| 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 | } |