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Date:   Thu, 29 Dec 2016 17:10:27 +0000
From:   Joao Pinto <Joao.Pinto@...opsys.com>
To:     davem@...emloft.net
Cc:     peppe.cavallaro@...com, alexandre.torgue@...com,
        rayagond@...avyalabs.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Joao Pinto <Joao.Pinto@...opsys.com>
Subject: [PATCH] stmmac: adding EEE to GMAC4

This patch adds Energy Efficiency Ethernet to GMAC4.

Signed-off-by: Joao Pinto <jpinto@...opsys.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4.h      | 12 +++++
 drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 59 +++++++++++++++++++++++
 2 files changed, 71 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
index b524598..73d1dab 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
@@ -90,6 +90,18 @@ enum power_event {
 	power_down = 0x00000001,
 };
 
+/* Energy Efficient Ethernet (EEE) for GMAC4
+ *
+ * LPI status, timer and control register offset
+ */
+#define GMAC4_LPI_CTRL_STATUS	0xd0
+#define GMAC4_LPI_TIMER_CTRL	0xd4
+
+/* LPI control and status defines */
+#define GMAC4_LPI_CTRL_STATUS_LPITXA	BIT(19)	/* Enable LPI TX Automate */
+#define GMAC4_LPI_CTRL_STATUS_PLS	BIT(17) /* PHY Link Status */
+#define GMAC4_LPI_CTRL_STATUS_LPIEN	BIT(16)	/* LPI Enable */
+
 /* MAC Debug bitmap */
 #define GMAC_DEBUG_TFCSTS_MASK		GENMASK(18, 17)
 #define GMAC_DEBUG_TFCSTS_SHIFT		17
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index ecfbf57..02eab79 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -137,6 +137,61 @@ static void dwmac4_get_umac_addr(struct mac_device_info *hw,
 				   GMAC_ADDR_LOW(reg_n));
 }
 
+static void dwmac4_set_eee_mode(struct mac_device_info *hw)
+{
+	void __iomem *ioaddr = hw->pcsr;
+	u32 value;
+
+	/* Enable the link status receive on RGMII, SGMII ore SMII
+	 * receive path and instruct the transmit to enter in LPI
+	 * state.
+	 */
+	value = readl(ioaddr + GMAC4_LPI_CTRL_STATUS);
+	value |= GMAC4_LPI_CTRL_STATUS_LPIEN | GMAC4_LPI_CTRL_STATUS_LPITXA;
+
+	writel(value, ioaddr + GMAC4_LPI_CTRL_STATUS);
+}
+
+static void dwmac4_reset_eee_mode(struct mac_device_info *hw)
+{
+	void __iomem *ioaddr = hw->pcsr;
+	u32 value;
+
+	value = readl(ioaddr + GMAC4_LPI_CTRL_STATUS);
+	value &= ~(GMAC4_LPI_CTRL_STATUS_LPIEN | GMAC4_LPI_CTRL_STATUS_LPITXA);
+	writel(value, ioaddr + GMAC4_LPI_CTRL_STATUS);
+}
+
+static void dwmac4_set_eee_pls(struct mac_device_info *hw, int link)
+{
+	void __iomem *ioaddr = hw->pcsr;
+	u32 value;
+
+	value = readl(ioaddr + GMAC4_LPI_CTRL_STATUS);
+
+	if (link)
+		value |= GMAC4_LPI_CTRL_STATUS_PLS;
+	else
+		value &= ~GMAC4_LPI_CTRL_STATUS_PLS;
+
+	writel(value, ioaddr + GMAC4_LPI_CTRL_STATUS);
+}
+
+static void dwmac4_set_eee_timer(struct mac_device_info *hw, int ls, int tw)
+{
+	void __iomem *ioaddr = hw->pcsr;
+	int value = ((tw & 0xffff)) | ((ls & 0x7ff) << 16);
+
+	/* Program the timers in the LPI timer control register:
+	 * LS: minimum time (ms) for which the link
+	 *  status from PHY should be ok before transmitting
+	 *  the LPI pattern.
+	 * TW: minimum time (us) for which the core waits
+	 *  after it has stopped transmitting the LPI pattern.
+	 */
+	writel(value, ioaddr + GMAC4_LPI_TIMER_CTRL);
+}
+
 static void dwmac4_set_filter(struct mac_device_info *hw,
 			      struct net_device *dev)
 {
@@ -410,6 +465,10 @@ static const struct stmmac_ops dwmac4_ops = {
 	.pmt = dwmac4_pmt,
 	.set_umac_addr = dwmac4_set_umac_addr,
 	.get_umac_addr = dwmac4_get_umac_addr,
+	.set_eee_mode = dwmac4_set_eee_mode,
+	.reset_eee_mode = dwmac4_reset_eee_mode,
+	.set_eee_timer = dwmac4_set_eee_timer,
+	.set_eee_pls = dwmac4_set_eee_pls,
 	.pcs_ctrl_ane = dwmac4_ctrl_ane,
 	.pcs_rane = dwmac4_rane,
 	.pcs_get_adv_lp = dwmac4_get_adv_lp,
-- 
2.9.3

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