drivers/ata/pata_falcon.c

   1 /*
   2  * Atari Falcon PATA controller driver
   3  *
   4  * Copyright (c) 2016 Samsung Electronics Co., Ltd.
   5  *              http://www.samsung.com
   6  *
   7  * Based on falconide.c:
   8  *
   9  *     Created 12 Jul 1997 by Geert Uytterhoeven
  10  *
  11  * This file is subject to the terms and conditions of the GNU General Public
  12  * License.  See the file "COPYING" in the main directory of this archive
  13  * for more details.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/blkdev.h>
  20 #include <linux/delay.h>
  21 #include <scsi/scsi_host.h>
  22 #include <scsi/scsi_cmnd.h>
  23 #include <linux/ata.h>
  24 #include <linux/libata.h>
  25 #include <linux/mm.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/platform_device.h>
  28
  29 #include <asm/setup.h>
  30 #include <asm/atarihw.h>
  31 #include <asm/atariints.h>
  32 #include <asm/atari_stdma.h>
  33 #include <asm/ide.h>
  34
  35 #define DRV_NAME "pata_falcon"
  36 #define DRV_VERSION "0.1.0"
  37
  38 #define ATA_HD_BASE     0xfff00000
  39 #define ATA_HD_CONTROL  0x39
  40
  41 static struct scsi_host_template pata_falcon_sht = {
  42         ATA_PIO_SHT(DRV_NAME),
  43 };
  44
  45 static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
  46                                           unsigned char *buf,
  47                                           unsigned int buflen, int rw)
  48 {
  49         struct ata_device *dev = qc->dev;
  50         struct ata_port *ap = dev->link->ap;
  51         void __iomem *data_addr = ap->ioaddr.data_addr;
  52         unsigned int words = buflen >> 1;
  53         struct scsi_cmnd *cmd = qc->scsicmd;
  54         bool swap = 1;
  55
  56         if (dev->class == ATA_DEV_ATA && cmd && cmd->request &&
  57             !blk_rq_is_passthrough(cmd->request))
  58                 swap = 0;
  59
  60         /* Transfer multiple of 2 bytes */
  61         if (rw == READ) {
  62                 if (swap)
  63                         raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words);
  64                 else
  65                         raw_insw((u16 *)data_addr, (u16 *)buf, words);
  66         } else {
  67                 if (swap)
  68                         raw_outsw_swapw((u16 *)data_addr, (u16 *)buf, words);
  69                 else
  70                         raw_outsw((u16 *)data_addr, (u16 *)buf, words);
  71         }
  72
  73         /* Transfer trailing byte, if any. */
  74         if (unlikely(buflen & 0x01)) {
  75                 unsigned char pad[2] = { };
  76
  77                 /* Point buf to the tail of buffer */
  78                 buf += buflen - 1;
  79
  80                 if (rw == READ) {
  81                         if (swap)
  82                                 raw_insw_swapw((u16 *)data_addr, (u16 *)pad, 1);
  83                         else
  84                                 raw_insw((u16 *)data_addr, (u16 *)pad, 1);
  85                         *buf = pad[0];
  86                 } else {
  87                         pad[0] = *buf;
  88                         if (swap)
  89                                 raw_outsw_swapw((u16 *)data_addr, (u16 *)pad, 1);
  90                         else
  91                                 raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
  92                 }
  93                 words++;
  94         }
  95
  96         return words << 1;
  97 }
  98
  99 /*
 100  * Provide our own set_mode() as we don't want to change anything that has
 101  * already been configured..
 102  */
 103 static int pata_falcon_set_mode(struct ata_link *link,
 104                                 struct ata_device **unused)
 105 {
 106         struct ata_device *dev;
 107
 108         ata_for_each_dev(dev, link, ENABLED) {
 109                 /* We don't really care */
 110                 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
 111                 dev->xfer_shift = ATA_SHIFT_PIO;
 112                 dev->flags |= ATA_DFLAG_PIO;
 113                 ata_dev_info(dev, "configured for PIO\n");
 114         }
 115         return 0;
 116 }
 117
 118 static struct ata_port_operations pata_falcon_ops = {
 119         .inherits       = &ata_sff_port_ops,
 120         .sff_data_xfer  = pata_falcon_data_xfer,
 121         .cable_detect   = ata_cable_unknown,
 122         .set_mode       = pata_falcon_set_mode,
 123 };
 124
 125 static int pata_falcon_init_one(void)
 126 {
 127         struct ata_host *host;
 128         struct ata_port *ap;
 129         struct platform_device *pdev;
 130         void __iomem *base;
 131
 132         if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
 133                 return -ENODEV;
 134
 135         pr_info(DRV_NAME ": Atari Falcon PATA controller\n");
 136
 137         pdev = platform_device_register_simple(DRV_NAME, 0, NULL, 0);
 138         if (IS_ERR(pdev))
 139                 return PTR_ERR(pdev);
 140
 141         if (!devm_request_mem_region(&pdev->dev, ATA_HD_BASE, 0x40, DRV_NAME)) {
 142                 pr_err(DRV_NAME ": resources busy\n");
 143                 return -EBUSY;
 144         }
 145
 146         /* allocate host */
 147         host = ata_host_alloc(&pdev->dev, 1);
 148         if (!host)
 149                 return -ENOMEM;
 150         ap = host->ports[0];
 151
 152         ap->ops = &pata_falcon_ops;
 153         ap->pio_mask = ATA_PIO4;
 154         ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
 155         ap->flags |= ATA_FLAG_PIO_POLLING;
 156
 157         base = (void __iomem *)ATA_HD_BASE;
 158         ap->ioaddr.data_addr            = base;
 159         ap->ioaddr.error_addr           = base + 1 + 1 * 4;
 160         ap->ioaddr.feature_addr         = base + 1 + 1 * 4;
 161         ap->ioaddr.nsect_addr           = base + 1 + 2 * 4;
 162         ap->ioaddr.lbal_addr            = base + 1 + 3 * 4;
 163         ap->ioaddr.lbam_addr            = base + 1 + 4 * 4;
 164         ap->ioaddr.lbah_addr            = base + 1 + 5 * 4;
 165         ap->ioaddr.device_addr          = base + 1 + 6 * 4;
 166         ap->ioaddr.status_addr          = base + 1 + 7 * 4;
 167         ap->ioaddr.command_addr         = base + 1 + 7 * 4;
 168
 169         ap->ioaddr.altstatus_addr       = base + ATA_HD_CONTROL;
 170         ap->ioaddr.ctl_addr             = base + ATA_HD_CONTROL;
 171
 172         ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base,
 173                       (unsigned long)base + ATA_HD_CONTROL);
 174
 175         /* activate */
 176         return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht);
 177 }
 178
 179 module_init(pata_falcon_init_one);
 180
 181 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
 182 MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
 183 MODULE_LICENSE("GPL");
 184 MODULE_VERSION(DRV_VERSION);