| /* 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 */ |
| |
| /* |
| * Async features |
| */ |
| |
| struct tty_struct *tty; /* Attached terminal */ |
| int line; /* Minor number */ |
| wait_queue_head_t open_wait; /* Tasks waiting to open */ |
| wait_queue_head_t close_wait; /* and for close to end */ |
| unsigned long event; /* Pending events */ |
| int fdcount; /* # of fd on device */ |
| int blocked_open; /* # of blocked opens */ |
| int x_char; /* XON/XOF char */ |
| unsigned char *xmit_buf; /* Transmit pointer */ |
| int xmit_head; /* Transmit ring */ |
| int xmit_tail; |
| int xmit_cnt; |
| int flags; |
| int timeout; |
| int xmit_fifo_size; /* Transmit FIFO info */ |
| |
| int close_delay; /* Do we wait for drain on close ? */ |
| unsigned short closing_wait; |
| |
| /* We need to know the current clock divisor |
| * to read the bps rate the chip has currently |
| * loaded. |
| */ |
| |
| unsigned char clk_divisor; /* May be 1, 16, 32, or 64 */ |
| int zs_baud; |
| |
| int magic; |
| int baud_base; /* Baud parameters */ |
| int custom_divisor; |
| |
| |
| unsigned char tx_active; /* character is being xmitted */ |
| unsigned char tx_stopped; /* output is suspended */ |
| |
| 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) */ |
