mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 00:40:03 +00:00
![Russell King](/assets/img/avatar_default.png)
The correct way for a driver to specify the coherent DMA mask is not to directly access the field in the struct device, but to use dma_set_coherent_mask(). Only arch and bus code should access this member directly. Convert all direct write accesses to using the correct API. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
208 lines
5.4 KiB
C
208 lines
5.4 KiB
C
/*
|
|
* ixp4xx PATA/Compact Flash driver
|
|
* Copyright (C) 2006-07 Tower Technologies
|
|
* Author: Alessandro Zummo <a.zummo@towertech.it>
|
|
*
|
|
* An ATA driver to handle a Compact Flash connected
|
|
* to the ixp4xx expansion bus in TrueIDE mode. The CF
|
|
* must have it chip selects connected to two CS lines
|
|
* on the ixp4xx. In the irq is not available, you might
|
|
* want to modify both this driver and libata to run in
|
|
* polling mode.
|
|
*
|
|
* 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
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/libata.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/platform_device.h>
|
|
#include <scsi/scsi_host.h>
|
|
|
|
#define DRV_NAME "pata_ixp4xx_cf"
|
|
#define DRV_VERSION "0.2"
|
|
|
|
static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
|
|
{
|
|
struct ata_device *dev;
|
|
|
|
ata_for_each_dev(dev, link, ENABLED) {
|
|
ata_dev_info(dev, "configured for PIO0\n");
|
|
dev->pio_mode = XFER_PIO_0;
|
|
dev->xfer_mode = XFER_PIO_0;
|
|
dev->xfer_shift = ATA_SHIFT_PIO;
|
|
dev->flags |= ATA_DFLAG_PIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int ixp4xx_mmio_data_xfer(struct ata_device *dev,
|
|
unsigned char *buf, unsigned int buflen, int rw)
|
|
{
|
|
unsigned int i;
|
|
unsigned int words = buflen >> 1;
|
|
u16 *buf16 = (u16 *) buf;
|
|
struct ata_port *ap = dev->link->ap;
|
|
void __iomem *mmio = ap->ioaddr.data_addr;
|
|
struct ixp4xx_pata_data *data = dev_get_platdata(ap->host->dev);
|
|
|
|
/* set the expansion bus in 16bit mode and restore
|
|
* 8 bit mode after the transaction.
|
|
*/
|
|
*data->cs0_cfg &= ~(0x01);
|
|
udelay(100);
|
|
|
|
/* Transfer multiple of 2 bytes */
|
|
if (rw == READ)
|
|
for (i = 0; i < words; i++)
|
|
buf16[i] = readw(mmio);
|
|
else
|
|
for (i = 0; i < words; i++)
|
|
writew(buf16[i], mmio);
|
|
|
|
/* Transfer trailing 1 byte, if any. */
|
|
if (unlikely(buflen & 0x01)) {
|
|
u16 align_buf[1] = { 0 };
|
|
unsigned char *trailing_buf = buf + buflen - 1;
|
|
|
|
if (rw == READ) {
|
|
align_buf[0] = readw(mmio);
|
|
memcpy(trailing_buf, align_buf, 1);
|
|
} else {
|
|
memcpy(align_buf, trailing_buf, 1);
|
|
writew(align_buf[0], mmio);
|
|
}
|
|
words++;
|
|
}
|
|
|
|
udelay(100);
|
|
*data->cs0_cfg |= 0x01;
|
|
|
|
return words << 1;
|
|
}
|
|
|
|
static struct scsi_host_template ixp4xx_sht = {
|
|
ATA_PIO_SHT(DRV_NAME),
|
|
};
|
|
|
|
static struct ata_port_operations ixp4xx_port_ops = {
|
|
.inherits = &ata_sff_port_ops,
|
|
.sff_data_xfer = ixp4xx_mmio_data_xfer,
|
|
.cable_detect = ata_cable_40wire,
|
|
.set_mode = ixp4xx_set_mode,
|
|
};
|
|
|
|
static void ixp4xx_setup_port(struct ata_port *ap,
|
|
struct ixp4xx_pata_data *data,
|
|
unsigned long raw_cs0, unsigned long raw_cs1)
|
|
{
|
|
struct ata_ioports *ioaddr = &ap->ioaddr;
|
|
unsigned long raw_cmd = raw_cs0;
|
|
unsigned long raw_ctl = raw_cs1 + 0x06;
|
|
|
|
ioaddr->cmd_addr = data->cs0;
|
|
ioaddr->altstatus_addr = data->cs1 + 0x06;
|
|
ioaddr->ctl_addr = data->cs1 + 0x06;
|
|
|
|
ata_sff_std_ports(ioaddr);
|
|
|
|
#ifndef __ARMEB__
|
|
|
|
/* adjust the addresses to handle the address swizzling of the
|
|
* ixp4xx in little endian mode.
