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authorLinus Torvalds <torvalds@linux-foundation.org>2016-05-19 10:02:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-19 10:02:26 -0700
commit07b75260ebc2c789724c594d7eaf0194fa47b3be (patch)
treed88b770bca479789e688d95e50aacd5d09b59b21 /drivers/watchdog
parent0efacbbaee1e94e9942da0912f5b46ffd45a74bd (diff)
parent6e4ad1b413604b9130bdbe532aafdbd47ff5318e (diff)
downloadlwn-07b75260ebc2c789724c594d7eaf0194fa47b3be.tar.gz
lwn-07b75260ebc2c789724c594d7eaf0194fa47b3be.zip
Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
Pull MIPS updates from Ralf Baechle: "This is the main pull request for MIPS for 4.7. Here's the summary of the changes: - ATH79: Support for DTB passuing using the UHI boot protocol - ATH79: Remove support for builtin DTB. - ATH79: Add zboot debug serial support. - ATH79: Add initial support for Dragino MS14 (Dragine 2), Onion Omega and DPT-Module. - ATH79: Update devicetree clock support for AR9132 and AR9331. - ATH79: Cleanup the DT code. - ATH79: Support newer SOCs in ath79_ddr_ctrl_init. - ATH79: Fix regression in PCI window initialization. - BCM47xx: Move SPROM driver to drivers/firmware/ - BCM63xx: Enable partition parser in defconfig. - BMIPS: BMIPS5000 has I cache filing from D cache - BMIPS: BMIPS: Add cpu-feature-overrides.h - BMIPS: Add Whirlwind support - BMIPS: Adjust mips-hpt-frequency for BCM7435 - BMIPS: Remove maxcpus from BCM97435SVMB DTS - BMIPS: Add missing 7038 L1 register cells to BCM7435 - BMIPS: Various tweaks to initialization code. - BMIPS: Enable partition parser in defconfig. - BMIPS: Cache tweaks. - BMIPS: Add UART, I2C and SATA devices to DT. - BMIPS: Add BCM6358 and BCM63268support - BMIPS: Add device tree example for BCM6358. - BMIPS: Improve Improve BCM6328 and BCM6368 device trees - Lantiq: Add support for device tree file from boot loader - Lantiq: Allow build with no built-in DT. - Loongson 3: Reserve 32MB for RS780E integrated GPU. - Loongson 3: Fix build error after ld-version.sh modification - Loongson 3: Move chipset ACPI code from drivers to arch. - Loongson 3: Speedup irq processing. - Loongson 3: Add basic Loongson 3A support. - Loongson 3: Set cache flush handlers to nop. - Loongson 3: Invalidate special TLBs when needed. - Loongson 3: Fast TLB refill handler. - MT7620: Fallback strategy for invalid syscfg0. - Netlogic: Fix CP0_EBASE redefinition warnings - Octeon: Initialization fixes - Octeon: Add DTS files for the D-Link DSR-1000N and EdgeRouter Lite - Octeon: Enable add Octeon-drivers in cavium_octeon_defconfig - Octeon: Correctly handle endian-swapped initramfs images. - Octeon: Support CN73xx, CN75xx and CN78xx. - Octeon: Remove dead code from cvmx-sysinfo. - Octeon: Extend number of supported CPUs past 32. - Octeon: Remove some code limiting NR_IRQS to 255. - Octeon: Simplify octeon_irq_ciu_gpio_set_type. - Octeon: Mark some functions __init in smp.c - Octeon: Octeon: Add Octeon III CN7xxx interface detection - PIC32: Add serial driver and bindings for it. - PIC32: Add PIC32 deadman timer driver and bindings. - PIC32: Add PIC32 clock timer driver and bindings. - Pistachio: Determine SoC revision during boot - Sibyte: Fix Kconfig dependencies of SIBYTE_BUS_WATCHER. - Sibyte: Strip redundant comments from bcm1480_regs.h. - Panic immediately if panic_on_oops is set. - module: fix incorrect IS_ERR_VALUE macro usage. - module: Make consistent use of pr_* - Remove no longer needed work_on_cpu() call. - Remove CONFIG_IPV6_PRIVACY from defconfigs. - Fix registers of non-crashing CPUs in dumps. - Handle MIPSisms in new vmcore_elf32_check_arch. - Select CONFIG_HANDLE_DOMAIN_IRQ and make it work. - Allow RIXI to be used on non-R2 or R6 