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 <mapmem.h> 12 #include <ns16550.h> 13 #include <serial.h> 14 #include <watchdog.h> 15 #include <linux/types.h> 16 #include <asm/io.h> 17 18 DECLARE_GLOBAL_DATA_PTR; 19 20 #define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */ 21 #define UART_MCRVAL (UART_MCR_DTR | \ 22 UART_MCR_RTS) /* RTS/DTR */ 23 #define UART_FCRVAL (UART_FCR_FIFO_EN | \ 24 UART_FCR_RXSR | \ 25 UART_FCR_TXSR) /* Clear & enable FIFOs */ 26 27 #ifndef CONFIG_DM_SERIAL 28 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED 29 #define serial_out(x, y) outb(x, (ulong)y) 30 #define serial_in(y) inb((ulong)y) 31 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0) 32 #define serial_out(x, y) out_be32(y, x) 33 #define serial_in(y) in_be32(y) 34 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0) 35 #define serial_out(x, y) out_le32(y, x) 36 #define serial_in(y) in_le32(y) 37 #else 38 #define serial_out(x, y) writeb(x, y) 39 #define serial_in(y) readb(y) 40 #endif 41 #endif /* !CONFIG_DM_SERIAL */ 42 43 #if defined(CONFIG_SOC_KEYSTONE) 44 #define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0 45 #define UART_REG_VAL_PWREMU_MGMT_UART_ENABLE ((1 << 14) | (1 << 13) | (1 << 0)) 46 #undef UART_MCRVAL 47 #ifdef CONFIG_SERIAL_HW_FLOW_CONTROL 48 #define UART_MCRVAL (UART_MCR_RTS | UART_MCR_AFE) 49 #else 50 #define UART_MCRVAL (UART_MCR_RTS) 51 #endif 52 #endif 53 54 #ifndef CONFIG_SYS_NS16550_IER 55 #define CONFIG_SYS_NS16550_IER 0x00 56 #endif /* CONFIG_SYS_NS16550_IER */ 57 58 #ifdef CONFIG_DM_SERIAL 59 60 static inline void serial_out_shift(void *addr, int shift, int value) 61 { 62 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED 63 outb(value, (ulong)addr); 64 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN) 65 out_le32(addr, value); 66 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN) 67 out_be32(addr, value); 68 #elif defined(CONFIG_SYS_NS16550_MEM32) 69 writel(value, addr); 70 #elif defined(CONFIG_SYS_BIG_ENDIAN) 71 writeb(value, addr + (1 << shift) - 1); 72 #else 73 writeb(value, addr); 74 #endif 75 } 76 77 static inline int serial_in_shift(void *addr, int shift) 78 { 79 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED 80 return inb((ulong)addr); 81 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN) 82 return in_le32(addr); 83 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN) 84 return in_be32(addr); 85 #elif defined(CONFIG_SYS_NS16550_MEM32) 86 return readl(addr); 87 #elif defined(CONFIG_SYS_BIG_ENDIAN) 88 return readb(addr + (1 << shift) - 1); 89 #else 90 return readb(addr); 91 #endif 92 } 93 94 static void ns16550_writeb(NS16550_t port, int offset, int value) 95 { 96 struct ns16550_platdata *plat = port->plat; 97 unsigned char *addr; 98 99 offset *= 1 << plat->reg_shift; 100 addr = map_sysmem(plat->base, 0) + offset; 101 /* 102 * As far as we know it doesn't make sense to support selection of 103 * these options at run-time, so use the existing CONFIG options. 104 */ 105 serial_out_shift(addr, plat->reg_shift, value); 106 } 107 108 static int ns16550_readb(NS16550_t port, int offset) 109 { 110 struct ns16550_platdata *plat = port->plat; 111 unsigned char *addr; 112 113 offset *= 1 << plat->reg_shift; 114 addr = map_sysmem(plat->base, 0) + offset; 115 116 return serial_in_shift(addr, plat->reg_shift); 117 } 118 119 /* We can clean these up once everything is moved to driver model */ 120 #define serial_out(value, addr) \ 121 ns16550_writeb(com_port, \ 122 (unsigned char *)addr - (unsigned char *)com_port, value) 123 #define serial_in(addr) \ 124 ns16550_readb(com_port, \ 125 (unsigned char *)addr - (unsigned char *)com_port) 126 #endif 127 128 static inline int calc_divisor(NS16550_t port, int clock, int baudrate) 129 { 130 const unsigned int mode_x_div = 16; 131 132 return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate); 133 } 134 135 int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate) 136 { 137 #ifdef CONFIG_OMAP1510 138 /* If can't cleanly clock 115200 set div to 1 */ 139 if ((clock == 12000000) && (baudrate == 115200)) { 140 port->osc_12m_sel = OSC_12M_SEL; /* enable 6.5 * divisor */ 141 return 1; /* return 1 for base divisor */ 142 } 143 port->osc_12m_sel = 0; /* clear if previsouly set */ 144 #endif 145 146 return calc_divisor(port, clock, baudrate); 147 } 148 149 static void NS16550_setbrg(NS16550_t com_port, int baud_divisor) 150 { 151 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr); 152 serial_out(baud_divisor & 0xff, &com_port->dll); 153 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm); 154 serial_out(UART_LCRVAL, &com_port->lcr); 155 } 156 157 void NS16550_init(NS16550_t com_port, int baud_divisor) 158 { 159 #if (defined(CONFIG_SPL_BUILD) && \ 160 (defined(CONFIG_OMAP34XX) || defined(CONFIG_OMAP44XX))) 161 /* 162 * On some OMAP3/OMAP4 devices when UART3 is configured for boot mode 163 * before SPL starts only THRE bit is set. We have to empty the 164 * transmitter before initialization starts. 165 */ 166 if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE)) 167 == UART_LSR_THRE) { 168 if (baud_divisor != -1) 169 NS16550_setbrg(com_port, baud_divisor); 170 serial_out(0, &com_port->mdr1); 171 } 172 #endif 173 174 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT)) 175 ; 176 177 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 178 #if defined(CONFIG_OMAP) || defined(CONFIG_AM33XX) || \ 179 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX) 180 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/ 181 #endif 182 serial_out(UART_MCRVAL, &com_port->mcr); 183 serial_out(UART_FCRVAL, &com_port->fcr); 184 if (baud_divisor != -1) 185 NS16550_setbrg(com_port, baud_divisor); 186 #if defined(CONFIG_OMAP) || \ 187 defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \ 188 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX) 189 190 /* /16 is proper to hit 115200 with 48MHz */ 191 serial_out(0, &com_port->mdr1); 192 #endif /* CONFIG_OMAP */ 193 #if defined(CONFIG_SOC_KEYSTONE) 194 serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC); 195 #endif 196 } 197 198 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 199 void NS16550_reinit(NS16550_t com_port, int baud_divisor) 200 { 201 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier); 202 NS16550_setbrg(com_port, 0); 203 serial_out(UART_MCRVAL, &com_port->mcr); 204 serial_out(UART_FCRVAL, &com_port->fcr); 205 NS16550_setbrg(com_port, baud_divisor); 206 } 207 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 208 209 void NS16550_putc(NS16550_t com_port, char c) 210 { 211 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0) 212 ; 213 serial_out(c, &com_port->thr); 214 215 /* 216 * Call watchdog_reset() upon newline. This is done here in putc 217 * since the environment code uses a single puts() to print the complete 218 * environment upon "printenv". So we can't put this watchdog call 219 * in puts(). 220 */ 221 if (c == '\n') 222 WATCHDOG_RESET(); 223 } 224 225 #ifndef CONFIG_NS16550_MIN_FUNCTIONS 226 char NS16550_getc(NS16550_t com_port) 227 { 228 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) { 229 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY) 230 extern void usbtty_poll(void); 231 usbtty_poll(); 232 #endif 233 WATCHDOG_RESET(); 234 } 235 return serial_in(&com_port->rbr); 236 } 237 238 int NS16550_tstc(NS16550_t com_port) 239 { 240 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0; 241 } 242 243 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */ 244 245 #ifdef CONFIG_DEBUG_UART_NS16550 246 247 #include <debug_uart.h> 248 249 #define serial_dout(reg, value) \ 250 serial_out_shift((char *)com_port + \ 251 ((char *)reg - (char *)com_port) * \ 252 (1 << CONFIG_DEBUG_UART_SHIFT), \ 253 CONFIG_DEBUG_UART_SHIFT, value) 254 #define serial_din(reg) \ 255 serial_in_shift((char *)com_port + \ 256 ((char *)reg - (char *)com_port) * \ 257 (1 << CONFIG_DEBUG_UART_SHIFT), \ 258 CONFIG_DEBUG_UART_SHIFT) 259 260 void debug_uart_init(void) 261 { 262 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE; 263 int baud_divisor; 264 265 /* 266 * We copy the code from above because it is already horribly messy. 