drivers/tty/serial/jsm/jsm_driver.c

   1 /************************************************************************
   2  * Copyright 2003 Digi International (www.digi.com)
   3  *
   4  * Copyright (C) 2004 IBM Corporation. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
  13  * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  14  * PURPOSE.  See the GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 * Temple Place - Suite 330, Boston,
  19  * MA  02111-1307, USA.
  20  *
  21  * Contact Information:
  22  * Scott H Kilau <Scott_Kilau@digi.com>
  23  * Wendy Xiong   <wendyx@us.ibm.com>
  24  *
  25  *
  26  ***********************************************************************/
  27 #include <linux/module.h>
  28 #include <linux/pci.h>
  29 #include <linux/slab.h>
  30
  31 #include "jsm.h"
  32
  33 MODULE_AUTHOR("Digi International, http://www.digi.com");
  34 MODULE_DESCRIPTION("Driver for the Digi International "
  35                    "Neo PCI based product line");
  36 MODULE_LICENSE("GPL");
  37 MODULE_SUPPORTED_DEVICE("jsm");
  38
  39 #define JSM_DRIVER_NAME "jsm"
  40 #define NR_PORTS        32
  41 #define JSM_MINOR_START 0
  42
  43 struct uart_driver jsm_uart_driver = {
  44         .owner          = THIS_MODULE,
  45         .driver_name    = JSM_DRIVER_NAME,
  46         .dev_name       = "ttyn",
  47         .major          = 0,
  48         .minor          = JSM_MINOR_START,
  49         .nr             = NR_PORTS,
  50 };
  51
  52 static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
  53                                        pci_channel_state_t state);
  54 static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev);
  55 static void jsm_io_resume(struct pci_dev *pdev);
  56
  57 static const struct pci_error_handlers jsm_err_handler = {
  58         .error_detected = jsm_io_error_detected,
  59         .slot_reset = jsm_io_slot_reset,
  60         .resume = jsm_io_resume,
  61 };
  62
  63 int jsm_debug;
  64 module_param(jsm_debug, int, 0);
  65 MODULE_PARM_DESC(jsm_debug, "Driver debugging level");
  66
  67 static int jsm_probe_one(struct pci_dev *pdev, const struct pci_device_id *ent)
  68 {
  69         int rc = 0;
  70         struct jsm_board *brd;
  71         static int adapter_count = 0;
  72
  73         rc = pci_enable_device(pdev);
  74         if (rc) {
  75                 dev_err(&pdev->dev, "Device enable FAILED\n");
  76                 goto out;
  77         }
  78
  79         rc = pci_request_regions(pdev, "jsm");
  80         if (rc) {
  81                 dev_err(&pdev->dev, "pci_request_region FAILED\n");
  82                 goto out_disable_device;
  83         }
  84
  85         brd = kzalloc(sizeof(struct jsm_board), GFP_KERNEL);
  86         if (!brd) {
  87                 dev_err(&pdev->dev,
  88                         "memory allocation for board structure failed\n");
  89                 rc = -ENOMEM;
  90                 goto out_release_regions;
  91         }
  92
  93         /* store the info for the board we've found */
  94         brd->boardnum = adapter_count++;
  95         brd->pci_dev = pdev;
  96         if (pdev->device == PCIE_DEVICE_ID_NEO_4_IBM)
  97                 brd->maxports = 4;
  98         else if (pdev->device == PCI_DEVICE_ID_DIGI_NEO_8)
  99                 brd->maxports = 8;
 100         else
 101                 brd->maxports = 2;
 102
 103         spin_lock_init(&brd->bd_intr_lock);
 104
 105         /* store which revision we have */
 106         brd->rev = pdev->revision;
 107
 108         brd->irq = pdev->irq;
 109
 110         jsm_dbg(INIT, &brd->pci_dev, "jsm_found_board - NEO adapter\n");
 111
 112         /* get the PCI Base Address Registers */
 113         brd->membase    = pci_resource_start(pdev, 0);
 114         brd->membase_end = pci_resource_end(pdev, 0);
 115
 116         if (brd->membase & 1)
 117                 brd->membase &= ~3;
 118         else
 119                 brd->membase &= ~15;
 120
 121         /* Assign the board_ops struct */
 122         brd->bd_ops = &jsm_neo_ops;
 123
 124         brd->bd_uart_offset = 0x200;
 125         brd->bd_dividend = 921600;
 126
 127         brd->re_map_membase = ioremap(brd->membase, pci_resource_len(pdev, 0));
 128         if (!brd->re_map_membase) {
 129                 dev_err(&pdev->dev,
 130                         "card has no PCI Memory resources, "
 131                         "failing board.\n");
 132                 rc = -ENOMEM;
 133                 goto out_kfree_brd;
 134         }
 135
 136         rc = request_irq(brd->irq, brd->bd_ops->intr,
