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_BASE     0xfff00000
  37 #define ATA_HD_CONTROL  0x39
  38
  39 static struct scsi_host_template pata_falcon_sht = {
  40         ATA_PIO_SHT(DRV_NAME),
  41 };
  42
  43 static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
  44                                           unsigned char *buf,
  45                                           unsigned int buflen, int rw)
  46 {
  47         struct ata_device *dev = qc->dev;
  48         struct ata_port *ap = dev->link->ap;
  49         void __iomem *data_addr = ap->ioaddr.data_addr;
  50         unsigned int words = buflen >> 1;
  51         struct scsi_cmnd *cmd = qc->scsicmd;
  52         bool swap = 1;
  53
  54         if (dev->class == ATA_DEV_ATA && cmd && cmd->request &&
  55             !blk_rq_is_passthrough(cmd->request))
  56                 swap = 0;
  57
  58         /* Transfer multiple of 2 bytes */
  59         if (rw == READ) {
  60                 if (swap)
  61                         raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words);
  62                 else
  63                         raw_insw((u16 *)data_addr, (u16 *)buf, words);
  64         } else {
  65                 if (swap)
  66                         raw_outsw_swapw((u16 *)data_addr, (u16 *)buf, words);
  67                 else
  68                         raw_outsw((u16 *)data_addr, (u16 *)buf, words);
  69         }
  70
  71         /* Transfer trailing byte, if any. */
  72         if (unlikely(buflen & 0x01)) {
  73                 unsigned char pad[2] = { };
  74
  75                 /* Point buf to the tail of buffer */
  76                 buf += buflen - 1;
  77
  78                 if (rw == READ) {
  79                         if (swap)
  80                                 raw_insw_swapw((u16 *)data_addr, (u16 *)pad, 1);
  81                         else
  82                                 raw_insw((u16 *)data_addr, (u16 *)pad, 1);
  83                         *buf = pad[0];
  84                 } else {
  85                         pad[0] = *buf;
  86                         if (swap)
  87                                 raw_outsw_swapw((u16 *)data_addr, (u16 *)pad, 1);
  88                         else
  89                                 raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
  90                 }
  91                 words++;
  92         }
  93
  94         return words << 1;
  95 }
  96
  97 /*
  98  * Provide our own set_mode() as we don't want to change anything that has
  99  * already been configured..
 100  */
 101 static int pata_falcon_set_mode(struct ata_link *link,
 102                                 struct ata_device **unused)
 103 {
 104         struct ata_device *dev;
 105
 106         ata_for_each_dev(dev, link, ENABLED) {
 107                 /* We don't really care */
 108                 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
 109                 dev->xfer_shift = ATA_SHIFT_PIO;
 110                 dev->flags |= ATA_DFLAG_PIO;
 111                 ata_dev_info(dev, "configured for PIO\n");
 112         }
 113         return 0;
 114 }
 115
 116 static struct ata_port_operations pata_falcon_ops = {
 117         .inherits       = &ata_sff_port_ops,
 118         .sff_data_xfer  = pata_falcon_data_xfer,
 119         .cable_detect   = ata_cable_unknown,
 120         .set_mode       = pata_falcon_set_mode,
 121 };
 122
 123 static int pata_falcon_init_one(void)
 124 {
 125         struct ata_host *host;
 126         struct ata_port *ap;
 127         struct platform_device *pdev;
 128         void __iomem *base;
 129
 130         if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
 131                 return -ENODEV;
 132
 133         pr_info(DRV_NAME ": Atari Falcon PATA controller\n");
 134
 135         pdev = platform_device_register_simple(DRV_NAME, 0, NULL, 0);
 136         if (IS_ERR(pdev))
 137                 return PTR_ERR(pdev);
 138
 139         if (!devm_request_mem_region(&pdev->dev, ATA_HD_BASE, 0x40, DRV_NAME)) {
 140                 pr_err(DRV_NAME ": resources busy\n");
 141                 return -EBUSY;
 142         }
 143
 144         /* allocate host */
 145         host = ata_host_alloc(&pdev->dev, 1);
 146         if (!host)
 147                 return -ENOMEM;
 148         ap = host->ports[0];
 149
 150         ap->ops = &pata_falcon_ops;
 151         ap->pio_mask = ATA_PIO4;
 152         ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
 153         ap->flags |= ATA_FLAG_PIO_POLLING;
 154
 155         base = (void __iomem *)ATA_HD_BASE;
 156         ap->ioaddr.data_addr            = base;
 157         ap->ioaddr.error_addr           = base + 1 + 1 * 4;
 158         ap->ioaddr.feature_addr         = base + 1 + 1 * 4;
 159         ap->ioaddr.nsect_addr           = base + 1 + 2 * 4;
 160         ap->ioaddr.lbal_addr            = base + 1 + 3 * 4;
 161         ap->ioaddr.lbam_addr            = base + 1 + 4 * 4;
 162         ap->ioaddr.lbah_addr            = base + 1 + 5 * 4;
 163         ap->ioaddr.device_addr          = base + 1 + 6 * 4;
 164         ap->ioaddr.status_addr          = base + 1 + 7 * 4;
 165         ap->ioaddr.command_addr         = base + 1 + 7 * 4;
 166
 167         ap->ioaddr.altstatus_addr       = base + ATA_HD_CONTROL;
 168         ap->ioaddr.ctl_addr             = base + ATA_HD_CONTROL;
 169
 170         ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base,
 171                       (unsigned long)base + ATA_HD_CONTROL);
 172
 173         /* activate */
 174         return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht);
 175 }
 176
 177 module_init(pata_falcon_init_one);
 178
 179 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
 180 MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
 181 MODULE_LICENSE("GPL v2");
 182 MODULE_VERSION(DRV_VERSION);