arch/mips/pci/fixup-cobalt.c

   1 /*
   2  * Cobalt Qube/Raq PCI support
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 1995, 1996, 1997, 2002, 2003 by Ralf Baechle
   9  * Copyright (C) 2001, 2002, 2003 by Liam Davies (ldavies@agile.tv)
  10  */
  11 #include <linux/types.h>
  12 #include <linux/pci.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15
  16 #include <asm/pci.h>
  17 #include <asm/io.h>
  18 #include <asm/gt64120.h>
  19
  20 #include <cobalt.h>
  21
  22 static void qube_raq_galileo_early_fixup(struct pci_dev *dev)
  23 {
  24         if (dev->devfn == PCI_DEVFN(0, 0) &&
  25                 (dev->class >> 8) == PCI_CLASS_MEMORY_OTHER) {
  26
  27                 dev->class = (PCI_CLASS_BRIDGE_HOST << 8) | (dev->class & 0xff);
  28
  29                 printk(KERN_INFO "Galileo: fixed bridge class\n");
  30         }
  31 }
  32
  33 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_GT64111,
  34          qube_raq_galileo_early_fixup);
  35
  36 static void qube_raq_via_bmIDE_fixup(struct pci_dev *dev)
  37 {
  38         unsigned short cfgword;
  39         unsigned char lt;
  40
  41         /* Enable Bus Mastering and fast back to back. */
  42         pci_read_config_word(dev, PCI_COMMAND, &cfgword);
  43         cfgword |= (PCI_COMMAND_FAST_BACK | PCI_COMMAND_MASTER);
  44         pci_write_config_word(dev, PCI_COMMAND, cfgword);
  45
  46         /* Enable both ide interfaces. ROM only enables primary one.  */
  47         pci_write_config_byte(dev, 0x40, 0xb);
  48
  49         /* Set latency timer to reasonable value. */
  50         pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lt);
  51         if (lt < 64)
  52                 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
  53         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 8);
  54 }
  55
  56 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1,
  57          qube_raq_via_bmIDE_fixup);
  58
  59 static void qube_raq_galileo_fixup(struct pci_dev *dev)
  60 {
  61         if (dev->devfn != PCI_DEVFN(0, 0))
  62                 return;
  63
  64         /* Fix PCI latency-timer and cache-line-size values in Galileo
  65          * host bridge.
  66          */
  67         pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
  68         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 8);
  69
  70         /*
  71          * The code described by the comment below has been removed
  72          * as it causes bus mastering by the Ethernet controllers
  73          * to break under any kind of network load. We always set
  74          * the retry timeouts to their maximum.
  75          *
  76          * --x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--
  77          *
  78          * On all machines prior to Q2, we had the STOP line disconnected
  79          * from Galileo to VIA on PCI.  The new Galileo does not function
  80          * correctly unless we have it connected.
  81          *
  82          * Therefore we must set the disconnect/retry cycle values to
  83          * something sensible when using the new Galileo.
  84          */
  85
  86         printk(KERN_INFO "Galileo: revision %u\n", dev->revision);
  87
  88 #if 0
  89         if (dev->revision >= 0x10) {
  90                 /* New Galileo, assumes PCI stop line to VIA is connected. */
  91                 GT_WRITE(GT_PCI0_TOR_OFS, 0x4020);
  92         } else if (dev->revision == 0x1 || dev->revision == 0x2)
  93 #endif
  94         {
  95                 signed int timeo;
  96                 /* XXX WE MUST DO THIS ELSE GALILEO LOCKS UP! -DaveM */
  97                 timeo = GT_READ(GT_PCI0_TOR_OFS);
  98                 /* Old Galileo, assumes PCI STOP line to VIA is disconnected. */
  99                 GT_WRITE(GT_PCI0_TOR_OFS,
 100                         (0xff << 16) |          /* retry count */
 101                         (0xff << 8) |           /* timeout 1   */
 102                         0xff);                  /* timeout 0   */
 103
 104                 /* enable PCI retry exceeded interrupt */
 105                 GT_WRITE(GT_INTRMASK_OFS, GT_INTR_RETRYCTR0_MSK | GT_READ(GT_INTRMASK_OFS));
 106         }
 107 }
 108
 109 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_GT64111,
 110          qube_raq_galileo_fixup);
 111
 112 int cobalt_board_id;
 113
 114 static void qube_raq_via_board_id_fixup(struct pci_dev *dev)
 115 {
 116         u8 id;
 117         int retval;
 118
 119         retval = pci_read_config_byte(dev, VIA_COBALT_BRD_ID_REG, &id);
 120         if (retval) {
 121                 panic("Cannot read board ID");
 122                 return;
 123         }
 124
 125         cobalt_board_id = VIA_COBALT_BRD_REG_to_ID(id);
 126
 127         printk(KERN_INFO "Cobalt board ID: %d\n", cobalt_board_id);
 128 }
 129
 130 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_0,
 131          qube_raq_via_board_id_fixup);
 132
 133 static char irq_tab_qube1[] __initdata = {
 134   [COBALT_PCICONF_CPU]     = 0,
 135   [COBALT_PCICONF_ETH0]    = COBALT_QUBE1_ETH0_IRQ,
 136   [COBALT_PCICONF_RAQSCSI] = COBALT_SCSI_IRQ,
 137   [COBALT_PCICONF_VIA]     = 0,
 138   [COBALT_PCICONF_PCISLOT] = COBALT_QUBE_SLOT_IRQ,
 139   [COBALT_PCICONF_ETH1]    = 0
 140 };
 141
 142 static char irq_tab_cobalt[] __initdata = {
 143   [COBALT_PCICONF_CPU]     = 0,
 144   [COBALT_PCICONF_ETH0]    = COBALT_ETH0_IRQ,
 145   [COBALT_PCICONF_RAQSCSI] = COBALT_SCSI_IRQ,
 146   [COBALT_PCICONF_VIA]     = 0,
 147   [COBALT_PCICONF_PCISLOT] = COBALT_QUBE_SLOT_IRQ,
 148   [COBALT_PCICONF_ETH1]    = COBALT_ETH1_IRQ
 149 };
 150
 151 static char irq_tab_raq2[] __initdata = {
 152   [COBALT_PCICONF_CPU]     = 0,
 153   [COBALT_PCICONF_ETH0]    = COBALT_ETH0_IRQ,
 154   [COBALT_PCICONF_RAQSCSI] = COBALT_RAQ_SCSI_IRQ,
 155   [COBALT_PCICONF_VIA]     = 0,
 156   [COBALT_PCICONF_PCISLOT] = COBALT_QUBE_SLOT_IRQ,
 157   [COBALT_PCICONF_ETH1]    = COBALT_ETH1_IRQ
 158 };
 159
 160 int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 161 {
 162         if (cobalt_board_id < COBALT_BRD_ID_QUBE2)
 163                 return irq_tab_qube1[slot];
 164
 165         if (cobalt_board_id == COBALT_BRD_ID_RAQ2)
 166                 return irq_tab_raq2[slot];
 167
 168         return irq_tab_cobalt[slot];
 169 }
 170
 171 /* Do platform specific device initialization at pci_enable_device() time */
 172 int pcibios_plat_dev_init(struct pci_dev *dev)
 173 {
 174         return 0;
 175 }