Message-ID: <28c290db-d382-ac96-62c9-cf38fd367714@wanyeetech.com>
Date:   Fri, 11 Jun 2021 23:31:57 +0800
From:   Zhou Yanjie <zhouyu@...yeetech.com>
To:     Paul Cercueil <paul@...pouillou.net>,
        周琰杰 <zhouyanjie@...yeetech.com>
Cc:     daniel.lezcano@...aro.org, tglx@...utronix.de,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        dongsheng.qiu@...enic.com, aric.pzqi@...enic.com,
        rick.tyliu@...enic.com, sihui.liu@...enic.com,
        jun.jiang@...enic.com, sernia.zhou@...mail.com
Subject: Re: [PATCH v2 2/2] clocksource: Ingenic: Add SMP/SMT support for
 sysost driver.

Hi Paul,

On 2021/6/10 下午11:30, Paul Cercueil wrote:
> Hi Zhou,
>
> Le sam., juin 5 2021 at 00:31:46 +0800, 周琰杰 (Zhou Yanjie) 
> <zhouyanjie@...yeetech.com> a écrit :
>> The OST in Ingenic XBurst®2 SoCs such as X2000 and X2100, has a global
>> timer and two or four percpu timers, add support for the percpu timers.
>>
>> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
>> ---
>>
>> Notes:
>>     v1->v2:
>>     1.Fix bug in ingenic_ost_global_timer_recalc_rate().
>>     2.Add a backpointer to the ingenic_ost structure.
>>     3.Remove unnecessary spinlock.
>>     4.Use "ret = ost->irq" instead "ret = -EINVAL".
>>     5.Use "%d" instead "%x" in pr_crit().
>
> I can't shake the feeling that you are doing way too many things in 
> one single commit.
>
> From what I can see, this commit can be split in 4 patches:
>
> - Fix the "%x" in pr_crit(),
> - Add the global timer support to the X1000,
> - Add "ingenic_ost_timer" and update the code to use it,
> - Finally add X2000 support.
>
>

Sure.


>
>>  drivers/clocksource/ingenic-sysost.c | 315 
>> ++++++++++++++++++++++++++---------
>>  1 file changed, 236 insertions(+), 79 deletions(-)
>>
>> diff --git a/drivers/clocksource/ingenic-sysost.c 
>> b/drivers/clocksource/ingenic-sysost.c
>> index a129840..6f080e4 100644
>> --- a/drivers/clocksource/ingenic-sysost.c
>> +++ b/drivers/clocksource/ingenic-sysost.c
>> @@ -4,6 +4,7 @@
>>   * Copyright (c) 2020 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
>>   */
>>
>> +#include <linux/bitfield.h>
>>  #include <linux/bitops.h>
>>  #include <linux/clk.h>
>>  #include <linux/clk-provider.h>
>> @@ -13,6 +14,8 @@
>>  #include <linux/mfd/syscon.h>
>>  #include <linux/of_address.h>
>>  #include <linux/of_irq.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/overflow.h>
>>  #include <linux/sched_clock.h>
>>  #include <linux/slab.h>
>>  #include <linux/syscore_ops.h>
>> @@ -21,10 +24,14 @@
>>
>>  /* OST register offsets */
>>  #define OST_REG_OSTCCR            0x00
>> +#define OST_REG_OSTER            0x04
>>  #define OST_REG_OSTCR            0x08
>>  #define OST_REG_OSTFR            0x0c
>> +#define OST_REG_OSTCNTH            0x0c
>>  #define OST_REG_OSTMR            0x10
>> +#define OST_REG_OSTCNTL            0x10
>>  #define OST_REG_OST1DFR            0x14
