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Sun, 06 Jan 2019 19:28:19 -0800 From: Joseph Lo To: Thierry Reding , Jonathan Hunter Subject: [PATCH 2/6] clocksource: tegra: add Tegra210 timer driver Date: Mon, 7 Jan 2019 11:28:06 +0800 Message-ID: <20190107032810.13522-3-josephl@nvidia.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190107032810.13522-1-josephl@nvidia.com> References: <20190107032810.13522-1-josephl@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1546831684; bh=s8IY+h9IkiprqLgYA1ZLKIoVj6hPmRxlGX95RnCfMwo=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:X-NVConfidentiality: Content-Transfer-Encoding:Content-Type; b=oBSETjQwAtSvWPL4jZQiQnPOSBAqbh3Uz+qTYENJjEhtyR5tGe91EFt1Ll65nBQJt KztDyryjXKbz7PADmMzV00JQ2G7SVmRRw5ZwfxyzQbsFNyS05eGLa5CrmZX2a1jF+0 DWi3CW7D1dNQSEOt2ct2spjiG1/QhNvNjyz5Ud6n479AOe4HLjh4Cg2SNOM3XkFCsq xmA4u06uGcZkQORL6PIpp4TjYZEyBMSM6M/X1dZmp3xtT2H8vhetTSzr5oc6+DaE1F irxXfzHiYA7rAI+9oEqBWATpnMTausip4cq0n2S1bVxJU42s65TVLq3Ts4fOsecD+K kxTlxKMBxkveA== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190106_192822_719819_127FA2D5 X-CRM114-Status: GOOD ( 16.11 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Lezcano , linux-kernel@vger.kernel.org, Joseph Lo , linux-tegra@vger.kernel.org, Thomas Gleixner , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add support for the Tegra210 timer that runs at oscillator clock (TMR10-TMR13). We need these timers to work as clock event device and to replace the ARMv8 architected timer due to it can't survive across the power cycle of the CPU core or CPUPORESET signal. So it can't be a wake-up source when CPU suspends in power down state. Based on the work of Antti P Miettinen Cc: Daniel Lezcano Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Signed-off-by: Joseph Lo --- drivers/clocksource/Kconfig | 3 + drivers/clocksource/Makefile | 1 + drivers/clocksource/timer-tegra210.c | 240 +++++++++++++++++++++++++++ include/linux/cpuhotplug.h | 1 + 4 files changed, 245 insertions(+) create mode 100644 drivers/clocksource/timer-tegra210.c diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index a9e26f6a81a1..e6e3e64b6320 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -135,6 +135,9 @@ config TEGRA_TIMER help Enables support for the Tegra driver. +config TEGRA210_TIMER + def_bool ARCH_TEGRA_210_SOC + config VT8500_TIMER bool "VT8500 timer driver" if COMPILE_TEST depends on HAS_IOMEM diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index cdd210ff89ea..95de59c8a47b 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_SUN4I_TIMER) += timer-sun4i.o obj-$(CONFIG_SUN5I_HSTIMER) += timer-sun5i.o obj-$(CONFIG_MESON6_TIMER) += timer-meson6.o obj-$(CONFIG_TEGRA_TIMER) += timer-tegra20.o +obj-$(CONFIG_TEGRA210_TIMER) += timer-tegra210.o obj-$(CONFIG_VT8500_TIMER) += timer-vt8500.o obj-$(CONFIG_NSPIRE_TIMER) += timer-zevio.o obj-$(CONFIG_BCM_KONA_TIMER) += bcm_kona_timer.o diff --git a/drivers/clocksource/timer-tegra210.c b/drivers/clocksource/timer-tegra210.c new file mode 100644 index 000000000000..d88c127d3b3b --- /dev/null +++ b/drivers/clocksource/timer-tegra210.c @@ -0,0 +1,240 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2014-2019, NVIDIA CORPORATION. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static u32 tegra210_timer_freq; +static void __iomem *tegra210_timer_reg_base; +static u32 usec_config; + +#define TIMER_PTV 0x0 +#define TIMER_PTV_EN BIT(31) +#define TIMER_PTV_PER BIT(30) +#define TIMER_PCR 0x4 +#define TIMER_PCR_INTR_CLR BIT(30) +#define TIMERUS_CNTR_1US 0x10 +#define TIMERUS_USEC_CFG 0x14 + +#define TIMER10_OFFSET 0x90 + +#define TIMER_FOR_CPU(cpu) (TIMER10_OFFSET + (cpu) * 8) + +struct tegra210_clockevent { + struct clock_event_device evt; + char name[20]; + void __iomem *reg_base; +}; +#define to_tegra_cevt(p) (container_of(p, struct tegra210_clockevent, evt)) + +static struct tegra210_clockevent __percpu *tegra210_evt; + +static int tegra210_timer_set_next_event(unsigned long cycles, + struct clock_event_device *evt) +{ + struct tegra210_clockevent *tevt; + + tevt = to_tegra_cevt(evt); + writel(TIMER_PTV_EN | + ((cycles > 1) ? (cycles - 1) : 0), /* n+1 scheme */ + tevt->reg_base + TIMER_PTV); + + return 0; +} + +static inline void timer_shutdown(struct tegra210_clockevent *tevt) +{ + writel(0, tevt->reg_base + TIMER_PTV); +} + +static int tegra210_timer_shutdown(struct clock_event_device *evt) +{ + struct tegra210_clockevent *tevt; + + tevt = to_tegra_cevt(evt); + timer_shutdown(tevt); + + return 0; +} + +static int tegra210_timer_set_periodic(struct clock_event_device *evt) +{ + struct tegra210_clockevent *tevt; + + tevt = to_tegra_cevt(evt); + writel(TIMER_PTV_EN | TIMER_PTV_PER | ((tegra210_timer_freq / HZ) - 1), + tevt->reg_base + TIMER_PTV); + + return 0; +} + +static irqreturn_t tegra210_timer_isr(int irq, void *dev_id) +{ + struct tegra210_clockevent *tevt; + + tevt = dev_id; + writel(TIMER_PCR_INTR_CLR, tevt->reg_base + TIMER_PCR); + tevt->evt.event_handler(&tevt->evt); + + return IRQ_HANDLED; +} + +static int tegra210_timer_setup(unsigned int cpu) +{ + struct tegra210_clockevent *tevt = per_cpu_ptr(tegra210_evt, cpu); + + irq_force_affinity(tevt->evt.irq, cpumask_of(cpu)); + enable_irq(tevt->evt.irq); + + clockevents_config_and_register(&tevt->evt, tegra210_timer_freq, + 1, /* min */ + 0x1fffffff); /* 29 bits */ + + return 0; +} + +static int tegra210_timer_stop(unsigned int cpu) +{ + struct tegra210_clockevent *tevt = per_cpu_ptr(tegra210_evt, cpu); + + tevt->evt.set_state_shutdown(&tevt->evt); + disable_irq_nosync(tevt->evt.irq); + + return 0; +} + +static int tegra_timer_suspend(void) +{ + int cpu; + + for_each_possible_cpu(cpu) { + void __iomem *reg_base = tegra210_timer_reg_base + + TIMER_FOR_CPU(cpu); + writel(TIMER_PCR_INTR_CLR, reg_base + TIMER_PCR); + } + + return 0; +} + +static void tegra_timer_resume(void) +{ + writel(usec_config, tegra210_timer_reg_base + TIMERUS_USEC_CFG); +} + +static struct syscore_ops tegra_timer_syscore_ops = { + .suspend = tegra_timer_suspend, + .resume = tegra_timer_resume, +}; + +static int __init tegra210_timer_init(struct device_node *np) +{ + int cpu, ret; + struct tegra210_clockevent *tevt; + struct clk *clk; + + tegra210_evt = alloc_percpu(struct tegra210_clockevent); + if (!tegra210_evt) + return -ENOMEM; + + tegra210_timer_reg_base = of_iomap(np, 0); + if (!tegra210_timer_reg_base) + return -ENXIO; + + clk = of_clk_get(np, 0); + if (IS_ERR(clk)) + return -EINVAL; + + clk_prepare_enable(clk); + tegra210_timer_freq = clk_get_rate(clk); + + for_each_possible_cpu(cpu) { + tevt = per_cpu_ptr(tegra210_evt, cpu); + tevt->reg_base = tegra210_timer_reg_base + TIMER_FOR_CPU(cpu); + tevt->evt.irq = irq_of_parse_and_map(np, cpu); + if (!tevt->evt.irq) { + pr_err("%s: can't map IRQ for CPU%d\n", + __func__, cpu); + return -EINVAL; + } + + snprintf(tevt->name, ARRAY_SIZE(tevt->name), + "tegra210_timer%d", cpu); + tevt->evt.name = tevt->name; + tevt->evt.cpumask = cpumask_of(cpu); + tevt->evt.set_next_event = tegra210_timer_set_next_event; + tevt->evt.set_state_shutdown = tegra210_timer_shutdown; + tevt->evt.set_state_periodic = tegra210_timer_set_periodic; + tevt->evt.set_state_oneshot = tegra210_timer_shutdown; + tevt->evt.tick_resume = tegra210_timer_shutdown; + tevt->evt.features = CLOCK_EVT_FEAT_PERIODIC | + CLOCK_EVT_FEAT_ONESHOT; + tevt->evt.rating = 460; + + irq_set_status_flags(tevt->evt.irq, IRQ_NOAUTOEN); + ret = request_irq(tevt->evt.irq, tegra210_timer_isr, + IRQF_TIMER | IRQF_NOBALANCING, + tevt->name, tevt); + if (ret) { + pr_err("%s: cannot setup irq %d for CPU%d\n", + __func__, tevt->evt.irq, cpu); + return -EINVAL; + } + } + + /* + * Configure microsecond timers to have 1MHz clock + * Config register is 0xqqww, where qq is "dividend", ww is "divisor" + * Uses n+1 scheme + */ + switch (tegra210_timer_freq) { + case 12000000: + usec_config = 0x000b; /* (11+1)/(0+1) */ + break; + case 12800000: + usec_config = 0x043f; /* (63+1)/(4+1) */ + break; + case 13000000: + usec_config = 0x000c; /* (12+1)/(0+1) */ + break; + case 16800000: + usec_config = 0x0453; /* (83+1)/(4+1) */ + break; + case 19200000: + usec_config = 0x045f; /* (95+1)/(4+1) */ + break; + case 26000000: + usec_config = 0x0019; /* (25+1)/(0+1) */ + break; + case 38400000: + usec_config = 0x04bf; /* (191+1)/(4+1) */ + break; + case 48000000: + usec_config = 0x002f; /* (47+1)/(0+1) */ + break; + default: + return -EINVAL; + } + + writel(usec_config, tegra210_timer_reg_base + TIMERUS_USEC_CFG); + + cpuhp_setup_state(CPUHP_AP_TEGRA_TIMER_STARTING, + "AP_TEGRA_TIMER_STARTING", tegra210_timer_setup, + tegra210_timer_stop); + + register_syscore_ops(&tegra_timer_syscore_ops); + + return 0; +} + +TIMER_OF_DECLARE(tegra210_timer, "nvidia,tegra210-timer", tegra210_timer_init); diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index fd586d0301e7..e78281d07b70 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -121,6 +121,7 @@ enum cpuhp_state { CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING, CPUHP_AP_ARM_TWD_STARTING, CPUHP_AP_QCOM_TIMER_STARTING, + CPUHP_AP_TEGRA_TIMER_STARTING, CPUHP_AP_ARMADA_TIMER_STARTING, CPUHP_AP_MARCO_TIMER_STARTING, CPUHP_AP_MIPS_GIC_TIMER_STARTING,