[RFC 4/5] clocksource: omap-timer: Introduce clocksource driver for OMAP SoCs
Joel Fernandes
joelf at TI.com
Thu Mar 13 16:35:18 EDT 2014
We introduce functions to initialize clocksource and clockevent, use
CLOCKSOURCE_OF_DECLARE to declare the clocksource, and handle the clocksource
selection on a per-SoC basis (Currently only AM335x is supported). Powering up
of the timer will be done with the help of the mach-omap layer function that's
introduced earlier in the series.
We make a local copy of dmtimer API for use by clocksource, the original
dmtimer API in plat-omap is kept as-is till the migration of all SoCs is
completed after which it can't be deleted.
Signed-off-by: Joel Fernandes <joelf at ti.com>
---
drivers/clocksource/Makefile | 1 +
drivers/clocksource/omap-timer.c | 1157 ++++++++++++++++++++++++++++++++++++++
drivers/clocksource/omap-timer.h | 422 ++++++++++++++
3 files changed, 1580 insertions(+)
create mode 100644 drivers/clocksource/omap-timer.c
create mode 100644 drivers/clocksource/omap-timer.h
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index c7ca50a..2ffe698 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -37,3 +37,4 @@ obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o
obj-$(CONFIG_ARM_GLOBAL_TIMER) += arm_global_timer.o
obj-$(CONFIG_CLKSRC_METAG_GENERIC) += metag_generic.o
obj-$(CONFIG_ARCH_HAS_TICK_BROADCAST) += dummy_timer.o
+obj-y += omap-timer.o
diff --git a/drivers/clocksource/omap-timer.c b/drivers/clocksource/omap-timer.c
new file mode 100644
index 0000000..91593d8
--- /dev/null
+++ b/drivers/clocksource/omap-timer.c
@@ -0,0 +1,1157 @@
+/*
+ * drivers/clocksource/omap-timer.c
+ *
+ * OMAP Dual-Mode Timers
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
+ * Joel Fernandes <joelf at ti.com>
+ * Tarun Kanti DebBarma <tarun.kanti at ti.com>
+ * Thara Gopinath <thara at ti.com>
+ *
+ * dmtimer adaptation to platform_driver.
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * OMAP2 support by Juha Yrjola
+ * API improvements and OMAP2 clock framework support by Timo Teras
+ *
+ * Copyright (C) 2014 Texas Instruments
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar at ti.com>
+ *
+ * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * 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.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/slab.h>
+#include <linux/sched_clock.h>
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/dmtimer-omap.h>
+#include "omap-timer.h"
+/*
+ * TODO: OMAP1 support removed due to need for header mach/hardware.h
+ * OMAP2 support may be broken due to lack of cpu_is stuff, see omap_dm_timer_get_errata
+ */
+
+/**
+ * omap_dm_timer_get_errata - get errata flags for a timer
+ *
+ * Get the timer errata flags that are specific to the OMAP device being used.
+ */
+static u32 __init omap_dm_timer_get_errata(void)
+{
+ /* ifdef'd out due to lack of availaibility of soc.h */
+#if 0
+ if (cpu_is_omap24xx())
+ return 0;
+#endif
+ return OMAP_TIMER_ERRATA_I103_I767;
+}
+
+
+/* Below code borrowed from plat-omap/dmtimer.c, everything static'd */
+
+static u32 omap_reserved_systimers;
+static LIST_HEAD(omap_timer_list);
+static DEFINE_SPINLOCK(dm_timer_lock);
+
+enum {
+ REQUEST_ANY = 0,
+ REQUEST_BY_ID,
+ REQUEST_BY_CAP,
+ REQUEST_BY_NODE,
+};
+
+/**
+ * omap_dm_timer_read_reg - read timer registers in posted and non-posted mode
+ * @timer: timer pointer over which read operation to perform
+ * @reg: lowest byte holds the register offset
+ *
+ * The posted mode bit is encoded in reg. Note that in posted mode write
+ * pending bit must be checked. Otherwise a read of a non completed write
+ * will produce an error.
+ */
+static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, u32 reg)
+{
+ WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET);
+ return __omap_dm_timer_read(timer, reg, timer->posted);
+}
+
+/**
+ * omap_dm_timer_write_reg - write timer registers in posted and non-posted mode
+ * @timer: timer pointer over which write operation is to perform
+ * @reg: lowest byte holds the register offset
+ * @value: data to write into the register
+ *
+ * The posted mode bit is encoded in reg. Note that in posted mode the write
+ * pending bit must be checked. Otherwise a write on a register which has a
+ * pending write will be lost.
+ */
+static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
+ u32 value)
+{
+ WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET);
+ __omap_dm_timer_write(timer, reg, value, timer->posted);
+}
+
+static void omap_timer_restore_context(struct omap_dm_timer *timer)
+{
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG,
+ timer->context.twer);
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG,
+ timer->context.tcrr);
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG,
+ timer->context.tldr);
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG,
+ timer->context.tmar);
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG,
+ timer->context.tsicr);
+ __raw_writel(timer->context.tier, timer->irq_ena);
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG,
+ timer->context.tclr);
+}
+
+static int omap_dm_timer_reset(struct omap_dm_timer *timer)
+{
+ u32 l, timeout = 100000;
+
+ if (timer->revision != 1)
+ return -EINVAL;
+
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
+
+ do {
+ l = __omap_dm_timer_read(timer,
+ OMAP_TIMER_V1_SYS_STAT_OFFSET, 0);
+ } while (!l && timeout--);
+
+ if (!timeout) {
+ dev_err(&timer->pdev->dev, "Timer failed to reset\n");
+ return -ETIMEDOUT;
+ }
+
+ /* Configure timer for smart-idle mode */
+ l = __omap_dm_timer_read(timer, OMAP_TIMER_OCP_CFG_OFFSET, 0);
+ l |= 0x2 << 0x3;
+ __omap_dm_timer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET, l, 0);
+
+ timer->posted = 0;
+
+ return 0;
+}
+
+static int omap_dm_timer_prepare(struct omap_dm_timer *timer)
+{
+ int rc;
+
+ /*
+ * FIXME: OMAP1 devices do not use the clock framework for dmtimers so
+ * do not call clk_get() for these devices.