>> +#define OST_REG_OSTCNTB            0x14
>>  #define OST_REG_OST1CNT            0x18
>>  #define OST_REG_OST2CNTL        0x20
>>  #define OST_REG_OSTCNT2HBUF        0x24
>> @@ -55,13 +62,23 @@
>>  #define OSTECR_OST1ENC            BIT(0)
>>  #define OSTECR_OST2ENC            BIT(1)
>>
>> +enum ingenic_ost_version {
>> +    ID_X1000,
>> +    ID_X2000,
>> +};
>> +
>>  struct ingenic_soc_info {
>> +    enum ingenic_ost_version version;
>> +    const struct ingenic_ost_clk_info *clk_info;
>> +
>>      unsigned int num_channels;
>> +    unsigned int base_offset;
>>  };
>>
>>  struct ingenic_ost_clk_info {
>>      struct clk_init_data init_data;
>> -    u8 ostccr_reg;
>> +    unsigned int idx;
>> +    u32 ostcntl_reg;
>>  };
>>
>>  struct ingenic_ost_clk {
>> @@ -71,15 +88,27 @@ struct ingenic_ost_clk {
>>      const struct ingenic_ost_clk_info *info;
>>  };
>>
>> +struct ingenic_ost_timer {
>> +    void __iomem *base;
>> +    unsigned int cpu;
>> +    unsigned int channel;
>> +    struct clock_event_device cevt;
>> +    struct ingenic_ost *ost;
>> +    struct clk *clk;
>> +    char name[20];
>> +};
>> +
>>  struct ingenic_ost {
>>      void __iomem *base;
>>      const struct ingenic_soc_info *soc_info;
>> -    struct clk *clk, *percpu_timer_clk, *global_timer_clk;
>> -    struct clock_event_device cevt;
>> +    struct clk *clk, *global_timer_clk;
>> +    struct device_node *np;
>>      struct clocksource cs;
>> -    char name[20];
>>
>>      struct clk_hw_onecell_data *clocks;
>> +    struct ingenic_ost_timer __percpu *timers;
>> +
>> +    int irq;
>>  };
>>
>>  static struct ingenic_ost *ingenic_ost;
>> @@ -94,11 +123,12 @@ static unsigned long 
>> ingenic_ost_percpu_timer_recalc_rate(struct clk_hw *hw,
>>  {
>>      struct ingenic_ost_clk *ost_clk = to_ost_clk(hw);
>>      const struct ingenic_ost_clk_info *info = ost_clk->info;
>> +    struct ingenic_ost_timer *timer = 
>> per_cpu_ptr(ost_clk->ost->timers, info->idx);
>>      unsigned int prescale;
>>
>> -    prescale = readl(ost_clk->ost->base + info->ostccr_reg);
>> +    prescale = readl(timer->base + OST_REG_OSTCCR);
>>
>> -    prescale = (prescale & OSTCCR_PRESCALE1_MASK) >> 
>> OSTCCR_PRESCALE1_LSB;
>> +    prescale = FIELD_GET(OSTCCR_PRESCALE1_MASK, prescale);
>>
>>      return parent_rate >> (prescale * 2);
>>  }
>> @@ -108,11 +138,15 @@ static unsigned long 
>> ingenic_ost_global_timer_recalc_rate(struct clk_hw *hw,
>>  {
>>      struct ingenic_ost_clk *ost_clk = to_ost_clk(hw);
>>      const struct ingenic_ost_clk_info *info = ost_clk->info;
>> +    struct ingenic_ost_timer *timer = 
>> per_cpu_ptr(ost_clk->ost->timers, info->idx);
>>      unsigned int prescale;
>>
>> -    prescale = readl(ost_clk->ost->base + info->ostccr_reg);
>> +    prescale = readl(timer->base + OST_REG_OSTCCR);
>>
>> -    prescale = (prescale & OSTCCR_PRESCALE2_MASK) >> 
>> OSTCCR_PRESCALE2_LSB;
>> +    if (ost_clk->ost->soc_info->version >= ID_X2000)
