drivers/ata/pata_buddha.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 /*
   4  * Buddha, Catweasel and X-Surf PATA controller driver
   5  *
   6  * Copyright (c) 2018 Samsung Electronics Co., Ltd.
   7  *              http://www.samsung.com
   8  *
   9  * Based on buddha.c:
  10  *
  11  *      Copyright (C) 1997, 2001 by Geert Uytterhoeven and others
  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/mod_devicetable.h>
  22 #include <linux/module.h>
  23 #include <linux/types.h>
  24 #include <linux/zorro.h>
  25 #include <scsi/scsi_cmnd.h>
  26 #include <scsi/scsi_host.h>
  27
  28 #include <asm/amigahw.h>
  29 #include <asm/amigaints.h>
  30 #include <asm/ide.h>
  31 #include <asm/setup.h>
  32
  33 #define DRV_NAME "pata_buddha"
  34 #define DRV_VERSION "0.1.1"
  35
  36 #define BUDDHA_BASE1    0x800
  37 #define BUDDHA_BASE2    0xa00
  38 #define BUDDHA_BASE3    0xc00
  39 #define XSURF_BASE1     0xb000 /* 2.5" interface */
  40 #define XSURF_BASE2     0xd000 /* 3.5" interface */
  41 #define BUDDHA_CONTROL  0x11a
  42 #define BUDDHA_IRQ      0xf00
  43 #define XSURF_IRQ       0x7e
  44 #define BUDDHA_IRQ_MR   0xfc0   /* master interrupt enable */
  45
  46 enum {
  47         BOARD_BUDDHA = 0,
  48         BOARD_CATWEASEL,
  49         BOARD_XSURF
  50 };
  51
  52 static unsigned int buddha_bases[3] = {
  53         BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
  54 };
  55
  56 static unsigned int xsurf_bases[2] = {
  57         XSURF_BASE1, XSURF_BASE2
  58 };
  59
  60 static struct scsi_host_template pata_buddha_sht = {
  61         ATA_PIO_SHT(DRV_NAME),
  62 };
  63
  64 /* FIXME: is this needed? */
  65 static unsigned int pata_buddha_data_xfer(struct ata_queued_cmd *qc,
  66                                          unsigned char *buf,
  67                                          unsigned int buflen, int rw)
  68 {
  69         struct ata_device *dev = qc->dev;
  70         struct ata_port *ap = dev->link->ap;
  71         void __iomem *data_addr = ap->ioaddr.data_addr;
  72         unsigned int words = buflen >> 1;
  73
  74         /* Transfer multiple of 2 bytes */
  75         if (rw == READ)
  76                 raw_insw((u16 *)data_addr, (u16 *)buf, words);
  77         else
  78                 raw_outsw((u16 *)data_addr, (u16 *)buf, words);
  79
  80         /* Transfer trailing byte, if any. */
  81         if (unlikely(buflen & 0x01)) {
  82                 unsigned char pad[2] = { };
  83
  84                 /* Point buf to the tail of buffer */
  85                 buf += buflen - 1;
  86
  87                 if (rw == READ) {
  88                         raw_insw((u16 *)data_addr, (u16 *)pad, 1);
  89                         *buf = pad[0];
  90                 } else {
  91                         pad[0] = *buf;
  92                         raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
  93                 }
  94                 words++;
  95         }
  96
  97         return words << 1;
  98 }
  99
 100 /*
 101  * Provide our own set_mode() as we don't want to change anything that has
 102  * already been configured..
 103  */
 104 static int pata_buddha_set_mode(struct ata_link *link,
 105                                 struct ata_device **unused)
 106 {
 107         struct ata_device *dev;
 108
 109         ata_for_each_dev(dev, link, ENABLED) {
 110                 /* We don't really care */
 111                 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
 112                 dev->xfer_shift = ATA_SHIFT_PIO;
 113                 dev->flags |= ATA_DFLAG_PIO;
 114                 ata_dev_info(dev, "configured for PIO\n");
 115         }
 116         return 0;
 117 }
 118
 119 static bool pata_buddha_irq_check(struct ata_port *ap)
 120 {
 121         u8 ch;
 122
 123         ch = z_readb((unsigned long)ap->private_data);
 124
 125         return !!(ch & 0x80);
 126 }
 127
 128 static void pata_xsurf_irq_clear(struct ata_port *ap)
 129 {
 130         z_writeb(0, (unsigned long)ap->private_data);
 131 }
 132
 133 static struct ata_port_operations pata_buddha_ops = {
 134         .inherits       = &ata_sff_port_ops,
 135         .sff_data_xfer  = pata_buddha_data_xfer,
 136         .sff_irq_check  = pata_buddha_irq_check,
 137         .cable_detect   = ata_cable_unknown,
 138         .set_mode       = pata_buddha_set_mode,
 139 };
 140
 141 static struct ata_port_operations pata_xsurf_ops = {
 142         .inherits       = &ata_sff_port_ops,
 143         .sff_data_xfer  = pata_buddha_data_xfer,
 144         .sff_irq_check  = pata_buddha_irq_check,
 145         .sff_irq_clear  = pata_xsurf_irq_clear,
 146         .cable_detect   = ata_cable_unknown,
 147         .set_mode       = pata_buddha_set_mode,
 148 };
 149
 150 static int pata_buddha_probe(struct zorro_dev *z,
 151                              const struct zorro_device_id *ent)
 152 {
 153         static const char * const board_name[] = {
 154                 "Buddha", "Catweasel", "X-Surf"
 155         };
 156         struct ata_host *host;
 157         void __iomem *buddha_board;
 158         unsigned long board;
 159         unsigned int type = ent->driver_data;
 160         unsigned int nr_ports = (type == BOARD_CATWEASEL) ? 3 : 2;
 161         void *old_drvdata;
 162         int i;
 163
 164         dev_info(&z->dev, "%s IDE controller\n", board_name[type]);
 165
 166         board = z->resource.start;
 167
 168         if (type != BOARD_XSURF) {
 169                 if (!devm_request_mem_region(&z->dev,
