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 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 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 65 static void 66 jensen_local_enable(struct irq_data *d) 67 { 68 /* the parport is really hw IRQ 1, silly Jensen. */ 69 if (d->irq == 7) 70 i8259a_enable_irq(d); 71 } 72 73 static void 74 jensen_local_disable(struct irq_data *d) 75 { 76 /* the parport is really hw IRQ 1, silly Jensen. */ 77 if (d->irq == 7) 78 i8259a_disable_irq(d); 79 } 80 81 static void 82 jensen_local_mask_ack(struct irq_data *d) 83 { 84 /* the parport is really hw IRQ 1, silly Jensen. */ 85 if (d->irq == 7) 86 i8259a_mask_and_ack_irq(d); 87 } 88 89 static struct irq_chip jensen_local_irq_type = { 90 .name = "LOCAL", 91 .irq_unmask = jensen_local_enable, 92 .irq_mask = jensen_local_disable, 93 .irq_mask_ack = jensen_local_mask_ack, 94 }; 95 96 static void 97 jensen_device_interrupt(unsigned long vector) 98 { 99 int irq; 100 101 switch (vector) { 102 case 0x660: 103 printk("Whee.. NMI received. Probable hardware error\n"); 104 printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461)); 105 return; 106 107 /* local device interrupts: */ 108 case 0x900: irq = 4; break; /* com1 -> irq 4 */ 109 case 0x920: irq = 3; break; /* com2 -> irq 3 */ 110 case 0x980: irq = 1; break; /* kbd -> irq 1 */ 111 case 0x990: irq = 9; break; /* mouse -> irq 9 */ 112 113 default: 114 if (vector > 0x900) { 115 printk("Unknown local interrupt %lx\n", vector); 116 return; 117 } 118 119 irq = (vector - 0x800) >> 4; 120 if (irq == 1) 121 irq = 7; 122 break; 123 } 124 125 /* If there is no handler yet... */ 126 if (!irq_has_action(irq)) { 127 /* If it is a local interrupt that cannot be masked... */ 128 if (vector >= 0x900) 129 { 130 /* Clear keyboard/mouse state */ 131 inb(0x64); 132 inb(0x60); 133 /* Reset serial ports */ 134 inb(0x3fa); 135 inb(0x2fa); 136 outb(0x0c, 0x3fc); 137 outb(0x0c, 0x2fc); 138 /* Clear NMI */ 139 outb(0,0x61); 140 outb(0,0x461); 141 } 142 } 143 144 #if 0 145 /* A useful bit of code to find out if an interrupt is going wild. */ 146 { 147 static unsigned int last_msg = 0, last_cc = 0; 148 static int last_irq = -1, count = 0; 149 unsigned int cc; 150 151 __asm __volatile("rpcc %0" : "=r"(cc)); 152 ++count; 153 #define JENSEN_CYCLES_PER_SEC (150000000) 154 if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) || 155 irq != last_irq) { 156 printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n", 157 irq, count, cc-last_cc, get_irq_regs()->pc); 158 count = 0; 159 last_msg = cc; 160 last_irq = irq; 161 } 162 last_cc = cc; 163 } 164 #endif 165 166 handle_irq(irq); 167 } 168 169 static void __init 170 jensen_init_irq(void) 171 { 172 init_i8259a_irqs(); 173 174 irq_set_chip_and_handler(1, &jensen_local_irq_type, handle_level_irq); 175 irq_set_chip_and_handler(4, &jensen_local_irq_type, handle_level_irq); 176 irq_set_chip_and_handler(3, &jensen_local_irq_type, handle_level_irq); 177 irq_set_chip_and_handler(7, &jensen_local_irq_type, handle_level_irq); 178 irq_set_chip_and_handler(9, &jensen_local_irq_type, handle_level_irq); 179 180 common_init_isa_dma(); 181 } 182 183 static void __init 184 jensen_init_arch(void) 185 { 186 struct pci_controller *hose; 187 #ifdef CONFIG_PCI 188 static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, }; 189 190 isa_bridge = &fake_isa_bridge; 191 #endif 192 193 /* Create a hose so that we can report i/o base addresses to 194 userland. */ 195 196 pci_isa_hose = hose = alloc_pci_controller(); 197 hose->io_space = &ioport_resource; 198 hose->mem_space = &iomem_resource; 199 hose->index = 0; 200 201 hose->sparse_mem_base = EISA_MEM - IDENT_ADDR; 202 hose->dense_mem_base = 0; 203 hose->sparse_io_base = EISA_IO - IDENT_ADDR; 204 hose->dense_io_base = 0; 205 206 hose->sg_isa = hose->sg_pci = NULL; 207 __direct_map_base = 0; 208 __direct_map_size = 0xffffffff; 209 } 210 211 static void 212 jensen_machine_check(unsigned long vector, unsigned long la) 213 { 214 printk(KERN_CRIT "Machine check\n"); 215 } 216 217 /* 218 * The System Vector 219 */ 220 221 struct alpha_machine_vector jensen_mv __initmv = { 222 .vector_name = "Jensen", 223 DO_EV4_MMU, 224 IO_LITE(JENSEN,jensen), 225 .machine_check = jensen_machine_check, 226 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, 227 .rtc_port = 0x170, 228 229 .nr_irqs = 16, 230 .device_interrupt = jensen_device_interrupt, 231 232 .init_arch = jensen_init_arch, 233 .init_irq = jensen_init_irq, 234 .init_rtc = common_init_rtc, 235 .init_pci = NULL, 236 .kill_arch = NULL, 237 }; 238 ALIAS_MV(jensen) 239