summaryrefslogtreecommitdiffstats
path: root/common/memory.c
diff options
context:
space:
mode:
authorSascha Hauer <s.hauer@pengutronix.de>2011-09-24 19:41:40 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2011-10-19 10:09:50 +0200
commit81fae63497d2f43ab6ec5f1370d6fc579971fe04 (patch)
treee9d5215f017a60c514ecf305c41a3437ce93c510 /common/memory.c
parented8e58d77c2cecacd6b9cfbfd9a884d61fb8a548 (diff)
downloadbarebox-81fae63497d2f43ab6ec5f1370d6fc579971fe04.tar.gz
oftree: add fixup for memory nodes
Thanks to a common memory handling barebox knows the sdram banks and sizes, so we can add a common fixup functions for the nodes in the devicetree. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'common/memory.c')
-rw-r--r--common/memory.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/common/memory.c b/common/memory.c
index 4d59f15..0ba9a18 100644
--- a/common/memory.c
+++ b/common/memory.c
@@ -22,6 +22,9 @@
#include <common.h>
#include <memory.h>
+#include <of.h>
+#include <init.h>
+#include <libfdt.h>
/*
* Begin and End of memory area for malloc(), and current "brk"
@@ -87,3 +90,80 @@ void barebox_add_memory_bank(const char *name, resource_size_t start,
list_add_tail(&bank->list, &memory_banks);
}
+
+#ifdef CONFIG_OFTREE
+
+/*
+ * Get cells len in bytes
+ * if #NNNN-cells property is 2 then len is 8
+ * otherwise len is 4
+ */
+static int get_cells_len(struct fdt_header *fdt, char *nr_cells_name)
+{
+ const u32 *cell;
+
+ cell = fdt_getprop(fdt, 0, nr_cells_name, NULL);
+ if (cell && *cell == 2)
+ return 8;
+
+ return 4;
+}
+
+/*
+ * Write a 4 or 8 byte big endian cell
+ */
+static void write_cell(u8 *addr, u64 val, int size)
+{
+ int shift = (size - 1) * 8;
+
+ while (size-- > 0) {
+ *addr++ = (val >> shift) & 0xff;
+ shift -= 8;
+ }
+}
+
+static int of_memory_fixup(struct fdt_header *fdt)
+{
+ struct memory_bank *bank;
+ int err, nodeoffset;
+ int addr_cell_len, size_cell_len, len = 0;
+ u8 tmp[16 * 16]; /* Up to 64-bit address + 64-bit size */
+
+ /* update, or add and update /memory node */
+ nodeoffset = fdt_get_path_or_create(fdt, "/memory");
+ if (nodeoffset < 0)
+ return nodeoffset;
+
+ err = fdt_setprop(fdt, nodeoffset, "device_type", "memory",
+ sizeof("memory"));
+ if (err < 0) {
+ printf("WARNING: could not set %s %s.\n", "device_type",
+ fdt_strerror(err));
+ return err;
+ }
+
+ addr_cell_len = get_cells_len(fdt, "#address-cells");
+ size_cell_len = get_cells_len(fdt, "#size-cells");
+
+ for_each_memory_bank(bank) {
+ write_cell(tmp + len, bank->start, addr_cell_len);
+ len += addr_cell_len;
+ write_cell(tmp + len, bank->size, size_cell_len);
+ len += size_cell_len;
+ }
+
+ err = fdt_setprop(fdt, nodeoffset, "reg", tmp, len);
+ if (err < 0) {
+ printf("WARNING: could not set %s %s.\n",
+ "reg", fdt_strerror(err));
+ return err;
+ }
+ return 0;
+}
+
+static int of_register_memory_fixup(void)
+{
+ return of_register_fixup(of_memory_fixup);
+}
+late_initcall(of_register_memory_fixup);
+#endif