1 files changed, 112 insertions, 0 deletions
diff --git a/arch/sparc/kernel/starfire.c b/arch/sparc/kernel/starfire.c
new file mode 100644
index 000000000..b8cd57d91
--- /dev/null
+++ b/arch/sparc/kernel/starfire.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * starfire.c: Starfire/E10000 support.
+ *
+ * Copyright (C) 1998 David S. Miller (davem@redhat.com)
+ * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+#include <asm/page.h>
+#include <asm/oplib.h>
+#include <asm/smp.h>
+#include <asm/upa.h>
+#include <asm/starfire.h>
+
+/*
+ * A few places around the kernel check this to see if
+ * they need to call us to do things in a Starfire specific
+ * way.
+ */
+int this_is_starfire = 0;
+
+void check_if_starfire(void)
+{
+	phandle ssnode = prom_finddevice("/ssp-serial");
+	if (ssnode != 0 && (s32)ssnode != -1)
+		this_is_starfire = 1;
+}
+
+/*
+ * Each Starfire board has 32 registers which perform translation
+ * and delivery of traditional interrupt packets into the extended
+ * Starfire hardware format.  Essentially UPAID's now have 2 more
+ * bits than in all previous Sun5 systems.
+ */
+struct starfire_irqinfo {
+	unsigned long imap_slots[32];
+	unsigned long tregs[32];
+	struct starfire_irqinfo *next;
+	int upaid, hwmid;
+};
+
+static struct starfire_irqinfo *sflist = NULL;
+
+/* Beam me up Scott(McNeil)y... */
+void starfire_hookup(int upaid)
+{
+	struct starfire_irqinfo *p;
+	unsigned long treg_base, hwmid, i;
+
+	p = kmalloc(sizeof(*p), GFP_KERNEL);
+	if (!p) {
+		prom_printf("starfire_hookup: No memory, this is insane.\n");
+		prom_halt();
+	}
+	treg_base = 0x100fc000000UL;
+	hwmid = ((upaid & 0x3c) << 1) |
+		((upaid & 0x40) >> 4) |
+		(upaid & 0x3);
+	p->hwmid = hwmid;
+	treg_base += (hwmid << 33UL);
+	treg_base += 0x200UL;
+	for (i = 0; i < 32; i++) {
+		p->imap_slots[i] = 0UL;
+		p->tregs[i] = treg_base + (i * 0x10UL);
+		/* Lets play it safe and not overwrite existing mappings */
+		if (upa_readl(p->tregs[i]) != 0)
+			p->imap_slots[i] = 0xdeadbeaf;
+	}
+	p->upaid = upaid;
+	p->next = sflist;
+	sflist = p;
+}
+
+unsigned int starfire_translate(unsigned long imap,
+				unsigned int upaid)
+{
+	struct starfire_irqinfo *p;
+	unsigned int bus_hwmid;
+	unsigned int i;
+
+	bus_hwmid = (((unsigned long)imap) >> 33) & 0x7f;
+	for (p = sflist; p != NULL; p = p->next)
+		if (p->hwmid == bus_hwmid)
+			break;
+	if (p == NULL) {
+		prom_printf("XFIRE: Cannot find irqinfo for imap %016lx\n",
+			    ((unsigned long)imap));
+		prom_halt();
+	}
+	for (i = 0; i < 32; i++) {
+		if (p->imap_slots[i] == imap ||
+		    p->imap_slots[i] == 0UL)
+			break;
+	}
+	if (i == 32) {
+		printk("starfire_translate: Are you kidding me?\n");
+		panic("Lucy in the sky....");
+	}
+	p->imap_slots[i] = imap;
+
+	/* map to real upaid */
+	upaid = (((upaid & 0x3c) << 1) |
+		 ((upaid & 0x40) >> 4) |
+		 (upaid & 0x3));
+
+	upa_writel(upaid, p->tregs[i]);
+
+	return i;
+}