drivers/tty/serial/jsm/jsm_driver.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /************************************************************************
   3  * Copyright 2003 Digi International (www.digi.com)
   4  *
   5  * Copyright (C) 2004 IBM Corporation. All rights reserved.
   6  *
   7  * Contact Information:
   8  * Scott H Kilau <Scott_Kilau@digi.com>
   9  * Wendy Xiong   <wendyx@us.ibm.com>
  10  *
  11  *
  12  ***********************************************************************/
  13 #include <linux/module.h>
  14 #include <linux/pci.h>
  15 #include <linux/slab.h>
  16
  17 #include "jsm.h"
  18
  19 MODULE_AUTHOR("Digi International, https://www.digi.com");
  20 MODULE_DESCRIPTION("Driver for the Digi International Neo and Classic PCI based product line");
  21 MODULE_LICENSE("GPL");
  22
  23 #define JSM_DRIVER_NAME "jsm"
  24 #define NR_PORTS        32
  25 #define JSM_MINOR_START 0
  26
  27 struct uart_driver jsm_uart_driver = {
  28         .owner          = THIS_MODULE,
  29         .driver_name    = JSM_DRIVER_NAME,
  30         .dev_name       = "ttyn",
  31         .major          = 0,
  32         .minor          = JSM_MINOR_START,
  33         .nr             = NR_PORTS,
  34 };
  35
  36 static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
  37                                         pci_channel_state_t state);
  38 static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev);
  39 static void jsm_io_resume(struct pci_dev *pdev);
  40
  41 static const struct pci_error_handlers jsm_err_handler = {
  42         .error_detected = jsm_io_error_detected,
  43         .slot_reset = jsm_io_slot_reset,
  44         .resume = jsm_io_resume,
  45 };
  46
  47 int jsm_debug;
  48 module_param(jsm_debug, int, 0);
  49 MODULE_PARM_DESC(jsm_debug, "Driver debugging level");
  50
  51 static int jsm_probe_one(struct pci_dev *pdev, const struct pci_device_id *ent)
  52 {
  53         int rc = 0;
  54         struct jsm_board *brd;
  55         static int adapter_count;
  56
  57         rc = pci_enable_device(pdev);
  58         if (rc) {
  59                 dev_err(&pdev->dev, "Device enable FAILED\n");
  60                 goto out;
  61         }
  62
  63         rc = pci_request_regions(pdev, JSM_DRIVER_NAME);
  64         if (rc) {
  65                 dev_err(&pdev->dev, "pci_request_region FAILED\n");
  66                 goto out_disable_device;
  67         }
  68
  69         brd = kzalloc(sizeof(*brd), GFP_KERNEL);
  70         if (!brd) {
  71                 rc = -ENOMEM;
  72                 goto out_release_regions;
  73         }
  74
  75         /* store the info for the board we've found */
  76         brd->boardnum = adapter_count++;
  77         brd->pci_dev = pdev;
  78
  79         switch (pdev->device) {
  80         case PCI_DEVICE_ID_NEO_2DB9:
  81         case PCI_DEVICE_ID_NEO_2DB9PRI:
  82         case PCI_DEVICE_ID_NEO_2RJ45:
  83         case PCI_DEVICE_ID_NEO_2RJ45PRI:
  84         case PCI_DEVICE_ID_NEO_2_422_485:
  85                 brd->maxports = 2;
  86                 break;
  87
  88         case PCI_DEVICE_ID_CLASSIC_4:
  89         case PCI_DEVICE_ID_CLASSIC_4_422:
  90         case PCI_DEVICE_ID_NEO_4:
  91         case PCIE_DEVICE_ID_NEO_4:
  92         case PCIE_DEVICE_ID_NEO_4RJ45:
  93         case PCIE_DEVICE_ID_NEO_4_IBM:
  94                 brd->maxports = 4;
  95                 break;
  96
  97         case PCI_DEVICE_ID_CLASSIC_8:
  98         case PCI_DEVICE_ID_CLASSIC_8_422:
  99         case PCI_DEVICE_ID_DIGI_NEO_8:
 100         case PCIE_DEVICE_ID_NEO_8:
 101         case PCIE_DEVICE_ID_NEO_8RJ45:
 102                 brd->maxports = 8;
 103                 break;
 104
 105         default:
 106                 brd->maxports = 1;
 107                 break;
 108         }
 109
 110         spin_lock_init(&brd->bd_intr_lock);
 111
 112         /* store which revision we have */
 113         brd->rev = pdev->revision;
 114
 115         brd->irq = pdev->irq;
 116
 117         switch (pdev->device) {
 118         case PCI_DEVICE_ID_CLASSIC_4:
 119         case PCI_DEVICE_ID_CLASSIC_4_422:
 120         case PCI_DEVICE_ID_CLASSIC_8:
 121         case PCI_DEVICE_ID_CLASSIC_8_422:
 122
 123                 jsm_dbg(INIT, &brd->pci_dev,
 124                         "jsm_found_board - Classic adapter\n");
 125
 126                 /*
 127                  * For PCI ClassicBoards
 128                  * PCI Local Address (.i.e. "resource" number) space
 129                  * 0    PLX Memory Mapped Config
 130                  * 1    PLX I/O Mapped Config
 131                  * 2    I/O Mapped UARTs and Status
 132                  * 3    Memory Mapped VPD
 133                  * 4    Memory Mapped UARTs and Status
 134                  */
