1 files changed, 1555 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/tegra20_clocks.c b/arch/arm/mach-tegra/tegra20_clocks.c
new file mode 100644
index 000000000000..840ab262272a
--- /dev/null
+++ b/arch/arm/mach-tegra/tegra20_clocks.c
@@ -0,0 +1,1555 @@
+/*
+ * arch/arm/mach-tegra/tegra20_clocks.c
+ *
+ * Copyright (C) 2010 Google, Inc.
+ * Copyright (c) 2010-2012 NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Author:
+ *      Colin Cross <ccross@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/clkdev.h>
+#include <linux/clk.h>
+
+#include <mach/iomap.h>
+#include <mach/suspend.h>
+
+#include "clock.h"
+#include "fuse.h"
+#include "tegra2_emc.h"
+
+#define RST_DEVICES                     0x004
+#define RST_DEVICES_SET                 0x300
+#define RST_DEVICES_CLR                 0x304
+#define RST_DEVICES_NUM                 3
+
+#define CLK_OUT_ENB                     0x010
+#define CLK_OUT_ENB_SET                 0x320
+#define CLK_OUT_ENB_CLR                 0x324
+#define CLK_OUT_ENB_NUM                 3
+
+#define CLK_MASK_ARM                    0x44
+#define MISC_CLK_ENB                    0x48
+
+#define OSC_CTRL                        0x50
+#define OSC_CTRL_OSC_FREQ_MASK          (3<<30)
+#define OSC_CTRL_OSC_FREQ_13MHZ         (0<<30)
+#define OSC_CTRL_OSC_FREQ_19_2MHZ       (1<<30)
+#define OSC_CTRL_OSC_FREQ_12MHZ         (2<<30)
+#define OSC_CTRL_OSC_FREQ_26MHZ         (3<<30)
+#define OSC_CTRL_MASK                   (0x3f2 | OSC_CTRL_OSC_FREQ_MASK)
+
+#define OSC_FREQ_DET                    0x58
+#define OSC_FREQ_DET_TRIG               (1<<31)
+
+#define OSC_FREQ_DET_STATUS             0x5C
+#define OSC_FREQ_DET_BUSY               (1<<31)
+#define OSC_FREQ_DET_CNT_MASK           0xFFFF
+
+#define PERIPH_CLK_SOURCE_I2S1          0x100
+#define PERIPH_CLK_SOURCE_EMC           0x19c
+#define PERIPH_CLK_SOURCE_OSC           0x1fc
+#define PERIPH_CLK_SOURCE_NUM \
+        ((PERIPH_CLK_SOURCE_OSC - PERIPH_CLK_SOURCE_I2S1) / 4)
+
+#define PERIPH_CLK_SOURCE_MASK          (3<<30)
+#define PERIPH_CLK_SOURCE_SHIFT         30
+#define PERIPH_CLK_SOURCE_PWM_MASK      (7<<28)
+#define PERIPH_CLK_SOURCE_PWM_SHIFT     28
+#define PERIPH_CLK_SOURCE_ENABLE        (1<<28)
+#define PERIPH_CLK_SOURCE_DIVU71_MASK   0xFF
+#define PERIPH_CLK_SOURCE_DIVU16_MASK   0xFFFF
+#define PERIPH_CLK_SOURCE_DIV_SHIFT     0
+
+#define SDMMC_CLK_INT_FB_SEL            (1 << 23)
+#define SDMMC_CLK_INT_FB_DLY_SHIFT      16
+#define SDMMC_CLK_INT_FB_DLY_MASK       (0xF << SDMMC_CLK_INT_FB_DLY_SHIFT)
+
+#define PLL_BASE                        0x0
+#define PLL_BASE_BYPASS                 (1<<31)
+#define PLL_BASE_ENABLE                 (1<<30)
+#define PLL_BASE_REF_ENABLE             (1<<29)
+#define PLL_BASE_OVERRIDE               (1<<28)
+#define PLL_BASE_DIVP_MASK              (0x7<<20)
+#define PLL_BASE_DIVP_SHIFT             20
+#define PLL_BASE_DIVN_MASK              (0x3FF<<8)
+#define PLL_BASE_DIVN_SHIFT             8
+#define PLL_BASE_DIVM_MASK              (0x1F)
+#define PLL_BASE_DIVM_SHIFT             0
+
+#define PLL_OUT_RATIO_MASK              (0xFF<<8)
+#define PLL_OUT_RATIO_SHIFT             8
+#define PLL_OUT_OVERRIDE                (1<<2)
+#define PLL_OUT_CLKEN                   (1<<1)
+#define PLL_OUT_RESET_DISABLE           (1<<0)
+
+#define PLL_MISC(c) (((c)->flags & PLL_ALT_MISC_REG) ? 0x4 : 0xc)
+
+#define PLL_MISC_DCCON_SHIFT            20
+#define PLL_MISC_CPCON_SHIFT            8
+#define PLL_MISC_CPCON_MASK             (0xF<<PLL_MISC_CPCON_SHIFT)
+#define PLL_MISC_LFCON_SHIFT            4
+#define PLL_MISC_LFCON_MASK             (0xF<<PLL_MISC_LFCON_SHIFT)
+#define PLL_MISC_VCOCON_SHIFT           0
+#define PLL_MISC_VCOCON_MASK            (0xF<<PLL_MISC_VCOCON_SHIFT)
+
+#define PLLU_BASE_POST_DIV              (1<<20)
+
+#define PLLD_MISC_CLKENABLE             (1<<30)
+#define PLLD_MISC_DIV_RST               (1<<23)
+#define PLLD_MISC_DCCON_SHIFT           12
+
+#define PLLE_MISC_READY                 (1 << 15)
+
+#define PERIPH_CLK_TO_ENB_REG(c)        ((c->u.periph.clk_num / 32) * 4)
+#define PERIPH_CLK_TO_ENB_SET_REG(c)    ((c->u.periph.clk_num / 32) * 8)
+#define PERIPH_CLK_TO_ENB_BIT(c)        (1 << (c->u.periph.clk_num % 32))
+
+#define SUPER_CLK_MUX                   0x00
+#define SUPER_STATE_SHIFT               28
+#define SUPER_STATE_MASK                (0xF << SUPER_STATE_SHIFT)
+#define SUPER_STATE_STANDBY             (0x0 << SUPER_STATE_SHIFT)
+#define SUPER_STATE_IDLE                (0x1 << SUPER_STATE_SHIFT)
+#define SUPER_STATE_RUN                 (0x2 << SUPER_STATE_SHIFT)
+#define SUPER_STATE_IRQ                 (0x3 << SUPER_STATE_SHIFT)
+#define SUPER_STATE_FIQ                 (0x4 << SUPER_STATE_SHIFT)
+#define SUPER_SOURCE_MASK               0xF
+#define SUPER_FIQ_SOURCE_SHIFT          12
+#define SUPER_IRQ_SOURCE_SHIFT          8
+#define SUPER_RUN_SOURCE_SHIFT          4
+#define SUPER_IDLE_SOURCE_SHIFT         0
+
+#define SUPER_CLK_DIVIDER               0x04
+
+#define BUS_CLK_DISABLE                 (1<<3)
+#define BUS_CLK_DIV_MASK                0x3
+
+#define PMC_CTRL                        0x0
+ #define PMC_CTRL_BLINK_ENB             (1 << 7)
+
+#define PMC_DPD_PADS_ORIDE              0x1c
+ #define PMC_DPD_PADS_ORIDE_BLINK_ENB   (1 << 20)
+
+#define PMC_BLINK_TIMER_DATA_ON_SHIFT   0
+#define PMC_BLINK_TIMER_DATA_ON_MASK    0x7fff
+#define PMC_BLINK_TIMER_ENB             (1 << 15)
+#define PMC_BLINK_TIMER_DATA_OFF_SHIFT  16
+#define PMC_BLINK_TIMER_DATA_OFF_MASK   0xffff
+
+static void __iomem *reg_clk_base = IO_ADDRESS(TEGRA_CLK_RESET_BASE);
+static void __iomem *reg_pmc_base = IO_ADDRESS(TEGRA_PMC_BASE);
+
+/*
+ * Some clocks share a register with other clocks.  Any clock op that
+ * non-atomically modifies a register used by another clock must lock
+ * clock_register_lock first.
