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         .endpoint_reset         = ehci_endpoint_reset,
  65
  66         /*
  67          * scheduling support
  68          */
  69         .get_frame_number       = ehci_get_frame,
  70
  71         /*
  72          * root hub support
  73          */
  74         .hub_status_data        = ehci_hub_status_data,
  75         .hub_control            = ehci_hub_control,
  76 #ifdef  CONFIG_PM
  77         .bus_suspend            = ehci_bus_suspend,
  78         .bus_resume             = ehci_bus_resume,
  79 #endif
  80         .relinquish_port        = ehci_relinquish_port,
  81         .port_handed_over       = ehci_port_handed_over,
  82
  83         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  84 };
  85
  86
  87 /*
  88  * 440EPx Errata USBH_3
  89  * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
  90  */
  91 #define PPC440EPX_EHCI0_INSREG_BMT      (0x1 << 0)
  92 static int __devinit
  93 ppc44x_enable_bmt(struct device_node *dn)
  94 {
  95         __iomem u32 *insreg_virt;
  96
  97         insreg_virt = of_iomap(dn, 1);
  98         if (!insreg_virt)
  99                 return  -EINVAL;
 100
 101         out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT);
 102
 103         iounmap(insreg_virt);
 104         return 0;
 105 }
 106
 107
 108 static int __devinit
 109 ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match)
 110 {
 111         struct device_node *dn = op->node;
 112         struct usb_hcd *hcd;
 113         struct ehci_hcd *ehci = NULL;
 114         struct resource res;
 115         int irq;
 116         int rv;
 117
 118         struct device_node *np;
 119
 120         if (usb_disabled())
 121                 return -ENODEV;
 122
 123         dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
 124
 125         rv = of_address_to_resource(dn, 0, &res);
 126         if (rv)
 127                 return rv;
 128
 129         hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
 130         if (!hcd)
 131                 return -ENOMEM;
 132
 133         hcd->rsrc_start = res.start;
 134         hcd->rsrc_len = res.end - res.start + 1;
 135
 136         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 137                 printk(KERN_ERR __FILE__ ": request_mem_region failed\n");
 138                 rv = -EBUSY;
 139                 goto err_rmr;
 140         }
 141
 142         irq = irq_of_parse_and_map(dn, 0);
 143         if (irq == NO_IRQ) {
 144                 printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n");
 145                 rv = -EBUSY;
 146                 goto err_irq;
 147         }
 148
 149         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 150         if (!hcd->regs) {
 151                 printk(KERN_ERR __FILE__ ": ioremap failed\n");
 152                 rv = -ENOMEM;
 153                 goto err_ioremap;
 154         }
 155
 156         ehci = hcd_to_ehci(hcd);
 157         np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
 158         if (np != NULL) {
 159                 /* claim we really affected by usb23 erratum */
 160                 if (!of_address_to_resource(np, 0, &res))
 161                         ehci->ohci_hcctrl_reg = ioremap(res.start +
 162                                         OHCI_HCCTRL_OFFSET, OHCI_HCCTRL_LEN);
 163                 else
 164                         pr_debug(__FILE__ ": no ohci offset in fdt\n");
 165                 if (!ehci->ohci_hcctrl_reg) {
 166                         pr_debug(__FILE__ ": ioremap for ohci hcctrl failed\n");
 167                 } else {
 168                         ehci->has_amcc_usb23 = 1;
 169                 }
 170         }
 171
 172         if (of_get_property(dn, "big-endian", NULL)) {
 173                 ehci->big_endian_mmio = 1;
 174                 ehci->big_endian_desc = 1;
 175         }
 176         if (of_get_property(dn, "big-endian-regs", NULL))
 177                 ehci->big_endian_mmio = 1;
 178         if (of_get_property(dn, "big-endian-desc", NULL))
 179                 ehci->big_endian_desc = 1;
 180
 181         ehci->caps = hcd->regs;
 182         ehci->regs = hcd->regs +
 183                         HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
 184
 185         /* cache this readonly data; minimize chip reads */
 186         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 187
 188         if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) {
 189                 rv = ppc44x_enable_bmt(dn);
 190                 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n",
 191                                 rv ? "NOT ": "");
 192         }
 193
 194         rv = usb_add_hcd(hcd, irq, 0);
 195         if (rv == 0)
 196                 return 0;
 197
 198         iounmap(hcd->regs);
 199 err_ioremap:
 200         irq_dispose_mapping(irq);
 201 err_irq:
 202         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 203
 204         if (ehci->has_amcc_usb23)
 205                 iounmap(ehci->ohci_hcctrl_reg);
 206 err_rmr:
 207         usb_put_hcd(hcd);
 208
 209         return rv;
 210 }
 211
 212
 213 static int ehci_hcd_ppc_of_remove(struct of_device *op)
 214 {
 215         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 216         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 217
 218         struct device_node *np;
 219         struct resource res;
 220
 221         dev_set_drvdata(&op->dev, NULL);
 222
 223         dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
 224
 225         usb_remove_hcd(hcd);
 226
 227         iounmap(hcd->regs);
 228         irq_dispose_mapping(hcd->irq);
 229         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 230
 231         /* use request_mem_region to test if the ohci driver is loaded.  if so
 232          * ensure the ohci core is operational.
 233          */
 234         if (ehci->has_amcc_usb23) {
 235                 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
 236                 if (np != NULL) {
 237                         if (!of_address_to_resource(np, 0, &res))
 238                                 if (!request_mem_region(res.start,
 239                                                             0x4, hcd_name))
 240                                         set_ohci_hcfs(ehci, 1);
 241                                 else
 242                                         release_mem_region(res.start, 0x4);
 243                         else
 244                                 pr_debug(__FILE__ ": no ohci offset in fdt\n");
 245                         of_node_put(np);
 246                 }
 247
 248                 iounmap(ehci->ohci_hcctrl_reg);
 249         }
 250         usb_put_hcd(hcd);
 251
 252         return 0;
 253 }
 254
 255
 256 static int ehci_hcd_ppc_of_shutdown(struct of_device *op)
 257 {
 258         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 259
 260         if (hcd->driver->shutdown)
 261                 hcd->driver->shutdown(hcd);
 262
 263         return 0;
 264 }
 265
 266
 267 static struct of_device_id ehci_hcd_ppc_of_match[] = {
 268         {
 269                 .compatible = "usb-ehci",
 270         },
 271         {},
 272 };
 273 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
 274
 275
 276 static struct of_platform_driver ehci_hcd_ppc_of_driver = {
 277         .name           = "ppc-of-ehci",
 278         .match_table    = ehci_hcd_ppc_of_match,
 279         .probe          = ehci_hcd_ppc_of_probe,
 280         .remove         = ehci_hcd_ppc_of_remove,
 281         .shutdown       = ehci_hcd_ppc_of_shutdown,
 282         .driver         = {
 283                 .name   = "ppc-of-ehci",
 284                 .owner  = THIS_MODULE,
 285         },
 286 };