vme: change LM callback argument to void pointer

Make the location monitor callback function prototype more useful by
changing the argument from an integer to a void pointer.

All VME bridge drivers were simply passing the location monitor index
(e.g. 0-3) as the argument to these callbacks. It is much more useful
to pass back a pointer to data that the callback-registering driver
cares about.

There appear to be no in-kernel callers of vme_lm_attach (or
vme_lme_request for that matter), so this change only affects the VME
subsystem and bridge drivers.

This has been tested with Tsi148 hardware, but the CA91Cx42 changes
have only been compiled.

Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Acked-by: Martyn Welch <martyn@welchs.me.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

6 files changed, 16 insertions, 9 deletions

diff --git a/drivers/vme/bridges/vme_ca91cx42.c b/drivers/vme/bridges/vme_ca91cx42.c
index 9f2c834..da29dbe 100644
--- a/drivers/vme/bridges/vme_ca91cx42.c
+++ b/drivers/vme/bridges/vme_ca91cx42.c
@@ -69,7 +69,7 @@ static u32 ca91cx42_LM_irqhandler(struct ca91cx42_driver *bridge, u32 stat)
 	for (i = 0; i < 4; i++) {
 		if (stat & CA91CX42_LINT_LM[i]) {
 			/* We only enable interrupts if the callback is set */
-			bridge->lm_callback[i](i);
+			bridge->lm_callback[i](bridge->lm_data[i]);
 			serviced |= CA91CX42_LINT_LM[i];
 		}
 	}
@@ -1410,7 +1410,7 @@ static int ca91cx42_lm_get(struct vme_lm_resource *lm,
  * Callback will be passed the monitor triggered.
  */
 static int ca91cx42_lm_attach(struct vme_lm_resource *lm, int monitor,
-	void (*callback)(int))
+	void (*callback)(void *), void *data)
 {
 	u32 lm_ctl, tmp;
 	struct ca91cx42_driver *bridge;
@@ -1438,6 +1438,7 @@ static int ca91cx42_lm_attach(struct vme_lm_resource *lm, int monitor,
 
 	/* Attach callback */
 	bridge->lm_callback[monitor] = callback;
+	bridge->lm_data[monitor] = data;
 
 	/* Enable Location Monitor interrupt */
 	tmp = ioread32(bridge->base + LINT_EN);
@@ -1477,6 +1478,7 @@ static int ca91cx42_lm_detach(struct vme_lm_resource *lm, int monitor)
 
 	/* Detach callback */
 	bridge->lm_callback[monitor] = NULL;
+	bridge->lm_data[monitor] = NULL;
 
 	/* If all location monitors disabled, disable global Location Monitor */
 	if ((tmp & (CA91CX42_LINT_LM0 | CA91CX42_LINT_LM1 | CA91CX42_LINT_LM2 |
diff --git a/drivers/vme/bridges/vme_ca91cx42.h b/drivers/vme/bridges/vme_ca91cx42.h
index d54119e..f35c9f5 100644
--- a/drivers/vme/bridges/vme_ca91cx42.h
+++ b/drivers/vme/bridges/vme_ca91cx42.h
@@ -43,7 +43,8 @@ struct ca91cx42_driver {
 	wait_queue_head_t dma_queue;
 	wait_queue_head_t iack_queue;
 	wait_queue_head_t mbox_queue;
-	void (*lm_callback[4])(int);	/* Called in interrupt handler */
+	void (*lm_callback[4])(void *);	/* Called in interrupt handler */
+	void *lm_data[4];
 	void *crcsr_kernel;
 	dma_addr_t crcsr_bus;
 	struct mutex vme_rmw;		/* Only one RMW cycle at a time */
diff --git a/drivers/vme/bridges/vme_tsi148.c b/drivers/vme/bridges/vme_tsi148.c
index 4bc5d45..2d3ba1a 100644
--- a/drivers/vme/bridges/vme_tsi148.c
+++ b/drivers/vme/bridges/vme_tsi148.c
@@ -102,7 +102,7 @@ static u32 tsi148_LM_irqhandler(struct tsi148_driver *bridge, u32 stat)
 	for (i = 0; i < 4; i++) {
 		if (stat & TSI148_LCSR_INTS_LMS[i]) {
 			/* We only enable interrupts if the callback is set */
-			bridge->lm_callback[i](i);
+			bridge->lm_callback[i](bridge->lm_data[i]);
 			serviced |= TSI148_LCSR_INTC_LMC[i];
 		}
 	}
@@ -2047,7 +2047,7 @@ static int tsi148_lm_get(struct vme_lm_resource *lm,
  * Callback will be passed the monitor triggered.
  */
 static int tsi148_lm_attach(struct vme_lm_resource *lm, int monitor,
-	void (*callback)(int))
+	void (*callback)(void *), void *data)
 {
 	u32 lm_ctl, tmp;
 	struct vme_bridge *tsi148_bridge;
@@ -2077,6 +2077,7 @@ static int tsi148_lm_attach(struct vme_lm_resource *lm, int monitor,
 