cores. - Reserve nosave data for hibernation - Fix siginfo.h to use strict POSIX types. - Don't unwind user mode with EVA. - Fix watchpoint restoration - Ptrace watchpoints for R6. - Sync icache when it fills from dcache - I6400 I-cache fills from dcache. - Various MSA fixes. - Cleanup MIPS_CPU_* definitions. - Signal: Move generic copy_siginfo to signal.h - Signal: Fix uapi include in exported asm/siginfo.h - Timer fixes for sake of KVM. - XPA TLB refill fixes. - Treat perf counter feature - Update John Crispin's email address - Add PIC32 watchdog and bindings. - Handle R10000 LL/SC bug in set_pte() - cpufreq: Various fixes for Longson1. - R6: Fix R2 emulation. - mathemu: Cosmetic fix to ADDIUPC emulation, plenty of other small fixes - ELF: ABI and FP fixes. - Allow for relocatable kernel and use that to support KASLR. - Fix CPC_BASE_ADDR mask - Plenty fo smp-cps, CM, R6 and M6250 fixes. - Make reset_control_ops const. - Fix kernel command line handling of leading whitespace. - Cleanups to cache handling. - Add brcm, bcm6345-l1-intc device tree bindings. - Use generic clkdev.h header - Remove CLK_IS_ROOT usage. - Misc small cleanups. - CM: Fix compilation error when !MIPS_CM - oprofile: Fix a preemption issue - Detect DSP ASE v3 support:1" * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (275 commits) MIPS: pic32mzda: fix getting timer clock rate. MIPS: ath79: fix regression in PCI window initialization MIPS: ath79: make ath79_ddr_ctrl_init() compatible for newer SoCs MIPS: Fix VZ probe gas errors with binutils <2.24 MIPS: perf: Fix I6400 event numbers MIPS: DEC: Export `ioasic_ssr_lock' to modules MIPS: MSA: Fix a link error on `_init_msa_upper' with older GCC MIPS: CM: Fix compilation error when !MIPS_CM MIPS: Fix genvdso error on rebuild USB: ohci-jz4740: Remove obsolete driver MIPS: JZ4740: Probe OHCI platform device via DT MIPS: JZ4740: Qi LB60: Remove support for AVT2 variant MIPS: pistachio: Determine SoC revision during boot MIPS: BMIPS: Adjust mips-hpt-frequency for BCM7435 mips: mt7620: fallback to SDRAM when syscfg0 does not have a valid value for the memory type MIPS: Prevent "restoration" of MSA context in non-MSA kernels MIPS: cevt-r4k: Dynamically calculate min_delta_ns MIPS: malta-time: Take seconds into account MIPS: malta-time: Start GIC count before syncing to RTC MIPS: Force CPUs to lose FP context during mode switches ...
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/Kconfig26
-rw-r--r--drivers/watchdog/Makefile2
-rw-r--r--drivers/watchdog/pic32-dmt.c257
-rw-r--r--drivers/watchdog/pic32-wdt.c263
4 files changed, 548 insertions, 0 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index fb947655badd..9c4143112e6c 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1475,6 +1475,32 @@ config MT7621_WDT
help
Hardware driver for the Mediatek/Ralink MT7621/8 SoC Watchdog Timer.
+config PIC32_WDT
+ tristate "Microchip PIC32 hardware watchdog"
+ select WATCHDOG_CORE
+ depends on MACH_PIC32
+ help
+ Watchdog driver for the built in watchdog hardware in a PIC32.
+
+ Configuration bits must be set appropriately for the watchdog to be
+ controlled by this driver.
+
+ To compile this driver as a loadable module, choose M here.
+ The module will be called pic32-wdt.
+
+config PIC32_DMT
+ tristate "Microchip PIC32 Deadman Timer"
+ select WATCHDOG_CORE
+ depends on MACH_PIC32
+ help
+ Watchdog driver for PIC32 instruction fetch counting timer. This specific
+ timer is typically be used in misson critical and safety critical
+ applications, where any single failure of the software functionality
+ and sequencing must be detected.
+
+ To compile this driver as a loadable module, choose M here.
+ The module will be called pic32-dmt.