+ */
+static DEFINE_SPINLOCK(clock_register_lock);
+
+/*
+ * Some peripheral clocks share an enable bit, so refcount the enable bits
+ * in registers CLK_ENABLE_L, CLK_ENABLE_H, and CLK_ENABLE_U
+ */
+static int tegra_periph_clk_enable_refcount[3 * 32];
+
+#define clk_writel(value, reg) \
+        __raw_writel(value, reg_clk_base + (reg))
+#define clk_readl(reg) \
+        __raw_readl(reg_clk_base + (reg))
+#define pmc_writel(value, reg) \
+        __raw_writel(value, reg_pmc_base + (reg))
+#define pmc_readl(reg) \
+        __raw_readl(reg_pmc_base + (reg))
+
+static unsigned long clk_measure_input_freq(void)
+{
+        u32 clock_autodetect;
+        clk_writel(OSC_FREQ_DET_TRIG | 1, OSC_FREQ_DET);
+        do {} while (clk_readl(OSC_FREQ_DET_STATUS) & OSC_FREQ_DET_BUSY);
+        clock_autodetect = clk_readl(OSC_FREQ_DET_STATUS);
+        if (clock_autodetect >= 732 - 3 && clock_autodetect <= 732 + 3) {
+                return 12000000;
+        } else if (clock_autodetect >= 794 - 3 && clock_autodetect <= 794 + 3) {
+                return 13000000;
+        } else if (clock_autodetect >= 1172 - 3 && clock_autodetect <= 1172 + 3) {
+                return 19200000;
+        } else if (clock_autodetect >= 1587 - 3 && clock_autodetect <= 1587 + 3) {
+                return 26000000;
+        } else {
+                pr_err("%s: Unexpected clock autodetect value %d",
+                                                __func__, clock_autodetect);
+                BUG();
+                return 0;
+        }
+}
+
+static int clk_div71_get_divider(unsigned long parent_rate, unsigned long rate)
+{
+        s64 divider_u71 = parent_rate * 2;
+        divider_u71 += rate - 1;
+        do_div(divider_u71, rate);
+
+        if (divider_u71 - 2 < 0)
+                return 0;
+
+        if (divider_u71 - 2 > 255)
+                return -EINVAL;
+
+        return divider_u71 - 2;
+}
+
+static int clk_div16_get_divider(unsigned long parent_rate, unsigned long rate)
+{
+        s64 divider_u16;
+
+        divider_u16 = parent_rate;
+        divider_u16 += rate - 1;
+        do_div(divider_u16, rate);
+
+        if (divider_u16 - 1 < 0)
+                return 0;
+
+        if (divider_u16 - 1 > 0xFFFF)
+                return -EINVAL;
+
+        return divider_u16 - 1;
+}
+
+static unsigned long tegra_clk_fixed_recalc_rate(struct clk_hw *hw,
+                unsigned long parent_rate)
+{
+        return to_clk_tegra(hw)->fixed_rate;
+}
+
+struct clk_ops tegra_clk_32k_ops = {
+        .recalc_rate = tegra_clk_fixed_recalc_rate,
+};
+
+/* clk_m functions */
+static unsigned long tegra20_clk_m_recalc_rate(struct clk_hw *hw,
+                        unsigned long prate)
+{
+        if (!to_clk_tegra(hw)->fixed_rate)
+                to_clk_tegra(hw)->fixed_rate = clk_measure_input_freq();
+        return to_clk_tegra(hw)->fixed_rate;
+}
+
+static void tegra20_clk_m_init(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 osc_ctrl = clk_readl(OSC_CTRL);
+        u32 auto_clock_control = osc_ctrl & ~OSC_CTRL_OSC_FREQ_MASK;
+
+        switch (c->fixed_rate) {
+        case 12000000:
+                auto_clock_control |= OSC_CTRL_OSC_FREQ_12MHZ;
+                break;
+        case 13000000:
+                auto_clock_control |= OSC_CTRL_OSC_FREQ_13MHZ;
+                break;
+        case 19200000:
+                auto_clock_control |= OSC_CTRL_OSC_FREQ_19_2MHZ;
+                break;
+        case 26000000:
+                auto_clock_control |= OSC_CTRL_OSC_FREQ_26MHZ;
+                break;
+        default:
+                BUG();
+        }
+        clk_writel(auto_clock_control, OSC_CTRL);
+}
+
+struct clk_ops tegra_clk_m_ops = {
+        .init = tegra20_clk_m_init,
+        .recalc_rate = tegra20_clk_m_recalc_rate,
+};
+
+/* super clock functions */
+/* "super clocks" on tegra have two-stage muxes and a clock skipping
+ * super divider.  We will ignore the clock skipping divider, since we
+ * can't lower the voltage when using the clock skip, but we can if we
+ * lower the PLL frequency.
+ */
+static int tegra20_super_clk_is_enabled(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val;
+
+        val = clk_readl(c->reg + SUPER_CLK_MUX);
+        BUG_ON(((val & SUPER_STATE_MASK) != SUPER_STATE_RUN) &&
+                ((val & SUPER_STATE_MASK) != SUPER_STATE_IDLE));
+        c->state = ON;
+        return c->state;
+}
+
+static int tegra20_super_clk_enable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        clk_writel(0, c->reg + SUPER_CLK_DIVIDER);
+        return 0;
+}
+
+static void tegra20_super_clk_disable(struct clk_hw *hw)
+{
+        pr_debug("%s on clock %s\n", __func__, __clk_get_name(hw->clk));
+
+        /* oops - don't disable the CPU clock! */
+        BUG();
+}
+
+static u8 tegra20_super_clk_get_parent(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        int val = clk_readl(c->reg + SUPER_CLK_MUX);
+        int source;
+        int shift;
+
+        BUG_ON(((val & SUPER_STATE_MASK) != SUPER_STATE_RUN) &&
+                ((val & SUPER_STATE_MASK) != SUPER_STATE_IDLE));
+        shift = ((val & SUPER_STATE_MASK) == SUPER_STATE_IDLE) ?
