Commit 9ab27d1d authored by Bartlomiej Zolnierkiewicz's avatar Bartlomiej Zolnierkiewicz Committed by Tejun Heo
Browse files

ata: add Amiga Gayle PATA controller driver 



Add Amiga Gayle PATA controller driver. It enables libata support
for the on-board IDE interfaces on some Amiga models (A600, A1200,
A4000 and A4000T) and also for IDE interfaces on the Zorro expansion
bus (M-Tech E-Matrix 530 expansion card).

Thanks to John Paul Adrian Glaubitz and Michael Schmitz for help
with testing the driver.

Tested-by: default avatarJohn Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Michael Schmitz <schmitzmic@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent e5878732

drivers/ata/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -963,6 +963,18 @@ config PATA_FALCON 


	  If unsure, say N.



config PATA_GAYLE

	tristate "Amiga Gayle PATA support"

	depends on M68K && AMIGA

	help

	  This option enables support for the on-board IDE

	  interfaces on some Amiga models (A600, A1200,

	  A4000 and A4000T) and also for IDE interfaces on

	  the Zorro expansion bus (M-Tech E-Matrix 530

	  expansion card).



	  If unsure, say N.



config PATA_ISAPNP

	tristate "ISA Plug and Play PATA support"

	depends on ISAPNP

drivers/ata/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -98,6 +98,7 @@ obj-$(CONFIG_PATA_WINBOND) += pata_sl82c105.o 
# SFF PIO only

obj-$(CONFIG_PATA_CMD640_PCI)	+= pata_cmd640.o

obj-$(CONFIG_PATA_FALCON)	+= pata_falcon.o

obj-$(CONFIG_PATA_GAYLE)	+= pata_gayle.o

obj-$(CONFIG_PATA_ISAPNP)	+= pata_isapnp.o

obj-$(CONFIG_PATA_IXP4XX_CF)	+= pata_ixp4xx_cf.o

obj-$(CONFIG_PATA_MPIIX)	+= pata_mpiix.o

drivers/ata/pata_gayle.c

0 → 100644
+219 −0
Original line number Diff line number Diff line 
// 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/ide.h>

#include <asm/setup.h>



#define DRV_NAME "pata_gayle"

#define DRV_VERSION "0.1.0"



#define GAYLE_CONTROL	0x101a



static 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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