ar71xx: fix QCA955X SGMII link loss

[openwrt/staging/lynxis.git] / target / linux / ar71xx / files / drivers / net / ethernet / atheros / ag71xx / ag71xx_main.c

diff --git a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
index 54ec8e67b36cd917f025975387bfdcf102597144..109335ef0f1688b62d31cbcb77c7b243fac06977 100644 (file)
--- a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
+++ b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
@@ -31,6 +31,7 @@ MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
 #define ETH_SWITCH_HEADER_LEN  2
 
 static int ag71xx_tx_packets(struct ag71xx *ag, bool flush);
+static void ag71xx_qca955x_sgmii_init(void);
 
 static inline unsigned int ag71xx_max_frame_len(unsigned int mtu)
 {
@@ -610,6 +611,9 @@ __ag71xx_link_adjust(struct ag71xx *ag, bool update)
        if (update && pdata->set_speed)
                pdata->set_speed(ag->speed);
 
+       if (update && pdata->enable_sgmii_fixup)
+               ag71xx_qca955x_sgmii_init();
+
        ag71xx_wr(ag, AG71XX_REG_MAC_CFG2, cfg2);
        ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, fifo5);
        ag71xx_wr(ag, AG71XX_REG_MAC_IFCTL, ifctl);
@@ -913,6 +917,81 @@ static void ag71xx_tx_timeout(struct net_device *dev)
        schedule_delayed_work(&ag->restart_work, 1);
 }
 
+static void ag71xx_bit_set(void __iomem *reg, u32 bit)
+{
+       u32 val = __raw_readl(reg) | bit;
+       __raw_writel(val, reg);
+       __raw_readl(reg);
+}
+
+static void ag71xx_bit_clear(void __iomem *reg, u32 bit)
+{
+       u32 val = __raw_readl(reg) & ~bit;
+       __raw_writel(val, reg);
+       __raw_readl(reg);
+}
+
+static void ag71xx_qca955x_sgmii_init()
+{
+       void __iomem *gmac_base;
+       u32 mr_an_status, sgmii_status;
+       u8 tries = 0;
+
+       gmac_base = ioremap_nocache(QCA955X_GMAC_BASE, QCA955X_GMAC_SIZE);
+
+       if (!gmac_base)
+               goto sgmii_out;
+
+       mr_an_status = __raw_readl(gmac_base + QCA955X_GMAC_REG_MR_AN_STATUS);
+       if (!(mr_an_status & QCA955X_MR_AN_STATUS_AN_ABILITY))
+               goto sgmii_out;
+
+       __raw_writel(QCA955X_SGMII_RESET_RX_CLK_N_RESET ,
+                    gmac_base + QCA955X_GMAC_REG_SGMII_RESET);
+       __raw_readl(gmac_base + QCA955X_GMAC_REG_SGMII_RESET);
+       udelay(10);
+
+       /* Init sequence */
+       ag71xx_bit_set(gmac_base + QCA955X_GMAC_REG_SGMII_RESET,
+                      QCA955X_SGMII_RESET_HW_RX_125M_N);
+       udelay(10);
+
+       ag71xx_bit_set(gmac_base + QCA955X_GMAC_REG_SGMII_RESET,
+                      QCA955X_SGMII_RESET_RX_125M_N);
+       udelay(10);
+
+       ag71xx_bit_set(gmac_base + QCA955X_GMAC_REG_SGMII_RESET,
+                      QCA955X_SGMII_RESET_TX_125M_N);
+       udelay(10);
+
+       ag71xx_bit_set(gmac_base + QCA955X_GMAC_REG_SGMII_RESET,
+                      QCA955X_SGMII_RESET_RX_CLK_N);
+       udelay(10);
+
+       ag71xx_bit_set(gmac_base + QCA955X_GMAC_REG_SGMII_RESET,
+                      QCA955X_SGMII_RESET_TX_CLK_N);
+       udelay(10);
+
+       do {
+               ag71xx_bit_set(gmac_base + QCA955X_GMAC_REG_MR_AN_CONTROL,
+                              QCA955X_MR_AN_CONTROL_PHY_RESET |
+                              QCA955X_MR_AN_CONTROL_AN_ENABLE);
+               udelay(100);
+               ag71xx_bit_clear(gmac_base + QCA955X_GMAC_REG_MR_AN_CONTROL,
+                                QCA955X_MR_AN_CONTROL_PHY_RESET);
+               mdelay(10);
+               sgmii_status = __raw_readl(gmac_base + QCA955X_GMAC_REG_SGMII_DEBUG) & 0xF;
+
+               if (tries++ >= QCA955X_SGMII_LINK_WAR_MAX_TRY) {
+                       pr_warn("ag71xx: max retries for SGMII fixup exceeded!\n");
+                       break;
+               }
+       } while (!(sgmii_status == 0xf || sgmii_status == 0x10));
+
+sgmii_out:
+       iounmap(gmac_base);
+}
+
 static void ag71xx_restart_work_func(struct work_struct *work)
 {
        struct ag71xx *ag = container_of(work, struct ag71xx, restart_work.work);