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  *
   7  * (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
   8  *
   9  */
  10
  11 #include <linux/usb.h>
  12 #include <linux/io.h>
  13
  14 #include "../core/hcd.h"
  15 #include "isp1760-hcd.h"
  16
  17 #ifdef CONFIG_PPC_OF
  18 #include <linux/of.h>
  19 #include <linux/of_platform.h>
  20 #endif
  21
  22 #ifdef CONFIG_PCI
  23 #include <linux/pci.h>
  24 #endif
  25
  26 #ifdef CONFIG_PPC_OF
  27 static int of_isp1760_probe(struct of_device *dev,
  28                 const struct of_device_id *match)
  29 {
  30         struct usb_hcd *hcd;
  31         struct device_node *dp = dev->node;
  32         struct resource *res;
  33         struct resource memory;
  34         struct of_irq oirq;
  35         int virq;
  36         u64 res_len;
  37         int ret;
  38         const unsigned int *prop;
  39         unsigned int devflags = 0;
  40
  41         ret = of_address_to_resource(dp, 0, &memory);
  42         if (ret)
  43                 return -ENXIO;
  44
  45         res = request_mem_region(memory.start, memory.end - memory.start + 1,
  46                         dev_name(&dev->dev));
  47         if (!res)
  48                 return -EBUSY;
  49
  50         res_len = memory.end - memory.start + 1;
  51
  52         if (of_irq_map_one(dp, 0, &oirq)) {
  53                 ret = -ENODEV;
  54                 goto release_reg;
  55         }
  56
  57         virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
  58                         oirq.size);
  59
  60         if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
  61                 devflags |= ISP1760_FLAG_ISP1761;
  62
  63         if (of_get_property(dp, "port1-disable", NULL) != NULL)
  64                 devflags |= ISP1760_FLAG_PORT1_DIS;
  65
  66         /* Some systems wire up only 16 of the 32 data lines */
  67         prop = of_get_property(dp, "bus-width", NULL);
  68         if (prop && *prop == 16)
  69                 devflags |= ISP1760_FLAG_BUS_WIDTH_16;
  70
  71         if (of_get_property(dp, "port1-otg", NULL) != NULL)
  72                 devflags |= ISP1760_FLAG_OTG_EN;
  73
  74         if (of_get_property(dp, "analog-oc", NULL) != NULL)
  75                 devflags |= ISP1760_FLAG_ANALOG_OC;
  76
  77         if (of_get_property(dp, "dack-polarity", NULL) != NULL)
  78                 devflags |= ISP1760_FLAG_DACK_POL_HIGH;
  79
  80         if (of_get_property(dp, "dreq-polarity", NULL) != NULL)
  81                 devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
  82
  83         hcd = isp1760_register(memory.start, res_len, virq,
  84                 IRQF_SHARED | IRQF_DISABLED, &dev->dev, dev_name(&dev->dev),
  85                 devflags);
  86         if (IS_ERR(hcd)) {
  87                 ret = PTR_ERR(hcd);
  88                 goto release_reg;
  89         }
  90
  91         dev_set_drvdata(&dev->dev, hcd);
  92         return ret;
  93
  94 release_reg:
  95         release_mem_region(memory.start, memory.end - memory.start + 1);
  96         return ret;
  97 }
  98
  99 static int of_isp1760_remove(struct of_device *dev)
 100 {
 101         struct usb_hcd *hcd = dev_get_drvdata(&dev->dev);
 102
 103         dev_set_drvdata(&dev->dev, NULL);
 104
 105         usb_remove_hcd(hcd);
 106         iounmap(hcd->regs);
 107         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 108         usb_put_hcd(hcd);
 109         return 0;
 110 }
 111
 112 static struct of_device_id of_isp1760_match[] = {
 113         {
 114                 .compatible = "nxp,usb-isp1760",
 115         },
 116         {
 117                 .compatible = "nxp,usb-isp1761",
 118         },
 119         { },
 120 };
 121 MODULE_DEVICE_TABLE(of, of_isp1760_match);
 122
 123 static struct of_platform_driver isp1760_of_driver = {
