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linux/drivers/ata/pata_falcon.c
Uwe Kleine-König 47d4708dfa ata: pata_falcon: Convert to platform remove callback returning void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Reviewed-by: Niklas Cassel <niklas.cassel@wdc.com>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
2023-11-08 09:00:44 +09:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Atari Falcon PATA controller driver
*
* Copyright (c) 2016 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Based on falconide.c:
*
* Created 12 Jul 1997 by Geert Uytterhoeven
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <asm/setup.h>
#include <asm/atarihw.h>
#include <asm/atariints.h>
#include <asm/atari_stdma.h>
#define DRV_NAME "pata_falcon"
#define DRV_VERSION "0.1.0"
static int pata_falcon_swap_mask;
module_param_named(data_swab, pata_falcon_swap_mask, int, 0444);
MODULE_PARM_DESC(data_swab, "Data byte swap enable/disable bitmap (0x1==drive1, 0x2==drive2, 0x4==drive3, 0x8==drive4, default==0)");
static const struct scsi_host_template pata_falcon_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
unsigned char *buf,
unsigned int buflen, int rw)
{
struct ata_device *dev = qc->dev;
struct ata_port *ap = dev->link->ap;
void __iomem *data_addr = ap->ioaddr.data_addr;
unsigned int words = buflen >> 1;
struct scsi_cmnd *cmd = qc->scsicmd;
bool swap = 1;
if (dev->class == ATA_DEV_ATA && cmd &&
!blk_rq_is_passthrough(scsi_cmd_to_rq(cmd)))
swap = (uintptr_t)ap->private_data & BIT(dev->devno);
/* Transfer multiple of 2 bytes */
if (rw == READ) {
if (swap)
raw_insw_swapw(data_addr, (u16 *)buf, words);
else
raw_insw(data_addr, (u16 *)buf, words);
} else {
if (swap)
raw_outsw_swapw(data_addr, (u16 *)buf, words);
else
raw_outsw(data_addr, (u16 *)buf, words);
}
/* Transfer trailing byte, if any. */
if (unlikely(buflen & 0x01)) {
unsigned char pad[2] = { };
/* Point buf to the tail of buffer */
buf += buflen - 1;
if (rw == READ) {
if (swap)
raw_insw_swapw(data_addr, (u16 *)pad, 1);
else
raw_insw(data_addr, (u16 *)pad, 1);
*buf = pad[0];
} else {
pad[0] = *buf;
if (swap)
raw_outsw_swapw(data_addr, (u16 *)pad, 1);
else
raw_outsw(data_addr, (u16 *)pad, 1);
}
words++;
}
return words << 1;
}
/*
* Provide our own set_mode() as we don't want to change anything that has
* already been configured..
*/
static int pata_falcon_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 ata_port_operations pata_falcon_ops = {
.inherits = &ata_sff_port_ops,
.sff_data_xfer = pata_falcon_data_xfer,
.cable_detect = ata_cable_unknown,
.set_mode = pata_falcon_set_mode,
};
static int pata_falcon_init_one(struct platform_device *pdev)
{
struct resource *base_mem_res, *ctl_mem_res;
struct resource *base_res, *ctl_res, *irq_res;
struct ata_host *host;
struct ata_port *ap;
void __iomem *base, *ctl_base;
int mask_shift = 0; /* Q40 & Falcon default */
int irq = 0, io_offset = 1, reg_shift = 2; /* Falcon defaults */
dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n");
base_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (base_res && !devm_request_region(&pdev->dev, base_res->start,
resource_size(base_res), DRV_NAME)) {
dev_err(&pdev->dev, "resources busy\n");
return -EBUSY;
}
ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start,
resource_size(ctl_res), DRV_NAME)) {
dev_err(&pdev->dev, "resources busy\n");
return -EBUSY;
}
base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!base_mem_res)
return -ENODEV;
if (!devm_request_mem_region(&pdev->dev, base_mem_res->start,
resource_size(base_mem_res), DRV_NAME)) {
dev_err(&pdev->dev, "resources busy\n");
return -EBUSY;
}
ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!ctl_mem_res)
return -ENODEV;
/* allocate host */
host = ata_host_alloc(&pdev->dev, 1);
if (!host)
return -ENOMEM;
ap = host->ports[0];
ap->ops = &pata_falcon_ops;
ap->pio_mask = ATA_PIO4;
ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
/* N.B. this assumes data_addr will be used for word-sized I/O only */
ap->ioaddr.data_addr = (void __iomem *)base_mem_res->start;
if (base_res) { /* only Q40 has IO resources */
io_offset = 0x10000;
reg_shift = 0;
base = (void __iomem *)base_res->start;
ctl_base = (void __iomem *)ctl_res->start;
} else {
base = (void __iomem *)base_mem_res->start;
ctl_base = (void __iomem *)ctl_mem_res->start;
}
ap->ioaddr.error_addr = base + io_offset + (1 << reg_shift);
ap->ioaddr.feature_addr = base + io_offset + (1 << reg_shift);
ap->ioaddr.nsect_addr = base + io_offset + (2 << reg_shift);
ap->ioaddr.lbal_addr = base + io_offset + (3 << reg_shift);
ap->ioaddr.lbam_addr = base + io_offset + (4 << reg_shift);
ap->ioaddr.lbah_addr = base + io_offset + (5 << reg_shift);
ap->ioaddr.device_addr = base + io_offset + (6 << reg_shift);
ap->ioaddr.status_addr = base + io_offset + (7 << reg_shift);
ap->ioaddr.command_addr = base + io_offset + (7 << reg_shift);
ap->ioaddr.altstatus_addr = ctl_base + io_offset;
ap->ioaddr.ctl_addr = ctl_base + io_offset;
ata_port_desc(ap, "cmd %px ctl %px data %px",
base, ctl_base, ap->ioaddr.data_addr);
if (pdev->id > 0)
mask_shift = 2;
ap->private_data = (void *)(uintptr_t)(pata_falcon_swap_mask >> mask_shift);
irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (irq_res && irq_res->start > 0) {
irq = irq_res->start;
} else {
ap->flags |= ATA_FLAG_PIO_POLLING;
ata_port_desc(ap, "no IRQ, using PIO polling");
}
/* activate */
return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
IRQF_SHARED, &pata_falcon_sht);
}
static void pata_falcon_remove_one(struct platform_device *pdev)
{
struct ata_host *host = platform_get_drvdata(pdev);
ata_host_detach(host);
}
static struct platform_driver pata_falcon_driver = {
.probe = pata_falcon_init_one,
.remove_new = pata_falcon_remove_one,
.driver = {
.name = "atari-falcon-ide",
},
};
module_platform_driver(pata_falcon_driver);
MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:atari-falcon-ide");
MODULE_VERSION(DRV_VERSION);
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