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SubjectRe: [PATCH v3 2/2] clocksource: Ingenic: Add support for the Ingenic X1000 OST.
Hi Zhou,

Le mer. 1 juil. 2020 à 1:15, 周琰杰 (Zhou Yanjie)
<zhouyanjie@wanyeetech.com> a écrit :
> X1000 and SoCs after X1000 (such as X1500 and X1830) had a separate
> OST, it no longer belongs to TCU. This driver will register both a
> clocksource and a sched_clock to the system.
>
> Tested-by: 周正 (Zhou Zheng) <sernia.zhou@foxmail.com>
> Co-developed-by: 漆鹏振 (Qi Pengzhen) <aric.pzqi@ingenic.com>
> Signed-off-by: 漆鹏振 (Qi Pengzhen) <aric.pzqi@ingenic.com>
> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
> ---
>
> Notes:
> v1->v2:
> Fix compile warnings.
> Reported-by: kernel test robot <lkp@intel.com>
>
> v2->v3:
> No change.
>
> drivers/clocksource/Kconfig | 19 +-
> drivers/clocksource/Makefile | 1 +
> drivers/clocksource/ingenic-sysost.c | 509
> +++++++++++++++++++++++++++++++++++
> 3 files changed, 525 insertions(+), 4 deletions(-)
> create mode 100644 drivers/clocksource/ingenic-sysost.c
>
> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
> index 91418381fcd4..172397a00f3e 100644
> --- a/drivers/clocksource/Kconfig
> +++ b/drivers/clocksource/Kconfig
> @@ -686,7 +686,7 @@ config MILBEAUT_TIMER
> Enables the support for Milbeaut timer driver.
>
> config INGENIC_TIMER
> - bool "Clocksource/timer using the TCU in Ingenic JZ SoCs"
> + bool "Clocksource/timer using the TCU in Ingenic SoCs"

This cosmetic change is unrelated to the patch, please drop it.

> default MACH_INGENIC
> depends on MIPS || COMPILE_TEST
> depends on COMMON_CLK
> @@ -694,15 +694,26 @@ config INGENIC_TIMER
> select TIMER_OF
> select IRQ_DOMAIN
> help
> - Support for the timer/counter unit of the Ingenic JZ SoCs.
> + Support for the timer/counter unit of the Ingenic SoCs.

Same here.

> +
> +config INGENIC_SYSOST
> + bool "Clocksource/timer using the SYSOST in Ingenic SoCs"
> + default MACH_INGENIC
> + depends on MIPS || COMPILE_TEST
> + depends on COMMON_CLK
> + select MFD_SYSCON
> + select TIMER_OF
> + select IRQ_DOMAIN
> + help
> + This option enables support for SYSOST in Ingenic SoCs .
>
> config INGENIC_OST
> - bool "Clocksource for Ingenic OS Timer"
> + bool "Clocksource for Ingenic OST"

Same here.

> depends on MIPS || COMPILE_TEST
> depends on COMMON_CLK
> select MFD_SYSCON
> help
> - Support for the Operating System Timer of the Ingenic JZ SoCs.
> + Support for the Operating System Timer of the Ingenic SoCs.

Same here.

