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, ®_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, ®_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, ®_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, ®_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, ®_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 ®_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 ®_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); 160