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419 lines
9.7 KiB
419 lines
9.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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, 2015, 2016 Intel Corporation. |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/delay.h> |
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#include <linux/err.h> |
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#include <linux/errno.h> |
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#include <linux/i2c.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/pci.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include "i2c-designware-core.h" |
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#define DRIVER_NAME "i2c-designware-pci" |
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#define AMD_CLK_RATE_HZ 100000 |
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enum dw_pci_ctl_id_t { |
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medfield, |
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merrifield, |
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baytrail, |
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cherrytrail, |
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haswell, |
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elkhartlake, |
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navi_amd, |
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}; |
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struct dw_scl_sda_cfg { |
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u32 ss_hcnt; |
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u32 fs_hcnt; |
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u32 ss_lcnt; |
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u32 fs_lcnt; |
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u32 sda_hold; |
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}; |
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struct dw_pci_controller { |
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u32 bus_num; |
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u32 flags; |
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struct dw_scl_sda_cfg *scl_sda_cfg; |
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int (*setup)(struct pci_dev *pdev, struct dw_pci_controller *c); |
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u32 (*get_clk_rate_khz)(struct dw_i2c_dev *dev); |
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}; |
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/* Merrifield HCNT/LCNT/SDA hold time */ |
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static struct dw_scl_sda_cfg mrfld_config = { |
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.ss_hcnt = 0x2f8, |
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.fs_hcnt = 0x87, |
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.ss_lcnt = 0x37b, |
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.fs_lcnt = 0x10a, |
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}; |
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/* BayTrail HCNT/LCNT/SDA hold time */ |
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static struct dw_scl_sda_cfg byt_config = { |
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.ss_hcnt = 0x200, |
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.fs_hcnt = 0x55, |
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.ss_lcnt = 0x200, |
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.fs_lcnt = 0x99, |
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.sda_hold = 0x6, |
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}; |
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/* Haswell HCNT/LCNT/SDA hold time */ |
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static struct dw_scl_sda_cfg hsw_config = { |
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.ss_hcnt = 0x01b0, |
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.fs_hcnt = 0x48, |
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.ss_lcnt = 0x01fb, |
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.fs_lcnt = 0xa0, |
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.sda_hold = 0x9, |
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}; |
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/* NAVI-AMD HCNT/LCNT/SDA hold time */ |
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static struct dw_scl_sda_cfg navi_amd_config = { |
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.ss_hcnt = 0x1ae, |
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.ss_lcnt = 0x23a, |
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.sda_hold = 0x9, |
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}; |
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static u32 mfld_get_clk_rate_khz(struct dw_i2c_dev *dev) |
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{ |
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return 25000; |
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} |
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static u32 navi_amd_get_clk_rate_khz(struct dw_i2c_dev *dev) |
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{ |
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return AMD_CLK_RATE_HZ; |
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} |
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static int mfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c) |
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{ |
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struct dw_i2c_dev *dev = dev_get_drvdata(&pdev->dev); |
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switch (pdev->device) { |
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case 0x0817: |
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dev->timings.bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ; |
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fallthrough; |
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case 0x0818: |
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case 0x0819: |
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c->bus_num = pdev->device - 0x817 + 3; |
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return 0; |
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case 0x082C: |
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case 0x082D: |
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case 0x082E: |
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c->bus_num = pdev->device - 0x82C + 0; |
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return 0; |
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} |
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return -ENODEV; |
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} |
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/* |
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* TODO find a better way how to deduplicate instantiation |
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* of USB PD slave device from nVidia GPU driver. |
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*/ |
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static int navi_amd_register_client(struct dw_i2c_dev *dev) |
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{ |
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struct i2c_board_info info; |
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memset(&info, 0, sizeof(struct i2c_board_info)); |
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strscpy(info.type, "ccgx-ucsi", I2C_NAME_SIZE); |
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info.addr = 0x08; |
