path: root/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 "hfi1_platform.dat"

static int validate_scratch_checksum(struct hfi1_devdata *dd)
{
	u64 checksum = 0, temp_scratch = 0;
	int i, j, version;

	temp_scratch = read_csr(dd, ASIC_CFG_SCRATCH);
	version = (temp_scratch & BITMAP_VERSION_SMASK) >> BITMAP_VERSION_SHIFT;

	/* Prevent power on default of all zeroes from passing checksum */
	if (!version) {
		dd_dev_err(dd, "%s: Config bitmap uninitialized\n", __func__);
		dd_dev_err(dd,
			   "%s: Please update your BIOS to support active channels\n",
			   __func__);
		return 0;
	}

	/*
	 * ASIC scratch 0 only contains the checksum and bitmap version as
	 * fields of interest, both of which are handled separately from the
	 * loop below, so skip it
	 */
	checksum += version;
	for (i = 1; i < ASIC_NUM_SCRATCH; i++) {
		temp_scratch = read_csr(dd, ASIC_CFG_SCRATCH + (8 * i));
		for (j = sizeof(u64); j != 0; j -= 2) {
			checksum += (temp_scratch & 0xFFFF);
			temp_scratch >>= 16;
		}
	}

	while (checksum >> 16)
		checksum = (checksum & CHECKSUM_MASK) + (checksum >> 16);

	temp_scratch = read_csr(dd, ASIC_CFG_SCRATCH);
	temp_scratch &= CHECKSUM_SMASK;
	temp_scratch >>= CHECKSUM_SHIFT;

	if (checksum + temp_scratch == 0xFFFF)
		return 1;

	dd_dev_err(dd, "%s: Configuration bitmap corrupted\n", __func__);
	return 0;
}

static void save_platform_config_fields(struct hfi1_devdata *dd)
{
	struct hfi1_pportdata *ppd = dd->pport;
	u64 temp_scratch = 0, temp_dest = 0;

	temp_scratch = read_csr(dd, ASIC_CFG_SCRATCH_1);

	temp_dest = temp_scratch &
		    (dd->hfi1_id ? PORT1_PORT_TYPE_SMASK :
		     PORT0_PORT_TYPE_SMASK);
	ppd->port_type = temp_dest >>
			 (dd->hfi1_id ? PORT1_PORT_TYPE_SHIFT :
			  PORT0_PORT_TYPE_SHIFT);

	temp_dest = temp_scratch &
		    (dd->hfi1_id ? PORT1_LOCAL_ATTEN_SMASK :
		     PORT0_LOCAL_ATTEN_SMASK);
	ppd->local_atten = temp_dest >>
			   (dd->hfi1_id ? PORT1_LOCAL_ATTEN_SHIFT :
			    PORT0_LOCAL_ATTEN_SHIFT);

	temp_dest = temp_scratch &
		    (dd->hfi1_id ? PORT1_REMOTE_ATTEN_SMASK :
		     PORT0_REMOTE_ATTEN_SMASK);
	ppd->remote_atten = temp_dest >>
			    (dd->hfi1_id ? PORT1_REMOTE_ATTEN_SHIFT :
			     PORT0_REMOTE_ATTEN_SHIFT);

	temp_dest = temp_scratch &
		    (dd->hfi1_id ? PORT1_DEFAULT_ATTEN_SMASK :
		     PORT0_DEFAULT_ATTEN_SMASK);
	ppd->default_atten = temp_dest >>
			     (dd->hfi1_id ? PORT1_DEFAULT_ATTEN_SHIFT :
			      PORT0_DEFAULT_ATTEN_SHIFT);

	temp_scratch = read_csr(dd, dd->hfi1_id ? ASIC_CFG_SCRATCH_3 :
				ASIC_CFG_SCRATCH_2);

	ppd->tx_preset_eq = (temp_scratch & TX_EQ_SMASK) >> TX_EQ_SHIFT;
	ppd->tx_preset_noeq = (temp_scratch & TX_NO_EQ_SMASK) >> TX_NO_EQ_SHIFT;
	ppd->rx_preset = (temp_scratch & RX_SMASK) >> RX_SHIFT;

	ppd->max_power_class = (temp_scratch & QSFP_MAX_POWER_SMASK) >>
				QSFP_MAX_POWER_SHIFT;

	ppd->config_from_scratch = true;
}

void get_platform_config(struct hfi1_devdata *dd)
{
	int ret = 0;
	u8 *temp_platform_config = NULL;
	u32 esize;
	const struct firmware *platform_config_file = NULL;

	if (is_integrated(dd)) {
		if (validate_scratch_checksum(dd)) {
			save_platform_config_fields(dd