diff options
| author |   Roger Quadros <rogerq@ti.com> | 2014-11-07 16:49:19 +0200 |
|---|---|---|
| committer |   Marc Kleine-Budde <mkl@pengutronix.de> | 2014-11-17 12:19:27 +0100 |
| commit | 0741bfb9395ad176be91f66d2ef3f6f669e27890 (patch) | |
| tree | 13b8dd7257a2be3cad489095b672785ef14229fe /drivers | |
| parent | can: c_can: Add syscon/regmap RAMINIT mechanism (diff) | |
| download | linux-dev-0741bfb9395ad176be91f66d2ef3f6f669e27890.tar.xz linux-dev-0741bfb9395ad176be91f66d2ef3f6f669e27890.zip | |
can: c_can: Add support for START pulse in RAMINIT sequence
Some SoCs e.g. (TI DRA7xx) need a START pulse to start the
RAMINIT sequence i.e. START bit must be set and cleared before
checking for the DONE bit status.
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/can/c_can/c_can.h | 1 | ||||
| -rw-r--r-- | drivers/net/can/c_can/c_can_platform.c | 7 |
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h index 28a73d14ea8d..8acdc7fa4792 100644 --- a/drivers/net/can/c_can/c_can.h +++ b/drivers/net/can/c_can/c_can.h @@ -188,6 +188,7 @@ struct c_can_raminit { struct regmap *syscon; /* for raminit ctrl. reg. access */ unsigned int reg; /* register index within syscon */ struct raminit_bits bits; + bool needs_pulse; }; /* c_can private data structure */ diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c index 1fbfa1d59c29..41fa460c3592 100644 --- a/drivers/net/can/c_can/c_can_platform.c +++ b/drivers/net/can/c_can/c_can_platform.c @@ -120,6 +120,12 @@ static void c_can_hw_raminit_syscon(const struct c_can_priv *priv, bool enable) ctrl |= 1 << raminit->bits.start; regmap_write(raminit->syscon, raminit->reg, ctrl); + /* clear START bit if start pulse is needed */ + if (raminit->needs_pulse) { + ctrl &= ~(1 << raminit->bits.start); + regmap_write(raminit->syscon, raminit->reg, ctrl); + } + ctrl |= 1 << raminit->bits.done; c_can_hw_raminit_wait_syscon(priv, mask, ctrl); } @@ -325,6 +331,7 @@ static int c_can_plat_probe(struct platform_device *pdev) } raminit->bits = drvdata->raminit_bits[id]; + raminit->needs_pulse = drvdata->raminit_pulse; priv->raminit = c_can_hw_raminit_syscon; } else { |