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info.irq = dev->irq; |
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dev->slave = i2c_new_client_device(&dev->adapter, &info); |
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if (IS_ERR(dev->slave)) |
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return PTR_ERR(dev->slave); |
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return 0; |
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} |
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static int navi_amd_setup(struct pci_dev *pdev, struct dw_pci_controller *c) |
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{ |
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struct dw_i2c_dev *dev = dev_get_drvdata(&pdev->dev); |
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dev->flags |= MODEL_AMD_NAVI_GPU; |
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dev->timings.bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ; |
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return 0; |
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} |
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static int mrfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c) |
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{ |
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/* |
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* On Intel Merrifield the user visible i2c buses are enumerated |
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* [1..7]. So, we add 1 to shift the default range. Besides that the |
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* first PCI slot provides 4 functions, that's why we have to add 0 to |
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* the first slot and 4 to the next one. |
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*/ |
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switch (PCI_SLOT(pdev->devfn)) { |
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case 8: |
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c->bus_num = PCI_FUNC(pdev->devfn) + 0 + 1; |
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return 0; |
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case 9: |
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c->bus_num = PCI_FUNC(pdev->devfn) + 4 + 1; |
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return 0; |
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} |
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return -ENODEV; |
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} |
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static u32 ehl_get_clk_rate_khz(struct dw_i2c_dev *dev) |
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{ |
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return 100000; |
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} |
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static struct dw_pci_controller dw_pci_controllers[] = { |
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[medfield] = { |
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.bus_num = -1, |
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.setup = mfld_setup, |
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.get_clk_rate_khz = mfld_get_clk_rate_khz, |
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}, |
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[merrifield] = { |
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.bus_num = -1, |
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.scl_sda_cfg = &mrfld_config, |
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.setup = mrfld_setup, |
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}, |
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[baytrail] = { |
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.bus_num = -1, |
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.scl_sda_cfg = &byt_config, |
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}, |
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[haswell] = { |
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.bus_num = -1, |
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.scl_sda_cfg = &hsw_config, |
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}, |
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[cherrytrail] = { |
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.bus_num = -1, |
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.scl_sda_cfg = &byt_config, |
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}, |
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[elkhartlake] = { |
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.bus_num = -1, |
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.get_clk_rate_khz = ehl_get_clk_rate_khz, |
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}, |
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[navi_amd] = { |
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.bus_num = -1, |
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.scl_sda_cfg = &navi_amd_config, |
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.setup = navi_amd_setup, |
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.get_clk_rate_khz = navi_amd_get_clk_rate_khz, |
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}, |
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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 dw_i2c_dev *i_dev = dev_get_drvdata(dev); |
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i_dev->suspended = true; |
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i_dev->disable(i_dev); |
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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 dw_i2c_dev *i_dev = dev_get_drvdata(dev); |
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int ret; |
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ret = i_dev->init(i_dev); |
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i_dev->suspended = false; |
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return ret; |
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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 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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struct dw_scl_sda_cfg *cfg; |
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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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pci_set_master(pdev); |
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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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r = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); |
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if (r < 0) |
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return r; |
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dev->get_clk_rate_khz = controller->get_clk_rate_khz; |
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dev->timings.bus_freq_hz = I2C_MAX_FAST_MODE_FREQ; |
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dev->base = pcim_iomap_table(pdev)[0]; |
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dev->dev = &pdev->dev; |
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dev->irq = pci_irq_vector(pdev, 0); |
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dev->flags |= controller->flags; |
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pci_set_drvdata(pdev, dev); |
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if (controller->setup) { |
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r = controller->setup(pdev, controller); |
