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linux/drivers/i2c/busses/i2c-designware-pcidrv.c
Axel Lin 56f2178898 i2c/busses: Use module_pci_driver 
Convert the drivers in drivers/i2c/busses/* to usemodule_pci_driver()
macro which makes the code smaller and a bit simpler.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Rudolf Marek <r.marek@assembler.cz>
Cc: Olof Johansson <olof@lixom.net>
Cc: "Mark M. Hoffman" <mhoffman@lightlink.com>
Cc: Tomoya MORINAGA <tomoya.rohm@gmail.com>
2012-07-24 14:13:56 +02:00

382 lines
9.0 KiB
C
Raw Blame History

/*
* Synopsys DesignWare I2C adapter driver (master only).
*
* Based on the TI DAVINCI I2C adapter driver.
*
* Copyright (C) 2006 Texas Instruments.
* Copyright (C) 2007 MontaVista Software Inc.
* Copyright (C) 2009 Provigent Ltd.
* Copyright (C) 2011 Intel corporation.
*
* ----------------------------------------------------------------------------
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
* ----------------------------------------------------------------------------
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
#include "i2c-designware-core.h"
#define DRIVER_NAME "i2c-designware-pci"
enum dw_pci_ctl_id_t {
moorestown_0,
moorestown_1,
moorestown_2,
medfield_0,
medfield_1,
medfield_2,
medfield_3,
medfield_4,
medfield_5,
};
struct dw_pci_controller {
u32 bus_num;
u32 bus_cfg;
u32 tx_fifo_depth;
u32 rx_fifo_depth;
u32 clk_khz;
};
#define INTEL_MID_STD_CFG (DW_IC_CON_MASTER | \
DW_IC_CON_SLAVE_DISABLE | \
DW_IC_CON_RESTART_EN)
static struct dw_pci_controller dw_pci_controllers[] = {
[moorestown_0] = {
.bus_num = 0,
.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
.tx_fifo_depth = 32,
.rx_fifo_depth = 32,
.clk_khz = 25000,
},
[moorestown_1] = {
.bus_num = 1,
.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
.tx_fifo_depth = 32,
.rx_fifo_depth = 32,
.clk_khz = 25000,
},
[moorestown_2] = {
.bus_num = 2,
.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
.tx_fifo_depth = 32,
.rx_fifo_depth = 32,
.clk_khz = 25000,
},
[medfield_0] = {
.bus_num = 0,
.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
.tx_fifo_depth = 32,
.rx_fifo_depth = 32,
.clk_khz = 25000,
},
[medfield_1] = {
.bus_num = 1,
.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
.tx_fifo_depth = 32,
.rx_fifo_depth = 32,
.clk_khz = 25000,
},
[medfield_2] = {
.bus_num = 2,
.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
.tx_fifo_depth = 32,
.rx_fifo_depth = 32,
.clk_khz = 25000,
},
[medfield_3] = {
.bus_num = 3,
.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
.tx_fifo_depth = 32,
.rx_fifo_depth = 32,
.clk_khz = 25000,
},
[medfield_4] = {
.bus_num = 4,
.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
.tx_fifo_depth = 32,
.rx_fifo_depth = 32,
.clk_khz = 25000,
},
[medfield_5] = {
.bus_num = 5,
.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
.tx_fifo_depth = 32,
.rx_fifo_depth = 32,
.clk_khz = 25000,
},
};
static struct i2c_algorithm i2c_dw_algo = {
.master_xfer = i2c_dw_xfer,
.functionality = i2c_dw_func,
};
static int i2c_dw_pci_suspend(struct device *dev)
{
struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
struct dw_i2c_dev *i2c = pci_get_drvdata(pdev);
int err;
i2c_dw_disable(i2c);
err = pci_save_state(pdev);
if (err) {
dev_err(&pdev->dev, "pci_save_state failed\n");
return err;
}
err = pci_set_power_state(pdev, PCI_D3hot);
if (err) {
dev_err(&pdev->dev, "pci_set_power_state failed\n");
return err;
}
return 0;
}
static int i2c_dw_pci_resume(struct device *dev)
{
struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
struct dw_i2c_dev *i2c = pci_get_drvdata(pdev);
int err;
u32 enabled;
enabled = i2c_dw_is_enabled(i2c);
if (enabled)
return 0;
err = pci_set_power_state(pdev, PCI_D0);
if (err) {
dev_err(&pdev->dev, "pci_set_power_state() failed\n");
return err;
}
pci_restore_state(pdev);
i2c_dw_init(i2c);
return 0;
}
static int i2c_dw_pci_runtime_idle(struct device *dev)
{
int err = pm_schedule_suspend(dev, 500);
dev_dbg(dev, "runtime_idle called\n");
if (err != 0)
return 0;
return -EBUSY;
}
static const struct dev_pm_ops i2c_dw_pm_ops = {
.resume = i2c_dw_pci_resume,
.suspend = i2c_dw_pci_suspend,
SET_RUNTIME_PM_OPS(i2c_dw_pci_suspend, i2c_dw_pci_resume,
