kernel: rtl8366-smi: add Realtek switch management via mii-bus

Current version of rtl8366-smi module only supports Realtek switch
managment via two gpio lines. This adds Realtek switch
management via mii_bus. Tested on a Tp-link Archer C2 v1 (Mediatek
SoC mt7620a based)

dts-file configuration should look like this:

rtl8367rb {
	compatible = "realtek,rtl8367b";
	realtek,extif1 = <1 0 1 1 1 1 1 1 2>;
	mii-bus = <&mdio0>;
};

&ethernet {
	status = "okay";
	mtd-mac-address = <&rom 0xf100>;
	pinctrl-names = "default";
	pinctrl-0 = <&rgmii1_pins &rgmii2_pins &mdio_pins>;

	port@5 {
		status = "okay";
		mediatek,fixed-link = <1000 1 1 1>;
		phy-mode = "rgmii";
	};

	mdio0: mdio-bus {
		status = "okay";
	};
};

Signed-off-by: Serge Vasilugin <vasilugin@yandex.ru>
Signed-off-by: Franz Flasch <franz.flasch@gmx.at>
(backported from d4ac26ec4920036fe15414e47a0f1a3df6e8b9fb)

diff --git a/target/linux/generic/files/drivers/net/phy/rtl8366_smi.c b/target/linux/generic/files/drivers/net/phy/rtl8366_smi.c
index 00ad68e0bc5eb6236b419571d44b61e5f0b70f14..c0cb680e23ba31299a828ab1b9a38599de6db867 100644 (file)
--- a/target/linux/generic/files/drivers/net/phy/rtl8366_smi.c
+++ b/target/linux/generic/files/drivers/net/phy/rtl8366_smi.c
@@ -199,7 +199,7 @@ static int rtl8366_smi_read_byte1(struct rtl8366_smi *smi, u8 *data)
        return 0;
 }
 
-int rtl8366_smi_read_reg(struct rtl8366_smi *smi, u32 addr, u32 *data)
+static int __rtl8366_smi_read_reg(struct rtl8366_smi *smi, u32 addr, u32 *data)
 {
        unsigned long flags;
        u8 lo = 0;
@@ -240,6 +240,101 @@ int rtl8366_smi_read_reg(struct rtl8366_smi *smi, u32 addr, u32 *data)
 
        return ret;
 }
+/* Read/write via mdiobus */
+#define MDC_MDIO_CTRL0_REG             31
+#define MDC_MDIO_START_REG             29
+#define MDC_MDIO_CTRL1_REG             21
+#define MDC_MDIO_ADDRESS_REG           23
+#define MDC_MDIO_DATA_WRITE_REG                24
+#define MDC_MDIO_DATA_READ_REG         25
+
+#define MDC_MDIO_START_OP              0xFFFF
+#define MDC_MDIO_ADDR_OP               0x000E
+#define MDC_MDIO_READ_OP               0x0001
+#define MDC_MDIO_WRITE_OP              0x0003
+#define MDC_REALTEK_PHY_ADDR           0x0
+
+int __rtl8366_mdio_read_reg(struct rtl8366_smi *smi, u32 addr, u32 *data)
+{
+       u32 phy_id = MDC_REALTEK_PHY_ADDR;
+       struct mii_bus *mbus = smi->ext_mbus;
+
+       BUG_ON(in_interrupt());
+
+       mutex_lock(&mbus->mdio_lock);
+       /* Write Start command to register 29 */
+       mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
+
+       /* Write address control code to register 31 */
+       mbus->write(mbus, phy_id, MDC_MDIO_CTRL0_REG, MDC_MDIO_ADDR_OP);
+
+       /* Write Start command to register 29 */
+       mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
+
+       /* Write address to register 23 */
+       mbus->write(mbus, phy_id, MDC_MDIO_ADDRESS_REG, addr);
+
+       /* Write Start command to register 29 */
+       mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
+
+       /* Write read control code to register 21 */
+       mbus->write(mbus, phy_id, MDC_MDIO_CTRL1_REG, MDC_MDIO_READ_OP);
+
+       /* Write Start command to register 29 */
+       mbus->write(smi->ext_mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
+
+       /* Read data from register 25 */
+       *data = mbus->read(mbus, phy_id, MDC_MDIO_DATA_READ_REG);
+
+       mutex_unlock(&mbus->mdio_lock);
+
+       return 0;
+}
+
+static int __rtl8366_mdio_write_reg(struct rtl8366_smi *smi, u32 addr, u32 data)
+{
+       u32 phy_id = MDC_REALTEK_PHY_ADDR;
+       struct mii_bus *mbus = smi->ext_mbus;
+
+       BUG_ON(in_interrupt());
+
+       mutex_lock(&mbus->mdio_lock);
+
+       /* Write Start command to register 29 */
+       mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
+
+       /* Write address control code to register 31 */
+       mbus->write(mbus, phy_id, MDC_MDIO_CTRL0_REG, MDC_MDIO_ADDR_OP);
+
+       /* Write Start command to register 29 */
+       mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
+
+       /* Write address to register 23 */
+       mbus->write(mbus, phy_id, MDC_MDIO_ADDRESS_REG, addr);
+
+       /* Write Start command to register 29 */
+       mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
+
+       /* Write data to register 24 */
+       mbus->write(mbus, phy_id, MDC_MDIO_DATA_WRITE_REG, data);
+
+       /* Write Start command to register 29 */
+       mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
+
+       /* Write data control code to register 21 */
+       mbus->write(mbus, phy_id, MDC_MDIO_CTRL1_REG, MDC_MDIO_WRITE_OP);
+
+       mutex_unlock(&mbus->mdio_lock);
+       return 0;
+}
+
+int rtl8366_smi_read_reg(struct rtl8366_smi *smi, u32 addr, u32 *data)
+{
+       if (smi->ext_mbus)
+               return __rtl8366_mdio_read_reg(smi, addr, data);
+       else
+               return __rtl8366_smi_read_reg(smi, addr, data);
+}
 EXPORT_SYMBOL_GPL(rtl8366_smi_read_reg);
 
