linux/drivers/tty/serial/sh-sci.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2#include <linux/bitops.h>
   3#include <linux/serial_core.h>
   4#include <linux/io.h>
   5
   6#define SCI_MAJOR               204
   7#define SCI_MINOR_START         8
   8
   9
  10/*
  11 * SCI register subset common for all port types.
  12 * Not all registers will exist on all parts.
  13 */
  14enum {
  15        SCSMR,                          /* Serial Mode Register */
  16        SCBRR,                          /* Bit Rate Register */
  17        SCSCR,                          /* Serial Control Register */
  18        SCxSR,                          /* Serial Status Register */
  19        SCFCR,                          /* FIFO Control Register */
  20        SCFDR,                          /* FIFO Data Count Register */
  21        SCxTDR,                         /* Transmit (FIFO) Data Register */
  22        SCxRDR,                         /* Receive (FIFO) Data Register */
  23        SCLSR,                          /* Line Status Register */
  24        SCTFDR,                         /* Transmit FIFO Data Count Register */
  25        SCRFDR,                         /* Receive FIFO Data Count Register */
  26        SCSPTR,                         /* Serial Port Register */
  27        HSSRR,                          /* Sampling Rate Register */
  28        SCPCR,                          /* Serial Port Control Register */
  29        SCPDR,                          /* Serial Port Data Register */
  30        SCDL,                           /* BRG Frequency Division Register */
  31        SCCKS,                          /* BRG Clock Select Register */
  32        HSRTRGR,                        /* Rx FIFO Data Count Trigger Register */
  33        HSTTRGR,                        /* Tx FIFO Data Count Trigger Register */
  34        SEMR,                           /* Serial extended mode register */
  35
  36        SCIx_NR_REGS,
  37};
  38
  39
  40/* SCSMR (Serial Mode Register) */
  41#define SCSMR_C_A       BIT(7)  /* Communication Mode */
  42#define SCSMR_CSYNC     BIT(7)  /*   - Clocked synchronous mode */
  43#define SCSMR_ASYNC     0       /*   - Asynchronous mode */
  44#define SCSMR_CHR       BIT(6)  /* 7-bit Character Length */
  45#define SCSMR_PE        BIT(5)  /* Parity Enable */
  46#define SCSMR_ODD       BIT(4)  /* Odd Parity */
  47#define SCSMR_STOP      BIT(3)  /* Stop Bit Length */
  48#define SCSMR_CKS       0x0003  /* Clock Select */
  49
  50/* Serial Mode Register, SCIFA/SCIFB only bits */
  51#define SCSMR_CKEDG     BIT(12) /* Transmit/Receive Clock Edge Select */
  52#define SCSMR_SRC_MASK  0x0700  /* Sampling Control */
  53#define SCSMR_SRC_16    0x0000  /* Sampling rate 1/16 */
  54#define SCSMR_SRC_5     0x0100  /* Sampling rate 1/5 */
  55#define SCSMR_SRC_7     0x0200  /* Sampling rate 1/7 */
  56#define SCSMR_SRC_11    0x0300  /* Sampling rate 1/11 */
  57#define SCSMR_SRC_13    0x0400  /* Sampling rate 1/13 */
  58#define SCSMR_SRC_17    0x0500  /* Sampling rate 1/17 */
  59#define SCSMR_SRC_19    0x0600  /* Sampling rate 1/19 */
  60#define SCSMR_SRC_27    0x0700  /* Sampling rate 1/27 */
