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Linux/arch/m68k/sun3x/prom.c

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  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 
 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                 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         /* 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 

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