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|
/*
* Copy and modify from linux/drivers/serial/sh-sci.h
*/
#include <dm/platform_data/serial_sh.h>
struct uart_port {
unsigned long iobase; /* in/out[bwl] */
unsigned char *membase; /* read/write[bwl] */
unsigned long mapbase; /* for ioremap */
enum sh_serial_type type; /* port type */
enum sh_clk_mode clk_mode; /* clock mode */
};
#if defined(CONFIG_CPU_SH7721) || \
defined(CONFIG_R8A7740)
# define SCSCR_INIT(port) 0x0030 /* TIE=0,RIE=0,TE=1,RE=1 */
# define PORT_PTCR 0xA405011EUL
# define PORT_PVCR 0xA4050122UL
# define SCIF_ORER 0x0200 /* overrun error bit */
#elif defined(CONFIG_CPU_SH7750) || \
defined(CONFIG_CPU_SH7750R) || \
defined(CONFIG_CPU_SH7750S) || \
defined(CONFIG_CPU_SH7751) || \
defined(CONFIG_CPU_SH7751R)
# define SCSPTR1 0xffe0001c /* 8 bit SCI */
# define SCSPTR2 0xFFE80020 /* 16 bit SCIF */
# define SCIF_ORER 0x0001 /* overrun error bit */
# define SCSCR_INIT(port) (((port)->type == PORT_SCI) ? \
0x30 /* TIE=0,RIE=0,TE=1,RE=1 */ : \
0x38 /* TIE=0,RIE=0,TE=1,RE=1,REIE=1 */)
#elif defined(CONFIG_CPU_SH7722)
# define PADR 0xA4050120
# undef PSDR
# define PSDR 0xA405013e
# define PWDR 0xA4050166
# define PSCR 0xA405011E
# define SCIF_ORER 0x0001 /* overrun error bit */
# define SCSCR_INIT(port) 0x0038 /* TIE=0,RIE=0,TE=1,RE=1,REIE=1 */
#elif defined(CONFIG_CPU_SH7723)
# define SCSPTR0 0xa4050160
# define SCSPTR1 0xa405013e
# define SCSPTR2 0xa4050160
# define SCSPTR3 0xa405013e
# define SCSPTR4 0xa4050128
# define SCSPTR5 0xa4050128
# define SCIF_ORER 0x0001 /* overrun error bit */
# define SCSCR_INIT(port) 0x0038 /* TIE=0,RIE=0,TE=1,RE=1,REIE=1 */
#elif defined(CONFIG_CPU_SH7734)
# define SCSPTR0 0xFFE40020
# define SCSPTR1 0xFFE41020
# define SCSPTR2 0xFFE42020
# define SCSPTR3 0xFFE43020
# define SCSPTR4 0xFFE44020
# define SCSPTR5 0xFFE45020
# define SCIF_ORER 0x0001 /* overrun error bit */
# define SCSCR_INIT(port) 0x0038 /* TIE=0,RIE=0,TE=1,RE=1,REIE=1 */
#elif defined(CONFIG_CPU_SH7757) || \
defined(CONFIG_CPU_SH7752) || \
defined(CONFIG_CPU_SH7753)
# define SCSPTR0 0xfe4b0020
# define SCSPTR1 0xfe4b0020
# define SCSPTR2 0xfe4b0020
# define SCIF_ORER 0x0001
# define SCSCR_INIT(port) 0x38
# define SCIF_ONLY
#elif defined(CONFIG_CPU_SH7763)
# define SCSPTR0 0xffe00024 /* 16 bit SCIF */
# define SCSPTR1 0xffe08024 /* 16 bit SCIF */
# define SCSPTR2 0xffe10020 /* 16 bit SCIF/IRDA */
# define SCIF_ORER 0x0001 /* overrun error bit */
# define SCSCR_INIT(port) 0x38 /* TIE=0,RIE=0,TE=1,RE=1,REIE=1 */
#elif defined(CONFIG_CPU_SH7780)
# define SCSPTR0 0xffe00024 /* 16 bit SCIF */
# define SCSPTR1 0xffe10024 /* 16 bit SCIF */
# define SCIF_ORER 0x0001 /* Overrun error bit */
/* TIE=0,RIE=0,TE=1,RE=1,REIE=1,CKE1=1 */
# define SCSCR_INIT(port) 0x3a
#elif defined(CONFIG_RZA1)
