1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs. 4 * 5 * FIXME According to the usermanual the status bits in the status register 6 * are only updated when the peripherals access the FIFO and not when the 7 * CPU access them. So since we use this bits to know when we stop writing 8 * and reading, they may not be updated in-time and a race condition may 9 * exists. But I haven't be able to prove this and I don't care. But if 10 * any problem arises, it might worth checking. The TX/RX FIFO Stats 11 * registers should be used in addition. 12 * Update: Actually, they seem updated ... At least the bits we use. 13 * 14 * 15 * Maintainer : Sylvain Munaut <tnt@246tNt.com> 16 * 17 * Some of the code has been inspired/copied from the 2.4 code written 18 * by Dale Farnsworth <dfarnsworth@mvista.com>. 19 * 20 * Copyright (C) 2008 Freescale Semiconductor Inc. 21 * John Rigby <jrigby@gmail.com> 22 * Added support for MPC5121 23 * Copyright (C) 2006 Secret Lab Technologies Ltd. 24 * Grant Likely <grant.likely@secretlab.ca> 25 * Copyright (C) 2004-2006 Sylvain Munaut <tnt@246tNt.com> 26 * Copyright (C) 2003 MontaVista, Software, Inc. 27 */ 28 29 #undef DEBUG 30 31 #include <linux/device.h> 32 #include <linux/module.h> 33 #include <linux/tty.h> 34 #include <linux/tty_flip.h> 35 #include <linux/serial.h> 36 #include <linux/sysrq.h> 37 #include <linux/console.h> 38 #include <linux/delay.h> 39 #include <linux/io.h> 40 #include <linux/of.h> 41 #include <linux/of_address.h> 42 #include <linux/of_irq.h> 43 #include <linux/of_platform.h> 44 #include <linux/clk.h> 45 46 #include <asm/mpc52xx.h> 47 #include <asm/mpc52xx_psc.h> 48 49 #include <linux/serial_core.h> 50 51 52 /* We've been assigned a range on the "Low-density serial ports" major */ 53 #define SERIAL_PSC_MAJOR 204 54 #define SERIAL_PSC_MINOR 148 55 56 57 #define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */ 58 59 60 static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM]; 61 /* Rem: - We use the read_status_mask as a shadow of 62 * psc->mpc52xx_psc_imr 63 * - It's important that is array is all zero on start as we 64 * use it to know if it's initialized or not ! If it's not sure 65 * it's cleared, then a memset(...,0,...) should be added to 66 * the console_init 67 */ 68 69 /* lookup table for matching device nodes to index numbers */ 70 static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM]; 71 72 static void mpc52xx_uart_of_enumerate(void); 73 74 75 #define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase)) 76 77 78 /* Forward declaration of the interruption handling routine */ 79 static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id); 80 static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port); 81 82 /* ======================================================================== */ 83 /* PSC fifo operations for isolating differences between 52xx and 512x */ 84 /* ======================================================================== */ 85 86 struct psc_ops { 87 void (*fifo_init)(struct uart_port *port); 88 unsigned int (*raw_rx_rdy)(struct uart_port *port); 89 unsigned int (*raw_tx_rdy)(struct uart_port *port); 90 unsigned int (*rx_rdy)(struct uart_port *port); 91 unsigned int (*tx_rdy)(struct uart_port *port); 92 unsigned int (*tx_empty)(struct uart_port *port); 93 void (*stop_rx)(struct uart_port *port); 94 void (*start_tx)(struct uart_port *port); 95 void (*stop_tx)(struct uart_port *port); 96 void (*rx_clr_irq)(struct uart_port *port); 97 void (*tx_clr_irq)(struct uart_port *port); 98 void (*write_char)(struct uart_port *port, unsigned char c); 99 unsigned char (*read_char)(struct uart_port *port); 100 void (*cw_disable_ints)(struct uart_port *port); 101 void (*cw_restore_ints)(struct uart_port *port); 102 unsigned int (*set_baudrate)(struct uart_port *port, 103 struct ktermios *new, 104 struct ktermios *old); 105 int (*clock_alloc)(struct uart_port *port); 106 void (*clock_relse)(struct uart_port *port); 107 int (*clock)(struct uart_port *port, int enable); 108 int (*fifoc_init)(void); 109 void (*fifoc_uninit)(void); 110 void (*get_irq)(struct uart_port *, struct device_node *); 111 irqreturn_t (*handle_irq)(struct uart_port *port); 112 u16 (*get_status)(struct uart_port *port); 113 u8 (*get_ipcr)(struct uart_port *port); 114 void (*command)(struct uart_port *port, u8 cmd); 115 void (*set_mode)(struct uart_port *port, u8 mr1, u8 mr2); 116 void (*set_rts)(struct uart_port *port, int state); 117 void (*enable_ms)(struct uart_port *port); 118 void (*set_sicr)(struct uart_port *port, u32 val); 119 void (*set_imr)(struct uart_port *port, u16 val); 120 u8 (*get_mr1)(struct uart_port *port); 121 }; 122 123 /* setting the prescaler and divisor reg is common for all chips */ 124 static inline void mpc52xx_set_divisor(struct mpc52xx_psc __iomem *psc, 125 u16 prescaler, unsigned int divisor) 126 { 127 /* select prescaler */ 128 out_be16(&psc->mpc52xx_psc_clock_select, prescaler); 129 out_8(&psc->ctur, divisor >> 8); 130 out_8(&psc->ctlr, divisor & 0xff); 131 } 132 133 static u16 mpc52xx_psc_get_status(struct uart_port *port) 134 { 135 return in_be16(&PSC(port)->mpc52xx_psc_status); 136 } 137 138 static u8 mpc52xx_psc_get_ipcr(struct uart_port *port) 139 { 140 return in_8(&PSC(port)->mpc52xx_psc_ipcr); 141 } 142 143 static void mpc52xx_psc_command(struct uart_port *port, u8 cmd) 144 { 145 out_8(&PSC(port)->command, cmd); 146 } 147 148 static void mpc52xx_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2) 149 { 150 out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1); 151 out_8(&PSC(port)->mode, mr1); 152 out_8(&PSC(port)->mode, mr2); 153 } 154 155 static void mpc52xx_psc_set_rts(struct uart_port *port, int state) 156 { 157 if (state) 158 out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS); 159 else 160 out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS); 161 } 162 163 static void mpc52xx_psc_enable_ms(struct uart_port *port) 164 { 165 struct mpc52xx_psc __iomem *psc = PSC(port); 166 167 /* clear D_*-bits by reading them */ 168 in_8(&psc->mpc52xx_psc_ipcr); 169 /* enable CTS and DCD as IPC interrupts */ 170 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD); 171 172 port->read_status_mask |= MPC52xx_PSC_IMR_IPC; 173 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask); 174 } 175 176 static void mpc52xx_psc_set_sicr(struct uart_port *port, u32 val) 177 { 178 out_be32(&PSC(port)->sicr, val); 179 } 180 181 static void mpc52xx_psc_set_imr(struct uart_port *port, u16 val) 182 { 183 out_be16(&PSC(port)->mpc52xx_psc_imr, val); 184 } 185 186 static u8 mpc52xx_psc_get_mr1(struct uart_port *port) 187 { 188 out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1); 189 return in_8(&PSC(port)->mode); 190 } 191 192 #ifdef CONFIG_PPC_MPC52xx 193 #define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1)) 194 static void mpc52xx_psc_fifo_init(struct uart_port *port) 195 { 196 struct mpc52xx_psc __iomem *psc = PSC(port); 197 struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port); 198 199 out_8(&fifo->rfcntl, 0x00); 200 out_be16(&fifo->rfalarm, 0x1ff); 201 out_8(&fifo->tfcntl, 0x07); 202 out_be16(&fifo->tfalarm, 0x80); 203 204 port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY; 205 