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 ehci_hcd_ppc_of_probe(struct platform_device *op)
 109 {
 110         struct device_node *dn = op->dev.of_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 = resource_size(&res);
 134
 135         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 136                 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
 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 "%s: irq_of_parse_and_map failed\n", __FILE__);
 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 "%s: ioremap failed\n", __FILE__);
 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("%s: no ohci offset in fdt\n", __FILE__);
 164                 if (!ehci->ohci_hcctrl_reg) {
 165                         pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__);
 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, 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)
 195                 goto err_ehci;
 196
 197         return 0;
 198
 199 err_ehci:
 200         if (ehci->has_amcc_usb23)
 201                 iounmap(ehci->ohci_hcctrl_reg);
 202         iounmap(hcd->regs);
 203 err_ioremap:
 204         irq_dispose_mapping(irq);
 205 err_irq:
 206         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 207 err_rmr:
 208         usb_put_hcd(hcd);
 209
 210         return rv;
 211 }
 212
 213
 214 static int ehci_hcd_ppc_of_remove(struct platform_device *op)
 215 {
 216         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 217         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 218
 219         struct device_node *np;
 220         struct resource res;
 221
 222         dev_set_drvdata(&op->dev, NULL);
 223
 224         dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
 225
 226         usb_remove_hcd(hcd);
 227
 228         iounmap(hcd->regs);
 229         irq_dispose_mapping(hcd->irq);
 230         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 231
 232         /* use request_mem_region to test if the ohci driver is loaded.  if so
 233          * ensure the ohci core is operational.
 234          */
 235         if (ehci->has_amcc_usb23) {
 236                 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
 237                 if (np != NULL) {
 238                         if (!of_address_to_resource(np, 0, &res))
 239                                 if (!request_mem_region(res.start,
 240                                                             0x4, hcd_name))
 241                                         set_ohci_hcfs(ehci, 1);
 242                                 else
 243                                         release_mem_region(res.start, 0x4);
 244                         else
 245                                 pr_debug("%s: no ohci offset in fdt\n", __FILE__);
 246                         of_node_put(np);
 247                 }
 248
 249                 iounmap(ehci->ohci_hcctrl_reg);
 250         }
 251         usb_put_hcd(hcd);
 252
 253         return 0;
 254 }
 255
 256
 257 static void ehci_hcd_ppc_of_shutdown(struct platform_device *op)
 258 {
 259         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 260
 261         if (hcd->driver->shutdown)
 262                 hcd->driver->shutdown(hcd);
 263 }
 264
 265
 266 static const 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 platform_driver ehci_hcd_ppc_of_driver = {
 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                 .of_match_table = ehci_hcd_ppc_of_match,
 283         },
 284 };