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/* $OpenBSD: dfs.c,v 1.1 2011/05/25 07:42:15 mpi Exp $ */
/*
* Copyright (c) 2011 Martin Pieuchot <mpi@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <dev/ofw/openfirm.h>
#include <machine/cpu.h>
#include <machine/autoconf.h>
#include <macppc/pci/macobio.h>
#define DFS2 (1 << 22) /* Divide-by-Two */
#define DFS4 (1 << 23) /* Divide-by-Four (MPC7448 Specific) */
extern int perflevel;
struct dfs_softc {
struct device sc_dev;
int sc_voltage;
};
int dfs_match(struct device *, void *, void *);
void dfs_attach(struct device *, struct device *, void *);
void dfs_setperf(int);
void dfs_scale_frequency(u_int);
struct cfattach dfs_ca = {
sizeof(struct dfs_softc), dfs_match, dfs_attach
};
struct cfdriver dfs_cd = {
NULL, "dfs", DV_DULL
};
int
dfs_match(struct device *parent, void *arg, void *aux)
{
struct confargs *ca = aux;
uint16_t cpu;
if (strcmp(ca->ca_name, "cpu-vcore-select") != 0)
return (0);
cpu = ppc_mfpvr() >> 16;
if (cpu == PPC_CPU_MPC7447A || cpu == PPC_CPU_MPC7448)
return (1);
return (0);
}
void
dfs_attach(struct device *parent, struct device *self, void *aux)
{
struct dfs_softc *sc = (struct dfs_softc *)self;
struct confargs *ca = aux;
uint32_t hid1, reg;
uint16_t cpu;
/*
* On some models the vcore-select offset is relative to
* its parent offset and not to the bus base address.
*/
OF_getprop(OF_parent(ca->ca_node), "reg", ®, sizeof(reg));
if (reg > ca->ca_reg[0])
sc->sc_voltage = reg + ca->ca_reg[0];
else
sc->sc_voltage = ca->ca_reg[0];
hid1 = ppc_mfhid1();
if (hid1 & DFS4) {
ppc_curfreq = ppc_maxfreq / 4;
perflevel = 25;
} else if (hid1 & DFS2) {
ppc_curfreq = ppc_maxfreq / 2;
perflevel = 50;
}
cpu_setperf = dfs_setperf;
printf(": speeds: %d, %d", ppc_maxfreq, ppc_maxfreq / 2);
cpu = ppc_mfpvr() >> 16;
if (cpu == PPC_CPU_MPC7448)
printf(", %d", ppc_maxfreq / 4);
printf(" MHz\n");
}
void
dfs_setperf(int perflevel)
{
struct dfs_softc *sc = dfs_cd.cd_devs[0];
if (perflevel > 50) {
if (ppc_curfreq != ppc_maxfreq) {
macobio_write(sc->sc_voltage, GPIO_DDR_OUTPUT | 1);
delay(1000);
dfs_scale_frequency(FREQ_FULL);
}
} else {
uint16_t cpu;
cpu = ppc_mfpvr() >> 16;
if (cpu == PPC_CPU_MPC7448 && perflevel <= 25) {
if (ppc_curfreq != ppc_maxfreq / 4) {
dfs_scale_frequency(FREQ_QUARTER);
macobio_write(sc->sc_voltage,
GPIO_DDR_OUTPUT | 0);
delay(1000);
}
} else {
if (ppc_curfreq != ppc_maxfreq / 2) {
dfs_scale_frequency(FREQ_HALF);
macobio_write(sc->sc_voltage,
GPIO_DDR_OUTPUT | 0);
delay(1000);
}
}
}
}
void
dfs_scale_frequency(u_int freq_scale)
{
uint32_t hid1;
int s;
s = splhigh();
hid1 = ppc_mfhid1();
hid1 &= ~(DFS2 | DFS4);
switch (freq_scale) {
case FREQ_QUARTER:
hid1 |= DFS4;
ppc_curfreq = ppc_maxfreq / 4;
break;
case FREQ_HALF:
hid1 |= DFS2;
ppc_curfreq = ppc_maxfreq / 2;
break;
case FREQ_FULL: /* FALLTHROUGH */
default:
ppc_curfreq = ppc_maxfreq;
}
asm volatile ("sync");
ppc_mthid1(hid1);
asm volatile ("sync; isync");
splx(s);
}
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