ARM: imx: add common clock support for pllv3

This PLL is found on i.MX6 SoCs

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

3 files changed, 433 insertions, 1 deletions

diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index 0c0e5c4673b1..66bc6bed0bcd 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -11,7 +11,7 @@ obj-$(CONFIG_SOC_IMX35) += mm-imx3.o cpu-imx35.o clock-imx35.o ehci-imx35.o pm-i
 
 obj-$(CONFIG_SOC_IMX5) += cpu-imx5.o mm-imx5.o clock-mx51-mx53.o ehci-imx5.o pm-imx5.o cpu_op-mx51.o
 
-obj-$(CONFIG_COMMON_CLK) += clk-pllv1.o clk-pllv2.o
+obj-$(CONFIG_COMMON_CLK) += clk-pllv1.o clk-pllv2.o clk-pllv3.o
 
 # Support for CMOS sensor interface
 obj-$(CONFIG_MX1_VIDEO) += mx1-camera-fiq.o mx1-camera-fiq-ksym.o
diff --git a/arch/arm/mach-imx/clk-pllv3.c b/arch/arm/mach-imx/clk-pllv3.c
new file mode 100644
index 000000000000..36aac947bce1
--- /dev/null
+++ b/arch/arm/mach-imx/clk-pllv3.c
@@ -0,0 +1,419 @@
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ * Copyright 2012 Linaro Ltd.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/err.h>
+#include "clk.h"
+
+#define PLL_NUM_OFFSET          0x10
+#define PLL_DENOM_OFFSET        0x20
+
+#define BM_PLL_POWER            (0x1 << 12)
+#define BM_PLL_ENABLE           (0x1 << 13)
+#define BM_PLL_BYPASS           (0x1 << 16)
+#define BM_PLL_LOCK             (0x1 << 31)
+
+/**
+ * struct clk_pllv3 - IMX PLL clock version 3
+ * @clk_hw:      clock source
+ * @base:        base address of PLL registers
+ * @powerup_set: set POWER bit to power up the PLL
+ * @gate_mask:   mask of gate bits
+ * @div_mask:    mask of divider bits
+ *
+ * IMX PLL clock version 3, found on i.MX6 series.  Divider for pllv3
+ * is actually a multiplier, and always sits at bit 0.
+ */
+struct clk_pllv3 {
+        struct clk_hw   hw;
+        void __iomem    *base;
+        bool            powerup_set;
+        u32             gate_mask;
+        u32             div_mask;
+};
+
+#define to_clk_pllv3(_hw) container_of(_hw, struct clk_pllv3, hw)
+
+static int clk_pllv3_prepare(struct clk_hw *hw)
+{
+        struct clk_pllv3 *pll = to_clk_pllv3(hw);
+        unsigned long timeout = jiffies + msecs_to_jiffies(10);
+        u32 val;
+
+        val = readl_relaxed(pll->base);
+        val &= ~BM_PLL_BYPASS;
+        if (pll->powerup_set)
+                val |= BM_PLL_POWER;
+        else
+                val &= ~BM_PLL_POWER;
+        writel_relaxed(val, pll->base);
+
+        /* Wait for PLL to lock */
+        while (!(readl_relaxed(pll->base) & BM_PLL_LOCK))
+                if (time_after(jiffies, timeout))
+                        return -ETIMEDOUT;
+
+        return 0;
+}
+
+static void clk_pllv3_unprepare(struct clk_hw *hw)
+{
+        struct clk_pllv3 *pll = to_clk_pllv3(hw);
+        u32 val;
+
+        val = readl_relaxed(pll->base);
+        val |= BM_PLL_BYPASS;
+        if (pll->powerup_set)
+                val &= ~BM_PLL_POWER;
+        else
+                val |= BM_PLL_POWER;
+        writel_relaxed(val, pll->base);
+}
+
+static int clk_pllv3_enable(struct clk_hw *hw)
+{
+        struct clk_pllv3 *pll = to_clk_pllv3(hw);
+        u32 val;
+
+        val = readl_relaxed(pll->base);
+        val |= pll->gate_mask;
+        writel_relaxed(val, pll->base);
+
+        return 0;
+}
+
+static void clk_pllv3_disable(struct clk_hw *hw)
+{
+        struct clk_pllv3 *pll = to_clk_pllv3(hw);
+        u32 val;
+
+        val = readl_relaxed(pll->base);
+        val &= ~pll->gate_mask;
