diff options
| author | Haojian Zhuang <haojian.zhuang@linaro.org> | 2013-06-08 22:47:18 +0800 |
|---|---|---|
| committer | Mike Turquette <mturquette@linaro.org> | 2013-06-15 20:23:49 -0700 |
| commit | d57dfe7508af2b528e26d84792edec1e7d919682 (patch) | |
| tree | f3be7ce2e20cdf9fad2528b4a1972e29df20a662 /drivers/clk/clk-divider.c | |
| parent | ba492e900704ba00d43c7af9d94b00da4df52587 (diff) | |
clk: divider: add CLK_DIVIDER_HIWORD_MASK flag
In both Hisilicon & Rockchip Cortex-A9 based chips, they don't use the
paradigm of reading-changing-writing the register contents.
Instead they use a hiword mask to indicate the changed bits.
When b01 should be set as setting divider, it also needs to indicate
the change by setting hiword mask (b11 << 16).
The patch adds divider flag for this usage.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers/clk/clk-divider.c')
| -rw-r--r-- | drivers/clk/clk-divider.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c index 6024e60e49aa..6d55eb2cb959 100644 --- a/drivers/clk/clk-divider.c +++ b/drivers/clk/clk-divider.c @@ -227,8 +227,12 @@ static int clk_divider_set_rate(struct clk_hw *hw, unsigned long rate, if (divider->lock) spin_lock_irqsave(divider->lock, flags); - val = readl(divider->reg); - val &= ~(div_mask(divider) << divider->shift); + if (divider->flags & CLK_DIVIDER_HIWORD_MASK) { + val = div_mask(divider) << (divider->shift + 16); + } else { + val = readl(divider->reg); + val &= ~(div_mask(divider) << divider->shift); + } val |= value << divider->shift; writel(val, divider->reg); @@ -255,6 +259,13 @@ static struct clk *_register_divider(struct device *dev, const char *name, struct clk *clk; struct clk_init_data init; + if (clk_divider_flags & CLK_DIVIDER_HIWORD_MASK) { + if (width + shift > 16) { + pr_warn("divider value exceeds LOWORD field\n"); + return ERR_PTR(-EINVAL); + } + } + /* allocate the divider */ div = kzalloc(sizeof(struct clk_divider), GFP_KERNEL); if (!div) { |