freebsd-dev/sys/arm/xscale/i80321/i80321.c

/*	$NetBSD: i80321.c,v 1.15 2003/10/06 16:06:05 thorpej Exp $	*/

/*-
 * Copyright (c) 2002 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
 *
 * 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 for the NetBSD Project by
 *	Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
 * 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.
 */

/*
 * Autoconfiguration support for the Intel i80321 I/O Processor.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>

#define	_ARM32_BUS_DMA_PRIVATE
#include <machine/bus.h>
#include <machine/intr.h>

#include <arm/xscale/i80321/i80321reg.h>
#include <arm/xscale/i80321/i80321var.h>
#include <arm/xscale/i80321/i80321_intr.h>

#include <dev/pci/pcireg.h>

volatile uint32_t intr_enabled;
uint32_t intr_steer = 0;
/*
 * Statically-allocated bus_space stucture used to access the
 * i80321's own registers.
 */
struct bus_space i80321_bs_tag;

/*
 * There can be only one i80321, so we keep a global pointer to
 * the softc, so board-specific code can use features of the
 * i80321 without having to have a handle on the softc itself.
 */
struct i80321_softc *i80321_softc;

#define PCI_MAPREG_MEM_ADDR(x) ((x) & 0xfffffff0)
/*
 * i80321_attach:
 *
 *	Board-independent attach routine for the i80321.
 */
void
i80321_attach(struct i80321_softc *sc)
{

	i80321_softc = sc;
	uint32_t preg;

	/* We expect the Memory Controller to be already sliced off. */

	/*
	 * Program the Inbound windows.
	 */
	bus_space_write_4(sc->sc_st, sc->sc_atu_sh, ATU_IALR0,
	    (0xffffffff - (sc->sc_iwin[0].iwin_size - 1)) & 0xffffffc0);
	bus_space_write_4(sc->sc_st, sc->sc_atu_sh, ATU_IATVR0,
	    sc->sc_iwin[0].iwin_xlate);
	if (sc->sc_is_host) {
		bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
		    PCIR_BARS, sc->sc_iwin[0].iwin_base_lo);
		bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
		    PCIR_BARS + 0x04, sc->sc_iwin[0].iwin_base_hi);
	} else {
		sc->sc_iwin[0].iwin_base_lo = bus_space_read_4(sc->sc_st,
		    sc->sc_atu_sh, PCIR_BARS);
		sc->sc_iwin[0].iwin_base_hi = bus_space_read_4(sc->sc_st,
		    sc->sc_atu_sh, PCIR_BARS + 0x04);
		sc->sc_iwin[0].iwin_base_lo =
		    PCI_MAPREG_MEM_ADDR(sc->sc_iwin[0].iwin_base_lo);
	}

	bus_space_write_4(sc->sc_st, sc->sc_atu_sh, ATU_IALR1,
	    (0xffffffff - (sc->sc_iwin[1].iwin_size - 1)) & 0xffffffc0);

	/* no xlate for window 1 */
	if (sc->sc_is_host) {
		bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
		    PCIR_BARS + 0x08, sc->sc_iwin[1].iwin_base_lo);
		bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
		    PCIR_BARS + 0x0c, sc->sc_iwin[1].iwin_base_hi);
	} else {
		sc->sc_iwin[1].iwin_base_lo = bus_space_read_4(sc->sc_st,
		    sc->sc_atu_sh, PCIR_BARS + 0x08);
		sc->sc_iwin[1].iwin_base_hi = bus_space_read_4(sc->sc_st,
		    sc->sc_atu_sh, PCIR_BARS + 0x0c);
		sc->sc_iwin[1].iwin_base_lo =
		    PCI_MAPREG_MEM_ADDR(sc->sc_iwin[1].iwin_base_lo);
	}

	bus_space_write_4(sc->sc_st, sc->sc_atu_sh, ATU_IALR2,
	    (0xffffffff - (sc->sc_iwin[2].iwin_size - 1)) & 0xffffffc0);
	bus_space_write_4(sc->sc_st, sc->sc_atu_sh, ATU_IATVR2,
	    sc->sc_iwin[2].iwin_xlate);

