err.no Git - linux-2.6/blob - drivers/usb/host/ehci-ppc-of.c

   1 /*
   2  * EHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * Bus Glue for PPC On-Chip EHCI driver on the of_platform bus
   5  * Tested on AMCC PPC 440EPx
   6  *
   7  * Valentine Barshak <vbarshak@ru.mvista.com>
   8  *
   9  * Based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de>
  10  * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com>
  11  *
  12  * This file is licenced under the GPL.
  13  */
  14
  15 #include <linux/signal.h>
  16
  17 #include <linux/of.h>
  18 #include <linux/of_platform.h>
  19
  20 /* called during probe() after chip reset completes */
  21 static int ehci_ppc_of_setup(struct usb_hcd *hcd)
  22 {
  23         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  24         int             retval;
  25
  26         retval = ehci_halt(ehci);
  27         if (retval)
  28                 return retval;
  29
  30         retval = ehci_init(hcd);
  31         if (retval)
  32                 return retval;
  33
  34         ehci->sbrn = 0x20;
  35         return ehci_reset(ehci);
  36 }
  37
  38
  39 static const struct hc_driver ehci_ppc_of_hc_driver = {
  40         .description            = hcd_name,
  41         .product_desc           = "OF EHCI",
  42         .hcd_priv_size          = sizeof(struct ehci_hcd),
  43
  44         /*
  45          * generic hardware linkage
  46          */
  47         .irq                    = ehci_irq,
  48         .flags                  = HCD_MEMORY | HCD_USB2,
  49
  50         /*
  51          * basic lifecycle operations
  52          */
  53         .reset                  = ehci_ppc_of_setup,
  54         .start                  = ehci_run,
  55         .stop                   = ehci_stop,
  56         .shutdown               = ehci_shutdown,
  57
  58         /*
  59          * managing i/o requests and associated device resources
  60          */
  61         .urb_enqueue            = ehci_urb_enqueue,
  62         .urb_dequeue            = ehci_urb_dequeue,
  63         .endpoint_disable       = ehci_endpoint_disable,
  64
  65         /*
  66          * scheduling support
  67          */
  68         .get_frame_number       = ehci_get_frame,
  69
  70         /*
  71          * root hub support
  72          */
  73         .hub_status_data        = ehci_hub_status_data,
  74         .hub_control            = ehci_hub_control,
  75 #ifdef  CONFIG_PM
  76         .bus_suspend            = ehci_bus_suspend,
  77         .bus_resume             = ehci_bus_resume,
  78 #endif
  79         .relinquish_port        = ehci_relinquish_port,
  80 };
  81
  82
  83 /*
  84  * 440EPx Errata USBH_3
  85  * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
  86  */
  87 #define PPC440EPX_EHCI0_INSREG_BMT      (0x1 << 0)
  88 static int __devinit
  89 ppc44x_enable_bmt(struct device_node *dn)
  90 {
  91         __iomem u32 *insreg_virt;
  92
  93         insreg_virt = of_iomap(dn, 1);
  94         if (!insreg_virt)
  95                 return  -EINVAL;
  96
  97         out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT);
  98
  99         iounmap(insreg_virt);
 100         return 0;
 101 }
 102
 103
 104 static int __devinit
 105 ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match)
 106 {
 107         struct device_node *dn = op->node;
 108         struct usb_hcd *hcd;
 109         struct ehci_hcd *ehci;
 110         struct resource res;
 111         int irq;
 112         int rv;
 113
 114         if (usb_disabled())
 115                 return -ENODEV;
 116
 117         dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
 118
 119         rv = of_address_to_resource(dn, 0, &res);
 120         if (rv)
 121                 return rv;
 122
 123         hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
 124         if (!hcd)
 125                 return -ENOMEM;
 126
 127         hcd->rsrc_start = res.start;
 128         hcd->rsrc_len = res.end - res.start + 1;
 129
 130         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 131                 printk(KERN_ERR __FILE__ ": request_mem_region failed\n");
 132                 rv = -EBUSY;
 133                 goto err_rmr;
 134         }
 135
 136         irq = irq_of_parse_and_map(dn, 0);
 137         if (irq == NO_IRQ) {
 138                 printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n");
 139                 rv = -EBUSY;
 140                 goto err_irq;
 141         }
 142
 143         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 144         if (!hcd->regs) {
 145                 printk(KERN_ERR __FILE__ ": ioremap failed\n");
 146                 rv = -ENOMEM;
 147                 goto err_ioremap;
 148         }
 149
 150         ehci = hcd_to_ehci(hcd);
 151
 152         if (of_get_property(dn, "big-endian", NULL)) {
 153                 ehci->big_endian_mmio = 1;
 154                 ehci->big_endian_desc = 1;
 155         }
 156         if (of_get_property(dn, "big-endian-regs", NULL))
 157                 ehci->big_endian_mmio = 1;
 158         if (of_get_property(dn, "big-endian-desc", NULL))
 159                 ehci->big_endian_desc = 1;
 160
 161         ehci->caps = hcd->regs;
 162         ehci->regs = hcd->regs +
 163                         HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
 164
 165         /* cache this readonly data; minimize chip reads */
 166         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 167
 168         if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) {
 169                 rv = ppc44x_enable_bmt(dn);
 170                 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n",
 171                                 rv ? "NOT ": "");
 172         }
 173
 174         rv = usb_add_hcd(hcd, irq, 0);
 175         if (rv == 0)
 176                 return 0;
 177
 178         iounmap(hcd->regs);
 179 err_ioremap:
 180         irq_dispose_mapping(irq);
 181 err_irq:
 182         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 183 err_rmr:
 184         usb_put_hcd(hcd);
 185
 186         return rv;
 187 }
 188
 189
 190 static int ehci_hcd_ppc_of_remove(struct of_device *op)
 191 {
 192         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 193         dev_set_drvdata(&op->dev, NULL);
 194
 195         dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
 196
 197         usb_remove_hcd(hcd);
 198
 199         iounmap(hcd->regs);
 200         irq_dispose_mapping(hcd->irq);
 201         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 202
 203         usb_put_hcd(hcd);
 204
 205         return 0;
 206 }
 207
 208
 209 static int ehci_hcd_ppc_of_shutdown(struct of_device *op)
 210 {
 211         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 212
 213         if (hcd->driver->shutdown)
 214                 hcd->driver->shutdown(hcd);
 215
 216         return 0;
 217 }
 218
 219
 220 static struct of_device_id ehci_hcd_ppc_of_match[] = {
 221         {
 222                 .compatible = "usb-ehci",
 223         },
 224         {},
 225 };
 226 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
 227
 228
 229 static struct of_platform_driver ehci_hcd_ppc_of_driver = {
 230         .name           = "ppc-of-ehci",
 231         .match_table    = ehci_hcd_ppc_of_match,
 232         .probe          = ehci_hcd_ppc_of_probe,
 233         .remove         = ehci_hcd_ppc_of_remove,
 234         .shutdown       = ehci_hcd_ppc_of_shutdown,
 235         .driver         = {
 236                 .name   = "ppc-of-ehci",
 237                 .owner  = THIS_MODULE,
 238         },
 239 };