diff options
Diffstat (limited to 'arch/arm/mach-rockchip/spl-boot-order.c')
| -rw-r--r-- | arch/arm/mach-rockchip/spl-boot-order.c | 48 |
1 files changed, 47 insertions, 1 deletions
diff --git a/arch/arm/mach-rockchip/spl-boot-order.c b/arch/arm/mach-rockchip/spl-boot-order.c index 4f78c72720..843998dfdc 100644 --- a/arch/arm/mach-rockchip/spl-boot-order.c +++ b/arch/arm/mach-rockchip/spl-boot-order.c @@ -10,6 +10,25 @@ #include <spl.h> #if CONFIG_IS_ENABLED(OF_CONTROL) +/** + * spl_node_to_boot_device() - maps from a DT-node to a SPL boot device + * @node: of_offset of the node + * + * The SPL framework uses BOOT_DEVICE_... constants to identify its boot + * sources. These may take on a device-specific meaning, depending on + * what nodes are enabled in a DTS (e.g. BOOT_DEVICE_MMC1 may refer to + * different controllers/block-devices, depending on which SD/MMC controllers + * are enabled in any given DTS). This function maps from a DT-node back + * onto a BOOT_DEVICE_... constant, considering the currently active devices. + * + * Returns + * -ENOENT, if no device matching the node could be found + * -ENOSYS, if the device matching the node can not be mapped onto a + * SPL boot device (e.g. the third MMC device) + * -1, for unspecified failures + * a positive integer (from the BOOT_DEVICE_... family) on succes. + */ + static int spl_node_to_boot_device(int node) { struct udevice *parent; @@ -57,6 +76,24 @@ static int spl_node_to_boot_device(int node) return -1; } +/** + * board_spl_was_booted_from() - retrieves the of-path the SPL was loaded from + * + * To support a 'same-as-spl' specification in the search-order for the next + * stage, we need a SoC- or board-specific way to handshake with what 'came + * before us' (either a BROM or TPL stage) and map the info retrieved onto + * a OF path. + * + * Returns + * NULL, on failure or if the device could not be identified + * a of_path (a string), on success + */ +__weak const char *board_spl_was_booted_from(void) +{ + debug("%s: no support for 'same-as-spl' for this board\n", __func__); + return NULL; +} + void board_boot_order(u32 *spl_boot_list) { const void *blob = gd->fdt_blob; @@ -78,8 +115,17 @@ void board_boot_order(u32 *spl_boot_list) (conf = fdt_stringlist_get(blob, chosen_node, "u-boot,spl-boot-order", elem, NULL)); elem++) { + const char *alias; + + /* Handle the case of 'same device the SPL was loaded from' */ + if (strncmp(conf, "same-as-spl", 11) == 0) { + conf = board_spl_was_booted_from(); + if (!conf) + continue; + } + /* First check if the list element is an alias */ - const char *alias = fdt_get_alias(blob, conf); + alias = fdt_get_alias(blob, conf); if (alias) conf = alias; |