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
  21 static const struct hc_driver ehci_ppc_of_hc_driver = {
  22         .description            = hcd_name,
  23         .product_desc           = "OF EHCI",
  24         .hcd_priv_size          = sizeof(struct ehci_hcd),
  25
  26         /*
  27          * generic hardware linkage
  28          */
  29         .irq                    = ehci_irq,
  30         .flags                  = HCD_MEMORY | HCD_USB2,
  31
  32         /*
  33          * basic lifecycle operations
  34          */
  35         .reset                  = ehci_setup,
  36         .start                  = ehci_run,
  37         .stop                   = ehci_stop,
  38         .shutdown               = ehci_shutdown,
  39
  40         /*
  41          * managing i/o requests and associated device resources
  42          */
  43         .urb_enqueue            = ehci_urb_enqueue,
  44         .urb_dequeue            = ehci_urb_dequeue,
  45         .endpoint_disable       = ehci_endpoint_disable,
  46         .endpoint_reset         = ehci_endpoint_reset,
  47
  48         /*
  49          * scheduling support
  50          */
  51         .get_frame_number       = ehci_get_frame,
  52
  53         /*
  54          * root hub support
  55          */
  56         .hub_status_data        = ehci_hub_status_data,
  57         .hub_control            = ehci_hub_control,
  58 #ifdef  CONFIG_PM
  59         .bus_suspend            = ehci_bus_suspend,
  60         .bus_resume             = ehci_bus_resume,
  61 #endif
  62         .relinquish_port        = ehci_relinquish_port,
  63         .port_handed_over       = ehci_port_handed_over,
  64
  65         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  66 };
  67
  68
  69 /*
  70  * 440EPx Errata USBH_3
  71  * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
  72  */
  73 #define PPC440EPX_EHCI0_INSREG_BMT      (0x1 << 0)
  74 static int __devinit
  75 ppc44x_enable_bmt(struct device_node *dn)
  76 {
  77         __iomem u32 *insreg_virt;
  78
  79         insreg_virt = of_iomap(dn, 1);
  80         if (!insreg_virt)
  81                 return  -EINVAL;
  82
  83         out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT);
  84
  85         iounmap(insreg_virt);
  86         return 0;
  87 }
  88
  89
  90 static int __devinit ehci_hcd_ppc_of_probe(struct platform_device *op)
  91 {
  92         struct device_node *dn = op->dev.of_node;
  93         struct usb_hcd *hcd;
  94         struct ehci_hcd *ehci = NULL;
  95         struct resource res;
  96         int irq;
  97         int rv;
  98
  99         struct device_node *np;
 100
 101         if (usb_disabled())
 102                 return -ENODEV;
 103
 104         dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
 105
 106         rv = of_address_to_resource(dn, 0, &res);
 107         if (rv)
 108                 return rv;
 109
 110         hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
 111         if (!hcd)
 112                 return -ENOMEM;
 113
 114         hcd->rsrc_start = res.start;
 115         hcd->rsrc_len = resource_size(&res);
 116
 117         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 118                 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
 119                 rv = -EBUSY;
 120                 goto err_rmr;
 121         }
 122
 123         irq = irq_of_parse_and_map(dn, 0);
 124         if (irq == NO_IRQ) {
 125                 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
 126                 rv = -EBUSY;
 127                 goto err_irq;
 128         }
 129
 130         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 131         if (!hcd->regs) {
 132                 printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
 133                 rv = -ENOMEM;
 134                 goto err_ioremap;
 135         }
 136
 137         ehci = hcd_to_ehci(hcd);
 138         np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
 139         if (np != NULL) {
 140                 /* claim we really affected by usb23 erratum */
 141                 if (!of_address_to_resource(np, 0, &res))
 142                         ehci->ohci_hcctrl_reg = ioremap(res.start +
 143                                         OHCI_HCCTRL_OFFSET, OHCI_HCCTRL_LEN);
 144                 else
 145                         pr_debug("%s: no ohci offset in fdt\n", __FILE__);
 146                 if (!ehci->ohci_hcctrl_reg) {
 147                         pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__);
 148                 } else {
 149                         ehci->has_amcc_usb23 = 1;
 150                 }
 151         }
 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
 164         if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) {
 165                 rv = ppc44x_enable_bmt(dn);
 166                 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n",
 167                                 rv ? "NOT ": "");
 168         }
 169
 170         rv = usb_add_hcd(hcd, irq, 0);
 171         if (rv)
 172                 goto err_ehci;
 173
 174         return 0;
 175
 176 err_ehci:
 177         if (ehci->has_amcc_usb23)
 178                 iounmap(ehci->ohci_hcctrl_reg);
 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 platform_device *op)
 192 {
 193         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 194         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 195
 196         struct device_node *np;
 197         struct resource res;
 198
 199         dev_set_drvdata(&op->dev, NULL);
 200
 201         dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
 202
 203         usb_remove_hcd(hcd);
 204
 205         iounmap(hcd->regs);
 206         irq_dispose_mapping(hcd->irq);
 207         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 208
 209         /* use request_mem_region to test if the ohci driver is loaded.  if so
 210          * ensure the ohci core is operational.
 211          */
 212         if (ehci->has_amcc_usb23) {
 213                 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
 214                 if (np != NULL) {
 215                         if (!of_address_to_resource(np, 0, &res))
 216                                 if (!request_mem_region(res.start,
 217                                                             0x4, hcd_name))
 218                                         set_ohci_hcfs(ehci, 1);
 219                                 else
 220                                         release_mem_region(res.start, 0x4);
 221                         else
 222                                 pr_debug("%s: no ohci offset in fdt\n", __FILE__);
 223                         of_node_put(np);
 224                 }
 225
 226                 iounmap(ehci->ohci_hcctrl_reg);
 227         }
 228         usb_put_hcd(hcd);
 229
 230         return 0;
 231 }
 232
 233
 234 static void ehci_hcd_ppc_of_shutdown(struct platform_device *op)
 235 {
 236         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 237
 238         if (hcd->driver->shutdown)
 239                 hcd->driver->shutdown(hcd);
 240 }
 241
 242
 243 static const struct of_device_id ehci_hcd_ppc_of_match[] = {
 244         {
 245                 .compatible = "usb-ehci",
 246         },
 247         {},
 248 };
 249 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
 250
 251
 252 static struct platform_driver ehci_hcd_ppc_of_driver = {
 253         .probe          = ehci_hcd_ppc_of_probe,
 254         .remove         = ehci_hcd_ppc_of_remove,
 255         .shutdown       = ehci_hcd_ppc_of_shutdown,
 256         .driver = {
 257                 .name = "ppc-of-ehci",
 258                 .owner = THIS_MODULE,
 259                 .of_match_table = ehci_hcd_ppc_of_match,
 260         },
 261 };