drivers/ata/pata_falcon.c

   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
  38 static struct scsi_host_template pata_falcon_sht = {
  39         ATA_PIO_SHT(DRV_NAME),
  40 };
  41
  42 static 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  */
 100 static 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
 115 static 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
 122 static 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
 174 static 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
 183 static struct platform_driver pata_falcon_driver = {
 184         .remove = __exit_p(pata_falcon_remove_one),
 185         .driver   = {
 186                 .name   = "atari-falcon-ide",
 187         },
 188 };
 189
 190 module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one);
 191
 192 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
 193 MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
 194 MODULE_LICENSE("GPL v2");
 195 MODULE_ALIAS("platform:atari-falcon-ide");
 196 MODULE_VERSION(DRV_VERSION);