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Message-ID: <1380878014-22088-2-git-send-email-pdeschrijver@nvidia.com>
Date: Fri, 4 Oct 2013 12:12:40 +0300
From: Peter De Schrijver <pdeschrijver@...dia.com>
To: Peter De Schrijver <pdeschrijver@...dia.com>
CC: Mike Turquette <mturquette@...aro.org>,
Stephen Warren <swarren@...dotorg.org>,
Rob Herring <rob.herring@...xeda.com>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ian.campbell@...rix.com>,
Prashant Gaikwad <pgaikwad@...dia.com>,
Thierry Reding <thierry.reding@...il.com>,
Paul Walmsley <pwalmsley@...dia.com>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-tegra@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH 1/5] clk: tegra: Add support for PLLSS
Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
---
drivers/clk/tegra/clk-pll.c | 168 +++++++++++++++++++++++++++++++++++++++++++
drivers/clk/tegra/clk.h | 7 ++
2 files changed, 175 insertions(+), 0 deletions(-)
diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
index 4cb2cec..87f0533 100644
--- a/drivers/clk/tegra/clk-pll.c
+++ b/drivers/clk/tegra/clk-pll.c
@@ -121,6 +121,33 @@
#define PMC_SATA_PWRGT_PLLE_IDDQ_VALUE BIT(5)
#define PMC_SATA_PWRGT_PLLE_IDDQ_SWCTL BIT(4)
+#define PLLSS_MISC_KCP 0
+#define PLLSS_MISC_KVCO 0
+#define PLLSS_MISC_SETUP 0
+#define PLLSS_EN_SDM 0
+#define PLLSS_EN_SSC 0
+#define PLLSS_EN_DITHER2 0
+#define PLLSS_EN_DITHER 1
+#define PLLSS_SDM_RESET 0
+#define PLLSS_CLAMP 0
+#define PLLSS_SDM_SSC_MAX 0
+#define PLLSS_SDM_SSC_MIN 0
+#define PLLSS_SDM_SSC_STEP 0
+#define PLLSS_SDM_DIN 0
+#define PLLSS_MISC_DEFAULT ((PLLSS_MISC_KCP << 25) | \
+ (PLLSS_MISC_KVCO << 24) | \
+ PLLSS_MISC_SETUP)
+#define PLLSS_CFG_DEFAULT ((PLLSS_EN_SDM << 31) | \
+ (PLLSS_EN_SSC << 30) | \
+ (PLLSS_EN_DITHER2 << 29) | \
+ (PLLSS_EN_DITHER << 28) | \
+ (PLLSS_SDM_RESET) << 27 | \
+ (PLLSS_CLAMP << 22))
+#define PLLSS_CTRL1_DEFAULT \
+ ((PLLSS_SDM_SSC_MAX << 16) | PLLSS_SDM_SSC_MIN)
+#define PLLSS_CTRL2_DEFAULT \
+ ((PLLSS_SDM_SSC_STEP << 16) | PLLSS_SDM_DIN)
+
#define pll_readl(offset, p) readl_relaxed(p->clk_base + offset)
#define pll_readl_base(p) pll_readl(p->params->base_reg, p)
#define pll_readl_misc(p) pll_readl(p->params->misc_reg, p)
@@ -1289,6 +1316,51 @@ static void clk_plle_tegra114_disable(struct clk_hw *hw)
}
#endif
+static int clk_pllss_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct tegra_clk_pll *pll = to_clk_pll(hw);
+ struct tegra_clk_pll_freq_table cfg, old_cfg;
+ unsigned long flags = 0;
+ int ret = 0;
+
+ ret = _pll_ramp_calc_pll(hw, &cfg, rate, parent_rate);
+ if (ret < 0)
+ return ret;
+
+ if (pll->lock)
+ spin_lock_irqsave(pll->lock, flags);
+
+ _get_pll_mnp(pll, &old_cfg);
+
+ if (old_cfg.m != cfg.m || old_cfg.n != cfg.n || old_cfg.p != cfg.p) {
+ u32 val;
+ int state = clk_pll_is_enabled(hw);
+
+ if (state) {
+ val = pll_readl_base(pll);
+ val &= ~PLL_BASE_ENABLE;
+ pll_writel_base(val, pll);
+ udelay(1);
+ }
+
+ _update_pll_mnp(pll, &cfg);
+
+ if (state) {
+ val = pll_readl_base(pll);
+ val |= PLL_BASE_ENABLE;
+ pll_writel_base(val, pll);
+ udelay(2);
+ clk_pll_wait_for_lock(pll);
+ }
+ }
+
+ if (pll->lock)
+ spin_unlock_irqrestore(pll->lock, flags);
+
+ return ret;
+}
+
static struct tegra_clk_pll *_tegra_init_pll(void __iomem *clk_base,
void __iomem *pmc, unsigned long fixed_rate,
struct tegra_clk_pll_params *pll_params, u32 pll_flags,
