1 #include <linux/console.h> 2 #include <linux/kernel.h> 3 #include <linux/init.h> 4 #include <linux/string.h> 5 #include <linux/screen_info.h> 6 #include <linux/usb/ch9.h> 7 #include <linux/pci_regs.h> 8 #include <linux/pci_ids.h> 9 #include <linux/errno.h> 10 #include <asm/io.h> 11 #include <asm/processor.h> 12 #include <asm/fcntl.h> 13 #include <asm/setup.h> 14 #include <xen/hvc-console.h> 15 #include <asm/pci-direct.h> 16 #include <asm/fixmap.h> 17 #include <asm/intel-mid.h> 18 #include <asm/pgtable.h> 19 #include <linux/usb/ehci_def.h> 20 #include <linux/efi.h> 21 #include <asm/efi.h> 22 #include <asm/pci_x86.h> 23 24 /* Simple VGA output */ 25 #define VGABASE (__ISA_IO_base + 0xb8000) 26 27 static int max_ypos = 25, max_xpos = 80; 28 static int current_ypos = 25, current_xpos; 29 30 static void early_vga_write(struct console *con, const char *str, unsigned n) 31 { 32 char c; 33 int i, k, j; 34 35 while ((c = *str++) != '\0' && n-- > 0) { 36 if (current_ypos >= max_ypos) { 37 /* scroll 1 line up */ 38 for (k = 1, j = 0; k < max_ypos; k++, j++) { 39 for (i = 0; i < max_xpos; i++) { 40 writew(readw(VGABASE+2*(max_xpos*k+i)), 41 VGABASE + 2*(max_xpos*j + i)); 42 } 43 } 44 for (i = 0; i < max_xpos; i++) 45 writew(0x720, VGABASE + 2*(max_xpos*j + i)); 46 current_ypos = max_ypos-1; 47 } 48 #ifdef CONFIG_KGDB_KDB 49 if (c == '\b') { 50 if (current_xpos > 0) 51 current_xpos--; 52 } else if (c == '\r') { 53 current_xpos = 0; 54 } else 55 #endif 56 if (c == '\n') { 57 current_xpos = 0; 58 current_ypos++; 59 } else if (c != '\r') { 60 writew(((0x7 << 8) | (unsigned short) c), 61 VGABASE + 2*(max_xpos*current_ypos + 62 current_xpos++)); 63 if (current_xpos >= max_xpos) { 64 current_xpos = 0; 65 current_ypos++; 66 } 67 } 68 } 69 } 70 71 static struct console early_vga_console = { 72 .name = "earlyvga", 73 .write = early_vga_write, 74 .flags = CON_PRINTBUFFER, 75 .index = -1, 76 }; 77 78 /* Serial functions loosely based on a similar package from Klaus P. Gerlicher */ 79 80 static unsigned long early_serial_base = 0x3f8; /* ttyS0 */ 81 82 #define XMTRDY 0x20 83 84 #define DLAB 0x80 85 86 #define TXR 0 /* Transmit register (WRITE) */ 87 #define RXR 0 /* Receive register (READ) */ 88 #define IER 1 /* Interrupt Enable */ 89 #define IIR 2 /* Interrupt ID */ 90 #define FCR 2 /* FIFO control */ 91 #define LCR 3 /* Line control */ 92 #define MCR 4 /* Modem control */ 93 #define LSR 5 /* Line Status */ 94 #define MSR 6 /* Modem Status */ 95 #define DLL 0 /* Divisor Latch Low */ 96 #define DLH 1 /* Divisor latch High */ 97 98 static void mem32_serial_out(unsigned long addr, int offset, int value) 99 { 100 uint32_t *vaddr = (uint32_t *)addr; 101 /* shift implied by pointer type */ 102 writel(value, vaddr + offset); 103 } 104 105 static unsigned int mem32_serial_in(unsigned long addr, int offset) 106 { 107 uint32_t *vaddr = (uint32_t *)addr; 108 /* shift implied by pointer type */ 109 return readl(vaddr + offset); 110 } 111 112 static unsigned int io_serial_in(unsigned long addr, int offset) 113 { 114 return inb(addr + offset); 115 } 116 117 static void io_serial_out(unsigned long addr, int offset, int value) 118 { 119 outb(value, addr + offset); 120 } 121 122 static unsigned int (*serial_in)(unsigned long addr, int offset) = io_serial_in; 123 static void (*serial_out)(unsigned long addr, int offset, int value) = io_serial_out; 124 125 static int early_serial_putc(unsigned char ch) 126 { 127 unsigned timeout = 0xffff; 128 129 while ((serial_in(early_serial_base, LSR) & XMTRDY) == 0 && --timeout) 130 cpu_relax(); 131 serial_out(early_serial_base, TXR, ch); 132 return timeout ? 