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// SPDX-License-Identifier: GPL-2.0
/*
* AMD Versal SysMon MMIO platform driver
*
* Copyright (C) 2019 - 2022, Xilinx, Inc.
* Copyright (C) 2022 - 2026, Advanced Micro Devices, Inc.
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/types.h>
#include "versal-sysmon.h"
struct sysmon_mmio {
void __iomem *base;
};
static int sysmon_mmio_reg_read(void *context, unsigned int reg, unsigned int *val)
{
struct sysmon_mmio *mmio = context;
*val = readl(mmio->base + reg);
return 0;
}
static int sysmon_mmio_reg_write(void *context, unsigned int reg, unsigned int val)
{
struct sysmon_mmio *mmio = context;
/* NPI must be unlocked before any register write except to NPI_LOCK */
if (reg != SYSMON_NPI_LOCK)
writel(SYSMON_NPI_UNLOCK_CODE, mmio->base + SYSMON_NPI_LOCK);
writel(val, mmio->base + reg);
return 0;
}
static const struct regmap_config sysmon_mmio_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = SYSMON_REG_STRIDE,
.max_register = SYSMON_MAX_REG,
.reg_read = sysmon_mmio_reg_read,
.reg_write = sysmon_mmio_reg_write,
.fast_io = true,
};
static int sysmon_platform_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct sysmon_mmio *mmio;
struct regmap *regmap;
mmio = devm_kzalloc(dev, sizeof(*mmio), GFP_KERNEL);
if (!mmio)
return -ENOMEM;
mmio->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mmio->base))
return PTR_ERR(mmio->base);
regmap = devm_regmap_init(dev, NULL, mmio, &sysmon_mmio_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
return devm_versal_sysmon_core_probe(dev, regmap);
}
static const struct of_device_id sysmon_of_match_table[] = {
{ .compatible = "xlnx,versal-sysmon" },
{ }
};
MODULE_DEVICE_TABLE(of, sysmon_of_match_table);
static struct platform_driver sysmon_platform_driver = {
.probe = sysmon_platform_probe,
.driver = {
.name = "versal-sysmon",
.of_match_table = sysmon_of_match_table,
},
};
module_platform_driver(sysmon_platform_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("AMD Versal SysMon Platform Driver");
MODULE_IMPORT_NS("VERSAL_SYSMON");
MODULE_AUTHOR("Salih Erim <salih.erim@amd.com>");
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