1 /* 2 * SuperH SCIF device driver. 3 * Copyright (c) 2007,2008 Nobuhiro Iwamatsu 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20 #include <common.h> 21 #include <asm/processor.h> 22 23 #if defined(CONFIG_CONS_SCIF0) 24 # define SCIF_BASE SCIF0_BASE 25 #elif defined(CONFIG_CONS_SCIF1) 26 # define SCIF_BASE SCIF1_BASE 27 #elif defined(CONFIG_CONS_SCIF2) 28 # define SCIF_BASE SCIF2_BASE 29 #elif defined(CONFIG_CONS_SCIF3) 30 # define SCIF_BASE SCIF3_BASE 31 #elif defined(CONFIG_CONS_SCIF4) 32 # define SCIF_BASE SCIF4_BASE 33 #elif defined(CONFIG_CONS_SCIF5) 34 # define SCIF_BASE SCIF5_BASE 35 #else 36 # error "Default SCIF doesn't set....." 37 #endif 38 39 /* Base register */ 40 #define SCSMR (vu_short *)(SCIF_BASE + 0x0) 41 #define SCBRR (vu_char *)(SCIF_BASE + 0x4) 42 #define SCSCR (vu_short *)(SCIF_BASE + 0x8) 43 #define SCFCR (vu_short *)(SCIF_BASE + 0x18) 44 #define SCFDR (vu_short *)(SCIF_BASE + 0x1C) 45 #if defined(CONFIG_CPU_SH7720) || \ 46 (defined(CONFIG_CPU_SH7723) && defined(CONFIG_SCIF_A)) 47 # define SCFSR (vu_short *)(SCIF_BASE + 0x14) /* SCSSR */ 48 # define SCFTDR (vu_char *)(SCIF_BASE + 0x20) 49 # define SCFRDR (vu_char *)(SCIF_BASE + 0x24) 50 #else 51 # define SCFTDR (vu_char *)(SCIF_BASE + 0xC) 52 # define SCFSR (vu_short *)(SCIF_BASE + 0x10) 53 # define SCFRDR (vu_char *)(SCIF_BASE + 0x14) 54 #endif 55 56 #if defined(CONFIG_CPU_SH7780) || \ 57 defined(CONFIG_CPU_SH7785) 58 # define SCRFDR (vu_short *)(SCIF_BASE + 0x20) 59 # define SCSPTR (vu_short *)(SCIF_BASE + 0x24) 60 # define SCLSR (vu_short *)(SCIF_BASE + 0x28) 61 # define SCRER (vu_short *)(SCIF_BASE + 0x2C) 62 # define LSR_ORER 1 63 # define FIFOLEVEL_MASK 0xFF 64 #elif defined(CONFIG_CPU_SH7763) 65 # if defined(CONFIG_CONS_SCIF2) 66 # define SCSPTR (vu_short *)(SCIF_BASE + 0x20) 67 # define SCLSR (vu_short *)(SCIF_BASE + 0x24) 68 # define LSR_ORER 1 69 # define FIFOLEVEL_MASK 0x1F 70 # else 71 # define SCRFDR (vu_short *)(SCIF_BASE + 0x20) 72 # define SCSPTR (vu_short *)(SCIF_BASE + 0x24) 73 # define SCLSR (vu_short *)(SCIF_BASE + 0x28) 74 # define SCRER (vu_short *)(SCIF_BASE + 0x2C) 75 # define LSR_ORER 1 76 # define FIFOLEVEL_MASK 0xFF 77 # endif 78 #elif defined(CONFIG_CPU_SH7723) 79 # if defined(CONFIG_SCIF_A) 80 # define SCLSR SCFSR 81 # define LSR_ORER 0x0200 82 # define FIFOLEVEL_MASK 0x3F 83 #else 84 # define SCLSR (vu_short *)(SCIF_BASE + 0x24) 85 # define LSR_ORER 1 86 # define FIFOLEVEL_MASK 0x1F 87 #endif 88 #elif defined(CONFIG_CPU_SH7750) || \ 89 defined(CONFIG_CPU_SH7751) || \ 90 defined(CONFIG_CPU_SH7722) || \ 91 defined(CONFIG_CPU_SH7203) 92 # define SCSPTR (vu_short *)(SCIF_BASE + 0x20) 93 # define SCLSR (vu_short *)(SCIF_BASE + 0x24) 94 # define LSR_ORER 1 95 # define FIFOLEVEL_MASK 0x1F 96 #elif defined(CONFIG_CPU_SH7720) 97 # define SCLSR (vu_short *)(SCIF_BASE + 0x24) 98 # define LSR_ORER 0x0200 99 # define FIFOLEVEL_MASK 0x1F 100 #elif defined(CONFIG_CPU_SH7710) || \ 101 