Merge tag 'tty-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty and serial driver updates from Greg KH:
 "Here is the big set of tty and serial driver updates for 5.13-rc1.

  Actually busy this release, with a number of cleanups happening:

   - much needed core tty cleanups by Jiri Slaby

   - removal of unused and orphaned old-style serial drivers. If anyone
     shows up with this hardware, it is trivial to restore these but we
     really do not think they are in use anymore.

   - fixes and cleanups from Johan Hovold on a number of termios setting
     corner cases that loads of drivers got wrong as well as removing
     unneeded code due to tty core changes from long ago that were never
     propagated out to the drivers

   - loads of platform-specific serial port driver updates and fixes

   - coding style cleanups and other small fixes and updates all over
     the tty/serial tree.

  All of these have been in linux-next for a while now with no reported
  issues"

* tag 'tty-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (186 commits)
  serial: extend compile-test coverage
  serial: stm32: add FIFO threshold configuration
  dt-bindings: serial: 8250: update TX FIFO trigger level
  dt-bindings: serial: stm32: override FIFO threshold properties
  dt-bindings: serial: add RX and TX FIFO properties
  serial: xilinx_uartps: drop low-latency workaround
  serial: vt8500: drop low-latency workaround
  serial: timbuart: drop low-latency workaround
  serial: sunsu: drop low-latency workaround
  serial: sifive: drop low-latency workaround
  serial: txx9: drop low-latency workaround
  serial: sa1100: drop low-latency workaround
  serial: rp2: drop low-latency workaround
  serial: rda: drop low-latency workaround
  serial: owl: drop low-latency workaround
  serial: msm_serial: drop low-latency workaround
  serial: mpc52xx_uart: drop low-latency workaround
  serial: meson: drop low-latency workaround
  serial: mcf: drop low-latency workaround
  serial: lpc32xx_hs: drop low-latency workaround
  ...

