release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include <irq.h>
  22
  23 /*
  24  * PCI slot numbers
  25  */
  26 #define COBALT_PCICONF_CPU      0x06
  27 #define COBALT_PCICONF_ETH0     0x07
  28 #define COBALT_PCICONF_RAQSCSI  0x08
  29 #define COBALT_PCICONF_VIA      0x09
  30 #define COBALT_PCICONF_PCISLOT  0x0A
  31 #define COBALT_PCICONF_ETH1     0x0C
  32
  33 /*
  34  * The Cobalt board ID information.  The boards have an ID number wired
  35  * into the VIA that is available in the high nibble of register 94.
  36  */
  37 #define VIA_COBALT_BRD_ID_REG  0x94
  38 #define VIA_COBALT_BRD_REG_to_ID(reg)   ((unsigned char)(reg) >> 4)
  39
  40 static void qube_raq_galileo_early_fixup(struct pci_dev *dev)
  41 {
  42         if (dev->devfn == PCI_DEVFN(0, 0) &&
  43                 (dev->class >> 8) == PCI_CLASS_MEMORY_OTHER) {
  44
  45                 dev->class = (PCI_CLASS_BRIDGE_HOST << 8) | (dev->class & 0xff);
  46
  47                 printk(KERN_INFO "Galileo: fixed bridge class\n");
  48         }
  49 }
  50
  51 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_GT64111,
  52          qube_raq_galileo_early_fixup);
  53
  54 static void __devinit cobalt_legacy_ide_resource_fixup(struct pci_dev *dev,
  55                                                        struct resource *res)
  56 {
  57         struct pci_controller *hose = (struct pci_controller *)dev->sysdata;
  58         unsigned long offset = hose->io_offset;
  59         struct resource orig = *res;
  60
  61         if (!(res->flags & IORESOURCE_IO) ||
  62             !(res->flags & IORESOURCE_PCI_FIXED))
  63                 return;
  64
  65         res->start -= offset;
  66         res->end -= offset;
  67         dev_printk(KERN_DEBUG, &dev->dev, "converted legacy %pR to bus %pR\n",
  68                    &orig, res);
  69 }
  70
  71 static void __devinit cobalt_legacy_ide_fixup(struct pci_dev *dev)
  72 {
  73         u32 class;
  74         u8 progif;
  75
  76         /*
  77          * If the IDE controller is in legacy mode, pci_setup_device() fills in
  78          * the resources with the legacy addresses that normally appear on the
  79          * PCI bus, just as if we had read them from a BAR.
  80          *
  81          * However, with the GT-64111, those legacy addresses, e.g., 0x1f0,
  82          * will never appear on the PCI bus because it converts memory accesses
  83          * in the PCI I/O region (which is never at address zero) into I/O port
  84          * accesses with no address translation.
  85          *
  86          * For example, if GT_DEF_PCI0_IO_BASE is 0x10000000, a load or store
  87          * to physical address 0x100001f0 will become a PCI access to I/O port
  88          * 0x100001f0.  There's no way to generate an access to I/O port 0x1f0,
  89          * but the VT82C586 IDE controller does respond at 0x100001f0 because
  90          * it only decodes the low 24 bits of the address.
  91          *
  92          * When this quirk runs, the pci_dev resources should contain bus
  93          * addresses, not Linux I/O port numbers, so convert legacy addresses
  94          * like 0x1f0 to bus addresses like 0x100001f0.  Later, we'll convert
  95          * them back with pcibios_fixup_bus() or pcibios_bus_to_resource().
  96          */
  97         class = dev->class >> 8;
  98         if (class != PCI_CLASS_STORAGE_IDE)
  99                 return;
 100
 101         pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
 102         if ((progif & 1) == 0) {
 103                 cobalt_legacy_ide_resource_fixup(dev, &dev->resource[0]);
 104                 cobalt_legacy_ide_resource_fixup(dev, &dev->resource[1]);
 105         }
 106         if ((progif & 4) == 0) {
 107                 cobalt_legacy_ide_resource_fixup(dev, &dev->resource[2]);
 108                 cobalt_legacy_ide_resource_fixup(dev, &dev->resource[3]);
 109         }
 110 }
 111
 112 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1,
 113           cobalt_legacy_ide_fixup);
 114
 115 static void qube_raq_via_bmIDE_fixup(struct pci_dev *dev)
 116 {
 117         unsigned short cfgword;
 118         unsigned char lt;
 119
 120         /* Enable Bus Mastering and fast back to back. */
 121         pci_read_config_word(dev, PCI_COMMAND, &cfgword);
 122         cfgword |= (PCI_COMMAND_FAST_BACK | PCI_COMMAND_MASTER);
 123         pci_write_config_word(dev, PCI_COMMAND, cfgword);
 124
 125         /* Enable both ide interfaces. ROM only enables primary one.  */
 126         pci_write_config_byte(dev, 0x40, 0xb);
 127
 128         /* Set latency timer to reasonable value. */
 129         pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lt);
 130         if (lt < 64)
 131                 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
 132         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 8);
 133 }
 134
 135 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1,
 136          qube_raq_via_bmIDE_fixup);
 137
 138 static void qube_raq_galileo_fixup(struct pci_dev *dev)
 139 {
 140         if (dev->devfn != PCI_DEVFN(0, 0))
 141                 return;
 142
 143         /* Fix PCI latency-timer and cache-line-size values in Galileo
 144          * host bridge.
