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-rw-r--r--include/ns16550.h112
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);