# define SCSPTR0 0xe8007020 /* 16 bit SCIF */
# define SCSPTR1 0xe8007820 /* 16 bit SCIF */
# define SCSPTR2 0xe8008020 /* 16 bit SCIF */
# define SCSPTR3 0xe8008820 /* 16 bit SCIF */
# define SCSPTR4 0xe8009020 /* 16 bit SCIF */
# define SCSPTR5 0xe8009820 /* 16 bit SCIF */
# define SCSPTR6 0xe800a020 /* 16 bit SCIF */
# define SCSPTR7 0xe800a820 /* 16 bit SCIF */
# define SCSCR_INIT(port) 0x38 /* TIE=0,RIE=0,TE=1,RE=1,REIE=1 */
# define SCIF_ORER 0x0001 /* overrun error bit */
#elif defined(CONFIG_RCAR_GEN2) || defined(CONFIG_RCAR_GEN3) || \
defined(CONFIG_R7S72100)
# if defined(CFG_SCIF_A)
# define SCIF_ORER 0x0200
# else
# define SCIF_ORER 0x0001
# endif
# define SCSCR_INIT(port) (port->clk_mode == EXT_CLK ? 0x32 : 0x30)
/* TIE=0,RIE=0,TE=1,RE=1,REIE=0, */
#else
# error CPU subtype not defined
#endif
/* SCSCR */
#define SCI_CTRL_FLAGS_TIE 0x80 /* all */
#define SCI_CTRL_FLAGS_RIE 0x40 /* all */
#define SCI_CTRL_FLAGS_TE 0x20 /* all */
#define SCI_CTRL_FLAGS_RE 0x10 /* all */
#if defined(CONFIG_CPU_SH7750) || \
defined(CONFIG_CPU_SH7750R) || \
defined(CONFIG_CPU_SH7722) || \
defined(CONFIG_CPU_SH7734) || \
defined(CONFIG_CPU_SH7750S) || \
defined(CONFIG_CPU_SH7751) || \
defined(CONFIG_CPU_SH7751R) || \
defined(CONFIG_CPU_SH7763) || \
defined(CONFIG_CPU_SH7780)
#define SCI_CTRL_FLAGS_REIE 0x08 /* 7750 SCIF */
#else
#define SCI_CTRL_FLAGS_REIE 0
#endif
/* SCI_CTRL_FLAGS_MPIE 0x08 * 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
/* SCI_CTRL_FLAGS_TEIE 0x04 * 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
/* SCI_CTRL_FLAGS_CKE1 0x02 * all */
/* SCI_CTRL_FLAGS_CKE0 0x01 * 7707 SCI/SCIF, 7708 SCI, 7709 SCI/SCIF, 7750 SCI */
/* SCxSR SCI */
#define SCI_TDRE 0x80 /* 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
#define SCI_RDRF 0x40 /* 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
#define SCI_ORER 0x20 /* 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
#define SCI_FER 0x10 /* 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
#define SCI_PER 0x08 /* 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
#define SCI_TEND 0x04 /* 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
/* SCI_MPB 0x02 * 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
/* SCI_MPBT 0x01 * 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
#define SCI_ERRORS ( SCI_PER | SCI_FER | SCI_ORER)
/* SCxSR SCIF */
#define SCIF_ER 0x0080 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
#define SCIF_TEND 0x0040 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
#define SCIF_TDFE 0x0020 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
#define SCIF_BRK 0x0010 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
#define SCIF_FER 0x0008 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
#define SCIF_PER 0x0004 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
