[RFC] mips: Enable bulk write optimization for all writes

mips_m4k_bulk_write_memory was only called from target_write_buffer as an
optimization when the word count was large enough.

Remove mips_m4k_bulk_write_memory from the target type, causing the default
implementation to call the regular mips_m4k_write_memory instead.

Perform the dispatch to bulk write in mips_m4k_write_memory, enabling the
optimization for target_write_memory() writes with size 4, in addition to
target_write_buffer() writes.

It also enables making the choice of bulk write vs regular write
specifically for the architecture and not relying on the generic target
code to make a sensible decision.

Change-Id: I295f21a67ceaa195802403f2518ea2e0a025c1c7
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/1215
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Tested-by: jenkins

diff --git a/src/target/mips_m4k.c b/src/target/mips_m4k.c
index 502e94058b01e63d4eaa5df44eac8ad594ce1909..fc2a3f808a27e6175cbb2c0e1288c09f3c91c108 100644 (file)
--- a/src/target/mips_m4k.c
+++ b/src/target/mips_m4k.c
@@ -46,6 +46,8 @@ static int mips_m4k_internal_restore(struct target *target, int current,
                uint32_t address, int handle_breakpoints,
                int debug_execution);
 static int mips_m4k_halt(struct target *target);
+static int mips_m4k_bulk_write_memory(struct target *target, uint32_t address,
+               uint32_t count, const uint8_t *buffer);
 
 static int mips_m4k_examine_debug_reason(struct target *target)
 {
@@ -978,6 +980,13 @@ static int mips_m4k_write_memory(struct target *target, uint32_t address,
                return ERROR_TARGET_NOT_HALTED;
        }
 
+       if (size == 4 && count > 32) {
+               int retval = mips_m4k_bulk_write_memory(target, address, count, buffer);
+               if (retval == ERROR_OK)
+                       return ERROR_OK;
+               LOG_WARNING("Falling back to non-bulk write");
+       }
+
        /* sanitize arguments */
        if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
                return ERROR_COMMAND_SYNTAX_ERROR;
@@ -1098,11 +1107,6 @@ static int mips_m4k_bulk_write_memory(struct target *target, uint32_t address,
 
        LOG_DEBUG("address: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "", address, count);
 
-       if (target->state != TARGET_HALTED) {
-               LOG_WARNING("target not halted");
-               return ERROR_TARGET_NOT_HALTED;
-       }
-
        /* check alignment */
        if (address & 0x3u)
                return ERROR_TARGET_UNALIGNED_ACCESS;
@@ -1116,8 +1120,8 @@ static int mips_m4k_bulk_write_memory(struct target *target, uint32_t address,
                                MIPS32_FASTDATA_HANDLER_SIZE,
                                &mips32->fast_data_area);
                if (retval != ERROR_OK) {
-                       LOG_WARNING("No working area available, falling back to non-bulk write");
-                       return mips_m4k_write_memory(target, address, 4, count, buffer);
+                       LOG_ERROR("No working area available");
+                       return retval;
                }
 
                /* reset fastadata state so the algo get reloaded */
@@ -1141,11 +1145,8 @@ static int mips_m4k_bulk_write_memory(struct target *target, uint32_t address,
        if (t != NULL)
                free(t);
 
-       if (retval != ERROR_OK) {
-               /* FASTDATA access failed, try normal memory write */
-               LOG_DEBUG("Fastdata access Failed, falling back to non-bulk write");
-               retval = mips_m4k_write_memory(target, address, 4, count, buffer);
-       }
+       if (retval != ERROR_OK)
+               LOG_ERROR("Fastdata access Failed");
 
        return retval;
 }
@@ -1368,7 +1369,6 @@ struct target_type mips_m4k_target = {
 
        .read_memory = mips_m4k_read_memory,
        .write_memory = mips_m4k_write_memory,
-       .bulk_write_memory = mips_m4k_bulk_write_memory,
        .checksum_memory = mips32_checksum_memory,
        .blank_check_memory = mips32_blank_check_memory,