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/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-hcd.h"
  22
  23 #ifdef CONFIG_PCI
  24 #include <linux/pci.h>
  25 #endif
  26
  27 #ifdef CONFIG_PCI
  28 static int isp1761_pci_probe(struct pci_dev *dev,
  29                 const struct pci_device_id *id)
  30 {
  31         u8 latency, limit;
  32         __u32 reg_data;
  33         int retry_count;
  34         unsigned int devflags = 0;
  35         int ret_status = 0;
  36
  37         resource_size_t pci_mem_phy0;
  38         resource_size_t memlength;
  39
  40         u8 __iomem *chip_addr;
  41         u8 __iomem *iobase;
  42         resource_size_t nxp_pci_io_base;
  43         resource_size_t iolength;
  44
  45         if (usb_disabled())
  46                 return -ENODEV;
  47
  48         if (pci_enable_device(dev) < 0)
  49                 return -ENODEV;
  50
  51         if (!dev->irq)
  52                 return -ENODEV;
  53
  54         /* Grab the PLX PCI mem maped port start address we need  */
  55         nxp_pci_io_base = pci_resource_start(dev, 0);
  56         iolength = pci_resource_len(dev, 0);
  57
  58         if (!request_mem_region(nxp_pci_io_base, iolength, "ISP1761 IO MEM")) {
  59                 printk(KERN_ERR "request region #1\n");
  60                 return -EBUSY;
  61         }
  62
  63         iobase = ioremap_nocache(nxp_pci_io_base, iolength);
  64         if (!iobase) {
  65                 printk(KERN_ERR "ioremap #1\n");
  66                 ret_status = -ENOMEM;
  67                 goto cleanup1;
  68         }
  69         /* Grab the PLX PCI shared memory of the ISP 1761 we need  */
  70         pci_mem_phy0 = pci_resource_start(dev, 3);
  71         memlength = pci_resource_len(dev, 3);
  72         if (memlength < 0xffff) {
  73                 printk(KERN_ERR "memory length for this resource is wrong\n");
  74                 ret_status = -ENOMEM;
  75                 goto cleanup2;
  76         }
  77
  78         if (!request_mem_region(pci_mem_phy0, memlength, "ISP-PCI")) {
  79                 printk(KERN_ERR "host controller already in use\n");
  80                 ret_status = -EBUSY;
  81                 goto cleanup2;
  82         }
  83
  84         /* map available memory */
  85         chip_addr = ioremap_nocache(pci_mem_phy0,memlength);
  86         if (!chip_addr) {
  87                 printk(KERN_ERR "Error ioremap failed\n");
  88                 ret_status = -ENOMEM;
  89                 goto cleanup3;
  90         }
  91
  92         /* bad pci latencies can contribute to overruns */
  93         pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
  94         if (latency) {
  95                 pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
  96                 if (limit && limit < latency)
  97                         pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
  98         }
  99
 100         /* Try to check whether we can access Scratch Register of
 101          * Host Controller or not. The initial PCI access is retried until
 102          * local init for the PCI bridge is completed
 103          */
 104         retry_count = 20;
 105         reg_data = 0;
 106         while ((reg_data != 0xFACE) && retry_count) {
 107                 /*by default host is in 16bit mode, so
 108                  * io operations at this stage must be 16 bit
 109                  * */
 110                 writel(0xface, chip_addr + HC_SCRATCH_REG);
 111                 udelay(100);
 112                 reg_data = readl(chip_addr + HC_SCRATCH_REG) & 0x0000ffff;
 113                 retry_count--;
 114         }
 115
 116         iounmap(chip_addr);
 117
 118         /* Host Controller presence is detected by writing to scratch register
 119          * and reading back and checking the contents are same or not
 120          */
 121         if (reg_data != 0xFACE) {
 122                 dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data);
 123                 ret_status = -ENOMEM;
 124                 goto cleanup3;
 125         }
 126
 127         pci_set_master(dev);
 128
 129         /* configure PLX PCI chip to pass interrupts */
 130 #define PLX_INT_CSR_REG 0x68
 131         reg_data = readl(iobase + PLX_INT_CSR_REG);
 132         reg_data |= 0x900;
 133         writel(reg_data, iobase + PLX_INT_CSR_REG);
 134
 135         dev->dev.dma_mask = NULL;
 136         ret_status = isp1760_register(pci_mem_phy0, memlength, dev->irq,
 137                                       IRQF_SHARED, &dev->dev, devflags);
 138         if (ret_status < 0)
 139                 goto cleanup3;
 140
 141         /* done with PLX IO access */
 142         iounmap(iobase);
 143         release_mem_region(nxp_pci_io_base, iolength);
 144
 145         return 0;
 146
 147 cleanup3:
 148         release_mem_region(pci_mem_phy0, memlength);
 149 cleanup2:
 150         iounmap(iobase);
 151 cleanup1:
 152         release_mem_region(nxp_pci_io_base, iolength);
 153         return ret_status;
 154 }
 155
 156 static void isp1761_pci_remove(struct pci_dev *dev)
 157 {
 158         isp1760_unregister(&dev->dev);
 159
 160         pci_disable_device(dev);
 161 }
 162
 163 static void isp1761_pci_shutdown(struct pci_dev *dev)
 164 {
 165         printk(KERN_ERR "ips1761_pci_shutdown\n");
 166 }
 167
 168 static const struct pci_device_id isp1760_plx [] = {
 169         {
 170                 .class          = PCI_CLASS_BRIDGE_OTHER << 8,
 171                 .class_mask     = ~0,
 172                 .vendor         = PCI_VENDOR_ID_PLX,
 173                 .device         = 0x5406,
