/* SPDX-License-Identifier: GPL-2.0 */
/*
* zs.h: Definitions for the DECstation Z85C30 serial driver.
*
* Adapted from drivers/sbus/char/sunserial.h by Paul Mackerras.
* Adapted from drivers/macintosh/macserial.h by Harald Koerfgen.
*
* Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 2004, 2005, 2007 Maciej W. Rozycki
*/
#ifndef _SERIAL_ZS_H
#define _SERIAL_ZS_H
#ifdef __KERNEL__
#define ZS_NUM_REGS 16
/*
* This is our internal structure for each serial port's state.
*/
struct zs_port {
struct zs_scc *scc; /* Containing SCC. */
struct uart_port port; /* Underlying UART. */
int clk_mode; /* May be 1, 16, 32, or 64. */
unsigned int tty_break; /* Set on BREAK condition. */
int tx_stopped; /* Output is suspended. */
unsigned int mctrl; /* State of modem lines. */
u8 brk; /* BREAK state from RR0. */
u8 regs[ZS_NUM_REGS]; /* Channel write registers. */
};
/*
* Per-SCC state for locking and the interrupt handler.
*/
struct zs_scc {
struct zs_port zport[2];
spinlock_t zlock;
atomic_t irq_guard;
int initialised;
};
#endif /* __KERNEL__ */
/*
* Conversion routines to/from brg time constants from/to bits per second.
*/
#define ZS_BRG_TO_BPS(brg, freq) ((freq) / 2 / ((brg) + 2))
#define ZS_BPS_TO_BRG(bps, freq) ((((freq) + (bps)) / (2 * (bps))) - 2)
/*
* The Zilog register set.
*/
/* Write Register 0 (Command) */
#define R0 0 /* Register selects */
#define R1 1
#define R2 2
#define R3 3
#define R4 4
#define R5 5
#define R6 6
#define R7 7
#define R8 8
#define R9 9
#define R10 10
#define R11 11
#define R12 12
#define R13 13
#define R14 14
#define R15 15
#define NULLCODE 0 /* Null Code */
#define POINT_HIGH 0x8 /* Select upper half of registers */
#define RES_EXT_INT 0x10 /* Reset Ext. Status Interrupts */
#define SEND_ABORT 0x18 /* HDLC Abort */
#define RES_RxINT_FC 0x20 /* Reset RxINT on First Character */
#define RES_Tx_P 0x28 /* Reset TxINT Pending */
#define ERR_RES 0x30 /* Error Reset */
#define RES_H_IUS 0x38 /* Reset highest IUS */
#define RES_Rx_CRC 0x40 /* Reset Rx CRC Checker */
#define RES_Tx_CRC 0x80 /* Reset Tx CRC Checker */
#define RES_EOM_L 0xC0 /* Reset EOM latch */
/* Write Register 1 (Tx/Rx/Ext Int Enable and WAIT/DMA Commands) */
#define EXT_INT_ENAB 0x1 /* Ext Int Enable */
#define TxINT_ENAB 0x2 /* Tx Int Enable */
#define PAR_SPEC 0x4 /* Parity is special condition */
#define RxINT_DISAB 0 /* Rx Int Disable */
#define RxINT_FCERR 0x8 /* Rx Int on First Character Only or Error */
#define RxINT_ALL 0x10 /* Int on all Rx Characters or error */
#define RxINT_ERR 0x18 /* Int on error only */
#define RxINT_MASK 0x18
#define WT_RDY_RT 0x20 /* Wait/Ready on R/T */
#define WT_FN_RDYFN 0x40 /* Wait/FN/Ready FN */
#define WT_RDY_ENAB 0x80 /* Wait/Ready Enable */
/* Write Register 2 (Interrupt Vector) */
/* Write Register 3 (Receive Parameters and Control) */
#define RxENABLE 0x1 /* Rx Enable */
#define SYNC_L_INH 0x2 /* Sync Character Load Inhibit */
#define ADD_SM 0x4 /* Address Search Mode (SDLC) */
#define RxCRC_ENAB 0x8 /* Rx CRC Enable */
#define ENT_HM 0x10 /* Enter Hunt Mode */
#define AUTO_ENAB 0x20 /* Auto Enables */
#define Rx5 0x0 /* Rx 5 Bits/Character */