8 files changed, 24 insertions, 590 deletions

diff --git a/include/linux/cyclades.h b/include/linux/cyclades.h
deleted file mode 100644
index 05ee0f19448a..000000000000
--- a/include/linux/cyclades.h
+++ /dev/null
@@ -1,364 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* $Revision: 3.0 $$Date: 1998/11/02 14:20:59 $
- * linux/include/linux/cyclades.h
- *
- * This file was initially written by
- * Randolph Bentson <bentson@grieg.seaslug.org> and is maintained by
- * Ivan Passos <ivan@cyclades.com>.
- *
- * This file contains the general definitions for the cyclades.c driver
- *$Log: cyclades.h,v $
- *Revision 3.1  2002/01/29 11:36:16  henrique
- *added throttle field on struct cyclades_port to indicate whether the
- *port is throttled or not
- *
- *Revision 3.1  2000/04/19 18:52:52  ivan
- *converted address fields to unsigned long and added fields for physical
- *addresses on cyclades_card structure;
- *
- *Revision 3.0  1998/11/02 14:20:59  ivan
- *added nports field on cyclades_card structure;
- *
- *Revision 2.5  1998/08/03 16:57:01  ivan
- *added cyclades_idle_stats structure;
- * 
- *Revision 2.4  1998/06/01 12:09:53  ivan
- *removed closing_wait2 from cyclades_port structure;
- *
- *Revision 2.3  1998/03/16 18:01:12  ivan
- *changes in the cyclades_port structure to get it closer to the 
- *standard serial port structure;
- *added constants for new ioctls;
- *
- *Revision 2.2  1998/02/17 16:50:00  ivan
- *changes in the cyclades_port structure (addition of shutdown_wait and 
- *chip_rev variables);
- *added constants for new ioctls and for CD1400 rev. numbers.
- *
- *Revision 2.1	1997/10/24 16:03:00  ivan
- *added rflow (which allows enabling the CD1400 special flow control 
- *feature) and rtsdtr_inv (which allows DTR/RTS pin inversion) to 
- *cyclades_port structure;
- *added Alpha support
- *
- *Revision 2.0  1997/06/30 10:30:00  ivan
- *added some new doorbell command constants related to IOCTLW and
- *UART error signaling
- *
- *Revision 1.8  1997/06/03 15:30:00  ivan
- *added constant ZFIRM_HLT
- *added constant CyPCI_Ze_win ( = 2 * Cy_PCI_Zwin)
- *
- *Revision 1.7  1997/03/26 10:30:00  daniel
- *new entries at the end of cyclades_port struct to reallocate
- *variables illegally allocated within card memory.
- *
- *Revision 1.6  1996/09/09 18:35:30  bentson
- *fold in changes for Cyclom-Z -- including structures for
- *communicating with board as well modest changes to original
- *structures to support new features.
- *
- *Revision 1.5  1995/11/13 21:13:31  bentson
- *changes suggested by Michael Chastain <mec@duracef.shout.net>
- *to support use of this file in non-kernel applications
- *
- *
- */
-#ifndef _LINUX_CYCLADES_H
-#define _LINUX_CYCLADES_H
-
-#include <uapi/linux/cyclades.h>
-
-
-/* Per card data structure */
-struct cyclades_card {
-	void __iomem *base_addr;
-	union {
-		void __iomem *p9050;
-		struct RUNTIME_9060 __iomem *p9060;
-	} ctl_addr;
-	struct BOARD_CTRL __iomem *board_ctrl;	/* cyz specific */
-	int irq;
-	unsigned int num_chips;	/* 0 if card absent, -1 if Z/PCI, else Y */
-	unsigned int first_line;	/* minor number of first channel on card */
-	unsigned int nports;	/* Number of ports in the card */
-	int bus_index;		/* address shift - 0 for ISA, 1 for PCI */
-	int intr_enabled;		/* FW Interrupt flag - 0 disabled, 1 enabled */
-	u32 hw_ver;
-	spinlock_t card_lock;
-	struct cyclades_port *ports;
-};
-
-/***************************************
- * Memory access functions/macros      *
- * (required to support Alpha systems) *
- ***************************************/
-
-#define cy_writeb(port,val)     do { writeb((val), (port)); mb(); } while (0)
-#define cy_writew(port,val)     do { writew((val), (port)); mb(); } while (0)
-#define cy_writel(port,val)     do { writel((val), (port)); mb(); } while (0)
-
-/*
- * Statistics counters
- */
-struct cyclades_icount {
-	__u32	cts, dsr, rng, dcd, tx, rx;
-	__u32	frame, parity, overrun, brk;
-	__u32	buf_overrun;
-};
-
-/*
- * This is our internal structure for each serial port's state.
- * 
- * Many fields are paralleled by the structure used by the serial_struct
- * structure.
- *
- * For definitions of the flags field, see tty.h
- */
-
-struct cyclades_port {
-	int                     magic;
-	struct tty_port		port;
-	struct cyclades_card	*card;
-	union {
-		struct {
-			void __iomem *base_addr;
-		} cyy;
-		struct {
