178 lines
4.0 KiB
C
Executable File
178 lines
4.0 KiB
C
Executable File
/*
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* Copyright (c) 2017 BayLibre, SAS
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* Author: Neil Armstrong <narmstrong@baylibre.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 AO_SEC_SD_CFG8 0xe0
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#define AO_SEC_SOCINFO_OFFSET AO_SEC_SD_CFG8
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#define SOCINFO_MAJOR GENMASK(31, 24)
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#define SOCINFO_PACK GENMASK(23, 16)
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#define SOCINFO_MINOR GENMASK(15, 8)
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#define SOCINFO_MISC GENMASK(7, 0)
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static const struct meson_gx_soc_id {
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const char *name;
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unsigned int id;
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} soc_ids[] = {
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{ "GXBB", 0x1f },
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{ "GXTVBB", 0x20 },
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{ "GXL", 0x21 },
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{ "GXM", 0x22 },
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{ "TXL", 0x23 },
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};
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static const struct meson_gx_package_id {
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const char *name;
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unsigned int major_id;
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unsigned int pack_id;
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} soc_packages[] = {
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{ "S905", 0x1f, 0 },
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{ "S905M", 0x1f, 0x20 },
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{ "S905D", 0x21, 0 },
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{ "S905X", 0x21, 0x80 },
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{ "S905L", 0x21, 0xc0 },
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{ "S905M2", 0x21, 0xe0 },
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{ "S912", 0x22, 0 },
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};
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static inline unsigned int socinfo_to_major(u32 socinfo)
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{
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return FIELD_GET(SOCINFO_MAJOR, socinfo);
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}
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static inline unsigned int socinfo_to_minor(u32 socinfo)
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{
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return FIELD_GET(SOCINFO_MINOR, socinfo);
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}
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static inline unsigned int socinfo_to_pack(u32 socinfo)
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{
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return FIELD_GET(SOCINFO_PACK, socinfo);
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}
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static inline unsigned int socinfo_to_misc(u32 socinfo)
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{
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return FIELD_GET(SOCINFO_MISC, socinfo);
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}
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static const char *socinfo_to_package_id(u32 socinfo)
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{
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unsigned int pack = socinfo_to_pack(socinfo) & 0xf0;
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unsigned int major = socinfo_to_major(socinfo);
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int i;
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for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
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if (soc_packages[i].major_id == major &&
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soc_packages[i].pack_id == pack)
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return soc_packages[i].name;
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}
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return "Unknown";
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}
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static const char *socinfo_to_soc_id(u32 socinfo)
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{
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unsigned int id = socinfo_to_major(socinfo);
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int i;
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for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
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if (soc_ids[i].id == id)
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return soc_ids[i].name;
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}
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return "Unknown";
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}
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int __init meson_gx_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 *regmap;
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unsigned int socinfo;
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struct device *dev;
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int ret;
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/* look up for chipid node */
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np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
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if (!np)
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return -ENODEV;
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/* check if interface is enabled */
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if (!of_device_is_available(np))
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return -ENODEV;
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/* check if chip-id is available */
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if (!of_property_read_bool(np, "amlogic,has-chip-id"))
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return -ENODEV;
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/* node should be a syscon */
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regmap = syscon_node_to_regmap(np);
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of_node_put(np);
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if (IS_ERR(regmap)) {
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pr_err("%s: failed to get regmap\n", __func__);
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return -ENODEV;
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}
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ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
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if (ret < 0)
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return ret;
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if (!socinfo) {
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pr_err("%s: invalid chipid value\n", __func__);
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return -EINVAL;
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}
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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 = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
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socinfo_to_major(socinfo),
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socinfo_to_minor(socinfo),
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socinfo_to_pack(socinfo),
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socinfo_to_misc(socinfo));
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soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
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socinfo_to_soc_id(socinfo),
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socinfo_to_package_id(socinfo));
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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(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 = soc_device_to_device(soc_dev);
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dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
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soc_dev_attr->soc_id,
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socinfo_to_major(socinfo),
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socinfo_to_minor(socinfo),
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socinfo_to_pack(socinfo),
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socinfo_to_misc(socinfo));
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return 0;
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}
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device_initcall(meson_gx_socinfo_init);
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