4 files changed, 96 insertions, 1 deletions

diff --git a/arch/sh/drivers/pci/Makefile b/arch/sh/drivers/pci/Makefile
index 2c458b602be..4a59e689087 100644
--- a/arch/sh/drivers/pci/Makefile
+++ b/arch/sh/drivers/pci/Makefile
@@ -1,7 +1,7 @@
 #
 # Makefile for the PCI specific kernel interface routines under Linux.
 #
-obj-y					+= pci.o
+obj-y					+= common.o pci.o
 
 obj-$(CONFIG_CPU_SUBTYPE_SH7751)	+= pci-sh7751.o ops-sh4.o
 obj-$(CONFIG_CPU_SUBTYPE_SH7751R)	+= pci-sh7751.o ops-sh4.o
diff --git a/arch/sh/drivers/pci/common.c b/arch/sh/drivers/pci/common.c
new file mode 100644
index 00000000000..f67c946a861
--- /dev/null
+++ b/arch/sh/drivers/pci/common.c
@@ -0,0 +1,64 @@
+#include <linux/pci.h>
+#include <linux/kernel.h>
+
+static int __init
+early_read_config_word(struct pci_channel *hose,
+		       int top_bus, int bus, int devfn, int offset, u16 *value)
+{
+	struct pci_dev fake_dev;
+	struct pci_bus fake_bus;
+
+	fake_dev.bus = &fake_bus;
+	fake_dev.sysdata = hose;
+	fake_dev.devfn = devfn;
+	fake_bus.number = bus;
+	fake_bus.sysdata = hose;
+	fake_bus.ops = hose->pci_ops;
+
+	if (bus != top_bus)
+		/* Fake a parent bus structure. */
+		fake_bus.parent = &fake_bus;
+	else
+		fake_bus.parent = NULL;
+
+	return pci_read_config_word(&fake_dev, offset, value);
+}
+
+int __init pci_is_66mhz_capable(struct pci_channel *hose,
+				int top_bus, int current_bus)
+{
+	u32 pci_devfn;
+	unsigned short vid;
+	int cap66 = -1;
+	u16 stat;
+
+	printk(KERN_INFO "PCI: Checking 66MHz capabilities...\n");
+
+	for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) {
+		if (PCI_FUNC(pci_devfn))
+			continue;
+		if (early_read_config_word(hose, top_bus, current_bus,
+					   pci_devfn, PCI_VENDOR_ID, &vid) !=
+		    PCIBIOS_SUCCESSFUL)
+			continue;
+		if (vid == 0xffff)
+			continue;
+
+		/* check 66MHz capability */
+		if (cap66 < 0)
+			cap66 = 1;
+		if (cap66) {
+			early_read_config_word(hose, top_bus, current_bus,
+					       pci_devfn, PCI_STATUS, &stat);
+			if (!(stat & PCI_STATUS_66MHZ)) {
+				printk(KERN_DEBUG
+				       "PCI: %02x:%02x not 66MHz capable.\n",
+				       current_bus, pci_devfn);
+				cap66 = 0;
+				break;
+			}
+		}
+	}
+
+	return cap66 > 0;
+}
diff --git a/arch/sh/drivers/pci/pci-sh7780.c b/arch/sh/drivers/pci/pci-sh7780.c
index 8405c8fded6..b68f45b6451 100644
--- a/arch/sh/drivers/pci/pci-sh7780.c
+++ b/arch/sh/drivers/pci/pci-sh7780.c
@@ -41,6 +41,29 @@ static struct pci_channel sh7780_pci_controller = {
 	.io_map_base	= SH7780_PCI_IO_BASE,
 };
 
+static void __init sh7780_pci66_init(struct pci_channel *hose)
+{
+	unsigned int tmp;
+
+	if (!pci_is_66mhz_capable(hose, 0, 0))
+		return;
+
+	/* Enable register access */
+	tmp = __raw_readl(hose->reg_base + SH4_PCICR);
+	tmp |= SH4_PCICR_PREFIX;
+	__raw_writel(tmp, hose->reg_base + SH4_PCICR);
+
+	/* Enable 66MHz operation */
+	tmp = __raw_readw(hose->reg_base + PCI_STATUS);
+	tmp |= PCI_STATUS_66MHZ;
+	__raw_writew(tmp, hose->reg_base + PCI_STATUS);
+
+	/* Done */
+	tmp = __raw_readl(hose->reg_base + SH4_PCICR);
+	tmp |= SH4_PCICR_PREFIX | SH4_PCICR_CFIN;
+	__raw_writel(tmp, hose->reg_base + SH4_PCICR);
+}
+
 static int __init sh7780_pci_init(void)
 {
 	struct pci_channel *chan = &sh7780_pci_controller;
@@ -176,6 +199,12 @@ static int __init sh7780_pci_init(void)
 
 	register_pci_controller(chan);
 
+	sh7780_pci66_init(chan);
+
+	printk(KERN_NOTICE "PCI: Running at %dMHz.\n",
+	       (__raw_readw(chan->reg_base + PCI_STATUS) & PCI_STATUS_66MHZ) ?
+	       66 : 33);
+
 	return 0;
 }
 arch_initcall(sh7780_pci_init);
diff --git a/arch/sh/drivers/pci/pci.c b/arch/sh/drivers/pci/pci.c
index 45a15cab01d..63b11fddffe 100644
--- a/arch/sh/drivers/pci/pci.c
+++ b/arch/sh/drivers/pci/pci.c
@@ -88,6 +88,8 @@ void __devinit register_pci_controller(struct pci_channel *hose)
 		mutex_unlock(&pci_scan_mutex);
 	}
 
+	return;
+
 out:
 	printk(KERN_WARNING "Skipping PCI bus scan due to resource conflict\n");
 }