dm: net: Adjust designware driver to support driver model

Add driver model support to the designware driver. This reuses most of the
existing code except for some duplication in the probe() method.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

drivers/net/designware.c

@@ -10,6 +10,7 @@
  */
 
 #include <common.h>
+#include <dm.h>
 #include <errno.h>
 #include <miiphy.h>
 #include <malloc.h>
@@ -18,6 +19,8 @@
 #include <asm/io.h>
 #include "designware.h"
 
+DECLARE_GLOBAL_DATA_PTR;
+
 #if !defined(CONFIG_PHYLIB)
 # error "DesignWare Ether MAC requires PHYLIB - missing CONFIG_PHYLIB"
 #endif
@@ -343,11 +346,11 @@ static int _dw_eth_send(struct dw_eth_dev *priv, void *packet, int length)
 	return 0;
 }
 
-static int _dw_eth_recv(struct dw_eth_dev *priv)
+static int _dw_eth_recv(struct dw_eth_dev *priv, uchar **packetp)
 {
 	u32 status, desc_num = priv->rx_currdescnum;
 	struct dmamacdescr *desc_p = &priv->rx_mac_descrtable[desc_num];
-	int length = 0;
+	int length = -EAGAIN;
 	uint32_t desc_start = (uint32_t)desc_p;
 	uint32_t desc_end = desc_start +
 		roundup(sizeof(*desc_p), ARCH_DMA_MINALIGN);
@@ -368,26 +371,35 @@ static int _dw_eth_recv(struct dw_eth_dev *priv)
 		/* Invalidate received data */
 		data_end = data_start + roundup(length, ARCH_DMA_MINALIGN);
 		invalidate_dcache_range(data_start, data_end);
+		*packetp = desc_p->dmamac_addr;
+	}
 
-		net_process_received_packet(desc_p->dmamac_addr, length);
+	return length;
+}
 
-		/*
-		 * Make the current descriptor valid again and go to
-		 * the next one
-		 */
-		desc_p->txrx_status |= DESC_RXSTS_OWNBYDMA;
+static int _dw_free_pkt(struct dw_eth_dev *priv)
+{
+	u32 desc_num = priv->rx_currdescnum;
+	struct dmamacdescr *desc_p = &priv->rx_mac_descrtable[desc_num];
+	uint32_t desc_start = (uint32_t)desc_p;
+	uint32_t desc_end = desc_start +
+		roundup(sizeof(*desc_p), ARCH_DMA_MINALIGN);
 
-		/* Flush only status field - others weren't changed */
-		flush_dcache_range(desc_start, desc_end);
+	/*
+	 * Make the current descriptor valid again and go to
+	 * the next one
+	 */
+	desc_p->txrx_status |= DESC_RXSTS_OWNBYDMA;
 
-		/* Test the wrap-around condition. */
-		if (++desc_num >= CONFIG_RX_DESCR_NUM)
-			desc_num = 0;
-	}
+	/* Flush only status field - others weren't changed */
+	flush_dcache_range(desc_start, desc_end);
 
+	/* Test the wrap-around condition. */
+	if (++desc_num >= CONFIG_RX_DESCR_NUM)
+		desc_num = 0;
 	priv->rx_currdescnum = desc_num;
 
-	return length;
+	return 0;
 }
 
 static int dw_phy_init(struct dw_eth_dev *priv, void *dev)
@@ -414,6 +426,7 @@ static int dw_phy_init(struct dw_eth_dev *priv, void *dev)
 	return 0;
 }
 
+#ifndef CONFIG_DM_ETH
 static int dw_eth_init(struct eth_device *dev, bd_t *bis)
 {
 	return _dw_eth_init(dev->priv, dev->enetaddr);
@@ -426,7 +439,17 @@ static int dw_eth_send(struct eth_device *dev, void *packet, int length)
 
 static int dw_eth_recv(struct eth_device *dev)
 {
-	return _dw_eth_recv(dev->priv);
+	uchar *packet;
+	int length;
+
+	length = _dw_eth_recv(dev->priv, &packet);
+	if (length == -EAGAIN)
+		return 0;
+	net_process_received_packet(packet, length);
+
+	_dw_free_pkt(dev->priv);
+
+	return 0;
 }
 
 static void dw_eth_halt(struct eth_device *dev)
@@ -486,3 +509,115 @@ int designware_initialize(ulong base_addr, u32 interface)
 