>> +        prescale = FIELD_GET(OSTCCR_PRESCALE1_MASK, prescale);
>> +    else
>> +        prescale = FIELD_GET(OSTCCR_PRESCALE2_MASK, prescale);
>>
>>      return parent_rate >> (prescale * 2);
>>  }
>> @@ -147,12 +181,13 @@ static int 
>> ingenic_ost_percpu_timer_set_rate(struct clk_hw *hw, unsigned long re
>>  {
>>      struct ingenic_ost_clk *ost_clk = to_ost_clk(hw);
>>      const struct ingenic_ost_clk_info *info = ost_clk->info;
>> +    struct ingenic_ost_timer *timer = 
>> per_cpu_ptr(ost_clk->ost->timers, info->idx);
>>      u8 prescale = ingenic_ost_get_prescale(parent_rate, req_rate);
>>      int val;
>>
>> -    val = readl(ost_clk->ost->base + info->ostccr_reg);
>> +    val = readl(timer->base + OST_REG_OSTCCR);
>>      val = (val & ~OSTCCR_PRESCALE1_MASK) | (prescale << 
>> OSTCCR_PRESCALE1_LSB);
>> -    writel(val, ost_clk->ost->base + info->ostccr_reg);
>> +    writel(val, timer->base + OST_REG_OSTCCR);
>>
>>      return 0;
>>  }
>> @@ -162,12 +197,18 @@ static int 
>> ingenic_ost_global_timer_set_rate(struct clk_hw *hw, unsigned long re
>>  {
>>      struct ingenic_ost_clk *ost_clk = to_ost_clk(hw);
>>      const struct ingenic_ost_clk_info *info = ost_clk->info;
>> +    struct ingenic_ost_timer *timer = 
>> per_cpu_ptr(ost_clk->ost->timers, info->idx);
>>      u8 prescale = ingenic_ost_get_prescale(parent_rate, req_rate);
>>      int val;
>>
>> -    val = readl(ost_clk->ost->base + info->ostccr_reg);
>> -    val = (val & ~OSTCCR_PRESCALE2_MASK) | (prescale << 
>> OSTCCR_PRESCALE2_LSB);
>> -    writel(val, ost_clk->ost->base + info->ostccr_reg);
>> +    val = readl(timer->base + OST_REG_OSTCCR);
>> +
>> +    if (ost_clk->ost->soc_info->version >= ID_X2000)
>> +        val = (val & ~OSTCCR_PRESCALE1_MASK) | (prescale << 
>> OSTCCR_PRESCALE1_LSB);
>> +    else
>> +        val = (val & ~OSTCCR_PRESCALE2_MASK) | (prescale << 
>> OSTCCR_PRESCALE2_LSB);
>> +
>> +    writel(val, timer->base + OST_REG_OSTCCR);
>>
>>      return 0;
>>  }
>> @@ -195,7 +236,42 @@ static const struct ingenic_ost_clk_info 
>> x1000_ost_clk_info[] = {
>>              .ops = &ingenic_ost_percpu_timer_ops,
>>              .flags = CLK_SET_RATE_UNGATE,
>>          },
>> -        .ostccr_reg = OST_REG_OSTCCR,
>> +        .idx = 0,
>> +    },
>> +
>> +    [OST_CLK_GLOBAL_TIMER] = {
>> +        .init_data = {
>> +            .name = "global timer",
>> +            .parent_names = ingenic_ost_clk_parents,
>> +            .num_parents = ARRAY_SIZE(ingenic_ost_clk_parents),
>> +            .ops = &ingenic_ost_global_timer_ops,
>> +            .flags = CLK_SET_RATE_UNGATE,
>> +        },
>> +        .ostcntl_reg = OST_REG_OST2CNTL,
>> +    },
>> +};
>> +
>> +static const struct ingenic_ost_clk_info x2000_ost_clk_info[] = {
>> +    [OST_CLK_PERCPU_TIMER0] = {
>> +        .init_data = {
>> +            .name = "percpu timer0",
>> +            .parent_names = ingenic_ost_clk_parents,
