clocksource: Add a new timer-ingenic driver
This driver handles the TCU (Timer Counter Unit) present on the Ingenic JZ47xx SoCs, and provides the kernel with a system timer, a clocksource and a sched_clock. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Tested-by: Artur Rojek <contact@artur-rojek.eu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Lee Jones <lee.jones@linaro.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Michael Turquette <mturquette@baylibre.com> Cc: Stephen Boyd <sboyd@kernel.org> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Rob Herring <robh+dt@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: linux-mips@vger.kernel.org Cc: linux-clk@vger.kernel.org Cc: od@zcrc.me
This commit is contained in:
Paul Cercueil
Paul Burton
parent
9536eba03e
commit
34e9368301
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@ -685,4 +685,15 @@ config MILBEAUT_TIMER
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help
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Enables the support for Milbeaut timer driver.
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config INGENIC_TIMER
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bool "Clocksource/timer using the TCU in Ingenic JZ SoCs"
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default MACH_INGENIC
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depends on MIPS || COMPILE_TEST
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depends on COMMON_CLK
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select MFD_SYSCON
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select TIMER_OF
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select IRQ_DOMAIN
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help
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Support for the timer/counter unit of the Ingenic JZ SoCs.
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endmenu
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@ -80,6 +80,7 @@ obj-$(CONFIG_ASM9260_TIMER) += asm9260_timer.o
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obj-$(CONFIG_H8300_TMR8) += h8300_timer8.o
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obj-$(CONFIG_H8300_TMR16) += h8300_timer16.o
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obj-$(CONFIG_H8300_TPU) += h8300_tpu.o
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obj-$(CONFIG_INGENIC_TIMER) += ingenic-timer.o
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obj-$(CONFIG_CLKSRC_ST_LPC) += clksrc_st_lpc.o
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obj-$(CONFIG_X86_NUMACHIP) += numachip.o
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obj-$(CONFIG_ATCPIT100_TIMER) += timer-atcpit100.o
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@ -0,0 +1,356 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* JZ47xx SoCs TCU IRQ driver
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* Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net>
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*/
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#include <linux/bitops.h>
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#include <linux/clk.h>
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#include <linux/clockchips.h>
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#include <linux/clocksource.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/ingenic-tcu.h>
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#include <linux/mfd/syscon.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/sched_clock.h>
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#include <dt-bindings/clock/ingenic,tcu.h>
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struct ingenic_soc_info {
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unsigned int num_channels;
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};
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struct ingenic_tcu {
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struct regmap *map;
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struct clk *timer_clk, *cs_clk;
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unsigned int timer_channel, cs_channel;
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struct clock_event_device cevt;
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struct clocksource cs;
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char name[4];
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unsigned long pwm_channels_mask;
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};
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static struct ingenic_tcu *ingenic_tcu;
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static u64 notrace ingenic_tcu_timer_read(void)
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{
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struct ingenic_tcu *tcu = ingenic_tcu;
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unsigned int count;
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regmap_read(tcu->map, TCU_REG_TCNTc(tcu->cs_channel), &count);
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return count;
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}
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static u64 notrace ingenic_tcu_timer_cs_read(struct clocksource *cs)
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{
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return ingenic_tcu_timer_read();
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}
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static inline struct ingenic_tcu *to_ingenic_tcu(struct clock_event_device *evt)
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{
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return container_of(evt, struct ingenic_tcu, cevt);
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}
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static int ingenic_tcu_cevt_set_state_shutdown(struct clock_event_device *evt)
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{
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struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
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regmap_write(tcu->map, TCU_REG_TECR, BIT(tcu->timer_channel));
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return 0;
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}
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static int ingenic_tcu_cevt_set_next(unsigned long next,
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struct clock_event_device *evt)
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{
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struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
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if (next > 0xffff)
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return -EINVAL;
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regmap_write(tcu->map, TCU_REG_TDFRc(tcu->timer_channel), next);
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regmap_write(tcu->map, TCU_REG_TCNTc(tcu->timer_channel), 0);
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regmap_write(tcu->map, TCU_REG_TESR, BIT(tcu->timer_channel));
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return 0;
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}
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static irqreturn_t ingenic_tcu_cevt_cb(int irq, void *dev_id)
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{
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struct clock_event_device *evt = dev_id;
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struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
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regmap_write(tcu->map, TCU_REG_TECR, BIT(tcu->timer_channel));
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if (evt->event_handler)
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evt->event_handler(evt);
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return IRQ_HANDLED;
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}
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static struct clk * __init ingenic_tcu_get_clock(struct device_node *np, int id)
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{
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struct of_phandle_args args;
