arch/mips/pci/fixup-malta.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/init.h>
   3 #include <linux/pci.h>
   4 #include <asm/mips-boards/piix4.h>
   5
   6 /* PCI interrupt pins */
   7 #define PCIA            1
   8 #define PCIB            2
   9 #define PCIC            3
  10 #define PCID            4
  11
  12 /* This table is filled in by interrogating the PIIX4 chip */
  13 static char pci_irq[5] = {
  14 };
  15
  16 static char irq_tab[][5] = {
  17         /*      INTA    INTB    INTC    INTD */
  18         {0,     0,      0,      0,      0 },    /*  0: GT64120 PCI bridge */
  19         {0,     0,      0,      0,      0 },    /*  1: Unused */
  20         {0,     0,      0,      0,      0 },    /*  2: Unused */
  21         {0,     0,      0,      0,      0 },    /*  3: Unused */
  22         {0,     0,      0,      0,      0 },    /*  4: Unused */
  23         {0,     0,      0,      0,      0 },    /*  5: Unused */
  24         {0,     0,      0,      0,      0 },    /*  6: Unused */
  25         {0,     0,      0,      0,      0 },    /*  7: Unused */
  26         {0,     0,      0,      0,      0 },    /*  8: Unused */
  27         {0,     0,      0,      0,      0 },    /*  9: Unused */
  28         {0,     0,      0,      0,      PCID }, /* 10: PIIX4 USB */
  29         {0,     PCIB,   0,      0,      0 },    /* 11: AMD 79C973 Ethernet */
  30         {0,     PCIC,   0,      0,      0 },    /* 12: Crystal 4281 Sound */
  31         {0,     0,      0,      0,      0 },    /* 13: Unused */
  32         {0,     0,      0,      0,      0 },    /* 14: Unused */
  33         {0,     0,      0,      0,      0 },    /* 15: Unused */
  34         {0,     0,      0,      0,      0 },    /* 16: Unused */
  35         {0,     0,      0,      0,      0 },    /* 17: Bonito/SOC-it PCI Bridge*/
  36         {0,     PCIA,   PCIB,   PCIC,   PCID }, /* 18: PCI Slot 1 */
  37         {0,     PCIB,   PCIC,   PCID,   PCIA }, /* 19: PCI Slot 2 */
  38         {0,     PCIC,   PCID,   PCIA,   PCIB }, /* 20: PCI Slot 3 */
  39         {0,     PCID,   PCIA,   PCIB,   PCIC }  /* 21: PCI Slot 4 */
  40 };
  41
  42 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  43 {
  44         int virq;
  45         virq = irq_tab[slot][pin];
  46         return pci_irq[virq];
  47 }
  48
  49 /* Do platform specific device initialization at pci_enable_device() time */
  50 int pcibios_plat_dev_init(struct pci_dev *dev)
  51 {
  52         return 0;
  53 }
  54
  55 static void malta_piix_func3_base_fixup(struct pci_dev *dev)
  56 {
  57         /* Set a sane PM I/O base address */
  58         pci_write_config_word(dev, PIIX4_FUNC3_PMBA, 0x1000);
  59
  60         /* Enable access to the PM I/O region */
  61         pci_write_config_byte(dev, PIIX4_FUNC3_PMREGMISC,
  62                               PIIX4_FUNC3_PMREGMISC_EN);
  63 }
  64
  65 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3,
  66                         malta_piix_func3_base_fixup);
  67
  68 static void malta_piix_func0_fixup(struct pci_dev *pdev)
  69 {
  70         unsigned char reg_val;
  71         u32 reg_val32;
  72         u16 reg_val16;
  73         /* PIIX PIRQC[A:D] irq mappings */
  74         static int piixirqmap[PIIX4_FUNC0_PIRQRC_IRQ_ROUTING_MAX] = {
  75                 0,  0,  0,  3,
  76                 4,  5,  6,  7,
  77                 0,  9, 10, 11,
  78                 12, 0, 14, 15
  79         };
  80         int i;
  81
  82         /* Interrogate PIIX4 to get PCI IRQ mapping */
  83         for (i = 0; i <= 3; i++) {
  84                 pci_read_config_byte(pdev, PIIX4_FUNC0_PIRQRC+i, &reg_val);
  85                 if (reg_val & PIIX4_FUNC0_PIRQRC_IRQ_ROUTING_DISABLE)
  86                         pci_irq[PCIA+i] = 0;    /* Disabled */
  87                 else
  88                         pci_irq[PCIA+i] = piixirqmap[reg_val &
  89                                 PIIX4_FUNC0_PIRQRC_IRQ_ROUTING_MASK];
  90         }
  91
  92         /* Done by YAMON 2.00 onwards */
  93         if (PCI_SLOT(pdev->devfn) == 10) {
  94                 /*
  95                  * Set top of main memory accessible by ISA or DMA
  96                  * devices to 16 Mb.