>> +            .num_parents = ARRAY_SIZE(ingenic_ost_clk_parents),
>> +            .ops = &ingenic_ost_percpu_timer_ops,
>> +            .flags = CLK_SET_RATE_UNGATE,
>> +        },
>> +        .idx = 0,
>> +    },
>> +
>> +    [OST_CLK_PERCPU_TIMER1] = {
>> +        .init_data = {
>> +            .name = "percpu timer1",
>> +            .parent_names = ingenic_ost_clk_parents,
>> +            .num_parents = ARRAY_SIZE(ingenic_ost_clk_parents),
>> +            .ops = &ingenic_ost_percpu_timer_ops,
>> +            .flags = CLK_SET_RATE_UNGATE,
>> +        },
>> +        .idx = 1,
>>      },
>>
>>      [OST_CLK_GLOBAL_TIMER] = {
>> @@ -206,7 +282,7 @@ static const struct ingenic_ost_clk_info 
>> x1000_ost_clk_info[] = {
>>              .ops = &ingenic_ost_global_timer_ops,
>>              .flags = CLK_SET_RATE_UNGATE,
>>          },
>> -        .ostccr_reg = OST_REG_OSTCCR,
>> +        .ostcntl_reg = OST_REG_OSTCNTL,
>>      },
>>  };
>>
>> @@ -215,7 +291,7 @@ static u64 notrace 
>> ingenic_ost_global_timer_read_cntl(void)
>>      struct ingenic_ost *ost = ingenic_ost;
>>      unsigned int count;
>>
>> -    count = readl(ost->base + OST_REG_OST2CNTL);
>> +    count = readl(ost->base + ost->soc_info->clk_info->ostcntl_reg);
>>
>>      return count;
>>  }
>> @@ -225,16 +301,21 @@ static u64 notrace 
>> ingenic_ost_clocksource_read(struct clocksource *cs)
>>      return ingenic_ost_global_timer_read_cntl();
>>  }
>>
>> -static inline struct ingenic_ost *to_ingenic_ost(struct 
>> clock_event_device *evt)
>> +static inline struct ingenic_ost_timer *
>> +to_ingenic_ost_timer(struct clock_event_device *evt)
>>  {
>> -    return container_of(evt, struct ingenic_ost, cevt);
>> +    return container_of(evt, struct ingenic_ost_timer, cevt);
>>  }
>>
>>  static int ingenic_ost_cevt_set_state_shutdown(struct 
>> clock_event_device *evt)
>>  {
>> -    struct ingenic_ost *ost = to_ingenic_ost(evt);
>> +    struct ingenic_ost_timer *timer = to_ingenic_ost_timer(evt);
>> +    struct ingenic_ost *ost = timer->ost;
>>
>> -    writel(OSTECR_OST1ENC, ost->base + OST_REG_OSTECR);
>> +    if (ost->soc_info->version >= ID_X2000)
>> +        writel(0, timer->base + OST_REG_OSTER);
>> +    else
>> +        writel(OSTECR_OST1ENC, timer->base + OST_REG_OSTECR);
>>
>>      return 0;
>>  }
>> @@ -242,26 +323,34 @@ static int 
>> ingenic_ost_cevt_set_state_shutdown(struct clock_event_device *evt)
>>  static int ingenic_ost_cevt_set_next(unsigned long next,
>>                       struct clock_event_device *evt)
>>  {
>> -    struct ingenic_ost *ost = to_ingenic_ost(evt);
>> -
>> -    writel((u32)~OSTFR_FFLAG, ost->base + OST_REG_OSTFR);
>> -    writel(next, ost->base + OST_REG_OST1DFR);
>> -    writel(OSTCR_OST1CLR, ost->base + OST_REG_OSTCR);
>> -    writel(OSTESR_OST1ENS, ost->base + OST_REG_OSTESR);
>> -    writel((u32)~OSTMR_FMASK, ost->base + OST_REG_OSTMR);
