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
  32 #define DRV_NAME "pata_falcon"
  33 #define DRV_VERSION "0.1.0"
  34
  35 static int pata_falcon_swap_mask;
  36
  37 module_param_named(data_swab, pata_falcon_swap_mask, int, 0444);
  38 MODULE_PARM_DESC(data_swab, "Data byte swap enable/disable bitmap (0x1==drive1, 0x2==drive2, 0x4==drive3, 0x8==drive4, default==0)");
  39
  40 static const struct scsi_host_template pata_falcon_sht = {
  41         ATA_PIO_SHT(DRV_NAME),
  42 };
  43
  44 static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
  45                                           unsigned char *buf,
  46                                           unsigned int buflen, int rw)
  47 {
  48         struct ata_device *dev = qc->dev;
  49         struct ata_port *ap = dev->link->ap;
  50         void __iomem *data_addr = ap->ioaddr.data_addr;
  51         unsigned int words = buflen >> 1;
  52         struct scsi_cmnd *cmd = qc->scsicmd;
  53         bool swap = 1;
  54
  55         if (dev->class == ATA_DEV_ATA && cmd &&
  56             !blk_rq_is_passthrough(scsi_cmd_to_rq(cmd)))
  57                 swap = (uintptr_t)ap->private_data & BIT(dev->devno);
  58
  59         /* Transfer multiple of 2 bytes */
  60         if (rw == READ) {
  61                 if (swap)
  62                         raw_insw_swapw(data_addr, (u16 *)buf, words);
  63                 else
  64                         raw_insw(data_addr, (u16 *)buf, words);
  65         } else {
  66                 if (swap)
  67                         raw_outsw_swapw(data_addr, (u16 *)buf, words);
  68                 else
  69                         raw_outsw(data_addr, (u16 *)buf, words);
  70         }
  71
  72         /* Transfer trailing byte, if any. */
  73         if (unlikely(buflen & 0x01)) {
  74                 unsigned char pad[2] = { };
  75
  76                 /* Point buf to the tail of buffer */
  77                 buf += buflen - 1;
  78
  79                 if (rw == READ) {
  80                         if (swap)
  81                                 raw_insw_swapw(data_addr, (u16 *)pad, 1);
  82                         else
  83                                 raw_insw(data_addr, (u16 *)pad, 1);
  84                         *buf = pad[0];
  85                 } else {
  86                         pad[0] = *buf;
  87                         if (swap)
  88                                 raw_outsw_swapw(data_addr, (u16 *)pad, 1);
  89                         else
  90                                 raw_outsw(data_addr, (u16 *)pad, 1);
  91                 }
  92                 words++;
  93         }
  94
  95         return words << 1;
  96 }
  97
  98 /*
  99  * Provide our own set_mode() as we don't want to change anything that has
 100  * already been configured..
 101  */
 102 static int pata_falcon_set_mode(struct ata_link *link,
 103                                 struct ata_device **unused)
 104 {
 105         struct ata_device *dev;
 106
 107         ata_for_each_dev(dev, link, ENABLED) {
 108                 /* We don't really care */
 109                 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
 110                 dev->xfer_shift = ATA_SHIFT_PIO;
 111                 dev->flags |= ATA_DFLAG_PIO;
 112                 ata_dev_info(dev, "configured for PIO\n");
 113         }
 114         return 0;
 115 }
 116
 117 static struct ata_port_operations pata_falcon_ops = {
 118         .inherits       = &ata_sff_port_ops,
 119         .sff_data_xfer  = pata_falcon_data_xfer,
 120         .cable_detect   = ata_cable_unknown,
 121         .set_mode       = pata_falcon_set_mode,
 122 };
 123
 124 static int pata_falcon_init_one(struct platform_device *pdev)
 125 {
 126         struct resource *base_mem_res, *ctl_mem_res;
 127         struct resource *base_res, *ctl_res, *irq_res;
 128         struct ata_host *host;
 129         struct ata_port *ap;
 130         void __iomem *base, *ctl_base;
 131         int mask_shift = 0; /* Q40 & Falcon default */
 132         int irq = 0, io_offset = 1, reg_shift = 2; /* Falcon defaults */
 133
 134         dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n");
 135
 136         base_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 137         if (base_res && !devm_request_region(&pdev->dev, base_res->start,