+                SUPER_IDLE_SOURCE_SHIFT : SUPER_RUN_SOURCE_SHIFT;
+        source = (val >> shift) & SUPER_SOURCE_MASK;
+        return source;
+}
+
+static int tegra20_super_clk_set_parent(struct clk_hw *hw, u8 index)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val = clk_readl(c->reg + SUPER_CLK_MUX);
+        int shift;
+
+        BUG_ON(((val & SUPER_STATE_MASK) != SUPER_STATE_RUN) &&
+                ((val & SUPER_STATE_MASK) != SUPER_STATE_IDLE));
+        shift = ((val & SUPER_STATE_MASK) == SUPER_STATE_IDLE) ?
+                SUPER_IDLE_SOURCE_SHIFT : SUPER_RUN_SOURCE_SHIFT;
+        val &= ~(SUPER_SOURCE_MASK << shift);
+        val |= index << shift;
+
+        clk_writel(val, c->reg);
+
+        return 0;
+}
+
+/* FIX ME: Need to switch parents to change the source PLL rate */
+static unsigned long tegra20_super_clk_recalc_rate(struct clk_hw *hw,
+                        unsigned long prate)
+{
+        return prate;
+}
+
+static long tegra20_super_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+                                unsigned long *prate)
+{
+        return *prate;
+}
+
+static int tegra20_super_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+                unsigned long parent_rate)
+{
+        return 0;
+}
+
+struct clk_ops tegra_super_ops = {
+        .is_enabled = tegra20_super_clk_is_enabled,
+        .enable = tegra20_super_clk_enable,
+        .disable = tegra20_super_clk_disable,
+        .set_parent = tegra20_super_clk_set_parent,
+        .get_parent = tegra20_super_clk_get_parent,
+        .set_rate = tegra20_super_clk_set_rate,
+        .round_rate = tegra20_super_clk_round_rate,
+        .recalc_rate = tegra20_super_clk_recalc_rate,
+};
+
+static unsigned long tegra20_twd_clk_recalc_rate(struct clk_hw *hw,
+                unsigned long parent_rate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u64 rate = parent_rate;
+
+        if (c->mul != 0 && c->div != 0) {
+                rate *= c->mul;
+                rate += c->div - 1; /* round up */
+                do_div(rate, c->div);
+        }
+
+        return rate;
+}
+
+struct clk_ops tegra_twd_ops = {
+        .recalc_rate = tegra20_twd_clk_recalc_rate,
+};
+
+static u8 tegra20_cop_clk_get_parent(struct clk_hw *hw)
+{
+        return 0;
+}
+
+struct clk_ops tegra_cop_ops = {
+        .get_parent = tegra20_cop_clk_get_parent,
+};
+
+/* virtual cop clock functions. Used to acquire the fake 'cop' clock to
+ * reset the COP block (i.e. AVP) */
+void tegra2_cop_clk_reset(struct clk_hw *hw, bool assert)
+{
+        unsigned long reg = assert ? RST_DEVICES_SET : RST_DEVICES_CLR;
+
+        pr_debug("%s %s\n", __func__, assert ? "assert" : "deassert");
+        clk_writel(1 << 1, reg);
+}
+
+/* bus clock functions */
+static int tegra20_bus_clk_is_enabled(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val = clk_readl(c->reg);
+
+        c->state = ((val >> c->reg_shift) & BUS_CLK_DISABLE) ? OFF : ON;
+        return c->state;
+}
+
+static int tegra20_bus_clk_enable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        unsigned long flags;
+        u32 val;
+
+        spin_lock_irqsave(&clock_register_lock, flags);
+
+        val = clk_readl(c->reg);
+        val &= ~(BUS_CLK_DISABLE << c->reg_shift);
+        clk_writel(val, c->reg);
+
+        spin_unlock_irqrestore(&clock_register_lock, flags);
+
+        return 0;
+}
+
+static void tegra20_bus_clk_disable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        unsigned long flags;
+        u32 val;
+
+        spin_lock_irqsave(&clock_register_lock, flags);
+
+        val = clk_readl(c->reg);
+        val |= BUS_CLK_DISABLE << c->reg_shift;
+        clk_writel(val, c->reg);
+
+        spin_unlock_irqrestore(&clock_register_lock, flags);
+}
+
+static unsigned long tegra20_bus_clk_recalc_rate(struct clk_hw *hw,
+                        unsigned long prate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val = clk_readl(c->reg);
+        u64 rate = prate;
+
+        c->div = ((val >> c->reg_shift) & BUS_CLK_DIV_MASK) + 1;
+        c->mul = 1;
+
+        if (c->mul != 0 && c->div != 0) {
+                rate *= c->mul;
+                rate += c->div - 1; /* round up */
+                do_div(rate, c->div);
+        }
+        return rate;
+}
+
+static int tegra20_bus_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+                unsigned long parent_rate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        int ret = -EINVAL;
+        unsigned long flags;
+        u32 val;
+        int i;
+
+        spin_lock_irqsave(&clock_register_lock, flags);
+
+        val = clk_readl(c->reg);
+        for (i = 1; i <= 4; i++) {
+                if (rate == parent_rate / i) {
+                        val &= ~(BUS_CLK_DIV_MASK << c->reg_shift);
+                        val |= (i - 1) << c->reg_shift;
+                        clk_writel(val, c->reg);
+                        c->div = i;
+                        c->mul = 1;
+                        ret = 0;
+                        break;
+                }
+        }
+
+        spin_unlock_irqrestore(&clock_register_lock, flags);
+
+        return ret;
+}
+
+static long tegra20_bus_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+                                unsigned long *prate)
+{
+        unsigned long parent_rate = *prate;
+        s64 divider;
+
+        if (rate >= parent_rate)
+                return rate;
+
+        divider = parent_rate;
+        divider += rate - 1;
+        do_div(divider, rate);
+
+        if (divider < 0)
+                return divider;
+
+        if (divider > 4)
+                divider = 4;
+        do_div(parent_rate, divider);
+
+        return parent_rate;
+}
+
+struct clk_ops tegra_bus_ops = {
+        .is_enabled = tegra20_bus_clk_is_enabled,
+        .enable = tegra20_bus_clk_enable,
+        .disable = tegra20_bus_clk_disable,
+        .set_rate = tegra20_bus_clk_set_rate,
+        .round_rate = tegra20_bus_clk_round_rate,
+        .recalc_rate = tegra20_bus_clk_recalc_rate,
+};
+
+/* Blink output functions */
+static int tegra20_blink_clk_is_enabled(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val;
+
+        val = pmc_readl(PMC_CTRL);
+        c->state = (val & PMC_CTRL_BLINK_ENB) ? ON : OFF;
+        return c->state;
+}
+
+static unsigned long tegra20_blink_clk_recalc_rate(struct clk_hw *hw,
