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 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         pci_set_drvdata(pdev, brd);
 164         pci_save_state(pdev);
 165
 166         return 0;
 167  out_free_irq:
 168         jsm_remove_uart_port(brd);
 169         free_irq(brd->irq, brd);
 170  out_iounmap:
 171         iounmap(brd->re_map_membase);
 172  out_kfree_brd:
 173         kfree(brd);
 174  out_release_regions:
 175         pci_release_regions(pdev);
 176  out_disable_device:
 177         pci_disable_device(pdev);
 178  out:
 179         return rc;
 180 }
 181
 182 static void __devexit jsm_remove_one(struct pci_dev *pdev)
 183 {
 184         struct jsm_board *brd = pci_get_drvdata(pdev);
 185         int i = 0;
 186
 187         jsm_remove_uart_port(brd);
 188
 189         free_irq(brd->irq, brd);
 190         iounmap(brd->re_map_membase);
 191
 192         /* Free all allocated channels structs */
 193         for (i = 0; i < brd->maxports; i++) {
 194                 if (brd->channels[i]) {
 195                         kfree(brd->channels[i]->ch_rqueue);
 196                         kfree(brd->channels[i]->ch_equeue);
 197                         kfree(brd->channels[i]);
 198                 }
 199         }
 200
 201         pci_release_regions(pdev);
 202         pci_disable_device(pdev);
 203         kfree(brd);
 204 }
 205
 206 static struct pci_device_id jsm_pci_tbl[] = {
 207         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9), 0, 0, 0 },
 208         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9PRI), 0, 0, 1 },
 209         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45), 0, 0, 2 },
 210         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45PRI), 0, 0, 3 },
 211         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_4_IBM), 0, 0, 4 },
 212         { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_DIGI_NEO_8), 0, 0, 5 },
 213         { 0, }
 214 };
 215 MODULE_DEVICE_TABLE(pci, jsm_pci_tbl);
 216
 217 static struct pci_driver jsm_driver = {
 218         .name           = "jsm",
 219         .id_table       = jsm_pci_tbl,
 220         .probe          = jsm_probe_one,
 221         .remove         = __devexit_p(jsm_remove_one),
 222         .err_handler    = &jsm_err_handler,
 223 };
 224
 225 static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
 226                                         pci_channel_state_t state)
 227 {
 228         struct jsm_board *brd = pci_get_drvdata(pdev);
 229
 230         jsm_remove_uart_port(brd);
 231
 232         return PCI_ERS_RESULT_NEED_RESET;
 233 }
 234
 235 static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev)
 236 {
 237         int rc;
 238
 239         rc = pci_enable_device(pdev);
 240
 241         if (rc)
 242                 return PCI_ERS_RESULT_DISCONNECT;
 243
 244         pci_set_master(pdev);
 245
 246         return PCI_ERS_RESULT_RECOVERED;
 247 }
 248
 249 static void jsm_io_resume(struct pci_dev *pdev)
 250 {
 251         struct jsm_board *brd = pci_get_drvdata(pdev);
 252
 253         pci_restore_state(pdev);
 254         pci_save_state(pdev);
 255
 256         jsm_uart_port_init(brd);
 257 }
 258
 259 static int __init jsm_init_module(void)
 260 {
 261         int rc;
 262
 263         rc = uart_register_driver(&jsm_uart_driver);
 264         if (!rc) {
 265                 rc = pci_register_driver(&jsm_driver);
 266                 if (rc)
 267                         uart_unregister_driver(&jsm_uart_driver);
 268         }
 269         return rc;
 270 }
 271
 272 static void __exit jsm_exit_module(void)
 273 {
 274         pci_unregister_driver(&jsm_driver);
 275         uart_unregister_driver(&jsm_uart_driver);
 276 }
 277
 278 module_init(jsm_init_module);
 279 module_exit(jsm_exit_module);