>> +    struct ingenic_ost_timer *timer = to_ingenic_ost_timer(evt);
>> +    struct ingenic_ost *ost = timer->ost;
>> +
>> +    writel((u32)~OSTFR_FFLAG, timer->base + OST_REG_OSTFR);
>> +    writel(next, timer->base + OST_REG_OST1DFR);
>> +    writel(OSTCR_OST1CLR, timer->base + OST_REG_OSTCR);
>> +
>> +    if (ost->soc_info->version >= ID_X2000) {
>> +        writel(OSTESR_OST1ENS, timer->base + OST_REG_OSTER);
>> +    } else {
>> +        writel(OSTESR_OST1ENS, timer->base + OST_REG_OSTESR);
>> +        writel((u32)~OSTMR_FMASK, timer->base + OST_REG_OSTMR);
>> +    }
>>
>>      return 0;
>>  }
>>
>>  static irqreturn_t ingenic_ost_cevt_cb(int irq, void *dev_id)
>>  {
>> -    struct clock_event_device *evt = dev_id;
>> -    struct ingenic_ost *ost = to_ingenic_ost(evt);
>> +    struct ingenic_ost_timer *timer = dev_id;
>> +    struct ingenic_ost *ost = timer->ost;
>>
>> -    writel(OSTECR_OST1ENC, ost->base + OST_REG_OSTECR);
>> +    if (ost->soc_info->version >= ID_X2000)
>> +        writel(0, timer->base + OST_REG_OSTER);
>> +    else
>> +        writel(OSTECR_OST1ENC, timer->base + OST_REG_OSTECR);
>>
>> -    if (evt->event_handler)
>> -        evt->event_handler(evt);
>> +    timer->cevt.event_handler(&timer->cevt);
>>
>>      return IRQ_HANDLED;
>>  }
>> @@ -271,6 +360,7 @@ static int __init 
>> ingenic_ost_register_clock(struct ingenic_ost *ost,
>>              struct clk_hw_onecell_data *clocks)
>>  {
>>      struct ingenic_ost_clk *ost_clk;
>> +    struct ingenic_ost_timer *timer = per_cpu_ptr(ost->timers, 
>> info->idx);
>>      int val, err;
>>
>>      ost_clk = kzalloc(sizeof(*ost_clk), GFP_KERNEL);
>> @@ -283,9 +373,9 @@ static int __init 
>> ingenic_ost_register_clock(struct ingenic_ost *ost,
>>      ost_clk->ost = ost;
>>
>>      /* Reset clock divider */
>> -    val = readl(ost->base + info->ostccr_reg);
>> -    val &= ~(OSTCCR_PRESCALE1_MASK | OSTCCR_PRESCALE2_MASK);
>> -    writel(val, ost->base + info->ostccr_reg);
>> +    val = readl(timer->base + OST_REG_OSTCCR);
>> +    val &= ~(OSTCCR_PRESCALE1_MASK);
>> +    writel(val, timer->base + OST_REG_OSTCCR);
>>
>>      err = clk_hw_register(NULL, &ost_clk->hw);
>>      if (err) {
>> @@ -309,57 +399,51 @@ static struct clk * __init 
>> ingenic_ost_get_clock(struct device_node *np, int id)
>>      return of_clk_get_from_provider(&args);
>>  }
>>
>> -static int __init ingenic_ost_percpu_timer_init(struct device_node *np,
>> -                     struct ingenic_ost *ost)
>> +static int __init ingenic_ost_setup_cevt(unsigned int cpu)
>>  {
>> -    unsigned int timer_virq, channel = OST_CLK_PERCPU_TIMER;
>> +    struct ingenic_ost *ost = ingenic_ost;
>> +    struct ingenic_ost_timer *timer = this_cpu_ptr(ost->timers);
>>      unsigned long rate;
>>      int err;
>>
>> -    ost->percpu_timer_clk = ingenic_ost_get_clock(np, channel);
>> -    if (IS_ERR(ost->percpu_timer_clk))
>> -        return PTR_ERR(ost->percpu_timer_clk);
