mirror of https://gitee.com/openkylin/linux.git
103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
/*
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* Copyright(c) 2015, 2016 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/delay.h>
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#include "hfi.h"
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#include "common.h"
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#include "eprom.h"
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#define CMD_SHIFT 24
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#define CMD_RELEASE_POWERDOWN_NOID ((0xab << CMD_SHIFT))
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/* controller interface speeds */
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#define EP_SPEED_FULL 0x2 /* full speed */
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/*
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* How long to wait for the EPROM to become available, in ms.
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* The spec 32 Mb EPROM takes around 40s to erase then write.
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* Double it for safety.
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*/
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#define EPROM_TIMEOUT 80000 /* ms */
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/*
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* Initialize the EPROM handler.
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*/
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int eprom_init(struct hfi1_devdata *dd)
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{
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int ret = 0;
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/* only the discrete chip has an EPROM */
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if (dd->pcidev->device != PCI_DEVICE_ID_INTEL0)
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return 0;
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/*
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* It is OK if both HFIs reset the EPROM as long as they don't
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* do it at the same time.
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*/
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ret = acquire_chip_resource(dd, CR_EPROM, EPROM_TIMEOUT);
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if (ret) {
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dd_dev_err(dd,
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"%s: unable to acquire EPROM resource, no EPROM support\n",
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__func__);
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goto done_asic;
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}
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/* reset EPROM to be sure it is in a good state */
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/* set reset */
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write_csr(dd, ASIC_EEP_CTL_STAT, ASIC_EEP_CTL_STAT_EP_RESET_SMASK);
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/* clear reset, set speed */
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write_csr(dd, ASIC_EEP_CTL_STAT,
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EP_SPEED_FULL << ASIC_EEP_CTL_STAT_RATE_SPI_SHIFT);
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/* wake the device with command "release powerdown NoID" */
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write_csr(dd, ASIC_EEP_ADDR_CMD, CMD_RELEASE_POWERDOWN_NOID);
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dd->eprom_available = true;
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release_chip_resource(dd, CR_EPROM);
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done_asic:
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return ret;
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}
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