1 /* 2 * Driver for Comtrol RocketPort EXPRESS/INFINITY cards 3 * 4 * Copyright (C) 2012 Kevin Cernekee <cernekee@gmail.com> 5 * 6 * Inspired by, and loosely based on: 7 * 8 * ar933x_uart.c 9 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org> 10 * 11 * rocketport_infinity_express-linux-1.20.tar.gz 12 * Copyright (C) 2004-2011 Comtrol, Inc. 13 * 14 * This program is free software; you can redistribute it and/or modify it 15 * under the terms of the GNU General Public License version 2 as published 16 * by the Free Software Foundation. 17 */ 18 19 #include <linux/bitops.h> 20 #include <linux/compiler.h> 21 #include <linux/completion.h> 22 #include <linux/console.h> 23 #include <linux/delay.h> 24 #include <linux/firmware.h> 25 #include <linux/init.h> 26 #include <linux/io.h> 27 #include <linux/ioport.h> 28 #include <linux/irq.h> 29 #include <linux/kernel.h> 30 #include <linux/log2.h> 31 #include <linux/module.h> 32 #include <linux/pci.h> 33 #include <linux/serial.h> 34 #include <linux/serial_core.h> 35 #include <linux/slab.h> 36 #include <linux/sysrq.h> 37 #include <linux/tty.h> 38 #include <linux/tty_flip.h> 39 #include <linux/types.h> 40 41 #define DRV_NAME "rp2" 42 43 #define RP2_FW_NAME "rp2.fw" 44 #define RP2_UCODE_BYTES 0x3f 45 46 #define PORTS_PER_ASIC 16 47 #define ALL_PORTS_MASK (BIT(PORTS_PER_ASIC) - 1) 48 49 #define UART_CLOCK 44236800 50 #define DEFAULT_BAUD_DIV (UART_CLOCK / (9600 * 16)) 51 #define FIFO_SIZE 512 52 53 /* BAR0 registers */ 54 #define RP2_FPGA_CTL0 0x110 55 #define RP2_FPGA_CTL1 0x11c 56 #define RP2_IRQ_MASK 0x1ec 57 #define RP2_IRQ_MASK_EN_m BIT(0) 58 #define RP2_IRQ_STATUS 0x1f0 59 60 /* BAR1 registers */ 61 #define RP2_ASIC_SPACING 0x1000 62 #define RP2_ASIC_OFFSET(i) ((i) << ilog2(RP2_ASIC_SPACING)) 63 64 #define RP2_PORT_BASE 0x000 65 #define RP2_PORT_SPACING 0x040 66 67 #define RP2_UCODE_BASE 0x400 68 #define RP2_UCODE_SPACING 0x80 69 70 #define RP2_CLK_PRESCALER 0xc00 71 #define RP2_CH_IRQ_STAT 0xc04 72 #define RP2_CH_IRQ_MASK 0xc08 73 #define RP2_ASIC_IRQ 0xd00 74 #define RP2_ASIC_IRQ_EN_m BIT(20) 75 #define RP2_GLOBAL_CMD 0xd0c 76 #define RP2_ASIC_CFG 0xd04 77 78 /* port registers */ 79 #define RP2_DATA_DWORD 0x000 80 81 #define RP2_DATA_BYTE 0x008 82 #define RP2_DATA_BYTE_ERR_PARITY_m BIT(8) 83 #define RP2_DATA_BYTE_ERR_OVERRUN_m BIT(9) 84 #define RP2_DATA_BYTE_ERR_FRAMING_m BIT(10) 85 #define RP2_DATA_BYTE_BREAK_m BIT(11) 86 87 /* This lets uart_insert_char() drop bytes received on a !CREAD port */ 88 #define RP2_DUMMY_READ BIT(16) 89 90 #define RP2_DATA_BYTE_EXCEPTION_MASK (RP2_DATA_BYTE_ERR_PARITY_m | \ 91 RP2_DATA_BYTE_ERR_OVERRUN_m | \ 92 RP2_DATA_BYTE_ERR_FRAMING_m | \ 93 RP2_DATA_BYTE_BREAK_m) 94 95 #define RP2_RX_FIFO_COUNT 0x00c 96 #define RP2_TX_FIFO_COUNT 0x00e 97 98 #define RP2_CHAN_STAT 0x010 99 #define RP2_CHAN_STAT_RXDATA_m BIT(0) 100 #define RP2_CHAN_STAT_DCD_m BIT(3) 101 #define RP2_CHAN_STAT_DSR_m BIT(4) 102 #define RP2_CHAN_STAT_CTS_m BIT(5) 103 #define RP2_CHAN_STAT_RI_m BIT(6) 104 #define RP2_CHAN_STAT_OVERRUN_m BIT(13) 105 #define RP2_CHAN_STAT_DSR_CHANGED_m BIT(16) 106 #define RP2_CHAN_STAT_CTS_CHANGED_m BIT(17) 107 #define RP2_CHAN_STAT_CD_CHANGED_m BIT(18) 108 #define RP2_CHAN_STAT_RI_CHANGED_m BIT(22) 109 #define RP2_CHAN_STAT_TXEMPTY_m BIT(25) 110 111 #define RP2_CHAN_STAT_MS_CHANGED_MASK (RP2_CHAN_STAT_DSR_CHANGED_m | \ 112 RP2_CHAN_STAT_CTS_CHANGED_m | \ 113 RP2_CHAN_STAT_CD_CHANGED_m | \ 114 RP2_CHAN_STAT_RI_CHANGED_m) 115 116 #define RP2_TXRX_CTL 0x014 117 #define RP2_TXRX_CTL_MSRIRQ_m BIT(0) 118 #define RP2_TXRX_CTL_RXIRQ_m BIT(2) 119 #define RP2_TXRX_CTL_RX_TRIG_s 3 120 #define RP2_TXRX_CTL_RX_TRIG_m (0x3 << RP2_TXRX_CTL_RX_TRIG_s) 121 #define RP2_TXRX_CTL_RX_TRIG_1 (0x1 << RP2_TXRX_CTL_RX_TRIG_s) 122 #define RP2_TXRX_CTL_RX_TRIG_256 (0x2 << RP2_TXRX_CTL_RX_TRIG_s) 123 #define RP2_TXRX_CTL_RX_TRIG_448 (0x3 << RP2_TXRX_CTL_RX_TRIG_s) 124 #define RP2_TXRX_CTL_RX_EN_m BIT(5) 125 #define RP2_TXRX_CTL_RTSFLOW_m BIT(6) 126 #define RP2_TXRX_CTL_DTRFLOW_m BIT(7) 127 #define RP2_TXRX_CTL_TX_TRIG_s 16 128 #define RP2_TXRX_CTL_TX_TRIG_m (0x3 << RP2_TXRX_CTL_RX_TRIG_s) 129 #define RP2_TXRX_CTL_DSRFLOW_m BIT(18) 130 #define RP2_TXRX_CTL_TXIRQ_m BIT(19) 131 #define RP2_TXRX_CTL_CTSFLOW_m BIT(23) 132 #define RP2_TXRX_CTL_TX_EN_m BIT(24) 133 #define RP2_TXRX_CTL_RTS_m BIT(25) 134 #define RP2_TXRX_CTL_DTR_m BIT(26) 135 #define RP2_TXRX_CTL_LOOP_m BIT(27) 136 #define RP2_TXRX_CTL_BREAK_m BIT(28) 137 #define RP2_TXRX_CTL_CMSPAR_m BIT(29) 138 #define RP2_TXRX_CTL_nPARODD_m BIT(30) 139 #define RP2_TXRX_CTL_PARENB_m BIT(31) 140 141 #define RP2_UART_CTL 0x018 142 #define RP2_UART_CTL_MODE_s 0 143 #define RP2_UART_CTL_MODE_m (0x7 << RP2_UART_CTL_MODE_s) 144 #define RP2_UART_CTL_MODE_rs232 (0x1 << RP2_UART_CTL_MODE_s) 145 #define RP2_UART_CTL_FLUSH_RX_m BIT(3) 146 #define RP2_UART_CTL_FLUSH_TX_m BIT(4) 147 #define RP2_UART_CTL_RESET_CH_m BIT(5) 148 #define RP2_UART_CTL_XMIT_EN_m BIT(6) 149 #define RP2_UART_CTL_DATABITS_s 8 150 #define RP2_UART_CTL_DATABITS_m (0x3 << RP2_UART_CTL_DATABITS_s) 151 #define RP2_UART_CTL_DATABITS_8 (0x3 << RP2_UART_CTL_DATABITS_s) 152 #define RP2_UART_CTL_DATABITS_7 (0x2 << RP2_UART_CTL_DATABITS_s) 153 #define RP2_UART_CTL_DATABITS_6 (0x1 << RP2_UART_CTL_DATABITS_s) 154 #define RP2_UART_CTL_DATABITS_5 (0x0 << RP2_UART_CTL_DATABITS_s) 155 #define RP2_UART_CTL_STOPBITS_m BIT(10) 156 157 #define RP2_BAUD 0x01c 158 159 /* ucode registers */ 160 #define RP2_TX_SWFLOW 0x02 161 #define RP2_TX_SWFLOW_ena 0x81 162 #define RP2_TX_SWFLOW_dis 0x9d 163 164 #define RP2_RX_SWFLOW 0x0c 165 #define RP2_RX_SWFLOW_ena 0x81 166 #define RP2_RX_SWFLOW_dis 0x8d 167 168 #define RP2_RX_FIFO 0x37 169 #define RP2_RX_FIFO_ena 0x08 170 #define RP2_RX_FIFO_dis 0x81 171 172 static struct uart_driver rp2_uart_driver = { 173 .owner = THIS_MODULE, 174 .driver_name = DRV_NAME, 175 .dev_name = "ttyRP", 176 .nr = CONFIG_SERIAL_RP2_NR_UARTS, 177 }; 178 179 struct rp2_card; 180 181 struct rp2_uart_port { 182 struct uart_port port; 183 int idx; 184 int ignore_rx; 185 struct rp2_card *card; 186 void __iomem *asic_base; 187 void __iomem *base; 188 void __iomem *ucode; 189 }; 190 191 struct rp2_card { 192 struct pci_dev *pdev; 193 struct rp2_uart_port *ports; 194 int n_ports; 195 int initialized_ports; 196 int minor_start; 197 int smpte; 198 void __iomem *bar0; 199 void __iomem *bar1; 200 spinlock_t card_lock; 201 struct completion fw_loaded; 202 }; 203 204 #define RP_ID(prod) PCI_VDEVICE(RP, (prod)) 205 #define RP_CAP(ports, smpte) (((ports) << 8) | ((smpte) << 0)) 206 207 static inline void rp2_decode_cap(const struct pci_device_id *id, 208 int *ports, int *smpte) 209 { 210 *ports = id->driver_data >> 8; 211 *smpte = id->driver_data & 0xff; 212 } 213 214 static