1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * Copyright (C) 2016 Google, Inc 3*4882a593Smuzhiyun * 4*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #include <common.h> 8*4882a593Smuzhiyun #include <dm.h> 9*4882a593Smuzhiyun #include <asm/io.h> 10*4882a593Smuzhiyun #include <asm/arch/scu_ast2500.h> 11*4882a593Smuzhiyun ast_get_clk(struct udevice ** devp)12*4882a593Smuzhiyunint ast_get_clk(struct udevice **devp) 13*4882a593Smuzhiyun { 14*4882a593Smuzhiyun return uclass_get_device_by_driver(UCLASS_CLK, 15*4882a593Smuzhiyun DM_GET_DRIVER(aspeed_ast2500_scu), devp); 16*4882a593Smuzhiyun } 17*4882a593Smuzhiyun ast_get_scu(void)18*4882a593Smuzhiyunvoid *ast_get_scu(void) 19*4882a593Smuzhiyun { 20*4882a593Smuzhiyun struct ast2500_clk_priv *priv; 21*4882a593Smuzhiyun struct udevice *dev; 22*4882a593Smuzhiyun int ret; 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun ret = ast_get_clk(&dev); 25*4882a593Smuzhiyun if (ret) 26*4882a593Smuzhiyun return ERR_PTR(ret); 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun priv = dev_get_priv(dev); 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun return priv->scu; 31*4882a593Smuzhiyun } 32*4882a593Smuzhiyun ast_scu_unlock(struct ast2500_scu * scu)33*4882a593Smuzhiyunvoid ast_scu_unlock(struct ast2500_scu *scu) 34*4882a593Smuzhiyun { 35*4882a593Smuzhiyun writel(SCU_UNLOCK_VALUE, &scu->protection_key); 36*4882a593Smuzhiyun while (!readl(&scu->protection_key)) 37*4882a593Smuzhiyun ; 38*4882a593Smuzhiyun } 39*4882a593Smuzhiyun ast_scu_lock(struct ast2500_scu * scu)40*4882a593Smuzhiyunvoid ast_scu_lock(struct ast2500_scu *scu) 41*4882a593Smuzhiyun { 42*4882a593Smuzhiyun writel(~SCU_UNLOCK_VALUE, &scu->protection_key); 43*4882a593Smuzhiyun while (readl(&scu->protection_key)) 44*4882a593Smuzhiyun ; 45*4882a593Smuzhiyun } 46