1 /* 2 * linux/arch/alpha/kernel/sys_takara.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 TAKARA. 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 18 #include <asm/ptrace.h> 19 #include <asm/system.h> 20 #include <asm/dma.h> 21 #include <asm/irq.h> 22 #include <asm/mmu_context.h> 23 #include <asm/io.h> 24 #include <asm/pgtable.h> 25 #include <asm/core_cia.h> 26 #include <asm/tlbflush.h> 27 28 #include "proto.h" 29 #include "irq_impl.h" 30 #include "pci_impl.h" 31 #include "machvec_impl.h" 32 #include "pc873xx.h" 33 34 /* Note mask bit is true for DISABLED irqs. */ 35 static unsigned long cached_irq_mask[2] = { -1, -1 }; 36 37 static inline void 38 takara_update_irq_hw(unsigned long irq, unsigned long mask) 39 { 40 int regaddr; 41 42 mask = (irq >= 64 ? mask << 16 : mask >> ((irq - 16) & 0x30)); 43 regaddr = 0x510 + (((irq - 16) >> 2) & 0x0c); 44 outl(mask & 0xffff0000UL, regaddr); 45 } 46 47 static inline void 48 takara_enable_irq(unsigned int irq) 49 { 50 unsigned long mask; 51 mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63))); 52 takara_update_irq_hw(irq, mask); 53 } 54 55 static void 56 takara_disable_irq(unsigned int irq) 57 { 58 unsigned long mask; 59 mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63)); 60 takara_update_irq_hw(irq, mask); 61 } 62 63 static struct irq_chip takara_irq_type = { 64 .name = "TAKARA", 65 .unmask = takara_enable_irq, 66 .mask = takara_disable_irq, 67 .mask_ack = takara_disable_irq, 68 }; 69 70 static void 71 takara_device_interrupt(unsigned long vector) 72 { 73 unsigned intstatus; 74 75 /* 76 * The PALcode will have passed us vectors 0x800 or 0x810, 77 * which are fairly arbitrary values and serve only to tell 78 * us whether an interrupt has come in on IRQ0 or IRQ1. If 79 * it's IRQ1 it's a PCI interrupt; if it's IRQ0, it's 80 * probably ISA, but PCI interrupts can come through IRQ0 81 * as well if the interrupt controller isn't in accelerated 82 * mode. 83 * 84 * OTOH, the accelerator thing doesn't seem to be working 85 * overly well, so what we'll do instead is try directly 86 * examining the Master Interrupt Register to see if it's a 87 * PCI interrupt, and if _not_ then we'll pass it on to the 88 * ISA handler. 89 */ 90 91 intstatus = inw(0x500) & 15; 92 if (intstatus) { 93 /* 94 * This is a PCI interrupt. Check each bit and 95 * despatch an interrupt if it's set. 96 */ 97 98 if (intstatus & 8) handle_irq(16+3); 99 if (intstatus & 4) handle_irq(16+2); 100 if (intstatus & 2) handle_irq(16+1); 101 if (intstatus & 1) handle_irq(16+0); 102 } else { 103 isa_device_interrupt (vector); 104 } 105 } 106 107 static void 108 takara_srm_device_interrupt(unsigned long vector) 109 { 110 int irq = (vector - 0x800) >> 4; 111 handle_irq(irq); 112 } 113 114 static void __init 115 takara_init_irq(void) 116 { 117 long i; 118 119 init_i8259a_irqs(); 120 121 if (alpha_using_srm) { 122 alpha_mv.device_interrupt = takara_srm_device_interrupt; 123 } else { 124 unsigned int ctlreg = inl(0x500); 125 126 /* Return to non-accelerated mode. */ 127 ctlreg &= ~0x8000; 128 outl(ctlreg, 0x500); 129 130 /* Enable the PCI interrupt register. */ 131 ctlreg = 0x05107c00; 132 outl(ctlreg, 0x500); 133 } 134 135 for (i = 16; i < 128; i += 16) 136 takara_update_irq_hw(i, -1); 137 138 for (i = 16; i < 128; ++i) { 139 irq_to_desc(i)->status |= IRQ_LEVEL; 140 set_irq_chip_and_handler(i, &takara_irq_type, handle_level_irq); 141 } 142 143 common_init_isa_dma(); 144 } 145 146 147 /* 148 * The Takara has PCI devices 1, 2, and 3 configured to slots 20, 149 * 19, and 18 respectively, in the default configuration. They can 150 * also be jumpered to slots 8, 7, and 6 respectively, which is fun 151 * because the SIO ISA bridge can also be slot 7. However, the SIO 152 * doesn't explicitly generate PCI-type interrupts, so we can 153 * assign it whatever the hell IRQ we like and it doesn't matter. 