drivers/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/moduleparam.h>
  28 #include <linux/pci.h>
  29
  30 #include "jsm.h"
  31
  32 MODULE_AUTHOR("Digi International, http://www.digi.com");
  33 MODULE_DESCRIPTION("Driver for the Digi International "
  34                    "Neo PCI based product line");
  35 MODULE_LICENSE("GPL");
  36 MODULE_SUPPORTED_DEVICE("jsm");
  37
  38 #define JSM_DRIVER_NAME "jsm"
  39 #define NR_PORTS        32
  40 #define JSM_MINOR_START 0
  41
  42 struct uart_driver jsm_uart_driver = {
  43         .owner          = THIS_MODULE,
  44         .driver_name    = JSM_DRIVER_NAME,
  45         .dev_name       = "ttyn",
  46         .major          = 0,
  47         .minor          = JSM_MINOR_START,
  48         .nr             = NR_PORTS,
  49 };
  50
  51 static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
  52                                        pci_channel_state_t state);
  53 static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev);
  54 static void jsm_io_resume(struct pci_dev *pdev);
  55
  56 static struct pci_error_handlers jsm_err_handler = {
  57         .error_detected = jsm_io_error_detected,
  58         .slot_reset = jsm_io_slot_reset,
  59         .resume = jsm_io_resume,
  60 };
  61
  62 int jsm_debug;
  63 module_param(jsm_debug, int, 0);
  64 MODULE_PARM_DESC(jsm_debug, "Driver debugging level");
  65
  66 static int __devinit jsm_probe_one(struct pci_dev *pdev, const struct pci_device_id *ent)
  67 {
  68         int rc = 0;
  69         struct jsm_board *brd;
  70         static int adapter_count = 0;
  71
  72         rc = pci_enable_device(pdev);
  73         if (rc) {
  74                 dev_err(&pdev->dev, "Device enable FAILED\n");
  75                 goto out;
  76         }
  77
  78         rc = pci_request_regions(pdev, "jsm");
  79         if (rc) {
  80                 dev_err(&pdev->dev, "pci_request_region FAILED\n");
  81                 goto out_disable_device;
  82         }
  83
  84         brd = kzalloc(sizeof(struct jsm_board), GFP_KERNEL);
  85         if (!brd) {
  86                 dev_err(&pdev->dev,
  87                         "memory allocation for board structure failed\n");
  88                 rc = -ENOMEM;
  89                 goto out_release_regions;
  90         }
  91
  92         /* store the info for the board we've found */
  93         brd->boardnum = adapter_count++;
  94         brd->pci_dev = pdev;
  95         if (pdev->device == PCIE_DEVICE_ID_NEO_4_IBM)
  96                 brd->maxports = 4;
  97         else if (pdev->device == PCI_DEVICE_ID_DIGI_NEO_8)
  98                 brd->maxports = 8;
  99         else
 100                 brd->maxports = 2;
 101
 102         spin_lock_init(&brd->bd_intr_lock);
 103
 104         /* store which revision we have */
 105         brd->rev = pdev->revision;
 106
 107         brd->irq = pdev->irq;
 108
 109         jsm_printk(INIT, INFO, &brd->pci_dev,
 110                 "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, 0x1000);
 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         /*
 163          * allocate flip buffer for board.
 164          *
 165          * Okay to malloc with GFP_KERNEL, we are not at interrupt
 166          * context, and there are no locks held.