i2c_dw_pci_runtime_idle)
};
static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
{
return dev->controller->clk_khz;
}
static int __devinit i2c_dw_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct dw_i2c_dev *dev;
struct i2c_adapter *adap;
unsigned long start, len;
void __iomem *base;
int r;
struct dw_pci_controller *controller;
if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
printk(KERN_ERR "dw_i2c_pci_probe: invalid driver data %ld\n",
id->driver_data);
return -EINVAL;
}
controller = &dw_pci_controllers[id->driver_data];
r = pci_enable_device(pdev);
if (r) {
dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
r);
goto exit;
}
/* Determine the address of the I2C area */
start = pci_resource_start(pdev, 0);
len = pci_resource_len(pdev, 0);
if (!start || len == 0) {
dev_err(&pdev->dev, "base address not set\n");
r = -ENODEV;
goto exit;
}
r = pci_request_region(pdev, 0, DRIVER_NAME);
if (r) {
dev_err(&pdev->dev, "failed to request I2C region "
"0x%lx-0x%lx\n", start,
(unsigned long)pci_resource_end(pdev, 0));
goto exit;
}
base = ioremap_nocache(start, len);
if (!base) {
dev_err(&pdev->dev, "I/O memory remapping failed\n");
r = -ENOMEM;
goto err_release_region;
}
dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
if (!dev) {
r = -ENOMEM;
goto err_release_region;
}
init_completion(&dev->cmd_complete);
mutex_init(&dev->lock);
dev->clk = NULL;
dev->controller = controller;
dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
dev->base = base;
dev->dev = get_device(&pdev->dev);
dev->functionality =
I2C_FUNC_I2C |
I2C_FUNC_SMBUS_BYTE |
I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_I2C_BLOCK;
dev->master_cfg = controller->bus_cfg;
pci_set_drvdata(pdev, dev);
dev->tx_fifo_depth = controller->tx_fifo_depth;
dev->rx_fifo_depth = controller->rx_fifo_depth;
r = i2c_dw_init(dev);
if (r)
goto err_iounmap;
adap = &dev->adapter;
i2c_set_adapdata(adap, dev);
adap->owner = THIS_MODULE;
adap->class = 0;
adap->algo = &i2c_dw_algo;
adap->dev.parent = &pdev->dev;
adap->nr = controller->bus_num;
snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci-%d",
adap->nr);
r = request_irq(pdev->irq, i2c_dw_isr, IRQF_SHARED, adap->name, dev);
if (r) {
dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
goto err_iounmap;
}
i2c_dw_disable_int(dev);
i2c_dw_clear_int(dev);
r = i2c_add_numbered_adapter(adap);
if (r) {
dev_err(&pdev->dev, "failure adding adapter\n");
goto err_free_irq;
}
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_allow(&pdev->dev);
return 0;
err_free_irq:
free_irq(pdev->irq, dev);
err_iounmap:
iounmap(dev->base);
pci_set_drvdata(pdev, NULL);
put_device(&pdev->dev);
kfree(dev);
err_release_region:
pci_release_region(pdev, 0);
exit:
return r;
}
static void __devexit i2c_dw_pci_remove(struct pci_dev *pdev)
{
struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
i2c_dw_disable(dev);
pm_runtime_forbid(&pdev->dev);
pm_runtime_get_noresume(&pdev->dev);
pci_set_drvdata(pdev, NULL);
i2c_del_adapter(&dev->adapter);
put_device(&pdev->dev);
free_irq(dev->irq, dev);
kfree(dev);
pci_release_region(pdev, 0);
}
/* work with hotplug and coldplug */
MODULE_ALIAS("i2c_designware-pci");
static DEFINE_PCI_DEVICE_TABLE(i2_designware_pci_ids) = {
/* Moorestown */
{ PCI_VDEVICE(INTEL, 0x0802), moorestown_0 },
{ PCI_VDEVICE(INTEL, 0x0803), moorestown_1 },
{ PCI_VDEVICE(INTEL, 0x0804), moorestown_2 },
/* Medfield */
{ PCI_VDEVICE(INTEL, 0x0817), medfield_3,},
{ PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
{ PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
{ PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
{ PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
{ PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
{ 0,}
};
MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);
static struct pci_driver dw_i2c_driver = {
.name = DRIVER_NAME,
.id_table = i2_designware_pci_ids,
.probe = i2c_dw_pci_probe,
.remove = __devexit_p(i2c_dw_pci_remove),
.driver = {
.pm = &i2c_dw_pm_ops,
},
};
module_pci_driver(dw_i2c_driver);
MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
MODULE_LICENSE("GPL");
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