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https://github.com/brain-hackers/linux-brain.git
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90312351fd
- The functions related to I2C master mode of operation were transformed in a single driver. - Common definitions were moved to i2c-designware-core.h - The i2c-designware-core is now only a library file, the functions associated are in a source file called i2c-designware-common and are used by both i2c-designware-master and i2c-designware-slave. - To decrease noise in namespace common i2c_dw_*() functions are now using ops to keep them private. - Designware PCI driver had to be changed to match the previous ops functions implementation. Almost all of the "core" source is now part of the "master" source. The difference is the functions used by both modes and they are in the "common" source file. Signed-off-by: Luis Oliveira <lolivei@synopsys.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
361 lines
8.9 KiB
C
361 lines
8.9 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, 2015, 2016 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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*
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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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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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};
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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 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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u32 functionality;
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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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};
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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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/* 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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static int mfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
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{
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switch (pdev->device) {
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case 0x0817:
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c->bus_cfg &= ~DW_IC_CON_SPEED_MASK;
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c->bus_cfg |= DW_IC_CON_SPEED_STD;
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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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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 busses 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 struct dw_pci_controller dw_pci_controllers[] = {
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[medfield] = {
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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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.functionality = I2C_FUNC_10BIT_ADDR,
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.clk_khz = 25000,
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.setup = mfld_setup,
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},
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[merrifield] = {
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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 = 64,
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.rx_fifo_depth = 64,
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.functionality = I2C_FUNC_10BIT_ADDR,
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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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.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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.functionality = I2C_FUNC_10BIT_ADDR,
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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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.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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.functionality = I2C_FUNC_10BIT_ADDR,
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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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.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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.functionality = I2C_FUNC_10BIT_ADDR,
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.flags = MODEL_CHERRYTRAIL,
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.scl_sda_cfg = &byt_config,
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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 pci_dev *pdev = to_pci_dev(dev);
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struct dw_i2c_dev *i_dev = pci_get_drvdata(pdev);
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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 pci_dev *pdev = to_pci_dev(dev);
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struct dw_i2c_dev *i_dev = pci_get_drvdata(pdev);
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return i_dev->init(i_dev);
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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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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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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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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->irq = pdev->irq;
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dev->flags |= controller->flags;
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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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return r;
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}
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dev->functionality = controller->functionality |
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DW_IC_DEFAULT_FUNCTIONALITY;
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dev->master_cfg = controller->bus_cfg;
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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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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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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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return r;
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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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}
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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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{ 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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