clk/samsung: add support for pll2650xx

Add support for pll2650xx in samsung pll file. This PLL variant
is close to pll36xx but uses CON2 registers instead of CON1.

Aud_pll in Exynos5260 is pll2650xx and uses this code.

Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com>
Reviewed-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Signed-off-by: Tomasz Figa <t.figa@samsung.com>

2 files changed, 102 insertions, 0 deletions

diff --git a/drivers/clk/samsung/clk-pll.c b/drivers/clk/samsung/clk-pll.c
index 18e42ef56ea6..b07fad2a9167 100644
--- a/drivers/clk/samsung/clk-pll.c
+++ b/drivers/clk/samsung/clk-pll.c
@@ -1049,6 +1049,101 @@ static const struct clk_ops samsung_pll2550xx_clk_min_ops = {
         .recalc_rate = samsung_pll2550xx_recalc_rate,
 };
 
+/*
+ * PLL2650XX Clock Type
+ */
+
+/* Maximum lock time can be 3000 * PDIV cycles */
+#define PLL2650XX_LOCK_FACTOR 3000
+
+#define PLL2650XX_MDIV_SHIFT            9
+#define PLL2650XX_PDIV_SHIFT            3
+#define PLL2650XX_SDIV_SHIFT            0
+#define PLL2650XX_KDIV_SHIFT            0
+#define PLL2650XX_MDIV_MASK             0x1ff
+#define PLL2650XX_PDIV_MASK             0x3f
+#define PLL2650XX_SDIV_MASK             0x7
+#define PLL2650XX_KDIV_MASK             0xffff
+#define PLL2650XX_PLL_ENABLE_SHIFT      23
+#define PLL2650XX_PLL_LOCKTIME_SHIFT    21
+#define PLL2650XX_PLL_FOUTMASK_SHIFT    31
+
+static unsigned long samsung_pll2650xx_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_con2;
+        s16 kdiv;
+        u64 fvco = parent_rate;
+
+        pll_con0 = __raw_readl(pll->con_reg);
+        pll_con2 = __raw_readl(pll->con_reg + 8);
+        mdiv = (pll_con0 >> PLL2650XX_MDIV_SHIFT) & PLL2650XX_MDIV_MASK;
+        pdiv = (pll_con0 >> PLL2650XX_PDIV_SHIFT) & PLL2650XX_PDIV_MASK;
+        sdiv = (pll_con0 >> PLL2650XX_SDIV_SHIFT) & PLL2650XX_SDIV_MASK;
+        kdiv = (s16)(pll_con2 & PLL2650XX_KDIV_MASK);
+
+        fvco *= (mdiv << 16) + kdiv;
+        do_div(fvco, (pdiv << sdiv));
+        fvco >>= 16;
+
+        return (unsigned long)fvco;
+}
+
+static int samsung_pll2650xx_set_rate(struct clk_hw *hw, unsigned long drate,
+                                        unsigned long parent_rate)
+{
+        struct samsung_clk_pll *pll = to_clk_pll(hw);
+        u32 tmp, pll_con0, pll_con2;
+        const struct samsung_pll_rate_table *rate;
+
+        rate = samsung_get_pll_settings(pll, drate);
+        if (!rate) {
+                pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,
+                        drate, __clk_get_name(hw->clk));
+                return -EINVAL;
+        }
+
+        pll_con0 = __raw_readl(pll->con_reg);
+        pll_con2 = __raw_readl(pll->con_reg + 8);
+
+         /* Change PLL PMS values */
+        pll_con0 &= ~(PLL2650XX_MDIV_MASK << PLL2650XX_MDIV_SHIFT |
+                        PLL2650XX_PDIV_MASK << PLL2650XX_PDIV_SHIFT |
+                        PLL2650XX_SDIV_MASK << PLL2650XX_SDIV_SHIFT);
+        pll_con0 |= rate->mdiv << PLL2650XX_MDIV_SHIFT;
+        pll_con0 |= rate->pdiv << PLL2650XX_PDIV_SHIFT;
+        pll_con0 |= rate->sdiv << PLL2650XX_SDIV_SHIFT;
+        pll_con0 |= 1 << PLL2650XX_PLL_ENABLE_SHIFT;
+        pll_con0 |= 1 << PLL2650XX_PLL_FOUTMASK_SHIFT;
+
+        pll_con2 &= ~(PLL2650XX_KDIV_MASK << PLL2650XX_KDIV_SHIFT);
+        pll_con2 |= ((~(rate->kdiv) + 1) & PLL2650XX_KDIV_MASK)
+                        << PLL2650XX_KDIV_SHIFT;
+
+        /* Set PLL lock time. */
+        __raw_writel(PLL2650XX_LOCK_FACTOR * rate->pdiv, pll->lock_reg);
+
+        __raw_writel(pll_con0, pll->con_reg);
+        __raw_writel(pll_con2, pll->con_reg + 8);
+
+        do {
+                tmp = __raw_readl(pll->con_reg);
+        } while (!(tmp & (0x1 << PLL2650XX_PLL_LOCKTIME_SHIFT)));
+
+        return 0;
+}
+
+static const struct clk_ops samsung_pll2650xx_clk_ops = {
+        .recalc_rate = samsung_pll2650xx_recalc_rate,
+        .set_rate = samsung_pll2650xx_set_rate,
+        .round_rate = samsung_pll_round_rate,
+};
+
+static const struct clk_ops samsung_pll2650xx_clk_min_ops = {
+        .recalc_rate = samsung_pll2650xx_recalc_rate,
+};
+
 static void __init _samsung_clk_register_pll(struct samsung_clk_provider *ctx,
                                 struct samsung_pll_clock *pll_clk,
                                 void __iomem *base)
@@ -1157,6 +1252,12 @@ static void __init _samsung_clk_register_pll(struct samsung_clk_provider *ctx,
                 else
                         init.ops = &samsung_pll2550xx_clk_ops;
                 break;
+        case pll_2650xx:
+                if (!pll->rate_table)
+                        init.ops = &samsung_pll2650xx_clk_min_ops;
+                else
+                        init.ops = &samsung_pll2650xx_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 ec4bc1d45e31..c0ed4d41fd90 100644
--- a/drivers/clk/samsung/clk-pll.h
+++ b/drivers/clk/samsung/clk-pll.h
@@ -32,6 +32,7 @@ enum samsung_pll_type {
         pll_s3c2410_upll,
         pll_s3c2440_mpll,
         pll_2550xx,
+        pll_2650xx,
 };
 
 #define PLL_35XX_RATE(_rate, _m, _p, _s)                        \