+                        unsigned long prate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u64 rate = prate;
+        u32 val;
+
+        c->mul = 1;
+        val = pmc_readl(c->reg);
+
+        if (val & PMC_BLINK_TIMER_ENB) {
+                unsigned int on_off;
+
+                on_off = (val >> PMC_BLINK_TIMER_DATA_ON_SHIFT) &
+                        PMC_BLINK_TIMER_DATA_ON_MASK;
+                val >>= PMC_BLINK_TIMER_DATA_OFF_SHIFT;
+                val &= PMC_BLINK_TIMER_DATA_OFF_MASK;
+                on_off += val;
+                /* each tick in the blink timer is 4 32KHz clocks */
+                c->div = on_off * 4;
+        } else {
+                c->div = 1;
+        }
+
+        if (c->mul != 0 && c->div != 0) {
+                rate *= c->mul;
+                rate += c->div - 1; /* round up */
+                do_div(rate, c->div);
+        }
+        return rate;
+}
+
+static int tegra20_blink_clk_enable(struct clk_hw *hw)
+{
+        u32 val;
+
+        val = pmc_readl(PMC_DPD_PADS_ORIDE);
+        pmc_writel(val | PMC_DPD_PADS_ORIDE_BLINK_ENB, PMC_DPD_PADS_ORIDE);
+
+        val = pmc_readl(PMC_CTRL);
+        pmc_writel(val | PMC_CTRL_BLINK_ENB, PMC_CTRL);
+
+        return 0;
+}
+
+static void tegra20_blink_clk_disable(struct clk_hw *hw)
+{
+        u32 val;
+
+        val = pmc_readl(PMC_CTRL);
+        pmc_writel(val & ~PMC_CTRL_BLINK_ENB, PMC_CTRL);
+
+        val = pmc_readl(PMC_DPD_PADS_ORIDE);
+        pmc_writel(val & ~PMC_DPD_PADS_ORIDE_BLINK_ENB, PMC_DPD_PADS_ORIDE);
+}
+
+static int tegra20_blink_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+                unsigned long parent_rate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+
+        if (rate >= parent_rate) {
+                c->div = 1;
+                pmc_writel(0, c->reg);
+        } else {
+                unsigned int on_off;
+                u32 val;
+
+                on_off = DIV_ROUND_UP(parent_rate / 8, rate);
+                c->div = on_off * 8;
+
+                val = (on_off & PMC_BLINK_TIMER_DATA_ON_MASK) <<
+                        PMC_BLINK_TIMER_DATA_ON_SHIFT;
+                on_off &= PMC_BLINK_TIMER_DATA_OFF_MASK;
+                on_off <<= PMC_BLINK_TIMER_DATA_OFF_SHIFT;
+                val |= on_off;
+                val |= PMC_BLINK_TIMER_ENB;
+                pmc_writel(val, c->reg);
+        }
+
+        return 0;
+}
+
+static long tegra20_blink_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+                                unsigned long *prate)
+{
+        int div;
+        int mul;
+        long round_rate = *prate;
+
+        mul = 1;
+
+        if (rate >= *prate) {
+                div = 1;
+        } else {
+                div = DIV_ROUND_UP(*prate / 8, rate);
+                div *= 8;
+        }
+
+        round_rate *= mul;
+        round_rate += div - 1;
+        do_div(round_rate, div);
+
+        return round_rate;
+}
+
+struct clk_ops tegra_blink_clk_ops = {
+        .is_enabled = tegra20_blink_clk_is_enabled,
+        .enable = tegra20_blink_clk_enable,
+        .disable = tegra20_blink_clk_disable,
+        .set_rate = tegra20_blink_clk_set_rate,
+        .round_rate = tegra20_blink_clk_round_rate,
+        .recalc_rate = tegra20_blink_clk_recalc_rate,
+};
+
+/* PLL Functions */
+static int tegra20_pll_clk_wait_for_lock(struct clk_tegra *c)
+{
+        udelay(c->u.pll.lock_delay);
+        return 0;
+}
+
+static int tegra20_pll_clk_is_enabled(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val = clk_readl(c->reg + PLL_BASE);
+
+        c->state = (val & PLL_BASE_ENABLE) ? ON : OFF;
+        return c->state;
+}
+
+static unsigned long tegra20_pll_clk_recalc_rate(struct clk_hw *hw,
+                                unsigned long prate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val = clk_readl(c->reg + PLL_BASE);
+        u64 rate = prate;
+
+        if (c->flags & PLL_FIXED && !(val & PLL_BASE_OVERRIDE)) {
+                const struct clk_pll_freq_table *sel;
+                for (sel = c->u.pll.freq_table; sel->input_rate != 0; sel++) {
+                        if (sel->input_rate == prate &&
+                                sel->output_rate == c->u.pll.fixed_rate) {
+                                c->mul = sel->n;
+                                c->div = sel->m * sel->p;
+                                break;
+                        }
+                }
+                pr_err("Clock %s has unknown fixed frequency\n",
+                        __clk_get_name(hw->clk));
+                BUG();
+        } else if (val & PLL_BASE_BYPASS) {
+                c->mul = 1;
+                c->div = 1;
+        } else {
+                c->mul = (val & PLL_BASE_DIVN_MASK) >> PLL_BASE_DIVN_SHIFT;
+                c->div = (val & PLL_BASE_DIVM_MASK) >> PLL_BASE_DIVM_SHIFT;
+                if (c->flags & PLLU)
+                        c->div *= (val & PLLU_BASE_POST_DIV) ? 1 : 2;
+                else
+                        c->div *= (val & PLL_BASE_DIVP_MASK) ? 2 : 1;
+        }
+
+        if (c->mul != 0 && c->div != 0) {
+                rate *= c->mul;
+                rate += c->div - 1; /* round up */
+                do_div(rate, c->div);
+        }
+        return rate;
+}
+
+static int tegra20_pll_clk_enable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val;
+        pr_debug("%s on clock %s\n", __func__, __clk_get_name(hw->clk));
+
+        val = clk_readl(c->reg + PLL_BASE);
+        val &= ~PLL_BASE_BYPASS;
+        val |= PLL_BASE_ENABLE;
+        clk_writel(val, c->reg + PLL_BASE);
+
+        tegra20_pll_clk_wait_for_lock(c);
+
+        return 0;
+}
+
+static void tegra20_pll_clk_disable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val;
+        pr_debug("%s on clock %s\n", __func__, __clk_get_name(hw->clk));
+
+        val = clk_readl(c->reg);
+        val &= ~(PLL_BASE_BYPASS | PLL_BASE_ENABLE);
+        clk_writel(val, c->reg);
+}
+
+static int tegra20_pll_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+                unsigned long parent_rate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        unsigned long input_rate = parent_rate;
+        const struct clk_pll_freq_table *sel;
+        u32 val;
+
+        pr_debug("%s: %s %lu\n", __func__, __clk_get_name(hw->clk), rate);
+
+        if (c->flags & PLL_FIXED) {
+                int ret = 0;
