ramips: ethernet: ralink: rewrite esw_rt3050 to support link states

Ensure the esw is initialized before the ethernet device is sending
packets. Further implement carrier detection similar to mt7620.
If any port has a link, the ethernet device will detect a carrier.

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

3 files changed, 103 insertions, 45 deletions

diff --git a/target/linux/ramips/files/drivers/net/ethernet/ralink/esw_rt3050.c b/target/linux/ramips/files/drivers/net/ethernet/ralink/esw_rt3050.c
index 4a7dbb2d03..75b6707be2 100644
--- a/target/linux/ramips/files/drivers/net/ethernet/ralink/esw_rt3050.c
+++ b/target/linux/ramips/files/drivers/net/ethernet/ralink/esw_rt3050.c
@@ -24,6 +24,7 @@
 #include <linux/reset.h>
 
 #include "mtk_eth_soc.h"
+#include "esw_rt3050.h"
 
 /* HW limitations for this switch:
  * - No large frame support (PKT_MAX_LEN at most 1536)
@@ -216,6 +217,7 @@ struct rt305x_esw {
 	struct device		*dev;
 	void __iomem		*base;
 	int			irq;
+	struct fe_priv		*priv;
 
 	/* Protects against concurrent register r/w operations. */
 	spinlock_t		reg_rw_lock;
@@ -736,19 +738,44 @@ static void esw_hw_init(struct rt305x_esw *esw)
 	esw_w32(esw, ~RT305X_ESW_PORT_ST_CHG, RT305X_ESW_REG_IMR);
 }
 
+
+int rt3050_esw_has_carrier(struct fe_priv *priv)
+{
+	struct rt305x_esw *esw = priv->soc->swpriv;
+	u32 link;
+	int i;
+	bool cpuport;
+
+	link = esw_r32(esw, RT305X_ESW_REG_POA);
+	link >>= RT305X_ESW_POA_LINK_SHIFT;
+	cpuport = link & BIT(RT305X_ESW_PORT6);
+	link &= RT305X_ESW_POA_LINK_MASK;
+	for (i = 0; i <= RT305X_ESW_PORT5; i++) {
+		if (priv->link[i] != (link & BIT(i)))
+			dev_info(esw->dev, "port %d link %s\n", i, link & BIT(i) ? "up" : "down");
+		priv->link[i] = link & BIT(i);
+	}
+
+	return !!link && cpuport;
+}
+
 static irqreturn_t esw_interrupt(int irq, void *_esw)
 {
-	struct rt305x_esw *esw = (struct rt305x_esw *)_esw;
+	struct rt305x_esw *esw = (struct rt305x_esw *) _esw;
 	u32 status;
+	int i;
 
 	status = esw_r32(esw, RT305X_ESW_REG_ISR);
 	if (status & RT305X_ESW_PORT_ST_CHG) {
-		u32 link = esw_r32(esw, RT305X_ESW_REG_POA);
-
-		link >>= RT305X_ESW_POA_LINK_SHIFT;
-		link &= RT305X_ESW_POA_LINK_MASK;
-		dev_info(esw->dev, "link changed 0x%02X\n", link);
+		if (!esw->priv)
+			goto out;
+		if (rt3050_esw_has_carrier(esw->priv))
+			netif_carrier_on(esw->priv->netdev);
+		else
+			netif_carrier_off(esw->priv->netdev);
 	}
+
+out:
 	esw_w32(esw, status, RT305X_ESW_REG_ISR);
 
 	return IRQ_HANDLED;
@@ -1376,9 +1403,7 @@ static int esw_probe(struct platform_device *pdev)
 	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	struct device_node *np = pdev->dev.of_node;
 	const __be32 *port_map, *port_disable, *reg_init;
-	struct switch_dev *swdev;
 	struct rt305x_esw *esw;
-	int ret;
 
 	esw = devm_kzalloc(&pdev->dev, sizeof(*esw), GFP_KERNEL);
 	if (!esw)
@@ -1417,6 +1442,67 @@ static int esw_probe(struct platform_device *pdev)
 	if (IS_ERR(esw->rst_ephy))
 		esw->rst_ephy = NULL;
 