 137                         IRQF_SHARED, "JSM", brd);
 138         if (rc) {
 139                 printk(KERN_WARNING "Failed to hook IRQ %d\n",brd->irq);
 140                 goto out_iounmap;
 141         }
 142
 143         rc = jsm_tty_init(brd);
 144         if (rc < 0) {
 145                 dev_err(&pdev->dev, "Can't init tty devices (%d)\n", rc);
 146                 rc = -ENXIO;
 147                 goto out_free_irq;
 148         }
 149
 150         rc = jsm_uart_port_init(brd);
 151         if (rc < 0) {
 152                 /* XXX: leaking all resources from jsm_tty_init here! */
 153                 dev_err(&pdev->dev, "Can't init uart port (%d)\n", rc);
 154                 rc = -ENXIO;
 155                 goto out_free_irq;
 156         }
 157
 158         /* Log the information about the board */
 159         dev_info(&pdev->dev, "board %d: Digi Neo (rev %d), irq %d\n",
 160                         adapter_count, brd->rev, brd->irq);
 161
 162         pci_set_drvdata(pdev, brd);
 163         pci_save_state(pdev);
 164
 165         return 0;
 166  out_free_irq:
 167         jsm_remove_uart_port(brd);
 168         free_irq(brd->irq, brd);
 169  out_iounmap:
 170         iounmap(brd->re_map_membase);
 171  out_kfree_brd:
 172         kfree(brd);
 173  out_release_regions:
 174         pci_release_regions(pdev);
 175  out_disable_device:
 176         pci_disable_device(pdev);
 177  out:
 178         return rc;
 179 }
 180
 181 static void jsm_remove_one(struct pci_dev *pdev)
 182 {
 183         struct jsm_board *brd = pci_get_drvdata(pdev);
 184         int i = 0;
 185
 186         jsm_remove_uart_port(brd);
 187
 188         free_irq(brd->irq, brd);
 189         iounmap(brd->re_map_membase);
 190
 191         /* Free all allocated channels structs */
 192         for (i = 0; i < brd->maxports; i++) {
 193                 if (brd->channels[i]) {
 194                         kfree(brd->channels[i]->ch_rqueue);
 195                         kfree(brd->channels[i]->ch_equeue);
 196                         kfree(brd->channels[i]);
 197                 }
 198         }
 199
 200         pci_release_regions(pdev);
 201         pci_disable_device(pdev);
 202         kfree(brd);
 203 }
 204
 205 static struct pci_device_id jsm_pci_tbl[] = {
 206         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9), 0, 0, 0 },
 207         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9PRI), 0, 0, 1 },
 208         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45), 0, 0, 2 },
 209         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45PRI), 0, 0, 3 },
 210         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_4_IBM), 0, 0, 4 },
 211         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_DIGI_NEO_8), 0, 0, 5 },
 212         { 0, }
 213 };
 214 MODULE_DEVICE_TABLE(pci, jsm_pci_tbl);
 215
 216 static struct pci_driver jsm_driver = {
 217         .name           = "jsm",
 218         .id_table       = jsm_pci_tbl,
 219         .probe          = jsm_probe_one,
 220         .remove         = jsm_remove_one,
 221         .err_handler    = &jsm_err_handler,
 222 };
 223
 224 static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
 225                                         pci_channel_state_t state)
 226 {
 227         struct jsm_board *brd = pci_get_drvdata(pdev);
 228
 229         jsm_remove_uart_port(brd);
 230
 231         return PCI_ERS_RESULT_NEED_RESET;
 232 }
 233
 234 static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev)
 235 {
 236         int rc;
 237
 238         rc = pci_enable_device(pdev);
 239
 240         if (rc)
 241                 return PCI_ERS_RESULT_DISCONNECT;
 242
 243         pci_set_master(pdev);
 244
 245         return PCI_ERS_RESULT_RECOVERED;
 246 }
 247
 248 static void jsm_io_resume(struct pci_dev *pdev)
 249 {
 250         struct jsm_board *brd = pci_get_drvdata(pdev);
 251
 252         pci_restore_state(pdev);
 253         pci_save_state(pdev);
 254
 255         jsm_uart_port_init(brd);
 256 }
 257
 258 static int __init jsm_init_module(void)
 259 {
 260         int rc;
 261
 262         rc = uart_register_driver(&jsm_uart_driver);
 263         if (!rc) {
 264                 rc = pci_register_driver(&jsm_driver);
 265                 if (rc)
 266                         uart_unregister_driver(&jsm_uart_driver);
 267         }
 268         return rc;
 269 }
 270
 271 static void __exit jsm_exit_module(void)
 272 {
 273         pci_unregister_driver(&jsm_driver);
 274         uart_unregister_driver(&jsm_uart_driver);
 275 }
 276
 277 module_init(jsm_init_module);
 278 module_exit(jsm_exit_module);