 static int __rtl8366_smi_write_reg(struct rtl8366_smi *smi,
@@ -291,7 +386,10 @@ static int __rtl8366_smi_write_reg(struct rtl8366_smi *smi,
 
 int rtl8366_smi_write_reg(struct rtl8366_smi *smi, u32 addr, u32 data)
 {
-       return __rtl8366_smi_write_reg(smi, addr, data, true);
+       if (smi->ext_mbus)
+               return __rtl8366_mdio_write_reg(smi, addr, data);
+       else
+               return __rtl8366_smi_write_reg(smi, addr, data, true);
 }
 EXPORT_SYMBOL_GPL(rtl8366_smi_write_reg);
 
@@ -1282,18 +1380,20 @@ static int __rtl8366_smi_init(struct rtl8366_smi *smi, const char *name)
 {
        int err;
 
-       err = gpio_request(smi->gpio_sda, name);
-       if (err) {
-               printk(KERN_ERR "rtl8366_smi: gpio_request failed for %u, err=%d\n",
-                       smi->gpio_sda, err);
-               goto err_out;
-       }
+       if (!smi->ext_mbus) {
+               err = gpio_request(smi->gpio_sda, name);
+               if (err) {
+                       printk(KERN_ERR "rtl8366_smi: gpio_request failed for %u, err=%d\n",
+                               smi->gpio_sda, err);
+                       goto err_out;
+               }
 
-       err = gpio_request(smi->gpio_sck, name);
-       if (err) {
-               printk(KERN_ERR "rtl8366_smi: gpio_request failed for %u, err=%d\n",
-                       smi->gpio_sck, err);
-               goto err_free_sda;
+               err = gpio_request(smi->gpio_sck, name);
+               if (err) {
+                       printk(KERN_ERR "rtl8366_smi: gpio_request failed for %u, err=%d\n",
+                               smi->gpio_sck, err);
+                       goto err_free_sda;
+               }
        }
 
        spin_lock_init(&smi->lock);
@@ -1317,8 +1417,10 @@ static void __rtl8366_smi_cleanup(struct rtl8366_smi *smi)
        if (smi->hw_reset)
                smi->hw_reset(smi, true);
 
-       gpio_free(smi->gpio_sck);
-       gpio_free(smi->gpio_sda);
+       if (!smi->ext_mbus) {
+               gpio_free(smi->gpio_sck);
+               gpio_free(smi->gpio_sda);
+       }
 }
 
 enum rtl8366_type rtl8366_smi_detect(struct rtl8366_platform_data *pdata)
@@ -1371,8 +1473,11 @@ int rtl8366_smi_init(struct rtl8366_smi *smi)
        if (err)
                goto err_out;
 
-       dev_info(smi->parent, "using GPIO pins %u (SDA) and %u (SCK)\n",
-                smi->gpio_sda, smi->gpio_sck);
+       if (!smi->ext_mbus)
+               dev_info(smi->parent, "using GPIO pins %u (SDA) and %u (SCK)\n",
+                        smi->gpio_sda, smi->gpio_sck);
+       else
+               dev_info(smi->parent, "using MDIO bus '%s'\n", smi->ext_mbus->name);
 
        err = smi->ops->detect(smi);
        if (err) {
@@ -1437,7 +1542,25 @@ int rtl8366_smi_probe_of(struct platform_device *pdev, struct rtl8366_smi *smi)
 {
        int sck = of_get_named_gpio(pdev->dev.of_node, "gpio-sck", 0);
        int sda = of_get_named_gpio(pdev->dev.of_node, "gpio-sda", 0);
+       struct device_node *np = pdev->dev.of_node;
+       struct device_node *mdio_node;
+
+       mdio_node = of_parse_phandle(np, "mii-bus", 0);
+       if (!mdio_node) {
+               dev_err(&pdev->dev, "cannot find mdio node phandle");
+               goto try_gpio;
+       }
+
+       smi->ext_mbus = of_mdio_find_bus(mdio_node);
+       if (!smi->ext_mbus) {
+               dev_err(&pdev->dev,
+                       "cannot find mdio bus from bus handle");
+               goto try_gpio;
+       }
+
+       return 0;
 
+try_gpio:
        if (!gpio_is_valid(sck) || !gpio_is_valid(sda)) {
                dev_err(&pdev->dev, "gpios missing in devictree\n");
                return -EINVAL;

diff --git a/target/linux/generic/files/drivers/net/phy/rtl8366_smi.h b/target/linux/generic/files/drivers/net/phy/rtl8366_smi.h
index e5f34bf9cfdc0ae603ec9627592ff32bbc77a610..d1d988a3727b7a6629bfea0d20f715e0346f2396 100644 (file)
--- a/target/linux/generic/files/drivers/net/phy/rtl8366_smi.h
+++ b/target/linux/generic/files/drivers/net/phy/rtl8366_smi.h
@@ -63,6 +63,7 @@ struct rtl8366_smi {
        u16                     dbg_reg;
        u8                      dbg_vlan_4k_page;
 #endif
+       struct mii_bus          *ext_mbus;
 };
 
 struct rtl8366_vlan_mc {