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be58eda775
The PCI part of the DesignWare I2C driver does a lot of things that are not required anymore. For example drivers aren't supposed to handle PCI state transitions themselves. This is all provided by the PCI bus core already. In addition to that there is no point scheduling RPM suspend on driver's idle hook but instead we can use RPM autosuspend for this (which is enabled in the driver already). As a bonus, this patch also fixes following compile warning which is emitted when the driver was compiled without CONFIG_PM_RUNTIME set: drivers/i2c/busses/i2c-designware-pcidrv.c:245:12: warning: ‘i2c_dw_pci_runtime_idle’ defined but not used [-Wunused-function] Reported-by: xinhui.pan <xinhuix.pan@intel.com> Reported-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
300 lines
7.4 KiB
C
300 lines
7.4 KiB
C
/*
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* Synopsys DesignWare I2C adapter driver (master only).
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*
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* Based on the TI DAVINCI I2C adapter driver.
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*
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* Copyright (C) 2006 Texas Instruments.
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* Copyright (C) 2007 MontaVista Software Inc.
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* Copyright (C) 2009 Provigent Ltd.
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* Copyright (C) 2011 Intel corporation.
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*
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* ----------------------------------------------------------------------------
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* ----------------------------------------------------------------------------
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include <linux/pm_runtime.h>
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#include "i2c-designware-core.h"
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#define DRIVER_NAME "i2c-designware-pci"
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enum dw_pci_ctl_id_t {
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moorestown_0,
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moorestown_1,
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moorestown_2,
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medfield_0,
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medfield_1,
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medfield_2,
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medfield_3,
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medfield_4,
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medfield_5,
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};
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struct dw_pci_controller {
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u32 bus_num;
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u32 bus_cfg;
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u32 tx_fifo_depth;
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u32 rx_fifo_depth;
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u32 clk_khz;
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};
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#define INTEL_MID_STD_CFG (DW_IC_CON_MASTER | \
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DW_IC_CON_SLAVE_DISABLE | \
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DW_IC_CON_RESTART_EN)
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static struct dw_pci_controller dw_pci_controllers[] = {
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[moorestown_0] = {
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.bus_num = 0,
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.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
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.tx_fifo_depth = 32,
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.rx_fifo_depth = 32,
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.clk_khz = 25000,
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},
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[moorestown_1] = {
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.bus_num = 1,
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.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
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.tx_fifo_depth = 32,
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.rx_fifo_depth = 32,
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.clk_khz = 25000,
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},
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[moorestown_2] = {
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.bus_num = 2,
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.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
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.tx_fifo_depth = 32,
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.rx_fifo_depth = 32,
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.clk_khz = 25000,
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},
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[medfield_0] = {
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.bus_num = 0,
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.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
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.tx_fifo_depth = 32,
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.rx_fifo_depth = 32,
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.clk_khz = 25000,
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},
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[medfield_1] = {
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.bus_num = 1,
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.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
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.tx_fifo_depth = 32,
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.rx_fifo_depth = 32,
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.clk_khz = 25000,
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},
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[medfield_2] = {
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.bus_num = 2,
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.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
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.tx_fifo_depth = 32,
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.rx_fifo_depth = 32,
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.clk_khz = 25000,
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},
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[medfield_3] = {
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.bus_num = 3,
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.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
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.tx_fifo_depth = 32,
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.rx_fifo_depth = 32,
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.clk_khz = 25000,
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},
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[medfield_4] = {
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.bus_num = 4,
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.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
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.tx_fifo_depth = 32,
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.rx_fifo_depth = 32,
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.clk_khz = 25000,
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},
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[medfield_5] = {
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.bus_num = 5,
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.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
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.tx_fifo_depth = 32,
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.rx_fifo_depth = 32,
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.clk_khz = 25000,
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},
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};
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static struct i2c_algorithm i2c_dw_algo = {
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.master_xfer = i2c_dw_xfer,
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.functionality = i2c_dw_func,
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};
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#ifdef CONFIG_PM
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static int i2c_dw_pci_suspend(struct device *dev)
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{
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struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
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i2c_dw_disable(pci_get_drvdata(pdev));
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return 0;
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}
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static int i2c_dw_pci_resume(struct device *dev)
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{
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struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
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return i2c_dw_init(pci_get_drvdata(pdev));
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}
