Xiic cores are seen on ppc and microblaze arches. Both arches are using
device-trees
instead of platform buses to descrive its peripherals.
This patch ports i2c-xiic.c from platform bus to OF.
---
drivers/i2c/busses/i2c-xiic.c | 121 ++++++++++++++++++++++-------------------
1 files changed, 64 insertions(+), 57 deletions(-)
diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c
index a9c419e..62f0ca5 100644
--- a/drivers/i2c/busses/i2c-xiic.c
+++ b/drivers/i2c/busses/i2c-xiic.c
@@ -2,6 +2,7 @@
* i2c-xiic.c
* Copyright (c) 2002-2007 Xilinx Inc.
* Copyright (c) 2009-2010 Intel Corporation
+ * Copyright (c) 2010 Qtechnology A/S
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -23,6 +24,8 @@
* Mocean Laboratories forked off the GNU/Linux platform work into a
* separate company called Pelagicore AB, which commited the code to the
* kernel.
+ *
+ * Ricardo Ribalda: Ported from platform device to device tree (OF)
*/
/* Supports:
@@ -33,13 +36,16 @@
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/delay.h>
-#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/i2c-xiic.h>
#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_i2c.h>
#include <linux/slab.h>
+#include <asm/of_device.h>
#define DRIVER_NAME "xiic-i2c"
@@ -68,11 +74,14 @@ struct xiic_i2c {
struct i2c_adapter adap;
struct i2c_msg *tx_msg;
spinlock_t lock;
- unsigned int tx_pos;
+ unsigned int tx_pos;
unsigned int nmsgs;
enum xilinx_i2c_state state;
struct i2c_msg *rx_msg;
int rx_pos;
+ int irq;
+ unsigned long iomem;
+ size_t iolen;
};
@@ -175,27 +184,27 @@ static void __xiic_start_xfer(struct xiic_i2c *i2c);
static inline void xiic_setreg8(struct xiic_i2c *i2c, int reg, u8 value)
{
- iowrite8(value, i2c->base + reg);
+ out_be32(i2c->base + reg,value);
}
static inline u8 xiic_getreg8(struct xiic_i2c *i2c, int reg)
{
- return ioread8(i2c->base + reg);
+ return in_be32(i2c->base + reg);
}
static inline void xiic_setreg16(struct xiic_i2c *i2c, int reg, u16 value)
{
- iowrite16(value, i2c->base + reg);
+ out_be32(i2c->base + reg,value);
}
static inline void xiic_setreg32(struct xiic_i2c *i2c, int reg, int value)
{
- iowrite32(value, i2c->base + reg);
+ out_be32(i2c->base + reg,value);
}
static inline int xiic_getreg32(struct xiic_i2c *i2c, int reg)
{
- return ioread32(i2c->base + reg);
+ return in_be32(i2c->base + reg);
}
static inline void xiic_irq_dis(struct xiic_i2c *i2c, u32 mask)
@@ -362,7 +371,7 @@ static void xiic_process(struct xiic_i2c *i2c)
* this is probably a TX error
*/
- dev_dbg(i2c->adap.dev.parent, "%s error\n", __func__);
+ dev_err(i2c->adap.dev.parent, "%s error\n", __func__);
/* dynamic mode seem to suffer from problems if we just flushes
* fifos and the next message is a TX with len 0 (only addr)
@@ -378,7 +387,7 @@ static void xiic_process(struct xiic_i2c *i2c)
clr = XIIC_INTR_RX_FULL_MASK;
if (!i2c->rx_msg) {
- dev_dbg(i2c->adap.dev.parent,
+ dev_err(i2c->adap.dev.parent,
"%s unexpexted RX IRQ\n", __func__);
xiic_clear_rx_fifo(i2c);
goto out;
@@ -687,122 +696,120 @@ static struct i2c_adapter xiic_adapter = {
.algo = &xiic_algorithm,
};
-
-static int __devinit xiic_i2c_probe(struct platform_device *pdev)
+static int __init
+xiic_i2c_probe(struct of_device *op, const struct of_device_id *match)
{
- struct xiic_i2c *i2c;
- struct xiic_i2c_platform_data *pdata;
- struct resource *res;
- int ret, irq;
- u8 i;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- goto resource_missing;
-
- irq = platform_get_irq(pdev, 0);
- if (irq < 0)
- goto resource_missing;
- pdata = (struct xiic_i2c_platform_data *) pdev->dev.platform_data;
- if (!pdata)
- return -EINVAL;
+ struct xiic_i2c *i2c;
+ struct resource mem;
+ int ret;
i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
if (!i2c)
return -ENOMEM;
- if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
