drivers/usb/host/ohci-sm501.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2005 David Brownell
   6  * (C) Copyright 2002 Hewlett-Packard Company
   7  * (C) Copyright 2008 Magnus Damm
   8  *
   9  * SM501 Bus Glue - based on ohci-omap.c
  10  *
  11  * This file is licenced under the GPL.
  12  */
  13
  14 #include <linux/interrupt.h>
  15 #include <linux/jiffies.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/sm501.h>
  19 #include <linux/sm501-regs.h>
  20
  21 static int ohci_sm501_init(struct usb_hcd *hcd)
  22 {
  23         return ohci_init(hcd_to_ohci(hcd));
  24 }
  25
  26 static int ohci_sm501_start(struct usb_hcd *hcd)
  27 {
  28         struct device *dev = hcd->self.controller;
  29         int ret;
  30
  31         ret = ohci_run(hcd_to_ohci(hcd));
  32         if (ret < 0) {
  33                 dev_err(dev, "can't start %s", hcd->self.bus_name);
  34                 ohci_stop(hcd);
  35         }
  36
  37         return ret;
  38 }
  39
  40 /*-------------------------------------------------------------------------*/
  41
  42 static const struct hc_driver ohci_sm501_hc_driver = {
  43         .description =          hcd_name,
  44         .product_desc =         "SM501 OHCI",
  45         .hcd_priv_size =        sizeof(struct ohci_hcd),
  46
  47         /*
  48          * generic hardware linkage
  49          */
  50         .irq =                  ohci_irq,
  51         .flags =                HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM,
  52
  53         /*
  54          * basic lifecycle operations
  55          */
  56         .reset =                ohci_sm501_init,
  57         .start =                ohci_sm501_start,
  58         .stop =                 ohci_stop,
  59         .shutdown =             ohci_shutdown,
  60
  61         /*
  62          * managing i/o requests and associated device resources
  63          */
  64         .urb_enqueue =          ohci_urb_enqueue,
  65         .urb_dequeue =          ohci_urb_dequeue,
  66         .endpoint_disable =     ohci_endpoint_disable,
  67
  68         /*
  69          * scheduling support
  70          */
  71         .get_frame_number =     ohci_get_frame,
  72
  73         /*
  74          * root hub support
  75          */
  76         .hub_status_data =      ohci_hub_status_data,
  77         .hub_control =          ohci_hub_control,
  78         .hub_irq_enable =       ohci_rhsc_enable,
  79 #ifdef  CONFIG_PM
  80         .bus_suspend =          ohci_bus_suspend,
  81         .bus_resume =           ohci_bus_resume,
  82 #endif
  83         .start_port_reset =     ohci_start_port_reset,
  84 };
  85
  86 /*-------------------------------------------------------------------------*/
  87
  88 static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev)
  89 {
  90         const struct hc_driver *driver = &ohci_sm501_hc_driver;
  91         struct device *dev = &pdev->dev;
  92         struct resource *res, *mem;
  93         int retval, irq;
  94         struct usb_hcd *hcd = NULL;
  95
  96         irq = retval = platform_get_irq(pdev, 0);
  97         if (retval < 0)
  98                 goto err0;
  99
 100         mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 101         if (mem == NULL) {
 102                 dev_err(dev, "no resource definition for memory\n");
 103                 retval = -ENOENT;
 104                 goto err0;
 105         }
 106
 107         if (!request_mem_region(mem->start, mem->end - mem->start + 1,
 108                                 pdev->name)) {
 109                 dev_err(dev, "request_mem_region failed\n");
 110                 retval = -EBUSY;
 111                 goto err0;
 112         }
 113
 114         /* The sm501 chip is equipped with local memory that may be used
 115          * by on-chip devices such as the video controller and the usb host.
 116          * This driver uses dma_declare_coherent_memory() to make sure
 117          * usb allocations with dma_alloc_coherent() allocate from
 118          * this local memory. The dma_handle returned by dma_alloc_coherent()
 119          * will be an offset starting from 0 for the first local memory byte.
 120          *
 121          * So as long as data is allocated using dma_alloc_coherent() all is
 122          * fine. This is however not always the case - buffers may be allocated
 123          * using kmalloc() - so the usb core needs to be told that it must copy
 124          * data into our local memory if the buffers happen to be placed in
 125          * regular memory. The HCD_LOCAL_MEM flag does just that.