  61
  62/* Serial Control Register, SCIFA/SCIFB only bits */
  63#define SCSCR_TDRQE     BIT(15) /* Tx Data Transfer Request Enable */
  64#define SCSCR_RDRQE     BIT(14) /* Rx Data Transfer Request Enable */
  65
  66/* Serial Control Register, HSCIF-only bits */
  67#define HSSCR_TOT_SHIFT 14
  68
  69/* SCxSR (Serial Status Register) on SCI */
  70#define SCI_TDRE        BIT(7)  /* Transmit Data Register Empty */
  71#define SCI_RDRF        BIT(6)  /* Receive Data Register Full */
  72#define SCI_ORER        BIT(5)  /* Overrun Error */
  73#define SCI_FER         BIT(4)  /* Framing Error */
  74#define SCI_PER         BIT(3)  /* Parity Error */
  75#define SCI_TEND        BIT(2)  /* Transmit End */
  76#define SCI_RESERVED    0x03    /* All reserved bits */
  77
  78#define SCI_DEFAULT_ERROR_MASK (SCI_PER | SCI_FER)
  79
  80#define SCI_RDxF_CLEAR  (u32)(~(SCI_RESERVED | SCI_RDRF))
  81#define SCI_ERROR_CLEAR (u32)(~(SCI_RESERVED | SCI_PER | SCI_FER | SCI_ORER))
  82#define SCI_TDxE_CLEAR  (u32)(~(SCI_RESERVED | SCI_TEND | SCI_TDRE))
  83#define SCI_BREAK_CLEAR (u32)(~(SCI_RESERVED | SCI_PER | SCI_FER | SCI_ORER))
  84
  85/* SCxSR (Serial Status Register) on SCIF, SCIFA, SCIFB, HSCIF */
  86#define SCIF_ER         BIT(7)  /* Receive Error */
  87#define SCIF_TEND       BIT(6)  /* Transmission End */
  88#define SCIF_TDFE       BIT(5)  /* Transmit FIFO Data Empty */
  89#define SCIF_BRK        BIT(4)  /* Break Detect */
  90#define SCIF_FER        BIT(3)  /* Framing Error */
  91#define SCIF_PER        BIT(2)  /* Parity Error */
  92#define SCIF_RDF        BIT(1)  /* Receive FIFO Data Full */
  93#define SCIF_DR         BIT(0)  /* Receive Data Ready */
  94/* SCIF only (optional) */
  95#define SCIF_PERC       0xf000  /* Number of Parity Errors */
  96#define SCIF_FERC       0x0f00  /* Number of Framing Errors */
  97/*SCIFA/SCIFB and SCIF on SH7705/SH7720/SH7721 only */
  98#define SCIFA_ORER      BIT(9)  /* Overrun Error */
  99
 100#define SCIF_DEFAULT_ERROR_MASK (SCIF_PER | SCIF_FER | SCIF_BRK | SCIF_ER)
 101
 102#define SCIF_RDxF_CLEAR         (u32)(~(SCIF_DR | SCIF_RDF))
 103#define SCIF_ERROR_CLEAR        (u32)(~(SCIF_PER | SCIF_FER | SCIF_ER))
 104#define SCIF_TDxE_CLEAR         (u32)(~(SCIF_TDFE))
 105#define SCIF_BREAK_CLEAR        (u32)(~(SCIF_PER | SCIF_FER | SCIF_BRK))
 106
 107/* SCFCR (FIFO Control Register) */
 108#define SCFCR_RTRG1     BIT(7)  /* Receive FIFO Data Count Trigger */
 109#define SCFCR_RTRG0     BIT(6)
 110#define SCFCR_TTRG1     BIT(5)  /* Transmit FIFO Data Count Trigger */
 111#define SCFCR_TTRG0     BIT(4)
 112#define SCFCR_MCE       BIT(3)  /* Modem Control Enable */
 113#define SCFCR_TFRST     BIT(2)  /* Transmit FIFO Data Register Reset */
 114#define SCFCR_RFRST     BIT(1)  /* Receive FIFO Data Register Reset */
 115#define SCFCR_LOOP      BIT(0)  /* Loopback Test */
 116
 117/* SCLSR (Line Status Register) on (H)SCIF */
 118#define SCLSR_TO        BIT(2)  /* Timeout */
 119#define SCLSR_ORER      BIT(0)  /* Overrun Error */
 120
 121/* SCSPTR (Serial Port Register), optional */
 122#define SCSPTR_RTSIO    BIT(7)  /* Serial Port RTS# Pin Input/Output */
