添加rtthread相关代码

riscv/rtthread/components/drivers/serial/serial_dm.c

@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-11-16     GuEe-GUI     first version
+ */
+
+#include <rtatomic.h>
+#include "serial_dm.h"
+
+int serial_dev_set_name(struct rt_serial_device *sdev)
+{
+    int id = -1;
+    static int uid_min = -1;
+    static volatile rt_atomic_t uid = 0;
+
+    RT_ASSERT(sdev != RT_NULL);
+
+#ifdef RT_USING_OFW
+    if (sdev->parent.ofw_node)
+    {
+        id = rt_ofw_get_alias_id(sdev->parent.ofw_node, "serial");
+
+        if (id < 0)
+        {
+            id = rt_ofw_get_alias_id(sdev->parent.ofw_node, "uart");
+        }
+
+        if (uid_min < 0)
+        {
+            uid_min = rt_ofw_get_alias_last_id("serial");
+
+            if (uid_min < 0)
+            {
+                uid_min = rt_ofw_get_alias_last_id("uart");
+            }
+
+            uid_min = uid_min < 0 ? 0 : (uid_min + 1);
+
+            rt_hw_atomic_store(&uid, uid_min);
+        }
+    }
+#endif
+
+    if (id < 0)
+    {
+        id = (int)rt_hw_atomic_add(&uid, 1);
+    }
+
+    return rt_dm_dev_set_name(&sdev->parent, "uart%u", id);
+}
+
+void *serial_base_from_args(char *str)
+{
+    rt_ubase_t base = 0;
+
+    while (*str && !(*str == 'x' || *str == 'X'))
+    {
+        ++str;
+    }
+    ++str;
+
+    /* The str may get from bootargs that we need check it */
+    while (*str)
+    {
+        if ((*str >= 'a' && *str <= 'f') || (*str >= 'A' && *str <= 'F'))
+        {
+            base = (base << 4) | (((*str | ' ') - 'a') + 10);
+        }
+        else if (*str >= '0' && *str <= '9')
+        {
+            base = (base << 4) | (*str - '0');
+        }
+        else break;
+
+        ++str;
+    }
+
+    return (void *)base;
+}
+
+struct serial_configure serial_cfg_from_args(char *str)
+{
+    struct serial_configure cfg = RT_SERIAL_CONFIG_DEFAULT;
+
+    /* Format baudrate/parity/bits/flow (BBBBPNF), Default is 115200n8 */
+    if (str && *str)
+    {
+        rt_uint32_t baudrate = 0;
+
+        /* BBBB is the speed */
+        while (*str && (*str >= '0' && *str <= '9'))
+        {
+            baudrate *= 10;
+            baudrate += *str - '0';
+            ++str;
+        }
+
+        if (baudrate)
+        {
+            cfg.baud_rate = baudrate;
+        }
+
+        /* P is parity (n/o/e) */
+        switch (*str)
+        {
+        case 'n':
+            cfg.parity = PARITY_NONE;
+            break;
+        case 'o':
+            cfg.parity = PARITY_ODD;
+            break;
+        case 'e':
+            cfg.parity = PARITY_EVEN;
+            break;
+        default:
+            --str;
+            break;
+        }
+        ++str;
+
+        /* N is number of bits */
+        if (*str && (*str >= '0' && *str <= '9'))
+        {
+            cfg.data_bits = *str - '0';
+            ++str;
+        }
+
+        /* F is flow ontrol ('r' for RTS) */
+        if (*str)
+        {
+            cfg.flowcontrol = (*str == 'r' ? RT_SERIAL_FLOWCONTROL_CTSRTS : RT_SERIAL_FLOWCONTROL_NONE);
+            ++str;
+        }
+
+    #ifdef RT_USING_OFW
+        if (*str == '\0')
+        {
+            const char earlycon_magic[] = { 'O', 'F', 'W', '\0' };
+
+            if (!rt_strcmp(++str, earlycon_magic))
+            {
+                /* Is OFW earlycon, we should ACK it */
+                rt_memset(str, 0, RT_ARRAY_SIZE(earlycon_magic));
+            }
+        }
+    #endif
+    }
+
+    return cfg;
+}