Subject: [PATCH 25/32] powerpc: spider uses low level BE MMIO accessors

From: Benjamin Herrenschmidt <[email-masked]>
Date: Sat, 11 Nov 2006 17:25:13 +1100

We use the powerpc specific low level MMIO accessor variants instead
of readl() or readl_be() because we know spidernet is not a real PCI
device and we can thus avoid the performance hit caused by the PCI
workarounds.

Signed-off-by: Benjamin Herrenschmidt <[email-masked]>

 drivers/net/spider_net.c |   18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

Index: linux-cell/drivers/net/spider_net.c
===================================================================
--- linux-cell.orig/drivers/net/spider_net.c	2006-11-07 15:10:08.000000000 +1100
+++ linux-cell/drivers/net/spider_net.c	2006-11-07 15:11:26.000000000 +1100
@@ -88,12 +88,11 @@ MODULE_DEVICE_TABLE(pci, spider_net_pci_
 static inline u32
 spider_net_read_reg(struct spider_net_card *card, u32 reg)
 {
-	u32 value;
-
-	value = readl(card->regs + reg);
-	value = le32_to_cpu(value);
-
-	return value;
+	/* We use the powerpc specific variants instead of readl_be() because
+	 * we know spidernet is not a real PCI device and we can thus avoid the
+	 * performance hit caused by the PCI workarounds.
+	 */
+	return in_be32(card->regs + reg);
 }
 
 /**
@@ -105,8 +104,11 @@ spider_net_read_reg(struct spider_net_ca
 static inline void
 spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value)
 {
-	value = cpu_to_le32(value);
-	writel(value, card->regs + reg);
+	/* We use the powerpc specific variants instead of writel_be() because
+	 * we know spidernet is not a real PCI device and we can thus avoid the
+	 * performance hit caused by the PCI workarounds.
+	 */
+	out_be32(card->regs + reg, value);
 }
 
 /** spider_net_write_phy - write to phy register