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Diffstat (limited to 'c/src/lib/libchip/serial/ns16550_p.h')
| -rw-r--r-- | c/src/lib/libchip/serial/ns16550_p.h | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/c/src/lib/libchip/serial/ns16550_p.h b/c/src/lib/libchip/serial/ns16550_p.h new file mode 100644 index 0000000000..9e610119e0 --- /dev/null +++ b/c/src/lib/libchip/serial/ns16550_p.h @@ -0,0 +1,208 @@ +/* + * COPYRIGHT (c) 1998 by Radstone Technology + * + * + * THIS FILE IS PROVIDED TO YOU, THE USER, "AS IS", WITHOUT WARRANTY OF ANY + * KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK + * AS TO THE QUALITY AND PERFORMANCE OF ALL CODE IN THIS FILE IS WITH YOU. + * + * You are hereby granted permission to use, copy, modify, and distribute + * this file, provided that this notice, plus the above copyright notice + * and disclaimer, appears in all copies. Radstone Technology will provide + * no support for this code. + * + */ + +#ifndef _NS16550_P_H_ +#define _NS16550_P_H_ + +#ifdef __cplusplus +extern "C" { +#endif +/* + * Define serial port read registers structure. + */ + +typedef volatile struct _SP_READ_REGISTERS { + unsigned char ReceiveBuffer; + unsigned char InterruptEnable; + unsigned char InterruptId; + unsigned char LineControl; + unsigned char ModemControl; + unsigned char LineStatus; + unsigned char ModemStatus; + unsigned char ScratchPad; +} SP_READ_REGISTERS, *PSP_READ_REGISTERS; + + +#define NS16550_RECEIVE_BUFFER 0 +#define NS16550_INTERRUPT_ENABLE 1 +#define NS16550_INTERRUPT_ID 2 +#define NS16550_LINE_CONTROL 3 +#define NS16550_MODEM_CONTROL 4 +#define NS16550_LINE_STATUS 5 +#define NS16550_MODEM_STATUS 6 +#define NS16550_SCRATCH_PAD 7 +/* + * Define serial port write registers structure. + */ + +typedef volatile struct _SP_WRITE_REGISTERS { + unsigned char TransmitBuffer; + unsigned char InterruptEnable; + unsigned char FifoControl; + unsigned char LineControl; + unsigned char ModemControl; + unsigned char Reserved1; + unsigned char ModemStatus; + unsigned char ScratchPad; +} SP_WRITE_REGISTERS, *PSP_WRITE_REGISTERS; + +#define NS16550_TRANSMIT_BUFFER 0 +#define NS16550_FIFO_CONTROL 2 + +/* + * Define serial port interrupt enable register structure. + */ + +#define SP_INT_RX_ENABLE 0x01 +#define SP_INT_TX_ENABLE 0x02 +#define SP_INT_LS_ENABLE 0x04 +#define SP_INT_MS_ENABLE 0x08 + +/* + * Define serial port interrupt id register structure. + */ + +typedef struct _SP_INTERRUPT_ID { + unsigned char InterruptPending : 1; + unsigned char Identification : 3; + unsigned char Reserved1 : 2; + unsigned char FifoEnabled : 2; +} SP_INTERRUPT_ID, *PSP_INTERRUPT_ID; + +/* + * Define serial port fifo control register structure. + */ +#define SP_FIFO_ENABLE 0x01 +#define SP_FIFO_RXRST 0x02 +#define SP_FIFO_TXRST 0x04 +#define SP_FIFO_DMA 0x08 +#define SP_FIFO_RXLEVEL 0xc0 + +/* + * Define serial port line control register structure. + */ +#define SP_LINE_SIZE 0x03 +#define SP_LINE_STOP 0x04 +#define SP_LINE_PAR 0x08 +#define SP_LINE_ODD 0x10 +#define SP_LINE_STICK 0x20 +#define SP_LINE_BREAK 0x40 +#define SP_LINE_DLAB 0x80 + +/* + * Line status register character size definitions. + */ +#define FIVE_BITS 0x0 /* five bits per character */ +#define SIX_BITS 0x1 /* six bits per character */ +#define SEVEN_BITS 0x2 /* seven bits per character */ +#define EIGHT_BITS 0x3 /* eight bits per character */ + +/* + * Line speed divisor definition. + */ +#define NS16550_Baud(baud_rate) (115200/baud_rate) + +/* + * Define serial port modem control register structure. + */ +#define SP_MODEM_DTR 0x01 +#define SP_MODEM_RTS 0x02 +#define SP_MODEM_IRQ 0x08 +#define SP_MODEM_LOOP 0x10 +#define SP_MODEM_DIV4 0x80 + +/* + * Define serial port line status register structure. + */ +#define SP_LSR_RDY 0x01 +#define SP_LSR_EOVRUN 0x02 +#define SP_LSR_EPAR 0x04 +#define SP_LSR_EFRAME 0x08 +#define SP_LSR_BREAK 0x10 +#define SP_LSR_THOLD 0x20 +#define SP_LSR_TX 0x40 +#define SP_LSR_EFIFO 0x80 + +typedef struct _ns16550_context +{ + unsigned8 ucModemCtrl; +} ns16550_context; + +/* + * Driver functions + */ +static boolean ns16550_probe(int minor); + +static void ns16550_init(int minor); + +static int ns16550_open( + int major, + int minor, + void * arg +); + +static int ns16550_close( + int major, + int minor, + void * arg +); + +static void ns16550_write_polled( + int minor, + char cChar +); + +static int ns16550_assert_RTS( + int minor +); + +static int ns16550_negate_RTS( + int minor +); + +static int ns16550_assert_DTR( + int minor +); + +static int ns16550_negate_DTR( + int minor +); + +static void ns16550_initialize_interrupts(int minor); + +static int ns16550_flush(int major, int minor, void *arg); + +static int ns16550_write_support_int( + int minor, + const char *buf, + int len +); + +static int ns16550_write_support_polled( + int minor, + const char *buf, + int len + ); + +static int ns16550_inbyte_nonblocking_polled( + int minor +); + +#ifdef __cplusplus +} +#endif + +#endif /* _NS16550_P_H_ */ |