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Diffstat (limited to 'drivers/usb/gadget/udc/amd5536udc_pci.c')
-rw-r--r--drivers/usb/gadget/udc/amd5536udc_pci.c217
1 files changed, 217 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 000000000000..2a2d0a96fe24
--- /dev/null
+++ b/drivers/usb/gadget/udc/amd5536udc_pci.c
@@ -0,0 +1,217 @@
+/*
+ * amd5536udc_pci.c -- AMD 5536 UDC high/full speed USB device controller
+ *
+ * Copyright (C) 2005-2007 AMD (http://www.amd.com)
+ * Author: Thomas Dahlmann
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+/*
+ * 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 mod_desc[] = UDC_MOD_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_nocache(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);
+
+ /* init dma pools */
+ if (use_dma) {
+ retval = init_dma_pools(dev);
+ if (retval != 0)
+ goto err_dma;
+ }
+
+ dev->phys_addr = resource;
+ dev->irq = pdev->irq;
+ dev->pdev = pdev;
+
+ /* general probing */
+ if (udc_probe(dev)) {
+ retval = -ENODEV;
+ goto err_probe;
+ }
+ 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 = (char *) 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");