  97                  */
  98                 pci_read_config_byte(pdev, PIIX4_FUNC0_TOM, &reg_val);
  99                 pci_write_config_byte(pdev, PIIX4_FUNC0_TOM, reg_val |
 100                                 PIIX4_FUNC0_TOM_TOP_OF_MEMORY_MASK);
 101         }
 102
 103         /* Mux SERIRQ to its pin */
 104         pci_read_config_dword(pdev, PIIX4_FUNC0_GENCFG, &reg_val32);
 105         pci_write_config_dword(pdev, PIIX4_FUNC0_GENCFG,
 106                                reg_val32 | PIIX4_FUNC0_GENCFG_SERIRQ);
 107
 108         /* Enable SERIRQ */
 109         pci_read_config_byte(pdev, PIIX4_FUNC0_SERIRQC, &reg_val);
 110         reg_val |= PIIX4_FUNC0_SERIRQC_EN | PIIX4_FUNC0_SERIRQC_CONT;
 111         pci_write_config_byte(pdev, PIIX4_FUNC0_SERIRQC, reg_val);
 112
 113         /* Enable response to special cycles */
 114         pci_read_config_word(pdev, PCI_COMMAND, &reg_val16);
 115         pci_write_config_word(pdev, PCI_COMMAND,
 116                               reg_val16 | PCI_COMMAND_SPECIAL);
 117 }
 118
 119 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0,
 120          malta_piix_func0_fixup);
 121
 122 static void malta_piix_func1_fixup(struct pci_dev *pdev)
 123 {
 124         unsigned char reg_val;
 125
 126         /* Done by YAMON 2.02 onwards */
 127         if (PCI_SLOT(pdev->devfn) == 10) {
 128                 /*
 129                  * IDE Decode enable.
 130                  */
 131                 pci_read_config_byte(pdev, PIIX4_FUNC1_IDETIM_PRIMARY_HI,
 132                         &reg_val);
 133                 pci_write_config_byte(pdev, PIIX4_FUNC1_IDETIM_PRIMARY_HI,
 134                         reg_val|PIIX4_FUNC1_IDETIM_PRIMARY_HI_IDE_DECODE_EN);
 135                 pci_read_config_byte(pdev, PIIX4_FUNC1_IDETIM_SECONDARY_HI,
 136                         &reg_val);
 137                 pci_write_config_byte(pdev, PIIX4_FUNC1_IDETIM_SECONDARY_HI,
 138                         reg_val|PIIX4_FUNC1_IDETIM_SECONDARY_HI_IDE_DECODE_EN);
 139         }
 140 }
 141
 142 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB,
 143          malta_piix_func1_fixup);
 144
 145 /* Enable PCI 2.1 compatibility in PIIX4 */
 146 static void quirk_dlcsetup(struct pci_dev *dev)
 147 {
 148         u8 odlc, ndlc;
 149
 150         (void) pci_read_config_byte(dev, PIIX4_FUNC0_DLC, &odlc);
 151         /* Enable passive releases and delayed transaction */
 152         ndlc = odlc | PIIX4_FUNC0_DLC_USBPR_EN |
 153                       PIIX4_FUNC0_DLC_PASSIVE_RELEASE_EN |
 154                       PIIX4_FUNC0_DLC_DELAYED_TRANSACTION_EN;
 155         (void) pci_write_config_byte(dev, PIIX4_FUNC0_DLC, ndlc);
 156 }
 157
 158 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0,
 159         quirk_dlcsetup);