/* * SuperH SCIF device driver. * Copyright (c) 2007,2008 Nobuhiro Iwamatsu * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <common.h> #include <asm/io.h> #include <asm/processor.h> #if defined(CONFIG_CONS_SCIF0) # define SCIF_BASE SCIF0_BASE #elif defined(CONFIG_CONS_SCIF1) # define SCIF_BASE SCIF1_BASE #elif defined(CONFIG_CONS_SCIF2) # define SCIF_BASE SCIF2_BASE #elif defined(CONFIG_CONS_SCIF3) # define SCIF_BASE SCIF3_BASE #elif defined(CONFIG_CONS_SCIF4) # define SCIF_BASE SCIF4_BASE #elif defined(CONFIG_CONS_SCIF5) # define SCIF_BASE SCIF5_BASE #else # error "Default SCIF doesn't set....." #endif /* Base register */ #define SCSMR (vu_short *)(SCIF_BASE + 0x0) #define SCBRR (vu_char *)(SCIF_BASE + 0x4) #define SCSCR (vu_short *)(SCIF_BASE + 0x8) #define SCFCR (vu_short *)(SCIF_BASE + 0x18) #define SCFDR (vu_short *)(SCIF_BASE + 0x1C) #if defined(CONFIG_CPU_SH7720) || \ (defined(CONFIG_CPU_SH7723) && defined(CONFIG_SCIF_A)) # define SCFSR (vu_short *)(SCIF_BASE + 0x14) /* SCSSR */ # define SCFTDR (vu_char *)(SCIF_BASE + 0x20) # define SCFRDR (vu_char *)(SCIF_BASE + 0x24) #else # define SCFTDR (vu_char *)(SCIF_BASE + 0xC) # define SCFSR (vu_short *)(SCIF_BASE + 0x10) # define SCFRDR (vu_char *)(SCIF_BASE + 0x14) #endif #if defined(CONFIG_CPU_SH7780) || \ defined(CONFIG_CPU_SH7785) # define SCRFDR (vu_short *)(SCIF_BASE + 0x20) # define SCSPTR (vu_short *)(SCIF_BASE + 0x24) # define SCLSR (vu_short *)(SCIF_BASE + 0x28) # define SCRER (vu_short *)(SCIF_BASE + 0x2C) # define LSR_ORER 1 # define FIFOLEVEL_MASK 0xFF #elif defined(CONFIG_CPU_SH7763) # if defined(CONFIG_CONS_SCIF2) # define SCSPTR (vu_short *)(SCIF_BASE + 0x20) # define SCLSR (vu_short *)(SCIF_BASE + 0x24) # define LSR_ORER 1 # define FIFOLEVEL_MASK 0x1F # else # define SCRFDR (vu_short *)(SCIF_BASE + 0x20) # define SCSPTR (vu_short *)(SCIF_BASE + 0x24) # define SCLSR (vu_short *)(SCIF_BASE + 0x28) # define SCRER (vu_short *)(SCIF_BASE + 0x2C) # define LSR_ORER 1 # define FIFOLEVEL_MASK 0xFF # endif #elif defined(CONFIG_CPU_SH7723) # if defined(CONFIG_SCIF_A) # define SCLSR SCFSR # define LSR_ORER 0x0200 # define FIFOLEVEL_MASK 0x3F #else # define SCLSR (vu_short *)(SCIF_BASE + 0x24) # define LSR_ORER 1 # define FIFOLEVEL_MASK 0x1F #endif #elif defined(CONFIG_CPU_SH7750) || \ defined(CONFIG_CPU_SH7751) || \ defined(CONFIG_CPU_SH7722) || \ defined(CONFIG_CPU_SH7203) # define SCSPTR (vu_short *)(SCIF_BASE + 0x20) # define SCLSR (vu_short *)(SCIF_BASE + 0x24) # define LSR_ORER 1 # define FIFOLEVEL_MASK 0x1F #elif defined(CONFIG_CPU_SH7720) # define SCLSR SCFSR # define LSR_ORER 0x0200 # define FIFOLEVEL_MASK 