linux/drivers/infiniband/hw/hfi1/platform.c

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright(c) 2015, 2016 Intel Corporation.
 */

#include <linux/firmware.h>

#include "hfi.h"
#include "efivar.h"
#include "eprom.h"

#define DEFAULT_PLATFORM_CONFIG_NAME …

static int validate_scratch_checksum(struct hfi1_devdata *dd)
{ … }

static void save_platform_config_fields(struct hfi1_devdata *dd)
{ … }

void get_platform_config(struct hfi1_devdata *dd)
{ … }

void free_platform_config(struct hfi1_devdata *dd)
{ … }

void get_port_type(struct hfi1_pportdata *ppd)
{ … }

int set_qsfp_tx(struct hfi1_pportdata *ppd, int on)
{ … }

static int qual_power(struct hfi1_pportdata *ppd)
{ … }

static int qual_bitrate(struct hfi1_pportdata *ppd)
{ … }

static int set_qsfp_high_power(struct hfi1_pportdata *ppd)
{ … }

static void apply_rx_cdr(struct hfi1_pportdata *ppd,
			 u32 rx_preset_index,
			 u8 *cdr_ctrl_byte)
{ … }

static void apply_tx_cdr(struct hfi1_pportdata *ppd,
			 u32 tx_preset_index,
			 u8 *cdr_ctrl_byte)
{ … }

static void apply_cdr_settings(
		struct hfi1_pportdata *ppd, u32 rx_preset_index,
		u32 tx_preset_index)
{ … }

static void apply_tx_eq_auto(struct hfi1_pportdata *ppd)
{ … }

static void apply_tx_eq_prog(struct hfi1_pportdata *ppd, u32 tx_preset_index)
{ … }

static void apply_rx_eq_emp(struct hfi1_pportdata *ppd, u32 rx_preset_index)
{ … }

static void apply_eq_settings(struct hfi1_pportdata *ppd,
			      u32 rx_preset_index, u32 tx_preset_index)
{ … }

static void apply_rx_amplitude_settings(
		struct hfi1_pportdata *ppd, u32 rx_preset_index,
		u32 tx_preset_index)
{ … }

#define OPA_INVALID_INDEX …

static void apply_tx_lanes(struct hfi1_pportdata *ppd, u8 field_id,
			   u32 config_data, const char *message)
{ … }

/*
 * Return a special SerDes setting for low power AOC cables.  The power class
 * threshold and setting being used were all found by empirical testing.
 *
 * Summary of the logic:
 *
 * if (QSFP and QSFP_TYPE == AOC and QSFP_POWER_CLASS < 4)
 *     return 0xe
 * return 0; // leave at default
 */
static u8 aoc_low_power_setting(struct hfi1_pportdata *ppd)
{ … }

static void apply_tunings(
		struct hfi1_pportdata *ppd, u32 tx_preset_index,
		u8 tuning_method, u32 total_atten, u8 limiting_active)
{ … }

/* Must be holding the QSFP i2c resource */
static int tune_active_qsfp(struct hfi1_pportdata *ppd, u32 *ptr_tx_preset,
			    u32 *ptr_rx_preset, u32 *ptr_total_atten)
{ … }

static int tune_qsfp(struct hfi1_pportdata *ppd,
		     u32 *ptr_tx_preset, u32 *ptr_rx_preset,
		     u8 *ptr_tuning_method, u32 *ptr_total_atten)
{ … }

/*
 * This function communicates its success or failure via ppd->driver_link_ready
 * Thus, it depends on its association with start_link(...) which checks
 * driver_link_ready before proceeding with the link negotiation and
 * initialization process.
 */
void tune_serdes(struct hfi1_pportdata *ppd)
{ … }