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 (!dev->irq)
 130                 return -ENODEV;
 131
 132         if (pci_enable_device(dev) < 0)
 133                 return -ENODEV;
 134
 135         ret = isp1761_pci_init(dev);
 136         if (ret < 0)
 137                 goto error;
 138
 139         pci_set_master(dev);
 140
 141         dev->dev.dma_mask = NULL;
 142         ret = isp1760_register(&dev->resource[3], dev->irq, 0, &dev->dev,
 143                                devflags);
 144         if (ret < 0)
 145                 goto error;
 146
 147         return 0;
 148
 149 error:
 150         pci_disable_device(dev);
 151         return ret;
 152 }
 153
 154 static void isp1761_pci_remove(struct pci_dev *dev)
 155 {
 156         isp1760_unregister(&dev->dev);
 157
 158         pci_disable_device(dev);
 159 }
 160
 161 static void isp1761_pci_shutdown(struct pci_dev *dev)
 162 {
 163         printk(KERN_ERR "ips1761_pci_shutdown\n");
 164 }
 165
 166 static const struct pci_device_id isp1760_plx [] = {
 167         {
 168                 .class          = PCI_CLASS_BRIDGE_OTHER << 8,
 169                 .class_mask     = ~0,
 170                 .vendor         = PCI_VENDOR_ID_PLX,
 171                 .device         = 0x5406,
 172                 .subvendor      = PCI_VENDOR_ID_PLX,
 173                 .subdevice      = 0x9054,
 174         },
 175         { }
 176 };
 177 MODULE_DEVICE_TABLE(pci, isp1760_plx);
 178
 179 static struct pci_driver isp1761_pci_driver = {
 180         .name =         "isp1760",
 181         .id_table =     isp1760_plx,
 182         .probe =        isp1761_pci_probe,
 183         .remove =       isp1761_pci_remove,
 184         .shutdown =     isp1761_pci_shutdown,
 185 };
 186 #endif
 187
 188 static int isp1760_plat_probe(struct platform_device *pdev)
 189 {
 190         unsigned long irqflags;
 191         unsigned int devflags = 0;
 192         struct resource *mem_res;
 193         struct resource *irq_res;
 194         int ret;
 195
 196         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 197
 198         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 199         if (!irq_res) {
 200                 pr_warning("isp1760: IRQ resource not available\n");
 201                 return -ENODEV;
 202         }
 203         irqflags = irq_res->flags & IRQF_TRIGGER_MASK;
 204
 205         if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
 206                 struct device_node *dp = pdev->dev.of_node;
 207                 u32 bus_width = 0;
 208
 209                 if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
 210                         devflags |= ISP1760_FLAG_ISP1761;
 211
 212                 /* Some systems wire up only 16 of the 32 data lines */
 213                 of_property_read_u32(dp, "bus-width", &bus_width);
 214                 if (bus_width == 16)
 215                         devflags |= ISP1760_FLAG_BUS_WIDTH_16;
 216
 217                 if (of_property_read_bool(dp, "port1-otg"))
 218                         devflags |= ISP1760_FLAG_OTG_EN;
 219
 220                 if (of_property_read_bool(dp, "analog-oc"))
 221                         devflags |= ISP1760_FLAG_ANALOG_OC;
 222
 223                 if (of_property_read_bool(dp, "dack-polarity"))
 224                         devflags |= ISP1760_FLAG_DACK_POL_HIGH;
 225
 226                 if (of_property_read_bool(dp, "dreq-polarity"))
 227                         devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
 228         } else if (dev_get_platdata(&pdev->dev)) {
 229                 struct isp1760_platform_data *pdata =
 230                         dev_get_platdata(&pdev->dev);
 231
 232                 if (pdata->is_isp1761)
 233                         devflags |= ISP1760_FLAG_ISP1761;
 234                 if (pdata->bus_width_16)
 235                         devflags |= ISP1760_FLAG_BUS_WIDTH_16;
 236                 if (pdata->port1_otg)
 237                         devflags |= ISP1760_FLAG_OTG_EN;
 238                 if (pdata->analog_oc)
 239                         devflags |= ISP1760_FLAG_ANALOG_OC;
 240                 if (pdata->dack_polarity_high)
 241                         devflags |= ISP1760_FLAG_DACK_POL_HIGH;
 242                 if (pdata->dreq_polarity_high)
 243                         devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
 244         }
 245
 246         ret = isp1760_register(mem_res, irq_res->start, irqflags, &pdev->dev,
 247                                devflags);
 248         if (ret < 0)
 249                 return ret;
 250
 251         pr_info("ISP1760 USB device initialised\n");
 252         return 0;
 253 }
 254
 255 static int isp1760_plat_remove(struct platform_device *pdev)
 256 {
 257         isp1760_unregister(&pdev->dev);
 258
 259         return 0;
 260 }
 261
 262 #ifdef CONFIG_OF
 263 static const struct of_device_id isp1760_of_match[] = {
 264         { .compatible = "nxp,usb-isp1760", },
 265         { .compatible = "nxp,usb-isp1761", },
 266         { },
 267 };
 268 MODULE_DEVICE_TABLE(of, isp1760_of_match);
 269 #endif
 270
 271 static struct platform_driver isp1760_plat_driver = {
 272         .probe  = isp1760_plat_probe,
 273         .remove = isp1760_plat_remove,
 274         .driver = {
 275                 .name   = "isp1760",
 276                 .of_match_table = of_match_ptr(isp1760_of_match),
 277         },
 278 };
 279
 280 static int __init isp1760_init(void)
 281 {
 282         int ret, any_ret = -ENODEV;
 283
 284         isp1760_init_kmem_once();
 285
 286         ret = platform_driver_register(&isp1760_plat_driver);
 287         if (!ret)
 288                 any_ret = 0;
 289 #ifdef CONFIG_PCI
 290         ret = pci_register_driver(&isp1761_pci_driver);
 291         if (!ret)
 292                 any_ret = 0;
 293 #endif
 294
 295         if (any_ret)
 296                 isp1760_deinit_kmem_cache();
 297         return any_ret;
 298 }
 299 module_init(isp1760_init);
 300
 301 static void __exit isp1760_exit(void)
 302 {
 303         platform_driver_unregister(&isp1760_plat_driver);
 304 #ifdef CONFIG_PCI
 305         pci_unregister_driver(&isp1761_pci_driver);
 306 #endif
 307         isp1760_deinit_kmem_cache();
 308 }
 309 module_exit(isp1760_exit);