drivers/usb/host/isp1760-if.c

   1 /*
   2  * Glue code for the ISP1760 driver and bus
   3  * Currently there is support for
   4  * - OpenFirmware
   5  * - PCI
   6  * - PDEV (generic platform device centralized driver model)
   7  *
   8  * (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
   9  *
  10  */
  11
  12 #include <linux/usb.h>
  13 #include <linux/io.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/usb/isp1760.h>
  17 #include <linux/usb/hcd.h>
  18
  19 #include "isp1760-hcd.h"
  20
  21 #if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
  22 #include <linux/slab.h>
  23 #include <linux/of.h>
  24 #include <linux/of_platform.h>
  25 #include <linux/of_address.h>
  26 #include <linux/of_irq.h>
  27 #include <linux/of_gpio.h>
  28 #endif
  29
  30 #ifdef CONFIG_PCI
  31 #include <linux/pci.h>
  32 #endif
  33
  34 #if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
  35 struct isp1760 {
  36         struct usb_hcd *hcd;
  37         int rst_gpio;
  38 };
  39
  40 static int of_isp1760_probe(struct platform_device *dev)
  41 {
  42         struct isp1760 *drvdata;
  43         struct device_node *dp = dev->dev.of_node;
  44         struct resource *res;
  45         struct resource memory;
  46         int virq;
  47         resource_size_t res_len;
  48         int ret;
  49         unsigned int devflags = 0;
  50         enum of_gpio_flags gpio_flags;
  51         u32 bus_width = 0;
  52
  53         drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
  54         if (!drvdata)
  55                 return -ENOMEM;
  56
  57         ret = of_address_to_resource(dp, 0, &memory);
  58         if (ret) {
  59                 ret = -ENXIO;
  60                 goto free_data;
  61         }
  62
  63         res_len = resource_size(&memory);
  64
  65         res = request_mem_region(memory.start, res_len, dev_name(&dev->dev));
  66         if (!res) {
  67                 ret = -EBUSY;
  68                 goto free_data;
  69         }
  70
  71         virq = irq_of_parse_and_map(dp, 0);
  72         if (!virq) {
  73                 ret = -ENODEV;
  74                 goto release_reg;
  75         }
  76
  77         if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
  78                 devflags |= ISP1760_FLAG_ISP1761;
  79
  80         /* Some systems wire up only 16 of the 32 data lines */
  81         of_property_read_u32(dp, "bus-width", &bus_width);
  82         if (bus_width == 16)
  83                 devflags |= ISP1760_FLAG_BUS_WIDTH_16;
  84
  85         if (of_get_property(dp, "port1-otg", NULL) != NULL)
  86                 devflags |= ISP1760_FLAG_OTG_EN;
  87
  88         if (of_get_property(dp, "analog-oc", NULL) != NULL)
  89                 devflags |= ISP1760_FLAG_ANALOG_OC;
  90
  91         if (of_get_property(dp, "dack-polarity", NULL) != NULL)
  92                 devflags |= ISP1760_FLAG_DACK_POL_HIGH;
  93
  94         if (of_get_property(dp, "dreq-polarity", NULL) != NULL)
  95                 devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
  96
  97         drvdata->rst_gpio = of_get_gpio_flags(dp, 0, &gpio_flags);
  98         if (gpio_is_valid(drvdata->rst_gpio)) {
  99                 ret = gpio_request(drvdata->rst_gpio, dev_name(&dev->dev));
 100                 if (!ret) {
 101                         if (!(gpio_flags & OF_GPIO_ACTIVE_LOW)) {
 102                                 devflags |= ISP1760_FLAG_RESET_ACTIVE_HIGH;
 103                                 gpio_direction_output(drvdata->rst_gpio, 0);
 104                         } else {
 105                                 gpio_direction_output(drvdata->rst_gpio, 1);
 106                         }
 107                 } else {
 108                         drvdata->rst_gpio = ret;
 109                 }
 110         }
 111
 112         drvdata->hcd = isp1760_register(memory.start, res_len, virq,
 113                                         IRQF_SHARED, drvdata->rst_gpio,
 114                                         &dev->dev, dev_name(&dev->dev),
 115                                         devflags);
 116         if (IS_ERR(drvdata->hcd)) {
 117                 ret = PTR_ERR(drvdata->hcd);
