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/*
* Low-Level PCI Support for the SH7780
*
* Dustin McIntire (dustin@sensoria.com)
* Derived from arch/i386/kernel/pci-*.c which bore the message:
* (c) 1999--2000 Martin Mares <mj@ucw.cz>
*
* Ported to the new API by Paul Mundt <lethal@linux-sh.org>
* With cleanup by Paul van Gool <pvangool@mimotech.com>
*
* May be copied or modified under the terms of the GNU General Public
* License. See linux/COPYING for more information.
*
*/
#undef DEBUG
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include "pci-sh4.h"
/*
* Initialization. Try all known PCI access methods. Note that we support
* using both PCI BIOS and direct access: in such cases, we use I/O ports
* to access config space.
*
* Note that the platform specific initialization (BSC registers, and memory
* space mapping) will be called via the platform defined function
* pcibios_init_platform().
*/
int __init sh7780_pci_init(struct pci_channel *chan)
{
unsigned int id;
int ret, match = 0;
pr_debug("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;
}
}
if (unlikely(!match)) {
printk(KERN_ERR "PCI: This is not an SH7780 (%x)\n", id);
return -ENODEV;
}
if ((ret = sh4_pci_check_direct(chan)) != 0)
return ret;
return pcibios_init_platform();
}
int __init sh7780_pcic_init(struct pci_channel *chan,
struct sh4_pci_address_map *map)
{
u32 word;
/* set the command/status bits to:
* Wait Cycle Control + Parity Enable + Bus Master +
* Mem space enable
*/
pci_write_reg(chan, 0x00000046, SH7780_PCICMD);
/* define this host as the host bridge */
word = PCI_BASE_CLASS_BRIDGE << 24;
pci_write_reg(chan, word, SH7780_PCIRID);
/* Set IO and Mem windows to local address
* Make PCI and local address the same for easy 1 to 1 mapping
*/
pci_write_reg(chan, map->window0.size - 0xfffff, SH4_PCILSR0);
pci_write_reg(chan, map->window1.size - 0xfffff, SH4_PCILSR1);
/* Set the values on window 0 PCI config registers */
pci_write_reg(chan, map->window0.base, SH4_PCILAR0);
pci_write_reg(chan, map->window0.base, SH7780_PCIMBAR0);
/* Set the values on window 1 PCI config registers */
pci_write_reg(chan, map->window1.base, SH4_PCILAR1);
pci_write_reg(chan, map->window1.base, SH7780_PCIMBAR1);
/* Apply any last-minute PCIC fixups */
pci_fixup_pcic(chan);
/* SH7780 init done, set central function init complete */
/* use round robin mode to stop a device starving/overruning */
word = SH4_PCICR_PREFIX | SH4_PCICR_CFIN | SH4_PCICR_FTO;
pci_write_reg(chan, word, SH4_PCICR);
return 0;
}
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