pci_machdep.c

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

/*	$Id: pci_machdep.c,v 1.2 2002/11/07 15:05:30 pefo Exp $ */

/*
 * Copyright (c) 2000-2002 Opsycon AB  (www.opsycon.se)
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Opsycon AB, Sweden.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
 *
 */
#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>

#include <machine/bus.h>
#include <machine/pio.h>

#include <pmon.h>

/* PCI i/o regions in PCI space */
#define PCI_IO_SPACE_PCI_BASE		0x00000000

/* PCI mem regions in PCI space */
#define PCI_LOCAL_MEM_PCI_BASE	0x00000000	/* CPU Mem accessed from PCI */

/* soft versions of above */
static pcireg_t pci_local_mem_pci_base;

extern int _pciverbose;
extern void *pmalloc __P((size_t ));

extern int monarch_mode;

static struct pci_bus *_pci_bus[16];
static int _max_pci_bus = 0;

struct bartab {
	int	scslow,	scshigh;
	int	pci0size, pci1size;
	int	bar0;
} barlist[] = {
{ SCS_0_LOW_DECODE_ADDRESS, SCS_0_HIGH_DECODE_ADDRESS,
  PCI_0SCS_0_BANK_SIZE, PCI_1SCS_0_BANK_SIZE,
  PCI_SCS_0_BASE_ADDRESS },
{ SCS_1_LOW_DECODE_ADDRESS, SCS_1_HIGH_DECODE_ADDRESS,
  PCI_0SCS_1_BANK_SIZE, PCI_1SCS_1_BANK_SIZE,
  PCI_SCS_1_BASE_ADDRESS },
{ SCS_2_LOW_DECODE_ADDRESS, SCS_2_HIGH_DECODE_ADDRESS,
  PCI_0SCS_2_BANK_SIZE, PCI_1SCS_2_BANK_SIZE,
  PCI_SCS_2_BASE_ADDRESS },
{ SCS_3_LOW_DECODE_ADDRESS, SCS_3_HIGH_DECODE_ADDRESS, 
  PCI_0SCS_3_BANK_SIZE, PCI_1SCS_3_BANK_SIZE,
  PCI_SCS_3_BASE_ADDRESS },
{ CS_0_LOW_DECODE_ADDRESS, CS_0_HIGH_DECODE_ADDRESS,
  PCI_0CS_0_BANK_SIZE, PCI_1CS_0_BANK_SIZE,
  PCI_CS_0_BASE_ADDRESS },
{ CS_1_LOW_DECODE_ADDRESS, CS_1_HIGH_DECODE_ADDRESS,
  PCI_0CS_1_BANK_SIZE, PCI_1CS_1_BANK_SIZE,
  PCI_CS_1_BASE_ADDRESS },
{ CS_2_LOW_DECODE_ADDRESS, CS_2_HIGH_DECODE_ADDRESS,
  PCI_0CS_2_BANK_SIZE, PCI_1CS_2_BANK_SIZE,
  PCI_CS_2_BASE_ADDRESS },
{ CS_0_LOW_DECODE_ADDRESS, CS_0_HIGH_DECODE_ADDRESS,
  PCI_0CS_3_BANK_SIZE, PCI_1CS_3_BANK_SIZE,
  PCI_CS_3_BASE_ADDRESS },
{ BOOTCS_LOW_DECODE_ADDRESS, BOOTCS_HIGH_DECODE_ADDRESS,
  PCI_0CS_BOOT_BANK_SIZE, PCI_1CS_BOOT_BANK_SIZE,
  PCI_BOOTCS_BASE_ADDRESS },
};

#define NBARS (sizeof(barlist) / sizeof(struct bartab))

/*
 * Called to initialise the bridge at the beginning of time
 */
int
_pci_hwinit(initialise, iot, memt)
	int initialise;
	bus_space_tag_t iot;
	bus_space_tag_t memt;
{
        pcireg_t stat;
	int i;
	struct pci_device *pcidev;
	struct pci_bus *pcibus;

	if (inb(MISC_MARCH) & 1) {
		printf("PCI Monarch mode\n");
		monarch_mode = 1;
	}
	else {
		printf("PCI Non-Monarch mode\n");
		monarch_mode = 0;
	}

        /*
         *  PCI and local bus maps 1-1
         */
        iot->bus_base = PA_TO_VA(0);
        iot->bus_reverse = 1;
        memt->bus_base = PA_TO_VA(0);
        memt->bus_reverse = 1;