>
> config MICROCHIP_PIT64B
> bool "Microchip PIT64B support"
> diff --git a/drivers/clocksource/Makefile
> b/drivers/clocksource/Makefile
> index bdda1a2e4097..3994e221e262 100644
> --- a/drivers/clocksource/Makefile
> +++ b/drivers/clocksource/Makefile
> @@ -82,6 +82,7 @@ obj-$(CONFIG_H8300_TMR8) += h8300_timer8.o
> obj-$(CONFIG_H8300_TMR16) += h8300_timer16.o
> obj-$(CONFIG_H8300_TPU) += h8300_tpu.o
> obj-$(CONFIG_INGENIC_OST) += ingenic-ost.o
> +obj-$(CONFIG_INGENIC_SYSOST) += ingenic-sysost.o
> obj-$(CONFIG_INGENIC_TIMER) += ingenic-timer.o
> obj-$(CONFIG_CLKSRC_ST_LPC) += clksrc_st_lpc.o
> obj-$(CONFIG_X86_NUMACHIP) += numachip.o
> diff --git a/drivers/clocksource/ingenic-sysost.c
> b/drivers/clocksource/ingenic-sysost.c
> new file mode 100644
> index 000000000000..d3e1b7582221
> --- /dev/null
> +++ b/drivers/clocksource/ingenic-sysost.c
> @@ -0,0 +1,509 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Ingenic XBurst SoCs SYSOST clocks driver
> + * Copyright (c) 2020 周琰杰 (Zhou Yanjie)
> <zhouyanjie@wanyeetech.com>
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/clockchips.h>
> +#include <linux/clocksource.h>
> +#include <linux/interrupt.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/sched_clock.h>
> +#include <linux/slab.h>
> +#include <linux/syscore_ops.h>
> +
> +#include <dt-bindings/clock/ingenic,ost.h>
> +
> +/* OST register offsets */
> +#define OST_REG_OSTCCR 0x00
> +#define OST_REG_OSTCR 0x08
> +#define OST_REG_OSTFR 0x0c
> +#define OST_REG_OSTMR 0x10
> +#define OST_REG_OST1DFR 0x14
> +#define OST_REG_OST1CNT 0x18
> +#define OST_REG_OST2CNTL 0x20
> +#define OST_REG_OSTCNT2HBUF 0x24
> +#define OST_REG_OSTESR 0x34
> +#define OST_REG_OSTECR 0x38
> +
> +/* bits within the OSTCCR register */
> +#define OSTCCR_PRESCALE1_MASK 0x3
> +#define OSTCCR_PRESCALE2_MASK 0xc
> +#define OSTCCR_PRESCALE1_LSB 0
> +#define OSTCCR_PRESCALE2_LSB 2
> +
> +/* bits within the OSTCR register */
> +#define OSTCR_OST1CLR BIT(0)
> +#define OSTCR_OST2CLR BIT(1)
> +
> +/* bits within the OSTFR register */
> +#define OSTFR_FFLAG BIT(0)
> +
> +/* bits within the OSTMR register */
> +#define OSTMR_FMASK BIT(0)
> +
> +/* bits within the OSTESR register */
> +#define OSTESR_OST1ENS BIT(0)
> +#define OSTESR_OST2ENS BIT(1)
> +
> +/* bits within the OSTECR register */
> +#define OSTECR_OST1ENC BIT(0)
> +#define OSTECR_OST2ENC BIT(1)
> +
> +enum ost_clk_parent {
> + OST_PARENT_EXT,
> +};
> +
> +struct ingenic_soc_info {
> + unsigned int num_channels;
> +};

Unless you plan to add support for other SoCs which have more than 2
channels, I think you can drop this - just add a OST_NUM_CHANNELS macro.

> +
> +struct ingenic_ost_clk_info {
> + struct clk_init_data init_data;
> + u8 ostccr_reg;
> +};
> +
> +struct ingenic_ost_clk {
> + struct clk_hw hw;
> + unsigned int idx;
> + struct ingenic_ost *ost;
> + const struct ingenic_ost_clk_info *info;
> +};
> +
> +struct ingenic_ost {
> + void __iomem *base;
> + const struct ingenic_soc_info *soc_info;
> + struct clk *clk, *percpu_timer_clk, *global_timer_clk;
> + unsigned int percpu_timer_channel, global_timer_channel;
> + struct clock_event_device cevt;
> + struct clocksource cs;
> + char name[20];
> +
> + struct clk_hw_onecell_data *clocks;
> +};
> +
> +static struct ingenic_ost *ingenic_ost;
> +
> +static inline struct ingenic_ost_clk *to_ost_clk(struct clk_hw *hw)
> +{
> + return container_of(hw, struct ingenic_ost_clk, hw);
> +}
> +
> +static unsigned long ingenic_ost_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + struct ingenic_ost_clk *ost_clk = to_ost_clk(hw);
> + const struct ingenic_ost_clk_info *info = ost_clk->info;
> + unsigned int prescale;
> +
> + prescale = readl(ost_clk->ost->base + info->ostccr_reg);
> +
> + if (ost_clk->idx == OST_CLK_PERCPU_TIMER)
> + prescale = (prescale & OSTCCR_PRESCALE1_MASK) >>
> OSTCCR_PRESCALE1_LSB;
> + else if (ost_clk->idx == OST_CLK_GLOBAL_TIMER)
> + prescale = (prescale & OSTCCR_PRESCALE2_MASK) >>
> OSTCCR_PRESCALE2_LSB;

