ARM: 5644/1: add bcmring core.c, clock.c, clock.h

add core.c, clock.c, and clock.h in mach-bcmring

implement timer init, clocksource init, amba device init
implement clock set/get enable/disable API
add dummy clkdev.h

Signed-off-by: Leo Chen <leochen@broadcom.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

4 files changed, 631 insertions, 0 deletions

diff --git a/arch/arm/mach-bcmring/clock.c b/arch/arm/mach-bcmring/clock.c
new file mode 100644
index 00000000000..14bafc38f2d
--- /dev/null
+++ b/arch/arm/mach-bcmring/clock.c
@@ -0,0 +1,224 @@
+/*****************************************************************************
+* Copyright 2001 - 2009 Broadcom Corporation.  All rights reserved.
+*
+* Unless you and Broadcom execute a separate written software license
+* agreement governing use of this software, this software is licensed to you
+* under the terms of the GNU General Public License version 2, available at
+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+*
+* Notwithstanding the above, under no circumstances may you combine this
+* software in any way with any other Broadcom software provided under a
+* license other than the GPL, without Broadcom's express prior written
+* consent.
+*****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/clk.h>
+#include <linux/spinlock.h>
+#include <mach/csp/hw_cfg.h>
+#include <mach/csp/chipcHw_def.h>
+#include <mach/csp/chipcHw_reg.h>
+#include <mach/csp/chipcHw_inline.h>
+
+#include <asm/clkdev.h>
+
+#include "clock.h"
+
+#define clk_is_primary(x)       ((x)->type & CLK_TYPE_PRIMARY)
+#define clk_is_pll1(x)          ((x)->type & CLK_TYPE_PLL1)
+#define clk_is_pll2(x)          ((x)->type & CLK_TYPE_PLL2)
+#define clk_is_programmable(x)  ((x)->type & CLK_TYPE_PROGRAMMABLE)
+#define clk_is_bypassable(x)    ((x)->type & CLK_TYPE_BYPASSABLE)
+
+#define clk_is_using_xtal(x)    ((x)->mode & CLK_MODE_XTAL)
+
+static DEFINE_SPINLOCK(clk_lock);
+
+static void __clk_enable(struct clk *clk)
+{
+        if (!clk)
+                return;
+
+        /* enable parent clock first */
+        if (clk->parent)
+                __clk_enable(clk->parent);
+
+        if (clk->use_cnt++ == 0) {
+                if (clk_is_pll1(clk)) { /* PLL1 */
+                        chipcHw_pll1Enable(clk->rate_hz, 0);
+                } else if (clk_is_pll2(clk)) {  /* PLL2 */
+                        chipcHw_pll2Enable(clk->rate_hz);
+                } else if (clk_is_using_xtal(clk)) {    /* source is crystal */
+                        if (!clk_is_primary(clk))
+                                chipcHw_bypassClockEnable(clk->csp_id);
+                } else {        /* source is PLL */
+                        chipcHw_setClockEnable(clk->csp_id);
+                }
+        }
+}
+
+int clk_enable(struct clk *clk)
+{
+        unsigned long flags;
+
+        if (!clk)
+                return -EINVAL;
+
+        spin_lock_irqsave(&clk_lock, flags);
+        __clk_enable(clk);
+        spin_unlock_irqrestore(&clk_lock, flags);
+
+        return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+static void __clk_disable(struct clk *clk)
+{
+        if (!clk)
+                return;
+
+        BUG_ON(clk->use_cnt == 0);
+
+        if (--clk->use_cnt == 0) {
+                if (clk_is_pll1(clk)) { /* PLL1 */
+                        chipcHw_pll1Disable();
+                } else if (clk_is_pll2(clk)) {  /* PLL2 */
+                        chipcHw_pll2Disable();
+                } else if (clk_is_using_xtal(clk)) {    /* source is crystal */
+                        if (!clk_is_primary(clk))
+                                chipcHw_bypassClockDisable(clk->csp_id);
+                } else {        /* source is PLL */
+                        chipcHw_setClockDisable(clk->csp_id);
+                }
+        }
+
+        if (clk->parent)
