275 lines
6.6 KiB
C
275 lines
6.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Sonics Silicon Backplane
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* Broadcom USB-core driver (SSB bus glue)
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*
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* Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
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*
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* Based on ssb-ohci driver
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* Copyright 2007 Michael Buesch <m@bues.ch>
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*
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* Derived from the OHCI-PCI driver
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* Copyright 1999 Roman Weissgaerber
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* Copyright 2000-2002 David Brownell
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* Copyright 1999 Linus Torvalds
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* Copyright 1999 Gregory P. Smith
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*
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* Derived from the USBcore related parts of Broadcom-SB
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* Copyright 2005-2011 Broadcom Corporation
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*/
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#include <linux/ssb/ssb.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/usb/ehci_pdriver.h>
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#include <linux/usb/ohci_pdriver.h>
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MODULE_AUTHOR("Hauke Mehrtens");
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MODULE_DESCRIPTION("Common USB driver for SSB Bus");
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MODULE_LICENSE("GPL");
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#define SSB_HCD_TMSLOW_HOSTMODE (1 << 29)
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struct ssb_hcd_device {
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struct platform_device *ehci_dev;
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struct platform_device *ohci_dev;
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u32 enable_flags;
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};
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static void ssb_hcd_5354wa(struct ssb_device *dev)
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{
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#ifdef CONFIG_SSB_DRIVER_MIPS
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/* Work around for 5354 failures */
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if (dev->id.revision == 2 && dev->bus->chip_id == 0x5354) {
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/* Change syn01 reg */
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ssb_write32(dev, 0x894, 0x00fe00fe);
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/* Change syn03 reg */
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ssb_write32(dev, 0x89c, ssb_read32(dev, 0x89c) | 0x1);
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}
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#endif
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}
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static void ssb_hcd_usb20wa(struct ssb_device *dev)
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{
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if (dev->id.coreid == SSB_DEV_USB20_HOST) {
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/*
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* USB 2.0 special considerations:
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*
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* In addition to the standard SSB reset sequence, the Host
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* Control Register must be programmed to bring the USB core
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* and various phy components out of reset.
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*/
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ssb_write32(dev, 0x200, 0x7ff);
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/* Change Flush control reg */
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ssb_write32(dev, 0x400, ssb_read32(dev, 0x400) & ~8);
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ssb_read32(dev, 0x400);
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/* Change Shim control reg */
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ssb_write32(dev, 0x304, ssb_read32(dev, 0x304) & ~0x100);
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ssb_read32(dev, 0x304);
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udelay(1);
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ssb_hcd_5354wa(dev);
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}
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}
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/* based on arch/mips/brcm-boards/bcm947xx/pcibios.c */
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static u32 ssb_hcd_init_chip(struct ssb_device *dev)
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{
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u32 flags = 0;
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if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV)
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/* Put the device into host-mode. */
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flags |= SSB_HCD_TMSLOW_HOSTMODE;
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ssb_device_enable(dev, flags);
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ssb_hcd_usb20wa(dev);
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return flags;
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}
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static const struct usb_ehci_pdata ehci_pdata = {
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};
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static const struct usb_ohci_pdata ohci_pdata = {
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};
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static struct platform_device *ssb_hcd_create_pdev(struct ssb_device *dev, bool ohci, u32 addr, u32 len)
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{
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struct platform_device *hci_dev;
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struct resource hci_res[2];
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int ret;
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memset(hci_res, 0, sizeof(hci_res));
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hci_res[0].start = addr;
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hci_res[0].end = hci_res[0].start + len - 1;
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hci_res[0].flags = IORESOURCE_MEM;
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hci_res[1].start = dev->irq;
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hci_res[1].flags = IORESOURCE_IRQ;
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hci_dev = platform_device_alloc(ohci ? "ohci-platform" :
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"ehci-platform" , 0);
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if (!hci_dev)
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return ERR_PTR(-ENOMEM);
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hci_dev->dev.parent = dev->dev;
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hci_dev->dev.dma_mask = &hci_dev->dev.coherent_dma_mask;
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ret = platform_device_add_resources(hci_dev, hci_res,
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ARRAY_SIZE(hci_res));
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if (ret)
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goto err_alloc;
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if (ohci)
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ret = platform_device_add_data(hci_dev, &ohci_pdata,
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sizeof(ohci_pdata));
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else
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ret = platform_device_add_data(hci_dev, &ehci_pdata,
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sizeof(ehci_pdata));
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if (ret)
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goto err_alloc;
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ret = platform_device_add(hci_dev);
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if (ret)
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goto err_alloc;
