board/sc520_cdp/sc520_cdp_pci.c

/*
 *
 * (C) Copyright 2002
 * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <pci.h>
#include <asm/io.h>
#include <asm/pci.h>
#include <asm/ic/sc520.h>
#include <asm/ic/pci.h>

DECLARE_GLOBAL_DATA_PTR;

#undef SC520_CDP_DEBUG

#ifdef	SC520_CDP_DEBUG
#define	PRINTF(fmt,args...)	printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif

static void pci_sc520_cdp_fixup_irq(struct pci_controller *hose, pci_dev_t dev)
{
	/* a configurable lists of irqs to steal
	 * when we need one (a board with more pci interrupt pins
	 * would use a larger table */
	static int irq_list[] = {
		CONFIG_SYS_FIRST_PCI_IRQ,
		CONFIG_SYS_SECOND_PCI_IRQ,
		CONFIG_SYS_THIRD_PCI_IRQ,
		CONFIG_SYS_FORTH_PCI_IRQ
	};
	static int next_irq_index=0;

	uchar tmp_pin;
	int pin;

	pci_hose_read_config_byte(hose, dev, PCI_INTERRUPT_PIN, &tmp_pin);
	pin = tmp_pin;

	pin-=1; /* pci config space use 1-based numbering */
	if (-1 == pin) {
		return; /* device use no irq */
	}


	/* map device number +  pin to a pin on the sc520 */
	switch (PCI_DEV(dev)) {
	case 20:
		pin+=SC520_PCI_INTA;
		break;

	case 19:
		pin+=SC520_PCI_INTB;
		break;

	case 18:
		pin+=SC520_PCI_INTC;
		break;

	case 17:
		pin+=SC520_PCI_INTD;
		break;

	default:
		return;
	}

	pin&=3; /* wrap around */

	if (sc520_pci_ints[pin] == -1) {
		/* re-route one interrupt for us */
		if (next_irq_index > 3) {
			return;
		}
		if (pci_sc520_set_irq(pin, irq_list[next_irq_index])) {
			return;
		}
		next_irq_index++;
	}


	if (-1 != sc520_pci_ints[pin]) {
		pci_hose_write_config_byte(hose, dev, PCI_INTERRUPT_LINE,
					   sc520_pci_ints[pin]);
	}
	PRINTF("fixup_irq: device %d pin %c irq %d\n",
	       PCI_DEV(dev), 'A' + pin, sc520_pci_ints[pin]);
}

static struct pci_controller sc520_cdp_hose = {
	fixup_irq: pci_sc520_cdp_fixup_irq,
};

void pci_init_board(void)
{
	pci_sc520_init(&sc520_cdp_hose);
}

/*
 * This function should map a chunk of size bytes
 * of the system address space to the ISA bus
 *
 * The function will return the memory address
 * as seen by the host (which may very will be the
 * same as the bus address)
 */
u32 isa_map_rom(u32 bus_addr, int size)
{
	u32 par;

	PRINTF("isa_map_rom asked to map %d bytes at %x\n",
	       size, bus_addr);

	par = size;
	if (par < 0x80000) {
		par = 0x80000;
	}
	par >>= 12;
	par--;
	par&=0x7f;
	par <<= 18;
	par |= (bus_addr>>12);
	par |= 0x50000000;

	PRINTF ("setting PAR11 to %x\n", par);

	/* Map rom 0x10000 with PAR1 */
	sc520_mmcr->par[11] = par;

	return bus_addr;
}

/*
 * this function removed any mapping created
 * with pci_get_rom_window()
 */
void isa_unmap_rom(u32 addr)
{
	PRINTF("isa_unmap_rom asked to unmap %x", addr);
	if ((addr>>12) == (sc520_mmcr->par[11] & 0x3ffff)) {
		sc520_mmcr->par[11] = 0;
		PRINTF(" done\n");
		return;
	}
	PRINTF(" not ours\n");
}

#define PCI_ROM_TEMP_SPACE 0x10000
/*
 * This function should map a chunk of size bytes
 * of the system address space to the PCI bus,
 * suitable to map PCI ROMS (bus address < 16M)
 * the function will return the host memory address
 * which should be converted into a bus address
 * before used to configure the PCI rom address
 * decoder
 */
u32 pci_get_rom_window(struct pci_controller *hose, int size)
{
	u32 par;

	par = size;
	if (par < 0x80000) {
		par = 0x80000;
	}
	par >>= 16;
	par--;
	par&=0x7ff;
	par <<= 14;
	par |= (PCI_ROM_TEMP_SPACE>>16);
	par |= 0x72000000;

	PRINTF ("setting PAR1 to %x\n", par);

	/* Map rom 0x10000 with PAR1 */
	sc520_mmcr->par[1] = par;

	return PCI_ROM_TEMP_SPACE;
}

/*
 * this function removed any mapping created
 * with pci_get_rom_window()
 */
void pci_remove_rom_window(struct pci_controller *hose, u32 addr)
{
	PRINTF("pci_remove_rom_window: %x", addr);
	if (addr == PCI_ROM_TEMP_SPACE) {
		sc520_mmcr->par[1] = 0;
		PRINTF(" done\n");
		return;
	}
	PRINTF(" not ours\n");

}

/*
 * This function is called in order to provide acces to the
 * legacy video I/O ports on the PCI bus.
 * After this function accesses to I/O ports 0x3b0-0x3bb and
 * 0x3c0-0x3df shuld result in transactions on the PCI bus.
 *
 */
int pci_enable_legacy_video_ports(struct pci_controller *hose)
{
	/* Map video memory to 0xa0000*/
	sc520_mmcr->par[0] = 0x7200400a;

	/* forward all I/O accesses to PCI */
	sc520_mmcr->adddecctl = sc520_mmcr->adddecctl | IO_HOLE_DEST_PCI;


	/* so we map away all io ports to pci (only way to access pci io
	 * below 0x400. But then we have to map back the portions that we dont
	 * use so that the generate cycles on the GPIO bus where the sio and
	 * ISA slots are connected, this requre the use of several PAR registers
	 */

	/* bring 0x100 - 0x1ef back to ISA using PAR5 */
	sc520_mmcr->par[5] = 0x30ef0100;

	/* IDE use 1f0-1f7 */

	/* bring 0x1f8 - 0x2f7 back to ISA using PAR6 */
	sc520_mmcr->par[6] = 0x30ff01f8;

	/* com2 use 2f8-2ff */

	/* bring 0x300 - 0x3af back to ISA using PAR7 */
	sc520_mmcr->par[7] = 0x30af0300;

	/* vga use 3b0-3bb */

	/* bring 0x3bc - 0x3bf back to ISA using PAR8 */
	sc520_mmcr->par[8] = 0x300303bc;

	/* vga use 3c0-3df */

	/* bring 0x3e0 - 0x3f5 back to ISA using PAR9 */
	sc520_mmcr->par[9] = 0x301503e0;

	/* ide use 3f6 */

	/* bring 0x3f7  back to ISA using PAR10 */
	sc520_mmcr->par[10] = 0x300003f7;

	/* com1 use 3f8-3ff */

	return 0;
}