[PATCH v3 2/4] soc: amlogic: meson-gx-socinfo-sm: Add Amlogic secure-monitor SoC Information driver
Viacheslav Bocharov
adeep at lexina.in
Wed Mar 13 23:59:52 PDT 2024
Amlogic SoCs have a SoC information secure-monitor call for SoC type,
package type, revision information and chipid.
This patchs adds support for secure-monitor call decoding and exposing
with the SoC bus infrastructure in addition to the previous SoC
Information driver.
Signed-off-by: Viacheslav Bocharov <adeep at lexina.in>
---
drivers/soc/amlogic/Kconfig | 10 ++
drivers/soc/amlogic/Makefile | 1 +
drivers/soc/amlogic/meson-gx-socinfo-sm.c | 192 ++++++++++++++++++++++
3 files changed, 203 insertions(+)
create mode 100644 drivers/soc/amlogic/meson-gx-socinfo-sm.c
diff --git a/drivers/soc/amlogic/Kconfig b/drivers/soc/amlogic/Kconfig
index d08e398bdad4..82fc77ca3b4b 100644
--- a/drivers/soc/amlogic/Kconfig
+++ b/drivers/soc/amlogic/Kconfig
@@ -26,6 +26,16 @@ config MESON_GX_SOCINFO
Say yes to support decoding of Amlogic Meson GX SoC family
information about the type, package and version.
+config MESON_GX_SOCINFO_SM
+ bool "Amlogic Meson GX SoC Information driver via Secure Monitor"
+ depends on (ARM64 && ARCH_MESON || COMPILE_TEST) && MESON_SM=y
+ default ARCH_MESON && MESON_SM
+ select SOC_BUS
+ help
+ Say yes to support decoding of Amlogic Meson GX SoC family
+ information about the type, package and version via secure
+ monitor call.
+
config MESON_MX_SOCINFO
bool "Amlogic Meson MX SoC Information driver"
depends on (ARM && ARCH_MESON) || COMPILE_TEST
diff --git a/drivers/soc/amlogic/Makefile b/drivers/soc/amlogic/Makefile
index c25f835e6a26..45d9d6f5904c 100644
--- a/drivers/soc/amlogic/Makefile
+++ b/drivers/soc/amlogic/Makefile
@@ -2,4 +2,5 @@
obj-$(CONFIG_MESON_CANVAS) += meson-canvas.o
obj-$(CONFIG_MESON_CLK_MEASURE) += meson-clk-measure.o
obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o
+obj-$(CONFIG_MESON_GX_SOCINFO_SM) += meson-gx-socinfo-sm.o
obj-$(CONFIG_MESON_MX_SOCINFO) += meson-mx-socinfo.o
diff --git a/drivers/soc/amlogic/meson-gx-socinfo-sm.c b/drivers/soc/amlogic/meson-gx-socinfo-sm.c
new file mode 100644
index 000000000000..e30e1d2feb61
--- /dev/null
+++ b/drivers/soc/amlogic/meson-gx-socinfo-sm.c
@@ -0,0 +1,192 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2017 BayLibre, SAS
+ * Copyright (c) 2024 JetHome
+ * Author: Neil Armstrong <neil.armstrong at linaro.org>
+ * Author: Viacheslav Bocharov <adeep at lexina.in>
+ *
+ */
+
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+#include <linux/firmware/meson/meson_sm.h>
+
+#include "meson-gx-socinfo-internal.h"
+
+static char *socinfo_get_chipid(struct device *dev, struct meson_sm_firmware *fw,
+ union meson_cpu_id *socinfo)
+{
+ char *buf;
+ struct meson_sm_chip_id *id_buf;
+ int ret;
+
+ id_buf = devm_kzalloc(dev, sizeof(struct meson_sm_chip_id)+1, GFP_KERNEL);
+ if (!id_buf)
+ return NULL;
+
+ ret = meson_sm_call_read(fw, id_buf, sizeof(struct meson_sm_chip_id), SM_GET_CHIP_ID,
+ 2, 0, 0, 0, 0);
+ if (ret < 0) {
+ kfree(id_buf);
+ return NULL;
+ }
+ dev_info(dev, "got sm version call %i\n", id_buf->version);
+
+ if (id_buf->version != 2) {
+
+ u8 tmp;
+ /**
+ * Legacy 12-byte chip ID read out, transform data
+ * to expected order format
+ */
+ memmove((void *)&id_buf->serial, (void *)&id_buf->cpu_id, 12);
+ for (int i = 0; i < 6; i++) {
+ tmp = id_buf->serial[i];
+ id_buf->serial[i] = id_buf->serial[11 - i];
+ id_buf->serial[11 - i] = tmp;
+ }
+ id_buf->cpu_id.v2.major_id = socinfo->v1.major_id;
+ id_buf->cpu_id.v2.pack_id = socinfo->v1.pack_id;
+ id_buf->cpu_id.v2.chip_rev = socinfo->v1.chip_rev;
+ id_buf->cpu_id.v2.reserved = socinfo->v1.reserved;
