From: Andrejs Cainikovs <Andrejs.Cainikovs@xxxxxxxxxxxxx>
D_CAN supports up to 128 message objects, comparing to 32 on C_CAN.
However, some CPUs with D_CAN controller have their own limits:
TI AM335x Sitara CPU, for example, supports max of 64 message objects.
This patch extends max D_CAN message objects up to 64.
Signed-off-by: Andrejs Cainikovs <andrejs.cainikovs@xxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Kurt Van Dijck <dev.kurt@xxxxxxxxxxxxxxxxxxxxxx>
---
drivers/net/can/c_can/Kconfig | 1 +
drivers/net/can/c_can/c_can.c | 34 ++++++++++++++--------------------
drivers/net/can/c_can/c_can.h | 20 ++++++++++++++++----
3 files changed, 31 insertions(+), 24 deletions(-)
diff --git a/drivers/net/can/c_can/Kconfig b/drivers/net/can/c_can/Kconfig
index b0f206d3..9cd8523 100644
--- a/drivers/net/can/c_can/Kconfig
+++ b/drivers/net/can/c_can/Kconfig
@@ -21,4 +21,5 @@ config CAN_C_CAN_PCI
---help---
This driver adds support for the C_CAN/D_CAN chips connected
to the PCI bus.
+
endif
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index cf2d47e..848cc77 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -357,15 +357,6 @@ static void c_can_setup_tx_object(struct net_device *dev, int iface,
}
}
-static inline void c_can_activate_all_lower_rx_msg_obj(struct net_device *dev,
- int iface)
-{
- int i;
-
- for (i = C_CAN_MSG_OBJ_RX_FIRST; i <= C_CAN_MSG_RX_LOW_LAST; i++)
- c_can_object_get(dev, iface, i, IF_COMM_CLR_NEWDAT);
-}
-
static int c_can_handle_lost_msg_obj(struct net_device *dev,
int iface, int objno, u32 ctrl)
{
@@ -737,7 +728,12 @@ static void c_can_do_tx(struct net_device *dev)
struct sk_buff *skb;
u8 len;
- clr = pend = priv->read_reg(priv, C_CAN_INTPND2_REG);
+ if (priv->type == BOSCH_D_CAN) {
+ pend = priv->read_reg32(priv, C_CAN_INTPND3_REG);
+ } else {
+ pend = priv->read_reg(priv, C_CAN_INTPND2_REG);
+ }
+ clr = pend;
while ((idx = ffs(pend))) {
idx--;
@@ -847,7 +843,13 @@ static int c_can_read_objects(struct net_device *dev, struct c_can_priv *priv,
static inline u32 c_can_get_pending(struct c_can_priv *priv)
{
- u32 pend = priv->read_reg(priv, C_CAN_NEWDAT1_REG);
+ u32 pend;
+
+ if (priv->type == BOSCH_D_CAN) {
+ pend = priv->read_reg32(priv, C_CAN_NEWDAT1_REG);
+ } else {
+ pend = priv->read_reg(priv, C_CAN_NEWDAT1_REG);
+ }
return pend;
}
@@ -858,8 +860,7 @@ static inline u32 c_can_get_pending(struct c_can_priv *priv)
* c_can core saves a received CAN message into the first free message
* object it finds free (starting with the lowest). Bits NEWDAT and
* INTPND are set for this message object indicating that a new message
- * has arrived. To work-around this issue, we keep two groups of message
- * objects whose partitioning is defined by C_CAN_MSG_OBJ_RX_SPLIT.
+ * has arrived.
*
* We clear the newdat bit right away.
*
@@ -870,13 +871,6 @@ static int c_can_do_rx_poll(struct net_device *dev)
struct c_can_priv *priv = netdev_priv(dev);
u32 pkts = 0, pend = 0, toread, n;
- /*
- * It is faster to read only one 16bit register. This is only possible
- * for a maximum number of 16 objects.
- */
- BUILD_BUG_ON_MSG(C_CAN_MSG_OBJ_RX_LAST > 16,
- "Implementation does not support more message objects than 16");
-
for (;;) {
if (!pend) {
pend = c_can_get_pending(priv);
diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
index 8387b3f..24128e7 100644
--- a/drivers/net/can/c_can/c_can.h
+++ b/drivers/net/can/c_can/c_can.h
@@ -25,9 +25,15 @@
#include <linux/can/rx-offload.h>
/* message object split */
+
+#ifdef CONFIG_CAN_C_CAN_DCAN_64_MSG_OBJECTS
+#define C_CAN_NO_OF_OBJECTS 64
+#else
#define C_CAN_NO_OF_OBJECTS 32
-#define C_CAN_MSG_OBJ_RX_NUM 16
-#define C_CAN_MSG_OBJ_TX_NUM 16
+#endif
+
+#define C_CAN_MSG_OBJ_TX_NUM (C_CAN_NO_OF_OBJECTS >> 1)
+#define C_CAN_MSG_OBJ_RX_NUM (C_CAN_NO_OF_OBJECTS - C_CAN_MSG_OBJ_TX_NUM)
#define C_CAN_MSG_OBJ_RX_FIRST 1
#define C_CAN_MSG_OBJ_RX_LAST (C_CAN_MSG_OBJ_RX_FIRST + \
@@ -37,9 +43,11 @@
#define C_CAN_MSG_OBJ_TX_LAST (C_CAN_MSG_OBJ_TX_FIRST + \
C_CAN_MSG_OBJ_TX_NUM - 1)
-#define C_CAN_MSG_OBJ_RX_SPLIT 9
-#define C_CAN_MSG_RX_LOW_LAST (C_CAN_MSG_OBJ_RX_SPLIT - 1)
+#ifdef CONFIG_CAN_C_CAN_DCAN_64_MSG_OBJECTS
+#define RECEIVE_OBJECT_BITS 0xffffffff
+#else
#define RECEIVE_OBJECT_BITS 0x0000ffff
+#endif
enum reg {
C_CAN_CTRL_REG = 0,
@@ -78,6 +86,8 @@ enum reg {
C_CAN_NEWDAT2_REG,
C_CAN_INTPND1_REG,
C_CAN_INTPND2_REG,
+ C_CAN_INTPND3_REG,
+ C_CAN_INTPND4_REG,
C_CAN_MSGVAL1_REG,
C_CAN_MSGVAL2_REG,
C_CAN_FUNCTION_REG,
@@ -139,6 +149,8 @@ enum reg {
[C_CAN_NEWDAT2_REG] = 0x9E,
[C_CAN_INTPND1_REG] = 0xB0,
[C_CAN_INTPND2_REG] = 0xB2,
+ [C_CAN_INTPND3_REG] = 0xB4,
+ [C_CAN_INTPND4_REG] = 0xB6,
[C_CAN_MSGVAL1_REG] = 0xC4,
[C_CAN_MSGVAL2_REG] = 0xC6,
[C_CAN_IF1_COMREQ_REG] = 0x100,
--
1.8.5.rc3
