stmmac: add DT property so JL2101 can be loaded

This adds a DT property jl2xx1_delay to the stmmac driver, it accepts an integer value in millesecond Setting the jl2xx1_delay property under the ethernet node to any value larger than 0 will enable the PHY SoC handling for JL2xx1: 1. Stmmac driver waits the given delay before DMA engine initialized 2. Specific code injected through MDIO before MII bus initialized The default value is 0, which will disable the handling. And 1500(ms) is suggested for JL2101, which will delay the DMA engien initializa- tion by 1.5 second, and inject the code before MII bus initialization Co-authored-by: Portisch <hugo.portisch@yahoo.de>
CoreELEC · Jul 24, 2022 · 588b389 · 588b389
1 parent 5a21a03
commit 588b389
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diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
@@ -66,6 +66,11 @@ Optional properties:
 	    MAC HW capability register.
 - mdio: with compatible = "snps,dwmac-mdio", create and register mdio bus.
 
+- JL2XX1:
+	- jl2xx1_delay: add property with a value bigger than zero enables jl2xx1
+	    PHY SoC handling, integer (delay in millesecond).
+	    default 0, suggested 1500 for JL2101
+
 Examples:
 
 	stmmac_axi_setup: stmmac-axi-config {

diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -29,6 +29,20 @@ config STMMAC_PLATFORM
 
 if STMMAC_PLATFORM
 
+config STMMAC_JL2XX1
+	tristate "Allow STMMAC delay/MAC inject for JL2XXX"
+	default n
+	depends on STMMAC_PLATFORM
+	---help---
+	  This allows the STMMAC driver to be delayed and essential 
+	  MAC control codes injected when MII bus is initialized
+	  through setting device-tree property jl2xx1_delay in the 
+	  ethernet node
+
+	  jl2xx1_delay: integer, millesecond
+	    only add the delay and inject when larger than 0
+	    default 0, suggested 1500 for JL2101
+
 config DWMAC_GENERIC
 	tristate "Generic driver for DWMAC"
 	default STMMAC_PLATFORM

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1658,6 +1658,12 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 	if (priv->extend_desc && (priv->mode == STMMAC_RING_MODE))
 		atds = 1;
 
+#ifdef CONFIG_STMMAC_JL2XX1
+	if (priv->plat->jl2xx1_delay) {
+		msleep(priv->plat->jl2xx1_delay);
+	}
+#endif
+
 	ret = priv->hw->dma->reset(priv->ioaddr);
 	if (ret) {
 		dev_err(priv->device, "Failed to reset the dma\n");

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -330,6 +330,15 @@ int stmmac_mdio_register(struct net_device *ndev)
 		goto bus_register_fail;
 	}
 
+#ifdef CONFIG_STMMAC_JL2XX1
+	if (priv->plat->jl2xx1_delay) {
+		stmmac_mdio_write(new_bus,0,31,2627);
+		stmmac_mdio_write(new_bus,0,25,0x1801);
+		stmmac_mdio_write(new_bus,0,31,0);
+		stmmac_mdio_write(new_bus,0,0,0x8000);
+	}
+#endif
+
 	if (priv->plat->phy_node || mdio_node)
 		goto bus_register_done;
 

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -291,6 +291,11 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
 	plat->force_sf_dma_mode =
 		of_property_read_bool(np, "snps,force_sf_dma_mode");
 
+#ifdef CONFIG_STMMAC_JL2XX1
+	if (of_property_read_u32(np, "jl2xx1_delay", &plat->jl2xx1_delay))
+		plat->jl2xx1_delay = 0;
+#endif
+
 	/* Set the maxmtu to a default of JUMBO_LEN in case the
 	 * parameter is not present in the device tree.
 	 */

diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
@@ -142,5 +142,8 @@ struct plat_stmmacenet_data {
 	int has_gmac4;
 	bool tso_en;
 	int mac_port_sel_speed;
+#ifdef CONFIG_STMMAC_JL2XX1
+	int jl2xx1_delay;
+#endif
 };
 #endif