OpenGrok

/*	$NetBSD: i80312_pci.c,v 1.20 2022/09/27 06:36:43 skrll Exp $	*/

/*
 * Copyright (c) 2001 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.
 */

/*
 * PCI configuration support for i80312 Companion I/O chip.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: i80312_pci.c,v 1.20 2022/09/27 06:36:43 skrll Exp $");

#include "opt_pci.h"
#include "pci.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/bus.h>

#include <uvm/uvm_extern.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/pciconf.h>
#include <dev/pci/ppbreg.h>

#include <arm/locore.h>

#include <arm/xscale/i80312reg.h>
#include <arm/xscale/i80312var.h>

void		i80312_pci_attach_hook(device_t, device_t,
		    struct pcibus_attach_args *);
int		i80312_pci_bus_maxdevs(void *, int);
pcitag_t	i80312_pci_make_tag(void *, int, int, int);
void		i80312_pci_decompose_tag(void *, pcitag_t, int *, int *,
		    int *);
pcireg_t	i80312_pci_conf_read(void *, pcitag_t, int);
void		i80312_pci_conf_write(void *, pcitag_t, int, pcireg_t);
void		i80312_pci_conf_interrupt(void *, int, int, int, int, int *);

#define	PCI_CONF_LOCK(s)	(s) = disable_interrupts(I32_bit)
#define	PCI_CONF_UNLOCK(s)	restore_interrupts((s))

void
i80312_pci_init(pci_chipset_tag_t pc, void *cookie)
{
#if NPCI > 0 && defined(PCI_NETBSD_CONFIGURE)
	struct i80312_softc *sc = cookie;
	struct pciconf_resources *pcires;
	pcireg_t binfo;
	int sbus;
#endif

	pc->pc_conf_v = cookie;
	pc->pc_attach_hook = i80312_pci_attach_hook;
	pc->pc_bus_maxdevs = i80312_pci_bus_maxdevs;
	pc->pc_make_tag = i80312_pci_make_tag;
	pc->pc_decompose_tag = i80312_pci_decompose_tag;
	pc->pc_conf_read = i80312_pci_conf_read;
	pc->pc_conf_write = i80312_pci_conf_write;
	pc->pc_conf_interrupt = i80312_pci_conf_interrupt;

#if NPCI > 0 && defined(PCI_NETBSD_CONFIGURE)
	/*
	 * Configure the PCI bus.
	 *
	 * XXX We need to revisit this.  We only configure the Secondary
	 * bus (and its children).  The bus configure code needs changes
	 * to support how the busses are arranged on this chip.  We also
	 * need to only configure devices in the private device space on
	 * the Secondary bus.
	 */

	binfo = bus_space_read_4(sc->sc_st, sc->sc_ppb_sh, PCI_BRIDGE_BUS_REG);
	/* pbus = PCI_BRIDGE_BUS_NUM_PRIMARY(binfo); */
	sbus = PCI_BRIDGE_BUS_NUM_SECONDARY(binfo);

	pcires = pciconf_resource_init();

	pciconf_resource_add(pcires, PCICONF_RESOURCE_IO,
	    sc->sc_sioout_base, sc->sc_sioout_size);
	pciconf_resource_add(pcires, PCICONF_RESOURCE_MEM,
	    sc->sc_smemout_base, sc->sc_smemout_size);

	aprint_normal_dev(sc->sc_dev, "configuring Secondary PCI bus\n");
	pci_configure_bus(pc, pcires, sbus, arm_dcache_align);

	pciconf_resource_fini(pcires);
#endif
}

void
i80312_pci_conf_interrupt(void *v, int a, int b, int c, int d, int *p)
{
}

void
i80312_pci_attach_hook(device_t parent, device_t self,
    struct pcibus_attach_args *pba)
{

