1 files changed, 178 insertions, 0 deletions
diff --git a/bsp/ls2kdev/drivers/drv_uart.c b/bsp/ls2kdev/drivers/drv_uart.c
new file mode 100644
index 0000000000..428393dcc4
--- /dev/null
+++ b/bsp/ls2kdev/drivers/drv_uart.c
@@ -0,0 +1,178 @@
+/*
+ * Copyright (c) 2006-2020, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2020-04-05     bigmagic     Initial version
+ */
+
+/**
+ * @addtogroup ls2k
+ */
+
+/*@{*/
+
+#include <rtthread.h>
+#include <rtdevice.h>
+#include <rthw.h>
+#include "drv_uart.h"
+
+#define TRUE 1
+#define FALSE 0
+
+struct rt_uart_ls2k
+{
+    void *base;
+    rt_uint32_t IRQ;
+};
+
+static rt_err_t mipssim_uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
+{
+    struct rt_uart_ls2k *uart_dev = RT_NULL;
+
+    RT_ASSERT(serial != RT_NULL);
+    RT_ASSERT(cfg != RT_NULL);
+
+    uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
+
+    UART_IER(uart_dev->base) = 0; /* clear interrupt */
+    UART_FCR(uart_dev->base) = 0xc1; /* reset UART Rx/Tx */
+    /* set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */
+    UART_LCR(uart_dev->base) = 0x3;
+    UART_MCR(uart_dev->base) = 0x3;
+    UART_LSR(uart_dev->base) = 0x60;
+    UART_MSR(uart_dev->base) = 0xb0;
+
+    return RT_EOK;
+}
+
+static rt_err_t mipssim_uart_control(struct rt_serial_device *serial, int cmd, void *arg)
+{
+    struct rt_uart_ls2k *uart_dev = RT_NULL;
+
+    RT_ASSERT(serial != RT_NULL);
+    uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
+
+    switch (cmd)
+    {
+    case RT_DEVICE_CTRL_CLR_INT: /* Disable RX IRQ */
+        rt_hw_interrupt_mask(uart_dev->IRQ);
+        break;
+
+    case RT_DEVICE_CTRL_SET_INT: /* Enable RX IRQ */
+        rt_hw_interrupt_umask(uart_dev->IRQ);
+        UART_IER(uart_dev->base) |= (IER_IRxE|IER_ILE);
+        break;
+
+    default:
+        break;
+    }
+
+    return RT_EOK;
+
+}
+
+static rt_bool_t uart_is_transmit_empty(struct rt_uart_ls2k *uart_dev)
+{
+    unsigned char status = UART_LSR(uart_dev->base);
+
+    if (status & (UARTLSR_TE | UARTLSR_TFE))
+    {
+        return TRUE;
+    }
+    else
+    {
+        return FALSE;
+    }
+}
+
+static int mipssim_uart_putc(struct rt_serial_device *serial, char c)
+{
+    struct rt_uart_ls2k *uart_dev = RT_NULL;
+
+    RT_ASSERT(serial != RT_NULL);
+
+    uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
+
+    while (FALSE == uart_is_transmit_empty(uart_dev))
+        ;
+
+    UART_DAT(uart_dev->base) = c;
+
+    return 1;
+}
+
+static int mipssim_uart_getc(struct rt_serial_device *serial)
+{
+    struct rt_uart_ls2k *uart_dev = RT_NULL;
+
+    RT_ASSERT(serial != RT_NULL);
+
+    uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
+
+    if (LSR_RXRDY & UART_LSR(uart_dev->base))
+    {
+        return UART_DAT(uart_dev->base);
+    }
+
+    return -1;
+}
+
+/* UART interrupt handler */
+static void uart_irq_handler(int vector, void *param)
+{
+    struct rt_serial_device *serial = (struct rt_serial_device *)param;
+    struct rt_uart_ls2k *uart_dev = RT_NULL;
+
+    RT_ASSERT(serial != RT_NULL);
+
+    uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
+    unsigned char iir = UART_IIR(uart_dev->base);
+
+    /* Find out interrupt reason */
+    if ((IIR_RXTOUT & iir) || (IIR_RXRDY & iir))
+    {
+        rt_interrupt_enter();
+        rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
+        rt_interrupt_leave();
+    }
+
+}
+
+static const struct rt_uart_ops mipssim_uart_ops =
+{
+    mipssim_uart_configure,
+    mipssim_uart_control,
+    mipssim_uart_putc,
+    mipssim_uart_getc,
+};
+
+struct rt_uart_ls2k uart_dev0 =
+{
+    (void *)UART0_BASE,
+    4,
+};
+struct rt_serial_device serial;
+
+
+void rt_hw_uart_init(void)
+{
+    struct rt_uart_ls2k *uart;
+    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
+
+    uart = &uart_dev0;
+
+    serial.ops    = &mipssim_uart_ops;
+    serial.config = config;
+
+    rt_hw_interrupt_install(uart->IRQ, uart_irq_handler, &serial, "UART");
+
+    /* register UART device */
+    rt_hw_serial_register(&serial,
+                          "uart",
+                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
+                          uart);
+}
+/*@}*/