+ */
+ if (!(timer->capability & OMAP_TIMER_NEEDS_RESET)) {
+ timer->fclk = clk_get(&timer->pdev->dev, "fck");
+ if (WARN_ON_ONCE(IS_ERR(timer->fclk))) {
+ dev_err(&timer->pdev->dev, ": No fclk handle.\n");
+ return -EINVAL;
+ }
+ }
+
+ omap_dm_timer_enable(timer);
+
+ if (timer->capability & OMAP_TIMER_NEEDS_RESET) {
+ rc = omap_dm_timer_reset(timer);
+ if (rc) {
+ omap_dm_timer_disable(timer);
+ return rc;
+ }
+ }
+
+ __omap_dm_timer_enable_posted(timer);
+ omap_dm_timer_disable(timer);
+
+ return omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
+}
+
+static inline u32 omap_dm_timer_reserved_systimer(int id)
+{
+ return (omap_reserved_systimers & (1 << (id - 1))) ? 1 : 0;
+}
+
+static int omap_dm_timer_reserve_systimer(int id)
+{
+ if (omap_dm_timer_reserved_systimer(id))
+ return -ENODEV;
+
+ omap_reserved_systimers |= (1 << (id - 1));
+
+ return 0;
+}
+
+static struct omap_dm_timer *_omap_dm_timer_request(int req_type, void *data)
+{
+ struct omap_dm_timer *timer = NULL, *t;
+ struct device_node *np = NULL;
+ unsigned long flags;
+ u32 cap = 0;
+ int id = 0;
+
+ switch (req_type) {
+ case REQUEST_BY_ID:
+ id = *(int *)data;
+ break;
+ case REQUEST_BY_CAP:
+ cap = *(u32 *)data;
+ break;
+ case REQUEST_BY_NODE:
+ np = (struct device_node *)data;
+ break;
+ default:
+ /* REQUEST_ANY */
+ break;
+ }
+
+ spin_lock_irqsave(&dm_timer_lock, flags);
+ list_for_each_entry(t, &omap_timer_list, node) {
+ if (t->reserved)
+ continue;
+
+ switch (req_type) {
+ case REQUEST_BY_ID:
+ if (id == t->pdev->id) {
+ timer = t;
+ timer->reserved = 1;
+ goto found;
+ }
+ break;
+ case REQUEST_BY_CAP:
+ if (cap == (t->capability & cap)) {
+ /*
+ * If timer is not NULL, we have already found
+ * one timer but it was not an exact match
+ * because it had more capabilites that what
+ * was required. Therefore, unreserve the last
+ * timer found and see if this one is a better
+ * match.
+ */
+ if (timer)
+ timer->reserved = 0;
+ timer = t;
+ timer->reserved = 1;
+
+ /* Exit loop early if we find an exact match */
+ if (t->capability == cap)
+ goto found;
+ }
+ break;
+ case REQUEST_BY_NODE:
+ if (np == t->pdev->dev.of_node) {
+ timer = t;
+ timer->reserved = 1;
+ goto found;
+ }
+ break;
+ default:
+ /* REQUEST_ANY */
+ timer = t;
+ timer->reserved = 1;
+ goto found;
+ }
+ }
+found:
+ spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+ if (timer && omap_dm_timer_prepare(timer)) {
+ timer->reserved = 0;
+ timer = NULL;
+ }
+
+ if (!timer)
+ pr_debug("%s: timer request failed!\n", __func__);
+
+ return timer;
+}
+
+static struct omap_dm_timer *omap_dm_timer_request(void)
+{
+ return _omap_dm_timer_request(REQUEST_ANY, NULL);
+}
+
+static struct omap_dm_timer *omap_dm_timer_request_specific(int id)
+{
+ /* Requesting timer by ID is not supported when device tree is used */
+ if (of_have_populated_dt()) {
+ pr_warn("%s: Please use omap_dm_timer_request_by_cap/node()\n",
+ __func__);
+ return NULL;
+ }
+
+ return _omap_dm_timer_request(REQUEST_BY_ID, &id);
+}
+
+/**
+ * omap_dm_timer_request_by_cap - Request a timer by capability
+ * @cap: Bit mask of capabilities to match
+ *
+ * Find a timer based upon capabilities bit mask. Callers of this function
+ * should use the definitions found in the plat/dmtimer.h file under the
+ * comment "timer capabilities used in hwmod database". Returns pointer to
+ * timer handle on success and a NULL pointer on failure.
+ */
+static struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap)
+{
+ return _omap_dm_timer_request(REQUEST_BY_CAP, &cap);
+}
+
+/**
+ * omap_dm_timer_request_by_node - Request a timer by device-tree node
+ * @np: Pointer to device-tree timer node
+ *
+ * Request a timer based upon a device node pointer. Returns pointer to
+ * timer handle on success and a NULL pointer on failure.
+ */
+static struct omap_dm_timer *omap_dm_timer_request_by_node(struct device_node *np)
+{
+ if (!np)
+ return NULL;
+
+ return _omap_dm_timer_request(REQUEST_BY_NODE, np);
+}
+
+static int omap_dm_timer_free(struct omap_dm_timer *timer)
+{
+ if (unlikely(!timer))
+ return -EINVAL;
+
+ clk_put(timer->fclk);
+
+ WARN_ON(!timer->reserved);
+ timer->reserved = 0;
+ return 0;
+}
+
+static void omap_dm_timer_enable(struct omap_dm_timer *timer)
+{
+ int c;
+
+ pm_runtime_get_sync(&timer->pdev->dev);
+
+ if (!(timer->capability & OMAP_TIMER_ALWON)) {
+ if (timer->get_context_loss_count) {
+ c = timer->get_context_loss_count(&timer->pdev->dev);
+ if (c != timer->ctx_loss_count) {
+ omap_timer_restore_context(timer);
+ timer->ctx_loss_count = c;
+ }
+ } else {
+ omap_timer_restore_context(timer);
+ }
+ }
+}
+
+static void omap_dm_timer_disable(struct omap_dm_timer *timer)
+{
+ pm_runtime_put_sync(&timer->pdev->dev);
+}
+
+static int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
+{
+ if (timer)
+ return timer->irq;
+ return -EINVAL;
+}
+
+static struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
+{
+ if (timer && !IS_ERR(timer->fclk))
+ return timer->fclk;
+ return NULL;
+}
+
+static __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
+{
+ BUG();
+
+ return 0;
+}
+
+static int omap_dm_timer_trigger(struct omap_dm_timer *timer)
+{
+ if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
+ pr_err("%s: timer not available or enabled.\n", __func__);
+ return -EINVAL;
+ }
+
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
+ return 0;
+}
+
+static int omap_dm_timer_start(struct omap_dm_timer *timer)
+{
+ u32 l;
+
+ if (unlikely(!timer))
+ return -EINVAL;
+
+ omap_dm_timer_enable(timer);
+
+ l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+ if (!(l & OMAP_TIMER_CTRL_ST)) {
+ l |= OMAP_TIMER_CTRL_ST;
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+ }
+
+ /* Save the context */
+ timer->context.tclr = l;
+ return 0;
+}
+
+static int omap_dm_timer_stop(struct omap_dm_timer *timer)
+{
+ unsigned long rate = 0;
+
+ if (unlikely(!timer))
+ return -EINVAL;
+
+ if (!(timer->capability & OMAP_TIMER_NEEDS_RESET))
+ rate = clk_get_rate(timer->fclk);
+
+ __omap_dm_timer_stop(timer, timer->posted, rate);
+
+ /*
+ * Since the register values are computed and written within
+ * __omap_dm_timer_stop, we need to use read to retrieve the
+ * context.
