drivers/media/pci/ddbridge/ddbridge-main.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ddbridge.c: Digital Devices PCIe bridge driver
   4  *
   5  * Copyright (C) 2010-2017 Digital Devices GmbH
   6  *                         Ralph Metzler <rjkm@metzlerbros.de>
   7  *                         Marcus Metzler <mocm@metzlerbros.de>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 only, as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/delay.h>
  25 #include <linux/slab.h>
  26 #include <linux/poll.h>
  27 #include <linux/io.h>
  28 #include <linux/pci.h>
  29 #include <linux/pci_ids.h>
  30 #include <linux/timer.h>
  31 #include <linux/i2c.h>
  32 #include <linux/swab.h>
  33 #include <linux/vmalloc.h>
  34
  35 #include "ddbridge.h"
  36 #include "ddbridge-i2c.h"
  37 #include "ddbridge-regs.h"
  38 #include "ddbridge-hw.h"
  39 #include "ddbridge-io.h"
  40
  41 /****************************************************************************/
  42 /* module parameters */
  43
  44 #ifdef CONFIG_PCI_MSI
  45 #ifdef CONFIG_DVB_DDBRIDGE_MSIENABLE
  46 static int msi = 1;
  47 #else
  48 static int msi;
  49 #endif
  50 module_param(msi, int, 0444);
  51 #ifdef CONFIG_DVB_DDBRIDGE_MSIENABLE
  52 MODULE_PARM_DESC(msi, "Control MSI interrupts: 0-disable, 1-enable (default)");
  53 #else
  54 MODULE_PARM_DESC(msi, "Control MSI interrupts: 0-disable (default), 1-enable");
  55 #endif
  56 #endif
  57
  58 /****************************************************************************/
  59 /****************************************************************************/
  60 /****************************************************************************/
  61
  62 static void ddb_irq_disable(struct ddb *dev)
  63 {
  64         ddbwritel(dev, 0, INTERRUPT_ENABLE);
  65         ddbwritel(dev, 0, MSI1_ENABLE);
  66 }
  67
  68 static void ddb_msi_exit(struct ddb *dev)
  69 {
  70 #ifdef CONFIG_PCI_MSI
  71         if (dev->msi)
  72                 pci_free_irq_vectors(dev->pdev);
  73 #endif
  74 }
  75
  76 static void ddb_irq_exit(struct ddb *dev)
  77 {
  78         ddb_irq_disable(dev);
  79         if (dev->msi == 2)
  80                 free_irq(pci_irq_vector(dev->pdev, 1), dev);
  81         free_irq(pci_irq_vector(dev->pdev, 0), dev);
  82 }
  83
  84 static void ddb_remove(struct pci_dev *pdev)
  85 {
  86         struct ddb *dev = (struct ddb *)pci_get_drvdata(pdev);
  87
  88         ddb_device_destroy(dev);
  89         ddb_ports_detach(dev);
  90         ddb_i2c_release(dev);
  91
  92         ddb_irq_exit(dev);
  93         ddb_msi_exit(dev);
  94         ddb_ports_release(dev);
  95         ddb_buffers_free(dev);
  96
  97         ddb_unmap(dev);
  98         pci_set_drvdata(pdev, NULL);
  99         pci_disable_device(pdev);
 100 }
 101
 102 #ifdef CONFIG_PCI_MSI
 103 static void ddb_irq_msi(struct ddb *dev, int nr)
 104 {
 105         int stat;
 106
 107         if (msi && pci_msi_enabled()) {
 108                 stat = pci_alloc_irq_vectors(dev->pdev, 1, nr,
 109                                              PCI_IRQ_MSI | PCI_IRQ_MSIX);
 110                 if (stat >= 1) {
 111                         dev->msi = stat;
 112                         dev_info(dev->dev, "using %d MSI interrupt(s)\n",
 113                                  dev->msi);
 114                 } else {
 115                         dev_info(dev->dev, "MSI not available.\n");
 116                 }
 117         }
 118 }
 119 #endif
 120
 121 static int ddb_irq_init(struct ddb *dev)
 122 {
 123         int stat;
 124         int irq_flag = IRQF_SHARED;
 125
