diff options
Diffstat (limited to 'arch/mips/cavium-octeon/executive/cvmx-helper-jtag.c')
| -rw-r--r-- | arch/mips/cavium-octeon/executive/cvmx-helper-jtag.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/arch/mips/cavium-octeon/executive/cvmx-helper-jtag.c b/arch/mips/cavium-octeon/executive/cvmx-helper-jtag.c new file mode 100644 index 00000000000..c1c54890bae --- /dev/null +++ b/arch/mips/cavium-octeon/executive/cvmx-helper-jtag.c @@ -0,0 +1,144 @@ + +/***********************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**************************************/ + +/** + * + * Helper utilities for qlm_jtag. + * + */ + +#include <asm/octeon/octeon.h> +#include <asm/octeon/cvmx-helper-jtag.h> + + +/** + * Initialize the internal QLM JTAG logic to allow programming + * of the JTAG chain by the cvmx_helper_qlm_jtag_*() functions. + * These functions should only be used at the direction of Cavium + * Networks. Programming incorrect values into the JTAG chain + * can cause chip damage. + */ +void cvmx_helper_qlm_jtag_init(void) +{ + union cvmx_ciu_qlm_jtgc jtgc; + uint32_t clock_div = 0; + uint32_t divisor = cvmx_sysinfo_get()->cpu_clock_hz / (25 * 1000000); + divisor = (divisor - 1) >> 2; + /* Convert the divisor into a power of 2 shift */ + while (divisor) { + clock_div++; + divisor = divisor >> 1; + } + + /* + * Clock divider for QLM JTAG operations. eclk is divided by + * 2^(CLK_DIV + 2) + */ + jtgc.u64 = 0; + jtgc.s.clk_div = clock_div; + jtgc.s.mux_sel = 0; + if (OCTEON_IS_MODEL(OCTEON_CN52XX)) + jtgc.s.bypass = 0x3; + else + jtgc.s.bypass = 0xf; + cvmx_write_csr(CVMX_CIU_QLM_JTGC, jtgc.u64); + cvmx_read_csr(CVMX_CIU_QLM_JTGC); +} + +/** + * Write up to 32bits into the QLM jtag chain. Bits are shifted + * into the MSB and out the LSB, so you should shift in the low + * order bits followed by the high order bits. The JTAG chain is + * 4 * 268 bits long, or 1072. + * + * @qlm: QLM to shift value into + * @bits: Number of bits to shift in (1-32). + * @data: Data to shift in. Bit 0 enters the chain first, followed by + * bit 1, etc. + * + * Returns The low order bits of the JTAG chain that shifted out of the + * circle. + */ +uint32_t cvmx_helper_qlm_jtag_shift(int qlm, int bits, uint32_t data) +{ + union cvmx_ciu_qlm_jtgd jtgd; + jtgd.u64 = 0; + jtgd.s.shift = 1; + jtgd.s.shft_cnt = bits - 1; + jtgd.s.shft_reg = data; + if (!OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X)) + jtgd.s.select = 1 << qlm; + cvmx_write_csr(CVMX_CIU_QLM_JTGD, jtgd.u64); + do { + jtgd.u64 = cvmx_read_csr(CVMX_CIU_QLM_JTGD); + } while (jtgd.s.shift); + return jtgd.s.shft_reg >> (32 - bits); +} + +/** + * Shift long sequences of zeros into the QLM JTAG chain. It is + * common to need to shift more than 32 bits of zeros into the + * chain. This function is a convience wrapper around + * cvmx_helper_qlm_jtag_shift() to shift more than 32 bits of + * zeros at a time. + * + * @qlm: QLM to shift zeros into + * @bits: + */ +void cvmx_helper_qlm_jtag_shift_zeros(int qlm, int bits) +{ + while (bits > 0) { + int n = bits; + if (n > 32) + n = 32; + cvmx_helper_qlm_jtag_shift(qlm, n, 0); + bits -= n; + } +} + +/** + * Program the QLM JTAG chain into all lanes of the QLM. You must + * have already shifted in 268*4, or 1072 bits into the JTAG + * chain. Updating invalid values can possibly cause chip damage. + * + * @qlm: QLM to program + */ +void cvmx_helper_qlm_jtag_update(int qlm) +{ + union cvmx_ciu_qlm_jtgd jtgd; + + /* Update the new data */ + jtgd.u64 = 0; + jtgd.s.update = 1; + if (!OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X)) + jtgd.s.select = 1 << qlm; + cvmx_write_csr(CVMX_CIU_QLM_JTGD, jtgd.u64); + do { + jtgd.u64 = cvmx_read_csr(CVMX_CIU_QLM_JTGD); + } while (jtgd.s.update); +} |