 124         .name           = "nxp-isp1760",
 125         .match_table    = of_isp1760_match,
 126         .probe          = of_isp1760_probe,
 127         .remove         = of_isp1760_remove,
 128 };
 129 #endif
 130
 131 #ifdef CONFIG_PCI
 132 static int __devinit isp1761_pci_probe(struct pci_dev *dev,
 133                 const struct pci_device_id *id)
 134 {
 135         u8 latency, limit;
 136         __u32 reg_data;
 137         int retry_count;
 138         struct usb_hcd *hcd;
 139         unsigned int devflags = 0;
 140         int ret_status = 0;
 141
 142         resource_size_t pci_mem_phy0;
 143         resource_size_t memlength;
 144
 145         u8 __iomem *chip_addr;
 146         u8 __iomem *iobase;
 147         resource_size_t nxp_pci_io_base;
 148         resource_size_t iolength;
 149
 150         if (usb_disabled())
 151                 return -ENODEV;
 152
 153         if (pci_enable_device(dev) < 0)
 154                 return -ENODEV;
 155
 156         if (!dev->irq)
 157                 return -ENODEV;
 158
 159         /* Grab the PLX PCI mem maped port start address we need  */
 160         nxp_pci_io_base = pci_resource_start(dev, 0);
 161         iolength = pci_resource_len(dev, 0);
 162
 163         if (!request_mem_region(nxp_pci_io_base, iolength, "ISP1761 IO MEM")) {
 164                 printk(KERN_ERR "request region #1\n");
 165                 return -EBUSY;
 166         }
 167
 168         iobase = ioremap_nocache(nxp_pci_io_base, iolength);
 169         if (!iobase) {
 170                 printk(KERN_ERR "ioremap #1\n");
 171                 ret_status = -ENOMEM;
 172                 goto cleanup1;
 173         }
 174         /* Grab the PLX PCI shared memory of the ISP 1761 we need  */
 175         pci_mem_phy0 = pci_resource_start(dev, 3);
 176         memlength = pci_resource_len(dev, 3);
 177         if (memlength < 0xffff) {
 178                 printk(KERN_ERR "memory length for this resource is wrong\n");
 179                 ret_status = -ENOMEM;
 180                 goto cleanup2;
 181         }
 182
 183         if (!request_mem_region(pci_mem_phy0, memlength, "ISP-PCI")) {
 184                 printk(KERN_ERR "host controller already in use\n");
 185                 ret_status = -EBUSY;
 186                 goto cleanup2;
 187         }
 188
 189         /* map available memory */
 190         chip_addr = ioremap_nocache(pci_mem_phy0,memlength);
 191         if (!chip_addr) {
 192                 printk(KERN_ERR "Error ioremap failed\n");
 193                 ret_status = -ENOMEM;
 194                 goto cleanup3;
 195         }
 196
 197         /* bad pci latencies can contribute to overruns */
 198         pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
 199         if (latency) {
 200                 pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
 201                 if (limit && limit < latency)
 202                         pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
 203         }
 204
 205         /* Try to check whether we can access Scratch Register of
 206          * Host Controller or not. The initial PCI access is retried until
 207          * local init for the PCI bridge is completed
 208          */
 209         retry_count = 20;
 210         reg_data = 0;
 211         while ((reg_data != 0xFACE) && retry_count) {
 212                 /*by default host is in 16bit mode, so
 213                  * io operations at this stage must be 16 bit
 214                  * */
 215                 writel(0xface, chip_addr + HC_SCRATCH_REG);
 216                 udelay(100);
 217                 reg_data = readl(chip_addr + HC_SCRATCH_REG) & 0x0000ffff;
 218                 retry_count--;
 219         }
 220
 221         iounmap(chip_addr);
 222
