net/fec: add device tree probe support

It adds device tree probe support for fec driver.

Signed-off-by: Jason Liu <jason.hui@linaro.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: David S. Miller <davem@davemloft.net>

2 files changed, 122 insertions, 5 deletions

diff --git a/Documentation/devicetree/bindings/net/fsl-fec.txt b/Documentation/devicetree/bindings/net/fsl-fec.txt
new file mode 100644
index 000000000000..de439517dff0
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/fsl-fec.txt
@@ -0,0 +1,24 @@
+* Freescale Fast Ethernet Controller (FEC)
+
+Required properties:
+- compatible : Should be "fsl,<soc>-fec"
+- reg : Address and length of the register set for the device
+- interrupts : Should contain fec interrupt
+- phy-mode : String, operation mode of the PHY interface.
+  Supported values are: "mii", "gmii", "sgmii", "tbi", "rmii",
+  "rgmii", "rgmii-id", "rgmii-rxid", "rgmii-txid", "rtbi", "smii".
+- phy-reset-gpios : Should specify the gpio for phy reset
+
+Optional properties:
+- local-mac-address : 6 bytes, mac address
+
+Example:
+
+fec@83fec000 {
+        compatible = "fsl,imx51-fec", "fsl,imx27-fec";
+        reg = <0x83fec000 0x4000>;
+        interrupts = <87>;
+        phy-mode = "mii";
+        phy-reset-gpios = <&gpio1 14 0>; /* GPIO2_14 */
+        local-mac-address = [00 04 9F 01 1B B9];
+};
diff --git a/drivers/net/fec.c b/drivers/net/fec.c
index ed137bbbcf61..e8266ccf818a 100644
--- a/drivers/net/fec.c
+++ b/drivers/net/fec.c
@@ -44,6 +44,10 @@
 #include <linux/platform_device.h>
 #include <linux/phy.h>
 #include <linux/fec.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_net.h>
 
 #include <asm/cacheflush.h>
 
@@ -89,6 +93,20 @@ static struct platform_device_id fec_devtype[] = {
 };
 MODULE_DEVICE_TABLE(platform, fec_devtype);
 
+enum imx_fec_type {
+        IMX25_FEC = 1,  /* runs on i.mx25/50/53 */
+        IMX27_FEC,      /* runs on i.mx27/35/51 */
+        IMX28_FEC,
+};
+
+static const struct of_device_id fec_dt_ids[] = {
+        { .compatible = "fsl,imx25-fec", .data = &fec_devtype[IMX25_FEC], },
+        { .compatible = "fsl,imx27-fec", .data = &fec_devtype[IMX27_FEC], },
+        { .compatible = "fsl,imx28-fec", .data = &fec_devtype[IMX28_FEC], },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, fec_dt_ids);
+
 static unsigned char macaddr[ETH_ALEN];
 module_param_array(macaddr, byte, NULL, 0);
 MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
@@ -748,8 +766,22 @@ static void __inline__ fec_get_mac(struct net_device *ndev)
          */
         iap = macaddr;
 
+#ifdef CONFIG_OF
+        /*
+         * 2) from device tree data
+         */
+        if (!is_valid_ether_addr(iap)) {
+                struct device_node *np = fep->pdev->dev.of_node;
+                if (np) {
+                        const char *mac = of_get_mac_address(np);
+                        if (mac)
+                                iap = (unsigned char *) mac;
+                }
+        }
+#endif
+
         /*
-         * 2) from flash or fuse (via platform data)
+         * 3) from flash or fuse (via platform data)
          */
         if (!is_valid_ether_addr(iap)) {
 #ifdef CONFIG_M5272
@@ -762,7 +794,7 @@ static void __inline__ fec_get_mac(struct net_device *ndev)
         }
 
         /*
-         * 3) FEC mac registers set by bootloader
+         * 4) FEC mac registers set by bootloader
          */
         if (!is_valid_ether_addr(iap)) {
                 *((unsigned long *) &tmpaddr[0]) =
@@ -1368,6 +1400,52 @@ static int fec_enet_init(struct net_device *ndev)
         return 0;
 }
 
+#ifdef CONFIG_OF
+static int __devinit fec_get_phy_mode_dt(struct platform_device *pdev)
+{
+        struct device_node *np = pdev->dev.of_node;
+
+        if (np)
+                return of_get_phy_mode(np);
+
+        return -ENODEV;
+}
+
+static int __devinit fec_reset_phy(struct platform_device *pdev)
+{
+        int err, phy_reset;
+        struct device_node *np = pdev->dev.of_node;
+
+        if (!np)
+                return -ENODEV;
+
+        phy_reset = of_get_named_gpio(np, "phy-reset-gpios", 0);
+        err = gpio_request_one(phy_reset, GPIOF_OUT_INIT_LOW, "phy-reset");
+        if (err) {
+                pr_warn("FEC: failed to get gpio phy-reset: %d\n", err);
+                return err;
+        }
+        msleep(1);
+        gpio_set_value(phy_reset, 1);
+
+        return 0;
+}
+#else /* CONFIG_OF */
+static inline int fec_get_phy_mode_dt(struct platform_device *pdev)
+{
+        return -ENODEV;
+}
+
+static inline int fec_reset_phy(struct platform_device *pdev)
+{
+        /*
+         * In case of platform probe, the reset has been done
+         * by machine code.
+         */
+        return 0;
+}
+#endif /* CONFIG_OF */
+
 static int __devinit
 fec_probe(struct platform_device *pdev)
 {
@@ -1376,6 +1454,11 @@ fec_probe(struct platform_device *pdev)
         struct net_device *ndev;
         int i, irq, ret = 0;
         struct resource *r;
+        const struct of_device_id *of_id;
+
+        of_id = of_match_device(fec_dt_ids, &pdev->dev);
+        if (of_id)
+                pdev->id_entry = of_id->data;
 
         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         if (!r)
@@ -1407,9 +1490,18 @@ fec_probe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, ndev);
 
-        pdata = pdev->dev.platform_data;
-        if (pdata)
-                fep->phy_interface = pdata->phy;
+        ret = fec_get_phy_mode_dt(pdev);
+        if (ret < 0) {
+                pdata = pdev->dev.platform_data;
+                if (pdata)
+                        fep->phy_interface = pdata->phy;
+                else
+                        fep->phy_interface = PHY_INTERFACE_MODE_MII;
+        } else {
+                fep->phy_interface = ret;
+        }
+
+        fec_reset_phy(pdev);
 
         /* This device has up to three irqs on some platforms */
         for (i = 0; i < 3; i++) {
@@ -1544,6 +1636,7 @@ static struct platform_driver fec_driver = {
 #ifdef CONFIG_PM
                 .pm     = &fec_pm_ops,
 #endif
+                .of_match_table = fec_dt_ids,
         },
         .id_table = fec_devtype,
         .probe  = fec_probe,