drivers/usb/isp1760/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/of.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18 #include <linux/usb/isp1760.h>
  19 #include <linux/usb/hcd.h>
  20
  21 #include "isp1760-core.h"
  22 #include "isp1760-regs.h"
  23
  24 #ifdef CONFIG_PCI
  25 #include <linux/pci.h>
  26 #endif
  27
  28 #ifdef CONFIG_PCI
  29 static int isp1761_pci_init(struct pci_dev *dev)
  30 {
  31         resource_size_t mem_start;
  32         resource_size_t mem_length;
  33         u8 __iomem *iobase;
  34         u8 latency, limit;
  35         int retry_count;
  36         u32 reg_data;
  37
  38         /* Grab the PLX PCI shared memory of the ISP 1761 we need  */
  39         mem_start = pci_resource_start(dev, 3);
  40         mem_length = pci_resource_len(dev, 3);
  41         if (mem_length < 0xffff) {
  42                 printk(KERN_ERR "memory length for this resource is wrong\n");
  43                 return -ENOMEM;
  44         }
  45
  46         if (!request_mem_region(mem_start, mem_length, "ISP-PCI")) {
  47                 printk(KERN_ERR "host controller already in use\n");
  48                 return -EBUSY;
  49         }
  50
  51         /* map available memory */
  52         iobase = ioremap_nocache(mem_start, mem_length);
  53         if (!iobase) {
  54                 printk(KERN_ERR "Error ioremap failed\n");
  55                 release_mem_region(mem_start, mem_length);
  56                 return -ENOMEM;
  57         }
  58
  59         /* bad pci latencies can contribute to overruns */
  60         pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
  61         if (latency) {
  62                 pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
  63                 if (limit && limit < latency)
  64                         pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
  65         }
  66
  67         /* Try to check whether we can access Scratch Register of
  68          * Host Controller or not. The initial PCI access is retried until
  69          * local init for the PCI bridge is completed
  70          */
  71         retry_count = 20;
  72         reg_data = 0;
  73         while ((reg_data != 0xFACE) && retry_count) {
  74                 /*by default host is in 16bit mode, so
  75                  * io operations at this stage must be 16 bit
  76                  * */
  77                 writel(0xface, iobase + HC_SCRATCH_REG);
  78                 udelay(100);
  79                 reg_data = readl(iobase + HC_SCRATCH_REG) & 0x0000ffff;
  80                 retry_count--;
  81         }
  82
  83         iounmap(iobase);
  84         release_mem_region(mem_start, mem_length);
  85
  86         /* Host Controller presence is detected by writing to scratch register
  87          * and reading back and checking the contents are same or not
  88          */
  89         if (reg_data != 0xFACE) {
  90                 dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data);
  91                 return -ENOMEM;
  92         }
  93
  94         /* Grab the PLX PCI mem maped port start address we need  */
  95         mem_start = pci_resource_start(dev, 0);
  96         mem_length = pci_resource_len(dev, 0);
  97
  98         if (!request_mem_region(mem_start, mem_length, "ISP1761 IO MEM")) {
  99                 printk(KERN_ERR "request region #1\n");
 100                 return -EBUSY;
 101         }
 102
 103         iobase = ioremap_nocache(mem_start, mem_length);
 104         if (!iobase) {
 105                 printk(KERN_ERR "ioremap #1\n");
 106                 release_mem_region(mem_start, mem_length);
 107                 return -ENOMEM;
 108         }
 109
 110         /* configure PLX PCI chip to pass interrupts */
 111 #define PLX_INT_CSR_REG 0x68
 112         reg_data = readl(iobase + PLX_INT_CSR_REG);
 113         reg_data |= 0x900;
 114         writel(reg_data, iobase + PLX_INT_CSR_REG);
 115
 116         /* done with PLX IO access */
 117         iounmap(iobase);
 118         release_mem_region(mem_start, mem_length);
 119
 120         return 0;
 121 }
 122
 123 static int isp1761_pci_probe(struct pci_dev *dev,
 124                 const struct pci_device_id *id)
 125 {
 126         unsigned int devflags = 0;
 127         int ret;
 128
 129         if (usb_disabled())
 130                 return -ENODEV;
 131
 132         if (!dev->irq)
 133                 return -ENODEV;
 134
 135         if (pci_enable_device(dev) < 0)
 136                 return -ENODEV;
 137
 138         ret = isp1761_pci_init(dev);
 139         if (ret < 0)
 140                 goto error;
 141
 142         pci_set_master(dev);
 143
 144         dev->dev.dma_mask = NULL;
 145         ret = isp1760_register(&dev->resource[3], dev->irq, 0, &dev->dev,
 146                                devflags);
 147         if (ret < 0)
 148                 goto error;
 149
 150         return 0;
 151
 152 error:
 153         pci_disable_device(dev);
 154         return ret;
 155 }
 156
 157 static void isp1761_pci_remove(struct pci_dev *dev)
 158 {
 159         isp1760_unregister(&dev->dev);
 160
 161         pci_disable_device(dev);
 162 }
 163
 164 static void isp1761_pci_shutdown(struct pci_dev *dev)
 165 {
 166         printk(KERN_ERR "ips1761_pci_shutdown\n");
 167 }
 168
