linux/arch/m68k/sun3x/prom.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/* Prom access routines for the sun3x */
   3
   4#include <linux/types.h>
   5#include <linux/kernel.h>
   6#include <linux/tty.h>
   7#include <linux/console.h>
   8#include <linux/init.h>
   9#include <linux/mm.h>
  10#include <linux/string.h>
  11
  12#include <asm/page.h>
  13#include <asm/setup.h>
  14#include <asm/traps.h>
  15#include <asm/sun3xprom.h>
  16#include <asm/idprom.h>
  17#include <asm/segment.h>
  18#include <asm/sun3ints.h>
  19#include <asm/openprom.h>
  20#include <asm/machines.h>
  21
  22void (*sun3x_putchar)(int);
  23int (*sun3x_getchar)(void);
  24int (*sun3x_mayget)(void);
  25int (*sun3x_mayput)(int);
  26void (*sun3x_prom_reboot)(void);
  27e_vector sun3x_prom_abort;
  28struct linux_romvec *romvec;
  29
  30/* prom vector table */
  31e_vector *sun3x_prom_vbr;
  32
  33/* Handle returning to the prom */
  34void sun3x_halt(void)
  35{
  36        unsigned long flags;
  37
  38        /* Disable interrupts while we mess with things */
  39        local_irq_save(flags);
  40
  41        /* Restore prom vbr */
  42        asm volatile ("movec %0,%%vbr" : : "r" ((void*)sun3x_prom_vbr));
  43
  44        /* Restore prom NMI clock */
  45//      sun3x_disable_intreg(5);
  46        sun3_enable_irq(7);
  47
  48        /* Let 'er rip */
  49        asm volatile ("trap #14");
  50
  51        /* Restore everything */
  52        sun3_disable_irq(7);
  53        sun3_enable_irq(5);
  54
  55        asm volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
  56        local_irq_restore(flags);
  57}
  58
  59void sun3x_reboot(void)
  60{
  61        /* This never returns, don't bother saving things */
  62        local_irq_disable();
  63
  64        /* Restore prom vbr */
  65        asm volatile ("movec %0,%%vbr" : : "r" ((void*)sun3x_prom_vbr));
  66
  67        /* Restore prom NMI clock */
  68        sun3_disable_irq(5);
  69        sun3_enable_irq(7);
  70
  71        /* Let 'er rip */
  72        (*romvec->pv_reboot)("vmlinux");
  73}
  74
  75static void sun3x_prom_write(struct console *co, const char *s,
  76                             unsigned int count)
  77{
  78        while (count--) {
  79                if (*s == '\n')
  80                        sun3x_putchar('\r');
  81                sun3x_putchar(*s++);
  82        }
  83}
  84
  85/* debug console - write-only */
  86
  87static struct console sun3x_debug = {
  88        .name   = "debug",
  89        .write  = sun3x_prom_write,
  90        .flags  = CON_PRINTBUFFER,
  91        .index  = -1,
  92};
  93
  94void __init sun3x_prom_init(void)
  95{
  96        /* Read the vector table */
  97
  98        sun3x_putchar = *(void (**)(int)) (SUN3X_P_PUTCHAR);
  99        sun3x_getchar = *(int (**)(void)) (SUN3X_P_GETCHAR);
 100        sun3x_mayget = *(int (**)(void))  (SUN3X_P_MAYGET);
 101        sun3x_mayput = *(int (**)(int))   (SUN3X_P_MAYPUT);
 102        sun3x_prom_reboot = *(void (**)(void)) (SUN3X_P_REBOOT);
 103        sun3x_prom_abort = *(e_vector *)  (SUN3X_P_ABORT);
 104        romvec = (struct linux_romvec *)SUN3X_PROM_BASE;
 105
 106        idprom_init();
 107
 108        if (!((idprom->id_machtype & SM_ARCH_MASK) == SM_SUN3X)) {
 109                pr_warn("Machine reports strange type %02x\n",
 110                        idprom->id_machtype);
 111                pr_warn("Pretending it's a 3/80, but very afraid...\n");
 112                idprom->id_machtype = SM_SUN3X | SM_3_80;
 113        }
 114
 115        /* point trap #14 at abort.
 116         * XXX this is futile since we restore the vbr first - oops
 117         */
 118        vectors[VEC_TRAP14] = sun3x_prom_abort;
 119}
 120
 121static int __init sun3x_debug_setup(char *arg)
 122{
 123        /* If debug=prom was specified, start the debug console */
 124        if (MACH_IS_SUN3X && !strcmp(arg, "prom"))
 125                register_console(&sun3x_debug);
 126        return 0;
 127}
 128
 129early_param("debug", sun3x_debug_setup);
 130
 131/* some prom functions to export */
 132int prom_getintdefault(int node, char *property, int deflt)
 133{
 134        return deflt;
 135}
 136
 137int prom_getbool (int node, char *prop)
 138{
 139        return 1;
 140}
 141
 142void prom_printf(char *fmt, ...)
 143{
 144}
 145
 146void prom_halt (void)
 147{
 148        sun3x_halt();
 149}
 150
 151/* Get the idprom and stuff it into buffer 'idbuf'.  Returns the
 152 * format type.  'num_bytes' is the number of bytes that your idbuf
 153 * has space for.  Returns 0xff on error.
 154 */
 155unsigned char
 156prom_get_idprom(char *idbuf, int num_bytes)
 157{
 158        int i;
 159
 160        /* make a copy of the idprom structure */
 161        for (i = 0; i < num_bytes; i++)
 162                idbuf[i] = ((char *)SUN3X_IDPROM)[i];
 163
 164        return idbuf[0];
 165}
 166