Commit d4f2016f authored by Michael Turquette's avatar Michael Turquette

Merge branch 'clk-next-shmobile' into clk-next

parents 40ba3f0f bfadcadf
......@@ -7,11 +7,16 @@ to 64.
Required Properties:
- compatible: Must be one of the following
- "renesas,r8a73a4-div6-clock" for R8A73A4 (R-Mobile APE6) DIV6 clocks
- "renesas,r8a7740-div6-clock" for R8A7740 (R-Mobile A1) DIV6 clocks
- "renesas,r8a7790-div6-clock" for R8A7790 (R-Car H2) DIV6 clocks
- "renesas,r8a7791-div6-clock" for R8A7791 (R-Car M2) DIV6 clocks
- "renesas,sh73a0-div6-clock" for SH73A0 (SH-Mobile AG5) DIV6 clocks
- "renesas,cpg-div6-clock" for generic DIV6 clocks
- reg: Base address and length of the memory resource used by the DIV6 clock
- clocks: Reference to the parent clock
- clocks: Reference to the parent clock(s); either one, four, or eight
clocks must be specified. For clocks with multiple parents, invalid
settings must be specified as "<0>".
- #clock-cells: Must be 0
- clock-output-names: The name of the clock as a free-form string
......@@ -19,10 +24,11 @@ Required Properties:
Example
-------
sd2_clk: sd2_clk@e6150078 {
compatible = "renesas,r8a7790-div6-clock", "renesas,cpg-div6-clock";
reg = <0 0xe6150078 0 4>;
clocks = <&pll1_div2_clk>;
sdhi2_clk: sdhi2_clk@e615007c {
compatible = "renesas,r8a73a4-div6-clock", "renesas,cpg-div6-clock";
reg = <0 0xe615007c 0 4>;
clocks = <&pll1_div2_clk>, <&cpg_clocks R8A73A4_CLK_PLL2S>,
<0>, <&extal2_clk>;
#clock-cells = <0>;
clock-output-names = "sd2";
clock-output-names = "sdhi2ck";
};
......@@ -32,6 +32,9 @@ struct div6_clock {
struct clk_hw hw;
void __iomem *reg;
unsigned int div;
u32 src_shift;
u32 src_width;
u8 *parents;
};
#define to_div6_clock(_hw) container_of(_hw, struct div6_clock, hw)
......@@ -39,8 +42,11 @@ struct div6_clock {
static int cpg_div6_clock_enable(struct clk_hw *hw)
{
struct div6_clock *clock = to_div6_clock(hw);
u32 val;
clk_writel(CPG_DIV6_DIV(clock->div - 1), clock->reg);
val = (clk_readl(clock->reg) & ~(CPG_DIV6_DIV_MASK | CPG_DIV6_CKSTP))
| CPG_DIV6_DIV(clock->div - 1);
clk_writel(val, clock->reg);
return 0;
}
......@@ -52,7 +58,7 @@ static void cpg_div6_clock_disable(struct clk_hw *hw)
/* DIV6 clocks require the divisor field to be non-zero when stopping
* the clock.
*/
clk_writel(CPG_DIV6_CKSTP | CPG_DIV6_DIV(CPG_DIV6_DIV_MASK),
clk_writel(clk_readl(clock->reg) | CPG_DIV6_CKSTP | CPG_DIV6_DIV_MASK,
clock->reg);
}
......@@ -94,12 +100,53 @@ static int cpg_div6_clock_set_rate(struct clk_hw *hw, unsigned long rate,
{
struct div6_clock *clock = to_div6_clock(hw);
unsigned int div = cpg_div6_clock_calc_div(rate, parent_rate);
u32 val;
clock->div = div;
val = clk_readl(clock->reg) & ~CPG_DIV6_DIV_MASK;
/* Only program the new divisor if the clock isn't stopped. */
if (!(clk_readl(clock->reg) & CPG_DIV6_CKSTP))
clk_writel(CPG_DIV6_DIV(clock->div - 1), clock->reg);
if (!(val & CPG_DIV6_CKSTP))
clk_writel(val | CPG_DIV6_DIV(clock->div - 1), clock->reg);
return 0;
}
static u8 cpg_div6_clock_get_parent(struct clk_hw *hw)
{
struct div6_clock *clock = to_div6_clock(hw);
unsigned int i;
u8 hw_index;
if (clock->src_width == 0)
return 0;
hw_index = (clk_readl(clock->reg) >> clock->src_shift) &
(BIT(clock->src_width) - 1);
for (i = 0; i < __clk_get_num_parents(hw->clk); i++) {
if (clock->parents[i] == hw_index)
return i;
}
pr_err("%s: %s DIV6 clock set to invalid parent %u\n",