 123#define SCSPTR_RTSDT    BIT(6)  /* Serial Port RTS# Pin Data */
 124#define SCSPTR_CTSIO    BIT(5)  /* Serial Port CTS# Pin Input/Output */
 125#define SCSPTR_CTSDT    BIT(4)  /* Serial Port CTS# Pin Data */
 126#define SCSPTR_SCKIO    BIT(3)  /* Serial Port Clock Pin Input/Output */
 127#define SCSPTR_SCKDT    BIT(2)  /* Serial Port Clock Pin Data */
 128#define SCSPTR_SPB2IO   BIT(1)  /* Serial Port Break Input/Output */
 129#define SCSPTR_SPB2DT   BIT(0)  /* Serial Port Break Data */
 130
 131/* HSSRR HSCIF */
 132#define HSCIF_SRE       BIT(15) /* Sampling Rate Register Enable */
 133#define HSCIF_SRDE      BIT(14) /* Sampling Point Register Enable */
 134
 135#define HSCIF_SRHP_SHIFT        8
 136#define HSCIF_SRHP_MASK         0x0f00
 137
 138/* SCPCR (Serial Port Control Register), SCIFA/SCIFB only */
 139#define SCPCR_RTSC      BIT(4)  /* Serial Port RTS# Pin / Output Pin */
 140#define SCPCR_CTSC      BIT(3)  /* Serial Port CTS# Pin / Input Pin */
 141#define SCPCR_SCKC      BIT(2)  /* Serial Port SCK Pin / Output Pin */
 142#define SCPCR_RXDC      BIT(1)  /* Serial Port RXD Pin / Input Pin */
 143#define SCPCR_TXDC      BIT(0)  /* Serial Port TXD Pin / Output Pin */
 144
 145/* SCPDR (Serial Port Data Register), SCIFA/SCIFB only */
 146#define SCPDR_RTSD      BIT(4)  /* Serial Port RTS# Output Pin Data */
 147#define SCPDR_CTSD      BIT(3)  /* Serial Port CTS# Input Pin Data */
 148#define SCPDR_SCKD      BIT(2)  /* Serial Port SCK Output Pin Data */
 149#define SCPDR_RXDD      BIT(1)  /* Serial Port RXD Input Pin Data */
 150#define SCPDR_TXDD      BIT(0)  /* Serial Port TXD Output Pin Data */
 151
 152/*
 153 * BRG Clock Select Register (Some SCIF and HSCIF)
 154 * The Baud Rate Generator for external clock can provide a clock source for
 155 * the sampling clock. It outputs either its frequency divided clock, or the
 156 * (undivided) (H)SCK external clock.
 157 */
 158#define SCCKS_CKS       BIT(15) /* Select (H)SCK (1) or divided SC_CLK (0) */
 159#define SCCKS_XIN       BIT(14) /* SC_CLK uses bus clock (1) or SCIF_CLK (0) */
 160
 161#define SCxSR_TEND(port)        (((port)->type == PORT_SCI) ? SCI_TEND   : SCIF_TEND)
 162#define SCxSR_RDxF(port)        (((port)->type == PORT_SCI) ? SCI_RDRF   : SCIF_DR | SCIF_RDF)
 163#define SCxSR_TDxE(port)        (((port)->type == PORT_SCI) ? SCI_TDRE   : SCIF_TDFE)
 164#define SCxSR_FER(port)         (((port)->type == PORT_SCI) ? SCI_FER    : SCIF_FER)
 165#define SCxSR_PER(port)         (((port)->type == PORT_SCI) ? SCI_PER    : SCIF_PER)
 166#define SCxSR_BRK(port)         (((port)->type == PORT_SCI) ? 0x00       : SCIF_BRK)
 167
 168#define SCxSR_ERRORS(port)      (to_sci_port(port)->params->error_mask)
 169
 170#define SCxSR_RDxF_CLEAR(port) \
 171        (((port)->type == PORT_SCI) ? SCI_RDxF_CLEAR : SCIF_RDxF_CLEAR)
 172#define SCxSR_ERROR_CLEAR(port) \
 173        (to_sci_port(port)->params->error_clear)
 174#define SCxSR_TDxE_CLEAR(port) \
 175        (((port)->type == PORT_SCI) ? SCI_TDxE_CLEAR : SCIF_TDxE_CLEAR)
 176#define SCxSR_BREAK_CLEAR(port) \
 177        (((port)->type == PORT_SCI) ? SCI_BREAK_CLEAR : SCIF_BREAK_CLEAR)
 178