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/*
* Generic platform device PATA driver
*
* Copyright (C) 2006 - 2007 Paul Mundt
*
* Based on pata_pcmcia:
*
* Copyright 2005-2006 Red Hat Inc, 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/blkdev.h>
#include <scsi/scsi_host.h>
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/platform_device.h>
#include <linux/ata_platform.h>
#define DRV_NAME "pata_platform"
#define DRV_VERSION "1.2"
static int pio_mask = 1;
module_param(pio_mask, int, 0);
MODULE_PARM_DESC(pio_mask, "PIO modes supported, mode 0 only by default");
/*
* 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_for_each_dev(dev, link, ENABLED) {
/* 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_info(dev, "configured for PIO\n");
}
return 0;
}
static const struct scsi_host_template pata_platform_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static void pata_platform_setup_port(struct ata_ioports *ioaddr,
unsigned int shift)
{
/* Fixup the port shift for platforms that need it */
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
* @dev: device
* @io_res: Resource representing I/O base
* @ctl_res: Resource representing CTL base
* @irq_res: Resource representing IRQ and its flags
* @ioport_shift: I/O port shift
* @__pio_mask: PIO mask
* @sht: scsi_host_template to use when registering
* @use16bit: Flag to indicate 16-bit IO instead of 32-bit
*
* Register a platform bus IDE interface. Such interfaces are PIO and we
* assume do not support IRQ sharing.
*
* Platform devices are expected to contain at least 2 resources per port:
*
* - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
* - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
*
* and optionally:
*
* - 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.
*
* If no IRQ resource is present, PIO polling mode is used instead.
*/
int __pata_platform_probe(struct device *dev, struct resource *io_res,
struct resource *ctl_res, struct resource *irq_res,
unsigned int ioport_shift, int __pio_mask,
const struct scsi_host_template *sht, bool use16bit)
{
struct ata_host *host;
struct ata_port *ap;
unsigned int mmio;
int irq = 0;
int irq_flags = 0;
/*
* Check for MMIO
*/
mmio = (( io_res->flags == IORESOURCE_MEM) &&
(ctl_res->flags == IORESOURCE_MEM));
/*
* And the IRQ
*/
if (irq_res && irq_res->start > 0) {
irq = irq_res->start;
irq_flags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;
}
/*
* Now that that's out of the way, wire up the port..
*/
host = ata_host_alloc(dev, 1);
if (!host)
return -ENOMEM;
ap = host->ports[0];
ap->ops = devm_kzalloc(dev, sizeof(*ap->ops), GFP_KERNEL);
if (!ap->ops)
return -ENOMEM;
ap->ops->inherits = &ata_sff_port_ops;
ap->ops->cable_detect = ata_cable_unknown;
ap->ops->set_mode = pata_platform_set_mode;
if (use16bit)
ap->ops->sff_data_xfer = ata_sff_data_xfer;
else
ap->ops->sff_data_xfer = ata_sff_data_xfer32;
ap->pio_mask = __pio_mask;
ap->flags |= ATA_FLAG_SLAVE_POSS;
/*
* Use polling mode if there's no IRQ
*/
if (!irq) {
ap->flags |= ATA_FLAG_PIO_POLLING;
ata_port_desc(ap, "no IRQ, using PIO polling");
}
/*
* Handle the MMIO case
*/
if (mmio) {
ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
resource_size(io_res));
ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
resource_size(ctl_res));
} else {
ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
resource_size(io_res));
ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
resource_size(ctl_res));
}
if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
dev_err(dev, "failed to map IO/CTL base\n");
return -ENOMEM;
}
ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
pata_platform_setup_port(&ap->ioaddr, ioport_shift);
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, irq, irq ? ata_sff_interrupt : NULL,
irq_flags, sht);
}
EXPORT_SYMBOL_GPL(__pata_platform_probe);
static int pata_platform_probe(struct platform_device *pdev)
{
struct resource *io_res;
struct resource *ctl_res;
struct resource *irq_res;
struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);
/*
* Simple resource validation ..
*/
if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
dev_err(&pdev->dev, "invalid number of resources\n");
return -EINVAL;
}
/*
* Get the I/O base first
*/
io_res = platform_get_mem_or_io(pdev, 0);
if (!io_res)
return -EINVAL;
/*
* Then the CTL base
*/
ctl_res = platform_get_mem_or_io(pdev, 1);
if (!ctl_res)
return -EINVAL;
/*
* And the IRQ
*/
irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
pp_info ? pp_info->ioport_shift : 0,
pio_mask, &pata_platform_sht, false);
}
static struct platform_driver pata_platform_driver = {
.probe = pata_platform_probe,
.remove_new = ata_platform_remove_one,
.driver = {
.name = DRV_NAME,
},
};
module_platform_driver(pata_platform_driver);
MODULE_AUTHOR("Paul Mundt");
MODULE_DESCRIPTION("low-level driver for platform device ATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_ALIAS("platform:" DRV_NAME);
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