freebsd-dev/sys/arm/allwinner/a20/a20_cpu_cfg.c
Emmanuel Vadot cfc8861b06 allwinner: Rework the BUS_PASS on drivers
- Put all clock and control unit driver in BUS_PASS_RESOURCE except
  for the DE2 CCU as it needs the main CCU to be available.
- Use BUS_PASS_CPU for a20_cpu_cfg as it makes more sense.
- For aw_syscon use SCHEDULER pass as we need it early for drivers
  that attach in BUS_PASS_SUPPORTDEV
- For the rest we can use BUS_PASS_SUPPORTDEV
2019-08-10 17:58:30 +00:00

140 lines
3.8 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org>
* 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.
*
* 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.
*/
/* CPU configuration module for Allwinner A20 */
#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>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <sys/timeet.h>
#include <sys/timetc.h>
#include <sys/watchdog.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/intr.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <machine/bus.h>
#include "a20_cpu_cfg.h"
struct a20_cpu_cfg_softc {
struct resource *res;
bus_space_tag_t bst;
bus_space_handle_t bsh;
};
static struct a20_cpu_cfg_softc *a20_cpu_cfg_sc = NULL;
#define cpu_cfg_read_4(sc, reg) \
bus_space_read_4((sc)->bst, (sc)->bsh, (reg))
#define cpu_cfg_write_4(sc, reg, val) \
bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val))
static int
a20_cpu_cfg_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_is_compatible(dev, "allwinner,sun7i-cpu-cfg")) {
device_set_desc(dev, "A20 CPU Configuration Module");
return(BUS_PROBE_DEFAULT);
}
return (ENXIO);
}
static int
a20_cpu_cfg_attach(device_t dev)
{
struct a20_cpu_cfg_softc *sc = device_get_softc(dev);
int rid = 0;
if (a20_cpu_cfg_sc)
return (ENXIO);
sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
if (!sc->res) {
device_printf(dev, "could not allocate resource\n");
return (ENXIO);
}
sc->bst = rman_get_bustag(sc->res);
sc->bsh = rman_get_bushandle(sc->res);
a20_cpu_cfg_sc = sc;
return (0);
}
static device_method_t a20_cpu_cfg_methods[] = {
DEVMETHOD(device_probe, a20_cpu_cfg_probe),
DEVMETHOD(device_attach, a20_cpu_cfg_attach),
{ 0, 0 }
};
static driver_t a20_cpu_cfg_driver = {
"a20_cpu_cfg",
a20_cpu_cfg_methods,
sizeof(struct a20_cpu_cfg_softc),
};
static devclass_t a20_cpu_cfg_devclass;
EARLY_DRIVER_MODULE(a20_cpu_cfg, simplebus, a20_cpu_cfg_driver, a20_cpu_cfg_devclass, 0, 0,
BUS_PASS_CPU + BUS_PASS_ORDER_FIRST);
uint64_t
a20_read_counter64(void)
{
uint32_t lo, hi;
/* Latch counter, wait for it to be ready to read. */
cpu_cfg_write_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG, CNT64_RL_EN);
while (cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG) & CNT64_RL_EN)
continue;
hi = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_HIGH_REG);
lo = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_LOW_REG);
return (((uint64_t)hi << 32) | lo);
}