+ */
+ timer->context.tclr =
+ omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+ omap_dm_timer_disable(timer);
+ return 0;
+}
+
+static int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
+{
+ int ret;
+ char *parent_name = NULL;
+ struct clk *parent;
+ struct dmtimer_platform_data *pdata;
+
+ if (unlikely(!timer))
+ return -EINVAL;
+
+ pdata = timer->pdev->dev.platform_data;
+
+ if (source < 0 || source >= 3)
+ return -EINVAL;
+
+ /*
+ * FIXME: Used for OMAP1 devices only because they do not currently
+ * use the clock framework to set the parent clock. To be removed
+ * once OMAP1 migrated to using clock framework for dmtimers
+ */
+ if (pdata && pdata->set_timer_src)
+ return pdata->set_timer_src(timer->pdev, source);
+
+ if (IS_ERR(timer->fclk))
+ return -EINVAL;
+
+ switch (source) {
+ case OMAP_TIMER_SRC_SYS_CLK:
+ parent_name = "timer_sys_ck";
+ break;
+
+ case OMAP_TIMER_SRC_32_KHZ:
+ parent_name = "timer_32k_ck";
+ break;
+
+ case OMAP_TIMER_SRC_EXT_CLK:
+ parent_name = "timer_ext_ck";
+ break;
+ }
+
+ parent = clk_get(&timer->pdev->dev, parent_name);
+ if (IS_ERR(parent)) {
+ pr_err("%s: %s not found\n", __func__, parent_name);
+ return -EINVAL;
+ }
+
+ ret = clk_set_parent(timer->fclk, parent);
+ if (ret < 0)
+ pr_err("%s: failed to set %s as parent\n", __func__,
+ parent_name);
+
+ clk_put(parent);
+
+ return ret;
+}
+
+static int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
+ unsigned int load)
+{
+ u32 l;
+
+ if (unlikely(!timer))
+ return -EINVAL;
+
+ omap_dm_timer_enable(timer);
+ l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+ if (autoreload)
+ l |= OMAP_TIMER_CTRL_AR;
+ else
+ l &= ~OMAP_TIMER_CTRL_AR;
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
+
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
+ /* Save the context */
+ timer->context.tclr = l;
+ timer->context.tldr = load;
+ omap_dm_timer_disable(timer);
+ return 0;
+}
+
+/* Optimized set_load which removes costly spin wait in timer_start */
+static int omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload,
+ unsigned int load)
+{
+ u32 l;
+
+ if (unlikely(!timer))
+ return -EINVAL;
+
+ omap_dm_timer_enable(timer);
+
+ l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+ if (autoreload) {
+ l |= OMAP_TIMER_CTRL_AR;
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
+ } else {
+ l &= ~OMAP_TIMER_CTRL_AR;
+ }
+ l |= OMAP_TIMER_CTRL_ST;
+
+ __omap_dm_timer_load_start(timer, l, load, timer->posted);
+
+ /* Save the context */
+ timer->context.tclr = l;
+ timer->context.tldr = load;
+ timer->context.tcrr = load;
+ return 0;
+}
+
+static int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
+ unsigned int match)
+{
+ u32 l;
+
+ if (unlikely(!timer))
+ return -EINVAL;
+
+ omap_dm_timer_enable(timer);
+ l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+ if (enable)
+ l |= OMAP_TIMER_CTRL_CE;
+ else
+ l &= ~OMAP_TIMER_CTRL_CE;
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+
+ /* Save the context */
+ timer->context.tclr = l;
+ timer->context.tmar = match;
+ omap_dm_timer_disable(timer);
+ return 0;
+}
+
+static int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
+ int toggle, int trigger)
+{
+ u32 l;
+
+ if (unlikely(!timer))
+ return -EINVAL;
+
+ omap_dm_timer_enable(timer);
+ l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+ l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
+ OMAP_TIMER_CTRL_PT | (0x03 << 10));
+ if (def_on)
+ l |= OMAP_TIMER_CTRL_SCPWM;
+ if (toggle)
+ l |= OMAP_TIMER_CTRL_PT;
+ l |= trigger << 10;
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+
+ /* Save the context */
+ timer->context.tclr = l;
+ omap_dm_timer_disable(timer);
+ return 0;
+}
+
+static int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
+{
+ u32 l;
+
+ if (unlikely(!timer))
+ return -EINVAL;
+
+ omap_dm_timer_enable(timer);
+ l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+ l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
+ if (prescaler >= 0x00 && prescaler <= 0x07) {
+ l |= OMAP_TIMER_CTRL_PRE;
+ l |= prescaler << 2;
+ }
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+
+ /* Save the context */
+ timer->context.tclr = l;
+ omap_dm_timer_disable(timer);
+ return 0;
+}
+
+static int omp_dm_timer_set_int_enable(struct omap_dm_timer *timer,
+ unsigned int value)
+{
+ if (unlikely(!timer))
+ return -EINVAL;
+
+ omap_dm_timer_enable(timer);
+ __omap_dm_timer_int_enable(timer, value);
+
+ /* Save the context */
+ timer->context.tier = value;
+ timer->context.twer = value;
+ omap_dm_timer_disable(timer);
+ return 0;
+}
+
+/**
+ * omap_dm_timer_set_int_disable - disable timer interrupts
+ * @timer: pointer to timer handle
+ * @mask: bit mask of interrupts to be disabled
+ *
+ * Disables the specified timer interrupts for a timer.
