patch-2.4.5 linux/arch/ppc/boot/common/ns16550.c

• Lines: 81
• Date: Thu May 24 15:02:06 2001
• Orig file: v2.4.4/linux/arch/ppc/boot/common/ns16550.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.4/linux/arch/ppc/boot/common/ns16550.c linux/arch/ppc/boot/common/ns16550.c
@@ -0,0 +1,80 @@
+/*
+ * BK Id: SCCS/s.ns16550.c 1.7 05/18/01 06:20:29 patch
+ */
+/*
+ * COM1 NS16550 support
+ */
+
+#include <linux/config.h>
+#include <linux/serialP.h>
+#include <linux/serial_reg.h>
+#include <asm/serial.h>
+
+/* Some machines, such as ones with a PReP memory map, initally have
+ * their serial port at an offset of 0x80000000 from where they are
+ * in <asm/serial.h>.  This tries to take that into account. */
+#ifndef IOOFFSET
+#define IOOFFSET 0
+#endif
+
+static struct serial_state rs_table[RS_TABLE_SIZE] = {
+	SERIAL_PORT_DFNS	/* Defined in <asm/serial.h> */
+};
+
+static int shift;
+
+volatile unsigned long serial_init(int chan) {
+	unsigned long com_port;
+
+	/* Get the base, and add any offset we need to deal with. */
+	com_port = rs_table[chan].port + IOOFFSET;
+
+	/* How far apart the registers are. */
+	shift = rs_table[chan].iomem_reg_shift;
+
+	/* See if port is present */
+	*((unsigned char *)com_port + (UART_LCR << shift)) = 0x00;
+	*((unsigned char *)com_port + (UART_IER << shift)) = 0x00;
+	/* Access baud rate */
+	*((unsigned char *)com_port + (UART_LCR << shift)) = 0x00;
+#ifdef CONFIG_SERIAL_CONSOLE_NONSTD
+	/* Input clock. */
+	*((unsigned char *)com_port + (UART_DLL << shift)) = 
+			(BASE_BAUD / CONFIG_SERIAL_CONSOLE_BAUD);
+	*((unsigned char *)com_port + (UART_DLM << shift)) = 
+		(BASE_BAUD / CONFIG_SERIAL_CONSOLE_BAUD) >> 8;
+#endif
+	 /* 8 data, 1 stop, no parity */
+	*((unsigned char *)com_port + (UART_LCR << shift)) = 0x03;
+	/* RTS/DTR */
+	*((unsigned char *)com_port + (UART_MCR << shift)) = 0x03;
+	/* Clear & enable FIFOs */
+	*((unsigned char *)com_port + (UART_FCR << shift)) = 0x07;
+
+	return (com_port);
+}
+
+void
+serial_putc(volatile unsigned long com_port, unsigned char c)
+{
+	while ((*((volatile unsigned char *)com_port + (UART_LSR << shift)) &
+				UART_LSR_THRE) == 0)
+		;
+	*(volatile unsigned char *)com_port = c;
+}
+
+unsigned char
+serial_getc(volatile unsigned long com_port)
+{
+	while ((*((volatile unsigned char *)com_port + (UART_LSR << shift))
+			& UART_LSR_DR) == 0)
+		;
+	return (*(volatile unsigned char *)com_port);
+}
+
+int
+serial_tstc(volatile unsigned long com_port)
+{
+	return ((*((volatile unsigned char *)com_port + (UART_LSR << shift))
+				& UART_LSR_DR) != 0);
+}