#define SCIF_RDF 0x0002 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
#define SCIF_DR 0x0001 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
#if defined(CONFIG_CPU_SH7721) || \
defined(CONFIG_R8A7740)
# define SCIF_ORER 0x0200
# define SCIF_ERRORS (SCIF_PER | SCIF_FER | SCIF_ER | SCIF_BRK | SCIF_ORER)
# define SCIF_RFDC_MASK 0x007f
# define SCIF_TXROOM_MAX 64
#elif defined(CONFIG_CPU_SH7763)
# define SCIF_ERRORS (SCIF_PER | SCIF_FER | SCIF_ER | SCIF_BRK)
# define SCIF_RFDC_MASK 0x007f
# define SCIF_TXROOM_MAX 64
/* SH7763 SCIF2 support */
# define SCIF2_RFDC_MASK 0x001f
# define SCIF2_TXROOM_MAX 16
#elif defined(CONFIG_RCAR_GEN2)
# define SCIF_ERRORS (SCIF_PER | SCIF_FER | SCIF_ER | SCIF_BRK)
# if defined(CFG_SCIF_A)
# define SCIF_RFDC_MASK 0x007f
# else
# define SCIF_RFDC_MASK 0x001f
# endif
#else
# define SCIF_ERRORS (SCIF_PER | SCIF_FER | SCIF_ER | SCIF_BRK)
# define SCIF_RFDC_MASK 0x001f
# define SCIF_TXROOM_MAX 16
#endif
#ifndef SCIF_ORER
#define SCIF_ORER 0x0000
#endif
#define SCxSR_TEND(port)\
(((port)->type == PORT_SCI) ? SCI_TEND : SCIF_TEND)
#define SCxSR_ERRORS(port)\
(((port)->type == PORT_SCI) ? SCI_ERRORS : SCIF_ERRORS)
#define SCxSR_RDxF(port)\
(((port)->type == PORT_SCI) ? SCI_RDRF : 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_ORER(port)\
(((port)->type == PORT_SCI) ? SCI_ORER : SCIF_ORER)
#if defined(CONFIG_CPU_SH7721) || \
defined(CONFIG_R8A7740)
# define SCxSR_RDxF_CLEAR(port) (sci_in(port, SCxSR) & 0xfffc)
# define SCxSR_ERROR_CLEAR(port) (sci_in(port, SCxSR) & 0xfd73)
# define SCxSR_TDxE_CLEAR(port) (sci_in(port, SCxSR) & 0xffdf)
# define SCxSR_BREAK_CLEAR(port) (sci_in(port, SCxSR) & 0xffe3)
#else
# define SCxSR_RDxF_CLEAR(port) (((port)->type == PORT_SCI) ? 0xbc : 0x00fc)
# define SCxSR_ERROR_CLEAR(port) (((port)->type == PORT_SCI) ? 0xc4 : 0x0073)
# define SCxSR_TDxE_CLEAR(port) (((port)->type == PORT_SCI) ? 0x78 : 0x00df)
# define SCxSR_BREAK_CLEAR(port) (((port)->type == PORT_SCI) ? 0xc4 : 0x00e3)
#endif
/* SCFCR */
#define SCFCR_RFRST 0x0002
#define SCFCR_TFRST 0x0004
#define SCFCR_TCRST 0x4000
#define SCFCR_MCE 0x0008
#define SCI_MAJOR 204
#define SCI_MINOR_START 8
/* Generic serial flags */
#define SCI_RX_THROTTLE 0x0000001
#define SCI_MAGIC 0xbabeface
/*
* Events are used to schedule things to happen at timer-interrupt
* time, instead of at rs interrupt time.
*/
#define SCI_EVENT_WRITE_WAKEUP 0
#define SCI_IN(size, offset)\
if ((size) == 8) {\
return readb(port->membase + (offset));\
} else {\
return readw(port->membase + (offset));\
}
#define SCI_OUT(size, offset, value)\
if ((size) == 8) {\
writeb(value, port->membase + (offset));\
} else if ((size) == 16) {\
writew(value, port->membase + (offset));\
}
#define CPU_SCIx_FNS(name, sci_offset, sci_size, scif_offset, scif_size)\
