firmware: Amlogic: Add secure monitor driver
Introduce a driver to provide calls into secure monitor mode. In the Amlogic SoCs these calls are used for multiple reasons: access to NVMEM, set USB boot, enable JTAG, etc... Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Carlo Caione <carlo@endlessm.com> [khilman: add in SZ_4K cleanup] Signed-off-by: Kevin Hilman <khilman@baylibre.com>
This commit is contained in:
Carlo Caione
Kevin Hilman
parent
6edf27ee25
commit
2c4ddb2155
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@ -209,5 +209,6 @@ config HAVE_ARM_SMCCC
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source "drivers/firmware/broadcom/Kconfig"
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source "drivers/firmware/google/Kconfig"
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source "drivers/firmware/efi/Kconfig"
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source "drivers/firmware/meson/Kconfig"
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endmenu
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@ -22,6 +22,7 @@ obj-$(CONFIG_QCOM_SCM_32) += qcom_scm-32.o
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CFLAGS_qcom_scm-32.o :=$(call as-instr,.arch armv7-a\n.arch_extension sec,-DREQUIRES_SEC=1) -march=armv7-a
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obj-y += broadcom/
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obj-y += meson/
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obj-$(CONFIG_GOOGLE_FIRMWARE) += google/
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obj-$(CONFIG_EFI) += efi/
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obj-$(CONFIG_UEFI_CPER) += efi/
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@ -0,0 +1,9 @@
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#
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# Amlogic Secure Monitor driver
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#
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config MESON_SM
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bool
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default ARCH_MESON
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depends on ARM64_4K_PAGES
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help
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Say y here to enable the Amlogic secure monitor driver
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@ -0,0 +1 @@
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obj-$(CONFIG_MESON_SM) += meson_sm.o
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@ -0,0 +1,248 @@
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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 <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/of.h>
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#include <linux/of_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/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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{ /* 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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* @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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*/
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int meson_sm_call_read(void *buffer, 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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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 (meson_sm_call(cmd_index, &size, arg0, arg1, arg2, arg3, arg4) < 0)
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return -EINVAL;
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if (!size || size > fw.chip->shmem_size)
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return -EINVAL;
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if (buffer)
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memcpy(buffer, fw.sm_shmem_out_base, size);
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return size;
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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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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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int __init meson_sm_init(void)
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{
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const struct meson_sm_chip *chip;
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const struct of_device_id *matched_np;
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struct device_node *np;
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np = of_find_matching_node_and_match(NULL, meson_sm_ids, &matched_np);
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if (!np)
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return -ENODEV;
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chip = matched_np->data;
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if (!chip) {
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pr_err("unable to setup secure-monitor data\n");
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goto out;
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}
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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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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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device_initcall(meson_sm_init);
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@ -0,0 +1,31 @@
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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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#ifndef _MESON_SM_FW_H_
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#define _MESON_SM_FW_H_
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enum {
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SM_EFUSE_READ,
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SM_EFUSE_WRITE,
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SM_EFUSE_USER_MAX,
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};
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struct meson_sm_firmware;
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int meson_sm_call(unsigned int cmd_index, u32 *ret, u32 arg0, u32 arg1,
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u32 arg2, u32 arg3, u32 arg4);
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int meson_sm_call_write(void *buffer, unsigned int b_size, unsigned int cmd_index,
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u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4);
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int meson_sm_call_read(void *buffer, unsigned int cmd_index, u32 arg0, u32 arg1,
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u32 arg2, u32 arg3, u32 arg4);
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#endif /* _MESON_SM_FW_H_ */
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