1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2022 Hewlett-Packard Enterprise Development Company, L.P. */
19 /* TCS Stands for Timer Control/Status: these are masks to be used in */
20 /* the Timer Count Registers */
48 	struct gxp_timer *timer = to_gxp_timer(evt_dev);  in gxp_time_set_next_event()  local
51 	writeb_relaxed(MASK_TCS_TC, timer->control);  in gxp_time_set_next_event()
52 	writel_relaxed(event, timer->counter);  in gxp_time_set_next_event()
53 	writeb_relaxed(MASK_TCS_TC | MASK_TCS_ENABLE, timer->control);  in gxp_time_set_next_event()
60 	struct gxp_timer *timer = (struct gxp_timer *)dev_id;  in gxp_timer_interrupt()  local
62 	if (!(readb_relaxed(timer->control) & MASK_TCS_TC))  in gxp_timer_interrupt()
65 	writeb_relaxed(MASK_TCS_TC, timer->control);  in gxp_timer_interrupt()
67 	timer->evt.event_handler(&timer->evt);  in gxp_timer_interrupt()
81 		ret = -ENOMEM;  in gxp_timer_init()
101 		ret = -ENXIO;  in gxp_timer_init()
102 		pr_err("Can't map timer base registers");  in gxp_timer_init()
106 	/* Set the offsets to the clock register and timer registers */  in gxp_timer_init()
107 	gxp_timer->counter = base + GXP_TIMER_CNT_OFS;  in gxp_timer_init()
108 	gxp_timer->control = base + GXP_TIMER_CTRL_OFS;  in gxp_timer_init()
111 	gxp_timer->evt.name = node->name;  in gxp_timer_init()
112 	gxp_timer->evt.rating = 300;  in gxp_timer_init()
113 	gxp_timer->evt.features = CLOCK_EVT_FEAT_ONESHOT;  in gxp_timer_init()
114 	gxp_timer->evt.set_next_event = gxp_time_set_next_event;  in gxp_timer_init()
115 	gxp_timer->evt.cpumask = cpumask_of(0);  in gxp_timer_init()
119 		ret = -EINVAL;  in gxp_timer_init()
120 		pr_err("GXP Timer Can't parse IRQ %d", irq);  in gxp_timer_init()
126 	ret = clocksource_mmio_init(system_clock, node->name, freq,  in gxp_timer_init()
137 		ret = -EINVAL;  in gxp_timer_init()
142 	clockevents_config_and_register(&gxp_timer->evt, TIMER0_FREQ,  in gxp_timer_init()
146 			  node->name, gxp_timer);  in gxp_timer_init()
152 	pr_debug("gxp: system timer (irq = %d)\n", irq);  in gxp_timer_init()
167  * This probe gets called after the timer is already up and running. This will create
174 	struct device *dev = &pdev->dev;  in gxp_timer_probe()
178 		pr_err("Gxp Timer not initialized, cannot create watchdog");  in gxp_timer_probe()
179 		return -ENOMEM;  in gxp_timer_probe()
182 	gxp_watchdog_device = platform_device_alloc("gxp-wdt", -1);  in gxp_timer_probe()
184 		pr_err("Timer failed to allocate gxp-wdt");  in gxp_timer_probe()
185 		return -ENOMEM;  in gxp_timer_probe()
189 	gxp_watchdog_device->dev.platform_data = gxp_timer->counter;  in gxp_timer_probe()
190 	gxp_watchdog_device->dev.parent = dev;  in gxp_timer_probe()
200 	{ .compatible = "hpe,gxp-timer", },
207 		.name = "gxp-timer",
215 TIMER_OF_DECLARE(gxp, "hpe,gxp-timer", gxp_timer_init);