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/* $OpenBSD: smu.c,v 1.1 2005/10/19 14:46:00 kettenis Exp $ */
/*
* Copyright (c) 2005 Mark Kettenis
*
* 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/systm.h>
#include <sys/device.h>
#include <sys/types.h>
#include <machine/autoconf.h>
#include <dev/clock_subr.h>
#include <dev/ofw/openfirm.h>
int smu_match(struct device *, void *, void *);
void smu_attach(struct device *, struct device *, void *);
struct smu_softc {
struct device sc_dev;
/* SMU command buffer. */
bus_dma_tag_t sc_dmat;
bus_dmamap_t sc_cmdmap;
bus_dma_segment_t sc_cmdseg[1];
caddr_t sc_cmd;
/* Doorbell and mailbox. */
struct ppc_bus_space sc_mem_bus_space;
bus_space_tag_t sc_memt;
bus_space_handle_t sc_gpioh;
bus_space_handle_t sc_buffh;
};
struct cfattach smu_ca = {
sizeof(struct smu_softc), smu_match, smu_attach
};
struct cfdriver smu_cd = {
NULL, "smu", DV_DULL,
};
/* SMU command. */
struct smu_cmd {
u_int8_t cmd;
u_int8_t len;
u_int8_t data[254];
};
#define SMU_CMDSZ sizeof(struct smu_cmd)
/* Real Time Clock. */
#define SMU_RTC 0x8e
#define SMU_RTC_SET_DATETIME 0x80
#define SMU_RTC_GET_DATETIME 0x81
int smu_do_cmd(struct smu_softc *, int);
int smu_time_read(time_t *);
int smu_time_write(time_t);
#define GPIO_DDR 0x04 /* Data direction */
#define GPIO_DDR_OUTPUT 0x04 /* Output */
#define GPIO_DDR_INPUT 0x00 /* Input */
#define GPIO_LEVEL 0x02 /* Pin level (RO) */
#define GPIO_DATA 0x01 /* Data */
int
smu_match(struct device *parent, void *cf, void *aux)
{
struct confargs *ca = aux;
if (strcmp(ca->ca_name, "smu") == 0)
return (1);
return (0);
}
/* XXX */
extern struct powerpc_bus_dma_tag pci_bus_dma_tag;
/* XXX */
typedef int (clock_read_t)(int *sec, int *min, int *hour, int *day,
int *mon, int *yr);
typedef int (time_read_t)(time_t *sec);
typedef int (time_write_t)(time_t sec);
extern time_read_t *time_read;
extern time_write_t *time_write;
extern clock_read_t *clock_read;
void
smu_attach(struct device *parent, struct device *self, void *aux)
{
struct smu_softc *sc = (struct smu_softc *)self;
int nseg;
/* XXX */
sc->sc_mem_bus_space.bus_base = 0x80000000;
sc->sc_mem_bus_space.bus_size = 0;
sc->sc_mem_bus_space.bus_io = 0;
sc->sc_memt = &sc->sc_mem_bus_space;
/* XXX Should get this from OF or macgpio. */
if (bus_space_map(sc->sc_memt, 0x50 + 0x12, 1, 0, &sc->sc_gpioh)) {
printf(": cannot map smu-doorbell gpio\n");
return;
}
/* XXX Should get this from OF. */
if (bus_space_map(sc->sc_memt, 0x860c, 4, 0, &sc->sc_buffh)) {
printf(": cannot map smu-doorbell buffer\n");
return;
}
/* XXX */
sc->sc_dmat = &pci_bus_dma_tag;
/* Allocate and map SMU command buffer. */
if (bus_dmamem_alloc(sc->sc_dmat, SMU_CMDSZ, 0, 0,
sc->sc_cmdseg, 1, &nseg, BUS_DMA_NOWAIT)) {
printf(": cannot allocate cmd buffer\n");
return;
}
