1 /* 2 * COM1 NS16550 support 3 * originally from linux source (arch/powerpc/boot/ns16550.c) 4 * modified to use CONFIG_SYS_ISA_MEM and new defines 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #include <errno.h> 10 #include <fdtdec.h> 11 #include <ns16550.h> 12 #include <serial.h> 13 #include <watchdog.h> 14 #include <linux/types.h> 15 #include <asm/io.h> 16 17 DECLARE_GLOBAL_DATA_PTR; 18 19 #define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */ 20 #define UART_MCRVAL (UART_MCR_DTR | \ 21 UART_MCR_RTS) /* RTS/DTR */ 22 #define UART_FCRVAL (UART_FCR_FIFO_EN | \ 23 UART_FCR_RXSR | \ 24 UART_FCR_TXSR) /* Clear & enable FIFOs */ 25 26 #ifndef CONFIG_DM_SERIAL 27 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED 28 #define serial_out(x, y) outb(x, (ulong)y) 29 #define serial_in(y) inb((ulong)y) 30 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0) 31 #define serial_out(x, y) out_be32(y, x) 32 #define serial_in(y) in_be32(y) 33 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0) 34 #define serial_out(x, y) out_le32(y, x) 35 #define serial_in(y) in_le32(y) 36 #else 37 #define serial_out(x, y) writeb(x, y) 38 #define serial_in(y) readb(y) 39 #endif 40 #endif /* !CONFIG_DM_SERIAL */ 41 42 #if defined(CONFIG_SOC_KEYSTONE) 43 #define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0 44 #define UART_REG_VAL_PWREMU_MGMT_UART_ENABLE ((1 << 14) | (1 << 13) | (1 << 0)) 45 #undef UART_MCRVAL 46 #ifdef CONFIG_SERIAL_HW_FLOW_CONTROL 47 #define UART_MCRVAL (UART_MCR_RTS | UART_MCR_AFE) 48 #else 49 #define UART_MCRVAL (UART_MCR_RTS) 50 #endif 51 #endif 52 53 #ifndef CONFIG_SYS_NS16550_IER 54 #define CONFIG_SYS_NS16550_IER 0x00 55 #endif /* CONFIG_SYS_NS16550_IER */ 56 57 static inline void serial_out_shift(void *addr, int shift, int value) 58 { 59 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED 60 outb(value, (ulong)addr); 61 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN) 62 out_le32(addr, value); 63 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN) 64 out_be32(addr, value); 65 #elif defined(CONFIG_SYS_NS16550_MEM32) 66 writel(value, addr); 67 #elif defined(CONFIG_SYS_BIG_ENDIAN) 68 writeb(value, addr + (1 << shift) - 1); 69 #else 70 writeb(value, addr); 71 #endif 72 } 73 74 static inline int serial_in_shift(void *addr, int shift) 75 { 76 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED 77 return inb((ulong)addr); 78 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN) 79 return in_le32(addr); 80 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN) 81 return in_be32(addr); 82 #elif defined(CONFIG_SYS_NS16550_MEM32) 83 return readl(addr); 84 #elif defined(CONFIG_SYS_BIG_ENDIAN) 85 return readb(addr + (1 << shift) - 1); 86 #else 87 return readb(addr); 88 #endif 89 } 90 91 #ifdef CONFIG_DM_SERIAL 92 93 #ifndef CONFIG_SYS_NS16550_CLK 94 #define CONFIG_SYS_NS16550_CLK 0 95 #endif 96 97 static void ns16550_writeb(NS16550_t port, int offset, int value) 98 { 99 struct ns16550_platdata *plat = port->plat; 100 unsigned char *addr; 101 102 offset *= 1 << plat->reg_shift; 103 addr = (unsigned char *)plat->base + offset; 104 105 /* 106 * As far as we know it doesn't make sense to support selection of 107 * these options at run-time, so use the existing CONFIG options. 