 126          */
 127
 128         if (!dma_declare_coherent_memory(dev, mem->start,
 129                                          mem->start - mem->parent->start,
 130                                          (mem->end - mem->start) + 1,
 131                                          DMA_MEMORY_MAP |
 132                                          DMA_MEMORY_EXCLUSIVE)) {
 133                 dev_err(dev, "cannot declare coherent memory\n");
 134                 retval = -ENXIO;
 135                 goto err1;
 136         }
 137
 138         /* allocate, reserve and remap resources for registers */
 139         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 140         if (res == NULL) {
 141                 dev_err(dev, "no resource definition for registers\n");
 142                 retval = -ENOENT;
 143                 goto err2;
 144         }
 145
 146         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 147         if (!hcd) {
 148                 retval = -ENOMEM;
 149                 goto err2;
 150         }
 151
 152         hcd->rsrc_start = res->start;
 153         hcd->rsrc_len = res->end - res->start + 1;
 154
 155         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, pdev->name)) {
 156                 dev_err(dev, "request_mem_region failed\n");
 157                 retval = -EBUSY;
 158                 goto err3;
 159         }
 160
 161         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 162         if (hcd->regs == NULL) {
 163                 dev_err(dev, "cannot remap registers\n");
 164                 retval = -ENXIO;
 165                 goto err4;
 166         }
 167
 168         ohci_hcd_init(hcd_to_ohci(hcd));
 169
 170         retval = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
 171         if (retval)
 172                 goto err4;
 173
 174         /* enable power and unmask interrupts */
 175
 176         sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
 177         sm501_modify_reg(dev->parent, SM501_IRQ_MASK, 1 << 6, 0);
 178
 179         return 0;
 180 err4:
 181         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 182 err3:
 183         usb_put_hcd(hcd);
 184 err2:
 185         dma_release_declared_memory(dev);
 186 err1:
 187         release_mem_region(mem->start, mem->end - mem->start + 1);
 188 err0:
 189         return retval;
 190 }
 191
 192 static int ohci_hcd_sm501_drv_remove(struct platform_device *pdev)
 193 {
 194         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 195         struct resource *mem;
 196
 197         usb_remove_hcd(hcd);
 198         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 199         usb_put_hcd(hcd);
 200         dma_release_declared_memory(&pdev->dev);
 201         mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 202         if (mem)
 203                 release_mem_region(mem->start, mem->end - mem->start + 1);
 204
 205         /* mask interrupts and disable power */
 206
 207         sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6);
 208         sm501_unit_power(pdev->dev.parent, SM501_GATE_USB_HOST, 0);
 209
 210         platform_set_drvdata(pdev, NULL);
 211         return 0;
 212 }
 213
 214 /*-------------------------------------------------------------------------*/
 215
 216 #ifdef CONFIG_PM
 217 static int ohci_sm501_suspend(struct platform_device *pdev, pm_message_t msg)
 218 {
 219         struct device *dev = &pdev->dev;
 220         struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(pdev));
 221
 222         if (time_before(jiffies, ohci->next_statechange))
 223                 msleep(5);
 224         ohci->next_statechange = jiffies;
 225
 226         sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 0);
 227         ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED;
 228         return 0;
 229 }
 230
 231 static int ohci_sm501_resume(struct platform_device *pdev)
 232 {
 233         struct device *dev = &pdev->dev;
 234         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
 235         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 236
 237         if (time_before(jiffies, ohci->next_statechange))
 238                 msleep(5);
 239         ohci->next_statechange = jiffies;
 240
 241         sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
 242         ohci_finish_controller_resume(hcd);
 243         return 0;
 244 }
 245 #else
 246 #define ohci_sm501_suspend NULL
 247 #define ohci_sm501_resume NULL
 248 #endif
 249
 250 /*-------------------------------------------------------------------------*/
 251
 252 /*
 253  * Driver definition to register with the SM501 bus
 254  */
 255 static struct platform_driver ohci_hcd_sm501_driver = {
 256         .probe          = ohci_hcd_sm501_drv_probe,
 257         .remove         = ohci_hcd_sm501_drv_remove,
 258         .shutdown       = usb_hcd_platform_shutdown,
 259         .suspend        = ohci_sm501_suspend,
 260         .resume         = ohci_sm501_resume,
 261         .driver         = {
 262                 .owner  = THIS_MODULE,
 263                 .name   = "sm501-usb",
 264         },
 265 };
 266 MODULE_ALIAS("platform:sm501-usb");