DEFINE_SPINLOCK(rp2_minor_lock); 215 static int rp2_minor_next; 216 217 static int rp2_alloc_ports(int n_ports) 218 { 219 int ret = -ENOSPC; 220 221 spin_lock(&rp2_minor_lock); 222 if (rp2_minor_next + n_ports <= CONFIG_SERIAL_RP2_NR_UARTS) { 223 /* sorry, no support for hot unplugging individual cards */ 224 ret = rp2_minor_next; 225 rp2_minor_next += n_ports; 226 } 227 spin_unlock(&rp2_minor_lock); 228 229 return ret; 230 } 231 232 static inline struct rp2_uart_port *port_to_up(struct uart_port *port) 233 { 234 return container_of(port, struct rp2_uart_port, port); 235 } 236 237 static void rp2_rmw(struct rp2_uart_port *up, int reg, 238 u32 clr_bits, u32 set_bits) 239 { 240 u32 tmp = readl(up->base + reg); 241 tmp &= ~clr_bits; 242 tmp |= set_bits; 243 writel(tmp, up->base + reg); 244 } 245 246 static void rp2_rmw_clr(struct rp2_uart_port *up, int reg, u32 val) 247 { 248 rp2_rmw(up, reg, val, 0); 249 } 250 251 static void rp2_rmw_set(struct rp2_uart_port *up, int reg, u32 val) 252 { 253 rp2_rmw(up, reg, 0, val); 254 } 255 256 static void rp2_mask_ch_irq(struct rp2_uart_port *up, int ch_num, 257 int is_enabled) 258 { 259 unsigned long flags, irq_mask; 260 261 spin_lock_irqsave(&up->card->card_lock, flags); 262 263 irq_mask = readl(up->asic_base + RP2_CH_IRQ_MASK); 264 if (is_enabled) 265 irq_mask &= ~BIT(ch_num); 266 else 267 irq_mask |= BIT(ch_num); 268 writel(irq_mask, up->asic_base + RP2_CH_IRQ_MASK); 269 270 spin_unlock_irqrestore(&up->card->card_lock, flags); 271 } 272 273 static unsigned int rp2_uart_tx_empty(struct uart_port *port) 274 { 275 struct rp2_uart_port *up = port_to_up(port); 276 unsigned long tx_fifo_bytes, flags; 277 278 /* 279 * This should probably check the transmitter, not the FIFO. 280 * But the TXEMPTY bit doesn't seem to work unless the TX IRQ is 281 * enabled. 282 */ 283 spin_lock_irqsave(&up->port.lock, flags); 284 tx_fifo_bytes = readw(up->base + RP2_TX_FIFO_COUNT); 285 spin_unlock_irqrestore(&up->port.lock, flags); 286 287 return tx_fifo_bytes ? 0 : TIOCSER_TEMT; 288 } 289 290 static unsigned int rp2_uart_get_mctrl(struct uart_port *port) 291 { 292 struct rp2_uart_port *up = port_to_up(port); 293 u32 status; 294 295 status = readl(up->base + RP2_CHAN_STAT); 296 return ((status & RP2_CHAN_STAT_DCD_m) ? TIOCM_CAR : 0) | 297 ((status & RP2_CHAN_STAT_DSR_m) ? TIOCM_DSR : 0) | 298 ((status & RP2_CHAN_STAT_CTS_m) ? TIOCM_CTS : 0) | 299 ((status & RP2_CHAN_STAT_RI_m) ? TIOCM_RI : 0); 300 } 301 302 static void rp2_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) 303 { 304 rp2_rmw(port_to_up(port), RP2_TXRX_CTL, 305 RP2_TXRX_CTL_DTR_m | RP2_TXRX_CTL_RTS_m | RP2_TXRX_CTL_LOOP_m, 306 ((mctrl & TIOCM_DTR) ? RP2_TXRX_CTL_DTR_m : 0) | 307 ((mctrl & TIOCM_RTS) ? RP2_TXRX_CTL_RTS_m : 0) | 308 ((mctrl & TIOCM_LOOP) ? RP2_TXRX_CTL_LOOP_m : 0)); 309 } 310 311 static void rp2_uart_start_tx(struct uart_port *port) 312 { 313 rp2_rmw_set(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_TXIRQ_m); 314 } 315 316 static void rp2_uart_stop_tx(struct uart_port *port) 317 { 318 rp2_rmw_clr(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_TXIRQ_m); 319 } 320 321 static void rp2_uart_stop_rx(struct uart_port *port) 322 { 323 rp2_rmw_clr(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_RXIRQ_m); 324 } 325 326 static void rp2_uart_break_ctl(struct uart_port *port, int break_state) 327 { 328 unsigned long