Instead of checking which clock you're manipulating here, just set a
different .recalc_rate to the two clocks.

> +
> + return parent_rate >> (prescale * 2);
> +}
> +
> +static u8 ingenic_ost_get_prescale(unsigned long rate, unsigned long
> req_rate)
> +{
> + u8 prescale;
> +
> + for (prescale = 0; prescale < 2; prescale++)
> + if ((rate >> (prescale * 2)) <= req_rate)
> + return prescale;
> +
> + return 2; /* /16 divider */
> +}
> +
> +static long ingenic_ost_round_rate(struct clk_hw *hw, unsigned long
> req_rate,
> + unsigned long *parent_rate)
> +{
> + unsigned long rate = *parent_rate;
> + u8 prescale;
> +
> + if (req_rate > rate)
> + return rate;
> +
> + prescale = ingenic_ost_get_prescale(rate, req_rate);
> +
> + return rate >> (prescale * 2);
> +}
> +
> +static int ingenic_ost_set_rate(struct clk_hw *hw, unsigned long
> req_rate,
> + unsigned long parent_rate)
> +{
> + struct ingenic_ost_clk *ost_clk = to_ost_clk(hw);
> + const struct ingenic_ost_clk_info *info = ost_clk->info;
> + u8 prescale = ingenic_ost_get_prescale(parent_rate, req_rate);
> + int val;
> +
> + if (ost_clk->idx == OST_CLK_PERCPU_TIMER) {
> + val = readl(ost_clk->ost->base + info->ostccr_reg);
> + val = (val & ~OSTCCR_PRESCALE1_MASK) | (prescale <<
> OSTCCR_PRESCALE1_LSB);
> + writel(val, ost_clk->ost->base + info->ostccr_reg);
> + } else if (ost_clk->idx == OST_CLK_GLOBAL_TIMER) {
> + 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);
> + }

Same here - set a different .set_rate() callback to the two clocks.

> +
> + return 0;
> +}
> +
> +static const struct clk_ops ingenic_ost_clk_ops = {
> + .recalc_rate = ingenic_ost_recalc_rate,
> + .round_rate = ingenic_ost_round_rate,
> + .set_rate = ingenic_ost_set_rate,
> +};
> +
> +static const char * const ingenic_ost_clk_parents[] = {
> + [OST_PARENT_EXT] = "ext",
> +};

just { "ext" } will be fine, no need to specify the index, which is
zero anyway. Then you can drop the ost_clock_parent enum.

