[PATCH v2 RFC net-next 08/18] net: mvpp2: add FCA periodic timer configurations

stefanc
2021-01-24T12:01:16Z

Flow Control periodic timer would be used if port in
XOFF to transmit periodic XOFF frames.

Signed-off-by: Stefan Chulski <stefanc@marvell.com>
---
drivers/net/ethernet/marvell/mvpp2/mvpp2.h | 13 +++++-
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 45 ++++++++++++++++++++
2 files changed, 57 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index cac9885..0861c0b 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -596,6 +596,15 @@
#define MVPP22_MPCS_CLK_RESET_DIV_RATIO(n) ((n) << 4)
#define MVPP22_MPCS_CLK_RESET_DIV_SET BIT(11)

+/* FCA registers. PPv2.2 and PPv2.3 */
+#define MVPP22_FCA_BASE(port) (0x7600 + (port) * 0x1000)
+#define MVPP22_FCA_REG_SIZE 16
+#define MVPP22_FCA_REG_MASK 0xFFFF
+#define MVPP22_FCA_CONTROL_REG 0x0
+#define MVPP22_FCA_ENABLE_PERIODIC BIT(11)
+#define MVPP22_PERIODIC_COUNTER_LSB_REG (0x110)
+#define MVPP22_PERIODIC_COUNTER_MSB_REG (0x114)
+
/* XPCS registers. PPv2.2 and PPv2.3 */
#define MVPP22_XPCS_BASE(port) (0x7400 + (port) * 0x1000)
#define MVPP22_XPCS_CFG0 0x0
@@ -752,7 +761,9 @@
((kb) * 1024 - MVPP2_TX_FIFO_THRESHOLD_MIN)

/* MSS Flow control */
-#define MSS_SRAM_SIZE 0x800
+#define MSS_SRAM_SIZE 0x800
+#define FC_QUANTA 0xFFFF
+#define FC_CLK_DIVIDER 0x140

/* 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 7143909..9d69752 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -1293,6 +1293,49 @@ static void mvpp22_gop_init_10gkr(struct mvpp2_port *port)
writel(val, mpcs + MVPP22_MPCS_CLK_RESET);
}

+static void mvpp22_gop_fca_enable_periodic(struct mvpp2_port *port, bool en)
+{
+ struct mvpp2 *priv = port->priv;
+ void __iomem *fca = priv->iface_base + MVPP22_FCA_BASE(port->gop_id);
+ u32 val;
+
+ val = readl(fca + MVPP22_FCA_CONTROL_REG);
+ val &= ~MVPP22_FCA_ENABLE_PERIODIC;
+ if (en)
+ val |= MVPP22_FCA_ENABLE_PERIODIC;
+ writel(val, fca + MVPP22_FCA_CONTROL_REG);
+}
+
+static void mvpp22_gop_fca_set_timer(struct mvpp2_port *port, u32 timer)
+{
+ struct mvpp2 *priv = port->priv;
+ void __iomem *fca = priv->iface_base + MVPP22_FCA_BASE(port->gop_id);
+ u32 lsb, msb;
+
+ lsb = timer & MVPP22_FCA_REG_MASK;
+ msb = timer >> MVPP22_FCA_REG_SIZE;
+
+ writel(lsb, fca + MVPP22_PERIODIC_COUNTER_LSB_REG);
+ writel(msb, fca + MVPP22_PERIODIC_COUNTER_MSB_REG);
+}
+
+/* Set Flow Control timer x140 faster than pause quanta to ensure that link
+ * partner won't send taffic if port in XOFF mode.
+ */
+static void mvpp22_gop_fca_set_periodic_timer(struct mvpp2_port *port)
+{
+ u32 timer;
+
+ timer = (port->priv->tclk / (USEC_PER_SEC * FC_CLK_DIVIDER))
+ * FC_QUANTA;
+
+ mvpp22_gop_fca_enable_periodic(port, false);
+
+ mvpp22_gop_fca_set_timer(port, timer);
+
+ mvpp22_gop_fca_enable_periodic(port, true);
+}
+
static int mvpp22_gop_init(struct mvpp2_port *port)
{
struct mvpp2 *priv = port->priv;
@@ -1337,6 +1380,8 @@ static int mvpp22_gop_init(struct mvpp2_port *port)
val |= GENCONF_SOFT_RESET1_GOP;
regmap_write(priv->sysctrl_base, GENCONF_SOFT_RESET1, val);

+ mvpp22_gop_fca_set_periodic_timer(port);
+
unsupported_conf:
return 0;

--
1.9.1