NetBSD-5.0.2/sys/arch/prep/pci/prep_pciconf_direct.c
/* $NetBSD: prep_pciconf_direct.c,v 1.6 2007/10/17 19:56:52 garbled Exp $ */
/*
* Copyright (c) 2002 Klaus J. Klein. All rights reserved.
* Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
* Copyright (c) 1994 Charles M. Hannum. All rights reserved.
*
* 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 Charles M. Hannum.
* 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.
*/
/*
* Machine-specific functions for PCI autoconfiguration.
*
* This version is specific to the direct-mapped configuration space access
* such as implemented on the IBM 27-82650 PCI Bridge/Memory Controller.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: prep_pciconf_direct.c,v 1.6 2007/10/17 19:56:52 garbled Exp $");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <uvm/uvm_extern.h>
#define _POWERPC_BUS_DMA_PRIVATE
#include <machine/bus.h>
#include <machine/intr.h>
#include <machine/platform.h>
#include <powerpc/pio.h>
#include <dev/isa/isavar.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>
#include <prop/proplib.h>
#ifdef DEBUG
#define DPRINTF(x) aprint_debug x
#else
#define DPRINTF(x)
#endif
/* Physical base address and size of PCI configuration space. */
#define PCI_DCONF_BASE 0x80800000
#define PCI_DCONF_SIZE 0x00800000
/* Device function selection. */
#define PCI_DCONF_FUNC 0x00000700
#define PCI_DCONF_FUNC_SHIFT 8
/* Configuration space register selection. */
#define PCI_DCONF_REG 0x000000ff
#define PCI_DCONF_REG_SHIFT 0
/* Device selection; those bits still available. */
#define PCI_DCONF_DEV \
(~(~(PCI_DCONF_SIZE - 1) | PCI_DCONF_FUNC | PCI_DCONF_REG))
void prep_pci_direct_attach_hook(struct device *, struct device *,
struct pcibus_attach_args *);
pcitag_t prep_pci_direct_make_tag(void *, int, int, int);
pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int);
void prep_pci_direct_conf_write(void *, pcitag_t, int, pcireg_t);
void prep_pci_direct_decompose_tag(void *, pcitag_t, int *, int *, int *);
void
prep_pci_get_chipset_tag_direct(pci_chipset_tag_t pc)
{
pc->pc_conf_v = NULL;
pc->pc_attach_hook = prep_pci_direct_attach_hook;
pc->pc_bus_maxdevs = prep_pci_bus_maxdevs;
pc->pc_make_tag = prep_pci_direct_make_tag;
pc->pc_conf_read = prep_pci_direct_conf_read;
pc->pc_conf_write = prep_pci_direct_conf_write;
pc->pc_intr_v = NULL;
pc->pc_intr_map = prep_pci_intr_map;
pc->pc_intr_string = genppc_pci_intr_string;
pc->pc_intr_evcnt = genppc_pci_intr_evcnt;
pc->pc_intr_establish = genppc_pci_intr_establish;
pc->pc_intr_disestablish = genppc_pci_intr_disestablish;
pc->pc_conf_interrupt = genppc_pci_conf_interrupt;
pc->pc_decompose_tag = prep_pci_direct_decompose_tag;
pc->pc_conf_hook = prep_pci_conf_hook;
}
void
prep_pci_direct_attach_hook(struct device *parent, struct device *self,
struct pcibus_attach_args *pba)
{
if (pba->pba_bus == 0)
aprint_normal(": direct-mapped configuration space access");
}
pcitag_t
prep_pci_direct_make_tag(void *v, int bus, int device, int function)
{
pcitag_t tag;
if (bus >= 256 || device >= 32 || function >= 8)
panic("prep_pci_direct_make_tag: bad request");
tag = (bus << 16) | (device << 11) | (function << 8);
return tag;
}
void
prep_pci_direct_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;
return;
}
pcireg_t
prep_pci_direct_conf_read(void *v, pcitag_t tag, int reg)
{
pcireg_t data;
int bus, device, function;
int s;
prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function);
if (bus == 0) {
/* Check if device selector is within selector range. */
if (1 << device & ~PCI_DCONF_DEV) {
data = ~0;
goto out;
}
tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT);
}
s = splhigh();
data = in32rb(PCI_DCONF_BASE | tag | reg);
splx(s);
out:
return data;
}
void
prep_pci_direct_conf_write(void *v, pcitag_t tag, int reg, pcireg_t data)
{
int bus, device, function;
int s;
DPRINTF(("prep_pci_direct_conf_write(0x%lx, 0x%x, 0x%02x, 0x%08lx) ",
(unsigned long)v, tag, reg, (unsigned long)data));
prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function);
if (bus == 0) {
/* Check if device selector is within selector range. */
if (1 << device & ~PCI_DCONF_DEV) {
/* Should never happen. */
panic("prep_pci_direct_conf_write: bad device %d",
device);
}
tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT);
}
s = splhigh();
out32rb(PCI_DCONF_BASE | tag | reg, data);
splx(s);
}