	/* Nothing to do. */
}

int
i80312_pci_bus_maxdevs(void *v, int busno)
{

	return (32);
}

pcitag_t
i80312_pci_make_tag(void *v, int b, int d, int f)
{

	return ((b << 16) | (d << 11) | (f << 8));
}

void
i80312_pci_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp, int *fp)
{

	if (bp != NULL)
		*bp = (tag >> 16) & 0xff;
	if (dp != NULL)
		*dp = (tag >> 11) & 0x1f;
	if (fp != NULL)
		*fp = (tag >> 8) & 0x7;
}

struct pciconf_state {
	bus_addr_t ps_addr_reg;
	bus_addr_t ps_data_reg;
	bus_addr_t ps_csr_reg;
	uint32_t ps_addr_val;

	int ps_b, ps_d, ps_f;
};

static int
i80312_pci_conf_setup(struct i80312_softc *sc, pcitag_t tag, int offset,
    struct pciconf_state *ps)
{
	pcireg_t binfo;
	int pbus, sbus;

	if ((unsigned int)offset >= PCI_CONF_SIZE)
		return (1);

	i80312_pci_decompose_tag(sc, tag, &ps->ps_b, &ps->ps_d, &ps->ps_f);

	binfo = bus_space_read_4(sc->sc_st, sc->sc_ppb_sh, PCI_BRIDGE_BUS_REG);
	pbus = PCI_BRIDGE_BUS_NUM_PRIMARY(binfo);
	sbus = PCI_BRIDGE_BUS_NUM_SECONDARY(binfo);

	/*
	 * If the bus # is the Primary bus #, use the Primary
	 * Address/Data registers, otherwise use the Secondary
	 * Address/Data registers.
	 */
	if (ps->ps_b == pbus) {
		ps->ps_addr_reg = I80312_ATU_POCCA;
		ps->ps_data_reg = I80312_ATU_POCCD;
		ps->ps_csr_reg = PCI_COMMAND_STATUS_REG;
	} else {
		ps->ps_addr_reg = I80312_ATU_SOCCA;
		ps->ps_data_reg = I80312_ATU_SOCCD;
		ps->ps_csr_reg = I80312_ATU_SACS;
	}

	/*
	 * If the bus # is the Primary or Secondary bus #, then use
	 * Type 0 cycles, else use Type 1.
	 *
	 * XXX We should filter out all non-private devices here!
	 * XXX How does private space interact with PCI-PCI bridges?
	 */
	if (ps->ps_b == pbus || ps->ps_b == sbus) {
		if (ps->ps_d > (31 - 11))
			return (1);
		ps->ps_addr_val = (1U << (ps->ps_d + 11)) | (ps->ps_f << 8) |
		    offset;
	} else {
		/* The tag is already in the correct format. */
		ps->ps_addr_val = tag | offset | 1;
	}

	return (0);
}

pcireg_t
i80312_pci_conf_read(void *v, pcitag_t tag, int offset)
{
	struct i80312_softc *sc = v;
	struct pciconf_state ps;
	vaddr_t va;
	pcireg_t rv;
	u_int s;

	if (i80312_pci_conf_setup(sc, tag, offset, &ps))
		return ((pcireg_t) -1);

	PCI_CONF_LOCK(s);

	bus_space_write_4(sc->sc_st, sc->sc_atu_sh, ps.ps_addr_reg,
	    ps.ps_addr_val);

	va = (vaddr_t) bus_space_vaddr(sc->sc_st, sc->sc_atu_sh);
	if (badaddr_read((void *) (va + ps.ps_data_reg), sizeof(rv), &rv)) {
		/*
		 * Clear the Master Abort by reading the PCI
		 * Status Register.
		 */
		(void) bus_space_read_4(sc->sc_st, sc->sc_atu_sh,
		    ps.ps_csr_reg);
#if 0
		printf("conf_read: %d/%d/%d bad address\n",
		    ps.ps_b, ps.ps_d, ps.ps_f);
#endif
		rv = (pcireg_t) -1;
	}

	PCI_CONF_UNLOCK(s);

	return (rv);
}

void
i80312_pci_conf_write(void *v, pcitag_t tag, int offset, pcireg_t val)
{
	struct i80312_softc *sc = v;
	struct pciconf_state ps;
	u_int s;

	if (i80312_pci_conf_setup(sc, tag, offset, &ps))
		return;

	PCI_CONF_LOCK(s);

	bus_space_write_4(sc->sc_st, sc->sc_atu_sh, ps.ps_addr_reg,
	    ps.ps_addr_val);
	bus_space_write_4(sc->sc_st, sc->sc_atu_sh, ps.ps_data_reg, val);

	PCI_CONF_UNLOCK(s);
}