 145          */
 146         pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
 147         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 8);
 148
 149         /*
 150          * The code described by the comment below has been removed
 151          * as it causes bus mastering by the Ethernet controllers
 152          * to break under any kind of network load. We always set
 153          * the retry timeouts to their maximum.
 154          *
 155          * --x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--x--
 156          *
 157          * On all machines prior to Q2, we had the STOP line disconnected
 158          * from Galileo to VIA on PCI.  The new Galileo does not function
 159          * correctly unless we have it connected.
 160          *
 161          * Therefore we must set the disconnect/retry cycle values to
 162          * something sensible when using the new Galileo.
 163          */
 164
 165         printk(KERN_INFO "Galileo: revision %u\n", dev->revision);
 166
 167         {
 168                 signed int timeo;
 169                 timeo = GT_READ(GT_PCI0_TOR_OFS);
 170                 /* Old Galileo, assumes PCI STOP line to VIA is disconnected. */
 171                 GT_WRITE(GT_PCI0_TOR_OFS,
 172                         (0xff << 16) |          /* retry count */
 173                         (0xff << 8) |           /* timeout 1   */
 174                         0xff);                  /* timeout 0   */
 175
 176                 /* enable PCI retry exceeded interrupt */
 177                 GT_WRITE(GT_INTRMASK_OFS, GT_INTR_RETRYCTR0_MSK | GT_READ(GT_INTRMASK_OFS));
 178         }
 179 }
 180
 181 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_GT64111,
 182          qube_raq_galileo_fixup);
 183
 184 int cobalt_board_id;
 185
 186 static void qube_raq_via_board_id_fixup(struct pci_dev *dev)
 187 {
 188         u8 id;
 189         int retval;
 190
 191         retval = pci_read_config_byte(dev, VIA_COBALT_BRD_ID_REG, &id);
 192         if (retval) {
 193                 panic("Cannot read board ID");
 194                 return;
 195         }
 196
 197         cobalt_board_id = VIA_COBALT_BRD_REG_to_ID(id);
 198
 199         printk(KERN_INFO "Cobalt board ID: %d\n", cobalt_board_id);
 200 }
 201
 202 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_0,
 203          qube_raq_via_board_id_fixup);
 204
 205 static char irq_tab_qube1[] __initdata = {
 206   [COBALT_PCICONF_CPU]     = 0,
 207   [COBALT_PCICONF_ETH0]    = QUBE1_ETH0_IRQ,
 208   [COBALT_PCICONF_RAQSCSI] = SCSI_IRQ,
 209   [COBALT_PCICONF_VIA]     = 0,
 210   [COBALT_PCICONF_PCISLOT] = PCISLOT_IRQ,
 211   [COBALT_PCICONF_ETH1]    = 0
 212 };
 213
 214 static char irq_tab_cobalt[] __initdata = {
 215   [COBALT_PCICONF_CPU]     = 0,
 216   [COBALT_PCICONF_ETH0]    = ETH0_IRQ,
 217   [COBALT_PCICONF_RAQSCSI] = SCSI_IRQ,
 218   [COBALT_PCICONF_VIA]     = 0,
 219   [COBALT_PCICONF_PCISLOT] = PCISLOT_IRQ,
 220   [COBALT_PCICONF_ETH1]    = ETH1_IRQ
 221 };
 222
 223 static char irq_tab_raq2[] __initdata = {
 224   [COBALT_PCICONF_CPU]     = 0,
 225   [COBALT_PCICONF_ETH0]    = ETH0_IRQ,
 226   [COBALT_PCICONF_RAQSCSI] = RAQ2_SCSI_IRQ,
 227   [COBALT_PCICONF_VIA]     = 0,
 228   [COBALT_PCICONF_PCISLOT] = PCISLOT_IRQ,
 229   [COBALT_PCICONF_ETH1]    = ETH1_IRQ
 230 };
 231
 232 int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 233 {
 234         if (cobalt_board_id <= COBALT_BRD_ID_QUBE1)
 235                 return irq_tab_qube1[slot];
 236
 237         if (cobalt_board_id == COBALT_BRD_ID_RAQ2)
 238                 return irq_tab_raq2[slot];
 239
 240         return irq_tab_cobalt[slot];
 241 }
 242
 243 /* Do platform specific device initialization at pci_enable_device() time */
 244 int pcibios_plat_dev_init(struct pci_dev *dev)
 245 {
 246         return 0;
 247 }