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Message-ID: <4e2c44a9-1935-2d1a-152b-04551f43b71f@nvidia.com>
Date: Wed, 13 Feb 2019 17:08:31 +0800
From: Joseph Lo <josephl@...dia.com>
To: Daniel Lezcano <daniel.lezcano@...aro.org>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Thomas Gleixner <tglx@...utronix.de>
CC: <linux-tegra@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, Thierry Reding <treding@...dia.com>
Subject: Re: [PATCH V6 2/7] clocksource: tegra: add Tegra210 timer support
On 2/13/19 4:55 PM, Daniel Lezcano wrote:
> On 08/02/2019 14:23, Joseph Lo wrote:
>> Hi Daniel & Thomas,
>>
>> Do we have the chance to get this patch merged for K5.1?
>
> Hi Jospeh,
>
> sorry for the delay, I was overbooked these past two weeks.
>
> Overall it looks ok but give me a couple of days to review the driver
> more deeply.
No problem, thanks.
>
>
>> On 2/2/19 12:16 AM, Joseph Lo wrote:
>>> 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.
>>>
>>> Also convert the original driver to use timer-of API.
>>>
>>> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
>>> Cc: Thomas Gleixner <tglx@...utronix.de>
>>> Cc: linux-kernel@...r.kernel.org
>>> Signed-off-by: Joseph Lo <josephl@...dia.com>
>>> Acked-by: Thierry Reding <treding@...dia.com>
>>> Acked-by: Jon Hunter <jonathanh@...dia.com>
>>> ---
>>> v6:
>>> * refine the timer defines
>>> * add ack tag from Jon.
>>> v5:
>>> * add ack tag from Thierry
>>> v4:
>>> * merge timer-tegra210.c in previous version into timer-tegra20.c
>>> v3:
>>> * use timer-of API
>>> v2:
>>> * add error clean-up code
>>> ---
>>> drivers/clocksource/Kconfig | 2 +-
>>> drivers/clocksource/timer-tegra20.c | 371 ++++++++++++++++++++--------
>>> include/linux/cpuhotplug.h | 1 +
>>> 3 files changed, 270 insertions(+), 104 deletions(-)
>>>
>>> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
>>> index a9e26f6a81a1..6af78534a285 100644
>>> --- a/drivers/clocksource/Kconfig
>>> +++ b/drivers/clocksource/Kconfig
>>> @@ -131,7 +131,7 @@ config SUN5I_HSTIMER
>>> config TEGRA_TIMER
>>> bool "Tegra timer driver" if COMPILE_TEST
>>> select CLKSRC_MMIO
>>> - depends on ARM
>>> + select TIMER_OF
>>> help
>>> Enables support for the Tegra driver.
>>> diff --git a/drivers/clocksource/timer-tegra20.c
>>> b/drivers/clocksource/timer-tegra20.c
>>> index 4293943f4e2b..f66edd63d7f4 100644
>>> --- a/drivers/clocksource/timer-tegra20.c
>>> +++ b/drivers/clocksource/timer-tegra20.c
>>> @@ -15,21 +15,24 @@
>>> *
>>> */
>>> -#include <linux/init.h>
>>> +#include <linux/clk.h>
>>> +#include <linux/clockchips.h>
>>> +#include <linux/cpu.h>
>>> +#include <linux/cpumask.h>
>>> +#include <linux/delay.h>
>>> #include <linux/err.h>
>>> -#include <linux/time.h>
>>> #include <linux/interrupt.h>
>>> -#include <linux/irq.h>
>>> -#include <linux/clockchips.h>
>>> -#include <linux/clocksource.h>
>>> -#include <linux/clk.h>
>>> -#include <linux/io.h>
>>> #include <linux/of_address.h>
>>> #include <linux/of_irq.h>
>>> -#include <linux/sched_clock.h>
>>> -#include <linux/delay.h>
>>> +#include <linux/percpu.h>
>>> +#include <linux/syscore_ops.h>
>>> +#include <linux/time.h>
>>> +
>>> +#include "timer-of.h"
>>> +#ifdef CONFIG_ARM
>>> #include <asm/mach/time.h>
>>> +#endif
