1 /* 2 * ranges.c: Handle ranges in newer proms for obio/sbus. 3 * 4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 5 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 6 */ 7 8 #include <linux/init.h> 9 #include <asm/openprom.h> 10 #include <asm/oplib.h> 11 #include <asm/types.h> 12 #include <asm/system.h> 13 14 struct linux_prom_ranges promlib_obio_ranges[PROMREG_MAX]; 15 int num_obio_ranges; 16 17 /* Adjust register values based upon the ranges parameters. */ 18 static void 19 prom_adjust_regs(struct linux_prom_registers *regp, int nregs, 20 struct linux_prom_ranges *rangep, int nranges) 21 { 22 int regc, rngc; 23 24 for (regc = 0; regc < nregs; regc++) { 25 for (rngc = 0; rngc < nranges; rngc++) 26 if (regp[regc].which_io == rangep[rngc].ot_child_space) 27 break; /* Fount it */ 28 if (rngc == nranges) /* oops */ 29 prom_printf("adjust_regs: Could not find range with matching bus type...\n"); 30 regp[regc].which_io = rangep[rngc].ot_parent_space; 31 regp[regc].phys_addr -= rangep[rngc].ot_child_base; 32 regp[regc].phys_addr += rangep[rngc].ot_parent_base; 33 } 34 } 35 36 void 37 prom_adjust_ranges(struct linux_prom_ranges *ranges1, int nranges1, 38 struct linux_prom_ranges *ranges2, int nranges2) 39 { 40 int rng1c, rng2c; 41 42 for(rng1c=0; rng1c < nranges1; rng1c++) { 43 for(rng2c=0; rng2c < nranges2; rng2c++) 44 if(ranges1[rng1c].ot_parent_space == ranges2[rng2c].ot_child_space && 45 ranges1[rng1c].ot_parent_base >= ranges2[rng2c].ot_child_base && 46 ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base > 0U) 47 break; 48 if(rng2c == nranges2) /* oops */ 49 prom_printf("adjust_ranges: Could not find matching bus type...\n"); 50 else if (ranges1[rng1c].ot_parent_base + ranges1[rng1c].or_size > ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size) 51 ranges1[rng1c].or_size = 52 ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base; 53 ranges1[rng1c].ot_parent_space = ranges2[rng2c].ot_parent_space; 54 ranges1[rng1c].ot_parent_base += ranges2[rng2c].ot_parent_base; 55 } 56 } 57 58 /* Apply probed obio ranges to registers passed, if no ranges return. */ 59 void 60 prom_apply_obio_ranges(struct linux_prom_registers *regs, int nregs) 61 { 62 if(num_obio_ranges) 63 prom_adjust_regs(regs, nregs, promlib_obio_ranges, num_obio_ranges); 64 } 65 66 void __init prom_ranges_init(void) 67 { 68 int node, obio_node; 69 int success; 70 71 num_obio_ranges = 0; 72 73 /* Check for obio and sbus ranges. */ 74 node = prom_getchild(prom_root_node); 75 obio_node = prom_searchsiblings(node, "obio"); 76 77 if(obio_node) { 78 success = prom_getproperty(obio_node, "ranges", 79 (char *) promlib_obio_ranges, 80 sizeof(promlib_obio_ranges)); 81 if(success != -1) 82 num_obio_ranges = (success/sizeof(struct linux_prom_ranges)); 83 } 84 85 if(num_obio_ranges) 86 prom_printf("PROMLIB: obio_ranges %d\n", num_obio_ranges); 87 88 return; 89 } 90 91 void 92 prom_apply_generic_ranges (int node, int parent, struct linux_prom_registers *regs, int nregs) 93 { 94 int success; 95 int num_ranges; 96 struct linux_prom_ranges ranges[PROMREG_MAX]; 97 98 success = prom_getproperty(node, "ranges", 99 (char *) ranges, 100 sizeof (ranges)); 101 if (success != -1) { 102 num_ranges = (success/sizeof(struct linux_prom_ranges)); 103 if (parent) { 104 struct linux_prom_ranges parent_ranges[PROMREG_MAX]; 105 int num_parent_ranges; 106 107 success = prom_getproperty(parent, "ranges", 108 (char *) parent_ranges, 109 sizeof (parent_ranges)); 110 if (success != -1) { 111 num_parent_ranges = (success/sizeof(struct linux_prom_ranges)); 112 prom_adjust_ranges (ranges, num_ranges, parent_ranges, num_parent_ranges); 113 } 114 } 115 prom_adjust_regs(regs, nregs, ranges, num_ranges); 116 } 117 } 118