 138                                            resource_size(base_res), DRV_NAME)) {
 139                 dev_err(&pdev->dev, "resources busy\n");
 140                 return -EBUSY;
 141         }
 142
 143         ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
 144         if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start,
 145                                             resource_size(ctl_res), DRV_NAME)) {
 146                 dev_err(&pdev->dev, "resources busy\n");
 147                 return -EBUSY;
 148         }
 149
 150         base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 151         if (!base_mem_res)
 152                 return -ENODEV;
 153         if (!devm_request_mem_region(&pdev->dev, base_mem_res->start,
 154                                      resource_size(base_mem_res), DRV_NAME)) {
 155                 dev_err(&pdev->dev, "resources busy\n");
 156                 return -EBUSY;
 157         }
 158
 159         ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 160         if (!ctl_mem_res)
 161                 return -ENODEV;
 162
 163         /* allocate host */
 164         host = ata_host_alloc(&pdev->dev, 1);
 165         if (!host)
 166                 return -ENOMEM;
 167         ap = host->ports[0];
 168
 169         ap->ops = &pata_falcon_ops;
 170         ap->pio_mask = ATA_PIO4;
 171         ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
 172
 173         /* N.B. this assumes data_addr will be used for word-sized I/O only */
 174         ap->ioaddr.data_addr = (void __iomem *)base_mem_res->start;
 175
 176         if (base_res) {         /* only Q40 has IO resources */
 177                 io_offset = 0x10000;
 178                 reg_shift = 0;
 179                 base = (void __iomem *)base_res->start;
 180                 ctl_base = (void __iomem *)ctl_res->start;
 181         } else {
 182                 base = (void __iomem *)base_mem_res->start;
 183                 ctl_base = (void __iomem *)ctl_mem_res->start;
 184         }
 185
 186         ap->ioaddr.error_addr   = base + io_offset + (1 << reg_shift);
 187         ap->ioaddr.feature_addr = base + io_offset + (1 << reg_shift);
 188         ap->ioaddr.nsect_addr   = base + io_offset + (2 << reg_shift);
 189         ap->ioaddr.lbal_addr    = base + io_offset + (3 << reg_shift);
 190         ap->ioaddr.lbam_addr    = base + io_offset + (4 << reg_shift);
 191         ap->ioaddr.lbah_addr    = base + io_offset + (5 << reg_shift);
 192         ap->ioaddr.device_addr  = base + io_offset + (6 << reg_shift);
 193         ap->ioaddr.status_addr  = base + io_offset + (7 << reg_shift);
 194         ap->ioaddr.command_addr = base + io_offset + (7 << reg_shift);
 195
 196         ap->ioaddr.altstatus_addr       = ctl_base + io_offset;
 197         ap->ioaddr.ctl_addr             = ctl_base + io_offset;
 198
 199         ata_port_desc(ap, "cmd %px ctl %px data %px",
 200                       base, ctl_base, ap->ioaddr.data_addr);
 201
 202         if (pdev->id > 0)
 203                 mask_shift = 2;
 204         ap->private_data = (void *)(uintptr_t)(pata_falcon_swap_mask >> mask_shift);
 205
 206         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 207         if (irq_res && irq_res->start > 0) {
 208                 irq = irq_res->start;
 209         } else {
 210                 ap->flags |= ATA_FLAG_PIO_POLLING;
 211                 ata_port_desc(ap, "no IRQ, using PIO polling");
 212         }
 213
 214         /* activate */
 215         return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
 216                                  IRQF_SHARED, &pata_falcon_sht);
 217 }
 218
 219 static void pata_falcon_remove_one(struct platform_device *pdev)
 220 {
 221         struct ata_host *host = platform_get_drvdata(pdev);
 222
 223         ata_host_detach(host);
 224 }
 225
 226 static struct platform_driver pata_falcon_driver = {
 227         .probe = pata_falcon_init_one,
 228         .remove = pata_falcon_remove_one,
 229         .driver = {
 230                 .name   = "atari-falcon-ide",
 231         },
 232 };
 233
 234 module_platform_driver(pata_falcon_driver);
 235
 236 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
 237 MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
 238 MODULE_LICENSE("GPL v2");
 239 MODULE_ALIAS("platform:atari-falcon-ide");
 240 MODULE_VERSION(DRV_VERSION);