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/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c
index 6dfc26d..52deec0 100644
--- 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 @@
#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 @@
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 @@
}
/* 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 @@
}
/* 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 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 @@
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 @@
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 @@
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 @@
}
#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 @@
#endif
.driver = {
.name = MODNAME,
+ .of_match_table = of_match_ptr(lpc_eth_match),
},
};