From: Carlo Caione <carlo@xxxxxxxxxxxx> 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... Signed-off-by: Carlo Caione <carlo@xxxxxxxxxxxx> --- drivers/firmware/Kconfig | 1 + drivers/firmware/Makefile | 1 + drivers/firmware/meson/Kconfig | 8 + drivers/firmware/meson/Makefile | 1 + drivers/firmware/meson/meson_sm.c | 266 ++++++++++++++++++++++++++++++++ include/linux/firmware/meson/meson_sm.h | 32 ++++ 6 files changed, 309 insertions(+) create mode 100644 drivers/firmware/meson/Kconfig create mode 100644 drivers/firmware/meson/Makefile create mode 100644 drivers/firmware/meson/meson_sm.c create mode 100644 include/linux/firmware/meson/meson_sm.h diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig index 6664f11..686e395 100644 --- a/drivers/firmware/Kconfig +++ b/drivers/firmware/Kconfig @@ -199,5 +199,6 @@ config HAVE_ARM_SMCCC source "drivers/firmware/broadcom/Kconfig" source "drivers/firmware/google/Kconfig" source "drivers/firmware/efi/Kconfig" +source "drivers/firmware/meson/Kconfig" endmenu diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile index 474bada..fc4bb09 100644 --- a/drivers/firmware/Makefile +++ b/drivers/firmware/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_QCOM_SCM_32) += qcom_scm-32.o CFLAGS_qcom_scm-32.o :=$(call as-instr,.arch armv7-a\n.arch_extension sec,-DREQUIRES_SEC=1) -march=armv7-a obj-y += broadcom/ +obj-y += meson/ obj-$(CONFIG_GOOGLE_FIRMWARE) += google/ obj-$(CONFIG_EFI) += efi/ obj-$(CONFIG_UEFI_CPER) += efi/ diff --git a/drivers/firmware/meson/Kconfig b/drivers/firmware/meson/Kconfig new file mode 100644 index 0000000..fff11a3 --- /dev/null +++ b/drivers/firmware/meson/Kconfig @@ -0,0 +1,8 @@ +# +# Amlogic Secure Monitor driver +# +config MESON_SM + bool + default ARCH_MESON + help + Say y here to enable the Amlogic secure monitor driver diff --git a/drivers/firmware/meson/Makefile b/drivers/firmware/meson/Makefile new file mode 100644 index 0000000..9ab3884 --- /dev/null +++ b/drivers/firmware/meson/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_MESON_SM) += meson_sm.o diff --git a/drivers/firmware/meson/meson_sm.c b/drivers/firmware/meson/meson_sm.c new file mode 100644 index 0000000..8e6b9dc --- /dev/null +++ b/drivers/firmware/meson/meson_sm.c @@ -0,0 +1,266 @@ +/* + * Amlogic Secure Monitor driver + * + * Copyright (C) 2016 Endless Mobile, Inc. + * Author: Carlo Caione <carlo@xxxxxxxxxxxx> + * + * 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/>. + */ + +#include <stdarg.h> +#include <asm/cacheflush.h> +#include <asm/compiler.h> +#include <linux/arm-smccc.h> +#include <linux/io.h> +#include <linux/ioport.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/smp.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 = 0x1000, + .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) +{ + unsigned int i; + + for (i = 0; chip->cmd[i].smc_id; i++) + if (chip->cmd[i].index == cmd_index) + return chip->cmd[i].smc_id; + + return 0; +} + +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: Meson secure-monitor firmware pointer + * @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) + return -EINVAL; + + 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: Meson secure-monitor firmware pointer + * @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(struct meson_sm_firmware *fw, void *buffer, + unsigned int cmd_index, u32 arg0, u32 arg1, + u32 arg2, u32 arg3, u32 arg4) +{ + u32 size; + + if (!fw->chip->cmd_shmem_out_base) + return -EINVAL; + + if (meson_sm_call(fw, 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; +} +EXPORT_SYMBOL(meson_sm_call_read); + +/** + * meson_sm_call_write - send data to secure-monitor + * + * @fw: Meson secure-monitor firmware pointer + * @buffer: Buffer containing data to send + * @b_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 b_size, unsigned int cmd_index, + u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4) +{ + u32 size; + + if (b_size > fw->chip->shmem_size) + return -EINVAL; + + if (!fw->chip->cmd_shmem_in_base) + return -EINVAL; + + memcpy(fw->sm_shmem_in_base, buffer, b_size); + + if (meson_sm_call(fw, cmd_index, &size, arg0, arg1, arg2, arg3, arg4) < 0) + return -EINVAL; + + if (!size) + return -EINVAL; + + return size; +} +EXPORT_SYMBOL(meson_sm_call_write); + +/** + * meson_sm_get_fw - get Meson firmware struct + * + * Return: Meson secure-monitor firmware struct on success, NULL on error + */ +struct meson_sm_firmware *meson_sm_get_fw(void) +{ + /* + * Returns NULL is the firmware device is not ready. + */ + if (!fw.chip) + return NULL; + + return &fw; +} +EXPORT_SYMBOL(meson_sm_get_fw); + +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) { + pr_err("no matching node\n"); + return -EINVAL; + } + + chip = matched_np->data; + if (!chip) { + pr_err("unable to setup secure-monitor data\n"); + return -EINVAL; + } + + 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; + } + + fw.chip = chip; + pr_info("secure-monitor enabled\n"); + + return 0; + +out: + if (fw.sm_shmem_in_base) + iounmap(fw.sm_shmem_in_base); + + return -EINVAL; +} +device_initcall(meson_sm_init); diff --git a/include/linux/firmware/meson/meson_sm.h b/include/linux/firmware/meson/meson_sm.h new file mode 100644 index 0000000..81136b0 --- /dev/null +++ b/include/linux/firmware/meson/meson_sm.h @@ -0,0 +1,32 @@ +/* + * Copyright (C) 2016 Endless Mobile, Inc. + * Author: Carlo Caione <carlo@xxxxxxxxxxxx> + * + * 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/>. + */ + +#ifndef _MESON_SM_FW_H_ +#define _MESON_SM_FW_H_ + +#define SM_EFUSE_READ 0 +#define SM_EFUSE_WRITE 1 +#define SM_EFUSE_USER_MAX 2 + +struct meson_sm_firmware; + +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); +int meson_sm_call_write(struct meson_sm_firmware *fw, void *buffer, + unsigned int b_size, unsigned int cmd_index, + u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4); +int meson_sm_call_read(struct meson_sm_firmware *fw, void *buffer, + unsigned int cmd_index, u32 arg0, u32 arg1, + u32 arg2, u32 arg3, u32 arg4); +struct meson_sm_firmware *meson_sm_get_fw(void); + +#endif /* _MESON_SM_FW_H_ */ -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