static inline unsigned int sci_##name##_in(struct uart_port *port) {\
if (port->type == PORT_SCIF || port->type == PORT_SCIFB) {\
SCI_IN(scif_size, scif_offset)\
} else { /* PORT_SCI or PORT_SCIFA */\
SCI_IN(sci_size, sci_offset);\
}\
}\
static inline void sci_##name##_out(struct uart_port *port,\
unsigned int value) {\
if (port->type == PORT_SCIF || port->type == PORT_SCIFB) {\
SCI_OUT(scif_size, scif_offset, value)\
} else { /* PORT_SCI or PORT_SCIFA */\
SCI_OUT(sci_size, sci_offset, value);\
}\
}
#define CPU_SCIF_FNS(name, scif_offset, scif_size) \
static inline unsigned int sci_##name##_in(struct uart_port *port) {\
SCI_IN(scif_size, scif_offset);\
}\
static inline void sci_##name##_out(struct uart_port *port,\
unsigned int value) {\
SCI_OUT(scif_size, scif_offset, value);\
}
#define CPU_SCI_FNS(name, sci_offset, sci_size)\
static inline unsigned int sci_##name##_in(struct uart_port *port) {\
SCI_IN(sci_size, sci_offset);\
}\
static inline void sci_##name##_out(struct uart_port *port,\
unsigned int value) {\
SCI_OUT(sci_size, sci_offset, value);\
}
#if defined(CONFIG_R8A7740)
#if defined(CONFIG_CPU_SH7721) || \
defined(CONFIG_SH73A0)
#define SCIF_FNS(name, scif_offset, scif_size) \
CPU_SCIF_FNS(name, scif_offset, scif_size)
#elif defined(CONFIG_R8A7740)
#define SCIx_FNS(name, sh4_scifa_offset, sh4_scifa_size,\
sh4_scifb_offset, sh4_scifb_size) \
CPU_SCIx_FNS(name, sh4_scifa_offset, sh4_scifa_size,\
sh4_scifb_offset, sh4_scifb_size)
#define SCIF_FNS(name, scif_offset, scif_size) \
CPU_SCIF_FNS(name, scif_offset, scif_size)
#else
#define SCIx_FNS(name, sh3_sci_offset, sh3_sci_size,\
sh4_sci_offset, sh4_sci_size, \
sh3_scif_offset, sh3_scif_size,\
sh4_scif_offset, sh4_scif_size, \
h8_sci_offset, h8_sci_size) \
CPU_SCIx_FNS(name, sh3_sci_offset, sh3_sci_size,\
sh3_scif_offset, sh3_scif_size)
#define SCIF_FNS(name, sh3_scif_offset, sh3_scif_size,\
sh4_scif_offset, sh4_scif_size) \
CPU_SCIF_FNS(name, sh3_scif_offset, sh3_scif_size)
#endif
#elif defined(CONFIG_CPU_SH7723)
#define SCIx_FNS(name, sh4_scifa_offset, sh4_scifa_size,\
sh4_scif_offset, sh4_scif_size) \
CPU_SCIx_FNS(name, sh4_scifa_offset, sh4_scifa_size,\
sh4_scif_offset, sh4_scif_size)
#define SCIF_FNS(name, sh4_scif_offset, sh4_scif_size) \
CPU_SCIF_FNS(name, sh4_scif_offset, sh4_scif_size)
#else
#define SCIx_FNS(name, sh3_sci_offset, sh3_sci_size,\
sh4_sci_offset, sh4_sci_size, \
sh3_scif_offset, sh3_scif_size,\
sh4_scif_offset, sh4_scif_size, \
h8_sci_offset, h8_sci_size) \
CPU_SCIx_FNS(name, sh4_sci_offset, sh4_sci_size,\
sh4_scif_offset, sh4_scif_size)
#define SCIF_FNS(name, sh3_scif_offset, sh3_scif_size, \
sh4_scif_offset, sh4_scif_size) \
CPU_SCIF_FNS(name, sh4_scif_offset, sh4_scif_size)
#endif
#if defined(CONFIG_CPU_SH7721)
SCIF_FNS(SCSMR, 0x00, 16)
SCIF_FNS(SCBRR, 0x04, 8)