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask); 206 } 207 208 static unsigned int mpc52xx_psc_raw_rx_rdy(struct uart_port *port) 209 { 210 return in_be16(&PSC(port)->mpc52xx_psc_status) 211 & MPC52xx_PSC_SR_RXRDY; 212 } 213 214 static unsigned int mpc52xx_psc_raw_tx_rdy(struct uart_port *port) 215 { 216 return in_be16(&PSC(port)->mpc52xx_psc_status) 217 & MPC52xx_PSC_SR_TXRDY; 218 } 219 220 221 static unsigned int mpc52xx_psc_rx_rdy(struct uart_port *port) 222 { 223 return in_be16(&PSC(port)->mpc52xx_psc_isr) 224 & port->read_status_mask 225 & MPC52xx_PSC_IMR_RXRDY; 226 } 227 228 static unsigned int mpc52xx_psc_tx_rdy(struct uart_port *port) 229 { 230 return in_be16(&PSC(port)->mpc52xx_psc_isr) 231 & port->read_status_mask 232 & MPC52xx_PSC_IMR_TXRDY; 233 } 234 235 static unsigned int mpc52xx_psc_tx_empty(struct uart_port *port) 236 { 237 u16 sts = in_be16(&PSC(port)->mpc52xx_psc_status); 238 239 return (sts & MPC52xx_PSC_SR_TXEMP) ? TIOCSER_TEMT : 0; 240 } 241 242 static void mpc52xx_psc_start_tx(struct uart_port *port) 243 { 244 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY; 245 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask); 246 } 247 248 static void mpc52xx_psc_stop_tx(struct uart_port *port) 249 { 250 port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY; 251 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask); 252 } 253 254 static void mpc52xx_psc_stop_rx(struct uart_port *port) 255 { 256 port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY; 257 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask); 258 } 259 260 static void mpc52xx_psc_rx_clr_irq(struct uart_port *port) 261 { 262 } 263 264 static void mpc52xx_psc_tx_clr_irq(struct uart_port *port) 265 { 266 } 267 268 static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c) 269 { 270 out_8(&PSC(port)->mpc52xx_psc_buffer_8, c); 271 } 272 273 static unsigned char mpc52xx_psc_read_char(struct uart_port *port) 274 { 275 return in_8(&PSC(port)->mpc52xx_psc_buffer_8); 276 } 277 278 static void mpc52xx_psc_cw_disable_ints(struct uart_port *port) 279 { 280 out_be16(&PSC(port)->mpc52xx_psc_imr, 0); 281 } 282 283 static void mpc52xx_psc_cw_restore_ints(struct uart_port *port) 284 { 285 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask); 286 } 287 288 static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port, 289 struct ktermios *new, 290 struct ktermios *old) 291 { 292 unsigned int baud; 293 unsigned int divisor; 294 295 /* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */ 296 baud = uart_get_baud_rate(port, new, old, 297 port->uartclk / (32 * 0xffff) + 1, 298 port->uartclk / 32); 299 divisor = (port->uartclk + 16 * baud) / (32 * baud); 300 301 /* enable the /32 prescaler and set the divisor */ 302 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor); 303 return baud; 304 } 305 306 static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port, 307 struct ktermios *new, 308 struct ktermios *old) 309 { 310 unsigned int baud; 311 unsigned int divisor; 312 u16 prescaler; 313 314 /* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the 315 * ipb freq */ 316 baud = uart_get_baud_rate(port, new, old, 317 port->uartclk / (32 * 0xffff) + 1, 318 port->uartclk / 4); 319 divisor = (port->uartclk + 2 * baud) / (4 * baud); 320 321 /* select the proper prescaler and set the divisor 322 * prefer high prescaler for more tolerance on low baudrates */ 323 if (divisor > 0xffff || baud <= 115200) { 324 divisor = (divisor + 4) / 8; 325 prescaler = 0xdd00; /* /32 */ 326 } else 327 prescaler = 0xff00; /* /4 */ 328 mpc52xx_set_divisor(PSC(port), prescaler, divisor); 329 return baud; 330 } 331 332 static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np) 333 { 334 port->irqflags = 0; 335 port->irq = irq_of_parse_and_map(np, 0); 336 } 337 338 /* 52xx specific interrupt handler. The caller holds the port lock */ 339 static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port) 340 { 341 return mpc5xxx_uart_process_int(port); 342 } 343 344 static const struct psc_ops mpc52xx_psc_ops = { 345 .fifo_init = mpc52xx_psc_fifo_init, 346 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy, 347 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy, 348 .rx_rdy = mpc52xx_psc_rx_rdy, 349 .tx_rdy = mpc52xx_psc_tx_rdy, 350 .tx_empty = mpc52xx_psc_tx_empty, 351 .stop_rx = mpc52xx_psc_stop_rx, 352 .start_tx = mpc52xx_psc_start_tx, 353 .stop_tx = mpc52xx_psc_stop_tx, 354 .rx_clr_irq = mpc52xx_psc_rx_clr_irq, 355 .tx_clr_irq = mpc52xx_psc_tx_clr_irq, 356 .write_char = mpc52xx_psc_write_char, 357 .read_char = mpc52xx_psc_read_char, 358 .cw_disable_ints = mpc52xx_psc_cw_disable_ints, 359 .cw_restore_ints = mpc52xx_psc_cw_restore_ints, 360 .set_baudrate = mpc5200_psc_set_baudrate, 361 .get_irq = mpc52xx_psc_get_irq, 362 .handle_irq = mpc52xx_psc_handle_irq, 363 .get_status = mpc52xx_psc_get_status, 364 .get_ipcr = mpc52xx_psc_get_ipcr, 365 .command = mpc52xx_psc_command, 366 .set_mode = mpc52xx_psc_set_mode, 367 .set_rts = mpc52xx_psc_set_rts, 368 .enable_ms = mpc52xx_psc_enable_ms, 369 .set_sicr = mpc52xx_psc_set_sicr, 370 .set_imr = mpc52xx_psc_set_imr, 371 .get_mr1 = mpc52xx_psc_get_mr1, 372 }; 373 374 static const struct psc_ops mpc5200b_psc_ops = { 375 .fifo_init = mpc52xx_psc_fifo_init, 376 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy, 377 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy, 378 .rx_rdy = mpc52xx_psc_rx_rdy, 379 .tx_rdy = mpc52xx_psc_tx_rdy, 380 .tx_empty = mpc52xx_psc_tx_empty, 381 .stop_rx = mpc52xx_psc_stop_rx, 382 .start_tx = mpc52xx_psc_start_tx, 383 .stop_tx = mpc52xx_psc_stop_tx, 384 .rx_clr_irq = mpc52xx_psc_rx_clr_irq, 385 .tx_clr_irq = mpc52xx_psc_tx_clr_irq, 386 .write_char = mpc52xx_psc_write_char, 387 .read_char = mpc52xx_psc_read_char, 388 .cw_disable_ints = mpc52xx_psc_cw_disable_ints, 389 .cw_restore_ints = mpc52xx_psc_cw_restore_ints, 390 .set_baudrate = mpc5200b_psc_set_baudrate, 391 .get_irq = mpc52xx_psc_get_irq, 392 .handle_irq = mpc52xx_psc_handle_irq, 393 .get_status = mpc52xx_psc_get_status, 394 .get_ipcr = mpc52xx_psc_get_ipcr, 395 .command = mpc52xx_psc_command, 396 .set_mode = mpc52xx_psc_set_mode, 397 .set_rts = mpc52xx_psc_set_rts, 398 .enable_ms = mpc52xx_psc_enable_ms, 399 .set_sicr = mpc52xx_psc_set_sicr, 400 .set_imr = mpc52xx_psc_set_imr, 401 .get_mr1 = mpc52xx_psc_get_mr1, 402 }; 403 404 #endif /* CONFIG_PPC_MPC52xx */ 405 406 #ifdef CONFIG_PPC_MPC512x 407 #define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1)) 408 409 /* PSC FIFO Controller for mpc512x */ 410 struct psc_fifoc { 411 u32 fifoc_cmd; 412 u32 fifoc_int; 413 u32 fifoc_dma; 414 u32 fifoc_axe; 415 u32 fifoc_debug; 416 }; 417 418 static struct psc_fifoc __iomem *psc_fifoc; 419 static unsigned int psc_fifoc_irq; 420 static struct clk *psc_fifoc_clk; 421 422 static void mpc512x_psc_fifo_init(struct uart_port *port) 423 { 424 /* /32 prescaler */ 425 out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00); 426 427 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE); 428 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE); 429 out_be32(&FIFO_512x(port)->txalarm, 1); 430 out_be32(&FIFO_512x(port)->tximr, 0); 431 432 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE); 