Add cpufreq support on the PowerPC G5, along with a skeleton SMU driver
in order to slew CPU voltage during frequency changes. The OpenBSD SMU driver was an extremely helpful reference for this.
This commit is contained in:
nwhitehorn
parent
abe79136cc
commit
f711522f3c
@ -99,6 +99,7 @@ powerpc/booke/swtch.S optional e500
|
||||
powerpc/booke/trap.c optional e500
|
||||
powerpc/booke/vm_machdep.c optional e500
|
||||
powerpc/cpufreq/dfs.c optional cpufreq
|
||||
powerpc/cpufreq/pcr.c optional cpufreq aim
|
||||
powerpc/fpu/fpu_add.c optional fpu_emu
|
||||
powerpc/fpu/fpu_compare.c optional fpu_emu
|
||||
powerpc/fpu/fpu_div.c optional fpu_emu
|
||||
@ -127,18 +128,19 @@ powerpc/ofw/ofw_syscons.c optional sc aim
|
||||
powerpc/powermac/ata_kauai.c optional powermac ata | powermac atamacio
|
||||
powerpc/powermac/ata_macio.c optional powermac ata | powermac atamacio
|
||||
powerpc/powermac/ata_dbdma.c optional powermac ata | powermac atamacio
|
||||
powerpc/powermac/cuda.c optional powermac cuda
|
||||
powerpc/powermac/cpcht.c optional powermac pci
|
||||
powerpc/powermac/dbdma.c optional powermac pci
|
||||
powerpc/powermac/grackle.c optional powermac pci
|
||||
powerpc/powermac/hrowpic.c optional powermac pci
|
||||
powerpc/powermac/kiic.c optional powermac kiic
|
||||
powerpc/powermac/macgpio.c optional powermac pci
|
||||
powerpc/powermac/macio.c optional powermac pci
|
||||
powerpc/powermac/openpic_macio.c optional powermac pci
|
||||
powerpc/powermac/pswitch.c optional powermac pswitch
|
||||
powerpc/powermac/uninorth.c optional powermac pci
|
||||
powerpc/powermac/cuda.c optional powermac cuda
|
||||
powerpc/powermac/pmu.c optional powermac pmu
|
||||
powerpc/powermac/macgpio.c optional powermac pci
|
||||
powerpc/powermac/cpcht.c optional powermac pci
|
||||
powerpc/powermac/smu.c optional powermac smu
|
||||
powerpc/powermac/uninorth.c optional powermac pci
|
||||
powerpc/powermac/vcoregpio.c optional powermac
|
||||
powerpc/powerpc/altivec.c optional aim
|
||||
powerpc/powerpc/atomic.S standard
|
||||
|
||||
@ -158,6 +158,7 @@ device fwe # Ethernet over FireWire (non-standard!)
|
||||
|
||||
# Misc
|
||||
device powermac_nvram # Open Firmware configuration NVRAM
|
||||
device smu # Apple System Management Unit
|
||||
|
||||
# ADB support
|
||||
device adb
|
||||
|
||||
@ -33,6 +33,7 @@ device ofwd # Open Firmware disks
|
||||
device adb # Apple Desktop Bus
|
||||
device cuda # VIA-CUDA ADB interface
|
||||
device pmu # Apple Power Management Unit
|
||||
device smu # Apple System Management Unit
|
||||
device snd_ai2s # Apple I2S Audio
|
||||
device snd_davbus # Apple Davbus Audio
|
||||
|
||||
|
||||
333
sys/powerpc/cpufreq/pcr.c
Normal file
333
sys/powerpc/cpufreq/pcr.c
Normal file
@ -0,0 +1,333 @@
|
||||
/*-
|
||||
* Copyright (c) 2009 Nathan Whitehorn
|
||||
* 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 ``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.
