[PATCH v5 net-next 01/10] net: korina: Fix MDIO functions

Thomas Bogendoerfer
2021-04-16T08:52:20Z

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