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