[PATCH 2/7] mfd: twl4030-irq: implement bus_lock/bus_sync_unlock methods

Felipe Balbi
2011-06-30T09:51:46Z

for doing that, drop the locking and change that
to a mutex.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
drivers/mfd/twl4030-irq.c | 37 +++++++++++++++++++++----------------
1 files changed, 21 insertions(+), 16 deletions(-)

diff --git a/drivers/mfd/twl4030-irq.c b/drivers/mfd/twl4030-irq.c
index 7be97cb..291364c 100644
--- a/drivers/mfd/twl4030-irq.c
+++ b/drivers/mfd/twl4030-irq.c
@@ -460,8 +460,6 @@ static inline void activate_irq(int irq)

/*----------------------------------------------------------------------*/

-static DEFINE_SPINLOCK(sih_agent_lock);
-
static struct workqueue_struct *wq;

struct sih_agent {
@@ -474,6 +472,8 @@ struct sih_agent {

u32 edge_change;
struct work_struct edge_work;
+
+ struct mutex irq_lock;
};

static void twl4030_sih_do_mask(struct work_struct *work)
@@ -489,7 +489,6 @@ static void twl4030_sih_do_mask(struct work_struct *work)
agent = container_of(work, struct sih_agent, mask_work);

/* see what work we have */
- spin_lock_irq(&sih_agent_lock);
if (agent->imr_change_pending) {
sih = agent->sih;
/* byte[0] gets overwritten as we write ... */
@@ -497,7 +496,6 @@ static void twl4030_sih_do_mask(struct work_struct *work)
agent->imr_change_pending = false;
} else
sih = NULL;
- spin_unlock_irq(&sih_agent_lock);
if (!sih)
return;

@@ -520,11 +518,9 @@ static void twl4030_sih_do_edge(struct work_struct *work)
agent = container_of(work, struct sih_agent, edge_work);

/* see what work we have */
- spin_lock_irq(&sih_agent_lock);
edge_change = agent->edge_change;
agent->edge_change = 0;
sih = edge_change ? agent->sih : NULL;
- spin_unlock_irq(&sih_agent_lock);
if (!sih)
return;

@@ -580,49 +576,57 @@ static void twl4030_sih_do_edge(struct work_struct *work)
static void twl4030_sih_mask(struct irq_data *data)
{
struct sih_agent *sih = irq_data_get_irq_chip_data(data);
- unsigned long flags;

- spin_lock_irqsave(&sih_agent_lock, flags);
sih->imr |= BIT(data->irq - sih->irq_base);
sih->imr_change_pending = true;
queue_work(wq, &sih->mask_work);
- spin_unlock_irqrestore(&sih_agent_lock, flags);
}

static void twl4030_sih_unmask(struct irq_data *data)
{
struct sih_agent *sih = irq_data_get_irq_chip_data(data);
- unsigned long flags;

- spin_lock_irqsave(&sih_agent_lock, flags);
sih->imr &= ~BIT(data->irq - sih->irq_base);
sih->imr_change_pending = true;
queue_work(wq, &sih->mask_work);
- spin_unlock_irqrestore(&sih_agent_lock, flags);
}

static int twl4030_sih_set_type(struct irq_data *data, unsigned trigger)
{
struct sih_agent *sih = irq_data_get_irq_chip_data(data);
- unsigned long flags;

if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
return -EINVAL;

- spin_lock_irqsave(&sih_agent_lock, flags);
if (irqd_get_trigger_type(data) != trigger) {
sih->edge_change |= BIT(data->irq - sih->irq_base);
queue_work(wq, &sih->edge_work);
}
- spin_unlock_irqrestore(&sih_agent_lock, flags);
+
return 0;
}

+static void twl4030_sih_bus_lock(struct irq_data *data)
+{
+ struct sih_agent *sih = irq_data_get_irq_chip_data(data);
+
+ mutex_lock(&sih->irq_lock);
+}
+
+static void twl4030_sih_bus_sync_unlock(struct irq_data *data)
+{
+ struct sih_agent *sih = irq_data_get_irq_chip_data(data);
+
+ mutex_unlock(&sih->irq_lock);
+}
+
static struct irq_chip twl4030_sih_irq_chip = {
.name = "twl4030",
.irq_mask = twl4030_sih_mask,
.irq_unmask = twl4030_sih_unmask,
.irq_set_type = twl4030_sih_set_type,
+ .irq_bus_lock = twl4030_sih_bus_lock,
+ .irq_bus_sync_unlock = twl4030_sih_bus_sync_unlock,
};

/*----------------------------------------------------------------------*/
@@ -718,15 +722,16 @@ int twl4030_sih_setup(int module)
agent->irq_base = irq_base;
agent->sih = sih;
agent->imr = ~0;
+ mutex_init(&agent->irq_lock);
INIT_WORK(&agent->mask_work, twl4030_sih_do_mask);
INIT_WORK(&agent->edge_work, twl4030_sih_do_edge);

for (i = 0; i < sih->bits; i++) {
irq = irq_base + i;

+ irq_set_chip_data(irq, agent);
irq_set_chip_and_handler(irq, &twl4030_sih_irq_chip,
handle_edge_irq);
- irq_set_chip_data(irq, agent);
activate_irq(irq);
}

--
1.7.6