From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/sparc/prom/ranges.c | 114 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 arch/sparc/prom/ranges.c

(limited to 'arch/sparc/prom/ranges.c')

diff --git a/arch/sparc/prom/ranges.c b/arch/sparc/prom/ranges.c
new file mode 100644
index 000000000..20cb828bc
--- /dev/null
+++ b/arch/sparc/prom/ranges.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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 <linux/module.h>
+
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+#include <asm/types.h>
+
+static struct linux_prom_ranges promlib_obio_ranges[PROMREG_MAX];
+static 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;
+	}
+}
+
+static 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);
+}
+EXPORT_SYMBOL(prom_apply_obio_ranges);
+
+void __init prom_ranges_init(void)
+{
+	phandle 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);
+}
+
+void prom_apply_generic_ranges(phandle node, phandle 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);
+	}
+}
-- 
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