+                if (rate != c->u.pll.fixed_rate) {
+                        pr_err("%s: Can not change %s fixed rate %lu to %lu\n",
+                                __func__, __clk_get_name(hw->clk),
+                                c->u.pll.fixed_rate, rate);
+                        ret = -EINVAL;
+                }
+                return ret;
+        }
+
+        for (sel = c->u.pll.freq_table; sel->input_rate != 0; sel++) {
+                if (sel->input_rate == input_rate && sel->output_rate == rate) {
+                        c->mul = sel->n;
+                        c->div = sel->m * sel->p;
+
+                        val = clk_readl(c->reg + PLL_BASE);
+                        if (c->flags & PLL_FIXED)
+                                val |= PLL_BASE_OVERRIDE;
+                        val &= ~(PLL_BASE_DIVP_MASK | PLL_BASE_DIVN_MASK |
+                                 PLL_BASE_DIVM_MASK);
+                        val |= (sel->m << PLL_BASE_DIVM_SHIFT) |
+                                (sel->n << PLL_BASE_DIVN_SHIFT);
+                        BUG_ON(sel->p < 1 || sel->p > 2);
+                        if (c->flags & PLLU) {
+                                if (sel->p == 1)
+                                        val |= PLLU_BASE_POST_DIV;
+                        } else {
+                                if (sel->p == 2)
+                                        val |= 1 << PLL_BASE_DIVP_SHIFT;
+                        }
+                        clk_writel(val, c->reg + PLL_BASE);
+
+                        if (c->flags & PLL_HAS_CPCON) {
+                                val = clk_readl(c->reg + PLL_MISC(c));
+                                val &= ~PLL_MISC_CPCON_MASK;
+                                val |= sel->cpcon << PLL_MISC_CPCON_SHIFT;
+                                clk_writel(val, c->reg + PLL_MISC(c));
+                        }
+
+                        if (c->state == ON)
+                                tegra20_pll_clk_enable(hw);
+                        return 0;
+                }
+        }
+        return -EINVAL;
+}
+
+static long tegra20_pll_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+                                unsigned long *prate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        const struct clk_pll_freq_table *sel;
+        unsigned long input_rate = *prate;
+        u64 output_rate = *prate;
+        int mul;
+        int div;
+
+        if (c->flags & PLL_FIXED)
+                return c->u.pll.fixed_rate;
+
+        for (sel = c->u.pll.freq_table; sel->input_rate != 0; sel++)
+                if (sel->input_rate == input_rate && sel->output_rate == rate) {
+                        mul = sel->n;
+                        div = sel->m * sel->p;
+                        break;
+                }
+
+        if (sel->input_rate == 0)
+                return -EINVAL;
+
+        output_rate *= mul;
+        output_rate += div - 1; /* round up */
+        do_div(output_rate, div);
+
+        return output_rate;
+}
+
+struct clk_ops tegra_pll_ops = {
+        .is_enabled = tegra20_pll_clk_is_enabled,
+        .enable = tegra20_pll_clk_enable,
+        .disable = tegra20_pll_clk_disable,
+        .set_rate = tegra20_pll_clk_set_rate,
+        .recalc_rate = tegra20_pll_clk_recalc_rate,
+        .round_rate = tegra20_pll_clk_round_rate,
+};
+
+static void tegra20_pllx_clk_init(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+
+        if (tegra_sku_id == 7)
+                c->max_rate = 750000000;
+}
+
+struct clk_ops tegra_pllx_ops = {
+        .init = tegra20_pllx_clk_init,
+        .is_enabled = tegra20_pll_clk_is_enabled,
+        .enable = tegra20_pll_clk_enable,
+        .disable = tegra20_pll_clk_disable,
+        .set_rate = tegra20_pll_clk_set_rate,
+        .recalc_rate = tegra20_pll_clk_recalc_rate,
+        .round_rate = tegra20_pll_clk_round_rate,
+};
+
+static int tegra20_plle_clk_enable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val;
+
+        pr_debug("%s on clock %s\n", __func__, __clk_get_name(hw->clk));
+
+        mdelay(1);
+
+        val = clk_readl(c->reg + PLL_BASE);
+        if (!(val & PLLE_MISC_READY))
+                return -EBUSY;
+
+        val = clk_readl(c->reg + PLL_BASE);
+        val |= PLL_BASE_ENABLE | PLL_BASE_BYPASS;
+        clk_writel(val, c->reg + PLL_BASE);
+
+        return 0;
+}
+
+struct clk_ops tegra_plle_ops = {
+        .is_enabled = tegra20_pll_clk_is_enabled,
+        .enable = tegra20_plle_clk_enable,
+        .set_rate = tegra20_pll_clk_set_rate,
+        .recalc_rate = tegra20_pll_clk_recalc_rate,
+        .round_rate = tegra20_pll_clk_round_rate,
+};
+
+/* Clock divider ops */
+static int tegra20_pll_div_clk_is_enabled(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val = clk_readl(c->reg);
+
+        val >>= c->reg_shift;
+        c->state = (val & PLL_OUT_CLKEN) ? ON : OFF;
+        if (!(val & PLL_OUT_RESET_DISABLE))
+                c->state = OFF;
+        return c->state;
+}
+
+static unsigned long tegra20_pll_div_clk_recalc_rate(struct clk_hw *hw,
+                        unsigned long prate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u64 rate = prate;
+        u32 val = clk_readl(c->reg);
+        u32 divu71;
+
+        val >>= c->reg_shift;
+
+        if (c->flags & DIV_U71) {
+                divu71 = (val & PLL_OUT_RATIO_MASK) >> PLL_OUT_RATIO_SHIFT;
+                c->div = (divu71 + 2);
+                c->mul = 2;
+        } else if (c->flags & DIV_2) {
+                c->div = 2;
+                c->mul = 1;
+        } else {
+                c->div = 1;
+                c->mul = 1;
+        }
+
+        rate *= c->mul;
+        rate += c->div - 1; /* round up */
+        do_div(rate, c->div);
+
+        return rate;
+}
+
+static int tegra20_pll_div_clk_enable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        unsigned long flags;
+        u32 new_val;
+        u32 val;
+
+        pr_debug("%s: %s\n", __func__, __clk_get_name(hw->clk));
+
+        if (c->flags & DIV_U71) {
+                spin_lock_irqsave(&clock_register_lock, flags);
+                val = clk_readl(c->reg);
+                new_val = val >> c->reg_shift;
+                new_val &= 0xFFFF;
+
+                new_val |= PLL_OUT_CLKEN | PLL_OUT_RESET_DISABLE;
+
+                val &= ~(0xFFFF << c->reg_shift);
+                val |= new_val << c->reg_shift;
