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// SPDX-License-Identifier: GPL-2.0
/*
* Intel Speed Select Interface: MMIO Interface
* Copyright (c) 2019, Intel Corporation.
* All rights reserved.
*
* Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/sched/signal.h>
#include <linux/uaccess.h>
#include <uapi/linux/isst_if.h>
#include "isst_if_common.h"
struct isst_if_device {
void __iomem *punit_mmio;
struct mutex mutex;
};
static long isst_if_mmio_rd_wr(u8 *cmd_ptr, int *write_only, int resume)
{
struct isst_if_device *punit_dev;
struct isst_if_io_reg *io_reg;
struct pci_dev *pdev;
io_reg = (struct isst_if_io_reg *)cmd_ptr;
if (io_reg->reg < 0x04 || io_reg->reg > 0xD0)
return -EINVAL;
if (io_reg->read_write && !capable(CAP_SYS_ADMIN))
return -EPERM;
pdev = isst_if_get_pci_dev(io_reg->logical_cpu, 0, 0, 1);
if (!pdev)
return -EINVAL;
punit_dev = pci_get_drvdata(pdev);
if (!punit_dev)
return -EINVAL;
/*
* Ensure that operation is complete on a PCI device to avoid read
* write race by using per PCI device mutex.
*/
mutex_lock(&punit_dev->mutex);
if (io_reg->read_write) {
writel(io_reg->value, punit_dev->punit_mmio+io_reg->reg);
*write_only = 1;
} else {
io_reg->value = readl(punit_dev->punit_mmio+io_reg->reg);
*write_only = 0;
}
mutex_unlock(&punit_dev->mutex);
return 0;
}
static const struct pci_device_id isst_if_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, INTEL_RAPL_PRIO_DEVID_0)},
{ 0 },
};
MODULE_DEVICE_TABLE(pci, isst_if_ids);
static int isst_if_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct isst_if_device *punit_dev;
struct isst_if_cmd_cb cb;
u32 mmio_base, pcu_base;
u64 base_addr;
int ret;
punit_dev = devm_kzalloc(&pdev->dev, sizeof(*punit_dev), GFP_KERNEL);
if (!punit_dev)
return -ENOMEM;
ret = pcim_enable_device(pdev);
if (ret)
return ret;
ret = pci_read_config_dword(pdev, 0xD0, &mmio_base);
if (ret)
return ret;
ret = pci_read_config_dword(pdev, 0xFC, &pcu_base);
if (ret)
return ret;
pcu_base &= GENMASK(10, 0);
base_addr = (u64)mmio_base << 23 | (u64) pcu_base << 12;
punit_dev->punit_mmio = devm_ioremap(&pdev->dev, base_addr, 256);
if (!punit_dev->punit_mmio)
return -ENOMEM;
mutex_init(&punit_dev->mutex);
pci_set_drvdata(pdev, punit_dev);
memset(&cb, 0, sizeof(cb));
cb.cmd_size = sizeof(struct isst_if_io_reg);
cb.offset = offsetof(struct isst_if_io_regs, io_reg);
cb.cmd_callback = isst_if_mmio_rd_wr;
cb.owner = THIS_MODULE;
ret = isst_if_cdev_register(ISST_IF_DEV_MMIO, &cb);
if (ret)
mutex_destroy(&punit_dev->mutex);
return ret;
}
static void isst_if_remove(struct pci_dev *pdev)
{
struct isst_if_device *punit_dev;
punit_dev = pci_get_drvdata(pdev);
isst_if_cdev_unregister(ISST_IF_DEV_MBOX);
mutex_destroy(&punit_dev->mutex);
}
static struct pci_driver isst_if_pci_driver = {
.name = "isst_if_pci",
.id_table = isst_if_ids,
.probe = isst_if_probe,
.remove = isst_if_remove,
};
module_pci_driver(isst_if_pci_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel speed select interface mmio driver");
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