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Added a comment and cleaned up spacing

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This commit is contained in:
Joel Sherrill
1998-06-22 09:56:09 +00:00
parent cd58d821b0
commit aa0da6b2c2
4 changed files with 126 additions and 100 deletions
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c/src/lib/libchip/serial/ns16550.c
+4 -1
View File
@@ -1,5 +1,8 @@
/*
* This file contains the TTY driver for the NS16550
* This file contains the TTY driver for the National Semiconductor NS16550.
*
* This part is widely cloned and second sourced. It is found in a number
* of "Super IO" controllers.
*
* COPYRIGHT (c) 1998 by Radstone Technology
*
c/src/lib/libchip/serial/ns16550_p.h
+59 -49
View File
@@ -12,6 +12,7 @@
* and disclaimer, appears in all copies. Radstone Technology will provide
* no support for this code.
*
* $Id$
*/
#ifndef _NS16550_P_H_
@@ -20,6 +21,7 @@
#ifdef __cplusplus
extern "C" {
#endif
/*
* Define serial port read registers structure.
*/
@@ -44,6 +46,7 @@ typedef volatile struct _SP_READ_REGISTERS {
#define NS16550_LINE_STATUS 5
#define NS16550_MODEM_STATUS 6
#define NS16550_SCRATCH_PAD 7
/*
* Define serial port write registers structure.
*/
@@ -66,10 +69,10 @@ typedef volatile struct _SP_WRITE_REGISTERS {
* 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 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.
@@ -85,26 +88,29 @@ typedef struct _SP_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 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
#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 */
@@ -113,28 +119,31 @@ typedef struct _SP_INTERRUPT_ID {
/*
* 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 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
#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
{
@@ -144,41 +153,42 @@ typedef struct _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
int major,
int minor,
void * arg
);
static int ns16550_close(
int major,
int minor,
void * arg
int major,
int minor,
void * arg
);
static void ns16550_write_polled(
int minor,
char cChar
int minor,
char cChar
);
static int ns16550_assert_RTS(
int minor
int minor
);
static int ns16550_negate_RTS(
int minor
int minor
);
static int ns16550_assert_DTR(
int minor
int minor
);
static int ns16550_negate_DTR(
int minor
int minor
);
static void ns16550_initialize_interrupts(int minor);
@@ -186,19 +196,19 @@ 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
int minor,
const char *buf,
int len
);
static int ns16550_write_support_polled(
int minor,
const char *buf,
int len
);
int minor,
const char *buf,
int len
);
static int ns16550_inbyte_nonblocking_polled(
int minor
int minor
);
#ifdef __cplusplus
c/src/libchip/serial/ns16550.c
+4 -1
View File
@@ -1,5 +1,8 @@
/*
* This file contains the TTY driver for the NS16550
* This file contains the TTY driver for the National Semiconductor NS16550.
*
* This part is widely cloned and second sourced. It is found in a number
* of "Super IO" controllers.
*
* COPYRIGHT (c) 1998 by Radstone Technology
*
c/src/libchip/serial/ns16550_p.h
+59 -49
View File
@@ -12,6 +12,7 @@
* and disclaimer, appears in all copies. Radstone Technology will provide
* no support for this code.
*
* $Id$
*/
#ifndef _NS16550_P_H_
@@ -20,6 +21,7 @@
#ifdef __cplusplus
extern "C" {
#endif
/*
* Define serial port read registers structure.
*/
@@ -44,6 +46,7 @@ typedef volatile struct _SP_READ_REGISTERS {
#define NS16550_LINE_STATUS 5
#define NS16550_MODEM_STATUS 6
#define NS16550_SCRATCH_PAD 7
/*
* Define serial port write registers structure.
*/
@@ -66,10 +69,10 @@ typedef volatile struct _SP_WRITE_REGISTERS {
* 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 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.
@@ -85,26 +88,29 @@ typedef struct _SP_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 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
#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 */
@@ -113,28 +119,31 @@ typedef struct _SP_INTERRUPT_ID {
/*
* 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 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
#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
{
@@ -144,41 +153,42 @@ typedef struct _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
int major,
int minor,
void * arg
);
static int ns16550_close(
int major,
int minor,
void * arg
int major,
int minor,
void * arg
);
static void ns16550_write_polled(
int minor,
char cChar
int minor,
char cChar
);
static int ns16550_assert_RTS(
int minor
int minor
);
static int ns16550_negate_RTS(
int minor
int minor
);
static int ns16550_assert_DTR(
int minor
int minor
);
static int ns16550_negate_DTR(
int minor
int minor
);
static void ns16550_initialize_interrupts(int minor);
@@ -186,19 +196,19 @@ 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
int minor,
const char *buf,
int len
);
static int ns16550_write_support_polled(
int minor,
const char *buf,
int len
);
int minor,
const char *buf,
int len
);
static int ns16550_inbyte_nonblocking_polled(
int minor
int minor
);
#ifdef __cplusplus