[PATCH 02/29] pcmcia: setup IRQ to be used by PCMCIA drivers at card insert
Dominik Brodowski
linux at dominikbrodowski.net
Wed May 19 02:42:38 EDT 2010
Setup the IRQ to be used by PCMCIA drivers already during the device
registration stage, making use of a new function pcmcia_setup_irq().
This will allow us to get rid of quite a lot of indirection in the
future.
Signed-off-by: Dominik Brodowski <linux at dominikbrodowski.net>
---
drivers/pcmcia/cs_internal.h | 2 +
drivers/pcmcia/ds.c | 15 ++-
drivers/pcmcia/pcmcia_resource.c | 214 ++++++++++++++++++++++----------------
include/pcmcia/ds.h | 3 +
4 files changed, 140 insertions(+), 94 deletions(-)
diff --git a/drivers/pcmcia/cs_internal.h b/drivers/pcmcia/cs_internal.h
index f95864c..74d91c8 100644
--- a/drivers/pcmcia/cs_internal.h
+++ b/drivers/pcmcia/cs_internal.h
@@ -149,6 +149,8 @@ extern struct resource *pcmcia_find_mem_region(u_long base,
int low,
struct pcmcia_socket *s);
+void pcmcia_cleanup_irq(struct pcmcia_socket *s);
+int pcmcia_setup_irq(struct pcmcia_device *p_dev);
/* cistpl.c */
extern struct bin_attribute pccard_cis_attr;
diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index 041eee4..5fd2948 100644
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -546,26 +546,32 @@ struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int fu
p_dev->function_config = tmp_dev->function_config;
p_dev->io = tmp_dev->io;
p_dev->irq = tmp_dev->irq;
+ p_dev->irq_v = tmp_dev->irq_v;
kref_get(&p_dev->function_config->ref);
}
/* Add to the list in pcmcia_bus_socket */
list_add(&p_dev->socket_device_list, &s->devices_list);
- mutex_unlock(&s->ops_mutex);
+ if (pcmcia_setup_irq(p_dev))
+ dev_warn(&p_dev->dev,
+ "IRQ setup failed -- device might not work\n");
if (!p_dev->function_config) {
dev_dbg(&p_dev->dev, "creating config_t\n");
p_dev->function_config = kzalloc(sizeof(struct config_t),
GFP_KERNEL);
- if (!p_dev->function_config)
+ if (!p_dev->function_config) {
+ mutex_unlock(&s->ops_mutex);
goto err_unreg;
+ }
kref_init(&p_dev->function_config->ref);
}
+ mutex_unlock(&s->ops_mutex);
dev_printk(KERN_NOTICE, &p_dev->dev,
- "pcmcia: registering new device %s\n",
- p_dev->devname);
+ "pcmcia: registering new device %s (IRQ: %d)\n",
+ p_dev->devname, p_dev->irq_v);
pcmcia_device_query(p_dev);
@@ -1258,6 +1264,7 @@ static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
handle_event(skt, event);
mutex_lock(&s->ops_mutex);
destroy_cis_cache(s);
+ pcmcia_cleanup_irq(s);
mutex_unlock(&s->ops_mutex);
break;
diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index ba82cb3..ff9c0bc 100644
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -23,6 +23,8 @@
#include <linux/netdevice.h>
#include <linux/slab.h>
+#include <asm/irq.h>
+
#include <pcmcia/cs_types.h>
#include <pcmcia/ss.h>
#include <pcmcia/cs.h>
@@ -38,12 +40,6 @@ static int io_speed;
module_param(io_speed, int, 0444);
-#ifdef CONFIG_PCMCIA_PROBE
-#include <asm/irq.h>
-/* mask of IRQs already reserved by other cards, we should avoid using them */
-static u8 pcmcia_used_irq[NR_IRQS];
-#endif
-
static int pcmcia_adjust_io_region(struct resource *res, unsigned long start,
unsigned long end, struct pcmcia_socket *s)
{
@@ -440,15 +436,11 @@ static int pcmcia_release_irq(struct pcmcia_device *p_dev, irq_req_t *req)
}
if (--s->irq.Config == 0) {
c->state &= ~CONFIG_IRQ_REQ;
- s->irq.AssignedIRQ = 0;
}
if (req->Handler)
free_irq(req->AssignedIRQ, p_dev->priv);
-#ifdef CONFIG_PCMCIA_PROBE
- pcmcia_used_irq[req->AssignedIRQ]--;
-#endif
ret = 0;
out:
@@ -699,26 +691,14 @@ EXPORT_SYMBOL(pcmcia_request_io);
/** pcmcia_request_irq
*
* Request_irq() reserves an irq for this client.
