drivers/ide/pci/cs5520.c

   1 /*
   2  *      IDE tuning and bus mastering support for the CS5510/CS5520
   3  *      chipsets
   4  *
   5  *      The CS5510/CS5520 are slightly unusual devices. Unlike the
   6  *      typical IDE controllers they do bus mastering with the drive in
   7  *      PIO mode and smarter silicon.
   8  *
   9  *      The practical upshot of this is that we must always tune the
  10  *      drive for the right PIO mode. We must also ignore all the blacklists
  11  *      and the drive bus mastering DMA information.
  12  *
  13  *      *** This driver is strictly experimental ***
  14  *
  15  *      (c) Copyright Red Hat Inc 2002
  16  *
  17  * This program is free software; you can redistribute it and/or modify it
  18  * under the terms of the GNU General Public License as published by the
  19  * Free Software Foundation; either version 2, or (at your option) any
  20  * later version.
  21  *
  22  * This program is distributed in the hope that it will be useful, but
  23  * WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  25  * General Public License for more details.
  26  *
  27  * For the avoidance of doubt the "preferred form" of this code is one which
  28  * is in an open non patent encumbered format. Where cryptographic key signing
  29  * forms part of the process of creating an executable the information
  30  * including keys needed to generate an equivalently functional executable
  31  * are deemed to be part of the source code.
  32  *
  33  */
  34
  35 #include <linux/config.h>
  36 #include <linux/module.h>
  37 #include <linux/types.h>
  38 #include <linux/kernel.h>
  39 #include <linux/delay.h>
  40 #include <linux/timer.h>
  41 #include <linux/mm.h>
  42 #include <linux/ioport.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/hdreg.h>
  45
  46 #include <linux/interrupt.h>
  47 #include <linux/init.h>
  48 #include <linux/pci.h>
  49 #include <linux/ide.h>
  50 #include <linux/dma-mapping.h>
  51
  52 #include <asm/io.h>
  53 #include <asm/irq.h>
  54
  55 struct pio_clocks
  56 {
  57         int address;
  58         int assert;
  59         int recovery;
  60 };
  61
  62 static struct pio_clocks cs5520_pio_clocks[]={
  63         {3, 6, 11},
  64         {2, 5, 6},
  65         {1, 4, 3},
  66         {1, 3, 2},
  67         {1, 2, 1}
  68 };
  69
  70 static int cs5520_tune_chipset(ide_drive_t *drive, u8 xferspeed)
  71 {
  72         ide_hwif_t *hwif = HWIF(drive);
  73         struct pci_dev *pdev = hwif->pci_dev;
  74         u8 speed = min((u8)XFER_PIO_4, xferspeed);
  75         int pio = speed;
  76         u8 reg;
  77         int controller = drive->dn > 1 ? 1 : 0;
  78         int error;
  79
  80         switch(speed)
  81         {
  82                 case XFER_PIO_4:
  83                 case XFER_PIO_3:
  84                 case XFER_PIO_2:
  85                 case XFER_PIO_1:
  86                 case XFER_PIO_0:
  87                         pio -= XFER_PIO_0;
  88                         break;
  89                 default:
  90                         pio = 0;
  91                         printk(KERN_ERR "cs55x0: bad ide timing.\n");
  92         }
  93
  94         printk("PIO clocking = %d\n", pio);
  95
  96         /* FIXME: if DMA = 1 do we need to set the DMA bit here ? */
  97
  98         /* 8bit CAT/CRT - 8bit command timing for channel */
  99         pci_write_config_byte(pdev, 0x62 + controller,
 100                 (cs5520_pio_clocks[pio].recovery << 4) |
 101                 (cs5520_pio_clocks[pio].assert));
 102
 103         /* 0x64 - 16bit Primary, 0x68 - 16bit Secondary */
 104
 105         /* FIXME: should these use address ? */
 106         /* Data read timing */
 107         pci_write_config_byte(pdev, 0x64 + 4*controller + (drive->dn&1),
 108                 (cs5520_pio_clocks[pio].recovery << 4) |
 109                 (cs5520_pio_clocks[pio].assert));
 110         /* Write command timing */
 111         pci_write_config_byte(pdev, 0x66 + 4*controller + (drive->dn&1),
 112                 (cs5520_pio_clocks[pio].recovery << 4) |
 113                 (cs5520_pio_clocks[pio].assert));
 114
 115         /* Set the DMA enable/disable flag */
 116         reg = inb(hwif->dma_base + 0x02 + 8*controller);
 117         reg |= 1<<((drive->dn&1)+5);
 118         outb(reg, hwif->dma_base + 0x02 + 8*controller);
 119
 120         error = ide_config_drive_speed(drive, speed);
 121         /* ATAPI is harder so leave it for now */
 122         if(!error && drive->media == ide_disk)
 123                 error = hwif->ide_dma_on(drive);
 124
 125         return error;
 126 }
 127
 128 static void cs5520_tune_drive(ide_drive_t *drive, u8 pio)
 129 {
 130         pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
 131         cs5520_tune_chipset(drive, (XFER_PIO_0 + pio));
 132 }
 133
 134 static int cs5520_config_drive_xfer_rate(ide_drive_t *drive)
 135 {
 136         ide_hwif_t *hwif = HWIF(drive);
 137
