1/* 2 * linux/arch/alpha/kernel/sys_jensen.c 3 * 4 * Copyright (C) 1995 Linus Torvalds 5 * Copyright (C) 1998, 1999 Richard Henderson 6 * 7 * Code supporting the Jensen. 8 */ 9 10#include <linux/kernel.h> 11#include <linux/types.h> 12#include <linux/mm.h> 13#include <linux/sched.h> 14#include <linux/pci.h> 15#include <linux/init.h> 16 17#include <asm/ptrace.h> 18#include <asm/system.h> 19 20#define __EXTERN_INLINE inline 21#include <asm/io.h> 22#include <asm/jensen.h> 23#undef __EXTERN_INLINE 24 25#include <asm/dma.h> 26#include <asm/irq.h> 27#include <asm/mmu_context.h> 28#include <asm/pgtable.h> 29#include <asm/tlbflush.h> 30 31#include "proto.h" 32#include "irq_impl.h" 33#include "pci_impl.h" 34#include "machvec_impl.h" 35 36 37/* 38 * Jensen is special: the vector is 0x8X0 for EISA interrupt X, and 39 * 0x9X0 for the local motherboard interrupts. 40 * 41 * Note especially that those local interrupts CANNOT be masked, 42 * which causes much of the pain below... 43 * 44 * 0x660 - NMI 45 * 46 * 0x800 - IRQ0 interval timer (not used, as we use the RTC timer) 47 * 0x810 - IRQ1 line printer (duh..) 48 * 0x860 - IRQ6 floppy disk 49 * 50 * 0x900 - COM1 51 * 0x920 - COM2 52 * 0x980 - keyboard 53 * 0x990 - mouse 54 * 55 * PCI-based systems are more sane: they don't have the local 56 * interrupts at all, and have only normal PCI interrupts from 57 * devices. Happily it's easy enough to do a sane mapping from the 58 * Jensen. 59 * 60 * Note that this means that we may have to do a hardware 61 * "local_op" to a different interrupt than we report to the rest of the 62 * world. 63 */ 64 65static unsigned int 66jensen_local_startup(unsigned int irq) 67{ 68 /* the parport is really hw IRQ 1, silly Jensen. */ 69 if (irq == 7) 70 i8259a_startup_irq(1); 71 else 72 /* 73 * For all true local interrupts, set the flag that prevents 74 * the IPL from being dropped during handler processing. 75 */ 76 if (irq_desc[irq].action) 77 irq_desc[irq].action->flags |= IRQF_DISABLED; 78 return 0; 79} 80 81static void 82jensen_local_shutdown(unsigned int irq) 83{ 84 /* the parport is really hw IRQ 1, silly Jensen. */ 85 if (irq == 7) 86 i8259a_disable_irq(1); 87} 88 89static void 90jensen_local_enable(unsigned int irq) 91{ 92 /* the parport is really hw IRQ 1, silly Jensen. */ 93 if (irq == 7) 94 i8259a_enable_irq(1); 95} 96 97static void 98jensen_local_disable(unsigned int irq) 99{ 100 /* the parport is really hw IRQ 1, silly Jensen. */ 101 if (irq == 7) 102 i8259a_disable_irq(1); 103} 104 105static void 106jensen_local_ack(unsigned int irq) 107{ 108 /* the parport is really hw IRQ 1, silly Jensen. */ 109 if (irq == 7) 110 i8259a_mask_and_ack_irq(1); 111} 112 113static void 114jensen_local_end(unsigned int irq) 115{ 116 /* the parport is really hw IRQ 1, silly Jensen. */ 117 if (irq == 7) 118 i8259a_end_irq(1); 119} 120 121static struct hw_interrupt_type jensen_local_irq_type = { 122 .typename = "LOCAL", 123 .startup = jensen_local_startup, 124 .shutdown = jensen_local_shutdown, 125 .enable = jensen_local_enable, 