drivers/staging/media/tw686x-kh/tw686x-kh-core.c

   1 /*
   2  * Copyright (C) 2015 Industrial Research Institute for Automation
   3  * and Measurements PIAP
   4  *
   5  * Written by Krzysztof Ha?asa.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License
   9  * as published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include "tw686x-kh.h"
  18 #include "tw686x-kh-regs.h"
  19
  20 static irqreturn_t tw686x_irq(int irq, void *dev_id)
  21 {
  22         struct tw686x_dev *dev = (struct tw686x_dev *)dev_id;
  23         u32 int_status = reg_read(dev, INT_STATUS); /* cleared on read */
  24         unsigned long flags;
  25         unsigned int handled = 0;
  26
  27         if (int_status) {
  28                 spin_lock_irqsave(&dev->irq_lock, flags);
  29                 dev->dma_requests |= int_status;
  30                 spin_unlock_irqrestore(&dev->irq_lock, flags);
  31
  32                 if (int_status & 0xFF0000FF)
  33                         handled = tw686x_kh_video_irq(dev);
  34         }
  35
  36         return IRQ_RETVAL(handled);
  37 }
  38
  39 static int tw686x_probe(struct pci_dev *pci_dev,
  40                         const struct pci_device_id *pci_id)
  41 {
  42         struct tw686x_dev *dev;
  43         int err;
  44
  45         dev = devm_kzalloc(&pci_dev->dev, sizeof(*dev) +
  46                            (pci_id->driver_data & TYPE_MAX_CHANNELS) *
  47                            sizeof(dev->video_channels[0]), GFP_KERNEL);
  48         if (!dev)
  49                 return -ENOMEM;
  50
  51         sprintf(dev->name, "TW%04X", pci_dev->device);
  52         dev->type = pci_id->driver_data;
  53
  54         pr_info("%s: PCI %s, IRQ %d, MMIO 0x%lx\n", dev->name,
  55                 pci_name(pci_dev), pci_dev->irq,
  56                 (unsigned long)pci_resource_start(pci_dev, 0));
  57
  58         dev->pci_dev = pci_dev;
  59         if (pcim_enable_device(pci_dev))
  60                 return -EIO;
  61
  62         pci_set_master(pci_dev);
  63
  64         if (pci_set_dma_mask(pci_dev, DMA_BIT_MASK(32))) {
  65                 pr_err("%s: 32-bit PCI DMA not supported\n", dev->name);
  66                 return -EIO;
  67         }
  68
  69         err = pci_request_regions(pci_dev, dev->name);
  70         if (err < 0) {
  71                 pr_err("%s: Unable to get MMIO region\n", dev->name);
  72                 return err;
  73         }
  74
  75         dev->mmio = pci_ioremap_bar(pci_dev, 0);
  76         if (!dev->mmio) {
  77                 pr_err("%s: Unable to remap MMIO region\n", dev->name);
  78                 return -EIO;
  79         }
  80
  81         reg_write(dev, SYS_SOFT_RST, 0x0F); /* Reset all subsystems */
  82         mdelay(1);
  83
  84         reg_write(dev, SRST[0], 0x3F);
  85         if (max_channels(dev) > 4)
  86                 reg_write(dev, SRST[1], 0x3F);
  87         reg_write(dev, DMA_CMD, 0);
  88         reg_write(dev, DMA_CHANNEL_ENABLE, 0);
  89         reg_write(dev, DMA_CHANNEL_TIMEOUT, 0x3EFF0FF0);
  90         reg_write(dev, DMA_TIMER_INTERVAL, 0x38000);
  91         reg_write(dev, DMA_CONFIG, 0xFFFFFF04);
  92
  93         spin_lock_init(&dev->irq_lock);
  94
  95         err = devm_request_irq(&pci_dev->dev, pci_dev->irq, tw686x_irq,
  96                                IRQF_SHARED, dev->name, dev);
  97         if (err < 0) {
  98                 pr_err("%s: Unable to get IRQ\n", dev->name);
  99                 return err;
 100         }
 101
 102         err = tw686x_kh_video_init(dev);
 103         if (err)
 104                 return err;
 105
 106         pci_set_drvdata(pci_dev, dev);
 107         return 0;
 108 }
 109
 110 static void tw686x_remove(struct pci_dev *pci_dev)
 111 {
 112         struct tw686x_dev *dev = pci_get_drvdata(pci_dev);
 113
 114         tw686x_kh_video_free(dev);
 115 }
 116
 117 /* driver_data is number of A/V channels */
 118 static const struct pci_device_id tw686x_pci_tbl[] = {
 119         {PCI_DEVICE(0x1797, 0x6864), .driver_data = 4},
 120         /* not tested */
 121         {PCI_DEVICE(0x1797, 0x6865), .driver_data = 4 | TYPE_SECOND_GEN},
 122         /* TW6868 supports 8 A/V channels with an external TW2865 chip -
 123            not supported by the driver */
 124         {PCI_DEVICE(0x1797, 0x6868), .driver_data = 4}, /* not tested */
 125         {PCI_DEVICE(0x1797, 0x6869), .driver_data = 8 | TYPE_SECOND_GEN},
 126         {}
 127 };
 128
 129 static struct pci_driver tw686x_pci_driver = {
 130         .name = "tw686x-kh",
 131         .id_table = tw686x_pci_tbl,
 132         .probe = tw686x_probe,
 133         .remove = tw686x_remove,
 134 };
 135
 136 MODULE_DESCRIPTION("Driver for video frame grabber cards based on Intersil/Techwell TW686[4589]");
 137 MODULE_AUTHOR("Krzysztof Halasa");
 138 MODULE_LICENSE("GPL v2");
 139 MODULE_DEVICE_TABLE(pci, tw686x_pci_tbl);
 140 module_pci_driver(tw686x_pci_driver);