@@ -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
@@ -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-$(CONFIG_UEFI_CPER) += efi/
new file mode 100644
@@ -0,0 +1,8 @@
+#
+# Amlogic Secure Monitor driver
+#
+config MESON_SM
+ bool
+ default ARCH_MESON
+ help
+ Say y here to enable the Amlogic secure monitor driver
new file mode 100644
@@ -0,0 +1 @@
+obj-$(CONFIG_MESON_SM) += meson_sm.o
new file mode 100644
@@ -0,0 +1,283 @@
+/*
+ * 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/>.
+ */
+
+#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_firmware {
+ struct device *dev;
+ const struct meson_sm_chip *chip;
+ void __iomem *sm_shmem_in_base;
+ void __iomem *sm_shmem_out_base;
+};
+
+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 */ },
+ },
+};
+
+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);
+
+static int meson_sm_probe(struct platform_device *pdev)
+{
+ const struct meson_sm_chip *chip;
+ struct meson_sm_firmware *fw;
+
+ fw = devm_kzalloc(&pdev->dev, sizeof(*fw), GFP_KERNEL);
+ if (!fw)
+ return -ENOMEM;
+
+ fw->dev = &pdev->dev;
+
+ chip = of_device_get_match_data(fw->dev);
+ if (!chip) {
+ dev_err(fw->dev, "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;
+ platform_set_drvdata(pdev, fw);
+
+ dev_info(fw->dev, "secure-monitor enabled\n");
+
+ return 0;
+
+out:
+ if (fw->sm_shmem_in_base)
+ iounmap(fw->sm_shmem_in_base);
+
+ return -EINVAL;
+}
+
+/**
+ * meson_sm_get_fw - get Meson firmware struct
+ *
+ * @firmware_node: Device node of the secure-monitor
+ *
+ * Return: Meson secure-monitor firmware struct on success, NULL on error
+ */
+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-gxbb-sm", .data = &gxbb_chip },
+ { /* sentinel */},
+};
+MODULE_DEVICE_TABLE(of, meson_sm_ids);
+
+static struct platform_driver meson_sm_platform_driver = {
+ .probe = meson_sm_probe,
+ .driver = {
+ .name = "secure-monitor",
+ .of_match_table = meson_sm_ids,
+ },
+};
+module_platform_driver(meson_sm_platform_driver);
+
+MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>");
+MODULE_DESCRIPTION("Amlogic secure monitor driver");
+MODULE_LICENSE("GPL");
new file mode 100644
@@ -0,0 +1,32 @@
+/*
+ * 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/>.
+ */
+
+#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(struct device_node *firmware_node);
+
+#endif /* _MESON_SM_FW_H_ */