#define Rx7 0x40 /* Rx 7 Bits/Character */
#define Rx6 0x80 /* Rx 6 Bits/Character */
#define Rx8 0xc0 /* Rx 8 Bits/Character */
#define RxNBITS_MASK 0xc0
/* Write Register 4 (Transmit/Receive Miscellaneous Parameters and Modes) */
#define PAR_ENA 0x1 /* Parity Enable */
#define PAR_EVEN 0x2 /* Parity Even/Odd* */
#define SYNC_ENAB 0 /* Sync Modes Enable */
#define SB1 0x4 /* 1 stop bit/char */
#define SB15 0x8 /* 1.5 stop bits/char */
#define SB2 0xc /* 2 stop bits/char */
#define SB_MASK 0xc
#define MONSYNC 0 /* 8 Bit Sync character */
#define BISYNC 0x10 /* 16 bit sync character */
#define SDLC 0x20 /* SDLC Mode (01111110 Sync Flag) */
#define EXTSYNC 0x30 /* External Sync Mode */
#define X1CLK 0x0 /* x1 clock mode */
#define X16CLK 0x40 /* x16 clock mode */
#define X32CLK 0x80 /* x32 clock mode */
#define X64CLK 0xc0 /* x64 clock mode */
#define XCLK_MASK 0xc0
/* Write Register 5 (Transmit Parameters and Controls) */
#define TxCRC_ENAB 0x1 /* Tx CRC Enable */
#define RTS 0x2 /* RTS */
#define SDLC_CRC 0x4 /* SDLC/CRC-16 */
#define TxENAB 0x8 /* Tx Enable */
#define SND_BRK 0x10 /* Send Break */
#define Tx5 0x0 /* Tx 5 bits (or less)/character */
#define Tx7 0x20 /* Tx 7 bits/character */
#define Tx6 0x40 /* Tx 6 bits/character */
#define Tx8 0x60 /* Tx 8 bits/character */
#define TxNBITS_MASK 0x60
#define DTR 0x80 /* DTR */
/* Write Register 6 (Sync bits 0-7/SDLC Address Field) */
/* Write Register 7 (Sync bits 8-15/SDLC 01111110) */
/* Write Register 8 (Transmit Buffer) */
/* Write Register 9 (Master Interrupt Control) */
#define VIS 1 /* Vector Includes Status */
#define NV 2 /* No Vector */
#define DLC 4 /* Disable Lower Chain */
#define MIE 8 /* Master Interrupt Enable */
#define STATHI 0x10 /* Status high */
#define SOFTACK 0x20 /* Software Interrupt Acknowledge */
#define NORESET 0 /* No reset on write to R9 */
#define CHRB 0x40 /* Reset channel B */
#define CHRA 0x80 /* Reset channel A */
#define FHWRES 0xc0 /* Force hardware reset */
/* Write Register 10 (Miscellaneous Transmitter/Receiver Control Bits) */
#define BIT6 1 /* 6 bit/8bit sync */
#define LOOPMODE 2 /* SDLC Loop mode */
#define ABUNDER 4 /* Abort/flag on SDLC xmit underrun */
#define MARKIDLE 8 /* Mark/flag on idle */
#define GAOP 0x10 /* Go active on poll */
#define NRZ 0 /* NRZ mode */
#define NRZI 0x20 /* NRZI mode */
#define FM1 0x40 /* FM1 (transition = 1) */
#define FM0 0x60 /* FM0 (transition = 0) */
#define CRCPS 0x80 /* CRC Preset I/O */
/* Write Register 11 (Clock Mode Control) */
#define TRxCXT 0 /* TRxC = Xtal output */
#define TRxCTC 1 /* TRxC = Transmit clock */
#define TRxCBR 2 /* TRxC = BR Generator Output */
#define TRxCDP 3 /* TRxC = DPLL output */
#define TRxCOI 4 /* TRxC O/I */
#define TCRTxCP 0 /* Transmit clock = RTxC pin */
#define TCTRxCP 8 /* Transmit clock = TRxC pin */
#define TCBR 0x10 /* Transmit clock = BR Generator output */
#define TCDPLL 0x18 /* Transmit clock = DPLL output */
#define RCRTxCP 0 /* Receive clock = RTxC pin */
#define RCTRxCP 0x20 /* Receive clock = TRxC pin */
#define RCBR 0x40 /* Receive clock = BR Generator output */
#define RCDPLL 0x60 /* Receive clock = DPLL output */
