LXR linux/arch/mips/pci/fixup-malta.c

   1#include <linux/init.h>
   2#include <linux/pci.h>
   3
   4/* PCI interrupt pins */
   5#define PCIA            1
   6#define PCIB            2
   7#define PCIC            3
   8#define PCID            4
   9
  10/* This table is filled in by interrogating the PIIX4 chip */
  11static char pci_irq[5] __initdata;
  12
  13static char irq_tab[][5] __initdata = {
  14        /*      INTA    INTB    INTC    INTD */
  15        {0,     0,      0,      0,      0 },    /*  0: GT64120 PCI bridge */
  16        {0,     0,      0,      0,      0 },    /*  1: Unused */
  17        {0,     0,      0,      0,      0 },    /*  2: Unused */
  18        {0,     0,      0,      0,      0 },    /*  3: Unused */
  19        {0,     0,      0,      0,      0 },    /*  4: Unused */
  20        {0,     0,      0,      0,      0 },    /*  5: Unused */
  21        {0,     0,      0,      0,      0 },    /*  6: Unused */
  22        {0,     0,      0,      0,      0 },    /*  7: Unused */
  23        {0,     0,      0,      0,      0 },    /*  8: Unused */
  24        {0,     0,      0,      0,      0 },    /*  9: Unused */
  25        {0,     0,      0,      0,      PCID }, /* 10: PIIX4 USB */
  26        {0,     PCIB,   0,      0,      0 },    /* 11: AMD 79C973 Ethernet */
  27        {0,     PCIC,   0,      0,      0 },    /* 12: Crystal 4281 Sound */
  28        {0,     0,      0,      0,      0 },    /* 13: Unused */
  29        {0,     0,      0,      0,      0 },    /* 14: Unused */
  30        {0,     0,      0,      0,      0 },    /* 15: Unused */
  31        {0,     0,      0,      0,      0 },    /* 16: Unused */
  32        {0,     0,      0,      0,      0 },    /* 17: Bonito/SOC-it PCI Bridge*/
  33        {0,     PCIA,   PCIB,   PCIC,   PCID }, /* 18: PCI Slot 1 */
  34        {0,     PCIB,   PCIC,   PCID,   PCIA }, /* 19: PCI Slot 2 */
  35        {0,     PCIC,   PCID,   PCIA,   PCIB }, /* 20: PCI Slot 3 */
  36        {0,     PCID,   PCIA,   PCIB,   PCIC }  /* 21: PCI Slot 4 */
  37};
  38
  39int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  40{
  41        int virq;
  42        virq = irq_tab[slot][pin];
  43        return pci_irq[virq];
  44}
  45
  46/* Do platform specific device initialization at pci_enable_device() time */
  47int pcibios_plat_dev_init(struct pci_dev *dev)
  48{
  49        return 0;
  50}
  51
  52static void __init malta_piix_func0_fixup(struct pci_dev *pdev)
  53{
  54        unsigned char reg_val;
  55        static int piixirqmap[16] __initdata = {  /* PIIX PIRQC[A:D] irq mappings */
  56                0,  0,  0,  3,
  57                4,  5,  6,  7,
  58                0,  9, 10, 11,
  59                12, 0, 14, 15
  60        };
  61        int i;
  62
  63        /* Interrogate PIIX4 to get PCI IRQ mapping */
  64        for (i = 0; i <= 3; i++) {
  65                pci_read_config_byte(pdev, 0x60+i, &reg_val);
  66                if (reg_val & 0x80)
  67                        pci_irq[PCIA+i] = 0;    /* Disabled */
  68                else
  69                        pci_irq[PCIA+i] = piixirqmap[reg_val & 15];
  70        }
  71
  72        /* Done by YAMON 2.00 onwards */
  73        if (PCI_SLOT(pdev->devfn) == 10) {
  74                /*
  75                 * Set top of main memory accessible by ISA or DMA
  76                 * devices to 16 Mb.
  77                 */
  78                pci_read_config_byte(pdev, 0x69, &reg_val);
  79                pci_write_config_byte(pdev, 0x69, reg_val | 0xf0);
  80        }
  81}
  82
  83DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0,
  84         malta_piix_func0_fixup);
  85
  86static void __init malta_piix_func1_fixup(struct pci_dev *pdev)
  87{
  88        unsigned char reg_val;
  89
  90        /* Done by YAMON 2.02 onwards */
  91        if (PCI_SLOT(pdev->devfn) == 10) {
  92                /*
  93                 * IDE Decode enable.
  94                 */
  95                pci_read_config_byte(pdev, 0x41, &reg_val);
  96                pci_write_config_byte(pdev, 0x41, reg_val|0x80);
  97                pci_read_config_byte(pdev, 0x43, &reg_val);
  98                pci_write_config_byte(pdev, 0x43, reg_val|0x80);
  99        }
 100}
 101
 102DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB,
 103         malta_piix_func1_fixup);
 104