5 files changed, 596 insertions, 59 deletions

diff --git a/arch/arm/plat-nomadik/Kconfig b/arch/arm/plat-nomadik/Kconfig
index 159daf583f85..5da3f97c537b 100644
--- a/arch/arm/plat-nomadik/Kconfig
+++ b/arch/arm/plat-nomadik/Kconfig
@@ -19,4 +19,9 @@ config HAS_MTU
           to multiple interrupt generating programmable
           32-bit free running decrementing counters.
 
+config NOMADIK_GPIO
+        bool
+        help
+          Support for the Nomadik GPIO controller.
+
 endif
diff --git a/arch/arm/plat-nomadik/Makefile b/arch/arm/plat-nomadik/Makefile
index 37c7cdd0f8f0..c33547361bd7 100644
--- a/arch/arm/plat-nomadik/Makefile
+++ b/arch/arm/plat-nomadik/Makefile
@@ -3,3 +3,4 @@
 # Licensed under GPLv2
 
 obj-$(CONFIG_HAS_MTU)   += timer.o
+obj-$(CONFIG_NOMADIK_GPIO)      += gpio.o
diff --git a/arch/arm/plat-nomadik/gpio.c b/arch/arm/plat-nomadik/gpio.c
new file mode 100644
index 000000000000..d28900cfa541
--- /dev/null
+++ b/arch/arm/plat-nomadik/gpio.c
@@ -0,0 +1,434 @@
+/*
+ * Generic GPIO driver for logic cells found in the Nomadik SoC
+ *
+ * Copyright (C) 2008,2009 STMicroelectronics
+ * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
+ *   Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+
+#include <mach/hardware.h>
+#include <mach/gpio.h>
+
+/*
+ * The GPIO module in the Nomadik family of Systems-on-Chip is an
+ * AMBA device, managing 32 pins and alternate functions.  The logic block
+ * is currently only used in the Nomadik.
+ *
+ * Symbols in this file are called "nmk_gpio" for "nomadik gpio"
+ */
+
+#define NMK_GPIO_PER_CHIP 32
+struct nmk_gpio_chip {
+        struct gpio_chip chip;
+        void __iomem *addr;
+        struct clk *clk;
+        unsigned int parent_irq;
+        spinlock_t lock;
+        /* Keep track of configured edges */
+        u32 edge_rising;
+        u32 edge_falling;
+};
+
+/* Mode functions */
+int nmk_gpio_set_mode(int gpio, int gpio_mode)
+{
+        struct nmk_gpio_chip *nmk_chip;
+        unsigned long flags;
+        u32 afunc, bfunc, bit;
+
+        nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
+        if (!nmk_chip)
+                return -EINVAL;
+
+        bit = 1 << (gpio - nmk_chip->chip.base);
+
+        spin_lock_irqsave(&nmk_chip->lock, flags);
+        afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit;
+        bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit;
+        if (gpio_mode & NMK_GPIO_ALT_A)
+                afunc |= bit;
+        if (gpio_mode & NMK_GPIO_ALT_B)
+                bfunc |= bit;
+        writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA);
+        writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB);
+        spin_unlock_irqrestore(&nmk_chip->lock, flags);
+
+        return 0;
+}
+EXPORT_SYMBOL(nmk_gpio_set_mode);
+
+int nmk_gpio_get_mode(int gpio)
+{
+        struct nmk_gpio_chip *nmk_chip;
+        u32 afunc, bfunc, bit;
+
+        nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
+        if (!nmk_chip)
+                return -EINVAL;
+
+        bit = 1 << (gpio - nmk_chip->chip.base);
+
+        afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit;
+        bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit;
+
+        return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0);
+}
+EXPORT_SYMBOL(nmk_gpio_get_mode);
+
+
+/* IRQ functions */
+static inline int nmk_gpio_get_bitmask(int gpio)
+{
+        return 1 << (gpio % 32);
+}
+
+static void nmk_gpio_irq_ack(unsigned int irq)
+{
+        int gpio;
+        struct nmk_gpio_chip *nmk_chip;
+
+        gpio = NOMADIK_IRQ_TO_GPIO(irq);
+        nmk_chip = get_irq_chip_data(irq);
+        if (!nmk_chip)
+                return;
+        writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC);
+}
+
+static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip,
+                                  int gpio, bool enable)
+{
+        u32 bitmask = nmk_gpio_get_bitmask(gpio);
+        u32 reg;
+
+        /* we must individually set/clear the two edges */
+        if (nmk_chip->edge_rising & bitmask) {
