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// SPDX-License-Identifier: GPL-2.0
/*
* Amiga Gayle PATA controller driver
*
* Copyright (c) 2018 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Based on gayle.c:
*
* Created 12 Jul 1997 by Geert Uytterhoeven
*/
#include <linux/ata.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/libata.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/zorro.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
#include <asm/amigayle.h>
#include <asm/setup.h>
#define DRV_NAME "pata_gayle"
#define DRV_VERSION "0.1.0"
#define GAYLE_CONTROL 0x101a
static const struct scsi_host_template pata_gayle_sht = {
ATA_PIO_SHT(DRV_NAME),
};
/* FIXME: is this needed? */
static unsigned int pata_gayle_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;
/* Transfer multiple of 2 bytes */
if (rw == READ)
raw_insw((u16 *)data_addr, (u16 *)buf, words);
else
raw_outsw((u16 *)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) {
raw_insw((u16 *)data_addr, (u16 *)pad, 1);
*buf = pad[0];
} else {
pad[0] = *buf;
raw_outsw((u16 *)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_gayle_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 bool pata_gayle_irq_check(struct ata_port *ap)
{
u8 ch;
ch = z_readb((unsigned long)ap->private_data);
return !!(ch & GAYLE_IRQ_IDE);
}
static void pata_gayle_irq_clear(struct ata_port *ap)
{
(void)z_readb((unsigned long)ap->ioaddr.status_addr);
z_writeb(0x7c, (unsigned long)ap->private_data);
}
static struct ata_port_operations pata_gayle_a1200_ops = {
.inherits = &ata_sff_port_ops,
.sff_data_xfer = pata_gayle_data_xfer,
.sff_irq_check = pata_gayle_irq_check,
.sff_irq_clear = pata_gayle_irq_clear,
.cable_detect = ata_cable_unknown,
.set_mode = pata_gayle_set_mode,
};
static struct ata_port_operations pata_gayle_a4000_ops = {
.inherits = &ata_sff_port_ops,
.sff_data_xfer = pata_gayle_data_xfer,
.cable_detect = ata_cable_unknown,
.set_mode = pata_gayle_set_mode,
};
static int __init pata_gayle_init_one(struct platform_device *pdev)
{
struct resource *res;
struct gayle_ide_platform_data *pdata;
struct ata_host *host;
struct ata_port *ap;
void __iomem *base;
int ret;
pdata = dev_get_platdata(&pdev->dev);
dev_info(&pdev->dev, "Amiga Gayle IDE controller (A%u style)\n",
pdata->explicit_ack ? 1200 : 4000);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
if (!devm_request_mem_region(&pdev->dev, res->start,
resource_size(res), DRV_NAME)) {
pr_err(DRV_NAME ": resources busy\n");
return -EBUSY;
}
/* allocate host */
host = ata_host_alloc(&pdev->dev, 1);
if (!host)
return -ENOMEM;
ap = host->ports[0];
if (pdata->explicit_ack)
ap->ops = &pata_gayle_a1200_ops;
else
ap->ops = &pata_gayle_a4000_ops;
ap->pio_mask = ATA_PIO4;
ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
base = ZTWO_VADDR(pdata->base);
ap->ioaddr.data_addr = base;
ap->ioaddr.error_addr = base + 2 + 1 * 4;
ap->ioaddr.feature_addr = base + 2 + 1 * 4;
ap->ioaddr.nsect_addr = base + 2 + 2 * 4;
ap->ioaddr.lbal_addr = base + 2 + 3 * 4;
ap->ioaddr.lbam_addr = base + 2 + 4 * 4;
ap->ioaddr.lbah_addr = base + 2 + 5 * 4;
ap->ioaddr.device_addr = base + 2 + 6 * 4;
ap->ioaddr.status_addr = base + 2 + 7 * 4;
ap->ioaddr.command_addr = base + 2 + 7 * 4;
ap->ioaddr.altstatus_addr = base + GAYLE_CONTROL;
ap->ioaddr.ctl_addr = base + GAYLE_CONTROL;
ap->private_data = (void *)ZTWO_VADDR(pdata->irqport);
ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", pdata->base,
pdata->base + GAYLE_CONTROL);
ret = ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt,
IRQF_SHARED, &pata_gayle_sht);
if (ret)
return ret;
platform_set_drvdata(pdev, host);
return 0;
}
static int __exit pata_gayle_remove_one(struct platform_device *pdev)
{
struct ata_host *host = platform_get_drvdata(pdev);
ata_host_detach(host);
return 0;
}
static struct platform_driver pata_gayle_driver = {
.remove = __exit_p(pata_gayle_remove_one),
.driver = {
.name = "amiga-gayle-ide",
},
};
module_platform_driver_probe(pata_gayle_driver, pata_gayle_init_one);
MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
MODULE_DESCRIPTION("low-level driver for Amiga Gayle PATA");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:amiga-gayle-ide");
MODULE_VERSION(DRV_VERSION);
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