flags; 329 330 spin_lock_irqsave(&port->lock, flags); 331 rp2_rmw(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_BREAK_m, 332 break_state ? RP2_TXRX_CTL_BREAK_m : 0); 333 spin_unlock_irqrestore(&port->lock, flags); 334 } 335 336 static void rp2_uart_enable_ms(struct uart_port *port) 337 { 338 rp2_rmw_set(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_MSRIRQ_m); 339 } 340 341 static void __rp2_uart_set_termios(struct rp2_uart_port *up, 342 unsigned long cfl, 343 unsigned long ifl, 344 unsigned int baud_div) 345 { 346 /* baud rate divisor (calculated elsewhere). 0 = divide-by-1 */ 347 writew(baud_div - 1, up->base + RP2_BAUD); 348 349 /* data bits and stop bits */ 350 rp2_rmw(up, RP2_UART_CTL, 351 RP2_UART_CTL_STOPBITS_m | RP2_UART_CTL_DATABITS_m, 352 ((cfl & CSTOPB) ? RP2_UART_CTL_STOPBITS_m : 0) | 353 (((cfl & CSIZE) == CS8) ? RP2_UART_CTL_DATABITS_8 : 0) | 354 (((cfl & CSIZE) == CS7) ? RP2_UART_CTL_DATABITS_7 : 0) | 355 (((cfl & CSIZE) == CS6) ? RP2_UART_CTL_DATABITS_6 : 0) | 356 (((cfl & CSIZE) == CS5) ? RP2_UART_CTL_DATABITS_5 : 0)); 357 358 /* parity and hardware flow control */ 359 rp2_rmw(up, RP2_TXRX_CTL, 360 RP2_TXRX_CTL_PARENB_m | RP2_TXRX_CTL_nPARODD_m | 361 RP2_TXRX_CTL_CMSPAR_m | RP2_TXRX_CTL_DTRFLOW_m | 362 RP2_TXRX_CTL_DSRFLOW_m | RP2_TXRX_CTL_RTSFLOW_m | 363 RP2_TXRX_CTL_CTSFLOW_m, 364 ((cfl & PARENB) ? RP2_TXRX_CTL_PARENB_m : 0) | 365 ((cfl & PARODD) ? 0 : RP2_TXRX_CTL_nPARODD_m) | 366 ((cfl & CMSPAR) ? RP2_TXRX_CTL_CMSPAR_m : 0) | 367 ((cfl & CRTSCTS) ? (RP2_TXRX_CTL_RTSFLOW_m | 368 RP2_TXRX_CTL_CTSFLOW_m) : 0)); 369 370 /* XON/XOFF software flow control */ 371 writeb((ifl & IXON) ? RP2_TX_SWFLOW_ena : RP2_TX_SWFLOW_dis, 372 up->ucode + RP2_TX_SWFLOW); 373 writeb((ifl & IXOFF) ? RP2_RX_SWFLOW_ena : RP2_RX_SWFLOW_dis, 374 up->ucode + RP2_RX_SWFLOW); 375 } 376 377 static void rp2_uart_set_termios(struct uart_port *port, 378 struct ktermios *new, 379 struct ktermios *old) 380 { 381 struct rp2_uart_port *up = port_to_up(port); 382 unsigned long flags; 383 unsigned int baud, baud_div; 384 385 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16); 386 baud_div = uart_get_divisor(port, baud); 387 388 if (tty_termios_baud_rate(new)) 389 tty_termios_encode_baud_rate(new, baud, baud); 390 391 spin_lock_irqsave(&port->lock, flags); 392 393 /* ignore all characters if CREAD is not set */ 394 port->ignore_status_mask = (new->c_cflag & CREAD) ? 0 : RP2_DUMMY_READ; 395 396 __rp2_uart_set_termios(up, new->c_cflag, new->c_iflag, baud_div); 397 uart_update_timeout(port, new->c_cflag, baud); 398 399 spin_unlock_irqrestore(&port->lock, flags); 400 } 401 402 static void rp2_rx_chars(struct rp2_uart_port *up) 403 { 404 u16 bytes = readw(up->base + RP2_RX_FIFO_COUNT); 405 struct tty_port *port = &up->port.state->port; 406 407 for (; bytes != 0; bytes--) { 408 u32 byte = readw(up->base + RP2_DATA_BYTE) | RP2_DUMMY_READ; 409 char ch = byte & 0xff; 410 411 if (likely(!