From bedbef8ad3e75a304af6361af235302bcc61d06b Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 14 May 2024 06:39:01 +0000
Subject: [PATCH] 修改内核路径
---
kernel/drivers/watchdog/jz4740_wdt.c | 144 ++++++++++++++++++++---------------------------
1 files changed, 61 insertions(+), 83 deletions(-)
diff --git a/kernel/drivers/watchdog/jz4740_wdt.c b/kernel/drivers/watchdog/jz4740_wdt.c
index ec4d99a..395bde7 100644
--- a/kernel/drivers/watchdog/jz4740_wdt.c
+++ b/kernel/drivers/watchdog/jz4740_wdt.c
@@ -1,18 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2010, Paul Cercueil <paul@crapouillou.net>
* JZ4740 Watchdog driver
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
- *
*/
+#include <linux/mfd/ingenic-tcu.h>
+#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
@@ -25,26 +18,7 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/of.h>
-
-#include <asm/mach-jz4740/timer.h>
-
-#define JZ_REG_WDT_TIMER_DATA 0x0
-#define JZ_REG_WDT_COUNTER_ENABLE 0x4
-#define JZ_REG_WDT_TIMER_COUNTER 0x8
-#define JZ_REG_WDT_TIMER_CONTROL 0xC
-
-#define JZ_WDT_CLOCK_PCLK 0x1
-#define JZ_WDT_CLOCK_RTC 0x2
-#define JZ_WDT_CLOCK_EXT 0x4
-
-#define JZ_WDT_CLOCK_DIV_SHIFT 3
-
-#define JZ_WDT_CLOCK_DIV_1 (0 << JZ_WDT_CLOCK_DIV_SHIFT)
-#define JZ_WDT_CLOCK_DIV_4 (1 << JZ_WDT_CLOCK_DIV_SHIFT)
-#define JZ_WDT_CLOCK_DIV_16 (2 << JZ_WDT_CLOCK_DIV_SHIFT)
-#define JZ_WDT_CLOCK_DIV_64 (3 << JZ_WDT_CLOCK_DIV_SHIFT)
-#define JZ_WDT_CLOCK_DIV_256 (4 << JZ_WDT_CLOCK_DIV_SHIFT)
-#define JZ_WDT_CLOCK_DIV_1024 (5 << JZ_WDT_CLOCK_DIV_SHIFT)
+#include <linux/regmap.h>
#define DEFAULT_HEARTBEAT 5
#define MAX_HEARTBEAT 2048
@@ -64,15 +38,17 @@
struct jz4740_wdt_drvdata {
struct watchdog_device wdt;
- void __iomem *base;
- struct clk *rtc_clk;
+ struct regmap *map;
+ struct clk *clk;
+ unsigned long clk_rate;
};
static int jz4740_wdt_ping(struct watchdog_device *wdt_dev)
{
struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
- writew(0x0, drvdata->base + JZ_REG_WDT_TIMER_COUNTER);
+ regmap_write(drvdata->map, TCU_REG_WDT_TCNT, 0);
+
return 0;
}
@@ -80,33 +56,17 @@
unsigned int new_timeout)
{
struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
- unsigned int rtc_clk_rate;
- unsigned int timeout_value;
- unsigned short clock_div = JZ_WDT_CLOCK_DIV_1;
+ u16 timeout_value = (u16)(drvdata->clk_rate * new_timeout);
+ unsigned int tcer;
- rtc_clk_rate = clk_get_rate(drvdata->rtc_clk);
+ regmap_read(drvdata->map, TCU_REG_WDT_TCER, &tcer);
+ regmap_write(drvdata->map, TCU_REG_WDT_TCER, 0);
- timeout_value = rtc_clk_rate * new_timeout;
- while (timeout_value > 0xffff) {
- if (clock_div == JZ_WDT_CLOCK_DIV_1024) {
- /* Requested timeout too high;
- * use highest possible value. */
- timeout_value = 0xffff;
- break;
- }
- timeout_value >>= 2;
- clock_div += (1 << JZ_WDT_CLOCK_DIV_SHIFT);
- }
+ regmap_write(drvdata->map, TCU_REG_WDT_TDR, timeout_value);
+ regmap_write(drvdata->map, TCU_REG_WDT_TCNT, 0);
- writeb(0x0, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE);
- writew(clock_div, drvdata->base + JZ_REG_WDT_TIMER_CONTROL);
-
- writew((u16)timeout_value, drvdata->base + JZ_REG_WDT_TIMER_DATA);
- writew(0x0, drvdata->base + JZ_REG_WDT_TIMER_COUNTER);
- writew(clock_div | JZ_WDT_CLOCK_RTC,
- drvdata->base + JZ_REG_WDT_TIMER_CONTROL);
-
