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 #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 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_XILINX_VIRTEX 136 else if (dt_is_compatible(devp, "xlnx,opb-uartlite-1.00.b") || 137 dt_is_compatible(devp, "xlnx,xps-uartlite-1.00.a")) 138 rc = uartlite_console_init(devp, &serial_cd); 139 #endif 140 #ifdef CONFIG_PPC64_BOOT_WRAPPER 141 else if (dt_is_compatible(devp, "ibm,opal-console-raw")) 142 rc = opal_console_init(devp, &serial_cd); 143 #endif 144 145 /* Add other serial console driver calls here */ 146 147 if (!rc) { 148 console_ops.open = serial_open; 149 console_ops.write = serial_write; 150 console_ops.close = serial_close; 151 console_ops.data = &serial_cd; 152 153 if (serial_cd.getc) 154 console_ops.edit_cmdline = serial_edit_cmdline; 155 156 return 0; 157 } 158 err_out: 159 return -1; 160 } 161