drivers/usb/isp1760/isp1760-if.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Glue code for the ISP1760 driver and bus
   4  * Currently there is support for
   5  * - OpenFirmware
   6  * - PCI
   7  * - PDEV (generic platform device centralized driver model)
   8  *
   9  * (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
  10  *
  11  */
  12
  13 #include <linux/usb.h>
  14 #include <linux/io.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/slab.h>
  19 #include <linux/usb/isp1760.h>
  20 #include <linux/usb/hcd.h>
  21
  22 #include "isp1760-core.h"
  23 #include "isp1760-regs.h"
  24
  25 #ifdef CONFIG_USB_PCI
  26 #include <linux/pci.h>
  27 #endif
  28
  29 #ifdef CONFIG_USB_PCI
  30 static int isp1761_pci_init(struct pci_dev *dev)
  31 {
  32         resource_size_t mem_start;
  33         resource_size_t mem_length;
  34         u8 __iomem *iobase;
  35         u8 latency, limit;
  36         int retry_count;
  37         u32 reg_data;
  38
  39         /* Grab the PLX PCI shared memory of the ISP 1761 we need  */
  40         mem_start = pci_resource_start(dev, 3);
  41         mem_length = pci_resource_len(dev, 3);
  42         if (mem_length < 0xffff) {
  43                 printk(KERN_ERR "memory length for this resource is wrong\n");
  44                 return -ENOMEM;
  45         }
  46
  47         if (!request_mem_region(mem_start, mem_length, "ISP-PCI")) {
  48                 printk(KERN_ERR "host controller already in use\n");
  49                 return -EBUSY;
  50         }
  51
  52         /* map available memory */
  53         iobase = ioremap_nocache(mem_start, mem_length);
  54         if (!iobase) {
  55                 printk(KERN_ERR "Error ioremap failed\n");
  56                 release_mem_region(mem_start, mem_length);
  57                 return -ENOMEM;
  58         }
  59
  60         /* bad pci latencies can contribute to overruns */
  61         pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
  62         if (latency) {
  63                 pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
  64                 if (limit && limit < latency)
  65                         pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
  66         }
  67
  68         /* Try to check whether we can access Scratch Register of
  69          * Host Controller or not. The initial PCI access is retried until
  70          * local init for the PCI bridge is completed
  71          */
  72         retry_count = 20;
  73         reg_data = 0;
  74         while ((reg_data != 0xFACE) && retry_count) {
  75                 /*by default host is in 16bit mode, so
  76                  * io operations at this stage must be 16 bit
  77                  * */
  78                 writel(0xface, iobase + HC_SCRATCH_REG);
  79                 udelay(100);
  80                 reg_data = readl(iobase + HC_SCRATCH_REG) & 0x0000ffff;
  81                 retry_count--;
  82         }
  83
  84         iounmap(iobase);
  85         release_mem_region(mem_start, mem_length);
  86
  87         /* Host Controller presence is detected by writing to scratch register
  88          * and reading back and checking the contents are same or not
  89          */
  90         if (reg_data != 0xFACE) {
  91                 dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data);
  92                 return -ENOMEM;
  93         }
  94
  95         /* Grab the PLX PCI mem maped port start address we need  */
  96         mem_start = pci_resource_start(dev, 0);
  97         mem_length = pci_resource_len(dev, 0);
  98
  99         if (!request_mem_region(mem_start, mem_length, "ISP1761 IO MEM")) {
 100                 printk(KERN_ERR "request region #1\n");
 101                 return -EBUSY;
 102         }
 103
 104         iobase = ioremap_nocache(mem_start, mem_length);
 105         if (!iobase) {
 106                 printk(KERN_ERR "ioremap #1\n");
 107                 release_mem_region(mem_start, mem_length);
 108                 return -ENOMEM;
 109         }
 110
 111         /* configure PLX PCI chip to pass interrupts */
 112 #define PLX_INT_CSR_REG 0x68
 113         reg_data = readl(iobase + PLX_INT_CSR_REG);
 114         reg_data |= 0x900;
 115         writel(reg_data, iobase + PLX_INT_CSR_REG);
 116
 117         /* done with PLX IO access */
 118         iounmap(iobase);
 119         release_mem_region(mem_start, mem_length);
 120
 121         return 0;
 122 }
 123
 124 static int isp1761_pci_probe(struct pci_dev *dev,
 125                 const struct pci_device_id *id)
 126 {
 127         unsigned int devflags = 0;
 128         int ret;
 129
 130         if (!dev->irq)
 131                 return -ENODEV;
 132
 133         if (pci_enable_device(dev) < 0)
 134                 return -ENODEV;
 135
 136         ret = isp1761_pci_init(dev);
 137         if (ret < 0)
 138                 goto error;
 139
 140         pci_set_master(dev);
 141
 142         dev->dev.dma_mask = NULL;
 143         ret = isp1760_register(&dev->resource[3], dev->irq, 0, &dev->dev,
 144                                devflags);
 145         if (ret < 0)
 146                 goto error;
 147
 148         return 0;
 149
 150 error:
 151         pci_disable_device(dev);
 152         return ret;
 153 }
 154
 155 static void isp1761_pci_remove(struct pci_dev *dev)
 156 {
 157         isp1760_unregister(&dev->dev);
 158
 159         pci_disable_device(dev);
 160 }
 161
