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 | 179 ++++++++++++++++++++++++++++++++ include/linux/firmware/meson/meson_sm.h | 38 +++++++ 6 files changed, 228 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..445bc7f --- /dev/null +++ b/drivers/firmware/meson/meson_sm.c @@ -0,0 +1,179 @@ +/* + * 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/smp.h> + +#include <linux/firmware/meson/meson_sm.h> + +#define SM_MEM_SIZE 0x1000 + +struct meson_sm_data { + u32 cmd; + u32 arg0; + u32 arg1; + u32 arg2; + u32 arg3; + u32 arg4; + u32 ret; +}; + +static void __meson_sm_call(void *info) +{ + struct meson_sm_data *data = info; + struct arm_smccc_res res; + + arm_smccc_smc(data->cmd, + data->arg0, data->arg1, data->arg2, + data->arg3, data->arg4, 0, 0, &res); + data->ret = res.a0; +} + +u32 meson_sm_call(u32 cmd, u32 arg0, u32 arg1, u32 arg2, + u32 arg3, u32 arg4) +{ + struct meson_sm_data data; + + data.cmd = cmd; + data.arg0 = arg0; + data.arg1 = arg1; + data.arg2 = arg2; + data.arg3 = arg3; + data.arg4 = arg4; + data.ret = 0; + + __meson_sm_call(&data); + + return data.ret; +} +EXPORT_SYMBOL(meson_sm_call); + +u32 meson_sm_call_read(struct meson_sm_firmware *fw, void *buffer, + u32 cmd, u32 arg0, u32 arg1, u32 arg2, + u32 arg3, u32 arg4) +{ + u32 size; + + if (!fw) + return -EINVAL; + + size = meson_sm_call(cmd, arg0, arg1, arg2, arg3, arg4); + + if (!size || size > SM_MEM_SIZE) + return -EINVAL; + + memcpy(buffer, fw->sm_sharemem_out_base, size); + return size; +} +EXPORT_SYMBOL(meson_sm_call_read); + +u32 meson_sm_call_write(struct meson_sm_firmware *fw, void *buffer, + unsigned int b_size, u32 cmd, u32 arg0, + u32 arg1, u32 arg2, u32 arg3, u32 arg4) +{ + u32 size; + + if (!fw) + return -EINVAL; + + if (b_size > SM_MEM_SIZE) + return -EINVAL; + + memcpy(fw->sm_sharemem_in_base, buffer, b_size); + + size = meson_sm_call(cmd, arg0, arg1, arg2, arg3, arg4); + + if (!size) + return -EINVAL; + + return size; +} +EXPORT_SYMBOL(meson_sm_call_write); + +static int meson_sm_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct meson_sm_firmware *fw; + u32 sm_phy_in_base, sm_phy_out_base; + int cmd_in, cmd_out; + + fw = devm_kzalloc(&pdev->dev, sizeof(*fw), GFP_KERNEL); + if (!fw) + return -ENOMEM; + + fw->dev = &pdev->dev; + + if (of_property_read_u32(np, "amlogic,sm-cmd-input-base", &cmd_in)) + return -EINVAL; + + if (of_property_read_u32(np, "amlogic,sm-cmd-output-base", &cmd_out)) + return -EINVAL; + + sm_phy_in_base = meson_sm_call(cmd_in, 0, 0, 0, 0, 0); + fw->sm_sharemem_in_base = ioremap_cache(sm_phy_in_base, SM_MEM_SIZE); + if (!fw->sm_sharemem_in_base) + return -EINVAL; + + sm_phy_out_base = meson_sm_call(cmd_out, 0, 0, 0, 0, 0); + fw->sm_sharemem_out_base = ioremap_cache(sm_phy_out_base, SM_MEM_SIZE); + if (!fw->sm_sharemem_out_base) { + iounmap(fw->sm_sharemem_in_base); + return -EINVAL; + } + + platform_set_drvdata(pdev, fw); + + return 0; +} + +struct meson_sm_firmware *meson_sm_get_fw(struct device_node *firmware_node) +{ + struct platform_device *pdev = of_find_device_by_node(firmware_node); + + /* + * Returns NULL is the firmware device is not ready. + */ + if (!pdev) + return NULL; + + return platform_get_drvdata(pdev); +} +EXPORT_SYMBOL(meson_sm_get_fw); + +static const struct of_device_id meson_sm_ids[] = { + { .compatible = "amlogic,meson-sm" }, + { /* sentinel */}, +}; +MODULE_DEVICE_TABLE(of, meson_sm_ids); + +static struct platform_driver meson_sm_platform_driver = { + .probe = meson_sm_probe, + .driver = { + .name = "secmon", + .of_match_table = meson_sm_ids, + }, +}; +module_platform_driver(meson_sm_platform_driver); + +MODULE_AUTHOR("Carlo Caione <carlo@xxxxxxxxxxxx>"); +MODULE_DESCRIPTION("Amlogic secure monitor driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/firmware/meson/meson_sm.h b/include/linux/firmware/meson/meson_sm.h new file mode 100644 index 0000000..7b6b524 --- /dev/null +++ b/include/linux/firmware/meson/meson_sm.h @@ -0,0 +1,38 @@ +/* + * 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_H_ +#define _MESON_SM_H_ + +#include <linux/types.h> +#include <linux/of_device.h> + +struct meson_sm_firmware { + struct device *dev; + void __iomem *sm_sharemem_in_base; + void __iomem *sm_sharemem_out_base; +}; + +u32 meson_sm_call(u32 cmd, u32 arg0, u32 arg1, u32 arg2, + u32 arg3, u32 arg4); + +u32 meson_sm_call_write(struct meson_sm_firmware *fw, void *buffer, + unsigned int b_size, u32 cmd, u32 arg0, + u32 arg1, u32 arg2, u32 arg3, u32 arg4); + +u32 meson_sm_call_read(struct meson_sm_firmware *fw, void *buffer, + u32 cmd, u32 arg0, u32 arg1, u32 arg2, + u32 arg3, u32 arg4); + +struct meson_sm_firmware *meson_sm_get_fw(struct device_node *firmware_node); + +#endif /* _MESON_SM_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
