[PULL 21/23] hw/sd: Use sdbus_read_data() instead of sdbus_read_byte() when possible

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

Use the recently added sdbus_read_data() to read multiple
bytes at once, instead of looping calling sdbus_read_byte().

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200814092346.21825-8-f4bug@amsat.org>
---
 hw/sd/allwinner-sdhost.c  | 10 +++-------
 hw/sd/milkymist-memcard.c |  7 ++-----
 hw/sd/sdhci.c             | 28 ++++++++--------------------
 3 files changed, 13 insertions(+), 32 deletions(-)

diff --git a/hw/sd/allwinner-sdhost.c b/hw/sd/allwinner-sdhost.c
index eea5659c5f1..f9eb92c09ed 100644
--- a/hw/sd/allwinner-sdhost.c
+++ b/hw/sd/allwinner-sdhost.c
@@ -337,9 +337,7 @@ static uint32_t allwinner_sdhost_process_desc(AwSdHostState *s,
 
         /* Read from SD bus */
         } else {
-            for (uint32_t i = 0; i < buf_bytes; i++) {
-                buf[i] = sdbus_read_byte(&s->sdbus);
-            }
+            sdbus_read_data(&s->sdbus, buf, buf_bytes);
             cpu_physical_memory_write((desc->addr & DESC_SIZE_MASK) + num_done,
                                        buf, buf_bytes);
         }
@@ -518,10 +516,8 @@ static uint64_t allwinner_sdhost_read(void *opaque, hwaddr offset,
         break;
     case REG_SD_FIFO:      /* Read/Write FIFO */
         if (sdbus_data_ready(&s->sdbus)) {
-            res = sdbus_read_byte(&s->sdbus);
-            res |= sdbus_read_byte(&s->sdbus) << 8;
-            res |= sdbus_read_byte(&s->sdbus) << 16;
-            res |= sdbus_read_byte(&s->sdbus) << 24;
+            sdbus_read_data(&s->sdbus, &res, sizeof(uint32_t));
+            le32_to_cpus(&res);
             allwinner_sdhost_update_transfer_cnt(s, sizeof(uint32_t));
             allwinner_sdhost_auto_stop(s);
             allwinner_sdhost_update_irq(s);
diff --git a/hw/sd/milkymist-memcard.c b/hw/sd/milkymist-memcard.c
index 12e091a46e7..be89a938763 100644
--- a/hw/sd/milkymist-memcard.c
+++ b/hw/sd/milkymist-memcard.c
@@ -151,11 +151,8 @@ static uint64_t memcard_read(void *opaque, hwaddr addr,
         if (!s->enabled) {
             r = 0xffffffff;
         } else {
-            r = 0;
-            r |= sdbus_read_byte(&s->sdbus) << 24;
-            r |= sdbus_read_byte(&s->sdbus) << 16;
-            r |= sdbus_read_byte(&s->sdbus) << 8;
-            r |= sdbus_read_byte(&s->sdbus);
+            sdbus_read_data(&s->sdbus, &r, sizeof(r));
+            be32_to_cpus(&r);
         }
         break;
     case R_CLK2XDIV:
diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index ddf36915619..1785d7e1f79 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -399,8 +399,6 @@ static void sdhci_end_transfer(SDHCIState *s)
 /* Fill host controller's read buffer with BLKSIZE bytes of data from card */
 static void sdhci_read_block_from_card(SDHCIState *s)
 {
-    int index = 0;
-    uint8_t data;
     const uint16_t blk_size = s->blksize & BLOCK_SIZE_MASK;
 
     if ((s->trnmod & SDHC_TRNS_MULTI) &&
@@ -408,12 +406,9 @@ static void sdhci_read_block_from_card(SDHCIState *s)
         return;
     }
 
-    for (index = 0; index < blk_size; index++) {
-        data = sdbus_read_byte(&s->sdbus);
-        if (!FIELD_EX32(s->hostctl2, SDHC_HOSTCTL2, EXECUTE_TUNING)) {
-            /* Device is not in tuning */
-            s->fifo_buffer[index] = data;
-        }
+    if (!FIELD_EX32(s->hostctl2, SDHC_HOSTCTL2, EXECUTE_TUNING)) {
+        /* Device is not in tuning */
+        sdbus_read_data(&s->sdbus, s->fifo_buffer, blk_size);
     }
 
     if (FIELD_EX32(s->hostctl2, SDHC_HOSTCTL2, EXECUTE_TUNING)) {
@@ -574,7 +569,7 @@ static void sdhci_write_dataport(SDHCIState *s, uint32_t value, unsigned size)
 static void sdhci_sdma_transfer_multi_blocks(SDHCIState *s)
 {
     bool page_aligned = false;
-    unsigned int n, begin;
+    unsigned int begin;
     const uint16_t block_size = s->blksize & BLOCK_SIZE_MASK;
     uint32_t boundary_chk = 1 << (((s->blksize & ~BLOCK_SIZE_MASK) >> 12) + 12);
     uint32_t boundary_count = boundary_chk - (s->sdmasysad % boundary_chk);
@@ -596,9 +591,7 @@ static void sdhci_sdma_transfer_multi_blocks(SDHCIState *s)
                 SDHC_DAT_LINE_ACTIVE;
         while (s->blkcnt) {
             if (s->data_count == 0) {
-                for (n = 0; n < block_size; n++) {
-                    s->fifo_buffer[n] = sdbus_read_byte(&s->sdbus);
-                }
+                sdbus_read_data(&s->sdbus, s->fifo_buffer, block_size);
             }
             begin = s->data_count;
             if (((boundary_count + begin) < block_size) && page_aligned) {
@@ -662,13 +655,10 @@ static void sdhci_sdma_transfer_multi_blocks(SDHCIState *s)
 /* single block SDMA transfer */
 static void sdhci_sdma_transfer_single_block(SDHCIState *s)
 {
-    int n;
     uint32_t datacnt = s->blksize & BLOCK_SIZE_MASK;
 
     if (s->trnmod & SDHC_TRNS_READ) {
-        for (n = 0; n < datacnt; n++) {
-            s->fifo_buffer[n] = sdbus_read_byte(&s->sdbus);
-        }
+        sdbus_read_data(&s->sdbus, s->fifo_buffer, datacnt);
         dma_memory_write(s->dma_as, s->sdmasysad, s->fifo_buffer, datacnt);
     } else {
         dma_memory_read(s->dma_as, s->sdmasysad, s->fifo_buffer, datacnt);
@@ -731,7 +721,7 @@ static void get_adma_description(SDHCIState *s, ADMADescr *dscr)
 
 static void sdhci_do_adma(SDHCIState *s)
 {
-    unsigned int n, begin, length;
+    unsigned int begin, length;
     const uint16_t block_size = s->blksize & BLOCK_SIZE_MASK;
     ADMADescr dscr = {};
     int i;
@@ -765,9 +755,7 @@ static void sdhci_do_adma(SDHCIState *s)
             if (s->trnmod & SDHC_TRNS_READ) {
                 while (length) {
                     if (s->data_count == 0) {
-                        for (n = 0; n < block_size; n++) {
-                            s->fifo_buffer[n] = sdbus_read_byte(&s->sdbus);
-                        }
+                        sdbus_read_data(&s->sdbus, s->fifo_buffer, block_size);
                     }
                     begin = s->data_count;
                     if ((length + begin) < block_size) {
-- 
2.26.2