David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 1 | /***********************license start*************** |
| 2 | * Author: Cavium Networks |
| 3 | * |
| 4 | * Contact: support@caviumnetworks.com |
| 5 | * This file is part of the OCTEON SDK |
| 6 | * |
| 7 | * Copyright (c) 2003-2008 Cavium Networks |
| 8 | * |
| 9 | * This file is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License, Version 2, as |
| 11 | * published by the Free Software Foundation. |
| 12 | * |
| 13 | * This file is distributed in the hope that it will be useful, but |
| 14 | * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty |
| 15 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or |
| 16 | * NONINFRINGEMENT. See the GNU General Public License for more |
| 17 | * details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this file; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | * or visit http://www.gnu.org/licenses/. |
| 23 | * |
| 24 | * This file may also be available under a different license from Cavium. |
| 25 | * Contact Cavium Networks for more information |
| 26 | ***********************license end**************************************/ |
| 27 | |
| 28 | /** |
| 29 | * |
| 30 | * Fixes and workaround for Octeon chip errata. This file |
| 31 | * contains functions called by cvmx-helper to workaround known |
| 32 | * chip errata. For the most part, code doesn't need to call |
| 33 | * these functions directly. |
| 34 | * |
| 35 | */ |
David Daney | 38295fb | 2009-05-05 17:35:20 -0700 | [diff] [blame] | 36 | #include <linux/module.h> |
| 37 | |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 38 | #include <asm/octeon/octeon.h> |
| 39 | |
| 40 | #include <asm/octeon/cvmx-helper-jtag.h> |
| 41 | |
| 42 | /** |
| 43 | * Due to errata G-720, the 2nd order CDR circuit on CN52XX pass |
| 44 | * 1 doesn't work properly. The following code disables 2nd order |
| 45 | * CDR for the specified QLM. |
| 46 | * |
| 47 | * @qlm: QLM to disable 2nd order CDR for. |
| 48 | */ |
| 49 | void __cvmx_helper_errata_qlm_disable_2nd_order_cdr(int qlm) |
| 50 | { |
| 51 | int lane; |
| 52 | cvmx_helper_qlm_jtag_init(); |
| 53 | /* We need to load all four lanes of the QLM, a total of 1072 bits */ |
| 54 | for (lane = 0; lane < 4; lane++) { |
| 55 | /* |
| 56 | * Each lane has 268 bits. We need to set |
| 57 | * cfg_cdr_incx<67:64> = 3 and cfg_cdr_secord<77> = |
| 58 | * 1. All other bits are zero. Bits go in LSB first, |
| 59 | * so start off with the zeros for bits <63:0>. |
| 60 | */ |
| 61 | cvmx_helper_qlm_jtag_shift_zeros(qlm, 63 - 0 + 1); |
| 62 | /* cfg_cdr_incx<67:64>=3 */ |
| 63 | cvmx_helper_qlm_jtag_shift(qlm, 67 - 64 + 1, 3); |
| 64 | /* Zeros for bits <76:68> */ |
| 65 | cvmx_helper_qlm_jtag_shift_zeros(qlm, 76 - 68 + 1); |
| 66 | /* cfg_cdr_secord<77>=1 */ |
| 67 | cvmx_helper_qlm_jtag_shift(qlm, 77 - 77 + 1, 1); |
| 68 | /* Zeros for bits <267:78> */ |
| 69 | cvmx_helper_qlm_jtag_shift_zeros(qlm, 267 - 78 + 1); |
| 70 | } |
| 71 | cvmx_helper_qlm_jtag_update(qlm); |
| 72 | } |
David Daney | 38295fb | 2009-05-05 17:35:20 -0700 | [diff] [blame] | 73 | EXPORT_SYMBOL(__cvmx_helper_errata_qlm_disable_2nd_order_cdr); |