(byte & RP2_DATA_BYTE_EXCEPTION_MASK))) { 412 if (!uart_handle_sysrq_char(&up->port, ch)) 413 uart_insert_char(&up->port, byte, 0, ch, 414 TTY_NORMAL); 415 } else { 416 char flag = TTY_NORMAL; 417 418 if (byte & RP2_DATA_BYTE_BREAK_m) 419 flag = TTY_BREAK; 420 else if (byte & RP2_DATA_BYTE_ERR_FRAMING_m) 421 flag = TTY_FRAME; 422 else if (byte & RP2_DATA_BYTE_ERR_PARITY_m) 423 flag = TTY_PARITY; 424 uart_insert_char(&up->port, byte, 425 RP2_DATA_BYTE_ERR_OVERRUN_m, ch, flag); 426 } 427 up->port.icount.rx++; 428 } 429 430 spin_unlock(&up->port.lock); 431 tty_flip_buffer_push(port); 432 spin_lock(&up->port.lock); 433 } 434 435 static void rp2_tx_chars(struct rp2_uart_port *up) 436 { 437 u16 max_tx = FIFO_SIZE - readw(up->base + RP2_TX_FIFO_COUNT); 438 struct circ_buf *xmit = &up->port.state->xmit; 439 440 if (uart_tx_stopped(&up->port)) { 441 rp2_uart_stop_tx(&up->port); 442 return; 443 } 444 445 for (; max_tx != 0; max_tx--) { 446 if (up->port.x_char) { 447 writeb(up->port.x_char, up->base + RP2_DATA_BYTE); 448 up->port.x_char = 0; 449 up->port.icount.tx++; 450 continue; 451 } 452 if (uart_circ_empty(xmit)) { 453 rp2_uart_stop_tx(&up->port); 454 break; 455 } 456 writeb(xmit->buf[xmit->tail], up->base + RP2_DATA_BYTE); 457 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 458 up->port.icount.tx++; 459 } 460 461 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 462 uart_write_wakeup(&up->port); 463 } 464 465 static void rp2_ch_interrupt(struct rp2_uart_port *up) 466 { 467 u32 status; 468 469 spin_lock(&up->port.lock); 470 471 /* 472 * The IRQ status bits are clear-on-write. Other status bits in 473 * this register aren't, so it's harmless to write to them. 474 */ 475 status = readl(up->base + RP2_CHAN_STAT); 476 writel(status, up->base + RP2_CHAN_STAT); 477 478 if (status & RP2_CHAN_STAT_RXDATA_m) 479 rp2_rx_chars(up); 480 if (status & RP2_CHAN_STAT_TXEMPTY_m) 481 rp2_tx_chars(up); 482 if (status & RP2_CHAN_STAT_MS_CHANGED_MASK) 483 wake_up_interruptible(&up->port.state->port.delta_msr_wait); 484 485 spin_unlock(&up->port.lock); 486 } 487 488 static int rp2_asic_interrupt(struct rp2_card *card, unsigned int asic_id) 489 { 490 void __iomem *base = card->bar1 + RP2_ASIC_OFFSET(asic_id); 491 int ch, handled = 0; 492 unsigned long status = readl(base + RP2_CH_IRQ_STAT) & 493 ~readl(base + RP2_CH_IRQ_MASK); 494 495 for_each_set_bit(ch, &status, PORTS_PER_ASIC) { 496 rp2_ch_interrupt(&card->ports[ch]); 497 handled++; 498 } 499 return handled; 500 } 501 502 static irqreturn_t rp2_uart_interrupt(int irq, void *dev_id) 503 { 504 struct rp2_card *card = dev_id; 505 int handled; 506 507 handled = rp2_asic_interrupt(card, 0); 508 if (card->n_ports >= PORTS_PER_ASIC) 509 handled += rp2_asic_interrupt(card, 1); 510 511 return handled ? IRQ_HANDLED : IRQ_NONE; 512 } 513 514 static inline void rp2_flush_fifos(struct rp2_uart_port *up) 515 { 516 rp2_rmw_set(up, RP2_UART_CTL, 517 RP2_UART_CTL_FLUSH_RX_m | RP2_UART_CTL_FLUSH_TX_m); 518 readl(up->base + RP2_UART_CTL); 519 udelay(10); 520 rp2_rmw_clr(up, RP2_UART_CTL, 521 RP2_UART_CTL_FLUSH_RX_m | RP2_UART_CTL_FLUSH_TX_m); 522 } 523 524 static int rp2_uart_startup(struct uart_port *port) 525 { 526 struct rp2_uart_port *up = port_to_up(port); 527 528 rp2_flush_fifos(up); 529 rp2_rmw(up, RP2_TXRX_CTL, RP2_TXRX_CTL_MSRIRQ_m, RP2_TXRX_CTL_RXIRQ_m); 530 rp2_rmw(up, RP2_TXRX_CTL, RP2_TXRX_CTL_RX_TRIG_m, 531 RP2_TXRX_CTL_RX_TRIG_1); 532 rp2_rmw(up, RP2_CHAN_STAT, 0, 0); 533 rp2_mask_ch_irq(up, up->idx, 1); 534 535 return 0; 536 } 537 538 static void rp2_uart_shutdown(struct uart_port *port) 539 { 540 struct rp2_uart_port *up = port_to_up(port); 541 unsigned long flags; 542 543 rp2_uart_break_ctl(port, 0); 544 545 spin_lock_irqsave(&port->lock, flags); 546 rp2_mask_ch_irq(up, up->idx, 0); 547 rp2_rmw(up, RP2_CHAN_STAT, 