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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2016 Google, Inc
- */
- #include <common.h>
- #include <dm.h>
- #include <asm/io.h>
- #include <asm/arch/scu_ast2500.h>
- #include <linux/err.h>
- int ast_get_clk(struct udevice **devp)
- {
- return uclass_get_device_by_driver(UCLASS_CLK,
- DM_GET_DRIVER(aspeed_ast2500_scu), devp);
- }
- void *ast_get_scu(void)
- {
- struct ast2500_clk_priv *priv;
- struct udevice *dev;
- int ret;
- ret = ast_get_clk(&dev);
- if (ret)
- return ERR_PTR(ret);
- priv = dev_get_priv(dev);
- return priv->scu;
- }
- void ast_scu_unlock(struct ast2500_scu *scu)
- {
- writel(SCU_UNLOCK_VALUE, &scu->protection_key);
- while (!readl(&scu->protection_key))
- ;
- }
- void ast_scu_lock(struct ast2500_scu *scu)
- {
- writel(~SCU_UNLOCK_VALUE, &scu->protection_key);
- while (readl(&scu->protection_key))
- ;
- }
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