 118                 goto free_gpio;
 119         }
 120
 121         platform_set_drvdata(dev, drvdata);
 122         return ret;
 123
 124 free_gpio:
 125         if (gpio_is_valid(drvdata->rst_gpio))
 126                 gpio_free(drvdata->rst_gpio);
 127 release_reg:
 128         release_mem_region(memory.start, res_len);
 129 free_data:
 130         kfree(drvdata);
 131         return ret;
 132 }
 133
 134 static int of_isp1760_remove(struct platform_device *dev)
 135 {
 136         struct isp1760 *drvdata = platform_get_drvdata(dev);
 137
 138         usb_remove_hcd(drvdata->hcd);
 139         iounmap(drvdata->hcd->regs);
 140         release_mem_region(drvdata->hcd->rsrc_start, drvdata->hcd->rsrc_len);
 141         usb_put_hcd(drvdata->hcd);
 142
 143         if (gpio_is_valid(drvdata->rst_gpio))
 144                 gpio_free(drvdata->rst_gpio);
 145
 146         kfree(drvdata);
 147         return 0;
 148 }
 149
 150 static const struct of_device_id of_isp1760_match[] = {
 151         {
 152                 .compatible = "nxp,usb-isp1760",
 153         },
 154         {
 155                 .compatible = "nxp,usb-isp1761",
 156         },
 157         { },
 158 };
 159 MODULE_DEVICE_TABLE(of, of_isp1760_match);
 160
 161 static struct platform_driver isp1760_of_driver = {
 162         .driver = {
 163                 .name = "nxp-isp1760",
 164                 .owner = THIS_MODULE,
 165                 .of_match_table = of_isp1760_match,
 166         },
 167         .probe          = of_isp1760_probe,
 168         .remove         = of_isp1760_remove,
 169 };
 170 #endif
 171
 172 #ifdef CONFIG_PCI
 173 static int isp1761_pci_probe(struct pci_dev *dev,
 174                 const struct pci_device_id *id)
 175 {
 176         u8 latency, limit;
 177         __u32 reg_data;
 178         int retry_count;
 179         struct usb_hcd *hcd;
 180         unsigned int devflags = 0;
 181         int ret_status = 0;
 182
 183         resource_size_t pci_mem_phy0;
 184         resource_size_t memlength;
 185
 186         u8 __iomem *chip_addr;
 187         u8 __iomem *iobase;
 188         resource_size_t nxp_pci_io_base;
 189         resource_size_t iolength;
 190
 191         if (usb_disabled())
 192                 return -ENODEV;
 193
 194         if (pci_enable_device(dev) < 0)
 195                 return -ENODEV;
 196
 197         if (!dev->irq)
 198                 return -ENODEV;
 199
 200         /* Grab the PLX PCI mem maped port start address we need  */
 201         nxp_pci_io_base = pci_resource_start(dev, 0);
 202         iolength = pci_resource_len(dev, 0);
 203
 204         if (!request_mem_region(nxp_pci_io_base, iolength, "ISP1761 IO MEM")) {
 205                 printk(KERN_ERR "request region #1\n");
 206                 return -EBUSY;
 207         }
 208
 209         iobase = ioremap_nocache(nxp_pci_io_base, iolength);
 210         if (!iobase) {
 211                 printk(KERN_ERR "ioremap #1\n");
 212                 ret_status = -ENOMEM;
 213                 goto cleanup1;
 214         }
 215         /* Grab the PLX PCI shared memory of the ISP 1761 we need  */
 216         pci_mem_phy0 = pci_resource_start(dev, 3);
 217         memlength = pci_resource_len(dev, 3);
 218         if (memlength < 0xffff) {
 219                 printk(KERN_ERR "memory length for this resource is wrong\n");
 220                 ret_status = -ENOMEM;
 221                 goto cleanup2;
 222         }
 223
 224         if (!request_mem_region(pci_mem_phy0, memlength, "ISP-PCI")) {
 225                 printk(KERN_ERR "host controller already in use\n");
 226                 ret_status = -EBUSY;
 227                 goto cleanup2;
 228         }
 229
 230         /* map available memory */
 231         chip_addr = ioremap_nocache(pci_mem_phy0,memlength);
 232         if (!chip_addr) {
 233                 printk(KERN_ERR "Error ioremap failed\n");
 234                 ret_status = -ENOMEM;
 235                 goto cleanup3;
 236         }
 237
 238         /* bad pci latencies can contribute to overruns */
 239         pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
 240         if (latency) {