 126         ddbwritel(dev, 0x00000000, INTERRUPT_ENABLE);
 127         ddbwritel(dev, 0x00000000, MSI1_ENABLE);
 128         ddbwritel(dev, 0x00000000, MSI2_ENABLE);
 129         ddbwritel(dev, 0x00000000, MSI3_ENABLE);
 130         ddbwritel(dev, 0x00000000, MSI4_ENABLE);
 131         ddbwritel(dev, 0x00000000, MSI5_ENABLE);
 132         ddbwritel(dev, 0x00000000, MSI6_ENABLE);
 133         ddbwritel(dev, 0x00000000, MSI7_ENABLE);
 134
 135 #ifdef CONFIG_PCI_MSI
 136         ddb_irq_msi(dev, 2);
 137
 138         if (dev->msi)
 139                 irq_flag = 0;
 140         if (dev->msi == 2) {
 141                 stat = request_irq(pci_irq_vector(dev->pdev, 0),
 142                                    ddb_irq_handler0, irq_flag, "ddbridge",
 143                                    (void *)dev);
 144                 if (stat < 0)
 145                         return stat;
 146                 stat = request_irq(pci_irq_vector(dev->pdev, 1),
 147                                    ddb_irq_handler1, irq_flag, "ddbridge",
 148                                    (void *)dev);
 149                 if (stat < 0) {
 150                         free_irq(pci_irq_vector(dev->pdev, 0), dev);
 151                         return stat;
 152                 }
 153         } else
 154 #endif
 155         {
 156                 stat = request_irq(pci_irq_vector(dev->pdev, 0),
 157                                    ddb_irq_handler, irq_flag, "ddbridge",
 158                                    (void *)dev);
 159                 if (stat < 0)
 160                         return stat;
 161         }
 162         if (dev->msi == 2) {
 163                 ddbwritel(dev, 0x0fffff00, INTERRUPT_ENABLE);
 164                 ddbwritel(dev, 0x0000000f, MSI1_ENABLE);
 165         } else {
 166                 ddbwritel(dev, 0x0fffff0f, INTERRUPT_ENABLE);
 167                 ddbwritel(dev, 0x00000000, MSI1_ENABLE);
 168         }
 169         return stat;
 170 }
 171
 172 static int ddb_probe(struct pci_dev *pdev,
 173                      const struct pci_device_id *id)
 174 {
 175         struct ddb *dev;
 176         int stat = 0;
 177
 178         if (pci_enable_device(pdev) < 0)
 179                 return -ENODEV;
 180
 181         pci_set_master(pdev);
 182
 183         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
 184                 if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)))
 185                         return -ENODEV;
 186
 187         dev = vzalloc(sizeof(*dev));
 188         if (!dev)
 189                 return -ENOMEM;
 190
 191         mutex_init(&dev->mutex);
 192         dev->has_dma = 1;
 193         dev->pdev = pdev;
 194         dev->dev = &pdev->dev;
 195         pci_set_drvdata(pdev, dev);
 196
 197         dev->link[0].ids.vendor = id->vendor;
 198         dev->link[0].ids.device = id->device;
 199         dev->link[0].ids.subvendor = id->subvendor;
 200         dev->link[0].ids.subdevice = pdev->subsystem_device;
 201         dev->link[0].ids.devid = (id->device << 16) | id->vendor;
 202
 203         dev->link[0].dev = dev;
 204         dev->link[0].info = get_ddb_info(id->vendor, id->device,
 205                                          id->subvendor, pdev->subsystem_device);
 206
 207         dev_info(&pdev->dev, "detected %s\n", dev->link[0].info->name);
 208
 209         dev->regs_len = pci_resource_len(dev->pdev, 0);
 210         dev->regs = ioremap(pci_resource_start(dev->pdev, 0),
 211                             pci_resource_len(dev->pdev, 0));
 212
 213         if (!dev->regs) {
 214                 dev_err(&pdev->dev, "not enough memory for register map\n");
