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 };
  80
  81
  82 /*
  83  * 440EPx Errata USBH_3
  84  * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
  85  */
  86 #define PPC440EPX_EHCI0_INSREG_BMT      (0x1 << 0)
  87 static int __devinit
  88 ppc44x_enable_bmt(struct device_node *dn)
  89 {
  90         __iomem u32 *insreg_virt;
  91
  92         insreg_virt = of_iomap(dn, 1);
  93         if (!insreg_virt)
  94                 return  -EINVAL;
  95
  96         out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT);
  97
  98         iounmap(insreg_virt);
  99         return 0;
 100 }
 101
 102
 103 static int __devinit
 104 ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match)
 105 {
 106         struct device_node *dn = op->node;
 107         struct usb_hcd *hcd;
 108         struct ehci_hcd *ehci;
 109         struct resource res;
 110         int irq;
 111         int rv;
 112
 113         if (usb_disabled())
 114                 return -ENODEV;
 115
 116         dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
 117
 118         rv = of_address_to_resource(dn, 0, &res);
 119         if (rv)
 120                 return rv;
 121
 122         hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
 123         if (!hcd)
 124                 return -ENOMEM;
 125
 126         hcd->rsrc_start = res.start;
 127         hcd->rsrc_len = res.end - res.start + 1;
 128
 129         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 130                 printk(KERN_ERR __FILE__ ": request_mem_region failed\n");
 131                 rv = -EBUSY;
 132                 goto err_rmr;
 133         }
 134
 135         irq = irq_of_parse_and_map(dn, 0);
 136         if (irq == NO_IRQ) {
 137                 printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n");
 138                 rv = -EBUSY;
 139                 goto err_irq;
 140         }
 141
 142         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 143         if (!hcd->regs) {
 144                 printk(KERN_ERR __FILE__ ": ioremap failed\n");
 145                 rv = -ENOMEM;
 146                 goto err_ioremap;
 147         }
 148
 149         ehci = hcd_to_ehci(hcd);
 150
 151         if (of_get_property(dn, "big-endian", NULL)) {
 152                 ehci->big_endian_mmio = 1;
 153                 ehci->big_endian_desc = 1;
 154         }
 155         if (of_get_property(dn, "big-endian-regs", NULL))
 156                 ehci->big_endian_mmio = 1;
 157         if (of_get_property(dn, "big-endian-desc", NULL))
 158                 ehci->big_endian_desc = 1;
 159
 160         ehci->caps = hcd->regs;
 161         ehci->regs = hcd->regs +
 162                         HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
 163
 164         /* cache this readonly data; minimize chip reads */
 165         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 166
 167         if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) {
 168                 rv = ppc44x_enable_bmt(dn);
 169                 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n",
 170                                 rv ? "NOT ": "");
 171         }
 172
 173         rv = usb_add_hcd(hcd, irq, 0);
 174         if (rv == 0)
 175                 return 0;
 176
 177         iounmap(hcd->regs);
 178 err_ioremap:
 179         irq_dispose_mapping(irq);
 180 err_irq:
 181         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 182 err_rmr:
 183         usb_put_hcd(hcd);
 184
 185         return rv;
 186 }
 187
 188
 189 static int ehci_hcd_ppc_of_remove(struct of_device *op)
 190 {
 191         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 192         dev_set_drvdata(&op->dev, NULL);
 193
 194         dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
 195
 196         usb_remove_hcd(hcd);
 197
 198         iounmap(hcd->regs);
 199         irq_dispose_mapping(hcd->irq);
 200         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 201
 202         usb_put_hcd(hcd);
 203
 204         return 0;
 205 }
 206
 207
 208 static int ehci_hcd_ppc_of_shutdown(struct of_device *op)
 209 {
 210         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 211
 212         if (hcd->driver->shutdown)
 213                 hcd->driver->shutdown(hcd);
 214
 215         return 0;
 216 }
 217
 218
 219 static struct of_device_id ehci_hcd_ppc_of_match[] = {
 220         {
 221                 .compatible = "usb-ehci",
 222         },
 223         {},
 224 };
 225 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
 226
 227
 228 static struct of_platform_driver ehci_hcd_ppc_of_driver = {
 229         .name           = "ppc-of-ehci",
 230         .match_table    = ehci_hcd_ppc_of_match,
 231         .probe          = ehci_hcd_ppc_of_probe,
 232         .remove         = ehci_hcd_ppc_of_remove,
 233         .shutdown       = ehci_hcd_ppc_of_shutdown,
 234         .driver         = {
 235                 .name   = "ppc-of-ehci",
 236                 .owner  = THIS_MODULE,
 237         },
 238 };