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ad4c2aa635
Reading the LSR clears the break, parity, frame error, and overrun bits in the 8250 chip, but these are not being saved in all places that read the LSR. Same goes for the MSR delta bits. Save the LSR bits off whenever the lsr is read so they can be handled later in the receive routine. Save the MSR bits to be handled in the modem status routine. Also, clear the stored bits and clear the interrupt registers before enabling interrupts, to avoid handling old values of the stored bits in the interrupt routines. [akpm@linux-foundation.org: clean up pre-existing code] Signed-off-by: Corey Minyard <minyard@acm.org> Cc: Russell King <rmk+lkml@arm.linux.org.uk> Cc: Yinghai Lu <yinghai.lu@sun.com> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com> Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
329 lines
13 KiB
C
329 lines
13 KiB
C
/*
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* include/linux/serial_reg.h
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*
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* Copyright (C) 1992, 1994 by Theodore Ts'o.
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*
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* Redistribution of this file is permitted under the terms of the GNU
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* Public License (GPL)
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*
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* These are the UART port assignments, expressed as offsets from the base
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* register. These assignments should hold for any serial port based on
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* a 8250, 16450, or 16550(A).
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*/
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#ifndef _LINUX_SERIAL_REG_H
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#define _LINUX_SERIAL_REG_H
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/*
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* DLAB=0
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*/
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#define UART_RX 0 /* In: Receive buffer */
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#define UART_TX 0 /* Out: Transmit buffer */
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#define UART_IER 1 /* Out: Interrupt Enable Register */
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#define UART_IER_MSI 0x08 /* Enable Modem status interrupt */
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#define UART_IER_RLSI 0x04 /* Enable receiver line status interrupt */
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#define UART_IER_THRI 0x02 /* Enable Transmitter holding register int. */
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#define UART_IER_RDI 0x01 /* Enable receiver data interrupt */
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/*
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* Sleep mode for ST16650 and TI16750. For the ST16650, EFR[4]=1
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*/
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#define UART_IERX_SLEEP 0x10 /* Enable sleep mode */
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#define UART_IIR 2 /* In: Interrupt ID Register */
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#define UART_IIR_NO_INT 0x01 /* No interrupts pending */
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#define UART_IIR_ID 0x06 /* Mask for the interrupt ID */
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#define UART_IIR_MSI 0x00 /* Modem status interrupt */
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#define UART_IIR_THRI 0x02 /* Transmitter holding register empty */
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#define UART_IIR_RDI 0x04 /* Receiver data interrupt */
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#define UART_IIR_RLSI 0x06 /* Receiver line status interrupt */
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#define UART_IIR_BUSY 0x07 /* DesignWare APB Busy Detect */
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#define UART_FCR 2 /* Out: FIFO Control Register */
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#define UART_FCR_ENABLE_FIFO 0x01 /* Enable the FIFO */
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#define UART_FCR_CLEAR_RCVR 0x02 /* Clear the RCVR FIFO */
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#define UART_FCR_CLEAR_XMIT 0x04 /* Clear the XMIT FIFO */
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#define UART_FCR_DMA_SELECT 0x08 /* For DMA applications */
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/*
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* Note: The FIFO trigger levels are chip specific:
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* RX:76 = 00 01 10 11 TX:54 = 00 01 10 11
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* PC16550D: 1 4 8 14 xx xx xx xx
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* TI16C550A: 1 4 8 14 xx xx xx xx
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* TI16C550C: 1 4 8 14 xx xx xx xx
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* ST16C550: 1 4 8 14 xx xx xx xx
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* ST16C650: 8 16 24 28 16 8 24 30 PORT_16650V2
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* NS16C552: 1 4 8 14 xx xx xx xx
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* ST16C654: 8 16 56 60 8 16 32 56 PORT_16654
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* TI16C750: 1 16 32 56 xx xx xx xx PORT_16750