+ */
+static int omap_dm_timer_set_int_disable(struct omap_dm_timer *timer, u32 mask)
+{
+ u32 l = mask;
+
+ if (unlikely(!timer))
+ return -EINVAL;
+
+ omap_dm_timer_enable(timer);
+
+ if (timer->revision == 1)
+ l = __raw_readl(timer->irq_ena) & ~mask;
+
+ __raw_writel(l, timer->irq_dis);
+ l = omap_dm_timer_read_reg(timer, OMAP_TIMER_WAKEUP_EN_REG) & ~mask;
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, l);
+
+ /* Save the context */
+ timer->context.tier &= ~mask;
+ timer->context.twer &= ~mask;
+ omap_dm_timer_disable(timer);
+ return 0;
+}
+
+static unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
+{
+ unsigned int l;
+
+ if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
+ pr_err("%s: timer not available or enabled.\n", __func__);
+ return 0;
+ }
+
+ l = __raw_readl(timer->irq_stat);
+
+ return l;
+}
+
+static int omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
+{
+ if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev)))
+ return -EINVAL;
+
+ __omap_dm_timer_write_status(timer, value);
+
+ return 0;
+}
+
+static unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
+{
+ if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
+ pr_err("%s: timer not iavailable or enabled.\n", __func__);
+ return 0;
+ }
+
+ return __omap_dm_timer_read_counter(timer, timer->posted);
+}
+
+static int omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
+{
+ if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
+ pr_err("%s: timer not available or enabled.\n", __func__);
+ return -EINVAL;
+ }
+
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
+
+ /* Save the context */
+ timer->context.tcrr = value;
+ return 0;
+}
+
+static int omap_dm_timers_active(void)
+{
+ struct omap_dm_timer *timer;
+
+ list_for_each_entry(timer, &omap_timer_list, node) {
+ if (!timer->reserved)
+ continue;
+
+ if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
+ OMAP_TIMER_CTRL_ST) {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static const struct of_device_id omap_timer_match[];
+
+/**
+ * omap_dm_timer_probe - probe function called for every registered device
+ * @pdev: pointer to current timer platform device
+ *
+ * Called by driver framework at the end of device registration for all
+ * timer devices.
+ */
+static int omap_dm_timer_probe(struct platform_device *pdev)
+{
+ unsigned long flags;
+ struct omap_dm_timer *timer;
+ struct resource *mem, *irq;
+ struct device *dev = &pdev->dev;
+ const struct of_device_id *match;
+ const struct dmtimer_platform_data *pdata;
+
+ match = of_match_device(of_match_ptr(omap_timer_match), dev);
+ pdata = match ? match->data : dev->platform_data;
+
+ if (!pdata && !dev->of_node) {
+ dev_err(dev, "%s: no platform data.\n", __func__);
+ return -ENODEV;
+ }
+
+ irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (unlikely(!irq)) {
+ dev_err(dev, "%s: no IRQ resource.\n", __func__);
+ return -ENODEV;
+ }
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (unlikely(!mem)) {
+ dev_err(dev, "%s: no memory resource.\n", __func__);
+ return -ENODEV;
+ }
+
+ timer = devm_kzalloc(dev, sizeof(struct omap_dm_timer), GFP_KERNEL);
+ if (!timer) {
+ dev_err(dev, "%s: memory alloc failed!\n", __func__);
+ return -ENOMEM;
+ }
+
+ timer->fclk = ERR_PTR(-ENODEV);
+ timer->io_base = devm_ioremap_resource(dev, mem);
+ if (IS_ERR(timer->io_base))
+ return PTR_ERR(timer->io_base);
+
+ if (dev->of_node) {
+ if (of_find_property(dev->of_node, "ti,timer-alwon", NULL))
+ timer->capability |= OMAP_TIMER_ALWON;
+ if (of_find_property(dev->of_node, "ti,timer-dsp", NULL))
+ timer->capability |= OMAP_TIMER_HAS_DSP_IRQ;
+ if (of_find_property(dev->of_node, "ti,timer-pwm", NULL))
+ timer->capability |= OMAP_TIMER_HAS_PWM;
+ if (of_find_property(dev->of_node, "ti,timer-secure", NULL))
+ timer->capability |= OMAP_TIMER_SECURE;
+ } else {
+ timer->id = pdev->id;
+ timer->capability = pdata->timer_capability;
+ timer->reserved = omap_dm_timer_reserved_systimer(timer->id);
+ timer->get_context_loss_count = pdata->get_context_loss_count;
+ }
+
+ if (pdata)
+ timer->errata = pdata->timer_errata;
+
+ timer->irq = irq->start;
+ timer->pdev = pdev;
+
+ /* Skip pm_runtime_enable for OMAP1 */
+ if (!(timer->capability & OMAP_TIMER_NEEDS_RESET)) {
+ pm_runtime_enable(dev);
+ pm_runtime_irq_safe(dev);
+ }
+
+ if (!timer->reserved) {
+ pm_runtime_get_sync(dev);
+ __omap_dm_timer_init_regs(timer);
+ pm_runtime_put(dev);
+ }
+
+ /* add the timer element to the list */
+ spin_lock_irqsave(&dm_timer_lock, flags);
+ list_add_tail(&timer->node, &omap_timer_list);
+ spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+ dev_dbg(dev, "Device Probed.\n");
+
+ return 0;
+}
+
+/**
+ * omap_dm_timer_remove - cleanup a registered timer device
+ * @pdev: pointer to current timer platform device
+ *
+ * Called by driver framework whenever a timer device is unregistered.
+ * In addition to freeing platform resources it also deletes the timer
+ * entry from the local list.
