linux/drivers/ata/pata_platform.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

264 lines
7.2 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 "1.1"
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_link *link, struct ata_device **unused)
{
struct ata_device *dev;
ata_link_for_each_dev(dev, link) {
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 int ata_dummy_ret0(struct ata_port *ap) { 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,
.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,
.cable_detect = ata_cable_unknown,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.data_xfer = ata_data_xfer_noirq,
.irq_clear = ata_bmdma_irq_clear,
.irq_on = ata_irq_on,
.port_start = ata_dummy_ret0,
};
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_host *host;
struct ata_port *ap;
struct pata_platform_info *pp_info;
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..
*/
host = ata_host_alloc(&pdev->dev, 1);
if (!host)
return -ENOMEM;
ap = host->ports[0];
ap->ops = &pata_platform_port_ops;
ap->pio_mask = pio_mask;
ap->flags |= ATA_FLAG_SLAVE_POSS;
/*
* Handle the MMIO case
*/
if (mmio) {
ap->ioaddr.cmd_addr = devm_ioremap(&pdev->dev, io_res->start,
io_res->end - io_res->start + 1);
ap->ioaddr.ctl_addr = devm_ioremap(&pdev->dev, ctl_res->start,
ctl_res->end - ctl_res->start + 1);
} else {
ap->ioaddr.cmd_addr = devm_ioport_map(&pdev->dev, io_res->start,
io_res->end - io_res->start + 1);
ap->ioaddr.ctl_addr = devm_ioport_map(&pdev->dev, ctl_res->start,
ctl_res->end - ctl_res->start + 1);
}
if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
dev_err(&pdev->dev, "failed to map IO/CTL base\n");
return -ENOMEM;
}
ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
pp_info = pdev->dev.platform_data;
pata_platform_setup_port(&ap->ioaddr, pp_info);
ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
(unsigned long long)io_res->start,
(unsigned long long)ctl_res->start);
/* activate */
return ata_host_activate(host, platform_get_irq(pdev, 0),
ata_interrupt, pp_info ? pp_info->irq_flags
: 0, &pata_platform_sht);
}
/**
* 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);