	if (sc->sc_is_host) {
		bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
		    PCIR_BARS + 0x10, sc->sc_iwin[2].iwin_base_lo);
		bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
		    PCIR_BARS + 0x14, sc->sc_iwin[2].iwin_base_hi);
	} else {
		sc->sc_iwin[2].iwin_base_lo = bus_space_read_4(sc->sc_st,
		    sc->sc_atu_sh, PCIR_BARS + 0x10);
		sc->sc_iwin[2].iwin_base_hi = bus_space_read_4(sc->sc_st,
		    sc->sc_atu_sh, PCIR_BARS + 0x14);
		sc->sc_iwin[2].iwin_base_lo =
		    PCI_MAPREG_MEM_ADDR(sc->sc_iwin[2].iwin_base_lo);
	}
	bus_space_write_4(sc->sc_st, sc->sc_atu_sh, ATU_IALR3,
	    (0xffffffff - (sc->sc_iwin[3].iwin_size - 1)) & 0xffffffc0);
	bus_space_write_4(sc->sc_st, sc->sc_atu_sh, ATU_IATVR3,
	    sc->sc_iwin[3].iwin_xlate);

	if (sc->sc_is_host) {
		bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
		    ATU_IABAR3, sc->sc_iwin[3].iwin_base_lo);
		bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
		    ATU_IAUBAR3, sc->sc_iwin[3].iwin_base_hi);
	} else {
		sc->sc_iwin[3].iwin_base_lo = bus_space_read_4(sc->sc_st,
		    sc->sc_atu_sh, ATU_IABAR3);
		sc->sc_iwin[3].iwin_base_hi = bus_space_read_4(sc->sc_st,
		    sc->sc_atu_sh, ATU_IAUBAR3);
		sc->sc_iwin[3].iwin_base_lo =
		    PCI_MAPREG_MEM_ADDR(sc->sc_iwin[3].iwin_base_lo);
	}
	/*
	 * Mask (disable) the ATU interrupt sources.
	 * XXX May want to revisit this if we encounter
	 * XXX an application that wants it.
	 */
	bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
	    ATU_ATUIMR,
	    ATUIMR_IMW1BU|ATUIMR_ISCEM|ATUIMR_RSCEM|ATUIMR_PST|
	    ATUIMR_DPE|ATUIMR_P_SERR_ASRT|ATUIMR_PMA|ATUIMR_PTAM|
	    ATUIMR_PTAT|ATUIMR_PMPE);

	/*
	 * Program the outbound windows.
	 */
	bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
	    ATU_OIOWTVR, sc->sc_ioout_xlate);

	if (!sc->sc_is_host) {
		sc->sc_owin[0].owin_xlate_lo = sc->sc_iwin[1].iwin_base_lo;
		sc->sc_owin[0].owin_xlate_hi = sc->sc_iwin[1].iwin_base_hi;
	}
	bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
	    ATU_OMWTVR0, sc->sc_owin[0].owin_xlate_lo);
	bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
	    ATU_OUMWTVR0, sc->sc_owin[0].owin_xlate_hi);

	bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
	    ATU_OMWTVR1, sc->sc_owin[1].owin_xlate_lo);
	bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
	    ATU_OUMWTVR1, sc->sc_owin[1].owin_xlate_hi);

	/*
	 * Set up the ATU configuration register.  All we do
	 * right now is enable Outbound Windows.
	 */
	bus_space_write_4(sc->sc_st, sc->sc_atu_sh, ATU_ATUCR,
	    ATUCR_OUT_EN);

	/*
	 * Enable bus mastering, memory access, SERR, and parity
	 * checking on the ATU.
	 */
	if (sc->sc_is_host) {
		preg = bus_space_read_4(sc->sc_st, sc->sc_atu_sh,
		    PCIR_COMMAND);
		preg |= PCIM_CMD_MEMEN |
		    PCIM_CMD_BUSMASTEREN | PCIM_CMD_PERRESPEN |
		    PCIM_CMD_SERRESPEN;
		bus_space_write_4(sc->sc_st, sc->sc_atu_sh,
		    PCIR_COMMAND, preg);
	}
	/* Initialize the bus space tags. */
	i80321_io_bs_init(&sc->sc_pci_iot, sc);
	i80321_mem_bs_init(&sc->sc_pci_memt, sc);
	intr_enabled = 0;
	i80321_set_intrmask();
	i80321_set_intrsteer();
}


static __inline uint32_t
i80321_iintsrc_read(void)
{
	uint32_t iintsrc;
		
	__asm __volatile("mrc p6, 0, %0, c8, c0, 0"
	    : "=r" (iintsrc));
	
	/*
	 * The IINTSRC register shows bits that are active even
	 * if they are masked in INTCTL, so we have to mask them
	 * off with the interrupts we consider enabled.
	 */
	return (iintsrc & intr_enabled);
}

int
arm_get_next_irq(int last __unused)
{
	int irq;

	if ((irq = i80321_iintsrc_read()))
		return (ffs(irq) - 1);
	return (-1);
}