+ */
+static int omap_dm_timer_remove(struct platform_device *pdev)
+{
+ struct omap_dm_timer *timer;
+ unsigned long flags;
+ int ret = -EINVAL;
+
+ spin_lock_irqsave(&dm_timer_lock, flags);
+ list_for_each_entry(timer, &omap_timer_list, node)
+ if (!strcmp(dev_name(&timer->pdev->dev),
+ dev_name(&pdev->dev))) {
+ list_del(&timer->node);
+ ret = 0;
+ break;
+ }
+ spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+ return ret;
+}
+
+/* Right now I am only trying to make system timers work
+ in the scheme of things, so disable any post-early boot
+ stuff till then */
+
+#if 0
+static const struct dmtimer_platform_data omap3plus_pdata = {
+ .timer_errata = OMAP_TIMER_ERRATA_I103_I767,
+};
+
+static const struct of_device_id omap_timer_match[] = {
+ {
+ .compatible = "ti,omap2420-timer",
+ },
+ {
+ .compatible = "ti,omap3430-timer",
+ .data = &omap3plus_pdata,
+ },
+ {
+ .compatible = "ti,omap4430-timer",
+ .data = &omap3plus_pdata,
+ },
+ {
+ .compatible = "ti,omap5430-timer",
+ .data = &omap3plus_pdata,
+ },
+ {
+ .compatible = "ti,am335x-timer",
+ .data = &omap3plus_pdata,
+ },
+ {
+ .compatible = "ti,am335x-timer-1ms",
+ .data = &omap3plus_pdata,
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, omap_timer_match);
+
+static struct platform_driver omap_dm_timer_driver = {
+ .probe = omap_dm_timer_probe,
+ .remove = omap_dm_timer_remove,
+ .driver = {
+ .name = "omap_timer",
+ .of_match_table = of_match_ptr(omap_timer_match),
+ },
+};
+
+early_platform_init("earlytimer", &omap_dm_timer_driver);
+module_platform_driver(omap_dm_timer_driver);
+
+MODULE_DESCRIPTION("OMAP Dual-Mode Timer Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);
+MODULE_AUTHOR("Texas Instruments Inc");
+
+#endif
+
+/* Below code borrowed some bits from mach-omap2/timer.c */
+
+int __init omap_dmtimer_powerup(struct omap_dm_timer *timer,
+ struct device_node *np);
+
+
+/* Clockevent code */
+static struct omap_dm_timer clkev;
+
+
+/* Clock event functions */
+static int omap2_gp_timer_set_next_event(unsigned long cycles,
+ struct clock_event_device *evt)
+{
+ __omap_dm_timer_load_start(&clkev, OMAP_TIMER_CTRL_ST,
+ 0xffffffff - cycles, OMAP_TIMER_POSTED);
+
+ return 0;
+}
+
+static void omap2_gp_timer_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt)
+{
+ u32 period;
+
+ __omap_dm_timer_stop(&clkev, OMAP_TIMER_POSTED, clkev.rate);
+
+ switch (mode) {
+ case CLOCK_EVT_MODE_PERIODIC:
+ period = clkev.rate / HZ;
+ period -= 1;
+ /* Looks like we need to first set the load value separately */
+ __omap_dm_timer_write(&clkev, OMAP_TIMER_LOAD_REG,
+ 0xffffffff - period, OMAP_TIMER_POSTED);
+ __omap_dm_timer_load_start(&clkev,
+ OMAP_TIMER_CTRL_AR | OMAP_TIMER_CTRL_ST,
+ 0xffffffff - period, OMAP_TIMER_POSTED);
+ break;
+ case CLOCK_EVT_MODE_ONESHOT:
+ break;
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ case CLOCK_EVT_MODE_RESUME:
+ break;
+ }
+}
+
+
+static struct clock_event_device clockevent_gpt = {
+ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+ .rating = 300,
+ .set_next_event = omap2_gp_timer_set_next_event,
+ .set_mode = omap2_gp_timer_set_mode,
+};
+
+static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id)
+{
+ struct clock_event_device *evt = &clockevent_gpt;
+
+ __omap_dm_timer_write_status(&clkev, OMAP_TIMER_INT_OVERFLOW);
+
+ evt->event_handler(evt);
+ return IRQ_HANDLED;
+}
+
+static struct irqaction omap2_gp_timer_irq = {
+ .name = "gp_timer",
+ .flags = IRQF_TIMER | IRQF_IRQPOLL,
+ .handler = omap2_gp_timer_interrupt,
+};
+
+
+/* Clock source functions */
+static struct omap_dm_timer clksrc;
+
+static cycle_t clocksource_read_cycles(struct clocksource *cs)
+{
+ return (cycle_t)__omap_dm_timer_read_counter(&clksrc,
+ OMAP_TIMER_NONPOSTED);
+}
+
+static struct clocksource clocksource_gpt = {
+ .rating = 300,
+ .read = clocksource_read_cycles,
+ .mask = CLOCKSOURCE_MASK(32),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static u64 notrace dmtimer_read_sched_clock(void)
+{
+ if (clksrc.reserved)
+ return __omap_dm_timer_read_counter(&clksrc,
+ OMAP_TIMER_NONPOSTED);
+
+ return 0;
+}
+
+static int __init omap_dmtimer_init_one(struct omap_dm_timer *timer,
+ struct device_node *np,
+ int posted)
+{
+ timer->irq = irq_of_parse_and_map(np, 0);
+ if (!timer->irq)
+ return -ENXIO;
+
+ timer->io_base = of_iomap(np, 0);
+ if (!timer->io_base)
+ return -ENXIO;
+
+ __omap_dm_timer_init_regs(timer);
+
+ if (posted)
+ __omap_dm_timer_enable_posted(timer);
+
+ /* Check that the intended posted configuration matches the actual */
+ if (posted != timer->posted)
+ return -EINVAL;
+
+ timer->rate = clk_get_rate(timer->fclk);
+ timer->reserved = 1;
+
+ return 0;
+}
+
+static int __init omap_clockevent_init(struct device_node *np)
+{
+ int res;
+
+ clkev.errata = omap_dm_timer_get_errata();
+
+ /*
+ * For clock-event timers we never read the timer counter and
+ * so we are not impacted by errata i103 and i767. Therefore,
+ * we can safely ignore this errata for clock-event timers.
