2  * sun4i_can.c - CAN bus controller driver for Allwinner SUN4I&SUN7I based SoCs
51 #include <linux/can.h>
52 #include <linux/can/dev.h>
53 #include <linux/can/error.h>
69 #define SUN4I_REG_MSEL_ADDR	0x0000	/* CAN Mode Select */
70 #define SUN4I_REG_CMD_ADDR	0x0004	/* CAN Command */
71 #define SUN4I_REG_STA_ADDR	0x0008	/* CAN Status */
72 #define SUN4I_REG_INT_ADDR	0x000c	/* CAN Interrupt Flag */
73 #define SUN4I_REG_INTEN_ADDR	0x0010	/* CAN Interrupt Enable */
74 #define SUN4I_REG_BTIME_ADDR	0x0014	/* CAN Bus Timing 0 */
75 #define SUN4I_REG_TEWL_ADDR	0x0018	/* CAN Tx Error Warning Limit */
76 #define SUN4I_REG_ERRC_ADDR	0x001c	/* CAN Error Counter */
77 #define SUN4I_REG_RMCNT_ADDR	0x0020	/* CAN Receive Message Counter */
78 #define SUN4I_REG_RBUFSA_ADDR	0x0024	/* CAN Receive Buffer Start Address */
79 #define SUN4I_REG_BUF0_ADDR	0x0040	/* CAN Tx/Rx Buffer 0 */
80 #define SUN4I_REG_BUF1_ADDR	0x0044	/* CAN Tx/Rx Buffer 1 */
81 #define SUN4I_REG_BUF2_ADDR	0x0048	/* CAN Tx/Rx Buffer 2 */
82 #define SUN4I_REG_BUF3_ADDR	0x004c	/* CAN Tx/Rx Buffer 3 */
83 #define SUN4I_REG_BUF4_ADDR	0x0050	/* CAN Tx/Rx Buffer 4 */
84 #define SUN4I_REG_BUF5_ADDR	0x0054	/* CAN Tx/Rx Buffer 5 */
85 #define SUN4I_REG_BUF6_ADDR	0x0058	/* CAN Tx/Rx Buffer 6 */
86 #define SUN4I_REG_BUF7_ADDR	0x005c	/* CAN Tx/Rx Buffer 7 */
87 #define SUN4I_REG_BUF8_ADDR	0x0060	/* CAN Tx/Rx Buffer 8 */
88 #define SUN4I_REG_BUF9_ADDR	0x0064	/* CAN Tx/Rx Buffer 9 */
89 #define SUN4I_REG_BUF10_ADDR	0x0068	/* CAN Tx/Rx Buffer 10 */
90 #define SUN4I_REG_BUF11_ADDR	0x006c	/* CAN Tx/Rx Buffer 11 */
91 #define SUN4I_REG_BUF12_ADDR	0x0070	/* CAN Tx/Rx Buffer 12 */
92 #define SUN4I_REG_ACPC_ADDR	0x0040	/* CAN Acceptance Code 0 */
93 #define SUN4I_REG_ACPM_ADDR	0x0044	/* CAN Acceptance Mask 0 */
94 #define SUN4I_REG_RBUF_RBACK_START_ADDR	0x0180	/* CAN transmit buffer start */
95 #define SUN4I_REG_RBUF_RBACK_END_ADDR	0x01b0	/* CAN transmit buffer end */
214 	struct can_priv can;  member
288 	struct can_bittiming *bt = &priv->can.bittiming;  in sun4ican_set_bittiming()
295 	if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)  in sun4ican_set_bittiming()
348 	if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)  in sun4i_can_start()
356 	if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)  in sun4i_can_start()
358 	else if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)  in sun4i_can_start()
373 	priv->can.state = CAN_STATE_ERROR_ACTIVE;  in sun4i_can_start()
383 	priv->can.state = CAN_STATE_STOPPED;  in sun4i_can_stop()
405 			netdev_err(dev, "starting CAN controller failed!\n");  in sun4ican_set_mode()
418 /* transmit a CAN message
421  * [ can_id ] [flags] [len] [can data (up to 8 bytes]
464 	if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)  in sun4ican_start_xmit()
483 	/* create zero'ed CAN frame buffer */  in sun4i_can_rx()
527 	enum can_state state = priv->can.state;  in sun4i_can_err()
549 		/* reset the CAN IP by entering reset mode  in sun4i_can_err()
577 		priv->can.can_stats.bus_error++;  in sun4i_can_err()
617 		priv->can.can_stats.arbitration_lost++;  in sun4i_can_err()
624 	if (state != priv->can.state) {  in sun4i_can_err()
631 			priv->can.state = state;  in sun4i_can_err()
680 				netdev_err(dev, "can't allocate buffer - clearing pending interrupts\n");  in sun4i_can_interrupt()
712 		netdev_err(dev, "could not deassert CAN reset\n");  in sun4ican_open()
716 	/* turn on clocking for CAN peripheral block */  in sun4ican_open()
719 		netdev_err(dev, "could not enable CAN peripheral clock\n");  in sun4ican_open()
725 		netdev_err(dev, "could not start CAN peripheral\n");  in sun4ican_open()
779 		.compatible = "allwinner,sun4i-a10-can",
782 		.compatible = "allwinner,sun7i-a20-can",
785 		.compatible = "allwinner,sun8i-r40-can",
853 			"could not allocate memory for CAN device\n");  in sun4ican_probe()
864 	priv->can.clock.freq = clk_get_rate(clk);  in sun4ican_probe()
865 	priv->can.bittiming_const = &sun4ican_bittiming_const;  in sun4ican_probe()
866 	priv->can.do_set_mode = sun4ican_set_mode;  in sun4ican_probe()
867 	priv->can.do_get_berr_counter = sun4ican_get_berr_counter;  in sun4ican_probe()
868 	priv->can.ctrlmode_supported = CAN_CTRLMODE_BERR_REPORTING |  in sun4ican_probe()
912 MODULE_DESCRIPTION("CAN driver for Allwinner SoCs (A10/A20)");