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* TI16C752: 8 16 56 60 8 16 32 56
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*/
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#define UART_FCR_R_TRIG_00 0x00
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#define UART_FCR_R_TRIG_01 0x40
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#define UART_FCR_R_TRIG_10 0x80
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#define UART_FCR_R_TRIG_11 0xc0
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#define UART_FCR_T_TRIG_00 0x00
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#define UART_FCR_T_TRIG_01 0x10
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#define UART_FCR_T_TRIG_10 0x20
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#define UART_FCR_T_TRIG_11 0x30
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#define UART_FCR_TRIGGER_MASK 0xC0 /* Mask for the FIFO trigger range */
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#define UART_FCR_TRIGGER_1 0x00 /* Mask for trigger set at 1 */
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#define UART_FCR_TRIGGER_4 0x40 /* Mask for trigger set at 4 */
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#define UART_FCR_TRIGGER_8 0x80 /* Mask for trigger set at 8 */
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#define UART_FCR_TRIGGER_14 0xC0 /* Mask for trigger set at 14 */
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/* 16650 definitions */
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#define UART_FCR6_R_TRIGGER_8 0x00 /* Mask for receive trigger set at 1 */
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#define UART_FCR6_R_TRIGGER_16 0x40 /* Mask for receive trigger set at 4 */
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#define UART_FCR6_R_TRIGGER_24 0x80 /* Mask for receive trigger set at 8 */
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#define UART_FCR6_R_TRIGGER_28 0xC0 /* Mask for receive trigger set at 14 */
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#define UART_FCR6_T_TRIGGER_16 0x00 /* Mask for transmit trigger set at 16 */
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#define UART_FCR6_T_TRIGGER_8 0x10 /* Mask for transmit trigger set at 8 */
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#define UART_FCR6_T_TRIGGER_24 0x20 /* Mask for transmit trigger set at 24 */
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#define UART_FCR6_T_TRIGGER_30 0x30 /* Mask for transmit trigger set at 30 */
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#define UART_FCR7_64BYTE 0x20 /* Go into 64 byte mode (TI16C750) */
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#define UART_LCR 3 /* Out: Line Control Register */
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/*
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* Note: if the word length is 5 bits (UART_LCR_WLEN5), then setting
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* UART_LCR_STOP will select 1.5 stop bits, not 2 stop bits.
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*/
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#define UART_LCR_DLAB 0x80 /* Divisor latch access bit */
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#define UART_LCR_SBC 0x40 /* Set break control */
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#define UART_LCR_SPAR 0x20 /* Stick parity (?) */
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#define UART_LCR_EPAR 0x10 /* Even parity select */
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#define UART_LCR_PARITY 0x08 /* Parity Enable */
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#define UART_LCR_STOP 0x04 /* Stop bits: 0=1 bit, 1=2 bits */
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#define UART_LCR_WLEN5 0x00 /* Wordlength: 5 bits */
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#define UART_LCR_WLEN6 0x01 /* Wordlength: 6 bits */
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#define UART_LCR_WLEN7 0x02 /* Wordlength: 7 bits */
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#define UART_LCR_WLEN8 0x03 /* Wordlength: 8 bits */
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#define UART_MCR 4 /* Out: Modem Control Register */
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#define UART_MCR_CLKSEL 0x80 /* Divide clock by 4 (TI16C752, EFR[4]=1) */
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#define UART_MCR_TCRTLR 0x40 /* Access TCR/TLR (TI16C752, EFR[4]=1) */
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#define UART_MCR_XONANY 0x20 /* Enable Xon Any (TI16C752, EFR[4]=1) */
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#define UART_MCR_AFE 0x20 /* Enable auto-RTS/CTS (TI16C550C/TI16C750) */
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#define UART_MCR_LOOP 0x10 /* Enable loopback test mode */
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#define UART_MCR_OUT2 0x08 /* Out2 complement */
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#define UART_MCR_OUT1 0x04 /* Out1 complement */
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#define UART_MCR_RTS 0x02 /* RTS complement */
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#define UART_MCR_DTR 0x01 /* DTR complement */
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#define UART_LSR 5 /* In: Line Status Register */
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#define UART_LSR_TEMT 0x40 /* Transmitter empty */
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#define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */
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#define UART_LSR_BI 0x10 /* Break interrupt indicator */