+                __clk_disable(clk->parent);
+}
+
+void clk_disable(struct clk *clk)
+{
+        unsigned long flags;
+
+        if (!clk)
+                return;
+
+        spin_lock_irqsave(&clk_lock, flags);
+        __clk_disable(clk);
+        spin_unlock_irqrestore(&clk_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+        if (!clk)
+                return 0;
+
+        return clk->rate_hz;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+        unsigned long flags;
+        unsigned long actual;
+        unsigned long rate_hz;
+
+        if (!clk)
+                return -EINVAL;
+
+        if (!clk_is_programmable(clk))
+                return -EINVAL;
+
+        if (clk->use_cnt)
+                return -EBUSY;
+
+        spin_lock_irqsave(&clk_lock, flags);
+        actual = clk->parent->rate_hz;
+        rate_hz = min(actual, rate);
+        spin_unlock_irqrestore(&clk_lock, flags);
+
+        return rate_hz;
+}
+EXPORT_SYMBOL(clk_round_rate);
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+        unsigned long flags;
+        unsigned long actual;
+        unsigned long rate_hz;
+
+        if (!clk)
+                return -EINVAL;
+
+        if (!clk_is_programmable(clk))
+                return -EINVAL;
+
+        if (clk->use_cnt)
+                return -EBUSY;
+
+        spin_lock_irqsave(&clk_lock, flags);
+        actual = clk->parent->rate_hz;
+        rate_hz = min(actual, rate);
+        rate_hz = chipcHw_setClockFrequency(clk->csp_id, rate_hz);
+        clk->rate_hz = rate_hz;
+        spin_unlock_irqrestore(&clk_lock, flags);
+
+        return 0;
+}
+EXPORT_SYMBOL(clk_set_rate);
+
+struct clk *clk_get_parent(struct clk *clk)
+{
+        if (!clk)
+                return NULL;
+
+        return clk->parent;
+}
+EXPORT_SYMBOL(clk_get_parent);
+
+int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+        unsigned long flags;
+        struct clk *old_parent;
+
+        if (!clk || !parent)
+                return -EINVAL;
+
+        if (!clk_is_primary(parent) || !clk_is_bypassable(clk))
+                return -EINVAL;
+
+        /* if more than one user, parent is not allowed */
+        if (clk->use_cnt > 1)
+                return -EBUSY;
+
+        if (clk->parent == parent)
+                return 0;
+
+        spin_lock_irqsave(&clk_lock, flags);
+        old_parent = clk->parent;
+        clk->parent = parent;
+        if (clk_is_using_xtal(parent))
+                clk->mode |= CLK_MODE_XTAL;
+        else
+                clk->mode &= (~CLK_MODE_XTAL);
+
+        /* if clock is active */
+        if (clk->use_cnt != 0) {
+                clk->use_cnt--;
+                /* enable clock with the new parent */
+                __clk_enable(clk);
+                /* disable the old parent */
+                __clk_disable(old_parent);
+        }
+        spin_unlock_irqrestore(&clk_lock, flags);
+
+        return 0;
+}
+EXPORT_SYMBOL(clk_set_parent);
diff --git a/arch/arm/mach-bcmring/clock.h b/arch/arm/mach-bcmring/clock.h
new file mode 100644
index 00000000000..5e0b9813897
--- /dev/null
+++ b/arch/arm/mach-bcmring/clock.h
@@ -0,0 +1,33 @@
+/*****************************************************************************
+* Copyright 2001 - 2009 Broadcom Corporation.  All rights reserved.
+*
+* Unless you and Broadcom execute a separate written software license
+* agreement governing use of this software, this software is licensed to you
+* under the terms of the GNU General Public License version 2, available at
+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+*
+* Notwithstanding the above, under no circumstances may you combine this
+* software in any way with any other Broadcom software provided under a
+* license other than the GPL, without Broadcom's express prior written
+* consent.
