1 /* 2 * Cyclades PC300 synchronous serial card driver for Linux 3 * 4 * Copyright (C) 2000-2008 Krzysztof Halasa <khc@pm.waw.pl> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of version 2 of the GNU General Public License 8 * as published by the Free Software Foundation. 9 * 10 * For information see <http://www.kernel.org/pub/linux/utils/net/hdlc/>. 11 * 12 * Sources of information: 13 * Hitachi HD64572 SCA-II User's Manual 14 * Original Cyclades PC300 Linux driver 15 * 16 * This driver currently supports only PC300/RSV (V.24/V.35) and 17 * PC300/X21 cards. 18 */ 19 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 22 #include <linux/module.h> 23 #include <linux/kernel.h> 24 #include <linux/slab.h> 25 #include <linux/sched.h> 26 #include <linux/types.h> 27 #include <linux/fcntl.h> 28 #include <linux/in.h> 29 #include <linux/string.h> 30 #include <linux/errno.h> 31 #include <linux/init.h> 32 #include <linux/ioport.h> 33 #include <linux/moduleparam.h> 34 #include <linux/netdevice.h> 35 #include <linux/hdlc.h> 36 #include <linux/pci.h> 37 #include <linux/delay.h> 38 #include <asm/io.h> 39 40 #include "hd64572.h" 41 42 #undef DEBUG_PKT 43 #define DEBUG_RINGS 44 45 #define PC300_PLX_SIZE 0x80 /* PLX control window size (128 B) */ 46 #define PC300_SCA_SIZE 0x400 /* SCA window size (1 KB) */ 47 #define MAX_TX_BUFFERS 10 48 49 static int pci_clock_freq = 33000000; 50 static int use_crystal_clock = 0; 51 static unsigned int CLOCK_BASE; 52 53 /* Masks to access the init_ctrl PLX register */ 54 #define PC300_CLKSEL_MASK (0x00000004UL) 55 #define PC300_CHMEDIA_MASK(port) (0x00000020UL << ((port) * 3)) 56 #define PC300_CTYPE_MASK (0x00000800UL) 57 58 59 enum { PC300_RSV = 1, PC300_X21, PC300_TE }; /* card types */ 60 61 /* 62 * PLX PCI9050-1 local configuration and shared runtime registers. 63 * This structure can be used to access 9050 registers (memory mapped). 64 */ 65 typedef struct { 66 u32 loc_addr_range[4]; /* 00-0Ch : Local Address Ranges */ 67 u32 loc_rom_range; /* 10h : Local ROM Range */ 68 u32 loc_addr_base[4]; /* 14-20h : Local Address Base Addrs */ 69 u32 loc_rom_base; /* 24h : Local ROM Base */ 70 u32 loc_bus_descr[4]; /* 28-34h : Local Bus Descriptors */ 71 u32 rom_bus_descr; /* 38h : ROM Bus Descriptor */ 72 u32 cs_base[4]; /* 3C-48h : Chip Select Base Addrs */ 73 u32 intr_ctrl_stat; /* 4Ch : Interrupt Control/Status */ 74 u32 init_ctrl; /* 50h : EEPROM ctrl, Init Ctrl, etc */ 75 }plx9050; 76 77 78 79 typedef struct port_s { 80 struct napi_struct napi; 81 struct net_device *netdev; 82 struct card_s *card; 83 spinlock_t lock; /* TX lock */ 84 sync_serial_settings settings; 85 int rxpart; /* partial frame received, next frame invalid*/ 86 unsigned short encoding; 87 unsigned short parity; 88 unsigned int iface; 89 u16 rxin; /* rx ring buffer 'in' pointer */ 90 u16 txin; /* tx ring buffer 'in' and 'last' pointers */ 91 u16 txlast; 92 u8 rxs, txs, tmc; /* SCA registers */ 93 u8 chan; /* physical port # - 0 or 1 */ 94 }port_t; 95 96 97 98 typedef struct card_s { 99 int type; /* RSV, X21, etc. */ 100 int n_ports; /* 1 or 2 ports */ 101 u8 __iomem *rambase; /* buffer memory base (virtual) */ 102 u8 __iomem *scabase; /* SCA memory base (virtual) */ 103 plx9050 __iomem *plxbase; /* PLX registers memory base (virtual) */ 104 u32 init_ctrl_value; /* Saved value - 9050 bug workaround */ 105 u16 rx_ring_buffers; /* number of buffers in a ring */ 106 u16 tx_ring_buffers; 107 u16 buff_offset; /* offset of first buffer of first channel */ 108 u8 irq; /* interrupt request level */ 109 110 port_t ports[2]; 111 }card_t; 112 113 114 #define get_port(card, port) ((port) < (card)->n_ports ? \ 115 (&(card)->ports[port]) : (NULL)) 116 117 #include "hd64572.c" 118 119 120 static void pc300_set_iface(port_t *port) 121 { 122 card_t *card = port->card; 123 u32 __iomem * init_ctrl = &card->plxbase->init_ctrl; 124 u16 msci = get_msci(port); 125 u8 rxs = port->rxs & CLK_BRG_MASK; 126 u8 txs = port->txs & CLK_BRG_MASK; 127 128 sca_out(EXS_TES1, (port->chan ? MSCI1_OFFSET : MSCI0_OFFSET) + EXS, 129 port->card); 130 switch(port->settings.clock_type) { 131 case CLOCK_INT: 132 rxs |= CLK_BRG; /* BRG output */ 133 txs |= CLK_PIN_OUT | CLK_TX_RXCLK; /* RX clock */ 134 break; 135 136 case CLOCK_TXINT: 137 rxs |= CLK_LINE; /* RXC input */ 138 txs |= CLK_PIN_OUT | CLK_BRG; /* BRG output */ 139 break; 140 141 case CLOCK_TXFROMRX: 142 rxs |= CLK_LINE; /* RXC input */ 143 txs |= CLK_PIN_OUT | CLK_TX_RXCLK; /* RX clock */ 144 break; 145 146 default: /* EXTernal clock */ 147 rxs |= CLK_LINE; /* RXC input */ 148 txs |= CLK_PIN_OUT | CLK_LINE; /* TXC input */ 149 break; 150 } 151 152 port->rxs = rxs; 153 port->txs = txs; 154 sca_out(rxs, msci + RXS, card); 155 sca_out(txs, msci + TXS, card); 156 sca_set_port(port); 157 158 if (port->card->type == PC300_RSV) { 159 if (port->iface == IF_IFACE_V35) 160 writel(card->init_ctrl_value | 161 PC300_CHMEDIA_MASK(port->chan), init_ctrl); 162 else 163 writel(card->init_ctrl_value & 164 ~PC300_CHMEDIA_MASK(port->chan), init_ctrl); 165 } 166 } 167 168 169 170 static int pc300_open(struct net_device *dev) 171 { 172 port_t *port = dev_to_port(dev); 173 174 int result = hdlc_open(dev); 175 if (result) 176 return result; 177 178 sca_open(dev); 179 pc300_set_iface(port); 180 return 0; 181 } 182 183 184 185 static int pc300_close(struct net_device *dev) 186 { 187 sca_close(dev); 188 hdlc_close(dev); 189 return 0; 190 } 191 192 193 194 static int pc300_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 195 { 196 const size_t size = sizeof(sync_serial_settings); 197 sync_serial_settings new_line; 198 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync; 199 int new_type; 200 port_t *port = dev_to_port(dev); 201 202 #ifdef DEBUG_RINGS 203 if (cmd == SIOCDEVPRIVATE) { 204 sca_dump_rings(dev); 205 return 0; 206 } 207 #endif 208 if (cmd != SIOCWANDEV) 209 return hdlc_ioctl(dev, ifr, cmd); 210 211 if (ifr->ifr_settings.type == IF_GET_IFACE) { 212 ifr->ifr_settings.type = port->iface; 213 if (ifr->ifr_settings.size < size) { 214 ifr->ifr_settings.size = size; /* data size wanted */ 215 return -ENOBUFS; 216 } 217 if (copy_to_user(line, &port->settings, size)) 218 return -EFAULT; 219 return 0; 220 221 } 222 223 if (port->card->type == PC300_X21 && 224 (ifr->ifr_settings.type == IF_IFACE_SYNC_SERIAL || 225 ifr->ifr_settings.type == IF_IFACE_X21)) 226 new_type = IF_IFACE_X21; 227 228 else if (port->card->type == PC300_RSV && 229 (ifr->ifr_settings.type == IF_IFACE_SYNC_SERIAL || 230 ifr->ifr_settings.type == IF_IFACE_V35)) 231 new_type = IF_IFACE_V35; 232 233 else if (port->card->type == PC300_RSV && 234 ifr->ifr_settings.type == IF_IFACE_V24) 235 new_type = IF_IFACE_V24; 236 237 else 238 return hdlc_ioctl(dev, ifr, cmd); 239 240 if (!capable(CAP_NET_ADMIN)) 241 return -EPERM; 242 243 if (copy_from_user(&new_line, line, size)) 244 return -EFAULT; 245 246 if (new_line.clock_type != CLOCK_EXT && 247 new_line.clock_type != CLOCK_TXFROMRX && 248 new_line.clock_type != CLOCK_INT && 249 new_line.clock_type != CLOCK_TXINT) 250 return -EINVAL; /* No such clock setting */ 251 252 if (new_line.loopback != 0 && new_line.loopback != 1) 253 return -EINVAL; 254 255 memcpy(&port->settings, &new_line, size); /* Update settings */ 256 port->iface = new_type; 257 pc300_set_iface(port); 258 return 0; 259 } 260 261 262 263 static void pc300_pci_remove_one(struct pci_dev *pdev) 264 { 265 int i; 266 card_t *card = pci_get_drvdata(pdev); 267 268 for (i = 0; i < 2; i++) 269 if (card->ports[i].card) 270 unregister_hdlc_device(card->ports[i].netdev); 271 272 if (card->irq) 273 free_irq(card->irq, card); 274 275 if (card->rambase) 276 iounmap(card->rambase); 277 if (card->scabase) 278 iounmap(card->scabase); 279 if (card->plxbase) 280 iounmap(card->plxbase); 281 282 pci_release_regions(pdev); 283 pci_disable_device(pdev); 284 pci_set_drvdata(pdev, NULL); 285 if (card->ports[0].netdev) 286 free_netdev(card->ports[0].netdev); 287 if (card->ports[1].netdev) 288 free_netdev(card->ports[1].netdev); 289 kfree(card); 290 } 291 292 static const struct net_device_ops pc300_ops = { 293 .ndo_open = pc300_open, 294 .ndo_stop = pc300_close, 295 .ndo_change_mtu = hdlc_change_mtu, 296 .ndo_start_xmit = hdlc_start_xmit, 297 .ndo_do_ioctl = pc300_ioctl, 298 }; 299 300 static int __devinit pc300_pci_init_one(struct pci_dev *pdev, 301 const struct pci_device_id *ent) 302 { 303 card_t *card; 304 u32 __iomem *p; 305 int i; 306 u32 ramsize; 307 u32 ramphys; /* buffer memory base */ 308 u32 scaphys; /* SCA memory base */ 309 u32 plxphys; /* PLX registers memory base */ 310 311 i = pci_enable_device(pdev); 312 if (i) 313 return i; 314 315 i = pci_request_regions(pdev, "PC300"); 316 if (i) { 317 pci_disable_device(pdev); 318 return i; 319 } 320 321 card = kzalloc(sizeof(card_t), GFP_KERNEL); 322 if (card == NULL) { 323 pci_release_regions(pdev); 324 pci_disable_device(pdev); 325 return -ENOBUFS; 326 } 327 pci_set_drvdata(pdev, card); 328 329 if (pci_resource_len(pdev, 0) != PC300_PLX_SIZE || 330 pci_resource_len(pdev, 2) != PC300_SCA_SIZE || 331 pci_resource_len(pdev, 3) < 16384) { 332 pr_err("invalid card EEPROM parameters\n"); 333 pc300_pci_remove_one(pdev); 334 return -EFAULT; 335 } 336 337 plxphys = pci_resource_start(pdev, 0) & PCI_BASE_ADDRESS_MEM_MASK; 338 card->plxbase = ioremap(plxphys, PC300_PLX_SIZE); 339 340 