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clk: qcom: Introduce parent_map tables

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In the current parent mapping code, we can get duplicate or inconsistent
indexes, which leads to discrepancy between the number of elements in the
array and the number of parents. Until now, this was solved with some
reordering but this is not always possible.

This patch introduces index tables that are used to define the relations
between the PLL source and the hardware mux configuration value.
To accomplish this, here we do the following:
 - Define a parent_map struct to map the relations between PLL source index
 and register configuration value.
 - Add a qcom_find_src_index() function for finding the index of a clock
 matching the specific PLL configuration.
 - Update the {set,get}_parent RCG functions use the newly introduced
 parent_map struct.
 - Convert all existing drivers to the new parent_map tables.

Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Georgi Djakov
2015-03-20 18:30:26 +02:00
committed by Stephen Boyd
parent fae507afbd
commit 293d2e97b3
15 changed files with 336 additions and 284 deletions
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14
drivers/clk/qcom/clk-rcg2.c
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@@ -75,7 +75,7 @@ static u8 clk_rcg2_get_parent(struct clk_hw *hw)
cfg >>= CFG_SRC_SEL_SHIFT;
for (i = 0; i < num_parents; i++)
if (cfg == rcg->parent_map[i])
if (cfg == rcg->parent_map[i].cfg)
return i;
err:
@@ -114,10 +114,10 @@ static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index)
{
struct clk_rcg2 *rcg = to_clk_rcg2(hw);
int ret;
u32 cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
CFG_SRC_SEL_MASK,
rcg->parent_map[index] << CFG_SRC_SEL_SHIFT);
CFG_SRC_SEL_MASK, cfg);
if (ret)
return ret;
@@ -222,7 +222,11 @@ static long clk_rcg2_determine_rate(struct clk_hw *hw, unsigned long rate,
static int clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)
{
u32 cfg, mask;
int ret;
struct clk_hw *hw = &rcg->clkr.hw;
int ret, index = qcom_find_src_index(hw, rcg->parent_map, f->src);
if (index < 0)
return index;
if (rcg->mnd_width && f->n) {
mask = BIT(rcg->mnd_width) - 1;
@@ -245,7 +249,7 @@ static int clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)
mask = BIT(rcg->hid_width) - 1;
mask |= CFG_SRC_SEL_MASK | CFG_MODE_MASK;
cfg = f->pre_div << CFG_SRC_DIV_SHIFT;
cfg |= rcg->parent_map[f->src] << CFG_SRC_SEL_SHIFT;
cfg |= rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
if (rcg->mnd_width && f->n && (f->m != f->n))
cfg |= CFG_MODE_DUAL_EDGE;
ret = regmap_update_bits(rcg->clkr.regmap,