[U-Boot] [i.MX8MM+CCF 10/41] divider set rate supporrt

Lukasz Majewski
2019-05-06T22:08:28Z

On Tue, 30 Apr 2019 10:18:05 +0000
Peng Fan <peng.fan@nxp.com> wrote:

Please state the exact SHA1 or tag when porting the code from Linux
kernel.

> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
> drivers/clk/clk-divider.c | 88
> +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 88
> insertions(+)
>
> diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
> index 2f09e0bb58..8615f9815d 100644
> --- a/drivers/clk/clk-divider.c
> +++ b/drivers/clk/clk-divider.c
> @@ -18,6 +18,7 @@
> #include <dm/lists.h>
> #include <dm/device-internal.h>
> #include <linux/clk-provider.h>
> +#include <linux/log2.h>
> #include <div64.h>
> #include <clk.h>
> #include "clk.h"
> @@ -81,8 +82,95 @@ static ulong clk_divider_recalc_rate(struct clk
> *clk) divider->flags, divider->width);
> }
>
> +static bool _is_valid_table_div(const struct clk_div_table *table,
> + unsigned int div)
> +{
> + const struct clk_div_table *clkt;
> +
> + for (clkt = table; clkt->div; clkt++)
> + if (clkt->div == div)
> + return true;
> + return false;
> +}
> +
> +static bool _is_valid_div(const struct clk_div_table *table,
> unsigned int div,
> + unsigned long flags)
> +{
> + if (flags & CLK_DIVIDER_POWER_OF_TWO)
> + return is_power_of_2(div);
> + if (table)
> + return _is_valid_table_div(table, div);
> + return true;
> +}
> +
> +static unsigned int _get_table_val(const struct clk_div_table *table,
> + unsigned int div)
> +{
> + const struct clk_div_table *clkt;
> +
> + for (clkt = table; clkt->div; clkt++)
> + if (clkt->div == div)
> + return clkt->val;
> + return 0;
> +}
> +
> +static unsigned int _get_val(const struct clk_div_table *table,
> + unsigned int div, unsigned long flags,
> u8 width) +{
> + if (flags & CLK_DIVIDER_ONE_BASED)
> + return div;
> + if (flags & CLK_DIVIDER_POWER_OF_TWO)
> + return __ffs(div);
> + if (flags & CLK_DIVIDER_MAX_AT_ZERO)
> + return (div == clk_div_mask(width) + 1) ? 0 : div;
> + if (table)
> + return _get_table_val(table, div);
> + return div - 1;
> +}
> +int divider_get_val(unsigned long rate, unsigned long parent_rate,
> + const struct clk_div_table *table, u8 width,
> + unsigned long flags)
> +{
> + unsigned int div, value;
> +
> + div = DIV_ROUND_UP_ULL((u64)parent_rate, rate);
> +
> + if (!_is_valid_div(table, div, flags))
> + return -EINVAL;
> +
> + value = _get_val(table, div, flags, width);
> +
> + return min_t(unsigned int, value, clk_div_mask(width));
> +}
> +
> +static ulong clk_divider_set_rate(struct clk *clk, unsigned long
> rate) +{
> + struct clk_divider *divider =
> to_clk_divider(clk_dev_binded(clk) ?
> + (struct clk
> *)dev_get_driver_data(clk->dev) : clk);
> + unsigned long parent_rate = clk_get_parent_rate(clk);
> + int value;
> + u32 val;
> +
> + value = divider_get_val(rate, parent_rate, divider->table,
> + divider->width, divider->flags);
> + if (value < 0)
> + return value;
> +
> + if (divider->flags & CLK_DIVIDER_HIWORD_MASK) {
> + val = clk_div_mask(divider->width) <<
> (divider->shift + 16);
> + } else {
> + val = readl(divider->reg);
> + val &= ~(clk_div_mask(divider->width) <<
> divider->shift);
> + }
> + val |= (u32)value << divider->shift;
> + writel(val, divider->reg);
> +
> + return clk_get_rate(clk);
> +}
> +
> const struct clk_ops clk_divider_ops = {
> .get_rate = clk_divider_recalc_rate,
> + .set_rate = clk_divider_set_rate,
> };
>
> static struct clk *_register_divider(struct device *dev, const char
> *name,

Best regards,

Lukasz Majewski

--

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