Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

3 files changed, 269 insertions, 0 deletions

diff --git a/drivers/firmware/meson/Kconfig b/drivers/firmware/meson/Kconfig
new file mode 100644
index 000000000..170d7e8bc
--- /dev/null
+++ b/drivers/firmware/meson/Kconfig
@@ -0,0 +1,9 @@
+#
+# 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..9ab3884f9
--- /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 000000000..0ec2ca873
--- /dev/null
+++ b/drivers/firmware/meson/meson_sm.c
@@ -0,0 +1,259 @@
+/*
+ * 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/>.
+ */
+
+#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/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		= 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),
+		{ /* 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)
+{
+	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
+ *
+ * @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(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
+ *
+ * @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(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(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
+ *
+ * @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(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(cmd_index, &written, arg0, arg1, arg2, arg3, arg4) < 0)
+		return -EINVAL;
+
+	if (!written)
+		return -EINVAL;
+
+	return written;
+}
+EXPORT_SYMBOL(meson_sm_call_write);
+
+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)
+{
+	const struct meson_sm_chip *chip;
+
+	chip = of_match_device(meson_sm_ids, &pdev->dev)->data;
+
+	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;
+	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);