From b76fd6ba0af6a99e47cff21c36cbcb4dcb54f700 Mon Sep 17 00:00:00 2001
From: Yilin Sun <imi415@imi.moe>
Date: Wed, 4 Sep 2024 15:56:47 +0800
Subject: [PATCH] bsp: nxp/mcx/mcxc: Add I2C driver support.

---
 bsp/nxp/mcx/mcxc/Libraries/drivers/drv_i2c.c | 152 +++++++++++++++++++
 1 file changed, 152 insertions(+)
 create mode 100644 bsp/nxp/mcx/mcxc/Libraries/drivers/drv_i2c.c

diff --git a/bsp/nxp/mcx/mcxc/Libraries/drivers/drv_i2c.c b/bsp/nxp/mcx/mcxc/Libraries/drivers/drv_i2c.c
new file mode 100644
index 0000000000..0c1b75cc55
--- /dev/null
+++ b/bsp/nxp/mcx/mcxc/Libraries/drivers/drv_i2c.c
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2006-2024 RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-09-03     Yilin Sun    Initial version
+ */
+
+#include <rtdevice.h>
+
+#include "fsl_i2c.h"
+
+#ifdef RT_USING_I2C
+
+#define BSP_DEFAULT_I2C_FREQ (100000)
+
+typedef struct
+{
+    struct rt_i2c_bus_device parent;
+    I2C_Type *instance;
+    uint32_t input_frequency;
+} mcx_i2c_obj_t;
+
+typedef struct
+{
+    I2C_Type *instance;
+    uint8_t id;
+} mcx_i2c_instance_t;
+
+static const mcx_i2c_instance_t mcx_i2c_instances[] =
+{
+#ifdef BSP_USING_I2C0
+    {I2C0, 0},
+#endif
+
+#ifdef BSP_USING_I2C1
+    {I2C1, 1},
+#endif
+};
+
+static mcx_i2c_obj_t mcx_i2c_list[ARRAY_SIZE(mcx_i2c_instances)];
+
+static int mcx_i2c_master_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
+{
+    struct rt_i2c_msg *msg;
+    i2c_master_transfer_t xfer = {0};
+    rt_uint32_t i;
+    rt_ssize_t ret = 0;
+
+    mcx_i2c_obj_t *i2c = (mcx_i2c_obj_t *)bus;
+
+    for (i = 0; i < num; i++)
+    {
+        msg = &msgs[i];
+
+        if (msg->flags & RT_I2C_RD)
+        {
+            xfer.slaveAddress = msg->addr;
+            xfer.direction = kI2C_Read;
+            xfer.subaddress = 0;
+            xfer.subaddressSize = 0;
+            xfer.data = msg->buf;
+            xfer.dataSize = msg->len;
+
+            xfer.flags = kI2C_TransferDefaultFlag;
+
+            if (i != 0)
+            {
+                xfer.flags |= kI2C_TransferRepeatedStartFlag;
+            }
+
+            if (i != num - 1)
+            {
+                xfer.flags |= kI2C_TransferNoStopFlag;
+            }
+
+
+            if (I2C_MasterTransferBlocking(i2c->instance, &xfer) != kStatus_Success)
+            {
+                return i;
+            }
+        }
+        else
+        {
+            xfer.slaveAddress = msg->addr;
+            xfer.direction = kI2C_Write;
+            xfer.subaddress = 0;
+            xfer.subaddressSize = 0;
+            xfer.data = msg->buf;
+            xfer.dataSize = msg->len;
+
+            xfer.flags = kI2C_TransferDefaultFlag;
+
+            if (i != 0)
+            {
+                xfer.flags |= kI2C_TransferRepeatedStartFlag;
+            }
+
+            if (i != num - 1)
+            {
+                xfer.flags |= kI2C_TransferNoStopFlag;
+            }
+
+            if (I2C_MasterTransferBlocking(i2c->instance, &xfer) != kStatus_Success)
+            {
+                return i;
+            }
+        }
+    }
+
+    ret = num;
+
+    return ret;
+}
+
+static const struct rt_i2c_bus_device_ops mcx_i2c_ops =
+{
+    mcx_i2c_master_xfer,
+    RT_NULL,
+    RT_NULL,
+};
+
+static int rt_hw_i2c_init(void)
+{
+    i2c_master_config_t master_cfg;
+    char name_buf[16];
+
+    for (size_t i = 0; i < ARRAY_SIZE(mcx_i2c_instances); i++)
+    {
+        mcx_i2c_list[i].input_frequency = CLOCK_GetCoreSysClkFreq();
+        mcx_i2c_list[i].instance = mcx_i2c_instances[i].instance;
+        mcx_i2c_list[i].parent.ops = &mcx_i2c_ops;
+
+        I2C_MasterGetDefaultConfig(&master_cfg);
+
+        master_cfg.baudRate_Bps = BSP_DEFAULT_I2C_FREQ;
+
+        I2C_MasterInit(mcx_i2c_list[i].instance, &master_cfg, mcx_i2c_list[i].input_frequency);
+
+        rt_snprintf(name_buf, 16, "i2c%d", mcx_i2c_instances[i].id);
+
+        rt_i2c_bus_device_register(&mcx_i2c_list[i].parent, name_buf);
+    }
+
+    return RT_EOK;
+}
+
+INIT_DEVICE_EXPORT(rt_hw_i2c_init);
+
+#endif