linux_dsm_epyc7002/drivers/clocksource/timer-ti-dm.c
Tony Lindgren 9bd34c63f5 bus: ti-sysc: Fix timer handling with drop pm_runtime_irq_safe()
Commit 84badc5ec5 ("ARM: dts: omap4: Move l4 child devices to probe
them with ti-sysc") started producing a warning for pwm-omap-dmtimer:

WARNING: CPU: 0 PID: 77 at drivers/bus/omap_l3_noc.c:147
l3_interrupt_handler+0x2f8/0x388
44000000.ocp:L3 Custom Error: MASTER MPU TARGET L4PER2 (Idle):
Data Access in Supervisor mode during Functional access
...
__pm_runtime_idle
omap_dm_timer_disable
pwm_omap_dmtimer_start
pwm_omap_dmtimer_enable
pwm_apply_state
pwm_vibrator_start
pwm_vibrator_play_work

This is because the timer that pwm-omap-dmtimer is using is now being
probed with ti-sysc interconnect target module instead of omap_device
and the ti-sysc quirk for SYSC_QUIRK_LEGACY_IDLE is not fully
compatible with what omap_device has been doing.

We could fix this by reverting the timer changes and have the timer
probe again with omap_device. Or we could add more quirk handling to
ti-sysc driver. But as these options don't work nicely as longer term
solutions, let's just make timers probe with ti-sysc without any
quirks.

To do this, all we need to do is remove quirks for timers for ti-sysc,
and drop the bogus pm_runtime_irq_safe() flag for timer-ti-dm.

We should not use pm_runtime_irq_safe() anyways for drivers as it will
take a permanent use count on the parent device blocking the parent
devices from idling and has been forcing ti-sysc driver to use a
quirk flag.

Note that we will move the timer data to DEBUG section later on in
clean-up patches.

Fixes: 84badc5ec5 ("ARM: dts: omap4: Move l4 child devices to probe them with ti-sysc")
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: H. Nikolaus Schaller <hns@goldelico.com>
Cc: Keerthy <j-keerthy@ti.com>
Cc: Ladislav Michl <ladis@linux-mips.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Tero Kristo <t-kristo@ti.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Reported-by: H. Nikolaus Schaller <hns@goldelico.com>
Tested-By: Andreas Kemnade <andreas@kemnade.info>
Tested-By: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2019-01-29 07:41:15 -08:00

