Initial revision

1 files changed, 112 insertions, 0 deletions

diff --git a/include/ns16550.h b/include/ns16550.h
new file mode 100644
index 0000000..b2e791a
--- /dev/null
+++ b/include/ns16550.h
@@ -0,0 +1,112 @@
+/*
+ * NS16550 Serial Port
+ * originally from linux source (arch/ppc/boot/ns16550.h)
+ * modified slightly to
+ * have addresses as offsets from CFG_ISA_BASE
+ * added a few more definitions
+ * added prototypes for ns16550.c
+ * reduced no of com ports to 2
+ * modifications (c) Rob Taylor, Flying Pig Systems. 2000.
+ */
+
+#if (CFG_NS16550_REG_SIZE == 1)
+struct NS16550 {
+	unsigned char rbr;		/* 0 */
+	unsigned char ier;		/* 1 */
+	unsigned char fcr;		/* 2 */
+	unsigned char lcr;		/* 3 */
+	unsigned char mcr;		/* 4 */
+	unsigned char lsr;		/* 5 */
+	unsigned char msr;		/* 6 */
+	unsigned char scr;		/* 7 */
+} __attribute__ ((packed));
+#elif (CFG_NS16550_REG_SIZE == 2)
+struct NS16550 {
+	unsigned short rbr;		/* 0 */
+	unsigned short ier;		/* 1 */
+	unsigned short fcr;		/* 2 */
+	unsigned short lcr;		/* 3 */
+	unsigned short mcr;		/* 4 */
+	unsigned short lsr;		/* 5 */
+	unsigned short msr;		/* 6 */
+	unsigned short scr;		/* 7 */
+} __attribute__ ((packed));
+#elif (CFG_NS16550_REG_SIZE == 4)
+struct NS16550 {
+	unsigned long rbr;		/* 0 */
+	unsigned long ier;		/* 1 */
+	unsigned long fcr;		/* 2 */
+	unsigned long lcr;		/* 3 */
+	unsigned long mcr;		/* 4 */
+	unsigned long lsr;		/* 5 */
+	unsigned long msr;		/* 6 */
+	unsigned long scr;		/* 7 */
+} __attribute__ ((packed));
+#elif (CFG_NS16550_REG_SIZE == -4)
+struct NS16550 {
+	unsigned char rbr;		/* 0 */
+	int pad1:24;
+	unsigned char ier;		/* 1 */
+	int pad2:24;
+	unsigned char fcr;		/* 2 */
+	int pad3:24;
+	unsigned char lcr;		/* 3 */
+	int pad4:24;
+	unsigned char mcr;		/* 4 */
+	int pad5:24;
+	unsigned char lsr;		/* 5 */
+	int pad6:24;
+	unsigned char msr;		/* 6 */
+	int pad7:24;
+	unsigned char scr;		/* 7 */
+	int pad8:24;
+} __attribute__ ((packed));
+#else
+#error "Please define NS16550 registers size."
+#endif
+
+#define thr rbr
+#define iir fcr
+#define dll rbr
+#define dlm ier
+
+typedef volatile struct NS16550 *NS16550_t;
+
+#define FCR_FIFO_EN     0x01		/* Fifo enable */
+#define FCR_RXSR        0x02		/* Receiver soft reset */
+#define FCR_TXSR        0x04		/* Transmitter soft reset */
+
+#define MCR_DTR         0x01
+#define MCR_RTS         0x02
+#define MCR_DMA_EN      0x04
+#define MCR_TX_DFR      0x08
+
+#define LCR_WLS_MSK	0x03		/* character length slect mask */
+#define LCR_WLS_5	0x00		/* 5 bit character length */
+#define LCR_WLS_6	0x01		/* 6 bit character length */
+#define LCR_WLS_7	0x02		/* 7 bit character length */
+#define LCR_WLS_8	0x03		/* 8 bit character length */
+#define LCR_STB		0x04		/* Number of stop Bits, off = 1, on = 1.5 or 2) */
+#define LCR_PEN		0x08		/* Parity eneble */
+#define LCR_EPS		0x10		/* Even Parity Select */
+#define LCR_STKP	0x20		/* Stick Parity */
+#define LCR_SBRK	0x40		/* Set Break */
+#define LCR_BKSE	0x80		/* Bank select enable */
+
+#define LSR_DR		0x01		/* Data ready */
+#define LSR_OE		0x02		/* Overrun */
+#define LSR_PE		0x04		/* Parity error */
+#define LSR_FE		0x08		/* Framing error */
+#define LSR_BI		0x10		/* Break */
+#define LSR_THRE	0x20		/* Xmit holding register empty */
+#define LSR_TEMT	0x40		/* Xmitter empty */
+#define LSR_ERR		0x80		/* Error */
+
+/* useful defaults for LCR */
+#define LCR_8N1		0x03
+
+void	NS16550_init   (NS16550_t com_port, int baud_divisor);
+void	NS16550_putc   (NS16550_t com_port, char c);
+char	NS16550_getc   (NS16550_t com_port);
+int	NS16550_tstc   (NS16550_t com_port);
+void	NS16550_reinit (NS16550_t com_port, int baud_divisor);