 174                 .subvendor      = PCI_VENDOR_ID_PLX,
 175                 .subdevice      = 0x9054,
 176         },
 177         { }
 178 };
 179 MODULE_DEVICE_TABLE(pci, isp1760_plx);
 180
 181 static struct pci_driver isp1761_pci_driver = {
 182         .name =         "isp1760",
 183         .id_table =     isp1760_plx,
 184         .probe =        isp1761_pci_probe,
 185         .remove =       isp1761_pci_remove,
 186         .shutdown =     isp1761_pci_shutdown,
 187 };
 188 #endif
 189
 190 static int isp1760_plat_probe(struct platform_device *pdev)
 191 {
 192         unsigned long irqflags = IRQF_SHARED;
 193         unsigned int devflags = 0;
 194         struct resource *mem_res;
 195         struct resource *irq_res;
 196         resource_size_t mem_size;
 197         int ret;
 198
 199         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 200         if (!mem_res) {
 201                 pr_warning("isp1760: Memory resource not available\n");
 202                 return -ENODEV;
 203         }
 204         mem_size = resource_size(mem_res);
 205         if (!request_mem_region(mem_res->start, mem_size, "isp1760")) {
 206                 pr_warning("isp1760: Cannot reserve the memory resource\n");
 207                 return -EBUSY;
 208         }
 209
 210         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 211         if (!irq_res) {
 212                 pr_warning("isp1760: IRQ resource not available\n");
 213                 ret = -ENODEV;
 214                 goto cleanup;
 215         }
 216
 217         irqflags |= irq_res->flags & IRQF_TRIGGER_MASK;
 218
 219         if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
 220                 struct device_node *dp = pdev->dev.of_node;
 221                 u32 bus_width = 0;
 222
 223                 if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
 224                         devflags |= ISP1760_FLAG_ISP1761;
 225
 226                 /* Some systems wire up only 16 of the 32 data lines */
 227                 of_property_read_u32(dp, "bus-width", &bus_width);
 228                 if (bus_width == 16)
 229                         devflags |= ISP1760_FLAG_BUS_WIDTH_16;
 230
 231                 if (of_property_read_bool(dp, "port1-otg"))
 232                         devflags |= ISP1760_FLAG_OTG_EN;
 233
 234                 if (of_property_read_bool(dp, "analog-oc"))
 235                         devflags |= ISP1760_FLAG_ANALOG_OC;
 236
 237                 if (of_property_read_bool(dp, "dack-polarity"))
 238                         devflags |= ISP1760_FLAG_DACK_POL_HIGH;
 239
 240                 if (of_property_read_bool(dp, "dreq-polarity"))
 241                         devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
 242         } else if (dev_get_platdata(&pdev->dev)) {
 243                 struct isp1760_platform_data *pdata =
 244                         dev_get_platdata(&pdev->dev);
 245
 246                 if (pdata->is_isp1761)
 247                         devflags |= ISP1760_FLAG_ISP1761;
 248                 if (pdata->bus_width_16)
 249                         devflags |= ISP1760_FLAG_BUS_WIDTH_16;
 250                 if (pdata->port1_otg)
 251                         devflags |= ISP1760_FLAG_OTG_EN;
 252                 if (pdata->analog_oc)
 253                         devflags |= ISP1760_FLAG_ANALOG_OC;
 254                 if (pdata->dack_polarity_high)
 255                         devflags |= ISP1760_FLAG_DACK_POL_HIGH;
 256                 if (pdata->dreq_polarity_high)
 257                         devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
 258         }
 259
 260         ret = isp1760_register(mem_res->start, mem_size, irq_res->start,
 261                                irqflags, &pdev->dev, devflags);
 262         if (ret < 0)
 263                 goto cleanup;
 264
 265         pr_info("ISP1760 USB device initialised\n");
 266         return 0;
 267
 268 cleanup:
 269         release_mem_region(mem_res->start, mem_size);
 270         return ret;
 271 }
 272
 273 static int isp1760_plat_remove(struct platform_device *pdev)
 274 {
 275         isp1760_unregister(&pdev->dev);
 276
 277         return 0;
 278 }
 279
 280 #ifdef CONFIG_OF
 281 static const struct of_device_id isp1760_of_match[] = {
 282         { .compatible = "nxp,usb-isp1760", },
 283         { .compatible = "nxp,usb-isp1761", },
 284         { },
 285 };
 286 MODULE_DEVICE_TABLE(of, isp1760_of_match);
 287 #endif
 288
 289 static struct platform_driver isp1760_plat_driver = {
 290         .probe  = isp1760_plat_probe,
 291         .remove = isp1760_plat_remove,
 292         .driver = {
 293                 .name   = "isp1760",
 294                 .of_match_table = of_match_ptr(isp1760_of_match),
 295         },
 296 };
 297
 298 static int __init isp1760_init(void)
 299 {
 300         int ret, any_ret = -ENODEV;
 301
 302         isp1760_init_kmem_once();
 303
 304         ret = platform_driver_register(&isp1760_plat_driver);
 305         if (!ret)
 306                 any_ret = 0;
 307 #ifdef CONFIG_PCI
 308         ret = pci_register_driver(&isp1761_pci_driver);
 309         if (!ret)
 310                 any_ret = 0;
 311 #endif
 312
 313         if (any_ret)
 314                 isp1760_deinit_kmem_cache();
 315         return any_ret;
 316 }
 317 module_init(isp1760_init);
 318
 319 static void __exit isp1760_exit(void)
 320 {
 321         platform_driver_unregister(&isp1760_plat_driver);
 322 #ifdef CONFIG_PCI
 323         pci_unregister_driver(&isp1761_pci_driver);
 324 #endif
 325         isp1760_deinit_kmem_cache();
 326 }
 327 module_exit(isp1760_exit);