1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Driver for Comtrol RocketPort EXPRESS/INFINITY cards 4 * 5 * Copyright (C) 2012 Kevin Cernekee <cernekee@gmail.com> 6 * 7 * Inspired by, and loosely based on: 8 * 9 * ar933x_uart.c 10 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org> 11 * 12 * rocketport_infinity_express-linux-1.20.tar.gz 13 * Copyright (C) 2004-2011 Comtrol, Inc. 14 */ 15 16 #include <linux/bitops.h> 17 #include <linux/compiler.h> 18 #include <linux/completion.h> 19 #include <linux/console.h> 20 #include <linux/delay.h> 21 #include <linux/firmware.h> 22 #include <linux/init.h> 23 #include <linux/io.h> 24 #include <linux/ioport.h> 25 #include <linux/irq.h> 26 #include <linux/kernel.h> 27 #include <linux/log2.h> 28 #include <linux/module.h> 29 #include <linux/pci.h> 30 #include <linux/serial.h> 31 #include <linux/serial_core.h> 32 #include <linux/slab.h> 33 #include <linux/sysrq.h> 34 #include <linux/tty.h> 35 #include <linux/tty_flip.h> 36 #include <linux/types.h> 37 38 #define DRV_NAME "rp2" 39 40 #define RP2_FW_NAME "rp2.fw" 41 #define RP2_UCODE_BYTES 0x3f 42 43 #define PORTS_PER_ASIC 16 44 #define ALL_PORTS_MASK (BIT(PORTS_PER_ASIC) - 1) 45 46 #define UART_CLOCK 44236800 47 #define DEFAULT_BAUD_DIV (UART_CLOCK / (9600 * 16)) 48 #define FIFO_SIZE 512 49 50 /* BAR0 registers */ 51 #define RP2_FPGA_CTL0 0x110 52 #define RP2_FPGA_CTL1 0x11c 53 #define RP2_IRQ_MASK 0x1ec 54 #define RP2_IRQ_MASK_EN_m BIT(0) 55 #define RP2_IRQ_STATUS 0x1f0 56 57 /* BAR1 registers */ 58 #define RP2_ASIC_SPACING 0x1000 59 #define RP2_ASIC_OFFSET(i) ((i) << ilog2(RP2_ASIC_SPACING)) 60 61 #define RP2_PORT_BASE 0x000 62 #define RP2_PORT_SPACING 0x040 63 64 #define RP2_UCODE_BASE 0x400 65 #define RP2_UCODE_SPACING 0x80 66 67 #define RP2_CLK_PRESCALER 0xc00 68 #define RP2_CH_IRQ_STAT 0xc04 69 #define RP2_CH_IRQ_MASK 0xc08 70 #define RP2_ASIC_IRQ 0xd00 71 #define RP2_ASIC_IRQ_EN_m BIT(20) 72 #define RP2_GLOBAL_CMD 0xd0c 73 #define RP2_ASIC_CFG 0xd04 74 75 /* port registers */ 76 #define RP2_DATA_DWORD 0x000 77 78 #define RP2_DATA_BYTE 0x008 79 #define RP2_DATA_BYTE_ERR_PARITY_m BIT(8) 80 #define RP2_DATA_BYTE_ERR_OVERRUN_m BIT(9) 81 #define RP2_DATA_BYTE_ERR_FRAMING_m BIT(10) 82 #define RP2_DATA_BYTE_BREAK_m BIT(11) 83 84 /* This lets uart_insert_char() drop bytes received on a !CREAD port */ 85 #define RP2_DUMMY_READ BIT(16) 86 87 #define RP2_DATA_BYTE_EXCEPTION_MASK (RP2_DATA_BYTE_ERR_PARITY_m | \ 88 RP2_DATA_BYTE_ERR_OVERRUN_m | \ 89 RP2_DATA_BYTE_ERR_FRAMING_m | \ 90 RP2_DATA_BYTE_BREAK_m) 91 92 #define RP2_RX_FIFO_COUNT 0x00c 93 #define RP2_TX_FIFO_COUNT 0x00e 94 95 #define RP2_CHAN_STAT 0x010 96 #define RP2_CHAN_STAT_RXDATA_m BIT(0) 97 #define RP2_CHAN_STAT_DCD_m BIT(3) 98 #define RP2_CHAN_STAT_DSR_m BIT(4) 99 #define RP2_CHAN_STAT_CTS_m BIT(5) 100 #define RP2_CHAN_STAT_RI_m BIT(6) 101 #define RP2_CHAN_STAT_OVERRUN_m BIT(13) 102 #define RP2_CHAN_STAT_DSR_CHANGED_m BIT(16) 103 #define RP2_CHAN_STAT_CTS_CHANGED_m BIT(17) 104 #define RP2_CHAN_STAT_CD_CHANGED_m BIT(18) 105 #define RP2_CHAN_STAT_RI_CHANGED_m BIT(22) 106 #define RP2_CHAN_STAT_TXEMPTY_m BIT(25) 107 108 #define RP2_CHAN_STAT_MS_CHANGED_MASK (RP2_CHAN_STAT_DSR_CHANGED_m | \ 109 RP2_CHAN_STAT_CTS_CHANGED_m | \ 110 RP2_CHAN_STAT_CD_CHANGED_m | \ 111 RP2_CHAN_STAT_RI_CHANGED_m) 112 113 #define RP2_TXRX_CTL 0x014 114 #define RP2_TXRX_CTL_MSRIRQ_m BIT(0) 115 #define RP2_TXRX_CTL_RXIRQ_m BIT(2) 116 #define RP2_TXRX_CTL_RX_TRIG_s 3 117 #define RP2_TXRX_CTL_RX_TRIG_m (0x3 << RP2_TXRX_CTL_RX_TRIG_s) 118 #define RP2_TXRX_CTL_RX_TRIG_1 (0x1 << RP2_TXRX_CTL_RX_TRIG_s) 119 #define RP2_TXRX_CTL_RX_TRIG_256 (0x2 << RP2_TXRX_CTL_RX_TRIG_s) 120 #define RP2_TXRX_CTL_RX_TRIG_448 (0x3 << RP2_TXRX_CTL_RX_TRIG_s) 121 #define RP2_TXRX_CTL_RX_EN_m BIT(5) 122 #define RP2_TXRX_CTL_RTSFLOW_m BIT(6) 123 #define RP2_TXRX_CTL_DTRFLOW_m BIT(7) 124 #define RP2_TXRX_CTL_TX_TRIG_s 16 125 #define RP2_TXRX_CTL_TX_TRIG_m (0x3 << RP2_TXRX_CTL_RX_TRIG_s) 126 #define RP2_TXRX_CTL_DSRFLOW_m BIT(18) 127 #define RP2_TXRX_CTL_TXIRQ_m BIT(19) 128 #define RP2_TXRX_CTL_CTSFLOW_m BIT(23) 129 #define RP2_TXRX_CTL_TX_EN_m BIT(24) 130 #define RP2_TXRX_CTL_RTS_m BIT(25) 131 #define RP2_TXRX_CTL_DTR_m BIT(26) 132 #define RP2_TXRX_CTL_LOOP_m BIT(27) 133 #define RP2_TXRX_CTL_BREAK_m BIT(28) 134 #define RP2_TXRX_CTL_CMSPAR_m BIT(29) 135 #define RP2_TXRX_CTL_nPARODD_m BIT(30) 136 #define RP2_TXRX_CTL_PARENB_m BIT(31) 137 138 #define RP2_UART_CTL 0x018 139 #define RP2_UART_CTL_MODE_s 0 140 #define RP2_UART_CTL_MODE_m (0x7 << RP2_UART_CTL_MODE_s) 141 #define RP2_UART_CTL_MODE_rs232 (0x1 << RP2_UART_CTL_MODE_s) 142 #define RP2_UART_CTL_FLUSH_RX_m BIT(3) 143 #define RP2_UART_CTL_FLUSH_TX_m BIT(4) 144 #define RP2_UART_CTL_RESET_CH_m BIT(5) 145 #define RP2_UART_CTL_XMIT_EN_m BIT(6) 146 #define RP2_UART_CTL_DATABITS_s 8 147 #define RP2_UART_CTL_DATABITS_m (0x3 << RP2_UART_CTL_DATABITS_s) 148 #define RP2_UART_CTL_DATABITS_8 (0x3 << RP2_UART_CTL_DATABITS_s) 149 #define RP2_UART_CTL_DATABITS_7 (0x2 << RP2_UART_CTL_DATABITS_s) 150 #define RP2_UART_CTL_DATABITS_6 (0x1 << RP2_UART_CTL_DATABITS_s) 151 #define RP2_UART_CTL_DATABITS_5 (0x0 << RP2_UART_CTL_DATABITS_s) 152 #define RP2_UART_CTL_STOPBITS_m BIT(10) 153 154 #define RP2_BAUD 0x01c 155 156 /* ucode registers */ 157 #define RP2_TX_SWFLOW 0x02 158 #define RP2_TX_SWFLOW_ena 0x81 159 #define RP2_TX_SWFLOW_dis 0x9d 160 161 #define RP2_RX_SWFLOW 0x0c 162 #define RP2_RX_SWFLOW_ena 0x81 163 #define RP2_RX_SWFLOW_dis 0x8d 164 165 #define RP2_RX_FIFO 0x37 166 #define RP2_RX_FIFO_ena 0x08 167 #define RP2_RX_FIFO_dis 0x81 168 169 static struct uart_driver rp2_uart_driver = { 170 .owner = THIS_MODULE, 171 .driver_name = DRV_NAME, 172 .dev_name = "ttyRP", 173 .nr = CONFIG_SERIAL_RP2_NR_UARTS, 174 }; 175 176 struct rp2_card; 177 178 struct rp2_uart_port { 179 struct uart_port port; 180 int idx; 181 struct rp2_card *card; 182 void __iomem *asic_base; 183 void __iomem *base; 184 void __iomem *ucode; 185 }; 186 187 struct rp2_card { 188 struct pci_dev *pdev; 189 struct rp2_uart_port *ports; 190 int n_ports; 191 int initialized_ports; 192 int minor_start; 193 int smpte; 194 void __iomem *bar0; 195 void __iomem *bar1; 196 spinlock_t card_lock; 197 }; 198 199 #define RP_ID(prod) PCI_VDEVICE(RP, (prod)) 200 #define RP_CAP(ports, smpte) (((ports) << 8) | ((smpte) << 0)) 201 202 static inline void rp2_decode_cap(const