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#define UART_LSR_FE 0x08 /* Frame error indicator */
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#define UART_LSR_PE 0x04 /* Parity error indicator */
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#define UART_LSR_OE 0x02 /* Overrun error indicator */
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#define UART_LSR_DR 0x01 /* Receiver data ready */
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#define UART_LSR_BRK_ERROR_BITS 0x1E /* BI, FE, PE, OE bits */
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#define UART_MSR 6 /* In: Modem Status Register */
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#define UART_MSR_DCD 0x80 /* Data Carrier Detect */
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#define UART_MSR_RI 0x40 /* Ring Indicator */
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#define UART_MSR_DSR 0x20 /* Data Set Ready */
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#define UART_MSR_CTS 0x10 /* Clear to Send */
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#define UART_MSR_DDCD 0x08 /* Delta DCD */
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#define UART_MSR_TERI 0x04 /* Trailing edge ring indicator */
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#define UART_MSR_DDSR 0x02 /* Delta DSR */
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#define UART_MSR_DCTS 0x01 /* Delta CTS */
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#define UART_MSR_ANY_DELTA 0x0F /* Any of the delta bits! */
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#define UART_SCR 7 /* I/O: Scratch Register */
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/*
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* DLAB=1
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*/
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#define UART_DLL 0 /* Out: Divisor Latch Low */
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#define UART_DLM 1 /* Out: Divisor Latch High */
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/*
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* LCR=0xBF (or DLAB=1 for 16C660)
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*/
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#define UART_EFR 2 /* I/O: Extended Features Register */
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#define UART_EFR_CTS 0x80 /* CTS flow control */
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#define UART_EFR_RTS 0x40 /* RTS flow control */
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#define UART_EFR_SCD 0x20 /* Special character detect */
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#define UART_EFR_ECB 0x10 /* Enhanced control bit */
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/*
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* the low four bits control software flow control
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*/
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/*
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* LCR=0xBF, TI16C752, ST16650, ST16650A, ST16654
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*/
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#define UART_XON1 4 /* I/O: Xon character 1 */
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#define UART_XON2 5 /* I/O: Xon character 2 */
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#define UART_XOFF1 6 /* I/O: Xoff character 1 */
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#define UART_XOFF2 7 /* I/O: Xoff character 2 */
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/*
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* EFR[4]=1 MCR[6]=1, TI16C752
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*/
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#define UART_TI752_TCR 6 /* I/O: transmission control register */
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#define UART_TI752_TLR 7 /* I/O: trigger level register */
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/*
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* LCR=0xBF, XR16C85x
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*/
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#define UART_TRG 0 /* FCTR bit 7 selects Rx or Tx
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* In: Fifo count
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* Out: Fifo custom trigger levels */
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/*
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* These are the definitions for the Programmable Trigger Register
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*/
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#define UART_TRG_1 0x01
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#define UART_TRG_4 0x04
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#define UART_TRG_8 0x08
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#define UART_TRG_16 0x10
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#define UART_TRG_32 0x20
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#define UART_TRG_64 0x40
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#define UART_TRG_96 0x60
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#define UART_TRG_120 0x78
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#define UART_TRG_128 0x80
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#define UART_FCTR 1 /* Feature Control Register */
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#define UART_FCTR_RTS_NODELAY 0x00 /* RTS flow control delay */
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#define UART_FCTR_RTS_4DELAY 0x01
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#define UART_FCTR_RTS_6DELAY 0x02