+ id_buf->cpu_id.v2.layout_ver = socinfo->v1.layout_ver;
+ } else {
+ /**
+ * rewrite socinfo from regmap with value from secure monitor call
+ */
+ socinfo->v1.major_id = id_buf->cpu_id.v2.major_id;
+ socinfo->v1.pack_id = id_buf->cpu_id.v2.pack_id;
+ socinfo->v1.chip_rev = id_buf->cpu_id.v2.chip_rev;
+ socinfo->v1.reserved = id_buf->cpu_id.v2.reserved;
+ socinfo->v1.layout_ver = id_buf->cpu_id.v2.layout_ver;
+ }
+
+ buf = kasprintf(GFP_KERNEL, "%4phN%12phN", &(id_buf->cpu_id), &(id_buf->serial));
+
+ kfree(id_buf);
+
+ return buf;
+}
+
+static int meson_gx_socinfo_sm_probe(struct platform_device *pdev)
+{
+ struct soc_device_attribute *soc_dev_attr;
+ struct soc_device *soc_dev;
+ struct device_node *sm_np;
+ struct meson_sm_firmware *fw;
+ struct regmap *regmap;
+ union meson_cpu_id socinfo;
+ struct device *dev;
+ int ret;
+
+ /* check if chip-id is available */
+ if (!of_property_read_bool(pdev->dev.of_node, "amlogic,has-chip-id"))
+ return -ENODEV;
+
+ /* node should be a syscon */
+ regmap = syscon_node_to_regmap(pdev->dev.of_node);
+ if (IS_ERR(regmap)) {
+ dev_err(&pdev->dev, "failed to get regmap\n");
+ return -ENODEV;
+ }
+
+ sm_np = of_parse_phandle(pdev->dev.of_node, "secure-monitor", 0);
+ if (!sm_np) {
+ dev_err(&pdev->dev, "no secure-monitor node found\n");
+ return -ENODEV;
+ }
+
+ fw = meson_sm_get(sm_np);
+ of_node_put(sm_np);
+ if (!fw) {
+ dev_info(&pdev->dev, "secure-monitor device not ready, probe later\n");
+ return -EPROBE_DEFER;
+ }
+
+ ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo.raw);
+ if (ret < 0)
+ return ret;
+
+ if (!socinfo.raw) {
+ dev_err(&pdev->dev, "invalid regmap chipid value\n");
+ return -EINVAL;
+ }
+
+ soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
+ GFP_KERNEL);
+ if (!soc_dev_attr)
+ return -ENOMEM;
+
+ soc_dev_attr->serial_number = socinfo_get_chipid(&pdev->dev, fw, &socinfo);
+
+ soc_dev_attr->family = "Amlogic Meson";
+ soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
+ socinfo.v1.major_id,
+ socinfo.v1.chip_rev,
+ socinfo.v1.pack_id,
+ (socinfo.v1.reserved<<4) + socinfo.v1.layout_ver);
+ soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
+ socinfo_v1_to_soc_id(socinfo),
+ socinfo_v1_to_package_id(socinfo));
+
+ soc_dev = soc_device_register(soc_dev_attr);
+
+
+ if (IS_ERR(soc_dev)) {
+ kfree(soc_dev_attr->revision);
+ kfree_const(soc_dev_attr->soc_id);
+ kfree(soc_dev_attr);
+ return PTR_ERR(soc_dev);
+ }
+
+ dev = soc_device_to_device(soc_dev);
+ platform_set_drvdata(pdev, soc_dev);
+
+ dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected (SM)\n",
+ soc_dev_attr->soc_id,
+ socinfo.v1.major_id,
+ socinfo.v1.chip_rev,
+ socinfo.v1.pack_id,
+ (socinfo.v1.reserved<<4) + socinfo.v1.layout_ver);
+
+ return PTR_ERR_OR_ZERO(dev);
+}
+
+
+static int meson_gx_socinfo_sm_remove(struct platform_device *pdev)
+{
+ struct soc_device *soc_dev = platform_get_drvdata(pdev);
+
+ soc_device_unregister(soc_dev);
+ return 0;
+}
+
+static const struct of_device_id meson_gx_socinfo_match[] = {
+ { .compatible = "amlogic,meson-gx-ao-secure", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, meson_gx_socinfo_match);
+
+static struct platform_driver meson_gx_socinfo_driver = {
+ .probe = meson_gx_socinfo_sm_probe,
+ .remove = meson_gx_socinfo_sm_remove,
+ .driver = {
+ .name = "meson-gx-socinfo-sm",
+ .of_match_table = meson_gx_socinfo_match,
+ },
+};
+
+
+module_platform_driver(meson_gx_socinfo_driver);
+
+MODULE_AUTHOR("Viacheslav Bocharov <adeep at lexina.in>");
+MODULE_DESCRIPTION("Amlogic Meson GX SOC SM driver");
+MODULE_LICENSE("GPL");
--
2.43.2
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