[PATCH v2 02/10] clk: samsung: Add clock PLL support for ARTPEC-8 SoC

[Ravi Patel <ravi.patel@samsung.com>]

From: Hakyeong Kim <hgkim05@coasia.com>

Add below clock PLL support for Axis ARTPEC-8 SoC platform:
- pll_1017x: Integer PLL with mid frequency FVCO (950 to 2400 MHz)
             This is used in ARTPEC-8 SoC for shared PLL

- pll_1031x: Integer/Fractional PLL with mid frequency FVCO
             (600 to 1200 MHz)
             This is used in ARTPEC-8 SoC for Audio PLL

FOUT calculation for pll_1017x and pll_1031x:
FOUT = (MDIV x FIN)/(PDIV x 2^SDIV) for integer PLL
FOUT = (((MDIV + KDIV)/65536) x FIN)/(PDIV x 2^SDIV) for fractional PLL

Signed-off-by: Hakyeong Kim <hgkim05@coasia.com>
Signed-off-by: SeonGu Kang <ksk4725@coasia.com>
Signed-off-by: Ravi Patel <ravi.patel@samsung.com>
---
 drivers/clk/samsung/clk-pll.c | 128 +++++++++++++++++++++++++++++++++-
 drivers/clk/samsung/clk-pll.h |   2 +
 2 files changed, 129 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/samsung/clk-pll.c b/drivers/clk/samsung/clk-pll.c
index fe8abe442c51..614063396e23 100644
--- a/drivers/clk/samsung/clk-pll.c
+++ b/drivers/clk/samsung/clk-pll.c
@@ -273,7 +273,7 @@ static int samsung_pll35xx_set_rate(struct clk_hw *hw, unsigned long drate,
 	}
 
 	/* Set PLL lock time. */
-	if (pll->type == pll_142xx)
+	if (pll->type == pll_142xx || pll->type == pll_1017x)
 		writel_relaxed(rate->pdiv * PLL142XX_LOCK_FACTOR,
 			pll->lock_reg);
 	else
@@ -1325,6 +1325,125 @@ static const struct clk_ops samsung_pll531x_clk_ops = {
 	.recalc_rate = samsung_pll531x_recalc_rate,
 };
 