__func__, __clk_get_name(hw->clk), hw_index);
return 0;
}
static int cpg_div6_clock_set_parent(struct clk_hw *hw, u8 index)
{
struct div6_clock *clock = to_div6_clock(hw);
u8 hw_index;
u32 mask;
if (index >= __clk_get_num_parents(hw->clk))
return -EINVAL;
mask = ~((BIT(clock->src_width) - 1) << clock->src_shift);
hw_index = clock->parents[index];
clk_writel((clk_readl(clock->reg) & mask) |
(hw_index << clock->src_shift), clock->reg);
return 0;
}
......@@ -108,6 +155,8 @@ static const struct clk_ops cpg_div6_clock_ops = {
.enable = cpg_div6_clock_enable,
.disable = cpg_div6_clock_disable,
.is_enabled = cpg_div6_clock_is_enabled,
.get_parent = cpg_div6_clock_get_parent,
.set_parent = cpg_div6_clock_set_parent,
.recalc_rate = cpg_div6_clock_recalc_rate,
.round_rate = cpg_div6_clock_round_rate,
.set_rate = cpg_div6_clock_set_rate,
......@@ -115,20 +164,33 @@ static const struct clk_ops cpg_div6_clock_ops = {
static void __init cpg_div6_clock_init(struct device_node *np)
{
unsigned int num_parents, valid_parents;
const char **parent_names;
struct clk_init_data init;
struct div6_clock *clock;
const char *parent_name;
const char *name;
struct clk *clk;
unsigned int i;
int ret;
clock = kzalloc(sizeof(*clock), GFP_KERNEL);
if (!clock) {
pr_err("%s: failed to allocate %s DIV6 clock\n",
if (!clock)
return;
num_parents = of_clk_get_parent_count(np);
if (num_parents < 1) {
pr_err("%s: no parent found for %s DIV6 clock\n",
__func__, np->name);
return;
}
clock->parents = kmalloc_array(num_parents, sizeof(*clock->parents),
GFP_KERNEL);
parent_names = kmalloc_array(num_parents, sizeof(*parent_names),
GFP_KERNEL);
if (!parent_names)
return;
/* Remap the clock register and read the divisor. Disabling the
* clock overwrites the divisor, so we need to cache its value for the
* enable operation.
......@@ -150,9 +212,34 @@ static void __init cpg_div6_clock_init(struct device_node *np)
goto error;
}
parent_name = of_clk_get_parent_name(np, 0);
if (parent_name == NULL) {
pr_err("%s: failed to get %s DIV6 clock parent name\n",
for (i = 0, valid_parents = 0; i < num_parents; i++) {
const char *name = of_clk_get_parent_name(np, i);
if (name) {
parent_names[valid_parents] = name;
clock->parents[valid_parents] = i;
valid_parents++;
}
}
switch (num_parents) {
case 1:
/* fixed parent clock */
clock->src_shift = clock->src_width = 0;
break;
case 4:
/* clock with EXSRC bits 6-7 */
clock->src_shift = 6;
clock->src_width = 2;
break;
case 8:
/* VCLK with EXSRC bits 12-14 */
clock->src_shift = 12;
clock->src_width = 3;
break;
default:
pr_err("%s: invalid number of parents for DIV6 clock %s\n",
__func__, np->name);
goto error;
}
......@@ -161,8 +248,8 @@ static void __init cpg_div6_clock_init(struct device_node *np)
init.name = name;
init.ops = &cpg_div6_clock_ops;
init.flags = CLK_IS_BASIC;
init.parent_names = &parent_name;
init.num_parents = 1;
init.parent_names = parent_names;
init.num_parents = valid_parents;
clock->hw.init = &init;
......@@ -175,11 +262,13 @@ static void __init cpg_div6_clock_init(struct device_node *np)
of_clk_add_provider(np, of_clk_src_simple_get, clk);
kfree(parent_names);
return;
error:
if (clock->reg)
iounmap(clock->reg);
kfree(parent_names);
kfree(clock);
}
CLK_OF_DECLARE(cpg_div6_clk, "renesas,cpg-div6-clock", cpg_div6_clock_init);
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