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Xilinx: SPI: updated driver for device tree 

The driver was updated to use the device tree rather than the platform data.

Signed-off-by: John Linn <john.linn@xilinx.com>
This commit is contained in:
John Linn 2009-01-09 16:01:53 -07:00 committed by Grant Likely
parent 2526c151c3
commit ff82c587a9
1 changed files with 81 additions and 56 deletions
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137
drivers/spi/xilinx_spi.c
View File

@ -15,12 +15,15 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h>
#include <linux/of_device.h>
#include <linux/of_spi.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
#include <linux/io.h>
#include <syslib/virtex_devices.h>
#define XILINX_SPI_NAME "xilinx_spi"
/* Register definitions as per "OPB Serial Peripheral Interface (SPI) (v1.00e)
@ -144,23 +147,14 @@ static int xilinx_spi_setup_transfer(struct spi_device *spi,
struct spi_transfer *t)
{
u8 bits_per_word;
u32 hz;
struct xilinx_spi *xspi = spi_master_get_devdata(spi->master);
bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word;
hz = (t) ? t->speed_hz : spi->max_speed_hz;
if (bits_per_word != 8) {
dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n",
__func__, bits_per_word);
return -EINVAL;
}
if (hz && xspi->speed_hz > hz) {
dev_err(&spi->dev, "%s, unsupported clock rate %uHz\n",
__func__, hz);
return -EINVAL;
}
return 0;
}
@ -304,32 +298,38 @@ static irqreturn_t xilinx_spi_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
static int __init xilinx_spi_probe(struct platform_device *dev)
static int __init xilinx_spi_of_probe(struct of_device *ofdev,
const struct of_device_id *match)
{
int ret = 0;
struct spi_master *master;
struct xilinx_spi *xspi;
struct xspi_platform_data *pdata;
struct resource *r;
struct resource r_irq_struct;
struct resource r_mem_struct;
struct resource *r_irq = &r_irq_struct;
struct resource *r_mem = &r_mem_struct;
int rc = 0;
const u32 *prop;
int len;
/* Get resources(memory, IRQ) associated with the device */
master = spi_alloc_master(&dev->dev, sizeof(struct xilinx_spi));
master = spi_alloc_master(&ofdev->dev, sizeof(struct xilinx_spi));
if (master == NULL) {
return -ENOMEM;
}
platform_set_drvdata(dev, master);
pdata = dev->dev.platform_data;
dev_set_drvdata(&ofdev->dev, master);
if (pdata == NULL) {
ret = -ENODEV;
rc = of_address_to_resource(ofdev->node, 0, r_mem);
if (rc) {
dev_warn(&ofdev->dev, "invalid address\n");
goto put_master;
}
r = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (r == NULL) {
ret = -ENODEV;
rc = of_irq_to_resource(ofdev->node, 0, r_irq);
if (rc == NO_IRQ) {
dev_warn(&ofdev->dev, "no IRQ found\n");
goto put_master;
}
@ -341,47 +341,57 @@ static int __init xilinx_spi_probe(struct platform_device *dev)
xspi->bitbang.master->setup = xilinx_spi_setup;
init_completion(&xspi->done);
if (!request_mem_region(r->start,
r->end - r->start + 1, XILINX_SPI_NAME)) {
ret = -ENXIO;
xspi->irq = r_irq->start;
if (!request_mem_region(r_mem->start,
r_mem->end - r_mem->start + 1, XILINX_SPI_NAME)) {
rc = -ENXIO;
dev_warn(&ofdev->dev, "memory request failure\n");
goto put_master;
}
xspi->regs = ioremap(r->start, r->end - r->start + 1);
xspi->regs = ioremap(r_mem->start, r_mem->end - r_mem->start + 1);
if (xspi->regs == NULL) {
ret = -ENOMEM;
rc = -ENOMEM;
dev_warn(&ofdev->dev, "ioremap failure\n");
goto put_master;
}
xspi->irq = r_irq->start;
