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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>
This commit is contained in:
Sascha Hauer 2011-09-24 19:41:40 +02:00
parent ed8e58d77c
commit 81fae63497
1 changed files with 80 additions and 0 deletions
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80
common/memory.c
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@ -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