267 * Trying to refactor to nicely remove the duplication doesn't seem 268 * feasible. The better fix is to move all users of this driver to 269 * driver model. 270 */ 271 baud_divisor = calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK, 272 CONFIG_BAUDRATE); 273 serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER); 274 serial_dout(&com_port->mcr, UART_MCRVAL); 275 serial_dout(&com_port->fcr, UART_FCRVAL); 276 277 serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL); 278 serial_dout(&com_port->dll, baud_divisor & 0xff); 279 serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff); 280 serial_dout(&com_port->lcr, UART_LCRVAL); 281 } 282 283 static inline void _debug_uart_putc(int ch) 284 { 285 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE; 286 287 while (!(serial_din(&com_port->lsr) & UART_LSR_THRE)) 288 ; 289 serial_dout(&com_port->thr, ch); 290 } 291 292 DEBUG_UART_FUNCS 293 294 #endif 295 296 #ifdef CONFIG_DM_SERIAL 297 static int ns16550_serial_putc(struct udevice *dev, const char ch) 298 { 299 struct NS16550 *const com_port = dev_get_priv(dev); 300 301 if (!(serial_in(&com_port->lsr) & UART_LSR_THRE)) 302 return -EAGAIN; 303 serial_out(ch, &com_port->thr); 304 305 /* 306 * Call watchdog_reset() upon newline. This is done here in putc 307 * since the environment code uses a single puts() to print the complete 308 * environment upon "printenv". So we can't put this watchdog call 309 * in puts(). 310 */ 311 if (ch == '\n') 312 WATCHDOG_RESET(); 313 314 return 0; 315 } 316 317 static int ns16550_serial_pending(struct udevice *dev, bool input) 318 { 319 struct NS16550 *const com_port = dev_get_priv(dev); 320 321 if (input) 322 return serial_in(&com_port->lsr) & UART_LSR_DR ? 1 : 0; 323 else 324 return serial_in(&com_port->lsr) & UART_LSR_THRE ? 0 : 1; 325 } 326 327 static int ns16550_serial_getc(struct udevice *dev) 328 { 329 struct NS16550 *const com_port = dev_get_priv(dev); 330 331 if (!(serial_in(&com_port->lsr) & UART_LSR_DR)) 332 return -EAGAIN; 333 334 return serial_in(&com_port->rbr); 335 } 336 337 static int ns16550_serial_setbrg(struct udevice *dev, int baudrate) 338 { 339 struct NS16550 *const com_port = dev_get_priv(dev); 340 struct ns16550_platdata *plat = com_port->plat; 341 int clock_divisor; 342 343 clock_divisor = ns16550_calc_divisor(com_port, plat->clock, baudrate); 344 345 NS16550_setbrg(com_port, clock_divisor); 346 347 return 0; 348 } 349 350 int ns16550_serial_probe(struct udevice *dev) 351 { 352 struct NS16550 *const com_port = dev_get_priv(dev); 353 354 com_port->plat = dev_get_platdata(dev); 355 NS16550_init(com_port, -1); 356 357 return 0; 358 } 359 360 #ifdef CONFIG_OF_CONTROL 361 int ns16550_serial_ofdata_to_platdata(struct udevice *dev) 362 { 363 struct ns16550_platdata *plat = dev->platdata; 364 fdt_addr_t addr; 365 366 /* try Processor Local Bus device first */ 367 addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg"); 368 #ifdef CONFIG_PCI 369 if (addr == FDT_ADDR_T_NONE) { 370 /* then try pci device */ 371 struct fdt_pci_addr pci_addr; 372 u32 bar; 373 int ret; 374 375 /* we prefer to use a memory-mapped register */ 376 ret = fdtdec_get_pci_addr(gd->fdt_blob, dev->of_offset, 377 FDT_PCI_SPACE_MEM32, "reg", 378 &pci_addr); 379 if (ret) { 380 /* try if there is any i/o-mapped register */ 381 ret = fdtdec_get_pci_addr(gd->fdt_blob, 382 dev->of_offset, 383 FDT_PCI_SPACE_IO, 384 "reg", &pci_addr); 385 if (ret) 386 return ret; 387 } 388 389 ret = fdtdec_get_pci_bar32(gd->fdt_blob, dev->of_offset, 390 &pci_addr, &bar); 391 if (ret) 392 return ret; 393 394 addr = bar; 395 } 396 #endif 397 398 if (addr == FDT_ADDR_T_NONE) 399 return -EINVAL; 400 401 plat->base = addr; 402 plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset, 403 "reg-shift", 1); 404 405 return 0; 406 } 407 #endif 408 409 const struct dm_serial_ops ns16550_serial_ops = { 410 .putc = ns16550_serial_putc, 411 .pending = ns16550_serial_pending, 412 .getc = ns16550_serial_getc, 413 .setbrg = ns16550_serial_setbrg, 414 }; 415 #endif /* CONFIG_DM_SERIAL */ 416