/*
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* Copyright 2017 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <common.h>
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#include <dm.h>
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#include <misc.h>
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#include <reset.h>
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#include <reset-uclass.h>
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#include <wdt.h>
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#include <asm/io.h>
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#include <asm/arch/scu_ast2500.h>
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#include <asm/arch/wdt.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct ast2500_reset_priv {
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/* WDT used to perform resets. */
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struct udevice *wdt;
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struct ast2500_scu *scu;
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};
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static int ast2500_ofdata_to_platdata(struct udevice *dev)
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{
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struct ast2500_reset_priv *priv = dev_get_priv(dev);
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int ret;
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ret = uclass_get_device_by_phandle(UCLASS_WDT, dev, "aspeed,wdt",
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&priv->wdt);
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if (ret) {
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debug("%s: can't find WDT for reset controller", __func__);
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return ret;
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}
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return 0;
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}
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static int ast2500_reset_assert(struct reset_ctl *reset_ctl)
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{
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struct ast2500_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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u32 reset_mode, reset_mask;
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bool reset_sdram;
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int ret;
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/*
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* To reset SDRAM, a specifal flag in SYSRESET register
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* needs to be enabled first
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*/
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reset_mode = ast_reset_mode_from_flags(reset_ctl->id);
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reset_mask = ast_reset_mask_from_flags(reset_ctl->id);
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reset_sdram = reset_mode == WDT_CTRL_RESET_SOC &&
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(reset_mask & WDT_RESET_SDRAM);
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if (reset_sdram) {
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ast_scu_unlock(priv->scu);
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setbits_le32(&priv->scu->sysreset_ctrl1,
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SCU_SYSRESET_SDRAM_WDT);
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ret = wdt_expire_now(priv->wdt, reset_ctl->id);
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clrbits_le32(&priv->scu->sysreset_ctrl1,
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SCU_SYSRESET_SDRAM_WDT);
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ast_scu_lock(priv->scu);
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} else {
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ret = wdt_expire_now(priv->wdt, reset_ctl->id);
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}
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return ret;
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}
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static int ast2500_reset_request(struct reset_ctl *reset_ctl)
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{
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debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
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reset_ctl->dev, reset_ctl->id);
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return 0;
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}
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static int ast2500_reset_probe(struct udevice *dev)
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{
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struct ast2500_reset_priv *priv = dev_get_priv(dev);
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priv->scu = ast_get_scu();
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return 0;
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}
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static const struct udevice_id ast2500_reset_ids[] = {
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{ .compatible = "aspeed,ast2500-reset" },
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{ }
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};
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struct reset_ops ast2500_reset_ops = {
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.rst_assert = ast2500_reset_assert,
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.request = ast2500_reset_request,
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};
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U_BOOT_DRIVER(ast2500_reset) = {
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.name = "ast2500_reset",
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.id = UCLASS_RESET,
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.of_match = ast2500_reset_ids,
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.probe = ast2500_reset_probe,
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.ops = &ast2500_reset_ops,
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.ofdata_to_platdata = ast2500_ofdata_to_platdata,
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.priv_auto_alloc_size = sizeof(struct ast2500_reset_priv),
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};
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