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Message-ID: <1430328109-537-9-git-send-email-rklein@nvidia.com>
Date: Wed, 29 Apr 2015 13:21:38 -0400
From: Rhyland Klein <rklein@...dia.com>
To: Peter De Schrijver <pdeschrijver@...dia.com>
CC: Mike Turquette <mturquette@...aro.org>,
Stephen Warren <swarren@...dotorg.org>,
Stephen Boyd <sboyd@...eaurora.org>,
Thierry Reding <thierry.reding@...il.com>,
Alexandre Courbot <gnurou@...il.com>,
linux-clk@...r.kernel.org, linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org, Rhyland Klein <rklein@...dia.com>
Subject: [PATCH v2 08/19] clk: tegra: pll: Add logic for handling SDM data
This adds logic for taking SDM_DIN (Sigma Delta Modulator) setting into
the equation to calculate the effective N value for PLL which supports
fractional divider.
The effective N = NDIV + 1/2 + SDM_DIN/2^13, where NDIV is the integer
feedback divider.
Signed-off-by: Rhyland Klein <rklein@...dia.com>
---
drivers/clk/tegra/clk-pll.c | 52 ++++++++++++++++++++++++++++++++++++++++++-
drivers/clk/tegra/clk.h | 9 +++++++-
2 files changed, 59 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
index 13d86c5b234d..c64b75185d6b 100644
--- a/drivers/clk/tegra/clk-pll.c
+++ b/drivers/clk/tegra/clk-pll.c
@@ -187,17 +187,23 @@
#define pll_readl_base(p) pll_readl(p->params->base_reg, p)
#define pll_readl_misc(p) pll_readl(p->params->misc_reg, p)
#define pll_override_readl(offset, p) readl_relaxed(p->pmc + offset)
+#define pll_readl_sdm_din(p) pll_readl(p->params->sdm_din_reg, p)
+#define pll_readl_sdm_ctrl(p) pll_readl(p->params->sdm_ctrl_reg, p)
#define pll_writel(val, offset, p) writel_relaxed(val, p->clk_base + offset)
#define pll_writel_base(val, p) pll_writel(val, p->params->base_reg, p)
#define pll_writel_misc(val, p) pll_writel(val, p->params->misc_reg, p)
#define pll_override_writel(val, offset, p) writel(val, p->pmc + offset)
+#define pll_writel_sdm_din(val, p) pll_writel(val, p->params->sdm_din_reg, p)
+#define pll_writel_sdm_ctrl(val, p) pll_writel(val, p->params->sdm_ctrl_reg, p)
#define mask(w) ((1 << (w)) - 1)
#define divm_mask(p) mask(p->params->div_nmp->divm_width)
#define divn_mask(p) mask(p->params->div_nmp->divn_width)
#define divp_mask(p) (p->params->flags & TEGRA_PLLU ? PLLU_POST_DIVP_MASK :\
mask(p->params->div_nmp->divp_width))
+#define sdm_din_mask(p) p->params->sdm_din_mask
+#define sdm_en_mask(p) p->params->sdm_ctrl_en_mask
#define divm_shift(p) (p)->params->div_nmp->divm_shift
#define divn_shift(p) (p)->params->div_nmp->divn_shift
@@ -211,6 +217,9 @@
#define divn_max(p) (divn_mask(p))
#define divp_max(p) (1 << (divp_mask(p)))
+#define sdin_din_to_data(din) ((u16)((din) ? : 0xFFFFU))
+#define sdin_data_to_din(dat) (((dat) == 0xFFFFU) ? 0 : (s16)dat)
+
static struct div_nmp default_nmp = {
.divn_shift = PLL_BASE_DIVN_SHIFT,
.divn_width = PLL_BASE_DIVN_WIDTH,
@@ -429,6 +438,7 @@ static int _get_table_rate(struct clk_hw *hw,
cfg->n = sel->n;
cfg->p = sel->p;
cfg->cpcon = sel->cpcon;
+ cfg->sdm_data = sel->sdm_data;
return 0;
}
@@ -495,6 +505,28 @@ static int _calc_rate(struct clk_hw *hw, struct tegra_clk_pll_freq_table *cfg,
return 0;
}
+static void clk_pll_set_sdm_data(struct clk_hw *hw,
+ struct tegra_clk_pll_freq_table *cfg)
+{
+ struct tegra_clk_pll *pll = to_clk_pll(hw);
+ u32 val;
+
