drivers/usb/host/ohci-jz4740.c

   1 /*
   2  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify it
   5  *  under  the terms of the GNU General  Public License as published by the
   6  *  Free Software Foundation;  either version 2 of the License, or (at your
   7  *  option) any later version.
   8  *
   9  *  You should have received a copy of the  GNU General Public License along
  10  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  11  *  675 Mass Ave, Cambridge, MA 02139, USA.
  12  *
  13  */
  14
  15 #include <linux/platform_device.h>
  16 #include <linux/clk.h>
  17 #include <linux/regulator/consumer.h>
  18
  19 struct jz4740_ohci_hcd {
  20         struct ohci_hcd ohci_hcd;
  21
  22         struct regulator *vbus;
  23         bool vbus_enabled;
  24         struct clk *clk;
  25 };
  26
  27 static inline struct jz4740_ohci_hcd *hcd_to_jz4740_hcd(struct usb_hcd *hcd)
  28 {
  29         return (struct jz4740_ohci_hcd *)(hcd->hcd_priv);
  30 }
  31
  32 static inline struct usb_hcd *jz4740_hcd_to_hcd(struct jz4740_ohci_hcd *jz4740_ohci)
  33 {
  34         return container_of((void *)jz4740_ohci, struct usb_hcd, hcd_priv);
  35 }
  36
  37 static int ohci_jz4740_start(struct usb_hcd *hcd)
  38 {
  39         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  40         int     ret;
  41
  42         ret = ohci_init(ohci);
  43         if (ret < 0)
  44                 return ret;
  45
  46         ohci->num_ports = 1;
  47
  48         ret = ohci_run(ohci);
  49         if (ret < 0) {
  50                 dev_err(hcd->self.controller, "Can not start %s",
  51                         hcd->self.bus_name);
  52                 ohci_stop(hcd);
  53                 return ret;
  54         }
  55         return 0;
  56 }
  57
  58 static int ohci_jz4740_set_vbus_power(struct jz4740_ohci_hcd *jz4740_ohci,
  59         bool enabled)
  60 {
  61         int ret = 0;
  62
  63         if (!jz4740_ohci->vbus)
  64                 return 0;
  65
  66         if (enabled && !jz4740_ohci->vbus_enabled) {
  67                 ret = regulator_enable(jz4740_ohci->vbus);
  68                 if (ret)
  69                         dev_err(jz4740_hcd_to_hcd(jz4740_ohci)->self.controller,
  70                                 "Could not power vbus\n");
  71         } else if (!enabled && jz4740_ohci->vbus_enabled) {
  72                 ret = regulator_disable(jz4740_ohci->vbus);
  73         }
  74
  75         if (ret == 0)
  76                 jz4740_ohci->vbus_enabled = enabled;
  77
  78         return ret;
  79 }
  80
  81 static int ohci_jz4740_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
  82         u16 wIndex, char *buf, u16 wLength)
  83 {
  84         struct jz4740_ohci_hcd *jz4740_ohci = hcd_to_jz4740_hcd(hcd);
  85         int ret;
  86
  87         switch (typeReq) {
  88         case SetHubFeature:
  89                 if (wValue == USB_PORT_FEAT_POWER)
  90                         ret = ohci_jz4740_set_vbus_power(jz4740_ohci, true);
  91                 break;
  92         case ClearHubFeature:
  93                 if (wValue == USB_PORT_FEAT_POWER)
  94                         ret = ohci_jz4740_set_vbus_power(jz4740_ohci, false);
  95                 break;
  96         }
  97
  98         if (ret)
  99                 return ret;
 100
 101         return ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
 102 }
 103
 104
 105 static const struct hc_driver ohci_jz4740_hc_driver = {
 106         .description =          hcd_name,
 107         .product_desc =         "JZ4740 OHCI",
 108         .hcd_priv_size =        sizeof(struct jz4740_ohci_hcd),
 109
 110         /*
 111          * generic hardware linkage
 112          */
 113         .irq =                  ohci_irq,
 114         .flags =                HCD_USB11 | HCD_MEMORY,
 115
 116         /*
 117          * basic lifecycle operations
 118          */
 119         .start =                ohci_jz4740_start,
 120         .stop =                 ohci_stop,
 121         .shutdown =             ohci_shutdown,
 122
 123         /*
 124          * managing i/o requests and associated device resources
 125          */
 126         .urb_enqueue =          ohci_urb_enqueue,
 127         .urb_dequeue =          ohci_urb_dequeue,
 128         .endpoint_disable =     ohci_endpoint_disable,
 129
 130         /*
 131          * scheduling support
 132          */
 133         .get_frame_number =     ohci_get_frame,
 134
 135         /*