 169 static const struct pci_device_id isp1760_plx [] = {
 170         {
 171                 .class          = PCI_CLASS_BRIDGE_OTHER << 8,
 172                 .class_mask     = ~0,
 173                 .vendor         = PCI_VENDOR_ID_PLX,
 174                 .device         = 0x5406,
 175                 .subvendor      = PCI_VENDOR_ID_PLX,
 176                 .subdevice      = 0x9054,
 177         },
 178         { }
 179 };
 180 MODULE_DEVICE_TABLE(pci, isp1760_plx);
 181
 182 static struct pci_driver isp1761_pci_driver = {
 183         .name =         "isp1760",
 184         .id_table =     isp1760_plx,
 185         .probe =        isp1761_pci_probe,
 186         .remove =       isp1761_pci_remove,
 187         .shutdown =     isp1761_pci_shutdown,
 188 };
 189 #endif
 190
 191 static int isp1760_plat_probe(struct platform_device *pdev)
 192 {
 193         unsigned long irqflags;
 194         unsigned int devflags = 0;
 195         struct resource *mem_res;
 196         struct resource *irq_res;
 197         int ret;
 198
 199         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 200
 201         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 202         if (!irq_res) {
 203                 pr_warning("isp1760: IRQ resource not available\n");
 204                 return -ENODEV;
 205         }
 206         irqflags = irq_res->flags & IRQF_TRIGGER_MASK;
 207
 208         if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
 209                 struct device_node *dp = pdev->dev.of_node;
 210                 u32 bus_width = 0;
 211
 212                 if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
 213                         devflags |= ISP1760_FLAG_ISP1761;
 214
 215                 /* Some systems wire up only 16 of the 32 data lines */
 216                 of_property_read_u32(dp, "bus-width", &bus_width);
 217                 if (bus_width == 16)
 218                         devflags |= ISP1760_FLAG_BUS_WIDTH_16;
 219
 220                 if (of_property_read_bool(dp, "port1-otg"))
 221                         devflags |= ISP1760_FLAG_OTG_EN;
 222
 223                 if (of_property_read_bool(dp, "analog-oc"))
 224                         devflags |= ISP1760_FLAG_ANALOG_OC;
 225
 226                 if (of_property_read_bool(dp, "dack-polarity"))
 227                         devflags |= ISP1760_FLAG_DACK_POL_HIGH;
 228
 229                 if (of_property_read_bool(dp, "dreq-polarity"))
 230                         devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
 231         } else if (dev_get_platdata(&pdev->dev)) {
 232                 struct isp1760_platform_data *pdata =
 233                         dev_get_platdata(&pdev->dev);
 234
 235                 if (pdata->is_isp1761)
 236                         devflags |= ISP1760_FLAG_ISP1761;
 237                 if (pdata->bus_width_16)
 238                         devflags |= ISP1760_FLAG_BUS_WIDTH_16;
 239                 if (pdata->port1_otg)
 240                         devflags |= ISP1760_FLAG_OTG_EN;
 241                 if (pdata->analog_oc)
 242                         devflags |= ISP1760_FLAG_ANALOG_OC;
 243                 if (pdata->dack_polarity_high)
 244                         devflags |= ISP1760_FLAG_DACK_POL_HIGH;
 245                 if (pdata->dreq_polarity_high)
 246                         devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
 247         }
 248
 249         ret = isp1760_register(mem_res, irq_res->start, irqflags, &pdev->dev,
 250                                devflags);
 251         if (ret < 0)
 252                 return ret;
 253
 254         pr_info("ISP1760 USB device initialised\n");
 255         return 0;
 256 }
 257
 258 static int isp1760_plat_remove(struct platform_device *pdev)
 259 {
 260         isp1760_unregister(&pdev->dev);
 261
 262         return 0;
 263 }
 264
 265 #ifdef CONFIG_OF
 266 static const struct of_device_id isp1760_of_match[] = {
 267         { .compatible = "nxp,usb-isp1760", },
 268         { .compatible = "nxp,usb-isp1761", },
 269         { },
 270 };
 271 MODULE_DEVICE_TABLE(of, isp1760_of_match);
 272 #endif
 273
 274 static struct platform_driver isp1760_plat_driver = {
 275         .probe  = isp1760_plat_probe,
 276         .remove = isp1760_plat_remove,
 277         .driver = {
 278                 .name   = "isp1760",
 279                 .of_match_table = of_match_ptr(isp1760_of_match),
 280         },
 281 };
 282
 283 static int __init isp1760_init(void)
 284 {
 285         int ret, any_ret = -ENODEV;
 286
 287         isp1760_init_kmem_once();
 288
 289         ret = platform_driver_register(&isp1760_plat_driver);
 290         if (!ret)
 291                 any_ret = 0;
 292 #ifdef CONFIG_PCI
 293         ret = pci_register_driver(&isp1761_pci_driver);
 294         if (!ret)
 295                 any_ret = 0;
 296 #endif
 297
 298         if (any_ret)
 299                 isp1760_deinit_kmem_cache();
 300         return any_ret;
 301 }
 302 module_init(isp1760_init);
 303
 304 static void __exit isp1760_exit(void)
 305 {
 306         platform_driver_unregister(&isp1760_plat_driver);
 307 #ifdef CONFIG_PCI
 308         pci_unregister_driver(&isp1761_pci_driver);
 309 #endif
 310         isp1760_deinit_kmem_cache();
 311 }
 312 module_exit(isp1760_exit);