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