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clk: ti: add support for register read-modify-write low-level operation

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Useful for changing few bits on a register, this makes sure for example
that the operation is done atomically in case of syscon.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
This commit is contained in:
Tero Kristo 2017-07-26 16:47:27 +03:00
parent be02637f6b
commit 4902c2025b
2 changed files with 26 additions and 0 deletions
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24
drivers/clk/ti/clk.c
View File

@ -55,6 +55,29 @@ static void clk_memmap_writel(u32 val, const struct clk_omap_reg *reg)
writel_relaxed(val, io->mem + reg->offset);
}
static void _clk_rmw(u32 val, u32 mask, void __iomem *ptr)
{
u32 v;
v = readl_relaxed(ptr);
v &= ~mask;
v |= val;
writel_relaxed(v, ptr);
}
static void clk_memmap_rmw(u32 val, u32 mask, const struct clk_omap_reg *reg)
{
struct clk_iomap *io = clk_memmaps[reg->index];
if (reg->ptr) {
_clk_rmw(val, mask, reg->ptr);
} else if (io->regmap) {
regmap_update_bits(io->regmap, reg->offset, mask, val);
} else {
_clk_rmw(val, mask, io->mem + reg->offset);
}
}
static u32 clk_memmap_readl(const struct clk_omap_reg *reg)
{
u32 val;
@ -89,6 +112,7 @@ int ti_clk_setup_ll_ops(struct ti_clk_ll_ops *ops)
ti_clk_ll_ops = ops;
ops->clk_readl = clk_memmap_readl;
ops->clk_writel = clk_memmap_writel;
ops->clk_rmw = clk_memmap_rmw;
return 0;
}

2
include/linux/clk/ti.h
View File

@ -211,6 +211,7 @@ enum {
* struct ti_clk_ll_ops - low-level ops for clocks
* @clk_readl: pointer to register read function
* @clk_writel: pointer to register write function
* @clk_rmw: pointer to register read-modify-write function
* @clkdm_clk_enable: pointer to clockdomain enable function
* @clkdm_clk_disable: pointer to clockdomain disable function
* @clkdm_lookup: pointer to clockdomain lookup function
@ -226,6 +227,7 @@ enum {
struct ti_clk_ll_ops {
u32 (*clk_readl)(const struct clk_omap_reg *reg);
void (*clk_writel)(u32 val, const struct clk_omap_reg *reg);
void (*clk_rmw)(u32 val, u32 mask, const struct clk_omap_reg *reg);
int (*clkdm_clk_enable)(struct clockdomain *clkdm, struct clk *clk);
int (*clkdm_clk_disable)(struct clockdomain *clkdm,
struct clk *clk);