433 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE); 434 out_be32(&FIFO_512x(port)->rxalarm, 1); 435 out_be32(&FIFO_512x(port)->rximr, 0); 436 437 out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM); 438 out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM); 439 } 440 441 static unsigned int mpc512x_psc_raw_rx_rdy(struct uart_port *port) 442 { 443 return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY); 444 } 445 446 static unsigned int mpc512x_psc_raw_tx_rdy(struct uart_port *port) 447 { 448 return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL); 449 } 450 451 static unsigned int mpc512x_psc_rx_rdy(struct uart_port *port) 452 { 453 return in_be32(&FIFO_512x(port)->rxsr) 454 & in_be32(&FIFO_512x(port)->rximr) 455 & MPC512x_PSC_FIFO_ALARM; 456 } 457 458 static unsigned int mpc512x_psc_tx_rdy(struct uart_port *port) 459 { 460 return in_be32(&FIFO_512x(port)->txsr) 461 & in_be32(&FIFO_512x(port)->tximr) 462 & MPC512x_PSC_FIFO_ALARM; 463 } 464 465 static unsigned int mpc512x_psc_tx_empty(struct uart_port *port) 466 { 467 return in_be32(&FIFO_512x(port)->txsr) 468 & MPC512x_PSC_FIFO_EMPTY; 469 } 470 471 static void mpc512x_psc_stop_rx(struct uart_port *port) 472 { 473 unsigned long rx_fifo_imr; 474 475 rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr); 476 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM; 477 out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr); 478 } 479 480 static void mpc512x_psc_start_tx(struct uart_port *port) 481 { 482 unsigned long tx_fifo_imr; 483 484 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr); 485 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM; 486 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr); 487 } 488 489 static void mpc512x_psc_stop_tx(struct uart_port *port) 490 { 491 unsigned long tx_fifo_imr; 492 493 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr); 494 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM; 495 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr); 496 } 497 498 static void mpc512x_psc_rx_clr_irq(struct uart_port *port) 499 { 500 out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr)); 501 } 502 503 static void mpc512x_psc_tx_clr_irq(struct uart_port *port) 504 { 505 out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr)); 506 } 507 508 static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c) 509 { 510 out_8(&FIFO_512x(port)->txdata_8, c); 511 } 512 513 static unsigned char mpc512x_psc_read_char(struct uart_port *port) 514 { 515 return in_8(&FIFO_512x(port)->rxdata_8); 516 } 517 518 static void mpc512x_psc_cw_disable_ints(struct uart_port *port) 519 { 520 port->read_status_mask = 521 in_be32(&FIFO_512x(port)->tximr) << 16 | 522 in_be32(&FIFO_512x(port)->rximr); 523 out_be32(&FIFO_512x(port)->tximr, 0); 524 out_be32(&FIFO_512x(port)->rximr, 0); 525 } 526 527 static void mpc512x_psc_cw_restore_ints(struct uart_port *port) 528 { 529 out_be32(&FIFO_512x(port)->tximr, 530 (port->read_status_mask >> 16) & 0x7f); 531 out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f); 532 } 533 534 static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port, 535 struct ktermios *new, 536 struct ktermios *old) 537 { 538 unsigned int baud; 539 unsigned int divisor; 540 541 /* 542 * The "MPC5121e Microcontroller Reference Manual, Rev. 3" says on 543 * pg. 30-10 that the chip supports a /32 and a /10 prescaler. 544 * Furthermore, it states that "After reset, the prescaler by 10 545 * for the UART mode is selected", but the reset register value is 546 * 0x0000 which means a /32 prescaler. This is wrong. 547 * 548 * In reality using /32 prescaler doesn't work, as it is not supported! 549 * Use /16 or /10 prescaler, see "MPC5121e Hardware Design Guide", 550 * Chapter 4.1 PSC in UART Mode. 551 * Calculate with a /16 prescaler here. 552 */ 553 554 /* uartclk contains the ips freq */ 555 baud = uart_get_baud_rate(port, new, old, 556 port->uartclk / (16 * 0xffff) + 1, 557 port->uartclk / 16); 558 divisor = (port->uartclk + 8 * baud) / (16 * baud); 559 560 /* enable the /16 prescaler and set the divisor */ 561 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor); 562 return baud; 563 } 564 565 /* Init PSC FIFO Controller */ 566 static int __init mpc512x_psc_fifoc_init(void) 567 { 568 int err; 569 struct device_node *np; 570 struct clk *clk; 571 572 /* default error code, potentially overwritten by clock calls */ 573 err = -ENODEV; 574 575 np = of_find_compatible_node(NULL, NULL, 576 "fsl,mpc5121-psc-fifo"); 577 if (!np) { 578 pr_err("%s: Can't find FIFOC node\n", __func__); 579 goto out_err; 580 } 581 582 clk = of_clk_get(np, 0); 583 if (IS_ERR(clk)) { 584 /* backwards compat with device trees that lack clock specs */ 585 clk = clk_get_sys(np->name, "ipg"); 586 } 587 if (IS_ERR(clk)) { 588 pr_err("%s: Can't lookup FIFO clock\n", __func__); 589 err = PTR_ERR(clk); 590 goto out_ofnode_put; 591 } 592 if (clk_prepare_enable(clk)) { 593 pr_err("%s: Can't enable FIFO clock\n", __func__); 594 clk_put(clk); 595 goto out_ofnode_put; 596 } 597 psc_fifoc_clk = clk; 598 599 psc_fifoc = of_iomap(np, 0); 600 if (!psc_fifoc) { 601 pr_err("%s: Can't map FIFOC\n", __func__); 602 goto out_clk_disable; 603 } 604 605 psc_fifoc_irq = irq_of_parse_and_map(np, 0); 606 if (psc_fifoc_irq == 0) { 607 pr_err("%s: Can't get FIFOC irq\n", __func__); 608 goto out_unmap; 609 } 610 611 of_node_put(np); 612 return 0; 613 614 out_unmap: 615 iounmap(psc_fifoc); 616 out_clk_disable: 617 clk_disable_unprepare(psc_fifoc_clk); 618 clk_put(psc_fifoc_clk); 619 out_ofnode_put: 620 of_node_put(np); 621 out_err: 622 return err; 623 } 624 625 static void __exit mpc512x_psc_fifoc_uninit(void) 626 { 627 iounmap(psc_fifoc); 628 629 /* disable the clock, errors are not fatal */ 630 if (psc_fifoc_clk) { 631 clk_disable_unprepare(psc_fifoc_clk); 632 clk_put(psc_fifoc_clk); 633 psc_fifoc_clk = NULL; 634 } 635 } 636 637 /* 512x specific interrupt handler. The caller holds the port lock */ 638 static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port) 639 { 640 unsigned long fifoc_int; 641 int psc_num; 642 643 /* Read pending PSC FIFOC interrupts */ 644 fifoc_int = in_be32(&psc_fifoc->fifoc_int); 645 646 /* Check if it is an interrupt for this port */ 647 psc_num = (port->mapbase & 0xf00) >> 8; 648 if (test_bit(psc_num, &fifoc_int) || 649 test_bit(psc_num + 16, &fifoc_int)) 650 return mpc5xxx_uart_process_int(port); 651 652 return IRQ_NONE; 653 } 654 655 static struct clk *psc_mclk_clk[MPC52xx_PSC_MAXNUM]; 656 static struct clk *psc_ipg_clk[MPC52xx_PSC_MAXNUM]; 657 658 /* called from within the .request_port() callback (allocation) */ 659 static int mpc512x_psc_alloc_clock(struct uart_port *port) 660 { 661 int psc_num; 662 struct clk *clk; 663 int err; 664 665 psc_num = (port->mapbase & 0xf00) >> 8; 666 667 clk = devm_clk_get(port->dev, "mclk"); 668 if (IS_ERR(clk)) { 669 dev_err(port->dev, "Failed to get MCLK!\n"); 670 err = PTR_ERR(clk); 671 goto out_err; 672 } 673 err = clk_prepare_enable(clk); 674 if (err) { 675 dev_err(port->dev, "Failed to enable MCLK!\n"); 676 goto out_err; 677 } 678 psc_mclk_clk[psc_num] = clk; 679 680 clk = devm_clk_get(port->dev, "ipg"); 681 if (IS_ERR(clk)) { 682 dev_err(port->dev, "Failed to get IPG clock!