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>

diff --git a/Documentation/devicetree/bindings/net/fsl-fec.txt b/Documentation/devicetree/bindings/net/fsl-fec.txt
new file mode 100644 (file)
index 0000000..de43951
--- /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 ed137bb..e8266cc 100644 (file)
--- 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,