	/*
	 *  Where PCI finds our RAM memory in the PCI map
	 */
        pci_local_mem_pci_base = PCI_LOCAL_MEM_PCI_BASE;

	if (!initialise) {
		return(0);
	}

	/*
	 *  Allocate and initialize PCI bus heads.
	 */
	pcidev = pmalloc(sizeof(struct pci_device));
	pcibus = pmalloc(sizeof(struct pci_bus));
	if(pcidev == NULL || pcibus == NULL) {
		printf("pci: can't alloc memory, pci not initialized\n");
		return(-1);
	}

	pcidev->pa.pa_flags = PCI_FLAGS_IO_ENABLED | PCI_FLAGS_MEM_ENABLED;
	pcidev->pa.pa_iot = iot;
	pcidev->pa.pa_memt = memt;
	pcidev->pa.pa_dmat = &bus_dmamap_tag;
	pcidev->bridge.secbus = pcibus;
	_pci_head = pcidev;

	pcibus->minpcimemaddr  = PCI0_MEM_SPACE_BASE;
	pcibus->nextpcimemaddr = PCI0_MEM_SPACE_BASE + PCI0_MEM_SPACE_SIZE;
	pcibus->minpciioaddr  = PCI0_IO_SPACE_BASE;
	pcibus->nextpciioaddr = PCI0_IO_SPACE_BASE + PCI0_IO_SPACE_SIZE;
	pcibus->pci_mem_base   = PCI0_MEM_SPACE_BASE; /* Maps 1-1 */
	pcibus->pci_io_base    = PCI0_IO_SPACE_BASE; /* Maps 1-1 */
	pcibus->max_lat = 255;
	pcibus->fast_b2b = 1;
	pcibus->prefetch = 1;
	pcibus->bandwidth = 4000000;
	pcibus->ndev = 1;
	_pci_bushead = pcibus;
	_pci_bus[_max_pci_bus++] = pcibus;

#if 0
	/*
	 * PCI Bus 1
	 */
	pcidev = pmalloc(sizeof(struct pci_device));
	pcibus = pmalloc(sizeof(struct pci_bus));
	if(pcidev == NULL || pcibus == NULL) {
		printf("pci: can't alloc memory. pci not initialized\n");
		return(-1);
	}

	*pcidev = *_pci_head;
	pcidev->bridge.secbus = pcibus;
	_pci_head->next = pcidev;

	*pcibus = *_pci_bushead;
	pcibus->minpcimemaddr  = PCI1_MEM_SPACE_BASE;
	pcibus->nextpcimemaddr = PCI1_MEM_SPACE_BASE + PCI1_MEM_SPACE_SIZE;
	pcibus->minpciioaddr  = PCI1_IO_SPACE_BASE;
	pcibus->nextpciioaddr = PCI1_IO_SPACE_BASE + PCI1_IO_SPACE_SIZE;
	pcibus->pci_mem_base   = PCI1_MEM_SPACE_BASE; /* Maps 1-1 */
	pcibus->pci_io_base    = PCI1_IO_SPACE_BASE; /* Maps 1-1 */

	_pci_bushead->next = pcibus;
	_pci_bus[_max_pci_bus++] = pcibus;
#endif

        /*
         *  Enable PCI 0 as master to do config cycles.
         */
        stat = _pci_conf_read(_pci_make_tag(0, 0, 0), PCI_COMMAND_STATUS_REG);
        stat |= PCI_COMMAND_MASTER_ENABLE | PCI_COMMAND_MEM_ENABLE;
        _pci_conf_write(_pci_make_tag(0, 0, 0), PCI_COMMAND_STATUS_REG, stat);

#if 0
        /*
         *  Enable PCI 1 as master to do config cycles.
         */
        stat = _pci_conf_read(_pci_make_tag(1, 0, 0), PCI_COMMAND_STATUS_REG);
        stat |= PCI_COMMAND_MASTER_ENABLE | PCI_COMMAND_MEM_ENABLE;
        _pci_conf_write(_pci_make_tag(1, 0, 0), PCI_COMMAND_STATUS_REG, stat);
#endif

	/*
	 *  Set up CPU to PCI mappings.
	 */
	GT_WRITE(PCI_0I_O_LOW_DECODE_ADDRESS, PCI0_IO_SPACE_BASE >> 20);
        GT_WRITE(PCI_0I_O_HIGH_DECODE_ADDRESS,
		 (PCI0_IO_SPACE_BASE + PCI0_IO_SPACE_SIZE - 1) >> 20);
	GT_WRITE(PCI_0MEMORY0_LOW_DECODE_ADDRESS, PCI0_MEM_SPACE_BASE >> 20);
        GT_WRITE(PCI_0MEMORY0_HIGH_DECODE_ADDRESS,
		 (PCI0_MEM_SPACE_BASE + PCI0_MEM_SPACE_SIZE - 1) >> 20);
	GT_WRITE(PCI_0MEMORY1_LOW_DECODE_ADDRESS, 0xffffffff >> 20);
        GT_WRITE(PCI_0MEMORY1_HIGH_DECODE_ADDRESS, 0);
	GT_WRITE(PCI_0MEMORY2_LOW_DECODE_ADDRESS, 0xffffffff >> 20);
        GT_WRITE(PCI_0MEMORY2_HIGH_DECODE_ADDRESS, 0);
	GT_WRITE(PCI_0MEMORY3_LOW_DECODE_ADDRESS, 0xffffffff >> 20);
        GT_WRITE(PCI_0MEMORY3_HIGH_DECODE_ADDRESS, 0);
	
