AM65 CPSW hardware can map the 6-bit DSCP/TOS field to
appropriate priority queue via DSCP to Priority mapping registers
(CPSW_PN_RX_PRI_MAP_REG).
We use the upper 3 bits of the DSCP field that indicate IP Precedence
to map traffic to 8 priority queues.
Signed-off-by: Roger Quadros <rogerq@xxxxxxxxxx>
---
drivers/net/ethernet/ti/am65-cpsw-nuss.c | 50 ++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 0520e9f4bea7..65fbf6727e02 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -71,6 +71,8 @@
#define AM65_CPSW_PORT_REG_RX_PRI_MAP 0x020
#define AM65_CPSW_PORT_REG_RX_MAXLEN 0x024
+#define AM65_CPSW_PORTN_REG_CTL 0x004
+#define AM65_CPSW_PORTN_REG_DSCP_MAP 0x120
#define AM65_CPSW_PORTN_REG_SA_L 0x308
#define AM65_CPSW_PORTN_REG_SA_H 0x30c
#define AM65_CPSW_PORTN_REG_TS_CTL 0x310
@@ -94,6 +96,10 @@
/* AM65_CPSW_PORT_REG_PRI_CTL */
#define AM65_CPSW_PORT_REG_PRI_CTL_RX_PTYPE_RROBIN BIT(8)
+/* AM65_CPSW_PN_REG_CTL */
+#define AM65_CPSW_PN_REG_CTL_DSCP_IPV4_EN BIT(1)
+#define AM65_CPSW_PN_REG_CTL_DSCP_IPV6_EN BIT(2)
+
/* AM65_CPSW_PN_TS_CTL register fields */
#define AM65_CPSW_PN_TS_CTL_TX_ANX_F_EN BIT(4)
#define AM65_CPSW_PN_TS_CTL_TX_VLAN_LT1_EN BIT(5)
@@ -176,6 +182,49 @@ static void am65_cpsw_port_set_sl_mac(struct am65_cpsw_port *slave,
writel(mac_lo, slave->port_base + AM65_CPSW_PORTN_REG_SA_L);
}
+#define AM65_CPSW_DSCP_MAX GENMASK(5, 0)
+#define AM65_CPSW_PRI_MAX GENMASK(2, 0)
+static int am65_cpsw_port_set_dscp_map(struct am65_cpsw_port *slave, u8 dscp, u8 pri)
+{
+ int reg_ofs;
+ int bit_ofs;
+ u32 val;
+
+ if (dscp > AM65_CPSW_DSCP_MAX)
+ return -EINVAL;
+
+ if (pri > AM65_CPSW_PRI_MAX)
+ return -EINVAL;
+
+ reg_ofs = (dscp / 8) * 4; /* reg offset to this dscp */
+ bit_ofs = 4 * (dscp % 8); /* bit offset to this dscp */
+ val = readl(slave->port_base + AM65_CPSW_PORTN_REG_DSCP_MAP + reg_ofs);
+ val &= ~(AM65_CPSW_PRI_MAX << bit_ofs); /* clear */
+ val |= pri << bit_ofs; /* set */
+ writel(val, slave->port_base + AM65_CPSW_PORTN_REG_DSCP_MAP + reg_ofs);
+ val = readl(slave->port_base + AM65_CPSW_PORTN_REG_DSCP_MAP + reg_ofs);
+
+ return 0;
+}
+
+static void am65_cpsw_port_enable_dscp_map(struct am65_cpsw_port *slave)
+{
+ int dscp, pri;
+ u32 val;
+
+ /* Map IP Precedence field to Priority */
+ for (dscp = 0; dscp <= AM65_CPSW_DSCP_MAX; dscp++) {
+ pri = dscp >> 3; /* Extract IP Precedence */
+ am65_cpsw_port_set_dscp_map(slave, dscp, pri);
+ }
+
+ /* enable port IPV4 and IPV6 DSCP for this port */
+ val = readl(slave->port_base + AM65_CPSW_PORTN_REG_CTL);
+ val |= AM65_CPSW_PN_REG_CTL_DSCP_IPV4_EN |
+ AM65_CPSW_PN_REG_CTL_DSCP_IPV6_EN;
+ writel(val, slave->port_base + AM65_CPSW_PORTN_REG_CTL);
+}
+
static void am65_cpsw_sl_ctl_reset(struct am65_cpsw_port *port)
{
cpsw_sl_reset(port->slave.mac_sl, 100);
@@ -921,6 +970,7 @@ static int am65_cpsw_nuss_ndo_slave_open(struct net_device *ndev)
common->usage_count++;
am65_cpsw_port_set_sl_mac(port, ndev->dev_addr);
+ am65_cpsw_port_enable_dscp_map(port);
if (common->is_emac_mode)
am65_cpsw_init_port_emac_ale(port);
--
2.34.1