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return hci_dev;
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err_alloc:
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platform_device_put(hci_dev);
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return ERR_PTR(ret);
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}
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static int ssb_hcd_probe(struct ssb_device *dev,
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const struct ssb_device_id *id)
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{
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int err, tmp;
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int start, len;
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u16 chipid_top;
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u16 coreid = dev->id.coreid;
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struct ssb_hcd_device *usb_dev;
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/* USBcores are only connected on embedded devices. */
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chipid_top = (dev->bus->chip_id & 0xFF00);
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if (chipid_top != 0x4700 && chipid_top != 0x5300)
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return -ENODEV;
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/* TODO: Probably need checks here; is the core connected? */
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if (dma_set_mask_and_coherent(dev->dma_dev, DMA_BIT_MASK(32)))
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return -EOPNOTSUPP;
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usb_dev = devm_kzalloc(dev->dev, sizeof(struct ssb_hcd_device),
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GFP_KERNEL);
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if (!usb_dev)
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return -ENOMEM;
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/* We currently always attach SSB_DEV_USB11_HOSTDEV
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* as HOST OHCI. If we want to attach it as Client device,
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* we must branch here and call into the (yet to
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* be written) Client mode driver. Same for remove(). */
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usb_dev->enable_flags = ssb_hcd_init_chip(dev);
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tmp = ssb_read32(dev, SSB_ADMATCH0);
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start = ssb_admatch_base(tmp);
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len = (coreid == SSB_DEV_USB20_HOST) ? 0x800 : ssb_admatch_size(tmp);
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usb_dev->ohci_dev = ssb_hcd_create_pdev(dev, true, start, len);
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if (IS_ERR(usb_dev->ohci_dev))
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return PTR_ERR(usb_dev->ohci_dev);
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if (coreid == SSB_DEV_USB20_HOST) {
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start = ssb_admatch_base(tmp) + 0x800; /* ehci core offset */
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usb_dev->ehci_dev = ssb_hcd_create_pdev(dev, false, start, len);
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if (IS_ERR(usb_dev->ehci_dev)) {
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err = PTR_ERR(usb_dev->ehci_dev);
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goto err_unregister_ohci_dev;
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}
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}
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ssb_set_drvdata(dev, usb_dev);
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return 0;
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err_unregister_ohci_dev:
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platform_device_unregister(usb_dev->ohci_dev);
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return err;
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}
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static void ssb_hcd_remove(struct ssb_device *dev)
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{
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struct ssb_hcd_device *usb_dev = ssb_get_drvdata(dev);
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struct platform_device *ohci_dev = usb_dev->ohci_dev;
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struct platform_device *ehci_dev = usb_dev->ehci_dev;
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if (ohci_dev)
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platform_device_unregister(ohci_dev);
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if (ehci_dev)
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platform_device_unregister(ehci_dev);
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ssb_device_disable(dev, 0);
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}
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static void ssb_hcd_shutdown(struct ssb_device *dev)
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{
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ssb_device_disable(dev, 0);
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}
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#ifdef CONFIG_PM
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static int ssb_hcd_suspend(struct ssb_device *dev, pm_message_t state)
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{
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ssb_device_disable(dev, 0);
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return 0;
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}
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static int ssb_hcd_resume(struct ssb_device *dev)
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{
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struct ssb_hcd_device *usb_dev = ssb_get_drvdata(dev);
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ssb_device_enable(dev, usb_dev->enable_flags);
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return 0;
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}
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#else /* !CONFIG_PM */
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#define ssb_hcd_suspend NULL
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#define ssb_hcd_resume NULL
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#endif /* CONFIG_PM */
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static const struct ssb_device_id ssb_hcd_table[] = {
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SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV),
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SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV),
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SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB20_HOST, SSB_ANY_REV),
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{},
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};
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MODULE_DEVICE_TABLE(ssb, ssb_hcd_table);
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static struct ssb_driver ssb_hcd_driver = {
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.name = KBUILD_MODNAME,
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.id_table = ssb_hcd_table,
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.probe = ssb_hcd_probe,
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.remove = ssb_hcd_remove,
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.shutdown = ssb_hcd_shutdown,
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.suspend = ssb_hcd_suspend,
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.resume = ssb_hcd_resume,
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};
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static int __init ssb_hcd_init(void)
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{
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return ssb_driver_register(&ssb_hcd_driver);
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}
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module_init(ssb_hcd_init);
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static void __exit ssb_hcd_exit(void)
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{
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ssb_driver_unregister(&ssb_hcd_driver);
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}
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module_exit(ssb_hcd_exit);
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