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-rw-r--r--drivers/firmware/meson/Kconfig10
-rw-r--r--drivers/firmware/meson/Makefile2
-rw-r--r--drivers/firmware/meson/meson_sm.c338
3 files changed, 350 insertions, 0 deletions
diff --git a/drivers/firmware/meson/Kconfig b/drivers/firmware/meson/Kconfig
new file mode 100644
index 000000000..2671dcd0a
--- /dev/null
+++ b/drivers/firmware/meson/Kconfig
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Amlogic Secure Monitor driver
+#
+config MESON_SM
+ bool
+ default ARCH_MESON
+ depends on ARM64_4K_PAGES
+ 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 000000000..c6c09483b
--- /dev/null
+++ b/drivers/firmware/meson/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+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 000000000..7dff88331
--- /dev/null
+++ b/drivers/firmware/meson/meson_sm.c
@@ -0,0 +1,338 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Amlogic Secure Monitor driver
+ *
+ * Copyright (C) 2016 Endless Mobile, Inc.
+ * Author: Carlo Caione <carlo@endlessm.com>
+ */
+
+#define pr_fmt(fmt) "meson-sm: " fmt
+
+#include <linux/arm-smccc.h>
+#include <linux/bug.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/printk.h>
+#include <linux/types.h>
+#include <linux/sizes.h>
+ #include <linux/slab.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[];
+};
+
+static const struct meson_sm_chip gxbb_chip = {
+ .shmem_size = SZ_4K,
+ .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),
+ CMD(SM_GET_CHIP_ID, 0x82000044),
+ CMD(SM_A1_PWRC_SET, 0x82000093),
+ CMD(SM_A1_PWRC_GET, 0x82000095),
+ { /* sentinel */ },
+ },
+};
+
+struct meson_sm_firmware {
+ const struct meson_sm_chip *chip;
+ void __iomem *sm_shmem_in_base;
+ void __iomem *sm_shmem_out_base;
+};
+
+static u32 meson_sm_get_cmd(const struct meson_sm_chip *chip,
+ unsigned int cmd_index)
+{
+ const struct meson_sm_cmd *cmd = chip->cmd;
+
+ while (cmd->smc_id && cmd->index != cmd_index)
+ cmd++;
+
+ return cmd->smc_id;
+}
+
+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: Pointer to secure-monitor firmware
+ * @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->chip)
+ return -ENOENT;
+
+ 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: Pointer to secure-monitor firmware
+ * @buffer: Buffer to store the retrieved data
+ * @bsize: Size of the buffer
+ * @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
+ * When 0 is returned there is no guarantee about the amount of
+ * data read and bsize bytes are copied in buffer.
+ */
+int meson_sm_call_read(struct meson_sm_firmware *fw, void *buffer,
+ unsigned int bsize, unsigned int cmd_index, u32 arg0,
+ u32 arg1, u32 arg2, u32 arg3, u32 arg4)
+{
+ u32 size;
+ int ret;
+
+ if (!fw->chip)
+ return -ENOENT;
+
+ if (!fw->chip->cmd_shmem_out_base)
+ return -EINVAL;
+
+ if (bsize > fw->chip->shmem_size)
+ return -EINVAL;
+
+ if (meson_sm_call(fw, cmd_index, &size, arg0, arg1, arg2, arg3, arg4) < 0)
+ return -EINVAL;
+
+ if (size > bsize)
+ return -EINVAL;
+
+ ret = size;
+
+ if (!size)
+ size = bsize;
+
+ if (buffer)
+ memcpy(buffer, fw->sm_shmem_out_base, size);
+
+ return ret;
+}
+EXPORT_SYMBOL(meson_sm_call_read);
+
+/**
+ * meson_sm_call_write - send data to secure-monitor
+ *
+ * @fw: Pointer to secure-monitor firmware
+ * @buffer: Buffer containing data to send
+ * @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 size, unsigned int cmd_index, u32 arg0,
+ u32 arg1, u32 arg2, u32 arg3, u32 arg4)
+{
+ u32 written;
+
+ if (!fw->chip)
+ return -ENOENT;
+
+ if (size > fw->chip->shmem_size)
+ return -EINVAL;
+
+ if (!fw->chip->cmd_shmem_in_base)
+ return -EINVAL;
+
+ memcpy(fw->sm_shmem_in_base, buffer, size);
+
+ if (meson_sm_call(fw, cmd_index, &written, arg0, arg1, arg2, arg3, arg4) < 0)
+ return -EINVAL;
+
+ if (!written)
+ return -EINVAL;
+
+ return written;
+}
+EXPORT_SYMBOL(meson_sm_call_write);
+
+/**
+ * meson_sm_get - get pointer to meson_sm_firmware structure.