1004 lines
24 KiB
C

/*
* linux/arch/arm/plat-omap/dmtimer.c
*
* OMAP Dual-Mode Timers
*
* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
* Tarun Kanti DebBarma <tarun.kanti@ti.com>
* Thara Gopinath <thara@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) 2009 Texas Instruments
* Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@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/clk.h>
#include <linux/clk-provider.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_device.h>
#include <linux/platform_device.h>
#include <linux/platform_data/dmtimer-omap.h>
#include <clocksource/timer-ti-dm.h>
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);
writel_relaxed(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_of_set_source(struct omap_dm_timer *timer)
{
int ret;
struct clk *parent;
/*
* FIXME: OMAP1 devices do not use the clock framework for dmtimers so
* do not call clk_get() for these devices.
*/
if (!timer->fclk)
return -ENODEV;
parent = clk_get(&timer->pdev->dev, NULL);
if (IS_ERR(parent))
return -ENODEV;
/* Bail out if both clocks point to fck */
if (clk_is_match(parent, timer->fclk))
return 0;
ret = clk_set_parent(timer->fclk, parent);
if (ret < 0)
pr_err("%s: failed to set parent\n", __func__);
clk_put(parent);
return ret;
}
static int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
{
int ret;
const char *parent_name;
struct clk *parent;
struct dmtimer_platform_data *pdata;
if (unlikely(!timer) || 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;
default:
return -EINVAL;
}
pdata = timer->pdev->dev.platform_data;
/*
* 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 defined(CONFIG_COMMON_CLK)
/* Check if the clock has configurable parents */
if (clk_hw_get_num_parents(__clk_get_hw(timer->fclk)) < 2)
return 0;
#endif
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 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_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);
rc = omap_dm_timer_of_set_source(timer);
if (rc == -ENODEV)
return omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
return rc;
}
static inline u32 omap_dm_timer_reserved_systimer(int id)
{
return (omap_reserved_systimers & (1 << (id - 1))) ? 1 : 0;
}
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 capabilities than 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_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.
*/
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;
}
int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
{
if (timer)
return timer->irq;
return -EINVAL;
}
#if defined(CONFIG_ARCH_OMAP1)
#include <mach/hardware.h>
static struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
{
return NULL;
}
/**
* omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
* @inputmask: current value of idlect mask
*/
__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
{
int i = 0;
struct omap_dm_timer *timer = NULL;
unsigned long flags;
/* If ARMXOR cannot be idled this function call is unnecessary */
if (!(inputmask & (1 << 1)))
return inputmask;
/* If any active timer is using ARMXOR return modified mask */
spin_lock_irqsave(&dm_timer_lock, flags);
list_for_each_entry(timer, &omap_timer_list, node) {
u32 l;
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
if (l & OMAP_TIMER_CTRL_ST) {
if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0)
inputmask &= ~(1 << 1);
else
inputmask &= ~(1 << 2);
}
i++;
}
spin_unlock_irqrestore(&dm_timer_lock, flags);
return inputmask;
}
#else
static struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
{
if (timer && !IS_ERR(timer->fclk))
return timer->fclk;
return NULL;
}
__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
{
BUG();
return 0;
}
#endif
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_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 */
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) || prescaler < -1 || prescaler > 7)
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 >= 0) {
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 omap_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 = readl_relaxed(timer->irq_ena) & ~mask;
writel_relaxed(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 = readl_relaxed(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;
}
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 dmtimer_platform_data *pdata;
int ret;
pdata = of_device_get_match_data(dev);
if (!pdata)
pdata = dev_get_platdata(dev);
else
dev->platform_data = (void *)pdata;
if (!pdata) {
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(*timer), GFP_KERNEL);
if (!timer)
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;
pm_runtime_enable(dev);
if (!timer->reserved) {
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
dev_err(dev, "%s: pm_runtime_get_sync failed!\n",
__func__);
goto err_get_sync;
}
__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;
err_get_sync:
pm_runtime_put_noidle(dev);
pm_runtime_disable(dev);
return ret;
}
/**
* 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);
pm_runtime_disable(&pdev->dev);
return ret;
}
const static struct omap_dm_timer_ops dmtimer_ops = {
.request_by_node = omap_dm_timer_request_by_node,
.request_specific = omap_dm_timer_request_specific,
.request = omap_dm_timer_request,
.set_source = omap_dm_timer_set_source,
.get_irq = omap_dm_timer_get_irq,
.set_int_enable = omap_dm_timer_set_int_enable,
.set_int_disable = omap_dm_timer_set_int_disable,
.free = omap_dm_timer_free,
.enable = omap_dm_timer_enable,
.disable = omap_dm_timer_disable,
.get_fclk = omap_dm_timer_get_fclk,
.start = omap_dm_timer_start,
.stop = omap_dm_timer_stop,
.set_load = omap_dm_timer_set_load,
.set_match = omap_dm_timer_set_match,
.set_pwm = omap_dm_timer_set_pwm,
.set_prescaler = omap_dm_timer_set_prescaler,
.read_counter = omap_dm_timer_read_counter,
.write_counter = omap_dm_timer_write_counter,
.read_status = omap_dm_timer_read_status,
.write_status = omap_dm_timer_write_status,
};
static const struct dmtimer_platform_data omap3plus_pdata = {
.timer_errata = OMAP_TIMER_ERRATA_I103_I767,
.timer_ops = &dmtimer_ops,
};
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,
},
{
.compatible = "ti,dm816-timer",
.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");