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Commit 4e7b7fdb authored by Paul Mundt's avatar Paul Mundt
Browse files

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: default avatarPaul Mundt <lethal@linux-sh.org>
parent 0bbc9bc3

arch/sh/drivers/pci/pci-sh7780.c

+24 −18
Original line number Diff line number Diff line
@@ -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;

arch/sh/drivers/pci/pci-sh7780.h

+2 −3
Original line number Diff line number Diff line
@@ -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 */