0 : -1; 133 } 134 135 static void early_serial_write(struct console *con, const char *s, unsigned n) 136 { 137 while (*s && n-- > 0) { 138 if (*s == '\n') 139 early_serial_putc('\r'); 140 early_serial_putc(*s); 141 s++; 142 } 143 } 144 145 static __init void early_serial_hw_init(unsigned divisor) 146 { 147 unsigned char c; 148 149 serial_out(early_serial_base, LCR, 0x3); /* 8n1 */ 150 serial_out(early_serial_base, IER, 0); /* no interrupt */ 151 serial_out(early_serial_base, FCR, 0); /* no fifo */ 152 serial_out(early_serial_base, MCR, 0x3); /* DTR + RTS */ 153 154 c = serial_in(early_serial_base, LCR); 155 serial_out(early_serial_base, LCR, c | DLAB); 156 serial_out(early_serial_base, DLL, divisor & 0xff); 157 serial_out(early_serial_base, DLH, (divisor >> 8) & 0xff); 158 serial_out(early_serial_base, LCR, c & ~DLAB); 159 } 160 161 #define DEFAULT_BAUD 9600 162 163 static __init void early_serial_init(char *s) 164 { 165 unsigned divisor; 166 unsigned long baud = DEFAULT_BAUD; 167 char *e; 168 169 if (*s == ',') 170 ++s; 171 172 if (*s) { 173 unsigned port; 174 if (!strncmp(s, "0x", 2)) { 175 early_serial_base = simple_strtoul(s, &e, 16); 176 } else { 177 static const int __initconst bases[] = { 0x3f8, 0x2f8 }; 178 179 if (!strncmp(s, "ttyS", 4)) 180 s += 4; 181 port = simple_strtoul(s, &e, 10); 182 if (port > 1 || s == e) 183 port = 0; 184 early_serial_base = bases[port]; 185 } 186 s += strcspn(s, ","); 187 if (*s == ',') 188 s++; 189 } 190 191 if (*s) { 192 if (kstrtoul(s, 0, &baud) < 0 || baud == 0) 193 baud = DEFAULT_BAUD; 194 } 195 196 /* Convert from baud to divisor value */ 197 divisor = 115200 / baud; 198 199 /* These will always be IO based ports */ 200 serial_in = io_serial_in; 201 serial_out = io_serial_out; 202 203 /* Set up the HW */ 204 early_serial_hw_init(divisor); 205 } 206 207 #ifdef CONFIG_PCI 208 /* 209 * early_pci_serial_init() 210 * 211 * This function is invoked when the early_printk param starts with "pciserial" 212 * The rest of the param should be ",B:D.F,baud" where B, D & F describe the 213 * location of a PCI device that must be a UART device. 214 */ 215 static __init void early_pci_serial_init(char *s) 216 { 217 unsigned divisor; 218 unsigned long baud = DEFAULT_BAUD; 219 u8 bus, slot, func; 220 uint32_t classcode, bar0; 221 uint16_t cmdreg; 222 char *e; 223 224 225 /* 226 * First, part the param to get the BDF values 227 */ 228 if (*s == ',') 229 ++s; 230 231 if (*s == 0) 232 return; 233 234 bus = (u8)simple_strtoul(s, &e, 16); 235 s = e; 236 if (*s != ':') 237 return; 238 ++s; 239 slot = (u8)simple_strtoul(s, &e, 16); 240 s = e; 241 if (*s != '.') 242 return; 243 ++s; 244 func = (u8)simple_strtoul(s, &e, 16); 245 s = e; 246 247 /* A baud might be following */ 248 if (*s == ',') 249 s++; 250 251 /* 252 * Second, find the device from the BDF 253 */ 254 cmdreg = read_pci_config(bus, slot, func, PCI_COMMAND); 255 classcode = read_pci_config(bus, slot, func, PCI_CLASS_REVISION); 256 bar0 = read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_0); 257 258 /* 259 * Verify it is a UART type device 260 */ 261 if (((classcode >> 16 != PCI_CLASS_COMMUNICATION_MODEM) && 262 (classcode >> 16 != PCI_CLASS_COMMUNICATION_SERIAL)) || 263 (((classcode >> 8) & 0xff) != 0x02)) /* 16550 I/F at BAR0 */ 264 return; 265 266 /* 267 * Determine if it is IO or memory mapped 268 */ 269 if (bar0 & 0x01) { 270 /* it is IO mapped */ 271 serial_in = io_serial_in; 272 serial_out = io_serial_out; 273 early_serial_base = bar0&0xfffffffc; 274 write_pci_config(bus, slot, func, PCI_COMMAND, 275 cmdreg|PCI_COMMAND_IO); 276 } else { 277 /* It is memory mapped - assume 32-bit alignment */ 278 serial_in = mem32_serial_in; 279 serial_out = mem32_serial_out; 280 /* WARNING! assuming the address is always in the first 4G */ 281 early_serial_base = 282 (unsigned long)early_ioremap(bar0 & 0xfffffff0, 0x10); 283 write_pci_config(bus, slot, func, PCI_COMMAND, 284 cmdreg|PCI_COMMAND_MEMORY); 285 } 286 287 /* 288 * Lastly, initalize the hardware 289 */ 290 if (*s) { 291 if (strcmp(s, "nocfg") == 0) 292 /* Sometimes, we want to leave the UART alone 293 * and assume the BIOS has set it up correctly. 294 * "nocfg" tells us this is the case, and we 295 * should do no more setup. 296 */ 297 return; 298 if (kstrtoul(s, 0, &baud) < 0 || baud == 0) 299 baud = DEFAULT_BAUD; 300 } 301 302 /* Convert from baud to divisor value */ 303 divisor = 115200 / baud; 304 305 /* Set up the HW */ 306 early_serial_hw_init(divisor); 307 } 308 #endif 309 310 static struct console early_serial_console = { 311 .name = "earlyser", 312 .write = early_serial_write, 313 .flags = CON_PRINTBUFFER, 314 .index = -1, 315 }; 316 317 static inline void early_console_register(struct console *con, int keep_early) 318 { 319 if (con->index != -1) { 320 printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n", 321 con->name); 322 return; 323 } 324 early_console = con; 325 if (keep_early) 326 early_console->flags &= ~CON_BOOT; 327 else 328 early_console->flags |= CON_BOOT; 329 register_console(early_console); 330 } 331 332 static int __init setup_early_printk(char *buf) 333 { 334 int keep; 335 336 if (!buf) 337 return 0; 338 339 if (early_console) 340 return 0; 341 342 keep = (strstr(buf, "keep") != NULL); 343 344 while (*buf != '\0') { 345 if (!strncmp(buf, "serial", 6)) { 346 buf += 6; 347 early_serial_init(buf); 348 early_console_register(&early_serial_console, keep); 349 if (!strncmp(buf, ",ttyS", 5)) 350 buf += 5; 351 } 352 if (!strncmp(buf, "ttyS", 4)) { 353 early_serial_init(buf + 4); 354 early_console_register(&early_serial_console, keep); 355 } 356 #ifdef CONFIG_PCI 357 if (!strncmp(buf, "pciserial", 9)) { 358 early_pci_serial_init(buf + 9); 359 early_console_register(&early_serial_console, keep); 360 buf += 9; /* Keep from match the above "serial" */ 361 } 362 #endif 363 if (!strncmp(buf, "vga", 3) && 364 boot_params.screen_info.orig_video_isVGA == 1) { 365 max_xpos = boot_params.screen_info.orig_video_cols; 366 max_ypos = boot_params.screen_info.orig_video_lines; 367 current_ypos = boot_params.screen_info.orig_y; 368 early_console_register(&early_vga_console, keep); 369 } 370 #ifdef CONFIG_EARLY_PRINTK_DBGP 371 if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4)) 372 early_console_register(&early_dbgp_console, keep); 373 #endif 374 #ifdef CONFIG_HVC_XEN 375 if (!strncmp(buf, "xen", 3)) 376 early_console_register(&xenboot_console, keep); 377 #endif 378 #ifdef CONFIG_EARLY_PRINTK_INTEL_MID 379 if (!strncmp(buf, "hsu", 3)) { 380 hsu_early_console_init(buf + 3); 381 early_console_register(&early_hsu_console, keep); 382 } 383 #endif 384 #ifdef CONFIG_EARLY_PRINTK_EFI 385 if (!strncmp(buf, "efi", 3)) 386 early_console_register(&early_efi_console, keep); 387 #endif 388 389 buf++; 390 } 391 return 0; 392 } 393 394 early_param("earlyprintk", setup_early_printk); 395