>> +    timer->clk = ingenic_ost_get_clock(ost->np, timer->channel);
>> +    if (IS_ERR(timer->clk))
>> +        return PTR_ERR(timer->clk);
>>
>> -    err = clk_prepare_enable(ost->percpu_timer_clk);
>> +    err = clk_prepare_enable(timer->clk);
>>      if (err)
>>          goto err_clk_put;
>>
>> -    rate = clk_get_rate(ost->percpu_timer_clk);
>> +    rate = clk_get_rate(timer->clk);
>>      if (!rate) {
>>          err = -EINVAL;
>>          goto err_clk_disable;
>>      }
>>
>> -    timer_virq = of_irq_get(np, 0);
>> -    if (!timer_virq) {
>> -        err = -EINVAL;
>> -        goto err_clk_disable;
>> -    }
>> +    snprintf(timer->name, sizeof(timer->name), "OST percpu timer%u", 
>> cpu);
>>
>> -    snprintf(ost->name, sizeof(ost->name), "OST percpu timer");
>> +    /* Unmask full comparison match interrupt */
>> +    writel((u32)~OSTMR_FMASK, timer->base + OST_REG_OSTMR);
>>
>> -    err = request_irq(timer_virq, ingenic_ost_cevt_cb, IRQF_TIMER,
>> -              ost->name, &ost->cevt);
>> -    if (err)
>> -        goto err_irq_dispose_mapping;
>> +    timer->cpu = smp_processor_id();
>> +    timer->cevt.cpumask = cpumask_of(smp_processor_id());
>> +    timer->cevt.features = CLOCK_EVT_FEAT_ONESHOT;
>> +    timer->cevt.name = timer->name;
>> +    timer->cevt.rating = 400;
>> +    timer->cevt.set_state_shutdown = 
>> ingenic_ost_cevt_set_state_shutdown;
>> +    timer->cevt.set_next_event = ingenic_ost_cevt_set_next;
>>
>> -    ost->cevt.cpumask = cpumask_of(smp_processor_id());
>> -    ost->cevt.features = CLOCK_EVT_FEAT_ONESHOT;
>> -    ost->cevt.name = ost->name;
>> -    ost->cevt.rating = 400;
>> -    ost->cevt.set_state_shutdown = ingenic_ost_cevt_set_state_shutdown;
>> -    ost->cevt.set_next_event = ingenic_ost_cevt_set_next;
>> +    clockevents_config_and_register(&timer->cevt, rate, 4, 0xffffffff);
>>
>> -    clockevents_config_and_register(&ost->cevt, rate, 4, 0xffffffff);
>> +    if (ost->soc_info->version >= ID_X2000)
>> +        enable_percpu_irq(ost->irq, IRQ_TYPE_NONE);
>>
>>      return 0;
>>
>> -err_irq_dispose_mapping:
>> -    irq_dispose_mapping(timer_virq);
>>  err_clk_disable:
>> -    clk_disable_unprepare(ost->percpu_timer_clk);
>> +    clk_disable_unprepare(timer->clk);
>>  err_clk_put:
>> -    clk_put(ost->percpu_timer_clk);
>> +    clk_put(timer->clk);
>>      return err;
>>  }
>>
>> @@ -385,11 +469,14 @@ static int __init 
>> ingenic_ost_global_timer_init(struct device_node *np,
>>          goto err_clk_disable;
>>      }
>>
>> -    /* Clear counter CNT registers */
>> -    writel(OSTCR_OST2CLR, ost->base + OST_REG_OSTCR);
>> -
>> -    /* Enable OST channel */
>> -    writel(OSTESR_OST2ENS, ost->base + OST_REG_OSTESR);
>> +    /* Clear counter CNT registers and enable OST channel */
>> +    if (ost->soc_info->version >= ID_X2000) {
>> +        writel(OSTCR_OST1CLR, ost->base + OST_REG_OSTCR);
>> +        writel(OSTESR_OST1ENS, ost->base + OST_REG_OSTER);
