arch/ppc/cpu/mpc5xxx/serial.c

   1 /*
   2  * (C) Copyright 2000 - 2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  *
  23  * Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00, with
  24  * changes based on the file arch/ppc/mbxboot/m8260_tty.c from the
  25  * Linux/PPC sources (m8260_tty.c had no copyright info in it).
  26  *
  27  * Martin Krause, 8 Jun 2006
  28  * Added CONFIG_SERIAL_MULTI support
  29  */
  30
  31 /*
  32  * Minimal serial functions needed to use one of the PSC ports
  33  * as serial console interface.
  34  */
  35
  36 #include <common.h>
  37 #include <mpc5xxx.h>
  38
  39 #if defined (CONFIG_SERIAL_MULTI)
  40 #include <serial.h>
  41 #endif
  42
  43 DECLARE_GLOBAL_DATA_PTR;
  44
  45 #if defined(CONFIG_PSC_CONSOLE)
  46
  47 #if CONFIG_PSC_CONSOLE == 1
  48 #define PSC_BASE MPC5XXX_PSC1
  49 #elif CONFIG_PSC_CONSOLE == 2
  50 #define PSC_BASE MPC5XXX_PSC2
  51 #elif CONFIG_PSC_CONSOLE == 3
  52 #define PSC_BASE MPC5XXX_PSC3
  53 #elif CONFIG_PSC_CONSOLE == 4
  54 #define PSC_BASE MPC5XXX_PSC4
  55 #elif CONFIG_PSC_CONSOLE == 5
  56 #define PSC_BASE MPC5XXX_PSC5
  57 #elif CONFIG_PSC_CONSOLE == 6
  58 #define PSC_BASE MPC5XXX_PSC6
  59 #else
  60 #error CONFIG_PSC_CONSOLE must be in 1 ... 6
  61 #endif
  62
  63 #if defined(CONFIG_SERIAL_MULTI) && !defined(CONFIG_PSC_CONSOLE2)
  64 #error you must define CONFIG_PSC_CONSOLE2 if CONFIG_SERIAL_MULTI is set
  65 #endif
  66
  67 #if defined(CONFIG_SERIAL_MULTI)
  68 #if CONFIG_PSC_CONSOLE2 == 1
  69 #define PSC_BASE2 MPC5XXX_PSC1
  70 #elif CONFIG_PSC_CONSOLE2 == 2
  71 #define PSC_BASE2 MPC5XXX_PSC2
  72 #elif CONFIG_PSC_CONSOLE2 == 3
  73 #define PSC_BASE2 MPC5XXX_PSC3
  74 #elif CONFIG_PSC_CONSOLE2 == 4
  75 #define PSC_BASE2 MPC5XXX_PSC4
  76 #elif CONFIG_PSC_CONSOLE2 == 5
  77 #define PSC_BASE2 MPC5XXX_PSC5
  78 #elif CONFIG_PSC_CONSOLE2 == 6
  79 #define PSC_BASE2 MPC5XXX_PSC6
  80 #else
  81 #error CONFIG_PSC_CONSOLE2 must be in 1 ... 6
  82 #endif
  83 #endif /* CONFIG_SERIAL_MULTI */
  84
  85 #if defined(CONFIG_SERIAL_MULTI)
  86 int serial_init_dev (unsigned long dev_base)
  87 #else
  88 int serial_init (void)
  89 #endif
  90 {
  91 #if defined(CONFIG_SERIAL_MULTI)
  92         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
  93 #else
  94         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
  95 #endif
  96         unsigned long baseclk;
  97         int div;
  98
  99         /* reset PSC */
 100         psc->command = PSC_SEL_MODE_REG_1;
 101
 102         /* select clock sources */
 103         psc->psc_clock_select = 0;
 104         baseclk = (gd->ipb_clk + 16) / 32;
 105
 106         /* switch to UART mode */
 107         psc->sicr = 0;
 108
 109         /* configure parity, bit length and so on */
 110         psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE;
 111         psc->mode = PSC_MODE_ONE_STOP;
 112
 113         /* set up UART divisor */
 114         div = (baseclk + (gd->baudrate/2)) / gd->baudrate;
 115         psc->ctur = (div >> 8) & 0xff;
 116         psc->ctlr = div & 0xff;
 117
 118         /* disable all interrupts */
 119         psc->psc_imr = 0;
 120
 121         /* reset and enable Rx/Tx */
 122         psc->command = PSC_RST_RX;
 123         psc->command = PSC_RST_TX;
 124         psc->command = PSC_RX_ENABLE | PSC_TX_ENABLE;
 125
 126         return (0);
 127 }
 128
 129 #if defined(CONFIG_SERIAL_MULTI)
 130 void serial_putc_dev (unsigned long dev_base, const char c)
 131 #else
 132 void serial_putc(const char c)
 133 #endif
 134 {
 135 #if defined(CONFIG_SERIAL_MULTI)
 136         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
 137 #else
 138         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
 139 #endif
 140
 141         if (c == '\n')
 142 #if defined(CONFIG_SERIAL_MULTI)
 143                 serial_putc_dev (dev_base, '\r');
 144 #else
 145                 serial_putc('\r');
 146 #endif
 147
 148         /* Wait for last character to go. */
 149         while (!(psc->psc_status & PSC_SR_TXEMP))
 150                 ;
 151
 152         psc->psc_buffer_8 = c;
 153 }
 154
 155 #if defined(CONFIG_SERIAL_MULTI)
 156 void serial_putc_raw_dev(unsigned long dev_base, const char c)
 157 #else
 158 void serial_putc_raw(const char c)
 159 #endif
 160 {
 161 #if defined(CONFIG_SERIAL_MULTI)
 162         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
 163 #else
 164         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
 165 #endif
 166         /* Wait for last character to go. */
 167         while (!(psc->psc_status & PSC_SR_TXEMP))
 168                 ;
 169
 170         psc->psc_buffer_8 = c;
 171 }
 172
 173
 174 #if defined(CONFIG_SERIAL_MULTI)