\n"); 683 err = PTR_ERR(clk); 684 goto out_err; 685 } 686 err = clk_prepare_enable(clk); 687 if (err) { 688 dev_err(port->dev, "Failed to enable IPG clock!\n"); 689 goto out_err; 690 } 691 psc_ipg_clk[psc_num] = clk; 692 693 return 0; 694 695 out_err: 696 if (psc_mclk_clk[psc_num]) { 697 clk_disable_unprepare(psc_mclk_clk[psc_num]); 698 psc_mclk_clk[psc_num] = NULL; 699 } 700 if (psc_ipg_clk[psc_num]) { 701 clk_disable_unprepare(psc_ipg_clk[psc_num]); 702 psc_ipg_clk[psc_num] = NULL; 703 } 704 return err; 705 } 706 707 /* called from within the .release_port() callback (release) */ 708 static void mpc512x_psc_relse_clock(struct uart_port *port) 709 { 710 int psc_num; 711 struct clk *clk; 712 713 psc_num = (port->mapbase & 0xf00) >> 8; 714 clk = psc_mclk_clk[psc_num]; 715 if (clk) { 716 clk_disable_unprepare(clk); 717 psc_mclk_clk[psc_num] = NULL; 718 } 719 if (psc_ipg_clk[psc_num]) { 720 clk_disable_unprepare(psc_ipg_clk[psc_num]); 721 psc_ipg_clk[psc_num] = NULL; 722 } 723 } 724 725 /* implementation of the .clock() callback (enable/disable) */ 726 static int mpc512x_psc_endis_clock(struct uart_port *port, int enable) 727 { 728 int psc_num; 729 struct clk *psc_clk; 730 int ret; 731 732 if (uart_console(port)) 733 return 0; 734 735 psc_num = (port->mapbase & 0xf00) >> 8; 736 psc_clk = psc_mclk_clk[psc_num]; 737 if (!psc_clk) { 738 dev_err(port->dev, "Failed to get PSC clock entry!\n"); 739 return -ENODEV; 740 } 741 742 dev_dbg(port->dev, "mclk %sable\n", enable ? "en" : "dis"); 743 if (enable) { 744 ret = clk_enable(psc_clk); 745 if (ret) 746 dev_err(port->dev, "Failed to enable MCLK!\n"); 747 return ret; 748 } else { 749 clk_disable(psc_clk); 750 return 0; 751 } 752 } 753 754 static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np) 755 { 756 port->irqflags = IRQF_SHARED; 757 port->irq = psc_fifoc_irq; 758 } 759 760 #define PSC_5125(port) ((struct mpc5125_psc __iomem *)((port)->membase)) 761 #define FIFO_5125(port) ((struct mpc512x_psc_fifo __iomem *)(PSC_5125(port)+1)) 762 763 static void mpc5125_psc_fifo_init(struct uart_port *port) 764 { 765 /* /32 prescaler */ 766 out_8(&PSC_5125(port)->mpc52xx_psc_clock_select, 0xdd); 767 768 out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE); 769 out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE); 770 out_be32(&FIFO_5125(port)->txalarm, 1); 771 out_be32(&FIFO_5125(port)->tximr, 0); 772 773 out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE); 774 out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE); 775 out_be32(&FIFO_5125(port)->rxalarm, 1); 776 out_be32(&FIFO_5125(port)->rximr, 0); 777 778 out_be32(&FIFO_5125(port)->tximr, MPC512x_PSC_FIFO_ALARM); 779 out_be32(&FIFO_5125(port)->rximr, MPC512x_PSC_FIFO_ALARM); 780 } 781 782 static unsigned int mpc5125_psc_raw_rx_rdy(struct uart_port *port) 783 { 784 return !(in_be32(&FIFO_5125(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY); 785 } 786 787 static unsigned int mpc5125_psc_raw_tx_rdy(struct uart_port *port) 788 { 789 return !(in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_FULL); 790 } 791 792 static unsigned int mpc5125_psc_rx_rdy(struct uart_port *port) 793 { 794 return in_be32(&FIFO_5125(port)->rxsr) & 795 in_be32(&FIFO_5125(port)->rximr) & MPC512x_PSC_FIFO_ALARM; 796 } 797 798 static unsigned int mpc5125_psc_tx_rdy(struct uart_port *port) 799 { 800 return in_be32(&FIFO_5125(port)->txsr) & 801 in_be32(&FIFO_5125(port)->tximr) & MPC512x_PSC_FIFO_ALARM; 802 } 803 804 static unsigned int mpc5125_psc_tx_empty(struct uart_port *port) 805 { 806 return in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_EMPTY; 807 } 808 809 static void mpc5125_psc_stop_rx(struct uart_port *port) 810 { 811 unsigned long rx_fifo_imr; 812 813 rx_fifo_imr = in_be32(&FIFO_5125(port)->rximr); 814 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM; 815 out_be32(&FIFO_5125(port)->rximr, rx_fifo_imr); 816 } 817 818 static void mpc5125_psc_start_tx(struct uart_port *port) 819 { 820 unsigned long tx_fifo_imr; 821 822 tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr); 823 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM; 824 out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr); 825 } 826 827 static void mpc5125_psc_stop_tx(struct uart_port *port) 828 { 829 unsigned long tx_fifo_imr; 830 831 tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr); 832 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM; 833 out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr); 834 } 835 836 static void mpc5125_psc_rx_clr_irq(struct uart_port *port) 837 { 838 out_be32(&FIFO_5125(port)->rxisr, in_be32(&FIFO_5125(port)->rxisr)); 839 } 840 841 static void mpc5125_psc_tx_clr_irq(struct uart_port *port) 842 { 843 out_be32(&FIFO_5125(port)->txisr, in_be32(&FIFO_5125(port)->txisr)); 844 } 845 846 static void mpc5125_psc_write_char(struct uart_port *port, unsigned char c) 847 { 848 out_8(&FIFO_5125(port)->txdata_8, c); 849 } 850 851 static unsigned char mpc5125_psc_read_char(struct uart_port *port) 852 { 853 return in_8(&FIFO_5125(port)->rxdata_8); 854 } 855 856 static void mpc5125_psc_cw_disable_ints(struct uart_port *port) 857 { 858 port->read_status_mask = 859 in_be32(&FIFO_5125(port)->tximr) << 16 | 860 in_be32(&FIFO_5125(port)->rximr); 861 out_be32(&FIFO_5125(port)->tximr, 0); 862 out_be32(&FIFO_5125(port)->rximr, 0); 863 } 864 865 static void mpc5125_psc_cw_restore_ints(struct uart_port *port) 866 { 867 out_be32(&FIFO_5125(port)->tximr, 868 (port->read_status_mask >> 16) & 0x7f); 869 out_be32(&FIFO_5125(port)->rximr, port->read_status_mask & 0x7f); 870 } 871 872 static inline void mpc5125_set_divisor(struct mpc5125_psc __iomem *psc, 873 u8 prescaler, unsigned int divisor) 874 { 875 /* select prescaler */ 876 out_8(&psc->mpc52xx_psc_clock_select, prescaler); 877 out_8(&psc->ctur, divisor >> 8); 878 out_8(&psc->ctlr, divisor & 0xff); 879 } 880 881 static unsigned int mpc5125_psc_set_baudrate(struct uart_port *port, 882 struct ktermios *new, 883 struct ktermios *old) 884 { 885 unsigned int baud; 886 unsigned int divisor; 887 888 /* 889 * Calculate with a /16 prescaler here. 890 */ 891 892 /* uartclk contains the ips freq */ 893 baud = uart_get_baud_rate(port, new, old, 894 port->uartclk / (16 * 0xffff) + 1, 895 port->uartclk / 16); 896 divisor = (port->uartclk + 8 * baud) / (16 * baud); 897 898 /* enable the /16 prescaler and set the divisor */ 899 mpc5125_set_divisor(PSC_5125(port), 0xdd, divisor); 900 return baud; 901 } 902 903 /* 904 * MPC5125 have compatible PSC FIFO Controller. 905 * Special init not needed. 