/*
* ixp4xx PATA/Compact Flash driver
* Copyright (c) 2006 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. The interrupt line is optional, if not
* specified the driver will 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 "0.1.1"
static void ixp4xx_set_mode(struct ata_port *ap)
{
int i;
for (i = 0; i < ATA_MAX_DEVICES; i++) {
struct ata_device *dev = &ap->device[i];
if (ata_dev_enabled(dev)) {
dev->pio_mode = XFER_PIO_0;
dev->xfer_mode = XFER_PIO_0;
dev->xfer_shift = ATA_SHIFT_PIO;
dev->flags |= ATA_DFLAG_PIO;
}
}
}
static void ixp4xx_phy_reset(struct ata_port *ap)
{
ap->cbl = ATA_CBL_PATA40;
ata_port_probe(ap);
ata_bus_reset(ap);
}
static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
unsigned int buflen, int write_data)
{
unsigned int i;
unsigned int words = buflen >> 1;
u16 *buf16 = (u16 *) buf;
struct ata_port *ap = adev->ap;
void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
/* 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 (write_data) {
for (i = 0; i < words; i++)
writew(buf16[i], mmio);
} else {
for (i = 0; i < words; i++)
buf16[i] = readw(mmio);
}
/* Transfer trailing 1 byte, if any. */
if (unlikely(buflen & 0x01)) {
u16 align_buf[1] = { 0 };
unsigned char *trailing_buf = buf + buflen - 1;
if (write_data) {
memcpy(align_buf, trailing_buf, 1);
writew(align_buf[0], mmio);
} else {
align_buf[0] = readw(mmio);
memcpy(trailing_buf, align_buf, 1);
}
}
udelay(100);
*data->cs0_cfg |= 0x01;
}
static void ixp4xx_irq_clear(struct ata_port *ap)
{
}
static void ixp4xx_host_stop (struct ata_host *host)
{
struct ixp4xx_pata_data *data = host->dev->platform_data;
iounmap(data->cs0);
iounmap(data->cs1);
}
static struct scsi_host_template ixp4xx_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
.ioctl = ata_scsi_ioctl,
.queuecommand = ata_scsi_queuecmd,
.can_queue = ATA_DEF_QUEUE,
.this_id = ATA_SHT_THIS_ID,
.sg_tablesize = LIBATA_MAX_PRD,
.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
.emulated = ATA_SHT_EMULATED,
.use_clustering = ATA_SHT_USE_CLUSTERING,
.proc_name = DRV_NAME,
.dma_boundary = ATA_DMA_BOUNDARY,
.slave_configure = ata_scsi_slave_config,
.slave_destroy = ata_scsi_slave_destroy,
.bios_param = ata_std_bios_param,
};
static struct ata_port_operations ixp4xx_port_ops = {
.set_mode = ixp4xx_set_mode,
.mode_filter = ata_pci_default_filter,
.port_disable = ata_port_disable,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.eng_timeout = ata_eng_timeout,
.data_xfer = ixp4xx_mmio_data_xfer,
.irq_handler = ata_interrupt,
.irq_clear = ixp4xx_irq_clear,
.port_start = ata_port_start,
.port_stop = ata_port_stop,
.host_stop = ixp4xx_host_stop,
.phy_reset = ixp4xx_phy_reset,
};
static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
struct ixp4xx_pata_data *data)
{
ioaddr->cmd_addr = (unsigned long) data->cs0;
ioaddr->altstatus_addr = (unsigned long) data->cs1 + 0x06;
ioaddr->ctl_addr = (unsigned long) data->cs1 + 0x06;
ata_std_ports(ioaddr);
#ifndef __ARMEB__
/* adjust the addresses to handle the address swizzling of the
* ixp4xx in little endian mode.
*/
ioaddr->data_addr ^= 0x02;
ioaddr->cmd_addr ^= 0x03;
ioaddr->altstatus_addr ^= 0x03;
ioaddr->ctl_addr ^= 0x03;
ioaddr->error_addr ^= 0x03;
ioaddr->feature_addr ^= 0x03;
ioaddr->nsect_addr ^= 0x03;
ioaddr->lbal_addr ^= 0x03;
ioaddr->lbam_addr ^= 0x03;
ioaddr->lbah_addr ^= 0x03;
ioaddr->device_addr ^= 0x03;
ioaddr->status_addr ^= 0x03;
ioaddr->command_addr ^= 0x03;
#endif
}
static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
{
int ret;
unsigned int irq;
struct resource *cs0, *cs1;
struct ata_probe_ent ae;
struct ixp4xx_pata_data *data = pdev->dev.platform_data;
cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!cs0 || !cs1)
return -EINVAL;
pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
data->cs0 = ioremap(cs0->start, 0x1000);
data->cs1 = ioremap(cs1->start, 0x1000);
irq = platform_get_irq(pdev, 0);
if (irq)
set_irq_type(irq, IRQT_HIGH);
/* Setup expansion bus chip selects */
*data->cs0_cfg = data->cs0_bits;
*data->cs1_cfg = data->cs1_bits;
memset(&ae, 0, sizeof(struct ata_probe_ent));
INIT_LIST_HEAD(&ae.node);
ae.dev = &pdev->dev;
ae.port_ops = &ixp4xx_port_ops;
ae.sht = &ixp4xx_sht;
ae.n_ports = 1;
ae.pio_mask = 0x1f; /* PIO4 */
ae.irq = irq;
ae.irq_flags = 0;
ae.port_flags = ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY
| ATA_FLAG_NO_ATAPI | ATA_FLAG_SRST;
/* run in polling mode if no irq has been assigned */
if (!irq)
ae.port_flags |= ATA_FLAG_PIO_POLLING;
ixp4xx_setup_port(&ae.port[0], data);
dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
ret = ata_device_add(&ae);
if (ret == 0)
return -ENODEV;
return 0;
}
static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
{
struct ata_host *host = platform_get_drvdata(dev);
ata_host_remove(host);
platform_set_drvdata(dev, NULL);
return 0;
}
static struct platform_driver ixp4xx_pata_platform_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
.probe = ixp4xx_pata_probe,
.remove = __devexit_p(ixp4xx_pata_remove),
};
static int __init ixp4xx_pata_init(void)
{
return platform_driver_register(&ixp4xx_pata_platform_driver);
}
static void __exit ixp4xx_pata_exit(void)
{
platform_driver_unregister(&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_init(ixp4xx_pata_init);
module_exit(ixp4xx_pata_exit);
