From: Torin Cooper-Bennun <to...@maxiluxsystems.com> Add infrastucture to allow internal timestamps from the M_CAN to be configured and retrieved.
Link: https://lore.kernel.org/r/20210308102427.63916-2-to...@maxiluxsystems.com Signed-off-by: Torin Cooper-Bennun <to...@maxiluxsystems.com> Signed-off-by: Marc Kleine-Budde <m...@pengutronix.de> --- drivers/net/can/m_can/m_can.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index 12a75ebe9ce1..9f7cfe91f7ff 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -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); -- 2.30.2
