/*
* Generic platform device PATA driver
*
* Copyright (C) 2006 Paul Mundt
*
* Based on pata_pcmcia:
*
* Copyright 2005-2006 Red Hat Inc <alan@redhat.com>, all rights reserved.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <scsi/scsi_host.h>
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/platform_device.h>
#include <linux/pata_platform.h>
#define DRV_NAME "pata_platform"
#define DRV_VERSION "0.1.2"
static int pio_mask = 1;
/*
* Provide our own set_mode() as we don't want to change anything that has
* already been configured..
*/
static void pata_platform_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)) {
/* We don't really care */
dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
dev->xfer_shift = ATA_SHIFT_PIO;
dev->flags |= ATA_DFLAG_PIO;
}
}
}
static void pata_platform_host_stop(struct ata_host *host)
{
int i;
/*
* Unmap the bases for MMIO
*/
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];
if (ap->flags & ATA_FLAG_MMIO) {
iounmap((void __iomem *)ap->ioaddr.ctl_addr);
iounmap((void __iomem *)ap->ioaddr.cmd_addr);
}
}
}
static struct scsi_host_template pata_platform_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 pata_platform_port_ops = {
.set_mode = pata_platform_set_mode,
.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,
.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 = ata_pio_data_xfer_noirq,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.port_start = ata_port_start,
.port_stop = ata_port_stop,
.host_stop = pata_platform_host_stop
};
static void pata_platform_setup_port(struct ata_ioports *ioaddr,
struct pata_platform_info *info)
{
unsigned int shift = 0;
/* Fixup the port shift for platforms that need it */
if (info && info->ioport_shift)
shift = info->ioport_shift;
ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift);
ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift);
ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift);
ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift);
ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift);
ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift);
ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift);
ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift);
ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift);
}
/**
* pata_platform_probe - attach a platform interface
* @pdev: platform device
*
* Register a platform bus IDE interface. Such interfaces are PIO and we
* assume do not support IRQ sharing.
*
* Platform devices are expected to contain 3 resources per port:
*
* - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
* - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
* - IRQ (IORESOURCE_IRQ)
*
* If the base resources are both mem types, the ioremap() is handled
* here. For IORESOURCE_IO, it's assumed that there's no remapping
* necessary.
*/
static int __devinit pata_platform_probe(struct platform_device *pdev)
{
struct resource *io_res, *ctl_res;
struct ata_probe_ent ae;
unsigned int mmio;
int ret;
/*
* Simple resource validation ..
*/
if (unlikely(pdev->num_resources != 3)) {
dev_err(&pdev->dev, "invalid number of resources\n");
return -EINVAL;
}
/*
* Get the I/O base first
*/
io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (io_res == NULL) {
io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (unlikely(io_res == NULL))
return -EINVAL;
}
/*
* Then the CTL base
*/
ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
if (ctl_res == NULL) {
ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (unlikely(ctl_res == NULL))
return -EINVAL;
}
/*
* Check for MMIO
*/
mmio = (( io_res->flags == IORESOURCE_MEM) &&
(ctl_res->flags == IORESOURCE_MEM));
/*
* Now that that's out of the way, wire up the port..
*/
memset(&ae, 0, sizeof(struct ata_probe_ent));
INIT_LIST_HEAD(&ae.node);
ae.dev = &pdev->dev;
ae.port_ops = &pata_platform_port_ops;
ae.sht = &pata_platform_sht;
ae.n_ports = 1;
ae.pio_mask = pio_mask;
ae.irq = platform_get_irq(pdev, 0);
ae.irq_flags = 0;
ae.port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST;
/*
* Handle the MMIO case
*/
if (mmio) {
ae.port_flags |= ATA_FLAG_MMIO;
ae.port[0].cmd_addr = (unsigned long)ioremap(io_res->start,
io_res->end - io_res->start + 1);
if (unlikely(!ae.port[0].cmd_addr)) {
dev_err(&pdev->dev, "failed to remap IO base\n");
return -ENXIO;
}
ae.port[0].ctl_addr = (unsigned long)ioremap(ctl_res->start,
ctl_res->end - ctl_res->start + 1);
if (unlikely(!ae.port[0].ctl_addr)) {
dev_err(&pdev->dev, "failed to remap CTL base\n");
ret = -ENXIO;
goto bad_remap;
}
} else {
ae.port[0].cmd_addr = io_res->start;
ae.port[0].ctl_addr = ctl_res->start;
}
ae.port[0].altstatus_addr = ae.port[0].ctl_addr;
pata_platform_setup_port(&ae.port[0], pdev->dev.platform_data);
if (unlikely(ata_device_add(&ae) == 0)) {
ret = -ENODEV;
goto add_failed;
}
return 0;
add_failed:
if (ae.port[0].ctl_addr && mmio)
iounmap((void __iomem *)ae.port[0].ctl_addr);
bad_remap:
if (ae.port[0].cmd_addr && mmio)
iounmap((void __iomem *)ae.port[0].cmd_addr);
return ret;
}
/**
* pata_platform_remove - unplug a platform interface
* @pdev: platform device
*
* A platform bus ATA device has been unplugged. Perform the needed
* cleanup. Also called on module unload for any active devices.
*/
static int __devexit pata_platform_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ata_host *host = dev_get_drvdata(dev);
ata_host_remove(host);
dev_set_drvdata(dev, NULL);
return 0;
}
static struct platform_driver pata_platform_driver = {
.probe = pata_platform_probe,
.remove = __devexit_p(pata_platform_remove),
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
};
static int __init pata_platform_init(void)
{
return platform_driver_register(&pata_platform_driver);
}
static void __exit pata_platform_exit(void)
{
platform_driver_unregister(&pata_platform_driver);
}
module_init(pata_platform_init);
module_exit(pata_platform_exit);
module_param(pio_mask, int, 0);
MODULE_AUTHOR("Paul Mundt");
MODULE_DESCRIPTION("low-level driver for platform device ATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