+*****************************************************************************/
+#include <mach/csp/chipcHw_def.h>
+
+#define CLK_TYPE_PRIMARY         1      /* primary clock must NOT have a parent */
+#define CLK_TYPE_PLL1            2      /* PPL1 */
+#define CLK_TYPE_PLL2            4      /* PPL2 */
+#define CLK_TYPE_PROGRAMMABLE    8      /* programmable clock rate */
+#define CLK_TYPE_BYPASSABLE      16     /* parent can be changed */
+
+#define CLK_MODE_XTAL            1      /* clock source is from crystal */
+
+struct clk {
+        const char *name;       /* clock name */
+        unsigned int type;      /* clock type */
+        unsigned int mode;      /* current mode */
+        volatile int use_bypass;        /* indicate if it's in bypass mode */
+        chipcHw_CLOCK_e csp_id; /* clock ID for CSP CHIPC */
+        unsigned long rate_hz;  /* clock rate in Hz */
+        unsigned int use_cnt;   /* usage count */
+        struct clk *parent;     /* parent clock */
+};
diff --git a/arch/arm/mach-bcmring/core.c b/arch/arm/mach-bcmring/core.c
new file mode 100644
index 00000000000..492c649f451
--- /dev/null
+++ b/arch/arm/mach-bcmring/core.c
@@ -0,0 +1,367 @@
+/*
+ *  derived from linux/arch/arm/mach-versatile/core.c
+ *  linux/arch/arm/mach-bcmring/core.c
+ *
+ *  Copyright (C) 1999 - 2003 ARM Limited
+ *  Copyright (C) 2000 Deep Blue Solutions Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+/* Portions copyright Broadcom 2008 */
+
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_device.h>
+#include <linux/sysdev.h>
+#include <linux/interrupt.h>
+#include <linux/amba/bus.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+
+#include <linux/amba/bus.h>
+#include <mach/csp/mm_addr.h>
+#include <mach/hardware.h>
+#include <asm/clkdev.h>
+#include <linux/io.h>
+#include <asm/irq.h>
+#include <asm/hardware/arm_timer.h>
+#include <asm/mach-types.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/flash.h>
+#include <asm/mach/irq.h>
+#include <asm/mach/time.h>
+#include <asm/mach/map.h>
+#include <asm/mach/mmc.h>
+
+#include <cfg_global.h>
+
+#include "clock.h"
+
+#include <csp/secHw.h>
+#include <mach/csp/secHw_def.h>
+#include <mach/csp/chipcHw_inline.h>
+#include <mach/csp/tmrHw_reg.h>
+
+#define AMBA_DEVICE(name, initname, base, plat, size)       \
+static struct amba_device name##_device = {     \
+   .dev = {                                     \
+      .coherent_dma_mask = ~0,                  \
+      .init_name = initname,                    \
+      .platform_data = plat                     \
+   },                                           \
+   .res = {                                     \
+      .start = MM_ADDR_IO_##base,               \
+                .end = MM_ADDR_IO_##base + (size) - 1,    \
+      .flags = IORESOURCE_MEM                   \
+   },                                           \
+   .dma_mask = ~0,                              \
+   .irq = {                                     \
+      IRQ_##base                                \
+   }                                            \
+}
+
+
+AMBA_DEVICE(uartA, "uarta", UARTA, NULL, SZ_4K);
+AMBA_DEVICE(uartB, "uartb", UARTB, NULL, SZ_4K);
+
+static struct clk pll1_clk = {
+        .name = "PLL1",
+        .type = CLK_TYPE_PRIMARY | CLK_TYPE_PLL1,
+        .rate_hz = 2000000000,
+        .use_cnt = 7,
+};
+
+static struct clk uart_clk = {
+        .name = "UART",
+        .type = CLK_TYPE_PROGRAMMABLE,
+        .csp_id = chipcHw_CLOCK_UART,
+        .rate_hz = HW_CFG_UART_CLK_HZ,
