mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Lad Prabhakar](/assets/img/avatar_default.png)
Make use of platform_get_mem_or_io() to simplify the code. While at it, drop use of unlikely() from pata_platform_probe() as it isn't a hotpath. Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru> Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
238 lines
6.5 KiB
C
238 lines
6.5 KiB
C
/*
|
|
* 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 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,
|
|
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 = 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);
|