net: Add device tree support to LPC32xx

This patch adds device tree support for lpc_eth.c.

The runtime option for MII/RMII is solved via the "phy-mode" property, SRAM
("IRAM") usage for DMA can be chosen via "use-iram".

Signed-off-by: Roland Stigge <stigge@antcom.de>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/devicetree/bindings/net/lpc-eth.txt b/Documentation/devicetree/bindings/net/lpc-eth.txt
new file mode 100644 (file)
index 0000000..585021a
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/lpc-eth.txt
@@ -0,0 +1,24 @@
+* NXP LPC32xx SoC Ethernet Controller
+
+Required properties:
+- compatible: Should be "nxp,lpc-eth"
+- reg: Address and length of the register set for the device
+- interrupts: Should contain ethernet controller interrupt
+
+Optional properties:
+- phy-mode: String, operation mode of the PHY interface.
+  Supported values are: "mii", "rmii" (default)
+- use-iram: Use LPC32xx internal SRAM (IRAM) for DMA buffering
+- local-mac-address : 6 bytes, mac address
+
+Example:
+
+       mac: ethernet@31060000 {
+               compatible = "nxp,lpc-eth";
+               reg = <0x31060000 0x1000>;
+               interrupt-parent = <&mic>;
+               interrupts = <29 0>;
+
+               phy-mode = "rmii";
+               use-iram;
+       };

diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c
index 6dfc26d85e4747bb645d577da44d8840a998405d..52deec0b22ea09e76002171a5b9d349c71f5ff44 100644 (file)
--- a/drivers/net/ethernet/nxp/lpc_eth.c
+++ b/drivers/net/ethernet/nxp/lpc_eth.c
@@ -40,6 +40,7 @@
 #include <linux/skbuff.h>
 #include <linux/phy.h>
 #include <linux/dma-mapping.h>
+#include <linux/of.h>
 #include <linux/of_net.h>
 #include <linux/types.h>
 
@@ -340,13 +341,17 @@
  */
 #define LPC_POWERDOWN_MACAHB                   (1 << 31)
 
-/* Upon the upcoming introduction of device tree usage in LPC32xx,
- * lpc_phy_interface_mode() and use_iram_for_net() will be extended with a
- * device parameter for access to device tree information at runtime, instead
- * of defining the values at compile time
- */
-static inline phy_interface_t lpc_phy_interface_mode(void)
+static phy_interface_t lpc_phy_interface_mode(struct device *dev)
 {
+       if (dev && dev->of_node) {
+               const char *mode = of_get_property(dev->of_node,
+                                                  "phy-mode", NULL);
+               if (mode && !strcmp(mode, "mii"))
+                       return PHY_INTERFACE_MODE_MII;
+               return PHY_INTERFACE_MODE_RMII;
+       }
+
+       /* non-DT */
 #ifdef CONFIG_ARCH_LPC32XX_MII_SUPPORT
        return PHY_INTERFACE_MODE_MII;
 #else
@@ -354,12 +359,16 @@ static inline phy_interface_t lpc_phy_interface_mode(void)
 #endif
 }
 
-static inline int use_iram_for_net(void)
+static bool use_iram_for_net(struct device *dev)
 {
+       if (dev && dev->of_node)
+               return of_property_read_bool(dev->of_node, "use-iram");
+
+       /* non-DT */
 #ifdef CONFIG_ARCH_LPC32XX_IRAM_FOR_NET
-       return 1;
+       return true;
 #else
-       return 0;
+       return false;
 #endif
 }
 
@@ -664,7 +673,7 @@ static void __lpc_eth_init(struct netdata_local *pldat)
               LPC_ENET_CLRT(pldat->net_base));
        writel(LPC_IPGR_LOAD_PART2(0x12), LPC_ENET_IPGR(pldat->net_base));
 
-       if (lpc_phy_interface_mode() == PHY_INTERFACE_MODE_MII)
+       if (lpc_phy_interface_mode(&pldat->pdev->dev) == PHY_INTERFACE_MODE_MII)
                writel(LPC_COMMAND_PASSRUNTFRAME,
                       LPC_ENET_COMMAND(pldat->net_base));
        else {
@@ -804,12 +813,13 @@ static int lpc_mii_probe(struct net_device *ndev)
        }
 
        /* Attach to the PHY */
-       if (lpc_phy_interface_mode() == PHY_INTERFACE_MODE_MII)
+       if (lpc_phy_interface_mode(&pldat->pdev->dev) == PHY_INTERFACE_MODE_MII)
                netdev_info(ndev, "using MII interface\n");
        else
                netdev_info(ndev, "using RMII interface\n");
        phydev = phy_connect(ndev, dev_name(&phydev->dev),
-               &lpc_handle_link_change, 0, lpc_phy_interface_mode());
+                            &lpc_handle_link_change, 0,
+                            lpc_phy_interface_mode(&pldat->pdev->dev));
 
        if (IS_ERR(phydev)) {
                netdev_err(ndev, "Could not attach to PHY\n");
@@ -843,7 +853,7 @@ static int lpc_mii_init(struct netdata_local *pldat)
        }
 
