The RK3568 SoC integrates a Synopsys DesignWare XPCS that can be connected to GMAC0 or GMAC1 in SGMII mode. Add the necessary glue logic to support this configuration. The current dwmac-rk driver does not support SGMII mode. SGMII requires a PCS to handle auto-negotiation and link state reporting, but the existing driver only supports RGMII and RMII. Add a set_to_sgmii() callback to configure the GMAC GRF register for SGMII mode (bit 7). Also add a supports_sgmii flag to indicate SGMII capability. Provide pcs_init/pcs_exit callbacks to create/destroy the XPCS via xpcs_rk_create() from the Rockchip XPCS platform driver, and a select_pcs callback to return the XPCS to phylink. SGMII In-band vs Out-of-band ============================ On RK3568, the MAC clock is fixed at 125 MHz and cannot be dynamically changed by the stmmac core's set_clk_tx_rate callback. In-band mode works because the PCS handles rate adaptation internally. Out-of-band mode does not work because the MAC would need to change the clock rate to 125/12.5/1.25 MHz for 1000/100/10 Mbps respectively, and the clock is fixed. Enable default_an_inband for SGMII and disable the generic stmmac set_clk_tx_rate callback. This forces phylink to use in-band mode, where the PCS is responsible for speed/duplex negotiation. Without this, the stmmac core would attempt to change the clock rate on speed changes, causing TX to work but RX to fail. Link: https://dl.radxa.com/rock3/docs/hw/datasheet/Rockchip%20RK3568%20TRM%20Part1%20V1.1-20210301.pdf (Page 386) Signed-off-by: Coia Prant --- drivers/net/ethernet/stmicro/stmmac/Kconfig | 1 + .../net/ethernet/stmicro/stmmac/dwmac-rk.c | 87 ++++++++++++++++++- 2 files changed, 87 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig index e3dd5adda5aca..5088acc06982e 100644 --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig @@ -170,6 +170,7 @@ config DWMAC_ROCKCHIP default ARCH_ROCKCHIP depends on OF && (ARCH_ROCKCHIP || COMPILE_TEST) select MFD_SYSCON + select PCS_XPCS_ROCKCHIP help Support for Ethernet controller on Rockchip RK3288 SoC. diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c index 8d7042e689261..eca482b4b6bfc 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include "stmmac_platform.h" @@ -47,6 +48,7 @@ struct rk_gmac_ops { void (*set_to_rgmii)(struct rk_priv_data *bsp_priv, int tx_delay, int rx_delay); void (*set_to_rmii)(struct rk_priv_data *bsp_priv); + void (*set_to_sgmii)(struct rk_priv_data *bsp_priv); int (*set_speed)(struct rk_priv_data *bsp_priv, phy_interface_t interface, int speed); void (*integrated_phy_powerup)(struct rk_priv_data *bsp_priv); @@ -63,6 +65,7 @@ struct rk_gmac_ops { bool clock_grf_reg_in_php; bool supports_rgmii; bool supports_rmii; + bool supports_sgmii; bool php_grf_required; bool regs_valid; u32 regs[]; @@ -98,6 +101,7 @@ struct rk_priv_data { bool integrated_phy; bool supports_rgmii; bool supports_rmii; + bool supports_sgmii; struct clk_bulk_data *clks; int num_clks; @@ -809,6 +813,8 @@ static const struct rk_gmac_ops rk3528_ops = { #define RK3568_GRF_GMAC1_CON1 0x038c /* RK3568_GRF_GMAC0_CON1 && RK3568_GRF_GMAC1_CON1 */ +#define RK3568_GMAC_MODE_RMII_RGMII GRF_CLR_BIT(7) +#define RK3568_GMAC_MODE_SGMII_QSGMII GRF_BIT(7) #define RK3568_GMAC_FLOW_CTRL GRF_BIT(3) #define RK3568_GMAC_FLOW_CTRL_CLR GRF_CLR_BIT(3) #define RK3568_GMAC_RXCLK_DLY_ENABLE GRF_BIT(1) @@ -851,18 +857,32 @@ static void rk3568_set_to_rgmii(struct rk_priv_data *bsp_priv, RK3568_GMAC_CLK_TX_DL_CFG(tx_delay)); regmap_write(bsp_priv->grf, con1, + RK3568_GMAC_MODE_RMII_RGMII | RK3568_GMAC_RXCLK_DLY_ENABLE | RK3568_GMAC_TXCLK_DLY_ENABLE); } +static void rk3568_set_to_sgmii(struct rk_priv_data *bsp_priv) +{ + u32 con1; + + con1 = (bsp_priv->id == 1) ? RK3568_GRF_GMAC1_CON1 : + RK3568_GRF_GMAC0_CON1; + + regmap_write(bsp_priv->grf, con1, RK3568_GMAC_MODE_SGMII_QSGMII); +} + static