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165 lines
3.6 KiB
165 lines
3.6 KiB
// 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/segment.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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