/**************************************************************************
 *
 *  BRIEF MODULE DESCRIPTION
 *     PCI initialization for IDT EB434 board
 *
 *  Copyright 2004 IDT Inc. (rischelp@idt.com)
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 **************************************************************************
 * May 2004 rkt, neb
 *
 * Initial Release
 *
 *
 *
 **************************************************************************
 */

#include <linux/autoconf.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include <asm/rc32434/rc32434.h>
#include <asm/rc32434/pci.h>

#define PCI_ACCESS_READ  0
#define PCI_ACCESS_WRITE 1

/* define an unsigned array for the PCI registers */
unsigned int korinaCnfgRegs[25] = {
	KORINA_CNFG1,	 KORINA_CNFG2,  KORINA_CNFG3,  KORINA_CNFG4,
	KORINA_CNFG5,	 KORINA_CNFG6,  KORINA_CNFG7,  KORINA_CNFG8,
	KORINA_CNFG9,	 KORINA_CNFG10, KORINA_CNFG11, KORINA_CNFG12,
	KORINA_CNFG13, KORINA_CNFG14, KORINA_CNFG15, KORINA_CNFG16,
	KORINA_CNFG17, KORINA_CNFG18, KORINA_CNFG19, KORINA_CNFG20,
	KORINA_CNFG21, KORINA_CNFG22, KORINA_CNFG23, KORINA_CNFG24
};
static struct resource rc32434_res_pci_mem1;
static struct resource rc32434_res_pci_mem2;

static struct resource rc32434_res_pci_mem1 = {
	.name = "PCI MEM1",
	.start = 0x50000000,
	.end = 0x5FFFFFFF,
	.flags = IORESOURCE_MEM,
	.parent = &rc32434_res_pci_mem1,
	.sibling = NULL,
	.child = &rc32434_res_pci_mem2
};

static struct resource rc32434_res_pci_mem2 = {
	.name = "PCI Mem2",
	.start = 0x60000000,
	.end = 0x6FFFFFFF,
	.flags = IORESOURCE_MEM,
	.parent = &rc32434_res_pci_mem1,
	.sibling = NULL,
	.child = NULL
};

static struct resource rc32434_res_pci_io1 = {
	.name = "PCI I/O1",
	.start = 0x18800000,
	.end = 0x188FFFFF,
	.flags = IORESOURCE_IO,
};

extern struct pci_ops rc32434_pci_ops;

#define PCI_MEM1_START	PCI_ADDR_START
#define PCI_MEM1_END	PCI_ADDR_START + CPUTOPCI_MEM_WIN - 1
#define PCI_MEM2_START	PCI_ADDR_START + CPUTOPCI_MEM_WIN
#define PCI_MEM2_END	PCI_ADDR_START + ( 2* CPUTOPCI_MEM_WIN)  - 1
#define PCI_IO1_START	PCI_ADDR_START + (2 * CPUTOPCI_MEM_WIN)
#define PCI_IO1_END 	PCI_ADDR_START + (2* CPUTOPCI_MEM_WIN) + CPUTOPCI_IO_WIN -1
#define PCI_IO2_START	PCI_ADDR_START + (2 * CPUTOPCI_MEM_WIN) + CPUTOPCI_IO_WIN
#define PCI_IO2_END 	PCI_ADDR_START + (2* CPUTOPCI_MEM_WIN) + (2 * CPUTOPCI_IO_WIN) -1


struct pci_controller rc32434_controller2;

struct pci_controller rc32434_controller = {
	.pci_ops 	= &rc32434_pci_ops,
	.mem_resource 	= &rc32434_res_pci_mem1,
	.io_resource 	= &rc32434_res_pci_io1,
	.mem_offset     = 0,
	.io_offset      = 0,

};

#ifdef __MIPSEB__
#define PCI_ENDIAN_FLAG PCILBAC_sb_m
#else
#define PCI_ENDIAN_FLAG 0
#endif

static int __init rc32434_pcibridge_init(void)
{
	unsigned int pcicValue, pcicData = 0;
	unsigned int dummyRead, pciCntlVal;
	int loopCount;
	unsigned int pciConfigAddr;

	pcicValue = rc32434_pci->pcic;
	pcicValue = (pcicValue >> PCIM_SHFT) & PCIM_BIT_LEN;
	if (!((pcicValue == PCIM_H_EA) ||
		 (pcicValue == PCIM_H_IA_FIX) ||
		(pcicValue == PCIM_H_IA_RR))) {
		printk("PCI init error!!!\n");
		/* Not in Host Mode, return ERROR */
		return -1;
	}
	/* Enables the Idle Grant mode, Arbiter Parking */
	pcicData |=(PCIC_igm_m|PCIC_eap_m|PCIC_en_m);
	rc32434_pci->pcic = pcicData; /* Enable the PCI bus Interface */
	/* Zero out the PCI status & PCI Status Mask */
	for(;;)
	{
	   pcicData = rc32434_pci->pcis;
	   if (!(pcicData & PCIS_rip_m))
		    break;
	}