SCIF_FNS(SCSCR, 0x08, 16)
SCIF_FNS(SCTDSR, 0x0c, 8)
SCIF_FNS(SCFER, 0x10, 16)
SCIF_FNS(SCxSR, 0x14, 16)
SCIF_FNS(SCFCR, 0x18, 16)
SCIF_FNS(SCFDR, 0x1c, 16)
SCIF_FNS(SCxTDR, 0x20, 8)
SCIF_FNS(SCxRDR, 0x24, 8)
SCIF_FNS(SCLSR, 0x00, 0)
SCIF_FNS(DL, 0x00, 0) /* dummy */
#elif defined(CONFIG_R8A7740)
SCIF_FNS(SCSMR, 0x00, 16)
SCIF_FNS(SCBRR, 0x04, 8)
SCIF_FNS(SCSCR, 0x08, 16)
SCIF_FNS(SCTDSR, 0x0c, 16)
SCIF_FNS(SCFER, 0x10, 16)
SCIF_FNS(SCxSR, 0x14, 16)
SCIF_FNS(SCFCR, 0x18, 16)
SCIF_FNS(SCFDR, 0x1c, 16)
SCIF_FNS(SCTFDR, 0x38, 16)
SCIF_FNS(SCRFDR, 0x3c, 16)
SCIx_FNS(SCxTDR, 0x20, 8, 0x40, 8)
SCIx_FNS(SCxRDR, 0x24, 8, 0x60, 8)
SCIF_FNS(SCLSR, 0x00, 0)
SCIF_FNS(DL, 0x00, 0) /* dummy */
#elif defined(CONFIG_CPU_SH7723)
SCIx_FNS(SCSMR, 0x00, 16, 0x00, 16)
SCIx_FNS(SCBRR, 0x04, 8, 0x04, 8)
SCIx_FNS(SCSCR, 0x08, 16, 0x08, 16)
SCIx_FNS(SCxTDR, 0x20, 8, 0x0c, 8)
SCIx_FNS(SCxSR, 0x14, 16, 0x10, 16)
SCIx_FNS(SCxRDR, 0x24, 8, 0x14, 8)
SCIx_FNS(SCSPTR, 0, 0, 0, 0)
SCIF_FNS(SCTDSR, 0x0c, 8)
SCIF_FNS(SCFER, 0x10, 16)
SCIF_FNS(SCFCR, 0x18, 16)
SCIF_FNS(SCFDR, 0x1c, 16)
SCIF_FNS(SCLSR, 0x24, 16)
SCIF_FNS(DL, 0x00, 0) /* dummy */
#elif defined(CONFIG_RCAR_GEN2)
/* SCIFA and SCIF register offsets and size */
SCIx_FNS(SCSMR, 0, 0, 0x00, 16, 0, 0, 0x00, 16, 0, 0)
SCIx_FNS(SCBRR, 0, 0, 0x04, 8, 0, 0, 0x04, 8, 0, 0)
SCIx_FNS(SCSCR, 0, 0, 0x08, 16, 0, 0, 0x08, 16, 0, 0)
SCIx_FNS(SCxTDR, 0, 0, 0x20, 8, 0, 0, 0x0C, 8, 0, 0)
SCIx_FNS(SCxSR, 0, 0, 0x14, 16, 0, 0, 0x10, 16, 0, 0)
SCIx_FNS(SCxRDR, 0, 0, 0x24, 8, 0, 0, 0x14, 8, 0, 0)
SCIF_FNS(SCFCR, 0, 0, 0x18, 16)
SCIF_FNS(SCFDR, 0, 0, 0x1C, 16)
SCIF_FNS(SCSPTR, 0, 0, 0x20, 16)
SCIF_FNS(DL, 0, 0, 0x30, 16)
SCIF_FNS(CKS, 0, 0, 0x34, 16)
#if defined(CFG_SCIF_A)
SCIF_FNS(SCLSR, 0, 0, 0x14, 16)
#else
SCIF_FNS(SCLSR, 0, 0, 0x24, 16)
#endif
#else
/* reg SCI/SH3 SCI/SH4 SCIF/SH3 SCIF/SH4 SCI/H8*/
/* name off sz off sz off sz off sz off sz*/
SCIx_FNS(SCSMR, 0x00, 8, 0x00, 8, 0x00, 8, 0x00, 16, 0x00, 8)
SCIx_FNS(SCBRR, 0x02, 8, 0x04, 8, 0x02, 8, 0x04, 8, 0x01, 8)
SCIx_FNS(SCSCR, 0x04, 8, 0x08, 8, 0x04, 8, 0x08, 16, 0x02, 8)
SCIx_FNS(SCxTDR, 0x06, 8, 0x0c, 8, 0x06, 8, 0x0C, 8, 0x03, 8)
SCIx_FNS(SCxSR, 0x08, 8, 0x10, 8, 0x08, 16, 0x10, 16, 0x04, 8)
SCIx_FNS(SCxRDR, 0x0a, 8, 0x14, 8, 0x0A, 8, 0x14, 8, 0x05, 8)
SCIF_FNS(SCFCR, 0x0c, 8, 0x18, 16)
#if defined(CONFIG_CPU_SH7780)
SCIF_FNS(SCFDR, 0x0e, 16, 0x1C, 16)
SCIF_FNS(SCTFDR, 0x0e, 16, 0x1C, 16)
SCIF_FNS(SCRFDR, 0x0e, 16, 0x20, 16)
SCIF_FNS(SCSPTR, 0, 0, 0x24, 16)
SCIF_FNS(SCLSR, 0, 0, 0x28, 16)
#elif defined(CONFIG_CPU_SH7763)
SCIF_FNS(SCFDR, 0, 0, 0x1C, 16)
SCIF_FNS(SCSPTR2, 0, 0, 0x20, 16)
SCIF_FNS(SCLSR2, 0, 0, 0x24, 16)
SCIF_FNS(SCTFDR, 0x0e, 16, 0x1C, 16)
SCIF_FNS(SCRFDR, 0x0e, 16, 0x20, 16)
SCIF_FNS(SCSPTR, 0, 0, 0x24, 16)
SCIF_FNS(SCLSR, 0, 0, 0x28, 16)
#else
SCIF_FNS(SCFDR, 0x0e, 16, 0x1C, 16)
