[PATCH AUTOSEL 5.18 71/93] can: sja1000: Add Quirk for RZ/N1 SJA1000 CAN controller

Sasha Levin
2022-08-11T16:09:02Z

From: Biju Das <biju.das.jz@bp.renesas.com>

[ Upstream commit 2d99bfbf3386962692dcccd73931cb0db07a1a43 ]

As per Chapter 6.5.16 of the RZ/N1 Peripheral Manual, The SJA1000
CAN controller does not support Clock Divider Register compared to
the reference Philips SJA1000 device.

This patch adds a device quirk to handle this difference.

Link: https://lore.kernel.org/all/20220710115248.190280-4-biju.das.jz@bp.renesas.com
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/can/sja1000/sja1000.c | 8 +++++---
drivers/net/can/sja1000/sja1000.h | 3 ++-
2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index 966316479485..12c4cd8dc05d 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -184,8 +184,9 @@ static void chipset_init(struct net_device *dev)
{
struct sja1000_priv *priv = netdev_priv(dev);

- /* set clock divider and output control register */
- priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
+ if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG))
+ /* set clock divider and output control register */
+ priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);

/* set acceptance filter (accept all) */
priv->write_reg(priv, SJA1000_ACCC0, 0x00);
@@ -210,7 +211,8 @@ static void sja1000_start(struct net_device *dev)
set_reset_mode(dev);

/* Initialize chip if uninitialized at this stage */
- if (!(priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN))
+ if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG ||
+ priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN))
chipset_init(dev);

/* Clear error counters and error code capture */
diff --git a/drivers/net/can/sja1000/sja1000.h b/drivers/net/can/sja1000/sja1000.h
index 9d46398f8154..7f736f1df547 100644
--- a/drivers/net/can/sja1000/sja1000.h
+++ b/drivers/net/can/sja1000/sja1000.h
@@ -145,7 +145,8 @@
/*
* Flags for sja1000priv.flags
*/
-#define SJA1000_CUSTOM_IRQ_HANDLER 0x1
+#define SJA1000_CUSTOM_IRQ_HANDLER BIT(0)
+#define SJA1000_QUIRK_NO_CDR_REG BIT(1)

/*
* SJA1000 private data structure
--
2.35.1