>> +    } else {
>> +        writel(OSTCR_OST2CLR, ost->base + OST_REG_OSTCR);
>> +        writel(OSTESR_OST2ENS, ost->base + OST_REG_OSTESR);
>> +    }
>>
>>      cs->name = "ingenic-ost";
>>      cs->rating = 400;
>> @@ -411,18 +498,33 @@ static int __init 
>> ingenic_ost_global_timer_init(struct device_node *np,
>>  }
>>
>>  static const struct ingenic_soc_info x1000_soc_info = {
>> +    .version = ID_X1000,
>> +    .clk_info = x1000_ost_clk_info,
>> +
>>      .num_channels = 2,
>>  };
>>
>> +static const struct ingenic_soc_info x2000_soc_info = {
>> +    .version = ID_X2000,
>> +    .clk_info = x2000_ost_clk_info,
>> +
>> +    .num_channels = 3,
>> +    .base_offset = 0x100,
>> +};
>> +
>>  static const struct of_device_id __maybe_unused 
>> ingenic_ost_of_matches[] __initconst = {
>>      { .compatible = "ingenic,x1000-ost", .data = &x1000_soc_info },
>> +    { .compatible = "ingenic,x2000-ost", .data = &x2000_soc_info },
>>      { /* sentinel */ }
>>  };
>>
>>  static int __init ingenic_ost_probe(struct device_node *np)
>>  {
>>      const struct of_device_id *id = 
>> of_match_node(ingenic_ost_of_matches, np);
>> +    struct ingenic_ost_timer *timer;
>>      struct ingenic_ost *ost;
>> +    void __iomem *base;
>> +    unsigned int cpu;
>>      unsigned int i;
>>      int ret;
>>
>> @@ -430,18 +532,43 @@ static int __init ingenic_ost_probe(struct 
>> device_node *np)
>>      if (!ost)
>>          return -ENOMEM;
>>
>> +    ost->timers = alloc_percpu(struct ingenic_ost_timer);
>> +    if (!ost->timers) {
>> +        ret = -ENOMEM;
>> +        goto err_free_ost;
>> +    }
>> +
>> +    ost->np = np;
>> +    ost->soc_info = id->data;
>> +
>>      ost->base = of_io_request_and_map(np, 0, of_node_full_name(np));
>>      if (IS_ERR(ost->base)) {
>>          pr_err("%s: Failed to map OST registers\n", __func__);
>>          ret = PTR_ERR(ost->base);
>> -        goto err_free_ost;
>> +        goto err_free_timers;
>> +    }
>> +
>> +    if (ost->soc_info->version >= ID_X2000) {
>> +        base = of_io_request_and_map(np, 1, of_node_full_name(np));
>> +        if (IS_ERR(base)) {
>> +            pr_err("%s: Failed to map OST registers\n", __func__);
>> +            ret = PTR_ERR(base);
>> +            goto err_free_timers;
>> +        }
>> +    }
>
> The DT documentation only mentions one memory resource. Here, you map 
> a second one, which is not used anywhere. I'm really confused about 
> what you're trying to do here.
>

X2000 and X2100 divide the OST into two parts. The global timer is
the first part, which is still located at the address of 0x12000000,
and the percpu timers are the second part, the starting address is
0x12100000, and each timer is offset by 0x100 (percpu timer0 is at
0x12100000, percpu timer1 is at 0x12100100, percpu timer2 is at
0x12100200, percpu timer3 is at 0x12100300). This one is used in
line 593 of the code.

