// SPDX-License-Identifier: GPL-2.0+
/* Microchip Sparx5 Switch driver
*
* Copyright (c) 2023 Microchip Technology Inc. and its subsidiaries.
*/
#include "sparx5_main_regs.h"
#include "sparx5_main.h"
struct sparx5_sdlb_group sdlb_groups[SPX5_SDLB_GROUP_CNT] = {
{ SPX5_SDLB_GROUP_RATE_MAX, 8192 / 1, 64 }, /* 25 G */
{ 15000000000ULL, 8192 / 1, 64 }, /* 15 G */
{ 10000000000ULL, 8192 / 1, 64 }, /* 10 G */
{ 5000000000ULL, 8192 / 1, 64 }, /* 5 G */
{ 2500000000ULL, 8192 / 1, 64 }, /* 2.5 G */
{ 1000000000ULL, 8192 / 2, 64 }, /* 1 G */
{ 500000000ULL, 8192 / 2, 64 }, /* 500 M */
{ 100000000ULL, 8192 / 4, 64 }, /* 100 M */
{ 50000000ULL, 8192 / 4, 64 }, /* 50 M */
{ 5000000ULL, 8192 / 8, 64 } /* 5 M */
};
int sparx5_sdlb_clk_hz_get(struct sparx5 *sparx5)
{
u32 clk_per_100ps;
u64 clk_hz;
clk_per_100ps = HSCH_SYS_CLK_PER_100PS_GET(spx5_rd(sparx5,
HSCH_SYS_CLK_PER));
if (!clk_per_100ps)
clk_per_100ps = SPX5_CLK_PER_100PS_DEFAULT;
clk_hz = (10 * 1000 * 1000) / clk_per_100ps;
return clk_hz *= 1000;
}
static int sparx5_sdlb_pup_interval_get(struct sparx5 *sparx5, u32 max_token,
u64 max_rate)
{
u64 clk_hz;
clk_hz = sparx5_sdlb_clk_hz_get(sparx5);
return div64_u64((8 * clk_hz * max_token), max_rate);
}
int sparx5_sdlb_pup_token_get(struct sparx5 *sparx5, u32 pup_interval, u64 rate)
{
u64 clk_hz;
if (!rate)
return SPX5_SDLB_PUP_TOKEN_DISABLE;
clk_hz = sparx5_sdlb_clk_hz_get(sparx5);
return DIV64_U64_ROUND_UP((rate * pup_interval), (clk_hz * 8));
}
static void sparx5_sdlb_group_disable(struct sparx5 *sparx5, u32 group)
{
spx5_rmw(ANA_AC_SDLB_PUP_CTRL_PUP_ENA_SET(0),
ANA_AC_SDLB_PUP_CTRL_PUP_ENA, sparx5,
ANA_AC_SDLB_PUP_CTRL(group));
}
static void sparx5_sdlb_group_enable(struct sparx5 *sparx5, u32 group)
{
spx5_rmw(ANA_AC_SDLB_PUP_CTRL_PUP_ENA_SET(1),
ANA_AC_SDLB_PUP_CTRL_PUP_ENA, sparx5,
ANA_AC_SDLB_PUP_CTRL(group));
}
static u32 sparx5_sdlb_group_get_first(struct sparx5 *sparx5, u32 group)
{
u32 val;
val = spx5_rd(sparx5, ANA_AC_SDLB_XLB_START(group));
return ANA_AC_SDLB_XLB_START_LBSET_START_GET(val);
}
static u32 sparx5_sdlb_group_get_next(struct sparx5 *sparx5, u32 group,
u32 lb)
{
u32 val;
val = spx5_rd(sparx5, ANA_AC_SDLB_XLB_NEXT(lb));
return ANA_AC_SDLB_XLB_NEXT_LBSET_NEXT_GET(val);
}
static bool sparx5_sdlb_group_is_first(struct sparx5 *sparx5, u32 group,
u32 lb)
{
return lb == sparx5_sdlb_group_get_first(sparx5, group);
}
static bool sparx5_sdlb_group_is_last(struct sparx5 *sparx5, u32 group,
u32 lb)
{
return lb == sparx5_sdlb_group_get_next(sparx5, group, lb);
}
static bool sparx5_sdlb_group_is_empty(struct sparx5 *sparx5, u32 group)
{
u32 val;
val = spx5_rd(sparx5, ANA_AC_SDLB_PUP_CTRL(group));
return ANA_AC_SDLB_PUP_CTRL_PUP_ENA_GET(val) == 0;
}
static u32 sparx5_sdlb_group_get_last(struct sparx5 *sparx5, u32 group)
{
u32 itr, next;
itr = sparx5_sdlb_group_get_first(sparx5, group);
for (;;) {
next = sparx5_sdlb_group_get_next(sparx5, group, itr);
if (itr == next)
return itr;
itr = next;
}
}
static bool sparx5_sdlb_group_is_singular(struct sparx5 *sparx5, u32 group)
{
if (sparx5_sdlb_group_is_empty(sparx5, group))
return false;
return sparx5_sdlb_group_get_first(sparx5, group) ==
sparx5_sdlb_group_get_last(sparx5, group);
}
static int sparx5_sdlb_group_get_adjacent(struct sparx5 *sparx5, u32 group,
u32 idx, u32 *prev, u32 *next,
u32 *first)
{
u32 itr;
*first = sparx5_sdlb_group_get_first(sparx5, group);
*prev = *first;
*next = *first;
itr = *first;
for (;;) {
*next = sparx5_sdlb_group_get_next(sparx5, group, itr);
if (itr == idx)
return 0; /* Found it */
if (itr == *next)
return -EINVAL; /* Was not found */
*prev = itr;
itr = *next;
}
}
static int sparx5_sdlb_group_get_count(struct sparx5 *sparx5, u32 group)
{
u32 itr, next;
int count = 0;
itr = sparx5_sdlb_group_get_first(sparx5, group);
for (;;) {
next = sparx5_sdlb_group_get_next(sparx5, group, itr);
if (itr == next)
return count;
itr = next;
count++;
}
}
int sparx5_sdlb_group_get_by_rate(struct sparx5 *sparx5, u32 rate, u32 burst)
{
const struct sparx5_sdlb_group *group;
u64 rate_bps;
int i, count;
rate_bps = rate * 1000;
for (i = SPX5_SDLB_GROUP_CNT - 1; i >= 0; i--) {
group = &sdlb_groups[i];
count = sparx5_sdlb_group_get_count(sparx5, i);
/* Check that this group is not full.