-			struct CH_CTRL __iomem	*ch_ctrl;
-			struct BUF_CTRL __iomem	*buf_ctrl;
-		} cyz;
-	} u;
-	int			line;
-	int			flags; 		/* defined in tty.h */
-	int                     type;		/* UART type */
-	int			read_status_mask;
-	int			ignore_status_mask;
-	int			timeout;
-	int			xmit_fifo_size;
-	int                     cor1,cor2,cor3,cor4,cor5;
-	int                     tbpr,tco,rbpr,rco;
-	int			baud;
-	int			rflow;
-	int			rtsdtr_inv;
-	int			chip_rev;
-	int			custom_divisor;
-	u8			x_char; /* to be pushed out ASAP */
-	int                     breakon;
-	int                     breakoff;
-	int			xmit_head;
-	int			xmit_tail;
-	int			xmit_cnt;
-        int                     default_threshold;
-        int                     default_timeout;
-	unsigned long		rflush_count;
-	struct cyclades_monitor	mon;
-	struct cyclades_idle_stats	idle_stats;
-	struct cyclades_icount	icount;
-	struct completion       shutdown_wait;
-	int throttle;
-#ifdef CONFIG_CYZ_INTR
-	struct timer_list	rx_full_timer;
-#endif
-};
-
-#define	CLOSING_WAIT_DELAY	30*HZ
-#define CY_CLOSING_WAIT_NONE	ASYNC_CLOSING_WAIT_NONE
-#define CY_CLOSING_WAIT_INF	ASYNC_CLOSING_WAIT_INF
-
-
-#define CyMAX_CHIPS_PER_CARD	8
-#define CyMAX_CHAR_FIFO		12
-#define CyPORTS_PER_CHIP	4
-#define	CD1400_MAX_SPEED	115200
-
-#define	CyISA_Ywin	0x2000
-
-#define CyPCI_Ywin 	0x4000
-#define CyPCI_Yctl 	0x80
-#define CyPCI_Zctl 	CTRL_WINDOW_SIZE
-#define CyPCI_Zwin 	0x80000
-#define CyPCI_Ze_win 	(2 * CyPCI_Zwin)
-
-#define PCI_DEVICE_ID_MASK	0x06
-
-/**** CD1400 registers ****/
-
-#define CD1400_REV_G	0x46
-#define CD1400_REV_J	0x48
-
-#define CyRegSize  	0x0400
-#define Cy_HwReset 	0x1400
-#define Cy_ClrIntr 	0x1800
-#define Cy_EpldRev 	0x1e00
-
-/* Global Registers */
-
-#define CyGFRCR		(0x40*2)
-#define      CyRevE		(44)
-#define CyCAR		(0x68*2)
-#define      CyCHAN_0		(0x00)
-#define      CyCHAN_1		(0x01)
-#define      CyCHAN_2		(0x02)
-#define      CyCHAN_3		(0x03)
-#define CyGCR		(0x4B*2)
-#define      CyCH0_SERIAL	(0x00)
-#define      CyCH0_PARALLEL	(0x80)
-#define CySVRR		(0x67*2)
-#define      CySRModem		(0x04)
-#define      CySRTransmit	(0x02)
-#define      CySRReceive	(0x01)
-#define CyRICR		(0x44*2)
-#define CyTICR		(0x45*2)
-#define CyMICR		(0x46*2)
-#define      CyICR0		(0x00)
-#define      CyICR1		(0x01)
-#define      CyICR2		(0x02)
-#define      CyICR3		(0x03)
-#define CyRIR		(0x6B*2)
-#define CyTIR		(0x6A*2)
-#define CyMIR		(0x69*2)
-#define      CyIRDirEq		(0x80)
-#define      CyIRBusy		(0x40)
-#define      CyIRUnfair		(0x20)
-#define      CyIRContext	(0x1C)
-#define      CyIRChannel	(0x03)
-#define CyPPR 		(0x7E*2)
-#define      CyCLOCK_20_1MS	(0x27)
-#define      CyCLOCK_25_1MS	(0x31)
-#define      CyCLOCK_25_5MS	(0xf4)
-#define      CyCLOCK_60_1MS	(0x75)
-#define      CyCLOCK_60_2MS	(0xea)
-
-/* Virtual Registers */
-
-#define CyRIVR		(0x43*2)
-#define CyTIVR		(0x42*2)
-#define CyMIVR		(0x41*2)
-#define      CyIVRMask (0x07)
-#define      CyIVRRxEx (0x07)
-#define      CyIVRRxOK (0x03)
-#define      CyIVRTxOK (0x02)
-#define      CyIVRMdmOK (0x01)
-#define CyTDR		(0x63*2)
-#define CyRDSR		(0x62*2)
-#define      CyTIMEOUT		(0x80)
-#define      CySPECHAR		(0x70)
-#define      CyBREAK		(0x08)
-#define      CyPARITY		(0x04)
-#define      CyFRAME		(0x02)
-#define      CyOVERRUN		(0x01)
-#define CyMISR		(0x4C*2)
-/* see CyMCOR_ and CyMSVR_ for bits*/
-#define CyEOSRR		(0x60*2)
-
-/* Channel Registers */
-
-#define CyLIVR		(0x18*2)
-#define      CyMscsr		(0x01)
-#define      CyTdsr		(0x02)
-#define      CyRgdsr		(0x03)
-#define      CyRedsr		(0x07)
-#define CyCCR		(0x05*2)
-/* Format 1 */
-#define      CyCHAN_RESET	(0x80)
-#define      CyCHIP_RESET	(0x81)
-#define      CyFlushTransFIFO	(0x82)
-/* Format 2 */
-#define      CyCOR_CHANGE	(0x40)
-#define      CyCOR1ch		(0x02)
-#define      CyCOR2ch		(0x04)
-#define      CyCOR3ch		(0x08)
-/* Format 3 */
-#define      CySEND_SPEC_1	(0x21)
-#define      CySEND_SPEC_2	(0x22)
-#define      CySEND_SPEC_3	(0x23)
-#define      CySEND_SPEC_4	(0x24)
-/* Format 4 */
-#define      CyCHAN_CTL		(0x10)
-#define      CyDIS_RCVR		(0x01)
-#define      CyENB_RCVR		(0x02)
-#define      CyDIS_XMTR		(0x04)
-#define      CyENB_XMTR		(0x08)
-#define CySRER		(0x06*2)
-#define      CyMdmCh		(0x80)
-#define      CyRxData		(0x10)
-#define      CyTxRdy		(0x04)
-#define      CyTxMpty		(0x02)
-#define      CyNNDT		(0x01)
-#define CyCOR1		(0x08*2)