 	/* Attach callback */
 	bridge->lm_callback[monitor] = callback;
+	bridge->lm_data[monitor] = data;
 
 	/* Enable Location Monitor interrupt */
 	tmp = ioread32be(bridge->base + TSI148_LCSR_INTEN);
@@ -2124,6 +2125,7 @@ static int tsi148_lm_detach(struct vme_lm_resource *lm, int monitor)
 
 	/* Detach callback */
 	bridge->lm_callback[monitor] = NULL;
+	bridge->lm_data[monitor] = NULL;
 
 	/* If all location monitors disabled, disable global Location Monitor */
 	if ((lm_en & (TSI148_LCSR_INTS_LM0S | TSI148_LCSR_INTS_LM1S |
diff --git a/drivers/vme/bridges/vme_tsi148.h b/drivers/vme/bridges/vme_tsi148.h
index f5ed1438..0935d85 100644
--- a/drivers/vme/bridges/vme_tsi148.h
+++ b/drivers/vme/bridges/vme_tsi148.h
@@ -38,7 +38,8 @@ struct tsi148_driver {
 	void __iomem *base;	/* Base Address of device registers */
 	wait_queue_head_t dma_queue[2];
 	wait_queue_head_t iack_queue;
-	void (*lm_callback[4])(int);	/* Called in interrupt handler */
+	void (*lm_callback[4])(void *);	/* Called in interrupt handler */
+	void *lm_data[4];
 	void *crcsr_kernel;
 	dma_addr_t crcsr_bus;
 	struct vme_master_resource *flush_image;
diff --git a/drivers/vme/vme.c b/drivers/vme/vme.c
index 37ac0a5..4693b7b 100644
--- a/drivers/vme/vme.c
+++ b/drivers/vme/vme.c
@@ -1321,7 +1321,7 @@ int vme_lm_get(struct vme_resource *resource, unsigned long long *lm_base,
 EXPORT_SYMBOL(vme_lm_get);
 
 int vme_lm_attach(struct vme_resource *resource, int monitor,
-	void (*callback)(int))
+	void (*callback)(void *), void *data)
 {
 	struct vme_bridge *bridge = find_bridge(resource);
 	struct vme_lm_resource *lm;
@@ -1338,7 +1338,7 @@ int vme_lm_attach(struct vme_resource *resource, int monitor,
 		return -EINVAL;
 	}
 
-	return bridge->lm_attach(lm, monitor, callback);
+	return bridge->lm_attach(lm, monitor, callback, data);
 }
 EXPORT_SYMBOL(vme_lm_attach);
 
diff --git a/drivers/vme/vme_bridge.h b/drivers/vme/vme_bridge.h
index cb8246f..2662e91 100644
--- a/drivers/vme/vme_bridge.h
+++ b/drivers/vme/vme_bridge.h
@@ -160,7 +160,8 @@ struct vme_bridge {
 	int (*lm_set) (struct vme_lm_resource *, unsigned long long, u32, u32);
 	int (*lm_get) (struct vme_lm_resource *, unsigned long long *, u32 *,
 		u32 *);
-	int (*lm_attach) (struct vme_lm_resource *, int, void (*callback)(int));
+	int (*lm_attach)(struct vme_lm_resource *, int,
+			 void (*callback)(void *), void *);
 	int (*lm_detach) (struct vme_lm_resource *, int);
 
 	/* CR/CSR space functions */