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         .port_handed_over       = ehci_port_handed_over,
  81 };
  82
  83
  84 /*
  85  * 440EPx Errata USBH_3
  86  * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
  87  */
  88 #define PPC440EPX_EHCI0_INSREG_BMT      (0x1 << 0)
  89 static int __devinit
  90 ppc44x_enable_bmt(struct device_node *dn)
  91 {
  92         __iomem u32 *insreg_virt;
  93
  94         insreg_virt = of_iomap(dn, 1);
  95         if (!insreg_virt)
  96                 return  -EINVAL;
  97
  98         out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT);
  99
 100         iounmap(insreg_virt);
 101         return 0;
 102 }
 103
 104
 105 static int __devinit
 106 ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match)
 107 {
 108         struct device_node *dn = op->node;
 109         struct usb_hcd *hcd;
 110         struct ehci_hcd *ehci;
 111         struct resource res;
 112         int irq;
 113         int rv;
 114
 115         if (usb_disabled())
 116                 return -ENODEV;
 117
 118         dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
 119
 120         rv = of_address_to_resource(dn, 0, &res);
 121         if (rv)
 122                 return rv;
 123
 124         hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
 125         if (!hcd)
 126                 return -ENOMEM;
 127
 128         hcd->rsrc_start = res.start;
 129         hcd->rsrc_len = res.end - res.start + 1;
 130
 131         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 132                 printk(KERN_ERR __FILE__ ": request_mem_region failed\n");
 133                 rv = -EBUSY;
 134                 goto err_rmr;
 135         }
 136
 137         irq = irq_of_parse_and_map(dn, 0);
 138         if (irq == NO_IRQ) {
 139                 printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n");
 140                 rv = -EBUSY;
 141                 goto err_irq;
 142         }
 143
 144         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 145         if (!hcd->regs) {
 146                 printk(KERN_ERR __FILE__ ": ioremap failed\n");
 147                 rv = -ENOMEM;
 148                 goto err_ioremap;
 149         }
 150
 151         ehci = hcd_to_ehci(hcd);
 152
 153         if (of_get_property(dn, "big-endian", NULL)) {
 154                 ehci->big_endian_mmio = 1;
 155                 ehci->big_endian_desc = 1;
 156         }
 157         if (of_get_property(dn, "big-endian-regs", NULL))
 158                 ehci->big_endian_mmio = 1;
 159         if (of_get_property(dn, "big-endian-desc", NULL))
 160                 ehci->big_endian_desc = 1;
 161
 162         ehci->caps = hcd->regs;
 163         ehci->regs = hcd->regs +
 164                         HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
 165
 166         /* cache this readonly data; minimize chip reads */
 167         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 168
 169         if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) {
 170                 rv = ppc44x_enable_bmt(dn);
 171                 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n",
 172                                 rv ? "NOT ": "");
 173         }
 174
 175         rv = usb_add_hcd(hcd, irq, 0);
 176         if (rv == 0)
 177                 return 0;
 178
 179         iounmap(hcd->regs);
 180 err_ioremap:
 181         irq_dispose_mapping(irq);
 182 err_irq:
 183         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 184 err_rmr:
 185         usb_put_hcd(hcd);
 186
 187         return rv;
 188 }
 189
 190
 191 static int ehci_hcd_ppc_of_remove(struct of_device *op)
 192 {
 193         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 194         dev_set_drvdata(&op->dev, NULL);
 195
 196         dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
 197
 198         usb_remove_hcd(hcd);
 199
 200         iounmap(hcd->regs);
 201         irq_dispose_mapping(hcd->irq);
 202         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 203
 204         usb_put_hcd(hcd);
 205
 206         return 0;
 207 }
 208
 209
 210 static int ehci_hcd_ppc_of_shutdown(struct of_device *op)
 211 {
 212         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 213
 214         if (hcd->driver->shutdown)
 215                 hcd->driver->shutdown(hcd);
 216
 217         return 0;
 218 }
 219
 220
 221 static struct of_device_id ehci_hcd_ppc_of_match[] = {
 222         {
 223                 .compatible = "usb-ehci",
 224         },
 225         {},
 226 };
 227 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
 228
 229
 230 static struct of_platform_driver ehci_hcd_ppc_of_driver = {
 231         .name           = "ppc-of-ehci",
 232         .match_table    = ehci_hcd_ppc_of_match,
 233         .probe          = ehci_hcd_ppc_of_probe,
 234         .remove         = ehci_hcd_ppc_of_remove,
 235         .shutdown       = ehci_hcd_ppc_of_shutdown,
 236         .driver         = {
 237                 .name   = "ppc-of-ehci",
 238                 .owner  = THIS_MODULE,
 239         },
 240 };