arch/powerpc/boot/serial.c

   1 /*
   2  * Generic serial console support
   3  *
   4  * Author: Mark A. Greer <[email protected]>
   5  *
   6  * Code in serial_edit_cmdline() copied from <file:arch/ppc/boot/simple/misc.c>
   7  * and was written by Matt Porter <[email protected]>.
   8  *
   9  * 2001,2006 (c) MontaVista Software, Inc.  This file is licensed under
  10  * the terms of the GNU General Public License version 2.  This program
  11  * is licensed "as is" without any warranty of any kind, whether express
  12  * or implied.
  13  */
  14 #include <stdarg.h>
  15 #include <stddef.h>
  16 #include "types.h"
  17 #include "string.h"
  18 #include "stdio.h"
  19 #include "io.h"
  20 #include "ops.h"
  21 #include "autoconf.h"
  22
  23 static int serial_open(void)
  24 {
  25         struct serial_console_data *scdp = console_ops.data;
  26         return scdp->open();
  27 }
  28
  29 static void serial_write(const char *buf, int len)
  30 {
  31         struct serial_console_data *scdp = console_ops.data;
  32
  33         while (*buf != '\0')
  34                 scdp->putc(*buf++);
  35 }
  36
  37 static void serial_edit_cmdline(char *buf, int len, unsigned int timeout)
  38 {
  39         int timer = 0, count;
  40         char ch, *cp;
  41         struct serial_console_data *scdp = console_ops.data;
  42
  43         cp = buf;
  44         count = strlen(buf);
  45         cp = &buf[count];
  46         count++;
  47
  48         do {
  49                 if (scdp->tstc()) {
  50                         while (((ch = scdp->getc()) != '\n') && (ch != '\r')) {
  51                                 /* Test for backspace/delete */
  52                                 if ((ch == '\b') || (ch == '\177')) {
  53                                         if (cp != buf) {
  54                                                 cp--;
  55                                                 count--;
  56                                                 printf("\b \b");
  57                                         }
  58                                 /* Test for ^x/^u (and wipe the line) */
  59                                 } else if ((ch == '\030') || (ch == '\025')) {
  60                                         while (cp != buf) {
  61                                                 cp--;
  62                                                 count--;
  63                                                 printf("\b \b");
  64                                         }
  65                                 } else if (count < len) {
  66                                                 *cp++ = ch;
  67                                                 count++;
  68                                                 scdp->putc(ch);
  69                                 }
  70                         }
  71                         break;  /* Exit 'timer' loop */
  72                 }
  73                 udelay(1000);  /* 1 msec */
  74         } while (timer++ < timeout);
  75         *cp = 0;
  76 }
  77
  78 static void serial_close(void)
  79 {
  80         struct serial_console_data *scdp = console_ops.data;
  81
  82         if (scdp->close)
  83                 scdp->close();
  84 }
  85
  86 static void *serial_get_stdout_devp(void)
  87 {
  88         void *devp;
  89         char devtype[MAX_PROP_LEN];
  90         char path[MAX_PATH_LEN];
  91
  92         devp = finddevice("/chosen");
  93         if (devp == NULL)
  94                 goto err_out;
  95
  96         if (getprop(devp, "linux,stdout-path", path, MAX_PATH_LEN) > 0 ||
  97                 getprop(devp, "stdout-path", path, MAX_PATH_LEN) > 0) {
  98                 devp = finddevice(path);
  99                 if (devp == NULL)
 100                         goto err_out;
 101
 102                 if ((getprop(devp, "device_type", devtype, sizeof(devtype)) > 0)
 103                                 && !strcmp(devtype, "serial"))
 104                         return devp;
 105         }
 106 err_out:
 107         return NULL;
 108 }
 109
 110 static struct serial_console_data serial_cd;
 111
 112 /* Node's "compatible" property determines which serial driver to use */
 113 int serial_console_init(void)
 114 {
 115         void *devp;
 116         int rc = -1;
 117
 118         devp = serial_get_stdout_devp();
 119         if (devp == NULL)
 120                 goto err_out;
 121
 122         if (dt_is_compatible(devp, "ns16550") ||
 123             dt_is_compatible(devp, "pnpPNP,501"))
 124                 rc = ns16550_console_init(devp, &serial_cd);
 125 #ifdef CONFIG_CPM
 126         else if (dt_is_compatible(devp, "fsl,cpm1-scc-uart") ||
 127                  dt_is_compatible(devp, "fsl,cpm1-smc-uart") ||
 128                  dt_is_compatible(devp, "fsl,cpm2-scc-uart") ||
 129                  dt_is_compatible(devp, "fsl,cpm2-smc-uart"))
 130                 rc = cpm_console_init(devp, &serial_cd);
 131 #endif
 132 #ifdef CONFIG_PPC_MPC52XX
 133         else if (dt_is_compatible(devp, "fsl,mpc5200-psc-uart"))
 134                 rc = mpc5200_psc_console_init(devp, &serial_cd);
 135 #endif
 136 #ifdef CONFIG_XILINX_VIRTEX
 137         else if (dt_is_compatible(devp, "xlnx,opb-uartlite-1.00.b") ||
 138                  dt_is_compatible(devp, "xlnx,xps-uartlite-1.00.a"))
 139                 rc = uartlite_console_init(devp, &serial_cd);
 140 #endif
 141 #ifdef CONFIG_PPC64_BOOT_WRAPPER
 142         else if (dt_is_compatible(devp, "ibm,opal-console-raw"))
 143                 rc = opal_console_init(devp, &serial_cd);
 144 #endif
 145
 146         /* Add other serial console driver calls here */
 147
 148         if (!rc) {
 149                 console_ops.open = serial_open;
 150                 console_ops.write = serial_write;
 151                 console_ops.close = serial_close;
 152                 console_ops.data = &serial_cd;
 153
 154                 if (serial_cd.getc)
 155                         console_ops.edit_cmdline = serial_edit_cmdline;
 156
 157                 return 0;
 158         }
 159 err_out:
 160         return -1;
 161 }