/*
 *	linux/arch/alpha/kernel/core_titan.c
 *
 * Code common to all TITAN core logic chips.
 */

#define __EXTERN_INLINE inline
#include <asm/io.h>
#include <asm/core_titan.h>
#undef __EXTERN_INLINE

#include <linux/module.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/bootmem.h>

#include <asm/ptrace.h>
#include <asm/smp.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include <asm/vga.h>

#include "proto.h"
#include "pci_impl.h"

/* Save Titan configuration data as the console had it set up.  */

struct
{
	unsigned long wsba[4];
	unsigned long wsm[4];
	unsigned long tba[4];
} saved_config[4] __attribute__((common));

/*
 * Is PChip 1 present? No need to query it more than once.
 */
static int titan_pchip1_present;

/*
 * BIOS32-style PCI interface:
 */

#define DEBUG_CONFIG 0

#if DEBUG_CONFIG
# define DBG_CFG(args)	printk args
#else
# define DBG_CFG(args)
#endif


/*
 * Routines to access TIG registers.
 */
static inline volatile unsigned long *
mk_tig_addr(int offset)
{
	return (volatile unsigned long *)(TITAN_TIG_SPACE + (offset << 6));
}

static inline u8 
titan_read_tig(int offset, u8 value)
{
	volatile unsigned long *tig_addr = mk_tig_addr(offset);
	return (u8)(*tig_addr & 0xff);
}

static inline void 
titan_write_tig(int offset, u8 value)
{
	volatile unsigned long *tig_addr = mk_tig_addr(offset);
	*tig_addr = (unsigned long)value;
}


/*
 * Given a bus, device, and function number, compute resulting
 * configuration space address
 * accordingly.  It is therefore not safe to have concurrent
 * invocations to configuration space access routines, but there
 * really shouldn't be any need for this.
 *
 * Note that all config space accesses use Type 1 address format.
 *
 * Note also that type 1 is determined by non-zero bus number.
 *
 * Type 1:
 *
 *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 
 *  3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *
 *	31:24	reserved
 *	23:16	bus number (8 bits = 128 possible buses)
 *	15:11	Device number (5 bits)
 *	10:8	function number
 *	 7:2	register number
 *  
 * Notes:
 *	The function number selects which function of a multi-function device 
 *	(e.g., SCSI and Ethernet).
 * 
 *	The register selects a DWORD (32 bit) register offset.  Hence it
 *	doesn't get shifted by 2 bits as we want to "drop" the bottom two
 *	bits.
 */

static int
mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where,
	     unsigned long *pci_addr, unsigned char *type1)
{
	struct pci_controller *hose = pbus->sysdata;
	unsigned long addr;
	u8 bus = pbus->number;

	DBG_CFG(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x, "
		 "pci_addr=0x%p, type1=0x%p)\n",
		 bus, device_fn, where, pci_addr, type1));

	if (!pbus->parent) /* No parent means peer PCI bus. */
		bus = 0;
        *type1 = (bus != 0);

        addr = (bus << 16) | (device_fn << 8) | where;
	addr |= hose->config_space_base;
		
	*pci_addr = addr;
	DBG_CFG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr));
	return 0;
}

static int
titan_read_config(struct pci_bus *bus, unsigned int devfn, int where,
		  int size, u32 *value)
{
	unsigned long addr;
	unsigned char type1;

	if (mk_conf_addr(bus, devfn, where, &addr, &type1))
		return PCIBIOS_DEVICE_NOT_FOUND;

	switch (size) {
	case 1:
		*value = __kernel_ldbu(*(vucp)addr);
		break;
	case 2:
		*value = __kernel_ldwu(*(vusp)addr);
		break;
	case 4:
		*value = *(vuip)addr;
		break;
	}

	return PCIBIOS_SUCCESSFUL;
}

static int 
titan_write_config(struct pci_bus *bus, unsigned int devfn, int where,
		   int size, u32 value)
{
	unsigned long addr;
	unsigned char type1;

	if (mk_conf_addr(bus, devfn, where, &addr, &type1))
		return PCIBIOS_DEVICE_NOT_FOUND;

	switch (size) {
	case 1:
		__kernel_stb(value, *(vucp)addr);
		mb();
		__kernel_ldbu(*(vucp)addr);
		break;
	case 2:
		__kernel_stw(value, *(vusp)addr);
		mb();
		__kernel_ldwu(*(vusp)addr);
		break;
	case 4:
		*(vuip)addr = value;
		mb();
		*(vuip)addr;
		break;
	}

	return PCIBIOS_SUCCESSFUL;
}

struct pci_ops titan_pci_ops = 
{
	.read =		titan_read_config,
	.write =	titan_write_config,
};


void
titan_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end)
{
	titan_pachip *pachip = 
	  (hose->index & 1) ? TITAN_pachip1 : TITAN_pachip0;
	titan_pachip_port *port;
	volatile unsigned long *csr;
	unsigned long value;

	/* Get the right hose.  */
	port = &pachip->g_port;
	if (hose->index & 2) 
		port = &pachip->a_port;

	/* We can invalidate up to 8 tlb entries in a go.  The flush
	   matches against <31:16> in the pci address.  
	   Note that gtlbi* and atlbi* are in the same place in the g_port
	   and a_port, respectively, so the g_port offset can be used
	   even if hose is an a_port */
	csr = &port->port_specific.g.gtlbia.csr;
	if (((start ^ end) & 0xffff0000) == 0)
		csr = &port->port_specific.g.gtlbiv.csr;

	/* For TBIA, it doesn't matter what value we write.  For TBI,