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201 lines
5.7 KiB
Diff
201 lines
5.7 KiB
Diff
From 90964ab2d00546a59086ffd08964da3d2a5cefc9 Mon Sep 17 00:00:00 2001
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From: Eric Anholt <eric@anholt.net>
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Date: Wed, 12 Dec 2018 15:51:47 -0800
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Subject: [PATCH] bcm2835-pm: Move bcm2835-watchdog's DT probe to an
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MFD.
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The PM block that the wdt driver was binding to actually has multiple
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features we want to expose (power domains, reset, watchdog). Move the
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DT attachment to a MFD driver and make WDT probe against MFD.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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Reviewed-by: Guenter Roeck <linux@roeck-us.net>
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Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
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Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
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(cherry picked from commit 5e6acc3e678ed3db746ab4fb53a980861cd711b6)
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---
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drivers/mfd/Makefile | 1 +
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drivers/mfd/bcm2835-pm.c | 64 ++++++++++++++++++++++++++++++++++
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drivers/watchdog/bcm2835_wdt.c | 26 +++++---------
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include/linux/mfd/bcm2835-pm.h | 13 +++++++
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4 files changed, 87 insertions(+), 17 deletions(-)
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create mode 100644 drivers/mfd/bcm2835-pm.c
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create mode 100644 include/linux/mfd/bcm2835-pm.h
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--- a/drivers/mfd/Makefile
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+++ b/drivers/mfd/Makefile
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@@ -10,6 +10,7 @@ obj-$(CONFIG_MFD_88PM805) += 88pm805.o 8
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obj-$(CONFIG_MFD_ACT8945A) += act8945a.o
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obj-$(CONFIG_MFD_SM501) += sm501.o
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obj-$(CONFIG_MFD_ASIC3) += asic3.o tmio_core.o
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+obj-$(CONFIG_ARCH_BCM2835) += bcm2835-pm.o
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obj-$(CONFIG_MFD_BCM590XX) += bcm590xx.o
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obj-$(CONFIG_MFD_BD9571MWV) += bd9571mwv.o
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cros_ec_core-objs := cros_ec.o
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--- /dev/null
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+++ b/drivers/mfd/bcm2835-pm.c
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@@ -0,0 +1,64 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * PM MFD driver for Broadcom BCM2835
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+ *
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+ * This driver binds to the PM block and creates the MFD device for
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+ * the WDT driver.
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+ */
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+
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+#include <linux/delay.h>
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+#include <linux/io.h>
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+#include <linux/mfd/bcm2835-pm.h>
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+#include <linux/mfd/core.h>
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+#include <linux/module.h>
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+#include <linux/of_address.h>
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+#include <linux/of_platform.h>
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+#include <linux/platform_device.h>
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+#include <linux/types.h>
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+#include <linux/watchdog.h>
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+
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+static const struct mfd_cell bcm2835_pm_devs[] = {
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+ { .name = "bcm2835-wdt" },
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+};
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+
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+static int bcm2835_pm_probe(struct platform_device *pdev)
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+{
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+ struct resource *res;
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+ struct device *dev = &pdev->dev;
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+ struct bcm2835_pm *pm;
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+
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+ pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
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+ if (!pm)
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+ return -ENOMEM;
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+ platform_set_drvdata(pdev, pm);
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+
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+ pm->dev = dev;
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ pm->base = devm_ioremap_resource(dev, res);
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+ if (IS_ERR(pm->base))
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+ return PTR_ERR(pm->base);
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+
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+ return devm_mfd_add_devices(dev, -1,
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+ bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
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+ NULL, 0, NULL);
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+}
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+
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+static const struct of_device_id bcm2835_pm_of_match[] = {
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+ { .compatible = "brcm,bcm2835-pm-wdt", },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
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+
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+static struct platform_driver bcm2835_pm_driver = {
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+ .probe = bcm2835_pm_probe,
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+ .driver = {
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+ .name = "bcm2835-pm",
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+ .of_match_table = bcm2835_pm_of_match,
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+ },
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+};
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+module_platform_driver(bcm2835_pm_driver);