>> +
>> +    ost->irq = irq_of_parse_and_map(np, 0);
>> +    if (ost->irq < 0) {
>> +        pr_crit("%s: Cannot to get OST IRQ\n", __func__);
>> +        ret = ost->irq;
>> +        goto err_free_timers;
>>      }
>>
>>      ost->clk = of_clk_get_by_name(np, "ost");
>>      if (IS_ERR(ost->clk)) {
>> -        ret = PTR_ERR(ost->clk);
>>          pr_crit("%s: Cannot get OST clock\n", __func__);
>> -        goto err_free_ost;
>> +        ret = PTR_ERR(ost->clk);
>> +        goto err_free_timers;
>>      }
>>
>>      ret = clk_prepare_enable(ost->clk);
>> @@ -450,8 +577,6 @@ static int __init ingenic_ost_probe(struct 
>> device_node *np)
>>          goto err_put_clk;
>>      }
>>
>> -    ost->soc_info = id->data;
>> -
>>      ost->clocks = kzalloc(struct_size(ost->clocks, hws, 
>> ost->soc_info->num_channels),
>>                    GFP_KERNEL);
>>      if (!ost->clocks) {
>> @@ -461,8 +586,21 @@ static int __init ingenic_ost_probe(struct 
>> device_node *np)
>>
>>      ost->clocks->num = ost->soc_info->num_channels;
>>
>> -    for (i = 0; i < ost->clocks->num; i++) {
>> -        ret = ingenic_ost_register_clock(ost, i, 
>> &x1000_ost_clk_info[i], ost->clocks);
>> +    for (cpu = 0; cpu < num_possible_cpus(); cpu++) {
>> +        timer = per_cpu_ptr(ost->timers, cpu);
>> +
>> +        if (ost->soc_info->version >= ID_X2000)
>> +            timer->base = base + ost->soc_info->base_offset * cpu;
>> +        else
>> +            timer->base = ost->base;
>> +
>> +        timer->ost = ost;
>> +        timer->cpu = cpu;
>> +        timer->channel = OST_CLK_PERCPU_TIMER + cpu;
>> +    }
>> +
>> +    for (i = 0; i < num_possible_cpus() + 1; i++) {
>> +        ret = ingenic_ost_register_clock(ost, i, 
>> &ost->soc_info->clk_info[i], ost->clocks);
>>          if (ret) {
>>              pr_crit("%s: Cannot register clock %d\n", __func__, i);
>>              goto err_unregister_ost_clocks;
>> @@ -488,6 +626,8 @@ static int __init ingenic_ost_probe(struct 
>> device_node *np)
>>      clk_disable_unprepare(ost->clk);
>>  err_put_clk:
>>      clk_put(ost->clk);
>> +err_free_timers:
>> +    free_percpu(ost->timers);
>>  err_free_ost:
>>      kfree(ost);
>>      return ret;
>> @@ -513,13 +653,29 @@ static int __init ingenic_ost_init(struct 
>> device_node *np)
>>
>>      ret = ingenic_ost_global_timer_init(np, ost);
>>      if (ret) {
>> -        pr_crit("%s: Unable to init global timer: %x\n", __func__, 
>> ret);
>> +        pr_crit("%s: Unable to init global timer: %d\n", __func__, 
>> ret);
>
> This is a fix, so it needs to be a separate commit with a Fixes: tag.


Sure.


Thanks and best regards!


>
> Cheers,
> -Paul
>
>>          goto err_free_ingenic_ost;
>>      }
>>
>> -    ret = ingenic_ost_percpu_timer_init(np, ost);
>> -    if (ret)
>> +    if (ost->soc_info->version >= ID_X2000)
>> +        ret = request_percpu_irq(ost->irq, ingenic_ost_cevt_cb,
>> +                  "OST percpu timer", ost->timers);
>> +    else
>> +        ret = request_irq(ost->irq, ingenic_ost_cevt_cb, IRQF_TIMER,
>> +                  "OST percpu timer", ost->timers);
>> +
>> +    if (ret) {
>> +        pr_crit("%s: Unable to request percpu IRQ: %d\n", __func__, 
>> ret);
>> +        goto err_ost_global_timer_cleanup;
>> +    }
>> +
>> +    /* Setup clock events on each CPU core */
>> +    ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "Ingenic XBurst: 
>> online",
>> +                ingenic_ost_setup_cevt, NULL);
>> +    if (ret < 0) {
>> +        pr_crit("%s: Unable to init percpu timers: %d\n", __func__, 
>> ret);
>>          goto err_ost_global_timer_cleanup;
>> +    }
>>
>>      /* Register the sched_clock at the end as there's no way to undo 
>> it */
>>      rate = clk_get_rate(ost->global_timer_clk);
>> @@ -537,3 +693,4 @@ static int __init ingenic_ost_init(struct 
>> device_node *np)
>>  }
>>
>>  TIMER_OF_DECLARE(x1000_ost,  "ingenic,x1000-ost", ingenic_ost_init);
>> +TIMER_OF_DECLARE(x2000_ost,  "ingenic,x2000-ost", ingenic_ost_init);
>> -- 
>> 2.7.4
>>
>

Powered by blists - more mailing lists