drivers/usb/host/uhci-grlib.c

   1 /*
   2  * UHCI HCD (Host Controller Driver) for GRLIB GRUSBHC
   3  *
   4  * Copyright (c) 2011 Jan Andersson <jan@gaisler.com>
   5  *
   6  * This file is based on UHCI PCI HCD:
   7  * (C) Copyright 1999 Linus Torvalds
   8  * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
   9  * (C) Copyright 1999 Randy Dunlap
  10  * (C) Copyright 1999 Georg Acher, acher@in.tum.de
  11  * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
  12  * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
  13  * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
  14  * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
  15  *               support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
  16  * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
  17  * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
  18  */
  19
  20 #include <linux/of_irq.h>
  21 #include <linux/of_address.h>
  22 #include <linux/of_platform.h>
  23
  24 static int uhci_grlib_init(struct usb_hcd *hcd)
  25 {
  26         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
  27
  28         /*
  29          * Probe to determine the endianness of the controller.
  30          * We know that bit 7 of the PORTSC1 register is always set
  31          * and bit 15 is always clear.  If uhci_readw() yields a value
  32          * with bit 7 (0x80) turned on then the current little-endian
  33          * setting is correct.  Otherwise we assume the value was
  34          * byte-swapped; hence the register interface and presumably
  35          * also the descriptors are big-endian.
  36          */
  37         if (!(uhci_readw(uhci, USBPORTSC1) & 0x80)) {
  38                 uhci->big_endian_mmio = 1;
  39                 uhci->big_endian_desc = 1;
  40         }
  41
  42         uhci->rh_numports = uhci_count_ports(hcd);
  43
  44         /* Set up pointers to to generic functions */
  45         uhci->reset_hc = uhci_generic_reset_hc;
  46         uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc;
  47         /* No special actions need to be taken for the functions below */
  48         uhci->configure_hc = NULL;
  49         uhci->resume_detect_interrupts_are_broken = NULL;
  50         uhci->global_suspend_mode_is_broken = NULL;
  51
  52         /* Reset if the controller isn't already safely quiescent. */
  53         check_and_reset_hc(uhci);
  54         return 0;
  55 }
  56
  57 static const struct hc_driver uhci_grlib_hc_driver = {
  58         .description =          hcd_name,
  59         .product_desc =         "GRLIB GRUSBHC UHCI Host Controller",
  60         .hcd_priv_size =        sizeof(struct uhci_hcd),
  61
  62         /* Generic hardware linkage */
  63         .irq =                  uhci_irq,
  64         .flags =                HCD_MEMORY | HCD_USB11,
  65
  66         /* Basic lifecycle operations */
  67         .reset =                uhci_grlib_init,
  68         .start =                uhci_start,
  69 #ifdef CONFIG_PM
  70         .pci_suspend =          NULL,
  71         .pci_resume =           NULL,
  72         .bus_suspend =          uhci_rh_suspend,
  73         .bus_resume =           uhci_rh_resume,
  74 #endif
  75         .stop =                 uhci_stop,
  76
  77         .urb_enqueue =          uhci_urb_enqueue,
  78         .urb_dequeue =          uhci_urb_dequeue,
  79
  80         .endpoint_disable =     uhci_hcd_endpoint_disable,
  81         .get_frame_number =     uhci_hcd_get_frame_number,
  82
  83         .hub_status_data =      uhci_hub_status_data,
  84         .hub_control =          uhci_hub_control,
  85 };
  86
  87
  88 static int uhci_hcd_grlib_probe(struct platform_device *op)
  89 {
  90         struct device_node *dn = op->dev.of_node;
  91         struct usb_hcd *hcd;
  92         struct uhci_hcd *uhci = NULL;
  93         struct resource res;
  94         int irq;
  95         int rv;
  96
  97         if (usb_disabled())
  98                 return -ENODEV;
  99
 100         dev_dbg(&op->dev, "initializing GRUSBHC UHCI USB Controller\n");
 101
 102         rv = of_address_to_resource(dn, 0, &res);
 103         if (rv)
 104                 return rv;
 105
 106         /* usb_create_hcd requires dma_mask != NULL */
 107         op->dev.dma_mask = &op->dev.coherent_dma_mask;
 108         hcd = usb_create_hcd(&uhci_grlib_hc_driver, &op->dev,
 109                         "GRUSBHC UHCI USB");
 110         if (!hcd)
 111                 return -ENOMEM;
 112
 113         hcd->rsrc_start = res.start;
 114         hcd->rsrc_len = resource_size(&res);
 115
 116         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 117                 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
 118                 rv = -EBUSY;
 119                 goto err_rmr;
 120         }
 121
 122         irq = irq_of_parse_and_map(dn, 0);
 123         if (irq == NO_IRQ) {
 124                 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
 125                 rv = -EBUSY;
 126                 goto err_irq;
 127         }
 128
 129         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 130         if (!hcd->regs) {
 131                 printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
 132                 rv = -ENOMEM;
 133                 goto err_ioremap;
 134         }
 135
 136         uhci = hcd_to_uhci(hcd);
 137
 138         uhci->regs = hcd->regs;
 139
 140         rv = usb_add_hcd(hcd, irq, 0);
 141         if (rv)
 142                 goto err_uhci;
 143
 144         return 0;
 145
 146 err_uhci:
 147         iounmap(hcd->regs);
 148 err_ioremap:
 149         irq_dispose_mapping(irq);
 150 err_irq:
 151         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 152 err_rmr:
 153         usb_put_hcd(hcd);
 154
 155         return rv;
 156 }
 157
 158 static int uhci_hcd_grlib_remove(struct platform_device *op)
 159 {
 160         struct usb_hcd *hcd = platform_get_drvdata(op);
 161
 162         dev_dbg(&op->dev, "stopping GRLIB GRUSBHC UHCI USB Controller\n");
 163
 164         usb_remove_hcd(hcd);
 165
 166         iounmap(hcd->regs);
 167         irq_dispose_mapping(hcd->irq);
 168         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 169
 170         usb_put_hcd(hcd);
 171
 172         return 0;
 173 }
 174
 175 /* Make sure the controller is quiescent and that we're not using it
 176  * any more.  This is mainly for the benefit of programs which, like kexec,
 177  * expect the hardware to be idle: not doing DMA or generating IRQs.
 178  *
 179  * This routine may be called in a damaged or failing kernel.  Hence we
 180  * do not acquire the spinlock before shutting down the controller.
 181  */
 182 static void uhci_hcd_grlib_shutdown(struct platform_device *op)
 183 {
 184         struct usb_hcd *hcd = platform_get_drvdata(op);
 185
 186         uhci_hc_died(hcd_to_uhci(hcd));
 187 }
 188
 189 static const struct of_device_id uhci_hcd_grlib_of_match[] = {
 190         { .name = "GAISLER_UHCI", },
 191         { .name = "01_027", },
 192         {},
 193 };
 194 MODULE_DEVICE_TABLE(of, uhci_hcd_grlib_of_match);
 195
 196
 197 static struct platform_driver uhci_grlib_driver = {
 198         .probe          = uhci_hcd_grlib_probe,
 199         .remove         = uhci_hcd_grlib_remove,
 200         .shutdown       = uhci_hcd_grlib_shutdown,
 201         .driver = {
 202                 .name = "grlib-uhci",
 203                 .owner = THIS_MODULE,
 204                 .of_match_table = uhci_hcd_grlib_of_match,
 205         },
 206 };