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u-boot/drivers/ddr/marvell/a38x/ddr3_training_hw_algo.c
Chris Packham 247c80d6b8 mv_ddr: ddr3: only use active chip-selects when tuning ODT 
Inactive chip-selects will give invalid values for read_sample so don't
consider them when trying to determine the overall min/max read sample.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>

[https://github.com/MarvellEmbeddedProcessors/mv-ddr-marvell/pull/18]
Signed-off-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
2019-03-19 09:22:05 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) Marvell International Ltd. and its affiliates
*/
#include "ddr3_init.h"
#include "mv_ddr_regs.h"
#define VREF_INITIAL_STEP 3
#define VREF_SECOND_STEP 1
#define VREF_MAX_INDEX 7
#define MAX_VALUE (1024 - 1)
#define MIN_VALUE (-MAX_VALUE)
#define GET_RD_SAMPLE_DELAY(data, cs) ((data >> rd_sample_mask[cs]) & 0xf)
u32 ca_delay;
int ddr3_tip_centr_skip_min_win_check = 0;
u8 current_vref[MAX_BUS_NUM][MAX_INTERFACE_NUM];
u8 last_vref[MAX_BUS_NUM][MAX_INTERFACE_NUM];
u16 current_valid_window[MAX_BUS_NUM][MAX_INTERFACE_NUM];
u16 last_valid_window[MAX_BUS_NUM][MAX_INTERFACE_NUM];
u8 lim_vref[MAX_BUS_NUM][MAX_INTERFACE_NUM];
u8 interface_state[MAX_INTERFACE_NUM];
u8 vref_window_size[MAX_INTERFACE_NUM][MAX_BUS_NUM];
u8 vref_window_size_th = 12;
static u8 pup_st[MAX_BUS_NUM][MAX_INTERFACE_NUM];
static u32 rd_sample_mask[] = {
0,
8,
16,
24
};
#define VREF_STEP_1 0
#define VREF_STEP_2 1
#define VREF_CONVERGE 2
/*
* ODT additional timing
*/
int ddr3_tip_write_additional_odt_setting(u32 dev_num, u32 if_id)
{
u32 cs_num = 0, max_read_sample = 0, min_read_sample = 0x1f;
u32 data_read[MAX_INTERFACE_NUM] = { 0 };
u32 read_sample[MAX_CS_NUM];
u32 val;
u32 pup_index;
int max_phase = MIN_VALUE, current_phase;
enum hws_access_type access_type = ACCESS_TYPE_UNICAST;
u32 octets_per_if_num = ddr3_tip_dev_attr_get(dev_num, MV_ATTR_OCTET_PER_INTERFACE);
unsigned int max_cs = mv_ddr_cs_num_get();
CHECK_STATUS(ddr3_tip_if_write(dev_num, access_type, if_id,
DUNIT_ODT_CTRL_REG,
0 << 8, 0x3 << 8));
CHECK_STATUS(ddr3_tip_if_read(dev_num, access_type, if_id,
RD_DATA_SMPL_DLYS_REG,
data_read, MASK_ALL_BITS));
val = data_read[if_id];
for (cs_num = 0; cs_num < max_cs; cs_num++) {
read_sample[cs_num] = GET_RD_SAMPLE_DELAY(val, cs_num);
/* find maximum of read_samples */
if (read_sample[cs_num] >= max_read_sample) {
if (read_sample[cs_num] == max_read_sample)
max_phase = MIN_VALUE;
else
max_read_sample = read_sample[cs_num];
for (pup_index = 0;
pup_index < octets_per_if_num;
pup_index++) {
CHECK_STATUS(ddr3_tip_bus_read
(dev_num, if_id,
ACCESS_TYPE_UNICAST, pup_index,
DDR_PHY_DATA,
RL_PHY_REG(cs_num),
&val));
current_phase = ((int)val & 0xe0) >> 6;
if (current_phase >= max_phase)
max_phase = current_phase;
}
}
/* find minimum */
if (read_sample[cs_num] < min_read_sample)
min_read_sample = read_sample[cs_num];
}
min_read_sample = min_read_sample - 1;
max_read_sample = max_read_sample + 4 + (max_phase + 1) / 2 + 1;
if (min_read_sample >= 0xf)
min_read_sample = 0xf;
if (max_read_sample >= 0x1f)
max_read_sample = 0x1f;
CHECK_STATUS(ddr3_tip_if_write(dev_num, access_type, if_id,
DDR_ODT_TIMING_LOW_REG,
((min_read_sample - 1) << 12),
0xf << 12));
CHECK_STATUS(ddr3_tip_if_write(dev_num, access_type, if_id,
DDR_ODT_TIMING_LOW_REG,
(max_read_sample << 16),
0x1f << 16));
return MV_OK;
}
int get_valid_win_rx(u32 dev_num, u32 if_id, u8 res[4])
{
u32 reg_pup = RESULT_PHY_REG;
u32 reg_data;
u32 cs_num;
int i;
cs_num = 0;
/* TBD */
reg_pup += cs_num;
for (i = 0; i < 4; i++) {
CHECK_STATUS(ddr3_tip_bus_read(dev_num, if_id,
ACCESS_TYPE_UNICAST, i,
DDR_PHY_DATA, reg_pup,
&reg_data));
res[i] = (reg_data >> RESULT_PHY_RX_OFFS) & 0x1f;
}
return 0;
}
/*
* This algorithm deals with the vertical optimum from Voltage point of view
* of the sample signal.