+
# PARISC Architecture
# POWERPC Architecture
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index feb6270fdbde..9bde095ff691 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -157,6 +157,8 @@ obj-$(CONFIG_LANTIQ_WDT) += lantiq_wdt.o
obj-$(CONFIG_RALINK_WDT) += rt2880_wdt.o
obj-$(CONFIG_IMGPDC_WDT) += imgpdc_wdt.o
obj-$(CONFIG_MT7621_WDT) += mt7621_wdt.o
+obj-$(CONFIG_PIC32_WDT) += pic32-wdt.o
+obj-$(CONFIG_PIC32_DMT) += pic32-dmt.o
# PARISC Architecture
diff --git a/drivers/watchdog/pic32-dmt.c b/drivers/watchdog/pic32-dmt.c
new file mode 100644
index 000000000000..962f58c03353
--- /dev/null
+++ b/drivers/watchdog/pic32-dmt.c
@@ -0,0 +1,257 @@
+/*
+ * PIC32 deadman timer driver
+ *
+ * Purna Chandra Mandal <purna.mandal@microchip.com>
+ * Copyright (c) 2016, Microchip Technology Inc.
+ *
+ * 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.
+ */
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/watchdog.h>
+
+#include <asm/mach-pic32/pic32.h>
+
+/* Deadman Timer Regs */
+#define DMTCON_REG 0x00
+#define DMTPRECLR_REG 0x10
+#define DMTCLR_REG 0x20
+#define DMTSTAT_REG 0x30
+#define DMTCNT_REG 0x40
+#define DMTPSCNT_REG 0x60
+#define DMTPSINTV_REG 0x70
+
+/* Deadman Timer Regs fields */
+#define DMT_ON BIT(15)
+#define DMT_STEP1_KEY BIT(6)
+#define DMT_STEP2_KEY BIT(3)
+#define DMTSTAT_WINOPN BIT(0)
+#define DMTSTAT_EVENT BIT(5)
+#define DMTSTAT_BAD2 BIT(6)
+#define DMTSTAT_BAD1 BIT(7)
+
+/* Reset Control Register fields for watchdog */
+#define RESETCON_DMT_TIMEOUT BIT(5)
+
+struct pic32_dmt {
+ void __iomem *regs;
+ struct clk *clk;
+};
+
+static inline void dmt_enable(struct pic32_dmt *dmt)
+{
+ writel(DMT_ON, PIC32_SET(dmt->regs + DMTCON_REG));
+}
+
+static inline void dmt_disable(struct pic32_dmt *dmt)
+{
+ writel(DMT_ON, PIC32_CLR(dmt->regs + DMTCON_REG));
+ /*
+ * Cannot touch registers in the CPU cycle following clearing the
+ * ON bit.
+ */
+ nop();
+}
+
+static inline int dmt_bad_status(struct pic32_dmt *dmt)
+{
+ u32 val;
+
+ val = readl(dmt->regs + DMTSTAT_REG);
+ val &= (DMTSTAT_BAD1 | DMTSTAT_BAD2 | DMTSTAT_EVENT);
+ if (val)
+ return -EAGAIN;
+
+ return 0;
+}
+
+static inline int dmt_keepalive(struct pic32_dmt *dmt)
+{
+ u32 v;
+ u32 timeout = 500;
+
+ /* set pre-clear key */
+ writel(DMT_STEP1_KEY << 8, dmt->regs + DMTPRECLR_REG);
+
+ /* wait for DMT window to open */
+ while (--timeout) {
+ v = readl(dmt->regs + DMTSTAT_REG) & DMTSTAT_WINOPN;
+ if (v == DMTSTAT_WINOPN)
+ break;
+ }
+
+ /* apply key2 */
+ writel(DMT_STEP2_KEY, dmt->regs + DMTCLR_REG);
+
+ /* check whether keys are latched correctly */
+ return dmt_bad_status(dmt);
+}
+
+static inline u32 pic32_dmt_get_timeout_secs(struct pic32_dmt *dmt)
+{
+ unsigned long rate;
+
+ rate = clk_get_rate(dmt->clk);
+ if (rate)
+ return readl(dmt->regs + DMTPSCNT_REG) / rate;
+
+ return 0;
+}
+
+static inline u32 pic32_dmt_bootstatus(struct pic32_dmt *dmt)
+{
+ u32 v;
+ void __iomem *rst_base;
+
+ rst_base = ioremap(PIC32_BASE_RESET, 0x10);
+ if (!rst_base)
+ return 0;
+
+ v = readl(rst_base);
+
+ writel(RESETCON_DMT_TIMEOUT, PIC32_CLR(rst_base));
+
+ iounmap(rst_base);
+ return v & RESETCON_DMT_TIMEOUT;
+}
+
+static int pic32_dmt_start(struct watchdog_device *wdd)
+{
+ struct pic32_dmt *dmt = watchdog_get_drvdata(wdd);
+
+ dmt_enable(dmt);