> +
> +#define DEF_TIMER(_name, _ostccr) { \
> + .init_data = { \
> + .name = _name, \
> + .parent_names = ingenic_ost_clk_parents, \
> + .num_parents = ARRAY_SIZE(ingenic_ost_clk_parents), \
> + .ops = &ingenic_ost_clk_ops, \
> + .flags = CLK_SET_RATE_UNGATE, \
> + }, \
> + .ostccr_reg = _ostccr, \
> +}
> +
> +static const struct ingenic_ost_clk_info ingenic_ost_clk_info[] = {
> + [OST_CLK_PERCPU_TIMER] = DEF_TIMER("percpu timer", OST_REG_OSTCCR),
> + [OST_CLK_GLOBAL_TIMER] = DEF_TIMER("global timer", OST_REG_OSTCCR),
> +};
> +
> +#undef DEF_TIMER
> +
> +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);
> +
> + return count;
> +}
> +
> +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)
> +{
> + return container_of(evt, struct ingenic_ost, cevt);
> +}
> +
> +static int ingenic_ost_cevt_set_state_shutdown(struct
> clock_event_device *evt)
> +{
> + struct ingenic_ost *ost = to_ingenic_ost(evt);
> +
> + writel(OSTECR_OST1ENC, ost->base + OST_REG_OSTECR);
> +
> + return 0;
> +}
> +
> +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);
> +
> + 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);
> +
> + writel(OSTECR_OST1ENC, ost->base + OST_REG_OSTECR);
> +
> + if (evt->event_handler)
> + evt->event_handler(evt);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int __init ingenic_ost_register_clock(struct ingenic_ost *ost,
> + unsigned int idx, const struct ingenic_ost_clk_info *info,
> + struct clk_hw_onecell_data *clocks)
> +{
> + struct ingenic_ost_clk *ost_clk;
> + int val, err;
> +
> + ost_clk = kzalloc(sizeof(*ost_clk), GFP_KERNEL);
> + if (!ost_clk)
> + return -ENOMEM;
> +
> + ost_clk->hw.init = &info->init_data;
> + ost_clk->idx = idx;
> + ost_clk->info = info;
> + 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);
> +
> + err = clk_hw_register(NULL, &ost_clk->hw);
> + if (err) {
> + kfree(ost_clk);
> + return err;
> + }
> +
> + clocks->hws[idx] = &ost_clk->hw;
> +
> + return 0;
> +}
> +
> +static struct clk * __init ingenic_ost_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_ost_percpu_timer_init(struct device_node
> *np,
> + struct ingenic_ost *ost)
> +{
> + unsigned int timer_virq, channel = ost->percpu_timer_channel;
> + 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);
> +
> + err = clk_prepare_enable(ost->percpu_timer_clk);
> + if (err)
> + goto err_clk_put;
> +
> + rate = clk_get_rate(ost->percpu_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(ost->name, sizeof(ost->name), "OST percpu timer");
> +
> + err = request_irq(timer_virq, ingenic_ost_cevt_cb, IRQF_TIMER,
> + ost->name, &ost->cevt);
> + if (err)
> + goto err_irq_dispose_mapping;
> +
> + 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(&ost->cevt, rate, 4, 0xffffffff);
> +
> + return 0;
> +
> +err_irq_dispose_mapping:
> + irq_dispose_mapping(timer_virq);
> +err_clk_disable:
> + clk_disable_unprepare(ost->percpu_timer_clk);
> +err_clk_put:
> + clk_put(ost->percpu_timer_clk);
> + return err;
> +}
> +
> +static int __init ingenic_ost_global_timer_init(struct device_node
> *np,
> + struct ingenic_ost *ost)
> +{
> + unsigned int channel = ost->global_timer_channel;
> + struct clocksource *cs = &ost->cs;
> + unsigned long rate;
> + int err;
> +
> + ost->global_timer_clk = ingenic_ost_get_clock(np, channel);
> + if (IS_ERR(ost->global_timer_clk))
> + return PTR_ERR(ost->global_timer_clk);
> +
> + err = clk_prepare_enable(ost->global_timer_clk);
> + if (err)
> + goto err_clk_put;
> +
> + rate = clk_get_rate(ost->global_timer_clk);
> + if (!rate) {
> + err = -EINVAL;
> + 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);
> +
> + cs->name = "ingenic-ost";
> + cs->rating = 400;
> + cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
> + cs->mask = CLOCKSOURCE_MASK(32);
> + cs->read = ingenic_ost_clocksource_read;
> +
> + err = clocksource_register_hz(cs, rate);
> + if (err)
> + goto err_clk_disable;
> +
> + return 0;
> +
> +err_clk_disable:
> + clk_disable_unprepare(ost->global_timer_clk);
> +err_clk_put:
> + clk_put(ost->global_timer_clk);
> + return err;
> +}
> +
> +static const struct ingenic_soc_info x1000_soc_info = {
> + .num_channels = 2,
> +};
> +
> +static const struct of_device_id __maybe_unused
> ingenic_ost_of_match[] __initconst = {
> + { .compatible = "ingenic,x1000-ost", .data = &x1000_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_match,
> np);
> + struct ingenic_ost *ost;
> + unsigned int i;
> + int ret;
> +
> + ost = kzalloc(sizeof(*ost), GFP_KERNEL);
> + if (!ost)
> + return -ENOMEM;
> +
> + ost->base = of_iomap(np, 0);
> + if (IS_ERR(ost->base)) {
> + pr_err("%s: Failed to map OST registers\n", __func__);
> + ret = PTR_ERR(ost->base);
> + goto err_free_ost;
> + }
> +
> + 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 = clk_prepare_enable(ost->clk);
> + if (ret) {
> + pr_crit("%s: Unable to enable OST clock\n", __func__);
> + 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) {
> + ret = -ENOMEM;
> + goto err_clk_disable;
> + }
> +
> + ost->clocks->num = ost->soc_info->num_channels;
> +
> + for (i = 0; i < ost->clocks->num; i++) {
> + ret = ingenic_ost_register_clock(ost, i, &ingenic_ost_clk_info[i],
> ost->clocks);
> + if (ret) {
> + pr_crit("%s: Cannot register clock %d\n", __func__, i);
> + goto err_unregister_ost_clocks;
> + }
> + }
> +
> + ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get,
> ost->clocks);
> + if (ret) {
> + pr_crit("%s: Cannot add OF clock provider\n", __func__);
> + goto err_unregister_ost_clocks;
> + }
> +
> + ost->percpu_timer_channel = OST_CLK_PERCPU_TIMER;
> + ost->global_timer_channel = OST_CLK_GLOBAL_TIMER;

