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From:   Thomas Bogendoerfer <tsbogend@alpha.franken.de>
To:     "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Rob Herring <robh+dt@kernel.org>, netdev@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mips@vger.kernel.org
Subject: [PATCH v4 net-next 01/10] net: korina: Fix MDIO functions
Date:   Fri, 16 Apr 2021 10:47:02 +0200
Message-Id: <20210416084712.62561-2-tsbogend@alpha.franken.de>
In-Reply-To: <20210416084712.62561-1-tsbogend@alpha.franken.de>
References: <20210416084712.62561-1-tsbogend@alpha.franken.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Fixed MDIO functions to work reliable and not just by accident.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
 drivers/net/ethernet/Kconfig  |  1 +
 drivers/net/ethernet/korina.c | 56 +++++++++++++++++++++++------------
 2 files changed, 38 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index ad04660b97b8..c059b4bd3f23 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -98,6 +98,7 @@ config JME
 config KORINA
 	tristate "Korina (IDT RC32434) Ethernet support"
 	depends on MIKROTIK_RB532
+	select MII
 	help
 	  If you have a Mikrotik RouterBoard 500 or IDT RC32434
 	  based system say Y. Otherwise say N.
diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
index 925161959b9b..1b7e1c75ed9e 100644
--- a/drivers/net/ethernet/korina.c
+++ b/drivers/net/ethernet/korina.c
@@ -41,6 +41,7 @@
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
+#include <linux/iopoll.h>
 #include <linux/in.h>
 #include <linux/slab.h>
 #include <linux/string.h>
@@ -137,7 +138,6 @@ struct korina_private {
 	struct mii_if_info mii_if;
 	struct work_struct restart_task;
 	struct net_device *dev;
-	int phy_addr;
 };
 
 extern unsigned int idt_cpu_freq;
@@ -292,32 +292,48 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
 	return NETDEV_TX_OK;
 }
 
-static int mdio_read(struct net_device *dev, int mii_id, int reg)
+static int korina_mdio_wait(struct korina_private *lp)
+{
+	u32 value;
+
+	return readl_poll_timeout_atomic(&lp->eth_regs->miimind,
+					 value, value & ETH_MII_IND_BSY,
+					 1, 1000);
+}
+
+static int korina_mdio_read(struct net_device *dev, int phy, int reg)
 {
 	struct korina_private *lp = netdev_priv(dev);
 	int ret;
 
-	mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
+	ret = korina_mdio_wait(lp);
+	if (ret < 0)
+		return ret;
 
-	writel(0, &lp->eth_regs->miimcfg);
-	writel(0, &lp->eth_regs->miimcmd);
-	writel(mii_id | reg, &lp->eth_regs->miimaddr);
-	writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
+	writel(phy << 8 | reg, &lp->eth_regs->miimaddr);
+	writel(1, &lp->eth_regs->miimcmd);
 
-	ret = (int)(readl(&lp->eth_regs->miimrdd));
+	ret = korina_mdio_wait(lp);
+	if (ret < 0)
+		return ret;
+
+	if (readl(&lp->eth_regs->miimind) & ETH_MII_IND_NV)
+		return -EINVAL;
+
+	ret = readl(&lp->eth_regs->miimrdd);
+	writel(0, &lp->eth_regs->miimcmd);
 	return ret;
 }
 
-static void mdio_write(struct net_device *dev, int mii_id, int reg, int val)
+static void korina_mdio_write(struct net_device *dev, int phy, int reg, int val)
 {
 	struct korina_private *lp = netdev_priv(dev);
 
-	mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
+	if (korina_mdio_wait(lp))
+		return;
 
-	writel(0, &lp->eth_regs->miimcfg);
-	writel(1, &lp->eth_regs->miimcmd);
-	writel(mii_id | reg, &lp->eth_regs->miimaddr);
-	writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
+	writel(0, &lp->eth_regs->miimcmd);
+	writel(phy << 8 | reg, &lp->eth_regs->miimaddr);
 	writel(val, &lp->eth_regs->miimwtd);
 }
 
@@ -643,7 +659,7 @@ static void korina_check_media(struct net_device *dev, unsigned int init_media)
 {
 	struct korina_private *lp = netdev_priv(dev);
 
-	mii_check_media(&lp->mii_if, 0, init_media);
+	mii_check_media(&lp->mii_if, 1, init_media);
 
 	if (lp->mii_if.full_duplex)
 		writel(readl(&lp->eth_regs->ethmac2) | ETH_MAC2_FD,
@@ -869,12 +885,15 @@ static int korina_init(struct net_device *dev)
 	 * Clock independent setting */
 	writel(((idt_cpu_freq) / MII_CLOCK + 1) & ~1,
 			&lp->eth_regs->ethmcp);
+	writel(0, &lp->eth_regs->miimcfg);
 
 	/* don't transmit until fifo contains 48b */
 	writel(48, &lp->eth_regs->ethfifott);
 
 	writel(ETH_MAC1_RE, &lp->eth_regs->ethmac1);
 
+	korina_check_media(dev, 1);
+
 	napi_enable(&lp->napi);
 	netif_start_queue(dev);
 
@@ -1089,11 +1108,10 @@ static int korina_probe(struct platform_device *pdev)
 	dev->watchdog_timeo = TX_TIMEOUT;
 	netif_napi_add(dev, &lp->napi, korina_poll, NAPI_POLL_WEIGHT);
 
-	lp->phy_addr = (((lp->rx_irq == 0x2c? 1:0) << 8) | 0x05);
 	lp->mii_if.dev = dev;
-	lp->mii_if.mdio_read = mdio_read;
-	lp->mii_if.mdio_write = mdio_write;
-	lp->mii_if.phy_id = lp->phy_addr;
+	lp->mii_if.mdio_read = korina_mdio_read;
+	lp->mii_if.mdio_write = korina_mdio_write;
+	lp->mii_if.phy_id = 1;
 	lp->mii_if.phy_id_mask = 0x1f;
 	lp->mii_if.reg_num_mask = 0x1f;
 
-- 
2.29.2