- writeb(0x1, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE);
+ if (tcer & TCU_WDT_TCER_TCEN)
+ regmap_write(drvdata->map, TCU_REG_WDT_TCER, TCU_WDT_TCER_TCEN);
wdt_dev->timeout = new_timeout;
return 0;
@@ -114,8 +74,21 @@
static int jz4740_wdt_start(struct watchdog_device *wdt_dev)
{
- jz4740_timer_enable_watchdog();
+ struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+ unsigned int tcer;
+ int ret;
+
+ ret = clk_prepare_enable(drvdata->clk);
+ if (ret)
+ return ret;
+
+ regmap_read(drvdata->map, TCU_REG_WDT_TCER, &tcer);
+
jz4740_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+
+ /* Start watchdog if it wasn't started already */
+ if (!(tcer & TCU_WDT_TCER_TCEN))
+ regmap_write(drvdata->map, TCU_REG_WDT_TCER, TCU_WDT_TCER_TCEN);
return 0;
}
@@ -124,8 +97,8 @@
{
struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
- writeb(0x0, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE);
- jz4740_timer_disable_watchdog();
+ regmap_write(drvdata->map, TCU_REG_WDT_TCER, 0);
+ clk_disable_unprepare(drvdata->clk);
return 0;
}
@@ -163,47 +136,52 @@
static int jz4740_wdt_probe(struct platform_device *pdev)
{
+ struct device *dev = &pdev->dev;
struct jz4740_wdt_drvdata *drvdata;
struct watchdog_device *jz4740_wdt;
- struct resource *res;
+ long rate;
int ret;
- drvdata = devm_kzalloc(&pdev->dev, sizeof(struct jz4740_wdt_drvdata),
+ drvdata = devm_kzalloc(dev, sizeof(struct jz4740_wdt_drvdata),
GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
- if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
- heartbeat = DEFAULT_HEARTBEAT;
+ drvdata->clk = devm_clk_get(&pdev->dev, "wdt");
+ if (IS_ERR(drvdata->clk)) {
+ dev_err(&pdev->dev, "cannot find WDT clock\n");
+ return PTR_ERR(drvdata->clk);
+ }
+ /* Set smallest clock possible */
+ rate = clk_round_rate(drvdata->clk, 1);
+ if (rate < 0)
+ return rate;
+
+ ret = clk_set_rate(drvdata->clk, rate);
+ if (ret)
+ return ret;
+
+ drvdata->clk_rate = rate;
jz4740_wdt = &drvdata->wdt;
jz4740_wdt->info = &jz4740_wdt_info;
jz4740_wdt->ops = &jz4740_wdt_ops;
- jz4740_wdt->timeout = heartbeat;
jz4740_wdt->min_timeout = 1;
- jz4740_wdt->max_timeout = MAX_HEARTBEAT;
- jz4740_wdt->parent = &pdev->dev;
+ jz4740_wdt->max_timeout = 0xffff / rate;
+ jz4740_wdt->timeout = clamp(heartbeat,
+ jz4740_wdt->min_timeout,
+ jz4740_wdt->max_timeout);
+ jz4740_wdt->parent = dev;
watchdog_set_nowayout(jz4740_wdt, nowayout);
watchdog_set_drvdata(jz4740_wdt, drvdata);
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- drvdata->base = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(drvdata->base))
- return PTR_ERR(drvdata->base);
-
- drvdata->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
- if (IS_ERR(drvdata->rtc_clk)) {
- dev_err(&pdev->dev, "cannot find RTC clock\n");
- return PTR_ERR(drvdata->rtc_clk);
+ drvdata->map = device_node_to_regmap(dev->parent->of_node);
+ if (IS_ERR(drvdata->map)) {
+ dev_err(dev, "regmap not found\n");
+ return PTR_ERR(drvdata->map);
}
- ret = devm_watchdog_register_device(&pdev->dev, &drvdata->wdt);
- if (ret < 0)
- return ret;
-
- platform_set_drvdata(pdev, drvdata);
-
- return 0;
+ return devm_watchdog_register_device(dev, &drvdata->wdt);
}
static struct platform_driver jz4740_wdt_driver = {
--
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