm_shmem_in_base, buffer, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	if (meson_sm_call(fw, cmd_index, &written, arg0, arg1, arg2, arg3, arg4) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	if (!written)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	return written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) EXPORT_SYMBOL(meson_sm_call_write);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)  * meson_sm_get - get pointer to meson_sm_firmware structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)  * @sm_node:		Pointer to the secure-monitor Device Tree node.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)  * Return:		NULL is the secure-monitor device is not ready.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) struct meson_sm_firmware *meson_sm_get(struct device_node *sm_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	struct platform_device *pdev = of_find_device_by_node(sm_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	if (!pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	return platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) EXPORT_SYMBOL_GPL(meson_sm_get);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) #define SM_CHIP_ID_LENGTH	119
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) #define SM_CHIP_ID_OFFSET	4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) #define SM_CHIP_ID_SIZE		12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 			 char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	struct platform_device *pdev = to_platform_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	struct meson_sm_firmware *fw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	uint8_t *id_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	fw = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	id_buf = kmalloc(SM_CHIP_ID_LENGTH, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	if (!id_buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	ret = meson_sm_call_read(fw, id_buf, SM_CHIP_ID_LENGTH, SM_GET_CHIP_ID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 				 0, 0, 0, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		kfree(id_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	ret = sprintf(buf, "%12phN\n", &id_buf[SM_CHIP_ID_OFFSET]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	kfree(id_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) static DEVICE_ATTR_RO(serial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static struct attribute *meson_sm_sysfs_attributes[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	&dev_attr_serial.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) static const struct attribute_group meson_sm_sysfs_attr_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	.attrs = meson_sm_sysfs_attributes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) static const struct of_device_id meson_sm_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	{ .compatible = "amlogic,meson-gxbb-sm", .data = &gxbb_chip },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	{ /* sentinel */ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) static int __init meson_sm_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	const struct meson_sm_chip *chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	struct meson_sm_firmware *fw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	fw = devm_kzalloc(dev, sizeof(*fw), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	if (!fw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	chip = of_match_device(meson_sm_ids, dev)->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	if (chip->cmd_shmem_in_base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		fw->sm_shmem_in_base = meson_sm_map_shmem(chip->cmd_shmem_in_base,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 							  chip->shmem_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		if (WARN_ON(!fw->sm_shmem_in_base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	if (chip->cmd_shmem_out_base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		fw->sm_shmem_out_base = meson_sm_map_shmem(chip->cmd_shmem_out_base,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 							   chip->shmem_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		if (WARN_ON(!fw->sm_shmem_out_base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 			goto out_in_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	fw->chip = chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	platform_set_drvdata(pdev, fw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	pr_info("secure-monitor enabled\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	if (sysfs_create_group(&pdev->dev.kobj, &meson_sm_sysfs_attr_group))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		goto out_in_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) out_in_base:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	iounmap(fw->sm_shmem_in_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) static struct platform_driver meson_sm_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		.name = "meson-sm",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		.of_match_table = of_match_ptr(meson_sm_ids),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) module_platform_driver_probe(meson_sm_driver, meson_sm_probe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) MODULE_LICENSE("GPL v2");