0x1F #elif defined(CONFIG_CPU_SH7710) || \ defined(CONFIG_CPU_SH7712) # define SCLSR SCFSR /* SCSSR */ # define LSR_ORER 1 # define FIFOLEVEL_MASK 0x1F #endif /* SCBRR register value setting */ #if defined(CONFIG_CPU_SH7720) # define SCBRR_VALUE(bps, clk) (((clk * 2) + 16 * bps) / (32 * bps) - 1) #elif defined(CONFIG_CPU_SH7723) && defined(CONFIG_SCIF_A) /* SH7723 SCIFA use bus clock. So clock *2 */ # define SCBRR_VALUE(bps, clk) (((clk * 2 * 2) + 16 * bps) / (32 * bps) - 1) #else /* Generic SuperH */ # define SCBRR_VALUE(bps, clk) ((clk + 16 * bps) / (32 * bps) - 1) #endif #define SCR_RE (1 << 4) #define SCR_TE (1 << 5) #define FCR_RFRST (1 << 1) /* RFCL */ #define FCR_TFRST (1 << 2) /* TFCL */ #define FSR_DR (1 << 0) #define FSR_RDF (1 << 1) #define FSR_FER (1 << 3) #define FSR_BRK (1 << 4) #define FSR_FER (1 << 3) #define FSR_TEND (1 << 6) #define FSR_ER (1 << 7) /*----------------------------------------------------------------------*/ void serial_setbrg(void) { DECLARE_GLOBAL_DATA_PTR; writeb(SCBRR_VALUE(gd->baudrate, CONFIG_SYS_CLK_FREQ), SCBRR); } int serial_init(void) { writew((SCR_RE | SCR_TE), SCSCR); writew(0, SCSMR); writew(0, SCSMR); writew((FCR_RFRST | FCR_TFRST), SCFCR); readw(SCFCR); writew(0, SCFCR); serial_setbrg(); return 0; } static int serial_rx_fifo_level(void) { #if defined(SCRFDR) return (readw(SCRFDR) >> 0) & FIFOLEVEL_MASK; #else return (readw(SCFDR) >> 0) & FIFOLEVEL_MASK; #endif } void serial_raw_putc(const char c) { unsigned int fsr_bits_to_clear; while (1) { if (readw(SCFSR) & FSR_TEND) { /* Tx fifo is empty */ fsr_bits_to_clear = FSR_TEND; break; } } writeb(c, SCFTDR); if (fsr_bits_to_clear != 0) writew(readw(SCFSR) & ~fsr_bits_to_clear, SCFSR); } void serial_putc(const char c) { if (c == '\n') serial_raw_putc('\r'); serial_raw_putc(c); } void serial_puts(const char *s) { char c; while ((c = *s++) != 0) serial_putc(c); } int serial_tstc(void) { return serial_rx_fifo_level() ? 1 : 0; } #define FSR_ERR_CLEAR 0x0063 #define RDRF_CLEAR 0x00fc void handle_error(void) { readw(SCFSR); writew(FSR_ERR_CLEAR, SCFSR); readw(SCLSR); writew(0x00, SCLSR); } int serial_getc_check(void) { unsigned short status; status = readw(SCFSR); if (status & (FSR_FER | FSR_ER | FSR_BRK)) handle_error(); if (readw(SCLSR) & LSR_ORER) handle_error(); return status & (FSR_DR | FSR_RDF); } int serial_getc(void) { unsigned short status; char ch; while (!serial_getc_check()) ; ch = readb(SCFRDR); status = readw(SCFSR); writew(RDRF_CLEAR, SCFSR); if (status & (FSR_FER | FSR_FER | FSR_ER | FSR_BRK)) handle_error(); if (readw(SCLSR) & LSR_ORER) handle_error(); return ch; }