#if 0
	GT_WRITE(PCI_1I_O_LOW_DECODE_ADDRESS, PCI1_IO_SPACE_BASE >> 20);
        GT_WRITE(PCI_1I_O_HIGH_DECODE_ADDRESS,
		 (PCI1_IO_SPACE_BASE + PCI1_IO_SPACE_SIZE - 1) >> 20);
	GT_WRITE(PCI_1MEMORY0_LOW_DECODE_ADDRESS, PCI1_MEM_SPACE_BASE >> 20);
        GT_WRITE(PCI_1MEMORY0_HIGH_DECODE_ADDRESS,
		 (PCI1_MEM_SPACE_BASE + PCI1_MEM_SPACE_SIZE - 1) >> 20);
	GT_WRITE(PCI_1MEMORY1_LOW_DECODE_ADDRESS, 0xffffffff >> 20);
        GT_WRITE(PCI_1MEMORY1_HIGH_DECODE_ADDRESS, 0);
	GT_WRITE(PCI_1MEMORY2_LOW_DECODE_ADDRESS, 0xffffffff >> 20);
        GT_WRITE(PCI_1MEMORY2_HIGH_DECODE_ADDRESS, 0);
	GT_WRITE(PCI_1MEMORY3_LOW_DECODE_ADDRESS, 0xffffffff >> 20);
        GT_WRITE(PCI_1MEMORY3_HIGH_DECODE_ADDRESS, 0);
#endif
	
        /*
         *  Set up mapping for PCI to localmem accesses.
	 *  config regs to find mapping and size. BAR and
	 *  size register should be set to match SDRAM SCS.
         */

	for(i = 0; i < NBARS; i++) {
		u_int32_t baselo, basehi;
		pcitag_t tag;

		baselo = GT_READ(barlist[i].scslow) << 20;
		basehi = (GT_READ(barlist[i].scshigh) + 1) << 20;

		if(baselo > basehi) { /* Disabled */
			baselo = 0;
			basehi = 0;
		}
		else {
			basehi -= 1;
		}

		tag = _pci_make_tag(0, 0, (barlist[i].bar0 & 0x700) >> 8);
		stat = _pci_conf_read(tag, barlist[i].bar0 & 0xff) & 0xffff;
		stat |= baselo & 0xfffff000;
		_pci_conf_write(tag, barlist[i].bar0 & 0xff, stat);
		tag = _pci_make_tag(1, 0, (barlist[i].bar0 & 0x700) >> 8);
		stat = _pci_conf_read(tag, barlist[i].bar0 & 0xff) & 0xffff;
		stat |= baselo & 0xfffff000;
		_pci_conf_write(tag, barlist[i].bar0 & 0xff, stat);

		GT_WRITE(barlist[i].pci0size, (basehi - baselo) & 0xfffff000);
		GT_WRITE(barlist[i].pci1size, (basehi - baselo) & 0xfffff000);
	}

	/*
	 *  Set up PCI to snoop to writeback.
	 */
	GT_WRITE(PCI_0SNOOP_CONTROL_BASE_0_LOW, 0x2000);
	GT_WRITE(PCI_1SNOOP_CONTROL_BASE_0_LOW, 0x2000);
	GT_WRITE(PCI_0SNOOP_CONTROL_TOP_0, memorysize >> 20);
	GT_WRITE(PCI_1SNOOP_CONTROL_TOP_0, memorysize >> 20);

#if defined(GT_REV_A_INT_ARB)
        /*
         *  This target uses the internal arbiter
         */
        stat = GT_READ(PCI_0ARBITER_CONTROL);
        stat |= 0x80000000;
        GT_WRITE(PCI_0ARBITER_CONTROL, stat);
        stat = GT_READ(PCI_1ARBITER_CONTROL);
        stat |= 0x80000000;
        GT_WRITE(PCI_1ARBITER_CONTROL, stat); 
#endif

        return(1);
}


/*
 * Called to reinitialise the bridge after we've scanned each PCI device
 * and know what is possible.
 */
void
_pci_hwreinit (void)
{
}

void
_pci_flush (void)
{
}


/*
 *  Map the CPU virtual address of an area of local memory to a PCI
 *  address that can be used by a PCI bus master to access it.
 */
vm_offset_t
_pci_dmamap(va, len)
	vm_offset_t va;
	unsigned int len;
{
	return(pci_local_mem_pci_base + VA_TO_PA (va));
}