struct pci_device_id *id, 203 int *ports, int *smpte) 204 { 205 *ports = id->driver_data >> 8; 206 *smpte = id->driver_data & 0xff; 207 } 208 209 static DEFINE_SPINLOCK(rp2_minor_lock); 210 static int rp2_minor_next; 211 212 static int rp2_alloc_ports(int n_ports) 213 { 214 int ret = -ENOSPC; 215 216 spin_lock(&rp2_minor_lock); 217 if (rp2_minor_next + n_ports <= CONFIG_SERIAL_RP2_NR_UARTS) { 218 /* sorry, no support for hot unplugging individual cards */ 219 ret = rp2_minor_next; 220 rp2_minor_next += n_ports; 221 } 222 spin_unlock(&rp2_minor_lock); 223 224 return ret; 225 } 226 227 static inline struct rp2_uart_port *port_to_up(struct uart_port *port) 228 { 229 return container_of(port, struct rp2_uart_port, port); 230 } 231 232 static void rp2_rmw(struct rp2_uart_port *up, int reg, 233 u32 clr_bits, u32 set_bits) 234 { 235 u32 tmp = readl(up->base + reg); 236 tmp &= ~clr_bits; 237 tmp |= set_bits; 238 writel(tmp, up->base + reg); 239 } 240 241 static void rp2_rmw_clr(struct rp2_uart_port *up, int reg, u32 val) 242 { 243 rp2_rmw(up, reg, val, 0); 244 } 245 246 static void rp2_rmw_set(struct rp2_uart_port *up, int reg, u32 val) 247 { 248 rp2_rmw(up, reg, 0, val); 249 } 250 251 static void rp2_mask_ch_irq(struct rp2_uart_port *up, int ch_num, 252 int is_enabled) 253 { 254 unsigned long flags, irq_mask; 255 256 spin_lock_irqsave(&up->card->card_lock, flags); 257 258 irq_mask = readl(up->asic_base + RP2_CH_IRQ_MASK); 259 if (is_enabled) 260 irq_mask &= ~BIT(ch_num); 261 else 262 irq_mask |= BIT(ch_num); 263 writel(irq_mask, up->asic_base + RP2_CH_IRQ_MASK); 264 265 spin_unlock_irqrestore(&up->card->card_lock, flags); 266 } 267 268 static unsigned int rp2_uart_tx_empty(struct uart_port *port) 269 { 270 struct rp2_uart_port *up = port_to_up(port); 271 unsigned long tx_fifo_bytes, flags; 272 273 /* 274 * This should probably check the transmitter, not the FIFO. 275 * But the TXEMPTY bit doesn't seem to work unless the TX IRQ is 276 * enabled. 277 */ 278 uart_port_lock_irqsave(&up->port, &flags); 279 tx_fifo_bytes = readw(up->base + RP2_TX_FIFO_COUNT); 280 uart_port_unlock_irqrestore(&up->port, flags); 281 282 return tx_fifo_bytes ? 0 : TIOCSER_TEMT; 283 } 284 285 static unsigned int rp2_uart_get_mctrl(struct uart_port *port) 286 { 287 struct rp2_uart_port *up = port_to_up(port); 288 u32 status; 289 290 status = readl(up->base + RP2_CHAN_STAT); 291 return ((status & RP2_CHAN_STAT_DCD_m) ? TIOCM_CAR : 0) | 292 ((status & RP2_CHAN_STAT_DSR_m) ? TIOCM_DSR : 0) | 293 ((status & RP2_CHAN_STAT_CTS_m) ? TIOCM_CTS : 0) | 294 ((status & RP2_CHAN_STAT_RI_m) ? TIOCM_RI : 0); 295 } 296 297 static void rp2_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) 298 { 299 rp2_rmw(port_to_up(port), RP2_TXRX_CTL, 300 RP2_TXRX_CTL_DTR_m | RP2_TXRX_CTL_RTS_m | RP2_TXRX_CTL_LOOP_m, 301 ((mctrl & TIOCM_DTR) ? RP2_TXRX_CTL_DTR_m : 0) | 302 ((mctrl & TIOCM_RTS) ? RP2_TXRX_CTL_RTS_m : 0) | 303 ((mctrl & TIOCM_LOOP) ? RP2_TXRX_CTL_LOOP_m : 0)); 304 } 305 306 static void rp2_uart_start_tx(struct uart_port *port) 307 { 308 rp2_rmw_set(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_TXIRQ_m); 309 } 310 311 static void rp2_uart_stop_tx(struct uart_port *port) 312 { 313 rp2_rmw_clr(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_TXIRQ_m); 314 } 315 316 static void rp2_uart_stop_rx(struct uart_port *port) 317 { 318 rp2_rmw_clr(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_RXIRQ_m); 319 } 320 321 static void rp2_uart_break_ctl(struct uart_port *port, int break_state) 322 { 323 unsigned long flags; 324 325 uart_port_lock_irqsave(port, &flags); 326 rp2_rmw(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_BREAK_m, 327 break_state ? RP2_TXRX_CTL_BREAK_m : 0); 328 uart_port_unlock_irqrestore(port, flags); 329 } 330 331 static void rp2_uart_enable_ms(struct uart_port *port) 332 { 333 rp2_rmw_set(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_MSRIRQ_m); 334 } 335 336 static void __rp2_uart_set_termios(struct rp2_uart_port *up, 337 unsigned long cfl, 338 unsigned long ifl, 339 unsigned int baud_div) 340 { 341 /* baud rate divisor (calculated elsewhere). 0 = divide-by-1 */ 342 writew(baud_div - 1, up->base + RP2_BAUD); 343 344 /* data bits and stop bits */ 345 rp2_rmw(up, RP2_UART_CTL, 346 RP2_UART_CTL_STOPBITS_m | RP2_UART_CTL_DATABITS_m, 347 ((cfl & CSTOPB) ? RP2_UART_CTL_STOPBITS_m : 0) | 348 (((cfl & CSIZE) == CS8) ? RP2_UART_CTL_DATABITS_8 : 0) | 349 (((cfl & CSIZE) == CS7) ? RP2_UART_CTL_DATABITS_7 : 0) | 350 (((cfl & CSIZE) == CS6) ? RP2_UART_CTL_DATABITS_6 : 0) | 351 (((cfl & CSIZE) == CS5) ? RP2_UART_CTL_DATABITS_5 : 0)); 352 353 /* parity and hardware flow control */ 354 rp2_rmw(up, RP2_TXRX_CTL, 355 RP2_TXRX_CTL_PARENB_m | RP2_TXRX_CTL_nPARODD_m | 356 RP2_TXRX_CTL_CMSPAR_m | RP2_TXRX_CTL_DTRFLOW_m | 357 RP2_TXRX_CTL_DSRFLOW_m | RP2_TXRX_CTL_RTSFLOW_m | 358 RP2_TXRX_CTL_CTSFLOW_m, 359 ((cfl & PARENB) ? RP2_TXRX_CTL_PARENB_m : 0) | 360 ((cfl & PARODD) ? 0 : RP2_TXRX_CTL_nPARODD_m) | 361 ((cfl & CMSPAR) ? RP2_TXRX_CTL_CMSPAR_m : 0) | 362 ((cfl & CRTSCTS) ? (RP2_TXRX_CTL_RTSFLOW_m | 363 RP2_TXRX_CTL_CTSFLOW_m) : 0)); 364 365 /* XON/XOFF software flow control */ 366 writeb((ifl & IXON) ? RP2_TX_SWFLOW_ena : RP2_TX_SWFLOW_dis, 367 up->ucode + RP2_TX_SWFLOW); 368 writeb((ifl & IXOFF) ? RP2_RX_SWFLOW_ena : RP2_RX_SWFLOW_dis, 369 up->ucode + RP2_RX_SWFLOW); 370 } 371 372 static void rp2_uart_set_termios(struct uart_port *port, struct ktermios *new, 373 const struct ktermios *old) 374 { 375 struct rp2_uart_port *up = port_to_up(port); 376 unsigned long flags; 377 unsigned int baud, baud_div; 378 379 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16); 380 baud_div = uart_get_divisor(port, baud); 381 382 if (tty_termios_baud_rate(new)) 383 tty_termios_encode_baud_rate(new, baud, baud); 384 385 uart_port_lock_irqsave(port, &flags); 386 387 /* ignore all characters if CREAD is not set */ 388 port->ignore_status_mask = (new->c_cflag & CREAD) ? 0 : RP2_DUMMY_READ; 389 390 __rp2_uart_set_termios(up, new->c_cflag, new->c_iflag, baud_div); 391 uart_update_timeout(port, new->c_cflag, baud); 392 393 uart_port_unlock_irqrestore(port, flags); 394 } 395 396 static void rp2_rx_chars(struct rp2_uart_port *up) 397 { 398 u16 bytes = readw(up->base + RP2_RX_FIFO_COUNT); 399 struct tty_port *port = &up->port.state->port; 400 401 for (; bytes != 0; bytes--) { 402 u32 byte = readw(up->base + RP2_DATA_BYTE) | RP2_DUMMY_READ; 403 u8 ch = byte & 0xff; 404 405 if (likely(!