+                reg = readl(nmk_chip->addr + NMK_GPIO_RIMSC);
+                if (enable)
+                        reg |= bitmask;
+                else
+                        reg &= ~bitmask;
+                writel(reg, nmk_chip->addr + NMK_GPIO_RIMSC);
+        }
+        if (nmk_chip->edge_falling & bitmask) {
+                reg = readl(nmk_chip->addr + NMK_GPIO_FIMSC);
+                if (enable)
+                        reg |= bitmask;
+                else
+                        reg &= ~bitmask;
+                writel(reg, nmk_chip->addr + NMK_GPIO_FIMSC);
+        }
+}
+
+static void nmk_gpio_irq_modify(unsigned int irq, bool enable)
+{
+        int gpio;
+        struct nmk_gpio_chip *nmk_chip;
+        unsigned long flags;
+        u32 bitmask;
+
+        gpio = NOMADIK_IRQ_TO_GPIO(irq);
+        nmk_chip = get_irq_chip_data(irq);
+        bitmask = nmk_gpio_get_bitmask(gpio);
+        if (!nmk_chip)
+                return;
+
+        spin_lock_irqsave(&nmk_chip->lock, flags);
+        __nmk_gpio_irq_modify(nmk_chip, gpio, enable);
+        spin_unlock_irqrestore(&nmk_chip->lock, flags);
+}
+
+static void nmk_gpio_irq_mask(unsigned int irq)
+{
+        nmk_gpio_irq_modify(irq, false);
+};
+
+static void nmk_gpio_irq_unmask(unsigned int irq)
+{
+        nmk_gpio_irq_modify(irq, true);
+}
+
+static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
+{
+        bool enabled = !(irq_to_desc(irq)->status & IRQ_DISABLED);
+        int gpio;
+        struct nmk_gpio_chip *nmk_chip;
+        unsigned long flags;
+        u32 bitmask;
+
+        gpio = NOMADIK_IRQ_TO_GPIO(irq);
+        nmk_chip = get_irq_chip_data(irq);
+        bitmask = nmk_gpio_get_bitmask(gpio);
+        if (!nmk_chip)
+                return -EINVAL;
+
+        if (type & IRQ_TYPE_LEVEL_HIGH)
+                return -EINVAL;
+        if (type & IRQ_TYPE_LEVEL_LOW)
+                return -EINVAL;
+
+        spin_lock_irqsave(&nmk_chip->lock, flags);
+
+        if (enabled)
+                __nmk_gpio_irq_modify(nmk_chip, gpio, false);
+
+        nmk_chip->edge_rising &= ~bitmask;
+        if (type & IRQ_TYPE_EDGE_RISING)
+                nmk_chip->edge_rising |= bitmask;
+
+        nmk_chip->edge_falling &= ~bitmask;
+        if (type & IRQ_TYPE_EDGE_FALLING)
+                nmk_chip->edge_falling |= bitmask;
+
+        if (enabled)
+                __nmk_gpio_irq_modify(nmk_chip, gpio, true);
+
+        spin_unlock_irqrestore(&nmk_chip->lock, flags);
+
+        return 0;
+}
+
+static struct irq_chip nmk_gpio_irq_chip = {
+        .name           = "Nomadik-GPIO",
+        .ack            = nmk_gpio_irq_ack,
+        .mask           = nmk_gpio_irq_mask,
+        .unmask         = nmk_gpio_irq_unmask,
+        .set_type       = nmk_gpio_irq_set_type,
+};
+
+static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+        struct nmk_gpio_chip *nmk_chip;
+        struct irq_chip *host_chip = get_irq_chip(irq);
+        unsigned int gpio_irq;
+        u32 pending;
+        unsigned int first_irq;
+
+        if (host_chip->mask_ack)
+                host_chip->mask_ack(irq);
+        else {
+                host_chip->mask(irq);
+                if (host_chip->ack)
+                        host_chip->ack(irq);
+        }
+
+        nmk_chip = get_irq_data(irq);
+        first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
+        while ( (pending = readl(nmk_chip->addr + NMK_GPIO_IS)) ) {
+                gpio_irq = first_irq + __ffs(pending);
+                generic_handle_irq(gpio_irq);
+        }
+
+        host_chip->unmask(irq);
+}
+
+static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
+{
+        unsigned int first_irq;
+        int i;
+
+        first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
+        for (i = first_irq; i < first_irq + NMK_GPIO_PER_CHIP; i++) {
+                set_irq_chip(i, &nmk_gpio_irq_chip);
+                set_irq_handler(i, handle_edge_irq);
+                set_irq_flags(i, IRQF_VALID);
+                set_irq_chip_data(i, nmk_chip);