/*
 *  Map the PCI address of an area of local memory to a CPU physical
 *  address.
 */
vm_offset_t
_pci_cpumap(pcia, len)
	vm_offset_t pcia;
	unsigned int len;
{
	return PA_TO_VA(pcia - pci_local_mem_pci_base);
}

/*
 *  Make pci tag from bus, device and function data.
 */
pcitag_t
_pci_make_tag(bus, device, function)
	int bus;
	int device;
	int function;
{
	pcitag_t tag;

	tag = (bus << 16) | (device << 11) | (function << 8);
	return(tag);
}

/*
 *  Break up a pci tag to bus, device function components.
 */
void
_pci_break_tag(tag, busp, devicep, functionp)
	pcitag_t tag;
	int *busp;
	int *devicep;
	int *functionp;
{
	if (busp) {
		*busp = (tag >> 16) & 255;
	}
	if (devicep) {
		*devicep = (tag >> 11) & 31;
	}
	if (functionp) {
		*functionp = (tag >> 8) & 7;
	}
}

int
_pci_canscan (pcitag_t tag)
{
	int bus, device, function;

	_pci_break_tag (tag, &bus, &device, &function);
	if((bus == 0 || bus == 1) && device == 0) {
		return(0);		/* Ignore the Discovery itself */
	}
	return (1);
}

/*
 *  Read a value from PCI configuration space.
 */
pcireg_t
_pci_conf_read(tag, reg)
	pcitag_t tag;
	int reg;
{
	pcireg_t data;
	u_int32_t adr;
	int bus, device, function;

	if (reg < 0 || reg >= 0x100) {
		if (_pciverbose >= 1) {
			_pci_tagprintf (tag, "_pci_conf_readn: bad reg 0x%x\r\n", reg);
		}
		return ~0;
	}
        _pci_break_tag (tag, &bus, &device, &function);

        /* Type 0 configuration on onboard PCI bus */
        if (device > 29 || function > 7) {
                return ~0;              /* device out of range */
        }
        adr = (device << 11) | (function << 8) | reg | GT_IPCI_CFGADDR_ConfigEn;

        if (bus == 0) {
                GT_WRITE(PCI_0CONFIGURATION_ADDRESS, adr);
                data = GT_READ(PCI_0CONFIGURATION_DATA_VIRTUAL_REGISTER);
        }
        else if (bus == 1) {
                GT_WRITE(PCI_1CONFIGURATION_ADDRESS, adr);
                data = GT_READ(PCI_1CONFIGURATION_DATA_VIRTUAL_REGISTER);
        }
	else {
		data = ~0;
	}

        return data;
}

/*
 *  Write a value to PCI configuration space.
 */
void
_pci_conf_write(tag, reg, data)
	pcitag_t tag;
	int reg;
	pcireg_t data;
{
	u_int32_t adr;
	int bus, device, function;

	if (reg < 0 || reg >= 0x100) {
		if (_pciverbose >= 1) { 
			_pci_tagprintf(tag, "_pci_conf_writen: bad reg %x\r\n", reg);
		}
		return;
	}

	_pci_break_tag (tag, &bus, &device, &function);

	/* Type 0 configuration on onboard PCI buses */
	if (device > 29 || function > 7) {
		return;         /* device out of range */
	}
	adr = (device << 11) | (function << 8) | reg | GT_IPCI_CFGADDR_ConfigEn;

        if(bus == 0) {
                GT_WRITE(PCI_0CONFIGURATION_ADDRESS, adr);
                GT_WRITE(PCI_0CONFIGURATION_DATA_VIRTUAL_REGISTER, data);
        }
        else {
                GT_WRITE(PCI_1CONFIGURATION_ADDRESS, adr);
                GT_WRITE(PCI_1CONFIGURATION_DATA_VIRTUAL_REGISTER, data);
        }
}


void *
_pci_map_int(tag, level, func, arg)
	pcitag_t tag;
	int level;
	int (*func) __P((void *));
	void *arg;
{
	pcireg_t data;
	int pin, bus, device;

	data = _pci_conf_read(tag, PCI_INTERRUPT_REG);

	pin = PCI_INTERRUPT_PIN(data);

	if (pin == 0) {
		/* No IRQ used. */
		return NULL;
	}

	if (pin > 4) {
		if (_pciverbose >= 1) {
			_pci_tagprintf (tag, "_pci_map_int: bad interrupt pin %d\r\n", pin);
		}
		return(NULL);
	}


	_pci_break_tag (tag, &bus, &device, NULL);

	if (bus != 0 || device > 5) {
		return(NULL);
	}

	/* XXX need to work this out based on device number etc. */
	_pci_tagprintf(tag, "_pci_map_int: attempt to map device %d pin %c\n", 
		   device, '@' + pin);
	return(NULL);
}