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#define UART_FCTR_RTS_8DELAY 0x03
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#define UART_FCTR_IRDA 0x04 /* IrDa data encode select */
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#define UART_FCTR_TX_INT 0x08 /* Tx interrupt type select */
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#define UART_FCTR_TRGA 0x00 /* Tx/Rx 550 trigger table select */
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#define UART_FCTR_TRGB 0x10 /* Tx/Rx 650 trigger table select */
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#define UART_FCTR_TRGC 0x20 /* Tx/Rx 654 trigger table select */
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#define UART_FCTR_TRGD 0x30 /* Tx/Rx 850 programmable trigger select */
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#define UART_FCTR_SCR_SWAP 0x40 /* Scratch pad register swap */
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#define UART_FCTR_RX 0x00 /* Programmable trigger mode select */
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#define UART_FCTR_TX 0x80 /* Programmable trigger mode select */
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/*
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* LCR=0xBF, FCTR[6]=1
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*/
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#define UART_EMSR 7 /* Extended Mode Select Register */
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#define UART_EMSR_FIFO_COUNT 0x01 /* Rx/Tx select */
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#define UART_EMSR_ALT_COUNT 0x02 /* Alternating count select */
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/*
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* The Intel XScale on-chip UARTs define these bits
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*/
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#define UART_IER_DMAE 0x80 /* DMA Requests Enable */
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#define UART_IER_UUE 0x40 /* UART Unit Enable */
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#define UART_IER_NRZE 0x20 /* NRZ coding Enable */
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#define UART_IER_RTOIE 0x10 /* Receiver Time Out Interrupt Enable */
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#define UART_IIR_TOD 0x08 /* Character Timeout Indication Detected */
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#define UART_FCR_PXAR1 0x00 /* receive FIFO treshold = 1 */
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#define UART_FCR_PXAR8 0x40 /* receive FIFO treshold = 8 */
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#define UART_FCR_PXAR16 0x80 /* receive FIFO treshold = 16 */
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#define UART_FCR_PXAR32 0xc0 /* receive FIFO treshold = 32 */
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/*
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* These register definitions are for the 16C950
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*/
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#define UART_ASR 0x01 /* Additional Status Register */
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#define UART_RFL 0x03 /* Receiver FIFO level */
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#define UART_TFL 0x04 /* Transmitter FIFO level */
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#define UART_ICR 0x05 /* Index Control Register */
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/* The 16950 ICR registers */
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#define UART_ACR 0x00 /* Additional Control Register */
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#define UART_CPR 0x01 /* Clock Prescalar Register */
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#define UART_TCR 0x02 /* Times Clock Register */
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#define UART_CKS 0x03 /* Clock Select Register */
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#define UART_TTL 0x04 /* Transmitter Interrupt Trigger Level */
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#define UART_RTL 0x05 /* Receiver Interrupt Trigger Level */
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#define UART_FCL 0x06 /* Flow Control Level Lower */
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#define UART_FCH 0x07 /* Flow Control Level Higher */
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#define UART_ID1 0x08 /* ID #1 */
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#define UART_ID2 0x09 /* ID #2 */
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#define UART_ID3 0x0A /* ID #3 */
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#define UART_REV 0x0B /* Revision */
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#define UART_CSR 0x0C /* Channel Software Reset */
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#define UART_NMR 0x0D /* Nine-bit Mode Register */
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#define UART_CTR 0xFF
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/*
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* The 16C950 Additional Control Register
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*/
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#define UART_ACR_RXDIS 0x01 /* Receiver disable */
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#define UART_ACR_TXDIS 0x02 /* Transmitter disable */
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#define UART_ACR_DSRFC 0x04 /* DSR Flow Control */
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#define UART_ACR_TLENB 0x20 /* 950 trigger levels enable */