* According to LB group configuration rules: the number of XLBs
* in a group must not exceed PUP_INTERVAL/4 - 1.
*/
if (count > ((group->pup_interval / 4) - 1))
continue;
if (rate_bps < group->max_rate)
return i;
}
return -ENOSPC;
}
int sparx5_sdlb_group_get_by_index(struct sparx5 *sparx5, u32 idx, u32 *group)
{
u32 itr, next;
int i;
for (i = 0; i < SPX5_SDLB_GROUP_CNT; i++) {
if (sparx5_sdlb_group_is_empty(sparx5, i))
continue;
itr = sparx5_sdlb_group_get_first(sparx5, i);
for (;;) {
next = sparx5_sdlb_group_get_next(sparx5, i, itr);
if (itr == idx) {
*group = i;
return 0; /* Found it */
}
if (itr == next)
break; /* Was not found */
itr = next;
}
}
return -EINVAL;
}
static int sparx5_sdlb_group_link(struct sparx5 *sparx5, u32 group, u32 idx,
u32 first, u32 next, bool empty)
{
/* Stop leaking */
sparx5_sdlb_group_disable(sparx5, group);
if (empty)
return 0;
/* Link insertion lb to next lb */
spx5_wr(ANA_AC_SDLB_XLB_NEXT_LBSET_NEXT_SET(next) |
ANA_AC_SDLB_XLB_NEXT_LBGRP_SET(group),
sparx5, ANA_AC_SDLB_XLB_NEXT(idx));
/* Set the first lb */
spx5_wr(ANA_AC_SDLB_XLB_START_LBSET_START_SET(first), sparx5,
ANA_AC_SDLB_XLB_START(group));
/* Start leaking */
sparx5_sdlb_group_enable(sparx5, group);
return 0;
};
int sparx5_sdlb_group_add(struct sparx5 *sparx5, u32 group, u32 idx)
{
u32 first, next;
/* We always add to head of the list */
first = idx;
if (sparx5_sdlb_group_is_empty(sparx5, group))
next = idx;
else
next = sparx5_sdlb_group_get_first(sparx5, group);
return sparx5_sdlb_group_link(sparx5, group, idx, first, next, false);
}
int sparx5_sdlb_group_del(struct sparx5 *sparx5, u32 group, u32 idx)
{
u32 first, next, prev;
bool empty = false;
if (sparx5_sdlb_group_get_adjacent(sparx5, group, idx, &prev, &next,
&first) < 0) {
pr_err("%s:%d Could not find idx: %d in group: %d", __func__,
__LINE__, idx, group);
return -EINVAL;
}
if (sparx5_sdlb_group_is_singular(sparx5, group)) {
empty = true;
} else if (sparx5_sdlb_group_is_last(sparx5, group, idx)) {
/* idx is removed, prev is now last */
idx = prev;
next = prev;
} else if (sparx5_sdlb_group_is_first(sparx5, group, idx)) {
/* idx is removed and points to itself, first is next */
first = next;
next = idx;
} else {
/* Next is not touched */
idx = prev;
}
return sparx5_sdlb_group_link(sparx5, group, idx, first, next, empty);
}
void sparx5_sdlb_group_init(struct sparx5 *sparx5, u64 max_rate, u32 min_burst,
u32 frame_size, u32 idx)
{
u32 thres_shift, mask = 0x01, power = 0;
struct sparx5_sdlb_group *group;
u64 max_token;
group = &sdlb_groups[idx];
/* Number of positions to right-shift LB's threshold value. */
while ((min_burst & mask) == 0) {
power++;
mask <<= 1;
}
thres_shift = SPX5_SDLB_2CYCLES_TYPE2_THRES_OFFSET - power;
max_token = (min_burst > SPX5_SDLB_PUP_TOKEN_MAX) ?
SPX5_SDLB_PUP_TOKEN_MAX :
min_burst;
group->pup_interval =
sparx5_sdlb_pup_interval_get(sparx5, max_token, max_rate);
group->frame_size = frame_size;
spx5_wr(ANA_AC_SDLB_PUP_INTERVAL_PUP_INTERVAL_SET(group->pup_interval),
sparx5, ANA_AC_SDLB_PUP_INTERVAL(idx));
spx5_wr(ANA_AC_SDLB_FRM_RATE_TOKENS_FRM_RATE_TOKENS_SET(frame_size),
sparx5, ANA_AC_SDLB_FRM_RATE_TOKENS(idx));
spx5_wr(ANA_AC_SDLB_LBGRP_MISC_THRES_SHIFT_SET(thres_shift), sparx5,
ANA_AC_SDLB_LBGRP_MISC(idx));
}
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