LXR linux/arch/arm/mach-omap2/omap-iommu.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * OMAP IOMMU quirks for various TI SoCs
   4 *
   5 * Copyright (C) 2015-2019 Texas Instruments Incorporated - http://www.ti.com/
   6 *      Suman Anna <s-anna@ti.com>
   7 */
   8
   9#include <linux/platform_device.h>
  10#include <linux/err.h>
  11
  12#include "omap_hwmod.h"
  13#include "omap_device.h"
  14#include "powerdomain.h"
  15
  16int omap_iommu_set_pwrdm_constraint(struct platform_device *pdev, bool request,
  17                                    u8 *pwrst)
  18{
  19        struct powerdomain *pwrdm;
  20        struct omap_device *od;
  21        u8 next_pwrst;
  22
  23        od = to_omap_device(pdev);
  24        if (!od)
  25                return -ENODEV;
  26
  27        if (od->hwmods_cnt != 1)
  28                return -EINVAL;
  29
  30        pwrdm = omap_hwmod_get_pwrdm(od->hwmods[0]);
  31        if (!pwrdm)
  32                return -EINVAL;
  33
  34        if (request)
  35                *pwrst = pwrdm_read_next_pwrst(pwrdm);
  36
  37        if (*pwrst > PWRDM_POWER_RET)
  38                return 0;
  39
  40        next_pwrst = request ? PWRDM_POWER_ON : *pwrst;
  41
  42        return pwrdm_set_next_pwrst(pwrdm, next_pwrst);
  43}
  44