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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Description of Z8530 Z85C30 and Z85230 communications chips
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1998 Alan Cox <alan@lxorguk.ukuu.org.uk>
*/
#ifndef _Z8530_H
#define _Z8530_H
#include <linux/tty.h>
#include <linux/interrupt.h>
/* Conversion routines to/from brg time constants from/to bits
* per second.
*/
#define BRG_TO_BPS(brg, freq) ((freq) / 2 / ((brg) + 2))
#define BPS_TO_BRG(bps, freq) ((((freq) + (bps)) / (2 * (bps))) - 2)
/* The Zilog register set */
#define FLAG 0x7e
/* Write Register 0 */
#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 RPRIME 16 /* Indicate a prime register access on 230 */
#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 */
#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 INT_ALL_Rx 0x10 /* Int on all Rx Characters or error */
#define INT_ERR_Rx 0x18 /* Int on error only */
#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 */
#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 */
/* Write Register 4 */
#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 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 */
/* Write Register 5 */
#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 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 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 (misc 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 (Misc 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 PRIME 1 /* R5' etc register access (Z85C30/230 only) */
#define ZCIE 2 /* Zero count IE */
#define FIFOE 4 /* Z85230 only */
#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 */
#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 */
#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 CRC_ERR 0x40 /* CRC/Framing Error */
#define END_FR 0x80 /* End of Frame (SDLC) */
/* Read Register 2 (channel b only) - Interrupt vector */
/* Read Register 3 (interrupt pending register) ch 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 8 (receive data register) */
/* Read Register 10 (misc 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) */
/* Read Register 13 (upper byte of baud rate generator constant) */
/* Read Register 15 (value of WR 15) */
/*
* Interrupt handling functions for this SCC
*/
struct z8530_channel;
struct z8530_irqhandler
{
void (*rx)(struct z8530_channel *);
void (*tx)(struct z8530_channel *);
void (*status)(struct z8530_channel *);
};
/*
* A channel of the Z8530
*/
struct z8530_channel
{
struct z8530_irqhandler *irqs; /* IRQ handlers */
/*
* Synchronous
*/
u16 count; /* Buyes received */
u16 max; /* Most we can receive this frame */
u16 mtu; /* MTU of the device */
u8 *dptr; /* Pointer into rx buffer */
struct sk_buff *skb; /* Buffer dptr points into */
struct sk_buff *skb2; /* Pending buffer */
u8 status; /* Current DCD */
u8 dcdcheck; /* which bit to check for line */
u8 sync; /* Set if in sync mode */
u8 regs[32]; /* Register map for the chip */
u8 pendregs[32]; /* Pending register values */
struct sk_buff *tx_skb; /* Buffer being transmitted */
struct sk_buff *tx_next_skb; /* Next transmit buffer */
u8 *tx_ptr; /* Byte pointer into the buffer */
u8 *tx_next_ptr; /* Next pointer to use */
u8 *tx_dma_buf[2]; /* TX flip buffers for DMA */
u8 tx_dma_used; /* Flip buffer usage toggler */
u16 txcount; /* Count of bytes to transmit */
void (*rx_function)(struct z8530_channel *, struct sk_buff *);
/*
* Sync DMA
*/
u8 rxdma; /* DMA channels */
u8 txdma;
u8 rxdma_on; /* DMA active if flag set */
u8 txdma_on;
u8 dma_num; /* Buffer we are DMAing into */
u8 dma_ready; /* Is the other buffer free */
u8 dma_tx; /* TX is to use DMA */
u8 *rx_buf[2]; /* The flip buffers */
/*
* System
*/
struct z8530_dev *dev; /* Z85230 chip instance we are from */
unsigned long ctrlio; /* I/O ports */
unsigned long dataio;
/*
* For PC we encode this way.
*/
#define Z8530_PORT_SLEEP 0x80000000
#define Z8530_PORT_OF(x) ((x)&0xFFFF)
u32 rx_overrun; /* Overruns - not done yet */
u32 rx_crc_err;
/*
* Bound device pointers
*/
void *private; /* For our owner */
struct net_device *netdevice; /* Network layer device */
spinlock_t *lock; /* Device lock */
};
/*
* Each Z853x0 device.
*/
struct z8530_dev
{
char *name; /* Device instance name */
struct z8530_channel chanA; /* SCC channel A */
struct z8530_channel chanB; /* SCC channel B */
int type;
#define Z8530 0 /* NMOS dinosaur */
#define Z85C30 1 /* CMOS - better */
#define Z85230 2 /* CMOS with real FIFO */
int irq; /* Interrupt for the device */
int active; /* Soft interrupt enable - the Mac doesn't
always have a hard disable on its 8530s... */
spinlock_t lock;
};
/*
* Functions
*/
extern u8 z8530_dead_port[];
extern u8 z8530_hdlc_kilostream_85230[];
extern u8 z8530_hdlc_kilostream[];
irqreturn_t z8530_interrupt(int, void *);
void z8530_describe(struct z8530_dev *, char *mapping, unsigned long io);
int z8530_init(struct z8530_dev *);
int z8530_shutdown(struct z8530_dev *);
int z8530_sync_open(struct net_device *, struct z8530_channel *);
int z8530_sync_close(struct net_device *, struct z8530_channel *);
int z8530_sync_dma_open(struct net_device *, struct z8530_channel *);
int z8530_sync_dma_close(struct net_device *, struct z8530_channel *);
int z8530_sync_txdma_open(struct net_device *, struct z8530_channel *);
int z8530_sync_txdma_close(struct net_device *, struct z8530_channel *);
int z8530_channel_load(struct z8530_channel *, u8 *);
netdev_tx_t z8530_queue_xmit(struct z8530_channel *c, struct sk_buff *skb);
void z8530_null_rx(struct z8530_channel *c, struct sk_buff *skb);
/*
* Standard interrupt vector sets
*/
extern struct z8530_irqhandler z8530_sync, z8530_async, z8530_nop;
/*
* Asynchronous Interfacing
*/
/*
* The size of the serial xmit buffer is 1 page, or 4096 bytes
*/
#define SERIAL_XMIT_SIZE 4096
#define WAKEUP_CHARS 256
/*
* Events are used to schedule things to happen at timer-interrupt
* time, instead of at rs interrupt time.
*/
#define RS_EVENT_WRITE_WAKEUP 0
/* Internal flags used only by kernel/chr_drv/serial.c */
#define ZILOG_INITIALIZED 0x80000000 /* Serial port was initialized */
#define ZILOG_CALLOUT_ACTIVE 0x40000000 /* Call out device is active */
#define ZILOG_NORMAL_ACTIVE 0x20000000 /* Normal device is active */
#define ZILOG_BOOT_AUTOCONF 0x10000000 /* Autoconfigure port on bootup */
#define ZILOG_CLOSING 0x08000000 /* Serial port is closing */
#define ZILOG_CTS_FLOW 0x04000000 /* Do CTS flow control */
#define ZILOG_CHECK_CD 0x02000000 /* i.e., CLOCAL */
#endif /* !(_Z8530_H) */
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