[POWERPC] Add an optional device_node pointer to the irq_host

The majority of irq_host implementations (3 out of 4) are associated
with a device_node, and need to stash it somewhere. Rather than having
it somewhere different for each host, add an optional device_node pointer
to the irq_host structure.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 13 insertions, 21 deletions

diff --git a/arch/powerpc/platforms/cell/axon_msi.c b/arch/powerpc/platforms/cell/axon_msi.c
index 4c9ab5b70bae..bdd97bb2446d 100644
--- a/arch/powerpc/platforms/cell/axon_msi.c
+++ b/arch/powerpc/platforms/cell/axon_msi.c
@@ -64,7 +64,6 @@
 
 
 struct axon_msic {
-        struct device_node *dn;
         struct irq_host *irq_host;
         __le32 *fifo;
         dcr_host_t dcr_host;
@@ -297,9 +296,7 @@ static int msic_host_map(struct irq_host *h, unsigned int virq,
 
 static int msic_host_match(struct irq_host *host, struct device_node *dn)
 {
-        struct axon_msic *msic = host->host_data;
-
-        return msic->dn == dn;
+        return host->of_node == dn;
 }
 
 static struct irq_host_ops msic_host_ops = {
@@ -314,7 +311,8 @@ static int axon_msi_notify_reboot(struct notifier_block *nb,
         u32 tmp;
 
         list_for_each_entry(msic, &axon_msic_list, list) {
-                pr_debug("axon_msi: disabling %s\n", msic->dn->full_name);
+                pr_debug("axon_msi: disabling %s\n",
+                          msic->irq_host->of_node->full_name);
                 tmp  = msic_dcr_read(msic, MSIC_CTRL_REG);
                 tmp &= ~MSIC_CTRL_ENABLE & ~MSIC_CTRL_IRQ_ENABLE;
                 msic_dcr_write(msic, MSIC_CTRL_REG, tmp);
@@ -370,8 +368,8 @@ static int axon_msi_setup_one(struct device_node *dn)
 
         msic->fifo = page_address(page);
 
-        msic->irq_host = irq_alloc_host(IRQ_HOST_MAP_NOMAP, NR_IRQS,
-                                        &msic_host_ops, 0);
+        msic->irq_host = irq_alloc_host(of_node_get(dn), IRQ_HOST_MAP_NOMAP,
+                                        NR_IRQS, &msic_host_ops, 0);
         if (!msic->irq_host) {
                 printk(KERN_ERR "axon_msi: couldn't allocate irq_host for %s\n",
                        dn->full_name);
@@ -387,8 +385,6 @@ static int axon_msi_setup_one(struct device_node *dn)
                 goto out_free_host;
         }
 
-        msic->dn = of_node_get(dn);
-
         set_irq_data(virq, msic);
         set_irq_chained_handler(virq, axon_msi_cascade);
         pr_debug("axon_msi: irq 0x%x setup for axon_msi\n", virq);
diff --git a/arch/powerpc/platforms/cell/interrupt.c b/arch/powerpc/platforms/cell/interrupt.c
index 47264e722029..c29e634177fa 100644
--- a/arch/powerpc/platforms/cell/interrupt.c
+++ b/arch/powerpc/platforms/cell/interrupt.c
@@ -381,7 +381,7 @@ static int __init setup_iic(void)
 void __init iic_init_IRQ(void)
 {
         /* Setup an irq host data structure */
-        iic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, IIC_SOURCE_COUNT,
+        iic_host = irq_alloc_host(NULL, IRQ_HOST_MAP_LINEAR, IIC_SOURCE_COUNT,
                                   &iic_host_ops, IIC_IRQ_INVALID);
         BUG_ON(iic_host == NULL);
         irq_set_default_host(iic_host);
diff --git a/arch/powerpc/platforms/cell/spider-pic.c b/arch/powerpc/platforms/cell/spider-pic.c
index 05f4b3d3d756..4309c2cbbeb9 100644
--- a/arch/powerpc/platforms/cell/spider-pic.c
+++ b/arch/powerpc/platforms/cell/spider-pic.c
@@ -63,7 +63,6 @@ enum {
 
 struct spider_pic {
         struct irq_host         *host;
-        struct device_node      *of_node;
         void __iomem            *regs;
         unsigned int            node_id;
 };
@@ -178,8 +177,7 @@ static struct irq_chip spider_pic = {
 
 static int spider_host_match(struct irq_host *h, struct device_node *node)
 {
-        struct spider_pic *pic = h->host_data;
-        return node == pic->of_node;
+        return h->of_node == node;
 }
 
 static int spider_host_map(struct irq_host *h, unsigned int virq,
@@ -247,18 +245,18 @@ static unsigned int __init spider_find_cascade_and_node(struct spider_pic *pic)
          * tree in case the device-tree is ever fixed
          */
         struct of_irq oirq;
-        if (of_irq_map_one(pic->of_node, 0, &oirq) == 0) {
+        if (of_irq_map_one(pic->host->of_node, 0, &oirq) == 0) {
                 virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
                                              oirq.size);
                 return virq;
         }
 
         /* Now do the horrible hacks */
-        tmp = of_get_property(pic->of_node, "#interrupt-cells", NULL);
+        tmp = of_get_property(pic->host->of_node, "#interrupt-cells", NULL);
         if (tmp == NULL)
                 return NO_IRQ;
         intsize = *tmp;
-        imap = of_get_property(pic->of_node, "interrupt-map", &imaplen);
+        imap = of_get_property(pic->host->of_node, "interrupt-map", &imaplen);
         if (imap == NULL || imaplen < (intsize + 1))
                 return NO_IRQ;
         iic = of_find_node_by_phandle(imap[intsize]);
@@ -308,15 +306,13 @@ static void __init spider_init_one(struct device_node *of_node, int chip,
                 panic("spider_pic: can't map registers !");
 
         /* Allocate a host */
-        pic->host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, SPIDER_SRC_COUNT,
-                                   &spider_host_ops, SPIDER_IRQ_INVALID);
+        pic->host = irq_alloc_host(of_node_get(of_node), IRQ_HOST_MAP_LINEAR,
+                                   SPIDER_SRC_COUNT, &spider_host_ops,
+                                   SPIDER_IRQ_INVALID);
         if (pic->host == NULL)
                 panic("spider_pic: can't allocate irq host !");
         pic->host->host_data = pic;
 
-        /* Fill out other bits */
-        pic->of_node = of_node_get(of_node);
-
         /* Go through all sources and disable them */
         for (i = 0; i < SPIDER_SRC_COUNT; i++) {
                 void __iomem *cfg = pic->regs + TIR_CFGA + 8 * i;