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// SPDX-License-Identifier: GPL-2.0+
/*
* Author: Yinbo Zhu <zhuyinbo@loongson.cn>
* Copyright (C) 2022-2023 Loongson Technology Corporation Limited
*/
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of_fdt.h>
#include <linux/sys_soc.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
static struct soc_device_attribute soc_dev_attr;
static struct soc_device *soc_dev;
/*
* Global Utility Registers.
*
* Not all registers defined in this structure are available on all chips, so
* you are expected to know whether a given register actually exists on your
* chip before you access it.
*
* Also, some registers are similar on different chips but have slightly
* different names. In these cases, one name is chosen to avoid extraneous
* #ifdefs.
*/
struct scfg_guts {
u32 svr; /* Version Register */
u8 res0[4];
u16 feature; /* Feature Register */
u32 vendor; /* Vendor Register */
u8 res1[6];
u32 id;
u8 res2[0x3ff8 - 0x18];
u32 chip;
};
static struct guts {
struct scfg_guts __iomem *regs;
bool little_endian;
} *guts;
struct loongson2_soc_die_attr {
char *die;
u32 svr;
u32 mask;
};
/* SoC die attribute definition for Loongson-2 platform */
static const struct loongson2_soc_die_attr loongson2_soc_die[] = {
/*
* LoongArch-based SoCs Loongson-2 Series
*/
/* Die: 2k1000, SoC: 2k1000 */
{ .die = "2K1000",
.svr = 0x00000013,
.mask = 0x000000ff,
},
{ },
};
static const struct loongson2_soc_die_attr *loongson2_soc_die_match(
u32 svr, const struct loongson2_soc_die_attr *matches)
{
while (matches->svr) {
if (matches->svr == (svr & matches->mask))
return matches;
matches++;
}
return NULL;
}
static u32 loongson2_guts_get_svr(void)
{
u32 svr = 0;
if (!guts || !guts->regs)
return svr;
if (guts->little_endian)
svr = ioread32(&guts->regs->svr);
else
svr = ioread32be(&guts->regs->svr);
return svr;
}
static int loongson2_guts_probe(struct platform_device *pdev)
{
struct device_node *root, *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
const struct loongson2_soc_die_attr *soc_die;
const char *machine;
u32 svr;
/* Initialize guts */
guts = devm_kzalloc(dev, sizeof(*guts), GFP_KERNEL);
if (!guts)
return -ENOMEM;
guts->little_endian = of_property_read_bool(np, "little-endian");
guts->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(guts->regs))
return PTR_ERR(guts->regs);
/* Register soc device */
root = of_find_node_by_path("/");
if (of_property_read_string(root, "model", &machine))
of_property_read_string_index(root, "compatible", 0, &machine);
of_node_put(root);
if (machine)
soc_dev_attr.machine = devm_kstrdup(dev, machine, GFP_KERNEL);
svr = loongson2_guts_get_svr();
soc_die = loongson2_soc_die_match(svr, loongson2_soc_die);
if (soc_die) {
soc_dev_attr.family = devm_kasprintf(dev, GFP_KERNEL,
"Loongson %s", soc_die->die);
} else {
soc_dev_attr.family = devm_kasprintf(dev, GFP_KERNEL, "Loongson");
}
if (!soc_dev_attr.family)
return -ENOMEM;
soc_dev_attr.soc_id = devm_kasprintf(dev, GFP_KERNEL,
"svr:0x%08x", svr);
if (!soc_dev_attr.soc_id)
return -ENOMEM;
soc_dev_attr.revision = devm_kasprintf(dev, GFP_KERNEL, "%d.%d",
(svr >> 4) & 0xf, svr & 0xf);
if (!soc_dev_attr.revision)
return -ENOMEM;
soc_dev = soc_device_register(&soc_dev_attr);
if (IS_ERR(soc_dev))
return PTR_ERR(soc_dev);
pr_info("Machine: %s\n", soc_dev_attr.machine);
pr_info("SoC family: %s\n", soc_dev_attr.family);
pr_info("SoC ID: %s, Revision: %s\n",
soc_dev_attr.soc_id, soc_dev_attr.revision);
return 0;
}
static int loongson2_guts_remove(struct platform_device *dev)
{
soc_device_unregister(soc_dev);
return 0;
}
/*
* Table for matching compatible strings, for device tree
* guts node, for Loongson-2 SoCs.
*/
static const struct of_device_id loongson2_guts_of_match[] = {
{ .compatible = "loongson,ls2k-chipid", },
{}
};
MODULE_DEVICE_TABLE(of, loongson2_guts_of_match);
static struct platform_driver loongson2_guts_driver = {
.driver = {
.name = "loongson2-guts",
.of_match_table = loongson2_guts_of_match,
},
.probe = loongson2_guts_probe,
.remove = loongson2_guts_remove,
};
static int __init loongson2_guts_init(void)
{
return platform_driver_register(&loongson2_guts_driver);
}
core_initcall(loongson2_guts_init);
static void __exit loongson2_guts_exit(void)
{
platform_driver_unregister(&loongson2_guts_driver);
}
module_exit(loongson2_guts_exit);
MODULE_DESCRIPTION("Loongson2 GUTS driver");
MODULE_LICENSE("GPL");
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