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// SPDX-License-Identifier: GPL-2.0+
/* Microchip lan969x Switch driver
*
* Copyright (c) 2024 Microchip Technology Inc. and its subsidiaries.
*/
#include "lan969x.h"
#define LAN969X_DSM_CAL_DEVS_PER_TAXI 10
#define LAN969X_DSM_CAL_TAXIS 5
enum lan969x_dsm_cal_dev {
DSM_CAL_DEV_2G5,
DSM_CAL_DEV_5G,
DSM_CAL_DEV_10G,
DSM_CAL_DEV_OTHER, /* 1G or less */
DSM_CAL_DEV_MAX
};
/* Each entry in the following struct defines properties for a given speed
* (10G, 5G, 2.5G, or 1G or less).
*/
struct lan969x_dsm_cal_dev_speed {
/* Number of devices that requires this speed. */
u32 n_devs;
/* Array of devices that requires this speed. */
u32 devs[LAN969X_DSM_CAL_DEVS_PER_TAXI];
/* Number of slots required for one device running this speed. */
u32 n_slots;
/* Gap between two slots for one device running this speed. */
u32 gap;
};
static u32
lan969x_taxi_ports[LAN969X_DSM_CAL_TAXIS][LAN969X_DSM_CAL_DEVS_PER_TAXI] = {
{ 0, 4, 1, 2, 3, 5, 6, 7, 28, 29 },
{ 8, 12, 9, 13, 10, 11, 14, 15, 99, 99 },
{ 16, 20, 17, 21, 18, 19, 22, 23, 99, 99 },
{ 24, 25, 99, 99, 99, 99, 99, 99, 99, 99 },
{ 26, 27, 99, 99, 99, 99, 99, 99, 99, 99 }
};
static int lan969x_dsm_cal_idx_get(u32 *calendar, u32 cal_len, u32 *cal_idx)
{
if (*cal_idx >= cal_len)
return -EINVAL;
do {
if (calendar[*cal_idx] == SPX5_DSM_CAL_EMPTY)
return 0;
(*cal_idx)++;
} while (*cal_idx < cal_len);
return -ENOENT;
}
static enum lan969x_dsm_cal_dev lan969x_dsm_cal_get_dev(int speed)
{
return (speed == 10000 ? DSM_CAL_DEV_10G :
speed == 5000 ? DSM_CAL_DEV_5G :
speed == 2500 ? DSM_CAL_DEV_2G5 :
DSM_CAL_DEV_OTHER);
}
static int lan969x_dsm_cal_get_speed(enum lan969x_dsm_cal_dev dev)
{
return (dev == DSM_CAL_DEV_10G ? 10000 :
dev == DSM_CAL_DEV_5G ? 5000 :
dev == DSM_CAL_DEV_2G5 ? 2500 :
1000);
}
int lan969x_dsm_calendar_calc(struct sparx5 *sparx5, u32 taxi,
struct sparx5_calendar_data *data)
{
struct lan969x_dsm_cal_dev_speed dev_speeds[DSM_CAL_DEV_MAX] = {};
u32 cal_len, n_slots, taxi_bw, n_devs = 0, required_bw = 0;
struct lan969x_dsm_cal_dev_speed *speed;
int err;
/* Maximum bandwidth for this taxi */
taxi_bw = (128 * 1000000) / sparx5_clk_period(sparx5->coreclock);
memcpy(data->taxi_ports, &lan969x_taxi_ports[taxi],
LAN969X_DSM_CAL_DEVS_PER_TAXI * sizeof(u32));
for (int i = 0; i < LAN969X_DSM_CAL_DEVS_PER_TAXI; i++) {
u32 portno = data->taxi_ports[i];
enum sparx5_cal_bw bw;
bw = sparx5_get_port_cal_speed(sparx5, portno);
if (portno < sparx5->data->consts->n_ports_all)
data->taxi_speeds[i] = sparx5_cal_speed_to_value(bw);
else
data->taxi_speeds[i] = 0;
}
/* Determine the different port types (10G, 5G, 2.5G, <= 1G) in the
* this taxi map.
*/
for (int i = 0; i < LAN969X_DSM_CAL_DEVS_PER_TAXI; i++) {
u32 taxi_speed = data->taxi_speeds[i];
enum lan969x_dsm_cal_dev dev;
if (taxi_speed == 0)
continue;
required_bw += taxi_speed;
dev = lan969x_dsm_cal_get_dev(taxi_speed);
speed = &dev_speeds[dev];
speed->devs[speed->n_devs++] = i;
n_devs++;
}
if (required_bw > taxi_bw) {
pr_err("Required bandwidth: %u is higher than total taxi bandwidth: %u",
required_bw, taxi_bw);
return -EINVAL;
}
if (n_devs == 0) {
data->schedule[0] = SPX5_DSM_CAL_EMPTY;
return 0;
}
cal_len = n_devs;
/* Search for a calendar length that fits all active devices. */
while (cal_len < SPX5_DSM_CAL_LEN) {
u32 bw_per_slot = taxi_bw / cal_len;
n_slots = 0;
for (int i = 0; i < DSM_CAL_DEV_MAX; i++) {
speed = &dev_speeds[i];
if (speed->n_devs == 0)
continue;
required_bw = lan969x_dsm_cal_get_speed(i);
speed->n_slots = DIV_ROUND_UP(required_bw, bw_per_slot);
if (speed->n_slots)
speed->gap = DIV_ROUND_UP(cal_len,
speed->n_slots);
else
speed->gap = 0;
n_slots += speed->n_slots * speed->n_devs;
}
if (n_slots <= cal_len)
break; /* Found a suitable calendar length. */
/* Not good enough yet. */
cal_len = n_slots;
}
if (cal_len > SPX5_DSM_CAL_LEN) {
pr_err("Invalid length: %u for taxi: %u", cal_len, taxi);
return -EINVAL;
}
for (u32 i = 0; i < SPX5_DSM_CAL_LEN; i++)
data->schedule[i] = SPX5_DSM_CAL_EMPTY;
/* Place the remaining devices */
for (u32 i = 0; i < DSM_CAL_DEV_MAX; i++) {
speed = &dev_speeds[i];
for (u32 dev = 0; dev < speed->n_devs; dev++) {
u32 idx = 0;
for (n_slots = 0; n_slots < speed->n_slots; n_slots++) {
err = lan969x_dsm_cal_idx_get(data->schedule,
cal_len, &idx);
if (err)
return err;
data->schedule[idx] = speed->devs[dev];
idx += speed->gap;
}
}
}
return 0;
}
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