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+/*
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+ * NS16550 Serial Port
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+ * originally from linux source (arch/ppc/boot/ns16550.h)
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+ * modified slightly to
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+ * have addresses as offsets from CFG_ISA_BASE
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+ * added a few more definitions
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+ * added prototypes for ns16550.c
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+ * reduced no of com ports to 2
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+ * modifications (c) Rob Taylor, Flying Pig Systems. 2000.
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+ * further modified to support the 8245 duart
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+ * modifications (c) Paul Jimenez, Musenki, Inc. 2001.
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+ */
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+
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+
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+struct NS16550
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+ {
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+ unsigned char rbrthrdlb; /* 0 */
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+ unsigned char ierdmb; /* 1 */
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+ unsigned char iirfcrafr; /* 2 */
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+ unsigned char lcr; /* 3 */
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+ unsigned char mcr; /* 4 */
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+ unsigned char lsr; /* 5 */
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+ unsigned char msr; /* 6 */
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+ unsigned char scr; /* 7 */
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+ unsigned char reserved[2]; /* 8 & 9 */
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+ unsigned char dsr; /* 10 */
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+ unsigned char dcr; /* 11 */
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+ };
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+
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+
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+#define rbr rbrthrdlb
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+#define thr rbrthrdlb
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+#define dll rbrthrdlb
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+#define ier ierdmb
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+#define dlm ierdmb
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+#define iir iirfcrafr
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+#define fcr iirfcrafr
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+#define afr iirfcrafr
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+
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+#define FCR_FIFO_EN 0x01 /*fifo enable*/
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+#define FCR_RXSR 0x02 /*reciever soft reset*/
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+#define FCR_TXSR 0x04 /*transmitter soft reset*/
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+#define FCR_DMS 0x08 /* DMA Mode Select */
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+
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+#define MCR_RTS 0x02 /* Readyu to Send */
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+#define MCR_LOOP 0x10 /* Local loopback mode enable */
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+/* #define MCR_DTR 0x01 noton 8245 duart */
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+/* #define MCR_DMA_EN 0x04 noton 8245 duart */
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+/* #define MCR_TX_DFR 0x08 noton 8245 duart */
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+
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+#define LCR_WLS_MSK 0x03 /* character length slect mask*/
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+#define LCR_WLS_5 0x00 /* 5 bit character length */
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+#define LCR_WLS_6 0x01 /* 6 bit character length */
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+#define LCR_WLS_7 0x02 /* 7 bit character length */
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+#define LCR_WLS_8 0x03 /* 8 bit character length */
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+#define LCR_STB 0x04 /* Number of stop Bits, off = 1, on = 1.5 or 2) */
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+#define LCR_PEN 0x08 /* Parity eneble*/
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+#define LCR_EPS 0x10 /* Even Parity Select*/
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+#define LCR_STKP 0x20 /* Stick Parity*/
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+#define LCR_SBRK 0x40 /* Set Break*/
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+#define LCR_BKSE 0x80 /* Bank select enable - aka DLAB on 8245 */
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+
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+#define LSR_DR 0x01 /* Data ready */
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+#define LSR_OE 0x02 /* Overrun */
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+#define LSR_PE 0x04 /* Parity error */
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+#define LSR_FE 0x08 /* Framing error */
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+#define LSR_BI 0x10 /* Break */
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+#define LSR_THRE 0x20 /* Xmit holding register empty */
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+#define LSR_TEMT 0x40 /* Xmitter empty */
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+#define LSR_ERR 0x80 /* Error */
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+
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+/* useful defaults for LCR*/
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+#define LCR_8N1 0x03
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+
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+
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+volatile struct NS16550 * NS16550_init(int chan, int baud_divisor);
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+void NS16550_putc(volatile struct NS16550 *com_port, unsigned char c);
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+unsigned char NS16550_getc(volatile struct NS16550 *com_port);
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+int NS16550_tstc(volatile struct NS16550 *com_port);
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+void NS16550_reinit(volatile struct NS16550 *com_port, int baud_divisor);
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+
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