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