|
||||
*/
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
__FBSDID("$FreeBSD$");
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/bus.h>
|
||||
#include <sys/cpu.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/module.h>
|
||||
|
||||
#include <dev/ofw/ofw_bus.h>
|
||||
|
||||
#include "cpufreq_if.h"
|
||||
|
||||
struct pcr_softc {
|
||||
device_t dev;
|
||||
uint32_t pcr_vals[3];
|
||||
int nmodes;
|
||||
};
|
||||
|
||||
static void pcr_identify(driver_t *driver, device_t parent);
|
||||
static int pcr_probe(device_t dev);
|
||||
static int pcr_attach(device_t dev);
|
||||
static int pcr_settings(device_t dev, struct cf_setting *sets, int *count);
|
||||
static int pcr_set(device_t dev, const struct cf_setting *set);
|
||||
static int pcr_get(device_t dev, struct cf_setting *set);
|
||||
static int pcr_type(device_t dev, int *type);
|
||||
|
||||
static device_method_t pcr_methods[] = {
|
||||
/* Device interface */
|
||||
DEVMETHOD(device_identify, pcr_identify),
|
||||
DEVMETHOD(device_probe, pcr_probe),
|
||||
DEVMETHOD(device_attach, pcr_attach),
|
||||
|
||||
/* cpufreq interface */
|
||||
DEVMETHOD(cpufreq_drv_set, pcr_set),
|
||||
DEVMETHOD(cpufreq_drv_get, pcr_get),
|
||||
DEVMETHOD(cpufreq_drv_type, pcr_type),
|
||||
DEVMETHOD(cpufreq_drv_settings, pcr_settings),
|
||||
|
||||
{0, 0}
|
||||
};
|
||||
|
||||
static driver_t pcr_driver = {
|
||||
"pcr",
|
||||
pcr_methods,
|
||||
sizeof(struct pcr_softc)
|
||||
};
|
||||
|
||||
static devclass_t pcr_devclass;
|
||||
DRIVER_MODULE(pcr, cpu, pcr_driver, pcr_devclass, 0, 0);
|
||||
|
||||
/*
|
||||
* States
|
||||
*/
|
||||
|
||||
#define PCR_TO_FREQ(a) ((a >> 17) & 3)
|
||||
|
||||
#define PCR_FULL 0
|
||||
#define PCR_HALF 1
|
||||
#define PCR_QUARTER 2 /* Only on 970MP */
|
||||
|
||||
#define PSR_RECEIVED (1ULL << 61)
|
||||
#define PSR_COMPLETED (1ULL << 61)
|
||||
|
||||
/*
|
||||
* SCOM addresses
|
||||
*/
|
||||
|
||||
#define SCOM_PCR 0x0aa00100 /* Power Control Register */
|
||||
#define SCOM_PCR_BIT 0x80000000 /* Data bit for PCR */
|
||||
#define SCOM_PSR 0x40800100 /* Power Status Register */
|
||||
|
||||
/*
|
||||
* SCOM Glue
|
||||
*/
|
||||
|
||||
#define SCOMC_READ 0x00008000
|
||||
#define SCOMC_WRITE 0x00000000
|
||||
|
||||
static void
|
||||
write_scom(register_t address, uint64_t value)
|
||||
{
|
||||
register_t msr;
|
||||
register_t hi, lo, scratch;
|
||||
|
||||
hi = (value >> 32) & 0xffffffff;
|
||||
lo = value & 0xffffffff;
|
||||
|
||||
msr = mfmsr();
|
||||
mtmsr(msr & ~PSL_EE); isync();
|
||||
|
||||
mtspr64(SPR_SCOMD, hi, lo, scratch);
|
||||
isync();
|
||||
mtspr(SPR_SCOMC, address | SCOMC_WRITE);
|
||||
isync();
|
||||
|
||||
mtmsr(msr); isync();
|
||||
}
|
||||
|
||||
static uint64_t
|
||||
read_scom(register_t address)
|
||||
{
|
||||
register_t msr;
|
||||
uint64_t ret;
|
||||
|
||||
msr = mfmsr();
|
||||
mtmsr(msr & ~PSL_EE); isync();
|
||||
|
||||
mtspr(SPR_SCOMC, address | SCOMC_READ);
|
||||
isync();
|
||||
|
||||
__asm __volatile ("mfspr %0,%1;"
|
||||
" mr %0+1, %0; srdi %0,%0,32" : "=r" (ret) : "K" (SPR_SCOMD));
|
||||
|
||||
(void)mfspr(SPR_SCOMC); /* Complete transcation */
|
||||
|
||||
mtmsr(msr); isync();
|
||||
|
||||
return (ret);
|
||||
}
|
||||
|
||||
static void
|
||||
pcr_identify(driver_t *driver, device_t parent)
|
||||
{
|
||||
uint16_t vers;
|
||||
vers = mfpvr() >> 16;
|
||||
|
||||
/* Check for an IBM 970-class CPU */
|
||||
switch (vers) {
|
||||
case IBM970FX:
|
||||
case IBM970GX:
|
||||
case IBM970MP:
|
||||
break;
|
||||
default:
|
||||
return;
|
||||
}
|
||||
|
||||
/* Make sure we're not being doubly invoked. */
|
||||
if (device_find_child(parent, "pcr", -1) != NULL)
|
||||
return;
|
||||
|
||||
/*
|
||||
* We attach a child for every CPU since settings need to
|
||||
* be performed on every CPU in the SMP case.
