Signed-off-by: Peng Fan peng.fan@nxp.com ---
V2: Rebase to master
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 2ed9ed6ab8..822e09b084 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" @@ -86,8 +87,95 @@ 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) ? + dev_get_clk_ptr(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,