+ */
+ __omap_dm_timer_override_errata(&clkev, OMAP_TIMER_ERRATA_I103_I767);
+
+ clockevent_gpt.name = "timer_clkev";
+
+ res = omap_dmtimer_init_one(&clkev, np, OMAP_TIMER_POSTED);
+ if (res)
+ return res;
+
+ omap2_gp_timer_irq.dev_id = &clkev;
+ setup_irq(clkev.irq, &omap2_gp_timer_irq);
+
+ __omap_dm_timer_int_enable(&clkev, OMAP_TIMER_INT_OVERFLOW);
+
+ clockevent_gpt.cpumask = cpu_possible_mask;
+ clockevent_gpt.irq = omap_dm_timer_get_irq(&clkev);
+ clockevents_config_and_register(&clockevent_gpt, clkev.rate,
+ 3, /* Timer internal resynch latency */
+ 0xffffffff);
+
+ pr_info("OMAP clockevent source: %s at %lu Hz\n", clockevent_gpt.name,
+ clkev.rate);
+ return 0;
+}
+
+static int __init omap_clocksource_init(struct device_node *np)
+{
+ int res = 0;
+
+ clksrc.errata = omap_dm_timer_get_errata();
+
+ if (strlen(np->name) > 7) {
+ pr_err("%s: OF node name too big\n", __func__);
+ return -ENODEV;
+ }
+ clocksource_gpt.name = "timer_clksrc";
+
+ res = omap_dmtimer_init_one(&clksrc, np, OMAP_TIMER_NONPOSTED);
+ if (res)
+ return res;
+
+ __omap_dm_timer_load_start(&clksrc,
+ OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0,
+ OMAP_TIMER_NONPOSTED);
+ setup_sched_clock(dmtimer_read_sched_clock, 32, clksrc.rate);
+
+ res = clocksource_register_hz(&clocksource_gpt, clksrc.rate);
+ if (res) {
+ pr_err("Could not register clocksource %s\n",
+ clocksource_gpt.name);
+ return res;
+ } else {
+ pr_info("OMAP clocksource: %s at %lu Hz\n",
+ clocksource_gpt.name, clksrc.rate);
+ }
+ return 0;
+}
+
+static int reg_clksrc;
+static int reg_clkev;
+
+static struct property device_disabled = {
+ .name = "status",
+ .length = sizeof("disabled"),
+ .value = "disabled",
+};
+
+static void __init am33xx_clocksource_init(struct device_node *np)
+{
+ if (!reg_clksrc) {
+ if (of_get_property(np, "ti,timer-alwon", NULL)) {
+ omap_dmtimer_powerup(&clksrc, np);
+ clksrc.fclk = of_clk_get(np, 0);
+ omap_clocksource_init(np);
+ of_add_property(np, &device_disabled);
+ reg_clksrc = 1;
+ return;
+ }
+ }
+
+ if (!reg_clkev) {
+ omap_dmtimer_powerup(&clkev, np);
+ clkev.fclk = of_clk_get(np, 0);
+ omap_clockevent_init(np);
+ of_add_property(np, &device_disabled);
+ reg_clkev = 1;
+ }
+}
+
+CLOCKSOURCE_OF_DECLARE(am33xx_timer_1ms, "ti,am335x-timer-1ms",
+ am33xx_clocksource_init);
+CLOCKSOURCE_OF_DECLARE(am33xx_timer, "ti,am335x-timer",
+ am33xx_clocksource_init);
diff --git a/drivers/clocksource/omap-timer.h b/drivers/clocksource/omap-timer.h
new file mode 100644
index 0000000..dd85c52
--- /dev/null
+++ b/drivers/clocksource/omap-timer.h
@@ -0,0 +1,422 @@
+/*
+ * drivers/clocksource/omap-timer.h
+ *
+ * OMAP Dual-Mode Timers
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
+ * Joel Fernandes <joelf at ti.com>
+ * Tarun Kanti DebBarma <tarun.kanti at ti.com>
+ * Thara Gopinath <thara at ti.com>
+ *
+ * Platform device conversion and hwmod support.
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * Author: Lauri Leukkunen <lauri.leukkunen at nokia.com>
+ * PWM and clock framwork support by Timo Teras.
+ *
+ * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * 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.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+
+#ifndef __OMAP_TIMER_H
+#define __OMAP_TIMER_H
+
+/* clock sources */
+#define OMAP_TIMER_SRC_SYS_CLK 0x00
+#define OMAP_TIMER_SRC_32_KHZ 0x01
+#define OMAP_TIMER_SRC_EXT_CLK 0x02
+
+/* timer interrupt enable bits */
+#define OMAP_TIMER_INT_CAPTURE (1 << 2)
+#define OMAP_TIMER_INT_OVERFLOW (1 << 1)
+#define OMAP_TIMER_INT_MATCH (1 << 0)
+
+/* trigger types */
+#define OMAP_TIMER_TRIGGER_NONE 0x00
+#define OMAP_TIMER_TRIGGER_OVERFLOW 0x01
+#define OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE 0x02
+
+/* posted mode types */
+#define OMAP_TIMER_NONPOSTED 0x00
+#define OMAP_TIMER_POSTED 0x01
+
+/* timer capabilities used in hwmod database */
+#define OMAP_TIMER_SECURE 0x80000000
+#define OMAP_TIMER_ALWON 0x40000000
+#define OMAP_TIMER_HAS_PWM 0x20000000
+#define OMAP_TIMER_NEEDS_RESET 0x10000000
+#define OMAP_TIMER_HAS_DSP_IRQ 0x08000000
+
+/*
+ * timer errata flags
+ *
+ * Errata i103/i767 impacts all OMAP3/4/5 devices including AM33xx. This
+ * errata prevents us from using posted mode on these devices, unless the
+ * timer counter register is never read. For more details please refer to
+ * the OMAP3/4/5 errata documents.
+ */
+#define OMAP_TIMER_ERRATA_I103_I767 0x80000000
+
+struct omap_timer_capability_dev_attr {
+ u32 timer_capability;
+};
+
+struct timer_regs {
+ u32 tidr;
+ u32 tier;
+ u32 twer;
+ u32 tclr;
+ u32 tcrr;
+ u32 tldr;
+ u32 ttrg;
+ u32 twps;
+ u32 tmar;
+ u32 tcar1;
+ u32 tsicr;
+ u32 tcar2;
+ u32 tpir;
+ u32 tnir;
+ u32 tcvr;
+ u32 tocr;
+ u32 towr;
+};
+
+struct omap_dm_timer {
+ int id;
+ int irq;
+ struct clk *fclk;
+
+ void __iomem *io_base;
+ void __iomem *irq_stat; /* TISR/IRQSTATUS interrupt status */
+ void __iomem *irq_ena; /* irq enable */
+ void __iomem *irq_dis; /* irq disable, only on v2 ip */
+ void __iomem *pend; /* write pending */
+ void __iomem *func_base; /* function register base */
+
+ unsigned long rate;
+ unsigned reserved:1;
+ unsigned posted:1;
+ struct timer_regs context;
+ int (*get_context_loss_count)(struct device *);
+ int ctx_loss_count;
+ int revision;
+ u32 capability;
+ u32 errata;
+ struct platform_device *pdev;
+ struct list_head node;
+};
+
+static int omap_dm_timer_reserve_systimer(int id);
+static struct omap_dm_timer *omap_dm_timer_request(void);
+static struct omap_dm_timer *omap_dm_timer_request_specific(int timer_id);
+static struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap);
+static struct omap_dm_timer *omap_dm_timer_request_by_node(struct device_node *np);
+static int omap_dm_timer_free(struct omap_dm_timer *timer);
+static void omap_dm_timer_enable(struct omap_dm_timer *timer);
+static void omap_dm_timer_disable(struct omap_dm_timer *timer);
+
+static int omap_dm_timer_get_irq(struct omap_dm_timer *timer);
+
+static u32 omap_dm_timer_modify_idlect_mask(u32 inputmask);
+static struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer);
+
+static int omap_dm_timer_trigger(struct omap_dm_timer *timer);
+static int omap_dm_timer_start(struct omap_dm_timer *timer);
+static int omap_dm_timer_stop(struct omap_dm_timer *timer);
+
+static int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source);
+static int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, unsigned int value);
+static int omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload, unsigned int value);
+static int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, unsigned int match);
+static int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, int toggle, int trigger);
+static int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler);
+
+static int omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
+ unsigned int value);
+static int omap_dm_timer_set_int_disable(struct omap_dm_timer *timer, u32 mask);
+
+static unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer);
+static int omap_dm_timer_write_status(struct omap_dm_timer *timer,
+ unsigned int value);
+static unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer);
+static int omap_dm_timer_write_counter(struct omap_dm_timer *timer,
+ unsigned int value);
+
+static int omap_dm_timers_active(void);
+
+/*
+ * Do not use the defines below, they are not needed. They should be only
+ * used by dmtimer.c and sys_timer related code.
