GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

mcu/riscv/drivers/serial/Makefile

@@ -0,0 +1 @@
+SRCS-y += serial.c 

mcu/riscv/drivers/serial/serial.c

@@ -0,0 +1,199 @@
+
+/* serial.c - print to uart */
+#include <platform.h>
+#include <serial.h>
+#include <common.h>
+
+
+static int serial_test_enable(void)
+{
+#ifdef CONFIG_SERIAL_DISABLE
+	return 0;
+#else
+	return 1;
+#endif
+}
+
+static void pl01x_putc(char c)
+{
+	/* Wait until there is space in the FIFO */
+	while (readl(UART_PL01x_FR) & UART_PL01x_FR_TXFF);
+
+	/* Send the character */
+	writel(c, UART_PL01x_DR);
+}
+
+static u32 pl01x_getc(void)
+{
+    u32 data;
+
+    while (readl(UART_PL01x_FR) & UART_PL01x_FR_RXFE) {
+        /* Wait until there is data in the FIFO */
+    }
+
+    data = readl(UART_PL01x_DR);
+
+    /* Check for an error flag */
+    if (data & 0xFFFFFF00) {
+	/* Clear the error */
+	writel(0xFFFFFFFF, UART_PL01x_ECR);
+	return 0;
+    }
+
+    return data;
+}
+void serial_putc(const char c)
+{
+	if (!serial_test_enable())
+		return;
+
+	if (c == '\n')
+		pl01x_putc('\r');
+
+	pl01x_putc(c);
+}
+
+char serial_getc(void)
+{
+    return (pl01x_getc() & 0xFF);
+}
+
+void serial_puts(const char *s)
+{
+	if (!serial_test_enable())
+		return;
+
+	if (s == NULL)
+		return;
+	while (*s) {
+		serial_putc(*s);
+		s++;
+	}
+}
+
+void serial_puts_always(const char *s)
+{
+	if (s == NULL)
+		return;
+
+	while (*s) {
+		if (*s == '\n')
+			pl01x_putc('\r');
+
+		pl01x_putc(*s);
+
+		s++;
+	}
+}
+
+void serial_put_dec(u32 dec)
+{
+	u32 num = dec;
+	char c[20] = {0}; /* size 20 */
+	int i = 0;
+
+	if (!serial_test_enable())
+		return;
+
+	if (num == 0) {
+		pl01x_putc('0');
+		return;
+	}
+
+	while (num) {
+		c[i] = '0' + (num % 10); /* bit size 10 */
+		++i;
+		num /= 10; /* bit size 10 */
+	}
+
+	for (i -= 1; i >= 0; --i)
+		pl01x_putc(c[i]);
+}
+
+void serial_put_hex(u32 hex)
+{
+	int i;
+	char c;
+
+	if (!serial_test_enable())
+		return;
+
+	for (i = 28; i >= 0; i -= 4) { /* bit size 28 4 */
+		c = ((unsigned int)hex >> (unsigned int)i) & 0x0F;
+		if (c < 10) /* bit size 10 */
+			c += '0';
+		else
+			c += 'A' - 10; /* bit size 10 */
+		pl01x_putc(c);
+	}
+}
+
+void serial_put_hex_always(u32 hex)
+{
+	int i;
+	char c;
+
+	for (i = 28; i >= 0; i -= 4) { /* bit size 28 4 */
+		c = ((unsigned int)hex >> (unsigned int)i) & 0x0F;
+		if (c < 10) /* bit size 10 */
+			c += '0';
+		else
+			c += 'A' - 10; /* bit size 10 */
+		pl01x_putc(c);
+	}
+}
+
+static void _serial_crg_init(void)
+{
+	u32 tmp;
+
+	/* configure pinmux of uart */
+	/* writel(0x1502, 0x112C00F0);
+	 * writel(0x1402, 0x119800E0); */
+
+	/* enable uart clock */
+	tmp = readl(REG_PERI_CRG110);
+	tmp |= 1 << 3;
+	writel(tmp, REG_PERI_CRG110);
+
+	/* cancel uart reset */
+	tmp = readl(REG_PERI_CRG110);
+	tmp &= ~(1 << 11);
+	writel(tmp, REG_PERI_CRG110);
+}
+
+void serial_init(void)
+{
+	u32 tmp;
+	u32 divider;
+	u32 remainder;
+	u32 fraction;
+
+	_serial_crg_init();
+
+	/* first, disable everything */
+	writel(0, UART_PL01x_CR);
+
+	/*
+	 * Set baud rate
+	 *
+	 * IBRD = UART_CLK / (16 * BAUD_RATE)
+	 * FBRD = RND((64 * MOD(UART_CLK,(16 * BAUD_RATE)))
+	 *               / (16 * BAUD_RATE))
+	 */
+	tmp = 16 * UART_BAUDRATE;
+	divider = UART_CLOCK / tmp;
+	remainder = UART_CLOCK % tmp;
+	tmp = (8 * remainder) / UART_BAUDRATE;
+	fraction = (tmp >> 1) + (tmp & 1);
+
+	writel(divider, UART_PL01x_IBRD);
+	writel(fraction, UART_PL01x_FBRD);
+
+	writel(UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN, UART_PL01x_LCRH);
+	/* Finally, enable the UART */
+	writel(UART_PL011_CR_UARTEN | UART_PL011_CR_TXE |
+			UART_PL011_CR_RXE, UART_PL01x_CR);
+
+	return;
+}