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 15 static struct linux_prom_ranges promlib_obio_ranges[PROMREG_MAX]; 16 static int num_obio_ranges; 17 18 /* Adjust register values based upon the ranges parameters. */ 19 static void 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 static void prom_adjust_ranges(struct linux_prom_ranges *ranges1, int nranges1, 37 struct linux_prom_ranges *ranges2, int nranges2) 38 { 39 int rng1c, rng2c; 40 41 for (rng1c = 0; rng1c < nranges1; rng1c++) { 42 for (rng2c = 0; rng2c < nranges2; rng2c++) 43 if (ranges1[rng1c].ot_parent_space == ranges2[rng2c].ot_child_space && 44 ranges1[rng1c].ot_parent_base >= ranges2[rng2c].ot_child_base && 45 ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base > 0U) 46 break; 47 if (rng2c == nranges2) /* oops */ 48 prom_printf("adjust_ranges: Could not find matching bus type...\n"); 49 else if (ranges1[rng1c].ot_parent_base + ranges1[rng1c].or_size > ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size) 50 ranges1[rng1c].or_size = ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base; 51 ranges1[rng1c].ot_parent_space = ranges2[rng2c].ot_parent_space; 52 ranges1[rng1c].ot_parent_base += ranges2[rng2c].ot_parent_base; 53 } 54 } 55 56 /* Apply probed obio ranges to registers passed, if no ranges return. */ 57 void prom_apply_obio_ranges(struct linux_prom_registers *regs, int nregs) 58 { 59 if (num_obio_ranges) 60 prom_adjust_regs(regs, nregs, promlib_obio_ranges, num_obio_ranges); 61 } 62 EXPORT_SYMBOL(prom_apply_obio_ranges); 63 64 void __init prom_ranges_init(void) 65 { 66 phandle node, obio_node; 67 int success; 68 69 num_obio_ranges = 0; 70 71 /* Check for obio and sbus ranges. */ 72 node = prom_getchild(prom_root_node); 73 obio_node = prom_searchsiblings(node, "obio"); 74 75 if (obio_node) { 76 success = prom_getproperty(obio_node, "ranges", 77 (char *) promlib_obio_ranges, 78 sizeof(promlib_obio_ranges)); 79 if (success != -1) 80 num_obio_ranges = (success / sizeof(struct linux_prom_ranges)); 81 } 82 83 if (num_obio_ranges) 84 prom_printf("PROMLIB: obio_ranges %d\n", num_obio_ranges); 85 } 86 87 void prom_apply_generic_ranges(phandle node, phandle parent, 88 struct linux_prom_registers *regs, int nregs) 89 { 90 int success; 91 int num_ranges; 92 struct linux_prom_ranges ranges[PROMREG_MAX]; 93 94 success = prom_getproperty(node, "ranges", 95 (char *) ranges, 96 sizeof(ranges)); 97 if (success != -1) { 98 num_ranges = (success / sizeof(struct linux_prom_ranges)); 99 if (parent) { 100 struct linux_prom_ranges parent_ranges[PROMREG_MAX]; 101 int num_parent_ranges; 102 103 success = prom_getproperty(parent, "ranges", 104 (char *) parent_ranges, 105 sizeof(parent_ranges)); 106 if (success != -1) { 107 num_parent_ranges = (success / sizeof(struct linux_prom_ranges)); 108 prom_adjust_ranges(ranges, num_ranges, parent_ranges, num_parent_ranges); 109 } 110 } 111 prom_adjust_regs(regs, nregs, ranges, num_ranges); 112 } 113 } 114