+	spin_lock_init(&esw->reg_rw_lock);
+	platform_set_drvdata(pdev, esw);
+
+	return 0;
+}
+
+static int esw_remove(struct platform_device *pdev)
+{
+	struct rt305x_esw *esw = platform_get_drvdata(pdev);
+
+	if (esw) {
+		esw_w32(esw, ~0, RT305X_ESW_REG_IMR);
+		platform_set_drvdata(pdev, NULL);
+	}
+
+	return 0;
+}
+
+static const struct of_device_id ralink_esw_match[] = {
+	{ .compatible = "ralink,rt3050-esw" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ralink_esw_match);
+
+/* called by the ethernet driver to bound with the switch driver */
+int rt3050_esw_init(struct fe_priv *priv)
+{
+	struct device_node *np = priv->switch_np;
+	struct platform_device *pdev = of_find_device_by_node(np);
+	struct switch_dev *swdev;
+	struct rt305x_esw *esw;
+	const __be32 *rgmii;
+	int ret;
+
+	if (!pdev)
+		return -ENODEV;
+
+	if (!of_device_is_compatible(np, ralink_esw_match->compatible))
+		return -EINVAL;
+
+	esw = platform_get_drvdata(pdev);
+	if (!esw)
+		return -EPROBE_DEFER;
+
+	priv->soc->swpriv = esw;
+	esw->priv = priv;
+
+	esw_hw_init(esw);
+
+	rgmii = of_get_property(np, "ralink,rgmii", NULL);
+	if (rgmii && be32_to_cpu(*rgmii) == 1) {
+		/*
+		 * External switch connected to RGMII interface.
+		 * Unregister the switch device after initialization.
+		 */
+		dev_err(&pdev->dev, "RGMII mode, not exporting switch device.\n");
+		unregister_switch(&esw->swdev);
+		platform_set_drvdata(pdev, NULL);
+		return -ENODEV;
+	}
+
 	swdev = &esw->swdev;
 	swdev->of_node = pdev->dev.of_node;
 	swdev->name = "rt305x-esw";
@@ -1432,53 +1518,19 @@ static int esw_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	platform_set_drvdata(pdev, esw);
-
-	spin_lock_init(&esw->reg_rw_lock);
-
-	esw_hw_init(esw);
-
-	reg_init = of_get_property(np, "ralink,rgmii", NULL);
-	if (reg_init && be32_to_cpu(*reg_init) == 1) {
-		/* 
-		 * External switch connected to RGMII interface. 
-		 * Unregister the switch device after initialization. 
-		 */
-		dev_err(&pdev->dev, "RGMII mode, not exporting switch device.\n");
-		unregister_switch(&esw->swdev);
-		platform_set_drvdata(pdev, NULL);
-		return -ENODEV;
-	}
-
 	ret = devm_request_irq(&pdev->dev, esw->irq, esw_interrupt, 0, "esw",
-			       esw);
-
+			esw);
 	if (!ret) {
 		esw_w32(esw, RT305X_ESW_PORT_ST_CHG, RT305X_ESW_REG_ISR);
 		esw_w32(esw, ~RT305X_ESW_PORT_ST_CHG, RT305X_ESW_REG_IMR);
 	}
 
-	return ret;
-}
-
-static int esw_remove(struct platform_device *pdev)
-{
-	struct rt305x_esw *esw = platform_get_drvdata(pdev);
-
-	if (esw) {
-		esw_w32(esw, ~0, RT305X_ESW_REG_IMR);
-		platform_set_drvdata(pdev, NULL);
-	}
+	dev_info(&pdev->dev, "mediatek esw at 0x%08lx, irq %d initialized\n",
+		   esw->base, esw->irq);
 
 	return 0;
 }
 
-static const struct of_device_id ralink_esw_match[] = {
-	{ .compatible = "ralink,rt3050-esw" },
-	{},
-};
-MODULE_DEVICE_TABLE(of, ralink_esw_match);
-
 static struct platform_driver esw_driver = {
 	.probe = esw_probe,
 	.remove = esw_remove,
diff --git a/target/linux/ramips/files/drivers/net/ethernet/ralink/esw_rt3050.h b/target/linux/ramips/files/drivers/net/ethernet/ralink/esw_rt3050.h
index bbc8fbd52a..c9650209cf 100644
--- a/target/linux/ramips/files/drivers/net/ethernet/ralink/esw_rt3050.h
+++ b/target/linux/ramips/files/drivers/net/ethernet/ralink/esw_rt3050.h
@@ -26,4 +26,7 @@ static inline int __init mtk_switch_init(void) { return 0; }
 static inline void mtk_switch_exit(void) { }
 
 #endif
+
+int rt3050_esw_init(struct fe_priv *priv);
+int rt3050_esw_has_carrier(struct fe_priv *priv);
 #endif
diff --git a/target/linux/ramips/files/drivers/net/ethernet/ralink/soc_rt3050.c b/target/linux/ramips/files/drivers/net/ethernet/ralink/soc_rt3050.c
index f98d7ec3da..435f007477 100644
--- a/target/linux/ramips/files/drivers/net/ethernet/ralink/soc_rt3050.c
+++ b/target/linux/ramips/files/drivers/net/ethernet/ralink/soc_rt3050.c
@@ -17,6 +17,7 @@
 #include <asm/mach-ralink/ralink_regs.h>
 
 #include "mtk_eth_soc.h"
+#include "esw_rt3050.h"
 #include "mdio_rt2880.h"
 
 static const u16 rt5350_reg_table[FE_REG_COUNT] = {
@@ -115,6 +116,7 @@ static void rt5350_tx_dma(struct fe_tx_dma *txd)
 static struct fe_soc_data rt3050_data = {
 	.init_data = rt305x_init_data,
 	.fwd_config = rt3050_fwd_config,
+	.switch_init = rt3050_esw_init,
 	.pdma_glo_cfg = FE_PDMA_SIZE_8DWORDS,
 	.checksum_bit = RX_DMA_L4VALID,
 	.rx_int = FE_RX_DONE_INT,
@@ -127,6 +129,7 @@ static struct fe_soc_data rt5350_data = {
 	.reg_table = rt5350_reg_table,
 	.set_mac = rt5350_set_mac,
 	.fwd_config = rt5350_fwd_config,
+	.switch_init = rt3050_esw_init,
 	.tx_dma = rt5350_tx_dma,
 	.pdma_glo_cfg = FE_PDMA_SIZE_8DWORDS,
 	.checksum_bit = RX_DMA_L4VALID,