can: janz-ican3: fix support for older hardware revisions

The Revision 1.0 Janz CMOD-IO Carrier Board does not have support for
the reset registers. To support older hardware, the code is changed to
use the hardware reset register on the Janz VMOD-ICAN3 hardware itself.

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index 98ee4381991189d8814600967acac3b170525b1d..7edadee487bab16c0cbcf514ab59540f35cc2a41 100644 (file)
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -1391,7 +1391,6 @@ static irqreturn_t ican3_irq(int irq, void *dev_id)
  */
 static int ican3_reset_module(struct ican3_dev *mod)
 {
-       u8 val = 1 << mod->num;
        unsigned long start;
        u8 runold, runnew;
 
@@ -1405,8 +1404,7 @@ static int ican3_reset_module(struct ican3_dev *mod)
        runold = ioread8(mod->dpm + TARGET_RUNNING);
 
        /* reset the module */
-       iowrite8(val, &mod->ctrl->reset_assert);
-       iowrite8(val, &mod->ctrl->reset_deassert);
+       iowrite8(0x00, &mod->dpmctrl->hwreset);
 
        /* wait until the module has finished resetting and is running */
        start = jiffies;