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clk: renesas: rcar-gen3: Add Z2 clock divider support 

This patch adds Z2 clock divider support for R-Car Gen3 SoC.

Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
This commit is contained in:
Takeshi Kihara 2018-01-29 19:01:50 +01:00 committed by Geert Uytterhoeven
parent 3391891fa9
commit 41ceeb5fef
2 changed files with 17 additions and 6 deletions
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22
drivers/clk/renesas/rcar-gen3-cpg.c
View File

@ -63,7 +63,7 @@ static void cpg_simple_notifier_register(struct raw_notifier_head *notifiers,
}
/*
* Z Clock
* Z Clock & Z2 Clock
*
* Traits of this clock:
* prepare - clk_prepare only ensures that parents are prepared
@ -75,11 +75,13 @@ static void cpg_simple_notifier_register(struct raw_notifier_head *notifiers,
#define CPG_FRQCRB_KICK BIT(31)
#define CPG_FRQCRC 0x000000e0
#define CPG_FRQCRC_ZFC_MASK GENMASK(12, 8)
#define CPG_FRQCRC_Z2FC_MASK GENMASK(4, 0)
struct cpg_z_clk {
struct clk_hw hw;
void __iomem *reg;
void __iomem *kick_reg;
unsigned long mask;
};
#define to_z_clk(_hw) container_of(_hw, struct cpg_z_clk, hw)
@ -89,8 +91,10 @@ static unsigned long cpg_z_clk_recalc_rate(struct clk_hw *hw,
{
struct cpg_z_clk *zclk = to_z_clk(hw);
unsigned int mult;
u32 val;
mult = 32 - FIELD_GET(CPG_FRQCRC_ZFC_MASK, clk_readl(zclk->reg));
val = clk_readl(zclk->reg) & zclk->mask;
mult = 32 - (val >> __ffs(zclk->mask));
/* Factor of 2 is for fixed divider */
return DIV_ROUND_CLOSEST_ULL((u64)parent_rate * mult, 32 * 2);
@ -124,8 +128,8 @@ static int cpg_z_clk_set_rate(struct clk_hw *hw, unsigned long rate,
if (clk_readl(zclk->kick_reg) & CPG_FRQCRB_KICK)
return -EBUSY;
val = clk_readl(zclk->reg) & ~CPG_FRQCRC_ZFC_MASK;
val |= FIELD_PREP(CPG_FRQCRC_ZFC_MASK, 32 - mult);
val = clk_readl(zclk->reg) & ~zclk->mask;
val |= ((32 - mult) << __ffs(zclk->mask)) & zclk->mask;
clk_writel(val, zclk->reg);
/*
@ -163,7 +167,8 @@ static const struct clk_ops cpg_z_clk_ops = {
static struct clk * __init cpg_z_clk_register(const char *name,
const char *parent_name,
void __iomem *reg)
void __iomem *reg,
unsigned long mask)
{
struct clk_init_data init;
struct cpg_z_clk *zclk;
@ -182,6 +187,7 @@ static struct clk * __init cpg_z_clk_register(const char *name,
zclk->reg = reg + CPG_FRQCRC;
zclk->kick_reg = reg + CPG_FRQCRB;
zclk->hw.init = &init;
zclk->mask = mask;
clk = clk_register(NULL, &zclk->hw);
if (IS_ERR(clk))
@ -551,7 +557,11 @@ struct clk * __init rcar_gen3_cpg_clk_register(struct device *dev,
case CLK_TYPE_GEN3_Z:
return cpg_z_clk_register(core->name, __clk_get_name(parent),
base);
base, CPG_FRQCRC_ZFC_MASK);
case CLK_TYPE_GEN3_Z2:
return cpg_z_clk_register(core->name, __clk_get_name(parent),
base, CPG_FRQCRC_Z2FC_MASK);
default:
return ERR_PTR(-EINVAL);

1
drivers/clk/renesas/rcar-gen3-cpg.h
View File

@ -22,6 +22,7 @@ enum rcar_gen3_clk_types {
CLK_TYPE_GEN3_R,
CLK_TYPE_GEN3_PE,
CLK_TYPE_GEN3_Z,
CLK_TYPE_GEN3_Z2,
};
#define DEF_GEN3_SD(_name, _id, _parent, _offset) \