ret = platform_get_irq(dev, 0);
if (ret < 0) {
ret = -ENXIO;
goto unmap_io;
/* dynamic bus assignment */
master->bus_num = -1;
/* number of slave select bits is required */
prop = of_get_property(ofdev->node, "xlnx,num-ss-bits", &len);
if (!prop || len < sizeof(*prop)) {
dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n");
goto put_master;
}
xspi->irq = ret;
master->bus_num = pdata->bus_num;
master->num_chipselect = pdata->num_chipselect;
xspi->speed_hz = pdata->speed_hz;
master->num_chipselect = *prop;
/* SPI controller initializations */
xspi_init_hw(xspi->regs);
/* Register for SPI Interrupt */
ret = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi);
if (ret != 0)
rc = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi);
if (rc != 0) {
dev_warn(&ofdev->dev, "irq request failure: %d\n", xspi->irq);
goto unmap_io;
}
ret = spi_bitbang_start(&xspi->bitbang);
if (ret != 0) {
dev_err(&dev->dev, "spi_bitbang_start FAILED\n");
rc = spi_bitbang_start(&xspi->bitbang);
if (rc != 0) {
dev_err(&ofdev->dev, "spi_bitbang_start FAILED\n");
goto free_irq;
}
dev_info(&dev->dev, "at 0x%08X mapped to 0x%08X, irq=%d\n",
r->start, (u32)xspi->regs, xspi->irq);
dev_info(&ofdev->dev, "at 0x%08X mapped to 0x%08X, irq=%d\n",
(unsigned int)r_mem->start, (u32)xspi->regs, xspi->irq);
return ret;
/* Add any subnodes on the SPI bus */
of_register_spi_devices(master, ofdev->node);
return rc;
free_irq:
free_irq(xspi->irq, xspi);
@ -389,21 +399,21 @@ unmap_io:
iounmap(xspi->regs);
put_master:
spi_master_put(master);
return ret;
return rc;
}
static int __devexit xilinx_spi_remove(struct platform_device *dev)
static int __devexit xilinx_spi_remove(struct of_device *ofdev)
{
struct xilinx_spi *xspi;
struct spi_master *master;
master = platform_get_drvdata(dev);
master = platform_get_drvdata(ofdev);
xspi = spi_master_get_devdata(master);
spi_bitbang_stop(&xspi->bitbang);
free_irq(xspi->irq, xspi);
iounmap(xspi->regs);
platform_set_drvdata(dev, 0);
dev_set_drvdata(&ofdev->dev, 0);
spi_master_put(xspi->bitbang.master);
return 0;
@ -412,27 +422,42 @@ static int __devexit xilinx_spi_remove(struct platform_device *dev)
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:" XILINX_SPI_NAME);
static struct platform_driver xilinx_spi_driver = {
.probe = xilinx_spi_probe,
.remove = __devexit_p(xilinx_spi_remove),
static int __exit xilinx_spi_of_remove(struct of_device *op)
{
return xilinx_spi_remove(op);
}
static struct of_device_id xilinx_spi_of_match[] = {
{ .compatible = "xlnx,xps-spi-2.00.a", },
{ .compatible = "xlnx,xps-spi-2.00.b", },
{}
};
MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);
static struct of_platform_driver xilinx_spi_of_driver = {
.owner = THIS_MODULE,
.name = "xilinx-xps-spi",
.match_table = xilinx_spi_of_match,
.probe = xilinx_spi_of_probe,
.remove = __exit_p(xilinx_spi_of_remove),
.driver = {
.name = XILINX_SPI_NAME,
.name = "xilinx-xps-spi",
.owner = THIS_MODULE,
},
};
static int __init xilinx_spi_init(void)
{
return platform_driver_register(&xilinx_spi_driver);
return of_register_platform_driver(&xilinx_spi_of_driver);
}
module_init(xilinx_spi_init);
static void __exit xilinx_spi_exit(void)
{
platform_driver_unregister(&xilinx_spi_driver);
of_unregister_platform_driver(&xilinx_spi_of_driver);
}
module_exit(xilinx_spi_exit);
MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
MODULE_DESCRIPTION("Xilinx SPI driver");
MODULE_LICENSE("GPL");