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/*
* Copyright (c) 2013 Qualcomm Atheros, Inc.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <config.h>
#include <version.h>
#include <asm/regdef.h>
#include <asm/mipsregs.h>
#include <asm/addrspace.h>
#include <atheros.h>
.globl ath_ddr_tap_cal
.type ath_ddr_tap_cal, @function
.text
.align 4
ath_ddr_tap_cal:
li a0, 0xbd001f00
sw zero, 0x0(a0) // Place where the tap values are saved and used for SWEEP
sw zero, 0x4(a0) // Place where the number of passing taps are saved.
sw zero, 0x14(a0) // Place where the last pass tap value is stored
li a1, 0xaa55aa55 // Indicates that the First pass tap value is not found
sw a1, 0x10(a0) // Place where the First pass tap value is stored
nop
li a0, 0xb8060000 // RESET_BASE_ADDRESS
lw a1, 0x1c(a0) // Reading the RST_RESET_ADDRESS
li a2, 0x08000000 // Setting the RST_RESET_RTC_RESET
or a1, a1, a2
sw a1, 0x1c(a0)
li a3, 0xffffffff
xor a2, a2, a3
and a1, a1, a2
sw a1, 0x1c(a0) // Taking the RTC out of RESET
nop
li a0, 0xb8107000 // RTC_BASE_ADDRESS
li a1, 0x1
sw a1, 0x0040(a0) // RTC_SYNC_RESET_ADDRESS
li a2, 0x2
_poll_for_RTC_ON:
lw a1, 0x0044(a0) // RTC_SYNC_STATUS_ADDRESS
and a1, a2, a1
bne a1, a2, _poll_for_RTC_ON
_CHANGE_TAPS:
li t0, 0xbd001f00 // Read the current value of the TAP for programming
lw t1, 0x0(t0)
li t2, 0x00000000
or t3, t1, t2
li t0, 0xb8000000 // DDR_BASE_ADDRESS
sw t3, 0x1c(t0) // TAP_CONTROL_0_ADDRESS
sw t3, 0x20(t0) // TAP_CONTROL_1_ADDRESS
sw t3, 0x24(t0) // TAP_CONTROL_2_ADDRESS
sw t3, 0x28(t0) // TAP_CONTROL_3_ADDRESS
li t1, 0x00000010 // Running the test 8 times
sw t1, 0x0068(t0) // PERF_COMP_ADDR_1_ADDRESS
li t1, 0xfa5de83f // 4 Row Address Bits, 4 Column Address Bits, 2 BA bits
sw t1, 0x002c(t0) // PERF_MASK_ADDR_0_ADDRESS
li t1, 0x0000ffff
sw t1, 0x0070(t0) // PERF_COMP_AHB_GE0_1_ADDRESS
li t1, 0x0000ffff
sw t1, 0x0040(t0) // PERF_COMP_AHB_GE1_0_ADDRESS
li t1, 0x0000ffff
sw t1, 0x0078(t0) // PERF_COMP_AHB_GE1_1_ADDRESS
li t1, 0x0000ffff
sw t1, 0x0034(t0) // PERF_MASK_AHB_GE0_0_ADDRESS
li t1, 0x0000ffff
sw t1, 0x006c(t0) // PERF_MASK_AHB_GE0_1_ADDRESS
li t1, 0x0000ffff
sw t1, 0x003c(t0) // PERF_MASK_AHB_GE1_0_ADDRESS
li t1, 0x0000ffff
sw t1, 0x0074(t0) // PERF_MASK_AHB_GE1_1_ADDRESS
li t1, 0x0000ffff
sw t1, 0x0038(t0) // PERF_COMP_AHB_GE0_0_ADDRESS
li t1, 0x00000001
sw t1, 0x011c(t0) // DDR_BIST_ADDRESS
li t2, 0x1
_bist_done_poll:
lw t1, 0x0120(t0) // DDR_BIST_STATUS_ADDRESS
and t1, t1, t2
bne t1, t2, _bist_done_poll
lw t1, 0x0120(t0) // DDR_BIST_STATUS_ADDRESS
li t4, 0x000001fe
and t2, t1, t4
srl t2, t2, 0x1 // no. of Pass Runs
li t5, 0x00000000
sw t5, 0x011c(t0) //DDR_BIST_ADDRESS - Stop the DDR BIST test
li t5, 0x0001fe00
and t5, t5, t1
bnez t5, _iterate_tap // This is a redundant compare but nevertheless - Comparing the FAILS
lw t1, 0x0068(t0) // PERF_COMP_ADDR_1_ADDRESS
li t3, 0x000001fe
and t3, t3, t1
srl t3, t3, 0x1 // No. of runs in the config register.
bne t3, t2, _iterate_tap
pass_tap:
li t0, 0xbd001f00
lw t1, 0x4(t0)
addiu t1, t1, 0x1
sw t1, 0x4(t0)
li t0, 0xbd001f10
lw t1, 0x0(t0)
li t2, 0xaa55aa55
beq t1, t2, _first_pass
nop
li t0, 0xbd001f00
lw t1, 0x0(t0)
li t0, 0xbd001f10
sw t1, 0x4(t0)
nop
b _iterate_tap
nop
_first_pass:
li t0, 0xbd001f00
lw t1, 0x0(t0)
li t0, 0xbd001f10
sw t1, 0x0(t0)
sw t1, 0x4(t0)
nop
_iterate_tap:
li t0, 0xbd001f00
lw t1, 0x0(t0)
li t2, 0x3f
beq t1, t2, _STOP_TEST
nop
addiu t1, t1, 0x1
sw t1, 0x0(t0)
nop
b _CHANGE_TAPS
_STOP_TEST:
li t0, 0xbd001f00
lw t1, 0x4(t0)
bnez t1, _load_center_tap
nop
li t3, 0x8 // Default Tap to be used
b _load_tap_into_reg
_load_center_tap:
li t0, 0xbd001f10
lw t1, 0x0(t0)
lw t2, 0x4(t0)
add t3, t1, t2
srl t3, t3, 0x1
li t4, 0x3f
and t3, t3, t4
_load_tap_into_reg:
li t0, 0xb8000000
sw t3, 0x1c(t0) // TAP_CONTROL_0_ADDRESS
sw t3, 0x20(t0) // TAP_CONTROL_1_ADDRESS
sw t3, 0x24(t0) // TAP_CONTROL_2_ADDRESS
sw t3, 0x28(t0) // TAP_CONTROL_3_ADDRESS
jr ra
nop