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pata_of_platform.c
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pata_of_platform.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* OF-platform PATA driver
*
* Copyright (c) 2007 MontaVista Software, Inc.
* Anton Vorontsov <[email protected]>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/ata_platform.h>
#include <linux/libata.h>
#define DRV_NAME "pata_of_platform"
static const struct scsi_host_template pata_platform_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static int pata_of_platform_probe(struct platform_device *ofdev)
{
int ret;
struct device_node *dn = ofdev->dev.of_node;
struct resource io_res;
struct resource ctl_res;
struct resource irq_res;
unsigned int reg_shift = 0;
int pio_mode = 0;
int pio_mask;
bool use16bit;
int irq;
ret = of_address_to_resource(dn, 0, &io_res);
if (ret) {
dev_err(&ofdev->dev, "can't get IO address from "
"device tree\n");
return -EINVAL;
}
ret = of_address_to_resource(dn, 1, &ctl_res);
if (ret) {
dev_err(&ofdev->dev, "can't get CTL address from "
"device tree\n");
return -EINVAL;
}
memset(&irq_res, 0, sizeof(irq_res));
irq = platform_get_irq_optional(ofdev, 0);
if (irq < 0 && irq != -ENXIO)
return irq;
if (irq > 0) {
irq_res.start = irq;
irq_res.end = irq;
}
of_property_read_u32(dn, "reg-shift", ®_shift);
if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
if (pio_mode > 6) {
dev_err(&ofdev->dev, "invalid pio-mode\n");
return -EINVAL;
}
} else {
dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
}
use16bit = of_property_read_bool(dn, "ata-generic,use16bit");
pio_mask = 1 << pio_mode;
pio_mask |= (1 << pio_mode) - 1;
return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq > 0 ? &irq_res : NULL,
reg_shift, pio_mask, &pata_platform_sht,
use16bit);
}
static const struct of_device_id pata_of_platform_match[] = {
{ .compatible = "ata-generic", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, pata_of_platform_match);
static struct platform_driver pata_of_platform_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = pata_of_platform_match,
},
.probe = pata_of_platform_probe,
.remove_new = ata_platform_remove_one,
};
module_platform_driver(pata_of_platform_driver);
MODULE_DESCRIPTION("OF-platform PATA driver");
MODULE_AUTHOR("Anton Vorontsov <[email protected]>");
MODULE_LICENSE("GPL");