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can: m_can: add infrastructure for internal timestamps 

Add infrastucture to allow internal timestamps from the M_CAN to be
configured and retrieved.

Link: https://lore.kernel.org/r/20210308102427.63916-2-torin@maxiluxsystems.com
Signed-off-by: Torin Cooper-Bennun <torin@maxiluxsystems.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Torin Cooper-Bennun 2021-03-08 10:24:26 +00:00 committed by Marc Kleine-Budde
parent 8fa12201b6
commit 17447f0820
1 changed files with 27 additions and 0 deletions
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27
drivers/net/can/m_can/m_can.c
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@ -8,6 +8,7 @@
* https://github.com/linux-can/can-doc/tree/master/m_can
*/
#include <linux/bitfield.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
@ -148,6 +149,16 @@ enum m_can_reg {
#define NBTP_NTSEG2_SHIFT 0
#define NBTP_NTSEG2_MASK (0x7f << NBTP_NTSEG2_SHIFT)
/* Timestamp Counter Configuration Register (TSCC) */
#define TSCC_TCP_MASK GENMASK(19, 16)
#define TSCC_TSS_MASK GENMASK(1, 0)
#define TSCC_TSS_DISABLE 0x0
#define TSCC_TSS_INTERNAL 0x1
#define TSCC_TSS_EXTERNAL 0x2
/* Timestamp Counter Value Register (TSCV) */
#define TSCV_TSC_MASK GENMASK(15, 0)
/* Error Counter Register(ECR) */
#define ECR_RP BIT(15)
#define ECR_REC_SHIFT 8
@ -302,6 +313,7 @@ enum m_can_reg {
#define RX_BUF_ANMF BIT(31)
#define RX_BUF_FDF BIT(21)
#define RX_BUF_BRS BIT(20)
#define RX_BUF_RXTS_MASK GENMASK(15, 0)
/* Tx Buffer Element */
/* T0 */
@ -319,6 +331,7 @@ enum m_can_reg {
/* E1 */
#define TX_EVENT_MM_SHIFT TX_BUF_MM_SHIFT
#define TX_EVENT_MM_MASK (0xff << TX_EVENT_MM_SHIFT)
#define TX_EVENT_TXTS_MASK GENMASK(15, 0)
static inline u32 m_can_read(struct m_can_classdev *cdev, enum m_can_reg reg)
{
@ -413,6 +426,20 @@ static inline void m_can_disable_all_interrupts(struct m_can_classdev *cdev)
m_can_write(cdev, M_CAN_ILE, 0x0);
}
/* Retrieve internal timestamp counter from TSCV.TSC, and shift it to 32-bit
* width.
*/
static u32 m_can_get_timestamp(struct m_can_classdev *cdev)
{
u32 tscv;
u32 tsc;
tscv = m_can_read(cdev, M_CAN_TSCV);
tsc = FIELD_GET(TSCV_TSC_MASK, tscv);
return (tsc << 16);
}
static void m_can_clean(struct net_device *net)
{
struct m_can_classdev *cdev = netdev_priv(net);