arch/mips/pci/fixup-malta.c

   1 #include <linux/init.h>
   2 #include <linux/pci.h>
   3 #include <asm/mips-boards/piix4.h>
   4
   5 /* PCI interrupt pins */
   6 #define PCIA            1
   7 #define PCIB            2
   8 #define PCIC            3
   9 #define PCID            4
  10
  11 /* This table is filled in by interrogating the PIIX4 chip */
  12 static char pci_irq[5] = {
  13 };
  14
  15 static char irq_tab[][5] __initdata = {
  16         /*      INTA    INTB    INTC    INTD */
  17         {0,     0,      0,      0,      0 },    /*  0: GT64120 PCI bridge */
  18         {0,     0,      0,      0,      0 },    /*  1: Unused */
  19         {0,     0,      0,      0,      0 },    /*  2: Unused */
  20         {0,     0,      0,      0,      0 },    /*  3: Unused */
  21         {0,     0,      0,      0,      0 },    /*  4: Unused */
  22         {0,     0,      0,      0,      0 },    /*  5: Unused */
  23         {0,     0,      0,      0,      0 },    /*  6: Unused */
  24         {0,     0,      0,      0,      0 },    /*  7: Unused */
  25         {0,     0,      0,      0,      0 },    /*  8: Unused */
  26         {0,     0,      0,      0,      0 },    /*  9: Unused */
  27         {0,     0,      0,      0,      PCID }, /* 10: PIIX4 USB */
  28         {0,     PCIB,   0,      0,      0 },    /* 11: AMD 79C973 Ethernet */
  29         {0,     PCIC,   0,      0,      0 },    /* 12: Crystal 4281 Sound */
  30         {0,     0,      0,      0,      0 },    /* 13: Unused */
  31         {0,     0,      0,      0,      0 },    /* 14: Unused */
  32         {0,     0,      0,      0,      0 },    /* 15: Unused */
  33         {0,     0,      0,      0,      0 },    /* 16: Unused */
  34         {0,     0,      0,      0,      0 },    /* 17: Bonito/SOC-it PCI Bridge*/
  35         {0,     PCIA,   PCIB,   PCIC,   PCID }, /* 18: PCI Slot 1 */
  36         {0,     PCIB,   PCIC,   PCID,   PCIA }, /* 19: PCI Slot 2 */
  37         {0,     PCIC,   PCID,   PCIA,   PCIB }, /* 20: PCI Slot 3 */
  38         {0,     PCID,   PCIA,   PCIB,   PCIC }  /* 21: PCI Slot 4 */
  39 };
  40
  41 int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  42 {
  43         int virq;
  44         virq = irq_tab[slot][pin];
  45         return pci_irq[virq];
  46 }
  47
  48 /* Do platform specific device initialization at pci_enable_device() time */
  49 int pcibios_plat_dev_init(struct pci_dev *dev)
  50 {
  51         return 0;
  52 }
  53
  54 static void malta_piix_func0_fixup(struct pci_dev *pdev)
  55 {
  56         unsigned char reg_val;
  57         u32 reg_val32;
  58         /* PIIX PIRQC[A:D] irq mappings */
  59         static int piixirqmap[PIIX4_FUNC0_PIRQRC_IRQ_ROUTING_MAX] = {
  60                 0,  0,  0,  3,
  61                 4,  5,  6,  7,
  62                 0,  9, 10, 11,
  63                 12, 0, 14, 15
  64         };
  65         int i;
  66
  67         /* Interrogate PIIX4 to get PCI IRQ mapping */
  68         for (i = 0; i <= 3; i++) {
  69                 pci_read_config_byte(pdev, PIIX4_FUNC0_PIRQRC+i, &reg_val);
  70                 if (reg_val & PIIX4_FUNC0_PIRQRC_IRQ_ROUTING_DISABLE)
  71                         pci_irq[PCIA+i] = 0;    /* Disabled */
  72                 else
  73                         pci_irq[PCIA+i] = piixirqmap[reg_val &
  74                                 PIIX4_FUNC0_PIRQRC_IRQ_ROUTING_MASK];
  75         }
  76
  77         /* Done by YAMON 2.00 onwards */
  78         if (PCI_SLOT(pdev->devfn) == 10) {
  79                 /*
  80                  * Set top of main memory accessible by ISA or DMA
  81                  * devices to 16 Mb.
  82                  */
  83                 pci_read_config_byte(pdev, PIIX4_FUNC0_TOM, &reg_val);
  84                 pci_write_config_byte(pdev, PIIX4_FUNC0_TOM, reg_val |
  85                                 PIIX4_FUNC0_TOM_TOP_OF_MEMORY_MASK);
  86         }
  87
  88         /* Mux SERIRQ to its pin */
  89         pci_read_config_dword(pdev, PIIX4_FUNC0_GENCFG, &reg_val32);
  90         pci_write_config_dword(pdev, PIIX4_FUNC0_GENCFG,
  91                                reg_val32 | PIIX4_FUNC0_GENCFG_SERIRQ);
  92
  93         /* Enable SERIRQ */
  94         pci_read_config_byte(pdev, PIIX4_FUNC0_SERIRQC, &reg_val);
  95         reg_val |= PIIX4_FUNC0_SERIRQC_EN | PIIX4_FUNC0_SERIRQC_CONT;
  96         pci_write_config_byte(pdev, PIIX4_FUNC0_SERIRQC, reg_val);
  97 }
  98
  99 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0,
 100          malta_piix_func0_fixup);
 101
 102 static void malta_piix_func1_fixup(struct pci_dev *pdev)
 103 {
 104         unsigned char reg_val;
 105
 106         /* Done by YAMON 2.02 onwards */
 107         if (PCI_SLOT(pdev->devfn) == 10) {
 108                 /*
 109                  * IDE Decode enable.
 110                  */
 111                 pci_read_config_byte(pdev, PIIX4_FUNC1_IDETIM_PRIMARY_HI,
 112                         &reg_val);
 113                 pci_write_config_byte(pdev, PIIX4_FUNC1_IDETIM_PRIMARY_HI,
 114                         reg_val|PIIX4_FUNC1_IDETIM_PRIMARY_HI_IDE_DECODE_EN);
 115                 pci_read_config_byte(pdev, PIIX4_FUNC1_IDETIM_SECONDARY_HI,
 116                         &reg_val);
 117                 pci_write_config_byte(pdev, PIIX4_FUNC1_IDETIM_SECONDARY_HI,
 118                         reg_val|PIIX4_FUNC1_IDETIM_SECONDARY_HI_IDE_DECODE_EN);
 119         }
 120 }
 121
 122 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB,
 123          malta_piix_func1_fixup);
 124
 125 /* Enable PCI 2.1 compatibility in PIIX4 */
 126 static void quirk_dlcsetup(struct pci_dev *dev)
 127 {
 128         u8 odlc, ndlc;
 129
 130         (void) pci_read_config_byte(dev, PIIX4_FUNC0_DLC, &odlc);
 131         /* Enable passive releases and delayed transaction */
 132         ndlc = odlc | PIIX4_FUNC0_DLC_USBPR_EN |
 133                       PIIX4_FUNC0_DLC_PASSIVE_RELEASE_EN |
 134                       PIIX4_FUNC0_DLC_DELAYED_TRANSACTION_EN;
 135         (void) pci_write_config_byte(dev, PIIX4_FUNC0_DLC, ndlc);
 136 }
 137
 138 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0,
 139         quirk_dlcsetup);