metag: TCM support

Add some TCM support

Signed-off-by: James Hogan <james.hogan@imgtec.com>

1 files changed, 81 insertions, 0 deletions

diff --git a/arch/metag/mm/numa.c b/arch/metag/mm/numa.c
new file mode 100644
index 000000000000..9ae578c9b620
--- /dev/null
+++ b/arch/metag/mm/numa.c
@@ -0,0 +1,81 @@
+/*
+ *  Multiple memory node support for Meta machines
+ *
+ *  Copyright (C) 2007  Paul Mundt
+ *  Copyright (C) 2010  Imagination Technologies Ltd.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/export.h>
+#include <linux/bootmem.h>
+#include <linux/memblock.h>
+#include <linux/mm.h>
+#include <linux/numa.h>
+#include <linux/pfn.h>
+#include <asm/sections.h>
+
+struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
+EXPORT_SYMBOL_GPL(node_data);
+
+extern char _heap_start[];
+
+/*
+ * On Meta machines the conventional approach is to stash system RAM
+ * in node 0, and other memory blocks in to node 1 and up, ordered by
+ * latency. Each node's pgdat is node-local at the beginning of the node,
+ * immediately followed by the node mem map.
+ */
+void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
+{
+	unsigned long bootmap_pages, bootmem_paddr;
+	unsigned long start_pfn, end_pfn;
+	unsigned long pgdat_paddr;
+
+	/* Don't allow bogus node assignment */
+	BUG_ON(nid > MAX_NUMNODES || nid <= 0);
+
+	start_pfn = start >> PAGE_SHIFT;
+	end_pfn = end >> PAGE_SHIFT;
+
+	memblock_add(start, end - start);
+
+	memblock_set_node(PFN_PHYS(start_pfn),
+			  PFN_PHYS(end_pfn - start_pfn), nid);
+
+	/* Node-local pgdat */
+	pgdat_paddr = memblock_alloc_base(sizeof(struct pglist_data),
+					  SMP_CACHE_BYTES, end);
+	NODE_DATA(nid) = __va(pgdat_paddr);
+	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
+
+	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
+	NODE_DATA(nid)->node_start_pfn = start_pfn;
+	NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
+
+	/* Node-local bootmap */
+	bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
+	bootmem_paddr = memblock_alloc_base(bootmap_pages << PAGE_SHIFT,
+					    PAGE_SIZE, end);
+	init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
+			  start_pfn, end_pfn);
+
+	free_bootmem_with_active_regions(nid, end_pfn);
+
+	/* Reserve the pgdat and bootmap space with the bootmem allocator */
+	reserve_bootmem_node(NODE_DATA(nid), pgdat_paddr & PAGE_MASK,
+			     sizeof(struct pglist_data), BOOTMEM_DEFAULT);
+	reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr,
+			     bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
+
+	/* It's up */
+	node_set_online(nid);
+
+	/* Kick sparsemem */
+	sparse_memory_present_with_active_regions(nid);
+}
+
+void __init __weak soc_mem_setup(void)
+{
+}