039c8db774
On the BeagleBoard-xM, the RTC is located on the Power Management IC (PMIC). To keep things consistent, access to the PMIC's RTC is done through the readclock driver. The readclock driver forwards the request on to the TPS65950 driver which does the work of manipulating the registers on the chip. Change-Id: I53cefbb59c5a9ab87fab90df3cc1a75a6e430f58
121 lines
2.2 KiB
C
121 lines
2.2 KiB
C
/*
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* Some real time clocks are embedded within other multi-function chips.
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* Drivers for such chips will implement the RTCDEV protocol and the
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* readclock driver will simply forward on the message to the driver.
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* This keeps things simple for any other services that need to access
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* the RTC as they only have to know / care about the readclock driver.
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*/
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#include <minix/syslib.h>
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#include <minix/drvlib.h>
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#include <minix/sysutil.h>
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#include <minix/log.h>
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#include <minix/rs.h>
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#include <minix/ds.h>
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#include <minix/safecopies.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <time.h>
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#include <lib.h>
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#include "forward.h"
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#include "readclock.h"
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static int fwd_msg(int type, struct tm *t, int t_access, int flags);
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static struct log log = {
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.name = "readclock.fwd",
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.log_level = LEVEL_INFO,
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.log_func = default_log
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};
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/*
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* Label of the driver that messages should be forwarded to.
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*/
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static char *target_label;
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int
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fwd_set_label(char *label)
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{
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target_label = label;
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return OK;
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}
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int
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fwd_init(void)
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{
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if (target_label == NULL) {
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return EINVAL;
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}
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return OK;
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}
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static int
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fwd_msg(int type, struct tm *t, int t_access, int flags)
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{
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int r;
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message m;
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endpoint_t ep;
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cp_grant_id_t gid;
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r = ds_retrieve_label_endpt(target_label, &ep);
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if (r != 0) {
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return -1;
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}
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if (type == RTCDEV_PWR_OFF) {
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/* RTCDEV_PWR_OFF messages don't contain any data/flags. */
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return _syscall(ep, RTCDEV_PWR_OFF, &m);
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}
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gid = cpf_grant_direct(ep, (vir_bytes) t, sizeof(struct tm), t_access);
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if (!GRANT_VALID(gid)) {
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log_warn(&log, "Could not create grant.\n");
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return -1;
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}
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m.RTCDEV_GRANT = gid;
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m.RTCDEV_FLAGS = flags;
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r = _syscall(ep, type, &m);
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cpf_revoke(gid);
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if (r != RTCDEV_REPLY || m.RTCDEV_STATUS != 0) {
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log_warn(&log, "Call to '%s' failed.\n", target_label);
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return -1;
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}
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return OK;
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}
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int
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fwd_get_time(struct tm *t, int flags)
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{
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return fwd_msg(RTCDEV_GET_TIME_G, t, CPF_WRITE, flags);
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}
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int
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fwd_set_time(struct tm *t, int flags)
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{
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return fwd_msg(RTCDEV_SET_TIME_G, t, CPF_READ, flags);
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}
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int
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fwd_pwr_off(void)
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{
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return fwd_msg(RTCDEV_PWR_OFF, NULL, 0, RTCDEV_NOFLAGS);
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}
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void
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fwd_exit(void)
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{
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target_label = NULL;
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}
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