xref: /dpdk/drivers/bus/fslmc/mc/mc_sys.c (revision 06cce2876a37ac6161652bd121ce1ff03d52cce5)

/* SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0)
 *
 * Copyright 2013-2015 Freescale Semiconductor Inc.
 * Copyright 2017,2022 NXP
 *
 */
#include <fsl_mc_sys.h>
#include <fsl_mc_cmd.h>

#include <rte_spinlock.h>
#include <rte_cycles.h>

/** User space framework uses MC Portal in shared mode. Following change
 * introduces lock in MC FLIB
 */

/**
 * A static spinlock initializer.
 */
static rte_spinlock_t mc_portal_lock = RTE_SPINLOCK_INITIALIZER;

static int mc_status_to_error(enum mc_cmd_status status)
{
	switch (status) {
	case MC_CMD_STATUS_OK:
		return 0;
	case MC_CMD_STATUS_AUTH_ERR:
		return -EACCES; /* Token error */
	case MC_CMD_STATUS_NO_PRIVILEGE:
		return -EPERM; /* Permission denied */
	case MC_CMD_STATUS_DMA_ERR:
		return -EIO; /* Input/Output error */
	case MC_CMD_STATUS_CONFIG_ERR:
		return -EINVAL; /* Device not configured */
	case MC_CMD_STATUS_TIMEOUT:
		return -ETIMEDOUT; /* Operation timed out */
	case MC_CMD_STATUS_NO_RESOURCE:
		return -ENAVAIL; /* Resource temporarily unavailable */
	case MC_CMD_STATUS_NO_MEMORY:
		return -ENOMEM; /* Cannot allocate memory */
	case MC_CMD_STATUS_BUSY:
		return -EBUSY; /* Device busy */
	case MC_CMD_STATUS_UNSUPPORTED_OP:
		return -ENOTSUP; /* Operation not supported by device */
	case MC_CMD_STATUS_INVALID_STATE:
		return -ENODEV; /* Invalid device state */
	default:
		break;
	}

	/* Not expected to reach here */
	return -EINVAL;
}

int mc_send_command(struct fsl_mc_io *mc_io, struct mc_command *cmd)
{
	enum mc_cmd_status status;
	uint64_t response, start_time, total_time, time_to_wait;

	if (!mc_io || !mc_io->regs)
		return -EACCES;

	/* --- Call lock function here in case portal is shared --- */
	rte_spinlock_lock(&mc_portal_lock);

	mc_write_command(mc_io->regs, cmd);

	/* Wait for one second. rte_get_timer_hz() returns frequency of CPU */
	time_to_wait = rte_get_timer_hz();
	total_time = 0;
	start_time = rte_get_timer_cycles();

	/* Spin until status changes */
	do {
		response = ioread64(mc_io->regs);
		status = mc_cmd_read_status((struct mc_command *)&response);
		total_time = rte_get_timer_cycles() - start_time;
	} while (status == MC_CMD_STATUS_READY && total_time <= time_to_wait);

	if (status == MC_CMD_STATUS_READY) {
		rte_spinlock_unlock(&mc_portal_lock);

		return mc_status_to_error(MC_CMD_STATUS_TIMEOUT);
	}

	/* Read the response back into the command buffer */
	mc_read_response(mc_io->regs, cmd);

	/* --- Call unlock function here in case portal is shared --- */
	rte_spinlock_unlock(&mc_portal_lock);

	return mc_status_to_error(status);
}