const struct rk_gmac_ops rk3568_ops = { .init = rk3568_init, .set_to_rgmii = rk3568_set_to_rgmii, + .set_to_sgmii = rk3568_set_to_sgmii, + .set_speed = rk_set_clk_mac_speed, .gmac_phy_intf_sel_mask = GENMASK_U16(6, 4), .supports_rmii = true, + .supports_sgmii = true, .regs_valid = true, .regs = { @@ -1208,6 +1228,43 @@ static void rk_phy_powerdown(struct rk_priv_data *bsp_priv) dev_err(bsp_priv->dev, "fail to disable phy-supply\n"); } +static int rk_pcs_init(struct stmmac_priv *priv) +{ + struct device_node *np = priv->device->of_node; + struct device_node *pcs_node; + struct dw_xpcs *xpcs; + + pcs_node = of_parse_phandle(np, "pcs-handle", 0); + if (!pcs_node) + return -ENODEV; + + xpcs = xpcs_rk_create(priv->device, pcs_node); + of_node_put(pcs_node); + if (IS_ERR(xpcs)) + return PTR_ERR(xpcs); + + priv->hw->xpcs = xpcs; + return 0; +} + +static void rk_pcs_exit(struct stmmac_priv *priv) +{ + if (!priv->hw->xpcs) + return; + + xpcs_destroy(priv->hw->xpcs); + priv->hw->xpcs = NULL; +} + +static struct phylink_pcs *rk_select_pcs(struct stmmac_priv *priv, + phy_interface_t interface) +{ + if (!priv->hw->xpcs) + return NULL; + + return xpcs_to_phylink_pcs(priv->hw->xpcs); +} + static struct rk_priv_data *rk_gmac_setup(struct platform_device *pdev, struct plat_stmmacenet_data *plat, const struct rk_gmac_ops *ops) @@ -1330,6 +1387,7 @@ static struct rk_priv_data *rk_gmac_setup(struct platform_device *pdev, bsp_priv->supports_rgmii = ops->supports_rgmii || !!ops->set_to_rgmii; bsp_priv->supports_rmii = ops->supports_rmii || !!ops->set_to_rmii; + bsp_priv->supports_sgmii = ops->supports_sgmii || !!ops->set_to_sgmii; if (ops->init) { ret = ops->init(bsp_priv); @@ -1361,6 +1419,10 @@ static int rk_gmac_check_ops(struct rk_priv_data *bsp_priv) if (!bsp_priv->supports_rmii) return -EINVAL; break; + case PHY_INTERFACE_MODE_SGMII: + if (!bsp_priv->supports_sgmii) + return -EINVAL; + break; default: dev_err(bsp_priv->dev, "unsupported interface %d", bsp_priv->phy_iface); @@ -1379,6 +1441,9 @@ static int rk_gmac_powerup(struct rk_priv_data *bsp_priv) if (ret) return ret; + if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_SGMII) + goto set_mode; + ret = rk_get_phy_intf_sel(bsp_priv->phy_iface); if (ret < 0) return ret; @@ -1416,7 +1481,8 @@ static int rk_gmac_powerup(struct rk_priv_data *bsp_priv) } } - /*rmii or rgmii*/ +set_mode: + /* rmii, rgmii, sgmii */ switch (bsp_priv->phy_iface) { case PHY_INTERFACE_MODE_RGMII: dev_info(dev, "init for RGMII\n"); @@ -1447,6 +1513,11 @@ static int rk_gmac_powerup(struct rk_priv_data *bsp_priv) if (bsp_priv->ops->set_to_rmii) bsp_priv->ops->set_to_rmii(bsp_priv); break; + case PHY_INTERFACE_MODE_SGMII: + dev_info(dev, "init for SGMII\n"); + if (bsp_priv->ops->set_to_sgmii) + bsp_priv->ops->set_to_sgmii(bsp_priv); + break; default: dev_err(dev, "NO interface defined!\n"); } @@ -1486,6 +1557,9 @@ static void rk_get_interfaces(struct stmmac_priv *priv, void *bsp_priv, if (rk->supports_rmii) __set_bit(PHY_INTERFACE_MODE_RMII, interfaces); + + if (rk->supports_sgmii) + __set_bit(PHY_INTERFACE_MODE_SGMII, interfaces); } static int rk_set_clk_tx_rate(void *bsp_priv_, struct clk *clk_tx_i, @@ -1602,6 +1676,17 @@ static int rk_gmac_probe(struct platform_device *pdev) plat_dat->suspend = rk_gmac_suspend; plat_dat->resume = rk_gmac_resume; + if (plat_dat->phy_interface == PHY_INTERFACE_MODE_SGMII) { + /* SGMII clock always runs at 125 MHz */ + plat_dat->set_clk_tx_rate = NULL; + + /* SGMII requires a PCS */ + plat_dat->default_an_inband = true; + plat_dat->pcs_init = rk_pcs_init; + plat_dat->pcs_exit = rk_pcs_exit; + plat_dat->select_pcs = rk_select_pcs; + } + plat_dat->bsp_priv = rk_gmac_setup(pdev, plat_dat, data); if (IS_ERR(plat_dat->bsp_priv)) return PTR_ERR(plat_dat->bsp_priv); -- 2.47.3