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 #ifdef  CONFIG_PM
  79         .bus_suspend =          ohci_bus_suspend,
  80         .bus_resume =           ohci_bus_resume,
  81 #endif
  82         .start_port_reset =     ohci_start_port_reset,
  83 };
  84
  85 /*-------------------------------------------------------------------------*/
  86
  87 static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev)
  88 {
  89         const struct hc_driver *driver = &ohci_sm501_hc_driver;
  90         struct device *dev = &pdev->dev;
  91         struct resource *res, *mem;
  92         int retval, irq;
  93         struct usb_hcd *hcd = NULL;
  94
  95         irq = retval = platform_get_irq(pdev, 0);
  96         if (retval < 0)
  97                 goto err0;
  98
  99         mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 100         if (mem == NULL) {
 101                 dev_err(dev, "no resource definition for memory\n");
 102                 retval = -ENOENT;
 103                 goto err0;
 104         }
 105
 106         if (!request_mem_region(mem->start, mem->end - mem->start + 1,
 107                                 pdev->name)) {
 108                 dev_err(dev, "request_mem_region failed\n");
 109                 retval = -EBUSY;
 110                 goto err0;
 111         }
 112
 113         /* The sm501 chip is equipped with local memory that may be used
 114          * by on-chip devices such as the video controller and the usb host.
 115          * This driver uses dma_declare_coherent_memory() to make sure
 116          * usb allocations with dma_alloc_coherent() allocate from
 117          * this local memory. The dma_handle returned by dma_alloc_coherent()
 118          * will be an offset starting from 0 for the first local memory byte.
 119          *
 120          * So as long as data is allocated using dma_alloc_coherent() all is
 121          * fine. This is however not always the case - buffers may be allocated
 122          * using kmalloc() - so the usb core needs to be told that it must copy
 123          * data into our local memory if the buffers happen to be placed in
 124          * regular memory. The HCD_LOCAL_MEM flag does just that.
 125          */
 126
 127         if (!dma_declare_coherent_memory(dev, mem->start,
 128                                          mem->start - mem->parent->start,
 129                                          (mem->end - mem->start) + 1,
 130                                          DMA_MEMORY_MAP |
 131                                          DMA_MEMORY_EXCLUSIVE)) {
 132                 dev_err(dev, "cannot declare coherent memory\n");
 133                 retval = -ENXIO;
 134                 goto err1;
 135         }
 136
 137         /* allocate, reserve and remap resources for registers */
 138         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 139         if (res == NULL) {
 140                 dev_err(dev, "no resource definition for registers\n");
 141                 retval = -ENOENT;
 142                 goto err2;
 143         }
 144
 145         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 146         if (!hcd) {
 147                 retval = -ENOMEM;
 148                 goto err2;
 149         }
 150
 151         hcd->rsrc_start = res->start;
 152         hcd->rsrc_len = res->end - res->start + 1;
 153
 154         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, pdev->name)) {
 155                 dev_err(dev, "request_mem_region failed\n");
 156                 retval = -EBUSY;
 157                 goto err3;
 158         }
 159
 160         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 161         if (hcd->regs == NULL) {
 162                 dev_err(dev, "cannot remap registers\n");
 163                 retval = -ENXIO;
 164                 goto err4;
 165         }
 166
 167         ohci_hcd_init(hcd_to_ohci(hcd));
 168
 169         retval = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
 170         if (retval)
 171                 goto err4;
 172
 173         /* enable power and unmask interrupts */
 174
 175         sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
 176         sm501_modify_reg(dev->parent, SM501_IRQ_MASK, 1 << 6, 0);
 177
 178         return 0;
 179 err4:
 180         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 181 err3:
 182         usb_put_hcd(hcd);
 183 err2:
 184         dma_release_declared_memory(dev);
 185 err1:
 186         release_mem_region(mem->start, mem->end - mem->start + 1);
 187 err0:
 188         return retval;
 189 }
 190
 191 static int ohci_hcd_sm501_drv_remove(struct platform_device *pdev)
 192 {
 193         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 194         struct resource *mem;
 195
 196         usb_remove_hcd(hcd);
 197         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 198         usb_put_hcd(hcd);
 199         dma_release_declared_memory(&pdev->dev);
 200         mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 201         if (mem)
 202                 release_mem_region(mem->start, mem->end - mem->start + 1);
 203
 204         /* mask interrupts and disable power */
 205
 206         sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6);
 207         sm501_unit_power(pdev->dev.parent, SM501_GATE_USB_HOST, 0);
 208
 209         platform_set_drvdata(pdev, NULL);
 210         return 0;
 211 }
 212
 213 /*-------------------------------------------------------------------------*/
 214
 215 #ifdef CONFIG_PM
 216 static int ohci_sm501_suspend(struct platform_device *pdev, pm_message_t msg)
 217 {
 218         struct device *dev = &pdev->dev;
 219         struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(pdev));
 220
 221         if (time_before(jiffies, ohci->next_statechange))
 222                 msleep(5);
 223         ohci->next_statechange = jiffies;
 224
 225         sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 0);
 226         ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED;
 227         return 0;
 228 }
 229
 230 static int ohci_sm501_resume(struct platform_device *pdev)
 231 {
 232         struct device *dev = &pdev->dev;
 233         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
 234         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 235
 236         if (time_before(jiffies, ohci->next_statechange))
 237                 msleep(5);
 238         ohci->next_statechange = jiffies;
 239
 240         sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
 241         ohci_finish_controller_resume(hcd);
 242         return 0;
 243 }
 244 #else
 245 #define ohci_sm501_suspend NULL
 246 #define ohci_sm501_resume NULL
 247 #endif
 248
 249 /*-------------------------------------------------------------------------*/
 250
 251 /*
 252  * Driver definition to register with the SM501 bus
 253  */
 254 static struct platform_driver ohci_hcd_sm501_driver = {
 255         .probe          = ohci_hcd_sm501_drv_probe,
 256         .remove         = ohci_hcd_sm501_drv_remove,
 257         .shutdown       = usb_hcd_platform_shutdown,
 258         .suspend        = ohci_sm501_suspend,
 259         .resume         = ohci_sm501_resume,
 260         .driver         = {
 261                 .owner  = THIS_MODULE,
 262                 .name   = "sm501-usb",
 263         },
 264 };
 265 MODULE_ALIAS("platform:sm501-usb");