154 */ 155 156 static int __init 157 takara_map_irq_srm(struct pci_dev *dev, u8 slot, u8 pin) 158 { 159 static char irq_tab[15][5] __initdata = { 160 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 6 == device 3 */ 161 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 7 == device 2 */ 162 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 8 == device 1 */ 163 { -1, -1, -1, -1, -1}, /* slot 9 == nothing */ 164 { -1, -1, -1, -1, -1}, /* slot 10 == nothing */ 165 { -1, -1, -1, -1, -1}, /* slot 11 == nothing */ 166 /* These are behind the bridges. */ 167 { 12, 12, 13, 14, 15}, /* slot 12 == nothing */ 168 { 8, 8, 9, 19, 11}, /* slot 13 == nothing */ 169 { 4, 4, 5, 6, 7}, /* slot 14 == nothing */ 170 { 0, 0, 1, 2, 3}, /* slot 15 == nothing */ 171 { -1, -1, -1, -1, -1}, /* slot 16 == nothing */ 172 {64+ 0, 64+0, 64+1, 64+2, 64+3}, /* slot 17= device 4 */ 173 {48+ 0, 48+0, 48+1, 48+2, 48+3}, /* slot 18= device 3 */ 174 {32+ 0, 32+0, 32+1, 32+2, 32+3}, /* slot 19= device 2 */ 175 {16+ 0, 16+0, 16+1, 16+2, 16+3}, /* slot 20= device 1 */ 176 }; 177 const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5; 178 int irq = COMMON_TABLE_LOOKUP; 179 if (irq >= 0 && irq < 16) { 180 /* Guess that we are behind a bridge. */ 181 unsigned int busslot = PCI_SLOT(dev->bus->self->devfn); 182 irq += irq_tab[busslot-min_idsel][0]; 183 } 184 return irq; 185 } 186 187 static int __init 188 takara_map_irq(struct pci_dev *dev, u8 slot, u8 pin) 189 { 190 static char irq_tab[15][5] __initdata = { 191 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 6 == device 3 */ 192 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 7 == device 2 */ 193 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 8 == device 1 */ 194 { -1, -1, -1, -1, -1}, /* slot 9 == nothing */ 195 { -1, -1, -1, -1, -1}, /* slot 10 == nothing */ 196 { -1, -1, -1, -1, -1}, /* slot 11 == nothing */ 197 { -1, -1, -1, -1, -1}, /* slot 12 == nothing */ 198 { -1, -1, -1, -1, -1}, /* slot 13 == nothing */ 199 { -1, -1, -1, -1, -1}, /* slot 14 == nothing */ 200 { -1, -1, -1, -1, -1}, /* slot 15 == nothing */ 201 { -1, -1, -1, -1, -1}, /* slot 16 == nothing */ 202 { -1, -1, -1, -1, -1}, /* slot 17 == nothing */ 203 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 18 == device 3 */ 204 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 19 == device 2 */ 205 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 20 == device 1 */ 206 }; 207 const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5; 208 return COMMON_TABLE_LOOKUP; 209 } 210 211 static u8 __init 212 takara_swizzle(struct pci_dev *dev, u8 *pinp) 213 { 214 int slot = PCI_SLOT(dev->devfn); 215 int pin = *pinp; 216 unsigned int ctlreg = inl(0x500); 217 unsigned int busslot; 218 219 if (!dev->bus->self) 220 return slot; 221 222 busslot = PCI_SLOT(dev->bus->self->devfn); 223 /* Check for built-in bridges. */ 224 if (dev->bus->number != 0 225 && busslot > 16 226 && ((1<<(36-busslot)) & ctlreg)) { 227 if (pin == 1) 228 pin += (20 - busslot); 229 else { 230 printk(KERN_WARNING "takara_swizzle: can only " 231 "handle cards with INTA IRQ pin.\n"); 232 } 233 } else { 234 /* Must be a card-based bridge. */ 235 printk(KERN_WARNING "takara_swizzle: cannot handle " 236 "card-bridge behind builtin bridge yet.\n"); 237 } 238 239 *pinp = pin; 240 return slot; 241 } 242 243 static void __init 244 takara_init_pci(void) 245 { 246 if (alpha_using_srm) 247 alpha_mv.pci_map_irq = takara_map_irq_srm; 248 249 cia_init_pci(); 250 251 if (pc873xx_probe() == -1) { 252 printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n"); 253 } else { 254 printk(KERN_INFO "Found %s Super IO chip at 0x%x\n", 255 pc873xx_get_model(), pc873xx_get_base()); 256 pc873xx_enable_ide(); 257 } 258 } 259 260 261 /* 262 * The System Vector 263 */ 264 265 struct alpha_machine_vector takara_mv __initmv = { 266 .vector_name = "Takara", 267 DO_EV5_MMU, 268 DO_DEFAULT_RTC, 269 DO_CIA_IO, 270 .machine_check = cia_machine_check, 271 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, 272 .min_io_address = DEFAULT_IO_BASE, 273 .min_mem_address = CIA_DEFAULT_MEM_BASE, 274 275 .nr_irqs = 128, 276 .device_interrupt = takara_device_interrupt, 277 278 .init_arch = cia_init_arch, 279 .init_irq = takara_init_irq, 280 .init_rtc = common_init_rtc, 281 .init_pci = takara_init_pci, 282 .kill_arch = cia_kill_arch, 283 .pci_map_irq = takara_map_irq, 284 .pci_swizzle = takara_swizzle, 285 }; 286 ALIAS_MV(takara) 287