906 */ 907 static u16 mpc5125_psc_get_status(struct uart_port *port) 908 { 909 return in_be16(&PSC_5125(port)->mpc52xx_psc_status); 910 } 911 912 static u8 mpc5125_psc_get_ipcr(struct uart_port *port) 913 { 914 return in_8(&PSC_5125(port)->mpc52xx_psc_ipcr); 915 } 916 917 static void mpc5125_psc_command(struct uart_port *port, u8 cmd) 918 { 919 out_8(&PSC_5125(port)->command, cmd); 920 } 921 922 static void mpc5125_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2) 923 { 924 out_8(&PSC_5125(port)->mr1, mr1); 925 out_8(&PSC_5125(port)->mr2, mr2); 926 } 927 928 static void mpc5125_psc_set_rts(struct uart_port *port, int state) 929 { 930 if (state & TIOCM_RTS) 931 out_8(&PSC_5125(port)->op1, MPC52xx_PSC_OP_RTS); 932 else 933 out_8(&PSC_5125(port)->op0, MPC52xx_PSC_OP_RTS); 934 } 935 936 static void mpc5125_psc_enable_ms(struct uart_port *port) 937 { 938 struct mpc5125_psc __iomem *psc = PSC_5125(port); 939 940 /* clear D_*-bits by reading them */ 941 in_8(&psc->mpc52xx_psc_ipcr); 942 /* enable CTS and DCD as IPC interrupts */ 943 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD); 944 945 port->read_status_mask |= MPC52xx_PSC_IMR_IPC; 946 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask); 947 } 948 949 static void mpc5125_psc_set_sicr(struct uart_port *port, u32 val) 950 { 951 out_be32(&PSC_5125(port)->sicr, val); 952 } 953 954 static void mpc5125_psc_set_imr(struct uart_port *port, u16 val) 955 { 956 out_be16(&PSC_5125(port)->mpc52xx_psc_imr, val); 957 } 958 959 static u8 mpc5125_psc_get_mr1(struct uart_port *port) 960 { 961 return in_8(&PSC_5125(port)->mr1); 962 } 963 964 static const struct psc_ops mpc5125_psc_ops = { 965 .fifo_init = mpc5125_psc_fifo_init, 966 .raw_rx_rdy = mpc5125_psc_raw_rx_rdy, 967 .raw_tx_rdy = mpc5125_psc_raw_tx_rdy, 968 .rx_rdy = mpc5125_psc_rx_rdy, 969 .tx_rdy = mpc5125_psc_tx_rdy, 970 .tx_empty = mpc5125_psc_tx_empty, 971 .stop_rx = mpc5125_psc_stop_rx, 972 .start_tx = mpc5125_psc_start_tx, 973 .stop_tx = mpc5125_psc_stop_tx, 974 .rx_clr_irq = mpc5125_psc_rx_clr_irq, 975 .tx_clr_irq = mpc5125_psc_tx_clr_irq, 976 .write_char = mpc5125_psc_write_char, 977 .read_char = mpc5125_psc_read_char, 978 .cw_disable_ints = mpc5125_psc_cw_disable_ints, 979 .cw_restore_ints = mpc5125_psc_cw_restore_ints, 980 .set_baudrate = mpc5125_psc_set_baudrate, 981 .clock_alloc = mpc512x_psc_alloc_clock, 982 .clock_relse = mpc512x_psc_relse_clock, 983 .clock = mpc512x_psc_endis_clock, 984 .fifoc_init = mpc512x_psc_fifoc_init, 985 .fifoc_uninit = mpc512x_psc_fifoc_uninit, 986 .get_irq = mpc512x_psc_get_irq, 987 .handle_irq = mpc512x_psc_handle_irq, 988 .get_status = mpc5125_psc_get_status, 989 .get_ipcr = mpc5125_psc_get_ipcr, 990 .command = mpc5125_psc_command, 991 .set_mode = mpc5125_psc_set_mode, 992 .set_rts = mpc5125_psc_set_rts, 993 .enable_ms = mpc5125_psc_enable_ms, 994 .set_sicr = mpc5125_psc_set_sicr, 995 .set_imr = mpc5125_psc_set_imr, 996 .get_mr1 = mpc5125_psc_get_mr1, 997 }; 998 999 static const struct psc_ops mpc512x_psc_ops = { 1000 .fifo_init = mpc512x_psc_fifo_init, 1001 .raw_rx_rdy = mpc512x_psc_raw_rx_rdy, 1002 .raw_tx_rdy = mpc512x_psc_raw_tx_rdy, 1003 .rx_rdy = mpc512x_psc_rx_rdy, 1004 .tx_rdy = mpc512x_psc_tx_rdy, 1005 .tx_empty = mpc512x_psc_tx_empty, 1006 .stop_rx = mpc512x_psc_stop_rx, 1007 .start_tx = mpc512x_psc_start_tx, 1008 .stop_tx = mpc512x_psc_stop_tx, 1009 .rx_clr_irq = mpc512x_psc_rx_clr_irq, 1010 .tx_clr_irq = mpc512x_psc_tx_clr_irq, 1011 .write_char = mpc512x_psc_write_char, 1012 .read_char = mpc512x_psc_read_char, 1013 .cw_disable_ints = mpc512x_psc_cw_disable_ints, 1014 .cw_restore_ints = mpc512x_psc_cw_restore_ints, 1015 .set_baudrate = mpc512x_psc_set_baudrate, 1016 .clock_alloc = mpc512x_psc_alloc_clock, 1017 .clock_relse = mpc512x_psc_relse_clock, 1018 .clock = mpc512x_psc_endis_clock, 1019 .fifoc_init = mpc512x_psc_fifoc_init, 1020 .fifoc_uninit = mpc512x_psc_fifoc_uninit, 1021 .get_irq = mpc512x_psc_get_irq, 1022 .handle_irq = mpc512x_psc_handle_irq, 1023 .get_status = mpc52xx_psc_get_status, 1024 .get_ipcr = mpc52xx_psc_get_ipcr, 1025 .command = mpc52xx_psc_command, 1026 .set_mode = mpc52xx_psc_set_mode, 1027 .set_rts = mpc52xx_psc_set_rts, 1028 .enable_ms = mpc52xx_psc_enable_ms, 1029 .set_sicr = mpc52xx_psc_set_sicr, 1030 .set_imr = mpc52xx_psc_set_imr, 1031 .get_mr1 = mpc52xx_psc_get_mr1, 1032 }; 1033 #endif /* CONFIG_PPC_MPC512x */ 1034 1035 1036 static const struct psc_ops *psc_ops; 1037 1038 /* ======================================================================== */ 1039 /* UART operations */ 1040 /* ======================================================================== */ 1041 1042 static unsigned int 1043 mpc52xx_uart_tx_empty(struct uart_port *port) 1044 { 1045 return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0; 1046 } 1047 1048 static void 1049 mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) 1050 { 1051 psc_ops->set_rts(port, mctrl & TIOCM_RTS); 1052 } 1053 1054 static unsigned int 1055 mpc52xx_uart_get_mctrl(struct uart_port *port) 1056 { 1057 unsigned int ret = TIOCM_DSR; 1058 u8 status = psc_ops->get_ipcr(port); 1059 1060 if (!(status & MPC52xx_PSC_CTS)) 1061 ret |= TIOCM_CTS; 1062 if (!(status & MPC52xx_PSC_DCD)) 1063 ret |= TIOCM_CAR; 1064 1065 return ret; 1066 } 1067 1068 static void 1069 mpc52xx_uart_stop_tx(struct uart_port *port) 1070 { 1071 /* port->lock taken by caller */ 1072 psc_ops->stop_tx(port); 1073 } 1074 1075 static void 1076 mpc52xx_uart_start_tx(struct uart_port *port) 1077 { 1078 /* port->lock taken by caller */ 1079 psc_ops->start_tx(port); 1080 } 1081 1082 static void 1083 mpc52xx_uart_stop_rx(struct uart_port *port) 1084 { 1085 /* port->lock taken by caller */ 1086 psc_ops->stop_rx(port); 1087 } 1088 1089 static void 1090 mpc52xx_uart_enable_ms(struct uart_port *port) 1091 { 1092 psc_ops->enable_ms(port); 1093 } 1094 1095 static void 1096 mpc52xx_uart_break_ctl(struct uart_port *port, int ctl) 1097 { 1098 unsigned long flags; 1099 spin_lock_irqsave(&port->lock, flags); 1100 1101 if (ctl == -1) 1102 psc_ops->command(port, MPC52xx_PSC_START_BRK); 1103 else 1104 psc_ops->command(port, MPC52xx_PSC_STOP_BRK); 1105 1106 spin_unlock_irqrestore(&port->lock, flags); 1107 } 1108 1109 static int 1110 mpc52xx_uart_startup(struct uart_port *port) 1111 { 1112 int ret; 1113 1114 if (psc_ops->clock) { 1115 ret = psc_ops->clock(port, 1); 1116 if (ret) 1117 return ret; 1118 } 1119 1120 /* Request IRQ */ 1121 ret = request_irq(port->irq, mpc52xx_uart_int, 1122 port->irqflags, "mpc52xx_psc_uart", port); 1123 if (ret) 1124 return ret; 1125 1126 /* Reset/activate the port, clear and enable interrupts */ 1127 psc_ops->command(port, MPC52xx_PSC_RST_RX); 1128 psc_ops->command(port, MPC52xx_PSC_RST_TX); 1129 1130 /* 1131 * According to Freescale's support the RST_TX command can produce a 1132 * spike on the TX pin. So they recommend to delay "for one character". 1133 * One millisecond should be enough for everyone. 1134 */ 1135 msleep(1); 1136 1137 psc_ops->set_sicr(port, 0); /* UART mode DCD ignored */ 1138 1139 psc_ops->fifo_init(port); 1140 1141 psc_ops->command(port, MPC52xx_PSC_TX_ENABLE); 1142 psc_ops->command(port, MPC52xx_PSC_RX_ENABLE); 1143 1144 return 0; 1145 } 1146 1147 static void 1148 mpc52xx_uart_shutdown(struct uart_port *port) 1149 { 1150 /* Shut down the port. Leave TX active if on a console port */ 1151 psc_ops->command(port, MPC52xx_PSC_RST_RX); 1152 if (!uart_console(port)) 1153 psc_ops->command(port, MPC52xx_PSC_RST_TX); 1154 1155 port->read_status_mask = 0; 1156 psc_ops->set_imr(port, port->read_status_mask); 1157 1158 if (psc_ops->clock) 1159 psc_ops->clock(port, 0); 1160 1161 /* Disable interrupt */ 1162 psc_ops->cw_disable_ints(port); 1163 1164 /* Release interrupt */ 1165 free_irq(port->irq, port); 1166 } 1167 1168 static void 1169 mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new, 1170 struct ktermios *old) 1171 { 1172 unsigned long flags; 1173 unsigned char mr1, mr2; 1174 unsigned int j; 1175 unsigned int baud; 1176 1177 /* Prepare what we're gonna write */ 1178 mr1 = 0; 1179 1180 switch (new->c_cflag & CSIZE) { 1181 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS; 1182 break; 1183 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS; 1184 break; 1185 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS; 1186 break; 1187 case CS8: 1188 default: mr1 |= MPC52xx_PSC_MODE_8_BITS; 1189 } 1190 1191 if (new->c_cflag & PARENB) { 1192 if (new->c_cflag & CMSPAR) 1193 mr1 |= MPC52xx_PSC_MODE_PARFORCE; 1194 1195 /* With CMSPAR, PARODD also means high parity (same as termios) */ 1196 mr1 |= (new->c_cflag & PARODD) ? 