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3abdc89b5e
Some later revisions after the original PASemi I2C controller introduce what likely is an enable bit to the CTL register. Without setting it the actual i2c transmission is never started. Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Sven Peter <sven@svenpeter.dev> Acked-by: Olof Johansson <olof@lixom.net> Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de> Signed-off-by: Wolfram Sang <wsa@kernel.org>
85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2006-2007 PA Semi, Inc
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*
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* SMBus host driver for PA Semi PWRficient
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/stddef.h>
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#include <linux/sched.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include "i2c-pasemi-core.h"
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#define CLK_100K_DIV 84
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#define CLK_400K_DIV 21
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static struct pci_driver pasemi_smb_pci_driver;
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static int pasemi_smb_pci_probe(struct pci_dev *dev,
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const struct pci_device_id *id)
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{
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struct pasemi_smbus *smbus;
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unsigned long base;
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int size;
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int error;
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if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO))
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return -ENODEV;
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smbus = devm_kzalloc(&dev->dev, sizeof(*smbus), GFP_KERNEL);
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if (!smbus)
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return -ENOMEM;
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smbus->dev = &dev->dev;
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base = pci_resource_start(dev, 0);
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size = pci_resource_len(dev, 0);
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smbus->clk_div = CLK_100K_DIV;
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/*
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* The original PASemi PCI controllers don't have a register for
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* their HW revision.
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*/
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smbus->hw_rev = PASEMI_HW_REV_PCI;
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if (!devm_request_region(&dev->dev, base, size,
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pasemi_smb_pci_driver.name))
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return -EBUSY;
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smbus->ioaddr = pcim_iomap(dev, 0, 0);
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if (!smbus->ioaddr)
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return -EBUSY;
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error = pasemi_i2c_common_probe(smbus);
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if (error)
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return error;
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pci_set_drvdata(dev, smbus);
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return 0;
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}
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static const struct pci_device_id pasemi_smb_pci_ids[] = {
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{ PCI_DEVICE(0x1959, 0xa003) },
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{ 0, }
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};
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MODULE_DEVICE_TABLE(pci, pasemi_smb_pci_ids);
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static struct pci_driver pasemi_smb_pci_driver = {
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.name = "i2c-pasemi",
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.id_table = pasemi_smb_pci_ids,
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.probe = pasemi_smb_pci_probe,
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};
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module_pci_driver(pasemi_smb_pci_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Olof Johansson <olof@lixom.net>");
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MODULE_DESCRIPTION("PA Semi PWRficient SMBus driver");
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