scaphys = pci_resource_start(pdev, 2) & PCI_BASE_ADDRESS_MEM_MASK; 341 card->scabase = ioremap(scaphys, PC300_SCA_SIZE); 342 343 ramphys = pci_resource_start(pdev, 3) & PCI_BASE_ADDRESS_MEM_MASK; 344 card->rambase = pci_ioremap_bar(pdev, 3); 345 346 if (card->plxbase == NULL || 347 card->scabase == NULL || 348 card->rambase == NULL) { 349 pr_err("ioremap() failed\n"); 350 pc300_pci_remove_one(pdev); 351 } 352 353 /* PLX PCI 9050 workaround for local configuration register read bug */ 354 pci_write_config_dword(pdev, PCI_BASE_ADDRESS_0, scaphys); 355 card->init_ctrl_value = readl(&((plx9050 __iomem *)card->scabase)->init_ctrl); 356 pci_write_config_dword(pdev, PCI_BASE_ADDRESS_0, plxphys); 357 358 if (pdev->device == PCI_DEVICE_ID_PC300_TE_1 || 359 pdev->device == PCI_DEVICE_ID_PC300_TE_2) 360 card->type = PC300_TE; /* not fully supported */ 361 else if (card->init_ctrl_value & PC300_CTYPE_MASK) 362 card->type = PC300_X21; 363 else 364 card->type = PC300_RSV; 365 366 if (pdev->device == PCI_DEVICE_ID_PC300_RX_1 || 367 pdev->device == PCI_DEVICE_ID_PC300_TE_1) 368 card->n_ports = 1; 369 else 370 card->n_ports = 2; 371 372 for (i = 0; i < card->n_ports; i++) 373 if (!(card->ports[i].netdev = alloc_hdlcdev(&card->ports[i]))) { 374 pr_err("unable to allocate memory\n"); 375 pc300_pci_remove_one(pdev); 376 return -ENOMEM; 377 } 378 379 /* Reset PLX */ 380 p = &card->plxbase->init_ctrl; 381 writel(card->init_ctrl_value | 0x40000000, p); 382 readl(p); /* Flush the write - do not use sca_flush */ 383 udelay(1); 384 385 writel(card->init_ctrl_value, p); 386 readl(p); /* Flush the write - do not use sca_flush */ 387 udelay(1); 388 389 /* Reload Config. Registers from EEPROM */ 390 writel(card->init_ctrl_value | 0x20000000, p); 391 readl(p); /* Flush the write - do not use sca_flush */ 392 udelay(1); 393 394 writel(card->init_ctrl_value, p); 395 readl(p); /* Flush the write - do not use sca_flush */ 396 udelay(1); 397 398 ramsize = sca_detect_ram(card, card->rambase, 399 pci_resource_len(pdev, 3)); 400 401 if (use_crystal_clock) 402 card->init_ctrl_value &= ~PC300_CLKSEL_MASK; 403 else 404 card->init_ctrl_value |= PC300_CLKSEL_MASK; 405 406 writel(card->init_ctrl_value, &card->plxbase->init_ctrl); 407 /* number of TX + RX buffers for one port */ 408 i = ramsize / (card->n_ports * (sizeof(pkt_desc) + HDLC_MAX_MRU)); 409 card->tx_ring_buffers = min(i / 2, MAX_TX_BUFFERS); 410 card->rx_ring_buffers = i - card->tx_ring_buffers; 411 412 card->buff_offset = card->n_ports * sizeof(pkt_desc) * 413 (card->tx_ring_buffers + card->rx_ring_buffers); 414 415 pr_info("PC300/%s, %u KB RAM at 0x%x, IRQ%u, using %u TX + %u RX packets rings\n", 416 card->type == PC300_X21 ? "X21" : 417 card->type == PC300_TE ? "TE" : "RSV", 418 ramsize / 1024, ramphys, pdev->irq, 419 card->tx_ring_buffers, card->rx_ring_buffers); 420 421 if (card->tx_ring_buffers < 1) { 422 pr_err("RAM test failed\n"); 423 pc300_pci_remove_one(pdev); 424 return -EFAULT; 425 } 426 427 /* Enable interrupts on the PCI bridge, LINTi1 active low */ 428 writew(0x0041, &card->plxbase->intr_ctrl_stat); 429 430 /* Allocate IRQ */ 