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args.np = np;
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args.args_count = 1;
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args.args[0] = id;
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return of_clk_get_from_provider(&args);
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}
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static int __init ingenic_tcu_timer_init(struct device_node *np,
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struct ingenic_tcu *tcu)
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{
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unsigned int timer_virq, channel = tcu->timer_channel;
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struct irq_domain *domain;
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unsigned long rate;
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int err;
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tcu->timer_clk = ingenic_tcu_get_clock(np, channel);
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if (IS_ERR(tcu->timer_clk))
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return PTR_ERR(tcu->timer_clk);
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err = clk_prepare_enable(tcu->timer_clk);
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if (err)
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goto err_clk_put;
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rate = clk_get_rate(tcu->timer_clk);
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if (!rate) {
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err = -EINVAL;
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goto err_clk_disable;
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}
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domain = irq_find_host(np);
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if (!domain) {
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err = -ENODEV;
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goto err_clk_disable;
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}
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timer_virq = irq_create_mapping(domain, channel);
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if (!timer_virq) {
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err = -EINVAL;
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goto err_clk_disable;
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}
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snprintf(tcu->name, sizeof(tcu->name), "TCU");
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err = request_irq(timer_virq, ingenic_tcu_cevt_cb, IRQF_TIMER,
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tcu->name, &tcu->cevt);
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if (err)
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goto err_irq_dispose_mapping;
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tcu->cevt.cpumask = cpumask_of(smp_processor_id());
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tcu->cevt.features = CLOCK_EVT_FEAT_ONESHOT;
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tcu->cevt.name = tcu->name;
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tcu->cevt.rating = 200;
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tcu->cevt.set_state_shutdown = ingenic_tcu_cevt_set_state_shutdown;
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tcu->cevt.set_next_event = ingenic_tcu_cevt_set_next;
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clockevents_config_and_register(&tcu->cevt, rate, 10, 0xffff);
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return 0;
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err_irq_dispose_mapping:
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irq_dispose_mapping(timer_virq);
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err_clk_disable:
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clk_disable_unprepare(tcu->timer_clk);
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err_clk_put:
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clk_put(tcu->timer_clk);
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return err;
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}
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static int __init ingenic_tcu_clocksource_init(struct device_node *np,
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struct ingenic_tcu *tcu)
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{
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unsigned int channel = tcu->cs_channel;
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struct clocksource *cs = &tcu->cs;
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unsigned long rate;
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int err;
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tcu->cs_clk = ingenic_tcu_get_clock(np, channel);
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if (IS_ERR(tcu->cs_clk))
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return PTR_ERR(tcu->cs_clk);
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err = clk_prepare_enable(tcu->cs_clk);
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if (err)
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goto err_clk_put;
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rate = clk_get_rate(tcu->cs_clk);
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if (!rate) {
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err = -EINVAL;
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goto err_clk_disable;
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}
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/* Reset channel */
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regmap_update_bits(tcu->map, TCU_REG_TCSRc(channel),
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0xffff & ~TCU_TCSR_RESERVED_BITS, 0);
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/* Reset counter */
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regmap_write(tcu->map, TCU_REG_TDFRc(channel), 0xffff);
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regmap_write(tcu->map, TCU_REG_TCNTc(channel), 0);
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/* Enable channel */
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regmap_write(tcu->map, TCU_REG_TESR, BIT(channel));
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cs->name = "ingenic-timer";
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cs->rating = 200;
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cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
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cs->mask = CLOCKSOURCE_MASK(16);
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cs->read = ingenic_tcu_timer_cs_read;
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err = clocksource_register_hz(cs, rate);
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if (err)
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goto err_clk_disable;
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return 0;
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err_clk_disable:
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clk_disable_unprepare(tcu->cs_clk);
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err_clk_put:
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clk_put(tcu->cs_clk);
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return err;
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}
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static const struct ingenic_soc_info jz4740_soc_info = {
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.num_channels = 8,
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};
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static const struct ingenic_soc_info jz4725b_soc_info = {
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.num_channels = 6,
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};
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static const struct of_device_id ingenic_tcu_of_match[] = {
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{ .compatible = "ingenic,jz4740-tcu", .data = &jz4740_soc_info, },
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{ .compatible = "ingenic,jz4725b-tcu", .data = &jz4725b_soc_info, },
