From afe76c8fd030dd6b75fa69f7af7b7eb1e212f248 Mon Sep 17 00:00:00 2001 From: Jim Quinlan Date: Fri, 15 May 2015 15:45:47 -0400 Subject: clk: allow a clk divider with max divisor when zero This commit allows certain Broadcom STB clock dividers to be used with clk-divider.c. It allows for a clock whose field value is the equal to the divisor, execpt when the field value is zero, in which case the divisor is 2^width. For example, consider a divisor clock with a two bit field: value divisor 0 4 1 1 2 2 3 3 Signed-off-by: Jim Quinlan Signed-off-by: Michael Turquette --- drivers/clk/clk-divider.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) (limited to 'drivers/clk/clk-divider.c') diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c index 706b578..2cab88b 100644 --- a/drivers/clk/clk-divider.c +++ b/drivers/clk/clk-divider.c @@ -78,12 +78,14 @@ static unsigned int _get_table_div(const struct clk_div_table *table, } static unsigned int _get_div(const struct clk_div_table *table, - unsigned int val, unsigned long flags) + unsigned int val, unsigned long flags, u8 width) { if (flags & CLK_DIVIDER_ONE_BASED) return val; if (flags & CLK_DIVIDER_POWER_OF_TWO) return 1 << val; + if (flags & CLK_DIVIDER_MAX_AT_ZERO) + return val ? val : div_mask(width) + 1; if (table) return _get_table_div(table, val); return val + 1; @@ -101,12 +103,14 @@ static unsigned int _get_table_val(const struct clk_div_table *table, } static unsigned int _get_val(const struct clk_div_table *table, - unsigned int div, unsigned long flags) + 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 == div_mask(width) + 1) ? 0 : div; if (table) return _get_table_val(table, div); return div - 1; @@ -117,9 +121,10 @@ unsigned long divider_recalc_rate(struct clk_hw *hw, unsigned long parent_rate, const struct clk_div_table *table, unsigned long flags) { + struct clk_divider *divider = to_clk_divider(hw); unsigned int div; - div = _get_div(table, val, flags); + div = _get_div(table, val, flags, divider->width); if (!div) { WARN(!(flags & CLK_DIVIDER_ALLOW_ZERO), "%s: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set\n", @@ -351,7 +356,8 @@ static long clk_divider_round_rate(struct clk_hw *hw, unsigned long rate, if (divider->flags & CLK_DIVIDER_READ_ONLY) { bestdiv = readl(divider->reg) >> divider->shift; bestdiv &= div_mask(divider->width); - bestdiv = _get_div(divider->table, bestdiv, divider->flags); + bestdiv = _get_div(divider->table, bestdiv, divider->flags, + divider->width); return DIV_ROUND_UP(*prate, bestdiv); } @@ -370,7 +376,7 @@ int divider_get_val(unsigned long rate, unsigned long parent_rate, if (!_is_valid_div(table, div, flags)) return -EINVAL; - value = _get_val(table, div, flags); + value = _get_val(table, div, flags, width); return min_t(unsigned int, value, div_mask(width)); } -- cgit v1.1