1 // SPDX-License-Identifier: GPL-2.0-or-later
19 #include <asm/mach-pic32/pic32.h>
49 	writel(DMT_ON, PIC32_SET(dmt->regs + DMTCON_REG));  in dmt_enable()
54 	writel(DMT_ON, PIC32_CLR(dmt->regs + DMTCON_REG));  in dmt_disable()
66 	val = readl(dmt->regs + DMTSTAT_REG);  in dmt_bad_status()
69 		return -EAGAIN;  in dmt_bad_status()
77 	u32 timeout = 500;  in dmt_keepalive()  local
79 	/* set pre-clear key */  in dmt_keepalive()
80 	writel(DMT_STEP1_KEY << 8, dmt->regs + DMTPRECLR_REG);  in dmt_keepalive()
83 	while (--timeout) {  in dmt_keepalive()
84 		v = readl(dmt->regs + DMTSTAT_REG) & DMTSTAT_WINOPN;  in dmt_keepalive()
90 	writel(DMT_STEP2_KEY, dmt->regs + DMTCLR_REG);  in dmt_keepalive()
100 	rate = clk_get_rate(dmt->clk);  in pic32_dmt_get_timeout_secs()
102 		return readl(dmt->regs + DMTPSCNT_REG) / rate;  in pic32_dmt_get_timeout_secs()
168 	struct device *dev = &pdev->dev;  in pic32_dmt_probe()
175 		return -ENOMEM;  in pic32_dmt_probe()
177 	dmt->regs = devm_platform_ioremap_resource(pdev, 0);  in pic32_dmt_probe()
178 	if (IS_ERR(dmt->regs))  in pic32_dmt_probe()
179 		return PTR_ERR(dmt->regs);  in pic32_dmt_probe()
181 	dmt->clk = devm_clk_get_enabled(dev, NULL);  in pic32_dmt_probe()
182 	if (IS_ERR(dmt->clk)) {  in pic32_dmt_probe()
184 		return PTR_ERR(dmt->clk);  in pic32_dmt_probe()
187 	wdd->timeout = pic32_dmt_get_timeout_secs(dmt);  in pic32_dmt_probe()
188 	if (!wdd->timeout) {  in pic32_dmt_probe()
189 		dev_err(dev, "failed to read watchdog register timeout\n");  in pic32_dmt_probe()
190 		return -EINVAL;  in pic32_dmt_probe()
193 	dev_info(dev, "timeout %d\n", wdd->timeout);  in pic32_dmt_probe()
195 	wdd->bootstatus = pic32_dmt_bootstatus(dmt) ? WDIOF_CARDRESET : 0;  in pic32_dmt_probe()
209 	{ .compatible = "microchip,pic32mzda-dmt",},
217 		.name		= "pic32-dmt",