+        .parent = &pll1_clk,
+};
+
+static struct clk_lookup lookups[] = {
+        {                       /* UART0 */
+         .dev_id = "uarta",
+         .clk = &uart_clk,
+         }, {                   /* UART1 */
+             .dev_id = "uartb",
+             .clk = &uart_clk,
+             }
+};
+
+static struct amba_device *amba_devs[] __initdata = {
+        &uartA_device,
+        &uartB_device,
+};
+
+void __init bcmring_amba_init(void)
+{
+        int i;
+        u32 bus_clock;
+
+/* Linux is run initially in non-secure mode. Secure peripherals */
+/* generate FIQ, and must be handled in secure mode. Until we have */
+/* a linux security monitor implementation, keep everything in */
+/* non-secure mode. */
+        chipcHw_busInterfaceClockEnable(chipcHw_REG_BUS_CLOCK_SPU);
+        secHw_setUnsecure(secHw_BLK_MASK_CHIP_CONTROL |
+                          secHw_BLK_MASK_KEY_SCAN |
+                          secHw_BLK_MASK_TOUCH_SCREEN |
+                          secHw_BLK_MASK_UART0 |
+                          secHw_BLK_MASK_UART1 |
+                          secHw_BLK_MASK_WATCHDOG |
+                          secHw_BLK_MASK_SPUM |
+                          secHw_BLK_MASK_DDR2 |
+                          secHw_BLK_MASK_SPU |
+                          secHw_BLK_MASK_PKA |
+                          secHw_BLK_MASK_RNG |
+                          secHw_BLK_MASK_RTC |
+                          secHw_BLK_MASK_OTP |
+                          secHw_BLK_MASK_BOOT |
+                          secHw_BLK_MASK_MPU |
+                          secHw_BLK_MASK_TZCTRL | secHw_BLK_MASK_INTR);
+
+        /* Only the devices attached to the AMBA bus are enabled just before the bus is */
+        /* scanned and the drivers are loaded. The clocks need to be on for the AMBA bus */
+        /* driver to access these blocks. The bus is probed, and the drivers are loaded. */
+        /* FIXME Need to remove enable of PIF once CLCD clock enable used properly in FPGA. */
+        bus_clock = chipcHw_REG_BUS_CLOCK_GE
+            | chipcHw_REG_BUS_CLOCK_SDIO0 | chipcHw_REG_BUS_CLOCK_SDIO1;
+
+        chipcHw_busInterfaceClockEnable(bus_clock);
+
+        for (i = 0; i < ARRAY_SIZE(lookups); i++)
+                clkdev_add(&lookups[i]);
+
+        for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
+                struct amba_device *d = amba_devs[i];
+                amba_device_register(d, &iomem_resource);
+        }
+}
+
+/*
+ * Where is the timer (VA)?
+ */
+#define TIMER0_VA_BASE           MM_IO_BASE_TMR
+#define TIMER1_VA_BASE          (MM_IO_BASE_TMR + 0x20)
+#define TIMER2_VA_BASE          (MM_IO_BASE_TMR + 0x40)
+#define TIMER3_VA_BASE          (MM_IO_BASE_TMR + 0x60)
+
+/* Timer 0 - 25 MHz, Timer3 at bus clock rate, typically  150-166 MHz */
+#if defined(CONFIG_ARCH_FPGA11107)
+/* fpga cpu/bus are currently 30 times slower so scale frequency as well to */
+/* slow down Linux's sense of time */
+#define TIMER0_FREQUENCY_MHZ  (tmrHw_LOW_FREQUENCY_MHZ * 30)
+#define TIMER1_FREQUENCY_MHZ  (tmrHw_LOW_FREQUENCY_MHZ * 30)
+#define TIMER3_FREQUENCY_MHZ  (tmrHw_HIGH_FREQUENCY_MHZ * 30)
+#define TIMER3_FREQUENCY_KHZ   (tmrHw_HIGH_FREQUENCY_HZ / 1000 * 30)
+#else
+#define TIMER0_FREQUENCY_MHZ  tmrHw_LOW_FREQUENCY_MHZ
+#define TIMER1_FREQUENCY_MHZ  tmrHw_LOW_FREQUENCY_MHZ
+#define TIMER3_FREQUENCY_MHZ  tmrHw_HIGH_FREQUENCY_MHZ
+#define TIMER3_FREQUENCY_KHZ  (tmrHw_HIGH_FREQUENCY_HZ / 1000)
+#endif
+
+#define TICKS_PER_uSEC     TIMER0_FREQUENCY_MHZ
+
+/*
+ *  These are useconds NOT ticks.
