mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 02:23:16 +00:00
763dc90e9a
Add driver support for accessing various information reported by Ampere's SMpro co-processor such as Boot Progress and other miscellaneous data. Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com> Link: https://lore.kernel.org/r/20221031024442.2490881-4-quan@os.amperecomputing.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
146 lines
3.2 KiB
C
146 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Ampere Computing SoC's SMpro Misc Driver
|
|
*
|
|
* Copyright (c) 2022, Ampere Computing LLC
|
|
*/
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
|
|
/* Boot Stage/Progress Registers */
|
|
#define BOOTSTAGE 0xB0
|
|
#define BOOTSTAGE_LO 0xB1
|
|
#define CUR_BOOTSTAGE 0xB2
|
|
#define BOOTSTAGE_HI 0xB3
|
|
|
|
/* SOC State Registers */
|
|
#define SOC_POWER_LIMIT 0xE5
|
|
|
|
struct smpro_misc {
|
|
struct regmap *regmap;
|
|
};
|
|
|
|
static ssize_t boot_progress_show(struct device *dev, struct device_attribute *da, char *buf)
|
|
{
|
|
struct smpro_misc *misc = dev_get_drvdata(dev);
|
|
u16 boot_progress[3] = { 0 };
|
|
u32 bootstage;
|
|
u8 boot_stage;
|
|
u8 cur_stage;
|
|
u32 reg_lo;
|
|
u32 reg;
|
|
int ret;
|
|
|
|
/* Read current boot stage */
|
|
ret = regmap_read(misc->regmap, CUR_BOOTSTAGE, ®);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cur_stage = reg & 0xff;
|
|
|
|
ret = regmap_read(misc->regmap, BOOTSTAGE, &bootstage);
|
|
if (ret)
|
|
return ret;
|
|
|
|
boot_stage = (bootstage >> 8) & 0xff;
|
|
|
|
if (boot_stage > cur_stage)
|
|
return -EINVAL;
|
|
|
|
ret = regmap_read(misc->regmap, BOOTSTAGE_LO, ®_lo);
|
|
if (!ret)
|
|
ret = regmap_read(misc->regmap, BOOTSTAGE_HI, ®);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Firmware to report new boot stage next time */
|
|
if (boot_stage < cur_stage) {
|
|
ret = regmap_write(misc->regmap, BOOTSTAGE, ((bootstage & 0xff00) | 0x1));
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
boot_progress[0] = bootstage;
|
|
boot_progress[1] = swab16(reg);
|
|
boot_progress[2] = swab16(reg_lo);
|
|
|
|
return sysfs_emit(buf, "%*phN\n", (int)sizeof(boot_progress), boot_progress);
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(boot_progress);
|
|
|
|
static ssize_t soc_power_limit_show(struct device *dev, struct device_attribute *da, char *buf)
|
|
{
|
|
struct smpro_misc *misc = dev_get_drvdata(dev);
|
|
unsigned int value;
|
|
int ret;
|
|
|
|
ret = regmap_read(misc->regmap, SOC_POWER_LIMIT, &value);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return sysfs_emit(buf, "%d\n", value);
|
|
}
|
|
|
|
static ssize_t soc_power_limit_store(struct device *dev, struct device_attribute *da,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct smpro_misc *misc = dev_get_drvdata(dev);
|
|
unsigned long val;
|
|
s32 ret;
|
|
|
|
ret = kstrtoul(buf, 0, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regmap_write(misc->regmap, SOC_POWER_LIMIT, (unsigned int)val);
|
|
if (ret)
|
|
return -EPROTO;
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR_RW(soc_power_limit);
|
|
|
|
static struct attribute *smpro_misc_attrs[] = {
|
|
&dev_attr_boot_progress.attr,
|
|
&dev_attr_soc_power_limit.attr,
|
|
NULL
|
|
};
|
|
|
|
ATTRIBUTE_GROUPS(smpro_misc);
|
|
|
|
static int smpro_misc_probe(struct platform_device *pdev)
|
|
{
|
|
struct smpro_misc *misc;
|
|
|
|
misc = devm_kzalloc(&pdev->dev, sizeof(struct smpro_misc), GFP_KERNEL);
|
|
if (!misc)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, misc);
|
|
|
|
misc->regmap = dev_get_regmap(pdev->dev.parent, NULL);
|
|
if (!misc->regmap)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver smpro_misc_driver = {
|
|
.probe = smpro_misc_probe,
|
|
.driver = {
|
|
.name = "smpro-misc",
|
|
.dev_groups = smpro_misc_groups,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(smpro_misc_driver);
|
|
|
|
MODULE_AUTHOR("Tung Nguyen <tungnguyen@os.amperecomputing.com>");
|
|
MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>");
|
|
MODULE_DESCRIPTION("Ampere Altra SMpro Misc driver");
|
|
MODULE_LICENSE("GPL");
|