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
  75         /* FIXME: if DMA = 1 do we need to set the DMA bit here ? */
  76
  77         /* 8bit CAT/CRT - 8bit command timing for channel */
  78         pci_write_config_byte(pdev, 0x62 + controller,
  79                 (cs5520_pio_clocks[pio].recovery << 4) |
  80                 (cs5520_pio_clocks[pio].assert));
  81
  82         /* 0x64 - 16bit Primary, 0x68 - 16bit Secondary */
  83
  84         /* FIXME: should these use address ? */
  85         /* Data read timing */
  86         pci_write_config_byte(pdev, 0x64 + 4*controller + (drive->dn&1),
  87                 (cs5520_pio_clocks[pio].recovery << 4) |
  88                 (cs5520_pio_clocks[pio].assert));
  89         /* Write command timing */
  90         pci_write_config_byte(pdev, 0x66 + 4*controller + (drive->dn&1),
  91                 (cs5520_pio_clocks[pio].recovery << 4) |
  92                 (cs5520_pio_clocks[pio].assert));
  93 }
  94
  95 static void cs5520_set_dma_mode(ide_drive_t *drive, const u8 speed)
  96 {
  97         printk(KERN_ERR "cs55x0: bad ide timing.\n");
  98
  99         cs5520_set_pio_mode(drive, 0);
 100 }
 101
 102 /*
 103  *      We wrap the DMA activate to set the vdma flag. This is needed
 104  *      so that the IDE DMA layer issues PIO not DMA commands over the
 105  *      DMA channel
 106  *
 107  *      ATAPI is harder so disable it for now using IDE_HFLAG_NO_ATAPI_DMA
 108  */
 109
 110 static void cs5520_dma_host_set(ide_drive_t *drive, int on)
 111 {
 112         drive->vdma = on;
 113         ide_dma_host_set(drive, on);
 114 }
 115
 116 static void __devinit init_hwif_cs5520(ide_hwif_t *hwif)
 117 {
 118         hwif->set_pio_mode = &cs5520_set_pio_mode;
 119         hwif->set_dma_mode = &cs5520_set_dma_mode;
 120
 121         if (hwif->dma_base == 0)
 122                 return;
 123
 124         hwif->dma_host_set = &cs5520_dma_host_set;
 125 }
 126
 127 #define DECLARE_CS_DEV(name_str)                                \
 128         {                                                       \
 129                 .name           = name_str,                     \
 130                 .init_hwif      = init_hwif_cs5520,             \
 131                 .host_flags     = IDE_HFLAG_ISA_PORTS |         \
 132                                   IDE_HFLAG_CS5520 |            \
 133                                   IDE_HFLAG_VDMA |              \
 134                                   IDE_HFLAG_NO_ATAPI_DMA |      \
 135                                   IDE_HFLAG_ABUSE_SET_DMA_MODE |\
 136                                   IDE_HFLAG_BOOTABLE,           \
 137                 .pio_mask       = ATA_PIO4,                     \
 138         }
 139
 140 static const struct ide_port_info cyrix_chipsets[] __devinitdata = {
 141         /* 0 */ DECLARE_CS_DEV("Cyrix 5510"),
 142         /* 1 */ DECLARE_CS_DEV("Cyrix 5520")
 143 };
 144
 145 /*
 146  *      The 5510/5520 are a bit weird. They don't quite set up the way
 147  *      the PCI helper layer expects so we must do much of the set up
 148  *      work longhand.
 149  */
 150
 151 static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 152 {
 153         const struct ide_port_info *d = &cyrix_chipsets[id->driver_data];
 154         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 155
 156         ide_setup_pci_noise(dev, d);
 157
 158         /* We must not grab the entire device, it has 'ISA' space in its
 159            BARS too and we will freak out other bits of the kernel */
 160         if (pci_enable_device_bars(dev, 1<<2)) {
 161                 printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
 162                 return -ENODEV;
 163         }
 164         pci_set_master(dev);
 165         if (pci_set_dma_mask(dev, DMA_32BIT_MASK)) {
 166                 printk(KERN_WARNING "cs5520: No suitable DMA available.\n");
 167                 return -ENODEV;
 168         }
 169
 170         /*
 171          *      Now the chipset is configured we can let the core
 172          *      do all the device setup for us
 173          */
 174
 175         ide_pci_setup_ports(dev, d, 14, &idx[0]);
 176
 177         ide_device_add(idx);
 178
 179         return 0;
 180 }
 181
 182 static const struct pci_device_id cs5520_pci_tbl[] = {
 183         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), 0 },
 184         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), 1 },
 185         { 0, },
 186 };
 187 MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl);
 188
 189 static struct pci_driver driver = {
 190         .name           = "Cyrix_IDE",
 191         .id_table       = cs5520_pci_tbl,
 192         .probe          = cs5520_init_one,
 193 };
 194
 195 static int __init cs5520_ide_init(void)
 196 {
 197         return ide_pci_register_driver(&driver);
 198 }
 199
 200 module_init(cs5520_ide_init);
 201
 202 MODULE_AUTHOR("Alan Cox");
 203 MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE");
 204 MODULE_LICENSE("GPL");