drivers/media/pci/mantis/mantis_pci.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3         Mantis PCI bridge driver
   4
   5         Copyright (C) Manu Abraham (abraham.manu@gmail.com)
   6
   7 */
   8
   9 #include <linux/module.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/kernel.h>
  12 #include <asm/io.h>
  13 #include <asm/page.h>
  14 #include <linux/kmod.h>
  15 #include <linux/vmalloc.h>
  16 #include <linux/init.h>
  17 #include <linux/device.h>
  18 #include <linux/pci.h>
  19
  20 #include <asm/irq.h>
  21 #include <linux/signal.h>
  22 #include <linux/sched.h>
  23 #include <linux/interrupt.h>
  24
  25 #include <media/dmxdev.h>
  26 #include <media/dvbdev.h>
  27 #include <media/dvb_demux.h>
  28 #include <media/dvb_frontend.h>
  29 #include <media/dvb_net.h>
  30
  31 #include "mantis_common.h"
  32 #include "mantis_reg.h"
  33 #include "mantis_pci.h"
  34
  35 #define DRIVER_NAME             "Mantis Core"
  36
  37 int mantis_pci_init(struct mantis_pci *mantis)
  38 {
  39         u8 latency;
  40         struct mantis_hwconfig *config  = mantis->hwconfig;
  41         struct pci_dev *pdev            = mantis->pdev;
  42         int err, ret = 0;
  43
  44         dprintk(MANTIS_ERROR, 0, "found a %s PCI %s device on (%02x:%02x.%x),\n",
  45                 config->model_name,
  46                 config->dev_type,
  47                 mantis->pdev->bus->number,
  48                 PCI_SLOT(mantis->pdev->devfn),
  49                 PCI_FUNC(mantis->pdev->devfn));
  50
  51         err = pci_enable_device(pdev);
  52         if (err != 0) {
  53                 ret = -ENODEV;
  54                 dprintk(MANTIS_ERROR, 1, "ERROR: PCI enable failed <%i>", err);
  55                 goto fail0;
  56         }
  57
  58         err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
  59         if (err != 0) {
  60                 dprintk(MANTIS_ERROR, 1, "ERROR: Unable to obtain 32 bit DMA <%i>", err);
  61                 ret = -ENOMEM;
  62                 goto fail1;
  63         }
  64
  65         pci_set_master(pdev);
  66
  67         if (!request_mem_region(pci_resource_start(pdev, 0),
  68                                 pci_resource_len(pdev, 0),
  69                                 DRIVER_NAME)) {
  70
  71                 dprintk(MANTIS_ERROR, 1, "ERROR: BAR0 Request failed !");
  72                 ret = -ENODEV;
  73                 goto fail1;
  74         }
  75
  76         mantis->mmio = ioremap(pci_resource_start(pdev, 0),
  77                                pci_resource_len(pdev, 0));
  78
  79         if (!mantis->mmio) {
  80                 dprintk(MANTIS_ERROR, 1, "ERROR: BAR0 remap failed !");
  81                 ret = -ENODEV;
  82                 goto fail2;
  83         }
  84
  85         pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &latency);
  86         mantis->latency = latency;
  87         mantis->revision = pdev->revision;
  88
  89         dprintk(MANTIS_ERROR, 0, "    Mantis Rev %d [%04x:%04x], ",
  90                 mantis->revision,
  91                 mantis->pdev->subsystem_vendor,
  92                 mantis->pdev->subsystem_device);
  93
  94         dprintk(MANTIS_ERROR, 0,
  95                 "irq: %d, latency: %d\n    memory: 0x%lx, mmio: 0x%p\n",
  96                 mantis->pdev->irq,
  97                 mantis->latency,
  98                 mantis->mantis_addr,
  99                 mantis->mmio);
 100
 101         err = request_irq(pdev->irq,
 102                           config->irq_handler,
 103                           IRQF_SHARED,
 104                           DRIVER_NAME,
 105                           mantis);
 106
 107         if (err != 0) {
 108
 109                 dprintk(MANTIS_ERROR, 1, "ERROR: IRQ registration failed ! <%d>", err);
 110                 ret = -ENODEV;
 111                 goto fail3;
 112         }
 113
 114         pci_set_drvdata(pdev, mantis);
 115         return ret;
 116
 117         /* Error conditions */
 118 fail3:
 119         dprintk(MANTIS_ERROR, 1, "ERROR: <%d> I/O unmap", ret);
 120         if (mantis->mmio)
 121                 iounmap(mantis->mmio);
 122
 123 fail2:
 124         dprintk(MANTIS_ERROR, 1, "ERROR: <%d> releasing regions", ret);
 125         release_mem_region(pci_resource_start(pdev, 0),
 126                            pci_resource_len(pdev, 0));
 127
 128 fail1:
 129         dprintk(MANTIS_ERROR, 1, "ERROR: <%d> disabling device", ret);
 130         pci_disable_device(pdev);
 131
 132 fail0:
 133         dprintk(MANTIS_ERROR, 1, "ERROR: <%d> exiting", ret);
 134         return ret;
 135 }
 136 EXPORT_SYMBOL_GPL(mantis_pci_init);
 137
 138 void mantis_pci_exit(struct mantis_pci *mantis)
 139 {
 140         struct pci_dev *pdev = mantis->pdev;
 141
 142         dprintk(MANTIS_NOTICE, 1, " mem: 0x%p", mantis->mmio);
 143         free_irq(pdev->irq, mantis);
 144         if (mantis->mmio) {
 145                 iounmap(mantis->mmio);
 146                 release_mem_region(pci_resource_start(pdev, 0),
 147                                    pci_resource_len(pdev, 0));
 148         }
 149
 150         pci_disable_device(pdev);
 151 }
 152 EXPORT_SYMBOL_GPL(mantis_pci_exit);
 153
 154 MODULE_DESCRIPTION("Mantis PCI DTV bridge driver");
 155 MODULE_AUTHOR("Manu Abraham");
 156 MODULE_LICENSE("GPL");