-#define      CyPARITY_NONE	(0x00)
-#define      CyPARITY_0		(0x20)
-#define      CyPARITY_1		(0xA0)
-#define      CyPARITY_E		(0x40)
-#define      CyPARITY_O		(0xC0)
-#define      Cy_1_STOP		(0x00)
-#define      Cy_1_5_STOP	(0x04)
-#define      Cy_2_STOP		(0x08)
-#define      Cy_5_BITS		(0x00)
-#define      Cy_6_BITS		(0x01)
-#define      Cy_7_BITS		(0x02)
-#define      Cy_8_BITS		(0x03)
-#define CyCOR2		(0x09*2)
-#define      CyIXM		(0x80)
-#define      CyTxIBE		(0x40)
-#define      CyETC		(0x20)
-#define      CyAUTO_TXFL	(0x60)
-#define      CyLLM		(0x10)
-#define      CyRLM		(0x08)
-#define      CyRtsAO		(0x04)
-#define      CyCtsAE		(0x02)
-#define      CyDsrAE		(0x01)
-#define CyCOR3		(0x0A*2)
-#define      CySPL_CH_DRANGE	(0x80)  /* special character detect range */
-#define      CySPL_CH_DET1	(0x40)  /* enable special character detection
-                                                               on SCHR4-SCHR3 */
-#define      CyFL_CTRL_TRNSP	(0x20)  /* Flow Control Transparency */
-#define      CySPL_CH_DET2	(0x10)  /* Enable special character detection
-                                                               on SCHR2-SCHR1 */
-#define      CyREC_FIFO		(0x0F)  /* Receive FIFO threshold */
-#define CyCOR4		(0x1E*2)
-#define CyCOR5		(0x1F*2)
-#define CyCCSR		(0x0B*2)
-#define      CyRxEN		(0x80)
-#define      CyRxFloff		(0x40)
-#define      CyRxFlon		(0x20)
-#define      CyTxEN		(0x08)
-#define      CyTxFloff		(0x04)
-#define      CyTxFlon		(0x02)
-#define CyRDCR		(0x0E*2)
-#define CySCHR1		(0x1A*2)
-#define CySCHR2 	(0x1B*2)
-#define CySCHR3		(0x1C*2)
-#define CySCHR4		(0x1D*2)
-#define CySCRL		(0x22*2)
-#define CySCRH		(0x23*2)
-#define CyLNC		(0x24*2)
-#define CyMCOR1 	(0x15*2)
-#define CyMCOR2		(0x16*2)
-#define CyRTPR		(0x21*2)
-#define CyMSVR1		(0x6C*2)
-#define CyMSVR2		(0x6D*2)
-#define      CyANY_DELTA	(0xF0)
-#define      CyDSR		(0x80)
-#define      CyCTS		(0x40)
-#define      CyRI		(0x20)
-#define      CyDCD		(0x10)
-#define      CyDTR              (0x02)
-#define      CyRTS              (0x01)
-#define CyPVSR		(0x6F*2)
-#define CyRBPR		(0x78*2)
-#define CyRCOR		(0x7C*2)
-#define CyTBPR		(0x72*2)
-#define CyTCOR		(0x76*2)
-
-/* Custom Registers */
-
-#define	CyPLX_VER	(0x3400)
-#define	PLX_9050	0x0b
-#define	PLX_9060	0x0c
-#define	PLX_9080	0x0d
-
-/***************************************************************************/
-
-#endif /* _LINUX_CYCLADES_H */
diff --git a/include/linux/isicom.h b/include/linux/isicom.h
deleted file mode 100644
index 7de6822d7b1a..000000000000
--- a/include/linux/isicom.h
+++ /dev/null
@@ -1,85 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_ISICOM_H
-#define _LINUX_ISICOM_H
-
-#define		YES	1
-#define		NO	0
-
-/*
- *  ISICOM Driver definitions ...
- *
- */
-
-#define		ISICOM_NAME	"ISICom"
-
-/*
- *      PCI definitions
- */
-
-#define		DEVID_COUNT	9
-#define		VENDOR_ID	0x10b5
-
-/*
- *	These are now officially allocated numbers
- */
-
-#define		ISICOM_NMAJOR	112	/* normal  */
-#define		ISICOM_CMAJOR	113	/* callout */
-#define		ISICOM_MAGIC	(('M' << 8) | 'T')
-
-#define		WAKEUP_CHARS	256	/* hard coded for now	*/
-#define		TX_SIZE		254
-
-#define		BOARD_COUNT	4
-#define		PORT_COUNT	(BOARD_COUNT*16)
-
-/*   character sizes  */
-
-#define		ISICOM_CS5		0x0000
-#define		ISICOM_CS6		0x0001
-#define		ISICOM_CS7		0x0002
-#define		ISICOM_CS8		0x0003
-
-/* stop bits */
-
-#define		ISICOM_1SB		0x0000
-#define		ISICOM_2SB		0x0004
-
-/* parity */
-
-#define		ISICOM_NOPAR		0x0000
-#define		ISICOM_ODPAR		0x0008
-#define		ISICOM_EVPAR		0x0018
-
-/* flow control */
-
-#define		ISICOM_CTSRTS		0x03
-#define		ISICOM_INITIATE_XONXOFF	0x04
-#define		ISICOM_RESPOND_XONXOFF	0x08
-
-#define	BOARD(line)  (((line) >> 4) & 0x3)
-
-	/*	isi kill queue bitmap	*/
-
-#define		ISICOM_KILLTX		0x01
-#define		ISICOM_KILLRX		0x02
-
-	/* isi_board status bitmap */
-
-#define		FIRMWARE_LOADED		0x0001
-#define		BOARD_ACTIVE		0x0002
-#define		BOARD_INIT		0x0004
-
- 	/* isi_port status bitmap  */
-
-#define		ISI_CTS			0x1000
-#define		ISI_DSR			0x2000
-#define		ISI_RI			0x4000
-#define		ISI_DCD			0x8000
-#define		ISI_DTR			0x0100
-#define		ISI_RTS			0x0200
-
-
-#define		ISI_TXOK		0x0001
-
-#endif	/*	ISICOM_H	*/
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index a76ccb697bef..4c3fa5293d76 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -1688,37 +1688,8 @@
 #define PCI_VENDOR_ID_MICROSEMI		0x11f8
 