1197 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN; 1198 } else { 1199 mr1 |= MPC52xx_PSC_MODE_PARNONE; 1200 } 1201 1202 mr2 = 0; 1203 1204 if (new->c_cflag & CSTOPB) 1205 mr2 |= MPC52xx_PSC_MODE_TWO_STOP; 1206 else 1207 mr2 |= ((new->c_cflag & CSIZE) == CS5) ? 1208 MPC52xx_PSC_MODE_ONE_STOP_5_BITS : 1209 MPC52xx_PSC_MODE_ONE_STOP; 1210 1211 if (new->c_cflag & CRTSCTS) { 1212 mr1 |= MPC52xx_PSC_MODE_RXRTS; 1213 mr2 |= MPC52xx_PSC_MODE_TXCTS; 1214 } 1215 1216 /* Get the lock */ 1217 spin_lock_irqsave(&port->lock, flags); 1218 1219 /* Do our best to flush TX & RX, so we don't lose anything */ 1220 /* But we don't wait indefinitely ! */ 1221 j = 5000000; /* Maximum wait */ 1222 /* FIXME Can't receive chars since set_termios might be called at early 1223 * boot for the console, all stuff is not yet ready to receive at that 1224 * time and that just makes the kernel oops */ 1225 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */ 1226 while (!mpc52xx_uart_tx_empty(port) && --j) 1227 udelay(1); 1228 1229 if (!j) 1230 printk(KERN_ERR "mpc52xx_uart.c: " 1231 "Unable to flush RX & TX fifos in-time in set_termios." 1232 "Some chars may have been lost.\n"); 1233 1234 /* Reset the TX & RX */ 1235 psc_ops->command(port, MPC52xx_PSC_RST_RX); 1236 psc_ops->command(port, MPC52xx_PSC_RST_TX); 1237 1238 /* Send new mode settings */ 1239 psc_ops->set_mode(port, mr1, mr2); 1240 baud = psc_ops->set_baudrate(port, new, old); 1241 1242 /* Update the per-port timeout */ 1243 uart_update_timeout(port, new->c_cflag, baud); 1244 1245 if (UART_ENABLE_MS(port, new->c_cflag)) 1246 mpc52xx_uart_enable_ms(port); 1247 1248 /* Reenable TX & RX */ 1249 psc_ops->command(port, MPC52xx_PSC_TX_ENABLE); 1250 psc_ops->command(port, MPC52xx_PSC_RX_ENABLE); 1251 1252 /* We're all set, release the lock */ 1253 spin_unlock_irqrestore(&port->lock, flags); 1254 } 1255 1256 static const char * 1257 mpc52xx_uart_type(struct uart_port *port) 1258 { 1259 /* 1260 * We keep using PORT_MPC52xx for historic reasons although it applies 1261 * for MPC512x, too, but print "MPC5xxx" to not irritate users 1262 */ 1263 return port->type == PORT_MPC52xx ? "MPC5xxx PSC" : NULL; 1264 } 1265 1266 static void 1267 mpc52xx_uart_release_port(struct uart_port *port) 1268 { 1269 if (psc_ops->clock_relse) 1270 psc_ops->clock_relse(port); 1271 1272 /* remapped by us ? */ 1273 if (port->flags & UPF_IOREMAP) { 1274 iounmap(port->membase); 1275 port->membase = NULL; 1276 } 1277 1278 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc)); 1279 } 1280 1281 static int 1282 mpc52xx_uart_request_port(struct uart_port *port) 1283 { 1284 int err; 1285 1286 if (port->flags & UPF_IOREMAP) /* Need to remap ? */ 1287 port->membase = ioremap(port->mapbase, 1288 sizeof(struct mpc52xx_psc)); 1289 1290 if (!port->membase) 1291 return -EINVAL; 1292 1293 err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc), 1294 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY; 1295 1296 if (err) 1297 goto out_membase; 1298 1299 if (psc_ops->clock_alloc) { 1300 err = psc_ops->clock_alloc(port); 1301 if (err) 1302 goto out_mapregion; 1303 } 1304 1305 return 0; 1306 1307 out_mapregion: 1308 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc)); 1309 out_membase: 1310 if (port->flags & UPF_IOREMAP) { 1311 iounmap(port->membase); 1312 port->membase = NULL; 1313 } 1314 return err; 1315 } 1316 1317 static void 1318 mpc52xx_uart_config_port(struct uart_port *port, int flags) 1319 { 1320 if ((flags & UART_CONFIG_TYPE) 1321 && (mpc52xx_uart_request_port(port) == 0)) 1322 port->type = PORT_MPC52xx; 1323 } 1324 1325 static int 1326 mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser) 1327 { 1328 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx) 1329 return -EINVAL; 1330 1331 if ((ser->irq != port->irq) || 1332 (ser->io_type != UPIO_MEM) || 1333 (ser->baud_base != port->uartclk) || 1334 (ser->iomem_base != (void *)port->mapbase) || 1335 (ser->hub6 != 0)) 1336 return -EINVAL; 1337 1338 return 0; 1339 } 1340 1341 1342 static const struct uart_ops mpc52xx_uart_ops = { 1343 .tx_empty = mpc52xx_uart_tx_empty, 1344 .set_mctrl = mpc52xx_uart_set_mctrl, 1345 .get_mctrl = mpc52xx_uart_get_mctrl, 1346 .stop_tx = mpc52xx_uart_stop_tx, 1347 .start_tx = mpc52xx_uart_start_tx, 1348 .stop_rx = mpc52xx_uart_stop_rx, 1349 .enable_ms = mpc52xx_uart_enable_ms, 1350 .break_ctl = mpc52xx_uart_break_ctl, 1351 .startup = mpc52xx_uart_startup, 1352 .shutdown = mpc52xx_uart_shutdown, 1353 .set_termios = mpc52xx_uart_set_termios, 1354 /* .pm = mpc52xx_uart_pm, Not supported yet */ 1355 .type = mpc52xx_uart_type, 1356 .release_port = mpc52xx_uart_release_port, 1357 .request_port = mpc52xx_uart_request_port, 1358 .config_port = mpc52xx_uart_config_port, 1359 .verify_port = mpc52xx_uart_verify_port 1360 }; 1361 1362 1363 /* ======================================================================== */ 1364 /* Interrupt handling */ 1365 /* ======================================================================== */ 1366 1367 static inline unsigned int 1368 mpc52xx_uart_int_rx_chars(struct uart_port *port) 1369 { 1370 struct tty_port *tport = &port->state->port; 1371 unsigned char ch, flag; 1372 unsigned short status; 1373 1374 /* While we can read, do so ! */ 1375 while (psc_ops->raw_rx_rdy(port)) { 1376 /* Get the char */ 1377 ch = psc_ops->read_char(port); 1378 1379 /* Handle sysreq char */ 1380 if (uart_handle_sysrq_char(port, ch)) 1381 continue; 1382 1383 /* Store it */ 1384 1385 flag = TTY_NORMAL; 1386 port->icount.rx++; 1387 1388 status = psc_ops->get_status(port); 1389 1390 if (status & (MPC52xx_PSC_SR_PE | 1391 MPC52xx_PSC_SR_FE | 1392 MPC52xx_PSC_SR_RB)) { 1393 1394 if (status & MPC52xx_PSC_SR_RB) { 1395 flag = TTY_BREAK; 1396 uart_handle_break(port); 1397 port->icount.brk++; 1398 } else if (status & MPC52xx_PSC_SR_PE) { 1399 flag = TTY_PARITY; 1400 port->icount.parity++; 1401 } 1402 else if (status & MPC52xx_PSC_SR_FE) { 1403 flag = TTY_FRAME; 1404 port->icount.frame++; 1405 } 1406 1407 /* Clear error condition */ 1408 psc_ops->command(port, MPC52xx_PSC_RST_ERR_STAT); 1409 1410 } 1411 tty_insert_flip_char(tport, ch, flag); 1412 if (status & MPC52xx_PSC_SR_OE) { 1413 /* 1414 * Overrun is special, since it's 1415 * reported immediately, and doesn't 1416 * affect the current character 1417 */ 1418 tty_insert_flip_char(tport, 0, TTY_OVERRUN); 1419 port->icount.overrun++; 1420 } 1421 } 1422 1423 tty_flip_buffer_push(tport); 1424 1425 return psc_ops->raw_rx_rdy(port); 1426 } 1427 1428 static inline int 1429 