[PATCH v2 4/8] clk: sunxi-ng: Support multiple variable pre-dividers

Chen-Yu Tsai
2017-05-03T03:09:25Z

On the A83T, the AHB1 clock has a shared pre-divider on the two
PLL-PERIPH clock parents. To support such instances of shared
pre-dividers, this patch extends the mux clock type to support
multiple variable pre-dividers.

As the pre-dividers are only used to calculate the rate, but
do not participate in the factorization process, this is fairly
straightforward.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
---
drivers/clk/sunxi-ng/ccu-sun50i-a64.c | 10 +++++-----
drivers/clk/sunxi-ng/ccu-sun6i-a31.c | 10 +++++-----
drivers/clk/sunxi-ng/ccu-sun8i-a23.c | 10 +++++-----
drivers/clk/sunxi-ng/ccu-sun8i-a33.c | 10 +++++-----
drivers/clk/sunxi-ng/ccu-sun8i-h3.c | 10 +++++-----
drivers/clk/sunxi-ng/ccu-sun8i-r.c | 10 +++++-----
drivers/clk/sunxi-ng/ccu-sun8i-v3s.c | 10 +++++-----
drivers/clk/sunxi-ng/ccu_mux.c | 15 ++++++++-------
drivers/clk/sunxi-ng/ccu_mux.h | 13 ++++++++-----
9 files changed, 51 insertions(+), 47 deletions(-)

diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
index f54114c607df..2bb4cabf802f 100644
--- a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
+++ b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
@@ -211,6 +211,9 @@ static SUNXI_CCU_M(axi_clk, "axi", "cpux", 0x050, 0, 2, 0);

static const char * const ahb1_parents[] = { "osc32k", "osc24M",
"axi", "pll-periph0" };
+static const struct ccu_mux_var_prediv ahb1_predivs[] = {
+ { .index = 3, .shift = 6, .width = 2 },
+};
static struct ccu_div ahb1_clk = {
.div = _SUNXI_CCU_DIV_FLAGS(4, 2, CLK_DIVIDER_POWER_OF_TWO),

@@ -218,11 +221,8 @@ static struct ccu_div ahb1_clk = {
.shift = 12,
.width = 2,

- .variable_prediv = {
- .index = 3,
- .shift = 6,
- .width = 2,
- },
+ .var_predivs = ahb1_predivs,
+ .n_var_predivs = ARRAY_SIZE(ahb1_predivs),
},

.common = {
diff --git a/drivers/clk/sunxi-ng/ccu-sun6i-a31.c b/drivers/clk/sunxi-ng/ccu-sun6i-a31.c
index 89e68d29bf45..bc9f2ca19233 100644
--- a/drivers/clk/sunxi-ng/ccu-sun6i-a31.c
+++ b/drivers/clk/sunxi-ng/ccu-sun6i-a31.c
@@ -195,6 +195,9 @@ static SUNXI_CCU_DIV_TABLE(axi_clk, "axi", "cpu",

static const char * const ahb1_parents[] = { "osc32k", "osc24M",
"axi", "pll-periph" };
+static const struct ccu_mux_var_prediv ahb1_predivs[] = {
+ { .index = 3, .shift = 6, .width = 2 },
+};

static struct ccu_div ahb1_clk = {
.div = _SUNXI_CCU_DIV_FLAGS(4, 2, CLK_DIVIDER_POWER_OF_TWO),
@@ -203,11 +206,8 @@ static struct ccu_div ahb1_clk = {
.shift = 12,
.width = 2,

- .variable_prediv = {
- .index = 3,
- .shift = 6,
- .width = 2,
- },
+ .var_predivs = ahb1_predivs,
+ .n_var_predivs = ARRAY_SIZE(ahb1_predivs),
},