(byte & RP2_DATA_BYTE_EXCEPTION_MASK))) { 406 if (!uart_handle_sysrq_char(&up->port, ch)) 407 uart_insert_char(&up->port, byte, 0, ch, 408 TTY_NORMAL); 409 } else { 410 u8 flag = TTY_NORMAL; 411 412 if (byte & RP2_DATA_BYTE_BREAK_m) 413 flag = TTY_BREAK; 414 else if (byte & RP2_DATA_BYTE_ERR_FRAMING_m) 415 flag = TTY_FRAME; 416 else if (byte & RP2_DATA_BYTE_ERR_PARITY_m) 417 flag = TTY_PARITY; 418 uart_insert_char(&up->port, byte, 419 RP2_DATA_BYTE_ERR_OVERRUN_m, ch, flag); 420 } 421 up->port.icount.rx++; 422 } 423 424 tty_flip_buffer_push(port); 425 } 426 427 static void rp2_tx_chars(struct rp2_uart_port *up) 428 { 429 u8 ch; 430 431 uart_port_tx_limited(&up->port, ch, 432 FIFO_SIZE - readw(up->base + RP2_TX_FIFO_COUNT), 433 true, 434 writeb(ch, up->base + RP2_DATA_BYTE), 435 ({})); 436 } 437 438 static void rp2_ch_interrupt(struct rp2_uart_port *up) 439 { 440 u32 status; 441 442 uart_port_lock(&up->port); 443 444 /* 445 * The IRQ status bits are clear-on-write. Other status bits in 446 * this register aren't, so it's harmless to write to them. 447 */ 448 status = readl(up->base + RP2_CHAN_STAT); 449 writel(status, up->base + RP2_CHAN_STAT); 450 451 if (status & RP2_CHAN_STAT_RXDATA_m) 452 rp2_rx_chars(up); 453 if (status & RP2_CHAN_STAT_TXEMPTY_m) 454 rp2_tx_chars(up); 455 if (status & RP2_CHAN_STAT_MS_CHANGED_MASK) 456 wake_up_interruptible(&up->port.state->port.delta_msr_wait); 457 458 uart_port_unlock(&up->port); 459 } 460 461 static int rp2_asic_interrupt(struct rp2_card *card, unsigned int asic_id) 462 { 463 void __iomem *base = card->bar1 + RP2_ASIC_OFFSET(asic_id); 464 int ch, handled = 0; 465 unsigned long status = readl(base + RP2_CH_IRQ_STAT) & 466 ~readl(base + RP2_CH_IRQ_MASK); 467 468 for_each_set_bit(ch, &status, PORTS_PER_ASIC) { 469 rp2_ch_interrupt(&card->ports[ch]); 470 handled++; 471 } 472 return handled; 473 } 474 475 static irqreturn_t rp2_uart_interrupt(int irq, void *dev_id) 476 { 477 struct rp2_card *card = dev_id; 478 int handled; 479 480 handled = rp2_asic_interrupt(card, 0); 481 if (card->n_ports >= PORTS_PER_ASIC) 482 handled += rp2_asic_interrupt(card, 1); 483 484 return handled ? IRQ_HANDLED : IRQ_NONE; 485 } 486 487 static inline void rp2_flush_fifos(struct rp2_uart_port *up) 488 { 489 rp2_rmw_set(up, RP2_UART_CTL, 490 RP2_UART_CTL_FLUSH_RX_m | RP2_UART_CTL_FLUSH_TX_m); 491 readl(up->base + RP2_UART_CTL); 492 udelay(10); 493 rp2_rmw_clr(up, RP2_UART_CTL, 494 RP2_UART_CTL_FLUSH_RX_m | RP2_UART_CTL_FLUSH_TX_m); 495 } 496 497 static int rp2_uart_startup(struct uart_port *port) 498 { 499 struct rp2_uart_port *up = port_to_up(port); 500 501 rp2_flush_fifos(up); 502 rp2_rmw(up, RP2_TXRX_CTL, RP2_TXRX_CTL_MSRIRQ_m, RP2_TXRX_CTL_RXIRQ_m); 503 rp2_rmw(up, RP2_TXRX_CTL, RP2_TXRX_CTL_RX_TRIG_m, 504 RP2_TXRX_CTL_RX_TRIG_1); 505 rp2_rmw(up, RP2_CHAN_STAT, 0, 0); 506 rp2_mask_ch_irq(up, up->idx, 1); 507 508 return 0; 509 } 510 511 static void rp2_uart_shutdown(struct uart_port *port) 512 { 513 struct rp2_uart_port *up = port_to_up(port); 514 unsigned long flags; 515 516 rp2_uart_break_ctl(port, 0); 517 518 