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Subject[PATCH net 5/5] stmmac: Configure Flow Control to work correctly based on rxfifo size
Date
Configure flow control correctly, and based on the receive fifo size read
as a property from the devicetree since the Synopsys stmmac fifo sizes are
configurable based on a particular chip's implementation. This patch maintains
the previous incorrect behavior unless the receive fifo size is found in the
devicetree.

Signed-off-by: Vince Bridgers <vbridger@opensource.altera.com>
---
drivers/net/ethernet/stmicro/stmmac/common.h | 5 +++--
.../net/ethernet/stmicro/stmmac/dwmac1000_dma.c | 26 +++++++++++++++++++++-
drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c | 2 +-
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 16 ++++++++-----
4 files changed, 40 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index cd77289..623c6ed 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -150,7 +150,7 @@ struct stmmac_extra_stats {
#define MAC_CSR_H_FRQ_MASK 0x20

#define HASH_TABLE_SIZE 64
-#define PAUSE_TIME 0x200
+#define PAUSE_TIME 0xffff

/* Flow Control defines */
#define FLOW_OFF 0
@@ -357,7 +357,8 @@ struct stmmac_dma_ops {
void (*dump_regs) (void __iomem *ioaddr);
/* Set tx/rx threshold in the csr6 register
* An invalid value enables the store-and-forward mode */
- void (*dma_mode) (void __iomem *ioaddr, int txmode, int rxmode);
+ void (*dma_mode)(void __iomem *ioaddr, int txmode, int rxmode,
+ int rxfifosz);
/* To track extra statistic (if supported) */
void (*dma_diagnostic_fr) (void *data, struct stmmac_extra_stats *x,
void __iomem *ioaddr);
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
index 59d92e8..0e8937c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
@@ -106,8 +106,29 @@ static int dwmac1000_dma_init(void __iomem *ioaddr, int pbl, int fb, int mb,
return 0;
}

+static u32 dwmac1000_configure_fc(u32 csr6, int rxfifosz)
+{
+ csr6 &= ~DMA_CONTROL_RFA_MASK;
+ csr6 &= ~DMA_CONTROL_RFD_MASK;
+
+ /* Leave flow control disabled if receive fifo size is less than
+ * 4K or 0. Otherwise, send XOFF when fifo is 1K less than full,
+ * and send XON when 2K less than full.
+ */
+ if (rxfifosz < 4096) {
+ csr6 &= ~DMA_CONTROL_EFC;
+ pr_debug("GMAC: disabling flow control, rxfifo too small(%d)\n",
+ rxfifosz);
+ } else {
+ csr6 |= DMA_CONTROL_EFC;
+ csr6 |= RFA_FULL_MINUS_1K;
+ csr6 |= RFD_FULL_MINUS_2K;
+ }
+ return csr6;
+}
+
static void dwmac1000_dma_operation_mode(void __iomem *ioaddr, int txmode,
- int rxmode)
+ int rxmode, int rxfifosz)
{
u32 csr6 = readl(ioaddr + DMA_CONTROL);

@@ -153,6 +174,9 @@ static void dwmac1000_dma_operation_mode(void __iomem *ioaddr, int txmode,
csr6 |= DMA_CONTROL_RTC_128;
}

+ /* Configure flow control based on rx fifo size */
+ csr6 = dwmac1000_configure_fc(csr6, rxfifosz);
+
writel(csr6, ioaddr + DMA_CONTROL);
}

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c
index 7d1dce9..9d0971c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c
@@ -72,7 +72,7 @@ static int dwmac100_dma_init(void __iomem *ioaddr, int pbl, int fb, int mb,
* control register.
*/
static void dwmac100_dma_operation_mode(void __iomem *ioaddr, int txmode,
- int rxmode)
+ int rxmode, int rxfifosz)
{
u32 csr6 = readl(ioaddr + DMA_CONTROL);

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index a0ea84f..73d104f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1277,8 +1277,10 @@ static void free_dma_desc_resources(struct stmmac_priv *priv)
*/
static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
{
+ int rxfifosz = priv->plat->rx_fifo_size;
+
if (priv->plat->force_thresh_dma_mode)
- priv->hw->dma->dma_mode(priv->ioaddr, tc, tc);
+ priv->hw->dma->dma_mode(priv->ioaddr, tc, tc, rxfifosz);
else if (priv->plat->force_sf_dma_mode || priv->plat->tx_coe) {
/*
* In case of GMAC, SF mode can be enabled
@@ -1287,10 +1289,12 @@ static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
* 2) There is no bugged Jumbo frame support
* that needs to not insert csum in the TDES.
*/
- priv->hw->dma->dma_mode(priv->ioaddr, SF_DMA_MODE, SF_DMA_MODE);
+ priv->hw->dma->dma_mode(priv->ioaddr, SF_DMA_MODE, SF_DMA_MODE,
+ rxfifosz);
priv->xstats.threshold = SF_DMA_MODE;
} else
- priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE);
+ priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE,
+ rxfifosz);
}

/**
@@ -1442,6 +1446,7 @@ static void stmmac_tx_err(struct stmmac_priv *priv)
static void stmmac_dma_interrupt(struct stmmac_priv *priv)
{
int status;
+ int rxfifosz = priv->plat->rx_fifo_size;

status = priv->hw->dma->dma_interrupt(priv->ioaddr, &priv->xstats);
if (likely((status & handle_rx)) || (status & handle_tx)) {
@@ -1456,10 +1461,11 @@ static void stmmac_dma_interrupt(struct stmmac_priv *priv)
(tc <= 256)) {
tc += 64;
if (priv->plat->force_thresh_dma_mode)
- priv->hw->dma->dma_mode(priv->ioaddr, tc, tc);
+ priv->hw->dma->dma_mode(priv->ioaddr, tc, tc,
+ rxfifosz);
else
priv->hw->dma->dma_mode(priv->ioaddr, tc,
- SF_DMA_MODE);
+ SF_DMA_MODE, rxfifosz);
priv->xstats.threshold = tc;
}
} else if (unlikely(status == tx_hard_error))
--
1.9.1


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