[PATCH v13 net-next 15/15] net: mvpp2: add TX FC firmware check

From: stefanc
Date: Thu Feb 11 2021 - 06:18:11 EST


From: Stefan Chulski <stefanc@xxxxxxxxxxx>

Patch check that TX FC firmware is running in CM3.
If not, global TX FC would be disabled.

Signed-off-by: Stefan Chulski <stefanc@xxxxxxxxxxx>
Acked-by: Marcin Wojtas <mw@xxxxxxxxxxxx>
---
drivers/net/ethernet/marvell/mvpp2/mvpp2.h | 1 +
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 39 ++++++++++++++++----
2 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index b61a1ba..da87152 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -828,6 +828,7 @@

#define MSS_THRESHOLD_STOP 768
#define MSS_THRESHOLD_START 1024
+#define MSS_FC_MAX_TIMEOUT 5000

/* RX buffer constants */
#define MVPP2_SKB_SHINFO_SIZE \
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 883d742..4ff195a 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -924,6 +924,34 @@ static void mvpp2_bm_pool_update_fc(struct mvpp2_port *port,
spin_unlock_irqrestore(&port->priv->mss_spinlock, flags);
}

+static int mvpp2_enable_global_fc(struct mvpp2 *priv)
+{
+ int val, timeout = 0;
+
+ /* Enable global flow control. In this stage global
+ * flow control enabled, but still disabled per port.
+ */
+ val = mvpp2_cm3_read(priv, MSS_FC_COM_REG);
+ val |= FLOW_CONTROL_ENABLE_BIT;
+ mvpp2_cm3_write(priv, MSS_FC_COM_REG, val);
+
+ /* Check if Firmware running and disable FC if not*/
+ val |= FLOW_CONTROL_UPDATE_COMMAND_BIT;
+ mvpp2_cm3_write(priv, MSS_FC_COM_REG, val);
+
+ while (timeout < MSS_FC_MAX_TIMEOUT) {
+ val = mvpp2_cm3_read(priv, MSS_FC_COM_REG);
+
+ if (!(val & FLOW_CONTROL_UPDATE_COMMAND_BIT))
+ return 0;
+ usleep_range(10, 20);
+ timeout++;
+ }
+
+ priv->global_tx_fc = false;
+ return -EOPNOTSUPP;
+}
+
/* Release buffer to BM */
static inline void mvpp2_bm_pool_put(struct mvpp2_port *port, int pool,
dma_addr_t buf_dma_addr,
@@ -7256,7 +7284,7 @@ static int mvpp2_probe(struct platform_device *pdev)
struct resource *res;
void __iomem *base;
int i, shared;
- int err, val;
+ int err;

priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -7480,13 +7508,10 @@ 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);
+ err = mvpp2_enable_global_fc(priv);
+ if (err)
+ dev_warn(&pdev->dev, "Minimum of CM3 firmware 18.09 and chip revision B0 required for flow control\n");
}

mvpp2_dbgfs_init(priv, pdev->name);
--
1.9.1