+        writel_relaxed(val, pll->base);
+}
+
+static unsigned long clk_pllv3_recalc_rate(struct clk_hw *hw,
+                                           unsigned long parent_rate)
+{
+        struct clk_pllv3 *pll = to_clk_pllv3(hw);
+        u32 div = readl_relaxed(pll->base)  & pll->div_mask;
+
+        return (div == 1) ? parent_rate * 22 : parent_rate * 20;
+}
+
+static long clk_pllv3_round_rate(struct clk_hw *hw, unsigned long rate,
+                                 unsigned long *prate)
+{
+        unsigned long parent_rate = *prate;
+
+        return (rate >= parent_rate * 22) ? parent_rate * 22 :
+                                            parent_rate * 20;
+}
+
+static int clk_pllv3_set_rate(struct clk_hw *hw, unsigned long rate,
+                unsigned long parent_rate)
+{
+        struct clk_pllv3 *pll = to_clk_pllv3(hw);
+        u32 val, div;
+
+        if (rate == parent_rate * 22)
+                div = 1;
+        else if (rate == parent_rate * 20)
+                div = 0;
+        else
+                return -EINVAL;
+
+        val = readl_relaxed(pll->base);
+        val &= ~pll->div_mask;
+        val |= div;
+        writel_relaxed(val, pll->base);
+
+        return 0;
+}
+
+static const struct clk_ops clk_pllv3_ops = {
+        .prepare        = clk_pllv3_prepare,
+        .unprepare      = clk_pllv3_unprepare,
+        .enable         = clk_pllv3_enable,
+        .disable        = clk_pllv3_disable,
+        .recalc_rate    = clk_pllv3_recalc_rate,
+        .round_rate     = clk_pllv3_round_rate,
+        .set_rate       = clk_pllv3_set_rate,
+};
+
+static unsigned long clk_pllv3_sys_recalc_rate(struct clk_hw *hw,
+                                               unsigned long parent_rate)
+{
+        struct clk_pllv3 *pll = to_clk_pllv3(hw);
+        u32 div = readl_relaxed(pll->base) & pll->div_mask;
+
+        return parent_rate * div / 2;
+}
+
+static long clk_pllv3_sys_round_rate(struct clk_hw *hw, unsigned long rate,
+                                     unsigned long *prate)
+{
+        unsigned long parent_rate = *prate;
+        unsigned long min_rate = parent_rate * 54 / 2;
+        unsigned long max_rate = parent_rate * 108 / 2;
+        u32 div;
+
+        if (rate > max_rate)
+                rate = max_rate;
+        else if (rate < min_rate)
+                rate = min_rate;
+        div = rate * 2 / parent_rate;
+
+        return parent_rate * div / 2;
+}
+
+static int clk_pllv3_sys_set_rate(struct clk_hw *hw, unsigned long rate,
+                unsigned long parent_rate)
+{
+        struct clk_pllv3 *pll = to_clk_pllv3(hw);
+        unsigned long min_rate = parent_rate * 54 / 2;
+        unsigned long max_rate = parent_rate * 108 / 2;
+        u32 val, div;
+
+        if (rate < min_rate || rate > max_rate)
+                return -EINVAL;
+
+        div = rate * 2 / parent_rate;
+        val = readl_relaxed(pll->base);
+        val &= ~pll->div_mask;
+        val |= div;
+        writel_relaxed(val, pll->base);
+
+        return 0;
+}
+
+static const struct clk_ops clk_pllv3_sys_ops = {
+        .prepare        = clk_pllv3_prepare,
+        .unprepare      = clk_pllv3_unprepare,
+        .enable         = clk_pllv3_enable,
+        .disable        = clk_pllv3_disable,
+        .recalc_rate    = clk_pllv3_sys_recalc_rate,
+        .round_rate     = clk_pllv3_sys_round_rate,
+        .set_rate       = clk_pllv3_sys_set_rate,
+};
+
+static unsigned long clk_pllv3_av_recalc_rate(struct clk_hw *hw,
