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/*
* Copyright(c) 2015, 2016 Intel Corporation.
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* BSD LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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/delay.h>
#include "hfi.h"
#include "common.h"
#include "eprom.h"
#define CMD_SHIFT 24
#define CMD_RELEASE_POWERDOWN_NOID ((0xab << CMD_SHIFT))
/* controller interface speeds */
#define EP_SPEED_FULL 0x2 /* full speed */
/*
* How long to wait for the EPROM to become available, in ms.
* The spec 32 Mb EPROM takes around 40s to erase then write.
* Double it for safety.
*/
#define EPROM_TIMEOUT 80000 /* ms */
/*
* Initialize the EPROM handler.
*/
int eprom_init(struct hfi1_devdata *dd)
{
int ret = 0;
/* only the discrete chip has an EPROM */
if (dd->pcidev->device != PCI_DEVICE_ID_INTEL0)
return 0;
/*
* It is OK if both HFIs reset the EPROM as long as they don't
* do it at the same time.
*/
ret = acquire_chip_resource(dd, CR_EPROM, EPROM_TIMEOUT);
if (ret) {
dd_dev_err(dd,
"%s: unable to acquire EPROM resource, no EPROM support\n",
__func__);
goto done_asic;
}
/* reset EPROM to be sure it is in a good state */
/* set reset */
write_csr(dd, ASIC_EEP_CTL_STAT, ASIC_EEP_CTL_STAT_EP_RESET_SMASK);
/* clear reset, set speed */
write_csr(dd, ASIC_EEP_CTL_STAT,
EP_SPEED_FULL << ASIC_EEP_CTL_STAT_RATE_SPI_SHIFT);
/* wake the device with command "release powerdown NoID" */
write_csr(dd, ASIC_EEP_ADDR_CMD, CMD_RELEASE_POWERDOWN_NOID);
dd->eprom_available = true;
release_chip_resource(dd, CR_EPROM);
done_asic:
return ret;
}
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