+                clk_writel(val, c->reg);
+                spin_unlock_irqrestore(&clock_register_lock, flags);
+                return 0;
+        } else if (c->flags & DIV_2) {
+                BUG_ON(!(c->flags & PLLD));
+                spin_lock_irqsave(&clock_register_lock, flags);
+                val = clk_readl(c->reg);
+                val &= ~PLLD_MISC_DIV_RST;
+                clk_writel(val, c->reg);
+                spin_unlock_irqrestore(&clock_register_lock, flags);
+                return 0;
+        }
+        return -EINVAL;
+}
+
+static void tegra20_pll_div_clk_disable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        unsigned long flags;
+        u32 new_val;
+        u32 val;
+
+        pr_debug("%s: %s\n", __func__, __clk_get_name(hw->clk));
+
+        if (c->flags & DIV_U71) {
+                spin_lock_irqsave(&clock_register_lock, flags);
+                val = clk_readl(c->reg);
+                new_val = val >> c->reg_shift;
+                new_val &= 0xFFFF;
+
+                new_val &= ~(PLL_OUT_CLKEN | PLL_OUT_RESET_DISABLE);
+
+                val &= ~(0xFFFF << c->reg_shift);
+                val |= new_val << c->reg_shift;
+                clk_writel(val, c->reg);
+                spin_unlock_irqrestore(&clock_register_lock, flags);
+        } else if (c->flags & DIV_2) {
+                BUG_ON(!(c->flags & PLLD));
+                spin_lock_irqsave(&clock_register_lock, flags);
+                val = clk_readl(c->reg);
+                val |= PLLD_MISC_DIV_RST;
+                clk_writel(val, c->reg);
+                spin_unlock_irqrestore(&clock_register_lock, flags);
+        }
+}
+
+static int tegra20_pll_div_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+                unsigned long parent_rate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        unsigned long flags;
+        int divider_u71;
+        u32 new_val;
+        u32 val;
+
+        pr_debug("%s: %s %lu\n", __func__, __clk_get_name(hw->clk), rate);
+
+        if (c->flags & DIV_U71) {
+                divider_u71 = clk_div71_get_divider(parent_rate, rate);
+                if (divider_u71 >= 0) {
+                        spin_lock_irqsave(&clock_register_lock, flags);
+                        val = clk_readl(c->reg);
+                        new_val = val >> c->reg_shift;
+                        new_val &= 0xFFFF;
+                        if (c->flags & DIV_U71_FIXED)
+                                new_val |= PLL_OUT_OVERRIDE;
+                        new_val &= ~PLL_OUT_RATIO_MASK;
+                        new_val |= divider_u71 << PLL_OUT_RATIO_SHIFT;
+
+                        val &= ~(0xFFFF << c->reg_shift);
+                        val |= new_val << c->reg_shift;
+                        clk_writel(val, c->reg);
+                        c->div = divider_u71 + 2;
+                        c->mul = 2;
+                        spin_unlock_irqrestore(&clock_register_lock, flags);
+                        return 0;
+                }
+        } else if (c->flags & DIV_2) {
+                if (parent_rate == rate * 2)
+                        return 0;
+        }
+        return -EINVAL;
+}
+
+static long tegra20_pll_div_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+                                unsigned long *prate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        unsigned long parent_rate = *prate;
+        int divider;
+
+        pr_debug("%s: %s %lu\n", __func__, __clk_get_name(hw->clk), rate);
+
+        if (c->flags & DIV_U71) {
+                divider = clk_div71_get_divider(parent_rate, rate);
+                if (divider < 0)
+                        return divider;
+                return DIV_ROUND_UP(parent_rate * 2, divider + 2);
+        } else if (c->flags & DIV_2) {
+                return DIV_ROUND_UP(parent_rate, 2);
+        }
+        return -EINVAL;
+}
+
+struct clk_ops tegra_pll_div_ops = {
+        .is_enabled = tegra20_pll_div_clk_is_enabled,
+        .enable = tegra20_pll_div_clk_enable,
+        .disable = tegra20_pll_div_clk_disable,
+        .set_rate = tegra20_pll_div_clk_set_rate,
+        .round_rate = tegra20_pll_div_clk_round_rate,
+        .recalc_rate = tegra20_pll_div_clk_recalc_rate,
+};
+
+/* Periph clk ops */
+
+static int tegra20_periph_clk_is_enabled(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+
+        c->state = ON;
+
+        if (!c->u.periph.clk_num)
+                goto out;
+
+        if (!(clk_readl(CLK_OUT_ENB + PERIPH_CLK_TO_ENB_REG(c)) &
+                        PERIPH_CLK_TO_ENB_BIT(c)))
+                c->state = OFF;
+
+        if (!(c->flags & PERIPH_NO_RESET))
+                if (clk_readl(RST_DEVICES + PERIPH_CLK_TO_ENB_REG(c)) &
+                                PERIPH_CLK_TO_ENB_BIT(c))
+                        c->state = OFF;
+
+out:
+        return c->state;
+}
+
+static int tegra20_periph_clk_enable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        unsigned long flags;
+        u32 val;
+
+        pr_debug("%s on clock %s\n", __func__, __clk_get_name(hw->clk));
+
+        if (!c->u.periph.clk_num)
+                return 0;
+
+        tegra_periph_clk_enable_refcount[c->u.periph.clk_num]++;
+        if (tegra_periph_clk_enable_refcount[c->u.periph.clk_num] > 1)
+                return 0;
+
+        spin_lock_irqsave(&clock_register_lock, flags);
+
+        clk_writel(PERIPH_CLK_TO_ENB_BIT(c),
+                CLK_OUT_ENB_SET + PERIPH_CLK_TO_ENB_SET_REG(c));
+        if (!(c->flags & PERIPH_NO_RESET) && !(c->flags & PERIPH_MANUAL_RESET))
+                clk_writel(PERIPH_CLK_TO_ENB_BIT(c),
+                        RST_DEVICES_CLR + PERIPH_CLK_TO_ENB_SET_REG(c));
+        if (c->flags & PERIPH_EMC_ENB) {
+                /* The EMC peripheral clock has 2 extra enable bits */
+                /* FIXME: Do they need to be disabled? */
+                val = clk_readl(c->reg);
+                val |= 0x3 << 24;
+                clk_writel(val, c->reg);
+        }
+
+        spin_unlock_irqrestore(&clock_register_lock, flags);
+
+        return 0;
+}
+
+static void tegra20_periph_clk_disable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        unsigned long flags;
+
+        pr_debug("%s on clock %s\n", __func__, __clk_get_name(hw->clk));
+
+        if (!c->u.periph.clk_num)
+                return;
+
