sh: pci: Rework SH7780 host controller detection.

This reworks how the host controller is probed, and makes it a bit more
verbose in the event a new type of controller is detected. Additionally,
we also log the revision information.

This now uses the proper access sizes for the vendor/device registers,
rather than relying on a larger access that encapsulated both of them.
Not all devices support 32-bit read cycles for these registers.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 26 insertions, 21 deletions

diff --git a/arch/sh/drivers/pci/pci-sh7780.c b/arch/sh/drivers/pci/pci-sh7780.c
index 7f4f59037544..63b5151e9aaa 100644
--- a/arch/sh/drivers/pci/pci-sh7780.c
+++ b/arch/sh/drivers/pci/pci-sh7780.c
@@ -34,33 +34,39 @@
 int __init sh7780_pci_init(struct pci_channel *chan)
 {
 	unsigned int id;
-	int ret, match = 0;
+	const char *type = NULL;
+	int ret;
 
-	pr_debug("PCI: Starting intialization.\n");
+	printk(KERN_NOTICE "PCI: Starting intialization.\n");
 
 	chan->reg_base = 0xfe040000;
 	chan->io_base = 0xfe200000;
 
-	ctrl_outl(0x00000001, SH7780_PCI_VCR2); /* Enable PCIC */
-
-	/* check for SH7780/SH7780R hardware */
-	id = pci_read_reg(chan, SH7780_PCIVID);
-	if ((id & 0xffff) == SH7780_VENDOR_ID) {
-		switch ((id >> 16) & 0xffff) {
-		case SH7763_DEVICE_ID:
-		case SH7780_DEVICE_ID:
-		case SH7781_DEVICE_ID:
-		case SH7785_DEVICE_ID:
-			match = 1;
-			break;
-		}
-	}
+	/* Enable CPU access to the PCIC registers. */
+	__raw_writel(PCIECR_ENBL, PCIECR);
 
-	if (unlikely(!match)) {
-		printk(KERN_ERR "PCI: This is not an SH7780 (%x)\n", id);
+	id = __raw_readw(chan->reg_base + SH7780_PCIVID);
+	if (id != SH7780_VENDOR_ID) {
+		printk(KERN_ERR "PCI: Unknown vendor ID 0x%04x.\n", id);
 		return -ENODEV;
 	}
 
+	id = __raw_readw(chan->reg_base + SH7780_PCIDID);
+	type = (id == SH7763_DEVICE_ID)	? "SH7763" :
+	       (id == SH7780_DEVICE_ID) ? "SH7780" :
+	       (id == SH7781_DEVICE_ID) ? "SH7781" :
+	       (id == SH7785_DEVICE_ID) ? "SH7785" :
+					  NULL;
+	if (unlikely(!type)) {
+		printk(KERN_ERR "PCI: Found an unsupported Renesas host "
+		       "controller, device id 0x%04x.\n", id);
+		return -EINVAL;
+	}
+
+	printk(KERN_NOTICE "PCI: Found a Renesas %s host "
+	       "controller, revision %d.\n", type,
+	       __raw_readb(chan->reg_base + SH7780_PCIRID));
+
 	if ((ret = sh4_pci_check_direct(chan)) != 0)
 		return ret;
 
diff --git a/arch/sh/drivers/pci/pci-sh7780.h b/arch/sh/drivers/pci/pci-sh7780.h
index fffcf1dcfedf..213f1d8c9ca5 100644
--- a/arch/sh/drivers/pci/pci-sh7780.h
+++ b/arch/sh/drivers/pci/pci-sh7780.h
@@ -20,9 +20,8 @@
 #define SH7785_DEVICE_ID	0x0007
 
 /* SH7780 Control Registers */
-#define	SH7780_PCI_VCR0		0xFE000000
-#define	SH7780_PCI_VCR1		0xFE000004
-#define	SH7780_PCI_VCR2		0xFE000008
+#define	PCIECR			0xFE000008
+#define PCIECR_ENBL		0x01
 
 /* SH7780 Specific Values */
 #define SH7780_PCI_CONFIG_BASE	0xFD000000	/* Config space base addr */