diff options
Diffstat (limited to 'drivers/usb/gadget/udc/amd5536udc_pci.c')
| -rw-r--r-- | drivers/usb/gadget/udc/amd5536udc_pci.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/drivers/usb/gadget/udc/amd5536udc_pci.c b/drivers/usb/gadget/udc/amd5536udc_pci.c new file mode 100644 index 000000000..a36913ae3 --- /dev/null +++ b/drivers/usb/gadget/udc/amd5536udc_pci.c @@ -0,0 +1,216 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * amd5536udc_pci.c -- AMD 5536 UDC high/full speed USB device controller + * + * Copyright (C) 2005-2007 AMD (https://www.amd.com) + * Author: Thomas Dahlmann + */ + +/* + * The AMD5536 UDC is part of the x86 southbridge AMD Geode CS5536. + * It is a USB Highspeed DMA capable USB device controller. Beside ep0 it + * provides 4 IN and 4 OUT endpoints (bulk or interrupt type). + * + * Make sure that UDC is assigned to port 4 by BIOS settings (port can also + * be used as host port) and UOC bits PAD_EN and APU are set (should be done + * by BIOS init). + * + * UDC DMA requires 32-bit aligned buffers so DMA with gadget ether does not + * work without updating NET_IP_ALIGN. Or PIO mode (module param "use_dma=0") + * can be used with gadget ether. + * + * This file does pci device registration, and the core driver implementation + * is done in amd5536udc.c + * + * The driver is split so as to use the core UDC driver which is based on + * Synopsys device controller IP (different than HS OTG IP) in UDCs + * integrated to SoC platforms. + * + */ + +/* Driver strings */ +#define UDC_MOD_DESCRIPTION "AMD 5536 UDC - USB Device Controller" + +/* system */ +#include <linux/device.h> +#include <linux/dmapool.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/prefetch.h> +#include <linux/pci.h> + +/* udc specific */ +#include "amd5536udc.h" + +/* pointer to device object */ +static struct udc *udc; + +/* description */ +static const char name[] = "amd5536udc-pci"; + +/* Reset all pci context */ +static void udc_pci_remove(struct pci_dev *pdev) +{ + struct udc *dev; + + dev = pci_get_drvdata(pdev); + + usb_del_gadget_udc(&udc->gadget); + /* gadget driver must not be registered */ + if (WARN_ON(dev->driver)) + return; + + /* dma pool cleanup */ + free_dma_pools(dev); + + /* reset controller */ + writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg); + free_irq(pdev->irq, dev); + iounmap(dev->virt_addr); + release_mem_region(pci_resource_start(pdev, 0), + pci_resource_len(pdev, 0)); + pci_disable_device(pdev); + + udc_remove(dev); +} + +/* Called by pci bus driver to init pci context */ +static int udc_pci_probe( + struct pci_dev *pdev, + const struct pci_device_id *id +) +{ + struct udc *dev; + unsigned long resource; + unsigned long len; + int retval = 0; + + /* one udc only */ + if (udc) { + dev_dbg(&pdev->dev, "already probed\n"); + return -EBUSY; + } + + /* init */ + dev = kzalloc(sizeof(struct udc), GFP_KERNEL); + if (!dev) + return -ENOMEM; + + /* pci setup */ + if (pci_enable_device(pdev) < 0) { + retval = -ENODEV; + goto err_pcidev; + } + + /* PCI resource allocation */ + resource = pci_resource_start(pdev, 0); + len = pci_resource_len(pdev, 0); + + if (!request_mem_region(resource, len, name)) { + dev_dbg(&pdev->dev, "pci device used already\n"); + retval = -EBUSY; + goto err_memreg; + } + + dev->virt_addr = ioremap(resource, len); + if (!dev->virt_addr) { + dev_dbg(&pdev->dev, "start address cannot be mapped\n"); + retval = -EFAULT; + goto err_ioremap; + } + + if (!pdev->irq) { + dev_err(&pdev->dev, "irq not set\n"); + retval = -ENODEV; + goto err_irq; + } + + spin_lock_init(&dev->lock); + /* udc csr registers base */ + dev->csr = dev->virt_addr + UDC_CSR_ADDR; + /* dev registers base */ + dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR; + /* ep registers base */ + dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR; + /* fifo's base */ + dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR); + dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR); + + if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) { + dev_dbg(&pdev->dev, "request_irq(%d) fail\n", pdev->irq); + retval = -EBUSY; + goto err_irq; + } + + pci_set_drvdata(pdev, dev); + + /* chip revision for Hs AMD5536 */ + dev->chiprev = pdev->revision; + + pci_set_master(pdev); + pci_try_set_mwi(pdev); + + dev->phys_addr = resource; + dev->irq = pdev->irq; + dev->pdev = pdev; + dev->dev = &pdev->dev; + + /* init dma pools */ + if (use_dma) { + retval = init_dma_pools(dev); + if (retval != 0) + goto err_dma; + } + + /* general probing */ + if (udc_probe(dev)) { + retval = -ENODEV; + goto err_probe; + } + + udc = dev; + + return 0; + +err_probe: + if (use_dma) + free_dma_pools(dev); +err_dma: + free_irq(pdev->irq, dev); +err_irq: + iounmap(dev->virt_addr); +err_ioremap: + release_mem_region(resource, len); +err_memreg: + pci_disable_device(pdev); +err_pcidev: + kfree(dev); + return retval; +} + +/* PCI device parameters */ +static const struct pci_device_id pci_id[] = { + { + PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x2096), + .class = PCI_CLASS_SERIAL_USB_DEVICE, + .class_mask = 0xffffffff, + }, + {}, +}; +MODULE_DEVICE_TABLE(pci, pci_id); + +/* PCI functions */ +static struct pci_driver udc_pci_driver = { + .name = name, + .id_table = pci_id, + .probe = udc_pci_probe, + .remove = udc_pci_remove, +}; +module_pci_driver(udc_pci_driver); + +MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION); +MODULE_AUTHOR("Thomas Dahlmann"); +MODULE_LICENSE("GPL"); |