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32 results

alix.c

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  • ingenic-timer.c 8.60 KiB
    // SPDX-License-Identifier: GPL-2.0
    /*
     * JZ47xx SoCs TCU IRQ driver
     * Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net>
     */
    
    #include <linux/bitops.h>
    #include <linux/clk.h>
    #include <linux/clockchips.h>
    #include <linux/clocksource.h>
    #include <linux/interrupt.h>
    #include <linux/mfd/ingenic-tcu.h>
    #include <linux/mfd/syscon.h>
    #include <linux/of.h>
    #include <linux/of_address.h>
    #include <linux/of_irq.h>
    #include <linux/of_platform.h>
    #include <linux/platform_device.h>
    #include <linux/regmap.h>
    #include <linux/sched_clock.h>
    
    #include <dt-bindings/clock/ingenic,tcu.h>
    
    struct ingenic_soc_info {
    	unsigned int num_channels;
    };
    
    struct ingenic_tcu {
    	struct regmap *map;
    	struct clk *timer_clk, *cs_clk;
    	unsigned int timer_channel, cs_channel;
    	struct clock_event_device cevt;
    	struct clocksource cs;
    	char name[4];
    	unsigned long pwm_channels_mask;
    };
    
    static struct ingenic_tcu *ingenic_tcu;
    
    static u64 notrace ingenic_tcu_timer_read(void)
    {
    	struct ingenic_tcu *tcu = ingenic_tcu;
    	unsigned int count;
    
    	regmap_read(tcu->map, TCU_REG_TCNTc(tcu->cs_channel), &count);
    
    	return count;
    }
    
    static u64 notrace ingenic_tcu_timer_cs_read(struct clocksource *cs)
    {
    	return ingenic_tcu_timer_read();
    }
    
    static inline struct ingenic_tcu *to_ingenic_tcu(struct clock_event_device *evt)
    {
    	return container_of(evt, struct ingenic_tcu, cevt);
    }
    
    static int ingenic_tcu_cevt_set_state_shutdown(struct clock_event_device *evt)
    {
    	struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
    
    	regmap_write(tcu->map, TCU_REG_TECR, BIT(tcu->timer_channel));
    
    	return 0;
    }
    
    static int ingenic_tcu_cevt_set_next(unsigned long next,
    				     struct clock_event_device *evt)
    {
    	struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
    
    	if (next > 0xffff)
    		return -EINVAL;
    
    	regmap_write(tcu->map, TCU_REG_TDFRc(tcu->timer_channel), next);
    	regmap_write(tcu->map, TCU_REG_TCNTc(tcu->timer_channel), 0);
    	regmap_write(tcu->map, TCU_REG_TESR, BIT(tcu->timer_channel));
    
    	return 0;
    }
    
    static irqreturn_t ingenic_tcu_cevt_cb(int irq, void *dev_id)
    {
    	struct clock_event_device *evt = dev_id;
    	struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
    
    	regmap_write(tcu->map, TCU_REG_TECR, BIT(tcu->timer_channel));
    
    	if (evt->event_handler)
    		evt->event_handler(evt);
    
    	return IRQ_HANDLED;
    }
    
    static struct clk * __init ingenic_tcu_get_clock(struct device_node *np, int id)
    {
    	struct of_phandle_args args;
    
    	args.np = np;
    	args.args_count = 1;
    	args.args[0] = id;
    
    	return of_clk_get_from_provider(&args);
    }
    
    static int __init ingenic_tcu_timer_init(struct device_node *np,
    					 struct ingenic_tcu *tcu)
    {
    	unsigned int timer_virq, channel = tcu->timer_channel;
    	struct irq_domain *domain;
    	unsigned long rate;
    	int err;
    
    	tcu->timer_clk = ingenic_tcu_get_clock(np, channel);
    	if (IS_ERR(tcu->timer_clk))
    		return PTR_ERR(tcu->timer_clk);
    
    	err = clk_prepare_enable(tcu->timer_clk);
    	if (err)
    		goto err_clk_put;
    
    	rate = clk_get_rate(tcu->timer_clk);
    	if (!rate) {
    		err = -EINVAL;
    		goto err_clk_disable;
    	}
    
    	domain = irq_find_host(np);
    	if (!domain) {
    		err = -ENODEV;
    		goto err_clk_disable;
    	}
    