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#define UART_ACR_ICRRD 0x40 /* ICR Read enable */
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#define UART_ACR_ASREN 0x80 /* Additional status enable */
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/*
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* These definitions are for the RSA-DV II/S card, from
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*
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* Kiyokazu SUTO <suto@ks-and-ks.ne.jp>
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*/
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#define UART_RSA_BASE (-8)
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#define UART_RSA_MSR ((UART_RSA_BASE) + 0) /* I/O: Mode Select Register */
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#define UART_RSA_MSR_SWAP (1 << 0) /* Swap low/high 8 bytes in I/O port addr */
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#define UART_RSA_MSR_FIFO (1 << 2) /* Enable the external FIFO */
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#define UART_RSA_MSR_FLOW (1 << 3) /* Enable the auto RTS/CTS flow control */
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#define UART_RSA_MSR_ITYP (1 << 4) /* Level (1) / Edge triger (0) */
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#define UART_RSA_IER ((UART_RSA_BASE) + 1) /* I/O: Interrupt Enable Register */
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#define UART_RSA_IER_Rx_FIFO_H (1 << 0) /* Enable Rx FIFO half full int. */
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#define UART_RSA_IER_Tx_FIFO_H (1 << 1) /* Enable Tx FIFO half full int. */
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#define UART_RSA_IER_Tx_FIFO_E (1 << 2) /* Enable Tx FIFO empty int. */
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#define UART_RSA_IER_Rx_TOUT (1 << 3) /* Enable char receive timeout int */
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#define UART_RSA_IER_TIMER (1 << 4) /* Enable timer interrupt */
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#define UART_RSA_SRR ((UART_RSA_BASE) + 2) /* IN: Status Read Register */
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#define UART_RSA_SRR_Tx_FIFO_NEMP (1 << 0) /* Tx FIFO is not empty (1) */
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#define UART_RSA_SRR_Tx_FIFO_NHFL (1 << 1) /* Tx FIFO is not half full (1) */
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#define UART_RSA_SRR_Tx_FIFO_NFUL (1 << 2) /* Tx FIFO is not full (1) */
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#define UART_RSA_SRR_Rx_FIFO_NEMP (1 << 3) /* Rx FIFO is not empty (1) */
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#define UART_RSA_SRR_Rx_FIFO_NHFL (1 << 4) /* Rx FIFO is not half full (1) */
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#define UART_RSA_SRR_Rx_FIFO_NFUL (1 << 5) /* Rx FIFO is not full (1) */
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#define UART_RSA_SRR_Rx_TOUT (1 << 6) /* Character reception timeout occurred (1) */
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#define UART_RSA_SRR_TIMER (1 << 7) /* Timer interrupt occurred */
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#define UART_RSA_FRR ((UART_RSA_BASE) + 2) /* OUT: FIFO Reset Register */
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#define UART_RSA_TIVSR ((UART_RSA_BASE) + 3) /* I/O: Timer Interval Value Set Register */
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#define UART_RSA_TCR ((UART_RSA_BASE) + 4) /* OUT: Timer Control Register */
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#define UART_RSA_TCR_SWITCH (1 << 0) /* Timer on */
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/*
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* The RSA DSV/II board has two fixed clock frequencies. One is the
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* standard rate, and the other is 8 times faster.
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*/
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#define SERIAL_RSA_BAUD_BASE (921600)
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#define SERIAL_RSA_BAUD_BASE_LO (SERIAL_RSA_BAUD_BASE / 8)
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/*
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* Extra serial register definitions for the internal UARTs
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* in TI OMAP processors.
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*/
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#define UART_OMAP_MDR1 0x08 /* Mode definition register */
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#define UART_OMAP_MDR2 0x09 /* Mode definition register 2 */
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#define UART_OMAP_SCR 0x10 /* Supplementary control register */
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#define UART_OMAP_SSR 0x11 /* Supplementary status register */
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#define UART_OMAP_EBLR 0x12 /* BOF length register */
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#define UART_OMAP_OSC_12M_SEL 0x13 /* OMAP1510 12MHz osc select */
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#define UART_OMAP_MVER 0x14 /* Module version register */
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#define UART_OMAP_SYSC 0x15 /* System configuration register */
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#define UART_OMAP_SYSS 0x16 /* System status register */
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#endif /* _LINUX_SERIAL_REG_H */
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