1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright 2017 Google, Inc
10 #include <reset-uclass.h>
13 #include <asm/arch/scu_ast2500.h>
14 #include <asm/arch/wdt.h>
16 struct ast2500_reset_priv {
17 /* WDT used to perform resets. */
19 struct ast2500_scu *scu;
22 static int ast2500_ofdata_to_platdata(struct udevice *dev)
24 struct ast2500_reset_priv *priv = dev_get_priv(dev);
27 ret = uclass_get_device_by_phandle(UCLASS_WDT, dev, "aspeed,wdt",
30 debug("%s: can't find WDT for reset controller", __func__);
37 static int ast2500_reset_assert(struct reset_ctl *reset_ctl)
39 struct ast2500_reset_priv *priv = dev_get_priv(reset_ctl->dev);
40 u32 reset_mode, reset_mask;
45 * To reset SDRAM, a specifal flag in SYSRESET register
46 * needs to be enabled first
48 reset_mode = ast_reset_mode_from_flags(reset_ctl->id);
49 reset_mask = ast_reset_mask_from_flags(reset_ctl->id);
50 reset_sdram = reset_mode == WDT_CTRL_RESET_SOC &&
51 (reset_mask & WDT_RESET_SDRAM);
54 ast_scu_unlock(priv->scu);
55 setbits_le32(&priv->scu->sysreset_ctrl1,
56 SCU_SYSRESET_SDRAM_WDT);
57 ret = wdt_expire_now(priv->wdt, reset_ctl->id);
58 clrbits_le32(&priv->scu->sysreset_ctrl1,
59 SCU_SYSRESET_SDRAM_WDT);
60 ast_scu_lock(priv->scu);
62 ret = wdt_expire_now(priv->wdt, reset_ctl->id);
68 static int ast2500_reset_request(struct reset_ctl *reset_ctl)
70 debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
71 reset_ctl->dev, reset_ctl->id);
76 static int ast2500_reset_probe(struct udevice *dev)
78 struct ast2500_reset_priv *priv = dev_get_priv(dev);
80 priv->scu = ast_get_scu();
85 static const struct udevice_id ast2500_reset_ids[] = {
86 { .compatible = "aspeed,ast2500-reset" },
90 struct reset_ops ast2500_reset_ops = {
91 .rst_assert = ast2500_reset_assert,
92 .request = ast2500_reset_request,
95 U_BOOT_DRIVER(ast2500_reset) = {
96 .name = "ast2500_reset",
98 .of_match = ast2500_reset_ids,
99 .probe = ast2500_reset_probe,
100 .ops = &ast2500_reset_ops,
101 .ofdata_to_platdata = ast2500_ofdata_to_platdata,
102 .priv_auto_alloc_size = sizeof(struct ast2500_reset_priv),