>>> #define RTC_SECONDS 0x08
>>> #define RTC_SHADOW_SECONDS 0x0c
>>> @@ -39,74 +42,145 @@
>>> #define TIMERUS_USEC_CFG 0x14
>>> #define TIMERUS_CNTR_FREEZE 0x4c
>>> -#define TIMER1_BASE 0x0
>>> -#define TIMER2_BASE 0x8
>>> -#define TIMER3_BASE 0x50
>>> -#define TIMER4_BASE 0x58
>>> -
>>> -#define TIMER_PTV 0x0
>>> -#define TIMER_PCR 0x4
>>> -
>>> +#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)
>>> +
>>> +#ifdef CONFIG_ARM
>>> +#define TIMER_CPU0 0x50 /* TIMER3 */
>>> +#else
>>> +#define TIMER_CPU0 0x90 /* TIMER10 */
>>> +#define TIMER10_IRQ_IDX 10
>>> +#define IRQ_IDX_FOR_CPU(cpu) (TIMER10_IRQ_IDX + cpu)
>>> +#endif
>>> +#define TIMER_BASE_FOR_CPU(cpu) (TIMER_CPU0 + (cpu) * 8)
>>> +
>>> +static u32 usec_config;
>>> static void __iomem *timer_reg_base;
>>> +#ifdef CONFIG_ARM
>>> static void __iomem *rtc_base;
>>> -
>>> static struct timespec64 persistent_ts;
>>> static u64 persistent_ms, last_persistent_ms;
>>> -
>>> static struct delay_timer tegra_delay_timer;
>>> -
>>> -#define timer_writel(value, reg) \
>>> - writel_relaxed(value, timer_reg_base + (reg))
>>> -#define timer_readl(reg) \
>>> - readl_relaxed(timer_reg_base + (reg))
>>> +#endif
>>> static int tegra_timer_set_next_event(unsigned long cycles,
>>> struct clock_event_device *evt)
>>> {
>>> - u32 reg;
>>> + void __iomem *reg_base = timer_of_base(to_timer_of(evt));
>>> - reg = 0x80000000 | ((cycles > 1) ? (cycles-1) : 0);
>>> - timer_writel(reg, TIMER3_BASE + TIMER_PTV);
>>> + writel(TIMER_PTV_EN |
>>> + ((cycles > 1) ? (cycles - 1) : 0), /* n+1 scheme */
>>> + reg_base + TIMER_PTV);
>>> return 0;
>>> }
>>> -static inline void timer_shutdown(struct clock_event_device *evt)
>>> +static int tegra_timer_shutdown(struct clock_event_device *evt)
>>> {
>>> - timer_writel(0, TIMER3_BASE + TIMER_PTV);
>>> + void __iomem *reg_base = timer_of_base(to_timer_of(evt));
>>> +
>>> + writel(0, reg_base + TIMER_PTV);
>>> +
>>> + return 0;
>>> }
>>> -static int tegra_timer_shutdown(struct clock_event_device *evt)
>>> +static int tegra_timer_set_periodic(struct clock_event_device *evt)
>>> {
>>> - timer_shutdown(evt);
>>> + void __iomem *reg_base = timer_of_base(to_timer_of(evt));
>>> +
>>> + writel(TIMER_PTV_EN | TIMER_PTV_PER |
>>> + ((timer_of_rate(to_timer_of(evt)) / HZ) - 1),
>>> + reg_base + TIMER_PTV);
>>> +
>>> return 0;
>>> }
>>> -static int tegra_timer_set_periodic(struct clock_event_device *evt)
>>> +static irqreturn_t tegra_timer_isr(int irq, void *dev_id)
>>> {
>>> - u32 reg = 0xC0000000 | ((1000000 / HZ) - 1);
>>> + struct clock_event_device *evt = (struct clock_event_device
>>> *)dev_id;
>>> + void __iomem *reg_base = timer_of_base(to_timer_of(evt));
>>> +
>>> + writel(TIMER_PCR_INTR_CLR, reg_base + TIMER_PCR);
>>> + evt->event_handler(evt);
>>> +
>>> + return IRQ_HANDLED;
>>> +}
>>> +
>>> +#ifdef CONFIG_ARM64
>>> +static DEFINE_PER_CPU(struct timer_of, tegra_to) = {
>>> + .flags = TIMER_OF_CLOCK | TIMER_OF_BASE,
>>> +
>>> + .clkevt = {
>>> + .name = "tegra_timer",
>>> + .rating = 460,
>>> + .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
>>> + .set_next_event = tegra_timer_set_next_event,
>>> + .set_state_shutdown = tegra_timer_shutdown,
>>> + .set_state_periodic = tegra_timer_set_periodic,