|
||||
*/
|
||||
if (BUS_ADD_CHILD(parent, 10, "pcr", -1) == NULL)
|
||||
device_printf(parent, "add pcr child failed\n");
|
||||
}
|
||||
|
||||
static int
|
||||
pcr_probe(device_t dev)
|
||||
{
|
||||
if (resource_disabled("pcr", 0))
|
||||
return (ENXIO);
|
||||
|
||||
device_set_desc(dev, "PPC 970 Power Control Register");
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
pcr_attach(device_t dev)
|
||||
{
|
||||
struct pcr_softc *sc;
|
||||
phandle_t cpu;
|
||||
uint32_t modes[3];
|
||||
int i;
|
||||
|
||||
sc = device_get_softc(dev);
|
||||
sc->dev = dev;
|
||||
|
||||
cpu = ofw_bus_get_node(device_get_parent(dev));
|
||||
|
||||
if (cpu <= 0) {
|
||||
device_printf(dev,"No CPU device tree node!\n");
|
||||
return (ENXIO);
|
||||
}
|
||||
|
||||
/*
|
||||
* Collect the PCR values for each mode from the device tree.
|
||||
* These include bus timing information, and so cannot be
|
||||
* directly computed.
|
||||
*/
|
||||
sc->nmodes = OF_getproplen(cpu, "power-mode-data");
|
||||
if (sc->nmodes <= 0 || sc->nmodes > sizeof(sc->pcr_vals)) {
|
||||
device_printf(dev,"No power mode data in device tree!\n");
|
||||
return (ENXIO);
|
||||
}
|
||||
OF_getprop(cpu, "power-mode-data", modes, sc->nmodes);
|
||||
sc->nmodes /= sizeof(modes[0]);
|
||||
|
||||
/* Sort the modes */
|
||||
for (i = 0; i < sc->nmodes; i++)
|
||||
sc->pcr_vals[PCR_TO_FREQ(modes[i])] = modes[i];
|
||||
|
||||
cpufreq_register(dev);
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
pcr_settings(device_t dev, struct cf_setting *sets, int *count)
|
||||
{
|
||||
struct pcr_softc *sc;
|
||||
|
||||
sc = device_get_softc(dev);
|
||||
if (sets == NULL || count == NULL)
|
||||
return (EINVAL);
|
||||
if (*count < sc->nmodes)
|
||||
return (E2BIG);
|
||||
|
||||
/* Return a list of valid settings for this driver. */
|
||||
memset(sets, CPUFREQ_VAL_UNKNOWN, sizeof(*sets) * sc->nmodes);
|
||||
|
||||
sets[0].freq = 10000; sets[0].dev = dev;
|
||||
sets[1].freq = 5000; sets[1].dev = dev;
|
||||
if (sc->nmodes > 2)
|
||||
sets[2].freq = 2500; sets[2].dev = dev;
|
||||
*count = sc->nmodes;
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
pcr_set(device_t dev, const struct cf_setting *set)
|
||||
{
|
||||
struct pcr_softc *sc;
|
||||
register_t pcr, msr;
|
||||
uint64_t psr;
|
||||
|
||||
if (set == NULL)
|
||||
return (EINVAL);
|
||||
sc = device_get_softc(dev);
|
||||
|
||||
/* Construct the new PCR */
|
||||
|
||||
pcr = SCOM_PCR_BIT;
|
||||
|
||||
if (set->freq == 10000)
|
||||
pcr |= sc->pcr_vals[0];
|
||||
else if (set->freq == 5000)
|
||||
pcr |= sc->pcr_vals[1];
|
||||
else if (set->freq == 2500)
|
||||
