can: sun4i_can: Add support for the Allwinner D1

[ Upstream commit 8abb952 ]

The controllers present in the D1 are extremely similar to the R40
and require the same reset quirks, but An extra quirk is needed to support
receiving packets.

Signed-off-by: John Watts <contact@jookia.org>
Link: https://lore.kernel.org/all/20230721221552.1973203-6-contact@jookia.org
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/net/can/Kconfig

@@ -174,10 +174,10 @@ config CAN_SLCAN
 
 config CAN_SUN4I
 	tristate "Allwinner A10 CAN controller"
-	depends on MACH_SUN4I || MACH_SUN7I || COMPILE_TEST
+	depends on MACH_SUN4I || MACH_SUN7I || RISCV || COMPILE_TEST
 	help
 	  Say Y here if you want to use CAN controller found on Allwinner
-	  A10/A20 SoCs.
+	  A10/A20/D1 SoCs.
 
 	  To compile this driver as a module, choose M here: the module will
 	  be called sun4i_can.

drivers/net/can/sun4i_can.c

@@ -91,6 +91,8 @@
 #define SUN4I_REG_BUF12_ADDR	0x0070	/* CAN Tx/Rx Buffer 12 */
 #define SUN4I_REG_ACPC_ADDR	0x0040	/* CAN Acceptance Code 0 */
 #define SUN4I_REG_ACPM_ADDR	0x0044	/* CAN Acceptance Mask 0 */
+#define SUN4I_REG_ACPC_ADDR_D1	0x0028	/* CAN Acceptance Code 0 on the D1 */
+#define SUN4I_REG_ACPM_ADDR_D1	0x002C	/* CAN Acceptance Mask 0 on the D1 */
 #define SUN4I_REG_RBUF_RBACK_START_ADDR	0x0180	/* CAN transmit buffer start */
 #define SUN4I_REG_RBUF_RBACK_END_ADDR	0x01b0	/* CAN transmit buffer end */
 
@@ -779,6 +781,11 @@ static const struct sun4ican_quirks sun4ican_quirks_r40 = {
 	.acp_offset = 0,
 };
 
+static const struct sun4ican_quirks sun4ican_quirks_d1 = {
+	.has_reset = true,
+	.acp_offset = (SUN4I_REG_ACPC_ADDR_D1 - SUN4I_REG_ACPC_ADDR),
+};
+
 static const struct of_device_id sun4ican_of_match[] = {
 	{
 		.compatible = "allwinner,sun4i-a10-can",
@@ -789,6 +796,9 @@ static const struct of_device_id sun4ican_of_match[] = {
 	}, {
 		.compatible = "allwinner,sun8i-r40-can",
 		.data = &sun4ican_quirks_r40
+	}, {
+		.compatible = "allwinner,sun20i-d1-can",
+		.data = &sun4ican_quirks_d1
 	}, {
 		/* sentinel */
 	},
@@ -915,4 +925,4 @@ module_platform_driver(sun4i_can_driver);
 MODULE_AUTHOR("Peter Chen <xingkongcp@gmail.com>");
 MODULE_AUTHOR("Gerhard Bertelsmann <info@gerhard-bertelsmann.de>");
 MODULE_LICENSE("Dual BSD/GPL");
-MODULE_DESCRIPTION("CAN driver for Allwinner SoCs (A10/A20)");
+MODULE_DESCRIPTION("CAN driver for Allwinner SoCs (A10/A20/D1)");