+ return dmt_keepalive(dmt);
+}
+
+static int pic32_dmt_stop(struct watchdog_device *wdd)
+{
+ struct pic32_dmt *dmt = watchdog_get_drvdata(wdd);
+
+ dmt_disable(dmt);
+
+ return 0;
+}
+
+static int pic32_dmt_ping(struct watchdog_device *wdd)
+{
+ struct pic32_dmt *dmt = watchdog_get_drvdata(wdd);
+
+ return dmt_keepalive(dmt);
+}
+
+static const struct watchdog_ops pic32_dmt_fops = {
+ .owner = THIS_MODULE,
+ .start = pic32_dmt_start,
+ .stop = pic32_dmt_stop,
+ .ping = pic32_dmt_ping,
+};
+
+static const struct watchdog_info pic32_dmt_ident = {
+ .options = WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE,
+ .identity = "PIC32 Deadman Timer",
+};
+
+static struct watchdog_device pic32_dmt_wdd = {
+ .info = &pic32_dmt_ident,
+ .ops = &pic32_dmt_fops,
+};
+
+static int pic32_dmt_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct pic32_dmt *dmt;
+ struct resource *mem;
+ struct watchdog_device *wdd = &pic32_dmt_wdd;
+
+ dmt = devm_kzalloc(&pdev->dev, sizeof(*dmt), GFP_KERNEL);
+ if (IS_ERR(dmt))
+ return PTR_ERR(dmt);
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dmt->regs = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(dmt->regs))
+ return PTR_ERR(dmt->regs);
+
+ dmt->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(dmt->clk)) {
+ dev_err(&pdev->dev, "clk not found\n");
+ return PTR_ERR(dmt->clk);
+ }
+
+ ret = clk_prepare_enable(dmt->clk);
+ if (ret)
+ return ret;
+
+ wdd->timeout = pic32_dmt_get_timeout_secs(dmt);
+ if (!wdd->timeout) {
+ dev_err(&pdev->dev,
+ "failed to read watchdog register timeout\n");
+ ret = -EINVAL;
+ goto out_disable_clk;
+ }
+
+ dev_info(&pdev->dev, "timeout %d\n", wdd->timeout);
+
+ wdd->bootstatus = pic32_dmt_bootstatus(dmt) ? WDIOF_CARDRESET : 0;
+
+ watchdog_set_nowayout(wdd, WATCHDOG_NOWAYOUT);
+ watchdog_set_drvdata(wdd, dmt);
+
+ ret = watchdog_register_device(wdd);
+ if (ret) {
+ dev_err(&pdev->dev, "watchdog register failed, err %d\n", ret);
+ goto out_disable_clk;
+ }
+
+ platform_set_drvdata(pdev, wdd);
+ return 0;
+
+out_disable_clk:
+ clk_disable_unprepare(dmt->clk);
+ return ret;
+}
+
+static int pic32_dmt_remove(struct platform_device *pdev)
+{
+ struct watchdog_device *wdd = platform_get_drvdata(pdev);
+ struct pic32_dmt *dmt = watchdog_get_drvdata(wdd);
+
+ watchdog_unregister_device(wdd);
+ clk_disable_unprepare(dmt->clk);
+
+ return 0;
+}
+
+static const struct of_device_id pic32_dmt_of_ids[] = {
+ { .compatible = "microchip,pic32mzda-dmt",},
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pic32_dmt_of_ids);
+
+static struct platform_driver pic32_dmt_driver = {
+ .probe = pic32_dmt_probe,
+ .remove = pic32_dmt_remove,
+ .driver = {
+ .name = "pic32-dmt",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(pic32_dmt_of_ids),
+ }
+};
+
+module_platform_driver(pic32_dmt_driver);
+
+MODULE_AUTHOR("Purna Chandra Mandal <purna.mandal@microchip.com>");
+MODULE_DESCRIPTION("Microchip PIC32 DMT Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/watchdog/pic32-wdt.c b/drivers/watchdog/pic32-wdt.c
new file mode 100644
index 000000000000..6047aa89a4d3
--- /dev/null
+++ b/drivers/watchdog/pic32-wdt.c
@@ -0,0 +1,263 @@
+/*
+ * PIC32 watchdog driver
+ *
+ * Joshua Henderson <joshua.henderson@microchip.com>
+ * Copyright (c) 2016, Microchip Technology Inc.