@@ -1690,3 +1762,99 @@ struct clk *tegra_clk_register_plle_tegra114(const char *name,
return clk;
}
#endif
+
+const struct clk_ops tegra_clk_pllss_ops = {
+ .is_enabled = clk_pll_is_enabled,
+ .enable = clk_pll_iddq_enable,
+ .disable = clk_pll_iddq_disable,
+ .recalc_rate = clk_pll_recalc_rate,
+ .round_rate = clk_pll_ramp_round_rate,
+ .set_rate = clk_pllss_set_rate,
+};
+
+struct clk *tegra_clk_register_pllss(const char *name, const char *parent_name,
+ void __iomem *clk_base, unsigned long flags,
+ unsigned long fixed_rate,
+ struct tegra_clk_pll_params *pll_params,
+ struct tegra_clk_pll_freq_table *freq_table,
+ spinlock_t *lock)
+{
+ struct tegra_clk_pll *pll;
+ struct clk *clk, *parent;
+ struct tegra_clk_pll_freq_table cfg;
+ unsigned long parent_rate;
+ u32 val, pll_flags;
+ int i;
+
+ if (!pll_params->div_nmp)
+ return ERR_PTR(-EINVAL);
+
+ parent = __clk_lookup(parent_name);
+ if (IS_ERR(parent)) {
+ WARN(1, "parent clk %s of %s must be registered first\n",
+ name, parent_name);
+ return ERR_PTR(-EINVAL);
+ }
+
+ pll_flags = TEGRA_PLL_HAS_LOCK_ENABLE | TEGRA_PLL_USE_LOCK;
+ pll = _tegra_init_pll(clk_base, NULL, fixed_rate, pll_params,
+ pll_flags, freq_table, lock);
+
+ if (IS_ERR(pll))
+ return ERR_CAST(pll);
+
+ val = pll_readl_base(pll);
+
+ if (val & (3 << 25)) {
+ WARN(1, "Unknown parent selected for %s: %d\n", name,
+ val >> 25);
+ kfree(pll);
+ return ERR_PTR(-EINVAL);
+ }
+ _get_pll_mnp(pll, &cfg);
+
+ if (cfg.n > 1) {
+ WARN(1, "%s should not be initialized\n", name);
+ kfree(pll);
+ return ERR_PTR(-EINVAL);
+ }
+
+ parent_rate = __clk_get_rate(parent);
+
+ pll_params->vco_min = _clip_vco_min(pll_params->vco_min, parent_rate);
+
+ cfg.m = _pll_fixed_mdiv(pll_params, parent_rate);
+ cfg.n = cfg.m * pll_params->vco_min / parent_rate;
+
+ for (i = 0; pll_params->pdiv_tohw[i].pdiv; i++)
+ ;
+ cfg.p = pll_params->pdiv_tohw[i-1].hw_val;
+
+ _update_pll_mnp(pll, &cfg);
+
+ pll_writel_misc(PLLSS_MISC_DEFAULT, pll);
+ pll_writel(PLLSS_CFG_DEFAULT, pll_params->ext_misc_reg[0], pll);
+ pll_writel(PLLSS_CTRL1_DEFAULT, pll_params->ext_misc_reg[1], pll);
+ pll_writel(PLLSS_CTRL1_DEFAULT, pll_params->ext_misc_reg[2], pll);
+
+ val = pll_readl_base(pll);
+ if (val & PLL_BASE_ENABLE) {
+ if (val & BIT(pll_params->iddq_bit_idx)) {
+ WARN(1, "%s is on but IDDQ set\n", name);
+ kfree(pll);
+ return ERR_PTR(-EINVAL);
+ }
+ } else
+ val |= BIT(pll_params->iddq_bit_idx);
+
+ val &= ~BIT(24); /* disable lock override */
+ pll_writel_base(val, pll);
+
+ clk = _tegra_clk_register_pll(pll, name, parent_name, flags,
+ &tegra_clk_pllss_ops);
+
+ if (IS_ERR(clk))
+ kfree(pll);
+
+ return clk;
+}
diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
index 153d857..2912f57 100644
--- a/drivers/clk/tegra/clk.h
+++ b/drivers/clk/tegra/clk.h
@@ -310,6 +310,13 @@ struct clk *tegra_clk_register_plle_tegra114(const char *name,
struct tegra_clk_pll_freq_table *freq_table,
spinlock_t *lock);
+struct clk *tegra_clk_register_pllss(const char *name, const char *parent_name,
+ void __iomem *clk_base, unsigned long flags,
+ unsigned long fixed_rate,
+ struct tegra_clk_pll_params *pll_params,
+ struct tegra_clk_pll_freq_table *freq_table,
+ spinlock_t *lock);
+
/**
* struct tegra_clk_pll_out - PLL divider down clock
*
--
1.7.7.rc0.72.g4b5ea.dirty
--
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