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if (r) { |
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pci_free_irq_vectors(pdev); |
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return r; |
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} |
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} |
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i2c_dw_adjust_bus_speed(dev); |
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if (has_acpi_companion(&pdev->dev)) |
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i2c_dw_acpi_configure(&pdev->dev); |
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r = i2c_dw_validate_speed(dev); |
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if (r) { |
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pci_free_irq_vectors(pdev); |
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return r; |
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} |
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i2c_dw_configure(dev); |
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if (controller->scl_sda_cfg) { |
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cfg = controller->scl_sda_cfg; |
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dev->ss_hcnt = cfg->ss_hcnt; |
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dev->fs_hcnt = cfg->fs_hcnt; |
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dev->ss_lcnt = cfg->ss_lcnt; |
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dev->fs_lcnt = cfg->fs_lcnt; |
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dev->sda_hold_time = cfg->sda_hold; |
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} |
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adap = &dev->adapter; |
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adap->owner = THIS_MODULE; |
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adap->class = 0; |
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ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev)); |
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adap->nr = controller->bus_num; |
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r = i2c_dw_probe(dev); |
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if (r) { |
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pci_free_irq_vectors(pdev); |
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return r; |
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} |
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if ((dev->flags & MODEL_MASK) == MODEL_AMD_NAVI_GPU) { |
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r = navi_amd_register_client(dev); |
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if (r) { |
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dev_err(dev->dev, "register client failed with %d\n", r); |
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return r; |
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} |
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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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dev->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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devm_free_irq(&pdev->dev, dev->irq, dev); |
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pci_free_irq_vectors(pdev); |
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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 const struct pci_device_id i2_designware_pci_ids[] = { |
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/* Medfield */ |
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{ PCI_VDEVICE(INTEL, 0x0817), medfield }, |
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{ PCI_VDEVICE(INTEL, 0x0818), medfield }, |
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{ PCI_VDEVICE(INTEL, 0x0819), medfield }, |
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{ PCI_VDEVICE(INTEL, 0x082C), medfield }, |
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{ PCI_VDEVICE(INTEL, 0x082D), medfield }, |
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{ PCI_VDEVICE(INTEL, 0x082E), medfield }, |
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/* Merrifield */ |
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{ PCI_VDEVICE(INTEL, 0x1195), merrifield }, |
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{ PCI_VDEVICE(INTEL, 0x1196), merrifield }, |
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/* Baytrail */ |
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{ PCI_VDEVICE(INTEL, 0x0F41), baytrail }, |
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{ PCI_VDEVICE(INTEL, 0x0F42), baytrail }, |
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{ PCI_VDEVICE(INTEL, 0x0F43), baytrail }, |
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{ PCI_VDEVICE(INTEL, 0x0F44), baytrail }, |
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{ PCI_VDEVICE(INTEL, 0x0F45), baytrail }, |
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{ PCI_VDEVICE(INTEL, 0x0F46), baytrail }, |
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{ PCI_VDEVICE(INTEL, 0x0F47), baytrail }, |
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/* Haswell */ |
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{ PCI_VDEVICE(INTEL, 0x9c61), haswell }, |
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{ PCI_VDEVICE(INTEL, 0x9c62), haswell }, |
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/* Braswell / Cherrytrail */ |
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{ PCI_VDEVICE(INTEL, 0x22C1), cherrytrail }, |
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{ PCI_VDEVICE(INTEL, 0x22C2), cherrytrail }, |
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{ PCI_VDEVICE(INTEL, 0x22C3), cherrytrail }, |
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{ PCI_VDEVICE(INTEL, 0x22C4), cherrytrail }, |
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{ PCI_VDEVICE(INTEL, 0x22C5), cherrytrail }, |
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{ PCI_VDEVICE(INTEL, 0x22C6), cherrytrail }, |
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{ PCI_VDEVICE(INTEL, 0x22C7), cherrytrail }, |
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/* Elkhart Lake (PSE I2C) */ |
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{ PCI_VDEVICE(INTEL, 0x4bb9), elkhartlake }, |
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{ PCI_VDEVICE(INTEL, 0x4bba), elkhartlake }, |
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{ PCI_VDEVICE(INTEL, 0x4bbb), elkhartlake }, |
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{ PCI_VDEVICE(INTEL, 0x4bbc), elkhartlake }, |
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{ PCI_VDEVICE(INTEL, 0x4bbd), elkhartlake }, |
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{ PCI_VDEVICE(INTEL, 0x4bbe), elkhartlake }, |
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{ PCI_VDEVICE(INTEL, 0x4bbf), elkhartlake }, |
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{ PCI_VDEVICE(INTEL, 0x4bc0), elkhartlake }, |
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{ PCI_VDEVICE(ATI, 0x7314), navi_amd }, |
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{ PCI_VDEVICE(ATI, 0x73a4), navi_amd }, |
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{ PCI_VDEVICE(ATI, 0x73e4), navi_amd }, |
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{ PCI_VDEVICE(ATI, 0x73c4), navi_amd }, |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter"); |
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MODULE_LICENSE("GPL");
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