diff options
Diffstat (limited to 'target/linux/ath79/files/drivers')
| -rw-r--r-- | target/linux/ath79/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/target/linux/ath79/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c b/target/linux/ath79/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c index 0924b81b92..6123a26f2c 100644 --- a/target/linux/ath79/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c +++ b/target/linux/ath79/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c @@ -559,6 +559,112 @@ static void ath79_set_pll(struct ag71xx *ag) udelay(100); } +static void ag71xx_bit_set(void __iomem *reg, u32 bit) +{ + u32 val; + + val = __raw_readl(reg) | bit; + __raw_writel(val, reg); + __raw_readl(reg); +} + +static void ag71xx_bit_clear(void __iomem *reg, u32 bit) +{ + u32 val; + + val = __raw_readl(reg) & ~bit; + __raw_writel(val, reg); + __raw_readl(reg); +} + +static void ag71xx_sgmii_init_qca955x(struct device_node *np) +{ + struct device_node *np_dev; + void __iomem *gmac_base; + u32 mr_an_status; + u32 sgmii_status; + u8 tries = 0; + int err = 0; + + np = of_get_child_by_name(np, "gmac-config"); + if (!np) + return; + + np_dev = of_parse_phandle(np, "device", 0); + if (!np_dev) + goto out; + + gmac_base = of_iomap(np_dev, 0); + if (!gmac_base) { + pr_err("%pOF: can't map GMAC registers\n", np_dev); + err = -ENOMEM; + goto err_iomap; + } + + 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; + + /* SGMII reset sequence */ + __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); + + 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); + + /* + * The following is what QCA has to say about what happens here: + * + * Across resets SGMII link status goes to weird state. + * If SGMII_DEBUG register reads other than 0x1f or 0x10, + * we are for sure in a bad state. + * + * Issue a PHY reset in MR_AN_CONTROL to keep going. + */ + 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(200); + ag71xx_bit_clear(gmac_base + QCA955X_GMAC_REG_MR_AN_CONTROL, + QCA955X_MR_AN_CONTROL_PHY_RESET); + mdelay(300); + sgmii_status = __raw_readl(gmac_base + QCA955X_GMAC_REG_SGMII_DEBUG) & + QCA955X_SGMII_DEBUG_TX_STATE_MASK; + + if (tries++ >= 20) { + pr_err("ag71xx: max retries for SGMII fixup exceeded\n"); + break; + } + } while (!(sgmii_status == 0xf || sgmii_status == 0x10)); + +sgmii_out: + iounmap(gmac_base); +err_iomap: + of_node_put(np_dev); +out: + of_node_put(np); +} + static void ath79_mii_ctrl_set_if(struct ag71xx *ag, unsigned int mii_if) { u32 t; @@ -707,6 +813,8 @@ __ag71xx_link_adjust(struct ag71xx *ag, bool update) of_device_is_compatible(np, "qca,qca9550-eth") || of_device_is_compatible(np, "qca,qca9560-eth")) { ath79_set_pllval(ag); + if (of_property_read_bool(np, "qca955x-sgmii-fixup")) + ag71xx_sgmii_init_qca955x(np); } } |