drivers/usb/host/ohci-sm501.c

   1 // SPDX-License-Identifier: GPL-1.0+
   2 /*
   3  * OHCI HCD (Host Controller Driver) for USB.
   4  *
   5  * (C) Copyright 1999 Roman Weissgaerber <[email protected]>
   6  * (C) Copyright 2000-2005 David Brownell
   7  * (C) Copyright 2002 Hewlett-Packard Company
   8  * (C) Copyright 2008 Magnus Damm
   9  *
  10  * SM501 Bus Glue - based on ohci-omap.c
  11  *
  12  * This file is licenced under the GPL.
  13  */
  14
  15 #include <linux/interrupt.h>
  16 #include <linux/jiffies.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/sm501.h>
  20 #include <linux/sm501-regs.h>
  21
  22 static int ohci_sm501_init(struct usb_hcd *hcd)
  23 {
  24         return ohci_init(hcd_to_ohci(hcd));
  25 }
  26
  27 static int ohci_sm501_start(struct usb_hcd *hcd)
  28 {
  29         struct device *dev = hcd->self.controller;
  30         int ret;
  31
  32         ret = ohci_run(hcd_to_ohci(hcd));
  33         if (ret < 0) {
  34                 dev_err(dev, "can't start %s", hcd->self.bus_name);
  35                 ohci_stop(hcd);
  36         }
  37
  38         return ret;
  39 }
  40
  41 /*-------------------------------------------------------------------------*/
  42
  43 static const struct hc_driver ohci_sm501_hc_driver = {
  44         .description =          hcd_name,
  45         .product_desc =         "SM501 OHCI",
  46         .hcd_priv_size =        sizeof(struct ohci_hcd),
  47
  48         /*
  49          * generic hardware linkage
  50          */
  51         .irq =                  ohci_irq,
  52         .flags =                HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM,
  53
  54         /*
  55          * basic lifecycle operations
  56          */
  57         .reset =                ohci_sm501_init,
  58         .start =                ohci_sm501_start,
  59         .stop =                 ohci_stop,
  60         .shutdown =             ohci_shutdown,
  61
  62         /*
  63          * managing i/o requests and associated device resources
  64          */
  65         .urb_enqueue =          ohci_urb_enqueue,
  66         .urb_dequeue =          ohci_urb_dequeue,
  67         .endpoint_disable =     ohci_endpoint_disable,
  68
  69         /*
  70          * scheduling support
  71          */
  72         .get_frame_number =     ohci_get_frame,
  73
  74         /*
  75          * root hub support
  76          */
  77         .hub_status_data =      ohci_hub_status_data,
  78         .hub_control =          ohci_hub_control,
  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, resource_size(mem), 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         retval = dma_declare_coherent_memory(dev, mem->start,
 128                                          mem->start - mem->parent->start,
 129                                          resource_size(mem),
 130                                          DMA_MEMORY_EXCLUSIVE);
 131         if (retval) {
 132                 dev_err(dev, "cannot declare coherent memory\n");
 133                 goto err1;
 134         }
 135
 136         /* allocate, reserve and remap resources for registers */
 137         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 138         if (res == NULL) {
 139                 dev_err(dev, "no resource definition for registers\n");
 140                 retval = -ENOENT;
 141                 goto err2;
 142         }
 143
 144         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 145         if (!hcd) {
 146                 retval = -ENOMEM;
 147                 goto err2;
 148         }
 149
 150         hcd->rsrc_start = res->start;
 151         hcd->rsrc_len = resource_size(res);
 152
 153         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, pdev->name)) {
 154                 dev_err(dev, "request_mem_region failed\n");
 155                 retval = -EBUSY;
 156                 goto err3;
 157         }
 158
 159         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 160         if (hcd->regs == NULL) {
 161                 dev_err(dev, "cannot remap registers\n");
 162                 retval = -ENXIO;
 163                 goto err4;
 164         }
 165
 166         ohci_hcd_init(hcd_to_ohci(hcd));
 167
 168         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 169         if (retval)
 170                 goto err5;
 171         device_wakeup_enable(hcd->self.controller);
 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 err5:
 180         iounmap(hcd->regs);
 181 err4:
 182         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 183 err3:
 184         usb_put_hcd(hcd);
 185 err2:
 186         dma_release_declared_memory(dev);
 187 err1:
 188         release_mem_region(mem->start, resource_size(mem));
 189 err0:
 190         return retval;
 191 }
 192
 193 static int ohci_hcd_sm501_drv_remove(struct platform_device *pdev)
 194 {
 195         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 196         struct resource *mem;
 197
 198         usb_remove_hcd(hcd);
 199         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 200         usb_put_hcd(hcd);
 201         dma_release_declared_memory(&pdev->dev);
 202         mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 203         if (mem)
 204                 release_mem_region(mem->start, resource_size(mem));
 205
 206         /* mask interrupts and disable power */
 207
 208         sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6);
 209         sm501_unit_power(pdev->dev.parent, SM501_GATE_USB_HOST, 0);
 210
 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 usb_hcd  *hcd = platform_get_drvdata(pdev);
 221         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 222         bool do_wakeup = device_may_wakeup(dev);
 223         int ret;
 224
 225         if (time_before(jiffies, ohci->next_statechange))
 226                 msleep(5);
 227         ohci->next_statechange = jiffies;
 228
 229         ret = ohci_suspend(hcd, do_wakeup);
 230         if (ret)
 231                 return ret;
 232
 233         sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 0);
 234         return ret;
 235 }
 236
 237 static int ohci_sm501_resume(struct platform_device *pdev)
 238 {
 239         struct device *dev = &pdev->dev;
 240         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
 241         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 242
 243         if (time_before(jiffies, ohci->next_statechange))
 244                 msleep(5);
 245         ohci->next_statechange = jiffies;
 246
 247         sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
 248         ohci_resume(hcd, false);
 249         return 0;
 250 }
 251 #else
 252 #define ohci_sm501_suspend NULL
 253 #define ohci_sm501_resume NULL
 254 #endif
 255
 256 /*-------------------------------------------------------------------------*/
 257
 258 /*
 259  * Driver definition to register with the SM501 bus
 260  */
 261 static struct platform_driver ohci_hcd_sm501_driver = {
 262         .probe          = ohci_hcd_sm501_drv_probe,
 263         .remove         = ohci_hcd_sm501_drv_remove,
 264         .shutdown       = usb_hcd_platform_shutdown,
 265         .suspend        = ohci_sm501_suspend,
 266         .resume         = ohci_sm501_resume,
 267         .driver         = {
 268                 .name   = "sm501-usb",
 269         },
 270 };
 271 MODULE_ALIAS("platform:sm501-usb");