bcma: set the pmu watchdog if available

Mostly all bcma based devices have a PMU and the PMU watchdog should be
used and not the old one in chip common. This patch also calculates the
maximal number the watchdog could be set to.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 40 insertions, 2 deletions

diff --git a/drivers/bcma/driver_chipcommon.c b/drivers/bcma/driver_chipcommon.c
index ef6855398b8..7c132e5eceb 100644
--- a/drivers/bcma/driver_chipcommon.c
+++ b/drivers/bcma/driver_chipcommon.c
@@ -31,6 +31,28 @@ static u32 bcma_chipco_alp_clock(struct bcma_drv_cc *cc)
         return 20000000;
 }
 
+static u32 bcma_chipco_watchdog_get_max_timer(struct bcma_drv_cc *cc)
+{
+        struct bcma_bus *bus = cc->core->bus;
+        u32 nb;
+
+        if (cc->capabilities & BCMA_CC_CAP_PMU) {
+                if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
+                        nb = 32;
+                else if (cc->core->id.rev < 26)
+                        nb = 16;
+                else
+                        nb = (cc->core->id.rev >= 37) ? 32 : 24;
+        } else {
+                nb = 28;
+        }
+        if (nb == 32)
+                return 0xffffffff;
+        else
+                return (1 << nb) - 1;
+}
+
+
 void bcma_core_chipcommon_early_init(struct bcma_drv_cc *cc)
 {
         if (cc->early_setup_done)
@@ -85,8 +107,24 @@ void bcma_core_chipcommon_init(struct bcma_drv_cc *cc)
 /* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */
 void bcma_chipco_watchdog_timer_set(struct bcma_drv_cc *cc, u32 ticks)
 {
-        /* instant NMI */
-        bcma_cc_write32(cc, BCMA_CC_WATCHDOG, ticks);
+        u32 maxt;
+        enum bcma_clkmode clkmode;
+
+        maxt = bcma_chipco_watchdog_get_max_timer(cc);
+        if (cc->capabilities & BCMA_CC_CAP_PMU) {
+                if (ticks == 1)
+                        ticks = 2;
+                else if (ticks > maxt)
+                        ticks = maxt;
+                bcma_cc_write32(cc, BCMA_CC_PMU_WATCHDOG, ticks);
+        } else {
+                clkmode = ticks ? BCMA_CLKMODE_FAST : BCMA_CLKMODE_DYNAMIC;
+                bcma_core_set_clockmode(cc->core, clkmode);
+                if (ticks > maxt)
+                        ticks = maxt;
+                /* instant NMI */
+                bcma_cc_write32(cc, BCMA_CC_WATCHDOG, ticks);
+        }
 }
 
 void bcma_chipco_irq_mask(struct bcma_drv_cc *cc, u32 mask, u32 value)