* Voltage sample point can improve the Eye / window size of the bit and the
* pup.
* The problem is that it is tune for all DQ the same so there isn't any
* PBS like code.
* It is more like centralization.
* But because we don't have The training SM support we do it a bit more
* smart search to save time.
*/
int ddr3_tip_vref(u32 dev_num)
{
/*
* The Vref register have non linear order. Need to check what will be
* in future projects.
*/
u32 vref_map[8] = {
1, 2, 3, 4, 5, 6, 7, 0
};
/* State and parameter definitions */
u32 initial_step = VREF_INITIAL_STEP;
/* need to be assign with minus ????? */
u32 second_step = VREF_SECOND_STEP;
u32 algo_run_flag = 0, currrent_vref = 0;
u32 while_count = 0;
u32 pup = 0, if_id = 0, num_pup = 0, rep = 0;
u32 val = 0;
u32 reg_addr = 0xa8;
u32 copy_start_pattern, copy_end_pattern;
enum hws_result *flow_result = ddr3_tip_get_result_ptr(training_stage);
u8 res[4];
u32 octets_per_if_num = ddr3_tip_dev_attr_get(dev_num, MV_ATTR_OCTET_PER_INTERFACE);
struct mv_ddr_topology_map *tm = mv_ddr_topology_map_get();
CHECK_STATUS(ddr3_tip_special_rx(dev_num));
/* save start/end pattern */
copy_start_pattern = start_pattern;
copy_end_pattern = end_pattern;
/* set vref as centralization pattern */
start_pattern = PATTERN_VREF;
end_pattern = PATTERN_VREF;
/* init params */
for (if_id = 0; if_id < MAX_INTERFACE_NUM; if_id++) {
VALIDATE_IF_ACTIVE(tm->if_act_mask, if_id);
for (pup = 0;
pup < octets_per_if_num; pup++) {
current_vref[pup][if_id] = 0;
last_vref[pup][if_id] = 0;
lim_vref[pup][if_id] = 0;
current_valid_window[pup][if_id] = 0;
last_valid_window[pup][if_id] = 0;
if (vref_window_size[if_id][pup] >
vref_window_size_th) {
pup_st[pup][if_id] = VREF_CONVERGE;
DEBUG_TRAINING_HW_ALG(
DEBUG_LEVEL_INFO,
("VREF config, IF[ %d ]pup[ %d ] - Vref tune not requered (%d)\n",
if_id, pup, __LINE__));
} else {
pup_st[pup][if_id] = VREF_STEP_1;
CHECK_STATUS(ddr3_tip_bus_read
(dev_num, if_id,
ACCESS_TYPE_UNICAST, pup,
DDR_PHY_DATA, reg_addr, &val));
CHECK_STATUS(ddr3_tip_bus_write
(dev_num, ACCESS_TYPE_UNICAST,
if_id, ACCESS_TYPE_UNICAST,
pup, DDR_PHY_DATA, reg_addr,
(val & (~0xf)) | vref_map[0]));
DEBUG_TRAINING_HW_ALG(
DEBUG_LEVEL_INFO,
("VREF config, IF[ %d ]pup[ %d ] - Vref = %X (%d)\n",
if_id, pup,
(val & (~0xf)) | vref_map[0],
__LINE__));
}
}
interface_state[if_id] = 0;
}
/* TODO: Set number of active interfaces */
num_pup = octets_per_if_num * MAX_INTERFACE_NUM;
while ((algo_run_flag <= num_pup) & (while_count < 10)) {
while_count++;
for (rep = 1; rep < 4; rep++) {
