1aa56cca5b
Clearing drvdata in ->remove_one causes NULL pointer deference. Clear drvdata only in ata_host_release() after all resources are freed. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
262 lines
7.0 KiB
C
262 lines
7.0 KiB
C
/*
|
|
* 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 int pata_platform_set_mode(struct ata_port *ap, struct ata_device **unused)
|
|
{
|
|
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;
|
|
ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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_data_xfer_noirq,
|
|
|
|
.irq_handler = ata_interrupt,
|
|
.irq_clear = ata_bmdma_irq_clear,
|
|
.irq_on = ata_irq_on,
|
|
.irq_ack = ata_irq_ack,
|
|
|
|
.port_start = ata_port_start,
|
|
};
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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[0].cmd_addr = devm_ioremap(&pdev->dev, io_res->start,
|
|
io_res->end - io_res->start + 1);
|
|
ae.port[0].ctl_addr = devm_ioremap(&pdev->dev, ctl_res->start,
|
|
ctl_res->end - ctl_res->start + 1);
|
|
} else {
|
|
ae.port[0].cmd_addr = devm_ioport_map(&pdev->dev, io_res->start,
|
|
io_res->end - io_res->start + 1);
|
|
ae.port[0].ctl_addr = devm_ioport_map(&pdev->dev, ctl_res->start,
|
|
ctl_res->end - ctl_res->start + 1);
|
|
}
|
|
if (!ae.port[0].cmd_addr || !ae.port[0].ctl_addr) {
|
|
dev_err(&pdev->dev, "failed to map IO/CTL base\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
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))
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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_detach(host);
|
|
|
|
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);
|