    	timer_virq = irq_create_mapping(domain, channel);
    	if (!timer_virq) {
    		err = -EINVAL;
    		goto err_clk_disable;
    	}
    
    	snprintf(tcu->name, sizeof(tcu->name), "TCU");
    
    	err = request_irq(timer_virq, ingenic_tcu_cevt_cb, IRQF_TIMER,
    			  tcu->name, &tcu->cevt);
    	if (err)
    		goto err_irq_dispose_mapping;
    
    	tcu->cevt.cpumask = cpumask_of(smp_processor_id());
    	tcu->cevt.features = CLOCK_EVT_FEAT_ONESHOT;
    	tcu->cevt.name = tcu->name;
    	tcu->cevt.rating = 200;
    	tcu->cevt.set_state_shutdown = ingenic_tcu_cevt_set_state_shutdown;
    	tcu->cevt.set_next_event = ingenic_tcu_cevt_set_next;
    
    	clockevents_config_and_register(&tcu->cevt, rate, 10, 0xffff);
    
    	return 0;
    
    err_irq_dispose_mapping:
    	irq_dispose_mapping(timer_virq);
    err_clk_disable:
    	clk_disable_unprepare(tcu->timer_clk);
    err_clk_put:
    	clk_put(tcu->timer_clk);
    	return err;
    }
    
    static int __init ingenic_tcu_clocksource_init(struct device_node *np,
    					       struct ingenic_tcu *tcu)
    {
    	unsigned int channel = tcu->cs_channel;
    	struct clocksource *cs = &tcu->cs;
    	unsigned long rate;
    	int err;
    
    	tcu->cs_clk = ingenic_tcu_get_clock(np, channel);
    	if (IS_ERR(tcu->cs_clk))
    		return PTR_ERR(tcu->cs_clk);
    
    	err = clk_prepare_enable(tcu->cs_clk);
    	if (err)
    		goto err_clk_put;
    
    	rate = clk_get_rate(tcu->cs_clk);
    	if (!rate) {
    		err = -EINVAL;
    		goto err_clk_disable;
    	}
    
    	/* Reset channel */
    	regmap_update_bits(tcu->map, TCU_REG_TCSRc(channel),
    			   0xffff & ~TCU_TCSR_RESERVED_BITS, 0);
    
    	/* Reset counter */
    	regmap_write(tcu->map, TCU_REG_TDFRc(channel), 0xffff);
    	regmap_write(tcu->map, TCU_REG_TCNTc(channel), 0);
    
    	/* Enable channel */
    	regmap_write(tcu->map, TCU_REG_TESR, BIT(channel));
    
    	cs->name = "ingenic-timer";
    	cs->rating = 200;
    	cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
    	cs->mask = CLOCKSOURCE_MASK(16);
    	cs->read = ingenic_tcu_timer_cs_read;
    
    	err = clocksource_register_hz(cs, rate);
    	if (err)
    		goto err_clk_disable;
    
    	return 0;
    
    err_clk_disable:
    	clk_disable_unprepare(tcu->cs_clk);
    err_clk_put:
    	clk_put(tcu->cs_clk);
    	return err;
    }
    
    static const struct ingenic_soc_info jz4740_soc_info = {
    	.num_channels = 8,
    };
    
    static const struct ingenic_soc_info jz4725b_soc_info = {
    	.num_channels = 6,
    };
    
    static const struct of_device_id ingenic_tcu_of_match[] = {
    	{ .compatible = "ingenic,jz4740-tcu", .data = &jz4740_soc_info, },
    	{ .compatible = "ingenic,jz4725b-tcu", .data = &jz4725b_soc_info, },
    	{ .compatible = "ingenic,jz4770-tcu", .data = &jz4740_soc_info, },
    	{ .compatible = "ingenic,x1000-tcu", .data = &jz4740_soc_info, },
    	{ /* sentinel */ }
    };
    
    static int __init ingenic_tcu_init(struct device_node *np)
    {
    	const struct of_device_id *id = of_match_node(ingenic_tcu_of_match, np);
    	const struct ingenic_soc_info *soc_info = id->data;
    	struct ingenic_tcu *tcu;
    	struct regmap *map;
    	long rate;
    	int ret;
    
    	of_node_clear_flag(np, OF_POPULATED);
    
    	map = device_node_to_regmap(np);
    	if (IS_ERR(map))
    		return PTR_ERR(map);
    
    	tcu = kzalloc(sizeof(*tcu), GFP_KERNEL);
    	if (!tcu)
    		return -ENOMEM;
    