 175 void serial_puts_dev (unsigned long dev_base, const char *s)
 176 #else
 177 void serial_puts (const char *s)
 178 #endif
 179 {
 180         while (*s) {
 181 #if defined(CONFIG_SERIAL_MULTI)
 182                 serial_putc_dev (dev_base, *s++);
 183 #else
 184                 serial_putc (*s++);
 185 #endif
 186         }
 187 }
 188
 189 #if defined(CONFIG_SERIAL_MULTI)
 190 int serial_getc_dev (unsigned long dev_base)
 191 #else
 192 int serial_getc(void)
 193 #endif
 194 {
 195 #if defined(CONFIG_SERIAL_MULTI)
 196         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
 197 #else
 198         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
 199 #endif
 200
 201         /* Wait for a character to arrive. */
 202         while (!(psc->psc_status & PSC_SR_RXRDY))
 203                 ;
 204
 205         return psc->psc_buffer_8;
 206 }
 207
 208 #if defined(CONFIG_SERIAL_MULTI)
 209 int serial_tstc_dev (unsigned long dev_base)
 210 #else
 211 int serial_tstc(void)
 212 #endif
 213 {
 214 #if defined(CONFIG_SERIAL_MULTI)
 215         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
 216 #else
 217         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
 218 #endif
 219
 220         return (psc->psc_status & PSC_SR_RXRDY);
 221 }
 222
 223 #if defined(CONFIG_SERIAL_MULTI)
 224 void serial_setbrg_dev (unsigned long dev_base)
 225 #else
 226 void serial_setbrg(void)
 227 #endif
 228 {
 229 #if defined(CONFIG_SERIAL_MULTI)
 230         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
 231 #else
 232         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
 233 #endif
 234         unsigned long baseclk, div;
 235
 236         baseclk = (gd->ipb_clk + 16) / 32;
 237
 238         /* set up UART divisor */
 239         div = (baseclk + (gd->baudrate/2)) / gd->baudrate;
 240         psc->ctur = (div >> 8) & 0xFF;
 241         psc->ctlr =  div & 0xff;
 242 }
 243
 244 #if defined(CONFIG_SERIAL_MULTI)
 245 void serial_setrts_dev (unsigned long dev_base, int s)
 246 #else
 247 void serial_setrts(int s)
 248 #endif
 249 {
 250 #if defined(CONFIG_SERIAL_MULTI)
 251         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
 252 #else
 253         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
 254 #endif
 255
 256         if (s) {
 257                 /* Assert RTS (become LOW) */
 258                 psc->op1 = 0x1;
 259         }
 260         else {
 261                 /* Negate RTS (become HIGH) */
 262                 psc->op0 = 0x1;
 263         }
 264 }
 265
 266 #if defined(CONFIG_SERIAL_MULTI)
 267 int serial_getcts_dev (unsigned long dev_base)
 268 #else
 269 int serial_getcts(void)
 270 #endif
 271 {
 272 #if defined(CONFIG_SERIAL_MULTI)
 273         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
 274 #else
 275         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
 276 #endif
 277
 278         return (psc->ip & 0x1) ? 0 : 1;
 279 }
 280
 281 #if defined(CONFIG_SERIAL_MULTI)
 282 int serial0_init(void)
 283 {
 284         return (serial_init_dev(PSC_BASE));
 285 }
 286
 287 int serial1_init(void)
 288 {
 289         return (serial_init_dev(PSC_BASE2));
 290 }
 291 void serial0_setbrg (void)
 292 {
 293         serial_setbrg_dev(PSC_BASE);
 294 }
 295 void serial1_setbrg (void)
 296 {
 297         serial_setbrg_dev(PSC_BASE2);
 298 }
 299
 300 void serial0_putc(const char c)
 301 {
 302         serial_putc_dev(PSC_BASE,c);
 303 }
 304
 305 void serial1_putc(const char c)
 306 {
 307         serial_putc_dev(PSC_BASE2, c);
 308 }
 309 void serial0_puts(const char *s)
 310 {
 311         serial_puts_dev(PSC_BASE, s);
 312 }
 313
 314 void serial1_puts(const char *s)
 315 {
 316         serial_puts_dev(PSC_BASE2, s);
 317 }
 318
 319 int serial0_getc(void)
 320 {
 321         return(serial_getc_dev(PSC_BASE));
 322 }
 323
 324 int serial1_getc(void)
 325 {
 326         return(serial_getc_dev(PSC_BASE2));
 327 }
 328 int serial0_tstc(void)
 329 {
 330         return (serial_tstc_dev(PSC_BASE));
 331 }
 332
 333 int serial1_tstc(void)
 334 {
 335         return (serial_tstc_dev(PSC_BASE2));
 336 }
 337
 338 struct serial_device serial0_device =
 339 {
 340         "serial0",
 341         "UART0",
 342         serial0_init,
 343         serial0_setbrg,
 344         serial0_getc,
 345         serial0_tstc,
 346         serial0_putc,
 347         serial0_puts,
 348 };
 349
 350 struct serial_device serial1_device =
 351 {
 352         "serial1",
 353         "UART1",
 354         serial1_init,
 355         serial1_setbrg,
 356         serial1_getc,
 357         serial1_tstc,
 358         serial1_putc,
 359         serial1_puts,
 360 };
 361 #endif /* CONFIG_SERIAL_MULTI */
 362
 363 #endif /* CONFIG_PSC_CONSOLE */