- dev_err(&pdev->dev, "Memory region busy\n");
+ i2c->irq=irq_of_parse_and_map(op->node,0);
+ if (!i2c->irq)
+ goto resource_missing;
+
+ if (of_address_to_resource(op->node,0,&mem))
+ goto resource_missing;
+ i2c->iomem=mem.start;
+ i2c->iolen=mem.end-mem.start+1;
+
+ if (!request_mem_region(i2c->iomem, i2c->iolen, DRIVER_NAME)) {
+ dev_err(&op->dev, "Memory region busy\n");
ret = -EBUSY;
goto request_mem_failed;
}
- i2c->base = ioremap(res->start, resource_size(res));
+ i2c->base = ioremap(i2c->iomem, i2c->iolen);
if (!i2c->base) {
- dev_err(&pdev->dev, "Unable to map registers\n");
+ dev_err(&op->dev, "Unable to map registers\n");
ret = -EIO;
goto map_failed;
}
/* hook up driver to tree */
- platform_set_drvdata(pdev, i2c);
+ dev_set_drvdata(&op->dev, i2c);
i2c->adap = xiic_adapter;
i2c_set_adapdata(&i2c->adap, i2c);
- i2c->adap.dev.parent = &pdev->dev;
+ i2c->adap.dev.parent = &op->dev;
xiic_reinit(i2c);
spin_lock_init(&i2c->lock);
init_waitqueue_head(&i2c->wait);
- ret = request_irq(irq, xiic_isr, 0, pdev->name, i2c);
+ ret = request_irq(i2c->irq, xiic_isr, 0, DRIVER_NAME, i2c);
if (ret) {
- dev_err(&pdev->dev, "Cannot claim IRQ\n");
+ dev_err(&op->dev, "Cannot claim IRQ\n");
goto request_irq_failed;
}
/* add i2c adapter to i2c tree */
+ i2c->adap.id=0;
ret = i2c_add_adapter(&i2c->adap);
if (ret) {
- dev_err(&pdev->dev, "Failed to add adapter\n");
+ dev_err(&op->dev, "Failed to add adapter\n");
goto add_adapter_failed;
}
- /* add in known devices to the bus */
- for (i = 0; i < pdata->num_devices; i++)
- i2c_new_device(&i2c->adap, pdata->devices + i);
+ of_register_i2c_devices(&i2c->adap, op->node);
return 0;
add_adapter_failed:
- free_irq(irq, i2c);
+ free_irq(i2c->irq, i2c);
request_irq_failed:
xiic_deinit(i2c);
iounmap(i2c->base);
map_failed:
- release_mem_region(res->start, resource_size(res));
+ release_mem_region(i2c->iomem, i2c->iolen);
request_mem_failed:
- kfree(i2c);
return ret;
resource_missing:
- dev_err(&pdev->dev, "IRQ or Memory resource is missing\n");
+ kfree(i2c);
+ dev_err(&op->dev, "IRQ or Memory resource is missing\n");
return -ENOENT;
}
-static int __devexit xiic_i2c_remove(struct platform_device* pdev)
+
+static int __devexit xiic_i2c_remove(struct of_device *op)
{
- struct xiic_i2c *i2c = platform_get_drvdata(pdev);
- struct resource *res;
+ struct xiic_i2c *i2c = dev_get_drvdata(&op->dev);
/* remove adapter & data */
i2c_del_adapter(&i2c->adap);
xiic_deinit(i2c);
- platform_set_drvdata(pdev, NULL);
+ dev_set_drvdata(&op->dev, NULL);
- free_irq(platform_get_irq(pdev, 0), i2c);
+ free_irq(i2c->irq, i2c);
iounmap(i2c->base);
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (res)
- release_mem_region(res->start, resource_size(res));
+ release_mem_region(i2c->iomem, i2c->iolen);
kfree(i2c);
return 0;
}
+/* Match table for of_platform binding */
+ static struct of_device_id __devinitdata xiic_match[] = {
+ { .compatible = "xlnx,xps-iic-2.00.a", },
+ {},
+ };
-/* work with hotplug and coldplug */
-MODULE_ALIAS("platform:"DRIVER_NAME);
+MODULE_DEVICE_TABLE(of, xiic_of_match);
-static struct platform_driver xiic_i2c_driver = {
+static struct of_platform_driver xiic_i2c_of_driver = {
+ .match_table = xiic_match,
.probe = xiic_i2c_probe,
.remove = __devexit_p(xiic_i2c_remove),
- .driver = {
+ .driver = {
.owner = THIS_MODULE,
.name = DRIVER_NAME,
},
@@ -810,12 +817,12 @@ static struct platform_driver xiic_i2c_driver = {
static int __init xiic_i2c_init(void)
{
- return platform_driver_register(&xiic_i2c_driver);
+ return of_register_platform_driver(&xiic_i2c_of_driver);
}
static void __exit xiic_i2c_exit(void)
{
- platform_driver_unregister(&xiic_i2c_driver);
+ of_unregister_platform_driver(&xiic_i2c_of_driver);
}
module_init(xiic_i2c_init);
--
1.7.1
--
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