drivers/usb/gadget/udc/amd5536udc_pci.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * amd5536udc_pci.c -- AMD 5536 UDC high/full speed USB device controller
   4  *
   5  * Copyright (C) 2005-2007 AMD (https://www.amd.com)
   6  * Author: Thomas Dahlmann
   7  */
   8
   9 /*
  10  * The AMD5536 UDC is part of the x86 southbridge AMD Geode CS5536.
  11  * It is a USB Highspeed DMA capable USB device controller. Beside ep0 it
  12  * provides 4 IN and 4 OUT endpoints (bulk or interrupt type).
  13  *
  14  * Make sure that UDC is assigned to port 4 by BIOS settings (port can also
  15  * be used as host port) and UOC bits PAD_EN and APU are set (should be done
  16  * by BIOS init).
  17  *
  18  * UDC DMA requires 32-bit aligned buffers so DMA with gadget ether does not
  19  * work without updating NET_IP_ALIGN. Or PIO mode (module param "use_dma=0")
  20  * can be used with gadget ether.
  21  *
  22  * This file does pci device registration, and the core driver implementation
  23  * is done in amd5536udc.c
  24  *
  25  * The driver is split so as to use the core UDC driver which is based on
  26  * Synopsys device controller IP (different than HS OTG IP) in UDCs
  27  * integrated to SoC platforms.
  28  *
  29  */
  30
  31 /* Driver strings */
  32 #define UDC_MOD_DESCRIPTION             "AMD 5536 UDC - USB Device Controller"
  33
  34 /* system */
  35 #include <linux/device.h>
  36 #include <linux/dmapool.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/io.h>
  39 #include <linux/irq.h>
  40 #include <linux/module.h>
  41 #include <linux/moduleparam.h>
  42 #include <linux/prefetch.h>
  43 #include <linux/pci.h>
  44
  45 /* udc specific */
  46 #include "amd5536udc.h"
  47
  48 /* pointer to device object */
  49 static struct udc *udc;
  50
  51 /* description */
  52 static const char name[] = "amd5536udc-pci";
  53
  54 /* Reset all pci context */
  55 static void udc_pci_remove(struct pci_dev *pdev)
  56 {
  57         struct udc              *dev;
  58
  59         dev = pci_get_drvdata(pdev);
  60
  61         usb_del_gadget_udc(&udc->gadget);
  62         /* gadget driver must not be registered */
  63         if (WARN_ON(dev->driver))
  64                 return;
  65
  66         /* dma pool cleanup */
  67         free_dma_pools(dev);
  68
  69         /* reset controller */
  70         writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
  71         free_irq(pdev->irq, dev);
  72         iounmap(dev->virt_addr);
  73         release_mem_region(pci_resource_start(pdev, 0),
  74                            pci_resource_len(pdev, 0));
  75         pci_disable_device(pdev);
  76
  77         udc_remove(dev);
  78 }
  79
  80 /* Called by pci bus driver to init pci context */
  81 static int udc_pci_probe(
  82         struct pci_dev *pdev,
  83         const struct pci_device_id *id
  84 )
  85 {
  86         struct udc              *dev;
  87         unsigned long           resource;
  88         unsigned long           len;
  89         int                     retval = 0;
  90
  91         /* one udc only */
  92         if (udc) {
  93                 dev_dbg(&pdev->dev, "already probed\n");
  94                 return -EBUSY;
  95         }
  96
  97         /* init */
  98         dev = kzalloc(sizeof(struct udc), GFP_KERNEL);
  99         if (!dev)
 100                 return -ENOMEM;
 101
 102         /* pci setup */
 103         if (pci_enable_device(pdev) < 0) {
 104                 retval = -ENODEV;
 105                 goto err_pcidev;
 106         }
 107
 108         /* PCI resource allocation */
 109         resource = pci_resource_start(pdev, 0);
 110         len = pci_resource_len(pdev, 0);
 111
 112         if (!request_mem_region(resource, len, name)) {
 113                 dev_dbg(&pdev->dev, "pci device used already\n");
 114                 retval = -EBUSY;
 115                 goto err_memreg;
 116         }
 117
 118         dev->virt_addr = ioremap(resource, len);
 119         if (!dev->virt_addr) {
 120                 dev_dbg(&pdev->dev, "start address cannot be mapped\n");
 121                 retval = -EFAULT;
 122                 goto err_ioremap;
 123         }
 124
 125         if (!pdev->irq) {
 126                 dev_err(&pdev->dev, "irq not set\n");
 127                 retval = -ENODEV;
 128                 goto err_irq;
 129         }
 130
 131         spin_lock_init(&dev->lock);
 132         /* udc csr registers base */
 133         dev->csr = dev->virt_addr + UDC_CSR_ADDR;
 134         /* dev registers base */
 135         dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
 136         /* ep registers base */
 137         dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
 138         /* fifo's base */
 139         dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
 140         dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
 141
 142         if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) {
 143                 dev_dbg(&pdev->dev, "request_irq(%d) fail\n", pdev->irq);
 144                 retval = -EBUSY;
 145                 goto err_irq;
 146         }
 147
 148         pci_set_drvdata(pdev, dev);
 149
 150         /* chip revision for Hs AMD5536 */
 151         dev->chiprev = pdev->revision;
 152
 153         pci_set_master(pdev);
 154         pci_try_set_mwi(pdev);
 155
 156         /* init dma pools */
 157         if (use_dma) {
 158                 retval = init_dma_pools(dev);
 159                 if (retval != 0)
 160                         goto err_dma;
 161         }
 162
 163         dev->phys_addr = resource;
 164         dev->irq = pdev->irq;
 165         dev->pdev = pdev;
 166         dev->dev = &pdev->dev;
 167
 168         /* general probing */
 169         if (udc_probe(dev)) {
 170                 retval = -ENODEV;
 171                 goto err_probe;
 172         }
 173         return 0;
 174
 175 err_probe:
 176         if (use_dma)
 177                 free_dma_pools(dev);
 178 err_dma:
 179         free_irq(pdev->irq, dev);
 180 err_irq:
 181         iounmap(dev->virt_addr);
 182 err_ioremap:
 183         release_mem_region(resource, len);
 184 err_memreg:
 185         pci_disable_device(pdev);
 186 err_pcidev:
 187         kfree(dev);
 188         return retval;
 189 }
 190
 191 /* PCI device parameters */
 192 static const struct pci_device_id pci_id[] = {
 193         {
 194                 PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x2096),
 195                 .class =        PCI_CLASS_SERIAL_USB_DEVICE,
 196                 .class_mask =   0xffffffff,
 197         },
 198         {},
 199 };
 200 MODULE_DEVICE_TABLE(pci, pci_id);
 201
 202 /* PCI functions */
 203 static struct pci_driver udc_pci_driver = {
 204         .name =         name,
 205         .id_table =     pci_id,
 206         .probe =        udc_pci_probe,
 207         .remove =       udc_pci_remove,
 208 };
 209 module_pci_driver(udc_pci_driver);
 210
 211 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
 212 MODULE_AUTHOR("Thomas Dahlmann");
 213 MODULE_LICENSE("GPL");