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Subject[PATCH v6 net-next 11/18] net: mvpp2: enable global flow control
Date
From: Stefan Chulski <stefanc@marvell.com>

This patch enables global flow control in FW and in the
phylink validate mask.

Signed-off-by: Stefan Chulski <stefanc@marvell.com>
---
drivers/net/ethernet/marvell/mvpp2/mvpp2.h | 13 ++++++---
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 30 +++++++++++++++++++-
2 files changed, 38 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index ca84995..e010410 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -763,10 +763,12 @@
((kb) * 1024 - MVPP2_TX_FIFO_THRESHOLD_MIN)

/* MSS Flow control */
-#define MSS_SRAM_SIZE 0x800
-#define FC_QUANTA 0xFFFF
-#define FC_CLK_DIVIDER 100
-#define MSS_THRESHOLD_STOP 768
+#define MSS_SRAM_SIZE 0x800
+#define MSS_FC_COM_REG 0
+#define FLOW_CONTROL_ENABLE_BIT BIT(0)
+#define FC_QUANTA 0xFFFF
+#define FC_CLK_DIVIDER 100
+#define MSS_THRESHOLD_STOP 768

/* RX buffer constants */
#define MVPP2_SKB_SHINFO_SIZE \
@@ -1021,6 +1023,9 @@ struct mvpp2 {

/* CM3 SRAM pool */
struct gen_pool *sram_pool;
+
+ /* Global TX Flow Control config */
+ bool global_tx_fc;
};

struct mvpp2_pcpu_stats {
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 19a3f38..770f45a 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -92,6 +92,16 @@ static inline u32 mvpp2_cpu_to_thread(struct mvpp2 *priv, int cpu)
return cpu % priv->nthreads;
}

+static void mvpp2_cm3_write(struct mvpp2 *priv, u32 offset, u32 data)
+{
+ writel(data, priv->cm3_base + offset);
+}
+
+static u32 mvpp2_cm3_read(struct mvpp2 *priv, u32 offset)
+{
+ return readl(priv->cm3_base + offset);
+}
+
static struct page_pool *
mvpp2_create_page_pool(struct device *dev, int num, int len,
enum dma_data_direction dma_dir)
@@ -5951,6 +5961,11 @@ static void mvpp2_phylink_validate(struct phylink_config *config,
phylink_set(mask, Autoneg);
phylink_set_port_modes(mask);

+ if (port->priv->global_tx_fc) {
+ phylink_set(mask, Pause);
+ phylink_set(mask, Asym_Pause);
+ }
+
switch (state->interface) {
case PHY_INTERFACE_MODE_10GBASER:
case PHY_INTERFACE_MODE_XAUI:
@@ -6969,7 +6984,7 @@ static int mvpp2_probe(struct platform_device *pdev)
struct resource *res;
void __iomem *base;
int i, shared;
- int err;
+ int err, val;

priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -7023,6 +7038,10 @@ static int mvpp2_probe(struct platform_device *pdev)
return err;
else if (err)
dev_warn(&pdev->dev, "Fail to alloc CM3 SRAM\n");
+
+ /* Enable global Flow Control only if handler to SRAM not NULL */
+ if (priv->cm3_base)
+ priv->global_tx_fc = true;
}

if (priv->hw_version != MVPP21 && dev_of_node(&pdev->dev)) {
@@ -7190,6 +7209,15 @@ static int mvpp2_probe(struct platform_device *pdev)
goto err_port_probe;
}

+ /* Enable global flow control. In this stage global
+ * flow control enabled, but still disabled per port.
+ */
+ if (priv->global_tx_fc && priv->hw_version != MVPP21) {
+ val = mvpp2_cm3_read(priv, MSS_FC_COM_REG);
+ val |= FLOW_CONTROL_ENABLE_BIT;
+ mvpp2_cm3_write(priv, MSS_FC_COM_REG, val);
+ }
+
mvpp2_dbgfs_init(priv, pdev->name);

platform_set_drvdata(pdev, priv);
--
1.9.1
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