 241                 pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
 242                 if (limit && limit < latency)
 243                         pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
 244         }
 245
 246         /* Try to check whether we can access Scratch Register of
 247          * Host Controller or not. The initial PCI access is retried until
 248          * local init for the PCI bridge is completed
 249          */
 250         retry_count = 20;
 251         reg_data = 0;
 252         while ((reg_data != 0xFACE) && retry_count) {
 253                 /*by default host is in 16bit mode, so
 254                  * io operations at this stage must be 16 bit
 255                  * */
 256                 writel(0xface, chip_addr + HC_SCRATCH_REG);
 257                 udelay(100);
 258                 reg_data = readl(chip_addr + HC_SCRATCH_REG) & 0x0000ffff;
 259                 retry_count--;
 260         }
 261
 262         iounmap(chip_addr);
 263
 264         /* Host Controller presence is detected by writing to scratch register
 265          * and reading back and checking the contents are same or not
 266          */
 267         if (reg_data != 0xFACE) {
 268                 dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data);
 269                 ret_status = -ENOMEM;
 270                 goto cleanup3;
 271         }
 272
 273         pci_set_master(dev);
 274
 275         /* configure PLX PCI chip to pass interrupts */
 276 #define PLX_INT_CSR_REG 0x68
 277         reg_data = readl(iobase + PLX_INT_CSR_REG);
 278         reg_data |= 0x900;
 279         writel(reg_data, iobase + PLX_INT_CSR_REG);
 280
 281         dev->dev.dma_mask = NULL;
 282         hcd = isp1760_register(pci_mem_phy0, memlength, dev->irq,
 283                 IRQF_SHARED, -ENOENT, &dev->dev, dev_name(&dev->dev),
 284                 devflags);
 285         if (IS_ERR(hcd)) {
 286                 ret_status = -ENODEV;
 287                 goto cleanup3;
 288         }
 289
 290         /* done with PLX IO access */
 291         iounmap(iobase);
 292         release_mem_region(nxp_pci_io_base, iolength);
 293
 294         pci_set_drvdata(dev, hcd);
 295         return 0;
 296
 297 cleanup3:
 298         release_mem_region(pci_mem_phy0, memlength);
 299 cleanup2:
 300         iounmap(iobase);
 301 cleanup1:
 302         release_mem_region(nxp_pci_io_base, iolength);
 303         return ret_status;
 304 }
 305
 306 static void isp1761_pci_remove(struct pci_dev *dev)
 307 {
 308         struct usb_hcd *hcd;
 309
 310         hcd = pci_get_drvdata(dev);
 311
 312         usb_remove_hcd(hcd);
 313         iounmap(hcd->regs);
 314         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 315         usb_put_hcd(hcd);
 316
 317         pci_disable_device(dev);
 318 }
 319
 320 static void isp1761_pci_shutdown(struct pci_dev *dev)
 321 {
 322         printk(KERN_ERR "ips1761_pci_shutdown\n");
 323 }
 324
 325 static const struct pci_device_id isp1760_plx [] = {
 326         {
 327                 .class          = PCI_CLASS_BRIDGE_OTHER << 8,
 328                 .class_mask     = ~0,
 329                 .vendor         = PCI_VENDOR_ID_PLX,
 330                 .device         = 0x5406,
 331                 .subvendor      = PCI_VENDOR_ID_PLX,
 332                 .subdevice      = 0x9054,
 333         },
 334         { }
 335 };
 336 MODULE_DEVICE_TABLE(pci, isp1760_plx);
 337
 338 static struct pci_driver isp1761_pci_driver = {
 339         .name =         "isp1760",
 340         .id_table =     isp1760_plx,
 341         .probe =        isp1761_pci_probe,
 342         .remove =       isp1761_pci_remove,
 343         .shutdown =     isp1761_pci_shutdown,
 344 };
 345 #endif
 346
 347 static int isp1760_plat_probe(struct platform_device *pdev)
 348 {
 349         int ret = 0;
 350         struct usb_hcd *hcd;
 351         struct resource *mem_res;
 352         struct resource *irq_res;
 353         resource_size_t mem_size;
 354         struct isp1760_platform_data *priv = dev_get_platdata(&pdev->dev);
 355         unsigned int devflags = 0;
 356         unsigned long irqflags = IRQF_SHARED;
 357