 136          * root hub support
 137          */
 138         .hub_status_data =      ohci_hub_status_data,
 139         .hub_control =          ohci_jz4740_hub_control,
 140 #ifdef  CONFIG_PM
 141         .bus_suspend =          ohci_bus_suspend,
 142         .bus_resume =           ohci_bus_resume,
 143 #endif
 144         .start_port_reset =     ohci_start_port_reset,
 145 };
 146
 147
 148 static int jz4740_ohci_probe(struct platform_device *pdev)
 149 {
 150         int ret;
 151         struct usb_hcd *hcd;
 152         struct jz4740_ohci_hcd *jz4740_ohci;
 153         struct resource *res;
 154         int irq;
 155
 156         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 157
 158         if (!res) {
 159                 dev_err(&pdev->dev, "Failed to get platform resource\n");
 160                 return -ENOENT;
 161         }
 162
 163         irq = platform_get_irq(pdev, 0);
 164         if (irq < 0) {
 165                 dev_err(&pdev->dev, "Failed to get platform irq\n");
 166                 return irq;
 167         }
 168
 169         hcd = usb_create_hcd(&ohci_jz4740_hc_driver, &pdev->dev, "jz4740");
 170         if (!hcd) {
 171                 dev_err(&pdev->dev, "Failed to create hcd.\n");
 172                 return -ENOMEM;
 173         }
 174
 175         jz4740_ohci = hcd_to_jz4740_hcd(hcd);
 176
 177         res = request_mem_region(res->start, resource_size(res), hcd_name);
 178         if (!res) {
 179                 dev_err(&pdev->dev, "Failed to request mem region.\n");
 180                 ret = -EBUSY;
 181                 goto err_free;
 182         }
 183
 184         hcd->rsrc_start = res->start;
 185         hcd->rsrc_len = resource_size(res);
 186         hcd->regs = ioremap(res->start, resource_size(res));
 187
 188         if (!hcd->regs) {
 189                 dev_err(&pdev->dev, "Failed to ioremap registers.\n");
 190                 ret = -EBUSY;
 191                 goto err_release_mem;
 192         }
 193
 194         jz4740_ohci->clk = clk_get(&pdev->dev, "uhc");
 195         if (IS_ERR(jz4740_ohci->clk)) {
 196                 ret = PTR_ERR(jz4740_ohci->clk);
 197                 dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
 198                 goto err_iounmap;
 199         }
 200
 201         jz4740_ohci->vbus = regulator_get(&pdev->dev, "vbus");
 202         if (IS_ERR(jz4740_ohci->vbus))
 203                 jz4740_ohci->vbus = NULL;
 204
 205
 206         clk_set_rate(jz4740_ohci->clk, 48000000);
 207         clk_enable(jz4740_ohci->clk);
 208         if (jz4740_ohci->vbus)
 209                 ohci_jz4740_set_vbus_power(jz4740_ohci, true);
 210
 211         platform_set_drvdata(pdev, hcd);
 212
 213         ohci_hcd_init(hcd_to_ohci(hcd));
 214
 215         ret = usb_add_hcd(hcd, irq, 0);
 216         if (ret) {
 217                 dev_err(&pdev->dev, "Failed to add hcd: %d\n", ret);
 218                 goto err_disable;
 219         }
 220
 221         return 0;
 222
 223 err_disable:
 224         if (jz4740_ohci->vbus) {
 225                 regulator_disable(jz4740_ohci->vbus);
 226                 regulator_put(jz4740_ohci->vbus);
 227         }
 228         clk_disable(jz4740_ohci->clk);
 229
 230         clk_put(jz4740_ohci->clk);
 231 err_iounmap:
 232         iounmap(hcd->regs);
 233 err_release_mem:
 234         release_mem_region(res->start, resource_size(res));
 235 err_free:
 236         usb_put_hcd(hcd);
 237
 238         return ret;
 239 }
 240
 241 static int jz4740_ohci_remove(struct platform_device *pdev)
 242 {
 243         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 244         struct jz4740_ohci_hcd *jz4740_ohci = hcd_to_jz4740_hcd(hcd);
 245
 246         usb_remove_hcd(hcd);
 247
 248         if (jz4740_ohci->vbus) {
 249                 regulator_disable(jz4740_ohci->vbus);
 250                 regulator_put(jz4740_ohci->vbus);
 251         }
 252
 253         clk_disable(jz4740_ohci->clk);
 254         clk_put(jz4740_ohci->clk);
 255
 256         iounmap(hcd->regs);
 257         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 258
 259         usb_put_hcd(hcd);
 260
 261         return 0;
 262 }
 263
 264 static struct platform_driver ohci_hcd_jz4740_driver = {
 265         .probe = jz4740_ohci_probe,
 266         .remove = jz4740_ohci_remove,
 267         .driver = {
 268                 .name = "jz4740-ohci",
 269                 .owner = THIS_MODULE,
 270         },
 271 };
 272
 273 MODULE_ALIAS("platform:jz4740-ohci");