rtc: imxdi: when locked, do not fail silently
If the DryICE unit is locked it is impossible to set the time. Provide an
error message for this case.
Signed-off-by: Juergen Borleis <jbe@pengutronix.de>
Signed-off-by: Robert Schwebel <rsc@pengutronix.de>
[rsc: got NDA clearance from Freescale]
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/drivers/rtc/rtc-imxdi.c b/drivers/rtc/rtc-imxdi.c
index a08da4a..7bffd7f 100644
--- a/drivers/rtc/rtc-imxdi.c
+++ b/drivers/rtc/rtc-imxdi.c
@@ -566,14 +566,35 @@
static int dryice_rtc_set_mmss(struct device *dev, unsigned long secs)
{
struct imxdi_dev *imxdi = dev_get_drvdata(dev);
+ u32 dcr, dsr;
int rc;
+ dcr = readl(imxdi->ioaddr + DCR);
+ dsr = readl(imxdi->ioaddr + DSR);
+
+ if (!(dcr & DCR_TCE) || (dsr & DSR_SVF)) {
+ if (dcr & DCR_TCHL) {
+ /* we are even more out of luck */
+ di_what_is_to_be_done(imxdi, "battery");
+ return -EPERM;
+ }
+ if ((dcr & DCR_TCSL) || (dsr & DSR_SVF)) {
+ /* we are out of luck for now */
+ di_what_is_to_be_done(imxdi, "main");
+ return -EPERM;
+ }
+ }
+
/* zero the fractional part first */
rc = di_write_wait(imxdi, 0, DTCLR);
- if (rc == 0)
- rc = di_write_wait(imxdi, secs, DTCMR);
+ if (rc != 0)
+ return rc;
- return rc;
+ rc = di_write_wait(imxdi, secs, DTCMR);
+ if (rc != 0)
+ return rc;
+
+ return di_write_wait(imxdi, readl(imxdi->ioaddr + DCR) | DCR_TCE, DCR);
}
static int dryice_rtc_alarm_irq_enable(struct device *dev,