drivers/ata/pata_falcon.c - linux - Git at Google

 // 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 __init 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 int __exit pata_falcon_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_falcon_driver = {
 	.remove = __exit_p(pata_falcon_remove_one),
 	.driver   = {
 		.name	= "atari-falcon-ide",
 	},
 };

 module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one);

 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);
	// 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 __init 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 int __exit pata_falcon_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_falcon_driver = {
	.remove = __exit_p(pata_falcon_remove_one),
	.driver = {
	.name = "atari-falcon-ide",
	},
	};

	module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one);

	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);