clk: samsung: add plls used by the early s3c24xx cpus

The manuals do not give them explicit names like in later socs, so more
generic names with a s3c2410-prefix were used for them.

As it was common to do so in the previous implementation, functionality
to change the pll rate is already included.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Mike Turquette <mturquette@linaro.org>
Acked-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

2 files changed, 185 insertions, 0 deletions

diff --git a/drivers/clk/samsung/clk-pll.c b/drivers/clk/samsung/clk-pll.c
index 8c9c015a4538..7fb0a28e65d5 100644
--- a/drivers/clk/samsung/clk-pll.c
+++ b/drivers/clk/samsung/clk-pll.c
@@ -11,6 +11,7 @@
 
 #include <linux/errno.h>
 #include <linux/hrtimer.h>
+#include <linux/delay.h>
 #include "clk.h"
 #include "clk-pll.h"
 
@@ -701,6 +702,169 @@ static const struct clk_ops samsung_pll6553_clk_ops = {
 };
 
 /*
+ * PLL Clock Type of S3C24XX before S3C2443
+ */
+
+#define PLLS3C2410_MDIV_MASK            (0xff)
+#define PLLS3C2410_PDIV_MASK            (0x1f)
+#define PLLS3C2410_SDIV_MASK            (0x3)
+#define PLLS3C2410_MDIV_SHIFT           (12)
+#define PLLS3C2410_PDIV_SHIFT           (4)
+#define PLLS3C2410_SDIV_SHIFT           (0)
+
+#define PLLS3C2410_ENABLE_REG_OFFSET    0x10
+
+static unsigned long samsung_s3c2410_pll_recalc_rate(struct clk_hw *hw,
+                                        unsigned long parent_rate)
+{
+        struct samsung_clk_pll *pll = to_clk_pll(hw);
+        u32 pll_con, mdiv, pdiv, sdiv;
+        u64 fvco = parent_rate;
+
+        pll_con = __raw_readl(pll->con_reg);
+        mdiv = (pll_con >> PLLS3C2410_MDIV_SHIFT) & PLLS3C2410_MDIV_MASK;
+        pdiv = (pll_con >> PLLS3C2410_PDIV_SHIFT) & PLLS3C2410_PDIV_MASK;
+        sdiv = (pll_con >> PLLS3C2410_SDIV_SHIFT) & PLLS3C2410_SDIV_MASK;
+
+        fvco *= (mdiv + 8);
+        do_div(fvco, (pdiv + 2) << sdiv);
+
+        return (unsigned int)fvco;
+}
+
+static unsigned long samsung_s3c2440_mpll_recalc_rate(struct clk_hw *hw,
+                                        unsigned long parent_rate)
+{
+        struct samsung_clk_pll *pll = to_clk_pll(hw);
+        u32 pll_con, mdiv, pdiv, sdiv;
+        u64 fvco = parent_rate;
+
+        pll_con = __raw_readl(pll->con_reg);
+        mdiv = (pll_con >> PLLS3C2410_MDIV_SHIFT) & PLLS3C2410_MDIV_MASK;
+        pdiv = (pll_con >> PLLS3C2410_PDIV_SHIFT) & PLLS3C2410_PDIV_MASK;
+        sdiv = (pll_con >> PLLS3C2410_SDIV_SHIFT) & PLLS3C2410_SDIV_MASK;
+
+        fvco *= (2 * (mdiv + 8));
+        do_div(fvco, (pdiv + 2) << sdiv);
+
+        return (unsigned int)fvco;
+}
+
+static int samsung_s3c2410_pll_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 tmp;
+
+        /* 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_get_name(hw->clk));
+                return -EINVAL;
+        }
+
+        tmp = __raw_readl(pll->con_reg);
+
+        /* Change PLL PMS values */
+        tmp &= ~((PLLS3C2410_MDIV_MASK << PLLS3C2410_MDIV_SHIFT) |
+                        (PLLS3C2410_PDIV_MASK << PLLS3C2410_PDIV_SHIFT) |
+                        (PLLS3C2410_SDIV_MASK << PLLS3C2410_SDIV_SHIFT));
+        tmp |= (rate->mdiv << PLLS3C2410_MDIV_SHIFT) |
+                        (rate->pdiv << PLLS3C2410_PDIV_SHIFT) |
+                        (rate->sdiv << PLLS3C2410_SDIV_SHIFT);
+        __raw_writel(tmp, pll->con_reg);
+
+        /* Time to settle according to the manual */
+        udelay(300);
+
+        return 0;
+}
+
+static int samsung_s3c2410_pll_enable(struct clk_hw *hw, int bit, bool enable)
+{
+        struct samsung_clk_pll *pll = to_clk_pll(hw);
+        u32 pll_en = __raw_readl(pll->lock_reg + PLLS3C2410_ENABLE_REG_OFFSET);
+        u32 pll_en_orig = pll_en;
+
+        if (enable)
+                pll_en &= ~BIT(bit);
+        else
+                pll_en |= BIT(bit);
+
+        __raw_writel(pll_en, pll->lock_reg + PLLS3C2410_ENABLE_REG_OFFSET);
+
+        /* if we started the UPLL, then allow to settle */
+        if (enable && (pll_en_orig & BIT(bit)))
+                udelay(300);
+
+        return 0;
+}
+
+static int samsung_s3c2410_mpll_enable(struct clk_hw *hw)
+{
+        return samsung_s3c2410_pll_enable(hw, 5, true);
+}
+
+static void samsung_s3c2410_mpll_disable(struct clk_hw *hw)
+{
+        samsung_s3c2410_pll_enable(hw, 5, false);
+}
+
+static int samsung_s3c2410_upll_enable(struct clk_hw *hw)
+{
+        return samsung_s3c2410_pll_enable(hw, 7, true);
+}
+
+static void samsung_s3c2410_upll_disable(struct clk_hw *hw)
+{
+        samsung_s3c2410_pll_enable(hw, 7, false);
+}
+
+static const struct clk_ops samsung_s3c2410_mpll_clk_min_ops = {
+        .recalc_rate = samsung_s3c2410_pll_recalc_rate,
+        .enable = samsung_s3c2410_mpll_enable,
+        .disable = samsung_s3c2410_mpll_disable,
+};
+
+static const struct clk_ops samsung_s3c2410_upll_clk_min_ops = {
+        .recalc_rate = samsung_s3c2410_pll_recalc_rate,
+        .enable = samsung_s3c2410_upll_enable,
+        .disable = samsung_s3c2410_upll_disable,
+};
+
+static const struct clk_ops samsung_s3c2440_mpll_clk_min_ops = {
+        .recalc_rate = samsung_s3c2440_mpll_recalc_rate,
+        .enable = samsung_s3c2410_mpll_enable,
+        .disable = samsung_s3c2410_mpll_disable,
+};
+
+static const struct clk_ops samsung_s3c2410_mpll_clk_ops = {
+        .recalc_rate = samsung_s3c2410_pll_recalc_rate,
+        .enable = samsung_s3c2410_mpll_enable,
+        .disable = samsung_s3c2410_mpll_disable,
+        .round_rate = samsung_pll_round_rate,
+        .set_rate = samsung_s3c2410_pll_set_rate,
+};
+
+static const struct clk_ops samsung_s3c2410_upll_clk_ops = {
+        .recalc_rate = samsung_s3c2410_pll_recalc_rate,
+        .enable = samsung_s3c2410_upll_enable,
+        .disable = samsung_s3c2410_upll_disable,
+        .round_rate = samsung_pll_round_rate,
+        .set_rate = samsung_s3c2410_pll_set_rate,
+};
+
+static const struct clk_ops samsung_s3c2440_mpll_clk_ops = {
+        .recalc_rate = samsung_s3c2440_mpll_recalc_rate,
+        .enable = samsung_s3c2410_mpll_enable,
+        .disable = samsung_s3c2410_mpll_disable,
+        .round_rate = samsung_pll_round_rate,
+        .set_rate = samsung_s3c2410_pll_set_rate,
+};
+
+/*
  * PLL2550x Clock Type
  */
 