+ *
+ */
+#define mSEC_1                          1000
+#define mSEC_5                          (mSEC_1 * 5)
+#define mSEC_10                         (mSEC_1 * 10)
+#define mSEC_25                         (mSEC_1 * 25)
+#define SEC_1                           (mSEC_1 * 1000)
+
+/*
+ * How long is the timer interval?
+ */
+#define TIMER_INTERVAL  (TICKS_PER_uSEC * mSEC_10)
+#if TIMER_INTERVAL >= 0x100000
+#define TIMER_RELOAD    (TIMER_INTERVAL >> 8)
+#define TIMER_DIVISOR   (TIMER_CTRL_DIV256)
+#define TICKS2USECS(x)  (256 * (x) / TICKS_PER_uSEC)
+#elif TIMER_INTERVAL >= 0x10000
+#define TIMER_RELOAD    (TIMER_INTERVAL >> 4)   /* Divide by 16 */
+#define TIMER_DIVISOR   (TIMER_CTRL_DIV16)
+#define TICKS2USECS(x)  (16 * (x) / TICKS_PER_uSEC)
+#else
+#define TIMER_RELOAD    (TIMER_INTERVAL)
+#define TIMER_DIVISOR   (TIMER_CTRL_DIV1)
+#define TICKS2USECS(x)  ((x) / TICKS_PER_uSEC)
+#endif
+
+static void timer_set_mode(enum clock_event_mode mode,
+                           struct clock_event_device *clk)
+{
+        unsigned long ctrl;
+
+        switch (mode) {
+        case CLOCK_EVT_MODE_PERIODIC:
+                writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_LOAD);
+
+                ctrl = TIMER_CTRL_PERIODIC;
+                ctrl |=
+                    TIMER_DIVISOR | TIMER_CTRL_32BIT | TIMER_CTRL_IE |
+                    TIMER_CTRL_ENABLE;
+                break;
+        case CLOCK_EVT_MODE_ONESHOT:
+                /* period set, and timer enabled in 'next_event' hook */
+                ctrl = TIMER_CTRL_ONESHOT;
+                ctrl |= TIMER_DIVISOR | TIMER_CTRL_32BIT | TIMER_CTRL_IE;
+                break;
+        case CLOCK_EVT_MODE_UNUSED:
+        case CLOCK_EVT_MODE_SHUTDOWN:
+        default:
+                ctrl = 0;
+        }
+
+        writel(ctrl, TIMER0_VA_BASE + TIMER_CTRL);
+}
+
+static int timer_set_next_event(unsigned long evt,
+                                struct clock_event_device *unused)
+{
+        unsigned long ctrl = readl(TIMER0_VA_BASE + TIMER_CTRL);
+
+        writel(evt, TIMER0_VA_BASE + TIMER_LOAD);
+        writel(ctrl | TIMER_CTRL_ENABLE, TIMER0_VA_BASE + TIMER_CTRL);
+
+        return 0;
+}
+
+static struct clock_event_device timer0_clockevent = {
+        .name = "timer0",
+        .shift = 32,
+        .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+        .set_mode = timer_set_mode,
+        .set_next_event = timer_set_next_event,
+};
+
+/*
+ * IRQ handler for the timer
+ */
+static irqreturn_t bcmring_timer_interrupt(int irq, void *dev_id)
+{
+        struct clock_event_device *evt = &timer0_clockevent;
+
+        writel(1, TIMER0_VA_BASE + TIMER_INTCLR);
+
+        evt->event_handler(evt);
+
+        return IRQ_HANDLED;
+}
+
+static struct irqaction bcmring_timer_irq = {
+        .name = "bcmring Timer Tick",
+        .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+        .handler = bcmring_timer_interrupt,
+};
+
+static cycle_t bcmring_get_cycles_timer1(void)
+{
+        return ~readl(TIMER1_VA_BASE + TIMER_VALUE);
+}
+
+static cycle_t bcmring_get_cycles_timer3(void)
+{
+        return ~readl(TIMER3_VA_BASE + TIMER_VALUE);
+}
+
+static struct clocksource clocksource_bcmring_timer1 = {