 223         /* Host Controller presence is detected by writing to scratch register
 224          * and reading back and checking the contents are same or not
 225          */
 226         if (reg_data != 0xFACE) {
 227                 err("scratch register mismatch %x", reg_data);
 228                 ret_status = -ENOMEM;
 229                 goto cleanup3;
 230         }
 231
 232         pci_set_master(dev);
 233
 234         /* configure PLX PCI chip to pass interrupts */
 235 #define PLX_INT_CSR_REG 0x68
 236         reg_data = readl(iobase + PLX_INT_CSR_REG);
 237         reg_data |= 0x900;
 238         writel(reg_data, iobase + PLX_INT_CSR_REG);
 239
 240         dev->dev.dma_mask = NULL;
 241         hcd = isp1760_register(pci_mem_phy0, memlength, dev->irq,
 242                 IRQF_SHARED | IRQF_DISABLED, &dev->dev, dev_name(&dev->dev),
 243                 devflags);
 244         if (IS_ERR(hcd)) {
 245                 ret_status = -ENODEV;
 246                 goto cleanup3;
 247         }
 248
 249         /* done with PLX IO access */
 250         iounmap(iobase);
 251         release_mem_region(nxp_pci_io_base, iolength);
 252
 253         pci_set_drvdata(dev, hcd);
 254         return 0;
 255
 256 cleanup3:
 257         release_mem_region(pci_mem_phy0, memlength);
 258 cleanup2:
 259         iounmap(iobase);
 260 cleanup1:
 261         release_mem_region(nxp_pci_io_base, iolength);
 262         return ret_status;
 263 }
 264
 265 static void isp1761_pci_remove(struct pci_dev *dev)
 266 {
 267         struct usb_hcd *hcd;
 268
 269         hcd = pci_get_drvdata(dev);
 270
 271         usb_remove_hcd(hcd);
 272         iounmap(hcd->regs);
 273         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 274         usb_put_hcd(hcd);
 275
 276         pci_disable_device(dev);
 277 }
 278
 279 static void isp1761_pci_shutdown(struct pci_dev *dev)
 280 {
 281         printk(KERN_ERR "ips1761_pci_shutdown\n");
 282 }
 283
 284 static const struct pci_device_id isp1760_plx [] = {
 285         {
 286                 .class          = PCI_CLASS_BRIDGE_OTHER << 8,
 287                 .class_mask     = ~0,
 288                 .vendor         = PCI_VENDOR_ID_PLX,
 289                 .device         = 0x5406,
 290                 .subvendor      = PCI_VENDOR_ID_PLX,
 291                 .subdevice      = 0x9054,
 292         },
 293         { }
 294 };
 295 MODULE_DEVICE_TABLE(pci, isp1760_plx);
 296
 297 static struct pci_driver isp1761_pci_driver = {
 298         .name =         "isp1760",
 299         .id_table =     isp1760_plx,
 300         .probe =        isp1761_pci_probe,
 301         .remove =       isp1761_pci_remove,
 302         .shutdown =     isp1761_pci_shutdown,
 303 };
 304 #endif
 305
 306 static int __init isp1760_init(void)
 307 {
 308         int ret;
 309
 310         init_kmem_once();
 311
 312 #ifdef CONFIG_PPC_OF
 313         ret = of_register_platform_driver(&isp1760_of_driver);
 314         if (ret) {
 315                 deinit_kmem_cache();
 316                 return ret;
 317         }
 318 #endif
 319 #ifdef CONFIG_PCI
 320         ret = pci_register_driver(&isp1761_pci_driver);
 321         if (ret)
 322                 goto unreg_of;
 323 #endif
 324         return ret;
 325
 326 #ifdef CONFIG_PCI
 327 unreg_of:
 328 #endif
 329 #ifdef CONFIG_PPC_OF
 330         of_unregister_platform_driver(&isp1760_of_driver);
 331 #endif
 332         deinit_kmem_cache();
 333         return ret;
 334 }
 335 module_init(isp1760_init);
 336
 337 static void __exit isp1760_exit(void)
 338 {
 339 #ifdef CONFIG_PPC_OF
 340         of_unregister_platform_driver(&isp1760_of_driver);
 341 #endif
 342 #ifdef CONFIG_PCI
 343         pci_unregister_driver(&isp1761_pci_driver);
 344 #endif
 345         deinit_kmem_cache();
 346 }
 347 module_exit(isp1760_exit);