pcr |= sc->pcr_vals[2];
|
||||
|
||||
msr = mfmsr();
|
||||
mtmsr(msr & ~PSL_EE); isync();
|
||||
|
||||
/* 970MP requires PCR and PCRH to be cleared first */
|
||||
|
||||
write_scom(SCOM_PCR,0); /* Clear PCRH */
|
||||
write_scom(SCOM_PCR,SCOM_PCR_BIT); /* Clear PCR */
|
||||
|
||||
/* Set PCR */
|
||||
|
||||
write_scom(SCOM_PCR, pcr);
|
||||
|
||||
/* Wait for completion */
|
||||
|
||||
do {
|
||||
DELAY(100);
|
||||
psr = read_scom(SCOM_PSR);
|
||||
} while ((psr & PSR_RECEIVED) && !(psr & PSR_COMPLETED));
|
||||
|
||||
mtmsr(msr); isync();
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
pcr_get(device_t dev, struct cf_setting *set)
|
||||
{
|
||||
struct pcr_softc *sc;
|
||||
uint64_t psr;
|
||||
|
||||
if (set == NULL)
|
||||
return (EINVAL);
|
||||
sc = device_get_softc(dev);
|
||||
|
||||
memset(set, CPUFREQ_VAL_UNKNOWN, sizeof(*set));
|
||||
|
||||
psr = read_scom(SCOM_PSR);
|
||||
|
||||
/* We want bits 6 and 7 */
|
||||
psr = (psr >> 56) & 3;
|
||||
|
||||
set->freq = 10000;
|
||||
if (psr == PCR_HALF)
|
||||
set->freq = 5000;
|
||||
else if (psr == PCR_QUARTER)
|
||||
set->freq = 2500;
|
||||
|
||||
set->dev = dev;
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
pcr_type(device_t dev, int *type)
|
||||
{
|
||||
|
||||
if (type == NULL)
|
||||
return (EINVAL);
|
||||
|
||||
*type = CPUFREQ_TYPE_RELATIVE;
|
||||
return (0);
|
||||
}
|
||||
|
||||
288
sys/powerpc/powermac/smu.c
Normal file
288
sys/powerpc/powermac/smu.c
Normal file
@ -0,0 +1,288 @@
|
||||
/*-
|
||||
* Copyright (c) 2009 Nathan Whitehorn
|
||||
* 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 ``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.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
__FBSDID("$FreeBSD$");
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/bus.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/module.h>
|
||||
#include <sys/conf.h>
|
||||
#include <sys/cpu.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/rman.h>
|
||||
#include <sys/sysctl.h>
|
||||
|
||||
#include <machine/bus.h>
|
||||
#include <machine/md_var.h>
|
||||
|
||||
#include <dev/ofw/openfirm.h>
|
||||
#include <dev/ofw/ofw_bus.h>
|
||||
#include <powerpc/powermac/macgpiovar.h>
|
||||
|
||||
struct smu_cmd {
|
||||
uint8_t cmd;
|
||||
uint8_t len;
|
||||
uint8_t data[254];
|
||||
};
|
||||
|
||||
struct smu_softc {
|
||||
device_t sc_dev;
|
||||
struct mtx sc_mtx;
|
||||
|
||||
struct resource *sc_memr;
|
||||
int sc_memrid;
|
||||
|
||||
bus_dma_tag_t sc_dmatag;
|
||||
bus_space_tag_t sc_bt;
|
||||
bus_space_handle_t sc_mailbox;
|
||||
|
||||
struct smu_cmd *sc_cmd;
|
||||