    	/* Enable all TCU channels for PWM use by default except channels 0/1 */
    	tcu->pwm_channels_mask = GENMASK(soc_info->num_channels - 1, 2);
    	of_property_read_u32(np, "ingenic,pwm-channels-mask",
    			     (u32 *)&tcu->pwm_channels_mask);
    
    	/* Verify that we have at least two free channels */
    	if (hweight8(tcu->pwm_channels_mask) > soc_info->num_channels - 2) {
    		pr_crit("%s: Invalid PWM channel mask: 0x%02lx\n", __func__,
    			tcu->pwm_channels_mask);
    		ret = -EINVAL;
    		goto err_free_ingenic_tcu;
    	}
    
    	tcu->map = map;
    	ingenic_tcu = tcu;
    
    	tcu->timer_channel = find_first_zero_bit(&tcu->pwm_channels_mask,
    						 soc_info->num_channels);
    	tcu->cs_channel = find_next_zero_bit(&tcu->pwm_channels_mask,
    					     soc_info->num_channels,
    					     tcu->timer_channel + 1);
    
    	ret = ingenic_tcu_clocksource_init(np, tcu);
    	if (ret) {
    		pr_crit("%s: Unable to init clocksource: %d\n", __func__, ret);
    		goto err_free_ingenic_tcu;
    	}
    
    	ret = ingenic_tcu_timer_init(np, tcu);
    	if (ret)
    		goto err_tcu_clocksource_cleanup;
    
    	/* Register the sched_clock at the end as there's no way to undo it */
    	rate = clk_get_rate(tcu->cs_clk);
    	sched_clock_register(ingenic_tcu_timer_read, 16, rate);
    
    	return 0;
    
    err_tcu_clocksource_cleanup:
    	clocksource_unregister(&tcu->cs);
    	clk_disable_unprepare(tcu->cs_clk);
    	clk_put(tcu->cs_clk);
    err_free_ingenic_tcu:
    	kfree(tcu);
    	return ret;
    }
    
    TIMER_OF_DECLARE(jz4740_tcu_intc,  "ingenic,jz4740-tcu",  ingenic_tcu_init);
    TIMER_OF_DECLARE(jz4725b_tcu_intc, "ingenic,jz4725b-tcu", ingenic_tcu_init);
    TIMER_OF_DECLARE(jz4770_tcu_intc,  "ingenic,jz4770-tcu",  ingenic_tcu_init);
    TIMER_OF_DECLARE(x1000_tcu_intc,  "ingenic,x1000-tcu",  ingenic_tcu_init);
    
    static int __init ingenic_tcu_probe(struct platform_device *pdev)
    {
    	platform_set_drvdata(pdev, ingenic_tcu);
    
    	return 0;
    }
    
    static int __maybe_unused ingenic_tcu_suspend(struct device *dev)
    {
    	struct ingenic_tcu *tcu = dev_get_drvdata(dev);
    
    	clk_disable(tcu->cs_clk);
    	clk_disable(tcu->timer_clk);
    	return 0;
    }
    
    static int __maybe_unused ingenic_tcu_resume(struct device *dev)
    {
    	struct ingenic_tcu *tcu = dev_get_drvdata(dev);
    	int ret;
    
    	ret = clk_enable(tcu->timer_clk);
    	if (ret)
    		return ret;
    
    	ret = clk_enable(tcu->cs_clk);
    	if (ret) {
    		clk_disable(tcu->timer_clk);
    		return ret;
    	}
    
    	return 0;
    }
    
    static const struct dev_pm_ops __maybe_unused ingenic_tcu_pm_ops = {
    	/* _noirq: We want the TCU clocks to be gated last / ungated first */
    	.suspend_noirq = ingenic_tcu_suspend,
    	.resume_noirq  = ingenic_tcu_resume,
    };
    
    static struct platform_driver ingenic_tcu_driver = {
    	.driver = {
    		.name	= "ingenic-tcu-timer",
    #ifdef CONFIG_PM_SLEEP
    		.pm	= &ingenic_tcu_pm_ops,
    #endif
    		.of_match_table = ingenic_tcu_of_match,
    	},
    };
    builtin_platform_driver_probe(ingenic_tcu_driver, ingenic_tcu_probe);