1 /* 2 * Generic serial console support 3 * 4 * Author: Mark A. Greer <mgreer@mvista.com> 5 * 6 * Code in serial_edit_cmdline() copied from <file:arch/ppc/boot/simple/misc.c> 7 * and was written by Matt Porter <mporter@kernel.crashing.org>. 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 22 static int serial_open(void) 23 { 24 struct serial_console_data *scdp = console_ops.data; 25 return scdp->open(); 26 } 27 28 static void serial_write(const char *buf, int len) 29 { 30 struct serial_console_data *scdp = console_ops.data; 31 32 while (*buf != '\0') 33 scdp->putc(*buf++); 34 } 35 36 static void serial_edit_cmdline(char *buf, int len, unsigned int timeout) 37 { 38 int timer = 0, count; 39 char ch, *cp; 40 struct serial_console_data *scdp = console_ops.data; 41 42 cp = buf; 43 count = strlen(buf); 44 cp = &buf[count]; 45 count++; 46 47 do { 48 if (scdp->tstc()) { 49 while (((ch = scdp->getc()) != '\n') && (ch != '\r')) { 50 /* Test for backspace/delete */ 51 if ((ch == '\b') || (ch == '\177')) { 52 if (cp != buf) { 53 cp--; 54 count--; 55 printf("\b \b"); 56 } 57 /* Test for ^x/^u (and wipe the line) */ 58 } else if ((ch == '\030') || (ch == '\025')) { 59 while (cp != buf) { 60 cp--; 61 count--; 62 printf("\b \b"); 63 } 64 } else if (count < len) { 65 *cp++ = ch; 66 count++; 67 scdp->putc(ch); 68 } 69 } 70 break; /* Exit 'timer' loop */ 71 } 72 udelay(1000); /* 1 msec */ 73 } while (timer++ < timeout); 74 *cp = 0; 75 } 76 77 static void serial_close(void) 78 { 79 struct serial_console_data *scdp = console_ops.data; 80 81 if (scdp->close) 82 scdp->close(); 83 } 84 85 static void *serial_get_stdout_devp(void) 86 { 87 void *devp; 88 char devtype[MAX_PROP_LEN]; 89 char path[MAX_PATH_LEN]; 90 91 devp = finddevice("/chosen"); 92 if (devp == NULL) 93 goto err_out; 94 95 if (getprop(devp, "linux,stdout-path", path, MAX_PATH_LEN) > 0 || 96 getprop(devp, "stdout-path", path, MAX_PATH_LEN) > 0) { 97 devp = finddevice(path); 98 if (devp == NULL) 99 goto err_out; 100 101 if ((getprop(devp, "device_type", devtype, sizeof(devtype)) > 0) 102 && !strcmp(devtype, "serial")) 103 return devp; 104 } 105 err_out: 106 return NULL; 107 } 108 109 static struct serial_console_data serial_cd; 110 111 /* Node's "compatible" property determines which serial driver to use */ 112 int serial_console_init(void) 113 { 114 void *devp; 115 int rc = -1; 116 117 devp = serial_get_stdout_devp(); 118 if (devp == NULL) 119 goto err_out; 120 121 if (dt_is_compatible(devp, "ns16550") || 122 dt_is_compatible(devp, "pnpPNP,501")) 123 rc = ns16550_console_init(devp, &serial_cd); 124 #ifdef CONFIG_CPM 125 else if (dt_is_compatible(devp, "fsl,cpm1-scc-uart") || 126 dt_is_compatible(devp, "fsl,cpm1-smc-uart") || 127 dt_is_compatible(devp, "fsl,cpm2-scc-uart") || 128 dt_is_compatible(devp, "fsl,cpm2-smc-uart")) 129 rc = cpm_console_init(devp, &serial_cd); 130 #endif 131 #ifdef CONFIG_PPC_MPC52xx 132 else if (dt_is_compatible(devp, "fsl,mpc5200-psc-uart")) 133 rc = mpc5200_psc_console_init(devp, &serial_cd); 134 #endif 135 #ifdef CONFIG_PPC_POWERNV 136 else if (dt_is_compatible(devp, "ibm,opal-console-raw")) 137 rc = opal_console_init(devp, &serial_cd); 138 #endif 139 140 /* Add other serial console driver calls here */ 141 142 if (!rc) { 143 console_ops.open = serial_open; 144 console_ops.write = serial_write; 145 console_ops.close = serial_close; 146 console_ops.data = &serial_cd; 147 148 if (serial_cd.getc) 149 console_ops.edit_cmdline = serial_edit_cmdline; 150 151 return 0; 152 } 153 err_out: 154 return -1; 155 } 156