freebsd-dev/sys/dev/pci/pci_host_generic.c

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/*-
* Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
* Copyright (c) 2014 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Semihalf under
* the sponsorship of the FreeBSD Foundation.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
/* Generic ECAM PCIe driver */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_platform.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/rman.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcib_private.h>
#include <dev/pci/pci_host_generic.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include "pcib_if.h"
/* Assembling ECAM Configuration Address */
#define PCIE_BUS_SHIFT 20
#define PCIE_SLOT_SHIFT 15
#define PCIE_FUNC_SHIFT 12
#define PCIE_BUS_MASK 0xFF
#define PCIE_SLOT_MASK 0x1F
#define PCIE_FUNC_MASK 0x07
#define PCIE_REG_MASK 0xFFF
#define PCIE_ADDR_OFFSET(bus, slot, func, reg) \
((((bus) & PCIE_BUS_MASK) << PCIE_BUS_SHIFT) | \
(((slot) & PCIE_SLOT_MASK) << PCIE_SLOT_SHIFT) | \
(((func) & PCIE_FUNC_MASK) << PCIE_FUNC_SHIFT) | \
((reg) & PCIE_REG_MASK))
/* Forward prototypes */
static uint32_t generic_pcie_read_config(device_t dev, u_int bus, u_int slot,
u_int func, u_int reg, int bytes);
static void generic_pcie_write_config(device_t dev, u_int bus, u_int slot,
u_int func, u_int reg, uint32_t val, int bytes);
static int generic_pcie_maxslots(device_t dev);
static int generic_pcie_read_ivar(device_t dev, device_t child, int index,
uintptr_t *result);
static int generic_pcie_write_ivar(device_t dev, device_t child, int index,
uintptr_t value);
int
pci_host_generic_core_attach(device_t dev)
{
struct generic_pcie_core_softc *sc;
int error;
int rid;
sc = device_get_softc(dev);
sc->dev = dev;
/* Create the parent DMA tag to pass down the coherent flag */
error = bus_dma_tag_create(bus_get_dma_tag(dev), /* parent */
1, 0, /* alignment, bounds */
BUS_SPACE_MAXADDR, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
BUS_SPACE_MAXSIZE, /* maxsize */
BUS_SPACE_UNRESTRICTED, /* nsegments */
BUS_SPACE_MAXSIZE, /* maxsegsize */
sc->coherent ? BUS_DMA_COHERENT : 0, /* flags */
NULL, NULL, /* lockfunc, lockarg */
&sc->dmat);
if (error != 0)
return (error);
rid = 0;
sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
if (sc->res == NULL) {
device_printf(dev, "could not map memory.\n");
return (ENXIO);
}
sc->bst = rman_get_bustag(sc->res);
sc->bsh = rman_get_bushandle(sc->res);
sc->mem_rman.rm_type = RMAN_ARRAY;
sc->mem_rman.rm_descr = "PCIe Memory";
sc->io_rman.rm_type = RMAN_ARRAY;
sc->io_rman.rm_descr = "PCIe IO window";
/* Initialize rman and allocate memory regions */
error = rman_init(&sc->mem_rman);
if (error) {
device_printf(dev, "rman_init() failed. error = %d\n", error);
return (error);
}
error = rman_init(&sc->io_rman);
if (error) {
device_printf(dev, "rman_init() failed. error = %d\n", error);
return (error);
}
return (0);
}
static uint32_t
generic_pcie_read_config(device_t dev, u_int bus, u_int slot,
u_int func, u_int reg, int bytes)
{
struct generic_pcie_core_softc *sc;
bus_space_handle_t h;
bus_space_tag_t t;
uint64_t offset;
uint32_t data;
if ((bus > PCI_BUSMAX) || (slot > PCI_SLOTMAX) ||
(func > PCI_FUNCMAX) || (reg > PCIE_REGMAX))
return (~0U);
sc = device_get_softc(dev);
offset = PCIE_ADDR_OFFSET(bus, slot, func, reg);
t = sc->bst;
h = sc->bsh;
switch (bytes) {
case 1:
data = bus_space_read_1(t, h, offset);
break;
case 2:
data = le16toh(bus_space_read_2(t, h, offset));
break;
case 4:
data = le32toh(bus_space_read_4(t, h, offset));
break;
default:
return (~0U);
}
return (data);
}
static void
generic_pcie_write_config(device_t dev, u_int bus, u_int slot,
u_int func, u_int reg, uint32_t val, int bytes)
{
struct generic_pcie_core_softc *sc;
bus_space_handle_t h;
bus_space_tag_t t;
uint64_t offset;
if ((bus > PCI_BUSMAX) || (slot > PCI_SLOTMAX) ||
(func > PCI_FUNCMAX) || (reg > PCIE_REGMAX))
return;
sc = device_get_softc(dev);
offset = PCIE_ADDR_OFFSET(bus, slot, func, reg);
t = sc->bst;
h = sc->bsh;
switch (bytes) {
case 1:
bus_space_write_1(t, h, offset, val);
break;
case 2:
bus_space_write_2(t, h, offset, htole16(val));
break;
case 4:
bus_space_write_4(t, h, offset, htole32(val));
break;
default:
return;
}
}
static int
generic_pcie_maxslots(device_t dev)
{
return (31); /* max slots per bus acc. to standard */
}
static int
generic_pcie_read_ivar(device_t dev, device_t child, int index,
uintptr_t *result)
{
struct generic_pcie_core_softc *sc;
int secondary_bus;
sc = device_get_softc(dev);
if (index == PCIB_IVAR_BUS) {
/* this pcib adds only pci bus 0 as child */
secondary_bus = 0;
*result = secondary_bus;
return (0);
}
if (index == PCIB_IVAR_DOMAIN) {
*result = sc->ecam;
return (0);
}
if (bootverbose)
device_printf(dev, "ERROR: Unknown index %d.\n", index);
return (ENOENT);
}
static int
generic_pcie_write_ivar(device_t dev, device_t child, int index,
uintptr_t value)
{
return (ENOENT);
}
static struct rman *
generic_pcie_rman(struct generic_pcie_core_softc *sc, int type)
{
switch (type) {
case SYS_RES_IOPORT:
return (&sc->io_rman);
case SYS_RES_MEMORY:
return (&sc->mem_rman);
default:
break;
}
return (NULL);
}
int
pci_host_generic_core_release_resource(device_t dev, device_t child, int type,
int rid, struct resource *res)
{
struct generic_pcie_core_softc *sc;
struct rman *rm;
sc = device_get_softc(dev);
#if defined(NEW_PCIB) && defined(PCI_RES_BUS)
if (type == PCI_RES_BUS) {
return (pci_domain_release_bus(sc->ecam, child, rid, res));
}
#endif
rm = generic_pcie_rman(sc, type);
if (rm != NULL) {
KASSERT(rman_is_region_manager(res, rm), ("rman mismatch"));
rman_release_resource(res);
}
return (bus_generic_release_resource(dev, child, type, rid, res));
}
struct resource *
pci_host_generic_core_alloc_resource(device_t dev, device_t child, int type,
int *rid, rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
struct generic_pcie_core_softc *sc;
struct resource *res;
struct rman *rm;
sc = device_get_softc(dev);
#if defined(NEW_PCIB) && defined(PCI_RES_BUS)
if (type == PCI_RES_BUS) {
return (pci_domain_alloc_bus(sc->ecam, child, rid, start, end,
count, flags));
}
#endif
rm = generic_pcie_rman(sc, type);
if (rm == NULL)
return (BUS_ALLOC_RESOURCE(device_get_parent(dev), dev,
type, rid, start, end, count, flags));
if (bootverbose) {
device_printf(dev,
"rman_reserve_resource: start=%#jx, end=%#jx, count=%#jx\n",
start, end, count);
}
res = rman_reserve_resource(rm, start, end, count, flags, child);
if (res == NULL)
goto fail;
rman_set_rid(res, *rid);
if (flags & RF_ACTIVE)
if (bus_activate_resource(child, type, *rid, res)) {
rman_release_resource(res);
goto fail;
}
return (res);
fail:
device_printf(dev, "%s FAIL: type=%d, rid=%d, "
"start=%016jx, end=%016jx, count=%016jx, flags=%x\n",
__func__, type, *rid, start, end, count, flags);
return (NULL);
}
static int
generic_pcie_adjust_resource(device_t dev, device_t child, int type,
struct resource *res, rman_res_t start, rman_res_t end)
{
struct generic_pcie_core_softc *sc;
struct rman *rm;
sc = device_get_softc(dev);
#if defined(NEW_PCIB) && defined(PCI_RES_BUS)
if (type == PCI_RES_BUS)
return (pci_domain_adjust_bus(sc->ecam, child, res, start,
end));
#endif
rm = generic_pcie_rman(sc, type);
if (rm != NULL)
return (rman_adjust_resource(res, start, end));
return (bus_generic_adjust_resource(dev, child, type, res, start, end));
}
static bus_dma_tag_t
generic_pcie_get_dma_tag(device_t dev, device_t child)
{
struct generic_pcie_core_softc *sc;
sc = device_get_softc(dev);
return (sc->dmat);
}
static device_method_t generic_pcie_methods[] = {
DEVMETHOD(device_attach, pci_host_generic_core_attach),
DEVMETHOD(bus_read_ivar, generic_pcie_read_ivar),
DEVMETHOD(bus_write_ivar, generic_pcie_write_ivar),
DEVMETHOD(bus_alloc_resource, pci_host_generic_core_alloc_resource),
DEVMETHOD(bus_adjust_resource, generic_pcie_adjust_resource),
DEVMETHOD(bus_release_resource, pci_host_generic_core_release_resource),
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
DEVMETHOD(bus_get_dma_tag, generic_pcie_get_dma_tag),
/* pcib interface */
DEVMETHOD(pcib_maxslots, generic_pcie_maxslots),
DEVMETHOD(pcib_read_config, generic_pcie_read_config),
DEVMETHOD(pcib_write_config, generic_pcie_write_config),
DEVMETHOD_END
};
DEFINE_CLASS_0(pcib, generic_pcie_core_driver,
generic_pcie_methods, sizeof(struct generic_pcie_core_softc));