	rc32434_pci->pcis = 0;
	rc32434_pci->pcism = 0xFFFFFFFF;
	/* Zero out the PCI decoupled registers */
	rc32434_pci->pcidac=0; /* disable PCI decoupled accesses at initialization */
	rc32434_pci->pcidas=0; /* clear the status */
	rc32434_pci->pcidasm=0x0000007F; /* Mask all the interrupts */
	/* Mask PCI Messaging Interrupts */
	rc32434_pci_msg->pciiic = 0;
	rc32434_pci_msg->pciiim = 0xFFFFFFFF;
	rc32434_pci_msg->pciioic = 0;
	rc32434_pci_msg->pciioim = 0;


	/* Setup PCILB0 as Memory Window */
	rc32434_pci->pcilba[0].a = (unsigned int) (PCI_ADDR_START);

	/* setup the PCI map address as same as the local address */

	rc32434_pci->pcilba[0].m = (unsigned int) (PCI_ADDR_START);


	/* Setup PCILBA1 as MEM */
	rc32434_pci->pcilba[0].c = ( ((SIZE_256MB & 0x1f) << PCILBAC_size_b) | PCI_ENDIAN_FLAG);
	dummyRead = rc32434_pci->pcilba[0].c; /* flush the CPU write Buffers */
	rc32434_pci->pcilba[1].a = 0x60000000;
	rc32434_pci->pcilba[1].m = 0x60000000;

	/* setup PCILBA2 as IO Window*/
	rc32434_pci->pcilba[1].c = (((SIZE_256MB & 0x1f) << PCILBAC_size_b )| PCI_ENDIAN_FLAG);
	dummyRead = rc32434_pci->pcilba[1].c; /* flush the CPU write Buffers */
	rc32434_pci->pcilba[2].a = 0x18C00000;
	rc32434_pci->pcilba[2].m = 0x18FFFFFF;

	/* setup PCILBA2 as IO Window*/
	rc32434_pci->pcilba[2].c = (((SIZE_4MB & 0x1f) << PCILBAC_size_b) | PCI_ENDIAN_FLAG );
	dummyRead = rc32434_pci->pcilba[2].c; /* flush the CPU write Buffers */

	/* Setup PCILBA3 as IO Window */
	rc32434_pci->pcilba[3].a = 0x18800000;
	rc32434_pci->pcilba[3].m = 0x18800000;
	rc32434_pci->pcilba[3].c = ( (((SIZE_1MB & 0x1ff) << PCILBAC_size_b) | PCILBAC_msi_m) | PCI_ENDIAN_FLAG);
	dummyRead = rc32434_pci->pcilba[3].c; /* flush the CPU write Buffers */

	pciConfigAddr=(unsigned int)(0x80000004);
	for(loopCount=0;loopCount<24;loopCount++){
		rc32434_pci->pcicfga=pciConfigAddr;
		dummyRead=rc32434_pci->pcicfga;
		rc32434_pci->pcicfgd = korinaCnfgRegs[loopCount];
		dummyRead=rc32434_pci->pcicfgd;
		pciConfigAddr += 4;
	}
	rc32434_pci->pcitc = (unsigned int)((PCITC_RTIMER_VAL&0xff) << PCITC_rtimer_b)
		| ((PCITC_DTIMER_VAL&0xff) << PCITC_dtimer_b);

	pciCntlVal=rc32434_pci->pcic;
	pciCntlVal &=~(PCIC_tnr_m);
	rc32434_pci->pcic = pciCntlVal;
	pciCntlVal=rc32434_pci->pcic;
	return 0;
}

/* Do platform specific device initialization at pci_enable_device() time */
int pcibios_plat_dev_init(struct pci_dev *dev)
{
	if (PCI_SLOT(dev->devfn) == 6 && dev->bus->number == 0) {
		/* disable prefetched memory range */
		pci_write_config_word(dev, PCI_PREF_MEMORY_LIMIT, 0);
		pci_write_config_word(dev, PCI_PREF_MEMORY_BASE, 0x10);

		pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 4);
	}
	return 0;
}

static int __init rc32434_pci_init(void)
{
	printk("PCI: Initializing PCI\n");

	ioport_resource.start = rc32434_res_pci_io1.start;
	ioport_resource.end = rc32434_res_pci_io1.end;

	rc32434_pcibridge_init();

	register_pci_controller(&rc32434_controller);
	rc32434_sync();
}

arch_initcall(rc32434_pci_init);