ddr3_tip_centr_skip_min_win_check = 1;
ddr3_tip_centralization_rx(dev_num);
ddr3_tip_centr_skip_min_win_check = 0;
/* Read Valid window results only for non converge pups */
for (if_id = 0; if_id < MAX_INTERFACE_NUM; if_id++) {
VALIDATE_IF_ACTIVE(tm->if_act_mask, if_id);
if (interface_state[if_id] != 4) {
get_valid_win_rx(dev_num, if_id, res);
for (pup = 0;
pup < octets_per_if_num;
pup++) {
VALIDATE_BUS_ACTIVE
(tm->bus_act_mask, pup);
if (pup_st[pup]
[if_id] ==
VREF_CONVERGE)
continue;
current_valid_window[pup]
[if_id] =
(current_valid_window[pup]
[if_id] * (rep - 1) +
1000 * res[pup]) / rep;
}
}
}
}
for (if_id = 0; if_id < MAX_INTERFACE_NUM; if_id++) {
VALIDATE_IF_ACTIVE(tm->if_act_mask, if_id);
DEBUG_TRAINING_HW_ALG(
DEBUG_LEVEL_TRACE,
("current_valid_window: IF[ %d ] - ", if_id));
for (pup = 0;
pup < octets_per_if_num; pup++) {
VALIDATE_BUS_ACTIVE(tm->bus_act_mask, pup);
DEBUG_TRAINING_HW_ALG(DEBUG_LEVEL_TRACE,
("%d ",
current_valid_window
[pup][if_id]));
}
DEBUG_TRAINING_HW_ALG(DEBUG_LEVEL_TRACE, ("\n"));
}
/* Compare results and respond as function of state */
for (if_id = 0; if_id < MAX_INTERFACE_NUM; if_id++) {
VALIDATE_IF_ACTIVE(tm->if_act_mask, if_id);
for (pup = 0;
pup < octets_per_if_num; pup++) {
VALIDATE_BUS_ACTIVE(tm->bus_act_mask, pup);
DEBUG_TRAINING_HW_ALG(DEBUG_LEVEL_TRACE,
("I/F[ %d ], pup[ %d ] STATE #%d (%d)\n",
if_id, pup,
pup_st[pup]
[if_id], __LINE__));
if (pup_st[pup][if_id] == VREF_CONVERGE)
continue;
DEBUG_TRAINING_HW_ALG(DEBUG_LEVEL_TRACE,
("I/F[ %d ], pup[ %d ] CHECK progress - Current %d Last %d, limit VREF %d (%d)\n",
if_id, pup,
current_valid_window[pup]
[if_id],
last_valid_window[pup]
[if_id], lim_vref[pup]
[if_id], __LINE__));
/*
* The -1 is for solution resolution +/- 1 tap
* of ADLL
*/
if (current_valid_window[pup][if_id] + 200 >=
(last_valid_window[pup][if_id])) {
if (pup_st[pup][if_id] == VREF_STEP_1) {
/*
* We stay in the same state and
* step just update the window
* size (take the max) and Vref
*/
if (current_vref[pup]
[if_id] == VREF_MAX_INDEX) {
/*
* If we step to the end
* and didn't converge
* to some particular
* better Vref value
* define the pup as
* converge and step
* back to nominal
* Vref.
*/
pup_st[pup]
[if_id] =
VREF_CONVERGE;
algo_run_flag++;
interface_state
[if_id]++;
DEBUG_TRAINING_HW_ALG
(DEBUG_LEVEL_TRACE,
("I/F[ %d ], pup[ %d ] VREF_CONVERGE - Vref = %X (%d)\n",
if_id, pup,
current_vref[pup]
[if_id],
__LINE__));
} else {
/* continue to update the Vref index */
current_vref[pup]
[if_id] =
((current_vref[pup]
[if_id] +
initial_step) >
VREF_MAX_INDEX) ?
