diff options
Diffstat (limited to 'drivers/soc/amlogic/meson-mx-socinfo.c')
| -rw-r--r-- | drivers/soc/amlogic/meson-mx-socinfo.c | 176 |
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 000000000..92125dd65 --- /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); |