>>> + .set_state_oneshot = tegra_timer_shutdown,
>>> + .tick_resume = tegra_timer_shutdown,
>>> + },
>>> +};
>>> +
>>> +static int tegra_timer_setup(unsigned int cpu)
>>> +{
>>> + struct timer_of *to = per_cpu_ptr(&tegra_to, cpu);
>>> +
>>> + irq_force_affinity(to->clkevt.irq, cpumask_of(cpu));
>>> + enable_irq(to->clkevt.irq);
>>> +
>>> + clockevents_config_and_register(&to->clkevt, timer_of_rate(to),
>>> + 1, /* min */
>>> + 0x1fffffff); /* 29 bits */
>>> - timer_shutdown(evt);
>>> - timer_writel(reg, TIMER3_BASE + TIMER_PTV);
>>> return 0;
>>> }
>>> -static struct clock_event_device tegra_clockevent = {
>>> - .name = "timer0",
>>> - .rating = 300,
>>> - .features = CLOCK_EVT_FEAT_ONESHOT |
>>> - CLOCK_EVT_FEAT_PERIODIC |
>>> - CLOCK_EVT_FEAT_DYNIRQ,
>>> - .set_next_event = tegra_timer_set_next_event,
>>> - .set_state_shutdown = tegra_timer_shutdown,
>>> - .set_state_periodic = tegra_timer_set_periodic,
>>> - .set_state_oneshot = tegra_timer_shutdown,
>>> - .tick_resume = tegra_timer_shutdown,
>>> +static int tegra_timer_stop(unsigned int cpu)
>>> +{
>>> + struct timer_of *to = per_cpu_ptr(&tegra_to, cpu);
>>> +
>>> + to->clkevt.set_state_shutdown(&to->clkevt);
>>> + disable_irq_nosync(to->clkevt.irq);
>>> +
>>> + return 0;
>>> +}
>>> +#else /* CONFIG_ARM */
>>> +static struct timer_of tegra_to = {
>>> + .flags = TIMER_OF_CLOCK | TIMER_OF_BASE | TIMER_OF_IRQ,
>>> +
>>> + .clkevt = {
>>> + .name = "tegra_timer",
>>> + .rating = 300,
>>> + .features = CLOCK_EVT_FEAT_ONESHOT |
>>> + CLOCK_EVT_FEAT_PERIODIC |
>>> + CLOCK_EVT_FEAT_DYNIRQ,
>>> + .set_next_event = tegra_timer_set_next_event,
>>> + .set_state_shutdown = tegra_timer_shutdown,
>>> + .set_state_periodic = tegra_timer_set_periodic,
>>> + .set_state_oneshot = tegra_timer_shutdown,
>>> + .tick_resume = tegra_timer_shutdown,
>>> + .cpumask = cpu_possible_mask,
>>> + },
>>> +
>>> + .of_irq = {
>>> + .index = 2,
>>> + .flags = IRQF_TIMER | IRQF_TRIGGER_HIGH,
>>> + .handler = tegra_timer_isr,
>>> + },
>>> };
>>> static u64 notrace tegra_read_sched_clock(void)
>>> {
>>> - return timer_readl(TIMERUS_CNTR_1US);
>>> + return readl(timer_reg_base + TIMERUS_CNTR_1US);
>>> +}
>>> +
>>> +static unsigned long tegra_delay_timer_read_counter_long(void)
>>> +{
>>> + return readl(timer_reg_base + TIMERUS_CNTR_1US);
>>> }
>>> /*
>>> @@ -143,98 +217,188 @@ static void
>>> tegra_read_persistent_clock64(struct timespec64 *ts)
>>> timespec64_add_ns(&persistent_ts, delta * NSEC_PER_MSEC);
>>> *ts = persistent_ts;
>>> }
>>> +#endif
>>> -static unsigned long tegra_delay_timer_read_counter_long(void)
>>> +static int tegra_timer_suspend(void)
>>> {
>>> - return readl(timer_reg_base + TIMERUS_CNTR_1US);
>>> +#ifdef CONFIG_ARM64
>>> + int cpu;
>>> +
>>> + for_each_possible_cpu(cpu) {
>>> + struct timer_of *to = per_cpu_ptr(&tegra_to, cpu);
>>> + void __iomem *reg_base = timer_of_base(to);
>>> +
>>> + writel(TIMER_PCR_INTR_CLR, reg_base + TIMER_PCR);
>>> + }
>>> +#else
>>> + void __iomem *reg_base = timer_of_base(&tegra_to);
>>> +
>>> + writel(TIMER_PCR_INTR_CLR, reg_base + TIMER_PCR);
>>> +#endif
>>> +
>>> + return 0;
>>> }
>>> -static irqreturn_t tegra_timer_interrupt(int irq, void *dev_id)
>>> +static void tegra_timer_resume(void)
>>> {