+/*
+ * PLL1031x Clock Type
+ */
+#define PLL1031X_LOCK_FACTOR	(500)
+
+#define PLL1031X_MDIV_MASK	(0x3ff)
+#define PLL1031X_PDIV_MASK	(0x3f)
+#define PLL1031X_SDIV_MASK	(0x7)
+#define PLL1031X_MDIV_SHIFT	(16)
+#define PLL1031X_PDIV_SHIFT	(8)
+#define PLL1031X_SDIV_SHIFT	(0)
+
+#define PLL1031X_KDIV_MASK	(0xffff)
+#define PLL1031X_KDIV_SHIFT	(0)
+#define PLL1031X_MFR_MASK	(0x3f)
+#define PLL1031X_MRR_MASK	(0x1f)
+#define PLL1031X_MFR_SHIFT	(16)
+#define PLL1031X_MRR_SHIFT	(24)
+
+static unsigned long samsung_pll1031x_recalc_rate(struct clk_hw *hw,
+						  unsigned long parent_rate)
+{
+	struct samsung_clk_pll *pll = to_clk_pll(hw);
+	u32 mdiv, pdiv, sdiv, kdiv, pll_con0, pll_con3;
+	u64 fvco = parent_rate;
+
+	pll_con0 = readl_relaxed(pll->con_reg);
+	pll_con3 = readl_relaxed(pll->con_reg + 0xc);
+	mdiv = (pll_con0 >> PLL1031X_MDIV_SHIFT) & PLL1031X_MDIV_MASK;
+	pdiv = (pll_con0 >> PLL1031X_PDIV_SHIFT) & PLL1031X_PDIV_MASK;
+	sdiv = (pll_con0 >> PLL1031X_SDIV_SHIFT) & PLL1031X_SDIV_MASK;
+	kdiv = (pll_con3 & PLL1031X_KDIV_MASK);
+
+	fvco *= (mdiv << PLL1031X_MDIV_SHIFT) + kdiv;
+	do_div(fvco, (pdiv << sdiv));
+	fvco >>= PLL1031X_MDIV_SHIFT;
+
+	return (unsigned long)fvco;
+}
+
+static bool samsung_pll1031x_mpk_change(u32 pll_con0, u32 pll_con3,
+					const struct samsung_pll_rate_table *rate)
+{
+	u32 old_mdiv, old_pdiv, old_kdiv;
+
+	old_mdiv = (pll_con0 >> PLL1031X_MDIV_SHIFT) & PLL1031X_MDIV_MASK;
+	old_pdiv = (pll_con0 >> PLL1031X_PDIV_SHIFT) & PLL1031X_PDIV_MASK;
+	old_kdiv = (pll_con3 >> PLL1031X_KDIV_SHIFT) & PLL1031X_KDIV_MASK;
+
+	return (old_mdiv != rate->mdiv || old_pdiv != rate->pdiv ||
+		old_kdiv != rate->kdiv);
+}
+
+static int samsung_pll1031x_set_rate(struct clk_hw *hw, unsigned long drate,
+				     unsigned long prate)
+{
+	struct samsung_clk_pll *pll = to_clk_pll(hw);
+	const struct samsung_pll_rate_table *rate;
+	u32 con0, con3;
+
+	/* Get required rate settings from table */
+	rate = samsung_get_pll_settings(pll, drate);
+	if (!rate) {
+		pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,
+		       drate, clk_hw_get_name(hw));
+		return -EINVAL;
+	}
+
+	con0 = readl_relaxed(pll->con_reg);
+	con3 = readl_relaxed(pll->con_reg + 0xc);
+
+	if (!(samsung_pll1031x_mpk_change(con0, con3, rate))) {
+		/* If only s change, change just s value only */
+		con0 &= ~(PLL1031X_SDIV_MASK << PLL1031X_SDIV_SHIFT);
+		con0 |= rate->sdiv << PLL1031X_SDIV_SHIFT;
+		writel_relaxed(con0, pll->con_reg);
+
+		return 0;
+	}
+
+	/* Set PLL lock time. */
+	writel_relaxed(rate->pdiv * PLL1031X_LOCK_FACTOR, pll->lock_reg);
+
+	/* Set PLL M, P, and S values. */
+	con0 &= ~((PLL1031X_MDIV_MASK << PLL1031X_MDIV_SHIFT) |
+		  (PLL1031X_PDIV_MASK << PLL1031X_PDIV_SHIFT) |
+		  (PLL1031X_SDIV_MASK << PLL1031X_SDIV_SHIFT));
+
+	con0 |= (rate->mdiv << PLL1031X_MDIV_SHIFT) |
+		(rate->pdiv << PLL1031X_PDIV_SHIFT) |
+		(rate->sdiv << PLL1031X_SDIV_SHIFT);
+
+	/* Set PLL K, MFR and MRR values. */
+	con3 = readl_relaxed(pll->con_reg + 0xc);
+	con3 &= ~((PLL1031X_KDIV_MASK << PLL1031X_KDIV_SHIFT) |
+		  (PLL1031X_MFR_MASK << PLL1031X_MFR_SHIFT) |
+		  (PLL1031X_MRR_MASK << PLL1031X_MRR_SHIFT));
+	con3 |= (rate->kdiv << PLL1031X_KDIV_SHIFT) |
+		(rate->mfr << PLL1031X_MFR_SHIFT) |
+		(rate->mrr << PLL1031X_MRR_SHIFT);
+
+	/* Write configuration to PLL */
+	writel_relaxed(con0, pll->con_reg);
+	writel_relaxed(con3, pll->con_reg + 0xc);
+
+	/* Wait for PLL lock if the PLL is enabled */
+	return samsung_pll_lock_wait(pll, BIT(pll->lock_offs));
+}
+
+static const struct clk_ops samsung_pll1031x_clk_ops = {
+	.recalc_rate = samsung_pll1031x_recalc_rate,
+	.round_rate = samsung_pll_round_rate,
+	.set_rate = samsung_pll1031x_set_rate,
+};
+
+static const struct clk_ops samsung_pll1031x_clk_min_ops = {
+	.recalc_rate = samsung_pll1031x_recalc_rate,
+};
+
 static void __init _samsung_clk_register_pll(struct samsung_clk_provider *ctx,
 				const struct samsung_pll_clock *pll_clk)
 {
@@ -1373,6 +1492,7 @@ static void __init _samsung_clk_register_pll(struct samsung_clk_provider *ctx,
 	case pll_1451x:
 	case pll_1452x:
 	case pll_142xx:
+	case pll_1017x:
 		pll->enable_offs = PLL35XX_ENABLE_SHIFT;
 		pll->lock_offs = PLL35XX_LOCK_STAT_SHIFT;
 		if (!pll->rate_table)
@@ -1468,6 +1588,12 @@ static void __init _samsung_clk_register_pll(struct samsung_clk_provider *ctx,
 	case pll_4311:
 		init.ops = &samsung_pll531x_clk_ops;
 		break;
+	case pll_1031x:
+		if (!pll->rate_table)
+			init.ops = &samsung_pll1031x_clk_min_ops;
+		else
+			init.ops = &samsung_pll1031x_clk_ops;
+		break;
 	default:
 		pr_warn("%s: Unknown pll type for pll clk %s\n",
 			__func__, pll_clk->name);
diff --git a/drivers/clk/samsung/clk-pll.h b/drivers/clk/samsung/clk-pll.h
index e9a5f8e0e0a3..6c8bb7f26da5 100644
--- a/drivers/clk/samsung/clk-pll.h
+++ b/drivers/clk/samsung/clk-pll.h
@@ -49,6 +49,8 @@ enum samsung_pll_type {
 	pll_0718x,
 	pll_0732x,
 	pll_4311,
+	pll_1017x,
+	pll_1031x,
 };
 
 #define PLL_RATE(_fin, _m, _p, _s, _k, _ks) \
-- 
2.49.0