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