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 */
  11 static char pci_irq[5] __initdata;
  12
  13 static 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
  39 int __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 */
  47 int pcibios_plat_dev_init(struct pci_dev *dev)
  48 {
  49         return 0;
  50 }
  51
  52 static 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
  83 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0,
  84          malta_piix_func0_fixup);
  85
  86 static 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
 102 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB,
 103          malta_piix_func1_fixup);