+ */
+
+/*
+ * The interrupt registers are different between v1 and v2 ip.
+ * These registers are offsets from timer->iobase.
+ */
+#define OMAP_TIMER_ID_OFFSET 0x00
+#define OMAP_TIMER_OCP_CFG_OFFSET 0x10
+
+#define OMAP_TIMER_V1_SYS_STAT_OFFSET 0x14
+#define OMAP_TIMER_V1_STAT_OFFSET 0x18
+#define OMAP_TIMER_V1_INT_EN_OFFSET 0x1c
+
+#define OMAP_TIMER_V2_IRQSTATUS_RAW 0x24
+#define OMAP_TIMER_V2_IRQSTATUS 0x28
+#define OMAP_TIMER_V2_IRQENABLE_SET 0x2c
+#define OMAP_TIMER_V2_IRQENABLE_CLR 0x30
+
+/*
+ * The functional registers have a different base on v1 and v2 ip.
+ * These registers are offsets from timer->func_base. The func_base
+ * is samae as io_base for v1 and io_base + 0x14 for v2 ip.
+ *
+ */
+#define OMAP_TIMER_V2_FUNC_OFFSET 0x14
+
+#define _OMAP_TIMER_WAKEUP_EN_OFFSET 0x20
+#define _OMAP_TIMER_CTRL_OFFSET 0x24
+#define OMAP_TIMER_CTRL_GPOCFG (1 << 14)
+#define OMAP_TIMER_CTRL_CAPTMODE (1 << 13)
+#define OMAP_TIMER_CTRL_PT (1 << 12)
+#define OMAP_TIMER_CTRL_TCM_LOWTOHIGH (0x1 << 8)
+#define OMAP_TIMER_CTRL_TCM_HIGHTOLOW (0x2 << 8)
+#define OMAP_TIMER_CTRL_TCM_BOTHEDGES (0x3 << 8)
+#define OMAP_TIMER_CTRL_SCPWM (1 << 7)
+#define OMAP_TIMER_CTRL_CE (1 << 6) /* compare enable */
+#define OMAP_TIMER_CTRL_PRE (1 << 5) /* prescaler enable */
+#define OMAP_TIMER_CTRL_PTV_SHIFT 2 /* prescaler value shift */
+#define OMAP_TIMER_CTRL_POSTED (1 << 2)
+#define OMAP_TIMER_CTRL_AR (1 << 1) /* autoreload enable */
+#define OMAP_TIMER_CTRL_ST (1 << 0) /* start timer */
+#define _OMAP_TIMER_COUNTER_OFFSET 0x28
+#define _OMAP_TIMER_LOAD_OFFSET 0x2c
+#define _OMAP_TIMER_TRIGGER_OFFSET 0x30
+#define _OMAP_TIMER_WRITE_PEND_OFFSET 0x34
+#define WP_NONE 0 /* no write pending bit */
+#define WP_TCLR (1 << 0)
+#define WP_TCRR (1 << 1)
+#define WP_TLDR (1 << 2)
+#define WP_TTGR (1 << 3)
+#define WP_TMAR (1 << 4)
+#define WP_TPIR (1 << 5)
+#define WP_TNIR (1 << 6)
+#define WP_TCVR (1 << 7)
+#define WP_TOCR (1 << 8)
+#define WP_TOWR (1 << 9)
+#define _OMAP_TIMER_MATCH_OFFSET 0x38
+#define _OMAP_TIMER_CAPTURE_OFFSET 0x3c
+#define _OMAP_TIMER_IF_CTRL_OFFSET 0x40
+#define _OMAP_TIMER_CAPTURE2_OFFSET 0x44 /* TCAR2, 34xx only */
+#define _OMAP_TIMER_TICK_POS_OFFSET 0x48 /* TPIR, 34xx only */
+#define _OMAP_TIMER_TICK_NEG_OFFSET 0x4c /* TNIR, 34xx only */
+#define _OMAP_TIMER_TICK_COUNT_OFFSET 0x50 /* TCVR, 34xx only */
+#define _OMAP_TIMER_TICK_INT_MASK_SET_OFFSET 0x54 /* TOCR, 34xx only */
+#define _OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET 0x58 /* TOWR, 34xx only */
+
+/* register offsets with the write pending bit encoded */
+#define WPSHIFT 16
+
+#define OMAP_TIMER_WAKEUP_EN_REG (_OMAP_TIMER_WAKEUP_EN_OFFSET \
+ | (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_CTRL_REG (_OMAP_TIMER_CTRL_OFFSET \
+ | (WP_TCLR << WPSHIFT))
+
+#define OMAP_TIMER_COUNTER_REG (_OMAP_TIMER_COUNTER_OFFSET \
+ | (WP_TCRR << WPSHIFT))
+
+#define OMAP_TIMER_LOAD_REG (_OMAP_TIMER_LOAD_OFFSET \
+ | (WP_TLDR << WPSHIFT))
+
+#define OMAP_TIMER_TRIGGER_REG (_OMAP_TIMER_TRIGGER_OFFSET \
+ | (WP_TTGR << WPSHIFT))
+
+#define OMAP_TIMER_WRITE_PEND_REG (_OMAP_TIMER_WRITE_PEND_OFFSET \
+ | (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_MATCH_REG (_OMAP_TIMER_MATCH_OFFSET \
+ | (WP_TMAR << WPSHIFT))
+
+#define OMAP_TIMER_CAPTURE_REG (_OMAP_TIMER_CAPTURE_OFFSET \
+ | (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_IF_CTRL_REG (_OMAP_TIMER_IF_CTRL_OFFSET \
+ | (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_CAPTURE2_REG (_OMAP_TIMER_CAPTURE2_OFFSET \
+ | (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_TICK_POS_REG (_OMAP_TIMER_TICK_POS_OFFSET \
+ | (WP_TPIR << WPSHIFT))
+
+#define OMAP_TIMER_TICK_NEG_REG (_OMAP_TIMER_TICK_NEG_OFFSET \
+ | (WP_TNIR << WPSHIFT))
+
+#define OMAP_TIMER_TICK_COUNT_REG (_OMAP_TIMER_TICK_COUNT_OFFSET \
+ | (WP_TCVR << WPSHIFT))
+
+#define OMAP_TIMER_TICK_INT_MASK_SET_REG \
+ (_OMAP_TIMER_TICK_INT_MASK_SET_OFFSET | (WP_TOCR << WPSHIFT))
+
+#define OMAP_TIMER_TICK_INT_MASK_COUNT_REG \
+ (_OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET | (WP_TOWR << WPSHIFT))
+
+static inline u32 __omap_dm_timer_read(struct omap_dm_timer *timer, u32 reg,
+ int posted)
+{
+ if (posted)
+ while (__raw_readl(timer->pend) & (reg >> WPSHIFT))
+ cpu_relax();
+
