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