1 files changed, 85 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-viai2c-common.h b/drivers/i2c/busses/i2c-viai2c-common.h
new file mode 100644
index 000000000000..81e827c54434
--- /dev/null
+++ b/drivers/i2c/busses/i2c-viai2c-common.h
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __I2C_VIAI2C_COMMON_H_
+#define __I2C_VIAI2C_COMMON_H_
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+
+/* REG_CR Bit fields */
+#define VIAI2C_REG_CR		0x00
+#define VIAI2C_CR_ENABLE		BIT(0)
+#define VIAI2C_CR_RX_END		BIT(1)
+#define VIAI2C_CR_TX_END		BIT(2)
+#define VIAI2C_CR_CPU_RDY		BIT(3)
+#define VIAI2C_CR_END_MASK		GENMASK(2, 1)
+
+/* REG_TCR Bit fields */
+#define VIAI2C_REG_TCR		0x02
+#define VIAI2C_TCR_HS_MODE		BIT(13)
+#define VIAI2C_TCR_READ			BIT(14)
+#define VIAI2C_TCR_FAST			BIT(15)
+#define VIAI2C_TCR_ADDR_MASK		GENMASK(6, 0)
+
+/* REG_CSR Bit fields */
+#define VIAI2C_REG_CSR		0x04
+#define VIAI2C_CSR_RCV_NOT_ACK		BIT(0)
+#define VIAI2C_CSR_RCV_ACK_MASK		BIT(0)
+#define VIAI2C_CSR_READY_MASK		BIT(1)
+
+/* REG_ISR Bit fields */
+#define VIAI2C_REG_ISR		0x06
+#define VIAI2C_ISR_NACK_ADDR		BIT(0)
+#define VIAI2C_ISR_BYTE_END		BIT(1)
+#define VIAI2C_ISR_SCL_TIMEOUT		BIT(2)
+#define VIAI2C_ISR_MASK_ALL		GENMASK(2, 0)
+
+/* REG_IMR Bit fields */
+#define VIAI2C_REG_IMR		0x08
+#define VIAI2C_IMR_BYTE			BIT(1)
+#define VIAI2C_IMR_ENABLE_ALL		GENMASK(2, 0)
+
+#define VIAI2C_REG_CDR		0x0A
+#define VIAI2C_REG_TR		0x0C
+#define VIAI2C_REG_MCR		0x0E
+
+#define VIAI2C_TIMEOUT		(msecs_to_jiffies(1000))
+
+enum {
+	VIAI2C_PLAT_WMT,
+	VIAI2C_PLAT_ZHAOXIN
+};
+
+enum {
+	VIAI2C_BYTE_MODE,
+	VIAI2C_FIFO_MODE
+};
+
+struct viai2c {
+	struct i2c_adapter	adapter;
+	struct completion	complete;
+	struct device		*dev;
+	void __iomem		*base;
+	struct clk		*clk;
+	u16			tcr;
+	int			irq;
+	u16			xfered_len;
+	struct i2c_msg		*msg;
+	int			ret;
+	bool			last;
+	unsigned int		mode;
+	unsigned int		platform;
+	void			*pltfm_priv;
+};
+
+int viai2c_wait_bus_not_busy(struct viai2c *i2c);
+int viai2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num);
+int viai2c_init(struct platform_device *pdev, struct viai2c **pi2c, int plat);
+int viai2c_fifo_irq_xfer(struct viai2c *i2c, bool irq);
+
+#endif