108 */ 109 serial_out_shift(addr + plat->reg_offset, plat->reg_shift, value); 110 } 111 112 static int ns16550_readb(NS16550_t port, int offset) 113 { 114 struct ns16550_platdata *plat = port->plat; 115 unsigned char *addr; 116 117 offset *= 1 << plat->reg_shift; 118 addr = (unsigned char *)plat->base + offset; 119 120 return serial_in_shift(addr + plat->reg_offset, plat->reg_shift); 121 } 122 123 /* We can clean these up once everything is moved to driver model */ 124 #define serial_out(value, addr) \ 125 ns16550_writeb(com_port, \ 126 (unsigned char *)addr - (unsigned char *)com_port, value) 127 #define serial_in(addr) \ 128 ns16550_readb(com_port, \ 129 (unsigned char *)addr - (unsigned char *)com_port) 130 #endif 131 132 int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate) 133 { 134 const unsigned int mode_x_div = 16; 135 136 return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate); 137 } 138 139 static void NS16550_setbrg(NS16550_t com_port, int baud_divisor) 140 { 141 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 142 serial_out(baud_divisor & 0xff, &com_port->dll); 143 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 144 serial_out(UART_LCRVAL, &com_port->lcr); 145 } 146 147 void NS16550_init(NS16550_t com_port, int baud_divisor) 148 { 149 #if (defined(CONFIG_SPL_BUILD) && \ 150 (defined(CONFIG_OMAP34XX) || defined(CONFIG_OMAP44XX))) 151 /* 152 * On some OMAP3/OMAP4 devices when UART3 is configured for boot mode 153 * before SPL starts only THRE bit is set. We have to empty the 154 * transmitter before initialization starts. 155 */ 156 if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE)) 157 == UART_LSR_THRE) { 158 if (baud_divisor != -1) 159 NS16550_setbrg(com_port, baud_divisor); 160 serial_out(0, &com_port->mdr1); 161 } 162 #endif 163 164 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT)) 165 ; 166 167 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 168 #if defined(CONFIG_OMAP) || defined(CONFIG_AM33XX) || \ 169 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX) 170 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/ 171 #endif 172 serial_out(UART_MCRVAL, &com_port->mcr); 173 serial_out(UART_FCRVAL, &com_port->fcr); 174 if (baud_divisor != -1) 175 NS16550_setbrg(com_port, baud_divisor); 176 #if defined(CONFIG_OMAP) || \ 177 defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \ 178 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX) 179 180 /* /16 is proper to hit 115200 with 48MHz */ 181 serial_out(0, &com_port->mdr1); 182 #endif /* CONFIG_OMAP */ 183 #if defined(CONFIG_SOC_KEYSTONE) 184 serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC); 185 #endif 186 } 187 188 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 189 void NS16550_reinit(NS16550_t com_port, int baud_divisor) 190 { 191 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 192 NS16550_setbrg(com_port, 0); 193 serial_out(UART_MCRVAL, &com_port->mcr); 194 serial_out(UART_FCRVAL, &com_port->fcr); 195 NS16550_setbrg(com_port, baud_divisor); 196 } 197 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 198 199 void NS16550_putc(NS16550_t com_port, char c) 200 { 201 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0) 202 ; 203 serial_out(c, &com_port->thr); 204 205 /* 206 * Call watchdog_reset() upon newline. This is done here in putc 207 * since the environment code uses a single puts() to print the complete 208 * environment upon "printenv". So we can't put this watchdog call 209 * in puts(). 