if (bus_dmamem_map(sc->sc_dmat, sc->sc_cmdseg, nseg,
SMU_CMDSZ, &sc->sc_cmd, BUS_DMA_NOWAIT)) {
printf(": cannot map cmd buffer\n");
bus_dmamem_free(sc->sc_dmat, sc->sc_cmdseg, 1);
return;
}
if (bus_dmamap_create(sc->sc_dmat, SMU_CMDSZ, 1, SMU_CMDSZ, 0,
BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &sc->sc_cmdmap)) {
printf(": cannot create cmd dmamap\n");
bus_dmamem_unmap(sc->sc_dmat, sc->sc_cmd, SMU_CMDSZ);
bus_dmamem_free(sc->sc_dmat, sc->sc_cmdseg, 1);
return;
}
if (bus_dmamap_load(sc->sc_dmat, sc->sc_cmdmap, sc->sc_cmd,
SMU_CMDSZ, NULL, BUS_DMA_NOWAIT)) {
printf(": cannot load cmd dmamap\n");
bus_dmamap_destroy(sc->sc_dmat, sc->sc_cmdmap);
bus_dmamem_unmap(sc->sc_dmat, sc->sc_cmd, SMU_CMDSZ);
bus_dmamem_free(sc->sc_dmat, sc->sc_cmdseg, nseg);
return;
}
/* Initialize global variables that control RTC functionality. */
clock_read = NULL;
time_read = smu_time_read;
time_write = smu_time_write;
printf("\n");
}
int
smu_do_cmd(struct smu_softc *sc, int timo)
{
struct smu_cmd *cmd = (struct smu_cmd *)sc->sc_cmd;
u_int8_t gpio, ack = ~cmd->cmd;
/* Write to mailbox. */
bus_space_write_4(sc->sc_memt, sc->sc_buffh, 0,
sc->sc_cmdmap->dm_segs->ds_addr);
/* Flush to RAM. */
asm __volatile__ ("dcbst 0,%0; sync" :: "r"(sc->sc_cmd): "memory");
/* Ring doorbell. */
bus_space_write_1(sc->sc_memt, sc->sc_gpioh, 0, GPIO_DDR_OUTPUT);
do {
gpio = bus_space_read_1(sc->sc_memt, sc->sc_gpioh, 0);
timo -= 50;
if (timo < 0)
return (ETIMEDOUT);
delay(50 * 1000);
} while (!(gpio & (GPIO_DATA)));
/* CPU might have brought back the cache line. */
asm __volatile__ ("dcbf 0,%0; sync" :: "r"(sc->sc_cmd) : "memory");
if (cmd->cmd != ack)
return (EIO);
return (0);
}
int
smu_time_read(time_t *secs)
{
struct smu_softc *sc = smu_cd.cd_devs[0];
struct smu_cmd *cmd = (struct smu_cmd *)sc->sc_cmd;
struct clock_ymdhms dt;
int error;
cmd->cmd = SMU_RTC;
cmd->len = 1;
cmd->data[0] = SMU_RTC_GET_DATETIME;
error = smu_do_cmd(sc, 800);
if (error) {
*secs = 0;
return (error);
}
dt.dt_year = 2000 + FROMBCD(cmd->data[6]);
dt.dt_mon = FROMBCD(cmd->data[5]);
dt.dt_day = FROMBCD(cmd->data[4]);
dt.dt_hour = FROMBCD(cmd->data[2]);
dt.dt_min = FROMBCD(cmd->data[1]);
dt.dt_sec = FROMBCD(cmd->data[0]);
*secs = clock_ymdhms_to_secs(&dt);
return (0);
}
int
smu_time_write(time_t secs)
{
struct smu_softc *sc = smu_cd.cd_devs[0];
struct smu_cmd *cmd = (struct smu_cmd *)sc->sc_cmd;
struct clock_ymdhms dt;
clock_secs_to_ymdhms(secs, &dt);
cmd->cmd = SMU_RTC;
cmd->len = 8;
cmd->data[0] = SMU_RTC_SET_DATETIME;
cmd->data[1] = TOBCD(dt.dt_sec);
cmd->data[2] = TOBCD(dt.dt_min);
cmd->data[3] = TOBCD(dt.dt_hour);
cmd->data[4] = TOBCD(dt.dt_wday);
cmd->data[5] = TOBCD(dt.dt_day);
cmd->data[6] = TOBCD(dt.dt_mon);
cmd->data[7] = TOBCD(dt.dt_year - 2000);
return (smu_do_cmd(sc, 800));
}
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