 170                                              board + BUDDHA_BASE1,
 171                                              0x800, DRV_NAME))
 172                         return -ENXIO;
 173         } else {
 174                 if (!devm_request_mem_region(&z->dev,
 175                                              board + XSURF_BASE1,
 176                                              0x1000, DRV_NAME))
 177                         return -ENXIO;
 178                 if (!devm_request_mem_region(&z->dev,
 179                                              board + XSURF_BASE2,
 180                                              0x1000, DRV_NAME)) {
 181                 }
 182         }
 183
 184         /* Workaround for X-Surf: Save drvdata in case zorro8390 has set it */
 185         if (type == BOARD_XSURF)
 186                 old_drvdata = dev_get_drvdata(&z->dev);
 187
 188         /* allocate host */
 189         host = ata_host_alloc(&z->dev, nr_ports);
 190         if (type == BOARD_XSURF)
 191                 dev_set_drvdata(&z->dev, old_drvdata);
 192         if (!host)
 193                 return -ENXIO;
 194
 195         buddha_board = ZTWO_VADDR(board);
 196
 197         /* enable the board IRQ on Buddha/Catweasel */
 198         if (type != BOARD_XSURF)
 199                 z_writeb(0, buddha_board + BUDDHA_IRQ_MR);
 200
 201         for (i = 0; i < nr_ports; i++) {
 202                 struct ata_port *ap = host->ports[i];
 203                 void __iomem *base, *irqport;
 204                 unsigned long ctl = 0;
 205
 206                 if (type != BOARD_XSURF) {
 207                         ap->ops = &pata_buddha_ops;
 208                         base = buddha_board + buddha_bases[i];
 209                         ctl = BUDDHA_CONTROL;
 210                         irqport = buddha_board + BUDDHA_IRQ + i * 0x40;
 211                 } else {
 212                         ap->ops = &pata_xsurf_ops;
 213                         base = buddha_board + xsurf_bases[i];
 214                         /* X-Surf has no CS1* (Control/AltStat) */
 215                         irqport = buddha_board + XSURF_IRQ;
 216                 }
 217
 218                 ap->pio_mask = ATA_PIO4;
 219                 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
 220
 221                 ap->ioaddr.data_addr            = base;
 222                 ap->ioaddr.error_addr           = base + 2 + 1 * 4;
 223                 ap->ioaddr.feature_addr         = base + 2 + 1 * 4;
 224                 ap->ioaddr.nsect_addr           = base + 2 + 2 * 4;
 225                 ap->ioaddr.lbal_addr            = base + 2 + 3 * 4;
 226                 ap->ioaddr.lbam_addr            = base + 2 + 4 * 4;
 227                 ap->ioaddr.lbah_addr            = base + 2 + 5 * 4;
 228                 ap->ioaddr.device_addr          = base + 2 + 6 * 4;
 229                 ap->ioaddr.status_addr          = base + 2 + 7 * 4;
 230                 ap->ioaddr.command_addr         = base + 2 + 7 * 4;
 231
 232                 if (ctl) {
 233                         ap->ioaddr.altstatus_addr = base + ctl;
 234                         ap->ioaddr.ctl_addr       = base + ctl;
 235                 }
 236
 237                 ap->private_data = (void *)irqport;
 238
 239                 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", board,
 240                               ctl ? board + buddha_bases[i] + ctl : 0);
 241         }
 242
 243         ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt,
 244                           IRQF_SHARED, &pata_buddha_sht);
 245
 246         return 0;
 247 }
 248
 249 static void pata_buddha_remove(struct zorro_dev *z)
 250 {
 251         struct ata_host *host = dev_get_drvdata(&z->dev);
 252
 253         ata_host_detach(host);
 254 }
 255
 256 static const struct zorro_device_id pata_buddha_zorro_tbl[] = {
 257         { ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA, BOARD_BUDDHA},
 258         { ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL, BOARD_CATWEASEL},
 259         { 0 }
 260 };
 261 MODULE_DEVICE_TABLE(zorro, pata_buddha_zorro_tbl);
 262
 263 static struct zorro_driver pata_buddha_driver = {
 264         .name           = "pata_buddha",
 265         .id_table       = pata_buddha_zorro_tbl,
 266         .probe          = pata_buddha_probe,
 267         .remove         = pata_buddha_remove,
 268 };
 269
 270 /*
 271  * We cannot have a modalias for X-Surf boards, as it competes with the
 272  * zorro8390 network driver. As a stopgap measure until we have proper
 273  * MFD support for this board, we manually attach to it late after Zorro
 274  * has enumerated its boards.
 275  */
 276 static int __init pata_buddha_late_init(void)
 277 {
 278         struct zorro_dev *z = NULL;
 279
 280         /* Auto-bind to regular boards */
 281         zorro_register_driver(&pata_buddha_driver);
 282
 283         /* Manually bind to all X-Surf boards */
 284         while ((z = zorro_find_device(ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, z))) {
 285                 static struct zorro_device_id xsurf_ent = {
 286                         ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, BOARD_XSURF
 287                 };
 288
 289                 pata_buddha_probe(z, &xsurf_ent);
 290         }
 291
 292         return 0;
 293 }
 294 late_initcall(pata_buddha_late_init);
 295
 296 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
 297 MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA");
 298 MODULE_LICENSE("GPL v2");
 299 MODULE_VERSION(DRV_VERSION);