drivers/media/pci/mantis/mantis_pci.c

   1 /*
   2         Mantis PCI bridge driver
   3
   4         Copyright (C) Manu Abraham (abraham.manu@gmail.com)
   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 of the License, or
   9         (at your option) any later version.
  10
  11         This program is distributed in the hope that it will be useful,
  12         but WITHOUT ANY WARRANTY; without even the implied warranty of
  13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14         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., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/kernel.h>
  24 #include <asm/io.h>
  25 #include <asm/page.h>
  26 #include <linux/kmod.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/init.h>
  29 #include <linux/device.h>
  30 #include <linux/pci.h>
  31
  32 #include <asm/irq.h>
  33 #include <linux/signal.h>
  34 #include <linux/sched.h>
  35 #include <linux/interrupt.h>
  36
  37 #include "dmxdev.h"
  38 #include "dvbdev.h"
  39 #include "dvb_demux.h"
  40 #include "dvb_frontend.h"
  41 #include "dvb_net.h"
  42
  43 #include "mantis_common.h"
  44 #include "mantis_reg.h"
  45 #include "mantis_pci.h"
  46
  47 #define DRIVER_NAME             "Mantis Core"
  48
  49 int mantis_pci_init(struct mantis_pci *mantis)
  50 {
  51         u8 latency;
  52         struct mantis_hwconfig *config  = mantis->hwconfig;
  53         struct pci_dev *pdev            = mantis->pdev;
  54         int err, ret = 0;
  55
  56         dprintk(MANTIS_ERROR, 0, "found a %s PCI %s device on (%02x:%02x.%x),\n",
  57                 config->model_name,
  58                 config->dev_type,
  59                 mantis->pdev->bus->number,
  60                 PCI_SLOT(mantis->pdev->devfn),
  61                 PCI_FUNC(mantis->pdev->devfn));
  62
  63         err = pci_enable_device(pdev);
  64         if (err != 0) {
  65                 ret = -ENODEV;
  66                 dprintk(MANTIS_ERROR, 1, "ERROR: PCI enable failed <%i>", err);
  67                 goto fail0;
  68         }
  69
  70         err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
  71         if (err != 0) {
  72                 dprintk(MANTIS_ERROR, 1, "ERROR: Unable to obtain 32 bit DMA <%i>", err);
  73                 ret = -ENOMEM;
  74                 goto fail1;
  75         }
  76
  77         pci_set_master(pdev);
  78
  79         if (!request_mem_region(pci_resource_start(pdev, 0),
  80                                 pci_resource_len(pdev, 0),
  81                                 DRIVER_NAME)) {
  82
  83                 dprintk(MANTIS_ERROR, 1, "ERROR: BAR0 Request failed !");
  84                 ret = -ENODEV;
  85                 goto fail1;
  86         }
  87
  88         mantis->mmio = ioremap(pci_resource_start(pdev, 0),
  89                                pci_resource_len(pdev, 0));
  90
  91         if (!mantis->mmio) {
  92                 dprintk(MANTIS_ERROR, 1, "ERROR: BAR0 remap failed !");
  93                 ret = -ENODEV;
  94                 goto fail2;
  95         }
  96
  97         pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &latency);
  98         mantis->latency = latency;
  99         mantis->revision = pdev->revision;
 100
 101         dprintk(MANTIS_ERROR, 0, "    Mantis Rev %d [%04x:%04x], ",
 102                 mantis->revision,
 103                 mantis->pdev->subsystem_vendor,
 104                 mantis->pdev->subsystem_device);
 105
 106         dprintk(MANTIS_ERROR, 0,
 107                 "irq: %d, latency: %d\n    memory: 0x%lx, mmio: 0x%p\n",
 108                 mantis->pdev->irq,
 109                 mantis->latency,
 110                 mantis->mantis_addr,
 111                 mantis->mmio);
 112
 113         err = request_irq(pdev->irq,
 114                           config->irq_handler,
 115                           IRQF_SHARED,
 116                           DRIVER_NAME,
 117                           mantis);
 118
 119         if (err != 0) {
 120
 121                 dprintk(MANTIS_ERROR, 1, "ERROR: IRQ registration failed ! <%d>", err);
 122                 ret = -ENODEV;
 123                 goto fail3;
 124         }
 125
 126         pci_set_drvdata(pdev, mantis);
 127         return ret;
 128
 129         /* Error conditions */
 130 fail3:
 131         dprintk(MANTIS_ERROR, 1, "ERROR: <%d> I/O unmap", ret);
 132         if (mantis->mmio)
 133                 iounmap(mantis->mmio);
 134
 135 fail2:
 136         dprintk(MANTIS_ERROR, 1, "ERROR: <%d> releasing regions", ret);
 137         release_mem_region(pci_resource_start(pdev, 0),
 138                            pci_resource_len(pdev, 0));
 139
 140 fail1:
 141         dprintk(MANTIS_ERROR, 1, "ERROR: <%d> disabling device", ret);
 142         pci_disable_device(pdev);
 143
 144 fail0:
 145         dprintk(MANTIS_ERROR, 1, "ERROR: <%d> exiting", ret);
 146         pci_set_drvdata(pdev, NULL);
 147         return ret;
 148 }
 149 EXPORT_SYMBOL_GPL(mantis_pci_init);
 150
 151 void mantis_pci_exit(struct mantis_pci *mantis)
 152 {
 153         struct pci_dev *pdev = mantis->pdev;
 154
 155         dprintk(MANTIS_NOTICE, 1, " mem: 0x%p", mantis->mmio);
 156         free_irq(pdev->irq, mantis);
 157         if (mantis->mmio) {
 158                 iounmap(mantis->mmio);
 159                 release_mem_region(pci_resource_start(pdev, 0),
 160                                    pci_resource_len(pdev, 0));
 161         }
 162
 163         pci_disable_device(pdev);
 164         pci_set_drvdata(pdev, NULL);
 165 }
 166 EXPORT_SYMBOL_GPL(mantis_pci_exit);
 167
 168 MODULE_DESCRIPTION("Mantis PCI DTV bridge driver");
 169 MODULE_AUTHOR("Manu Abraham");
 170 MODULE_LICENSE("GPL");