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