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-rw-r--r--drivers/soc/amlogic/meson-mx-socinfo.c176
1 files changed, 176 insertions, 0 deletions
diff --git a/drivers/soc/amlogic/meson-mx-socinfo.c b/drivers/soc/amlogic/meson-mx-socinfo.c
new file mode 100644
index 0000000000..92125dd65f
--- /dev/null
+++ b/drivers/soc/amlogic/meson-mx-socinfo.c
@@ -0,0 +1,176 @@
+/*
+ * Copyright (c) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#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/bitfield.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+#define MESON_SOCINFO_MAJOR_VER_MESON6 0x16
+#define MESON_SOCINFO_MAJOR_VER_MESON8 0x19
+#define MESON_SOCINFO_MAJOR_VER_MESON8B 0x1b
+
+#define MESON_MX_ASSIST_HW_REV 0x14c
+
+#define MESON_MX_ANALOG_TOP_METAL_REVISION 0x0
+
+#define MESON_MX_BOOTROM_MISC_VER 0x4
+
+static const char *meson_mx_socinfo_revision(unsigned int major_ver,
+ unsigned int misc_ver,
+ unsigned int metal_rev)
+{
+ unsigned int minor_ver;
+
+ switch (major_ver) {
+ case MESON_SOCINFO_MAJOR_VER_MESON6:
+ minor_ver = 0xa;
+ break;
+
+ case MESON_SOCINFO_MAJOR_VER_MESON8:
+ if (metal_rev == 0x11111112)
+ major_ver = 0x1d;
+
+ if (metal_rev == 0x11111111 || metal_rev == 0x11111112)
+ minor_ver = 0xa;
+ else if (metal_rev == 0x11111113)
+ minor_ver = 0xb;
+ else if (metal_rev == 0x11111133)
+ minor_ver = 0xc;
+ else
+ minor_ver = 0xd;
+
+ break;
+
+ case MESON_SOCINFO_MAJOR_VER_MESON8B:
+ if (metal_rev == 0x11111111)
+ minor_ver = 0xa;
+ else
+ minor_ver = 0xb;
+
+ break;
+
+ default:
+ minor_ver = 0x0;
+ break;
+ }
+
+ return kasprintf(GFP_KERNEL, "Rev%X (%x - 0:%X)", minor_ver, major_ver,
+ misc_ver);
+}
+
+static const char *meson_mx_socinfo_soc_id(unsigned int major_ver,
+ unsigned int metal_rev)
+{
+ const char *soc_id;
+
+ switch (major_ver) {
+ case MESON_SOCINFO_MAJOR_VER_MESON6:
+ soc_id = "Meson6 (AML8726-MX)";
+ break;
+
+ case MESON_SOCINFO_MAJOR_VER_MESON8:
+ if (metal_rev == 0x11111112)
+ soc_id = "Meson8m2 (S812)";
+ else
+ soc_id = "Meson8 (S802)";
+
+ break;
+
+ case MESON_SOCINFO_MAJOR_VER_MESON8B:
+ soc_id = "Meson8b (S805)";
+ break;
+
+ default:
+ soc_id = "Unknown";
+ break;
+ }
+
+ return kstrdup_const(soc_id, GFP_KERNEL);
+}
+
+static const struct of_device_id meson_mx_socinfo_analog_top_ids[] = {
+ { .compatible = "amlogic,meson8-analog-top", },
+ { .compatible = "amlogic,meson8b-analog-top", },
+ { /* sentinel */ }
+};
+
+static int __init meson_mx_socinfo_init(void)
+{
+ struct soc_device_attribute *soc_dev_attr;
+ struct soc_device *soc_dev;
+ struct device_node *np;
+ struct regmap *assist_regmap, *bootrom_regmap, *analog_top_regmap;
+ unsigned int major_ver, misc_ver, metal_rev = 0;
+ int ret;
+
+ assist_regmap =
+ syscon_regmap_lookup_by_compatible("amlogic,meson-mx-assist");
+ if (IS_ERR(assist_regmap))
+ return PTR_ERR(assist_regmap);
+
+ bootrom_regmap =
+ syscon_regmap_lookup_by_compatible("amlogic,meson-mx-bootrom");
+ if (IS_ERR(bootrom_regmap))
+ return PTR_ERR(bootrom_regmap);
+
+ np = of_find_matching_node(NULL, meson_mx_socinfo_analog_top_ids);
+ if (np) {
+ analog_top_regmap = syscon_node_to_regmap(np);
+ of_node_put(np);
+ if (IS_ERR(analog_top_regmap))
+ return PTR_ERR(analog_top_regmap);
+
+ ret = regmap_read(analog_top_regmap,
+ MESON_MX_ANALOG_TOP_METAL_REVISION,
+ &metal_rev);
+ if (ret)
+ return ret;
+ }
+
+ ret = regmap_read(assist_regmap, MESON_MX_ASSIST_HW_REV, &major_ver);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_read(bootrom_regmap, MESON_MX_BOOTROM_MISC_VER,
+ &misc_ver);
+ if (ret < 0)
+ return ret;
+
+ soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+ if (!soc_dev_attr)
+ return -ENODEV;
+
+ soc_dev_attr->family = "Amlogic Meson";
+
+ np = of_find_node_by_path("/");
+ of_property_read_string(np, "model", &soc_dev_attr->machine);
+ of_node_put(np);
+
+ soc_dev_attr->revision = meson_mx_socinfo_revision(major_ver, misc_ver,
+ metal_rev);
+ soc_dev_attr->soc_id = meson_mx_socinfo_soc_id(major_ver, metal_rev);
+
+ soc_dev = soc_device_register(soc_dev_attr);
+ if (IS_ERR(soc_dev)) {
+ kfree_const(soc_dev_attr->revision);
+ kfree_const(soc_dev_attr->soc_id);
+ kfree(soc_dev_attr);
+ return PTR_ERR(soc_dev);
+ }
+
+ dev_info(soc_device_to_device(soc_dev), "Amlogic %s %s detected\n",
+ soc_dev_attr->soc_id, soc_dev_attr->revision);
+
+ return 0;
+}
+device_initcall(meson_mx_socinfo_init);