 #define PCI_VENDOR_ID_RP		0x11fe
-#define PCI_DEVICE_ID_RP32INTF		0x0001
-#define PCI_DEVICE_ID_RP8INTF		0x0002
-#define PCI_DEVICE_ID_RP16INTF		0x0003
-#define PCI_DEVICE_ID_RP4QUAD		0x0004
-#define PCI_DEVICE_ID_RP8OCTA		0x0005
-#define PCI_DEVICE_ID_RP8J		0x0006
-#define PCI_DEVICE_ID_RP4J		0x0007
-#define PCI_DEVICE_ID_RP8SNI		0x0008
-#define PCI_DEVICE_ID_RP16SNI		0x0009
-#define PCI_DEVICE_ID_RPP4		0x000A
-#define PCI_DEVICE_ID_RPP8		0x000B
-#define PCI_DEVICE_ID_RP4M		0x000D
-#define PCI_DEVICE_ID_RP2_232		0x000E
-#define PCI_DEVICE_ID_RP2_422		0x000F
-#define PCI_DEVICE_ID_URP32INTF		0x0801
-#define PCI_DEVICE_ID_URP8INTF		0x0802
-#define PCI_DEVICE_ID_URP16INTF		0x0803
-#define PCI_DEVICE_ID_URP8OCTA		0x0805
-#define PCI_DEVICE_ID_UPCI_RM3_8PORT	0x080C
-#define PCI_DEVICE_ID_UPCI_RM3_4PORT	0x080D
-#define PCI_DEVICE_ID_CRP16INTF		0x0903
 