0, 0); 548 spin_unlock_irqrestore(&port->lock, flags); 549 } 550 551 static const char *rp2_uart_type(struct uart_port *port) 552 { 553 return (port->type == PORT_RP2) ? "RocketPort 2 UART" : NULL; 554 } 555 556 static void rp2_uart_release_port(struct uart_port *port) 557 { 558 /* Nothing to release ... */ 559 } 560 561 static int rp2_uart_request_port(struct uart_port *port) 562 { 563 /* UARTs always present */ 564 return 0; 565 } 566 567 static void rp2_uart_config_port(struct uart_port *port, int flags) 568 { 569 if (flags & UART_CONFIG_TYPE) 570 port->type = PORT_RP2; 571 } 572 573 static int rp2_uart_verify_port(struct uart_port *port, 574 struct serial_struct *ser) 575 { 576 if (ser->type != PORT_UNKNOWN && ser->type != PORT_RP2) 577 return -EINVAL; 578 579 return 0; 580 } 581 582 static const struct uart_ops rp2_uart_ops = { 583 .tx_empty = rp2_uart_tx_empty, 584 .set_mctrl = rp2_uart_set_mctrl, 585 .get_mctrl = rp2_uart_get_mctrl, 586 .stop_tx = rp2_uart_stop_tx, 587 .start_tx = rp2_uart_start_tx, 588 .stop_rx = rp2_uart_stop_rx, 589 .enable_ms = rp2_uart_enable_ms, 590 .break_ctl = rp2_uart_break_ctl, 591 .startup = rp2_uart_startup, 592 .shutdown = rp2_uart_shutdown, 593 .set_termios = rp2_uart_set_termios, 594 .type = rp2_uart_type, 595 .release_port = rp2_uart_release_port, 596 .request_port = rp2_uart_request_port, 597 .config_port = rp2_uart_config_port, 598 .verify_port = rp2_uart_verify_port, 599 }; 600 601 static void rp2_reset_asic(struct rp2_card *card, unsigned int asic_id) 602 { 603 void __iomem *base = card->bar1 + RP2_ASIC_OFFSET(asic_id); 604 u32 clk_cfg; 605 606 writew(1, base + RP2_GLOBAL_CMD); 607 readw(base + RP2_GLOBAL_CMD); 608 msleep(100); 609 writel(0, base + RP2_CLK_PRESCALER); 610 611 /* TDM clock configuration */ 612 clk_cfg = readw(base + RP2_ASIC_CFG); 613 clk_cfg = (clk_cfg & ~BIT(8)) | BIT(9); 614 writew(clk_cfg, base + RP2_ASIC_CFG); 615 616 /* IRQ routing */ 617 writel(ALL_PORTS_MASK, base + RP2_CH_IRQ_MASK); 618 writel(RP2_ASIC_IRQ_EN_m, base + RP2_ASIC_IRQ); 619 } 620 621 static void rp2_init_card(struct rp2_card *card) 622 { 623 writel(4, card->bar0 + RP2_FPGA_CTL0); 624 writel(0, card->bar0 + RP2_FPGA_CTL1); 625 626 rp2_reset_asic(card, 0); 627 if (card->n_ports >= PORTS_PER_ASIC) 628 rp2_reset_asic(card, 1); 629 630 writel(RP2_IRQ_MASK_EN_m, card->bar0 + RP2_IRQ_MASK); 631 } 632 633 static void rp2_init_port(struct rp2_uart_port *up, const struct firmware *fw) 634 { 635 int i; 636 637 writel(RP2_UART_CTL_RESET_CH_m, up->base + RP2_UART_CTL); 638 readl(up->base + RP2_UART_CTL); 639 udelay(1); 640 641 writel(0, up->base + RP2_TXRX_CTL); 642 writel(0, up->base + RP2_UART_CTL); 643 readl(up->base + RP2_UART_CTL); 644 udelay(1); 645 646 rp2_flush_fifos(up); 647 648 for (i = 0; i < min_t(int, fw->size, RP2_UCODE_BYTES); i++) 649 writeb(fw->data[i], up->ucode + i); 650 651 __rp2_uart_set_termios(up, CS8 | CREAD | CLOCAL, 0, DEFAULT_BAUD_DIV); 652 rp2_uart_set_mctrl(&up->port, 0); 653 654 writeb(RP2_RX_FIFO_ena, up->ucode + RP2_RX_FIFO); 655 rp2_rmw(up, RP2_UART_CTL, RP2_UART_CTL_MODE_m, 656 RP2_UART_CTL_XMIT_EN_m | RP2_UART_CTL_MODE_rs232); 657 rp2_rmw_set(up, RP2_TXRX_CTL, 658 RP2_TXRX_CTL_TX_EN_m | RP2_TXRX_CTL_RX_EN_m); 659 } 660 661 static void rp2_remove_ports(struct rp2_card *card) 662 { 663 int i; 664 665 for (i = 0; i < card->initialized_ports; i++) 666 