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/err.h>
  16 #include <linux/signal.h>
  17
  18 #include <linux/of.h>
  19 #include <linux/of_address.h>
  20 #include <linux/of_irq.h>
  21 #include <linux/of_platform.h>
  22
  23
  24 static const struct hc_driver ehci_ppc_of_hc_driver = {
  25         .description            = hcd_name,
  26         .product_desc           = "OF EHCI",
  27         .hcd_priv_size          = sizeof(struct ehci_hcd),
  28
  29         /*
  30          * generic hardware linkage
  31          */
  32         .irq                    = ehci_irq,
  33         .flags                  = HCD_MEMORY | HCD_USB2 | HCD_BH,
  34
  35         /*
  36          * basic lifecycle operations
  37          */
  38         .reset                  = ehci_setup,
  39         .start                  = ehci_run,
  40         .stop                   = ehci_stop,
  41         .shutdown               = ehci_shutdown,
  42
  43         /*
  44          * managing i/o requests and associated device resources
  45          */
  46         .urb_enqueue            = ehci_urb_enqueue,
  47         .urb_dequeue            = ehci_urb_dequeue,
  48         .endpoint_disable       = ehci_endpoint_disable,
  49         .endpoint_reset         = ehci_endpoint_reset,
  50
  51         /*
  52          * scheduling support
  53          */
  54         .get_frame_number       = ehci_get_frame,
  55
  56         /*
  57          * root hub support
  58          */
  59         .hub_status_data        = ehci_hub_status_data,
  60         .hub_control            = ehci_hub_control,
  61 #ifdef  CONFIG_PM
  62         .bus_suspend            = ehci_bus_suspend,
  63         .bus_resume             = ehci_bus_resume,
  64 #endif
  65         .relinquish_port        = ehci_relinquish_port,
  66         .port_handed_over       = ehci_port_handed_over,
  67
  68         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  69 };
  70
  71
  72 /*
  73  * 440EPx Errata USBH_3
  74  * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
  75  */
  76 #define PPC440EPX_EHCI0_INSREG_BMT      (0x1 << 0)
  77 static int
  78 ppc44x_enable_bmt(struct device_node *dn)
  79 {
  80         __iomem u32 *insreg_virt;
  81
  82         insreg_virt = of_iomap(dn, 1);
  83         if (!insreg_virt)
  84                 return  -EINVAL;
  85
  86         out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT);
  87
  88         iounmap(insreg_virt);
  89         return 0;
  90 }
  91
  92
  93 static int ehci_hcd_ppc_of_probe(struct platform_device *op)
  94 {
  95         struct device_node *dn = op->dev.of_node;
  96         struct usb_hcd *hcd;
  97         struct ehci_hcd *ehci = NULL;
  98         struct resource res;
  99         int irq;
 100         int rv;
 101
 102         struct device_node *np;
 103
 104         if (usb_disabled())
 105                 return -ENODEV;
 106
 107         dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
 108
 109         rv = of_address_to_resource(dn, 0, &res);
 110         if (rv)
 111                 return rv;
 112
 113         hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
 114         if (!hcd)
 115                 return -ENOMEM;
 116
 117         hcd->rsrc_start = res.start;
 118         hcd->rsrc_len = resource_size(&res);
 119
 120         irq = irq_of_parse_and_map(dn, 0);
 121         if (irq == NO_IRQ) {
 122                 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
 123                 rv = -EBUSY;
 124                 goto err_irq;
 125         }
 126
 127         hcd->regs = devm_ioremap_resource(&op->dev, &res);
 128         if (IS_ERR(hcd->regs)) {
 129                 rv = PTR_ERR(hcd->regs);
 130                 goto err_ioremap;
 131         }
 132
 133         ehci = hcd_to_ehci(hcd);
 134         np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
 135         if (np != NULL) {
 136                 /* claim we really affected by usb23 erratum */
 137                 if (!of_address_to_resource(np, 0, &res))
 138                         ehci->ohci_hcctrl_reg =
 139                                 devm_ioremap(&op->dev,
 140                                              res.start + OHCI_HCCTRL_OFFSET,
 141                                              OHCI_HCCTRL_LEN);
 142                 else
 143                         pr_debug("%s: no ohci offset in fdt\n", __FILE__);
 144                 if (!ehci->ohci_hcctrl_reg) {
 145                         pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__);
 146                 } else {
 147                         ehci->has_amcc_usb23 = 1;
 148                 }
 149         }
 150
 151         if (of_get_property(dn, "big-endian", NULL)) {
 152                 ehci->big_endian_mmio = 1;
 153                 ehci->big_endian_desc = 1;
 154         }
 155         if (of_get_property(dn, "big-endian-regs", NULL))
 156                 ehci->big_endian_mmio = 1;
 157         if (of_get_property(dn, "big-endian-desc", NULL))
 158                 ehci->big_endian_desc = 1;
 159
 160         ehci->caps = hcd->regs;
 161
 162         if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) {
 163                 rv = ppc44x_enable_bmt(dn);
 164                 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n",
 165                                 rv ? "NOT ": "");
 166         }
 167
 168         rv = usb_add_hcd(hcd, irq, 0);
 169         if (rv)
 170                 goto err_ioremap;
 171
 172         return 0;
 173
 174 err_ioremap:
 175         irq_dispose_mapping(irq);
 176 err_irq:
 177         usb_put_hcd(hcd);
 178
 179         return rv;
 180 }
 181
 182
 183 static int ehci_hcd_ppc_of_remove(struct platform_device *op)
 184 {
 185         struct usb_hcd *hcd = platform_get_drvdata(op);
 186         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 187
 188         struct device_node *np;
 189         struct resource res;
 190
 191         dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
 192
 193         usb_remove_hcd(hcd);
 194
 195         irq_dispose_mapping(hcd->irq);
 196
 197         /* use request_mem_region to test if the ohci driver is loaded.  if so
 198          * ensure the ohci core is operational.
 199          */
 200         if (ehci->has_amcc_usb23) {
 201                 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
 202                 if (np != NULL) {
 203                         if (!of_address_to_resource(np, 0, &res))
 204                                 if (!request_mem_region(res.start,
 205                                                             0x4, hcd_name))
 206                                         set_ohci_hcfs(ehci, 1);
 207                                 else
 208                                         release_mem_region(res.start, 0x4);
 209                         else
 210                                 pr_debug("%s: no ohci offset in fdt\n", __FILE__);
 211                         of_node_put(np);
 212                 }
 213         }
 214         usb_put_hcd(hcd);
 215
 216         return 0;
 217 }
 218
 219
 220 static const struct of_device_id ehci_hcd_ppc_of_match[] = {
 221         {
 222                 .compatible = "usb-ehci",
 223         },
 224         {},
 225 };
 226 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
 227
 228
 229 static struct platform_driver ehci_hcd_ppc_of_driver = {
 230         .probe          = ehci_hcd_ppc_of_probe,
 231         .remove         = ehci_hcd_ppc_of_remove,
 232         .shutdown       = usb_hcd_platform_shutdown,
 233         .driver = {
 234                 .name = "ppc-of-ehci",
 235                 .owner = THIS_MODULE,
 236                 .of_match_table = ehci_hcd_ppc_of_match,
 237         },
 238 };