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