+        tegra_periph_clk_enable_refcount[c->u.periph.clk_num]--;
+
+        if (tegra_periph_clk_enable_refcount[c->u.periph.clk_num] > 0)
+                return;
+
+        spin_lock_irqsave(&clock_register_lock, flags);
+
+        clk_writel(PERIPH_CLK_TO_ENB_BIT(c),
+                CLK_OUT_ENB_CLR + PERIPH_CLK_TO_ENB_SET_REG(c));
+
+        spin_unlock_irqrestore(&clock_register_lock, flags);
+}
+
+void tegra2_periph_clk_reset(struct clk_hw *hw, bool assert)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        unsigned long base = assert ? RST_DEVICES_SET : RST_DEVICES_CLR;
+
+        pr_debug("%s %s on clock %s\n", __func__,
+                assert ? "assert" : "deassert", __clk_get_name(hw->clk));
+
+        BUG_ON(!c->u.periph.clk_num);
+
+        if (!(c->flags & PERIPH_NO_RESET))
+                clk_writel(PERIPH_CLK_TO_ENB_BIT(c),
+                           base + PERIPH_CLK_TO_ENB_SET_REG(c));
+}
+
+static int tegra20_periph_clk_set_parent(struct clk_hw *hw, u8 index)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val;
+        u32 mask;
+        u32 shift;
+
+        pr_debug("%s: %s %d\n", __func__, __clk_get_name(hw->clk), index);
+
+        if (c->flags & MUX_PWM) {
+                shift = PERIPH_CLK_SOURCE_PWM_SHIFT;
+                mask = PERIPH_CLK_SOURCE_PWM_MASK;
+        } else {
+                shift = PERIPH_CLK_SOURCE_SHIFT;
+                mask = PERIPH_CLK_SOURCE_MASK;
+        }
+
+        val = clk_readl(c->reg);
+        val &= ~mask;
+        val |= (index) << shift;
+
+        clk_writel(val, c->reg);
+
+        return 0;
+}
+
+static u8 tegra20_periph_clk_get_parent(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val = clk_readl(c->reg);
+        u32 mask;
+        u32 shift;
+
+        if (c->flags & MUX_PWM) {
+                shift = PERIPH_CLK_SOURCE_PWM_SHIFT;
+                mask = PERIPH_CLK_SOURCE_PWM_MASK;
+        } else {
+                shift = PERIPH_CLK_SOURCE_SHIFT;
+                mask = PERIPH_CLK_SOURCE_MASK;
+        }
+
+        if (c->flags & MUX)
+                return (val & mask) >> shift;
+        else
+                return 0;
+}
+
+static unsigned long tegra20_periph_clk_recalc_rate(struct clk_hw *hw,
+                        unsigned long prate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        unsigned long rate = prate;
+        u32 val = clk_readl(c->reg);
+
+        if (c->flags & DIV_U71) {
+                u32 divu71 = val & PERIPH_CLK_SOURCE_DIVU71_MASK;
+                c->div = divu71 + 2;
+                c->mul = 2;
+        } else if (c->flags & DIV_U16) {
+                u32 divu16 = val & PERIPH_CLK_SOURCE_DIVU16_MASK;
+                c->div = divu16 + 1;
+                c->mul = 1;
+        } else {
+                c->div = 1;
+                c->mul = 1;
+                return rate;
+        }
+
+        if (c->mul != 0 && c->div != 0) {
+                rate *= c->mul;
+                rate += c->div - 1; /* round up */
+                do_div(rate, c->div);
+        }
+
+        return rate;
+}
+
+static int tegra20_periph_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+                unsigned long parent_rate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val;
+        int divider;
+
+        val = clk_readl(c->reg);
+
+        if (c->flags & DIV_U71) {
+                divider = clk_div71_get_divider(parent_rate, rate);
+
+                if (divider >= 0) {
+                        val = clk_readl(c->reg);
+                        val &= ~PERIPH_CLK_SOURCE_DIVU71_MASK;
+                        val |= divider;
+                        clk_writel(val, c->reg);
+                        c->div = divider + 2;
+                        c->mul = 2;
+                        return 0;
+                }
+        } else if (c->flags & DIV_U16) {
+                divider = clk_div16_get_divider(parent_rate, rate);
+                if (divider >= 0) {
+                        val = clk_readl(c->reg);
+                        val &= ~PERIPH_CLK_SOURCE_DIVU16_MASK;
+                        val |= divider;
+                        clk_writel(val, c->reg);
+                        c->div = divider + 1;
+                        c->mul = 1;
+                        return 0;
+                }
+        } else if (parent_rate <= rate) {
+                c->div = 1;
+                c->mul = 1;
+                return 0;
+        }
+
+        return -EINVAL;
+}
+
+static long tegra20_periph_clk_round_rate(struct clk_hw *hw,
+        unsigned long rate, unsigned long *prate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        unsigned long parent_rate = __clk_get_rate(__clk_get_parent(hw->clk));
+        int divider;
+
+        pr_debug("%s: %s %lu\n", __func__, __clk_get_name(hw->clk), rate);
+
+        if (prate)
+                parent_rate = *prate;
+
+        if (c->flags & DIV_U71) {
+                divider = clk_div71_get_divider(parent_rate, rate);
+                if (divider < 0)
+                        return divider;
+
+                return DIV_ROUND_UP(parent_rate * 2, divider + 2);
+        } else if (c->flags & DIV_U16) {
+                divider = clk_div16_get_divider(parent_rate, rate);
+                if (divider < 0)
+                        return divider;
+                return DIV_ROUND_UP(parent_rate, divider + 1);
+        }
+        return -EINVAL;
+}
+
+struct clk_ops tegra_periph_clk_ops = {
+        .is_enabled = tegra20_periph_clk_is_enabled,
+        .enable = tegra20_periph_clk_enable,
+        .disable = tegra20_periph_clk_disable,
+        .set_parent = tegra20_periph_clk_set_parent,
+        .get_parent = tegra20_periph_clk_get_parent,
+        .set_rate = tegra20_periph_clk_set_rate,
+        .round_rate = tegra20_periph_clk_round_rate,
+        .recalc_rate = tegra20_periph_clk_recalc_rate,
+};
+
+/* External memory controller clock ops */
+static void tegra20_emc_clk_init(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        c->max_rate = __clk_get_rate(hw->clk);
+}
+
+static long tegra20_emc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+                                unsigned long *prate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        long emc_rate;
+        long clk_rate;
+
+        /*
+         * The slowest entry in the EMC clock table that is at least as
+         * fast as rate.