VREF_MAX_INDEX
: (current_vref[pup]
[if_id] +
initial_step);
if (current_vref[pup]
[if_id] ==
VREF_MAX_INDEX) {
pup_st[pup]
[if_id]
=
VREF_STEP_2;
}
lim_vref[pup]
[if_id] =
last_vref[pup]
[if_id] =
current_vref[pup]
[if_id];
}
last_valid_window[pup]
[if_id] =
GET_MAX(current_valid_window
[pup][if_id],
last_valid_window
[pup]
[if_id]);
/* update the Vref for next stage */
currrent_vref =
current_vref[pup]
[if_id];
CHECK_STATUS
(ddr3_tip_bus_read
(dev_num, if_id,
ACCESS_TYPE_UNICAST, pup,
DDR_PHY_DATA, reg_addr,
&val));
CHECK_STATUS
(ddr3_tip_bus_write
(dev_num,
ACCESS_TYPE_UNICAST,
if_id,
ACCESS_TYPE_UNICAST, pup,
DDR_PHY_DATA, reg_addr,
(val & (~0xf)) |
vref_map[currrent_vref]));
DEBUG_TRAINING_HW_ALG
(DEBUG_LEVEL_TRACE,
("VREF config, IF[ %d ]pup[ %d ] - Vref = %X (%d)\n",
if_id, pup,
(val & (~0xf)) |
vref_map[currrent_vref],
__LINE__));
} else if (pup_st[pup][if_id]
== VREF_STEP_2) {
/*
* We keep on search back with
* the same step size.
*/
last_valid_window[pup]
[if_id] =
GET_MAX(current_valid_window
[pup][if_id],
last_valid_window
[pup]
[if_id]);
last_vref[pup][if_id] =
current_vref[pup]
[if_id];
/* we finish all search space */
if ((current_vref[pup]
[if_id] - second_step) == lim_vref[pup][if_id]) {
/*
* If we step to the end
* and didn't converge
* to some particular
* better Vref value
* define the pup as
* converge and step
* back to nominal
* Vref.
*/
pup_st[pup]
[if_id] =
VREF_CONVERGE;
algo_run_flag++;
interface_state
[if_id]++;
current_vref[pup]
[if_id] =
(current_vref[pup]
[if_id] -
second_step);
DEBUG_TRAINING_HW_ALG
(DEBUG_LEVEL_TRACE,
("I/F[ %d ], pup[ %d ] VREF_CONVERGE - Vref = %X (%d)\n",
if_id, pup,
current_vref[pup]
[if_id],
__LINE__));
} else
/* we finish all search space */
if (current_vref[pup]
[if_id] ==
lim_vref[pup]
[if_id]) {
/*
* If we step to the end
* and didn't converge
* to some particular
* better Vref value
* define the pup as
* converge and step
* back to nominal
* Vref.
*/
pup_st[pup]
[if_id] =
VREF_CONVERGE;
algo_run_flag++;
interface_state
[if_id]++;
DEBUG_TRAINING_HW_ALG
(DEBUG_LEVEL_TRACE,
("I/F[ %d ], pup[ %d ] VREF_CONVERGE - Vref = %X (%d)\n",
if_id, pup,
current_vref[pup]
[if_id],
__LINE__));
} else {
current_vref[pup]
[if_id] =
current_vref[pup]
[if_id] -
second_step;
}
/* Update the Vref for next stage */
currrent_vref =
current_vref[pup]
[if_id];
CHECK_STATUS
(ddr3_tip_bus_read
(dev_num, if_id,
ACCESS_TYPE_UNICAST, pup,
DDR_PHY_DATA, reg_addr,
&val));
CHECK_STATUS
(ddr3_tip_bus_write
(dev_num,
ACCESS_TYPE_UNICAST,
if_id,
ACCESS_TYPE_UNICAST, pup,
DDR_PHY_DATA, reg_addr,
(val & (~0xf)) |
vref_map[currrent_vref]));
DEBUG_TRAINING_HW_ALG
(DEBUG_LEVEL_TRACE,
("VREF config, IF[ %d ]pup[ %d ] - Vref = %X (%d)\n",
if_id, pup,
(val & (~0xf)) |
vref_map[currrent_vref],
__LINE__));
}
} else {
/* we change state and change step */
if (pup_st[pup][if_id] == VREF_STEP_1) {
pup_st[pup][if_id] =
VREF_STEP_2;
lim_vref[pup][if_id] =
current_vref[pup]
[if_id] - initial_step;
last_valid_window[pup]
[if_id] =
current_valid_window[pup]
[if_id];
last_vref[pup][if_id] =
current_vref[pup]
[if_id];
current_vref[pup][if_id] =
last_vref[pup][if_id] -
second_step;
/* Update the Vref for next stage */
