allwinner: add I2C glue driver
Allwinner 64-bit SoCs all use the Mentor Graphics MI2CV I2C controller
core, with inverted clear quirk.
Add a glue driver for this.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
diff --git a/drivers/allwinner/sunxi_i2c.c b/drivers/allwinner/sunxi_i2c.c
new file mode 100644
index 0000000..cc91ca5
--- /dev/null
+++ b/drivers/allwinner/sunxi_i2c.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2018 Icenowy Zheng <icenowy@aosc.io>
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ * https://spdx.org/licenses
+ */
+
+/* This driver provides I2C support for Allwinner sunXi SoCs */
+
+#include <mmio.h>
+
+#define CONFIG_SYS_TCLK 24000000
+#define CONFIG_SYS_I2C_SPEED 100000
+#define CONFIG_SYS_I2C_SLAVE 0
+
+#define I2C_INTERRUPT_CLEAR_INVERTED
+
+struct mentor_i2c_regs {
+ uint32_t slave_address;
+ uint32_t xtnd_slave_addr;
+ uint32_t data;
+ uint32_t control;
+ uint32_t status;
+ uint32_t baudrate;
+ uint32_t soft_reset;
+};
+
+#include "../mentor/i2c/mi2cv.c"