1// SPDX-License-Identifier: GPL-2.0 2/* 3 * linux/arch/alpha/kernel/sys_jensen.c 4 * 5 * Copyright (C) 1995 Linus Torvalds 6 * Copyright (C) 1998, 1999 Richard Henderson 7 * 8 * Code supporting the Jensen. 9 */ 10#define __EXTERN_INLINE 11#include <asm/io.h> 12#include <asm/jensen.h> 13#undef __EXTERN_INLINE 14 15#include <linux/interrupt.h> 16#include <linux/kernel.h> 17#include <linux/types.h> 18#include <linux/mm.h> 19#include <linux/sched.h> 20#include <linux/pci.h> 21#include <linux/init.h> 22 23#include <asm/ptrace.h> 24 25#include <asm/dma.h> 26#include <asm/irq.h> 27#include <asm/mmu_context.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/* 37 * Jensen is special: the vector is 0x8X0 for EISA interrupt X, and 38 * 0x9X0 for the local motherboard interrupts. 39 * 40 * Note especially that those local interrupts CANNOT be masked, 41 * which causes much of the pain below... 42 * 43 * 0x660 - NMI 44 * 45 * 0x800 - IRQ0 interval timer (not used, as we use the RTC timer) 46 * 0x810 - IRQ1 line printer (duh..) 47 * 0x860 - IRQ6 floppy disk 48 * 49 * 0x900 - COM1 50 * 0x920 - COM2 51 * 0x980 - keyboard 52 * 0x990 - mouse 53 * 54 * PCI-based systems are more sane: they don't have the local 55 * interrupts at all, and have only normal PCI interrupts from 56 * devices. Happily it's easy enough to do a sane mapping from the 57 * Jensen. 58 * 59 * Note that this means that we may have to do a hardware 60 * "local_op" to a different interrupt than we report to the rest of the 61 * world. 62 */ 63 64static void 65jensen_local_enable(struct irq_data *d) 66{ 67 /* the parport is really hw IRQ 1, silly Jensen. */ 68 if (d->irq == 7) 69 i8259a_enable_irq(d); 70} 71 72static void 73jensen_local_disable(struct irq_data *d) 74{ 75 /* the parport is really hw IRQ 1, silly Jensen. */ 76 if (d->irq == 7) 77 i8259a_disable_irq(d); 78} 79 80static void 81jensen_local_mask_ack(struct irq_data *d) 82{ 83 /* the parport is really hw IRQ 1, silly Jensen. */ 84 if (d->irq == 7) 85 i8259a_mask_and_ack_irq(d); 86} 87 88static struct irq_chip jensen_local_irq_type = { 89 .name = "LOCAL", 90 .irq_unmask = jensen_local_enable, 91 .irq_mask = jensen_local_disable, 92 .irq_mask_ack = jensen_local_mask_ack, 93}; 94 95static void 96jensen_device_interrupt(unsigned long vector) 97{ 98 int irq; 99 100 switch (vector) { 101 case 0x660: 102 printk("Whee.. NMI received. Probable hardware error\n"); 103 printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461)); 104 return; 105 106 /* local device interrupts: */ 107 case 0x900: irq = 4; break; /* com1 -> irq 4 */ 108 case 0x920: irq = 3; break; /* com2 -> irq 3 */ 109 case 0x980: irq = 1; break; /* kbd -> irq 1 */ 110 case 0x990: irq = 9; break; /* mouse -> irq 9 */ 111 112 default: 113 if (vector > 0x900) { 114 printk("Unknown local interrupt %lx\n", vector); 115 return; 116 } 117 118 irq = (vector - 0x800) >> 4; 119 if (irq == 1) 120 irq = 7; 121 break; 122 } 123 124 /* If there is no handler yet... */ 125 if (!irq_has_action(irq)) { 126 /* If it is a local interrupt that cannot be masked... */ 127 if (vector >= 0x900) 128 { 129 /* Clear keyboard/mouse state */ 130 inb(0x64); 131 inb(0x60); 132 /* Reset serial ports */ 133 inb(0x3fa); 134 inb(0x2fa); 135 outb(0x0c, 0x3fc); 136 outb(0x0c, 0x2fc); 137 /* Clear NMI */ 138 outb(0,0x61); 139 outb(0,0x461); 140 } 141 } 142 143#if 0 144 /* A useful bit of code to find out if an interrupt is going wild. */ 145 { 146 static unsigned int last_msg = 0, last_cc = 0; 147 static int last_irq = -1, count = 0; 148 unsigned int cc; 149 150 __asm __volatile("rpcc %0" : "=r"(cc)); 151 ++count; 152#define JENSEN_CYCLES_PER_SEC (150000000) 153 if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) || 154 irq != last_irq) { 155 printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n", 156 irq, count, cc-last_cc, get_irq_regs()->pc); 157 count = 0; 158 last_msg = cc; 159 last_irq = irq; 160 } 161 last_cc = cc; 162 } 163#endif 164 165 handle_irq(irq); 166} 167 168static void __init 169jensen_init_irq(void) 170{ 171 init_i8259a_irqs(); 172 173 irq_set_chip_and_handler(1, &jensen_local_irq_type, handle_level_irq); 174 irq_set_chip_and_handler(4, &jensen_local_irq_type, handle_level_irq); 175 irq_set_chip_and_handler(3, &jensen_local_irq_type, handle_level_irq); 176 irq_set_chip_and_handler(7, &jensen_local_irq_type, handle_level_irq); 177 irq_set_chip_and_handler(9, &jensen_local_irq_type, handle_level_irq); 178 179 common_init_isa_dma(); 180} 181 182static void __init 183jensen_init_arch(void) 184{ 185 struct pci_controller *hose; 186#ifdef CONFIG_PCI 187 static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, }; 188 189 isa_bridge = &fake_isa_bridge; 190#endif 191 192 /* Create a hose so that we can report i/o base addresses to 193 userland. */ 194 195 pci_isa_hose = hose = alloc_pci_controller(); 196 hose->io_space = &ioport_resource; 197 hose->mem_space = &iomem_resource; 198 hose->index = 0; 199 200 hose->sparse_mem_base = EISA_MEM - IDENT_ADDR; 201 hose->dense_mem_base = 0; 202 hose->sparse_io_base = EISA_IO - IDENT_ADDR; 203 hose->dense_io_base = 0; 204 205 hose->sg_isa = hose->sg_pci = NULL; 206 __direct_map_base = 0; 207 __direct_map_size = 0xffffffff; 208} 209 210static void 211jensen_machine_check(unsigned long vector, unsigned long la) 212{ 213 printk(KERN_CRIT "Machine check\n"); 214} 215 216/* 217 * The System Vector 218 */ 219 220struct alpha_machine_vector jensen_mv __initmv = { 221 .vector_name = "Jensen", 222 DO_EV4_MMU, 223 IO_LITE(JENSEN,jensen), 224 .machine_check = jensen_machine_check, 225 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, 226 .rtc_port = 0x170, 227 228 .nr_irqs = 16, 229 .device_interrupt = jensen_device_interrupt, 230 231 .init_arch = jensen_init_arch, 232 .init_irq = jensen_init_irq, 233 .init_rtc = common_init_rtc, 234 .init_pci = NULL, 235 .kill_arch = NULL, 236}; 237ALIAS_MV(jensen) 238