CHECK_STATUS
(ddr3_tip_bus_read
(dev_num, if_id,
ACCESS_TYPE_UNICAST, pup,
DDR_PHY_DATA, reg_addr,
&val));
CHECK_STATUS
(ddr3_tip_bus_write
(dev_num,
ACCESS_TYPE_UNICAST,
if_id,
ACCESS_TYPE_UNICAST, pup,
DDR_PHY_DATA, reg_addr,
(val & (~0xf)) |
vref_map[current_vref[pup]
[if_id]]));
DEBUG_TRAINING_HW_ALG
(DEBUG_LEVEL_TRACE,
("VREF config, IF[ %d ]pup[ %d ] - Vref = %X (%d)\n",
if_id, pup,
(val & (~0xf)) |
vref_map[current_vref[pup]
[if_id]],
__LINE__));
} else if (pup_st[pup][if_id] == VREF_STEP_2) {
/*
* The last search was the max
* point set value and exit
*/
CHECK_STATUS
(ddr3_tip_bus_read
(dev_num, if_id,
ACCESS_TYPE_UNICAST, pup,
DDR_PHY_DATA, reg_addr,
&val));
CHECK_STATUS
(ddr3_tip_bus_write
(dev_num,
ACCESS_TYPE_UNICAST,
if_id,
ACCESS_TYPE_UNICAST, pup,
DDR_PHY_DATA, reg_addr,
(val & (~0xf)) |
vref_map[last_vref[pup]
[if_id]]));
DEBUG_TRAINING_HW_ALG
(DEBUG_LEVEL_TRACE,
("VREF config, IF[ %d ]pup[ %d ] - Vref = %X (%d)\n",
if_id, pup,
(val & (~0xf)) |
vref_map[last_vref[pup]
[if_id]],
__LINE__));
pup_st[pup][if_id] =
VREF_CONVERGE;
algo_run_flag++;
interface_state[if_id]++;
DEBUG_TRAINING_HW_ALG
(DEBUG_LEVEL_TRACE,
("I/F[ %d ], pup[ %d ] VREF_CONVERGE - Vref = %X (%d)\n",
if_id, pup,
current_vref[pup]
[if_id], __LINE__));
}
}
}
}
}
for (if_id = 0; if_id < MAX_INTERFACE_NUM; if_id++) {
VALIDATE_IF_ACTIVE(tm->if_act_mask, if_id);
for (pup = 0;
pup < octets_per_if_num; pup++) {
VALIDATE_BUS_ACTIVE(tm->bus_act_mask, pup);
CHECK_STATUS(ddr3_tip_bus_read
(dev_num, if_id,
ACCESS_TYPE_UNICAST, pup,
DDR_PHY_DATA, reg_addr, &val));
DEBUG_TRAINING_HW_ALG(
DEBUG_LEVEL_INFO,
("FINAL values: I/F[ %d ], pup[ %d ] - Vref = %X (%d)\n",
if_id, pup, val, __LINE__));
}
}
flow_result[if_id] = TEST_SUCCESS;
/* restore start/end pattern */
start_pattern = copy_start_pattern;
end_pattern = copy_end_pattern;
return 0;
}
/*
* CK/CA Delay
*/
int ddr3_tip_cmd_addr_init_delay(u32 dev_num, u32 adll_tap)
{
u32 if_id = 0;
u32 ck_num_adll_tap = 0, ca_num_adll_tap = 0, data = 0;
struct mv_ddr_topology_map *tm = mv_ddr_topology_map_get();
/*
* ck_delay_table is delaying the of the clock signal only.
* (to overcome timing issues between_c_k & command/address signals)
*/
/*
* ca_delay is delaying the of the entire command & Address signals
* (include Clock signal to overcome DGL error on the Clock versus
* the DQS).
*/
/* Calc ADLL Tap */
if (ck_delay == PARAM_UNDEFINED)
DEBUG_TRAINING_HW_ALG(
DEBUG_LEVEL_ERROR,
("ERROR: ck_delay is not initialized!\n"));
for (if_id = 0; if_id <= MAX_INTERFACE_NUM - 1; if_id++) {
VALIDATE_IF_ACTIVE(tm->if_act_mask, if_id);
/* Calc delay ps in ADLL tap */
ck_num_adll_tap = ck_delay / adll_tap;
ca_num_adll_tap = ca_delay / adll_tap;
data = (ck_num_adll_tap & 0x3f) +
((ca_num_adll_tap & 0x3f) << 10);
/*
* Set the ADLL number to the CK ADLL for Interfaces for
* all Pup
*/
DEBUG_TRAINING_HW_ALG(
DEBUG_LEVEL_TRACE,
("ck_num_adll_tap %d ca_num_adll_tap %d adll_tap %d\n",
ck_num_adll_tap, ca_num_adll_tap, adll_tap));
CHECK_STATUS(ddr3_tip_bus_write(dev_num, ACCESS_TYPE_UNICAST,
if_id, ACCESS_TYPE_MULTICAST,
PARAM_NOT_CARE, DDR_PHY_CONTROL,
0x0, data));
}
return MV_OK;
}
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