+                set_irq_type(i, IRQ_TYPE_EDGE_FALLING);
+        }
+        set_irq_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
+        set_irq_data(nmk_chip->parent_irq, nmk_chip);
+        return 0;
+}
+
+/* I/O Functions */
+static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
+{
+        struct nmk_gpio_chip *nmk_chip =
+                container_of(chip, struct nmk_gpio_chip, chip);
+
+        writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
+        return 0;
+}
+
+static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
+                                int val)
+{
+        struct nmk_gpio_chip *nmk_chip =
+                container_of(chip, struct nmk_gpio_chip, chip);
+
+        writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS);
+        return 0;
+}
+
+static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
+{
+        struct nmk_gpio_chip *nmk_chip =
+                container_of(chip, struct nmk_gpio_chip, chip);
+        u32 bit = 1 << offset;
+
+        return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;
+}
+
+static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
+                                int val)
+{
+        struct nmk_gpio_chip *nmk_chip =
+                container_of(chip, struct nmk_gpio_chip, chip);
+        u32 bit = 1 << offset;
+
+        if (val)
+                writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
+        else
+                writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
+}
+
+/* This structure is replicated for each GPIO block allocated at probe time */
+static struct gpio_chip nmk_gpio_template = {
+        .direction_input        = nmk_gpio_make_input,
+        .get                    = nmk_gpio_get_input,
+        .direction_output       = nmk_gpio_make_output,
+        .set                    = nmk_gpio_set_output,
+        .ngpio                  = NMK_GPIO_PER_CHIP,
+        .can_sleep              = 0,
+};
+
+static int __init nmk_gpio_probe(struct platform_device *dev)
+{
+        struct nmk_gpio_platform_data *pdata = dev->dev.platform_data;
+        struct nmk_gpio_chip *nmk_chip;
+        struct gpio_chip *chip;
+        struct resource *res;
+        struct clk *clk;
+        int irq;
+        int ret;
+
+        if (!pdata)
+                return -ENODEV;
+
+        res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+        if (!res) {
+                ret = -ENOENT;
+                goto out;
+        }
+
+        irq = platform_get_irq(dev, 0);
+        if (irq < 0) {
+                ret = irq;
+                goto out;
+        }
+
+        if (request_mem_region(res->start, resource_size(res),
+                               dev_name(&dev->dev)) == NULL) {
+                ret = -EBUSY;
+                goto out;
+        }
+
+        clk = clk_get(&dev->dev, NULL);
+        if (IS_ERR(clk)) {
+                ret = PTR_ERR(clk);
+                goto out_release;
+        }
+
+        clk_enable(clk);
+
+        nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL);
+        if (!nmk_chip) {
+                ret = -ENOMEM;
+                goto out_clk;
+        }
+        /*
+         * The virt address in nmk_chip->addr is in the nomadik register space,
+         * so we can simply convert the resource address, without remapping
+         */
+        nmk_chip->clk = clk;
+        nmk_chip->addr = io_p2v(res->start);
+        nmk_chip->chip = nmk_gpio_template;
+        nmk_chip->parent_irq = irq;
+        spin_lock_init(&nmk_chip->lock);
+
+        chip = &nmk_chip->chip;
+        chip->base = pdata->first_gpio;
+        chip->label = pdata->name;
+        chip->dev = &dev->dev;
+        chip->owner = THIS_MODULE;
+
+        ret = gpiochip_add(&nmk_chip->chip);
+        if (ret)
+                goto out_free;
+
+        platform_set_drvdata(dev, nmk_chip);
+
+        nmk_gpio_init_irq(nmk_chip);
+
+        dev_info(&dev->dev, "Bits %i-%i at address %p\n",
+                 nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr);
