[PATCH 2/5] clk: ti: add support for register read-modify-write low-level operation
Tero Kristo
t-kristo at ti.com
Thu Feb 15 04:49:48 PST 2018
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 at ti.com>
---
drivers/clk/ti/clk.c | 24 ++++++++++++++++++++++++
include/linux/clk/ti.h | 2 ++
2 files changed, 26 insertions(+)
diff --git a/drivers/clk/ti/clk.c b/drivers/clk/ti/clk.c
index f4d6802..4efa2c9 100644
--- a/drivers/clk/ti/clk.c
+++ b/drivers/clk/ti/clk.c
@@ -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;
}
diff --git a/include/linux/clk/ti.h b/include/linux/clk/ti.h
index d18da83..9e86114 100644
--- a/include/linux/clk/ti.h
+++ b/include/linux/clk/ti.h
@@ -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);
--
1.9.1
--
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
More information about the linux-arm-kernel
mailing list