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#endif
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static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend,
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i2c_dw_pci_resume, NULL);
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static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
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{
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return dev->controller->clk_khz;
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}
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static int i2c_dw_pci_probe(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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struct dw_i2c_dev *dev;
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struct i2c_adapter *adap;
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int r;
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struct dw_pci_controller *controller;
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if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
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dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__,
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id->driver_data);
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return -EINVAL;
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}
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controller = &dw_pci_controllers[id->driver_data];
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r = pcim_enable_device(pdev);
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if (r) {
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dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
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r);
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return r;
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}
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r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
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if (r) {
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dev_err(&pdev->dev, "I/O memory remapping failed\n");
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return r;
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}
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dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
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if (!dev)
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return -ENOMEM;
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init_completion(&dev->cmd_complete);
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mutex_init(&dev->lock);
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dev->clk = NULL;
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dev->controller = controller;
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dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
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dev->base = pcim_iomap_table(pdev)[0];
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dev->dev = &pdev->dev;
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dev->functionality =
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I2C_FUNC_I2C |
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I2C_FUNC_SMBUS_BYTE |
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I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_WORD_DATA |
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I2C_FUNC_SMBUS_I2C_BLOCK;
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dev->master_cfg = controller->bus_cfg;
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pci_set_drvdata(pdev, dev);
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dev->tx_fifo_depth = controller->tx_fifo_depth;
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dev->rx_fifo_depth = controller->rx_fifo_depth;
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r = i2c_dw_init(dev);
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if (r)
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return r;
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adap = &dev->adapter;
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i2c_set_adapdata(adap, dev);
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adap->owner = THIS_MODULE;
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adap->class = 0;
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adap->algo = &i2c_dw_algo;
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adap->dev.parent = &pdev->dev;
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adap->nr = controller->bus_num;
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snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci-%d",
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adap->nr);
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r = devm_request_irq(&pdev->dev, pdev->irq, i2c_dw_isr, IRQF_SHARED,
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adap->name, dev);
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if (r) {
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dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
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return r;
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}
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i2c_dw_disable_int(dev);
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i2c_dw_clear_int(dev);
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r = i2c_add_numbered_adapter(adap);
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if (r) {
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dev_err(&pdev->dev, "failure adding adapter\n");
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return r;
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}
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pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
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pm_runtime_use_autosuspend(&pdev->dev);
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pm_runtime_put_autosuspend(&pdev->dev);
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pm_runtime_allow(&pdev->dev);
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return 0;
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}
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static void i2c_dw_pci_remove(struct pci_dev *pdev)
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{
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struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
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i2c_dw_disable(dev);
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pm_runtime_forbid(&pdev->dev);
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pm_runtime_get_noresume(&pdev->dev);
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i2c_del_adapter(&dev->adapter);
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}
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/* work with hotplug and coldplug */
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MODULE_ALIAS("i2c_designware-pci");
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static DEFINE_PCI_DEVICE_TABLE(i2_designware_pci_ids) = {
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/* Moorestown */
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{ PCI_VDEVICE(INTEL, 0x0802), moorestown_0 },
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{ PCI_VDEVICE(INTEL, 0x0803), moorestown_1 },
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{ PCI_VDEVICE(INTEL, 0x0804), moorestown_2 },
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/* Medfield */
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{ PCI_VDEVICE(INTEL, 0x0817), medfield_3,},
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{ PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
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{ PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
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{ PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
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{ PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
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{ PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
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{ 0,}
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};
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MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);
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static struct pci_driver dw_i2c_driver = {
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.name = DRIVER_NAME,
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.id_table = i2_designware_pci_ids,
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.probe = i2c_dw_pci_probe,
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.remove = i2c_dw_pci_remove,
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.driver = {
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.pm = &i2c_dw_pm_ops,
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},
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};
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module_pci_driver(dw_i2c_driver);
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MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
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MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
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MODULE_LICENSE("GPL");
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