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/moduleparam.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 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 __devinit 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_printk(INIT, INFO, &brd->pci_dev,
 111                 "jsm_found_board - NEO adapter\n");
 112
 113         /* get the PCI Base Address Registers */
 114         brd->membase    = pci_resource_start(pdev, 0);
 115         brd->membase_end = pci_resource_end(pdev, 0);
 116
 117         if (brd->membase & 1)
 118                 brd->membase &= ~3;
 119         else
 120                 brd->membase &= ~15;
 121
 122         /* Assign the board_ops struct */
 123         brd->bd_ops = &jsm_neo_ops;
 124
 125         brd->bd_uart_offset = 0x200;
 126         brd->bd_dividend = 921600;
 127
 128         brd->re_map_membase = ioremap(brd->membase, pci_resource_len(pdev, 0));
 129         if (!brd->re_map_membase) {
 130                 dev_err(&pdev->dev,
 131                         "card has no PCI Memory resources, "
 132                         "failing board.\n");
 133                 rc = -ENOMEM;
 134                 goto out_kfree_brd;
 135         }
 136
 137         rc = request_irq(brd->irq, brd->bd_ops->intr,
 138                         IRQF_SHARED, "JSM", brd);
 139         if (rc) {
 140                 printk(KERN_WARNING "Failed to hook IRQ %d\n",brd->irq);
 141                 goto out_iounmap;
 142         }
 143
 144         rc = jsm_tty_init(brd);
 145         if (rc < 0) {
 146                 dev_err(&pdev->dev, "Can't init tty devices (%d)\n", rc);
 147                 rc = -ENXIO;
 148                 goto out_free_irq;
 149         }
 150
 151         rc = jsm_uart_port_init(brd);
 152         if (rc < 0) {
 153                 /* XXX: leaking all resources from jsm_tty_init here! */
 154                 dev_err(&pdev->dev, "Can't init uart port (%d)\n", rc);
 155                 rc = -ENXIO;
 156                 goto out_free_irq;
 157         }
 158
 159         /* Log the information about the board */
 160         dev_info(&pdev->dev, "board %d: Digi Neo (rev %d), irq %d\n",
 161                         adapter_count, brd->rev, brd->irq);
 162
 163         /*
 164          * allocate flip buffer for board.
 165          *
 166          * Okay to malloc with GFP_KERNEL, we are not at interrupt
 167          * context, and there are no locks held.
 168          */
 169         brd->flipbuf = kzalloc(MYFLIPLEN, GFP_KERNEL);
 170         if (!brd->flipbuf) {
 171                 /* XXX: leaking all resources from jsm_tty_init and
 172                         jsm_uart_port_init here! */
 173                 dev_err(&pdev->dev, "memory allocation for flipbuf failed\n");
 174                 rc = -ENOMEM;
 175                 goto out_free_uart;
 176         }
 177
 178         pci_set_drvdata(pdev, brd);
 179         pci_save_state(pdev);
 180
 181         return 0;
 182  out_free_uart:
 183         jsm_remove_uart_port(brd);
 184  out_free_irq:
 185         jsm_remove_uart_port(brd);
 186         free_irq(brd->irq, brd);
 187  out_iounmap:
 188         iounmap(brd->re_map_membase);
 189  out_kfree_brd:
 190         kfree(brd);
 191  out_release_regions:
 192         pci_release_regions(pdev);
 193  out_disable_device:
 194         pci_disable_device(pdev);
 195  out:
 196         return rc;
 197 }
 198
 199 static void __devexit jsm_remove_one(struct pci_dev *pdev)
 200 {
 201         struct jsm_board *brd = pci_get_drvdata(pdev);
 202         int i = 0;
 203
 204         jsm_remove_uart_port(brd);
 205
 206         free_irq(brd->irq, brd);
 207         iounmap(brd->re_map_membase);
 208
 209         /* Free all allocated channels structs */
 210         for (i = 0; i < brd->maxports; i++) {
 211                 if (brd->channels[i]) {
 212                         kfree(brd->channels[i]->ch_rqueue);
 213                         kfree(brd->channels[i]->ch_equeue);
 214                         kfree(brd->channels[i]);
 215                 }
 216         }
 217
 218         pci_release_regions(pdev);
 219         pci_disable_device(pdev);
 220         kfree(brd->flipbuf);
 221         kfree(brd);
 222 }
 223
 224 static struct pci_device_id jsm_pci_tbl[] = {
 225         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9), 0, 0, 0 },
 226         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9PRI), 0, 0, 1 },
 227         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45), 0, 0, 2 },
 228         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45PRI), 0, 0, 3 },
 229         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_4_IBM), 0, 0, 4 },
 230         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_DIGI_NEO_8), 0, 0, 5 },
 231         { 0, }
 232 };
 233 MODULE_DEVICE_TABLE(pci, jsm_pci_tbl);
 234
 235 static struct pci_driver jsm_driver = {
 236         .name           = "jsm",
 237         .id_table       = jsm_pci_tbl,
 238         .probe          = jsm_probe_one,
 239         .remove         = __devexit_p(jsm_remove_one),
 240         .err_handler    = &jsm_err_handler,
 241 };
 242
 243 static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
 244                                         pci_channel_state_t state)
 245 {
 246         struct jsm_board *brd = pci_get_drvdata(pdev);
 247
 248         jsm_remove_uart_port(brd);
 249
 250         return PCI_ERS_RESULT_NEED_RESET;
 251 }
 252
 253 static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev)
 254 {
 255         int rc;
 256
 257         rc = pci_enable_device(pdev);
 258
 259         if (rc)
 260                 return PCI_ERS_RESULT_DISCONNECT;
 261
 262         pci_set_master(pdev);
 263
 264         return PCI_ERS_RESULT_RECOVERED;
 265 }
 266
 267 static void jsm_io_resume(struct pci_dev *pdev)
 268 {
 269         struct jsm_board *brd = pci_get_drvdata(pdev);
 270
 271         pci_restore_state(pdev);
 272         pci_save_state(pdev);
 273
 274         jsm_uart_port_init(brd);
 275 }
 276
 277 static int __init jsm_init_module(void)
 278 {
 279         int rc;
 280
 281         rc = uart_register_driver(&jsm_uart_driver);
 282         if (!rc) {
 283                 rc = pci_register_driver(&jsm_driver);
 284                 if (rc)
 285                         uart_unregister_driver(&jsm_uart_driver);
 286         }
 287         return rc;
 288 }
 289
 290 static void __exit jsm_exit_module(void)
 291 {
 292         pci_unregister_driver(&jsm_driver);
 293         uart_unregister_driver(&jsm_uart_driver);
 294 }
 295
 296 module_init(jsm_init_module);
 297 module_exit(jsm_exit_module);