net: pch_gbe: CPU accessible addresses are virtual

Use the virt_to_bus & bus_to_virt functions rather than phys_to_bus &
bus_to_phys, since the addresses accessed by the CPU will be virtual
rather than physical. On MIPS physical & virtual addresses differ as we
use virtual addresses in kseg0, and attempting to use physical addresses
directly caused problems as they're in the user segment which would be
mapped via the uninitialised TLB.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

drivers/net/pch_gbe.c

@@ -117,15 +117,15 @@ static void pch_gbe_rx_descs_init(struct udevice *dev)
 
 	memset(rx_desc, 0, sizeof(struct pch_gbe_rx_desc) * PCH_GBE_DESC_NUM);
 	for (i = 0; i < PCH_GBE_DESC_NUM; i++)
-		rx_desc[i].buffer_addr = dm_pci_phys_to_mem(priv->dev,
+		rx_desc[i].buffer_addr = dm_pci_virt_to_mem(priv->dev,
 			priv->rx_buff[i]);
 
-	writel(dm_pci_phys_to_mem(priv->dev, (ulong)rx_desc),
+	writel(dm_pci_virt_to_mem(priv->dev, rx_desc),
 	       &mac_regs->rx_dsc_base);
 	writel(sizeof(struct pch_gbe_rx_desc) * (PCH_GBE_DESC_NUM - 1),
 	       &mac_regs->rx_dsc_size);
 
-	writel(dm_pci_phys_to_mem(priv->dev, (ulong)(rx_desc + 1)),
+	writel(dm_pci_virt_to_mem(priv->dev, rx_desc + 1),
 	       &mac_regs->rx_dsc_sw_p);
 }
 
@@ -137,11 +137,11 @@ static void pch_gbe_tx_descs_init(struct udevice *dev)
 
 	memset(tx_desc, 0, sizeof(struct pch_gbe_tx_desc) * PCH_GBE_DESC_NUM);
 
-	writel(dm_pci_phys_to_mem(priv->dev, (ulong)tx_desc),
+	writel(dm_pci_virt_to_mem(priv->dev, tx_desc),
 	       &mac_regs->tx_dsc_base);
 	writel(sizeof(struct pch_gbe_tx_desc) * (PCH_GBE_DESC_NUM - 1),
 	       &mac_regs->tx_dsc_size);
-	writel(dm_pci_phys_to_mem(priv->dev, (ulong)(tx_desc + 1)),
+	writel(dm_pci_virt_to_mem(priv->dev, tx_desc + 1),
 	       &mac_regs->tx_dsc_sw_p);
 }
 
@@ -251,7 +251,7 @@ static int pch_gbe_send(struct udevice *dev, void *packet, int length)
 	if (length < 64)
 		frame_ctrl |= PCH_GBE_TXD_CTRL_APAD;
 
-	tx_desc->buffer_addr = dm_pci_phys_to_mem(priv->dev, (ulong)packet);
+	tx_desc->buffer_addr = dm_pci_virt_to_mem(priv->dev, packet);
 	tx_desc->length = length;
 	tx_desc->tx_words_eob = length + 3;
 	tx_desc->tx_frame_ctrl = frame_ctrl;
@@ -262,7 +262,7 @@ static int pch_gbe_send(struct udevice *dev, void *packet, int length)
 	if (++priv->tx_idx >= PCH_GBE_DESC_NUM)
 		priv->tx_idx = 0;
 
-	writel(dm_pci_phys_to_mem(priv->dev, (ulong)(tx_head + priv->tx_idx)),
+	writel(dm_pci_virt_to_mem(priv->dev, tx_head + priv->tx_idx),
 	       &mac_regs->tx_dsc_sw_p);
 
 	start = get_timer(0);
@@ -283,7 +283,8 @@ static int pch_gbe_recv(struct udevice *dev, int flags, uchar **packetp)
 	struct pch_gbe_priv *priv = dev_get_priv(dev);
 	struct pch_gbe_regs *mac_regs = priv->mac_regs;
 	struct pch_gbe_rx_desc *rx_desc;
-	ulong hw_desc, buffer_addr, length;
+	ulong hw_desc, length;
+	void *buffer;
 
 	rx_desc = &priv->rx_desc[priv->rx_idx];
 
@@ -291,12 +292,12 @@ static int pch_gbe_recv(struct udevice *dev, int flags, uchar **packetp)
 	hw_desc = readl(&mac_regs->rx_dsc_hw_p_hld);
 
 	/* Just return if not receiving any packet */
-	if ((ulong)rx_desc == hw_desc)
+	if (virt_to_phys(rx_desc) == hw_desc)
 		return -EAGAIN;
 
-	buffer_addr = dm_pci_mem_to_phys(priv->dev, rx_desc->buffer_addr);
-	*packetp = (uchar *)buffer_addr;
 	length = rx_desc->rx_words_eob - 3 - ETH_FCS_LEN;
+	buffer = dm_pci_mem_to_virt(priv->dev, rx_desc->buffer_addr, length, 0);
+	*packetp = (uchar *)buffer;
 
 	return length;
 }
@@ -315,7 +316,7 @@ static int pch_gbe_free_pkt(struct udevice *dev, uchar *packet, int length)
 	if (++rx_swp >= PCH_GBE_DESC_NUM)
 		rx_swp = 0;
 
-	writel(dm_pci_phys_to_mem(priv->dev, (ulong)(rx_head + rx_swp)),
+	writel(dm_pci_virt_to_mem(priv->dev, rx_head + rx_swp),
 	       &mac_regs->rx_dsc_sw_p);
 
 	return 0;