- *
- * Also, since Linux only reserves irq's when they are actually
- * hooked, we don't guarantee that an irq will still be available
- * when the configuration is locked. Now that I think about it,
- * there might be a way to fix this using a dummy handler.
*/
-#ifdef CONFIG_PCMCIA_PROBE
-static irqreturn_t test_action(int cpl, void *dev_id)
-{
- return IRQ_NONE;
-}
-#endif
-
int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
{
struct pcmcia_socket *s = p_dev->socket;
config_t *c;
- int ret = -EINVAL, irq = 0;
- int type;
+ int ret = -EINVAL, irq = p_dev->irq_v;
+ int type = IRQF_SHARED;
mutex_lock(&s->ops_mutex);
@@ -736,63 +716,20 @@ int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
goto out;
}
- /* Decide what type of interrupt we are registering */
- type = 0;
- if (s->functions > 1) /* All of this ought to be handled higher up */
- type = IRQF_SHARED;
- else if (req->Attributes & IRQ_TYPE_DYNAMIC_SHARING)
- type = IRQF_SHARED;
- else
- printk(KERN_WARNING "pcmcia: Driver needs updating to support IRQ sharing.\n");
-
- /* If the interrupt is already assigned, it must be the same */
- if (s->irq.AssignedIRQ != 0)
- irq = s->irq.AssignedIRQ;
-
-#ifdef CONFIG_PCMCIA_PROBE
if (!irq) {
- int try;
- u32 mask = s->irq_mask;
- void *data = p_dev; /* something unique to this device */
-
- for (try = 0; try < 64; try++) {
- irq = try % 32;
-
- /* marked as available by driver, and not blocked by userspace? */
- if (!((mask >> irq) & 1))
- continue;
-
- /* avoid an IRQ which is already used by a PCMCIA card */
- if ((try < 32) && pcmcia_used_irq[irq])
- continue;
-
- /* register the correct driver, if possible, of check whether
- * registering a dummy handle works, i.e. if the IRQ isn't
- * marked as used by the kernel resource management core */
- ret = request_irq(irq,
- (req->Handler) ? req->Handler : test_action,
- type,
- p_dev->devname,
- (req->Handler) ? p_dev->priv : data);
- if (!ret) {
- if (!req->Handler)
- free_irq(irq, data);
- break;
- }
- }
+ dev_dbg(&s->dev, "no IRQ available\n");
+ goto out;
}
-#endif
- /* only assign PCI irq if no IRQ already assigned */
- if (ret && !s->irq.AssignedIRQ) {
- if (!s->pci_irq) {
- dev_printk(KERN_INFO, &s->dev, "no IRQ found\n");
- goto out;
- }
- type = IRQF_SHARED;
- irq = s->pci_irq;
+
+ if (!(req->Attributes & IRQ_TYPE_DYNAMIC_SHARING)) {
+ req->Attributes |= IRQ_TYPE_DYNAMIC_SHARING;
+ dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: "
+ "request for exclusive IRQ could not be fulfilled.\n");
+ dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver "
+ "needs updating to supported shared IRQ lines.\n");
}
- if (ret && req->Handler) {
+ if (req->Handler) {
ret = request_irq(irq, req->Handler, type,
p_dev->devname, p_dev->priv);
if (ret) {
@@ -802,25 +739,13 @@ int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
}
}
- /* Make sure the fact the request type was overridden is passed back */
- if (type == IRQF_SHARED && !(req->Attributes & IRQ_TYPE_DYNAMIC_SHARING)) {
- req->Attributes |= IRQ_TYPE_DYNAMIC_SHARING;
- dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: "
- "request for exclusive IRQ could not be fulfilled.\n");
- dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver "
- "needs updating to supported shared IRQ lines.\n");
- }
c->irq.Attributes = req->Attributes;
- s->irq.AssignedIRQ = req->AssignedIRQ = irq;
+ req->AssignedIRQ = irq;
s->irq.Config++;
c->state |= CONFIG_IRQ_REQ;
p_dev->_irq = 1;
-#ifdef CONFIG_PCMCIA_PROBE
- pcmcia_used_irq[irq]++;
-#endif
-
ret = 0;
out:
mutex_unlock(&s->ops_mutex);
@@ -829,6 +754,115 @@ out:
EXPORT_SYMBOL(pcmcia_request_irq);
+#ifdef CONFIG_PCMCIA_PROBE
+
+/* mask of IRQs already reserved by other cards, we should avoid using them */
+static u8 pcmcia_used_irq[NR_IRQS];
+
+static irqreturn_t test_action(int cpl, void *dev_id)
+{
+ return IRQ_NONE;
+}
+
+/**
+ * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used
+ * @p_dev - the associated PCMCIA device
+ *
+ * locking note: must be called with ops_mutex locked.