+        return 0;
+
+out_free:
+        kfree(nmk_chip);
+out_clk:
+        clk_disable(clk);
+        clk_put(clk);
+out_release:
+        release_mem_region(res->start, resource_size(res));
+out:
+        dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret,
+                  pdata->first_gpio, pdata->first_gpio+31);
+        return ret;
+}
+
+static int __exit nmk_gpio_remove(struct platform_device *dev)
+{
+        struct nmk_gpio_chip *nmk_chip;
+        struct resource *res;
+
+        res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+
+        nmk_chip = platform_get_drvdata(dev);
+        gpiochip_remove(&nmk_chip->chip);
+        clk_disable(nmk_chip->clk);
+        clk_put(nmk_chip->clk);
+        kfree(nmk_chip);
+        release_mem_region(res->start, resource_size(res));
+        return 0;
+}
+
+
+static struct platform_driver nmk_gpio_driver = {
+        .driver = {
+                .owner = THIS_MODULE,
+                .name = "gpio",
+                },
+        .probe = nmk_gpio_probe,
+        .remove = __exit_p(nmk_gpio_remove),
+        .suspend = NULL, /* to be done */
+        .resume = NULL,
+};
+
+static int __init nmk_gpio_init(void)
+{
+        return platform_driver_register(&nmk_gpio_driver);
+}
+
+arch_initcall(nmk_gpio_init);
+
+MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
+MODULE_DESCRIPTION("Nomadik GPIO Driver");
+MODULE_LICENSE("GPL");
+
+
diff --git a/arch/arm/plat-nomadik/include/plat/gpio.h b/arch/arm/plat-nomadik/include/plat/gpio.h
new file mode 100644
index 000000000000..4200811249ca
--- /dev/null
+++ b/arch/arm/plat-nomadik/include/plat/gpio.h
@@ -0,0 +1,70 @@
+/*
+ * Structures and registers for GPIO access in the Nomadik SoC
+ *
+ * Copyright (C) 2008 STMicroelectronics
+ *     Author: Prafulla WADASKAR <prafulla.wadaskar@st.com>
+ * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __ASM_PLAT_GPIO_H
+#define __ASM_PLAT_GPIO_H
+
+#include <asm-generic/gpio.h>
+
+/*
+ * These currently cause a function call to happen, they may be optimized
+ * if needed by adding cpu-specific defines to identify blocks
+ * (see mach-pxa/include/mach/gpio.h as an example using GPLR etc)
+ */
+#define gpio_get_value  __gpio_get_value
+#define gpio_set_value  __gpio_set_value
+#define gpio_cansleep   __gpio_cansleep
+#define gpio_to_irq     __gpio_to_irq
+
+/*
+ * "nmk_gpio" and "NMK_GPIO" stand for "Nomadik GPIO", leaving
+ * the "gpio" namespace for generic and cross-machine functions
+ */
+
+/* Register in the logic block */
+#define NMK_GPIO_DAT    0x00
+#define NMK_GPIO_DATS   0x04
+#define NMK_GPIO_DATC   0x08
+#define NMK_GPIO_PDIS   0x0c
+#define NMK_GPIO_DIR    0x10
+#define NMK_GPIO_DIRS   0x14
+#define NMK_GPIO_DIRC   0x18
+#define NMK_GPIO_SLPC   0x1c
+#define NMK_GPIO_AFSLA  0x20
+#define NMK_GPIO_AFSLB  0x24
+
+#define NMK_GPIO_RIMSC  0x40
+#define NMK_GPIO_FIMSC  0x44
+#define NMK_GPIO_IS     0x48
+#define NMK_GPIO_IC     0x4c
+#define NMK_GPIO_RWIMSC 0x50
+#define NMK_GPIO_FWIMSC 0x54
+#define NMK_GPIO_WKS    0x58
+
+/* Alternate functions: function C is set in hw by setting both A and B */
+#define NMK_GPIO_ALT_GPIO       0
+#define NMK_GPIO_ALT_A  1
+#define NMK_GPIO_ALT_B  2
+#define NMK_GPIO_ALT_C  (NMK_GPIO_ALT_A | NMK_GPIO_ALT_B)
+
+extern int nmk_gpio_set_mode(int gpio, int gpio_mode);
+extern int nmk_gpio_get_mode(int gpio);
+
+/*
+ * Platform data to register a block: only the initial gpio/irq number.
+ */
+struct nmk_gpio_platform_data {
+        char *name;
+        int first_gpio;
+        int first_irq;
+};
+
+#endif /* __ASM_PLAT_GPIO_H */
diff --git a/arch/arm/plat-nomadik/timer.c b/arch/arm/plat-nomadik/timer.c
index fa7cb3a57cbf..0ff3798769ab 100644
--- a/arch/arm/plat-nomadik/timer.c
+++ b/arch/arm/plat-nomadik/timer.c
@@ -2,7 +2,7 @@
  *  linux/arch/arm/mach-nomadik/timer.c
  *
  * Copyright (C) 2008 STMicroelectronics
- * Copyright (C) 2009 Alessandro Rubini, somewhat based on at91sam926x
+ * Copyright (C) 2010 Alessandro Rubini
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2, as
@@ -18,123 +18,150 @@
 