 	return dw_phy_init(priv, dev);
 }
+#endif
+
+#ifdef CONFIG_DM_ETH
+static int designware_eth_start(struct udevice *dev)
+{
+	struct eth_pdata *pdata = dev_get_platdata(dev);
+
+	return _dw_eth_init(dev->priv, pdata->enetaddr);
+}
+
+static int designware_eth_send(struct udevice *dev, void *packet, int length)
+{
+	struct dw_eth_dev *priv = dev_get_priv(dev);
+
+	return _dw_eth_send(priv, packet, length);
+}
+
+static int designware_eth_recv(struct udevice *dev, uchar **packetp)
+{
+	struct dw_eth_dev *priv = dev_get_priv(dev);
+
+	return _dw_eth_recv(priv, packetp);
+}
+
+static int designware_eth_free_pkt(struct udevice *dev, uchar *packet,
+				   int length)
+{
+	struct dw_eth_dev *priv = dev_get_priv(dev);
+
+	return _dw_free_pkt(priv);
+}
+
+static void designware_eth_stop(struct udevice *dev)
+{
+	struct dw_eth_dev *priv = dev_get_priv(dev);
+
+	return _dw_eth_halt(priv);
+}
+
+static int designware_eth_write_hwaddr(struct udevice *dev)
+{
+	struct eth_pdata *pdata = dev_get_platdata(dev);
+	struct dw_eth_dev *priv = dev_get_priv(dev);
+
+	return _dw_write_hwaddr(priv, pdata->enetaddr);
+}
+
+static int designware_eth_probe(struct udevice *dev)
+{
+	struct eth_pdata *pdata = dev_get_platdata(dev);
+	struct dw_eth_dev *priv = dev_get_priv(dev);
+	int ret;
+
+	debug("%s, iobase=%lx, priv=%p\n", __func__, pdata->iobase, priv);
+	priv->mac_regs_p = (struct eth_mac_regs *)pdata->iobase;
+	priv->dma_regs_p = (struct eth_dma_regs *)(pdata->iobase +
+			DW_DMA_BASE_OFFSET);
+	priv->interface = pdata->phy_interface;
+
+	dw_mdio_init(dev->name, priv->mac_regs_p);
+	priv->bus = miiphy_get_dev_by_name(dev->name);
+
+	ret = dw_phy_init(priv, dev);
+	debug("%s, ret=%d\n", __func__, ret);
+
+	return ret;
+}
+
+static const struct eth_ops designware_eth_ops = {
+	.start			= designware_eth_start,
+	.send			= designware_eth_send,
+	.recv			= designware_eth_recv,
+	.free_pkt		= designware_eth_free_pkt,
+	.stop			= designware_eth_stop,
+	.write_hwaddr		= designware_eth_write_hwaddr,
+};
+
+static int designware_eth_ofdata_to_platdata(struct udevice *dev)
+{
+	struct eth_pdata *pdata = dev_get_platdata(dev);
+	const char *phy_mode;
+
+	pdata->iobase = dev_get_addr(dev);
+	pdata->phy_interface = -1;
+	phy_mode = fdt_getprop(gd->fdt_blob, dev->of_offset, "phy-mode", NULL);
+	if (phy_mode)
+		pdata->phy_interface = phy_get_interface_by_name(phy_mode);
+	if (pdata->phy_interface == -1) {
+		debug("%s: Invalid PHY interface '%s'\n", __func__, phy_mode);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct udevice_id designware_eth_ids[] = {
+	{ .compatible = "allwinner,sun7i-a20-gmac" },
+	{ }
+};
+
+U_BOOT_DRIVER(eth_sandbox) = {
+	.name	= "eth_designware",
+	.id	= UCLASS_ETH,
+	.of_match = designware_eth_ids,
+	.ofdata_to_platdata = designware_eth_ofdata_to_platdata,
+	.probe	= designware_eth_probe,
+	.ops	= &designware_eth_ops,
+	.priv_auto_alloc_size = sizeof(struct dw_eth_dev),
+	.platdata_auto_alloc_size = sizeof(struct eth_pdata),
+	.flags = DM_FLAG_ALLOC_PRIV_DMA,
+};
+#endif

drivers/net/designware.h

@@ -228,8 +228,9 @@ struct dw_eth_dev {
 
 	struct eth_mac_regs *mac_regs_p;
 	struct eth_dma_regs *dma_regs_p;
-
+#ifndef CONFIG_DM_ETH
 	struct eth_device *dev;
+#endif
 	struct phy_device *phydev;
 	struct mii_dev *bus;
 };