 135
 136                 /* Get the PCI Base Address Registers */
 137                 brd->membase = pci_resource_start(pdev, 4);
 138                 brd->membase_end = pci_resource_end(pdev, 4);
 139
 140                 if (brd->membase & 0x1)
 141                         brd->membase &= ~0x3;
 142                 else
 143                         brd->membase &= ~0xF;
 144
 145                 brd->iobase = pci_resource_start(pdev, 1);
 146                 brd->iobase_end = pci_resource_end(pdev, 1);
 147                 brd->iobase = ((unsigned int)(brd->iobase)) & 0xFFFE;
 148
 149                 /* Assign the board_ops struct */
 150                 brd->bd_ops = &jsm_cls_ops;
 151
 152                 brd->bd_uart_offset = 0x8;
 153                 brd->bd_dividend = 921600;
 154
 155                 brd->re_map_membase = ioremap(brd->membase,
 156                                                 pci_resource_len(pdev, 4));
 157                 if (!brd->re_map_membase) {
 158                         dev_err(&pdev->dev,
 159                                 "Card has no PCI Memory resources, failing board.\n");
 160                         rc = -ENOMEM;
 161                         goto out_kfree_brd;
 162                 }
 163
 164                 /*
 165                  * Enable Local Interrupt 1                     (0x1),
 166                  * Local Interrupt 1 Polarity Active high       (0x2),
 167                  * Enable PCI interrupt                         (0x43)
 168                  */
 169                 outb(0x43, brd->iobase + 0x4c);
 170
 171                 break;
 172
 173         case PCI_DEVICE_ID_NEO_2DB9:
 174         case PCI_DEVICE_ID_NEO_2DB9PRI:
 175         case PCI_DEVICE_ID_NEO_2RJ45:
 176         case PCI_DEVICE_ID_NEO_2RJ45PRI:
 177         case PCI_DEVICE_ID_NEO_2_422_485:
 178         case PCI_DEVICE_ID_NEO_4:
 179         case PCIE_DEVICE_ID_NEO_4:
 180         case PCIE_DEVICE_ID_NEO_4RJ45:
 181         case PCIE_DEVICE_ID_NEO_4_IBM:
 182         case PCI_DEVICE_ID_DIGI_NEO_8:
 183         case PCIE_DEVICE_ID_NEO_8:
 184         case PCIE_DEVICE_ID_NEO_8RJ45:
 185
 186                 jsm_dbg(INIT, &brd->pci_dev, "jsm_found_board - NEO adapter\n");
 187
 188                 /* get the PCI Base Address Registers */
 189                 brd->membase    = pci_resource_start(pdev, 0);
 190                 brd->membase_end = pci_resource_end(pdev, 0);
 191
 192                 if (brd->membase & 1)
 193                         brd->membase &= ~0x3;
 194                 else
 195                         brd->membase &= ~0xF;
 196
 197                 /* Assign the board_ops struct */
 198                 brd->bd_ops = &jsm_neo_ops;
 199
 200                 brd->bd_uart_offset = 0x200;
 201                 brd->bd_dividend = 921600;
 202
 203                 brd->re_map_membase = ioremap(brd->membase,
 204                                                 pci_resource_len(pdev, 0));
 205                 if (!brd->re_map_membase) {
 206                         dev_err(&pdev->dev,
 207                                 "Card has no PCI Memory resources, failing board.\n");
 208                         rc = -ENOMEM;
 209                         goto out_kfree_brd;
 210                 }
 211
 212                 break;
 213         default:
 214                 rc = -ENXIO;
 215                 goto out_kfree_brd;
 216         }
 217
 218         rc = request_irq(brd->irq, brd->bd_ops->intr, IRQF_SHARED, "JSM", brd);
 219         if (rc) {
 220                 dev_warn(&pdev->dev, "Failed to hook IRQ %d\n", brd->irq);
 221                 goto out_iounmap;
 222         }
 223
 224         rc = jsm_tty_init(brd);
 225         if (rc < 0) {
 226                 dev_err(&pdev->dev, "Can't init tty devices (%d)\n", rc);
 227                 rc = -ENXIO;
 228                 goto out_free_irq;
 229         }
 230
 231         rc = jsm_uart_port_init(brd);
 232         if (rc < 0) {
 233                 /* XXX: leaking all resources from jsm_tty_init here! */
 234                 dev_err(&pdev->dev, "Can't init uart port (%d)\n", rc);
 235                 rc = -ENXIO;
 236                 goto out_free_irq;
 237         }
 238
 239         /* Log the information about the board */
 240         dev_info(&pdev->dev, "board %d: Digi Classic/Neo (rev %d), irq %d\n",
 241                         adapter_count, brd->rev, brd->irq);
 242
 243         pci_set_drvdata(pdev, brd);
 244         pci_save_state(pdev);
 245
 246         return 0;
 247  out_free_irq:
 248         jsm_remove_uart_port(brd);
 249         free_irq(brd->irq, brd);
 250  out_iounmap:
 251         iounmap(brd->re_map_membase);
 252  out_kfree_brd:
 253         kfree(brd);
 254  out_release_regions:
 255         pci_release_regions(pdev);