+         */
+        emc_rate = tegra_emc_round_rate(rate);
+        if (emc_rate < 0)
+                return c->max_rate;
+
+        /*
+         * The fastest rate the PLL will generate that is at most the
+         * requested rate.
+         */
+        clk_rate = tegra20_periph_clk_round_rate(hw, emc_rate, NULL);
+
+        /*
+         * If this fails, and emc_rate > clk_rate, it's because the maximum
+         * rate in the EMC tables is larger than the maximum rate of the EMC
+         * clock. The EMC clock's max rate is the rate it was running when the
+         * kernel booted. Such a mismatch is probably due to using the wrong
+         * BCT, i.e. using a Tegra20 BCT with an EMC table written for Tegra25.
+         */
+        WARN_ONCE(emc_rate != clk_rate,
+                "emc_rate %ld != clk_rate %ld",
+                emc_rate, clk_rate);
+
+        return emc_rate;
+}
+
+static int tegra20_emc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+                unsigned long parent_rate)
+{
+        int ret;
+
+        /*
+         * The Tegra2 memory controller has an interlock with the clock
+         * block that allows memory shadowed registers to be updated,
+         * and then transfer them to the main registers at the same
+         * time as the clock update without glitches.
+         */
+        ret = tegra_emc_set_rate(rate);
+        if (ret < 0)
+                return ret;
+
+        ret = tegra20_periph_clk_set_rate(hw, rate, parent_rate);
+        udelay(1);
+
+        return ret;
+}
+
+struct clk_ops tegra_emc_clk_ops = {
+        .init = tegra20_emc_clk_init,
+        .is_enabled = tegra20_periph_clk_is_enabled,
+        .enable = tegra20_periph_clk_enable,
+        .disable = tegra20_periph_clk_disable,
+        .set_parent = tegra20_periph_clk_set_parent,
+        .get_parent = tegra20_periph_clk_get_parent,
+        .set_rate = tegra20_emc_clk_set_rate,
+        .round_rate = tegra20_emc_clk_round_rate,
+        .recalc_rate = tegra20_periph_clk_recalc_rate,
+};
+
+/* Clock doubler ops */
+static int tegra20_clk_double_is_enabled(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+
+        c->state = ON;
+
+        if (!c->u.periph.clk_num)
+                goto out;
+
+        if (!(clk_readl(CLK_OUT_ENB + PERIPH_CLK_TO_ENB_REG(c)) &
+                        PERIPH_CLK_TO_ENB_BIT(c)))
+                c->state = OFF;
+
+out:
+        return c->state;
+};
+
+static unsigned long tegra20_clk_double_recalc_rate(struct clk_hw *hw,
+                        unsigned long prate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u64 rate = prate;
+
+        c->mul = 2;
+        c->div = 1;
+
+        rate *= c->mul;
+        rate += c->div - 1; /* round up */
+        do_div(rate, c->div);
+
+        return rate;
+}
+
+static long tegra20_clk_double_round_rate(struct clk_hw *hw, unsigned long rate,
+                                unsigned long *prate)
+{
+        unsigned long output_rate = *prate;
+
+        do_div(output_rate, 2);
+        return output_rate;
+}
+
+static int tegra20_clk_double_set_rate(struct clk_hw *hw, unsigned long rate,
+                unsigned long parent_rate)
+{
+        if (rate != 2 * parent_rate)
+                return -EINVAL;
+        return 0;
+}
+
+struct clk_ops tegra_clk_double_ops = {
+        .is_enabled = tegra20_clk_double_is_enabled,
+        .enable = tegra20_periph_clk_enable,
+        .disable = tegra20_periph_clk_disable,
+        .set_rate = tegra20_clk_double_set_rate,
+        .recalc_rate = tegra20_clk_double_recalc_rate,
+        .round_rate = tegra20_clk_double_round_rate,
+};
+
+/* Audio sync clock ops */
+static int tegra20_audio_sync_clk_is_enabled(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val = clk_readl(c->reg);
+
+        c->state = (val & (1<<4)) ? OFF : ON;
+        return c->state;
+}
+
+static int tegra20_audio_sync_clk_enable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+
+        clk_writel(0, c->reg);
+        return 0;
+}
+
+static void tegra20_audio_sync_clk_disable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        clk_writel(1, c->reg);
+}
+
+static u8 tegra20_audio_sync_clk_get_parent(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val = clk_readl(c->reg);
+        int source;
+
+        source = val & 0xf;
+        return source;
+}
+
+static int tegra20_audio_sync_clk_set_parent(struct clk_hw *hw, u8 index)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val;
+
+        val = clk_readl(c->reg);
+        val &= ~0xf;
+        val |= index;
+
+        clk_writel(val, c->reg);
+
+        return 0;
+}
+
+struct clk_ops tegra_audio_sync_clk_ops = {
+        .is_enabled = tegra20_audio_sync_clk_is_enabled,
+        .enable = tegra20_audio_sync_clk_enable,
+        .disable = tegra20_audio_sync_clk_disable,
+        .set_parent = tegra20_audio_sync_clk_set_parent,
+        .get_parent = tegra20_audio_sync_clk_get_parent,
+};
+
+/* cdev1 and cdev2 (dap_mclk1 and dap_mclk2) ops */
+
+static int tegra20_cdev_clk_is_enabled(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        /* We could un-tristate the cdev1 or cdev2 pingroup here; this is
+         * currently done in the pinmux code. */
+        c->state = ON;
+
+        BUG_ON(!c->u.periph.clk_num);
+
+        if (!(clk_readl(CLK_OUT_ENB + PERIPH_CLK_TO_ENB_REG(c)) &
+                        PERIPH_CLK_TO_ENB_BIT(c)))
+                c->state = OFF;
+        return c->state;
+}
+
+static int tegra20_cdev_clk_enable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        BUG_ON(!c->u.periph.clk_num);
+
+        clk_writel(PERIPH_CLK_TO_ENB_BIT(c),
+                CLK_OUT_ENB_SET + PERIPH_CLK_TO_ENB_SET_REG(c));
+        return 0;
+}
+
+static void tegra20_cdev_clk_disable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        BUG_ON(!c->u.periph.clk_num);
+
+        clk_writel(PERIPH_CLK_TO_ENB_BIT(c),
+                CLK_OUT_ENB_CLR + PERIPH_CLK_TO_ENB_SET_REG(c));
+}
+
+static unsigned long tegra20_cdev_recalc_rate(struct clk_hw *hw,
+                        unsigned long prate)
+{
+        return to_clk_tegra(hw)->fixed_rate;
+}
+
+struct clk_ops tegra_cdev_clk_ops = {
+        .is_enabled = tegra20_cdev_clk_is_enabled,
+        .enable = tegra20_cdev_clk_enable,
+        .disable = tegra20_cdev_clk_disable,
+        .recalc_rate = tegra20_cdev_recalc_rate,
+};