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 #ifdef CONFIG_OF
  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 #ifdef CONFIG_OF
  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         struct of_irq oirq;
  47         int virq;
  48         resource_size_t res_len;
  49         int ret;
  50         const unsigned int *prop;
  51         unsigned int devflags = 0;
  52         enum of_gpio_flags gpio_flags;
  53
  54         drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
  55         if (!drvdata)
  56                 return -ENOMEM;
  57
  58         ret = of_address_to_resource(dp, 0, &memory);
  59         if (ret)
  60                 return -ENXIO;
  61
  62         res_len = resource_size(&memory);
  63
  64         res = request_mem_region(memory.start, res_len, dev_name(&dev->dev));
  65         if (!res)
  66                 return -EBUSY;
  67
  68         if (of_irq_map_one(dp, 0, &oirq)) {
  69                 ret = -ENODEV;
  70                 goto release_reg;
  71         }
  72
  73         virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
  74                         oirq.size);
  75
  76         if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
  77                 devflags |= ISP1760_FLAG_ISP1761;
  78
  79         /* Some systems wire up only 16 of the 32 data lines */
  80         prop = of_get_property(dp, "bus-width", NULL);
  81         if (prop && *prop == 16)
  82                 devflags |= ISP1760_FLAG_BUS_WIDTH_16;
  83
  84         if (of_get_property(dp, "port1-otg", NULL) != NULL)
  85                 devflags |= ISP1760_FLAG_OTG_EN;
  86
  87         if (of_get_property(dp, "analog-oc", NULL) != NULL)
  88                 devflags |= ISP1760_FLAG_ANALOG_OC;
  89
  90         if (of_get_property(dp, "dack-polarity", NULL) != NULL)
  91                 devflags |= ISP1760_FLAG_DACK_POL_HIGH;
  92
  93         if (of_get_property(dp, "dreq-polarity", NULL) != NULL)
  94                 devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
  95
  96         drvdata->rst_gpio = of_get_gpio_flags(dp, 0, &gpio_flags);
  97         if (gpio_is_valid(drvdata->rst_gpio)) {
  98                 ret = gpio_request(drvdata->rst_gpio, dev_name(&dev->dev));
  99                 if (!ret) {
 100                         if (!(gpio_flags & OF_GPIO_ACTIVE_LOW)) {
 101                                 devflags |= ISP1760_FLAG_RESET_ACTIVE_HIGH;
 102                                 gpio_direction_output(drvdata->rst_gpio, 0);
 103                         } else {
 104                                 gpio_direction_output(drvdata->rst_gpio, 1);
 105                         }
 106                 } else {
 107                         drvdata->rst_gpio = ret;
 108                 }
 109         }
 110
 111         drvdata->hcd = isp1760_register(memory.start, res_len, virq,
 112                                         IRQF_SHARED, drvdata->rst_gpio,
 113                                         &dev->dev, dev_name(&dev->dev),
 114                                         devflags);
 115         if (IS_ERR(drvdata->hcd)) {
 116                 ret = PTR_ERR(drvdata->hcd);
 117                 goto free_gpio;
 118         }
 119
 120         dev_set_drvdata(&dev->dev, drvdata);
 121         return ret;
 122
 123 free_gpio:
 124         if (gpio_is_valid(drvdata->rst_gpio))
 125                 gpio_free(drvdata->rst_gpio);
 126 release_reg:
 127         release_mem_region(memory.start, res_len);
 128         kfree(drvdata);
 129         return ret;
 130 }
 131
 132 static int of_isp1760_remove(struct platform_device *dev)
 133 {
 134         struct isp1760 *drvdata = dev_get_drvdata(&dev->dev);
 135
 136         dev_set_drvdata(&dev->dev, NULL);
 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 __devinit 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 __devinit 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 = pdev->dev.platform_data;
 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                 return -ENODEV;
 375         }
 376         irqflags |= irq_res->flags & IRQF_TRIGGER_MASK;
 377
 378         if (priv) {
 379                 if (priv->is_isp1761)
 380                         devflags |= ISP1760_FLAG_ISP1761;
 381                 if (priv->bus_width_16)
 382                         devflags |= ISP1760_FLAG_BUS_WIDTH_16;
 383                 if (priv->port1_otg)
 384                         devflags |= ISP1760_FLAG_OTG_EN;
 385                 if (priv->analog_oc)
 386                         devflags |= ISP1760_FLAG_ANALOG_OC;
 387                 if (priv->dack_polarity_high)
 388                         devflags |= ISP1760_FLAG_DACK_POL_HIGH;
 389                 if (priv->dreq_polarity_high)
 390                         devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
 391         }
 392
 393         hcd = isp1760_register(mem_res->start, mem_size, irq_res->start,
 394                                irqflags, -ENOENT,
 395                                &pdev->dev, dev_name(&pdev->dev), devflags);
 396         if (IS_ERR(hcd)) {
 397                 pr_warning("isp1760: Failed to register the HCD device\n");
 398                 ret = -ENODEV;
 399                 goto cleanup;
 400         }
 401
 402         pr_info("ISP1760 USB device initialised\n");
 403         return ret;
 404
 405 cleanup:
 406         release_mem_region(mem_res->start, mem_size);
 407 out:
 408         return ret;
 409 }
 410
 411 static int __devexit isp1760_plat_remove(struct platform_device *pdev)
 412 {
 413         struct resource *mem_res;
 414         resource_size_t mem_size;
 415
 416         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 417         mem_size = resource_size(mem_res);
 418         release_mem_region(mem_res->start, mem_size);
 419
 420         return 0;
 421 }
 422
 423 static struct platform_driver isp1760_plat_driver = {
 424         .probe  = isp1760_plat_probe,
 425         .remove = __devexit_p(isp1760_plat_remove),
 426         .driver = {
 427                 .name   = "isp1760",
 428         },
 429 };
 430
 431 static int __init isp1760_init(void)
 432 {
 433         int ret, any_ret = -ENODEV;
 434
 435         init_kmem_once();
 436
 437         ret = platform_driver_register(&isp1760_plat_driver);
 438         if (!ret)
 439                 any_ret = 0;
 440 #ifdef CONFIG_OF
 441         ret = platform_driver_register(&isp1760_of_driver);
 442         if (!ret)
 443                 any_ret = 0;
 444 #endif
 445 #ifdef CONFIG_PCI
 446         ret = pci_register_driver(&isp1761_pci_driver);
 447         if (!ret)
 448                 any_ret = 0;
 449 #endif
 450
 451         if (any_ret)
 452                 deinit_kmem_cache();
 453         return any_ret;
 454 }
 455 module_init(isp1760_init);
 456
 457 static void __exit isp1760_exit(void)
 458 {
 459         platform_driver_unregister(&isp1760_plat_driver);
 460 #ifdef CONFIG_OF
 461         platform_driver_unregister(&isp1760_of_driver);
 462 #endif
 463 #ifdef CONFIG_PCI
 464         pci_unregister_driver(&isp1761_pci_driver);
 465 #endif
 466         deinit_kmem_cache();
 467 }
 468 module_exit(isp1760_exit);