 138         /* Tune the drive for PIO modes up to PIO 4 */
 139         cs5520_tune_drive(drive, 4);
 140         /* Then tell the core to use DMA operations */
 141         return hwif->ide_dma_on(drive);
 142 }
 143
 144 /*
 145  *      We provide a callback for our nonstandard DMA location
 146  */
 147
 148 static void __devinit cs5520_init_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif)
 149 {
 150         unsigned long bmide = pci_resource_start(dev, 2);       /* Not the usual 4 */
 151         if(hwif->mate && hwif->mate->dma_base)  /* Second channel at primary + 8 */
 152                 bmide += 8;
 153         ide_setup_dma(hwif, bmide, 8);
 154 }
 155
 156 /*
 157  *      We wrap the DMA activate to set the vdma flag. This is needed
 158  *      so that the IDE DMA layer issues PIO not DMA commands over the
 159  *      DMA channel
 160  */
 161
 162 static int cs5520_dma_on(ide_drive_t *drive)
 163 {
 164         drive->vdma = 1;
 165         return 0;
 166 }
 167
 168 static void __devinit init_hwif_cs5520(ide_hwif_t *hwif)
 169 {
 170         hwif->tuneproc = &cs5520_tune_drive;
 171         hwif->speedproc = &cs5520_tune_chipset;
 172         hwif->ide_dma_check = &cs5520_config_drive_xfer_rate;
 173         hwif->ide_dma_on = &cs5520_dma_on;
 174
 175         if(!noautodma)
 176                 hwif->autodma = 1;
 177
 178         if(!hwif->dma_base)
 179         {
 180                 hwif->drives[0].autotune = 1;
 181                 hwif->drives[1].autotune = 1;
 182                 return;
 183         }
 184
 185         hwif->atapi_dma = 0;
 186         hwif->ultra_mask = 0;
 187         hwif->swdma_mask = 0;
 188         hwif->mwdma_mask = 0;
 189
 190         hwif->drives[0].autodma = hwif->autodma;
 191         hwif->drives[1].autodma = hwif->autodma;
 192 }
 193
 194 #define DECLARE_CS_DEV(name_str)                                \
 195         {                                                       \
 196                 .name           = name_str,                     \
 197                 .init_setup_dma = cs5520_init_setup_dma,        \
 198                 .init_hwif      = init_hwif_cs5520,             \
 199                 .channels       = 2,                            \
 200                 .autodma        = AUTODMA,                      \
 201                 .bootable       = ON_BOARD,                     \
 202                 .flags          = IDEPCI_FLAG_ISA_PORTS,        \
 203         }
 204
 205 static ide_pci_device_t cyrix_chipsets[] __devinitdata = {
 206         /* 0 */ DECLARE_CS_DEV("Cyrix 5510"),
 207         /* 1 */ DECLARE_CS_DEV("Cyrix 5520")
 208 };
 209
 210 /*
 211  *      The 5510/5520 are a bit weird. They don't quite set up the way
 212  *      the PCI helper layer expects so we must do much of the set up
 213  *      work longhand.
 214  */
 215
 216 static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 217 {
 218         ata_index_t index;
 219         ide_pci_device_t *d = &cyrix_chipsets[id->driver_data];
 220
 221         ide_setup_pci_noise(dev, d);
 222
 223         /* We must not grab the entire device, it has 'ISA' space in its
 224            BARS too and we will freak out other bits of the kernel */
 225         if(pci_enable_device_bars(dev, 1<<2))
 226         {
 227                 printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
 228                 return 1;
 229         }
 230         pci_set_master(dev);
 231         if (pci_set_dma_mask(dev, DMA_32BIT_MASK)) {
 232                 printk(KERN_WARNING "cs5520: No suitable DMA available.\n");
 233                 return -ENODEV;
 234         }
 235
 236         index.all = 0xf0f0;
 237
 238         /*
 239          *      Now the chipset is configured we can let the core
 240          *      do all the device setup for us
 241          */
 242
 243         ide_pci_setup_ports(dev, d, 14, &index);
 244
 245         if((index.b.low & 0xf0) != 0xf0)
 246                 probe_hwif_init(&ide_hwifs[index.b.low]);
 247         if((index.b.high & 0xf0) != 0xf0)
 248                 probe_hwif_init(&ide_hwifs[index.b.high]);
 249         return 0;
 250 }
 251
 252 static struct pci_device_id cs5520_pci_tbl[] = {
 253         { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5510, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 254         { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5520, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
 255         { 0, },
 256 };
 257 MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl);
 258
 259 static struct pci_driver driver = {
 260         .name           = "Cyrix_IDE",
 261         .id_table       = cs5520_pci_tbl,
 262         .probe          = cs5520_init_one,
 263 };
 264
 265 static int cs5520_ide_init(void)
 266 {
 267         return ide_pci_register_driver(&driver);
 268 }
 269
 270 module_init(cs5520_ide_init);
 271
 272 MODULE_AUTHOR("Alan Cox");
 273 MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE");
 274 MODULE_LICENSE("GPL");