1 /* 2 * Copyright(c) 2015, 2016 Intel Corporation. 3 * 4 * This file is provided under a dual BSD/GPLv2 license. When using or 5 * redistributing this file, you may do so under either license. 6 * 7 * GPL LICENSE SUMMARY 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of version 2 of the GNU General Public License as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * BSD LICENSE 19 * 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that the following conditions 22 * are met: 23 * 24 * - Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * - Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in 28 * the documentation and/or other materials provided with the 29 * distribution. 30 * - Neither the name of Intel Corporation nor the names of its 31 * contributors may be used to endorse or promote products derived 32 * from this software without specific prior written permission. 33 * 34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 45 * 46 */ 47 #include <linux/delay.h> 48 #include "hfi.h" 49 #include "common.h" 50 #include "eprom.h" 51 52 #define CMD_SHIFT 24 53 #define CMD_RELEASE_POWERDOWN_NOID ((0xab << CMD_SHIFT)) 54 55 /* controller interface speeds */ 56 #define EP_SPEED_FULL 0x2 /* full speed */ 57 58 /* 59 * How long to wait for the EPROM to become available, in ms. 60 * The spec 32 Mb EPROM takes around 40s to erase then write. 61 * Double it for safety. 62 */ 63 #define EPROM_TIMEOUT 80000 /* ms */ 64 /* 65 * Initialize the EPROM handler. 66 */ 67 int eprom_init(struct hfi1_devdata *dd) 68 { 69 int ret = 0; 70 71 /* only the discrete chip has an EPROM */ 72 if (dd->pcidev->device != PCI_DEVICE_ID_INTEL0) 73 return 0; 74 75 /* 76 * It is OK if both HFIs reset the EPROM as long as they don't 77 * do it at the same time. 78 */ 79 ret = acquire_chip_resource(dd, CR_EPROM, EPROM_TIMEOUT); 80 if (ret) { 81 dd_dev_err(dd, 82 "%s: unable to acquire EPROM resource, no EPROM support\n", 83 __func__); 84 goto done_asic; 85 } 86 87 /* reset EPROM to be sure it is in a good state */ 88 89 /* set reset */ 90 write_csr(dd, ASIC_EEP_CTL_STAT, ASIC_EEP_CTL_STAT_EP_RESET_SMASK); 91 /* clear reset, set speed */ 92 write_csr(dd, ASIC_EEP_CTL_STAT, 93 EP_SPEED_FULL << ASIC_EEP_CTL_STAT_RATE_SPI_SHIFT); 94 95 /* wake the device with command "release powerdown NoID" */ 96 write_csr(dd, ASIC_EEP_ADDR_CMD, CMD_RELEASE_POWERDOWN_NOID); 97 98 dd->eprom_available = true; 99 release_chip_resource(dd, CR_EPROM); 100 done_asic: 101 return ret; 102 } 103