mirror of
https://github.com/torvalds/linux.git
synced 2024-11-25 13:41:51 +00:00
7dbb4a38bf
Add a SoC information driver for Nuvoton WPCM450 SoCs. It provides information such as the SoC revision. Usage example: # grep . /sys/devices/soc0/* /sys/devices/soc0/family:Nuvoton NPCM /sys/devices/soc0/revision:A3 /sys/devices/soc0/soc_id:WPCM450 Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-by: Joel Stanley <joel@jms.id.au> Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de> Link: https://lore.kernel.org/r/20221031223926.241641-1-j.neuschaefer@gmx.net Signed-off-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20230201051717.1005938-1-joel@jms.id.au Signed-off-by: Arnd Bergmann <arnd@arndb.de>
110 lines
2.2 KiB
C
110 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Nuvoton WPCM450 SoC Identification
|
|
*
|
|
* Copyright (C) 2022 Jonathan Neuschäfer
|
|
*/
|
|
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/of.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sys_soc.h>
|
|
|
|
#define GCR_PDID 0
|
|
#define PDID_CHIP(x) ((x) & 0x00ffffff)
|
|
#define CHIP_WPCM450 0x926450
|
|
#define PDID_REV(x) ((x) >> 24)
|
|
|
|
struct revision {
|
|
u8 number;
|
|
const char *name;
|
|
};
|
|
|
|
static const struct revision revisions[] __initconst = {
|
|
{ 0x00, "Z1" },
|
|
{ 0x03, "Z2" },
|
|
{ 0x04, "Z21" },
|
|
{ 0x08, "A1" },
|
|
{ 0x09, "A2" },
|
|
{ 0x0a, "A3" },
|
|
{}
|
|
};
|
|
|
|
static const char * __init get_revision(unsigned int rev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; revisions[i].name; i++)
|
|
if (revisions[i].number == rev)
|
|
return revisions[i].name;
|
|
return NULL;
|
|
}
|
|
|
|
static struct soc_device_attribute *wpcm450_attr;
|
|
static struct soc_device *wpcm450_soc;
|
|
|
|
static int __init wpcm450_soc_init(void)
|
|
{
|
|
struct soc_device_attribute *attr;
|
|
struct soc_device *soc;
|
|
const char *revision;
|
|
struct regmap *gcr;
|
|
u32 pdid;
|
|
int ret;
|
|
|
|
if (!of_machine_is_compatible("nuvoton,wpcm450"))
|
|
return 0;
|
|
|
|
gcr = syscon_regmap_lookup_by_compatible("nuvoton,wpcm450-gcr");
|
|
if (IS_ERR(gcr))
|
|
return PTR_ERR(gcr);
|
|
ret = regmap_read(gcr, GCR_PDID, &pdid);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (PDID_CHIP(pdid) != CHIP_WPCM450) {
|
|
pr_warn("Unknown chip ID in GCR.PDID: 0x%06x\n", PDID_CHIP(pdid));
|
|
return -ENODEV;
|
|
}
|
|
|
|
revision = get_revision(PDID_REV(pdid));
|
|
if (!revision) {
|
|
pr_warn("Unknown chip revision in GCR.PDID: 0x%02x\n", PDID_REV(pdid));
|
|
return -ENODEV;
|
|
}
|
|
|
|
attr = kzalloc(sizeof(*attr), GFP_KERNEL);
|
|
if (!attr)
|
|
return -ENOMEM;
|
|
|
|
attr->family = "Nuvoton NPCM";
|
|
attr->soc_id = "WPCM450";
|
|
attr->revision = revision;
|
|
soc = soc_device_register(attr);
|
|
if (IS_ERR(soc)) {
|
|
kfree(attr);
|
|
pr_warn("Could not register SoC device\n");
|
|
return PTR_ERR(soc);
|
|
}
|
|
|
|
wpcm450_soc = soc;
|
|
wpcm450_attr = attr;
|
|
return 0;
|
|
}
|
|
module_init(wpcm450_soc_init);
|
|
|
|
static void __exit wpcm450_soc_exit(void)
|
|
{
|
|
if (wpcm450_soc) {
|
|
soc_device_unregister(wpcm450_soc);
|
|
wpcm450_soc = NULL;
|
|
kfree(wpcm450_attr);
|
|
}
|
|
}
|
|
module_exit(wpcm450_soc_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Jonathan Neuschäfer");
|
|
MODULE_DESCRIPTION("Nuvoton WPCM450 SoC Identification driver");
|