arch/alpha/kernel/sys_jensen.c

   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 #include <linux/interrupt.h>
  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/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
  64 static void
  65 jensen_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
  72 static void
  73 jensen_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
  80 static void
  81 jensen_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
  88 static 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
  95 static void
  96 jensen_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
 168 static void __init
 169 jensen_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
 182 static void __init
 183 jensen_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
 210 static void
 211 jensen_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
 220 struct 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 };
 237 ALIAS_MV(jensen)