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/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/bitops.h>
#include <linux/serial_core.h>
#include <linux/io.h>
#include <linux/gpio.h>
#define SCI_MAJOR 204
#define SCI_MINOR_START 8
/*
* SCI register subset common for all port types.
* Not all registers will exist on all parts.
*/
enum {
SCSMR, /* Serial Mode Register */
SCBRR, /* Bit Rate Register */
SCSCR, /* Serial Control Register */
SCxSR, /* Serial Status Register */
SCFCR, /* FIFO Control Register */
SCFDR, /* FIFO Data Count Register */
SCxTDR, /* Transmit (FIFO) Data Register */
SCxRDR, /* Receive (FIFO) Data Register */
SCLSR, /* Line Status Register */
SCTFDR, /* Transmit FIFO Data Count Register */
SCRFDR, /* Receive FIFO Data Count Register */
SCSPTR, /* Serial Port Register */
HSSRR, /* Sampling Rate Register */
SCPCR, /* Serial Port Control Register */
SCPDR, /* Serial Port Data Register */
SCDL, /* BRG Frequency Division Register */
SCCKS, /* BRG Clock Select Register */
HSRTRGR, /* Rx FIFO Data Count Trigger Register */
HSTTRGR, /* Tx FIFO Data Count Trigger Register */
SCIx_NR_REGS,
};
/* SCSMR (Serial Mode Register) */
#define SCSMR_C_A BIT(7) /* Communication Mode */
#define SCSMR_CSYNC BIT(7) /* - Clocked synchronous mode */
#define SCSMR_ASYNC 0 /* - Asynchronous mode */
#define SCSMR_CHR BIT(6) /* 7-bit Character Length */
#define SCSMR_PE BIT(5) /* Parity Enable */
#define SCSMR_ODD BIT(4) /* Odd Parity */
#define SCSMR_STOP BIT(3) /* Stop Bit Length */
#define SCSMR_CKS 0x0003 /* Clock Select */
/* Serial Mode Register, SCIFA/SCIFB only bits */
#define SCSMR_CKEDG BIT(12) /* Transmit/Receive Clock Edge Select */
#define SCSMR_SRC_MASK 0x0700 /* Sampling Control */
#define SCSMR_SRC_16 0x0000 /* Sampling rate 1/16 */
#define SCSMR_SRC_5 0x0100 /* Sampling rate 1/5 */
#define SCSMR_SRC_7 0x0200 /* Sampling rate 1/7 */
#define SCSMR_SRC_11 0x0300 /* Sampling rate 1/11 */
#define SCSMR_SRC_13 0x0400 /* Sampling rate 1/13 */
#define SCSMR_SRC_17 0x0500 /* Sampling rate 1/17 */
#define SCSMR_SRC_19 0x0600 /* Sampling rate 1/19 */
#define SCSMR_SRC_27 0x0700 /* Sampling rate 1/27 */
/* Serial Control Register, SCIFA/SCIFB only bits */
#define SCSCR_TDRQE BIT(15) /* Tx Data Transfer Request Enable */
#define SCSCR_RDRQE BIT(14) /* Rx Data Transfer Request Enable */
/* SCxSR (Serial Status Register) on SCI */
#define SCI_TDRE BIT(7) /* Transmit Data Register Empty */
#define SCI_RDRF BIT(6) /* Receive Data Register Full */
#define SCI_ORER BIT(5) /* Overrun Error */
#define SCI_FER BIT(4) /* Framing Error */
#define SCI_PER BIT(3) /* Parity Error */
#define SCI_TEND BIT(2) /* Transmit End */
#define SCI_RESERVED 0x03 /* All reserved bits */
#define SCI_DEFAULT_ERROR_MASK (SCI_PER | SCI_FER)
#define SCI_RDxF_CLEAR (u32)(~(SCI_RESERVED | SCI_RDRF))
#define SCI_ERROR_CLEAR (u32)(~(SCI_RESERVED | SCI_PER | SCI_FER | SCI_ORER))
#define SCI_TDxE_CLEAR (u32)(~(SCI_RESERVED | SCI_TEND | SCI_TDRE))
#define SCI_BREAK_CLEAR (u32)(~(SCI_RESERVED | SCI_PER | SCI_FER | SCI_ORER))
/* SCxSR (Serial Status Register) on SCIF, SCIFA, SCIFB, HSCIF */
#define SCIF_ER BIT(7) /* Receive Error */
#define SCIF_TEND BIT(6) /* Transmission End */
#define SCIF_TDFE BIT(5) /* Transmit FIFO Data Empty */
#define SCIF_BRK BIT(4) /* Break Detect */
#define SCIF_FER BIT(3) /* Framing Error */
#define SCIF_PER BIT(2) /* Parity Error */
#define SCIF_RDF BIT(1) /* Receive FIFO Data Full */
#define SCIF_DR BIT(0) /* Receive Data Ready */
/* SCIF only (optional) */
#define SCIF_PERC 0xf000 /* Number of Parity Errors */
#define SCIF_FERC 0x0f00 /* Number of Framing Errors */
/*SCIFA/SCIFB and SCIF on SH7705/SH7720/SH7721 only */