210 */ 211 if (c == '\n') 212 WATCHDOG_RESET(); 213 } 214 215 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 216 char NS16550_getc(NS16550_t com_port) 217 { 218 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) { 219 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY) 220 extern void usbtty_poll(void); 221 usbtty_poll(); 222 #endif 223 WATCHDOG_RESET(); 224 } 225 return serial_in(&com_port->rbr); 226 } 227 228 int NS16550_tstc(NS16550_t com_port) 229 { 230 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0; 231 } 232 233 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 234 235 #ifdef CONFIG_DEBUG_UART_NS16550 236 237 #include <debug_uart.h> 238 239 #define serial_dout(reg, value) \ 240 serial_out_shift((char *)com_port + \ 241 ((char *)reg - (char *)com_port) * \ 242 (1 << CONFIG_DEBUG_UART_SHIFT), \ 243 CONFIG_DEBUG_UART_SHIFT, value) 244 #define serial_din(reg) \ 245 serial_in_shift((char *)com_port + \ 246 ((char *)reg - (char *)com_port) * \ 247 (1 << CONFIG_DEBUG_UART_SHIFT), \ 248 CONFIG_DEBUG_UART_SHIFT) 249 250 static inline void _debug_uart_init(void) 251 { 252 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE; 253 int baud_divisor; 254 255 /* 256 * We copy the code from above because it is already horribly messy. 257 * Trying to refactor to nicely remove the duplication doesn't seem 258 * feasible. The better fix is to move all users of this driver to 259 * driver model. 260 */ 261 baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK, 262 CONFIG_BAUDRATE); 263 serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER); 264 serial_dout(&com_port->mcr, UART_MCRVAL); 265 serial_dout(&com_port->fcr, UART_FCRVAL); 266 267 serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL); 268 serial_dout(&com_port->dll, baud_divisor & 0xff); 269 serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff); 270 serial_dout(&com_port->lcr, UART_LCRVAL); 271 } 272 273 static inline void _debug_uart_putc(int ch) 274 { 275 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE; 276 277 while (!(serial_din(&com_port->lsr) & UART_LSR_THRE)) 278 ; 279 serial_dout(&com_port->thr, ch); 280 } 281 282 DEBUG_UART_FUNCS 283 284 #endif 285 286 #ifdef CONFIG_DM_SERIAL 287 static int ns16550_serial_putc(struct udevice *dev, const char ch) 288 { 289 struct NS16550 *const com_port = dev_get_priv(dev); 290 291 if (!(serial_in(&com_port->lsr) & UART_LSR_THRE)) 292 return -EAGAIN; 293 serial_out(ch, &com_port->thr); 294 295 /* 296 * Call watchdog_reset() upon newline. This is done here in putc 297 * since the environment code uses a single puts() to print the complete 298 * environment upon "printenv". So we can't put this watchdog call 299 * in puts(). 300 */ 301 if (ch == '\n') 302 WATCHDOG_RESET(); 303 304 return 0; 305 } 306 307 static int ns16550_serial_pending(struct udevice *dev, bool input) 308 { 309 struct NS16550 *const com_port = dev_get_priv(dev); 310 311 if (input) 312 return serial_in(&com_port->lsr) & UART_LSR_DR ? 1 : 0; 313 else 314 return serial_in(&com_port->lsr) & UART_LSR_THRE ? 0 : 1; 315 } 316 317 static int ns16550_serial_getc(struct udevice *dev) 318 { 319 struct NS16550 *const com_port = dev_get_priv(dev); 320 321 if (!