freebsd-dev/sys/arm/mv/mv_ap806_clock.c
Emmanuel Vadot e1453c9e4c arm64: marvell: Add driver for Marvell Ap806 System Controller
The first two clocks are for the clusters and their frequencies can be
found reading a register. Then a fixed 1200Mhz clock is present and two
fixed clocks, 'mss' which is 1200 / 6 and 'sdio' which is 1200 / 3.

Sponsored by:	Rubicon Communications, LLC ("Netgate")
2018-12-12 22:01:06 +00:00

211 lines
5.3 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2018 Rubicon Communications, LLC (Netgate)
*
* 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.
*
* $FreeBSD$
*/
#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/rman.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <machine/intr.h>
#include <dev/fdt/simplebus.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/extres/clk/clk_fixed.h>
static struct clk_fixed_def ap806_clk_cluster_0 = {
.clkdef.id = 0,
.clkdef.name = "ap806-cpu-cluster-0",
.freq = 0,
};
static struct clk_fixed_def ap806_clk_cluster_1 = {
.clkdef.id = 1,
.clkdef.name = "ap806-cpu-cluster-1",
.freq = 0,
};
static struct clk_fixed_def ap806_clk_fixed = {
.clkdef.id = 2,
.clkdef.name = "ap806-fixed",
.freq = 1200000000,
};
/* Thoses are the only exported clocks AFAICT */
static const char *mss_parents[] = {"ap806-fixed"};
static struct clk_fixed_def ap806_clk_mss = {
.clkdef.id = 3,
.clkdef.name = "ap806-mss",
.clkdef.parent_names = mss_parents,
.clkdef.parent_cnt = 1,
.mult = 1,
.div = 6,
};
static const char *sdio_parents[] = {"ap806-fixed"};
static struct clk_fixed_def ap806_clk_sdio = {
.clkdef.id = 4,
.clkdef.name = "ap806-sdio",
.clkdef.parent_names = sdio_parents,
.clkdef.parent_cnt = 1,
.mult = 1,
.div = 3,
};
struct mv_ap806_clock_softc {
struct simplebus_softc simplebus_sc;
device_t dev;
struct resource *res;
};
static struct resource_spec mv_ap806_clock_res_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE | RF_SHAREABLE },
{ -1, 0 }
};
static struct ofw_compat_data compat_data[] = {
{"marvell,ap806-clock", 1},
{NULL, 0}
};
#define RD4(sc, reg) bus_read_4((sc)->res, (reg))
#define WR4(sc, reg, val) bus_write_4((sc)->res, (reg), (val))
static int
mv_ap806_clock_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
return (ENXIO);
device_set_desc(dev, "Marvell AP806 Clock Controller");
return (BUS_PROBE_DEFAULT);
}
static int
mv_ap806_clock_attach(device_t dev)
{
struct mv_ap806_clock_softc *sc;
struct clkdom *clkdom;
uint64_t clock_freq;
uint32_t reg;
sc = device_get_softc(dev);
sc->dev = dev;
if (bus_alloc_resources(dev, mv_ap806_clock_res_spec, &sc->res) != 0) {
device_printf(dev, "cannot allocate resources for device\n");
return (ENXIO);
}
/*
* We might miss some combinations
* Those are the only possible ones on the mcbin
*/
reg = RD4(sc, 0x400);
switch (reg & 0x1f) {
case 0x0:
case 0x1:
clock_freq = 2000000000;
break;
case 0x6:
clock_freq = 1800000000;
break;
case 0xd:
clock_freq = 1600000000;
break;
case 0x14:
clock_freq = 1333000000;
break;
default:
device_printf(dev, "Cannot guess clock freq with reg %x\n", reg & 0x1f);
return (ENXIO);
break;
};
ap806_clk_cluster_0.freq = clock_freq;
ap806_clk_cluster_1.freq = clock_freq;
clkdom = clkdom_create(dev);
clknode_fixed_register(clkdom, &ap806_clk_cluster_0);
clknode_fixed_register(clkdom, &ap806_clk_cluster_1);
clknode_fixed_register(clkdom, &ap806_clk_fixed);
clknode_fixed_register(clkdom, &ap806_clk_mss);
clknode_fixed_register(clkdom, &ap806_clk_sdio);
clkdom_finit(clkdom);
if (bootverbose)
clkdom_dump(clkdom);
return (0);
}
static int
mv_ap806_clock_detach(device_t dev)
{
return (EBUSY);
}
static device_method_t mv_ap806_clock_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, mv_ap806_clock_probe),
DEVMETHOD(device_attach, mv_ap806_clock_attach),
DEVMETHOD(device_detach, mv_ap806_clock_detach),
DEVMETHOD_END
};
static devclass_t mv_ap806_clock_devclass;
static driver_t mv_ap806_clock_driver = {
"mv_ap806_clock",
mv_ap806_clock_methods,
sizeof(struct mv_ap806_clock_softc),
};
EARLY_DRIVER_MODULE(mv_ap806_clock, simplebus, mv_ap806_clock_driver,
mv_ap806_clock_devclass, 0, 0, BUS_PASS_RESOURCE + BUS_PASS_ORDER_LATE);