mirror of
https://github.com/followmsi/android_kernel_google_msm.git
synced 2024-11-06 23:17:41 +00:00
096c222a7b
In Synopsis DWC3 controller, PORTSC register access involves multiple clock domains. When the software does a PORTSC write, handshakes are needed across these clock domains. This results in long access times, especially for USB 2.0 ports. In order to solve this issue, when the PORTSC write operations happen on the system bus, the command is latched and system bus is released immediately. However, the real PORTSC write access will take some time internally to complete. If the software quickly does a read to the PORTSC, some fields (port status change related fields like OCC, etc.) may not have correct value due to the current way of handling these bits. The workaround is to give some delay (5 mac2_clk -> UTMI clock = 60 MHz -> (16.66 ns x 5 = 84ns) ~100ns after writing to the PORTSC register. Add controller vendor id and revision fields to the XHCI platform data. Update quirks field based on the vendor id and revision in the XHCI platform driver. CRs-fixed: 371299 Change-Id: Ibe4a88119c483afb522e9a96667f17dccbf74122 Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/**
|
|
* host.c - DesignWare USB3 DRD Controller Host Glue
|
|
*
|
|
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
|
|
*
|
|
* Authors: Felipe Balbi <balbi@ti.com>,
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions, and the following disclaimer,
|
|
* without modification.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The names of the above-listed copyright holders may not be used
|
|
* to endorse or promote products derived from this software without
|
|
* specific prior written permission.
|
|
*
|
|
* ALTERNATIVELY, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2, as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
|
|
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
|
|
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <linux/platform_device.h>
|
|
|
|
#include "core.h"
|
|
#include "xhci.h"
|
|
|
|
int dwc3_host_init(struct dwc3 *dwc)
|
|
{
|
|
struct platform_device *xhci;
|
|
int ret;
|
|
struct xhci_plat_data pdata;
|
|
|
|
xhci = platform_device_alloc("xhci-hcd", -1);
|
|
if (!xhci) {
|
|
dev_err(dwc->dev, "couldn't allocate xHCI device\n");
|
|
ret = -ENOMEM;
|
|
goto err0;
|
|
}
|
|
|
|
dma_set_coherent_mask(&xhci->dev, dwc->dev->coherent_dma_mask);
|
|
|
|
xhci->dev.parent = dwc->dev;
|
|
xhci->dev.dma_mask = dwc->dev->dma_mask;
|
|
xhci->dev.dma_parms = dwc->dev->dma_parms;
|
|
|
|
dwc->xhci = xhci;
|
|
pdata.vendor = ((dwc->revision & DWC3_GSNPSID_MASK) >>
|
|
__ffs(DWC3_GSNPSID_MASK) & DWC3_GSNPSREV_MASK);
|
|
pdata.revision = dwc->revision & DWC3_GSNPSREV_MASK;
|
|
|
|
ret = platform_device_add_data(xhci, (const void *) &pdata,
|
|
sizeof(struct xhci_plat_data));
|
|
if (ret) {
|
|
dev_err(dwc->dev, "couldn't add pdata to xHCI device\n");
|
|
goto err1;
|
|
}
|
|
|
|
ret = platform_device_add_resources(xhci, dwc->xhci_resources,
|
|
DWC3_XHCI_RESOURCES_NUM);
|
|
if (ret) {
|
|
dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
|
|
goto err1;
|
|
}
|
|
|
|
ret = platform_device_add(xhci);
|
|
if (ret) {
|
|
dev_err(dwc->dev, "failed to register xHCI device\n");
|
|
goto err1;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err1:
|
|
platform_device_put(xhci);
|
|
|
|
err0:
|
|
return ret;
|
|
}
|
|
|
|
void dwc3_host_exit(struct dwc3 *dwc)
|
|
{
|
|
platform_device_unregister(dwc->xhci);
|
|
}
|