(serial_in(&com_port->lsr) & UART_LSR_DR)) 322 return -EAGAIN; 323 324 return serial_in(&com_port->rbr); 325 } 326 327 static int ns16550_serial_setbrg(struct udevice *dev, int baudrate) 328 { 329 struct NS16550 *const com_port = dev_get_priv(dev); 330 struct ns16550_platdata *plat = com_port->plat; 331 int clock_divisor; 332 333 clock_divisor = ns16550_calc_divisor(com_port, plat->clock, baudrate); 334 335 NS16550_setbrg(com_port, clock_divisor); 336 337 return 0; 338 } 339 340 int ns16550_serial_probe(struct udevice *dev) 341 { 342 struct NS16550 *const com_port = dev_get_priv(dev); 343 344 com_port->plat = dev_get_platdata(dev); 345 NS16550_init(com_port, -1); 346 347 return 0; 348 } 349 350 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA) 351 int ns16550_serial_ofdata_to_platdata(struct udevice *dev) 352 { 353 struct ns16550_platdata *plat = dev->platdata; 354 fdt_addr_t addr; 355 356 /* try Processor Local Bus device first */ 357 addr = dev_get_addr(dev); 358 #if defined(CONFIG_PCI) && defined(CONFIG_DM_PCI) 359 if (addr == FDT_ADDR_T_NONE) { 360 /* then try pci device */ 361 struct fdt_pci_addr pci_addr; 362 u32 bar; 363 int ret; 364 365 /* we prefer to use a memory-mapped register */ 366 ret = fdtdec_get_pci_addr(gd->fdt_blob, dev->of_offset, 367 FDT_PCI_SPACE_MEM32, "reg", 368 &pci_addr); 369 if (ret) { 370 /* try if there is any i/o-mapped register */ 371 ret = fdtdec_get_pci_addr(gd->fdt_blob, 372 dev->of_offset, 373 FDT_PCI_SPACE_IO, 374 "reg", &pci_addr); 375 if (ret) 376 return ret; 377 } 378 379 ret = fdtdec_get_pci_bar32(dev, &pci_addr, &bar); 380 if (ret) 381 return ret; 382 383 addr = bar; 384 } 385 #endif 386 387 if (addr == FDT_ADDR_T_NONE) 388 return -EINVAL; 389 390 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED 391 plat->base = addr; 392 #else 393 plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE); 394 #endif 395 396 plat->reg_offset = fdtdec_get_int(gd->fdt_blob, dev->of_offset, 397 "reg-offset", 0); 398 plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset, 399 "reg-shift", 0); 400 plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset, 401 "clock-frequency", 402 CONFIG_SYS_NS16550_CLK); 403 if (!plat->clock) { 404 debug("ns16550 clock not defined\n"); 405 return -EINVAL; 406 } 407 408 return 0; 409 } 410 #endif 411 412 const struct dm_serial_ops ns16550_serial_ops = { 413 .putc = ns16550_serial_putc, 414 .pending = ns16550_serial_pending, 415 .getc = ns16550_serial_getc, 416 .setbrg = ns16550_serial_setbrg, 417 }; 418 419 #if !CONFIG_IS_ENABLED(OF_PLATDATA) 420 #if CONFIG_IS_ENABLED(OF_CONTROL) 421 /* 422 * Please consider existing compatible strings before adding a new 423 * one to keep this table compact. Or you may add a generic "ns16550" 424 * compatible string to your dts. 425 */ 426 static const struct udevice_id ns16550_serial_ids[] = { 427 { .compatible = "ns16550" }, 428 { .compatible = "ns16550a" }, 429 { .compatible = "nvidia,tegra20-uart" }, 430 { .compatible = "snps,dw-apb-uart" }, 431 { .compatible = "ti,omap2-uart" }, 432 { .compatible = "ti,omap3-uart" }, 433 { .compatible = "ti,omap4-uart" }, 434 { .compatible = "ti,am3352-uart" }, 435 { .compatible = "ti,am4372-uart" }, 436 { .compatible = "ti,dra742-uart" }, 437 {} 438 }; 439 #endif 440 441 #if CONFIG_IS_ENABLED(SERIAL_PRESENT) 442 U_BOOT_DRIVER(ns16550_serial) = { 443 .name = "ns16550_serial", 444 .id = UCLASS_SERIAL, 445 #if CONFIG_IS_ENABLED(OF_CONTROL) 446 .of_match = ns16550_serial_ids, 447 .ofdata_to_platdata = ns16550_serial_ofdata_to_platdata, 448 .platdata_auto_alloc_size = sizeof(struct ns16550_platdata), 449 #endif 450 .priv_auto_alloc_size = sizeof(struct NS16550), 451 .probe = ns16550_serial_probe, 452 .ops = &ns16550_serial_ops, 453 .flags = DM_FLAG_PRE_RELOC, 454 }; 455 #endif 456 #endif /* !OF_PLATDATA */ 457 #endif /* CONFIG_DM_SERIAL */ 458