+                                              unsigned long parent_rate)
+{
+        struct clk_pllv3 *pll = to_clk_pllv3(hw);
+        u32 mfn = readl_relaxed(pll->base + PLL_NUM_OFFSET);
+        u32 mfd = readl_relaxed(pll->base + PLL_DENOM_OFFSET);
+        u32 div = readl_relaxed(pll->base) & pll->div_mask;
+
+        return (parent_rate * div) + ((parent_rate / mfd) * mfn);
+}
+
+static long clk_pllv3_av_round_rate(struct clk_hw *hw, unsigned long rate,
+                                    unsigned long *prate)
+{
+        unsigned long parent_rate = *prate;
+        unsigned long min_rate = parent_rate * 27;
+        unsigned long max_rate = parent_rate * 54;
+        u32 div;
+        u32 mfn, mfd = 1000000;
+        s64 temp64;
+
+        if (rate > max_rate)
+                rate = max_rate;
+        else if (rate < min_rate)
+                rate = min_rate;
+
+        div = rate / parent_rate;
+        temp64 = (u64) (rate - div * parent_rate);
+        temp64 *= mfd;
+        do_div(temp64, parent_rate);
+        mfn = temp64;
+
+        return parent_rate * div + parent_rate / mfd * mfn;
+}
+
+static int clk_pllv3_av_set_rate(struct clk_hw *hw, unsigned long rate,
+                unsigned long parent_rate)
+{
+        struct clk_pllv3 *pll = to_clk_pllv3(hw);
+        unsigned long min_rate = parent_rate * 27;
+        unsigned long max_rate = parent_rate * 54;
+        u32 val, div;
+        u32 mfn, mfd = 1000000;
+        s64 temp64;
+
+        if (rate < min_rate || rate > max_rate)
+                return -EINVAL;
+
+        div = rate / parent_rate;
+        temp64 = (u64) (rate - div * parent_rate);
+        temp64 *= mfd;
+        do_div(temp64, parent_rate);
+        mfn = temp64;
+
+        val = readl_relaxed(pll->base);
+        val &= ~pll->div_mask;
+        val |= div;
+        writel_relaxed(val, pll->base);
+        writel_relaxed(mfn, pll->base + PLL_NUM_OFFSET);
+        writel_relaxed(mfd, pll->base + PLL_DENOM_OFFSET);
+
+        return 0;
+}
+
+static const struct clk_ops clk_pllv3_av_ops = {
+        .prepare        = clk_pllv3_prepare,
+        .unprepare      = clk_pllv3_unprepare,
+        .enable         = clk_pllv3_enable,
+        .disable        = clk_pllv3_disable,
+        .recalc_rate    = clk_pllv3_av_recalc_rate,
+        .round_rate     = clk_pllv3_av_round_rate,
+        .set_rate       = clk_pllv3_av_set_rate,
+};
+
+static unsigned long clk_pllv3_enet_recalc_rate(struct clk_hw *hw,
+                                                unsigned long parent_rate)
+{
+        struct clk_pllv3 *pll = to_clk_pllv3(hw);
+        u32 div = readl_relaxed(pll->base) & pll->div_mask;
+
+        switch (div) {
+        case 0:
+                return 25000000;
+        case 1:
+                return 50000000;
+        case 2:
+                return 100000000;
+        case 3:
+                return 125000000;
+        }
+
+        return 0;
+}
+
+static long clk_pllv3_enet_round_rate(struct clk_hw *hw, unsigned long rate,
+                                      unsigned long *prate)
+{
+        if (rate >= 125000000)
+                rate = 125000000;
+        else if (rate >= 100000000)
+                rate = 100000000;
+        else if (rate >= 50000000)
+                rate = 50000000;
+        else
+                rate = 25000000;
+        return rate;
+}
+
+static int clk_pllv3_enet_set_rate(struct clk_hw *hw, unsigned long rate,
+                unsigned long parent_rate)
+{
+        struct clk_pllv3 *pll = to_clk_pllv3(hw);
