diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/gadget/langwell_udc.c | 113 | ||||
| -rw-r--r-- | drivers/usb/gadget/langwell_udc.h | 12 |
2 files changed, 115 insertions, 10 deletions
diff --git a/drivers/usb/gadget/langwell_udc.c b/drivers/usb/gadget/langwell_udc.c index 4b134abb1dbe..ccc9c070a30d 100644 --- a/drivers/usb/gadget/langwell_udc.c +++ b/drivers/usb/gadget/langwell_udc.c @@ -2988,6 +2988,50 @@ static void gadget_release(struct device *_dev) } +/* enable SRAM caching if SRAM detected */ +static void sram_init(struct langwell_udc *dev) +{ + struct pci_dev *pdev = dev->pdev; + + dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__); + + dev->sram_addr = pci_resource_start(pdev, 1); + dev->sram_size = pci_resource_len(pdev, 1); + dev_info(&dev->pdev->dev, "Found private SRAM at %x size:%x\n", + dev->sram_addr, dev->sram_size); + dev->got_sram = 1; + + if (pci_request_region(pdev, 1, kobject_name(&pdev->dev.kobj))) { + dev_warn(&dev->pdev->dev, "SRAM request failed\n"); + dev->got_sram = 0; + } else if (!dma_declare_coherent_memory(&pdev->dev, dev->sram_addr, + dev->sram_addr, dev->sram_size, DMA_MEMORY_MAP)) { + dev_warn(&dev->pdev->dev, "SRAM DMA declare failed\n"); + pci_release_region(pdev, 1); + dev->got_sram = 0; + } + + dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__); +} + + +/* release SRAM caching */ +static void sram_deinit(struct langwell_udc *dev) +{ + struct pci_dev *pdev = dev->pdev; + + dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__); + + dma_release_declared_memory(&pdev->dev); + pci_release_region(pdev, 1); + + dev->got_sram = 0; + + dev_info(&dev->pdev->dev, "release SRAM caching\n"); + dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__); +} + + /* tear down the binding between this driver and the pci device */ static void langwell_udc_remove(struct pci_dev *pdev) { @@ -3000,19 +3044,25 @@ static void langwell_udc_remove(struct pci_dev *pdev) dev->done = &done; - /* free memory allocated in probe */ +#ifndef OTG_TRANSCEIVER + /* free dTD dma_pool and dQH */ if (dev->dtd_pool) dma_pool_destroy(dev->dtd_pool); + if (dev->ep_dqh) + dma_free_coherent(&pdev->dev, dev->ep_dqh_size, + dev->ep_dqh, dev->ep_dqh_dma); + + /* release SRAM caching */ + if (dev->has_sram && dev->got_sram) + sram_deinit(dev); +#endif + if (dev->status_req) { kfree(dev->status_req->req.buf); kfree(dev->status_req); } - if (dev->ep_dqh) - dma_free_coherent(&pdev->dev, dev->ep_dqh_size, - dev->ep_dqh, dev->ep_dqh_dma); - kfree(dev->ep); /* diable IRQ handler */ @@ -3140,7 +3190,15 @@ static int langwell_udc_probe(struct pci_dev *pdev, goto error; } + dev->has_sram = 1; + dev->got_sram = 0; + dev_vdbg(&dev->pdev->dev, "dev->has_sram: %d\n", dev->has_sram); + #ifndef OTG_TRANSCEIVER + /* enable SRAM caching if detected */ + if (dev->has_sram && !dev->got_sram) + sram_init(dev); + dev_info(&dev->pdev->dev, "irq %d, io mem: 0x%08lx, len: 0x%08lx, pci mem 0x%p\n", pdev->irq, resource, len, base); @@ -3335,6 +3393,18 @@ static int langwell_udc_suspend(struct pci_dev *pdev, pm_message_t state) /* save PCI state */ pci_save_state(pdev); + /* free dTD dma_pool and dQH */ + if (dev->dtd_pool) + dma_pool_destroy(dev->dtd_pool); + + if (dev->ep_dqh) + dma_free_coherent(&pdev->dev, dev->ep_dqh_size, + dev->ep_dqh, dev->ep_dqh_dma); + + /* release SRAM caching */ + if (dev->has_sram && dev->got_sram) + sram_deinit(dev); + /* set device power state */ pci_set_power_state(pdev, PCI_D3hot); @@ -3351,6 +3421,7 @@ static int langwell_udc_suspend(struct pci_dev *pdev, pm_message_t state) static int langwell_udc_resume(struct pci_dev *pdev) { struct langwell_udc *dev = the_controller; + size_t size; dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__); @@ -3361,6 +3432,38 @@ static int langwell_udc_resume(struct pci_dev *pdev) /* set device D0 power state */ pci_set_power_state(pdev, PCI_D0); + /* enable SRAM caching if detected */ + if (dev->has_sram && !dev->got_sram) + sram_init(dev); + + /* allocate device dQH memory */ + size = dev->ep_max * sizeof(struct langwell_dqh); + dev_vdbg(&dev->pdev->dev, "orig size = %d\n", size); + if (size < DQH_ALIGNMENT) + size = DQH_ALIGNMENT; + else if ((size % DQH_ALIGNMENT) != 0) { + size += DQH_ALIGNMENT + 1; + size &= ~(DQH_ALIGNMENT - 1); + } + dev->ep_dqh = dma_alloc_coherent(&pdev->dev, size, + &dev->ep_dqh_dma, GFP_KERNEL); + if (!dev->ep_dqh) { + dev_err(&dev->pdev->dev, "allocate dQH memory failed\n"); + return -ENOMEM; + } + dev->ep_dqh_size = size; + dev_vdbg(&dev->pdev->dev, "ep_dqh_size = %d\n", dev->ep_dqh_size); + + /* create dTD dma_pool resource */ + dev->dtd_pool = dma_pool_create("langwell_dtd", + &dev->pdev->dev, + sizeof(struct langwell_dtd), + DTD_ALIGNMENT, + DMA_BOUNDARY); + + if (!dev->dtd_pool) + return -ENOMEM; + /* restore PCI state */ pci_restore_state(pdev); diff --git a/drivers/usb/gadget/langwell_udc.h b/drivers/usb/gadget/langwell_udc.h index 3d3206eec544..f1d9c1bb04f3 100644 --- a/drivers/usb/gadget/langwell_udc.h +++ b/drivers/usb/gadget/langwell_udc.h @@ -18,11 +18,7 @@ */ #include <linux/usb/langwell_udc.h> - -#if defined(CONFIG_USB_LANGWELL_OTG) #include <linux/usb/langwell_otg.h> -#endif - /*-------------------------------------------------------------------------*/ @@ -199,7 +195,9 @@ struct langwell_udc { vbus_active:1, suspended:1, stopped:1, - lpm:1; /* LPM capability */ + lpm:1, /* LPM capability */ + has_sram:1, /* SRAM caching */ + got_sram:1; /* pci state used to access those endpoints */ struct pci_dev *pdev; @@ -225,6 +223,10 @@ struct langwell_udc { /* make sure release() is done */ struct completion *done; + /* for private SRAM caching */ + unsigned int sram_addr; + unsigned int sram_size; + /* device status data for get_status request */ u16 dev_status; }; |