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[PATCH 11/15] ssb: set the pmu watchdog if available

To: linville@tuxdriver.com
Subject: [PATCH 11/15] ssb: set the pmu watchdog if available
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sat, 24 Nov 2012 23:24:11 +0100
Cc: linux-wireless@vger.kernel.org, wim@iguana.be, linux-watchdog@vger.kernel.org, castet.matthieu@free.fr, biblbroks@sezampro.rs, m@bues.ch, zajec5@gmail.com, linux-mips@linux-mips.org, Hauke Mehrtens <hauke@hauke-m.de>
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Some all ssb based devices have a PMU and the PMU watchdog should be
used and not the old one in chip common in this case. This patch also
calculates the maximal number the watchdog could be set to.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 drivers/ssb/driver_chipcommon.c |   38 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

diff --git a/drivers/ssb/driver_chipcommon.c b/drivers/ssb/driver_chipcommon.c
index 7789f42..5631640 100644
--- a/drivers/ssb/driver_chipcommon.c
+++ b/drivers/ssb/driver_chipcommon.c
@@ -288,6 +288,24 @@ static u32 ssb_chipco_alp_clock(struct ssb_chipcommon *cc)
        return 20000000;
 }
 
+static u32 ssb_chipco_watchdog_get_max_timer(struct ssb_chipcommon *cc)
+{
+       u32 nb;
+
+       if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
+               if (cc->dev->id.revision < 26)
+                       nb = 16;
+               else
+                       nb = (cc->dev->id.revision >= 37) ? 32 : 24;
+       } else {
+               nb = 28;
+       }
+       if (nb == 32)
+               return 0xffffffff;
+       else
+               return (1 << nb) - 1;
+}
+
 void ssb_chipcommon_init(struct ssb_chipcommon *cc)
 {
        if (!cc->dev)
@@ -405,8 +423,24 @@ void ssb_chipco_timing_init(struct ssb_chipcommon *cc,
 /* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */
 void ssb_chipco_watchdog_timer_set(struct ssb_chipcommon *cc, u32 ticks)
 {
-       /* instant NMI */
-       chipco_write32(cc, SSB_CHIPCO_WATCHDOG, ticks);
+       u32 maxt;
+       enum ssb_clkmode clkmode;
+
+       maxt = ssb_chipco_watchdog_get_max_timer(cc);
+       if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
+               if (ticks == 1)
+                       ticks = 2;
+               else if (ticks > maxt)
+                       ticks = maxt;
+               chipco_write32(cc, SSB_CHIPCO_PMU_WATCHDOG, ticks);
+       } else {
+               clkmode = ticks ? SSB_CLKMODE_FAST : SSB_CLKMODE_DYNAMIC;
+               ssb_chipco_set_clockmode(cc, clkmode);
+               if (ticks > maxt)
+                       ticks = maxt;
+               /* instant NMI */
+               chipco_write32(cc, SSB_CHIPCO_WATCHDOG, ticks);
+       }
 }
 
 void ssb_chipco_irq_mask(struct ssb_chipcommon *cc, u32 mask, u32 value)
-- 
1.7.10.4


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