241 lines
6.5 KiB
C
241 lines
6.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Atari Falcon PATA controller driver
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*
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* Copyright (c) 2016 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Based on falconide.c:
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*
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* Created 12 Jul 1997 by Geert Uytterhoeven
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_cmnd.h>
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#include <linux/ata.h>
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#include <linux/libata.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <asm/setup.h>
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#include <asm/atarihw.h>
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#include <asm/atariints.h>
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#include <asm/atari_stdma.h>
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#define DRV_NAME "pata_falcon"
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#define DRV_VERSION "0.1.0"
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static int pata_falcon_swap_mask;
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module_param_named(data_swab, pata_falcon_swap_mask, int, 0444);
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MODULE_PARM_DESC(data_swab, "Data byte swap enable/disable bitmap (0x1==drive1, 0x2==drive2, 0x4==drive3, 0x8==drive4, default==0)");
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static const struct scsi_host_template pata_falcon_sht = {
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ATA_PIO_SHT(DRV_NAME),
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};
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static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
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unsigned char *buf,
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unsigned int buflen, int rw)
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{
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struct ata_device *dev = qc->dev;
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struct ata_port *ap = dev->link->ap;
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void __iomem *data_addr = ap->ioaddr.data_addr;
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unsigned int words = buflen >> 1;
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struct scsi_cmnd *cmd = qc->scsicmd;
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bool swap = 1;
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if (dev->class == ATA_DEV_ATA && cmd &&
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!blk_rq_is_passthrough(scsi_cmd_to_rq(cmd)))
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swap = (uintptr_t)ap->private_data & BIT(dev->devno);
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/* Transfer multiple of 2 bytes */
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if (rw == READ) {
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if (swap)
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raw_insw_swapw(data_addr, (u16 *)buf, words);
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else
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raw_insw(data_addr, (u16 *)buf, words);
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} else {
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if (swap)
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raw_outsw_swapw(data_addr, (u16 *)buf, words);
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else
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raw_outsw(data_addr, (u16 *)buf, words);
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}
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/* Transfer trailing byte, if any. */
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if (unlikely(buflen & 0x01)) {
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unsigned char pad[2] = { };
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/* Point buf to the tail of buffer */
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buf += buflen - 1;
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if (rw == READ) {
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if (swap)
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raw_insw_swapw(data_addr, (u16 *)pad, 1);
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else
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raw_insw(data_addr, (u16 *)pad, 1);
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*buf = pad[0];
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} else {
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pad[0] = *buf;
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if (swap)
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raw_outsw_swapw(data_addr, (u16 *)pad, 1);
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else
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raw_outsw(data_addr, (u16 *)pad, 1);
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}
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words++;
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}
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return words << 1;
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}
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/*
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* Provide our own set_mode() as we don't want to change anything that has
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* already been configured..
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*/
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static int pata_falcon_set_mode(struct ata_link *link,
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struct ata_device **unused)
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{
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struct ata_device *dev;
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ata_for_each_dev(dev, link, ENABLED) {
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/* We don't really care */
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dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
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dev->xfer_shift = ATA_SHIFT_PIO;
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dev->flags |= ATA_DFLAG_PIO;
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ata_dev_info(dev, "configured for PIO\n");
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}
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return 0;
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}
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static struct ata_port_operations pata_falcon_ops = {
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.inherits = &ata_sff_port_ops,
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.sff_data_xfer = pata_falcon_data_xfer,
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.cable_detect = ata_cable_unknown,
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.set_mode = pata_falcon_set_mode,
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};
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static int pata_falcon_init_one(struct platform_device *pdev)
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{
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struct resource *base_mem_res, *ctl_mem_res;
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struct resource *base_res, *ctl_res, *irq_res;
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struct ata_host *host;
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struct ata_port *ap;
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void __iomem *base, *ctl_base;
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int mask_shift = 0; /* Q40 & Falcon default */
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int irq = 0, io_offset = 1, reg_shift = 2; /* Falcon defaults */
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dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n");
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base_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (base_res && !devm_request_region(&pdev->dev, base_res->start,
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resource_size(base_res), DRV_NAME)) {
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dev_err(&pdev->dev, "resources busy\n");
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return -EBUSY;
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}
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ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
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if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start,
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resource_size(ctl_res), DRV_NAME)) {
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dev_err(&pdev->dev, "resources busy\n");
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return -EBUSY;
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}
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base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!base_mem_res)
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return -ENODEV;
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if (!devm_request_mem_region(&pdev->dev, base_mem_res->start,
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resource_size(base_mem_res), DRV_NAME)) {
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dev_err(&pdev->dev, "resources busy\n");
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return -EBUSY;
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}
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ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!ctl_mem_res)
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return -ENODEV;
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/* allocate host */
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host = ata_host_alloc(&pdev->dev, 1);
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if (!host)
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return -ENOMEM;
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ap = host->ports[0];
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ap->ops = &pata_falcon_ops;
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ap->pio_mask = ATA_PIO4;
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ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
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/* N.B. this assumes data_addr will be used for word-sized I/O only */
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ap->ioaddr.data_addr = (void __iomem *)base_mem_res->start;
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if (base_res) { /* only Q40 has IO resources */
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io_offset = 0x10000;
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reg_shift = 0;
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base = (void __iomem *)base_res->start;
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ctl_base = (void __iomem *)ctl_res->start;
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} else {
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base = (void __iomem *)base_mem_res->start;
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ctl_base = (void __iomem *)ctl_mem_res->start;
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}
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ap->ioaddr.error_addr = base + io_offset + (1 << reg_shift);
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ap->ioaddr.feature_addr = base + io_offset + (1 << reg_shift);
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ap->ioaddr.nsect_addr = base + io_offset + (2 << reg_shift);
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ap->ioaddr.lbal_addr = base + io_offset + (3 << reg_shift);
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ap->ioaddr.lbam_addr = base + io_offset + (4 << reg_shift);
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ap->ioaddr.lbah_addr = base + io_offset + (5 << reg_shift);
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ap->ioaddr.device_addr = base + io_offset + (6 << reg_shift);
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ap->ioaddr.status_addr = base + io_offset + (7 << reg_shift);
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ap->ioaddr.command_addr = base + io_offset + (7 << reg_shift);
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ap->ioaddr.altstatus_addr = ctl_base + io_offset;
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ap->ioaddr.ctl_addr = ctl_base + io_offset;
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ata_port_desc(ap, "cmd %px ctl %px data %px",
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base, ctl_base, ap->ioaddr.data_addr);
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if (pdev->id > 0)
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mask_shift = 2;
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ap->private_data = (void *)(uintptr_t)(pata_falcon_swap_mask >> mask_shift);
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irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (irq_res && irq_res->start > 0) {
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irq = irq_res->start;
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} else {
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ap->flags |= ATA_FLAG_PIO_POLLING;
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ata_port_desc(ap, "no IRQ, using PIO polling");
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}
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/* activate */
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return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
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IRQF_SHARED, &pata_falcon_sht);
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}
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static void pata_falcon_remove_one(struct platform_device *pdev)
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{
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struct ata_host *host = platform_get_drvdata(pdev);
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ata_host_detach(host);
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}
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static struct platform_driver pata_falcon_driver = {
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.probe = pata_falcon_init_one,
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.remove_new = pata_falcon_remove_one,
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.driver = {
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.name = "atari-falcon-ide",
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},
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};
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module_platform_driver(pata_falcon_driver);
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MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
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MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:atari-falcon-ide");
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MODULE_VERSION(DRV_VERSION);
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