| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright (c) 2022 Nuvoton Technology, Inc |
| */ |
| |
| #include <dm.h> |
| #include <errno.h> |
| #include <log.h> |
| #include <wdt.h> |
| #include <asm/io.h> |
| #include <linux/delay.h> |
| #include <linux/err.h> |
| |
| #define NPCM_WTCLK (BIT(10) | BIT(11)) /* Clock divider */ |
| #define NPCM_WTE BIT(7) /* Enable */ |
| #define NPCM_WTIE BIT(6) /* Enable irq */ |
| #define NPCM_WTIS (BIT(4) | BIT(5)) /* Interval selection */ |
| #define NPCM_WTIF BIT(3) /* Interrupt flag*/ |
| #define NPCM_WTRF BIT(2) /* Reset flag */ |
| #define NPCM_WTRE BIT(1) /* Reset enable */ |
| #define NPCM_WTR BIT(0) /* Reset counter */ |
| |
| struct npcm_wdt_priv { |
| void __iomem *regs; |
| }; |
| |
| static int npcm_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags) |
| { |
| struct npcm_wdt_priv *priv = dev_get_priv(dev); |
| u32 time_out, val; |
| |
| time_out = (u32)(timeout_ms) / 1000; |
| if (time_out < 2) |
| val = 0x800; |
| else if (time_out < 3) |
| val = 0x420; |
| else if (time_out < 6) |
| val = 0x810; |
| else if (time_out < 11) |
| val = 0x430; |
| else if (time_out < 22) |
| val = 0x820; |
| else if (time_out < 44) |
| val = 0xc00; |
| else if (time_out < 87) |
| val = 0x830; |
| else if (time_out < 173) |
| val = 0xc10; |
| else if (time_out < 688) |
| val = 0xc20; |
| else |
| val = 0xc30; |
| |
| val |= NPCM_WTRE | NPCM_WTE | NPCM_WTR | NPCM_WTIE; |
| writel(val, priv->regs); |
| |
| return 0; |
| } |
| |
| static int npcm_wdt_stop(struct udevice *dev) |
| { |
| struct npcm_wdt_priv *priv = dev_get_priv(dev); |
| |
| writel(0, priv->regs); |
| |
| return 0; |
| } |
| |
| static int npcm_wdt_reset(struct udevice *dev) |
| { |
| struct npcm_wdt_priv *priv = dev_get_priv(dev); |
| |
| writel(NPCM_WTR | NPCM_WTRE | NPCM_WTE, priv->regs); |
| |
| return 0; |
| } |
| |
| static int npcm_wdt_of_to_plat(struct udevice *dev) |
| { |
| struct npcm_wdt_priv *priv = dev_get_priv(dev); |
| |
| priv->regs = dev_read_addr_ptr(dev); |
| if (!priv->regs) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static const struct wdt_ops npcm_wdt_ops = { |
| .start = npcm_wdt_start, |
| .reset = npcm_wdt_reset, |
| .stop = npcm_wdt_stop, |
| }; |
| |
| static const struct udevice_id npcm_wdt_ids[] = { |
| { .compatible = "nuvoton,npcm750-wdt" }, |
| { } |
| }; |
| |
| static int npcm_wdt_probe(struct udevice *dev) |
| { |
| debug("%s() wdt%u\n", __func__, dev_seq(dev)); |
| npcm_wdt_stop(dev); |
| |
| return 0; |
| } |
| |
| U_BOOT_DRIVER(npcm_wdt) = { |
| .name = "npcm_wdt", |
| .id = UCLASS_WDT, |
| .of_match = npcm_wdt_ids, |
| .probe = npcm_wdt_probe, |
| .priv_auto = sizeof(struct npcm_wdt_priv), |
| .of_to_plat = npcm_wdt_of_to_plat, |
| .ops = &npcm_wdt_ops, |
| }; |