drivers/ata/pata_gayle.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 /*
   4  * Amiga Gayle PATA controller driver
   5  *
   6  * Copyright (c) 2018 Samsung Electronics Co., Ltd.
   7  *              http://www.samsung.com
   8  *
   9  * Based on gayle.c:
  10  *
  11  *     Created 12 Jul 1997 by Geert Uytterhoeven
  12  */
  13
  14 #include <linux/ata.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/delay.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/kernel.h>
  19 #include <linux/libata.h>
  20 #include <linux/mm.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/zorro.h>
  24 #include <scsi/scsi_cmnd.h>
  25 #include <scsi/scsi_host.h>
  26
  27 #include <asm/amigahw.h>
  28 #include <asm/amigaints.h>
  29 #include <asm/amigayle.h>
  30 #include <asm/setup.h>
  31
  32 #define DRV_NAME "pata_gayle"
  33 #define DRV_VERSION "0.1.0"
  34
  35 #define GAYLE_CONTROL   0x101a
  36
  37 static const struct scsi_host_template pata_gayle_sht = {
  38         ATA_PIO_SHT(DRV_NAME),
  39 };
  40
  41 /* FIXME: is this needed? */
  42 static unsigned int pata_gayle_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
  51         /* Transfer multiple of 2 bytes */
  52         if (rw == READ)
  53                 raw_insw((u16 *)data_addr, (u16 *)buf, words);
  54         else
  55                 raw_outsw((u16 *)data_addr, (u16 *)buf, words);
  56
  57         /* Transfer trailing byte, if any. */
  58         if (unlikely(buflen & 0x01)) {
  59                 unsigned char pad[2] = { };
  60
  61                 /* Point buf to the tail of buffer */
  62                 buf += buflen - 1;
  63
  64                 if (rw == READ) {
  65                         raw_insw((u16 *)data_addr, (u16 *)pad, 1);
  66                         *buf = pad[0];
  67                 } else {
  68                         pad[0] = *buf;
  69                         raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
  70                 }
  71                 words++;
  72         }
  73
  74         return words << 1;
  75 }
  76
  77 /*
  78  * Provide our own set_mode() as we don't want to change anything that has
  79  * already been configured..
  80  */
  81 static int pata_gayle_set_mode(struct ata_link *link,
  82                                struct ata_device **unused)
  83 {
  84         struct ata_device *dev;
  85
  86         ata_for_each_dev(dev, link, ENABLED) {
  87                 /* We don't really care */
  88                 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
  89                 dev->xfer_shift = ATA_SHIFT_PIO;
  90                 dev->flags |= ATA_DFLAG_PIO;
  91                 ata_dev_info(dev, "configured for PIO\n");
  92         }
  93         return 0;
  94 }
  95
  96 static bool pata_gayle_irq_check(struct ata_port *ap)
  97 {
  98         u8 ch;
  99
 100         ch = z_readb((unsigned long)ap->private_data);
 101
 102         return !!(ch & GAYLE_IRQ_IDE);
 103 }
 104
 105 static void pata_gayle_irq_clear(struct ata_port *ap)
 106 {
 107         (void)z_readb((unsigned long)ap->ioaddr.status_addr);
 108         z_writeb(0x7c, (unsigned long)ap->private_data);
 109 }
 110
 111 static struct ata_port_operations pata_gayle_a1200_ops = {
 112         .inherits       = &ata_sff_port_ops,
 113         .sff_data_xfer  = pata_gayle_data_xfer,
 114         .sff_irq_check  = pata_gayle_irq_check,
 115         .sff_irq_clear  = pata_gayle_irq_clear,
 116         .cable_detect   = ata_cable_unknown,
 117         .set_mode       = pata_gayle_set_mode,
 118 };
 119
 120 static struct ata_port_operations pata_gayle_a4000_ops = {
 121         .inherits       = &ata_sff_port_ops,
 122         .sff_data_xfer  = pata_gayle_data_xfer,
 123         .cable_detect   = ata_cable_unknown,
 124         .set_mode       = pata_gayle_set_mode,
 125 };
 126
 127 static int pata_gayle_init_one(struct platform_device *pdev)
 128 {
 129         struct resource *res;
 130         struct gayle_ide_platform_data *pdata;
 131         struct ata_host *host;
 132         struct ata_port *ap;
 133         void __iomem *base;
 134         int ret;
 135
 136         pdata = dev_get_platdata(&pdev->dev);
 137
 138         dev_info(&pdev->dev, "Amiga Gayle IDE controller (A%u style)\n",
 139                 pdata->explicit_ack ? 1200 : 4000);
 140
 141         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 142         if (!res)
 143                 return -ENODEV;
 144
 145         if (!devm_request_mem_region(&pdev->dev, res->start,
 146                                      resource_size(res), DRV_NAME)) {
 147                 pr_err(DRV_NAME ": resources busy\n");
 148                 return -EBUSY;
 149         }
 150
 151         /* allocate host */
 152         host = ata_host_alloc(&pdev->dev, 1);
 153         if (!host)
 154                 return -ENOMEM;
 155
 156         ap = host->ports[0];
 157
 158         if (pdata->explicit_ack)
 159                 ap->ops = &pata_gayle_a1200_ops;
 160         else
 161                 ap->ops = &pata_gayle_a4000_ops;
 162
 163         ap->pio_mask = ATA_PIO4;
 164         ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
 165
 166         base = ZTWO_VADDR(pdata->base);
 167         ap->ioaddr.data_addr            = base;
 168         ap->ioaddr.error_addr           = base + 2 + 1 * 4;
 169         ap->ioaddr.feature_addr         = base + 2 + 1 * 4;
 170         ap->ioaddr.nsect_addr           = base + 2 + 2 * 4;
 171         ap->ioaddr.lbal_addr            = base + 2 + 3 * 4;
 172         ap->ioaddr.lbam_addr            = base + 2 + 4 * 4;
 173         ap->ioaddr.lbah_addr            = base + 2 + 5 * 4;
 174         ap->ioaddr.device_addr          = base + 2 + 6 * 4;
 175         ap->ioaddr.status_addr          = base + 2 + 7 * 4;
 176         ap->ioaddr.command_addr         = base + 2 + 7 * 4;
 177
 178         ap->ioaddr.altstatus_addr       = base + GAYLE_CONTROL;
 179         ap->ioaddr.ctl_addr             = base + GAYLE_CONTROL;
 180
 181         ap->private_data = (void *)ZTWO_VADDR(pdata->irqport);
 182
 183         ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", pdata->base,
 184                       pdata->base + GAYLE_CONTROL);
 185
 186         ret = ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt,
 187                                 IRQF_SHARED, &pata_gayle_sht);
 188         if (ret)
 189                 return ret;
 190
 191         platform_set_drvdata(pdev, host);
 192
 193         return 0;
 194 }
 195
 196 static void pata_gayle_remove_one(struct platform_device *pdev)
 197 {
 198         struct ata_host *host = platform_get_drvdata(pdev);
 199
 200         ata_host_detach(host);
 201 }
 202
 203 static struct platform_driver pata_gayle_driver = {
 204         .probe = pata_gayle_init_one,
 205         .remove_new = pata_gayle_remove_one,
 206         .driver   = {
 207                 .name   = "amiga-gayle-ide",
 208         },
 209 };
 210
 211 module_platform_driver(pata_gayle_driver);
 212
 213 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
 214 MODULE_DESCRIPTION("low-level driver for Amiga Gayle PATA");
 215 MODULE_LICENSE("GPL v2");
 216 MODULE_ALIAS("platform:amiga-gayle-ide");
 217 MODULE_VERSION(DRV_VERSION);