+ *
+ * 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.
+ */
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/watchdog.h>
+
+#include <asm/mach-pic32/pic32.h>
+
+/* Watchdog Timer Registers */
+#define WDTCON_REG 0x00
+
+/* Watchdog Timer Control Register fields */
+#define WDTCON_WIN_EN BIT(0)
+#define WDTCON_RMCS_MASK 0x0003
+#define WDTCON_RMCS_SHIFT 0x0006
+#define WDTCON_RMPS_MASK 0x001F
+#define WDTCON_RMPS_SHIFT 0x0008
+#define WDTCON_ON BIT(15)
+#define WDTCON_CLR_KEY 0x5743
+
+/* Reset Control Register fields for watchdog */
+#define RESETCON_TIMEOUT_IDLE BIT(2)
+#define RESETCON_TIMEOUT_SLEEP BIT(3)
+#define RESETCON_WDT_TIMEOUT BIT(4)
+
+struct pic32_wdt {
+ void __iomem *regs;
+ void __iomem *rst_base;
+ struct clk *clk;
+};
+
+static inline bool pic32_wdt_is_win_enabled(struct pic32_wdt *wdt)
+{
+ return !!(readl(wdt->regs + WDTCON_REG) & WDTCON_WIN_EN);
+}
+
+static inline u32 pic32_wdt_get_post_scaler(struct pic32_wdt *wdt)
+{
+ u32 v = readl(wdt->regs + WDTCON_REG);
+
+ return (v >> WDTCON_RMPS_SHIFT) & WDTCON_RMPS_MASK;
+}
+
+static inline u32 pic32_wdt_get_clk_id(struct pic32_wdt *wdt)
+{
+ u32 v = readl(wdt->regs + WDTCON_REG);
+
+ return (v >> WDTCON_RMCS_SHIFT) & WDTCON_RMCS_MASK;
+}
+
+static int pic32_wdt_bootstatus(struct pic32_wdt *wdt)
+{
+ u32 v = readl(wdt->rst_base);
+
+ writel(RESETCON_WDT_TIMEOUT, PIC32_CLR(wdt->rst_base));
+
+ return v & RESETCON_WDT_TIMEOUT;
+}
+
+static u32 pic32_wdt_get_timeout_secs(struct pic32_wdt *wdt, struct device *dev)
+{
+ unsigned long rate;
+ u32 period, ps, terminal;
+
+ rate = clk_get_rate(wdt->clk);
+
+ dev_dbg(dev, "wdt: clk_id %d, clk_rate %lu (prescale)\n",
+ pic32_wdt_get_clk_id(wdt), rate);
+
+ /* default, prescaler of 32 (i.e. div-by-32) is implicit. */
+ rate >>= 5;
+ if (!rate)
+ return 0;
+
+ /* calculate terminal count from postscaler. */
+ ps = pic32_wdt_get_post_scaler(wdt);
+ terminal = BIT(ps);
+
+ /* find time taken (in secs) to reach terminal count */
+ period = terminal / rate;
+ dev_dbg(dev,
+ "wdt: clk_rate %lu (postscale) / terminal %d, timeout %dsec\n",
+ rate, terminal, period);
+
+ return period;
+}
+
+static void pic32_wdt_keepalive(struct pic32_wdt *wdt)
+{
+ /* write key through single half-word */
+ writew(WDTCON_CLR_KEY, wdt->regs + WDTCON_REG + 2);
+}
+
+static int pic32_wdt_start(struct watchdog_device *wdd)
+{
+ struct pic32_wdt *wdt = watchdog_get_drvdata(wdd);
+
+ writel(WDTCON_ON, PIC32_SET(wdt->regs + WDTCON_REG));
+ pic32_wdt_keepalive(wdt);
+
+ return 0;
+}
+
+static int pic32_wdt_stop(struct watchdog_device *wdd)
+{
+ struct pic32_wdt *wdt = watchdog_get_drvdata(wdd);
+
+ writel(WDTCON_ON, PIC32_CLR(wdt->regs + WDTCON_REG));
+
+ /*
+ * Cannot touch registers in the CPU cycle following clearing the
+ * ON bit.