>>> - struct clock_event_device *evt = (struct clock_event_device
>>> *)dev_id;
>>> - timer_writel(1<<30, TIMER3_BASE + TIMER_PCR);
>>> - evt->event_handler(evt);
>>> - return IRQ_HANDLED;
>>> + writel(usec_config, timer_reg_base + TIMERUS_USEC_CFG);
>>> }
>>> -static struct irqaction tegra_timer_irq = {
>>> - .name = "timer0",
>>> - .flags = IRQF_TIMER | IRQF_TRIGGER_HIGH,
>>> - .handler = tegra_timer_interrupt,
>>> - .dev_id = &tegra_clockevent,
>>> +static struct syscore_ops tegra_timer_syscore_ops = {
>>> + .suspend = tegra_timer_suspend,
>>> + .resume = tegra_timer_resume,
>>> };
>>> -static int __init tegra20_init_timer(struct device_node *np)
>>> +static int tegra_timer_init(struct device_node *np, struct timer_of *to)
>>> {
>>> - struct clk *clk;
>>> - unsigned long rate;
>>> - int ret;
>>> + int ret = 0;
>>> - timer_reg_base = of_iomap(np, 0);
>>> - if (!timer_reg_base) {
>>> - pr_err("Can't map timer registers\n");
>>> - return -ENXIO;
>>> - }
>>> + ret = timer_of_init(np, to);
>>> + if (ret < 0)
>>> + goto out;
>>> - tegra_timer_irq.irq = irq_of_parse_and_map(np, 2);
>>> - if (tegra_timer_irq.irq <= 0) {
>>> - pr_err("Failed to map timer IRQ\n");
>>> - return -EINVAL;
>>> - }
>>> + timer_reg_base = timer_of_base(to);
>>> - clk = of_clk_get(np, 0);
>>> - if (IS_ERR(clk)) {
>>> - pr_warn("Unable to get timer clock. Assuming 12Mhz input
>>> clock.\n");
>>> - rate = 12000000;
>>> - } else {
>>> - clk_prepare_enable(clk);
>>> - rate = clk_get_rate(clk);
>>> - }
>>> -
>>> - switch (rate) {
>>> + /*
>>> + * Configure microsecond timers to have 1MHz clock
>>> + * Config register is 0xqqww, where qq is "dividend", ww is
>>> "divisor"
>>> + * Uses n+1 scheme
>>> + */
>>> + switch (timer_of_rate(to)) {
>>> case 12000000:
>>> - timer_writel(0x000b, TIMERUS_USEC_CFG);
>>> + usec_config = 0x000b; /* (11+1)/(0+1) */
>>> + break;
>>> + case 12800000:
>>> + usec_config = 0x043f; /* (63+1)/(4+1) */
>>> break;
>>> case 13000000:
>>> - timer_writel(0x000c, TIMERUS_USEC_CFG);
>>> + usec_config = 0x000c; /* (12+1)/(0+1) */
>>> + break;
>>> + case 16800000:
>>> + usec_config = 0x0453; /* (83+1)/(4+1) */
>>> break;
>>> case 19200000:
>>> - timer_writel(0x045f, TIMERUS_USEC_CFG);
>>> + usec_config = 0x045f; /* (95+1)/(4+1) */
>>> break;
>>> case 26000000:
>>> - timer_writel(0x0019, TIMERUS_USEC_CFG);
>>> + 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:
>>> - WARN(1, "Unknown clock rate");
>>> + ret = -EINVAL;
>>> + goto out;
>>> + }
>>> +
>>> + writel(usec_config, timer_of_base(to) + TIMERUS_USEC_CFG);
>>> +
>>> + register_syscore_ops(&tegra_timer_syscore_ops);
>>> +out:
>>> + return ret;
>>> +}
>>> +
>>> +#ifdef CONFIG_ARM64
>>> +static int __init tegra210_timer_init(struct device_node *np)
>>> +{
>>> + int cpu, ret = 0;
>>> + struct timer_of *to;
>>> +
>>> + to = this_cpu_ptr(&tegra_to);
>>> + ret = tegra_timer_init(np, to);
>>> + if (ret < 0)
>>> + goto out;
>>> +
>>> + for_each_possible_cpu(cpu) {
>>> + struct timer_of *cpu_to;
>>> +
>>> + cpu_to = per_cpu_ptr(&tegra_to, cpu);
>>> + cpu_to->of_base.base = timer_reg_base + TIMER_BASE_FOR_CPU(cpu);
>>> + cpu_to->of_clk.rate = timer_of_rate(to);
>>> + cpu_to->clkevt.cpumask = cpumask_of(cpu);
>>> +
>>> + cpu_to->clkevt.irq =