 215                 stat = -ENOMEM;
 216                 goto fail;
 217         }
 218         if (ddbreadl(dev, 0) == 0xffffffff) {
 219                 dev_err(&pdev->dev, "cannot read registers\n");
 220                 stat = -ENODEV;
 221                 goto fail;
 222         }
 223
 224         dev->link[0].ids.hwid = ddbreadl(dev, 0);
 225         dev->link[0].ids.regmapid = ddbreadl(dev, 4);
 226
 227         dev_info(&pdev->dev, "HW %08x REGMAP %08x\n",
 228                  dev->link[0].ids.hwid, dev->link[0].ids.regmapid);
 229
 230         ddbwritel(dev, 0, DMA_BASE_READ);
 231         ddbwritel(dev, 0, DMA_BASE_WRITE);
 232
 233         stat = ddb_irq_init(dev);
 234         if (stat < 0)
 235                 goto fail0;
 236
 237         if (ddb_init(dev) == 0)
 238                 return 0;
 239
 240         ddb_irq_exit(dev);
 241 fail0:
 242         dev_err(&pdev->dev, "fail0\n");
 243         ddb_msi_exit(dev);
 244 fail:
 245         dev_err(&pdev->dev, "fail\n");
 246
 247         ddb_unmap(dev);
 248         pci_set_drvdata(pdev, NULL);
 249         pci_disable_device(pdev);
 250         return -1;
 251 }
 252
 253 /****************************************************************************/
 254 /****************************************************************************/
 255 /****************************************************************************/
 256
 257 #define DDB_DEVICE_ANY(_device) \
 258                 { PCI_DEVICE_SUB(DDVID, _device, DDVID, PCI_ANY_ID) }
 259
 260 static const struct pci_device_id ddb_id_table[] = {
 261         DDB_DEVICE_ANY(0x0002),
 262         DDB_DEVICE_ANY(0x0003),
 263         DDB_DEVICE_ANY(0x0005),
 264         DDB_DEVICE_ANY(0x0006),
 265         DDB_DEVICE_ANY(0x0007),
 266         DDB_DEVICE_ANY(0x0008),
 267         DDB_DEVICE_ANY(0x0009),
 268         DDB_DEVICE_ANY(0x0011),
 269         DDB_DEVICE_ANY(0x0012),
 270         DDB_DEVICE_ANY(0x0013),
 271         DDB_DEVICE_ANY(0x0201),
 272         DDB_DEVICE_ANY(0x0203),
 273         DDB_DEVICE_ANY(0x0210),
 274         DDB_DEVICE_ANY(0x0220),
 275         DDB_DEVICE_ANY(0x0320),
 276         DDB_DEVICE_ANY(0x0321),
 277         DDB_DEVICE_ANY(0x0322),
 278         DDB_DEVICE_ANY(0x0323),
 279         DDB_DEVICE_ANY(0x0328),
 280         DDB_DEVICE_ANY(0x0329),
 281         {0}
 282 };
 283
 284 MODULE_DEVICE_TABLE(pci, ddb_id_table);
 285
 286 static struct pci_driver ddb_pci_driver = {
 287         .name        = "ddbridge",
 288         .id_table    = ddb_id_table,
 289         .probe       = ddb_probe,
 290         .remove      = ddb_remove,
 291 };
 292
 293 static __init int module_init_ddbridge(void)
 294 {
 295         int stat;
 296
 297         pr_info("Digital Devices PCIE bridge driver "
 298                 DDBRIDGE_VERSION
 299                 ", Copyright (C) 2010-17 Digital Devices GmbH\n");
 300         stat = ddb_init_ddbridge();
 301         if (stat < 0)
 302                 return stat;
 303         stat = pci_register_driver(&ddb_pci_driver);
 304         if (stat < 0)
 305                 ddb_exit_ddbridge(0, stat);
 306
 307         return stat;
 308 }
 309
 310 static __exit void module_exit_ddbridge(void)
 311 {
 312         pci_unregister_driver(&ddb_pci_driver);
 313         ddb_exit_ddbridge(0, 0);
 314 }
 315
 316 module_init(module_init_ddbridge);
 317 module_exit(module_exit_ddbridge);
 318
 319 MODULE_DESCRIPTION("Digital Devices PCIe Bridge");
 320 MODULE_AUTHOR("Ralph and Marcus Metzler, Metzler Brothers Systementwicklung GbR");
 321 MODULE_LICENSE("GPL v2");
 322 MODULE_VERSION(DDBRIDGE_VERSION);