From ffcb31cdc3f20228ec0f82bcbc42162e336e2d87 Mon Sep 17 00:00:00 2001 From: Ahmad Fatoum Date: Sat, 10 Apr 2021 13:06:35 +0200 Subject: PBL: fdt: implement fdt_device_get_match_data Currently, the generic DT image can't properly have a PBL console, because it's only known at runtime what system we are running on. As we already parse the FDT in the PBL to get the memory regions, we could extract the board compatible as well and determine which UART to use. Add a helper to achieve this. Signed-off-by: Ahmad Fatoum Link: https://lore.barebox.org/20210410110638.2106658-1-ahmad@a3f.at Signed-off-by: Sascha Hauer --- include/pbl.h | 9 +++++++++ pbl/fdt.c | 35 +++++++++++++++++++++++++++++++++++ pbl/string.c | 12 ++++++++++++ 3 files changed, 56 insertions(+) diff --git a/include/pbl.h b/include/pbl.h index 194d5e7508..f58daec735 100644 --- a/include/pbl.h +++ b/include/pbl.h @@ -34,4 +34,13 @@ ssize_t pbl_fat_load(struct pbl_bio *, const char *filename, void *dest, size_t void fdt_find_mem(const void *fdt, unsigned long *membase, unsigned long *memsize); +struct fdt_device_id { + const char *compatible; + const void *data; +}; + +const void * +fdt_device_get_match_data(const void *fdt, const char *nodepath, + const struct fdt_device_id ids[]); + #endif /* __PBL_H__ */ diff --git a/pbl/fdt.c b/pbl/fdt.c index b4a40a514b..18ddb9f48a 100644 --- a/pbl/fdt.c +++ b/pbl/fdt.c @@ -68,3 +68,38 @@ err: pr_err("No memory, cannot continue\n"); while (1); } + +const void *fdt_device_get_match_data(const void *fdt, const char *nodepath, + const struct fdt_device_id ids[]) +{ + int node, length; + const char *list, *end; + const struct fdt_device_id *id; + + node = fdt_path_offset(fdt, nodepath); + if (node < 0) + return NULL; + + list = fdt_getprop(fdt, node, "compatible", &length); + if (!list) + return NULL; + + end = list + length; + + while (list < end) { + length = strnlen(list, end - list) + 1; + + /* Abort if the last string isn't properly NUL-terminated. */ + if (list + length > end) + return NULL; + + for (id = ids; id->compatible; id++) { + if (!strcasecmp(list, id->compatible)) + return id->data; + } + + list += length; + } + + return NULL; +} diff --git a/pbl/string.c b/pbl/string.c index e6c0997ebc..e96eb99fc2 100644 --- a/pbl/string.c +++ b/pbl/string.c @@ -7,6 +7,7 @@ #include #include #include +#include void *memcpy(void *__dest, __const void *__src, size_t __n) { @@ -98,6 +99,17 @@ int strcmp(const char *cs, const char *ct) return res; } +int strcasecmp(const char *s1, const char *s2) +{ + int c1, c2; + + do { + c1 = tolower(*s1++); + c2 = tolower(*s2++); + } while (c1 == c2 && c1 != 0); + return c1 - c2; +} + void *memchr(const void *s, int c, size_t count) { const unsigned char *p = s; -- cgit v1.2.3