Adrian Bunk | b00dc83 | 2008-05-19 16:52:27 -0700 | [diff] [blame^] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * p1275.c: Sun IEEE 1275 PROM low level interface routines |
| 3 | * |
| 4 | * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| 5 | */ |
| 6 | |
| 7 | #include <linux/kernel.h> |
| 8 | #include <linux/init.h> |
| 9 | #include <linux/sched.h> |
| 10 | #include <linux/smp.h> |
| 11 | #include <linux/string.h> |
| 12 | #include <linux/spinlock.h> |
| 13 | |
| 14 | #include <asm/openprom.h> |
| 15 | #include <asm/oplib.h> |
| 16 | #include <asm/system.h> |
| 17 | #include <asm/spitfire.h> |
| 18 | #include <asm/pstate.h> |
David S. Miller | 4f0234f | 2007-07-13 16:03:42 -0700 | [diff] [blame] | 19 | #include <asm/ldc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
| 21 | struct { |
| 22 | long prom_callback; /* 0x00 */ |
| 23 | void (*prom_cif_handler)(long *); /* 0x08 */ |
| 24 | unsigned long prom_cif_stack; /* 0x10 */ |
| 25 | unsigned long prom_args [23]; /* 0x18 */ |
| 26 | char prom_buffer [3000]; |
| 27 | } p1275buf; |
| 28 | |
| 29 | extern void prom_world(int); |
| 30 | |
| 31 | extern void prom_cif_interface(void); |
| 32 | extern void prom_cif_callback(void); |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | /* |
| 35 | * This provides SMP safety on the p1275buf. prom_callback() drops this lock |
| 36 | * to allow recursuve acquisition. |
| 37 | */ |
| 38 | DEFINE_SPINLOCK(prom_entry_lock); |
| 39 | |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 40 | long p1275_cmd(const char *service, long fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | { |
| 42 | char *p, *q; |
| 43 | unsigned long flags; |
| 44 | int nargs, nrets, i; |
| 45 | va_list list; |
| 46 | long attrs, x; |
| 47 | |
| 48 | p = p1275buf.prom_buffer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
| 50 | spin_lock_irqsave(&prom_entry_lock, flags); |
| 51 | |
| 52 | p1275buf.prom_args[0] = (unsigned long)p; /* service */ |
| 53 | strcpy (p, service); |
| 54 | p = (char *)(((long)(strchr (p, 0) + 8)) & ~7); |
| 55 | p1275buf.prom_args[1] = nargs = (fmt & 0x0f); /* nargs */ |
| 56 | p1275buf.prom_args[2] = nrets = ((fmt & 0xf0) >> 4); /* nrets */ |
| 57 | attrs = fmt >> 8; |
| 58 | va_start(list, fmt); |
| 59 | for (i = 0; i < nargs; i++, attrs >>= 3) { |
| 60 | switch (attrs & 0x7) { |
| 61 | case P1275_ARG_NUMBER: |
| 62 | p1275buf.prom_args[i + 3] = |
| 63 | (unsigned)va_arg(list, long); |
| 64 | break; |
| 65 | case P1275_ARG_IN_64B: |
| 66 | p1275buf.prom_args[i + 3] = |
| 67 | va_arg(list, unsigned long); |
| 68 | break; |
| 69 | case P1275_ARG_IN_STRING: |
| 70 | strcpy (p, va_arg(list, char *)); |
| 71 | p1275buf.prom_args[i + 3] = (unsigned long)p; |
| 72 | p = (char *)(((long)(strchr (p, 0) + 8)) & ~7); |
| 73 | break; |
| 74 | case P1275_ARG_OUT_BUF: |
| 75 | (void) va_arg(list, char *); |
| 76 | p1275buf.prom_args[i + 3] = (unsigned long)p; |
| 77 | x = va_arg(list, long); |
| 78 | i++; attrs >>= 3; |
| 79 | p = (char *)(((long)(p + (int)x + 7)) & ~7); |
| 80 | p1275buf.prom_args[i + 3] = x; |
| 81 | break; |
| 82 | case P1275_ARG_IN_BUF: |
| 83 | q = va_arg(list, char *); |
| 84 | p1275buf.prom_args[i + 3] = (unsigned long)p; |
| 85 | x = va_arg(list, long); |
| 86 | i++; attrs >>= 3; |
| 87 | memcpy (p, q, (int)x); |
| 88 | p = (char *)(((long)(p + (int)x + 7)) & ~7); |
| 89 | p1275buf.prom_args[i + 3] = x; |
| 90 | break; |
| 91 | case P1275_ARG_OUT_32B: |
| 92 | (void) va_arg(list, char *); |
| 93 | p1275buf.prom_args[i + 3] = (unsigned long)p; |
| 94 | p += 32; |
| 95 | break; |
| 96 | case P1275_ARG_IN_FUNCTION: |
| 97 | p1275buf.prom_args[i + 3] = |
| 98 | (unsigned long)prom_cif_callback; |
| 99 | p1275buf.prom_callback = va_arg(list, long); |
| 100 | break; |
| 101 | } |
| 102 | } |
| 103 | va_end(list); |
| 104 | |
| 105 | prom_world(1); |
| 106 | prom_cif_interface(); |
| 107 | prom_world(0); |
| 108 | |
| 109 | attrs = fmt >> 8; |
| 110 | va_start(list, fmt); |
| 111 | for (i = 0; i < nargs; i++, attrs >>= 3) { |
| 112 | switch (attrs & 0x7) { |
| 113 | case P1275_ARG_NUMBER: |
| 114 | (void) va_arg(list, long); |
| 115 | break; |
| 116 | case P1275_ARG_IN_STRING: |
| 117 | (void) va_arg(list, char *); |
| 118 | break; |
| 119 | case P1275_ARG_IN_FUNCTION: |
| 120 | (void) va_arg(list, long); |
| 121 | break; |
| 122 | case P1275_ARG_IN_BUF: |
| 123 | (void) va_arg(list, char *); |
| 124 | (void) va_arg(list, long); |
| 125 | i++; attrs >>= 3; |
| 126 | break; |
| 127 | case P1275_ARG_OUT_BUF: |
| 128 | p = va_arg(list, char *); |
| 129 | x = va_arg(list, long); |
| 130 | memcpy (p, (char *)(p1275buf.prom_args[i + 3]), (int)x); |
| 131 | i++; attrs >>= 3; |
| 132 | break; |
| 133 | case P1275_ARG_OUT_32B: |
| 134 | p = va_arg(list, char *); |
| 135 | memcpy (p, (char *)(p1275buf.prom_args[i + 3]), 32); |
| 136 | break; |
| 137 | } |
| 138 | } |
| 139 | va_end(list); |
| 140 | x = p1275buf.prom_args [nargs + 3]; |
| 141 | |
| 142 | spin_unlock_irqrestore(&prom_entry_lock, flags); |
| 143 | |
| 144 | return x; |
| 145 | } |
| 146 | |
| 147 | void prom_cif_init(void *cif_handler, void *cif_stack) |
| 148 | { |
| 149 | p1275buf.prom_cif_handler = (void (*)(long *))cif_handler; |
| 150 | p1275buf.prom_cif_stack = (unsigned long)cif_stack; |
| 151 | } |