 #include <plat/mtu.h>
 
-static u32      nmdk_count;             /* accumulated count */
-static u32      nmdk_cycle;             /* write-once */
-
-/* setup by the platform code */
-void __iomem *mtu_base;
+void __iomem *mtu_base; /* ssigned by machine code */
 
 /*
- * clocksource: the MTU device is a decrementing counters, so we negate
- * the value being read.
+ * Kernel assumes that sched_clock can be called early
+ * but the MTU may not yet be initialized.
  */
-static cycle_t nmdk_read_timer(struct clocksource *cs)
+static cycle_t nmdk_read_timer_dummy(struct clocksource *cs)
 {
-        u32 count = readl(mtu_base + MTU_VAL(0));
-        return nmdk_count + nmdk_cycle - count;
+        return 0;
+}
 
+/* clocksource: MTU decrements, so we negate the value being read. */
+static cycle_t nmdk_read_timer(struct clocksource *cs)
+{
+        return -readl(mtu_base + MTU_VAL(0));
 }
 
 static struct clocksource nmdk_clksrc = {
         .name           = "mtu_0",
-        .rating         = 120,
-        .read           = nmdk_read_timer,
+        .rating         = 200,
+        .read           = nmdk_read_timer_dummy,
+        .mask           = CLOCKSOURCE_MASK(32),
         .shift          = 20,
         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
 /*
- * Clockevent device: currently only periodic mode is supported
+ * Override the global weak sched_clock symbol with this
+ * local implementation which uses the clocksource to get some
+ * better resolution when scheduling the kernel. We accept that
+ * this wraps around for now, since it is just a relative time
+ * stamp. (Inspired by OMAP implementation.)
  */
+unsigned long long notrace sched_clock(void)
+{
+        return clocksource_cyc2ns(nmdk_clksrc.read(
+                                  &nmdk_clksrc),
+                                  nmdk_clksrc.mult,
+                                  nmdk_clksrc.shift);
+}
+
+/* Clockevent device: use one-shot mode */
 static void nmdk_clkevt_mode(enum clock_event_mode mode,
                              struct clock_event_device *dev)
 {
+        u32 cr;
+
         switch (mode) {
         case CLOCK_EVT_MODE_PERIODIC:
-                /* count current value? */
-                writel(readl(mtu_base + MTU_IMSC) | 1, mtu_base + MTU_IMSC);
+                pr_err("%s: periodic mode not supported\n", __func__);
                 break;
         case CLOCK_EVT_MODE_ONESHOT:
-                BUG(); /* Not supported, yet */
-                /* FALLTHROUGH */
+                /* Load highest value, enable device, enable interrupts */
+                cr = readl(mtu_base + MTU_CR(1));
+                writel(0, mtu_base + MTU_LR(1));
+                writel(cr | MTU_CRn_ENA, mtu_base + MTU_CR(1));
+                writel(0x2, mtu_base + MTU_IMSC);
+                break;
         case CLOCK_EVT_MODE_SHUTDOWN:
         case CLOCK_EVT_MODE_UNUSED:
-                writel(readl(mtu_base + MTU_IMSC) & ~1, mtu_base + MTU_IMSC);
+                /* disable irq */
+                writel(0, mtu_base + MTU_IMSC);
                 break;
         case CLOCK_EVT_MODE_RESUME:
                 break;
         }
 }
 
+static int nmdk_clkevt_next(unsigned long evt, struct clock_event_device *ev)
+{
+        /* writing the value has immediate effect */
+        writel(evt, mtu_base + MTU_LR(1));
+        return 0;
+}
+
 static struct clock_event_device nmdk_clkevt = {
-        .name           = "mtu_0",
-        .features       = CLOCK_EVT_FEAT_PERIODIC,
+        .name           = "mtu_1",
+        .features       = CLOCK_EVT_FEAT_ONESHOT,
         .shift          = 32,
-        .rating         = 100,
+        .rating         = 200,
         .set_mode       = nmdk_clkevt_mode,
+        .set_next_event = nmdk_clkevt_next,
 };
 