126 .disable = jensen_local_disable, 127 .ack = jensen_local_ack, 128 .end = jensen_local_end, 129}; 130 131static void 132jensen_device_interrupt(unsigned long vector) 133{ 134 int irq; 135 136 switch (vector) { 137 case 0x660: 138 printk("Whee.. NMI received. Probable hardware error\n"); 139 printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461)); 140 return; 141 142 /* local device interrupts: */ 143 case 0x900: irq = 4; break; /* com1 -> irq 4 */ 144 case 0x920: irq = 3; break; /* com2 -> irq 3 */ 145 case 0x980: irq = 1; break; /* kbd -> irq 1 */ 146 case 0x990: irq = 9; break; /* mouse -> irq 9 */ 147 148 default: 149 if (vector > 0x900) { 150 printk("Unknown local interrupt %lx\n", vector); 151 return; 152 } 153 154 irq = (vector - 0x800) >> 4; 155 if (irq == 1) 156 irq = 7; 157 break; 158 } 159 160 /* If there is no handler yet... */ 161 if (irq_desc[irq].action == NULL) { 162 /* If it is a local interrupt that cannot be masked... */ 163 if (vector >= 0x900) 164 { 165 /* Clear keyboard/mouse state */ 166 inb(0x64); 167 inb(0x60); 168 /* Reset serial ports */ 169 inb(0x3fa); 170 inb(0x2fa); 171 outb(0x0c, 0x3fc); 172 outb(0x0c, 0x2fc); 173 /* Clear NMI */ 174 outb(0,0x61); 175 outb(0,0x461); 176 } 177 } 178 179 180 handle_irq(irq); 181} 182 183static void __init 184jensen_init_irq(void) 185{ 186 init_i8259a_irqs(); 187 188 irq_desc[1].chip = &jensen_local_irq_type; 189 irq_desc[4].chip = &jensen_local_irq_type; 190 irq_desc[3].chip = &jensen_local_irq_type; 191 irq_desc[7].chip = &jensen_local_irq_type; 192 irq_desc[9].chip = &jensen_local_irq_type; 193 194 common_init_isa_dma(); 195} 196 197static void __init 198jensen_init_arch(void) 199{ 200 struct pci_controller *hose; 201#ifdef CONFIG_PCI 202 static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, }; 203 204 isa_bridge = &fake_isa_bridge; 205#endif 206 207 /* Create a hose so that we can report i/o base addresses to 208 userland. */ 209 210 pci_isa_hose = hose = alloc_pci_controller(); 211 hose->io_space = &ioport_resource; 212 hose->mem_space = &iomem_resource; 213 hose->index = 0; 214 215 hose->sparse_mem_base = EISA_MEM - IDENT_ADDR; 216 hose->dense_mem_base = 0; 217 hose->sparse_io_base = EISA_IO - IDENT_ADDR; 218 hose->dense_io_base = 0; 219 220 hose->sg_isa = hose->sg_pci = NULL; 221 __direct_map_base = 0; 222 __direct_map_size = 0xffffffff; 223} 224 225static void 226jensen_machine_check (u64 vector, u64 la) 227{ 228 printk(KERN_CRIT "Machine check\n"); 229} 230 231 232/* 233 * The System Vector 234 */ 235 236struct alpha_machine_vector jensen_mv __initmv = { 237 .vector_name = "Jensen", 238 DO_EV4_MMU, 239 IO_LITE(JENSEN,jensen), 240 .machine_check = jensen_machine_check, 241 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, 242 .rtc_port = 0x170, 243 244 .nr_irqs = 16, 245 .device_interrupt = jensen_device_interrupt, 246 247 .init_arch = jensen_init_arch, 248 .init_irq = jensen_init_irq, 249 .init_rtc = common_init_rtc, 250 .init_pci = NULL, 251 .kill_arch = NULL, 252}; 253ALIAS_MV(jensen) 254