 162 static void isp1761_pci_shutdown(struct pci_dev *dev)
 163 {
 164         printk(KERN_ERR "ips1761_pci_shutdown\n");
 165 }
 166
 167 static const struct pci_device_id isp1760_plx[] = {
 168         {
 169                 .class          = PCI_CLASS_BRIDGE_OTHER << 8,
 170                 .class_mask     = ~0,
 171                 .vendor         = PCI_VENDOR_ID_PLX,
 172                 .device         = 0x5406,
 173                 .subvendor      = PCI_VENDOR_ID_PLX,
 174                 .subdevice      = 0x9054,
 175         },
 176         { }
 177 };
 178 MODULE_DEVICE_TABLE(pci, isp1760_plx);
 179
 180 static struct pci_driver isp1761_pci_driver = {
 181         .name =         "isp1760",
 182         .id_table =     isp1760_plx,
 183         .probe =        isp1761_pci_probe,
 184         .remove =       isp1761_pci_remove,
 185         .shutdown =     isp1761_pci_shutdown,
 186 };
 187 #endif
 188
 189 static int isp1760_plat_probe(struct platform_device *pdev)
 190 {
 191         unsigned long irqflags;
 192         unsigned int devflags = 0;
 193         struct resource *mem_res;
 194         struct resource *irq_res;
 195         int ret;
 196
 197         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 198
 199         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 200         if (!irq_res) {
 201                 pr_warn("isp1760: IRQ resource not available\n");
 202                 return -ENODEV;
 203         }
 204         irqflags = irq_res->flags & IRQF_TRIGGER_MASK;
 205
 206         if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
 207                 struct device_node *dp = pdev->dev.of_node;
 208                 u32 bus_width = 0;
 209
 210                 if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
 211                         devflags |= ISP1760_FLAG_ISP1761;
 212
 213                 /* Some systems wire up only 16 of the 32 data lines */
 214                 of_property_read_u32(dp, "bus-width", &bus_width);
 215                 if (bus_width == 16)
 216                         devflags |= ISP1760_FLAG_BUS_WIDTH_16;
 217
 218                 if (of_property_read_bool(dp, "port1-otg"))
 219                         devflags |= ISP1760_FLAG_OTG_EN;
 220
 221                 if (of_property_read_bool(dp, "analog-oc"))
 222                         devflags |= ISP1760_FLAG_ANALOG_OC;
 223
 224                 if (of_property_read_bool(dp, "dack-polarity"))
 225                         devflags |= ISP1760_FLAG_DACK_POL_HIGH;
 226
 227                 if (of_property_read_bool(dp, "dreq-polarity"))
 228                         devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
 229         } else if (dev_get_platdata(&pdev->dev)) {
 230                 struct isp1760_platform_data *pdata =
 231                         dev_get_platdata(&pdev->dev);
 232
 233                 if (pdata->is_isp1761)
 234                         devflags |= ISP1760_FLAG_ISP1761;
 235                 if (pdata->bus_width_16)
 236                         devflags |= ISP1760_FLAG_BUS_WIDTH_16;
 237                 if (pdata->port1_otg)
 238                         devflags |= ISP1760_FLAG_OTG_EN;
 239                 if (pdata->analog_oc)
 240                         devflags |= ISP1760_FLAG_ANALOG_OC;
 241                 if (pdata->dack_polarity_high)
 242                         devflags |= ISP1760_FLAG_DACK_POL_HIGH;
 243                 if (pdata->dreq_polarity_high)
 244                         devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
 245         }
 246
 247         ret = isp1760_register(mem_res, irq_res->start, irqflags, &pdev->dev,
 248                                devflags);
 249         if (ret < 0)
 250                 return ret;
 251
 252         pr_info("ISP1760 USB device initialised\n");
 253         return 0;
 254 }
 255
 256 static int isp1760_plat_remove(struct platform_device *pdev)
 257 {
 258         isp1760_unregister(&pdev->dev);
 259
 260         return 0;
 261 }
 262
 263 #ifdef CONFIG_OF
 264 static const struct of_device_id isp1760_of_match[] = {
 265         { .compatible = "nxp,usb-isp1760", },
 266         { .compatible = "nxp,usb-isp1761", },
 267         { },
 268 };
 269 MODULE_DEVICE_TABLE(of, isp1760_of_match);
 270 #endif
 271
 272 static struct platform_driver isp1760_plat_driver = {
 273         .probe  = isp1760_plat_probe,
 274         .remove = isp1760_plat_remove,
 275         .driver = {
 276                 .name   = "isp1760",
 277                 .of_match_table = of_match_ptr(isp1760_of_match),
 278         },
 279 };
 280
 281 static int __init isp1760_init(void)
 282 {
 283         int ret, any_ret = -ENODEV;
 284
 285         isp1760_init_kmem_once();
 286
 287         ret = platform_driver_register(&isp1760_plat_driver);
 288         if (!ret)
 289                 any_ret = 0;
 290 #ifdef CONFIG_USB_PCI
 291         ret = pci_register_driver(&isp1761_pci_driver);
 292         if (!ret)
 293                 any_ret = 0;
 294 #endif
 295
 296         if (any_ret)
 297                 isp1760_deinit_kmem_cache();
 298         return any_ret;
 299 }
 300 module_init(isp1760_init);
 301
 302 static void __exit isp1760_exit(void)
 303 {
 304         platform_driver_unregister(&isp1760_plat_driver);
 305 #ifdef CONFIG_USB_PCI
 306         pci_unregister_driver(&isp1761_pci_driver);
 307 #endif
 308         isp1760_deinit_kmem_cache();
 309 }
 310 module_exit(isp1760_exit);