#define RTxCX 0x80 /* RTxC Xtal/No Xtal */
/* Write Register 12 (Lower Byte of Baud Rate Generator Time Constant) */
/* Write Register 13 (Upper Byte of Baud Rate Generator Time Constant) */
/* Write Register 14 (Miscellaneous Control Bits) */
#define BRENABL 1 /* Baud rate generator enable */
#define BRSRC 2 /* Baud rate generator source */
#define DTRREQ 4 /* DTR/Request function */
#define AUTOECHO 8 /* Auto Echo */
#define LOOPBAK 0x10 /* Local loopback */
#define SEARCH 0x20 /* Enter search mode */
#define RMC 0x40 /* Reset missing clock */
#define DISDPLL 0x60 /* Disable DPLL */
#define SSBR 0x80 /* Set DPLL source = BR generator */
#define SSRTxC 0xa0 /* Set DPLL source = RTxC */
#define SFMM 0xc0 /* Set FM mode */
#define SNRZI 0xe0 /* Set NRZI mode */
/* Write Register 15 (External/Status Interrupt Control) */
#define WR7P_EN 1 /* WR7 Prime SDLC Feature Enable */
#define ZCIE 2 /* Zero count IE */
#define DCDIE 8 /* DCD IE */
#define SYNCIE 0x10 /* Sync/hunt IE */
#define CTSIE 0x20 /* CTS IE */
#define TxUIE 0x40 /* Tx Underrun/EOM IE */
#define BRKIE 0x80 /* Break/Abort IE */
/* Read Register 0 (Transmit/Receive Buffer Status and External Status) */
#define Rx_CH_AV 0x1 /* Rx Character Available */
#define ZCOUNT 0x2 /* Zero count */
#define Tx_BUF_EMP 0x4 /* Tx Buffer empty */
#define DCD 0x8 /* DCD */
#define SYNC_HUNT 0x10 /* Sync/hunt */
#define CTS 0x20 /* CTS */
#define TxEOM 0x40 /* Tx underrun */
#define BRK_ABRT 0x80 /* Break/Abort */
/* Read Register 1 (Special Receive Condition Status) */
#define ALL_SNT 0x1 /* All sent */
/* Residue Data for 8 Rx bits/char programmed */
#define RES3 0x8 /* 0/3 */
#define RES4 0x4 /* 0/4 */
#define RES5 0xc /* 0/5 */
#define RES6 0x2 /* 0/6 */
#define RES7 0xa /* 0/7 */
#define RES8 0x6 /* 0/8 */
#define RES18 0xe /* 1/8 */
#define RES28 0x0 /* 2/8 */
/* Special Rx Condition Interrupts */
#define PAR_ERR 0x10 /* Parity Error */
#define Rx_OVR 0x20 /* Rx Overrun Error */
#define FRM_ERR 0x40 /* CRC/Framing Error */
#define END_FR 0x80 /* End of Frame (SDLC) */
/* Read Register 2 (Interrupt Vector (WR2) -- channel A). */
/* Read Register 2 (Modified Interrupt Vector -- channel B). */
/* Read Register 3 (Interrupt Pending Bits -- channel A only). */
#define CHBEXT 0x1 /* Channel B Ext/Stat IP */
#define CHBTxIP 0x2 /* Channel B Tx IP */
#define CHBRxIP 0x4 /* Channel B Rx IP */
#define CHAEXT 0x8 /* Channel A Ext/Stat IP */
#define CHATxIP 0x10 /* Channel A Tx IP */
#define CHARxIP 0x20 /* Channel A Rx IP */
/* Read Register 6 (SDLC FIFO Status and Byte Count LSB) */
/* Read Register 7 (SDLC FIFO Status and Byte Count MSB) */
/* Read Register 8 (Receive Data) */
/* Read Register 10 (Miscellaneous Status Bits) */
#define ONLOOP 2 /* On loop */
#define LOOPSEND 0x10 /* Loop sending */
#define CLK2MIS 0x40 /* Two clocks missing */
#define CLK1MIS 0x80 /* One clock missing */
/* Read Register 12 (Lower Byte of Baud Rate Generator Constant (WR12)) */
/* Read Register 13 (Upper Byte of Baud Rate Generator Constant (WR13) */
/* Read Register 15 (External/Status Interrupt Control (WR15)) */
#endif /* _SERIAL_ZS_H */