#if defined(CONFIG_CPU_SH7722)
SCIF_FNS(SCSPTR, 0, 0, 0, 0)
#else
SCIF_FNS(SCSPTR, 0, 0, 0x20, 16)
#endif
SCIF_FNS(SCLSR, 0, 0, 0x24, 16)
#endif
SCIF_FNS(DL, 0, 0, 0x0, 0) /* dummy */
#endif
#define sci_in(port, reg) sci_##reg##_in(port)
#define sci_out(port, reg, value) sci_##reg##_out(port, value)
#if defined(CONFIG_CPU_SH7750) || \
defined(CONFIG_CPU_SH7751) || \
defined(CONFIG_CPU_SH7751R) || \
defined(CONFIG_CPU_SH7750R) || \
defined(CONFIG_CPU_SH7750S)
static inline int sci_rxd_in(struct uart_port *port)
{
if (port->mapbase == 0xffe00000)
return __raw_readb(SCSPTR1)&0x01 ? 1 : 0; /* SCI */
return 1;
}
#else /* default case for non-SCI processors */
static inline int sci_rxd_in(struct uart_port *port)
{
return 1;
}
#endif
/*
* Values for the BitRate Register (SCBRR)
*
* The values are actually divisors for a frequency which can
* be internal to the SH3 (14.7456MHz) or derived from an external
* clock source. This driver assumes the internal clock is used;
* to support using an external clock source, config options or
* possibly command-line options would need to be added.
*
* Also, to support speeds below 2400 (why?) the lower 2 bits of
* the SCSMR register would also need to be set to non-zero values.
*
* -- Greg Banks 27Feb2000
*
* Answer: The SCBRR register is only eight bits, and the value in
* it gets larger with lower baud rates. At around 2400 (depending on
* the peripherial module clock) you run out of bits. However the
* lower two bits of SCSMR allow the module clock to be divided down,
* scaling the value which is needed in SCBRR.
*
* -- Stuart Menefy - 23 May 2000
*
* I meant, why would anyone bother with bitrates below 2400.
*
* -- Greg Banks - 7Jul2000
*
* You "speedist"! How will I use my 110bps ASR-33 teletype with paper
* tape reader as a console!
*
* -- Mitch Davis - 15 Jul 2000
*/
#if defined(CONFIG_CPU_SH7780)
#define SCBRR_VALUE(bps, clk) ((clk+16*bps)/(16*bps)-1)
#elif defined(CONFIG_CPU_SH7721) || \
defined(CONFIG_R8A7740)
#define SCBRR_VALUE(bps, clk) (((clk*2)+16*bps)/(32*bps)-1)
#elif defined(CONFIG_CPU_SH7723)
static inline int scbrr_calc(struct uart_port *port, int bps, int clk)
{
if (port->type == PORT_SCIF)
return (clk+16*bps)/(32*bps)-1;
else
return ((clk*2)+16*bps)/(16*bps)-1;
}
#define SCBRR_VALUE(bps, clk) scbrr_calc(port, bps, clk)
#elif defined(CONFIG_RCAR_GEN2)
#define DL_VALUE(bps, clk) (clk / bps / 16) /* External Clock */
#if defined(CFG_SCIF_A)
#define SCBRR_VALUE(bps, clk) (clk / bps / 16 - 1) /* Internal Clock */
#else
#define SCBRR_VALUE(bps, clk) (clk / bps / 32 - 1) /* Internal Clock */
#endif
#else /* Generic SH */
#define SCBRR_VALUE(bps, clk) ((clk+16*bps)/(32*bps)-1)
#endif
#ifndef DL_VALUE
#define DL_VALUE(bps, clk) 0
#endif
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