uart_port_lock_irqsave(port, &flags); 519 rp2_mask_ch_irq(up, up->idx, 0); 520 rp2_rmw(up, RP2_CHAN_STAT, 0, 0); 521 uart_port_unlock_irqrestore(port, flags); 522 } 523 524 static const char *rp2_uart_type(struct uart_port *port) 525 { 526 return (port->type == PORT_RP2) ? "RocketPort 2 UART" : NULL; 527 } 528 529 static void rp2_uart_release_port(struct uart_port *port) 530 { 531 /* Nothing to release ... */ 532 } 533 534 static int rp2_uart_request_port(struct uart_port *port) 535 { 536 /* UARTs always present */ 537 return 0; 538 } 539 540 static void rp2_uart_config_port(struct uart_port *port, int flags) 541 { 542 if (flags & UART_CONFIG_TYPE) 543 port->type = PORT_RP2; 544 } 545 546 static int rp2_uart_verify_port(struct uart_port *port, 547 struct serial_struct *ser) 548 { 549 if (ser->type != PORT_UNKNOWN && ser->type != PORT_RP2) 550 return -EINVAL; 551 552 return 0; 553 } 554 555 static const struct uart_ops rp2_uart_ops = { 556 .tx_empty = rp2_uart_tx_empty, 557 .set_mctrl = rp2_uart_set_mctrl, 558 .get_mctrl = rp2_uart_get_mctrl, 559 .stop_tx = rp2_uart_stop_tx, 560 .start_tx = rp2_uart_start_tx, 561 .stop_rx = rp2_uart_stop_rx, 562 .enable_ms = rp2_uart_enable_ms, 563 .break_ctl = rp2_uart_break_ctl, 564 .startup = rp2_uart_startup, 565 .shutdown = rp2_uart_shutdown, 566 .set_termios = rp2_uart_set_termios, 567 .type = rp2_uart_type, 568 .release_port = rp2_uart_release_port, 569 .request_port = rp2_uart_request_port, 570 .config_port = rp2_uart_config_port, 571 .verify_port = rp2_uart_verify_port, 572 }; 573 574 static void rp2_reset_asic(struct rp2_card *card, unsigned int asic_id) 575 { 576 void __iomem *base = card->bar1 + RP2_ASIC_OFFSET(asic_id); 577 u32 clk_cfg; 578 579 writew(1, base + RP2_GLOBAL_CMD); 580 readw(base + RP2_GLOBAL_CMD); 581 msleep(100); 582 writel(0, base + RP2_CLK_PRESCALER); 583 584 /* TDM clock configuration */ 585 clk_cfg = readw(base + RP2_ASIC_CFG); 586 clk_cfg = (clk_cfg & ~BIT(8)) | BIT(9); 587 writew(clk_cfg, base + RP2_ASIC_CFG); 588 589 /* IRQ routing */ 590 writel(ALL_PORTS_MASK, base + RP2_CH_IRQ_MASK); 591 writel(RP2_ASIC_IRQ_EN_m, base + RP2_ASIC_IRQ); 592 } 593 594 static void rp2_init_card(struct rp2_card *card) 595 { 596 writel(4, card->bar0 + RP2_FPGA_CTL0); 597 writel(0, card->bar0 + RP2_FPGA_CTL1); 598 599 rp2_reset_asic(card, 0); 600 if (card->n_ports >= PORTS_PER_ASIC) 601 rp2_reset_asic(card, 1); 602 603 writel(RP2_IRQ_MASK_EN_m, card->bar0 + RP2_IRQ_MASK); 604 } 605 606 static void rp2_init_port(struct rp2_uart_port *up, const struct firmware *fw) 607 { 608 int i; 609 610 writel(RP2_UART_CTL_RESET_CH_m, up->base + RP2_UART_CTL); 611 readl(up->base + RP2_UART_CTL); 612 udelay(1); 613 614 writel(0, up->base + RP2_TXRX_CTL); 615 writel(0, up->base + RP2_UART_CTL); 616 readl(up->base + RP2_UART_CTL); 617 udelay(1); 618 619 rp2_flush_fifos(up); 620 621 for (i = 0; i < min_t(int, fw->size, RP2_UCODE_BYTES); i++) 622 writeb(fw->data[i], up->ucode + i); 623 624 __rp2_uart_set_termios(up, CS8 | CREAD | CLOCAL, 0, DEFAULT_BAUD_DIV); 625 rp2_uart_set_mctrl(&up->port, 0); 626 627 writeb(RP2_RX_FIFO_ena, up->ucode + RP2_RX_FIFO); 628 rp2_rmw(up, RP2_UART_CTL, RP2_UART_CTL_MODE_m, 