+ *
+ * @sm_node: Pointer to the secure-monitor Device Tree node.
+ *
+ * Return: NULL is the secure-monitor device is not ready.
+ */
+struct meson_sm_firmware *meson_sm_get(struct device_node *sm_node)
+{
+ struct platform_device *pdev = of_find_device_by_node(sm_node);
+
+ if (!pdev)
+ return NULL;
+
+ return platform_get_drvdata(pdev);
+}
+EXPORT_SYMBOL_GPL(meson_sm_get);
+
+#define SM_CHIP_ID_LENGTH 119
+#define SM_CHIP_ID_OFFSET 4
+#define SM_CHIP_ID_SIZE 12
+
+static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct meson_sm_firmware *fw;
+ uint8_t *id_buf;
+ int ret;
+
+ fw = platform_get_drvdata(pdev);
+
+ id_buf = kmalloc(SM_CHIP_ID_LENGTH, GFP_KERNEL);
+ if (!id_buf)
+ return -ENOMEM;
+
+ ret = meson_sm_call_read(fw, id_buf, SM_CHIP_ID_LENGTH, SM_GET_CHIP_ID,
+ 0, 0, 0, 0, 0);
+ if (ret < 0) {
+ kfree(id_buf);
+ return ret;
+ }
+
+ ret = sprintf(buf, "%12phN\n", &id_buf[SM_CHIP_ID_OFFSET]);
+
+ kfree(id_buf);
+
+ return ret;
+}
+
+static DEVICE_ATTR_RO(serial);
+
+static struct attribute *meson_sm_sysfs_attributes[] = {
+ &dev_attr_serial.attr,
+ NULL,
+};
+
+static const struct attribute_group meson_sm_sysfs_attr_group = {
+ .attrs = meson_sm_sysfs_attributes,
+};
+
+static const struct of_device_id meson_sm_ids[] = {
+ { .compatible = "amlogic,meson-gxbb-sm", .data = &gxbb_chip },
+ { /* sentinel */ },
+};
+
+static int __init meson_sm_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ const struct meson_sm_chip *chip;
+ struct meson_sm_firmware *fw;
+
+ fw = devm_kzalloc(dev, sizeof(*fw), GFP_KERNEL);
+ if (!fw)
+ return -ENOMEM;
+
+ chip = of_match_device(meson_sm_ids, dev)->data;
+ if (!chip)
+ 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_in_base;
+ }
+
+ fw->chip = chip;
+
+ platform_set_drvdata(pdev, fw);
+
+ if (devm_of_platform_populate(dev))
+ goto out_in_base;
+
+ if (sysfs_create_group(&pdev->dev.kobj, &meson_sm_sysfs_attr_group))
+ goto out_in_base;
+
+ pr_info("secure-monitor enabled\n");
+
+ return 0;
+
+out_in_base:
+ iounmap(fw->sm_shmem_in_base);
+out:
+ return -EINVAL;
+}
+
+static struct platform_driver meson_sm_driver = {
+ .driver = {
+ .name = "meson-sm",
+ .of_match_table = of_match_ptr(meson_sm_ids),
+ },
+};
+module_platform_driver_probe(meson_sm_driver, meson_sm_probe);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 22:39:49 +0000