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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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/*
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* Copyright (C) 2019, STMicroelectronics - All Rights Reserved
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*/
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#include <common.h>
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#include <clk.h>
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#include <dm.h>
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#include <log.h>
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#include <syscon.h>
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#include <wdt.h>
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#include <asm/io.h>
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#include <linux/bitops.h>
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#include <linux/iopoll.h>
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/* IWDG registers */
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#define IWDG_KR 0x00 /* Key register */
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#define IWDG_PR 0x04 /* Prescaler Register */
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#define IWDG_RLR 0x08 /* ReLoad Register */
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#define IWDG_SR 0x0C /* Status Register */
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/* IWDG_KR register bit mask */
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#define KR_KEY_RELOAD 0xAAAA /* Reload counter enable */
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#define KR_KEY_ENABLE 0xCCCC /* Peripheral enable */
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#define KR_KEY_EWA 0x5555 /* Write access enable */
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/* IWDG_PR register bit values */
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#define PR_256 0x06 /* Prescaler set to 256 */
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/* IWDG_RLR register values */
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#define RLR_MAX 0xFFF /* Max value supported by reload register */
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/* IWDG_SR register bit values */
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#define SR_PVU BIT(0) /* Watchdog prescaler value update */
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#define SR_RVU BIT(1) /* Watchdog counter reload value update */
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struct stm32mp_wdt_priv {
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fdt_addr_t base; /* registers addr in physical memory */
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unsigned long wdt_clk_rate; /* Watchdog dedicated clock rate */
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};
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static int stm32mp_wdt_reset(struct udevice *dev)
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{
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struct stm32mp_wdt_priv *priv = dev_get_priv(dev);
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writel(KR_KEY_RELOAD, priv->base + IWDG_KR);
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return 0;
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}
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static int stm32mp_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
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{
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struct stm32mp_wdt_priv *priv = dev_get_priv(dev);
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int reload;
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u32 val;
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int ret;
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/* Prescaler fixed to 256 */
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reload = timeout_ms * priv->wdt_clk_rate / 256;
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if (reload > RLR_MAX + 1)
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/* Force to max watchdog counter reload value */
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reload = RLR_MAX + 1;
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else if (!reload)
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/* Force to min watchdog counter reload value */
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reload = priv->wdt_clk_rate / 256;
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/* Set prescaler & reload registers */
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writel(KR_KEY_EWA, priv->base + IWDG_KR);
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writel(PR_256, priv->base + IWDG_PR);
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writel(reload - 1, priv->base + IWDG_RLR);
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/* Enable watchdog */
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writel(KR_KEY_ENABLE, priv->base + IWDG_KR);
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/* Wait for the registers to be updated */
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ret = readl_poll_timeout(priv->base + IWDG_SR, val,
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val & (SR_PVU | SR_RVU), CONFIG_SYS_HZ);
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if (ret < 0) {
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pr_err("Updating IWDG registers timeout");
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return -ETIMEDOUT;
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}
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return 0;
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}
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static int stm32mp_wdt_probe(struct udevice *dev)
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{
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struct stm32mp_wdt_priv *priv = dev_get_priv(dev);
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struct clk clk;
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int ret;
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debug("IWDG init\n");
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priv->base = dev_read_addr(dev);
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if (priv->base == FDT_ADDR_T_NONE)
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return -EINVAL;
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/* Enable clock */
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ret = clk_get_by_name(dev, "pclk", &clk);
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if (ret)
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return ret;
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ret = clk_enable(&clk);
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if (ret)
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return ret;
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/* Get LSI clock */
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ret = clk_get_by_name(dev, "lsi", &clk);
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if (ret)
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return ret;
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priv->wdt_clk_rate = clk_get_rate(&clk);
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debug("IWDG init done\n");
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return 0;
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}
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static const struct wdt_ops stm32mp_wdt_ops = {
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.start = stm32mp_wdt_start,
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.reset = stm32mp_wdt_reset,
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};
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static const struct udevice_id stm32mp_wdt_match[] = {
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{ .compatible = "st,stm32mp1-iwdg" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(stm32mp_wdt) = {
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.name = "stm32mp-wdt",
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.id = UCLASS_WDT,
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.of_match = stm32mp_wdt_match,
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.priv_auto = sizeof(struct stm32mp_wdt_priv),
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.probe = stm32mp_wdt_probe,
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.ops = &stm32mp_wdt_ops,
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};
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