feat: serial device interfacing

[lunaix-os.git] / lunaix-os / hal / char / uart / 16550_pmio.c

diff --git a/lunaix-os/hal/char/uart/16550_pmio.c b/lunaix-os/hal/char/uart/16550_pmio.c
new file mode 100644 (file)
index 0000000..4342d98
--- /dev/null
+++ b/lunaix-os/hal/char/uart/16550_pmio.c
@@ -0,0 +1,103 @@
+/**
+ * @file 16550_pmio.c
+ * @author Lunaixsky (lunaxisky@qq.com)
+ * @brief 16550 UART with port mapped IO
+ * @version 0.1
+ * @date 2023-08-30
+ *
+ * @copyright Copyright (c) 2023
+ *
+ */
+#include <lunaix/device.h>
+#include <lunaix/isrm.h>
+
+#include <sys/port_io.h>
+
+#include "16550.h"
+
+#define DELAY 50
+
+static DEFINE_LLIST(com_ports);
+
+static u32_t
+com_regread(struct uart16550* uart, ptr_t regoff)
+{
+    u8_t val = port_rdbyte(uart->base_addr + regoff);
+    port_delay(DELAY);
+
+    return (u32_t)val;
+}
+
+static void
+com_regwrite(struct uart16550* uart, ptr_t regoff, u32_t val)
+{
+    port_wrbyte(uart->base_addr + regoff, (u8_t)val);
+    port_delay(DELAY);
+}
+
+static void
+com_irq_handler(const isr_param* param)
+{
+    uart_general_irq_handler(param->execp->vector, &com_ports);
+}
+
+static int
+upiom_init(struct device_def* def)
+{
+    int irq3 = 3, irq4 = 4;
+    u16_t ioports[] = { 0x3F8, 0x2F8, 0x3E8, 0x2E8 };
+    int* irqs[] = { &irq4, &irq3, &irq4, &irq3 };
+
+    struct uart16550* uart = NULL;
+
+    // COM 1...4
+    for (size_t i = 0; i < 4; i++) {
+        if (!uart) {
+            uart = uart_alloc(ioports[i]);
+            uart->read_reg = com_regread;
+            uart->write_reg = com_regwrite;
+        } else {
+            uart->base_addr = ioports[i];
+        }
+
+        if (!uart_testport(uart, 0xe3)) {
+            continue;
+        }
+
+        int irq = *irqs[i];
+        if (irq) {
+            /*
+             *  Since these irqs are overlapped, this particular setup is needed
+             * to avoid double-bind
+             */
+            uart->iv = isrm_bindirq(irq, com_irq_handler);
+            *((volatile int*)irqs[i]) = 0;
+        }
+
+        uart_setup(uart);
+        uart_enable_fifo(uart, UART_FIFO8);
+        llist_append(&com_ports, &uart->local_ports);
+
+        struct serial_dev* sdev = serial_create();
+        sdev->backend = uart;
+        sdev->write = uart_general_tx;
+        sdev->exec_cmd = uart_general_exec_cmd;
+
+        uart->sdev = sdev;
+
+        uart = NULL;
+    }
+
+    if (uart) {
+        uart_free(uart);
+    }
+
+    return 0;
+}
+
+static struct device_def uart_pmio_def = {
+    .class = DEVCLASS(DEVIF_SOC, DEVFN_CHAR, DEV_SERIAL, 0),
+    .name = "16550 Generic UART (I/O)",
+    .init = upiom_init
+};
+EXPORT_DEVICE(uart16550_pmio, &uart_pmio_def, load_earlystage);
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