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 
omap_iommu_set_pwrdm_constraint(struct platform_device * pdev,bool request,u8 * pwrst)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 }
44