[PATCH] cfi_flash: Fix devicetree address determination
Andre Przywara
andre.przywara at arm.com
Fri Sep 18 19:45:32 CEST 2020
The cfi-flash driver uses an open-coded version of the generic
algorithm to decode and translate multiple frames of a "reg" property.
This starts off the wrong foot by using the address-cells and size-cells
properties of *this* very node, and not of the parent. This somewhat
happened to work back when we were using a wrong default size of 2,
but broke about a year ago with commit 0ba41ce1b781 ("libfdt: return
correct value if #size-cells property is not present").
Instead of fixing the reinvented wheel, just use the generic function
that does all of this properly.
This fixes U-Boot on QEMU (outside of EL1), which was crashing due to
decoding a wrong start address:
DRAM: 1 GiB
Flash: "Synchronous Abort" handler, esr 0x96000044
elr: 00000000000211dc lr : 00000000000211b0 (reloc)
elr: 000000007ff5e1dc lr : 000000007ff5e1b0
x0 : 00000000000000f0 x1 : 000000007ff5e1d8
x2 : 000000007edfbc48 x3 : 0000000000000000
x4 : 0000000000000000 x5 : 00000000000000f0
x6 : 000000007edfbc2c x7 : 0000000000000000
x8 : 000000007ffd8d70 x9 : 000000000000000c
x10: 0400000000000003 x11: 0000000000000055
^^^^^^^^^^^^^^^^
Signed-off-by: Andre Przywara <andre.przywara at arm.com>
---
drivers/mtd/cfi_flash.c | 25 +++++++------------------
1 file changed, 7 insertions(+), 18 deletions(-)
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
index b7289ba5394..656ff326e17 100644
--- a/drivers/mtd/cfi_flash.c
+++ b/drivers/mtd/cfi_flash.c
@@ -2468,29 +2468,18 @@ unsigned long flash_init(void)
#ifdef CONFIG_CFI_FLASH /* for driver model */
static int cfi_flash_probe(struct udevice *dev)
{
- const fdt32_t *cell;
- int addrc, sizec;
- int len, idx;
+ fdt_addr_t addr;
+ fdt_size_t size;
+ int idx;
- addrc = dev_read_addr_cells(dev);
- sizec = dev_read_size_cells(dev);
-
- /* decode regs; there may be multiple reg tuples. */
- cell = dev_read_prop(dev, "reg", &len);
- if (!cell)
- return -ENOENT;
- idx = 0;
- len /= sizeof(fdt32_t);
- while (idx < len) {
- phys_addr_t addr;
-
- addr = dev_translate_address(dev, cell + idx);
+ for (idx = 0; idx < CFI_MAX_FLASH_BANKS; idx++) {
+ addr = devfdt_get_addr_size_index(dev, idx, &size);
+ if (addr == FDT_ADDR_T_NONE)
+ break;
flash_info[cfi_flash_num_flash_banks].dev = dev;
flash_info[cfi_flash_num_flash_banks].base = addr;
cfi_flash_num_flash_banks++;
-
- idx += addrc + sizec;
}
gd->bd->bi_flashstart = flash_info[0].base;
--
2.17.5
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