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linux/drivers/ata/pata_ixp4xx_cf.c
Tejun Heo cbcdd87593 libata: implement and use ata_port_desc() to report port configuration 
Currently, port configuration reporting has the following problems.

* iomapped address is reported instead of raw address
* report contains irrelevant fields or lacks necessary fields for
  non-SFF controllers.
* host->irq/irq2 are there just for reporting and hacky.

This patch implements and uses ata_port_desc() and
ata_port_pbar_desc().  ata_port_desc() is almost identical to
ata_ehi_push_desc() except that it takes @ap instead of @ehi, has no
locking requirement, can only be used during host initialization and "
" is used as separator instead of ", ".  ata_port_pbar_desc() is a
helper to ease reporting of a PCI BAR or an offsetted address into it.

LLD pushes whatever description it wants using the above two
functions.  The accumulated description is printed on host
registration after "[S/P]ATA max MAX_XFERMODE ".

SFF init helpers and ata_host_activate() automatically add
descriptions for addresses and irq respectively, so only LLDs which
isn't standard SFF need to add custom descriptions.  In many cases,
such controllers need to report different things anyway.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-10-12 14:55:37 -04:00

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/*
* 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_link_for_each_dev(dev, link) {
if (ata_dev_enabled(dev)) {
ata_dev_printk(dev, KERN_INFO, "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 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->link->ap;
void __iomem *mmio = 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 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,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.exec_command = ata_exec_command,
.check_status = ata_check_status,
.dev_select = ata_std_dev_select,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = ata_bmdma_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.data_xfer = ixp4xx_mmio_data_xfer,
.cable_detect = ata_cable_40wire,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.irq_on = ata_irq_on,
.port_start = ata_port_start,
};
static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
struct ixp4xx_pata_data *data,
unsigned long raw_cs0, unsigned long raw_cs1)
{
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_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 __devinit 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 = 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;
/* allocate host */
host = ata_host_alloc(&pdev->dev, 1);
if (!host)
return -ENOMEM;
/* acquire resources and fill host */
pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
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)
set_irq_type(irq, IRQT_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 = 0x1f; /* PIO4 */
ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
/* activate host */
return ata_host_activate(host, irq, ata_interrupt, 0, &ixp4xx_sht);
}
static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
{
struct ata_host *host = platform_get_drvdata(dev);
ata_host_detach(host);
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);
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