[PATCH v2 3/4] clk: samsung: clk-pll: Add support for pll_531x

Sunyeal Hong
2024-07-07T23:14:59Z

pll531x PLL is used in Exynos Auto v920 SoC for shared pll.
pll531x: Integer/fractional PLL with mid frequency FVCO (800 to 3120 MHz)

PLL531x
FOUT = (MDIV + F/2^32-F[31]) * FIN/(PDIV x 2^SDIV)

Signed-off-by: Sunyeal Hong <sunyeal.hong@samsung.com>
---
drivers/clk/samsung/clk-pll.c | 45 +++++++++++++++++++++++++++++++++++
drivers/clk/samsung/clk-pll.h | 1 +
2 files changed, 46 insertions(+)

diff --git a/drivers/clk/samsung/clk-pll.c b/drivers/clk/samsung/clk-pll.c
index 4be879ab917e..b3bcef074ab7 100644
--- a/drivers/clk/samsung/clk-pll.c
+++ b/drivers/clk/samsung/clk-pll.c
@@ -1261,6 +1261,48 @@ static const struct clk_ops samsung_pll2650xx_clk_min_ops = {
.recalc_rate = samsung_pll2650xx_recalc_rate,
};

+/*
+ * PLL531X Clock Type
+ */
+/* Maximum lock time can be 500 * PDIV cycles */
+#define PLL531X_LOCK_FACTOR (500)
+#define PLL531X_MDIV_MASK (0x3FF)
+#define PLL531X_PDIV_MASK (0x3F)
+#define PLL531X_SDIV_MASK (0x7)
+#define PLL531X_FDIV_MASK (0xFFFF)
+#define PLL531X_MDIV_SHIFT (16)
+#define PLL531X_PDIV_SHIFT (8)
+#define PLL531X_SDIV_SHIFT (0)
+
+static unsigned long samsung_pll531x_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct samsung_clk_pll *pll = to_clk_pll(hw);
+ u32 mdiv, pdiv, sdiv, pll_con0, pll_con8;
+ s32 fdiv;
+ u64 fout = parent_rate;
+
+ pll_con0 = readl_relaxed(pll->con_reg);
+ pll_con8 = readl_relaxed(pll->con_reg + 20);
+ mdiv = (pll_con0 >> PLL531X_MDIV_SHIFT) & PLL531X_MDIV_MASK;
+ pdiv = (pll_con0 >> PLL531X_PDIV_SHIFT) & PLL531X_PDIV_MASK;
+ sdiv = (pll_con0 >> PLL531X_SDIV_SHIFT) & PLL531X_SDIV_MASK;
+ fdiv = (s32)(pll_con8 & PLL531X_FDIV_MASK);
+
+ if (fdiv >> 31)
+ mdiv--;
+
+ fout *= ((u64)mdiv << 24) + (fdiv >> 8);
+ do_div(fout, (pdiv << sdiv));
+ fout >>= 24;
+
+ return (unsigned long)fout;
+}
+
+static const struct clk_ops samsung_pll531x_clk_ops = {
+ .recalc_rate = samsung_pll531x_recalc_rate,
+};
+
static void __init _samsung_clk_register_pll(struct samsung_clk_provider *ctx,
const struct samsung_pll_clock *pll_clk)
{
@@ -1394,6 +1436,9 @@ static void __init _samsung_clk_register_pll(struct samsung_clk_provider *ctx,
else
init.ops = &samsung_pll2650xx_clk_ops;
break;
+ case pll_531x:
+ init.ops = &samsung_pll531x_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 ffd3d52c0dec..ce9d6f21f993 100644
--- a/drivers/clk/samsung/clk-pll.h
+++ b/drivers/clk/samsung/clk-pll.h
@@ -41,6 +41,7 @@ enum samsung_pll_type {
pll_0516x,
pll_0517x,
pll_0518x,
+ pll_531x,
};

#define PLL_RATE(_fin, _m, _p, _s, _k, _ks) \
--
2.45.2