bus_addr_t sc_cmd_phys;
|
||||
bus_dmamap_t sc_cmd_dmamap;
|
||||
};
|
||||
|
||||
/* regular bus attachment functions */
|
||||
|
||||
static int smu_probe(device_t);
|
||||
static int smu_attach(device_t);
|
||||
|
||||
/* cpufreq notification hooks */
|
||||
|
||||
static void smu_cpufreq_pre_change(device_t, const struct cf_level *level);
|
||||
static void smu_cpufreq_post_change(device_t, const struct cf_level *level);
|
||||
|
||||
/* where to find the doorbell GPIO */
|
||||
|
||||
static device_t smu_doorbell = NULL;
|
||||
|
||||
static device_method_t smu_methods[] = {
|
||||
/* Device interface */
|
||||
DEVMETHOD(device_probe, smu_probe),
|
||||
DEVMETHOD(device_attach, smu_attach),
|
||||
{ 0, 0 },
|
||||
};
|
||||
|
||||
static driver_t smu_driver = {
|
||||
"smu",
|
||||
smu_methods,
|
||||
sizeof(struct smu_softc)
|
||||
};
|
||||
|
||||
static devclass_t smu_devclass;
|
||||
|
||||
DRIVER_MODULE(smu, nexus, smu_driver, smu_devclass, 0, 0);
|
||||
|
||||
#define SMU_MAILBOX 0x860c
|
||||
|
||||
/* Command types */
|
||||
#define SMU_POWER 0xaa
|
||||
|
||||
static int
|
||||
smu_probe(device_t dev)
|
||||
{
|
||||
const char *name = ofw_bus_get_name(dev);
|
||||
|
||||
if (strcmp(name, "smu") != 0)
|
||||
return (ENXIO);
|
||||
|
||||
device_set_desc(dev, "Apple System Management Unit");
|
||||
return (0);
|
||||
}
|
||||
|
||||
static void
|
||||
smu_phys_callback(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
|
||||
{
|
||||
struct smu_softc *sc = xsc;
|
||||
|
||||
sc->sc_cmd_phys = segs[0].ds_addr;
|
||||
}
|
||||
|
||||
static int
|
||||
smu_attach(device_t dev)
|
||||
{
|
||||
struct smu_softc *sc;
|
||||
|
||||
sc = device_get_softc(dev);
|
||||
|
||||
mtx_init(&sc->sc_mtx, "smu", NULL, MTX_DEF);
|
||||
|
||||
/*
|
||||
* Map the mailbox area. This should be determined from firmware,
|
||||
* but I have not found a simple way to do that.
|
||||
*/
|
||||
bus_dma_tag_create(NULL, 16, 0, BUS_SPACE_MAXADDR_32BIT,
|
||||
BUS_SPACE_MAXADDR, NULL, NULL, PAGE_SIZE, 1, PAGE_SIZE, 0, NULL,
|
||||
NULL, &(sc->sc_dmatag));
|
||||
sc->sc_bt = &bs_be_tag;
|
||||
bus_space_map(sc->sc_bt, SMU_MAILBOX, 4, 0, &sc->sc_mailbox);
|
||||
|
||||
/*
|
||||
* Allocate the command buffer. This can be anywhere in the low 4 GB
|
||||
* of memory.
|
||||
*/
|
||||
bus_dmamem_alloc(sc->sc_dmatag, (void **)&sc->sc_cmd, BUS_DMA_WAITOK |
|
||||
BUS_DMA_ZERO, &sc->sc_cmd_dmamap);
|
||||
bus_dmamap_load(sc->sc_dmatag, sc->sc_cmd_dmamap,
|
||||
sc->sc_cmd, PAGE_SIZE, smu_phys_callback, sc, 0);
|
||||
|
||||
/*
|
||||
* Set up handlers to change CPU voltage when CPU frequency is changed.
