1 // SPDX-License-Identifier: GPL-2.0-only
3  * Ralink RT2880 timer
11 #include <linux/timer.h>
15 #include <asm/mach-ralink/ralink_regs.h>
26 #define TMR0CTL_PRESCALE_VAL		(0xf - TMR0CTL_PRESCALER)
39 	__raw_writel(val, rt->membase + reg);  in rt_timer_w32()
44 	return __raw_readl(rt->membase + reg);  in rt_timer_r32()
51 	rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div);  in rt_timer_irq()
60 	int err = request_irq(rt->irq, rt_timer_irq, 0,  in rt_timer_request()
61 						dev_name(rt->dev), rt);  in rt_timer_request()
63 		dev_err(rt->dev, "failed to request irq\n");  in rt_timer_request()
73 	if (rt->timer_freq < divisor)  in rt_timer_config()
74 		rt->timer_div = rt->timer_freq;  in rt_timer_config()
76 		rt->timer_div = divisor;  in rt_timer_config()
78 	rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div);  in rt_timer_config()
87 	rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div);  in rt_timer_enable()
101 	rt = devm_kzalloc(&pdev->dev, sizeof(*rt), GFP_KERNEL);  in rt_timer_probe()
103 		dev_err(&pdev->dev, "failed to allocate memory\n");  in rt_timer_probe()
104 		return -ENOMEM;  in rt_timer_probe()
107 	rt->irq = platform_get_irq(pdev, 0);  in rt_timer_probe()
108 	if (rt->irq < 0)  in rt_timer_probe()
109 		return rt->irq;  in rt_timer_probe()
111 	rt->membase = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);  in rt_timer_probe()
112 	if (IS_ERR(rt->membase))  in rt_timer_probe()
113 		return PTR_ERR(rt->membase);  in rt_timer_probe()
115 	clk = devm_clk_get(&pdev->dev, NULL);  in rt_timer_probe()
117 		dev_err(&pdev->dev, "failed get clock rate\n");  in rt_timer_probe()
121 	rt->timer_freq = clk_get_rate(clk) / TMR0CTL_PRESCALE_DIV;  in rt_timer_probe()
122 	if (!rt->timer_freq)  in rt_timer_probe()
123 		return -EINVAL;  in rt_timer_probe()
125 	rt->dev = &pdev->dev;  in rt_timer_probe()
132 	dev_info(&pdev->dev, "maximum frequency is %luHz\n", rt->timer_freq);  in rt_timer_probe()
138 	{ .compatible = "ralink,rt2880-timer" },
145 		.name			= "rt-timer",