mpc52xx_uart_int_tx_chars(struct uart_port *port) 1430 { 1431 struct circ_buf *xmit = &port->state->xmit; 1432 1433 /* Process out of band chars */ 1434 if (port->x_char) { 1435 psc_ops->write_char(port, port->x_char); 1436 port->icount.tx++; 1437 port->x_char = 0; 1438 return 1; 1439 } 1440 1441 /* Nothing to do ? */ 1442 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { 1443 mpc52xx_uart_stop_tx(port); 1444 return 0; 1445 } 1446 1447 /* Send chars */ 1448 while (psc_ops->raw_tx_rdy(port)) { 1449 psc_ops->write_char(port, xmit->buf[xmit->tail]); 1450 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 1451 port->icount.tx++; 1452 if (uart_circ_empty(xmit)) 1453 break; 1454 } 1455 1456 /* Wake up */ 1457 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 1458 uart_write_wakeup(port); 1459 1460 /* Maybe we're done after all */ 1461 if (uart_circ_empty(xmit)) { 1462 mpc52xx_uart_stop_tx(port); 1463 return 0; 1464 } 1465 1466 return 1; 1467 } 1468 1469 static irqreturn_t 1470 mpc5xxx_uart_process_int(struct uart_port *port) 1471 { 1472 unsigned long pass = ISR_PASS_LIMIT; 1473 unsigned int keepgoing; 1474 u8 status; 1475 1476 /* While we have stuff to do, we continue */ 1477 do { 1478 /* If we don't find anything to do, we stop */ 1479 keepgoing = 0; 1480 1481 psc_ops->rx_clr_irq(port); 1482 if (psc_ops->rx_rdy(port)) 1483 keepgoing |= mpc52xx_uart_int_rx_chars(port); 1484 1485 psc_ops->tx_clr_irq(port); 1486 if (psc_ops->tx_rdy(port)) 1487 keepgoing |= mpc52xx_uart_int_tx_chars(port); 1488 1489 status = psc_ops->get_ipcr(port); 1490 if (status & MPC52xx_PSC_D_DCD) 1491 uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD)); 1492 1493 if (status & MPC52xx_PSC_D_CTS) 1494 uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS)); 1495 1496 /* Limit number of iteration */ 1497 if (!(--pass)) 1498 keepgoing = 0; 1499 1500 } while (keepgoing); 1501 1502 return IRQ_HANDLED; 1503 } 1504 1505 static irqreturn_t 1506 mpc52xx_uart_int(int irq, void *dev_id) 1507 { 1508 struct uart_port *port = dev_id; 1509 irqreturn_t ret; 1510 1511 spin_lock(&port->lock); 1512 1513 ret = psc_ops->handle_irq(port); 1514 1515 spin_unlock(&port->lock); 1516 1517 return ret; 1518 } 1519 1520 /* ======================================================================== */ 1521 /* Console ( if applicable ) */ 1522 /* ======================================================================== */ 1523 1524 #ifdef CONFIG_SERIAL_MPC52xx_CONSOLE 1525 1526 static void __init 1527 mpc52xx_console_get_options(struct uart_port *port, 1528 int *baud, int *parity, int *bits, int *flow) 1529 { 1530 unsigned char mr1; 1531 1532 pr_debug("mpc52xx_console_get_options(port=%p)\n", port); 1533 1534 /* Read the mode registers */ 1535 mr1 = psc_ops->get_mr1(port); 1536 1537 /* CT{U,L}R are write-only ! */ 1538 *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD; 1539 1540 /* Parse them */ 1541 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) { 1542 case MPC52xx_PSC_MODE_5_BITS: 1543 *bits = 5; 1544 break; 1545 case MPC52xx_PSC_MODE_6_BITS: 1546 *bits = 6; 1547 break; 1548 case MPC52xx_PSC_MODE_7_BITS: 1549 *bits = 7; 1550 break; 1551 case MPC52xx_PSC_MODE_8_BITS: 1552 default: 1553 *bits = 8; 1554 } 1555 1556 if (mr1 & MPC52xx_PSC_MODE_PARNONE) 1557 *parity = 'n'; 1558 else 1559 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e'; 1560 } 1561 1562 static void 1563 mpc52xx_console_write(struct console *co, const char *s, unsigned int count) 1564 { 1565 struct uart_port *port = &mpc52xx_uart_ports[co->index]; 1566 unsigned int i, j; 1567 1568 /* Disable interrupts */ 1569 psc_ops->cw_disable_ints(port); 1570 1571 /* Wait the TX buffer to be empty */ 1572 j = 5000000; /* Maximum wait */ 1573 while (!mpc52xx_uart_tx_empty(port) && --j) 1574 udelay(1); 1575 1576 /* Write all the chars */ 1577 for (i = 0; i < count; i++, s++) { 1578 /* Line return handling */ 1579 if (*s == '\n') 1580 psc_ops->write_char(port, '\r'); 1581 1582 /* Send the char */ 1583 psc_ops->write_char(port, *s); 1584 1585 /* Wait the TX buffer to be empty */ 1586 j = 20000; /* Maximum wait */ 1587 while (!mpc52xx_uart_tx_empty(port) && --j) 1588 udelay(1); 1589 } 1590 1591 /* Restore interrupt state */ 1592 psc_ops->cw_restore_ints(port); 1593 } 1594 1595 1596 static int __init 1597 mpc52xx_console_setup(struct console *co, char *options) 1598 { 1599 struct uart_port *port = &mpc52xx_uart_ports[co->index]; 1600 struct device_node *np = mpc52xx_uart_nodes[co->index]; 1601 unsigned int uartclk; 1602 struct resource res; 1603 int ret; 1604 1605 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD; 1606 int bits = 8; 1607 int parity = 'n'; 1608 int flow = 'n'; 1609 1610 pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n", 1611 co, co->index, options); 1612 1613 if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) { 1614 pr_debug("PSC%x out of range\n", co->index); 1615 return -EINVAL; 1616 } 1617 1618 if (!np) { 1619 pr_debug("PSC%x not found in device tree\n", co->index); 1620 return -EINVAL; 1621 } 1622 1623 pr_debug("Console on ttyPSC%x is %pOF\n", 1624 co->index, mpc52xx_uart_nodes[co->index]); 1625 1626 /* Fetch register locations */ 1627 ret = of_address_to_resource(np, 0, &res); 1628 if (ret) { 1629 pr_debug("Could not get resources for PSC%x\n", co->index); 1630 return ret; 1631 } 1632 1633 uartclk = mpc5xxx_get_bus_frequency(np); 1634 if (uartclk == 0) { 1635 pr_debug("Could not find uart clock frequency!\n"); 1636 return -EINVAL; 1637 } 1638 1639 /* Basic port init. Needed since we use some uart_??? func before 1640 * real init for early access */ 1641 spin_lock_init(&port->lock); 1642 port->uartclk = uartclk; 1643 port->ops = &mpc52xx_uart_ops; 1644 port->mapbase = res.start; 1645 port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc)); 1646 port->irq = irq_of_parse_and_map(np, 0); 1647 1648 if (port->membase == NULL) 1649 return -EINVAL; 1650 1651 pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n", 1652 (void *)port->mapbase, port->membase, 1653 port->irq, port->uartclk); 1654 1655 /* Setup the port parameters accoding to options */ 1656 if (options) 1657 uart_parse_options(options, &baud, &parity, &bits, &flow); 1658 else 1659 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow); 1660 1661 pr_debug("Setting console parameters: %i %i%c1 flow=%c\n", 1662 baud, bits, parity, flow); 1663 1664 return uart_set_options(port, co, baud, parity, bits, flow); 1665 } 1666 1667 1668 static struct uart_driver mpc52xx_uart_driver; 1669 1670 static struct console mpc52xx_console = { 1671 .name = "ttyPSC", 1672 .write = mpc52xx_console_write, 1673 .device = uart_console_device, 1674 .setup = mpc52xx_console_setup, 1675 .flags = CON_PRINTBUFFER, 1676 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */ 1677 .data = &mpc52xx_uart_driver, 1678 }; 1679 1680 1681 static int __init 1682 mpc52xx_console_init(void) 1683 { 1684 mpc52xx_uart_of_enumerate(); 1685 register_console(&mpc52xx_console); 1686 return 0; 1687 } 1688 1689 console_initcall(mpc52xx_console_init); 1690 1691 #define MPC52xx_PSC_CONSOLE &mpc52xx_console 1692 #else 1693 #define MPC52xx_PSC_CONSOLE NULL 1694 #endif 1695 1696 1697 /* ======================================================================== */ 1698 /* UART Driver */ 1699 /* ======================================================================== */ 1700 1701 static struct uart_driver mpc52xx_uart_driver = { 1702 .driver_name = "mpc52xx_psc_uart", 1703 .dev_name = "ttyPSC", 1704 .major = SERIAL_PSC_MAJOR, 1705 .minor = SERIAL_PSC_MINOR, 1706 .nr = MPC52xx_PSC_MAXNUM, 1707 .cons = MPC52xx_PSC_CONSOLE, 1708 }; 1709 1710 /* ======================================================================== */ 1711 /* OF Platform Driver */ 1712 /* ======================================================================== */ 1713 1714 static const struct of_device_id mpc52xx_uart_of_match[] = { 1715 #ifdef CONFIG_PPC_MPC52xx 1716 { .