+        .name = "timer1",
+        .rating = 200,
+        .read = bcmring_get_cycles_timer1,
+        .mask = CLOCKSOURCE_MASK(32),
+        .shift = 20,
+        .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static struct clocksource clocksource_bcmring_timer3 = {
+        .name = "timer3",
+        .rating = 100,
+        .read = bcmring_get_cycles_timer3,
+        .mask = CLOCKSOURCE_MASK(32),
+        .shift = 20,
+        .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static int __init bcmring_clocksource_init(void)
+{
+        /* setup timer1 as free-running clocksource */
+        writel(0, TIMER1_VA_BASE + TIMER_CTRL);
+        writel(0xffffffff, TIMER1_VA_BASE + TIMER_LOAD);
+        writel(0xffffffff, TIMER1_VA_BASE + TIMER_VALUE);
+        writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
+               TIMER1_VA_BASE + TIMER_CTRL);
+
+        clocksource_bcmring_timer1.mult =
+            clocksource_khz2mult(TIMER1_FREQUENCY_MHZ * 1000,
+                                 clocksource_bcmring_timer1.shift);
+        clocksource_register(&clocksource_bcmring_timer1);
+
+        /* setup timer3 as free-running clocksource */
+        writel(0, TIMER3_VA_BASE + TIMER_CTRL);
+        writel(0xffffffff, TIMER3_VA_BASE + TIMER_LOAD);
+        writel(0xffffffff, TIMER3_VA_BASE + TIMER_VALUE);
+        writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
+               TIMER3_VA_BASE + TIMER_CTRL);
+
+        clocksource_bcmring_timer3.mult =
+            clocksource_khz2mult(TIMER3_FREQUENCY_KHZ,
+                                 clocksource_bcmring_timer3.shift);
+        clocksource_register(&clocksource_bcmring_timer3);
+
+        return 0;
+}
+
+/*
+ * Set up timer interrupt, and return the current time in seconds.
+ */
+void __init bcmring_init_timer(void)
+{
+        printk(KERN_INFO "bcmring_init_timer\n");
+        /*
+         * Initialise to a known state (all timers off)
+         */
+        writel(0, TIMER0_VA_BASE + TIMER_CTRL);
+        writel(0, TIMER1_VA_BASE + TIMER_CTRL);
+        writel(0, TIMER2_VA_BASE + TIMER_CTRL);
+        writel(0, TIMER3_VA_BASE + TIMER_CTRL);
+
+        /*
+         * Make irqs happen for the system timer
+         */
+        setup_irq(IRQ_TIMER0, &bcmring_timer_irq);
+
+        bcmring_clocksource_init();
+
+        timer0_clockevent.mult =
+            div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift);
+        timer0_clockevent.max_delta_ns =
+            clockevent_delta2ns(0xffffffff, &timer0_clockevent);
+        timer0_clockevent.min_delta_ns =
+            clockevent_delta2ns(0xf, &timer0_clockevent);
+
+        timer0_clockevent.cpumask = cpumask_of(0);
+        clockevents_register_device(&timer0_clockevent);
+}
+
+struct sys_timer bcmring_timer = {
+        .init = bcmring_init_timer,
+};
diff --git a/arch/arm/mach-bcmring/include/mach/clkdev.h b/arch/arm/mach-bcmring/include/mach/clkdev.h
new file mode 100644
index 00000000000..04b37a89801
--- /dev/null
+++ b/arch/arm/mach-bcmring/include/mach/clkdev.h
@@ -0,0 +1,7 @@
+#ifndef __ASM_MACH_CLKDEV_H
+#define __ASM_MACH_CLKDEV_H
+
+#define __clk_get(clk) ({ 1; })
+#define __clk_put(clk) do { } while (0)
+
+#endif