>>> + irq_of_parse_and_map(np, IRQ_IDX_FOR_CPU(cpu));
>>> + if (!cpu_to->clkevt.irq) {
>>> + pr_err("%s: can't map IRQ for CPU%d\n",
>>> + __func__, cpu);
>>> + ret = -EINVAL;
>>> + goto out;
>>> + }
>>> +
>>> + irq_set_status_flags(cpu_to->clkevt.irq, IRQ_NOAUTOEN);
>>> + ret = request_irq(cpu_to->clkevt.irq, tegra_timer_isr,
>>> + IRQF_TIMER | IRQF_NOBALANCING,
>>> + cpu_to->clkevt.name, &cpu_to->clkevt);
>>> + if (ret) {
>>> + pr_err("%s: cannot setup irq %d for CPU%d\n",
>>> + __func__, cpu_to->clkevt.irq, cpu);
>>> + ret = -EINVAL;
>>> + goto out_irq;
>>> + }
>>> + }
>>> +
>>> + cpuhp_setup_state(CPUHP_AP_TEGRA_TIMER_STARTING,
>>> + "AP_TEGRA_TIMER_STARTING", tegra_timer_setup,
>>> + tegra_timer_stop);
>>> +
>>> + return ret;
>>> +
>>> +out_irq:
>>> + for_each_possible_cpu(cpu) {
>>> + struct timer_of *cpu_to;
>>> +
>>> + cpu_to = per_cpu_ptr(&tegra_to, cpu);
>>> + if (cpu_to->clkevt.irq) {
>>> + free_irq(cpu_to->clkevt.irq, &cpu_to->clkevt);
>>> + irq_dispose_mapping(cpu_to->clkevt.irq);
>>> + }
>>> }
>>> +out:
>>> + timer_of_cleanup(to);
>>> + return ret;
>>> +}
>>> +TIMER_OF_DECLARE(tegra210_timer, "nvidia,tegra210-timer",
>>> tegra210_timer_init);
>>> +#else /* CONFIG_ARM */
>>> +static int __init tegra20_init_timer(struct device_node *np)
>>> +{
>>> + int ret = 0;
>>> +
>>> + ret = tegra_timer_init(np, &tegra_to);
>>> + if (ret < 0)
>>> + goto out;
>>> - sched_clock_register(tegra_read_sched_clock, 32, 1000000);
>>> + tegra_to.of_base.base = timer_reg_base + TIMER_BASE_FOR_CPU(0);
>>> + tegra_to.of_clk.rate = 1000000; /* microsecond timer */
>>> + sched_clock_register(tegra_read_sched_clock, 32,
>>> + timer_of_rate(&tegra_to));
>>> ret = clocksource_mmio_init(timer_reg_base + TIMERUS_CNTR_1US,
>>> - "timer_us", 1000000, 300, 32,
>>> - clocksource_mmio_readl_up);
>>> + "timer_us", timer_of_rate(&tegra_to),
>>> + 300, 32, clocksource_mmio_readl_up);
>>> if (ret) {
>>> pr_err("Failed to register clocksource\n");
>>> - return ret;
>>> + goto out;
>>> }
>>> tegra_delay_timer.read_current_timer =
>>> tegra_delay_timer_read_counter_long;
>>> - tegra_delay_timer.freq = 1000000;
>>> + tegra_delay_timer.freq = timer_of_rate(&tegra_to);
>>> register_current_timer_delay(&tegra_delay_timer);
>>> - ret = setup_irq(tegra_timer_irq.irq, &tegra_timer_irq);
>>> - if (ret) {
>>> - pr_err("Failed to register timer IRQ: %d\n", ret);
>>> - return ret;
>>> - }
>>> + clockevents_config_and_register(&tegra_to.clkevt,
>>> + timer_of_rate(&tegra_to),
>>> + 0x1,
>>> + 0x1fffffff);
>>> - tegra_clockevent.cpumask = cpu_possible_mask;
>>> - tegra_clockevent.irq = tegra_timer_irq.irq;
>>> - clockevents_config_and_register(&tegra_clockevent, 1000000,
>>> - 0x1, 0x1fffffff);
>>> + return ret;
>>> +out:
>>> + timer_of_cleanup(&tegra_to);
>>> - return 0;
>>> + return ret;
>>> }
>>> TIMER_OF_DECLARE(tegra20_timer, "nvidia,tegra20-timer",
>>> tegra20_init_timer);
>>> @@ -261,3 +425,4 @@ static int __init tegra20_init_rtc(struct
>>> device_node *np)
>>> return register_persistent_clock(tegra_read_persistent_clock64);
>>> }
>>> TIMER_OF_DECLARE(tegra20_rtc, "nvidia,tegra20-rtc", tegra20_init_rtc);
>>> +#endif
>>> 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,
>>>
>
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