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