| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __PMAC_ZILOG_H__ |
| #define __PMAC_ZILOG_H__ |
| |
| /* |
| * At most 2 ESCCs with 2 ports each |
| */ |
| #define MAX_ZS_PORTS 4 |
| |
| /* |
| * We wrap our port structure around the generic uart_port. |
| */ |
| #define NUM_ZSREGS 17 |
| |
| struct uart_pmac_port { |
| struct uart_port port; |
| struct uart_pmac_port *mate; |
| |
| #ifdef CONFIG_PPC_PMAC |
| /* macio_dev for the escc holding this port (maybe be null on |
| * early inited port) |
| */ |
| struct macio_dev *dev; |
| /* device node to this port, this points to one of 2 childs |
| * of "escc" node (ie. ch-a or ch-b) |
| */ |
| struct device_node *node; |
| #else |
| struct platform_device *pdev; |
| #endif |
| |
| /* Port type as obtained from device tree (IRDA, modem, ...) */ |
| int port_type; |
| u8 curregs[NUM_ZSREGS]; |
| |
| unsigned int flags; |
| #define PMACZILOG_FLAG_IS_CONS 0x00000001 |
| #define PMACZILOG_FLAG_IS_KGDB 0x00000002 |
| #define PMACZILOG_FLAG_MODEM_STATUS 0x00000004 |
| #define PMACZILOG_FLAG_IS_CHANNEL_A 0x00000008 |
| #define PMACZILOG_FLAG_REGS_HELD 0x00000010 |
| #define PMACZILOG_FLAG_TX_STOPPED 0x00000020 |
| #define PMACZILOG_FLAG_TX_ACTIVE 0x00000040 |
| #define PMACZILOG_FLAG_IS_IRDA 0x00000100 |
| #define PMACZILOG_FLAG_IS_INTMODEM 0x00000200 |
| #define PMACZILOG_FLAG_RSRC_REQUESTED 0x00000800 |
| #define PMACZILOG_FLAG_IS_OPEN 0x00002000 |
| #define PMACZILOG_FLAG_IS_EXTCLK 0x00008000 |
| #define PMACZILOG_FLAG_BREAK 0x00010000 |
| |
| unsigned char parity_mask; |
| unsigned char prev_status; |
| |
| volatile u8 __iomem *control_reg; |
| volatile u8 __iomem *data_reg; |
| |
| unsigned char irq_name[8]; |
| }; |
| |
| #define to_pmz(p) ((struct uart_pmac_port *)(p)) |
| |
| static inline struct uart_pmac_port *pmz_get_port_A(struct uart_pmac_port *uap) |
| { |
| if (uap->flags & PMACZILOG_FLAG_IS_CHANNEL_A) |
| return uap; |
| return uap->mate; |
| } |
| |
| /* |
| * Register accessors. Note that we don't need to enforce a recovery |
| * delay on PCI PowerMac hardware, it's dealt in HW by the MacIO chip, |
| * though if we try to use this driver on older machines, we might have |
| * to add it back |
| */ |
| static inline u8 read_zsreg(struct uart_pmac_port *port, u8 reg) |
| { |
| if (reg != 0) |
| writeb(reg, port->control_reg); |
| return readb(port->control_reg); |
| } |
| |
| static inline void write_zsreg(struct uart_pmac_port *port, u8 reg, u8 value) |
| { |
| if (reg != 0) |
| writeb(reg, port->control_reg); |
| writeb(value, port->control_reg); |
| } |
| |
| static inline u8 read_zsdata(struct uart_pmac_port *port) |
| { |
| return readb(port->data_reg); |
| } |
| |
| static inline void write_zsdata(struct uart_pmac_port *port, u8 data) |
| { |
| writeb(data, port->data_reg); |
| } |
| |
| static inline void zssync(struct uart_pmac_port *port) |
| { |
| (void)readb(port->control_reg); |
| } |
| |
| /* 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) |
| |
| #define ZS_CLOCK 3686400 /* Z8530 RTxC input clock rate */ |
| |
| /* 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 R7P 16 |
| |
| #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 RxINT_MASK 0x18 |
| |
| #define WT_RDY_RT 0x20 /* W/Req reflects recv if 1, xmit if 0 */ |
| #define WT_FN_RDYFN 0x40 /* W/Req pin is DMA request if 1, wait if 0 */ |
| #define WT_RDY_ENAB 0x80 /* Enable W/Req pin */ |
| |
| /* 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 */ |
| #define RxN_MASK 0xc0 |
| |
| /* Write Register 4 */ |
| |
| #define PAR_ENAB 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 */ |
| |
| #define TxCRC_ENAB 0x1 /* Tx CRC Enable */ |
| #define RTS 0x2 /* RTS */ |
| #define SDLC_CRC 0x4 /* SDLC/CRC-16 */ |
| #define TxENABLE 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 TxN_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 7' (Some enhanced feature control) */ |
| #define ENEXREAD 0x40 /* Enable read of some write registers */ |
| |
| /* 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 BRENAB 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 EN85C30 1 /* Enable some 85c30-enhanced registers */ |
| #define ZCIE 2 /* Zero count IE */ |
| #define ENSTFIFO 4 /* Enable status FIFO (SDLC) */ |
| #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 */ |
| #define CHB_Tx_EMPTY 0x00 |
| #define CHB_EXT_STAT 0x02 |
| #define CHB_Rx_AVAIL 0x04 |
| #define CHB_SPECIAL 0x06 |
| #define CHA_Tx_EMPTY 0x08 |
| #define CHA_EXT_STAT 0x0a |
| #define CHA_Rx_AVAIL 0x0c |
| #define CHA_SPECIAL 0x0e |
| #define STATUS_MASK 0x06 |
| |
| /* 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) */ |
| |
| /* Misc macros */ |
| #define ZS_CLEARERR(port) (write_zsreg(port, 0, ERR_RES)) |
| #define ZS_CLEARFIFO(port) do { \ |
| read_zsdata(port); \ |
| read_zsdata(port); \ |
| read_zsdata(port); \ |
| } while(0) |
| |
| #define ZS_IS_CONS(UP) ((UP)->flags & PMACZILOG_FLAG_IS_CONS) |
| #define ZS_IS_KGDB(UP) ((UP)->flags & PMACZILOG_FLAG_IS_KGDB) |
| #define ZS_IS_CHANNEL_A(UP) ((UP)->flags & PMACZILOG_FLAG_IS_CHANNEL_A) |
| #define ZS_REGS_HELD(UP) ((UP)->flags & PMACZILOG_FLAG_REGS_HELD) |
| #define ZS_TX_STOPPED(UP) ((UP)->flags & PMACZILOG_FLAG_TX_STOPPED) |
| #define ZS_TX_ACTIVE(UP) ((UP)->flags & PMACZILOG_FLAG_TX_ACTIVE) |
| #define ZS_WANTS_MODEM_STATUS(UP) ((UP)->flags & PMACZILOG_FLAG_MODEM_STATUS) |
| #define ZS_IS_IRDA(UP) ((UP)->flags & PMACZILOG_FLAG_IS_IRDA) |
| #define ZS_IS_INTMODEM(UP) ((UP)->flags & PMACZILOG_FLAG_IS_INTMODEM) |
| #define ZS_IS_OPEN(UP) ((UP)->flags & PMACZILOG_FLAG_IS_OPEN) |
| #define ZS_IS_EXTCLK(UP) ((UP)->flags & PMACZILOG_FLAG_IS_EXTCLK) |
| |
| #endif /* __PMAC_ZILOG_H__ */ |
