[POWERPC] Add new interrupt mapping core and change platforms to use it

This adds the new irq remapper core and removes the old one.  Because
there are some fundamental conflicts with the old code, like the value
of NO_IRQ which I'm now setting to 0 (as per discussions with Linus),
etc..., this commit also changes the relevant platform and driver code
over to use the new remapper (so as not to cause difficulties later
in bisecting).

This patch removes the old pre-parsing of the open firmware interrupt
tree along with all the bogus assumptions it made to try to renumber
interrupts according to the platform. This is all to be handled by the
new code now.

For the pSeries XICS interrupt controller, a single remapper host is
created for the whole machine regardless of how many interrupt
presentation and source controllers are found, and it's set to match
any device node that isn't a 8259.  That works fine on pSeries and
avoids having to deal with some of the complexities of split source
controllers vs. presentation controllers in the pSeries device trees.

The powerpc i8259 PIC driver now always requests the legacy interrupt
range. It also has the feature of being able to match any device node
(including NULL) if passed no device node as an input. That will help
porting over platforms with broken device-trees like Pegasos who don't
have a proper interrupt tree.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 22 insertions, 24 deletions

diff --git a/arch/powerpc/kernel/legacy_serial.c b/arch/powerpc/kernel/legacy_serial.c
index a55056676ca4..7e98e778b52f 100644
--- a/arch/powerpc/kernel/legacy_serial.c
+++ b/arch/powerpc/kernel/legacy_serial.c
@@ -28,6 +28,7 @@ static struct legacy_serial_info {
         struct device_node              *np;
         unsigned int                    speed;
         unsigned int                    clock;
+        int                             irq_check_parent;
         phys_addr_t                     taddr;
 } legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS];
 static unsigned int legacy_serial_count;
@@ -36,7 +37,7 @@ static int legacy_serial_console = -1;
 static int __init add_legacy_port(struct device_node *np, int want_index,
                                   int iotype, phys_addr_t base,
                                   phys_addr_t taddr, unsigned long irq,
-                                  upf_t flags)
+                                  upf_t flags, int irq_check_parent)
 {
         u32 *clk, *spd, clock = BASE_BAUD * 16;
         int index;
@@ -68,7 +69,7 @@ static int __init add_legacy_port(struct device_node *np, int want_index,
         if (legacy_serial_infos[index].np != 0) {
                 /* if we still have some room, move it, else override */
                 if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) {
-                        printk(KERN_INFO "Moved legacy port %d -> %d\n",
+                        printk(KERN_DEBUG "Moved legacy port %d -> %d\n",
                                index, legacy_serial_count);
                         legacy_serial_ports[legacy_serial_count] =
                                 legacy_serial_ports[index];
@@ -76,7 +77,7 @@ static int __init add_legacy_port(struct device_node *np, int want_index,
                                 legacy_serial_infos[index];
                         legacy_serial_count++;
                 } else {
-                        printk(KERN_INFO "Replacing legacy port %d\n", index);
+                        printk(KERN_DEBUG "Replacing legacy port %d\n", index);
                 }
         }
 
@@ -95,10 +96,11 @@ static int __init add_legacy_port(struct device_node *np, int want_index,
         legacy_serial_infos[index].np = of_node_get(np);
         legacy_serial_infos[index].clock = clock;
         legacy_serial_infos[index].speed = spd ? *spd : 0;
+        legacy_serial_infos[index].irq_check_parent = irq_check_parent;
 
-        printk(KERN_INFO "Found legacy serial port %d for %s\n",
+        printk(KERN_DEBUG "Found legacy serial port %d for %s\n",
                index, np->full_name);
-        printk(KERN_INFO "  %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
+        printk(KERN_DEBUG "  %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
                (iotype == UPIO_PORT) ? "port" : "mem",
                (unsigned long long)base, (unsigned long long)taddr, irq,
                legacy_serial_ports[index].uartclk,
@@ -132,7 +134,7 @@ static int __init add_legacy_soc_port(struct device_node *np,
         /* Add port, irq will be dealt with later. We passed a translated
          * IO port value. It will be fixed up later along with the irq
          */
-        return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags);
+        return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags, 0);
 }
 
 static int __init add_legacy_isa_port(struct device_node *np,
@@ -170,7 +172,7 @@ static int __init add_legacy_isa_port(struct device_node *np,
 
         /* Add port, irq will be dealt with later */
         return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr,
-                               NO_IRQ, UPF_BOOT_AUTOCONF);
+                               NO_IRQ, UPF_BOOT_AUTOCONF, 0);
 
 }
 
@@ -242,7 +244,8 @@ static int __init add_legacy_pci_port(struct device_node *np,
         /* Add port, irq will be dealt with later. We passed a translated
          * IO port value. It will be fixed up later along with the irq
          */
-        return add_legacy_port(np, index, iotype, base, addr, NO_IRQ, UPF_BOOT_AUTOCONF);
+        return add_legacy_port(np, index, iotype, base, addr, NO_IRQ,
+                               UPF_BOOT_AUTOCONF, np != pci_dev);
 }
 #endif
 
@@ -373,27 +376,22 @@ static void __init fixup_port_irq(int index,
                                   struct device_node *np,
                                   struct plat_serial8250_port *port)
 {
+        unsigned int virq;
+
         DBG("fixup_port_irq(%d)\n", index);
 
-        /* Check for interrupts in that node */
-        if (np->n_intrs > 0) {
-                port->irq = np->intrs[0].line;
-                DBG(" port %d (%s), irq=%d\n",
-                    index, np->full_name, port->irq);
-                return;
+        virq = irq_of_parse_and_map(np, 0);
+        if (virq == NO_IRQ && legacy_serial_infos[index].irq_check_parent) {
+                np = of_get_parent(np);
+                if (np == NULL)
+                        return;
+                virq = irq_of_parse_and_map(np, 0);
+                of_node_put(np);
         }
-
-        /* Check for interrupts in the parent */
-        np = of_get_parent(np);
-        if (np == NULL)
+        if (virq == NO_IRQ)
                 return;
 
-        if (np->n_intrs > 0) {
-                port->irq = np->intrs[0].line;
-                DBG(" port %d (%s), irq=%d\n",
-                    index, np->full_name, port->irq);
-        }
-        of_node_put(np);
+        port->irq = virq;
 }
 
 static void __init fixup_port_pio(int index,