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authorPeter De Schrijver <pdeschrijver@nvidia.com>2013-04-03 18:40:39 +0400
committerStephen Warren <swarren@nvidia.com>2013-04-05 02:10:45 +0400
commit0b6525acd13f2d33cd3be86d0dbd2ddd1ffeda8f (patch)
tree989c920b532d4d5d7372c275ed828356cff9c581 /drivers/clk/tegra
parent7ba28813b41120dd67329fd04dc732ea7fef05a0 (diff)
downloadlinux-0b6525acd13f2d33cd3be86d0dbd2ddd1ffeda8f.tar.xz
clk: tegra: Add PLL post divider table
Some PLLs in Tegra114 don't use a power of 2 mapping for the post divider. Introduce a table based approach and switch PLLU to it. Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com> Acked-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'drivers/clk/tegra')
-rw-r--r--drivers/clk/tegra/clk-pll.c38
-rw-r--r--drivers/clk/tegra/clk-tegra20.c7
-rw-r--r--drivers/clk/tegra/clk-tegra30.c7
-rw-r--r--drivers/clk/tegra/clk.h13
4 files changed, 59 insertions, 6 deletions
diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
index eaab060cda24..ccb367ee7e78 100644
--- a/drivers/clk/tegra/clk-pll.c
+++ b/drivers/clk/tegra/clk-pll.c
@@ -266,6 +266,7 @@ static int _calc_rate(struct clk_hw *hw, struct tegra_clk_pll_freq_table *cfg,
unsigned long rate, unsigned long parent_rate)
{
struct tegra_clk_pll *pll = to_clk_pll(hw);
+ struct pdiv_map *p_tohw = pll->params->pdiv_tohw;
unsigned long cfreq;
u32 p_div = 0;
@@ -299,7 +300,6 @@ static int _calc_rate(struct clk_hw *hw, struct tegra_clk_pll_freq_table *cfg,
cfg->output_rate <<= 1)
p_div++;
- cfg->p = p_div;
cfg->m = parent_rate / cfreq;
cfg->n = cfg->output_rate / cfreq;
cfg->cpcon = OUT_OF_TABLE_CPCON;
@@ -312,8 +312,19 @@ static int _calc_rate(struct clk_hw *hw, struct tegra_clk_pll_freq_table *cfg,
return -EINVAL;
}
- if (pll->flags & TEGRA_PLLU)
- cfg->p ^= 1;
+ if (p_tohw) {
+ p_div = 1 << p_div;
+ while (p_tohw->pdiv) {
+ if (p_div <= p_tohw->pdiv) {
+ cfg->p = p_tohw->hw_val;
+ break;
+ }
+ p_tohw++;
+ }
+ if (!p_tohw->pdiv)
+ return -EINVAL;
+ } else
+ cfg->p = p_div;
return 0;
}
@@ -460,8 +471,10 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hw,
{
struct tegra_clk_pll *pll = to_clk_pll(hw);
struct tegra_clk_pll_freq_table cfg;
+ struct pdiv_map *p_tohw = pll->params->pdiv_tohw;
u32 val;
u64 rate = parent_rate;
+ int pdiv;
val = pll_readl_base(pll);
@@ -480,10 +493,23 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hw,
_get_pll_mnp(pll, &cfg);
- if (pll->flags & TEGRA_PLLU)
- cfg.p ^= 1;
+ if (p_tohw) {
+ while (p_tohw->pdiv) {
+ if (cfg.p == p_tohw->hw_val) {
+ pdiv = p_tohw->pdiv;
+ break;
+ }
+ p_tohw++;
+ }
+
+ if (!p_tohw->pdiv) {
+ WARN_ON(1);
+ pdiv = 1;
+ }
+ } else
+ pdiv = 1 << cfg.p;
- cfg.m *= 1 << cfg.p;
+ cfg.m *= pdiv;
rate *= cfg.n;
do_div(rate, cfg.m);
diff --git a/drivers/clk/tegra/clk-tegra20.c b/drivers/clk/tegra/clk-tegra20.c
index c2a1c4cae47c..f215bf10c9ff 100644
--- a/drivers/clk/tegra/clk-tegra20.c
+++ b/drivers/clk/tegra/clk-tegra20.c
@@ -441,6 +441,12 @@ static struct tegra_clk_pll_params pll_d_params = {
.lock_delay = 1000,
};
+static struct pdiv_map pllu_p[] = {
+ { .pdiv = 1, .hw_val = 1 },
+ { .pdiv = 2, .hw_val = 0 },
+ { .pdiv = 0, .hw_val = 0 },
+};
+
static struct tegra_clk_pll_params pll_u_params = {
.input_min = 2000000,
.input_max = 40000000,
@@ -453,6 +459,7 @@ static struct tegra_clk_pll_params pll_u_params = {
.lock_bit_idx = PLL_BASE_LOCK,
.lock_enable_bit_idx = PLLDU_MISC_LOCK_ENABLE,
.lock_delay = 1000,
+ .pdiv_tohw = pllu_p,
};
static struct tegra_clk_pll_params pll_x_params = {
diff --git a/drivers/clk/tegra/clk-tegra30.c b/drivers/clk/tegra/clk-tegra30.c
index 02609d125e0e..fe768fe769b2 100644
--- a/drivers/clk/tegra/clk-tegra30.c
+++ b/drivers/clk/tegra/clk-tegra30.c
@@ -467,6 +467,12 @@ static struct tegra_clk_pll_freq_table pll_d_freq_table[] = {
{ 0, 0, 0, 0, 0, 0 },
};
+static struct pdiv_map pllu_p[] = {
+ { .pdiv = 1, .hw_val = 1 },
+ { .pdiv = 2, .hw_val = 0 },
+ { .pdiv = 0, .hw_val = 0 },
+};
+
static struct tegra_clk_pll_freq_table pll_u_freq_table[] = {
{ 12000000, 480000000, 960, 12, 0, 12},
{ 13000000, 480000000, 960, 13, 0, 12},
@@ -640,6 +646,7 @@ static struct tegra_clk_pll_params pll_u_params = {
.lock_bit_idx = PLL_BASE_LOCK,
.lock_enable_bit_idx = PLLDU_MISC_LOCK_ENABLE,
.lock_delay = 1000,
+ .pdiv_tohw = pllu_p,
};
static struct tegra_clk_pll_params pll_x_params = {
diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
index 17ddb22f7a50..925da451bd19 100644
--- a/drivers/clk/tegra/clk.h
+++ b/drivers/clk/tegra/clk.h
@@ -117,6 +117,17 @@ struct tegra_clk_pll_freq_table {
};
/**
+ * struct pdiv_map - map post divider to hw value
+ *
+ * @pdiv: post divider
+ * @hw_val: value to be written to the PLL hw
+ */
+struct pdiv_map {
+ u8 pdiv;
+ u8 hw_val;
+};
+
+/**
* struct clk_pll_params - PLL parameters
*
* @input_min: Minimum input frequency
@@ -146,6 +157,8 @@ struct tegra_clk_pll_params {
u32 lock_bit_idx;
u32 lock_enable_bit_idx;
int lock_delay;
+ int max_p;
+ struct pdiv_map *pdiv_tohw;
};
/**