1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ranges.c: Handle ranges in newer proms for obio/sbus. 4 * 5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 6 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 7 */ 8 9 #include <linux/init.h> 10 #include <linux/module.h> 11 12 #include <asm/openprom.h> 13 #include <asm/oplib.h> 14 #include <asm/types.h> 15 16 static struct linux_prom_ranges promlib_obio_ranges[PROMREG_MAX]; 17 static int num_obio_ranges; 18 19 /* Adjust register values based upon the ranges parameters. */ 20 static void prom_adjust_regs(struct linux_prom_registers *regp, int nregs, 21 struct linux_prom_ranges *rangep, int nranges) 22 { 23 int regc, rngc; 24 25 for (regc = 0; regc < nregs; regc++) { 26 for (rngc = 0; rngc < nranges; rngc++) 27 if (regp[regc].which_io == rangep[rngc].ot_child_space) 28 break; /* Fount it */ 29 if (rngc == nranges) /* oops */ 30 prom_printf("adjust_regs: Could not find range with matching bus type...\n"); 31 regp[regc].which_io = rangep[rngc].ot_parent_space; 32 regp[regc].phys_addr -= rangep[rngc].ot_child_base; 33 regp[regc].phys_addr += rangep[rngc].ot_parent_base; 34 } 35 } 36 37 static void 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 = ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base; 52 ranges1[rng1c].ot_parent_space = ranges2[rng2c].ot_parent_space; 53 ranges1[rng1c].ot_parent_base += ranges2[rng2c].ot_parent_base; 54 } 55 } 56 57 /* Apply probed obio ranges to registers passed, if no ranges return. */ 58 void prom_apply_obio_ranges(struct linux_prom_registers *regs, int nregs) 59 { 60 if (num_obio_ranges) 61 prom_adjust_regs(regs, nregs, promlib_obio_ranges, num_obio_ranges); 62 } 63 EXPORT_SYMBOL(prom_apply_obio_ranges); 64 65 void __init prom_ranges_init(void) 66 { 67 phandle node, obio_node; 68 int success; 69 70 num_obio_ranges = 0; 71 72 /* Check for obio and sbus ranges. */ 73 node = prom_getchild(prom_root_node); 74 obio_node = prom_searchsiblings(node, "obio"); 75 76 if (obio_node) { 77 success = prom_getproperty(obio_node, "ranges", 78 (char *) promlib_obio_ranges, 79 sizeof(promlib_obio_ranges)); 80 if (success != -1) 81 num_obio_ranges = (success / sizeof(struct linux_prom_ranges)); 82 } 83 84 if (num_obio_ranges) 85 prom_printf("PROMLIB: obio_ranges %d\n", num_obio_ranges); 86 } 87 88 void prom_apply_generic_ranges(phandle node, phandle parent, 89 struct linux_prom_registers *regs, int nregs) 90 { 91 int success; 92 int num_ranges; 93 struct linux_prom_ranges ranges[PROMREG_MAX]; 94 95 success = prom_getproperty(node, "ranges", 96 (char *) ranges, 97 sizeof(ranges)); 98 if (success != -1) { 99 num_ranges = (success / sizeof(struct linux_prom_ranges)); 100 if (parent) { 101 struct linux_prom_ranges parent_ranges[PROMREG_MAX]; 102 int num_parent_ranges; 103 104 success = prom_getproperty(parent, "ranges", 105 (char *) parent_ranges, 106 sizeof(parent_ranges)); 107 if (success != -1) { 108 num_parent_ranges = (success / sizeof(struct linux_prom_ranges)); 109 prom_adjust_ranges(ranges, num_ranges, parent_ranges, num_parent_ranges); 110 } 111 } 112 prom_adjust_regs(regs, nregs, ranges, num_ranges); 113 } 114 } 115