1 /* 2 * linux/arch/alpha/kernel/sys_mikasa.c 3 * 4 * Copyright (C) 1995 David A Rusling 5 * Copyright (C) 1996 Jay A Estabrook 6 * Copyright (C) 1998, 1999 Richard Henderson 7 * 8 * Code supporting the MIKASA (AlphaServer 1000). 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/types.h> 13 #include <linux/mm.h> 14 #include <linux/sched.h> 15 #include <linux/pci.h> 16 #include <linux/init.h> 17 #include <linux/bitops.h> 18 19 #include <asm/ptrace.h> 20 #include <asm/system.h> 21 #include <asm/dma.h> 22 #include <asm/irq.h> 23 #include <asm/mmu_context.h> 24 #include <asm/io.h> 25 #include <asm/pgtable.h> 26 #include <asm/core_apecs.h> 27 #include <asm/core_cia.h> 28 #include <asm/tlbflush.h> 29 30 #include "proto.h" 31 #include "irq_impl.h" 32 #include "pci_impl.h" 33 #include "machvec_impl.h" 34 35 36 /* Note mask bit is true for ENABLED irqs. */ 37 static int cached_irq_mask; 38 39 static inline void 40 mikasa_update_irq_hw(int mask) 41 { 42 outw(mask, 0x536); 43 } 44 45 static inline void 46 mikasa_enable_irq(unsigned int irq) 47 { 48 mikasa_update_irq_hw(cached_irq_mask |= 1 << (irq - 16)); 49 } 50 51 static void 52 mikasa_disable_irq(unsigned int irq) 53 { 54 mikasa_update_irq_hw(cached_irq_mask &= ~(1 << (irq - 16))); 55 } 56 57 static unsigned int 58 mikasa_startup_irq(unsigned int irq) 59 { 60 mikasa_enable_irq(irq); 61 return 0; 62 } 63 64 static void 65 mikasa_end_irq(unsigned int irq) 66 { 67 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) 68 mikasa_enable_irq(irq); 69 } 70 71 static struct irq_chip mikasa_irq_type = { 72 .typename = "MIKASA", 73 .startup = mikasa_startup_irq, 74 .shutdown = mikasa_disable_irq, 75 .enable = mikasa_enable_irq, 76 .disable = mikasa_disable_irq, 77 .ack = mikasa_disable_irq, 78 .end = mikasa_end_irq, 79 }; 80 81 static void 82 mikasa_device_interrupt(unsigned long vector) 83 { 84 unsigned long pld; 85 unsigned int i; 86 87 /* Read the interrupt summary registers */ 88 pld = (((~inw(0x534) & 0x0000ffffUL) << 16) 89 | (((unsigned long) inb(0xa0)) << 8) 90 | inb(0x20)); 91 92 /* 93 * Now for every possible bit set, work through them and call 94 * the appropriate interrupt handler. 95 */ 96 while (pld) { 97 i = ffz(~pld); 98 pld &= pld - 1; /* clear least bit set */ 99 if (i < 16) { 100 isa_device_interrupt(vector); 101 } else { 102 handle_irq(i); 103 } 104 } 105 } 106 107 static void __init 108 mikasa_init_irq(void) 109 { 110 long i; 111 112 if (alpha_using_srm) 113 alpha_mv.device_interrupt = srm_device_interrupt; 114 115 mikasa_update_irq_hw(0); 116 117 for (i = 16; i < 32; ++i) { 118 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL; 119 irq_desc[i].chip = &mikasa_irq_type; 120 } 121 122 init_i8259a_irqs(); 123 common_init_isa_dma(); 124 } 125 126 127 /* 128 * PCI Fixup configuration. 129 * 130 * Summary @ 0x536: 131 * Bit Meaning 132 * 0 Interrupt Line A from slot 0 133 * 1 Interrupt Line B from slot 0 134 * 2 Interrupt Line C from slot 0 135 * 3 Interrupt Line D from slot 0 136 * 4 Interrupt Line A from slot 1 137 * 5 Interrupt line B from slot 1 138 * 6 Interrupt Line C from slot 1 139 * 7 Interrupt Line D from slot 1 140 * 8 Interrupt Line A from slot 2 141 * 9 Interrupt Line B from slot 2 142 *10 Interrupt Line C from slot 2 143 *11 Interrupt Line D from slot 2 144 *12 NCR 810 SCSI 145 *13 Power Supply Fail 146 *14 Temperature Warn 147 *15 Reserved 148 * 149 * The device to slot mapping looks like: 150 * 151 * Slot Device 152 * 6 NCR SCSI controller 153 * 7 Intel PCI-EISA bridge chip 154 * 11 PCI on board slot 0 155 * 12 PCI on board slot 1 156 * 13 PCI on board slot 2 157 * 158 * 159 * This two layered interrupt approach means that we allocate IRQ 16 and 160 * above for PCI interrupts. The IRQ relates to which bit the interrupt 161 * comes in on. This makes interrupt processing much easier. 