|
||||
*/
|
||||
EVENTHANDLER_REGISTER(cpufreq_pre_change, smu_cpufreq_pre_change, dev,
|
||||
EVENTHANDLER_PRI_ANY);
|
||||
EVENTHANDLER_REGISTER(cpufreq_post_change, smu_cpufreq_post_change, dev,
|
||||
EVENTHANDLER_PRI_ANY);
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
smu_run_cmd(device_t dev, struct smu_cmd *cmd)
|
||||
{
|
||||
struct smu_softc *sc;
|
||||
int doorbell_ack, result;
|
||||
|
||||
sc = device_get_softc(dev);
|
||||
|
||||
mtx_lock(&sc->sc_mtx);
|
||||
|
||||
/* Copy the command to the mailbox */
|
||||
memcpy(sc->sc_cmd, cmd, sizeof(*cmd));
|
||||
bus_dmamap_sync(sc->sc_dmatag, sc->sc_cmd_dmamap, BUS_DMASYNC_PREWRITE);
|
||||
bus_space_write_4(sc->sc_bt, sc->sc_mailbox, 0, sc->sc_cmd_phys);
|
||||
|
||||
/* Invalidate the cacheline it is in -- SMU bypasses the cache */
|
||||
__asm __volatile("dcbst 0,%0; sync" :: "r"(sc->sc_cmd): "memory");
|
||||
|
||||
/* Ring SMU doorbell */
|
||||
macgpio_write(smu_doorbell, GPIO_DDR_OUTPUT);
|
||||
|
||||
/* Wait for the doorbell GPIO to go high, signaling completion */
|
||||
do {
|
||||
/* XXX: timeout */
|
||||
DELAY(50);
|
||||
doorbell_ack = macgpio_read(smu_doorbell);
|
||||
} while (!doorbell_ack);
|
||||
|
||||
/* Check result. First invalidate the cache again... */
|
||||
__asm __volatile("dcbf 0,%0; sync" :: "r"(sc->sc_cmd) : "memory");
|
||||
|
||||
bus_dmamap_sync(sc->sc_dmatag, sc->sc_cmd_dmamap, BUS_DMASYNC_POSTREAD);
|
||||
|
||||
/* SMU acks the command by inverting the command bits */
|
||||
if (sc->sc_cmd->cmd == ~cmd->cmd)
|
||||
result = 0;
|
||||
else
|
||||
result = EIO;
|
||||
|
||||
mtx_unlock(&sc->sc_mtx);
|
||||
|
||||
return (result);
|
||||
}
|
||||
|
||||
static void
|
||||
smu_slew_cpu_voltage(device_t dev, int to)
|
||||
{
|
||||
struct smu_cmd cmd;
|
||||
|
||||
cmd.cmd = SMU_POWER;
|
||||
cmd.len = 8;
|
||||
cmd.data[0] = 'V';
|
||||
cmd.data[1] = 'S';
|
||||
cmd.data[2] = 'L';
|
||||
cmd.data[3] = 'E';
|
||||
cmd.data[4] = 'W';
|
||||
cmd.data[5] = 0xff;
|
||||
cmd.data[6] = 1;
|
||||
cmd.data[7] = to;
|
||||
|
||||
smu_run_cmd(dev, &cmd);
|
||||
}
|
||||
|
||||
static void
|
||||
smu_cpufreq_pre_change(device_t dev, const struct cf_level *level)
|
||||
{
|
||||
/*
|
||||
* Make sure the CPU voltage is raised before we raise
|
||||
* the clock.
|
||||
*/
|
||||
|
||||
if (level->rel_set[0].freq == 10000 /* max */)
|
||||
smu_slew_cpu_voltage(dev, 0);
|
||||
}
|
||||
|
||||
static void
|
||||
smu_cpufreq_post_change(device_t dev, const struct cf_level *level)
|
||||
{
|
||||
/* We are safe to reduce CPU voltage after a downward transition */
|
||||
|
||||
if (level->rel_set[0].freq < 10000 /* max */)
|
||||
smu_slew_cpu_voltage(dev, 1); /* XXX: 1/4 voltage for 970MP? */
|
||||
}
|
||||
|
||||
/* Routines for probing the SMU doorbell GPIO */
|
||||
static int doorbell_probe(device_t dev);
|
||||
static int doorbell_attach(device_t dev);
|
||||
|
||||
static device_method_t doorbell_methods[] = {
|
||||
/* Device interface */
|
||||
DEVMETHOD(device_probe, doorbell_probe),
|
||||
DEVMETHOD(device_attach, doorbell_attach),
|
||||
{ 0, 0 },
|
||||
};
|
||||
|
||||
static driver_t doorbell_driver = {
|
||||
"smudoorbell",
|
||||
doorbell_methods,
|
||||
0
|
||||
};
|
||||
|
||||
static devclass_t doorbell_devclass;
|
||||
|
||||
DRIVER_MODULE(smudoorbell, macgpio, doorbell_driver, doorbell_devclass, 0, 0);
|
||||
|
||||
static int
|
||||
doorbell_probe(device_t dev)
|
||||
{
|
||||
const char *name = ofw_bus_get_name(dev);
|
||||
|
||||
if (strcmp(name, "smu-doorbell") != 0)
|
||||
return (ENXIO);
|
||||
|
||||
device_set_desc(dev, "SMU Doorbell GPIO");
|
||||
device_quiet(dev);
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
doorbell_attach(device_t dev)
|
||||
{
|
||||
smu_doorbell = dev;
|
||||
return (0);
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user