[net-next,PATCH 3/4] net: mdio-ipq4019: add Clause 45 support
From: Robert Marko
Date: Thu Jul 02 2020 - 06:30:38 EST
While up-streaming the IPQ4019 driver it was thought that the controller had no Clause 45 support,
but it actually does and its activated by writing a bit to the mode register.
So lets add it as newer SoC-s use the same controller and Clause 45 compliant PHY-s.
Signed-off-by: Robert Marko <robert.marko@xxxxxxxxxx>
---
drivers/net/phy/mdio-ipq4019.c | 109 ++++++++++++++++++++++++++++-----
1 file changed, 92 insertions(+), 17 deletions(-)
diff --git a/drivers/net/phy/mdio-ipq4019.c b/drivers/net/phy/mdio-ipq4019.c
index 7660bf006da0..9143113d5a6b 100644
--- a/drivers/net/phy/mdio-ipq4019.c
+++ b/drivers/net/phy/mdio-ipq4019.c
@@ -13,6 +13,7 @@
#include <linux/phy.h>
#include <linux/platform_device.h>
+#define MDIO_MODE_REG 0x40
#define MDIO_ADDR_REG 0x44
#define MDIO_DATA_WRITE_REG 0x48
#define MDIO_DATA_READ_REG 0x4c
@@ -21,6 +22,12 @@
#define MDIO_CMD_ACCESS_START BIT(8)
#define MDIO_CMD_ACCESS_CODE_READ 0
#define MDIO_CMD_ACCESS_CODE_WRITE 1
+#define MDIO_CMD_ACCESS_CODE_C45_ADDR 0
+#define MDIO_CMD_ACCESS_CODE_C45_WRITE 1
+#define MDIO_CMD_ACCESS_CODE_C45_READ 2
+
+/* 0 = Clause 22, 1 = Clause 45 */
+#define MDIO_MODE_BIT BIT(8)
#define IPQ4019_MDIO_TIMEOUT 10000
#define IPQ4019_MDIO_SLEEP 10
@@ -39,7 +46,7 @@ static int ipq4019_mdio_wait_busy(struct mii_bus *bus)
unsigned int busy;
return readl_poll_timeout(priv->membase + MDIO_CMD_REG, busy,
- (busy & MDIO_CMD_ACCESS_BUSY) == 0,
+ (busy & MDIO_CMD_ACCESS_BUSY) == 0,
IPQ4019_MDIO_SLEEP, IPQ4019_MDIO_TIMEOUT);
}
@@ -47,18 +54,43 @@ static int ipq4019_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
{
struct ipq4019_mdio_data *priv = bus->priv;
unsigned int cmd;
-
- /* Reject clause 45 */
- if (regnum & MII_ADDR_C45)
- return -EOPNOTSUPP;
+ unsigned int data;
if (ipq4019_mdio_wait_busy(bus))
return -ETIMEDOUT;
- /* issue the phy address and reg */
- writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
+ /* Clause 45 support */
+ if (regnum & MII_ADDR_C45) {
+ unsigned int mmd = (regnum >> 16) & 0x1F;
+ unsigned int reg = regnum & 0xFFFF;
+
+ /* Enter Clause 45 mode */
+ data = readl(priv->membase + MDIO_MODE_REG);
+
+ data |= MDIO_MODE_BIT;
+
+ writel(data, priv->membase + MDIO_MODE_REG);
+
+ /* issue the phy address and mmd */
+ writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
+
+ /* issue reg */
+ writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
+
+ cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
+ } else {
+ /* Enter Clause 22 mode */
+ data = readl(priv->membase + MDIO_MODE_REG);
- cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_READ;
+ data &= ~MDIO_MODE_BIT;
+
+ writel(data, priv->membase + MDIO_MODE_REG);
+
+ /* issue the phy address and reg */
+ writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
+
+ cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_READ;
+ }
/* issue read command */
writel(cmd, priv->membase + MDIO_CMD_REG);
@@ -67,6 +99,15 @@ static int ipq4019_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
if (ipq4019_mdio_wait_busy(bus))
return -ETIMEDOUT;
+ if (regnum & MII_ADDR_C45) {
+ cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_READ;
+
+ writel(cmd, priv->membase + MDIO_CMD_REG);
+
+ if (ipq4019_mdio_wait_busy(bus))
+ return -ETIMEDOUT;
+ }
+
/* Read and return data */
return readl(priv->membase + MDIO_DATA_READ_REG);
}
@@ -76,22 +117,56 @@ static int ipq4019_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
{
struct ipq4019_mdio_data *priv = bus->priv;
unsigned int cmd;
-
- /* Reject clause 45 */
- if (regnum & MII_ADDR_C45)
- return -EOPNOTSUPP;
+ unsigned int data;
if (ipq4019_mdio_wait_busy(bus))
return -ETIMEDOUT;
- /* issue the phy address and reg */
- writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
+ /* Clause 45 support */
+ if (regnum & MII_ADDR_C45) {
+ unsigned int mmd = (regnum >> 16) & 0x1F;
+ unsigned int reg = regnum & 0xFFFF;
+
+ /* Enter Clause 45 mode */
+ data = readl(priv->membase + MDIO_MODE_REG);
+
+ data |= MDIO_MODE_BIT;
+
+ writel(data, priv->membase + MDIO_MODE_REG);
+
+ /* issue the phy address and mmd */
+ writel((mii_id << 8) | mmd, priv->membase + MDIO_ADDR_REG);
+
+ /* issue reg */
+ writel(reg, priv->membase + MDIO_DATA_WRITE_REG);
+
+ cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_ADDR;
+
+ writel(cmd, priv->membase + MDIO_CMD_REG);
+
+ if (ipq4019_mdio_wait_busy(bus))
+ return -ETIMEDOUT;
+ } else {
+ /* Enter Clause 22 mode */
+ data = readl(priv->membase + MDIO_MODE_REG);
+
+ data &= ~MDIO_MODE_BIT;
+
+ writel(data, priv->membase + MDIO_MODE_REG);
+
+ /* issue the phy address and reg */
+ writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG);
+ }
/* issue write data */
writel(value, priv->membase + MDIO_DATA_WRITE_REG);
-
- cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_WRITE;
+
/* issue write command */
+ if (regnum & MII_ADDR_C45)
+ cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_C45_WRITE;
+ else
+ cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_WRITE;
+
writel(cmd, priv->membase + MDIO_CMD_REG);
/* Wait write complete */
@@ -105,7 +180,7 @@ static int ipq4019_mdio_probe(struct platform_device *pdev)
{
struct ipq4019_mdio_data *priv;
struct mii_bus *bus;
- struct device_node *np = pdev->dev.of_node;
+ struct device_node *np = pdev->dev.of_node;
int ret;
bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*priv));
--
2.26.2