Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Paul Cercueil | 1575 | 100.00% | 1 | 100.00% |
Total | 1575 | 1 |
// 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, }, { /* 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); 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);
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