 256  out_disable_device:
 257         pci_disable_device(pdev);
 258  out:
 259         return rc;
 260 }
 261
 262 static void jsm_remove_one(struct pci_dev *pdev)
 263 {
 264         struct jsm_board *brd = pci_get_drvdata(pdev);
 265         int i = 0;
 266
 267         switch (pdev->device) {
 268         case PCI_DEVICE_ID_CLASSIC_4:
 269         case PCI_DEVICE_ID_CLASSIC_4_422:
 270         case PCI_DEVICE_ID_CLASSIC_8:
 271         case PCI_DEVICE_ID_CLASSIC_8_422:
 272                 /* Tell card not to interrupt anymore. */
 273                 outb(0x0, brd->iobase + 0x4c);
 274                 break;
 275         default:
 276                 break;
 277         }
 278
 279         jsm_remove_uart_port(brd);
 280
 281         free_irq(brd->irq, brd);
 282         iounmap(brd->re_map_membase);
 283
 284         /* Free all allocated channels structs */
 285         for (i = 0; i < brd->maxports; i++) {
 286                 if (brd->channels[i]) {
 287                         kfree(brd->channels[i]->ch_rqueue);
 288                         kfree(brd->channels[i]->ch_equeue);
 289                         kfree(brd->channels[i]);
 290                 }
 291         }
 292
 293         pci_release_regions(pdev);
 294         pci_disable_device(pdev);
 295         kfree(brd);
 296 }
 297
 298 static const struct pci_device_id jsm_pci_tbl[] = {
 299         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9), 0, 0, 0 },
 300         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9PRI), 0, 0, 1 },
 301         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45), 0, 0, 2 },
 302         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45PRI), 0, 0, 3 },
 303         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_4_IBM), 0, 0, 4 },
 304         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_DIGI_NEO_8), 0, 0, 5 },
 305         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_4), 0, 0, 6 },
 306         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_1_422), 0, 0, 7 },
 307         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_1_422_485), 0, 0, 8 },
 308         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2_422_485), 0, 0, 9 },
 309         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_8), 0, 0, 10 },
 310         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_4), 0, 0, 11 },
 311         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_4RJ45), 0, 0, 12 },
 312         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_8RJ45), 0, 0, 13 },
 313         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_CLASSIC_4), 0, 0, 14 },
 314         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_CLASSIC_4_422), 0, 0, 15 },
 315         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_CLASSIC_8), 0, 0, 16 },
 316         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_CLASSIC_8_422), 0, 0, 17 },
 317         { 0, }
 318 };
 319 MODULE_DEVICE_TABLE(pci, jsm_pci_tbl);
 320
 321 static struct pci_driver jsm_driver = {
 322         .name           = JSM_DRIVER_NAME,
 323         .id_table       = jsm_pci_tbl,
 324         .probe          = jsm_probe_one,
 325         .remove         = jsm_remove_one,
 326         .err_handler    = &jsm_err_handler,
 327 };
 328
 329 static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
 330                                         pci_channel_state_t state)
 331 {
 332         struct jsm_board *brd = pci_get_drvdata(pdev);
 333
 334         jsm_remove_uart_port(brd);
 335
 336         return PCI_ERS_RESULT_NEED_RESET;
 337 }
 338
 339 static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev)
 340 {
 341         int rc;
 342
 343         rc = pci_enable_device(pdev);
 344
 345         if (rc)
 346                 return PCI_ERS_RESULT_DISCONNECT;
 347
 348         pci_set_master(pdev);
 349
 350         return PCI_ERS_RESULT_RECOVERED;
 351 }
 352
 353 static void jsm_io_resume(struct pci_dev *pdev)
 354 {
 355         struct jsm_board *brd = pci_get_drvdata(pdev);
 356
 357         pci_restore_state(pdev);
 358         pci_save_state(pdev);
 359
 360         jsm_uart_port_init(brd);
 361 }
 362
 363 static int __init jsm_init_module(void)
 364 {
 365         int rc;
 366
 367         rc = uart_register_driver(&jsm_uart_driver);
 368         if (!rc) {
 369                 rc = pci_register_driver(&jsm_driver);
 370                 if (rc)
 371                         uart_unregister_driver(&jsm_uart_driver);
 372         }
 373         return rc;
 374 }
 375
 376 static void __exit jsm_exit_module(void)
 377 {
 378         pci_unregister_driver(&jsm_driver);
 379         uart_unregister_driver(&jsm_uart_driver);
 380 }
 381
 382 module_init(jsm_init_module);
 383 module_exit(jsm_exit_module);