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
  16 int 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 }