uart_remove_one_port(&rp2_uart_driver, &card->ports[i].port); 667 card->initialized_ports = 0; 668 } 669 670 static void rp2_fw_cb(const struct firmware *fw, void *context) 671 { 672 struct rp2_card *card = context; 673 resource_size_t phys_base; 674 int i, rc = -ENOENT; 675 676 if (!fw) { 677 dev_err(&card->pdev->dev, "cannot find '%s' firmware image\n", 678 RP2_FW_NAME); 679 goto no_fw; 680 } 681 682 phys_base = pci_resource_start(card->pdev, 1); 683 684 for (i = 0; i < card->n_ports; i++) { 685 struct rp2_uart_port *rp = &card->ports[i]; 686 struct uart_port *p; 687 int j = (unsigned)i % PORTS_PER_ASIC; 688 689 rp->asic_base = card->bar1; 690 rp->base = card->bar1 + RP2_PORT_BASE + j*RP2_PORT_SPACING; 691 rp->ucode = card->bar1 + RP2_UCODE_BASE + j*RP2_UCODE_SPACING; 692 rp->card = card; 693 rp->idx = j; 694 695 p = &rp->port; 696 p->line = card->minor_start + i; 697 p->dev = &card->pdev->dev; 698 p->type = PORT_RP2; 699 p->iotype = UPIO_MEM32; 700 p->uartclk = UART_CLOCK; 701 p->regshift = 2; 702 p->fifosize = FIFO_SIZE; 703 p->ops = &rp2_uart_ops; 704 p->irq = card->pdev->irq; 705 p->membase = rp->base; 706 p->mapbase = phys_base + RP2_PORT_BASE + j*RP2_PORT_SPACING; 707 708 if (i >= PORTS_PER_ASIC) { 709 rp->asic_base += RP2_ASIC_SPACING; 710 rp->base += RP2_ASIC_SPACING; 711 rp->ucode += RP2_ASIC_SPACING; 712 p->mapbase += RP2_ASIC_SPACING; 713 } 714 715 rp2_init_port(rp, fw); 716 rc = uart_add_one_port(&rp2_uart_driver, p); 717 if (rc) { 718 dev_err(&card->pdev->dev, 719 "error registering port %d: %d\n", i, rc); 720 rp2_remove_ports(card); 721 break; 722 } 723 card->initialized_ports++; 724 } 725 726 release_firmware(fw); 727 no_fw: 728 /* 729 * rp2_fw_cb() is called from a workqueue long after rp2_probe() 730 * has already returned success. So if something failed here, 731 * we'll just leave the now-dormant device in place until somebody 732 * unbinds it. 733 */ 734 if (rc) 735 dev_warn(&card->pdev->dev, "driver initialization failed\n"); 736 737 complete(&card->fw_loaded); 738 } 739 740 static int rp2_probe(struct pci_dev *pdev, 741 const struct pci_device_id *id) 742 { 743 struct rp2_card *card; 744 struct rp2_uart_port *ports; 745 void __iomem * const *bars; 746 int rc; 747 748 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL); 749 if (!card) 750 return -ENOMEM; 751 pci_set_drvdata(pdev, card); 752 spin_lock_init(&card->card_lock); 753 init_completion(&card->fw_loaded); 754 755 rc = pcim_enable_device(pdev); 756 if (rc) 757 return rc; 758 759 rc = pcim_iomap_regions_request_all(pdev, 0x03, DRV_NAME); 760 if (rc) 761 return rc; 762 763 bars = pcim_iomap_table(pdev); 764 card->bar0 = bars[0]; 765 card->bar1 = bars[1]; 766 card->pdev = pdev; 767 768 rp2_decode_cap(id, &card->n_ports, &card->smpte); 769 dev_info(&pdev->dev, "found new card with %d ports\n", card->n_ports); 770 771 card->minor_start = rp2_alloc_ports(card->n_ports); 772 if (card->minor_start < 0) { 773 dev_err(&pdev->dev, 774 "too many ports (try increasing CONFIG_SERIAL_RP2_NR_UARTS)\n"); 775 return -EINVAL; 776 } 777 778 rp2_init_card(card); 779 780 ports = devm_kzalloc(&pdev->dev, sizeof(*ports) * card->n_ports, 781 GFP_KERNEL); 782 if (!ports) 783 return -ENOMEM; 784 card->ports = ports; 785 786 rc = devm_request_irq(&pdev->dev, pdev->irq, rp2_uart_interrupt, 787 IRQF_SHARED, DRV_NAME, card); 788 if (rc) 789 return rc; 790 791 /* 792 * Only catastrophic errors (e.g. ENOMEM) are reported here. 793 * If the FW image is missing, we'll find out in rp2_fw_cb() 794 * and print an error message. 