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