defined(CONFIG_CPU_SH7712) 102 # define SCLSR SCFSR /* SCSSR */ 103 # define LSR_ORER 1 104 # define FIFOLEVEL_MASK 0x1F 105 #endif 106 107 /* SCBRR register value setting */ 108 #if defined(CONFIG_CPU_SH7720) 109 # define SCBRR_VALUE(bps, clk) (((clk*2)+16*bps)/(32*bps)-1) 110 #elif defined(CONFIG_CPU_SH7723) && defined(CONFIG_SCIF_A) 111 /* SH7723 SCIFA use bus clock. So clock *2 */ 112 # define SCBRR_VALUE(bps, clk) (((clk*2*2)+16*bps)/(32*bps)-1) 113 #else /* Generic SuperH */ 114 # define SCBRR_VALUE(bps, clk) ((clk+16*bps)/(32*bps)-1) 115 #endif 116 117 #define SCR_RE (1 << 4) 118 #define SCR_TE (1 << 5) 119 #define FCR_RFRST (1 << 1) /* RFCL */ 120 #define FCR_TFRST (1 << 2) /* TFCL */ 121 #define FSR_DR (1 << 0) 122 #define FSR_RDF (1 << 1) 123 #define FSR_FER (1 << 3) 124 #define FSR_BRK (1 << 4) 125 #define FSR_FER (1 << 3) 126 #define FSR_TEND (1 << 6) 127 #define FSR_ER (1 << 7) 128 129 /*----------------------------------------------------------------------*/ 130 131 void serial_setbrg(void) 132 { 133 DECLARE_GLOBAL_DATA_PTR; 134 *SCBRR = SCBRR_VALUE(gd->baudrate, CONFIG_SYS_CLK_FREQ); 135 } 136 137 int serial_init(void) 138 { 139 *SCSCR = (SCR_RE | SCR_TE); 140 *SCSMR = 0; 141 *SCSMR = 0; 142 *SCFCR = (FCR_RFRST | FCR_TFRST); 143 *SCFCR; 144 *SCFCR = 0; 145 146 serial_setbrg(); 147 return 0; 148 } 149 150 static int serial_rx_fifo_level(void) 151 { 152 #if defined(SCRFDR) 153 return (*SCRFDR >> 0) & FIFOLEVEL_MASK; 154 #else 155 return (*SCFDR >> 0) & FIFOLEVEL_MASK; 156 #endif 157 } 158 159 void serial_raw_putc(const char c) 160 { 161 unsigned int fsr_bits_to_clear; 162 163 while (1) { 164 if (*SCFSR & FSR_TEND) { /* Tx fifo is empty */ 165 fsr_bits_to_clear = FSR_TEND; 166 break; 167 } 168 } 169 170 *SCFTDR = c; 171 if (fsr_bits_to_clear != 0) 172 *SCFSR &= ~fsr_bits_to_clear; 173 } 174 175 void serial_putc(const char c) 176 { 177 if (c == '\n') 178 serial_raw_putc('\r'); 179 serial_raw_putc(c); 180 } 181 182 void serial_puts(const char *s) 183 { 184 char c; 185 while ((c = *s++) != 0) 186 serial_putc(c); 187 } 188 189 int serial_tstc(void) 190 { 191 return serial_rx_fifo_level() ? 1 : 0; 192 } 193 194 #define FSR_ERR_CLEAR 0x0063 195 #define RDRF_CLEAR 0x00fc 196 void handle_error(void) 197 { 198 199 (void)*SCFSR; 200 *SCFSR = FSR_ERR_CLEAR; 201 (void)*SCLSR; 202 *SCLSR = 0x00; 203 } 204 205 int serial_getc_check(void) 206 { 207 unsigned short status; 208 209 status = *SCFSR; 210 211 if (status & (FSR_FER | FSR_ER | FSR_BRK)) 212 handle_error(); 213 if (*SCLSR & LSR_ORER) 214 handle_error(); 215 return status & (FSR_DR | FSR_RDF); 216 } 217 218 int serial_getc(void) 219 { 220 unsigned short status; 221 char ch; 222 223 while (!serial_getc_check()) 224 ; 225 226 ch = *SCFRDR; 227 status = *SCFSR; 228 229 *SCFSR = RDRF_CLEAR; 230 231 if (status & (FSR_FER | FSR_FER | FSR_ER | FSR_BRK)) 232 handle_error(); 233 234 if (*SCLSR & LSR_ORER) 235 handle_error(); 236 237 return ch; 238 } 239