629 RP2_UART_CTL_XMIT_EN_m | RP2_UART_CTL_MODE_rs232); 630 rp2_rmw_set(up, RP2_TXRX_CTL, 631 RP2_TXRX_CTL_TX_EN_m | RP2_TXRX_CTL_RX_EN_m); 632 } 633 634 static void rp2_remove_ports(struct rp2_card *card) 635 { 636 int i; 637 638 for (i = 0; i < card->initialized_ports; i++) 639 uart_remove_one_port(&rp2_uart_driver, &card->ports[i].port); 640 card->initialized_ports = 0; 641 } 642 643 static int rp2_load_firmware(struct rp2_card *card, const struct firmware *fw) 644 { 645 resource_size_t phys_base; 646 int i, rc = 0; 647 648 phys_base = pci_resource_start(card->pdev, 1); 649 650 for (i = 0; i < card->n_ports; i++) { 651 struct rp2_uart_port *rp = &card->ports[i]; 652 struct uart_port *p; 653 int j = (unsigned)i % PORTS_PER_ASIC; 654 655 rp->asic_base = card->bar1; 656 rp->base = card->bar1 + RP2_PORT_BASE + j*RP2_PORT_SPACING; 657 rp->ucode = card->bar1 + RP2_UCODE_BASE + j*RP2_UCODE_SPACING; 658 rp->card = card; 659 rp->idx = j; 660 661 p = &rp->port; 662 p->line = card->minor_start + i; 663 p->dev = &card->pdev->dev; 664 p->type = PORT_RP2; 665 p->iotype = UPIO_MEM32; 666 p->uartclk = UART_CLOCK; 667 p->regshift = 2; 668 p->fifosize = FIFO_SIZE; 669 p->ops = &rp2_uart_ops; 670 p->irq = card->pdev->irq; 671 p->membase = rp->base; 672 p->mapbase = phys_base + RP2_PORT_BASE + j*RP2_PORT_SPACING; 673 674 if (i >= PORTS_PER_ASIC) { 675 rp->asic_base += RP2_ASIC_SPACING; 676 rp->base += RP2_ASIC_SPACING; 677 rp->ucode += RP2_ASIC_SPACING; 678 p->mapbase += RP2_ASIC_SPACING; 679 } 680 681 rp2_init_port(rp, fw); 682 rc = uart_add_one_port(&rp2_uart_driver, p); 683 if (rc) { 684 dev_err(&card->pdev->dev, 685 "error registering port %d: %d\n", i, rc); 686 rp2_remove_ports(card); 687 break; 688 } 689 card->initialized_ports++; 690 } 691 692 return rc; 693 } 694 695 static int rp2_probe(struct pci_dev *pdev, 696 const struct pci_device_id *id) 697 { 698 const struct firmware *fw; 699 struct rp2_card *card; 700 struct rp2_uart_port *ports; 701 void __iomem * const *bars; 702 int rc; 703 704 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL); 705 if (!card) 706 return -ENOMEM; 707 pci_set_drvdata(pdev, card); 708 spin_lock_init(&card->card_lock); 709 710 rc = pcim_enable_device(pdev); 711 if (rc) 712 return rc; 713 714 rc = pcim_iomap_regions_request_all(pdev, 0x03, DRV_NAME); 715 if (rc) 716 return rc; 717 718 bars = pcim_iomap_table(pdev); 719 card->bar0 = bars[0]; 720 card->bar1 = bars[1]; 721 card->pdev = pdev; 722 723 rp2_decode_cap(id, &card->n_ports, &card->smpte); 724 dev_info(&pdev->dev, "found new card with %d ports\n", card->n_ports); 725 726 card->minor_start = rp2_alloc_ports(card->n_ports); 727 if (card->minor_start < 0) { 728 dev_err(&pdev->dev, 729 "too many ports (try increasing CONFIG_SERIAL_RP2_NR_UARTS)\n"); 730 return -EINVAL; 731 } 732 733 rp2_init_card(card); 734 735 ports = devm_kcalloc(&pdev->dev, card->n_ports, sizeof(*ports), 736 GFP_KERNEL); 737 if (!ports) 738 return -ENOMEM; 739 card->ports = ports; 740 741 rc = request_firmware(&fw, RP2_FW_NAME, &pdev->dev); 742 if (rc < 0) { 743 dev_err(&pdev->dev, "cannot find '%s' firmware image\n", 744 RP2_FW_NAME); 745 return rc; 746 } 747 748 rc = rp2_load_firmware(card, fw); 749 750 release_firmware(fw); 751 if (rc < 0) 752 return rc; 753 754 rc = devm_request_irq(&pdev->dev, pdev->irq, rp2_uart_interrupt, 755 IRQF_SHARED, DRV_NAME, card); 756 if (rc) 757 return rc; 758 759 return 0; 760 } 761 762 static void rp2_remove(struct pci_dev *pdev) 763 { 764 struct rp2_card *card = pci_get_drvdata(pdev); 765 766 rp2_remove_ports(card); 767 } 768 769 static const struct pci_device_id rp2_pci_tbl[] = { 770 771 /* RocketPort INFINITY cards */ 772 773 { RP_ID(0x0040), RP_CAP(8, 0) }, /* INF Octa, RJ45, selectable */ 774 { RP_ID(0x0041), RP_CAP(32, 0) }, /* INF 32, ext interface */ 775 { RP_ID(0x0042), RP_CAP(8, 0) }, /* INF Octa, ext interface */ 776 { RP_ID(0x0043), RP_CAP(16, 0) }, /* INF 16, ext interface */ 777 { RP_ID(0x0044), RP_CAP(4, 0) }, /* INF Quad, DB, selectable */ 778 { RP_ID(0x0045), RP_CAP(8, 0) }, /* INF Octa, DB, selectable */ 779 { RP_ID(0x0046), RP_CAP(4, 0) }, /* INF Quad, ext interface */ 780 { RP_ID(0x0047), RP_CAP(4, 0) }, /* INF Quad, RJ45 */ 781 { RP_ID(0x004a), RP_CAP(4, 0) }, /* INF Plus, Quad */ 782 { RP_ID(0x004b), RP_CAP(8, 0) }, /* INF Plus, Octa */ 783 { RP_ID(0x004c), RP_CAP(8, 0) }, /* INF III, Octa */ 784 { RP_ID(0x004d), RP_CAP(4, 0) }, /* INF III, Quad */ 785 { RP_ID(0x004e), RP_CAP(2, 0) }, /* INF Plus, 2, RS232 */ 786 { RP_ID(0x004f), RP_CAP(2, 1) }, /* INF Plus, 2, SMPTE */ 787 { RP_ID(0x0050), RP_CAP(4, 0) }, /* INF Plus, Quad, RJ45 */ 788 { RP_ID(0x0051), RP_CAP(8, 0) }, /* INF Plus, Octa, RJ45 */ 789 { RP_ID(0x0052), RP_CAP(8, 1) }, /* INF Octa, SMPTE */ 790 791 /* RocketPort EXPRESS cards */ 792 793 { RP_ID(0x0060), RP_CAP(8, 0) }, /* EXP Octa, RJ45, selectable */ 794 { RP_ID(0x0061), RP_CAP(32, 0) }, /* EXP 32, ext interface */ 795 { RP_ID(0x0062), RP_CAP(8, 0) }, /* EXP Octa, ext interface */ 796 { RP_ID(0x0063), RP_CAP(16, 0) }, /* EXP 16, ext interface */ 797 { RP_ID(0x0064), RP_CAP(4, 0) }, /* EXP Quad, DB, selectable */ 798 { RP_ID(0x0065), RP_CAP(8, 0) }, /* EXP Octa, DB, selectable */ 799 { RP_ID(0x0066), RP_CAP(4, 0) }, /* EXP Quad, ext interface */ 800 { RP_ID(0x0067), RP_CAP(4, 0) }, /* EXP Quad, RJ45 */ 801 { RP_ID(0x0068), RP_CAP(8, 0) }, /* EXP Octa, RJ11 */ 802 { RP_ID(0x0072), RP_CAP(8, 1) }, /* EXP Octa, SMPTE */ 803 { } 804 }; 805 MODULE_DEVICE_TABLE(pci, rp2_pci_tbl); 806 807 static struct pci_driver rp2_pci_driver = { 808 .name = DRV_NAME, 809 .id_table = rp2_pci_tbl, 810 .probe = rp2_probe, 811 .remove = rp2_remove, 812 }; 813 814 static int __init rp2_uart_init(void) 815 { 816 int rc; 817 818 rc = uart_register_driver(&rp2_uart_driver); 819 if (rc) 820 return rc; 821 822 rc = pci_register_driver(&rp2_pci_driver); 823 if (rc) { 824 uart_unregister_driver(&rp2_uart_driver); 825 return rc; 826 } 827 828 return 0; 829 } 830 831 static void __exit rp2_uart_exit(void) 832 { 833 pci_unregister_driver(&rp2_pci_driver); 834 uart_unregister_driver(&rp2_uart_driver); 835 } 836 837 module_init(rp2_uart_init); 838 module_exit(rp2_uart_exit); 839 840 MODULE_DESCRIPTION("Comtrol RocketPort EXPRESS/INFINITY driver"); 841 MODULE_AUTHOR("Kevin Cernekee <cernekee@gmail.com>"); 842 MODULE_LICENSE("GPL v2"); 843 MODULE_FIRMWARE(RP2_FW_NAME); 844