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+
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+MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
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+MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
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+MODULE_LICENSE("GPL");
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--- a/drivers/watchdog/bcm2835_wdt.c
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+++ b/drivers/watchdog/bcm2835_wdt.c
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@@ -12,6 +12,7 @@
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#include <linux/delay.h>
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#include <linux/types.h>
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+#include <linux/mfd/bcm2835-pm.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/watchdog.h>
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@@ -41,6 +42,8 @@ struct bcm2835_wdt {
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spinlock_t lock;
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};
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+static struct bcm2835_wdt *bcm2835_power_off_wdt;
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+
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static unsigned int heartbeat;
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static bool nowayout = WATCHDOG_NOWAYOUT;
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@@ -163,10 +166,7 @@ static struct watchdog_device bcm2835_wd
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*/
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static void bcm2835_power_off(void)
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{
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- struct device_node *np =
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- of_find_compatible_node(NULL, NULL, "brcm,bcm2835-pm-wdt");
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- struct platform_device *pdev = of_find_device_by_node(np);
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- struct bcm2835_wdt *wdt = platform_get_drvdata(pdev);
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+ struct bcm2835_wdt *wdt = bcm2835_power_off_wdt;
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/* Partition 63 tells the firmware that this is a halt */
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__bcm2835_restart(wdt, 63);
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@@ -174,7 +174,7 @@ static void bcm2835_power_off(void)
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static int bcm2835_wdt_probe(struct platform_device *pdev)
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{
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- struct resource *res;
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+ struct bcm2835_pm *pm = dev_get_drvdata(pdev->dev.parent);
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struct device *dev = &pdev->dev;
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struct bcm2835_wdt *wdt;
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int err;
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@@ -186,10 +186,7 @@ static int bcm2835_wdt_probe(struct plat
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spin_lock_init(&wdt->lock);
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- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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- wdt->base = devm_ioremap_resource(dev, res);
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- if (IS_ERR(wdt->base))
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- return PTR_ERR(wdt->base);
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+ wdt->base = pm->base;
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watchdog_set_drvdata(&bcm2835_wdt_wdd, wdt);
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watchdog_init_timeout(&bcm2835_wdt_wdd, heartbeat, dev);
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@@ -216,8 +213,10 @@ static int bcm2835_wdt_probe(struct plat
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return err;
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}
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- if (pm_power_off == NULL)
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+ if (pm_power_off == NULL) {
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pm_power_off = bcm2835_power_off;
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+ bcm2835_power_off_wdt = wdt;
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+ }
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dev_info(dev, "Broadcom BCM2835 watchdog timer");
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return 0;
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@@ -231,18 +230,11 @@ static int bcm2835_wdt_remove(struct pla
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return 0;
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}
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-static const struct of_device_id bcm2835_wdt_of_match[] = {
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- { .compatible = "brcm,bcm2835-pm-wdt", },
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- {},
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-};
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-MODULE_DEVICE_TABLE(of, bcm2835_wdt_of_match);
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-
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static struct platform_driver bcm2835_wdt_driver = {
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.probe = bcm2835_wdt_probe,
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.remove = bcm2835_wdt_remove,
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.driver = {
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.name = "bcm2835-wdt",
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- .of_match_table = bcm2835_wdt_of_match,
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},
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};
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module_platform_driver(bcm2835_wdt_driver);
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--- /dev/null
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+++ b/include/linux/mfd/bcm2835-pm.h
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@@ -0,0 +1,13 @@
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+/* SPDX-License-Identifier: GPL-2.0+ */
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+
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+#ifndef BCM2835_MFD_PM_H
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+#define BCM2835_MFD_PM_H
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+
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+#include <linux/regmap.h>
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+
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+struct bcm2835_pm {
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+ struct device *dev;
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+ void __iomem *base;
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+};
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+
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+#endif /* BCM2835_MFD_PM_H */
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