linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

 * CAAM/SEC 4.x transport/backend driver

 * JobR backend functionality

 *

 * Copyright 2008-2012 Freescale Semiconductor, Inc.

 */

​

#include <linux/of_irq.h>

#include <linux/of_address.h>

​

#include "compat.h"

#include "ctrl.h"

#include "regs.h"

#include "jr.h"

#include "desc.h"

#include "intern.h"

​

struct jr_driver_data {

    /* List of Physical JobR's with the Driver */

    struct list_head    jr_list;

    spinlock_t      jr_alloc_lock;  /* jr_list lock */

} ____cacheline_aligned;

​

static struct jr_driver_data driver_data;

​

static int caam_reset_hw_jr(struct device *dev)

{

    struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);

    unsigned int timeout = 100000;

​

    /*

     * mask interrupts since we are going to poll

     * for reset completion status

     */

    clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JRCFG_IMSK);

​

    /* initiate flush (required prior to reset) */

    wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);

    while (((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) ==

        JRINT_ERR_HALT_INPROGRESS) && --timeout)

        cpu_relax();

​

    if ((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) !=

        JRINT_ERR_HALT_COMPLETE || timeout == 0) {

        dev_err(dev, "failed to flush job ring %d\n", jrp->ridx);

        return -EIO;

    }

​

    /* initiate reset */

    timeout = 100000;

    wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);

    while ((rd_reg32(&jrp->rregs->jrcommand) & JRCR_RESET) && --timeout)

        cpu_relax();

​

    if (timeout == 0) {

        dev_err(dev, "failed to reset job ring %d\n", jrp->ridx);

        return -EIO;

    }

​

    /* unmask interrupts */

    clrsetbits_32(&jrp->rregs->rconfig_lo, JRCFG_IMSK, 0);

​