bsp,abstract-machine: add rt_hw_board_init() and uart

* uart should be simplified

bsp/abstract-machine/src/init.c

@@ -1,7 +1,30 @@
-#include <klib.h>
+#include <am.h>
+#include <rtthread.h>
+
+#define RT_HW_HEAP_BEGIN heap.start
+#define RT_HW_HEAP_END heap.end
 
 void rt_hw_board_init() {
-  assert(0);
+  int rt_hw_uart_init(void);
+  rt_hw_uart_init();
+
+#ifdef RT_USING_HEAP
+  /* initialize memory system */
+  rt_system_heap_init(RT_HW_HEAP_BEGIN, RT_HW_HEAP_END);
+#endif
+
+#ifdef RT_USING_CONSOLE
+  /* set console device */
+  rt_console_set_device("uart");
+#endif /* RT_USING_CONSOLE */
+
+#ifdef RT_USING_COMPONENTS_INIT
+  rt_components_board_init();
+#endif
+
+#ifdef RT_USING_HEAP
+  rt_kprintf("heap: [0x%08x - 0x%08x]\n", (rt_ubase_t) RT_HW_HEAP_BEGIN, (rt_ubase_t) RT_HW_HEAP_END);
+#endif
 }
 
 int main() {

bsp/abstract-machine/src/uart.c

@@ -0,0 +1,166 @@
+/*
+ * Copyright (c) 2006-2020, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+#include <rthw.h>
+#include <rtdevice.h>
+#include <rtthread.h>
+
+#include "board.h"
+#include "drv_uart.h"
+
+#include <stdio.h>
+#ifdef RT_USING_SMART
+#include <ioremap.h>
+#endif
+#include "sbi.h"
+
+struct device_uart
+{
+    rt_ubase_t hw_base;
+    rt_uint32_t irqno;
+};
+
+void *uart0_base = (void*)0x10000000;
+struct rt_serial_device serial0;
+struct device_uart uart0;
+
+void uart_init(void)
+{
+    rt_uint32_t div = UART_REFERENCE_CLOCK / (UART_DEFAULT_BAUDRATE * 16);
+
+    write8_uart0(UART_IER, 0x00);
+    write8_uart0(UART_LCR, UART_LCR_BAUD_LATCH);
+
+    // LSB
+    write8_uart0(0, div & 0xff);
+    // MSB
+    write8_uart0(1, (div >> 8) & 0xff);
+
+    // set word length to 8 bits, no parity
+    write8_uart0(UART_LCR, UART_LCR_EIGHT_BITS);
+
+    write8_uart0(UART_FCR, UART_FCR_FIFO_ENABLE | UART_FCR_FIFO_CLEAR);
+
+    return;
+}
+
+static rt_err_t _uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
+{
+    uart_init();
+    return (RT_EOK);
+}
+
+static rt_err_t _uart_control(struct rt_serial_device *serial, int cmd, void *arg)
+{
+    struct device_uart *uart = (struct device_uart*)serial->parent.user_data;
+
+    switch (cmd)
+    {
+    case RT_DEVICE_CTRL_CLR_INT:
+        if ((size_t)arg == RT_DEVICE_FLAG_INT_RX)
+        {
+            rt_uint8_t value = read8_uart0(UART_IER);
+            write8_uart0(UART_IER, value & ~UART_IER_RX_ENABLE);
+        }
+        break;
+
+    case RT_DEVICE_CTRL_SET_INT:
+        if ((size_t)arg == RT_DEVICE_FLAG_INT_RX)
+        {
+            rt_uint8_t value = read8_uart0(UART_IER);
+            write8_uart0(UART_IER, value | UART_IER_RX_ENABLE);
+        }
+        break;
+    }
+
+    return (RT_EOK);
+}
+
+static int _uart_putc(struct rt_serial_device *serial, char c)
+{
+    struct device_uart *uart;
+    uart = (struct device_uart*)serial->parent.user_data;
+
+    // wait for Transmit Holding Empty to be set in LSR.
+    while((read8_uart0(UART_LSR) & UART_LSR_TX_IDLE) == 0)
+        ;
+    write8_uart0(UART_THR, c);
+
+    return (1);
+}
+
+static int _uart_getc(struct rt_serial_device *serial)
+{
+    struct device_uart *uart;
+    volatile rt_uint32_t lsr;
+    int ch = -1;
+
+    uart = (struct device_uart*)serial->parent.user_data;
+    lsr = read8_uart0(UART_LSR);
+
+    if (lsr & UART_LSR_RX_READY)
+    {
+        ch = read8_uart0(UART_RHR);
+    }
+    return ch;
+}
+
+const struct rt_uart_ops _uart_ops = {
+    _uart_configure,
+    _uart_control,
+    _uart_putc,
+    _uart_getc,
+    // TODO: add DMA support
+    RT_NULL};
+
+static void rt_hw_uart_isr(int irqno, void *param)
+{
+    rt_ubase_t level = rt_hw_interrupt_disable();
+
+    struct rt_serial_device *serial = (struct rt_serial_device *)param;
+
+    rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
+
+    rt_hw_interrupt_enable(level);
+}
+
+/*
+ * UART Initiation
+ */
+int rt_hw_uart_init(void)
+{
+    struct rt_serial_device *serial;
+    struct device_uart *uart;
+    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
+#ifdef RT_USING_SMART
+    uart0_base = rt_ioremap(uart0_base, 4096);
+#endif
+    // register device
+    serial = &serial0;
+    uart = &uart0;
+
+    serial->ops = &_uart_ops;
+    serial->config = config;
+    serial->config.baud_rate = UART_DEFAULT_BAUDRATE;
+    uart->hw_base = (rt_ubase_t)uart0_base;
+    uart->irqno = 0x0a;
+
+    rt_hw_serial_register(serial,
+                          RT_CONSOLE_DEVICE_NAME,
+                          RT_DEVICE_FLAG_STREAM | RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
+                          uart);
+    rt_hw_interrupt_install(uart->irqno, rt_hw_uart_isr, serial, RT_CONSOLE_DEVICE_NAME);
+    rt_hw_interrupt_umask(uart->irqno);
+    return 0;
+}
+
+/* WEAK for SDK 0.5.6 */
+rt_weak void uart_debug_init(int uart_channel)
+{
+}