linux/drivers/ata/pata_falcon.c
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   1// SPDX-License-Identifier: GPL-2.0
   2
   3/*
   4 * Atari Falcon PATA controller driver
   5 *
   6 * Copyright (c) 2016 Samsung Electronics Co., Ltd.
   7 *              http://www.samsung.com
   8 *
   9 * Based on falconide.c:
  10 *
  11 *     Created 12 Jul 1997 by Geert Uytterhoeven
  12 */
  13
  14#include <linux/kernel.h>
  15#include <linux/module.h>
  16#include <linux/init.h>
  17#include <linux/blkdev.h>
  18#include <linux/delay.h>
  19#include <scsi/scsi_host.h>
  20#include <scsi/scsi_cmnd.h>
  21#include <linux/ata.h>
  22#include <linux/libata.h>
  23#include <linux/mm.h>
  24#include <linux/interrupt.h>
  25#include <linux/platform_device.h>
  26
  27#include <asm/setup.h>
  28#include <asm/atarihw.h>
  29#include <asm/atariints.h>
  30#include <asm/atari_stdma.h>
  31#include <asm/ide.h>
  32
  33#define DRV_NAME "pata_falcon"
  34#define DRV_VERSION "0.1.0"
  35
  36#define ATA_HD_CONTROL  0x39
  37
  38static struct scsi_host_template pata_falcon_sht = {
  39        ATA_PIO_SHT(DRV_NAME),
  40};
  41
  42static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
  43                                          unsigned char *buf,
  44                                          unsigned int buflen, int rw)
  45{
  46        struct ata_device *dev = qc->dev;
  47        struct ata_port *ap = dev->link->ap;
  48        void __iomem *data_addr = ap->ioaddr.data_addr;
  49        unsigned int words = buflen >> 1;
  50        struct scsi_cmnd *cmd = qc->scsicmd;
  51        bool swap = 1;
  52
  53        if (dev->class == ATA_DEV_ATA && cmd && cmd->request &&
  54            !blk_rq_is_passthrough(cmd->request))
  55                swap = 0;
  56
  57        /* Transfer multiple of 2 bytes */
  58        if (rw == READ) {
  59                if (swap)
  60                        raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words);
  61                else
  62                        raw_insw((u16 *)data_addr, (u16 *)buf, words);
  63        } else {
  64                if (swap)
  65                        raw_outsw_swapw((u16 *)data_addr, (u16 *)buf, words);
  66                else
  67                        raw_outsw((u16 *)data_addr, (u16 *)buf, words);
  68        }
  69
  70        /* Transfer trailing byte, if any. */
  71        if (unlikely(buflen & 0x01)) {
  72                unsigned char pad[2] = { };
  73
  74                /* Point buf to the tail of buffer */
  75                buf += buflen - 1;
  76
  77                if (rw == READ) {
  78                        if (swap)
  79                                raw_insw_swapw((u16 *)data_addr, (u16 *)pad, 1);
  80                        else
  81                                raw_insw((u16 *)data_addr, (u16 *)pad, 1);
  82                        *buf = pad[0];
  83                } else {
  84                        pad[0] = *buf;
  85                        if (swap)
  86                                raw_outsw_swapw((u16 *)data_addr, (u16 *)pad, 1);
  87                        else
  88                                raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
  89                }
  90                words++;
  91        }
  92
  93        return words << 1;
  94}
  95
  96/*
  97 * Provide our own set_mode() as we don't want to change anything that has
  98 * already been configured..
  99 */
 100static int pata_falcon_set_mode(struct ata_link *link,
 101                                struct ata_device **unused)
 102{
 103        struct ata_device *dev;
 104
 105        ata_for_each_dev(dev, link, ENABLED) {
 106                /* We don't really care */
 107                dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
 108                dev->xfer_shift = ATA_SHIFT_PIO;
 109                dev->flags |= ATA_DFLAG_PIO;
 110                ata_dev_info(dev, "configured for PIO\n");
 111        }
 112        return 0;
 113}
 114
 115static struct ata_port_operations pata_falcon_ops = {
 116        .inherits       = &ata_sff_port_ops,
 117        .sff_data_xfer  = pata_falcon_data_xfer,
 118        .cable_detect   = ata_cable_unknown,
 119        .set_mode       = pata_falcon_set_mode,
 120};
 121
 122static int __init pata_falcon_init_one(struct platform_device *pdev)
 123{
 124        struct resource *res;
 125        struct ata_host *host;
 126        struct ata_port *ap;
 127        void __iomem *base;
 128
 129        dev_info(&pdev->dev, "Atari Falcon PATA controller\n");
 130
 131        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 132        if (!res)
 133                return -ENODEV;
 134
 135        if (!devm_request_mem_region(&pdev->dev, res->start,
 136                                     resource_size(res), DRV_NAME)) {
 137                dev_err(&pdev->dev, "resources busy\n");
 138                return -EBUSY;
 139        }
 140
 141        /* allocate host */
 142        host = ata_host_alloc(&pdev->dev, 1);
 143        if (!host)
 144                return -ENOMEM;
 145        ap = host->ports[0];
 146
 147        ap->ops = &pata_falcon_ops;
 148        ap->pio_mask = ATA_PIO4;
 149        ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
 150        ap->flags |= ATA_FLAG_PIO_POLLING;
 151
 152        base = (void __iomem *)res->start;
 153        ap->ioaddr.data_addr            = base;
 154        ap->ioaddr.error_addr           = base + 1 + 1 * 4;
 155        ap->ioaddr.feature_addr         = base + 1 + 1 * 4;
 156        ap->ioaddr.nsect_addr           = base + 1 + 2 * 4;
 157        ap->ioaddr.lbal_addr            = base + 1 + 3 * 4;
 158        ap->ioaddr.lbam_addr            = base + 1 + 4 * 4;
 159        ap->ioaddr.lbah_addr            = base + 1 + 5 * 4;
 160        ap->ioaddr.device_addr          = base + 1 + 6 * 4;
 161        ap->ioaddr.status_addr          = base + 1 + 7 * 4;
 162        ap->ioaddr.command_addr         = base + 1 + 7 * 4;
 163
 164        ap->ioaddr.altstatus_addr       = base + ATA_HD_CONTROL;
 165        ap->ioaddr.ctl_addr             = base + ATA_HD_CONTROL;
 166
 167        ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base,
 168                      (unsigned long)base + ATA_HD_CONTROL);
 169
 170        /* activate */
 171        return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht);
 172}
 173
 174static int __exit pata_falcon_remove_one(struct platform_device *pdev)
 175{
 176        struct ata_host *host = platform_get_drvdata(pdev);
 177
 178        ata_host_detach(host);
 179
 180        return 0;
 181}
 182
 183static struct platform_driver pata_falcon_driver = {
 184        .remove = __exit_p(pata_falcon_remove_one),
 185        .driver   = {
 186                .name   = "atari-falcon-ide",
 187        },
 188};
 189
 190module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one);
 191
 192MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
 193MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
 194MODULE_LICENSE("GPL v2");
 195MODULE_ALIAS("platform:atari-falcon-ide");
 196MODULE_VERSION(DRV_VERSION);
 197