drivers/usb/host/ehci-grlib.c

   1 /*
   2  * Driver for Aeroflex Gaisler GRLIB GRUSBHC EHCI host controller
   3  *
   4  * GRUSBHC is typically found on LEON/GRLIB SoCs
   5  *
   6  * (c) Jan Andersson <jan@gaisler.com>
   7  *
   8  * Based on ehci-ppc-of.c which is:
   9  * (c) Valentine Barshak <vbarshak@ru.mvista.com>
  10  * and in turn based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de>
  11  * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com>
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the
  15  * Free Software Foundation; either version 2 of the License, or (at your
  16  * option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  20  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  21  * for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software Foundation,
  25  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28
  29 #include <linux/signal.h>
  30
  31 #include <linux/of_irq.h>
  32 #include <linux/of_address.h>
  33 #include <linux/of_platform.h>
  34
  35 #define GRUSBHC_HCIVERSION 0x0100 /* Known value of cap. reg. HCIVERSION */
  36
  37 /* called during probe() after chip reset completes */
  38 static int ehci_grlib_setup(struct usb_hcd *hcd)
  39 {
  40         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  41         int             retval;
  42
  43         retval = ehci_halt(ehci);
  44         if (retval)
  45                 return retval;
  46
  47         retval = ehci_init(hcd);
  48         if (retval)
  49                 return retval;
  50
  51         ehci->sbrn = 0x20;
  52         ehci_port_power(ehci, 1);
  53
  54         return ehci_reset(ehci);
  55 }
  56
  57
  58 static const struct hc_driver ehci_grlib_hc_driver = {
  59         .description            = hcd_name,
  60         .product_desc           = "GRLIB GRUSBHC EHCI",
  61         .hcd_priv_size          = sizeof(struct ehci_hcd),
  62
  63         /*
  64          * generic hardware linkage
  65          */
  66         .irq                    = ehci_irq,
  67         .flags                  = HCD_MEMORY | HCD_USB2,
  68
  69         /*
  70          * basic lifecycle operations
  71          */
  72         .reset                  = ehci_grlib_setup,
  73         .start                  = ehci_run,
  74         .stop                   = ehci_stop,
  75         .shutdown               = ehci_shutdown,
  76
  77         /*
  78          * managing i/o requests and associated device resources
  79          */
  80         .urb_enqueue            = ehci_urb_enqueue,
  81         .urb_dequeue            = ehci_urb_dequeue,
  82         .endpoint_disable       = ehci_endpoint_disable,
  83         .endpoint_reset         = ehci_endpoint_reset,
  84
  85         /*
  86          * scheduling support
  87          */
  88         .get_frame_number       = ehci_get_frame,
  89
  90         /*
  91          * root hub support
  92          */
  93         .hub_status_data        = ehci_hub_status_data,
  94         .hub_control            = ehci_hub_control,
  95 #ifdef  CONFIG_PM
  96         .bus_suspend            = ehci_bus_suspend,
  97         .bus_resume             = ehci_bus_resume,
  98 #endif
  99         .relinquish_port        = ehci_relinquish_port,
 100         .port_handed_over       = ehci_port_handed_over,
 101
 102         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
 103 };
 104
 105
 106 static int __devinit ehci_hcd_grlib_probe(struct platform_device *op)
 107 {
 108         struct device_node *dn = op->dev.of_node;
 109         struct usb_hcd *hcd;
 110         struct ehci_hcd *ehci = NULL;
 111         struct resource res;
 112         u32 hc_capbase;
 113         int irq;
 114         int rv;
 115
 116         if (usb_disabled())
 117                 return -ENODEV;
 118
 119         dev_dbg(&op->dev, "initializing GRUSBHC EHCI USB Controller\n");
 120
 121         rv = of_address_to_resource(dn, 0, &res);
 122         if (rv)
 123                 return rv;
 124
 125         /* usb_create_hcd requires dma_mask != NULL */
 126         op->dev.dma_mask = &op->dev.coherent_dma_mask;
 127         hcd = usb_create_hcd(&ehci_grlib_hc_driver, &op->dev,
 128                         "GRUSBHC EHCI USB");
 129         if (!hcd)
 130                 return -ENOMEM;
 131
 132         hcd->rsrc_start = res.start;
 133         hcd->rsrc_len = res.end - res.start + 1;
 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
 157         ehci->caps = hcd->regs;
 158
 159         /* determine endianness of this implementation */
 160         hc_capbase = ehci_readl(ehci, &ehci->caps->hc_capbase);
 161         if (HC_VERSION(ehci, hc_capbase) != GRUSBHC_HCIVERSION) {
 162                 ehci->big_endian_mmio = 1;
 163                 ehci->big_endian_desc = 1;
 164                 ehci->big_endian_capbase = 1;
 165         }
 166
 167         ehci->regs = hcd->regs +
 168                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 169
 170         /* cache this readonly data; minimize chip reads */
 171         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 172
 173         rv = usb_add_hcd(hcd, irq, 0);
 174         if (rv)
 175                 goto err_ehci;
 176
 177         return 0;
 178
 179 err_ehci:
 180         iounmap(hcd->regs);
 181 err_ioremap:
 182         irq_dispose_mapping(irq);
 183 err_irq:
 184         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 185 err_rmr:
 186         usb_put_hcd(hcd);
 187
 188         return rv;
 189 }
 190
 191
 192 static int ehci_hcd_grlib_remove(struct platform_device *op)
 193 {
 194         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 195
 196         dev_set_drvdata(&op->dev, NULL);
 197
 198         dev_dbg(&op->dev, "stopping GRLIB GRUSBHC EHCI USB Controller\n");
 199
 200         usb_remove_hcd(hcd);
 201
 202         iounmap(hcd->regs);
 203         irq_dispose_mapping(hcd->irq);
 204         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 205
 206         usb_put_hcd(hcd);
 207
 208         return 0;
 209 }
 210
 211
 212 static void ehci_hcd_grlib_shutdown(struct platform_device *op)
 213 {
 214         struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
 215
 216         if (hcd->driver->shutdown)
 217                 hcd->driver->shutdown(hcd);
 218 }
 219
 220
 221 static const struct of_device_id ehci_hcd_grlib_of_match[] = {
 222         {
 223                 .name = "GAISLER_EHCI",
 224          },
 225         {
 226                 .name = "01_026",
 227          },
 228         {},
 229 };
 230 MODULE_DEVICE_TABLE(of, ehci_hcd_grlib_of_match);
 231
 232
 233 static struct platform_driver ehci_grlib_driver = {
 234         .probe          = ehci_hcd_grlib_probe,
 235         .remove         = ehci_hcd_grlib_remove,
 236         .shutdown       = ehci_hcd_grlib_shutdown,
 237         .driver = {
 238                 .name = "grlib-ehci",
 239                 .owner = THIS_MODULE,
 240                 .of_match_table = ehci_hcd_grlib_of_match,
 241         },
 242 };