+ */
+static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
+{
+ struct pcmcia_socket *s = p_dev->socket;
+ unsigned int try, irq;
+ u32 mask = s->irq_mask;
+ int ret = -ENODEV;
+
+ for (try = 0; try < 64; try++) {
+ irq = try % 32;
+
+ /* marked as available by driver, not blocked by userspace? */
+ if (!((mask >> irq) & 1))
+ continue;
+
+ /* avoid an IRQ which is already used by another PCMCIA card */
+ if ((try < 32) && pcmcia_used_irq[irq])
+ continue;
+
+ /* register the correct driver, if possible, to check whether
+ * registering a dummy handle works, i.e. if the IRQ isn't
+ * marked as used by the kernel resource management core */
+ ret = request_irq(irq, test_action, type, p_dev->devname,
+ p_dev);
+ if (!ret) {
+ free_irq(irq, p_dev);
+ p_dev->irq_v = s->irq.AssignedIRQ = irq;
+ pcmcia_used_irq[irq]++;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+void pcmcia_cleanup_irq(struct pcmcia_socket *s)
+{
+ pcmcia_used_irq[s->irq.AssignedIRQ]--;
+ s->irq.AssignedIRQ = 0;
+}
+
+#else /* CONFIG_PCMCIA_PROBE */
+
+static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
+{
+ return -EINVAL;
+}
+
+void pcmcia_cleanup_irq(struct pcmcia_socket *s)
+{
+ s->irq.AssignedIRQ = 0;
+ return;
+}
+
+#endif /* CONFIG_PCMCIA_PROBE */
+
+
+/**
+ * pcmcia_setup_irq() - determine IRQ to be used for device
+ * @p_dev - the associated PCMCIA device
+ *
+ * locking note: must be called with ops_mutex locked.
+ */
+int pcmcia_setup_irq(struct pcmcia_device *p_dev)
+{
+ struct pcmcia_socket *s = p_dev->socket;
+
+ if (p_dev->irq_v)
+ return 0;
+
+ /* already assigned? */
+ if (s->irq.AssignedIRQ) {
+ p_dev->irq_v = s->irq.AssignedIRQ;
+ return 0;
+ }
+
+ /* prefer an exclusive ISA irq */
+ if (!pcmcia_setup_isa_irq(p_dev, 0))
+ return 0;
+
+ /* but accept a shared ISA irq */
+ if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED))
+ return 0;
+
+ /* but use the PCI irq otherwise */
+ if (s->pci_irq) {
+ p_dev->irq_v = s->irq.AssignedIRQ = s->pci_irq;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+
/** pcmcia_request_window
*
* Request_window() establishes a mapping between card memory space
diff --git a/include/pcmcia/ds.h b/include/pcmcia/ds.h
index aab3c13..52ebe75 100644
--- a/include/pcmcia/ds.h
+++ b/include/pcmcia/ds.h
@@ -95,6 +95,9 @@ struct pcmcia_device {
config_req_t conf;
window_handle_t win;
+ /* device setup */
+ unsigned int irq_v; /* do not use directly yet */
+
/* Is the device suspended? */
u16 suspended:1;
--
1.6.3.3
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