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, }, 1717 { .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, }, 1718 /* binding used by old lite5200 device trees: */ 1719 { .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, }, 1720 /* binding used by efika: */ 1721 { .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, }, 1722 #endif 1723 #ifdef CONFIG_PPC_MPC512x 1724 { .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, }, 1725 { .compatible = "fsl,mpc5125-psc-uart", .data = &mpc5125_psc_ops, }, 1726 #endif 1727 {}, 1728 }; 1729 1730 static int mpc52xx_uart_of_probe(struct platform_device *op) 1731 { 1732 int idx = -1; 1733 unsigned int uartclk; 1734 struct uart_port *port = NULL; 1735 struct resource res; 1736 int ret; 1737 1738 /* Check validity & presence */ 1739 for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++) 1740 if (mpc52xx_uart_nodes[idx] == op->dev.of_node) 1741 break; 1742 if (idx >= MPC52xx_PSC_MAXNUM) 1743 return -EINVAL; 1744 pr_debug("Found %pOF assigned to ttyPSC%x\n", 1745 mpc52xx_uart_nodes[idx], idx); 1746 1747 /* set the uart clock to the input clock of the psc, the different 1748 * prescalers are taken into account in the set_baudrate() methods 1749 * of the respective chip */ 1750 uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node); 1751 if (uartclk == 0) { 1752 dev_dbg(&op->dev, "Could not find uart clock frequency!\n"); 1753 return -EINVAL; 1754 } 1755 1756 /* Init the port structure */ 1757 port = &mpc52xx_uart_ports[idx]; 1758 1759 spin_lock_init(&port->lock); 1760 port->uartclk = uartclk; 1761 port->fifosize = 512; 1762 port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_MPC52xx_CONSOLE); 1763 port->iotype = UPIO_MEM; 1764 port->flags = UPF_BOOT_AUTOCONF | 1765 (uart_console(port) ? 0 : UPF_IOREMAP); 1766 port->line = idx; 1767 port->ops = &mpc52xx_uart_ops; 1768 port->dev = &op->dev; 1769 1770 /* Search for IRQ and mapbase */ 1771 ret = of_address_to_resource(op->dev.of_node, 0, &res); 1772 if (ret) 1773 return ret; 1774 1775 port->mapbase = res.start; 1776 if (!port->mapbase) { 1777 dev_dbg(&op->dev, "Could not allocate resources for PSC\n"); 1778 return -EINVAL; 1779 } 1780 1781 psc_ops->get_irq(port, op->dev.of_node); 1782 if (port->irq == 0) { 1783 dev_dbg(&op->dev, "Could not get irq\n"); 1784 return -EINVAL; 1785 } 1786 1787 dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n", 1788 (void *)port->mapbase, port->irq, port->uartclk); 1789 1790 /* Add the port to the uart sub-system */ 1791 ret = uart_add_one_port(&mpc52xx_uart_driver, port); 1792 if (ret) 1793 return ret; 1794 1795 platform_set_drvdata(op, (void *)port); 1796 return 0; 1797 } 1798 1799 static int 1800 mpc52xx_uart_of_remove(struct platform_device *op) 1801 { 1802 struct uart_port *port = platform_get_drvdata(op); 1803 1804 if (port) 1805 uart_remove_one_port(&mpc52xx_uart_driver, port); 1806 1807 return 0; 1808 } 1809 1810 #ifdef CONFIG_PM 1811 static int 1812 mpc52xx_uart_of_suspend(struct platform_device *op, pm_message_t state) 1813 { 1814 struct uart_port *port = platform_get_drvdata(op); 1815 1816 if (port) 1817 uart_suspend_port(&mpc52xx_uart_driver, port); 1818 1819 return 0; 1820 } 1821 1822 static int 1823 mpc52xx_uart_of_resume(struct platform_device *op) 1824 { 1825 struct uart_port *port = platform_get_drvdata(op); 1826 1827 if (port) 1828 uart_resume_port(&mpc52xx_uart_driver, port); 1829 1830 return 0; 1831 } 1832 #endif 1833 1834 static void 1835 mpc52xx_uart_of_assign(struct device_node *np) 1836 { 1837 int i; 1838 1839 /* Find the first free PSC number */ 1840 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) { 1841 if (mpc52xx_uart_nodes[i] == NULL) { 1842 of_node_get(np); 1843 mpc52xx_uart_nodes[i] = np; 1844 return; 1845 } 1846 } 1847 } 1848 1849 static void 1850 mpc52xx_uart_of_enumerate(void) 1851 { 1852 static int enum_done; 1853 struct device_node *np; 1854 const struct of_device_id *match; 1855 int i; 1856 1857 if (enum_done) 1858 return; 1859 1860 /* Assign index to each PSC in device tree */ 1861 for_each_matching_node(np, mpc52xx_uart_of_match) { 1862 match = of_match_node(mpc52xx_uart_of_match, np); 1863 psc_ops = match->data; 1864 mpc52xx_uart_of_assign(np); 1865 } 1866 1867 enum_done = 1; 1868 1869 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) { 1870 if (mpc52xx_uart_nodes[i]) 1871 pr_debug("%pOF assigned to ttyPSC%x\n", 1872 mpc52xx_uart_nodes[i], i); 1873 } 1874 } 1875 1876 MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match); 1877 1878 static struct platform_driver mpc52xx_uart_of_driver = { 1879 .probe = mpc52xx_uart_of_probe, 1880 .remove = mpc52xx_uart_of_remove, 1881 #ifdef CONFIG_PM 1882 .suspend = mpc52xx_uart_of_suspend, 1883 .resume = mpc52xx_uart_of_resume, 1884 #endif 1885 .driver = { 1886 .name = "mpc52xx-psc-uart", 1887 .of_match_table = mpc52xx_uart_of_match, 1888 }, 1889 }; 1890 1891 1892 /* ======================================================================== */ 1893 /* Module */ 1894 /* ======================================================================== */ 1895 1896 static int __init 1897 mpc52xx_uart_init(void) 1898 { 1899 int ret; 1900 1901 printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n"); 1902 1903 ret = uart_register_driver(&mpc52xx_uart_driver); 1904 if (ret) { 1905 printk(KERN_ERR "%s: uart_register_driver failed (%i)\n", 1906 __FILE__, ret); 1907 return ret; 1908 } 1909 1910 mpc52xx_uart_of_enumerate(); 1911 1912 /* 1913 * Map the PSC FIFO Controller and init if on MPC512x. 1914 */ 1915 if (psc_ops && psc_ops->fifoc_init) { 1916 ret = psc_ops->fifoc_init(); 1917 if (ret) 1918 goto err_init; 1919 } 1920 1921 ret = platform_driver_register(&mpc52xx_uart_of_driver); 1922 if (ret) { 1923 printk(KERN_ERR "%s: platform_driver_register failed (%i)\n", 1924 __FILE__, ret); 1925 goto err_reg; 1926 } 1927 1928 return 0; 1929 err_reg: 1930 if (psc_ops && psc_ops->fifoc_uninit) 1931 psc_ops->fifoc_uninit(); 1932 err_init: 1933 uart_unregister_driver(&mpc52xx_uart_driver); 1934 return ret; 1935 } 1936 1937 static void __exit 1938 mpc52xx_uart_exit(void) 1939 { 1940 if (psc_ops->fifoc_uninit) 1941 psc_ops->fifoc_uninit(); 1942 1943 platform_driver_unregister(&mpc52xx_uart_of_driver); 1944 uart_unregister_driver(&mpc52xx_uart_driver); 1945 } 1946 1947 1948 module_init(mpc52xx_uart_init); 1949 module_exit(mpc52xx_uart_exit); 1950 1951 MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>"); 1952 MODULE_DESCRIPTION("Freescale MPC52xx PSC UART"); 1953 MODULE_LICENSE("GPL"); 1954