include/uapi/linux/serial_reg.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/serial_reg.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/serial_reg.h
Extension
.h
Size
16023 bytes
Lines
388
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _LINUX_SERIAL_REG_H
#define _LINUX_SERIAL_REG_H

/*
 * DLAB=0
 */
#define UART_RX		0	/* In:  Receive buffer */
#define UART_TX		0	/* Out: Transmit buffer */

#define UART_IER	1	/* Out: Interrupt Enable Register */
#define UART_IER_MSI		0x08 /* Enable Modem status interrupt */
#define UART_IER_RLSI		0x04 /* Enable receiver line status interrupt */
#define UART_IER_THRI		0x02 /* Enable Transmitter holding register int. */
#define UART_IER_RDI		0x01 /* Enable receiver data interrupt */
/*
 * Sleep mode for ST16650 and TI16750.  For the ST16650, EFR[4]=1
 */
#define UART_IERX_SLEEP		0x10 /* Enable sleep mode */

#define UART_IIR	2	/* In:  Interrupt ID Register */
#define UART_IIR_NO_INT		0x01 /* No interrupts pending */
#define UART_IIR_ID		0x0e /* Mask for the interrupt ID */
#define UART_IIR_MSI		0x00 /* Modem status interrupt */
#define UART_IIR_THRI		0x02 /* Transmitter holding register empty */
#define UART_IIR_RDI		0x04 /* Receiver data interrupt */
#define UART_IIR_RLSI		0x06 /* Receiver line status interrupt */

#define UART_IIR_BUSY		0x07 /* DesignWare APB Busy Detect */

#define UART_IIR_RX_TIMEOUT	0x0c /* OMAP RX Timeout interrupt */
#define UART_IIR_XOFF		0x10 /* OMAP XOFF/Special Character */
#define UART_IIR_CTS_RTS_DSR	0x20 /* OMAP CTS/RTS/DSR Change */
#define UART_IIR_64BYTE_FIFO	0x20 /* 16750 64 bytes FIFO */
#define UART_IIR_FIFO_ENABLED	0xc0 /* FIFOs enabled / port type identification */
#define  UART_IIR_FIFO_ENABLED_8250	0x00	/* 8250: no FIFO */
#define  UART_IIR_FIFO_ENABLED_16550	0x80	/* 16550: (broken/unusable) FIFO */
#define  UART_IIR_FIFO_ENABLED_16550A	0xc0	/* 16550A: FIFO enabled */
#define  UART_IIR_FIFO_ENABLED_16750	0xe0	/* 16750: 64 bytes FIFO enabled */

#define UART_FCR	2	/* Out: FIFO Control Register */
#define UART_FCR_ENABLE_FIFO	0x01 /* Enable the FIFO */
#define UART_FCR_CLEAR_RCVR	0x02 /* Clear the RCVR FIFO */
#define UART_FCR_CLEAR_XMIT	0x04 /* Clear the XMIT FIFO */
#define UART_FCR_DMA_SELECT	0x08 /* For DMA applications */
/*
 * Note: The FIFO trigger levels are chip specific:
 *	RX:76 = 00  01  10  11	TX:54 = 00  01  10  11
 * PC16550D:	 1   4   8  14		xx  xx  xx  xx
 * TI16C550A:	 1   4   8  14          xx  xx  xx  xx
 * TI16C550C:	 1   4   8  14          xx  xx  xx  xx
 * ST16C550:	 1   4   8  14		xx  xx  xx  xx
 * ST16C650:	 8  16  24  28		16   8  24  30	PORT_16650V2
 * NS16C552:	 1   4   8  14		xx  xx  xx  xx
 * ST16C654:	 8  16  56  60		 8  16  32  56	PORT_16654
 * TI16C750:	 1  16  32  56		xx  xx  xx  xx	PORT_16750
 * TI16C752:	 8  16  56  60		 8  16  32  56
 * OX16C950:	16  32 112 120		16  32  64 112	PORT_16C950
 * Tegra:	 1   4   8  14		16   8   4   1	PORT_TEGRA
 */
#define UART_FCR_R_TRIG_00	0x00
#define UART_FCR_R_TRIG_01	0x40
#define UART_FCR_R_TRIG_10	0x80
#define UART_FCR_R_TRIG_11	0xc0
#define UART_FCR_T_TRIG_00	0x00
#define UART_FCR_T_TRIG_01	0x10
#define UART_FCR_T_TRIG_10	0x20
#define UART_FCR_T_TRIG_11	0x30

#define UART_FCR_TRIGGER_MASK	0xC0 /* Mask for the FIFO trigger range */
#define UART_FCR_TRIGGER_1	0x00 /* Mask for trigger set at 1 */
#define UART_FCR_TRIGGER_4	0x40 /* Mask for trigger set at 4 */
#define UART_FCR_TRIGGER_8	0x80 /* Mask for trigger set at 8 */
#define UART_FCR_TRIGGER_14	0xC0 /* Mask for trigger set at 14 */
/* 16650 definitions */
#define UART_FCR6_R_TRIGGER_8	0x00 /* Mask for receive trigger set at 1 */
#define UART_FCR6_R_TRIGGER_16	0x40 /* Mask for receive trigger set at 4 */
#define UART_FCR6_R_TRIGGER_24  0x80 /* Mask for receive trigger set at 8 */
#define UART_FCR6_R_TRIGGER_28	0xC0 /* Mask for receive trigger set at 14 */
#define UART_FCR6_T_TRIGGER_16	0x00 /* Mask for transmit trigger set at 16 */
#define UART_FCR6_T_TRIGGER_8	0x10 /* Mask for transmit trigger set at 8 */
#define UART_FCR6_T_TRIGGER_24  0x20 /* Mask for transmit trigger set at 24 */
#define UART_FCR6_T_TRIGGER_30	0x30 /* Mask for transmit trigger set at 30 */
#define UART_FCR7_64BYTE	0x20 /* Go into 64 byte mode (TI16C750 and
					some Freescale UARTs) */

#define UART_FCR_R_TRIG_SHIFT		6
#define UART_FCR_R_TRIG_BITS(x)		\
	(((x) & UART_FCR_TRIGGER_MASK) >> UART_FCR_R_TRIG_SHIFT)
#define UART_FCR_R_TRIG_MAX_STATE	4

Annotation

Implementation Notes