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/module.h>
  22 #include <linux/zorro.h>
  23 #include <scsi/scsi_cmnd.h>
  24 #include <scsi/scsi_host.h>
  25
  26 #include <asm/amigahw.h>
  27 #include <asm/amigaints.h>
  28 #include <asm/ide.h>
  29 #include <asm/setup.h>
  30
  31 #define DRV_NAME "pata_buddha"
  32 #define DRV_VERSION "0.1.0"
  33
  34 #define BUDDHA_BASE1    0x800
  35 #define BUDDHA_BASE2    0xa00
  36 #define BUDDHA_BASE3    0xc00
  37 #define XSURF_BASE1     0xb000 /* 2.5" interface */
  38 #define XSURF_BASE2     0xd000 /* 3.5" interface */
  39 #define BUDDHA_CONTROL  0x11a
  40 #define BUDDHA_IRQ      0xf00
  41 #define XSURF_IRQ       0x7e
  42 #define BUDDHA_IRQ_MR   0xfc0   /* master interrupt enable */
  43
  44 enum {
  45         BOARD_BUDDHA = 0,
  46         BOARD_CATWEASEL,
  47         BOARD_XSURF
  48 };
  49
  50 static unsigned int buddha_bases[3] __initdata = {
  51         BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
  52 };
  53
  54 static unsigned int xsurf_bases[2] __initdata = {
  55         XSURF_BASE1, XSURF_BASE2
  56 };
  57
  58 static struct scsi_host_template pata_buddha_sht = {
  59         ATA_PIO_SHT(DRV_NAME),
  60 };
  61
  62 /* FIXME: is this needed? */
  63 static unsigned int pata_buddha_data_xfer(struct ata_queued_cmd *qc,
  64                                          unsigned char *buf,
  65                                          unsigned int buflen, int rw)
  66 {
  67         struct ata_device *dev = qc->dev;
  68         struct ata_port *ap = dev->link->ap;
  69         void __iomem *data_addr = ap->ioaddr.data_addr;
  70         unsigned int words = buflen >> 1;
  71
  72         /* Transfer multiple of 2 bytes */
  73         if (rw == READ)
  74                 raw_insw((u16 *)data_addr, (u16 *)buf, words);
  75         else
  76                 raw_outsw((u16 *)data_addr, (u16 *)buf, words);
  77
  78         /* Transfer trailing byte, if any. */
  79         if (unlikely(buflen & 0x01)) {
  80                 unsigned char pad[2] = { };
  81
  82                 /* Point buf to the tail of buffer */
  83                 buf += buflen - 1;
  84
  85                 if (rw == READ) {
  86                         raw_insw((u16 *)data_addr, (u16 *)pad, 1);
  87                         *buf = pad[0];
  88                 } else {
  89                         pad[0] = *buf;
  90                         raw_outsw((u16 *)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_buddha_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 bool pata_buddha_irq_check(struct ata_port *ap)
 118 {
 119         u8 ch;
 120
 121         ch = z_readb((unsigned long)ap->private_data);
 122
 123         return !!(ch & 0x80);
 124 }
 125
 126 static void pata_xsurf_irq_clear(struct ata_port *ap)
 127 {
 128         z_writeb(0, (unsigned long)ap->private_data);
 129 }
 130
 131 static struct ata_port_operations pata_buddha_ops = {
 132         .inherits       = &ata_sff_port_ops,
 133         .sff_data_xfer  = pata_buddha_data_xfer,
 134         .sff_irq_check  = pata_buddha_irq_check,
 135         .cable_detect   = ata_cable_unknown,
 136         .set_mode       = pata_buddha_set_mode,
 137 };
 138
 139 static struct ata_port_operations pata_xsurf_ops = {
 140         .inherits       = &ata_sff_port_ops,
 141         .sff_data_xfer  = pata_buddha_data_xfer,
 142         .sff_irq_check  = pata_buddha_irq_check,
 143         .sff_irq_clear  = pata_xsurf_irq_clear,
 144         .cable_detect   = ata_cable_unknown,
 145         .set_mode       = pata_buddha_set_mode,
 146 };
 147
 148 static int __init pata_buddha_init_one(void)
 149 {
 150         struct zorro_dev *z = NULL;
 151
 152         while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 153                 static const char *board_name[]
 154                         = { "Buddha", "Catweasel", "X-Surf" };
 155                 struct ata_host *host;
 156                 void __iomem *buddha_board;
 157                 unsigned long board;
 158                 unsigned int type, nr_ports = 2;
 159                 int i;
 160
 161                 if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
 162                         type = BOARD_BUDDHA;
 163                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
 164                         type = BOARD_CATWEASEL;
 165                         nr_ports++;
 166                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