+ */
+ nop();
+
+ return 0;
+}
+
+static int pic32_wdt_ping(struct watchdog_device *wdd)
+{
+ struct pic32_wdt *wdt = watchdog_get_drvdata(wdd);
+
+ pic32_wdt_keepalive(wdt);
+
+ return 0;
+}
+
+static const struct watchdog_ops pic32_wdt_fops = {
+ .owner = THIS_MODULE,
+ .start = pic32_wdt_start,
+ .stop = pic32_wdt_stop,
+ .ping = pic32_wdt_ping,
+};
+
+static const struct watchdog_info pic32_wdt_ident = {
+ .options = WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE | WDIOF_CARDRESET,
+ .identity = "PIC32 Watchdog",
+};
+
+static struct watchdog_device pic32_wdd = {
+ .info = &pic32_wdt_ident,
+ .ops = &pic32_wdt_fops,
+};
+
+static const struct of_device_id pic32_wdt_dt_ids[] = {
+ { .compatible = "microchip,pic32mzda-wdt", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pic32_wdt_dt_ids);
+
+static int pic32_wdt_drv_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct watchdog_device *wdd = &pic32_wdd;
+ struct pic32_wdt *wdt;
+ struct resource *mem;
+
+ wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
+ if (IS_ERR(wdt))
+ return PTR_ERR(wdt);
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ wdt->regs = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(wdt->regs))
+ return PTR_ERR(wdt->regs);
+
+ wdt->rst_base = devm_ioremap(&pdev->dev, PIC32_BASE_RESET, 0x10);
+ if (IS_ERR(wdt->rst_base))
+ return PTR_ERR(wdt->rst_base);
+
+ wdt->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(wdt->clk)) {
+ dev_err(&pdev->dev, "clk not found\n");
+ return PTR_ERR(wdt->clk);
+ }
+
+ ret = clk_prepare_enable(wdt->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "clk enable failed\n");
+ return ret;
+ }
+
+ if (pic32_wdt_is_win_enabled(wdt)) {
+ dev_err(&pdev->dev, "windowed-clear mode is not supported.\n");
+ ret = -ENODEV;
+ goto out_disable_clk;
+ }
+
+ wdd->timeout = pic32_wdt_get_timeout_secs(wdt, &pdev->dev);
+ if (!wdd->timeout) {
+ dev_err(&pdev->dev,
+ "failed to read watchdog register timeout\n");
+ ret = -EINVAL;
+ goto out_disable_clk;
+ }
+
+ dev_info(&pdev->dev, "timeout %d\n", wdd->timeout);
+
+ wdd->bootstatus = pic32_wdt_bootstatus(wdt) ? WDIOF_CARDRESET : 0;
+
+ watchdog_set_nowayout(wdd, WATCHDOG_NOWAYOUT);
+ watchdog_set_drvdata(wdd, wdt);
+
+ ret = watchdog_register_device(wdd);
+ if (ret) {
+ dev_err(&pdev->dev, "watchdog register failed, err %d\n", ret);
+ goto out_disable_clk;
+ }
+
+ platform_set_drvdata(pdev, wdd);
+
+ return 0;
+
+out_disable_clk:
+ clk_disable_unprepare(wdt->clk);
+
+ return ret;
+}
+
+static int pic32_wdt_drv_remove(struct platform_device *pdev)
+{
+ struct watchdog_device *wdd = platform_get_drvdata(pdev);
+ struct pic32_wdt *wdt = watchdog_get_drvdata(wdd);
+
+ watchdog_unregister_device(wdd);
+ clk_disable_unprepare(wdt->clk);
+
+ return 0;
+}
+
+static struct platform_driver pic32_wdt_driver = {
+ .probe = pic32_wdt_drv_probe,
+ .remove = pic32_wdt_drv_remove,
+ .driver = {
+ .name = "pic32-wdt",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(pic32_wdt_dt_ids),
+ }
+};
+
+module_platform_driver(pic32_wdt_driver);
+
+MODULE_AUTHOR("Joshua Henderson <joshua.henderson@microchip.com>");
+MODULE_DESCRIPTION("Microchip PIC32 Watchdog Timer");
+MODULE_LICENSE("GPL");