#define SCIFA_ORER BIT(9) /* Overrun Error */
#define SCIF_DEFAULT_ERROR_MASK (SCIF_PER | SCIF_FER | SCIF_BRK | SCIF_ER)
#define SCIF_RDxF_CLEAR (u32)(~(SCIF_DR | SCIF_RDF))
#define SCIF_ERROR_CLEAR (u32)(~(SCIF_PER | SCIF_FER | SCIF_ER))
#define SCIF_TDxE_CLEAR (u32)(~(SCIF_TDFE))
#define SCIF_BREAK_CLEAR (u32)(~(SCIF_PER | SCIF_FER | SCIF_BRK))
/* SCFCR (FIFO Control Register) */
#define SCFCR_RTRG1 BIT(7) /* Receive FIFO Data Count Trigger */
#define SCFCR_RTRG0 BIT(6)
#define SCFCR_TTRG1 BIT(5) /* Transmit FIFO Data Count Trigger */
#define SCFCR_TTRG0 BIT(4)
#define SCFCR_MCE BIT(3) /* Modem Control Enable */
#define SCFCR_TFRST BIT(2) /* Transmit FIFO Data Register Reset */
#define SCFCR_RFRST BIT(1) /* Receive FIFO Data Register Reset */
#define SCFCR_LOOP BIT(0) /* Loopback Test */
/* SCLSR (Line Status Register) on (H)SCIF */
#define SCLSR_TO BIT(2) /* Timeout */
#define SCLSR_ORER BIT(0) /* Overrun Error */
/* SCSPTR (Serial Port Register), optional */
#define SCSPTR_RTSIO BIT(7) /* Serial Port RTS# Pin Input/Output */
#define SCSPTR_RTSDT BIT(6) /* Serial Port RTS# Pin Data */
#define SCSPTR_CTSIO BIT(5) /* Serial Port CTS# Pin Input/Output */
#define SCSPTR_CTSDT BIT(4) /* Serial Port CTS# Pin Data */
#define SCSPTR_SCKIO BIT(3) /* Serial Port Clock Pin Input/Output */
#define SCSPTR_SCKDT BIT(2) /* Serial Port Clock Pin Data */
#define SCSPTR_SPB2IO BIT(1) /* Serial Port Break Input/Output */
#define SCSPTR_SPB2DT BIT(0) /* Serial Port Break Data */
/* HSSRR HSCIF */
#define HSCIF_SRE BIT(15) /* Sampling Rate Register Enable */
/* SCPCR (Serial Port Control Register), SCIFA/SCIFB only */
#define SCPCR_RTSC BIT(4) /* Serial Port RTS# Pin / Output Pin */
#define SCPCR_CTSC BIT(3) /* Serial Port CTS# Pin / Input Pin */
#define SCPCR_SCKC BIT(2) /* Serial Port SCK Pin / Output Pin */
#define SCPCR_RXDC BIT(1) /* Serial Port RXD Pin / Input Pin */
#define SCPCR_TXDC BIT(0) /* Serial Port TXD Pin / Output Pin */
/* SCPDR (Serial Port Data Register), SCIFA/SCIFB only */
#define SCPDR_RTSD BIT(4) /* Serial Port RTS# Output Pin Data */
#define SCPDR_CTSD BIT(3) /* Serial Port CTS# Input Pin Data */
#define SCPDR_SCKD BIT(2) /* Serial Port SCK Output Pin Data */
#define SCPDR_RXDD BIT(1) /* Serial Port RXD Input Pin Data */
#define SCPDR_TXDD BIT(0) /* Serial Port TXD Output Pin Data */
/*
* BRG Clock Select Register (Some SCIF and HSCIF)
* The Baud Rate Generator for external clock can provide a clock source for
* the sampling clock. It outputs either its frequency divided clock, or the
* (undivided) (H)SCK external clock.
*/
#define SCCKS_CKS BIT(15) /* Select (H)SCK (1) or divided SC_CLK (0) */
#define SCCKS_XIN BIT(14) /* SC_CLK uses bus clock (1) or SCIF_CLK (0) */
#define SCxSR_TEND(port) (((port)->type == PORT_SCI) ? SCI_TEND : SCIF_TEND)
#define SCxSR_RDxF(port) (((port)->type == PORT_SCI) ? SCI_RDRF : SCIF_DR | SCIF_RDF)
#define SCxSR_TDxE(port) (((port)->type == PORT_SCI) ? SCI_TDRE : SCIF_TDFE)
#define SCxSR_FER(port) (((port)->type == PORT_SCI) ? SCI_FER : SCIF_FER)
#define SCxSR_PER(port) (((port)->type == PORT_SCI) ? SCI_PER : SCIF_PER)
#define SCxSR_BRK(port) (((port)->type == PORT_SCI) ? 0x00 : SCIF_BRK)
#define SCxSR_ERRORS(port) (to_sci_port(port)->params->error_mask)
#define SCxSR_RDxF_CLEAR(port) \
(((port)->type == PORT_SCI) ? SCI_RDxF_CLEAR : SCIF_RDxF_CLEAR)
#define SCxSR_ERROR_CLEAR(port) \
(to_sci_port(port)->params->error_clear)
#define SCxSR_TDxE_CLEAR(port) \
(((port)->type == PORT_SCI) ? SCI_TDxE_CLEAR : SCIF_TDxE_CLEAR)
#define SCxSR_BREAK_CLEAR(port) \
(((port)->type == PORT_SCI) ? SCI_BREAK_CLEAR : SCIF_BREAK_CLEAR)
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