[PATCHv9 07/43] CLK: TI: add autoidle support
Tero Kristo
t-kristo at ti.com
Fri Nov 1 05:18:45 EDT 2013
On 10/31/2013 06:05 PM, Nishanth Menon wrote:
> On 10/25/2013 10:57 AM, Tero Kristo wrote:
>> TI clk driver now routes some of the basic clocks through own
>> registration routine to allow autoidle support. This routine just
>> checks a couple of device node properties and adds autoidle support
>> if required, and just passes the registration forward to basic clocks.
>>
>> Signed-off-by: Tero Kristo <t-kristo at ti.com>
>> ---
>> arch/arm/mach-omap2/clock.c | 6 +++
>> drivers/clk/ti/Makefile | 2 +-
>> drivers/clk/ti/autoidle.c | 109 +++++++++++++++++++++++++++++++++++++++++++
>> include/linux/clk/ti.h | 9 ++++
>> 4 files changed, 125 insertions(+), 1 deletion(-)
>> create mode 100644 drivers/clk/ti/autoidle.c
>>
>> diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c
>> index 0c38ca9..223f432b 100644
>> --- a/arch/arm/mach-omap2/clock.c
>> +++ b/arch/arm/mach-omap2/clock.c
>> @@ -520,6 +520,9 @@ int omap2_clk_enable_autoidle_all(void)
>> list_for_each_entry(c, &clk_hw_omap_clocks, node)
>> if (c->ops && c->ops->allow_idle)
>> c->ops->allow_idle(c);
>> +
>> + of_ti_clk_allow_autoidle_all();
>> +
>> return 0;
>> }
>>
>> @@ -539,6 +542,9 @@ int omap2_clk_disable_autoidle_all(void)
>> list_for_each_entry(c, &clk_hw_omap_clocks, node)
>> if (c->ops && c->ops->deny_idle)
>> c->ops->deny_idle(c);
>> +
>> + of_ti_clk_deny_autoidle_all();
>> +
>> return 0;
>> }
>>
>> diff --git a/drivers/clk/ti/Makefile b/drivers/clk/ti/Makefile
>> index 05af5d8..533efb4 100644
>> --- a/drivers/clk/ti/Makefile
>> +++ b/drivers/clk/ti/Makefile
>> @@ -1,3 +1,3 @@
>> ifneq ($(CONFIG_OF),)
>> -obj-y += clk.o dpll.o
>> +obj-y += clk.o dpll.o autoidle.o
>> endif
>> diff --git a/drivers/clk/ti/autoidle.c b/drivers/clk/ti/autoidle.c
>> new file mode 100644
>> index 0000000..efa2a3e
>> --- /dev/null
>> +++ b/drivers/clk/ti/autoidle.c
>> @@ -0,0 +1,109 @@
>> +/*
>> + * TI clock autoidle support
>> + *
>> + * Copyright (C) 2013 Texas Instruments, Inc.
>> + *
>> + * Tero Kristo <t-kristo at ti.com>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/clk-provider.h>
>> +#include <linux/slab.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/of_address.h>
>> +#include <linux/clk/ti.h>
>> +
>> +struct clk_ti_autoidle {
>> + u32 reg;
>> + struct regmap *regmap;
>> + u8 shift;
>> + u8 flags;
>> + const char *name;
>> + struct list_head node;
>> +};
>> +
>> +#define AUTOIDLE_LOW 0x1
>> +
>> +static LIST_HEAD(autoidle_clks);
>> +
>> +static void ti_allow_autoidle(struct clk_ti_autoidle *clk)
>> +{
>> + u32 val;
>> +
>> + regmap_read(clk->regmap, clk->reg, &val);
>> +
>> + if (clk->flags & AUTOIDLE_LOW)
>> + val &= ~(1 << clk->shift);
>> + else
>> + val |= (1 << clk->shift);
>> +
>> + regmap_write(clk->regmap, clk->reg, val);
> regmap_update_bits ?
Hmm yea that would work.
>> +}
>> +
>> +static void ti_deny_autoidle(struct clk_ti_autoidle *clk)
>> +{
>> + u32 val;
>> +
>> + regmap_read(clk->regmap, clk->reg, &val);
>> +
>> + if (clk->flags & AUTOIDLE_LOW)
>> + val |= (1 << clk->shift);
>> + else
>> + val &= ~(1 << clk->shift);
>> +
>> + regmap_write(clk->regmap, clk->reg, val);
> regmap_update_bits ?
Same.
>
> and ofcourse error handling for regmap ops..
What do you propose to do in error case? Panic, WARN() or just printk?
>
>> +}
>> +
>> +void of_ti_clk_allow_autoidle_all(void)
>> +{
>> + struct clk_ti_autoidle *c;
>> +
>> + list_for_each_entry(c, &autoidle_clks, node)
>> + ti_allow_autoidle(c);
>> +}
>> +
>> +void of_ti_clk_deny_autoidle_all(void)
>> +{
>> + struct clk_ti_autoidle *c;
>> +
>> + list_for_each_entry(c, &autoidle_clks, node)
>> + ti_deny_autoidle(c);
>> +}
>> +
>> +int __init of_ti_autoidle_setup(struct device_node *node,
>> + struct regmap *regmap)
>
> will be nice if you could kernel-doc all public functions at the very
> least.
Ok, I can try to do that for next. :P
>
>> +{
>> + u32 shift;
>> + struct clk_ti_autoidle *clk;
>> +
>> + if (of_property_read_u32(node, "ti,autoidle-shift", &shift))
>> + return 0;
>> +
>> + clk = kzalloc(sizeof(*clk), GFP_KERNEL);
>> +
>> + if (!clk) {
>> + pr_err("%s: kzalloc failed\n", __func__);
>> + return -ENOMEM;
>> + }
>> +
>> + clk->shift = shift;
>> + clk->name = node->name;
>> + of_property_read_u32(node, "reg", &clk->reg);
>
> dt binding?
> what happens if someone forgets this?
You get zero offset.
I can add a check for this though.
>
>> + clk->regmap = regmap;
>> +
>> + if (of_property_read_bool(node, "ti,invert-autoidle-bit"))
>> + clk->flags |= AUTOIDLE_LOW;
>> +
>> + list_add(&clk->node, &autoidle_clks);
>> +
>> + return 0;
>> +}
>> diff --git a/include/linux/clk/ti.h b/include/linux/clk/ti.h
>> index 7ab02fa..e45005c 100644
>> --- a/include/linux/clk/ti.h
>> +++ b/include/linux/clk/ti.h
>> @@ -178,6 +178,15 @@ int omap3_dpll4_set_rate(struct clk_hw *clk, unsigned long rate,
>>
>> void ti_dt_clocks_register(struct ti_dt_clk *oclks);
>> void ti_dt_clk_init_provider(struct device_node *np, struct regmap *regmap);
>> +int of_ti_autoidle_setup(struct device_node *node, struct regmap *regmap);
>> +
>> +#ifdef CONFIG_OF
>> +void of_ti_clk_allow_autoidle_all(void);
>> +void of_ti_clk_deny_autoidle_all(void);
>> +#else
>> +static inline void of_ti_clk_allow_autoidle_all(void) { }
>> +static inline void of_ti_clk_deny_autoidle_all(void) { }
>> +#endif
>>
>> extern const struct clk_hw_omap_ops clkhwops_omap3_dpll;
>> extern const struct clk_hw_omap_ops clkhwops_omap4_dpllmx;
>>
>
>
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