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/* $NetBSD: apple_pmgr.c,v 1.2 2022/05/10 08:10:28 skrll Exp $ */
/*-
* Copyright (c) 2022 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Nick Hudson
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: apple_pmgr.c,v 1.2 2022/05/10 08:10:28 skrll Exp $");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kmem.h>
#include <sys/queue.h>
#include <libfdt.h>
#include <dev/fdt/fdtvar.h>
/*
* Power manager registers
*/
#define PMGR_PS_TARGET_MASK __BITS(3, 0)
#define PMGR_PS_ACTUAL_MASK __BITS(7, 4)
#define PMGR_PS_ACTIVE 0xf
#define PMGR_PS_PWRGATE 0x0
struct apple_pmgr_softc {
device_t sc_dev;
bus_space_tag_t sc_bst;
bus_space_handle_t sc_bsh;
};
#define PMGR_READ(sc, reg) \
bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
#define PMGR_WRITE(sc, reg, val) \
bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
static const struct device_compatible_entry compat_data[] = {
{ .compat = "apple,pmgr" },
DEVICE_COMPAT_EOL
};
static void
apple_pmgr_enable(device_t dev, const uint32_t *data, bool enable)
{
struct apple_pmgr_softc * const sc = device_private(dev);
const uint32_t pstate = enable ? PMGR_PS_ACTIVE : PMGR_PS_PWRGATE;
const int phandle = fdtbus_get_phandle_from_native(be32dec(data));
fdtbus_powerdomain_enable(phandle);
bus_size_t off;
bus_size_t size;
if (fdtbus_get_reg(phandle, 0, &off, &size) != 0 || size != 4) {
aprint_error(": invalid 'reg' property\n");
return;
}
uint32_t val = PMGR_READ(sc, off);
val &= ~PMGR_PS_TARGET_MASK;
val |= __SHIFTIN(pstate, PMGR_PS_TARGET_MASK);
PMGR_WRITE(sc, off, val);
for (int timo = 0; timo < 100; timo++) {
val = PMGR_READ(sc, off);
if (__SHIFTOUT(val, PMGR_PS_ACTUAL_MASK) == pstate)
break;
delay(1);
}
}
static int
apple_pmgr_match(device_t parent, cfdata_t cf, void *aux)
{
struct fdt_attach_args * const faa = aux;
return of_compatible_match(faa->faa_phandle, compat_data);
}
static void
apple_pmgr_attach(device_t parent, device_t self, void *aux)
{
struct apple_pmgr_softc * const sc = device_private(self);
struct fdt_attach_args * const faa = aux;
const int phandle = faa->faa_phandle;
bus_addr_t pmgr_addr;
bus_size_t pmgr_size;
int error = fdtbus_get_reg(phandle, 0, &pmgr_addr, &pmgr_size);
if (error) {
aprint_error(": couldn't get registers\n");
return;
}
sc->sc_dev = self;
sc->sc_bst = faa->faa_bst;
error = bus_space_map(faa->faa_bst, pmgr_addr, pmgr_size, 0,
&sc->sc_bsh);
if (error) {
aprint_error(": couldn't map registers: %d\n", error);
return;
}
aprint_naive("\n");
aprint_normal(": Apple PMGR\n");
for (int node = OF_child(phandle); node; node = OF_peer(node)) {
static const struct device_compatible_entry compat_ps[] = {
{ .compat = "apple,pmgr-pwrstate" },
DEVICE_COMPAT_EOL
};
if (!of_compatible_match(node, compat_ps))
continue;
static struct fdtbus_powerdomain_controller_func funcs = {
.pdc_enable = apple_pmgr_enable,
};
fdtbus_register_powerdomain_controller(self, node, &funcs);
}
}
CFATTACH_DECL_NEW(apple_pmgr, sizeof(struct apple_pmgr_softc),
apple_pmgr_match, apple_pmgr_attach, NULL, NULL);
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