1 files changed, 73 insertions, 0 deletions

diff --git a/arch/mips/cavium-octeon/executive/cvmx-helper-errata.c b/arch/mips/cavium-octeon/executive/cvmx-helper-errata.c
new file mode 100644
index 000000000000..868659e64d4a
--- /dev/null
+++ b/arch/mips/cavium-octeon/executive/cvmx-helper-errata.c
@@ -0,0 +1,73 @@
+/***********************license start***************
+ * Author: Cavium Networks
+ *
+ * Contact: support@caviumnetworks.com
+ * This file is part of the OCTEON SDK
+ *
+ * Copyright (c) 2003-2008 Cavium Networks
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, Version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
+ * NONINFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * or visit http://www.gnu.org/licenses/.
+ *
+ * This file may also be available under a different license from Cavium.
+ * Contact Cavium Networks for more information
+ ***********************license end**************************************/
+
+/**
+ *
+ * Fixes and workaround for Octeon chip errata. This file
+ * contains functions called by cvmx-helper to workaround known
+ * chip errata. For the most part, code doesn't need to call
+ * these functions directly.
+ *
+ */
+#include <linux/module.h>
+
+#include <asm/octeon/octeon.h>
+
+#include <asm/octeon/cvmx-helper-jtag.h>
+
+/**
+ * Due to errata G-720, the 2nd order CDR circuit on CN52XX pass
+ * 1 doesn't work properly. The following code disables 2nd order
+ * CDR for the specified QLM.
+ *
+ * @qlm:    QLM to disable 2nd order CDR for.
+ */
+void __cvmx_helper_errata_qlm_disable_2nd_order_cdr(int qlm)
+{
+        int lane;
+        cvmx_helper_qlm_jtag_init();
+        /* We need to load all four lanes of the QLM, a total of 1072 bits */
+        for (lane = 0; lane < 4; lane++) {
+                /*
+                 * Each lane has 268 bits. We need to set
+                 * cfg_cdr_incx<67:64> = 3 and cfg_cdr_secord<77> =
+                 * 1. All other bits are zero. Bits go in LSB first,
+                 * so start off with the zeros for bits <63:0>.
+                 */
+                cvmx_helper_qlm_jtag_shift_zeros(qlm, 63 - 0 + 1);
+                /* cfg_cdr_incx<67:64>=3 */
+                cvmx_helper_qlm_jtag_shift(qlm, 67 - 64 + 1, 3);
+                /* Zeros for bits <76:68> */
+                cvmx_helper_qlm_jtag_shift_zeros(qlm, 76 - 68 + 1);
+                /* cfg_cdr_secord<77>=1 */
+                cvmx_helper_qlm_jtag_shift(qlm, 77 - 77 + 1, 1);
+                /* Zeros for bits <267:78> */
+                cvmx_helper_qlm_jtag_shift_zeros(qlm, 267 - 78 + 1);
+        }
+        cvmx_helper_qlm_jtag_update(qlm);
+}
+EXPORT_SYMBOL(__cvmx_helper_errata_qlm_disable_2nd_order_cdr);