[U-Boot] [PATCH v5 07/13] net: ftgmac100: handle timeouts when transmitting

[Cédric Le Goater]

Signed-off-by: Cédric Le Goater <c...@kaod.org>
---

 Changes since v4 :

 - defined a custom wait_for_bit_*() macro

 drivers/net/ftgmac100.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/net/ftgmac100.c b/drivers/net/ftgmac100.c
index bf8600814690..ec46add1d35c 100644
--- a/drivers/net/ftgmac100.c
+++ b/drivers/net/ftgmac100.c
@@ -14,6 +14,7 @@
 #include <dm.h>
 #include <miiphy.h>
 #include <net.h>
+#include <wait_bit.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
 
@@ -28,6 +29,9 @@
 /* PKTBUFSTX/PKTBUFSRX must both be power of 2 */
 #define PKTBUFSTX      4       /* must be power of 2 */
 
+/* Timeout for transmit */
+#define FTGMAC100_TX_TIMEOUT_MS                1000
+
 /* Timeout for a mdio read/write operation */
 #define FTGMAC100_MDIO_TIMEOUT_USEC    10000
 
@@ -401,6 +405,19 @@ static int ftgmac100_recv(struct udevice *dev, int flags, 
uchar **packetp)
        return rxlen;
 }
 
+static u32 ftgmac100_read_txdesc(const void *desc)
+{
+       const struct ftgmac100_txdes *txdes = desc;
+       ulong des_start = (ulong)txdes;
+       ulong des_end = des_start + roundup(sizeof(*txdes), ARCH_DMA_MINALIGN);
+
+       invalidate_dcache_range(des_start, des_end);
+
+       return txdes->txdes0;
+}
+
+BUILD_WAIT_FOR_BIT(ftgmac100_txdone, u32, ftgmac100_read_txdesc)
+
 /*
  * Send a data block via Ethernet
  */
@@ -414,6 +431,7 @@ static int ftgmac100_send(struct udevice *dev, void 
*packet, int length)
                roundup(sizeof(*curr_des), ARCH_DMA_MINALIGN);
        ulong data_start;
        ulong data_end;
+       int rc;
 
        invalidate_dcache_range(des_start, des_end);
 
@@ -446,6 +464,12 @@ static int ftgmac100_send(struct udevice *dev, void 
*packet, int length)
        /* Start transmit */
        writel(1, &ftgmac100->txpd);
 
+       rc = wait_for_bit_ftgmac100_txdone(curr_des,
+                                          FTGMAC100_TXDES0_TXDMA_OWN, false,
+                                          FTGMAC100_TX_TIMEOUT_MS, true);
+       if (rc)
+               return rc;
+
        debug("%s(): packet sent\n", __func__);
 
        /* Move to next descriptor */
-- 
2.17.2

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