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i2c-ibm_iic: Support building as an of_platform driver 

This patch allows the i2c-ibm_iic driver to be built either as an ocp 
driver or an of_platform driver. This allows it to run under the powerpc 
arch but maintains backward compatibility with the ppc arch.

Signed-off-by: Sean MacLennan <smaclennan@pikatech.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Sean MacLennan 2008-04-22 22:16:47 +02:00 committed by Jean Delvare
parent 681aae82c5
commit 838349b5c6
2 changed files with 187 additions and 2 deletions
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2
drivers/i2c/busses/Kconfig
View File

@ -246,7 +246,7 @@ config I2C_PIIX4
config I2C_IBM_IIC
tristate "IBM PPC 4xx on-chip I2C interface"
depends on IBM_OCP
depends on 4xx
help
Say Y here if you want to use IIC peripheral found on
embedded IBM PPC 4xx based systems.

187
drivers/i2c/busses/i2c-ibm_iic.c
View File

@ -6,6 +6,9 @@
* Copyright (c) 2003, 2004 Zultys Technologies.
* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
*
* Copyright (c) 2008 PIKA Technologies
* Sean MacLennan <smaclennan@pikatech.com>
*
* Based on original work by
* Ian DaSilva <idasilva@mvista.com>
* Armin Kuster <akuster@mvista.com>
@ -39,12 +42,17 @@
#include <asm/io.h>
#include <linux/i2c.h>
#include <linux/i2c-id.h>
#ifdef CONFIG_IBM_OCP
#include <asm/ocp.h>
#include <asm/ibm4xx.h>
#else
#include <linux/of_platform.h>
#endif
#include "i2c-ibm_iic.h"
#define DRIVER_VERSION "2.1"
#define DRIVER_VERSION "2.2"
MODULE_DESCRIPTION("IBM IIC driver v" DRIVER_VERSION);
MODULE_LICENSE("GPL");
@ -657,6 +665,7 @@ static inline u8 iic_clckdiv(unsigned int opb)
return (u8)((opb + 9) / 10 - 1);
}
#ifdef CONFIG_IBM_OCP
/*
* Register single IIC interface
*/
@ -828,5 +837,181 @@ static void __exit iic_exit(void)
ocp_unregister_driver(&ibm_iic_driver);
}
#else /* !CONFIG_IBM_OCP */
static int __devinit iic_request_irq(struct of_device *ofdev,
struct ibm_iic_private *dev)
{
struct device_node *np = ofdev->node;
int irq;
if (iic_force_poll)
return NO_IRQ;
irq = irq_of_parse_and_map(np, 0);
if (irq == NO_IRQ) {
dev_err(&ofdev->dev, "irq_of_parse_and_map failed\n");
return NO_IRQ;
}
/* Disable interrupts until we finish initialization, assumes
* level-sensitive IRQ setup...
*/
iic_interrupt_mode(dev, 0);
if (request_irq(irq, iic_handler, 0, "IBM IIC", dev)) {
dev_err(&ofdev->dev, "request_irq %d failed\n", irq);
/* Fallback to the polling mode */
return NO_IRQ;
}
return irq;
}
/*
* Register single IIC interface
*/
static int __devinit iic_probe(struct of_device *ofdev,
const struct of_device_id *match)
{
struct device_node *np = ofdev->node;
struct ibm_iic_private *dev;
struct i2c_adapter *adap;
const u32 *indexp, *freq;
int ret;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
dev_err(&ofdev->dev, "failed to allocate device data\n");
return -ENOMEM;
}
dev_set_drvdata(&ofdev->dev, dev);
indexp = of_get_property(np, "index", NULL);
if (!indexp) {
dev_err(&ofdev->dev, "no index specified\n");
ret = -EINVAL;
goto error_cleanup;
}
dev->idx = *indexp;
dev->vaddr = of_iomap(np, 0);
if (dev->vaddr == NULL) {
dev_err(&ofdev->dev, "failed to iomap device\n");
ret = -ENXIO;
goto error_cleanup;
}
init_waitqueue_head(&dev->wq);
dev->irq = iic_request_irq(ofdev, dev);
if (dev->irq == NO_IRQ)
dev_warn(&ofdev->dev, "using polling mode\n");
/* Board specific settings */
if (iic_force_fast || of_get_property(np, "fast-mode", NULL))
dev->fast_mode = 1;
freq = of_get_property(np, "clock-frequency", NULL);
if (freq == NULL) {
freq = of_get_property(np->parent, "clock-frequency", NULL);
if (freq == NULL) {
dev_err(&ofdev->dev, "Unable to get bus frequency\n");
ret = -EINVAL;
goto error_cleanup;
}
}
dev->clckdiv = iic_clckdiv(*freq);
dev_dbg(&ofdev->dev, "clckdiv = %d\n", dev->clckdiv);
/* Initialize IIC interface */
iic_dev_init(dev);
/* Register it with i2c layer */
adap = &dev->adap;
adap->dev.parent = &ofdev->dev;
strlcpy(adap->name, "IBM IIC", sizeof(adap->name));
i2c_set_adapdata(adap, dev);
adap->id = I2C_HW_OCP;
adap->class = I2C_CLASS_HWMON;
adap->algo = &iic_algo;
adap->timeout = 1;
adap->nr = dev->idx;
ret = i2c_add_numbered_adapter(adap);
if (ret < 0) {
dev_err(&ofdev->dev, "failed to register i2c adapter\n");
goto error_cleanup;
}
dev_info(&ofdev->dev, "using %s mode\n",
dev->fast_mode ? "fast (400 kHz)" : "standard (100 kHz)");
return 0;
error_cleanup:
if (dev->irq != NO_IRQ) {
iic_interrupt_mode(dev, 0);
free_irq(dev->irq, dev);
}
if (dev->vaddr)
iounmap(dev->vaddr);
dev_set_drvdata(&ofdev->dev, NULL);
kfree(dev);
return ret;
}
/*
* Cleanup initialized IIC interface
*/
static int __devexit iic_remove(struct of_device *ofdev)
{
struct ibm_iic_private *dev = dev_get_drvdata(&ofdev->dev);
dev_set_drvdata(&ofdev->dev, NULL);
i2c_del_adapter(&dev->adap);
if (dev->irq != NO_IRQ) {
iic_interrupt_mode(dev, 0);
free_irq(dev->irq, dev);
}
iounmap(dev->vaddr);
kfree(dev);
return 0;
}
static const struct of_device_id ibm_iic_match[] = {
{ .compatible = "ibm,iic-405ex", },
{ .compatible = "ibm,iic-405gp", },
{ .compatible = "ibm,iic-440gp", },
{ .compatible = "ibm,iic-440gpx", },
{ .compatible = "ibm,iic-440grx", },
{}
};
static struct of_platform_driver ibm_iic_driver = {
.name = "ibm-iic",
.match_table = ibm_iic_match,
.probe = iic_probe,
.remove = __devexit_p(iic_remove),
};
static int __init iic_init(void)
{
return of_register_platform_driver(&ibm_iic_driver);
}
static void __exit iic_exit(void)
{
of_unregister_platform_driver(&ibm_iic_driver);
}
#endif /* CONFIG_IBM_OCP */
module_init(iic_init);
module_exit(iic_exit);