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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>
145 lines
3.2 KiB
C
145 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Ampere Computing SoC's SMpro Misc Driver
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*
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* Copyright (c) 2022, Ampere Computing LLC
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*/
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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/* Boot Stage/Progress Registers */
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#define BOOTSTAGE 0xB0
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#define BOOTSTAGE_LO 0xB1
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#define CUR_BOOTSTAGE 0xB2
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#define BOOTSTAGE_HI 0xB3
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/* SOC State Registers */
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#define SOC_POWER_LIMIT 0xE5
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struct smpro_misc {
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struct regmap *regmap;
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};
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static ssize_t boot_progress_show(struct device *dev, struct device_attribute *da, char *buf)
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{
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struct smpro_misc *misc = dev_get_drvdata(dev);
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u16 boot_progress[3] = { 0 };
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u32 bootstage;
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u8 boot_stage;
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u8 cur_stage;
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u32 reg_lo;
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u32 reg;
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int ret;
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/* Read current boot stage */
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ret = regmap_read(misc->regmap, CUR_BOOTSTAGE, ®);
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if (ret)
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return ret;
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cur_stage = reg & 0xff;
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ret = regmap_read(misc->regmap, BOOTSTAGE, &bootstage);
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if (ret)
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return ret;
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boot_stage = (bootstage >> 8) & 0xff;
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if (boot_stage > cur_stage)
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return -EINVAL;
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ret = regmap_read(misc->regmap, BOOTSTAGE_LO, ®_lo);
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if (!ret)
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ret = regmap_read(misc->regmap, BOOTSTAGE_HI, ®);
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if (ret)
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return ret;
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/* Firmware to report new boot stage next time */
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if (boot_stage < cur_stage) {
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ret = regmap_write(misc->regmap, BOOTSTAGE, ((bootstage & 0xff00) | 0x1));
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if (ret)
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return ret;
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}
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boot_progress[0] = bootstage;
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boot_progress[1] = swab16(reg);
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boot_progress[2] = swab16(reg_lo);
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return sysfs_emit(buf, "%*phN\n", (int)sizeof(boot_progress), boot_progress);
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}
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static DEVICE_ATTR_RO(boot_progress);
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static ssize_t soc_power_limit_show(struct device *dev, struct device_attribute *da, char *buf)
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{
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struct smpro_misc *misc = dev_get_drvdata(dev);
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unsigned int value;
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int ret;
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ret = regmap_read(misc->regmap, SOC_POWER_LIMIT, &value);
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if (ret)
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return ret;
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return sysfs_emit(buf, "%d\n", value);
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}
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static ssize_t soc_power_limit_store(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct smpro_misc *misc = dev_get_drvdata(dev);
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unsigned long val;
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s32 ret;
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ret = kstrtoul(buf, 0, &val);
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if (ret)
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return ret;
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ret = regmap_write(misc->regmap, SOC_POWER_LIMIT, (unsigned int)val);
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if (ret)
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return -EPROTO;
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return count;
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}
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static DEVICE_ATTR_RW(soc_power_limit);
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static struct attribute *smpro_misc_attrs[] = {
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&dev_attr_boot_progress.attr,
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&dev_attr_soc_power_limit.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(smpro_misc);
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static int smpro_misc_probe(struct platform_device *pdev)
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{
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struct smpro_misc *misc;
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misc = devm_kzalloc(&pdev->dev, sizeof(struct smpro_misc), GFP_KERNEL);
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if (!misc)
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return -ENOMEM;
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platform_set_drvdata(pdev, misc);
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misc->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!misc->regmap)
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return -ENODEV;
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return 0;
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}
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static struct platform_driver smpro_misc_driver = {
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.probe = smpro_misc_probe,
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.driver = {
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.name = "smpro-misc",
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.dev_groups = smpro_misc_groups,
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},
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};
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module_platform_driver(smpro_misc_driver);
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MODULE_AUTHOR("Tung Nguyen <tungnguyen@os.amperecomputing.com>");
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MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>");
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MODULE_DESCRIPTION("Ampere Altra SMpro Misc driver");
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MODULE_LICENSE("GPL");
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