431 if (request_irq(pdev->irq, sca_intr, IRQF_SHARED, "pc300", card)) { 432 pr_warn("could not allocate IRQ%d\n", pdev->irq); 433 pc300_pci_remove_one(pdev); 434 return -EBUSY; 435 } 436 card->irq = pdev->irq; 437 438 sca_init(card, 0); 439 440 // COTE not set - allows better TX DMA settings 441 // sca_out(sca_in(PCR, card) | PCR_COTE, PCR, card); 442 443 sca_out(0x10, BTCR, card); 444 445 for (i = 0; i < card->n_ports; i++) { 446 port_t *port = &card->ports[i]; 447 struct net_device *dev = port->netdev; 448 hdlc_device *hdlc = dev_to_hdlc(dev); 449 port->chan = i; 450 451 spin_lock_init(&port->lock); 452 dev->irq = card->irq; 453 dev->mem_start = ramphys; 454 dev->mem_end = ramphys + ramsize - 1; 455 dev->tx_queue_len = 50; 456 dev->netdev_ops = &pc300_ops; 457 hdlc->attach = sca_attach; 458 hdlc->xmit = sca_xmit; 459 port->settings.clock_type = CLOCK_EXT; 460 port->card = card; 461 if (card->type == PC300_X21) 462 port->iface = IF_IFACE_X21; 463 else 464 port->iface = IF_IFACE_V35; 465 466 sca_init_port(port); 467 if (register_hdlc_device(dev)) { 468 pr_err("unable to register hdlc device\n"); 469 port->card = NULL; 470 pc300_pci_remove_one(pdev); 471 return -ENOBUFS; 472 } 473 474 netdev_info(dev, "PC300 channel %d\n", port->chan); 475 } 476 return 0; 477 } 478 479 480 481 static DEFINE_PCI_DEVICE_TABLE(pc300_pci_tbl) = { 482 { PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_PC300_RX_1, PCI_ANY_ID, 483 PCI_ANY_ID, 0, 0, 0 }, 484 { PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_PC300_RX_2, PCI_ANY_ID, 485 PCI_ANY_ID, 0, 0, 0 }, 486 { PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_PC300_TE_1, PCI_ANY_ID, 487 PCI_ANY_ID, 0, 0, 0 }, 488 { PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_PC300_TE_2, PCI_ANY_ID, 489 PCI_ANY_ID, 0, 0, 0 }, 490 { 0, } 491 }; 492 493 494 static struct pci_driver pc300_pci_driver = { 495 .name = "PC300", 496 .id_table = pc300_pci_tbl, 497 .probe = pc300_pci_init_one, 498 .remove = pc300_pci_remove_one, 499 }; 500 501 502 static int __init pc300_init_module(void) 503 { 504 if (pci_clock_freq < 1000000 || pci_clock_freq > 80000000) { 505 pr_err("Invalid PCI clock frequency\n"); 506 return -EINVAL; 507 } 508 if (use_crystal_clock != 0 && use_crystal_clock != 1) { 509 pr_err("Invalid 'use_crystal_clock' value\n"); 510 return -EINVAL; 511 } 512 513 CLOCK_BASE = use_crystal_clock ? 24576000 : pci_clock_freq; 514 515 return pci_register_driver(&pc300_pci_driver); 516 } 517 518 519 520 static void __exit pc300_cleanup_module(void) 521 { 522 pci_unregister_driver(&pc300_pci_driver); 523 } 524 525 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 526 MODULE_DESCRIPTION("Cyclades PC300 serial port driver"); 527 MODULE_LICENSE("GPL v2"); 528 MODULE_DEVICE_TABLE(pci, pc300_pci_tbl); 529 module_param(pci_clock_freq, int, 0444); 530 MODULE_PARM_DESC(pci_clock_freq, "System PCI clock frequency in Hz"); 531 module_param(use_crystal_clock, int, 0444); 532 MODULE_PARM_DESC(use_crystal_clock, 533 "Use 24.576 MHz clock instead of PCI clock"); 534 module_init(pc300_init_module); 535 module_exit(pc300_cleanup_module); 536