 167          */
 168         brd->flipbuf = kzalloc(MYFLIPLEN, GFP_KERNEL);
 169         if (!brd->flipbuf) {
 170                 /* XXX: leaking all resources from jsm_tty_init and
 171                         jsm_uart_port_init here! */
 172                 dev_err(&pdev->dev, "memory allocation for flipbuf failed\n");
 173                 rc = -ENOMEM;
 174                 goto out_free_irq;
 175         }
 176
 177         pci_set_drvdata(pdev, brd);
 178         pci_save_state(pdev);
 179
 180         return 0;
 181  out_free_irq:
 182         jsm_remove_uart_port(brd);
 183         free_irq(brd->irq, brd);
 184  out_iounmap:
 185         iounmap(brd->re_map_membase);
 186  out_kfree_brd:
 187         kfree(brd);
 188  out_release_regions:
 189         pci_release_regions(pdev);
 190  out_disable_device:
 191         pci_disable_device(pdev);
 192  out:
 193         return rc;
 194 }
 195
 196 static void __devexit jsm_remove_one(struct pci_dev *pdev)
 197 {
 198         struct jsm_board *brd = pci_get_drvdata(pdev);
 199         int i = 0;
 200
 201         jsm_remove_uart_port(brd);
 202
 203         free_irq(brd->irq, brd);
 204         iounmap(brd->re_map_membase);
 205
 206         /* Free all allocated channels structs */
 207         for (i = 0; i < brd->maxports; i++) {
 208                 if (brd->channels[i]) {
 209                         kfree(brd->channels[i]->ch_rqueue);
 210                         kfree(brd->channels[i]->ch_equeue);
 211                         kfree(brd->channels[i]->ch_wqueue);
 212                         kfree(brd->channels[i]);
 213                 }
 214         }
 215
 216         pci_release_regions(pdev);
 217         pci_disable_device(pdev);
 218         kfree(brd->flipbuf);
 219         kfree(brd);
 220 }
 221
 222 static struct pci_device_id jsm_pci_tbl[] = {
 223         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9), 0, 0, 0 },
 224         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9PRI), 0, 0, 1 },
 225         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45), 0, 0, 2 },
 226         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45PRI), 0, 0, 3 },
 227         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_4_IBM), 0, 0, 4 },
 228         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_DIGI_NEO_8), 0, 0, 5 },
 229         { 0, }
 230 };
 231 MODULE_DEVICE_TABLE(pci, jsm_pci_tbl);
 232
 233 static struct pci_driver jsm_driver = {
 234         .name           = "jsm",
 235         .id_table       = jsm_pci_tbl,
 236         .probe          = jsm_probe_one,
 237         .remove         = __devexit_p(jsm_remove_one),
 238         .err_handler    = &jsm_err_handler,
 239 };
 240
 241 static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
 242                                         pci_channel_state_t state)
 243 {
 244         struct jsm_board *brd = pci_get_drvdata(pdev);
 245
 246         jsm_remove_uart_port(brd);
 247
 248         return PCI_ERS_RESULT_NEED_RESET;
 249 }
 250
 251 static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev)
 252 {
 253         int rc;
 254
 255         rc = pci_enable_device(pdev);
 256
 257         if (rc)
 258                 return PCI_ERS_RESULT_DISCONNECT;
 259
 260         pci_set_master(pdev);
 261
 262         return PCI_ERS_RESULT_RECOVERED;
 263 }
 264
 265 static void jsm_io_resume(struct pci_dev *pdev)
 266 {
 267         struct jsm_board *brd = pci_get_drvdata(pdev);
 268
 269         pci_restore_state(pdev);
 270
 271         jsm_uart_port_init(brd);
 272 }
 273
 274 static int __init jsm_init_module(void)
 275 {
 276         int rc;
 277
 278         rc = uart_register_driver(&jsm_uart_driver);
 279         if (!rc) {
 280                 rc = pci_register_driver(&jsm_driver);
 281                 if (rc)
 282                         uart_unregister_driver(&jsm_uart_driver);
 283         }
 284         return rc;
 285 }
 286
 287 static void __exit jsm_exit_module(void)
 288 {
 289         pci_unregister_driver(&jsm_driver);
 290         uart_unregister_driver(&jsm_uart_driver);
 291 }
 292
 293 module_init(jsm_init_module);
 294 module_exit(jsm_exit_module);