795 */ 796 rc = request_firmware_nowait(THIS_MODULE, 1, RP2_FW_NAME, &pdev->dev, 797 GFP_KERNEL, card, rp2_fw_cb); 798 if (rc) 799 return rc; 800 dev_dbg(&pdev->dev, "waiting for firmware blob...\n"); 801 802 return 0; 803 } 804 805 static void rp2_remove(struct pci_dev *pdev) 806 { 807 struct rp2_card *card = pci_get_drvdata(pdev); 808 809 wait_for_completion(&card->fw_loaded); 810 rp2_remove_ports(card); 811 } 812 813 static DEFINE_PCI_DEVICE_TABLE(rp2_pci_tbl) = { 814 815 /* RocketPort INFINITY cards */ 816 817 { RP_ID(0x0040), RP_CAP(8, 0) }, /* INF Octa, RJ45, selectable */ 818 { RP_ID(0x0041), RP_CAP(32, 0) }, /* INF 32, ext interface */ 819 { RP_ID(0x0042), RP_CAP(8, 0) }, /* INF Octa, ext interface */ 820 { RP_ID(0x0043), RP_CAP(16, 0) }, /* INF 16, ext interface */ 821 { RP_ID(0x0044), RP_CAP(4, 0) }, /* INF Quad, DB, selectable */ 822 { RP_ID(0x0045), RP_CAP(8, 0) }, /* INF Octa, DB, selectable */ 823 { RP_ID(0x0046), RP_CAP(4, 0) }, /* INF Quad, ext interface */ 824 { RP_ID(0x0047), RP_CAP(4, 0) }, /* INF Quad, RJ45 */ 825 { RP_ID(0x004a), RP_CAP(4, 0) }, /* INF Plus, Quad */ 826 { RP_ID(0x004b), RP_CAP(8, 0) }, /* INF Plus, Octa */ 827 { RP_ID(0x004c), RP_CAP(8, 0) }, /* INF III, Octa */ 828 { RP_ID(0x004d), RP_CAP(4, 0) }, /* INF III, Quad */ 829 { RP_ID(0x004e), RP_CAP(2, 0) }, /* INF Plus, 2, RS232 */ 830 { RP_ID(0x004f), RP_CAP(2, 1) }, /* INF Plus, 2, SMPTE */ 831 { RP_ID(0x0050), RP_CAP(4, 0) }, /* INF Plus, Quad, RJ45 */ 832 { RP_ID(0x0051), RP_CAP(8, 0) }, /* INF Plus, Octa, RJ45 */ 833 { RP_ID(0x0052), RP_CAP(8, 1) }, /* INF Octa, SMPTE */ 834 835 /* RocketPort EXPRESS cards */ 836 837 { RP_ID(0x0060), RP_CAP(8, 0) }, /* EXP Octa, RJ45, selectable */ 838 { RP_ID(0x0061), RP_CAP(32, 0) }, /* EXP 32, ext interface */ 839 { RP_ID(0x0062), RP_CAP(8, 0) }, /* EXP Octa, ext interface */ 840 { RP_ID(0x0063), RP_CAP(16, 0) }, /* EXP 16, ext interface */ 841 { RP_ID(0x0064), RP_CAP(4, 0) }, /* EXP Quad, DB, selectable */ 842 { RP_ID(0x0065), RP_CAP(8, 0) }, /* EXP Octa, DB, selectable */ 843 { RP_ID(0x0066), RP_CAP(4, 0) }, /* EXP Quad, ext interface */ 844 { RP_ID(0x0067), RP_CAP(4, 0) }, /* EXP Quad, RJ45 */ 845 { RP_ID(0x0068), RP_CAP(8, 0) }, /* EXP Octa, RJ11 */ 846 { RP_ID(0x0072), RP_CAP(8, 1) }, /* EXP Octa, SMPTE */ 847 { } 848 }; 849 MODULE_DEVICE_TABLE(pci, rp2_pci_tbl); 850 851 static struct pci_driver rp2_pci_driver = { 852 .name = DRV_NAME, 853 .id_table = rp2_pci_tbl, 854 .probe = rp2_probe, 855 .remove = rp2_remove, 856 }; 857 858 static int __init rp2_uart_init(void) 859 { 860 int rc; 861 862 rc = uart_register_driver(&rp2_uart_driver); 863 if (rc) 864 return rc; 865 866 rc = pci_register_driver(&rp2_pci_driver); 867 if (rc) { 868 uart_unregister_driver(&rp2_uart_driver); 869 return rc; 870 } 871 872 return 0; 873 } 874 875 static void __exit rp2_uart_exit(void) 876 { 877 pci_unregister_driver(&rp2_pci_driver); 878 uart_unregister_driver(&rp2_uart_driver); 879 } 880 881 module_init(rp2_uart_init); 882 module_exit(rp2_uart_exit); 883 884 MODULE_DESCRIPTION("Comtrol RocketPort EXPRESS/INFINITY driver"); 885 MODULE_AUTHOR("Kevin Cernekee <cernekee@gmail.com>"); 886 MODULE_LICENSE("GPL v2"); 887 MODULE_FIRMWARE(RP2_FW_NAME); 888