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