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-rw-r--r--payloads/libpayload/include/libpayload.h19
-rw-r--r--payloads/libpayload/libc/lib.c52
2 files changed, 71 insertions, 0 deletions
diff --git a/payloads/libpayload/include/libpayload.h b/payloads/libpayload/include/libpayload.h
index 57a3afc6b1..80bfaae6bf 100644
--- a/payloads/libpayload/include/libpayload.h
+++ b/payloads/libpayload/include/libpayload.h
@@ -446,6 +446,25 @@ static inline int __ffs(u32 x) { return log2(x & (u32)(-(s32)x)); }
/**
+ * @defgroup mmio MMIO helper functions
+ * @{
+ */
+#if !CONFIG(LP_ARCH_MIPS)
+void buffer_from_fifo32(void *buffer, size_t size, void *fifo,
+ int fifo_stride, int fifo_width);
+void buffer_to_fifo32_prefix(void *buffer, u32 prefix, int prefsz, size_t size,
+ void *fifo, int fifo_stride, int fifo_width);
+static inline void buffer_to_fifo32(void *buffer, size_t size, void *fifo,
+ int fifo_stride, int fifo_width)
+{
+ buffer_to_fifo32_prefix(buffer, size, 0, 0, fifo,
+ fifo_stride, fifo_width);
+}
+#endif
+/** @} */
+
+
+/**
* @defgroup hash Hashing functions
* @{
*/
diff --git a/payloads/libpayload/libc/lib.c b/payloads/libpayload/libc/lib.c
index bead1f801b..081d7dd0e2 100644
--- a/payloads/libpayload/libc/lib.c
+++ b/payloads/libpayload/libc/lib.c
@@ -27,6 +27,7 @@
* SUCH DAMAGE.
*/
+#include <assert.h>
#include <libpayload.h>
/*
@@ -125,3 +126,54 @@ char *getenv(const char *name)
{
return NULL;
}
+
+#if !CONFIG(LP_ARCH_MIPS)
+/*
+ * Reads a transfer buffer from 32-bit FIFO registers. fifo_stride is the
+ * distance in bytes between registers (e.g. pass 4 for a normal array of 32-bit
+ * registers or 0 to read everything from the same register). fifo_width is
+ * the amount of bytes read per register (can be 1 through 4).
+ */
+void buffer_from_fifo32(void *buffer, size_t size, void *fifo,
+ int fifo_stride, int fifo_width)
+{
+ u8 *p = buffer;
+ int i, j;
+
+ assert(fifo_width > 0 && fifo_width <= sizeof(u32) &&
+ fifo_stride % sizeof(u32) == 0);
+
+ for (i = 0; i < size; i += fifo_width, fifo += fifo_stride) {
+ u32 val = read32(fifo);
+ for (j = 0; j < MIN(size - i, fifo_width); j++)
+ *p++ = (u8)(val >> (j * 8));
+ }
+}
+
+/*
+ * Version of buffer_to_fifo32() that can prepend a prefix of up to fifo_width
+ * size to the transfer. This is often useful for protocols where a command word
+ * precedes the actual payload data. The prefix must be packed in the low-order
+ * bytes of the 'prefix' u32 parameter and any high-order bytes exceeding prefsz
+ * must be 0. Note that 'size' counts total bytes written, including 'prefsz'.
+ */
+void buffer_to_fifo32_prefix(void *buffer, u32 prefix, int prefsz, size_t size,
+ void *fifo, int fifo_stride, int fifo_width)
+{
+ u8 *p = buffer;
+ int i, j = prefsz;
+
+ assert(fifo_width > 0 && fifo_width <= sizeof(u32) &&
+ fifo_stride % sizeof(u32) == 0 && prefsz <= fifo_width);
+
+ uint32_t val = prefix;
+ for (i = 0; i < size; i += fifo_width, fifo += fifo_stride) {
+ for (; j < MIN(size - i, fifo_width); j++)
+ val |= *p++ << (j * 8);
+ write32(fifo, val);
+ val = 0;
+ j = 0;
+ }
+
+}
+#endif