+        u32 val, div;
+
+        switch (rate) {
+        case 25000000:
+                div = 0;
+                break;
+        case 50000000:
+                div = 1;
+                break;
+        case 100000000:
+                div = 2;
+                break;
+        case 125000000:
+                div = 3;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        val = readl_relaxed(pll->base);
+        val &= ~pll->div_mask;
+        val |= div;
+        writel_relaxed(val, pll->base);
+
+        return 0;
+}
+
+static const struct clk_ops clk_pllv3_enet_ops = {
+        .prepare        = clk_pllv3_prepare,
+        .unprepare      = clk_pllv3_unprepare,
+        .enable         = clk_pllv3_enable,
+        .disable        = clk_pllv3_disable,
+        .recalc_rate    = clk_pllv3_enet_recalc_rate,
+        .round_rate     = clk_pllv3_enet_round_rate,
+        .set_rate       = clk_pllv3_enet_set_rate,
+};
+
+static const struct clk_ops clk_pllv3_mlb_ops = {
+        .prepare        = clk_pllv3_prepare,
+        .unprepare      = clk_pllv3_unprepare,
+        .enable         = clk_pllv3_enable,
+        .disable        = clk_pllv3_disable,
+};
+
+struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name,
+                          const char *parent_name, void __iomem *base,
+                          u32 gate_mask, u32 div_mask)
+{
+        struct clk_pllv3 *pll;
+        const struct clk_ops *ops;
+        struct clk *clk;
+        struct clk_init_data init;
+
+        pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+        if (!pll)
+                return ERR_PTR(-ENOMEM);
+
+        switch (type) {
+        case IMX_PLLV3_SYS:
+                ops = &clk_pllv3_sys_ops;
+                break;
+        case IMX_PLLV3_USB:
+                ops = &clk_pllv3_ops;
+                pll->powerup_set = true;
+                break;
+        case IMX_PLLV3_AV:
+                ops = &clk_pllv3_av_ops;
+                break;
+        case IMX_PLLV3_ENET:
+                ops = &clk_pllv3_enet_ops;
+                break;
+        case IMX_PLLV3_MLB:
+                ops = &clk_pllv3_mlb_ops;
+                break;
+        default:
+                ops = &clk_pllv3_ops;
+        }
+        pll->base = base;
+        pll->gate_mask = gate_mask;
+        pll->div_mask = div_mask;
+
+        init.name = name;
+        init.ops = ops;
+        init.flags = 0;
+        init.parent_names = &parent_name;
+        init.num_parents = 1;
+
+        pll->hw.init = &init;
+
+        clk = clk_register(NULL, &pll->hw);
+        if (IS_ERR(clk))
+                kfree(pll);
+
+        return clk;
+}
diff --git a/arch/arm/mach-imx/clk.h b/arch/arm/mach-imx/clk.h
index 7f5da75f30b3..331316d6a4de 100644
--- a/arch/arm/mach-imx/clk.h
+++ b/arch/arm/mach-imx/clk.h
@@ -11,6 +11,19 @@ struct clk *imx_clk_pllv1(const char *name, const char *parent,
 struct clk *imx_clk_pllv2(const char *name, const char *parent,
                 void __iomem *base);
 
+enum imx_pllv3_type {
+        IMX_PLLV3_GENERIC,
+        IMX_PLLV3_SYS,
+        IMX_PLLV3_USB,
+        IMX_PLLV3_AV,
+        IMX_PLLV3_ENET,
+        IMX_PLLV3_MLB,
+};
+
+struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name,
+                const char *parent_name, void __iomem *base, u32 gate_mask,
+                u32 div_mask);
+
 static inline struct clk *imx_clk_fixed(const char *name, int rate)
 {
         return clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT, rate);