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 <linux/module.h> 10 11 #include <asm/openprom.h> 12 #include <asm/oplib.h> 13 #include <asm/types.h> 14 #include <asm/system.h> 15 16 struct linux_prom_ranges promlib_obio_ranges[PROMREG_MAX]; 17 int num_obio_ranges; 18 19 /* Adjust register values based upon the ranges parameters. */ 20 static void 21 prom_adjust_regs(struct linux_prom_registers *regp, int nregs, 22 struct linux_prom_ranges *rangep, int nranges) 23 { 24 int regc, rngc; 25 26 for (regc = 0; regc < nregs; regc++) { 27 for (rngc = 0; rngc < nranges; rngc++) 28 if (regp[regc].which_io == rangep[rngc].ot_child_space) 29 break; /* Fount it */ 30 if (rngc == nranges) /* oops */ 31 prom_printf("adjust_regs: Could not find range with matching bus type...\n"); 32 regp[regc].which_io = rangep[rngc].ot_parent_space; 33 regp[regc].phys_addr -= rangep[rngc].ot_child_base; 34 regp[regc].phys_addr += rangep[rngc].ot_parent_base; 35 } 36 } 37 38 void 39 prom_adjust_ranges(struct linux_prom_ranges *ranges1, int nranges1, 40 struct linux_prom_ranges *ranges2, int nranges2) 41 { 42 int rng1c, rng2c; 43 44 for(rng1c=0; rng1c < nranges1; rng1c++) { 45 for(rng2c=0; rng2c < nranges2; rng2c++) 46 if(ranges1[rng1c].ot_parent_space == ranges2[rng2c].ot_child_space && 47 ranges1[rng1c].ot_parent_base >= ranges2[rng2c].ot_child_base && 48 ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base > 0U) 49 break; 50 if(rng2c == nranges2) /* oops */ 51 prom_printf("adjust_ranges: Could not find matching bus type...\n"); 52 else if (ranges1[rng1c].ot_parent_base + ranges1[rng1c].or_size > ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size) 53 ranges1[rng1c].or_size = 54 ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base; 55 ranges1[rng1c].ot_parent_space = ranges2[rng2c].ot_parent_space; 56 ranges1[rng1c].ot_parent_base += ranges2[rng2c].ot_parent_base; 57 } 58 } 59 60 /* Apply probed obio ranges to registers passed, if no ranges return. */ 61 void 62 prom_apply_obio_ranges(struct linux_prom_registers *regs, int nregs) 63 { 64 if(num_obio_ranges) 65 prom_adjust_regs(regs, nregs, promlib_obio_ranges, num_obio_ranges); 66 } 67 EXPORT_SYMBOL(prom_apply_obio_ranges); 68 69 void __init prom_ranges_init(void) 70 { 71 int node, obio_node; 72 int success; 73 74 num_obio_ranges = 0; 75 76 /* Check for obio and sbus ranges. */ 77 node = prom_getchild(prom_root_node); 78 obio_node = prom_searchsiblings(node, "obio"); 79 80 if(obio_node) { 81 success = prom_getproperty(obio_node, "ranges", 82 (char *) promlib_obio_ranges, 83 sizeof(promlib_obio_ranges)); 84 if(success != -1) 85 num_obio_ranges = (success/sizeof(struct linux_prom_ranges)); 86 } 87 88 if(num_obio_ranges) 89 prom_printf("PROMLIB: obio_ranges %d\n", num_obio_ranges); 90 91 return; 92 } 93 94 void 95 prom_apply_generic_ranges (int node, int parent, struct linux_prom_registers *regs, int nregs) 96 { 97 int success; 98 int num_ranges; 99 struct linux_prom_ranges ranges[PROMREG_MAX]; 100 101 success = prom_getproperty(node, "ranges", 102 (char *) ranges, 103 sizeof (ranges)); 104 if (success != -1) { 105 num_ranges = (success/sizeof(struct linux_prom_ranges)); 106 if (parent) { 107 struct linux_prom_ranges parent_ranges[PROMREG_MAX]; 108 int num_parent_ranges; 109 110 success = prom_getproperty(parent, "ranges", 111 (char *) parent_ranges, 112 sizeof (parent_ranges)); 113 if (success != -1) { 114 num_parent_ranges = (success/sizeof(struct linux_prom_ranges)); 115 prom_adjust_ranges (ranges, num_ranges, parent_ranges, num_parent_ranges); 116 } 117 } 118 prom_adjust_regs(regs, nregs, ranges, num_ranges); 119 } 120 } 121