.common = {
diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-a23.c b/drivers/clk/sunxi-ng/ccu-sun8i-a23.c
index 5c6d37bdf247..8a753ed0426d 100644
--- a/drivers/clk/sunxi-ng/ccu-sun8i-a23.c
+++ b/drivers/clk/sunxi-ng/ccu-sun8i-a23.c
@@ -169,6 +169,9 @@ static SUNXI_CCU_M(axi_clk, "axi", "cpux", 0x050, 0, 2, 0);

static const char * const ahb1_parents[] = { "osc32k", "osc24M",
"axi" , "pll-periph" };
+static const struct ccu_mux_var_prediv ahb1_predivs[] = {
+ { .index = 3, .shift = 6, .width = 2 },
+};
static struct ccu_div ahb1_clk = {
.div = _SUNXI_CCU_DIV_FLAGS(4, 2, CLK_DIVIDER_POWER_OF_TWO),

@@ -176,11 +179,8 @@ static struct ccu_div ahb1_clk = {
.shift = 12,
.width = 2,

- .variable_prediv = {
- .index = 3,
- .shift = 6,
- .width = 2,
- },
+ .var_predivs = ahb1_predivs,
+ .n_var_predivs = ARRAY_SIZE(ahb1_predivs),
},

.common = {
diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-a33.c b/drivers/clk/sunxi-ng/ccu-sun8i-a33.c
index 8d38e6510e29..10b38dc46f75 100644
--- a/drivers/clk/sunxi-ng/ccu-sun8i-a33.c
+++ b/drivers/clk/sunxi-ng/ccu-sun8i-a33.c
@@ -180,6 +180,9 @@ static SUNXI_CCU_M(axi_clk, "axi", "cpux", 0x050, 0, 2, 0);

static const char * const ahb1_parents[] = { "osc32k", "osc24M",
"axi" , "pll-periph" };
+static const struct ccu_mux_var_prediv ahb1_predivs[] = {
+ { .index = 3, .shift = 6, .width = 2 },
+};
static struct ccu_div ahb1_clk = {
.div = _SUNXI_CCU_DIV_FLAGS(4, 2, CLK_DIVIDER_POWER_OF_TWO),

@@ -187,11 +190,8 @@ static struct ccu_div ahb1_clk = {
.shift = 12,
.width = 2,

- .variable_prediv = {
- .index = 3,
- .shift = 6,
- .width = 2,
- },
+ .var_predivs = ahb1_predivs,
+ .n_var_predivs = ARRAY_SIZE(ahb1_predivs),
},

.common = {
diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-h3.c b/drivers/clk/sunxi-ng/ccu-sun8i-h3.c
index 4cbc1b701b7c..62e4f0d2b2fc 100644
--- a/drivers/clk/sunxi-ng/ccu-sun8i-h3.c
+++ b/drivers/clk/sunxi-ng/ccu-sun8i-h3.c
@@ -141,6 +141,9 @@ static SUNXI_CCU_M(axi_clk, "axi", "cpux", 0x050, 0, 2, 0);

static const char * const ahb1_parents[] = { "osc32k", "osc24M",
"axi" , "pll-periph0" };
+static const struct ccu_mux_var_prediv ahb1_predivs[] = {
+ { .index = 3, .shift = 6, .width = 2 },
+};
static struct ccu_div ahb1_clk = {
.div = _SUNXI_CCU_DIV_FLAGS(4, 2, CLK_DIVIDER_POWER_OF_TWO),

@@ -148,11 +151,8 @@ static struct ccu_div ahb1_clk = {
.shift = 12,
.width = 2,

- .variable_prediv = {
- .index = 3,
- .shift = 6,
- .width = 2,
- },
+ .var_predivs = ahb1_predivs,
+ .n_var_predivs = ARRAY_SIZE(ahb1_predivs),
},

.common = {
diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-r.c b/drivers/clk/sunxi-ng/ccu-sun8i-r.c
index 119f47b568ea..de02be75785c 100644
--- a/drivers/clk/sunxi-ng/ccu-sun8i-r.c
+++ b/drivers/clk/sunxi-ng/ccu-sun8i-r.c
@@ -27,6 +27,9 @@

static const char * const ar100_parents[] = { "osc32k", "osc24M",
"pll-periph0", "iosc" };
+static const struct ccu_mux_var_prediv ar100_predivs[] = {
+ { .index = 2, .shift = 8, .width = 5 },
+};

static struct ccu_div ar100_clk = {
.div = _SUNXI_CCU_DIV_FLAGS(4, 2, CLK_DIVIDER_POWER_OF_TWO),
@@ -35,11 +38,8 @@ static struct ccu_div ar100_clk = {
.shift = 16,
.width = 2,

