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/pgtable.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 23 void (*sun3x_putchar)(int); 24 int (*sun3x_getchar)(void); 25 int (*sun3x_mayget)(void); 26 int (*sun3x_mayput)(int); 27 void (*sun3x_prom_reboot)(void); 28 e_vector sun3x_prom_abort; 29 struct linux_romvec *romvec; 30 31 /* prom vector table */ 32 e_vector *sun3x_prom_vbr; 33 34 /* Handle returning to the prom */ 35 void 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 60 void 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 76 static 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 88 static struct console sun3x_debug = { 89 .name = "debug", 90 .write = sun3x_prom_write, 91 .flags = CON_PRINTBUFFER, 92 .index = -1, 93 }; 94 95 void __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 pr_warn("Machine reports strange type %02x\n", 111 idprom->id_machtype); 112 pr_warn("Pretending it's a 3/80, but very afraid...\n"); 113 idprom->id_machtype = SM_SUN3X | SM_3_80; 114 } 115 116 /* point trap #14 at abort. 117 * XXX this is futile since we restore the vbr first - oops 118 */ 119 vectors[VEC_TRAP14] = sun3x_prom_abort; 120 } 121 122 static int __init sun3x_debug_setup(char *arg) 123 { 124 /* If debug=prom was specified, start the debug console */ 125 if (MACH_IS_SUN3X && !strcmp(arg, "prom")) 126 register_console(&sun3x_debug); 127 return 0; 128 } 129 130 early_param("debug", sun3x_debug_setup); 131 132 /* some prom functions to export */ 133 int prom_getintdefault(int node, char *property, int deflt) 134 { 135 return deflt; 136 } 137 138 int prom_getbool (int node, char *prop) 139 { 140 return 1; 141 } 142 143 void prom_printf(char *fmt, ...) 144 { 145 } 146 147 void prom_halt (void) 148 { 149 sun3x_halt(); 150 } 151 152 /* Get the idprom and stuff it into buffer 'idbuf'. Returns the 153 * format type. 'num_bytes' is the number of bytes that your idbuf 154 * has space for. Returns 0xff on error. 155 */ 156 unsigned char 157 prom_get_idprom(char *idbuf, int num_bytes) 158 { 159 int i; 160 161 /* make a copy of the idprom structure */ 162 for (i = 0; i < num_bytes; i++) 163 idbuf[i] = ((char *)SUN3X_IDPROM)[i]; 164 165 return idbuf[0]; 166 } 167