diff options
| author | Haojian Zhuang <haojian.zhuang@linaro.org> | 2013-06-08 22:47:19 +0800 |
|---|---|---|
| committer | Mike Turquette <mturquette@linaro.org> | 2013-06-15 20:23:53 -0700 |
| commit | 045779942c04646a222289989e6a5b617dfdedf7 (patch) | |
| tree | e66048660ffc624543a0a36e526ce685e8d3e132 /drivers/clk/clk-gate.c | |
| parent | d57dfe7508af2b528e26d84792edec1e7d919682 (diff) | |
| download | linux-045779942c04646a222289989e6a5b617dfdedf7.tar.bz2 | |
clk: gate: add CLK_GATE_HIWORD_MASK
In Rockchip Cortex-A9 based chips, they don't use paradigm of
reading-changing-writing the register contents. Instead they
use a hiword mask to indicate the changed bits.
When b1 should be set as gate, it also needs to indicate the change
by setting hiword mask (b1 << 16).
The patch adds gate 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-gate.c')
| -rw-r--r-- | drivers/clk/clk-gate.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c index 15114febfd92..790306e921c8 100644 --- a/drivers/clk/clk-gate.c +++ b/drivers/clk/clk-gate.c @@ -53,12 +53,18 @@ static void clk_gate_endisable(struct clk_hw *hw, int enable) if (gate->lock) spin_lock_irqsave(gate->lock, flags); - reg = readl(gate->reg); - - if (set) - reg |= BIT(gate->bit_idx); - else - reg &= ~BIT(gate->bit_idx); + if (gate->flags & CLK_GATE_HIWORD_MASK) { + reg = BIT(gate->bit_idx + 16); + if (set) + reg |= BIT(gate->bit_idx); + } else { + reg = readl(gate->reg); + + if (set) + reg |= BIT(gate->bit_idx); + else + reg &= ~BIT(gate->bit_idx); + } writel(reg, gate->reg); @@ -121,6 +127,13 @@ struct clk *clk_register_gate(struct device *dev, const char *name, struct clk *clk; struct clk_init_data init; + if (clk_gate_flags & CLK_GATE_HIWORD_MASK) { + if (bit_idx > 16) { + pr_err("gate bit exceeds LOWORD field\n"); + return ERR_PTR(-EINVAL); + } + } + /* allocate the gate */ gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL); if (!gate) { |