- .variable_prediv = {
- .index = 2,
- .shift = 8,
- .width = 5,
- },
+ .var_predivs = ar100_predivs,
+ .n_var_predivs = ARRAY_SIZE(ar100_predivs),
},

.common = {
diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-v3s.c b/drivers/clk/sunxi-ng/ccu-sun8i-v3s.c
index e58706b40ae9..cb7299a94cba 100644
--- a/drivers/clk/sunxi-ng/ccu-sun8i-v3s.c
+++ b/drivers/clk/sunxi-ng/ccu-sun8i-v3s.c
@@ -132,6 +132,9 @@ static SUNXI_CCU_M(axi_clk, "axi", "cpu", 0x050, 0, 2, 0);

static const char * const ahb1_parents[] = { "osc32k", "osc24M",
"axi", "pll-periph0" };
+static const struct ccu_mux_var_prediv ahb1_predivs[] = {
+ { .index = 3, .shift = 6, .width = 2 },
+};
static struct ccu_div ahb1_clk = {
.div = _SUNXI_CCU_DIV_FLAGS(4, 2, CLK_DIVIDER_POWER_OF_TWO),

@@ -139,11 +142,8 @@ static struct ccu_div ahb1_clk = {
.shift = 12,
.width = 2,

- .variable_prediv = {
- .index = 3,
- .shift = 6,
- .width = 2,
- },
+ .var_predivs = ahb1_predivs,
+ .n_var_predivs = ARRAY_SIZE(ahb1_predivs),
},

.common = {
diff --git a/drivers/clk/sunxi-ng/ccu_mux.c b/drivers/clk/sunxi-ng/ccu_mux.c
index c6bb1f523232..b1eaafac9f23 100644
--- a/drivers/clk/sunxi-ng/ccu_mux.c
+++ b/drivers/clk/sunxi-ng/ccu_mux.c
@@ -46,13 +46,14 @@ void ccu_mux_helper_adjust_parent_for_prediv(struct ccu_common *common,
prediv = cm->fixed_predivs[i].div;

if (common->features & CCU_FEATURE_VARIABLE_PREDIV)
- if (parent_index == cm->variable_prediv.index) {
- u8 div;
-
- div = reg >> cm->variable_prediv.shift;
- div &= (1 << cm->variable_prediv.width) - 1;
- prediv = div + 1;
- }
+ for (i = 0; i < cm->n_var_predivs; i++)
+ if (parent_index == cm->var_predivs[i].index) {
+ u8 div;
+
+ div = reg >> cm->var_predivs[i].shift;
+ div &= (1 << cm->var_predivs[i].width) - 1;
+ prediv = div + 1;
+ }

*parent_rate = *parent_rate / prediv;
}
diff --git a/drivers/clk/sunxi-ng/ccu_mux.h b/drivers/clk/sunxi-ng/ccu_mux.h
index 47aba3a48245..044262245c07 100644
--- a/drivers/clk/sunxi-ng/ccu_mux.h
+++ b/drivers/clk/sunxi-ng/ccu_mux.h
@@ -10,6 +10,12 @@ struct ccu_mux_fixed_prediv {
u16 div;
};

+struct ccu_mux_var_prediv {
+ u8 index;
+ u8 shift;
+ u8 width;
+};
+
struct ccu_mux_internal {
u8 shift;
u8 width;
@@ -18,11 +24,8 @@ struct ccu_mux_internal {
const struct ccu_mux_fixed_prediv *fixed_predivs;
u8 n_predivs;

- struct {
- u8 index;
- u8 shift;
- u8 width;
- } variable_prediv;
+ const struct ccu_mux_var_prediv *var_predivs;
+ u8 n_var_predivs;
};

#define _SUNXI_CCU_MUX_TABLE(_shift, _width, _table) \
--
2.11.0