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{ .compatible = "ingenic,jz4770-tcu", .data = &jz4740_soc_info, },
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{ /* sentinel */ }
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};
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static int __init ingenic_tcu_init(struct device_node *np)
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{
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const struct of_device_id *id = of_match_node(ingenic_tcu_of_match, np);
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const struct ingenic_soc_info *soc_info = id->data;
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struct ingenic_tcu *tcu;
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struct regmap *map;
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long rate;
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int ret;
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of_node_clear_flag(np, OF_POPULATED);
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map = device_node_to_regmap(np);
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if (IS_ERR(map))
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return PTR_ERR(map);
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tcu = kzalloc(sizeof(*tcu), GFP_KERNEL);
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if (!tcu)
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return -ENOMEM;
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/* Enable all TCU channels for PWM use by default except channels 0/1 */
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tcu->pwm_channels_mask = GENMASK(soc_info->num_channels - 1, 2);
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of_property_read_u32(np, "ingenic,pwm-channels-mask",
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(u32 *)&tcu->pwm_channels_mask);
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/* Verify that we have at least two free channels */
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if (hweight8(tcu->pwm_channels_mask) > soc_info->num_channels - 2) {
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pr_crit("%s: Invalid PWM channel mask: 0x%02lx\n", __func__,
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tcu->pwm_channels_mask);
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ret = -EINVAL;
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goto err_free_ingenic_tcu;
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}
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tcu->map = map;
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ingenic_tcu = tcu;
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tcu->timer_channel = find_first_zero_bit(&tcu->pwm_channels_mask,
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soc_info->num_channels);
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tcu->cs_channel = find_next_zero_bit(&tcu->pwm_channels_mask,
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soc_info->num_channels,
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tcu->timer_channel + 1);
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ret = ingenic_tcu_clocksource_init(np, tcu);
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if (ret) {
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pr_crit("%s: Unable to init clocksource: %d\n", __func__, ret);
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goto err_free_ingenic_tcu;
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}
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ret = ingenic_tcu_timer_init(np, tcu);
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if (ret)
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goto err_tcu_clocksource_cleanup;
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/* Register the sched_clock at the end as there's no way to undo it */
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rate = clk_get_rate(tcu->cs_clk);
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sched_clock_register(ingenic_tcu_timer_read, 16, rate);
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return 0;
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err_tcu_clocksource_cleanup:
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clocksource_unregister(&tcu->cs);
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clk_disable_unprepare(tcu->cs_clk);
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clk_put(tcu->cs_clk);
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err_free_ingenic_tcu:
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kfree(tcu);
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return ret;
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}
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TIMER_OF_DECLARE(jz4740_tcu_intc, "ingenic,jz4740-tcu", ingenic_tcu_init);
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TIMER_OF_DECLARE(jz4725b_tcu_intc, "ingenic,jz4725b-tcu", ingenic_tcu_init);
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TIMER_OF_DECLARE(jz4770_tcu_intc, "ingenic,jz4770-tcu", ingenic_tcu_init);
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static int __init ingenic_tcu_probe(struct platform_device *pdev)
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{
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platform_set_drvdata(pdev, ingenic_tcu);
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return 0;
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}
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static int __maybe_unused ingenic_tcu_suspend(struct device *dev)
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{
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struct ingenic_tcu *tcu = dev_get_drvdata(dev);
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clk_disable(tcu->cs_clk);
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clk_disable(tcu->timer_clk);
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return 0;
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}
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static int __maybe_unused ingenic_tcu_resume(struct device *dev)
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{
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struct ingenic_tcu *tcu = dev_get_drvdata(dev);
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int ret;
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ret = clk_enable(tcu->timer_clk);
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if (ret)
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return ret;
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ret = clk_enable(tcu->cs_clk);
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if (ret) {
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clk_disable(tcu->timer_clk);
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return ret;
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}
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return 0;
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}
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static const struct dev_pm_ops __maybe_unused ingenic_tcu_pm_ops = {
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/* _noirq: We want the TCU clocks to be gated last / ungated first */
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.suspend_noirq = ingenic_tcu_suspend,
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.resume_noirq = ingenic_tcu_resume,
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};
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static struct platform_driver ingenic_tcu_driver = {
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.driver = {
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.name = "ingenic-tcu-timer",
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#ifdef CONFIG_PM_SLEEP
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.pm = &ingenic_tcu_pm_ops,
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#endif
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.of_match_table = ingenic_tcu_of_match,
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},
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};
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builtin_platform_driver_probe(ingenic_tcu_driver, ingenic_tcu_probe);
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