cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

i2c-pasemi-pci.c (1905B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2006-2007 PA Semi, Inc
      4 *
      5 * SMBus host driver for PA Semi PWRficient
      6 */
      7
      8#include <linux/module.h>
      9#include <linux/pci.h>
     10#include <linux/kernel.h>
     11#include <linux/stddef.h>
     12#include <linux/sched.h>
     13#include <linux/i2c.h>
     14#include <linux/delay.h>
     15#include <linux/slab.h>
     16#include <linux/io.h>
     17
     18#include "i2c-pasemi-core.h"
     19
     20#define CLK_100K_DIV	84
     21#define CLK_400K_DIV	21
     22
     23static struct pci_driver pasemi_smb_pci_driver;
     24
     25static int pasemi_smb_pci_probe(struct pci_dev *dev,
     26				      const struct pci_device_id *id)
     27{
     28	struct pasemi_smbus *smbus;
     29	unsigned long base;
     30	int size;
     31	int error;
     32
     33	if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO))
     34		return -ENODEV;
     35
     36	smbus = devm_kzalloc(&dev->dev, sizeof(*smbus), GFP_KERNEL);
     37	if (!smbus)
     38		return -ENOMEM;
     39
     40	smbus->dev = &dev->dev;
     41	base = pci_resource_start(dev, 0);
     42	size = pci_resource_len(dev, 0);
     43	smbus->clk_div = CLK_100K_DIV;
     44
     45	/*
     46	 * The original PASemi PCI controllers don't have a register for
     47	 * their HW revision.
     48	 */
     49	smbus->hw_rev = PASEMI_HW_REV_PCI;
     50
     51	if (!devm_request_region(&dev->dev, base, size,
     52			    pasemi_smb_pci_driver.name))
     53		return -EBUSY;
     54
     55	smbus->ioaddr = pcim_iomap(dev, 0, 0);
     56	if (!smbus->ioaddr)
     57		return -EBUSY;
     58
     59	smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
     60	error = pasemi_i2c_common_probe(smbus);
     61	if (error)
     62		return error;
     63
     64	pci_set_drvdata(dev, smbus);
     65
     66	return 0;
     67}
     68
     69static const struct pci_device_id pasemi_smb_pci_ids[] = {
     70	{ PCI_DEVICE(0x1959, 0xa003) },
     71	{ 0, }
     72};
     73
     74MODULE_DEVICE_TABLE(pci, pasemi_smb_pci_ids);
     75
     76static struct pci_driver pasemi_smb_pci_driver = {
     77	.name		= "i2c-pasemi",
     78	.id_table	= pasemi_smb_pci_ids,
     79	.probe		= pasemi_smb_pci_probe,
     80};
     81
     82module_pci_driver(pasemi_smb_pci_driver);
     83
     84MODULE_LICENSE("GPL");
     85MODULE_AUTHOR("Olof Johansson <olof@lixom.net>");
     86MODULE_DESCRIPTION("PA Semi PWRficient SMBus driver");