+ return __raw_readl(timer->func_base + (reg & 0xff));
+}
+
+static inline void __omap_dm_timer_write(struct omap_dm_timer *timer,
+ u32 reg, u32 val, int posted)
+{
+ if (posted)
+ while (__raw_readl(timer->pend) & (reg >> WPSHIFT))
+ cpu_relax();
+
+ __raw_writel(val, timer->func_base + (reg & 0xff));
+}
+
+static inline void __omap_dm_timer_init_regs(struct omap_dm_timer *timer)
+{
+ u32 tidr;
+
+ /* Assume v1 ip if bits [31:16] are zero */
+ tidr = __raw_readl(timer->io_base);
+ if (!(tidr >> 16)) {
+ timer->revision = 1;
+ timer->irq_stat = timer->io_base + OMAP_TIMER_V1_STAT_OFFSET;
+ timer->irq_ena = timer->io_base + OMAP_TIMER_V1_INT_EN_OFFSET;
+ timer->irq_dis = timer->io_base + OMAP_TIMER_V1_INT_EN_OFFSET;
+ timer->pend = timer->io_base + _OMAP_TIMER_WRITE_PEND_OFFSET;
+ timer->func_base = timer->io_base;
+ } else {
+ timer->revision = 2;
+ timer->irq_stat = timer->io_base + OMAP_TIMER_V2_IRQSTATUS;
+ timer->irq_ena = timer->io_base + OMAP_TIMER_V2_IRQENABLE_SET;
+ timer->irq_dis = timer->io_base + OMAP_TIMER_V2_IRQENABLE_CLR;
+ timer->pend = timer->io_base +
+ _OMAP_TIMER_WRITE_PEND_OFFSET +
+ OMAP_TIMER_V2_FUNC_OFFSET;
+ timer->func_base = timer->io_base + OMAP_TIMER_V2_FUNC_OFFSET;
+ }
+}
+
+/*
+ * __omap_dm_timer_enable_posted - enables write posted mode
+ * @timer: pointer to timer instance handle
+ *
+ * Enables the write posted mode for the timer. When posted mode is enabled
+ * writes to certain timer registers are immediately acknowledged by the
+ * internal bus and hence prevents stalling the CPU waiting for the write to
+ * complete. Enabling this feature can improve performance for writing to the
+ * timer registers.
+ */
+static inline void __omap_dm_timer_enable_posted(struct omap_dm_timer *timer)
+{
+ if (timer->posted)
+ return;
+
+ if (timer->errata & OMAP_TIMER_ERRATA_I103_I767) {
+ timer->posted = OMAP_TIMER_NONPOSTED;
+ __omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG, 0, 0);
+ return;
+ }
+
+ __omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG,
+ OMAP_TIMER_CTRL_POSTED, 0);
+ timer->context.tsicr = OMAP_TIMER_CTRL_POSTED;
+ timer->posted = OMAP_TIMER_POSTED;
+}
+
+/**
+ * __omap_dm_timer_override_errata - override errata flags for a timer
+ * @timer: pointer to timer handle
+ * @errata: errata flags to be ignored
+ *
+ * For a given timer, override a timer errata by clearing the flags
+ * specified by the errata argument. A specific erratum should only be
+ * overridden for a timer if the timer is used in such a way the erratum
+ * has no impact.
+ */
+static inline void __omap_dm_timer_override_errata(struct omap_dm_timer *timer,
+ u32 errata)
+{
+ timer->errata &= ~errata;
+}
+
+static inline void __omap_dm_timer_stop(struct omap_dm_timer *timer,
+ int posted, unsigned long rate)
+{
+ u32 l;
+
+ l = __omap_dm_timer_read(timer, OMAP_TIMER_CTRL_REG, posted);
+ if (l & OMAP_TIMER_CTRL_ST) {
+ l &= ~0x1;
+ __omap_dm_timer_write(timer, OMAP_TIMER_CTRL_REG, l, posted);
+#ifdef CONFIG_ARCH_OMAP2PLUS
+ /* Readback to make sure write has completed */
+ __omap_dm_timer_read(timer, OMAP_TIMER_CTRL_REG, posted);
+ /*
+ * Wait for functional clock period x 3.5 to make sure that
+ * timer is stopped
+ */
+ udelay(3500000 / rate + 1);
+#endif
+ }
+
+ /* Ack possibly pending interrupt */
+ __raw_writel(OMAP_TIMER_INT_OVERFLOW, timer->irq_stat);
+}
+
+static inline void __omap_dm_timer_load_start(struct omap_dm_timer *timer,
+ u32 ctrl, unsigned int load,
+ int posted)
+{
+ __omap_dm_timer_write(timer, OMAP_TIMER_COUNTER_REG, load, posted);
+ __omap_dm_timer_write(timer, OMAP_TIMER_CTRL_REG, ctrl, posted);
+}
+
+static inline void __omap_dm_timer_int_enable(struct omap_dm_timer *timer,
+ unsigned int value)
+{
+ __raw_writel(value, timer->irq_ena);
+ __omap_dm_timer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, value, 0);
+}
+
+static inline unsigned int
+__omap_dm_timer_read_counter(struct omap_dm_timer *timer, int posted)
+{
+ return __omap_dm_timer_read(timer, OMAP_TIMER_COUNTER_REG, posted);
+}
+
+static inline void __omap_dm_timer_write_status(struct omap_dm_timer *timer,
+ unsigned int value)
+{
+ __raw_writel(value, timer->irq_stat);
+}
+
+#endif /* __OMAP_TIMER_H */
--
1.7.9.5
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