[PATCH] powerpc: fix SMU driver interrupt mapping

The SMU driver tries to map an interrupt from the device-tree before the
interrupt controllers in the machine have been enumerated.  This doesn't work
properly and cause machines like the Quad g5 to fail booting later on when
some drivers waits endlessly for an SMU request to complete.  This is the
second problem preventing boot on the Quad g5.  This fixes it and also makes
the SMU driver a bit more resilient to not having an interrupt.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 38 insertions, 15 deletions

diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c
index f139a74696fe..00ef46898147 100644
--- a/drivers/macintosh/smu.c
+++ b/drivers/macintosh/smu.c
@@ -75,9 +75,11 @@ struct smu_device {
         struct of_device        *of_dev;
         int                     doorbell;       /* doorbell gpio */
         u32 __iomem             *db_buf;        /* doorbell buffer */
-        int                     db_irq;
+        struct device_node      *db_node;
+        unsigned int            db_irq;
         int                     msg;
-        int                     msg_irq;
+        struct device_node      *msg_node;
+        unsigned int            msg_irq;
         struct smu_cmd_buf      *cmd_buf;       /* command buffer virtual */
         u32                     cmd_buf_abs;    /* command buffer absolute */
         struct list_head        cmd_list;
@@ -93,6 +95,7 @@ struct smu_device {
  */
 static struct smu_device        *smu;
 static DEFINE_MUTEX(smu_part_access);
+static int smu_irq_inited;
 
 static void smu_i2c_retry(unsigned long data);
 
@@ -257,6 +260,10 @@ int smu_queue_cmd(struct smu_cmd *cmd)
                 smu_start_cmd();
         spin_unlock_irqrestore(&smu->lock, flags);
 
+        /* Workaround for early calls when irq isn't available */
+        if (!smu_irq_inited || smu->db_irq == NO_IRQ)
+                smu_spinwait_cmd(cmd);
+
         return 0;
 }
 EXPORT_SYMBOL(smu_queue_cmd);
@@ -478,14 +485,15 @@ int __init smu_init (void)
         smu->cmd_buf_abs = (u32)smu_cmdbuf_abs;
         smu->cmd_buf = (struct smu_cmd_buf *)abs_to_virt(smu_cmdbuf_abs);
 
-        np = of_find_node_by_name(NULL, "smu-doorbell");
-        if (np == NULL) {
+        smu->db_node = of_find_node_by_name(NULL, "smu-doorbell");
+        if (smu->db_node == NULL) {
                 printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n");
                 goto fail;
         }
-        data = (u32 *)get_property(np, "reg", NULL);
+        data = (u32 *)get_property(smu->db_node, "reg", NULL);
         if (data == NULL) {
-                of_node_put(np);
+                of_node_put(smu->db_node);
+                smu->db_node = NULL;
                 printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n");
                 goto fail;
         }
@@ -497,25 +505,21 @@ int __init smu_init (void)
         smu->doorbell = *data;
         if (smu->doorbell < 0x50)
                 smu->doorbell += 0x50;
-        smu->db_irq = irq_of_parse_and_map(np, 0);
-
-        of_node_put(np);
 
         /* Now look for the smu-interrupt GPIO */
         do {
-                np = of_find_node_by_name(NULL, "smu-interrupt");
-                if (np == NULL)
+                smu->msg_node = of_find_node_by_name(NULL, "smu-interrupt");
+                if (smu->msg_node == NULL)
                         break;
-                data = (u32 *)get_property(np, "reg", NULL);
+                data = (u32 *)get_property(smu->msg_node, "reg", NULL);
                 if (data == NULL) {
-                        of_node_put(np);
+                        of_node_put(smu->msg_node);
+                        smu->msg_node = NULL;
                         break;
                 }
                 smu->msg = *data;
                 if (smu->msg < 0x50)
                         smu->msg += 0x50;
-                smu->msg_irq = irq_of_parse_and_map(np, 0);
-                of_node_put(np);
         } while(0);
 
         /* Doorbell buffer is currently hard-coded, I didn't find a proper
@@ -547,6 +551,19 @@ static int smu_late_init(void)
         smu->i2c_timer.function = smu_i2c_retry;
         smu->i2c_timer.data = (unsigned long)smu;
 
+        if (smu->db_node) {
+                smu->db_irq = irq_of_parse_and_map(smu->db_node, 0);
+                if (smu->db_irq == NO_IRQ)
+                        printk(KERN_ERR "smu: failed to map irq for node %s\n",
+                               smu->db_node->full_name);
+        }
+        if (smu->msg_node) {
+                smu->msg_irq = irq_of_parse_and_map(smu->msg_node, 0);
+                if (smu->msg_irq == NO_IRQ)
+                        printk(KERN_ERR "smu: failed to map irq for node %s\n",
+                               smu->msg_node->full_name);
+        }
+
         /*
          * Try to request the interrupts
          */
@@ -571,6 +588,7 @@ static int smu_late_init(void)
                 }
         }
 
+        smu_irq_inited = 1;
         return 0;
 }
 /* This has to be before arch_initcall as the low i2c stuff relies on the
@@ -742,6 +760,11 @@ static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc)
         if (fail && --cmd->retries > 0) {
                 DPRINTK("SMU: i2c failure, starting timer...\n");
                 BUG_ON(cmd != smu->cmd_i2c_cur);
+                if (!smu_irq_inited) {
+                        mdelay(5);
+                        smu_i2c_retry(0);
+                        return;
+                }
                 mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5));
                 return;
         }