1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * SNI specific PCI support for RM200/RM300. 7 * 8 * Copyright (C) 1997 - 2000, 2003, 04 Ralf Baechle (ralf@linux-mips.org) 9 */ 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <linux/pci.h> 13 14 #include <asm/mipsregs.h> 15 #include <asm/sni.h> 16 17 #include <irq.h> 18 19 /* 20 * PCIMT Shortcuts ... 21 */ 22 #define SCSI PCIMT_IRQ_SCSI 23 #define ETH PCIMT_IRQ_ETHERNET 24 #define INTA PCIMT_IRQ_INTA 25 #define INTB PCIMT_IRQ_INTB 26 #define INTC PCIMT_IRQ_INTC 27 #define INTD PCIMT_IRQ_INTD 28 29 /* 30 * Device 0: PCI EISA Bridge (directly routed) 31 * Device 1: NCR53c810 SCSI (directly routed) 32 * Device 2: PCnet32 Ethernet (directly routed) 33 * Device 3: VGA (routed to INTB) 34 * Device 4: Unused 35 * Device 5: Slot 2 36 * Device 6: Slot 3 37 * Device 7: Slot 4 38 * 39 * Documentation says the VGA is device 5 and device 3 is unused but that 40 * seem to be a documentation error. At least on my RM200C the Cirrus 41 * Logic CL-GD5434 VGA is device 3. 42 */ 43 static char irq_tab_rm200[8][5] = { 44 /* INTA INTB INTC INTD */ 45 { 0, 0, 0, 0, 0 }, /* EISA bridge */ 46 { SCSI, SCSI, SCSI, SCSI, SCSI }, /* SCSI */ 47 { ETH, ETH, ETH, ETH, ETH }, /* Ethernet */ 48 { INTB, INTB, INTB, INTB, INTB }, /* VGA */ 49 { 0, 0, 0, 0, 0 }, /* Unused */ 50 { 0, INTB, INTC, INTD, INTA }, /* Slot 2 */ 51 { 0, INTC, INTD, INTA, INTB }, /* Slot 3 */ 52 { 0, INTD, INTA, INTB, INTC }, /* Slot 4 */ 53 }; 54 55 /* 56 * In Revision D of the RM300 Device 2 has become a normal purpose Slot 1 57 * 58 * The VGA card is optional for RM300 systems. 59 */ 60 static char irq_tab_rm300d[8][5] = { 61 /* INTA INTB INTC INTD */ 62 { 0, 0, 0, 0, 0 }, /* EISA bridge */ 63 { SCSI, SCSI, SCSI, SCSI, SCSI }, /* SCSI */ 64 { 0, INTC, INTD, INTA, INTB }, /* Slot 1 */ 65 { INTB, INTB, INTB, INTB, INTB }, /* VGA */ 66 { 0, 0, 0, 0, 0 }, /* Unused */ 67 { 0, INTB, INTC, INTD, INTA }, /* Slot 2 */ 68 { 0, INTC, INTD, INTA, INTB }, /* Slot 3 */ 69 { 0, INTD, INTA, INTB, INTC }, /* Slot 4 */ 70 }; 71 72 static char irq_tab_rm300e[5][5] = { 73 /* INTA INTB INTC INTD */ 74 { 0, 0, 0, 0, 0 }, /* HOST bridge */ 75 { SCSI, SCSI, SCSI, SCSI, SCSI }, /* SCSI */ 76 { 0, INTC, INTD, INTA, INTB }, /* Bridge/i960 */ 77 { 0, INTD, INTA, INTB, INTC }, /* Slot 1 */ 78 { 0, INTA, INTB, INTC, INTD }, /* Slot 2 */ 79 }; 80 #undef SCSI 81 #undef ETH 82 #undef INTA 83 #undef INTB 84 #undef INTC 85 #undef INTD 86 87 88 /* 89 * PCIT Shortcuts ... 90 */ 91 #define SCSI0 PCIT_IRQ_SCSI0 92 #define SCSI1 PCIT_IRQ_SCSI1 93 #define ETH PCIT_IRQ_ETHERNET 94 #define INTA PCIT_IRQ_INTA 95 #define INTB PCIT_IRQ_INTB 96 #define INTC PCIT_IRQ_INTC 97 #define INTD PCIT_IRQ_INTD 98 99 static char irq_tab_pcit[13][5] = { 100 /* INTA INTB INTC INTD */ 101 { 0, 0, 0, 0, 0 }, /* HOST bridge */ 102 { SCSI0, SCSI0, SCSI0, SCSI0, SCSI0 }, /* SCSI */ 103 { SCSI1, SCSI1, SCSI1, SCSI1, SCSI1 }, /* SCSI */ 104 { ETH, ETH, ETH, ETH, ETH }, /* Ethernet */ 105 { 0, INTA, INTB, INTC, INTD }, /* PCI-PCI bridge */ 106 { 0, 0, 0, 0, 0 }, /* Unused */ 107 { 0, 0, 0, 0, 0 }, /* Unused */ 108 { 0, 0, 0, 0, 0 }, /* Unused */ 109 { 0, INTA, INTB, INTC, INTD }, /* Slot 1 */ 110 { 0, INTB, INTC, INTD, INTA }, /* Slot 2 */ 111 { 0, INTC, INTD, INTA, INTB }, /* Slot 3 */ 112 { 0, INTD, INTA, INTB, INTC }, /* Slot 4 */ 113 { 0, INTA, INTB, INTC, INTD }, /* Slot 5 */ 114 }; 115 116 static char irq_tab_pcit_cplus[13][5] = { 117 /* INTA INTB INTC INTD */ 118 { 0, 0, 0, 0, 0 }, /* HOST bridge */ 119 { 0, INTB, INTC, INTD, INTA }, /* PCI Slot 9 */ 120 { 0, 0, 0, 0, 0 }, /* PCI-EISA */ 121 { 0, 0, 0, 0, 0 }, /* Unused */ 122 { 0, INTA, INTB, INTC, INTD }, /* PCI-PCI bridge */ 123 { 0, INTB, INTC, INTD, INTA }, /* fixup */ 124 }; 125 126 static inline int is_rm300_revd(void) 127 { 128 unsigned char csmsr = *(volatile unsigned char *)PCIMT_CSMSR; 129 130 return (csmsr & 0xa0) == 0x20; 131 } 132 133 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) 134 { 135 switch (sni_brd_type) { 136 case SNI_BRD_PCI_TOWER_CPLUS: 137 if (slot == 4) { 138 /* 139 * SNI messed up interrupt wiring for onboard 140 * PCI bus 1; we need to fix this up here 141 */ 142 while (dev && dev->bus->number != 1) 143 dev = dev->bus->self; 144 if (dev && dev->devfn >= PCI_DEVFN(4, 0)) 145 slot = 5; 146 } 147 return irq_tab_pcit_cplus[slot][pin]; 148 case SNI_BRD_PCI_TOWER: 149 return irq_tab_pcit[slot][pin]; 150 151 case SNI_BRD_PCI_MTOWER: 152 if (is_rm300_revd()) 153 return irq_tab_rm300d[slot][pin]; 154 fallthrough; 155 case SNI_BRD_PCI_DESKTOP: 156 return irq_tab_rm200[slot][pin]; 157 158 case SNI_BRD_PCI_MTOWER_CPLUS: 159 return irq_tab_rm300e[slot][pin]; 160 } 161 162 return 0; 163 } 164 165 /* Do platform specific device initialization at pci_enable_device() time */ 166 int pcibios_plat_dev_init(struct pci_dev *dev) 167 { 168 return 0; 169 } 170