        /* Setup MII mode */
-       if (lpc_phy_interface_mode() == PHY_INTERFACE_MODE_MII)
+       if (lpc_phy_interface_mode(&pldat->pdev->dev) == PHY_INTERFACE_MODE_MII)
                writel(LPC_COMMAND_PASSRUNTFRAME,
                       LPC_ENET_COMMAND(pldat->net_base));
        else {
@@ -1315,18 +1325,26 @@ static const struct net_device_ops lpc_netdev_ops = {
 static int lpc_eth_drv_probe(struct platform_device *pdev)
 {
        struct resource *res;
-       struct resource *dma_res;
        struct net_device *ndev;
        struct netdata_local *pldat;
        struct phy_device *phydev;
        dma_addr_t dma_handle;
        int irq, ret;
+       u32 tmp;
+
+       /* Setup network interface for RMII or MII mode */
+       tmp = __raw_readl(LPC32XX_CLKPWR_MACCLK_CTRL);
+       tmp &= ~LPC32XX_CLKPWR_MACCTRL_PINS_MSK;
+       if (lpc_phy_interface_mode(&pdev->dev) == PHY_INTERFACE_MODE_MII)
+               tmp |= LPC32XX_CLKPWR_MACCTRL_USE_MII_PINS;
+       else
+               tmp |= LPC32XX_CLKPWR_MACCTRL_USE_RMII_PINS;
+       __raw_writel(tmp, LPC32XX_CLKPWR_MACCLK_CTRL);
 
        /* Get platform resources */
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-       dma_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
        irq = platform_get_irq(pdev, 0);
-       if ((!res) || (!dma_res) || (irq < 0) || (irq >= NR_IRQS)) {
+       if ((!res) || (irq < 0) || (irq >= NR_IRQS)) {
                dev_err(&pdev->dev, "error getting resources.\n");
                ret = -ENXIO;
                goto err_exit;
@@ -1389,17 +1407,19 @@ static int lpc_eth_drv_probe(struct platform_device *pdev)
                sizeof(struct txrx_desc_t) + sizeof(struct rx_status_t));
        pldat->dma_buff_base_v = 0;
 
-       if (use_iram_for_net()) {
-               dma_handle = dma_res->start;
+       if (use_iram_for_net(&pldat->pdev->dev)) {
+               dma_handle = LPC32XX_IRAM_BASE;
                if (pldat->dma_buff_size <= lpc32xx_return_iram_size())
                        pldat->dma_buff_base_v =
-                               io_p2v(dma_res->start);
+                               io_p2v(LPC32XX_IRAM_BASE);
                else
                        netdev_err(ndev,
                                "IRAM not big enough for net buffers, using SDRAM instead.\n");
        }
 
        if (pldat->dma_buff_base_v == 0) {
+               pldat->pdev->dev.coherent_dma_mask = 0xFFFFFFFF;
+               pldat->pdev->dev.dma_mask = &pldat->pdev->dev.coherent_dma_mask;
                pldat->dma_buff_size = PAGE_ALIGN(pldat->dma_buff_size);
 
                /* Allocate a chunk of memory for the DMA ethernet buffers
@@ -1488,7 +1508,7 @@ err_out_unregister_netdev:
        platform_set_drvdata(pdev, NULL);
        unregister_netdev(ndev);
 err_out_dma_unmap:
-       if (!use_iram_for_net() ||
+       if (!use_iram_for_net(&pldat->pdev->dev) ||
            pldat->dma_buff_size > lpc32xx_return_iram_size())
                dma_free_coherent(&pldat->pdev->dev, pldat->dma_buff_size,
                                  pldat->dma_buff_base_v,
@@ -1515,7 +1535,7 @@ static int lpc_eth_drv_remove(struct platform_device *pdev)
        unregister_netdev(ndev);
        platform_set_drvdata(pdev, NULL);
 
-       if (!use_iram_for_net() ||
+       if (!use_iram_for_net(&pldat->pdev->dev) ||
            pldat->dma_buff_size > lpc32xx_return_iram_size())
                dma_free_coherent(&pldat->pdev->dev, pldat->dma_buff_size,
                                  pldat->dma_buff_base_v,
@@ -1584,6 +1604,14 @@ static int lpc_eth_drv_resume(struct platform_device *pdev)
 }
 #endif
 
+#ifdef CONFIG_OF
+static const struct of_device_id lpc_eth_match[] = {
+       { .compatible = "nxp,lpc-eth" },
+       { }
+};
+MODULE_DEVICE_TABLE(of, lpc_eth_match);
+#endif
+
 static struct platform_driver lpc_eth_driver = {
        .probe          = lpc_eth_drv_probe,
        .remove         = __devexit_p(lpc_eth_drv_remove),
@@ -1593,6 +1621,7 @@ static struct platform_driver lpc_eth_driver = {
 #endif
        .driver         = {
                .name   = MODNAME,
+               .of_match_table = of_match_ptr(lpc_eth_match),
        },
 };