165 lines
3.6 KiB
C
165 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Prom access routines for the sun3x */
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/tty.h>
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <asm/page.h>
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#include <asm/setup.h>
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#include <asm/traps.h>
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#include <asm/sun3xprom.h>
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#include <asm/idprom.h>
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#include <asm/sun3ints.h>
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#include <asm/openprom.h>
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#include <asm/machines.h>
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void (*sun3x_putchar)(int);
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int (*sun3x_getchar)(void);
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int (*sun3x_mayget)(void);
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int (*sun3x_mayput)(int);
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void (*sun3x_prom_reboot)(void);
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e_vector sun3x_prom_abort;
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struct linux_romvec *romvec;
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/* prom vector table */
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e_vector *sun3x_prom_vbr;
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/* Handle returning to the prom */
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void sun3x_halt(void)
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{
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unsigned long flags;
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/* Disable interrupts while we mess with things */
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local_irq_save(flags);
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/* Restore prom vbr */
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asm volatile ("movec %0,%%vbr" : : "r" ((void*)sun3x_prom_vbr));
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/* Restore prom NMI clock */
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// sun3x_disable_intreg(5);
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sun3_enable_irq(7);
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/* Let 'er rip */
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asm volatile ("trap #14");
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/* Restore everything */
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sun3_disable_irq(7);
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sun3_enable_irq(5);
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asm volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
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local_irq_restore(flags);
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}
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void sun3x_reboot(void)
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{
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/* This never returns, don't bother saving things */
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local_irq_disable();
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/* Restore prom vbr */
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asm volatile ("movec %0,%%vbr" : : "r" ((void*)sun3x_prom_vbr));
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/* Restore prom NMI clock */
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sun3_disable_irq(5);
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sun3_enable_irq(7);
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/* Let 'er rip */
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(*romvec->pv_reboot)("vmlinux");
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}
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static void sun3x_prom_write(struct console *co, const char *s,
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unsigned int count)
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{
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while (count--) {
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if (*s == '\n')
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sun3x_putchar('\r');
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sun3x_putchar(*s++);
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}
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}
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/* debug console - write-only */
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static struct console sun3x_debug = {
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.name = "debug",
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.write = sun3x_prom_write,
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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void __init sun3x_prom_init(void)
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{
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/* Read the vector table */
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sun3x_putchar = *(void (**)(int)) (SUN3X_P_PUTCHAR);
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sun3x_getchar = *(int (**)(void)) (SUN3X_P_GETCHAR);
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sun3x_mayget = *(int (**)(void)) (SUN3X_P_MAYGET);
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sun3x_mayput = *(int (**)(int)) (SUN3X_P_MAYPUT);
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sun3x_prom_reboot = *(void (**)(void)) (SUN3X_P_REBOOT);
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sun3x_prom_abort = *(e_vector *) (SUN3X_P_ABORT);
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romvec = (struct linux_romvec *)SUN3X_PROM_BASE;
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idprom_init();
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if (!((idprom->id_machtype & SM_ARCH_MASK) == SM_SUN3X)) {
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pr_warn("Machine reports strange type %02x\n",
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idprom->id_machtype);
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pr_warn("Pretending it's a 3/80, but very afraid...\n");
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idprom->id_machtype = SM_SUN3X | SM_3_80;
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}
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/* point trap #14 at abort.
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* XXX this is futile since we restore the vbr first - oops
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*/
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vectors[VEC_TRAP14] = sun3x_prom_abort;
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}
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static int __init sun3x_debug_setup(char *arg)
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{
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/* If debug=prom was specified, start the debug console */
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if (MACH_IS_SUN3X && !strcmp(arg, "prom"))
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register_console(&sun3x_debug);
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return 0;
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}
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early_param("debug", sun3x_debug_setup);
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/* some prom functions to export */
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int prom_getintdefault(int node, char *property, int deflt)
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{
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return deflt;
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}
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int prom_getbool (int node, char *prop)
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{
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return 1;
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}
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void prom_printf(char *fmt, ...)
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{
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}
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void prom_halt (void)
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{
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sun3x_halt();
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}
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/* Get the idprom and stuff it into buffer 'idbuf'. Returns the
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* format type. 'num_bytes' is the number of bytes that your idbuf
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* has space for. Returns 0xff on error.
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*/
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unsigned char
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prom_get_idprom(char *idbuf, int num_bytes)
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{
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int i;
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/* make a copy of the idprom structure */
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for (i = 0; i < num_bytes; i++)
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idbuf[i] = ((char *)SUN3X_IDPROM)[i];
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return idbuf[0];
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}
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