[PATCH RFC net-next v2 2/8] net: stmmac: provide core phylink PCS infrastructure

["Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>]

There are some common operations shared between the dwmac hwifs, the
only difference is where they are located within the device. These
are already present in the form of dwmac_rane(), dwmac_ctrl_ane() and
dwmac_get_adv_lp(). Rather than use these (which don't quite fit with
phylink PCS, provide phylink PCS specific versions.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/Makefile  |  2 +-
 .../net/ethernet/stmicro/stmmac/stmmac_pcs.c  | 58 +++++++++++++++++++
 .../net/ethernet/stmicro/stmmac/stmmac_pcs.h  | 10 ++++
 3 files changed, 69 insertions(+), 1 deletion(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/stmmac_pcs.c

diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index c2f0e91f6bf8..9e15f7615ff4 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -6,7 +6,7 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o	\
 	      mmc_core.o stmmac_hwtstamp.o stmmac_ptp.o dwmac4_descs.o	\
 	      dwmac4_dma.o dwmac4_lib.o dwmac4_core.o dwmac5.o hwif.o \
 	      stmmac_tc.o dwxgmac2_core.o dwxgmac2_dma.o dwxgmac2_descs.o \
-	      stmmac_xdp.o stmmac_est.o \
+	      stmmac_xdp.o stmmac_est.o stmmac_pcs.o \
 	      $(stmmac-y)
 
 stmmac-$(CONFIG_STMMAC_SELFTESTS) += stmmac_selftests.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_pcs.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_pcs.c
new file mode 100644
index 000000000000..849e6f121505
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_pcs.c
@@ -0,0 +1,58 @@
+#include "common.h"
+#include "stmmac_pcs.h"
+
+int dwmac_pcs_config(struct mac_device_info *hw, unsigned int neg_mode,
+		     phy_interface_t interface,
+		     const unsigned long *advertising,
+		     unsigned int reg_base)
+{
+	u32 val;
+
+	val = readl(hw->pcsr + GMAC_AN_CTRL(reg_base));
+
+	val |= GMAC_AN_CTRL_ANE | GMAC_AN_CTRL_RAN;
+
+	if (hw->ps)
+		val |= GMAC_AN_CTRL_SGMRAL;
+
+	writel(val, hw->pcsr + GMAC_AN_CTRL(reg_base));
+
+	return 0;
+}
+
+void dwmac_pcs_get_state(struct mac_device_info *hw,
+			 struct phylink_link_state *state,
+			 unsigned int reg_base)
+{
+	u32 val;
+
+	val = readl(hw->pcsr + GMAC_ANE_LPA(reg_base));
+
+	linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+			 state->lp_advertising);
+
+	if (val & GMAC_ANE_FD) {
+		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
+				 state->lp_advertising);
+		linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
+				 state->lp_advertising);
+		linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
+				 state->lp_advertising);
+	}
+
+	if (val & GMAC_ANE_HD) {
+		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
+				 state->lp_advertising);
+		linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
+				 state->lp_advertising);
+		linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
+				 state->lp_advertising);
+	}
+
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT,
+			 state->lp_advertising,
+			 FIELD_GET(GMAC_ANE_PSE, val) & STMMAC_PCS_PAUSE);
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
+			 state->lp_advertising,
+			 FIELD_GET(GMAC_ANE_PSE, val) & STMMAC_PCS_ASYM_PAUSE);
+}
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_pcs.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_pcs.h
index 1bdf87b237c4..888485fa2761 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_pcs.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_pcs.h
@@ -137,4 +137,14 @@ static inline void dwmac_get_adv_lp(void __iomem *ioaddr, u32 reg,
 
 	adv_lp->lp_pause = (value & GMAC_ANE_PSE) >> GMAC_ANE_PSE_SHIFT;
 }
+
+int dwmac_pcs_config(struct mac_device_info *hw, unsigned int neg_mode,
+		     phy_interface_t interface,
+		     const unsigned long *advertising,
+		     unsigned int reg_base);
+
+void dwmac_pcs_get_state(struct mac_device_info *hw,
+			 struct phylink_link_state *state,
+			 unsigned int reg_base);
+
 #endif /* __STMMAC_PCS_H__ */
-- 
2.30.2