If that's a constant, just use the constant where
'ost->percpu_timer_channel' and 'ost->global_timer_channel' are used, I
think.

> +
> + ingenic_ost = ost;
> +
> + return 0;
> +
> +err_unregister_ost_clocks:
> + for (i = 0; i < ost->clocks->num; i++)
> + if (ost->clocks->hws[i])
> + clk_hw_unregister(ost->clocks->hws[i]);
> + kfree(ost->clocks);
> +err_clk_disable:
> + clk_disable_unprepare(ost->clk);
> +err_put_clk:
> + clk_put(ost->clk);
> +err_free_ost:
> + kfree(ost);
> + return ret;
> +}
> +
> +static int __init ingenic_ost_init(struct device_node *np)
> +{
> + unsigned long rate;
> + int ret = ingenic_ost_probe(np);

Don't call functions in variable declarations - they can be overlooked
easily.

> +
> + if (ret)
> + pr_crit("%s: Failed to initialize OST clocks: %d\n", __func__,
> ret);

return ret?

> +
> + of_node_clear_flag(np, OF_POPULATED);
> +
> + ret = ingenic_ost_global_timer_init(np, ingenic_ost);

The 'ingenic_ost' variable is just a dirty workaround for the
sched_clock callback, which does not take any parameter. Avoid using it
here. Make ingenic_ost_probe() return a pointer to your ingenic_ost
instance (and a PTR_ERR() on error), and use that pointer for the rest.

Cheers,
-Paul

> + if (ret) {
> + pr_crit("%s: Unable to init global timer: %x\n", __func__, ret);
> + goto err_free_ingenic_ost;
> + }
> +
> + ret = ingenic_ost_percpu_timer_init(np, ingenic_ost);
> + if (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(ingenic_ost->global_timer_clk);
> + sched_clock_register(ingenic_ost_global_timer_read_cntl, 32, rate);
> +
> + return 0;
> +
> +err_ost_global_timer_cleanup:
> + clocksource_unregister(&ingenic_ost->cs);
> + clk_disable_unprepare(ingenic_ost->global_timer_clk);
> + clk_put(ingenic_ost->global_timer_clk);
> +err_free_ingenic_ost:
> + kfree(ingenic_ost);
> + return ret;
> +}
> +
> +TIMER_OF_DECLARE(x1000_ost, "ingenic,x1000-ost", ingenic_ost_init);
> --
> 2.11.0
>


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