@@ -866,6 +1030,24 @@ static void __init _samsung_clk_register_pll(struct samsung_pll_clock *pll_clk,
                 else
                         init.ops = &samsung_pll46xx_clk_ops;
                 break;
+        case pll_s3c2410_mpll:
+                if (!pll->rate_table)
+                        init.ops = &samsung_s3c2410_mpll_clk_min_ops;
+                else
+                        init.ops = &samsung_s3c2410_mpll_clk_ops;
+                break;
+        case pll_s3c2410_upll:
+                if (!pll->rate_table)
+                        init.ops = &samsung_s3c2410_upll_clk_min_ops;
+                else
+                        init.ops = &samsung_s3c2410_upll_clk_ops;
+                break;
+        case pll_s3c2440_mpll:
+                if (!pll->rate_table)
+                        init.ops = &samsung_s3c2440_mpll_clk_min_ops;
+                else
+                        init.ops = &samsung_s3c2440_mpll_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 5b64bdbb0906..6428bcc6df6f 100644
--- a/drivers/clk/samsung/clk-pll.h
+++ b/drivers/clk/samsung/clk-pll.h
@@ -28,6 +28,9 @@ enum samsung_pll_type {
         pll_6552,
         pll_6552_s3c2416,
         pll_6553,
+        pll_s3c2410_mpll,
+        pll_s3c2410_upll,
+        pll_s3c2440_mpll,
 };
 
 #define PLL_35XX_RATE(_rate, _m, _p, _s)                        \