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/module.h>
  36 #include <linux/types.h>
  37 #include <linux/kernel.h>
  38 #include <linux/delay.h>
  39 #include <linux/timer.h>
  40 #include <linux/mm.h>
  41 #include <linux/ioport.h>
  42 #include <linux/blkdev.h>
  43 #include <linux/hdreg.h>
  44
  45 #include <linux/interrupt.h>
  46 #include <linux/init.h>
  47 #include <linux/pci.h>
  48 #include <linux/ide.h>
  49 #include <linux/dma-mapping.h>
  50
  51 #include <asm/io.h>
  52 #include <asm/irq.h>
  53
  54 struct pio_clocks
  55 {
  56         int address;
  57         int assert;
  58         int recovery;
  59 };
  60
  61 static struct pio_clocks cs5520_pio_clocks[]={
  62         {3, 6, 11},
  63         {2, 5, 6},
  64         {1, 4, 3},
  65         {1, 3, 2},
  66         {1, 2, 1}
  67 };
  68
  69 static void cs5520_set_pio_mode(ide_drive_t *drive, const u8 pio)
  70 {
  71         ide_hwif_t *hwif = HWIF(drive);
  72         struct pci_dev *pdev = hwif->pci_dev;
  73         int controller = drive->dn > 1 ? 1 : 0;
  74         u8 reg;
  75
  76         /* FIXME: if DMA = 1 do we need to set the DMA bit here ? */
  77
  78         /* 8bit CAT/CRT - 8bit command timing for channel */
  79         pci_write_config_byte(pdev, 0x62 + controller,
  80                 (cs5520_pio_clocks[pio].recovery << 4) |
  81                 (cs5520_pio_clocks[pio].assert));
  82
  83         /* 0x64 - 16bit Primary, 0x68 - 16bit Secondary */
  84
  85         /* FIXME: should these use address ? */
  86         /* Data read timing */
  87         pci_write_config_byte(pdev, 0x64 + 4*controller + (drive->dn&1),
  88                 (cs5520_pio_clocks[pio].recovery << 4) |
  89                 (cs5520_pio_clocks[pio].assert));
  90         /* Write command timing */
  91         pci_write_config_byte(pdev, 0x66 + 4*controller + (drive->dn&1),
  92                 (cs5520_pio_clocks[pio].recovery << 4) |
  93                 (cs5520_pio_clocks[pio].assert));
  94
  95         /* Set the DMA enable/disable flag */
  96         reg = inb(hwif->dma_base + 0x02 + 8*controller);
  97         reg |= 1<<((drive->dn&1)+5);
  98         outb(reg, hwif->dma_base + 0x02 + 8*controller);
  99 }
 100
 101 static void cs5520_set_dma_mode(ide_drive_t *drive, const u8 speed)
 102 {
 103         printk(KERN_ERR "cs55x0: bad ide timing.\n");
 104
 105         cs5520_set_pio_mode(drive, 0);
 106 }
 107
 108 /*
 109  *      We wrap the DMA activate to set the vdma flag. This is needed
 110  *      so that the IDE DMA layer issues PIO not DMA commands over the
 111  *      DMA channel
 112  */
 113
 114 static int cs5520_dma_on(ide_drive_t *drive)
 115 {
 116         /* ATAPI is harder so leave it for now */
 117         drive->vdma = 1;
 118         return 0;
 119 }
 120
 121 static void __devinit init_hwif_cs5520(ide_hwif_t *hwif)
 122 {
 123         hwif->set_pio_mode = &cs5520_set_pio_mode;
 124         hwif->set_dma_mode = &cs5520_set_dma_mode;
 125
 126         if (hwif->dma_base == 0) {
 127                 hwif->drives[1].autotune = hwif->drives[0].autotune = 1;
 128                 return;
 129         }
 130
 131         hwif->ide_dma_on = &cs5520_dma_on;
 132
 133         hwif->ultra_mask = 0;
 134         hwif->swdma_mask = 0;
 135         hwif->mwdma_mask = 0;
 136 }
 137
 138 #define DECLARE_CS_DEV(name_str)                                \
 139         {                                                       \
 140                 .name           = name_str,                     \
 141                 .init_hwif      = init_hwif_cs5520,             \
 142                 .host_flags     = IDE_HFLAG_ISA_PORTS |         \
 143                                   IDE_HFLAG_CS5520 |            \
 144                                   IDE_HFLAG_VDMA |              \
 145                                   IDE_HFLAG_NO_ATAPI_DMA |      \
 146                                   IDE_HFLAG_BOOTABLE,           \
 147                 .pio_mask       = ATA_PIO4,                     \
 148         }
 149
 150 static ide_pci_device_t cyrix_chipsets[] __devinitdata = {
 151         /* 0 */ DECLARE_CS_DEV("Cyrix 5510"),
 152         /* 1 */ DECLARE_CS_DEV("Cyrix 5520")
 153 };
 154
 155 /*
 156  *      The 5510/5520 are a bit weird. They don't quite set up the way
 157  *      the PCI helper layer expects so we must do much of the set up
 158  *      work longhand.
 159  */
 160
 161 static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 162 {
 163         ide_hwif_t *hwif = NULL, *mate = NULL;
 164         ata_index_t index;
 165         ide_pci_device_t *d = &cyrix_chipsets[id->driver_data];
 166
 167         ide_setup_pci_noise(dev, d);
 168
 169         /* We must not grab the entire device, it has 'ISA' space in its
 170            BARS too and we will freak out other bits of the kernel */
 171         if (pci_enable_device_bars(dev, 1<<2)) {
 172                 printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
 173                 return -ENODEV;
 174         }
 175         pci_set_master(dev);
 176         if (pci_set_dma_mask(dev, DMA_32BIT_MASK)) {
 177                 printk(KERN_WARNING "cs5520: No suitable DMA available.\n");
 178                 return -ENODEV;
 179         }
 180
 181         index.all = 0xf0f0;
 182
 183         /*
 184          *      Now the chipset is configured we can let the core
 185          *      do all the device setup for us
 186          */
 187
 188         ide_pci_setup_ports(dev, d, 14, &index);
 189
 190         if ((index.b.low & 0xf0) != 0xf0)
 191                 hwif = &ide_hwifs[index.b.low];
 192         if ((index.b.high & 0xf0) != 0xf0)
 193                 mate = &ide_hwifs[index.b.high];
 194
 195         if (hwif)
 196                 probe_hwif_init(hwif);
 197         if (mate)
 198                 probe_hwif_init(mate);
 199
 200         if (hwif)
 201                 ide_proc_register_port(hwif);
 202         if (mate)
 203                 ide_proc_register_port(mate);
 204
 205         return 0;
 206 }
 207
 208 static const struct pci_device_id cs5520_pci_tbl[] = {
 209         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), 0 },
 210         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), 1 },
 211         { 0, },
 212 };
 213 MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl);
 214
 215 static struct pci_driver driver = {
 216         .name           = "Cyrix_IDE",
 217         .id_table       = cs5520_pci_tbl,
 218         .probe          = cs5520_init_one,
 219 };
 220
 221 static int __init cs5520_ide_init(void)
 222 {
 223         return ide_pci_register_driver(&driver);
 224 }
 225
 226 module_init(cs5520_ide_init);
 227
 228 MODULE_AUTHOR("Alan Cox");
 229 MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE");
 230 MODULE_LICENSE("GPL");