 358         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 359         if (!mem_res) {
 360                 pr_warning("isp1760: Memory resource not available\n");
 361                 ret = -ENODEV;
 362                 goto out;
 363         }
 364         mem_size = resource_size(mem_res);
 365         if (!request_mem_region(mem_res->start, mem_size, "isp1760")) {
 366                 pr_warning("isp1760: Cannot reserve the memory resource\n");
 367                 ret = -EBUSY;
 368                 goto out;
 369         }
 370
 371         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 372         if (!irq_res) {
 373                 pr_warning("isp1760: IRQ resource not available\n");
 374                 ret = -ENODEV;
 375                 goto cleanup;
 376         }
 377
 378         irqflags |= irq_res->flags & IRQF_TRIGGER_MASK;
 379
 380         if (priv) {
 381                 if (priv->is_isp1761)
 382                         devflags |= ISP1760_FLAG_ISP1761;
 383                 if (priv->bus_width_16)
 384                         devflags |= ISP1760_FLAG_BUS_WIDTH_16;
 385                 if (priv->port1_otg)
 386                         devflags |= ISP1760_FLAG_OTG_EN;
 387                 if (priv->analog_oc)
 388                         devflags |= ISP1760_FLAG_ANALOG_OC;
 389                 if (priv->dack_polarity_high)
 390                         devflags |= ISP1760_FLAG_DACK_POL_HIGH;
 391                 if (priv->dreq_polarity_high)
 392                         devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
 393         }
 394
 395         hcd = isp1760_register(mem_res->start, mem_size, irq_res->start,
 396                                irqflags, -ENOENT,
 397                                &pdev->dev, dev_name(&pdev->dev), devflags);
 398
 399         platform_set_drvdata(pdev, hcd);
 400
 401         if (IS_ERR(hcd)) {
 402                 pr_warning("isp1760: Failed to register the HCD device\n");
 403                 ret = -ENODEV;
 404                 goto cleanup;
 405         }
 406
 407         pr_info("ISP1760 USB device initialised\n");
 408         return ret;
 409
 410 cleanup:
 411         release_mem_region(mem_res->start, mem_size);
 412 out:
 413         return ret;
 414 }
 415
 416 static int isp1760_plat_remove(struct platform_device *pdev)
 417 {
 418         struct resource *mem_res;
 419         resource_size_t mem_size;
 420         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 421
 422         usb_remove_hcd(hcd);
 423
 424         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 425         mem_size = resource_size(mem_res);
 426         release_mem_region(mem_res->start, mem_size);
 427
 428         usb_put_hcd(hcd);
 429
 430         return 0;
 431 }
 432
 433 static struct platform_driver isp1760_plat_driver = {
 434         .probe  = isp1760_plat_probe,
 435         .remove = isp1760_plat_remove,
 436         .driver = {
 437                 .name   = "isp1760",
 438         },
 439 };
 440
 441 static int __init isp1760_init(void)
 442 {
 443         int ret, any_ret = -ENODEV;
 444
 445         init_kmem_once();
 446
 447         ret = platform_driver_register(&isp1760_plat_driver);
 448         if (!ret)
 449                 any_ret = 0;
 450 #if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
 451         ret = platform_driver_register(&isp1760_of_driver);
 452         if (!ret)
 453                 any_ret = 0;
 454 #endif
 455 #ifdef CONFIG_PCI
 456         ret = pci_register_driver(&isp1761_pci_driver);
 457         if (!ret)
 458                 any_ret = 0;
 459 #endif
 460
 461         if (any_ret)
 462                 deinit_kmem_cache();
 463         return any_ret;
 464 }
 465 module_init(isp1760_init);
 466
 467 static void __exit isp1760_exit(void)
 468 {
 469         platform_driver_unregister(&isp1760_plat_driver);
 470 #if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
 471         platform_driver_unregister(&isp1760_of_driver);
 472 #endif
 473 #ifdef CONFIG_PCI
 474         pci_unregister_driver(&isp1761_pci_driver);
 475 #endif
 476         deinit_kmem_cache();
 477 }
 478 module_exit(isp1760_exit);