 #define PCI_VENDOR_ID_CYCLADES		0x120e
-#define PCI_DEVICE_ID_CYCLOM_Y_Lo	0x0100
-#define PCI_DEVICE_ID_CYCLOM_Y_Hi	0x0101
-#define PCI_DEVICE_ID_CYCLOM_4Y_Lo	0x0102
-#define PCI_DEVICE_ID_CYCLOM_4Y_Hi	0x0103
-#define PCI_DEVICE_ID_CYCLOM_8Y_Lo	0x0104
-#define PCI_DEVICE_ID_CYCLOM_8Y_Hi	0x0105
-#define PCI_DEVICE_ID_CYCLOM_Z_Lo	0x0200
-#define PCI_DEVICE_ID_CYCLOM_Z_Hi	0x0201
 #define PCI_DEVICE_ID_PC300_RX_2	0x0300
 #define PCI_DEVICE_ID_PC300_RX_1	0x0301
 #define PCI_DEVICE_ID_PC300_TE_2	0x0310
@@ -2065,8 +2036,6 @@
 #define PCI_DEVICE_ID_EXAR_XR17V358	0x0358
 
 #define PCI_VENDOR_ID_MICROGATE		0x13c0
-#define PCI_DEVICE_ID_MICROGATE_USC	0x0010
-#define PCI_DEVICE_ID_MICROGATE_SCA	0x0030
 
 #define PCI_VENDOR_ID_3WARE		0x13C1
 #define PCI_DEVICE_ID_3WARE_1000	0x1000
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index e1b684e33841..d7ed00f1594e 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -500,19 +500,19 @@ static inline int uart_prepare_sysrq_char(struct uart_port *port, unsigned int c
 	return 0;
 }
 
-static inline void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
+static inline void uart_unlock_and_check_sysrq(struct uart_port *port)
 {
 	int sysrq_ch;
 
 	if (!port->has_sysrq) {
-		spin_unlock_irqrestore(&port->lock, irqflags);
+		spin_unlock(&port->lock);
 		return;
 	}
 
 	sysrq_ch = port->sysrq_ch;
 	port->sysrq_ch = 0;
 
-	spin_unlock_irqrestore(&port->lock, irqflags);
+	spin_unlock(&port->lock);
 
 	if (sysrq_ch)
 		handle_sysrq(sysrq_ch);
@@ -526,9 +526,9 @@ static inline int uart_prepare_sysrq_char(struct uart_port *port, unsigned int c
 {
 	return 0;
 }
-static inline void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
+static inline void uart_unlock_and_check_sysrq(struct uart_port *port)
 {
-	spin_unlock_irqrestore(&port->lock, irqflags);
+	spin_unlock(&port->lock);
 }
 #endif	/* CONFIG_MAGIC_SYSRQ_SERIAL */
 
diff --git a/include/linux/serial_s3c.h b/include/linux/serial_s3c.h
index ca2c5393dc6b..f6c3323fc4c5 100644
--- a/include/linux/serial_s3c.h
+++ b/include/linux/serial_s3c.h
@@ -246,6 +246,22 @@
 				 S5PV210_UFCON_TXTRIG4 |	\
 				 S5PV210_UFCON_RXTRIG4)
 
+#define APPLE_S5L_UCON_RXTO_ENA		9
+#define APPLE_S5L_UCON_RXTHRESH_ENA	12
+#define APPLE_S5L_UCON_TXTHRESH_ENA	13
+#define APPLE_S5L_UCON_RXTO_ENA_MSK	(1 << APPLE_S5L_UCON_RXTO_ENA)
+#define APPLE_S5L_UCON_RXTHRESH_ENA_MSK	(1 << APPLE_S5L_UCON_RXTHRESH_ENA)
+#define APPLE_S5L_UCON_TXTHRESH_ENA_MSK	(1 << APPLE_S5L_UCON_TXTHRESH_ENA)
+
+#define APPLE_S5L_UCON_DEFAULT		(S3C2410_UCON_TXIRQMODE | \
+					 S3C2410_UCON_RXIRQMODE | \
+					 S3C2410_UCON_RXFIFO_TOI)
+
+#define APPLE_S5L_UTRSTAT_RXTHRESH	(1<<4)
+#define APPLE_S5L_UTRSTAT_TXTHRESH	(1<<5)
+#define APPLE_S5L_UTRSTAT_RXTO		(1<<9)
+#define APPLE_S5L_UTRSTAT_ALL_FLAGS	(0x3f0)
+
 #ifndef __ASSEMBLY__
 
 #include <linux/serial_core.h>
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 95fc2f100f12..e5d6b1f28823 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -17,30 +17,6 @@
 
 
 /*
- * Lock subclasses for tty locks
- *
- * TTY_LOCK_NORMAL is for normal ttys and master ptys.
- * TTY_LOCK_SLAVE is for slave ptys only.
- *
- * Lock subclasses are necessary for handling nested locking with pty pairs.
- * tty locks which use nested locking:
- *
- * legacy_mutex - Nested tty locks are necessary for releasing pty pairs.
- *		  The stable lock order is master pty first, then slave pty.
- * termios_rwsem - The stable lock order is tty_buffer lock->termios_rwsem.
- *		   Subclassing this lock enables the slave pty to hold its
- *		   termios_rwsem when claiming the master tty_buffer lock.
- * tty_buffer lock - slave ptys can claim nested buffer lock when handling
- *		     signal chars. The stable lock order is slave pty, then
- *		     master.
- */
-
-enum {
-	TTY_LOCK_NORMAL = 0,
-	TTY_LOCK_SLAVE,
-};
-
-/*
  * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
  * hardcoded at present.)
  */
@@ -284,7 +260,7 @@ struct tty_operations;
 struct tty_struct {
 	int	magic;
 	struct kref kref;
-	struct device *dev;
+	struct device *dev;	/* class device or NULL (e.g. ptys, serdev) */
 	struct tty_driver *driver;
 	const struct tty_operations *ops;
 	int index;
@@ -373,21 +349,6 @@ struct tty_file_private {
 #define TTY_LDISC_CHANGING	20	/* Change pending - non-block IO */
 #define TTY_LDISC_HALTED	22	/* Line discipline is halted */
 
