drivers/watchdog/sbsa_gwdt.c

54 #define DRV_NAME		"sbsa-gwdt"
134 static u64 sbsa_gwdt_reg_read(struct sbsa_gwdt *gwdt)
136 	if (gwdt->version == 0)
137 		return readl(gwdt->control_base + SBSA_GWDT_WOR);
139 		return lo_hi_readq(gwdt->control_base + SBSA_GWDT_WOR);
142 static void sbsa_gwdt_reg_write(u64 val, struct sbsa_gwdt *gwdt)
144 	if (gwdt->version == 0)
145 		writel((u32)val, gwdt->control_base + SBSA_GWDT_WOR);
147 		lo_hi_writeq(val, gwdt->control_base + SBSA_GWDT_WOR);
156 	struct sbsa_gwdt *gwdt = watchdog_get_drvdata(wdd);
162 		sbsa_gwdt_reg_write((u64)gwdt->clk * timeout, gwdt);
169 		sbsa_gwdt_reg_write(((u64)gwdt->clk / 2) * timeout, gwdt);
193 	if (gwdt->need_ws0_race_workaround)
201 	struct sbsa_gwdt *gwdt = watchdog_get_drvdata(wdd);
210 	    !(readl(gwdt->control_base + SBSA_GWDT_WCS) & SBSA_GWDT_WCS_WS0))
211 		timeleft += sbsa_gwdt_reg_read(gwdt);
213 	timeleft += lo_hi_readq(gwdt->control_base + SBSA_GWDT_WCV) -
216 	do_div(timeleft, gwdt->clk);
223 	struct sbsa_gwdt *gwdt = watchdog_get_drvdata(wdd);
229 	writel(0, gwdt->refresh_base + SBSA_GWDT_WRR);
236 	struct sbsa_gwdt *gwdt = watchdog_get_drvdata(wdd);
239 	iidr = readl(gwdt->control_base + SBSA_GWDT_W_IIDR);
243 	gwdt->version = ver;
244 	gwdt->need_ws0_race_workaround =
250 	struct sbsa_gwdt *gwdt = watchdog_get_drvdata(wdd);
253 	writel(SBSA_GWDT_WCS_EN, gwdt->control_base + SBSA_GWDT_WCS);
260 	struct sbsa_gwdt *gwdt = watchdog_get_drvdata(wdd);
263 	writel(0, gwdt->control_base + SBSA_GWDT_WCS);
297 	struct sbsa_gwdt *gwdt;
301 	gwdt = devm_kzalloc(dev, sizeof(*gwdt), GFP_KERNEL);
302 	if (!gwdt)
304 	platform_set_drvdata(pdev, gwdt);
319 	gwdt->clk = arch_timer_get_cntfrq();
320 	gwdt->refresh_base = rf_base;
321 	gwdt->control_base = cf_base;
323 	wdd = &gwdt->wdd;
329 	watchdog_set_drvdata(wdd, gwdt);
332 	if (gwdt->version == 0)
333 		wdd->max_hw_heartbeat_ms = U32_MAX / gwdt->clk * 1000;
335 		wdd->max_hw_heartbeat_ms = GENMASK_ULL(47, 0) / gwdt->clk * 1000;
337 	if (gwdt->need_ws0_race_workaround) {
366 					     pdev->name, gwdt)) {
396 		 wdd->timeout, gwdt->clk, action,
405 	struct sbsa_gwdt *gwdt = dev_get_drvdata(dev);
407 	if (watchdog_hw_running(&gwdt->wdd))
408 		sbsa_gwdt_stop(&gwdt->wdd);
416 	struct sbsa_gwdt *gwdt = dev_get_drvdata(dev);
418 	if (watchdog_hw_running(&gwdt->wdd))
419 		sbsa_gwdt_start(&gwdt->wdd);
429 	{ .compatible = "arm,sbsa-gwdt", },