|
|
*/
|
|
|
|
*(unsigned long *)&ioaddr->data_addr ^= 0x02;
|
|
*(unsigned long *)&ioaddr->cmd_addr ^= 0x03;
|
|
*(unsigned long *)&ioaddr->altstatus_addr ^= 0x03;
|
|
*(unsigned long *)&ioaddr->ctl_addr ^= 0x03;
|
|
*(unsigned long *)&ioaddr->error_addr ^= 0x03;
|
|
*(unsigned long *)&ioaddr->feature_addr ^= 0x03;
|
|
*(unsigned long *)&ioaddr->nsect_addr ^= 0x03;
|
|
*(unsigned long *)&ioaddr->lbal_addr ^= 0x03;
|
|
*(unsigned long *)&ioaddr->lbam_addr ^= 0x03;
|
|
*(unsigned long *)&ioaddr->lbah_addr ^= 0x03;
|
|
*(unsigned long *)&ioaddr->device_addr ^= 0x03;
|
|
*(unsigned long *)&ioaddr->status_addr ^= 0x03;
|
|
*(unsigned long *)&ioaddr->command_addr ^= 0x03;
|
|
|
|
raw_cmd ^= 0x03;
|
|
raw_ctl ^= 0x03;
|
|
#endif
|
|
|
|
ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
|
|
}
|
|
|
|
static int ixp4xx_pata_probe(struct platform_device *pdev)
|
|
{
|
|
unsigned int irq;
|
|
struct resource *cs0, *cs1;
|
|
struct ata_host *host;
|
|
struct ata_port *ap;
|
|
struct ixp4xx_pata_data *data = dev_get_platdata(&pdev->dev);
|
|
int ret;
|
|
|
|
cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
|
|
if (!cs0 || !cs1)
|
|
return -EINVAL;
|
|
|
|
/* allocate host */
|
|
host = ata_host_alloc(&pdev->dev, 1);
|
|
if (!host)
|
|
return -ENOMEM;
|
|
|
|
/* acquire resources and fill host */
|
|
ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
|
|
if (ret)
|
|
return ret;
|
|
|
|
data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
|
|
data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
|
|
|
|
if (!data->cs0 || !data->cs1)
|
|
return -ENOMEM;
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq)
|
|
irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
|
|
|
|
/* Setup expansion bus chip selects */
|
|
*data->cs0_cfg = data->cs0_bits;
|
|
*data->cs1_cfg = data->cs1_bits;
|
|
|
|
ap = host->ports[0];
|
|
|
|
ap->ops = &ixp4xx_port_ops;
|
|
ap->pio_mask = ATA_PIO4;
|
|
ap->flags |= ATA_FLAG_NO_ATAPI;
|
|
|
|
ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
|
|
|
|
ata_print_version_once(&pdev->dev, DRV_VERSION);
|
|
|
|
/* activate host */
|
|
return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
|
|
}
|
|
|
|
static struct platform_driver ixp4xx_pata_platform_driver = {
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ixp4xx_pata_probe,
|
|
.remove = ata_platform_remove_one,
|
|
};
|
|
|
|
module_platform_driver(ixp4xx_pata_platform_driver);
|
|
|
|
MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
|
|
MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(DRV_VERSION);
|
|
MODULE_ALIAS("platform:" DRV_NAME);
|