+ if (!pll->params->sdm_din_reg)
+ return;
+
+ if (cfg->sdm_data) {
+ val = pll_readl_sdm_din(pll) & (~sdm_din_mask(pll));
+ val |= sdin_data_to_din(cfg->sdm_data) & sdm_din_mask(pll);
+ pll_writel_sdm_din(val, pll);
+ }
+
+ val = pll_readl_sdm_ctrl(pll);
+ if (!cfg->sdm_data != !(val & pll->params->sdm_ctrl_en_mask)) {
+ val ^= pll->params->sdm_ctrl_en_mask;
+ pll_writel_sdm_ctrl(val, pll);
+ }
+}
+
static void _update_pll_mnp(struct tegra_clk_pll *pll,
struct tegra_clk_pll_freq_table *cfg)
{
@@ -527,6 +559,8 @@ static void _update_pll_mnp(struct tegra_clk_pll *pll,
(cfg->p << divp_shift(pll));
pll_writel_base(val, pll);
+
+ clk_pll_set_sdm_data(&pll->hw, cfg);
}
}
@@ -552,6 +586,14 @@ static void _get_pll_mnp(struct tegra_clk_pll *pll,
cfg->m = (val >> div_nmp->divm_shift) & divm_mask(pll);
cfg->n = (val >> div_nmp->divn_shift) & divn_mask(pll);
cfg->p = (val >> div_nmp->divp_shift) & divp_mask(pll);
+
+ if (pll->params->sdm_din_reg) {
+ if (sdm_en_mask(pll) & pll_readl_sdm_ctrl(pll)) {
+ val = pll_readl_sdm_din(pll);
+ cfg->sdm_data = val & sdm_din_mask(pll);
+ cfg->sdm_data = sdin_din_to_data(cfg->sdm_data);
+ }
+ }
}
}
@@ -633,7 +675,8 @@ static int clk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
_get_pll_mnp(pll, &old_cfg);
- if (old_cfg.m != cfg.m || old_cfg.n != cfg.n || old_cfg.p != cfg.p)
+ if (old_cfg.m != cfg.m || old_cfg.n != cfg.n || old_cfg.p != cfg.p ||
+ old_cfg.sdm_data != cfg.sdm_data)
ret = _program_pll(hw, &cfg, rate);
if (pll->lock)
@@ -697,6 +740,9 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hw,
pdiv = 1;
}
+ if (pll->params->set_gain)
+ pll->params->set_gain(&cfg);
+
cfg.m *= pdiv;
rate *= cfg.n;
@@ -978,6 +1024,7 @@ static int clk_pllxc_set_rate(struct clk_hw *hw, unsigned long rate,
static long clk_pll_ramp_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
+ struct tegra_clk_pll *pll = to_clk_pll(hw);
struct tegra_clk_pll_freq_table cfg;
int ret, p_div;
u64 output_rate = *prate;
@@ -990,6 +1037,9 @@ static long clk_pll_ramp_round_rate(struct clk_hw *hw, unsigned long rate,
if (p_div < 0)
return p_div;
+ if (pll->params->set_gain)
+ pll->params->set_gain(&cfg);
+
output_rate *= cfg.n;
do_div(output_rate, cfg.m * p_div);
diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
index 03babba1c3b4..ef5754f64622 100644
--- a/drivers/clk/tegra/clk.h
+++ b/drivers/clk/tegra/clk.h
@@ -110,14 +110,16 @@ struct clk *tegra_clk_register_mc(const char *name, const char *parent_name,
* @m: input divider
* @p: post divider
* @cpcon: charge pump current
+ * @sdm_data: fraction divider setting (0 = disabled)
*/
struct tegra_clk_pll_freq_table {
unsigned long input_rate;
unsigned long output_rate;
- u16 n;
+ u32 n;
u16 m;
u8 p;
u8 cpcon;
+ u16 sdm_data;
};
/**
@@ -213,6 +215,10 @@ struct tegra_clk_pll_params {
u32 lock_enable_bit_idx;
u32 iddq_reg;
u32 iddq_bit_idx;
+ u32 sdm_din_reg;
+ u32 sdm_din_mask;
+ u32 sdm_ctrl_reg;
+ u32 sdm_ctrl_en_mask;
u32 aux_reg;
u32 dyn_ramp_reg;
u32 ext_misc_reg[MAX_PLL_MISC_REG_COUNT];
@@ -227,6 +233,7 @@ struct tegra_clk_pll_params {
struct div_nmp *div_nmp;
struct tegra_clk_pll_freq_table *freq_table;
unsigned long fixed_rate;
+ void (*set_gain)(struct tegra_clk_pll_freq_table *cfg);
};
#define TEGRA_PLL_USE_LOCK BIT(0)
--
1.7.9.5
--
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