-/* Values for tty->flow_change */
-#define TTY_THROTTLE_SAFE 1
-#define TTY_UNTHROTTLE_SAFE 2
-
-static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
-{
-	tty->flow_change = val;
-}
-
-static inline void tty_set_flow_change(struct tty_struct *tty, int val)
-{
-	tty->flow_change = val;
-	smp_mb();
-}
-
 static inline bool tty_io_nonblock(struct tty_struct *tty, struct file *file)
 {
 	return file->f_flags & O_NONBLOCK ||
@@ -419,10 +380,6 @@ extern struct tty_struct *tty_kopen_exclusive(dev_t device);
 extern struct tty_struct *tty_kopen_shared(dev_t device);
 extern void tty_kclose(struct tty_struct *tty);
 extern int tty_dev_name_to_number(const char *name, dev_t *number);
-extern int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout);
-extern void tty_ldisc_unlock(struct tty_struct *tty);
-extern ssize_t redirected_tty_write(struct kiocb *, struct iov_iter *);
-extern struct file *tty_release_redirect(struct tty_struct *tty);
 #else
 static inline void tty_kref_put(struct tty_struct *tty)
 { }
@@ -475,14 +432,10 @@ static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
 
 extern const char *tty_driver_name(const struct tty_struct *tty);
 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
-extern int __tty_check_change(struct tty_struct *tty, int sig);
-extern int tty_check_change(struct tty_struct *tty);
-extern void __stop_tty(struct tty_struct *tty);
 extern void stop_tty(struct tty_struct *tty);
-extern void __start_tty(struct tty_struct *tty);
 extern void start_tty(struct tty_struct *tty);
 extern int tty_register_driver(struct tty_driver *driver);
-extern int tty_unregister_driver(struct tty_driver *driver);
+extern void tty_unregister_driver(struct tty_driver *driver);
 extern struct device *tty_register_device(struct tty_driver *driver,
 					  unsigned index, struct device *dev);
 extern struct device *tty_register_device_attr(struct tty_driver *driver,
@@ -506,23 +459,11 @@ extern int tty_get_icount(struct tty_struct *tty,
 extern int is_current_pgrp_orphaned(void);
 extern void tty_hangup(struct tty_struct *tty);
 extern void tty_vhangup(struct tty_struct *tty);
-extern void tty_vhangup_session(struct tty_struct *tty);
 extern int tty_hung_up_p(struct file *filp);
 extern void do_SAK(struct tty_struct *tty);
 extern void __do_SAK(struct tty_struct *tty);
-extern void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty);
-extern int tty_signal_session_leader(struct tty_struct *tty, int exit_session);
-extern void session_clear_tty(struct pid *session);
 extern void no_tty(void);
-extern void tty_buffer_free_all(struct tty_port *port);
-extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
-extern void tty_buffer_init(struct tty_port *port);
-extern void tty_buffer_set_lock_subclass(struct tty_port *port);
-extern bool tty_buffer_restart_work(struct tty_port *port);
-extern bool tty_buffer_cancel_work(struct tty_port *port);
-extern void tty_buffer_flush_work(struct tty_port *port);
 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
-extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
 						speed_t ibaud, speed_t obaud);
 extern void tty_encode_baud_rate(struct tty_struct *tty,
@@ -550,27 +491,16 @@ extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
 extern void tty_ldisc_deref(struct tty_ldisc *);
 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
-extern void tty_ldisc_hangup(struct tty_struct *tty, bool reset);
-extern int tty_ldisc_reinit(struct tty_struct *tty, int disc);
 extern const struct seq_operations tty_ldiscs_seq_ops;
 
 extern void tty_wakeup(struct tty_struct *tty);
 extern void tty_ldisc_flush(struct tty_struct *tty);
 
-extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
 			unsigned int cmd, unsigned long arg);
-extern long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty,
-			      struct file *file, unsigned int cmd, unsigned long arg);
 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
-extern void tty_default_fops(struct file_operations *fops);
-extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx);
-extern int tty_alloc_file(struct file *file);
-extern void tty_add_file(struct tty_struct *tty, struct file *file);
-extern void tty_free_file(struct file *file);
 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
 extern void tty_release_struct(struct tty_struct *tty, int idx);
-extern int tty_release(struct inode *inode, struct file *filp);
 extern void tty_init_termios(struct tty_struct *tty);
 extern void tty_save_termios(struct tty_struct *tty);
 extern int tty_standard_install(struct tty_driver *driver,
@@ -578,8 +508,6 @@ extern int tty_standard_install(struct tty_driver *driver,
 
 extern struct mutex tty_mutex;
 
-#define tty_is_writelocked(tty)  (mutex_is_locked(&tty->atomic_write_lock))
-
 extern void tty_port_init(struct tty_port *port);
 extern void tty_port_link_device(struct tty_port *port,
 		struct tty_driver *driver, unsigned index);
@@ -699,13 +627,8 @@ static inline int tty_port_users(struct tty_port *port)
 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
 extern int tty_unregister_ldisc(int disc);
 extern int tty_set_ldisc(struct tty_struct *tty, int disc);
-extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
-extern void tty_ldisc_release(struct tty_struct *tty);
-extern int __must_check tty_ldisc_init(struct tty_struct *tty);
-extern void tty_ldisc_deinit(struct tty_struct *tty);
 extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
 				 char *f, int count);
-extern void tty_sysctl_init(void);
 
 /* n_tty.c */
 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
@@ -717,20 +640,10 @@ static inline void n_tty_init(void) { }
 
 /* tty_audit.c */
 #ifdef CONFIG_AUDIT
-extern void tty_audit_add_data(struct tty_struct *tty, const void *data,
-			       size_t size);
 extern void tty_audit_exit(void);
 extern void tty_audit_fork(struct signal_struct *sig);
-extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
 extern int tty_audit_push(void);
 #else
-static inline void tty_audit_add_data(struct tty_struct *tty, const void *data,
-				      size_t size)
-{
-}
-static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
-{
-}
 static inline void tty_audit_exit(void)
 {
 }
@@ -772,16 +685,4 @@ static inline void proc_tty_register_driver(struct tty_driver *d) {}
 static inline void proc_tty_unregister_driver(struct tty_driver *d) {}
 #endif
 
-#define tty_msg(fn, tty, f, ...) \
-	fn("%s %s: " f, tty_driver_name(tty), tty_name(tty), ##__VA_ARGS__)
-
-#define tty_debug(tty, f, ...)	tty_msg(pr_debug, tty, f, ##__VA_ARGS__)
-#define tty_info(tty, f, ...)	tty_msg(pr_info, tty, f, ##__VA_ARGS__)
-#define tty_notice(tty, f, ...)	tty_msg(pr_notice, tty, f, ##__VA_ARGS__)
-#define tty_warn(tty, f, ...)	tty_msg(pr_warn, tty, f, ##__VA_ARGS__)
-#define tty_err(tty, f, ...)	tty_msg(pr_err, tty, f, ##__VA_ARGS__)
-
-#define tty_info_ratelimited(tty, f, ...) \
-		tty_msg(pr_info_ratelimited, tty, f, ##__VA_ARGS__)
-
 #endif
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 61c3372d3f32..2f719b471d52 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -228,7 +228,7 @@
  *
  *	Called when the device receives a TIOCGICOUNT ioctl. Passed a kernel
  *	structure to complete. This method is optional and will only be called
- *	if provided (otherwise EINVAL will be returned).
+ *	if provided (otherwise ENOTTY will be returned).
  */
 
 #include <linux/export.h>
diff --git a/include/linux/tty_ldisc.h b/include/linux/tty_ldisc.h
index 572a07976116..31284b55bd4f 100644
--- a/include/linux/tty_ldisc.h
+++ b/include/linux/tty_ldisc.h
@@ -173,7 +173,6 @@ extern int ldsem_down_write_nested(struct ld_semaphore *sem, int subclass,
 
 
 struct tty_ldisc_ops {
-	int	magic;
 	char	*name;
 	int	num;
 	int	flags;
@@ -218,8 +217,6 @@ struct tty_ldisc {
 	struct tty_struct *tty;
 };
 
-#define TTY_LDISC_MAGIC	0x5403
-
 #define LDISC_FLAG_DEFINED	0x00000001
 
 #define MODULE_ALIAS_LDISC(ldisc) \