162 */ 163 164 static int __init 165 mikasa_map_irq(struct pci_dev *dev, u8 slot, u8 pin) 166 { 167 static char irq_tab[8][5] __initdata = { 168 /*INT INTA INTB INTC INTD */ 169 {16+12, 16+12, 16+12, 16+12, 16+12}, /* IdSel 17, SCSI */ 170 { -1, -1, -1, -1, -1}, /* IdSel 18, PCEB */ 171 { -1, -1, -1, -1, -1}, /* IdSel 19, ???? */ 172 { -1, -1, -1, -1, -1}, /* IdSel 20, ???? */ 173 { -1, -1, -1, -1, -1}, /* IdSel 21, ???? */ 174 { 16+0, 16+0, 16+1, 16+2, 16+3}, /* IdSel 22, slot 0 */ 175 { 16+4, 16+4, 16+5, 16+6, 16+7}, /* IdSel 23, slot 1 */ 176 { 16+8, 16+8, 16+9, 16+10, 16+11}, /* IdSel 24, slot 2 */ 177 }; 178 const long min_idsel = 6, max_idsel = 13, irqs_per_slot = 5; 179 return COMMON_TABLE_LOOKUP; 180 } 181 182 183 #if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO) 184 static void 185 mikasa_apecs_machine_check(unsigned long vector, unsigned long la_ptr) 186 { 187 #define MCHK_NO_DEVSEL 0x205U 188 #define MCHK_NO_TABT 0x204U 189 190 struct el_common *mchk_header; 191 unsigned int code; 192 193 mchk_header = (struct el_common *)la_ptr; 194 195 /* Clear the error before any reporting. */ 196 mb(); 197 mb(); /* magic */ 198 draina(); 199 apecs_pci_clr_err(); 200 wrmces(0x7); 201 mb(); 202 203 code = mchk_header->code; 204 process_mcheck_info(vector, la_ptr, "MIKASA APECS", 205 (mcheck_expected(0) 206 && (code == MCHK_NO_DEVSEL 207 || code == MCHK_NO_TABT))); 208 } 209 #endif 210 211 212 /* 213 * The System Vector 214 */ 215 216 #if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO) 217 struct alpha_machine_vector mikasa_mv __initmv = { 218 .vector_name = "Mikasa", 219 DO_EV4_MMU, 220 DO_DEFAULT_RTC, 221 DO_APECS_IO, 222 .machine_check = mikasa_apecs_machine_check, 223 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, 224 .min_io_address = DEFAULT_IO_BASE, 225 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE, 226 227 .nr_irqs = 32, 228 .device_interrupt = mikasa_device_interrupt, 229 230 .init_arch = apecs_init_arch, 231 .init_irq = mikasa_init_irq, 232 .init_rtc = common_init_rtc, 233 .init_pci = common_init_pci, 234 .pci_map_irq = mikasa_map_irq, 235 .pci_swizzle = common_swizzle, 236 }; 237 ALIAS_MV(mikasa) 238 #endif 239 240 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PRIMO) 241 struct alpha_machine_vector mikasa_primo_mv __initmv = { 242 .vector_name = "Mikasa-Primo", 243 DO_EV5_MMU, 244 DO_DEFAULT_RTC, 245 DO_CIA_IO, 246 .machine_check = cia_machine_check, 247 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, 248 .min_io_address = DEFAULT_IO_BASE, 249 .min_mem_address = CIA_DEFAULT_MEM_BASE, 250 251 .nr_irqs = 32, 252 .device_interrupt = mikasa_device_interrupt, 253 254 .init_arch = cia_init_arch, 255 .init_irq = mikasa_init_irq, 256 .init_rtc = common_init_rtc, 257 .init_pci = cia_init_pci, 258 .kill_arch = cia_kill_arch, 259 .pci_map_irq = mikasa_map_irq, 260 .pci_swizzle = common_swizzle, 261 }; 262 ALIAS_MV(mikasa_primo) 263 #endif 264