 167                         type = BOARD_XSURF;
 168                 } else
 169                         continue;
 170
 171                 dev_info(&z->dev, "%s IDE controller\n", board_name[type]);
 172
 173                 board = z->resource.start;
 174
 175                 if (type != BOARD_XSURF) {
 176                         if (!devm_request_mem_region(&z->dev,
 177                                                      board + BUDDHA_BASE1,
 178                                                      0x800, DRV_NAME))
 179                                 continue;
 180                 } else {
 181                         if (!devm_request_mem_region(&z->dev,
 182                                                      board + XSURF_BASE1,
 183                                                      0x1000, DRV_NAME))
 184                                 continue;
 185                         if (!devm_request_mem_region(&z->dev,
 186                                                      board + XSURF_BASE2,
 187                                                      0x1000, DRV_NAME))
 188                                 continue;
 189                 }
 190
 191                 /* allocate host */
 192                 host = ata_host_alloc(&z->dev, nr_ports);
 193                 if (!host)
 194                         continue;
 195
 196                 buddha_board = ZTWO_VADDR(board);
 197
 198                 /* enable the board IRQ on Buddha/Catweasel */
 199                 if (type != BOARD_XSURF)
 200                         z_writeb(0, buddha_board + BUDDHA_IRQ_MR);
 201
 202                 for (i = 0; i < nr_ports; i++) {
 203                         struct ata_port *ap = host->ports[i];
 204                         void __iomem *base, *irqport;
 205                         unsigned long ctl = 0;
 206
 207                         if (type != BOARD_XSURF) {
 208                                 ap->ops = &pata_buddha_ops;
 209                                 base = buddha_board + buddha_bases[i];
 210                                 ctl = BUDDHA_CONTROL;
 211                                 irqport = buddha_board + BUDDHA_IRQ + i * 0x40;
 212                         } else {
 213                                 ap->ops = &pata_xsurf_ops;
 214                                 base = buddha_board + xsurf_bases[i];
 215                                 /* X-Surf has no CS1* (Control/AltStat) */
 216                                 irqport = buddha_board + XSURF_IRQ;
 217                         }
 218
 219                         ap->pio_mask = ATA_PIO4;
 220                         ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
 221
 222                         ap->ioaddr.data_addr            = base;
 223                         ap->ioaddr.error_addr           = base + 2 + 1 * 4;
 224                         ap->ioaddr.feature_addr         = base + 2 + 1 * 4;
 225                         ap->ioaddr.nsect_addr           = base + 2 + 2 * 4;
 226                         ap->ioaddr.lbal_addr            = base + 2 + 3 * 4;
 227                         ap->ioaddr.lbam_addr            = base + 2 + 4 * 4;
 228                         ap->ioaddr.lbah_addr            = base + 2 + 5 * 4;
 229                         ap->ioaddr.device_addr          = base + 2 + 6 * 4;
 230                         ap->ioaddr.status_addr          = base + 2 + 7 * 4;
 231                         ap->ioaddr.command_addr         = base + 2 + 7 * 4;
 232
 233                         if (ctl) {
 234                                 ap->ioaddr.altstatus_addr = base + ctl;
 235                                 ap->ioaddr.ctl_addr       = base + ctl;
 236                         }
 237
 238                         ap->private_data = (void *)irqport;
 239
 240                         ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", board,
 241                                       ctl ? board + buddha_bases[i] + ctl : 0);
 242                 }
 243
 244                 ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt,
 245                                   IRQF_SHARED, &pata_buddha_sht);
 246
 247         }
 248
 249         return 0;
 250 }
 251
 252 module_init(pata_buddha_init_one);
 253
 254 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
 255 MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA");
 256 MODULE_LICENSE("GPL v2");
 257 MODULE_VERSION(DRV_VERSION);