 /*
- * IRQ Handler for the timer 0 of the MTU block. The irq is not shared
- * as we are the only users of mtu0 by now.
+ * IRQ Handler for timer 1 of the MTU block.
  */
 static irqreturn_t nmdk_timer_interrupt(int irq, void *dev_id)
 {
-        /* ack: "interrupt clear register" */
-        writel(1 << 0, mtu_base + MTU_ICR);
-
-        /* we can't count lost ticks, unfortunately */
-        nmdk_count += nmdk_cycle;
-        nmdk_clkevt.event_handler(&nmdk_clkevt);
+        struct clock_event_device *evdev = dev_id;
 
+        writel(1 << 1, mtu_base + MTU_ICR); /* Interrupt clear reg */
+        evdev->event_handler(evdev);
         return IRQ_HANDLED;
 }
 
-/*
- * Set up timer interrupt, and return the current time in seconds.
- */
 static struct irqaction nmdk_timer_irq = {
         .name           = "Nomadik Timer Tick",
         .flags          = IRQF_DISABLED | IRQF_TIMER,
         .handler        = nmdk_timer_interrupt,
+        .dev_id         = &nmdk_clkevt,
 };
 
-static void nmdk_timer_reset(void)
-{
-        u32 cr;
-
-        writel(0, mtu_base + MTU_CR(0)); /* off */
-
-        /* configure load and background-load, and fire it up */
-        writel(nmdk_cycle, mtu_base + MTU_LR(0));
-        writel(nmdk_cycle, mtu_base + MTU_BGLR(0));
-        cr = MTU_CRn_PERIODIC | MTU_CRn_PRESCALE_1 | MTU_CRn_32BITS;
-        writel(cr, mtu_base + MTU_CR(0));
-        writel(cr | MTU_CRn_ENA, mtu_base + MTU_CR(0));
-}
-
 void __init nmdk_timer_init(void)
 {
         unsigned long rate;
-        int bits;
-
-        rate = CLOCK_TICK_RATE; /* 2.4MHz */
-        nmdk_cycle = (rate + HZ/2) / HZ;
+        u32 cr = MTU_CRn_32BITS;;
+
+        /*
+         * Tick rate is 2.4MHz for Nomadik and 110MHz for ux500:
+         * use a divide-by-16 counter if it's more than 16MHz
+         */
+        rate = CLOCK_TICK_RATE;
+        if (rate > 16 << 20) {
+                rate /= 16;
+                cr |= MTU_CRn_PRESCALE_16;
+        } else {
+                cr |= MTU_CRn_PRESCALE_1;
+        }
 
-        /* Init the timer and register clocksource */
-        nmdk_timer_reset();
+        /* Timer 0 is the free running clocksource */
+        writel(cr, mtu_base + MTU_CR(0));
+        writel(0, mtu_base + MTU_LR(0));
+        writel(0, mtu_base + MTU_BGLR(0));
+        writel(cr | MTU_CRn_ENA, mtu_base + MTU_CR(0));
 
         nmdk_clksrc.mult = clocksource_hz2mult(rate, nmdk_clksrc.shift);
-        bits =  8*sizeof(nmdk_count);
-        nmdk_clksrc.mask = CLOCKSOURCE_MASK(bits);
+        /* Now the scheduling clock is ready */
+        nmdk_clksrc.read = nmdk_read_timer;
 
         if (clocksource_register(&nmdk_clksrc))
-                printk(KERN_ERR "timer: failed to initialize clock "
-                        "source %s\n", nmdk_clksrc.name);
+                pr_err("timer: failed to initialize clock source %s\n",
+                       nmdk_clksrc.name);
+
+        /* Timer 1 is used for events, fix according to rate */
+        writel(cr | MTU_CRn_ONESHOT, mtu_base + MTU_CR(1)); /* off, currently */
+        nmdk_clkevt.mult = div_sc(rate, NSEC_PER_SEC, nmdk_clkevt.shift);
+        nmdk_clkevt.max_delta_ns =
+                clockevent_delta2ns(0xffffffff, &nmdk_clkevt);
+        nmdk_clkevt.min_delta_ns =
+                clockevent_delta2ns(0x00000002, &nmdk_clkevt);
+        nmdk_clkevt.cpumask     = cpumask_of(0);
 
         /* Register irq and clockevents */
         setup_irq(IRQ_MTU0, &nmdk_timer_irq);
-        nmdk_clkevt.mult = div_sc(rate, NSEC_PER_SEC, nmdk_clkevt.shift);
-        nmdk_clkevt.cpumask = cpumask_of(0);
         clockevents_register_device(&nmdk_clkevt);
 }