1 files changed, 118 insertions, 0 deletions

diff --git a/arch/sparc/prom/ranges.c b/arch/sparc/prom/ranges.c
new file mode 100644
index 000000000000..a2920323c900
--- /dev/null
+++ b/arch/sparc/prom/ranges.c
@@ -0,0 +1,118 @@
+/* $Id: ranges.c,v 1.15 2001/12/19 00:29:51 davem Exp $
+ * ranges.c: Handle ranges in newer proms for obio/sbus.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#include <linux/init.h>
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+#include <asm/types.h>
+#include <asm/sbus.h>
+#include <asm/system.h>
+
+struct linux_prom_ranges promlib_obio_ranges[PROMREG_MAX];
+int num_obio_ranges;
+
+/* Adjust register values based upon the ranges parameters. */
+static void
+prom_adjust_regs(struct linux_prom_registers *regp, int nregs,
+                 struct linux_prom_ranges *rangep, int nranges)
+{
+        int regc, rngc;
+
+        for (regc = 0; regc < nregs; regc++) {
+                for (rngc = 0; rngc < nranges; rngc++)
+                        if (regp[regc].which_io == rangep[rngc].ot_child_space)
+                                break; /* Fount it */
+                if (rngc == nranges) /* oops */
+                        prom_printf("adjust_regs: Could not find range with matching bus type...\n");
+                regp[regc].which_io = rangep[rngc].ot_parent_space;
+                regp[regc].phys_addr -= rangep[rngc].ot_child_base;
+                regp[regc].phys_addr += rangep[rngc].ot_parent_base;
+        }
+}
+
+void
+prom_adjust_ranges(struct linux_prom_ranges *ranges1, int nranges1,
+                   struct linux_prom_ranges *ranges2, int nranges2)
+{
+        int rng1c, rng2c;
+
+        for(rng1c=0; rng1c < nranges1; rng1c++) {
+                for(rng2c=0; rng2c < nranges2; rng2c++)
+                        if(ranges1[rng1c].ot_parent_space == ranges2[rng2c].ot_child_space &&
+                           ranges1[rng1c].ot_parent_base >= ranges2[rng2c].ot_child_base &&
+                           ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base > 0U)
+                        break;
+                if(rng2c == nranges2) /* oops */
+                        prom_printf("adjust_ranges: Could not find matching bus type...\n");
+                else if (ranges1[rng1c].ot_parent_base + ranges1[rng1c].or_size > ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size)
+                        ranges1[rng1c].or_size =
+                                ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base;
+                ranges1[rng1c].ot_parent_space = ranges2[rng2c].ot_parent_space;
+                ranges1[rng1c].ot_parent_base += ranges2[rng2c].ot_parent_base;
+        }
+}
+
+/* Apply probed obio ranges to registers passed, if no ranges return. */
+void
+prom_apply_obio_ranges(struct linux_prom_registers *regs, int nregs)
+{
+        if(num_obio_ranges)
+                prom_adjust_regs(regs, nregs, promlib_obio_ranges, num_obio_ranges);
+}
+
+void __init prom_ranges_init(void)
+{
+        int node, obio_node;
+        int success;
+
+        num_obio_ranges = 0;
+
+        /* Check for obio and sbus ranges. */
+        node = prom_getchild(prom_root_node);
+        obio_node = prom_searchsiblings(node, "obio");
+
+        if(obio_node) {
+                success = prom_getproperty(obio_node, "ranges",
+                                           (char *) promlib_obio_ranges,
+                                           sizeof(promlib_obio_ranges));
+                if(success != -1)
+                        num_obio_ranges = (success/sizeof(struct linux_prom_ranges));
+        }
+
+        if(num_obio_ranges)
+                prom_printf("PROMLIB: obio_ranges %d\n", num_obio_ranges);
+
+        return;
+}
+
+void
+prom_apply_generic_ranges (int node, int parent, struct linux_prom_registers *regs, int nregs)
+{
+        int success;
+        int num_ranges;
+        struct linux_prom_ranges ranges[PROMREG_MAX];
+        
+        success = prom_getproperty(node, "ranges",
+                                   (char *) ranges,
+                                   sizeof (ranges));
+        if (success != -1) {
+                num_ranges = (success/sizeof(struct linux_prom_ranges));
+                if (parent) {
+                        struct linux_prom_ranges parent_ranges[PROMREG_MAX];
+                        int num_parent_ranges;
+                
+                        success = prom_getproperty(parent, "ranges",
+                                                   (char *) parent_ranges,
+                                                   sizeof (parent_ranges));
+                        if (success != -1) {
+                                num_parent_ranges = (success/sizeof(struct linux_prom_ranges));
+                                prom_adjust_ranges (ranges, num_ranges, parent_ranges, num_parent_ranges);
+                        }
+                }
+                prom_adjust_regs(regs, nregs, ranges, num_ranges);
+        }
+}