ARM: integrator: merge PCIv3 driver into one file

The Integrator/AP PCI bridget, "v3" is contained in two files,
where pci.c is a socket container to plug in the v3 device.
However to transition the v3 to enable device tree probing, it
need to be converted to a platform device (so that it can have
a device node in the device tree) and then we want the PCI
driver in a single file, as any other device driver, so we can
handle variants using compatible strings and device name,
and get the base address etc from resources connected to the
device node.

To move toward this goal we consolidate all code in the
pci_v3.c file.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 84 insertions, 4 deletions

diff --git a/arch/arm/mach-integrator/pci_v3.c b/arch/arm/mach-integrator/pci_v3.c
index e7fcea7..b8d7033 100644
--- a/arch/arm/mach-integrator/pci_v3.c
+++ b/arch/arm/mach-integrator/pci_v3.c
@@ -35,6 +35,7 @@
 #include <asm/signal.h>
 #include <asm/mach/pci.h>
 #include <asm/irq_regs.h>
+#include <asm/mach-types.h>
 
 #include <asm/hardware/pci_v3.h>
 
@@ -337,7 +338,7 @@ static int v3_write_config(struct pci_bus *bus, unsigned int devfn, int where,
 	return PCIBIOS_SUCCESSFUL;
 }
 
-struct pci_ops pci_v3_ops = {
+static struct pci_ops pci_v3_ops = {
 	.read	= v3_read_config,
 	.write	= v3_write_config,
 };
@@ -471,7 +472,7 @@ static irqreturn_t v3_irq(int dummy, void *devid)
 	return IRQ_HANDLED;
 }
 
-int __init pci_v3_setup(int nr, struct pci_sys_data *sys)
+static int __init pci_v3_setup(int nr, struct pci_sys_data *sys)
 {
 	int ret = 0;
 
@@ -490,7 +491,7 @@ int __init pci_v3_setup(int nr, struct pci_sys_data *sys)
  * V3_LB_BASE? - local bus address
  * V3_LB_MAP?  - pci bus address
  */
-void __init pci_v3_preinit(void)
+static void __init pci_v3_preinit(void)
 {
 	unsigned long flags;
 	unsigned int temp;
@@ -589,7 +590,7 @@ void __init pci_v3_preinit(void)
 	raw_spin_unlock_irqrestore(&v3_lock, flags);
 }
 
-void __init pci_v3_postinit(void)
+static void __init pci_v3_postinit(void)
 {
 	unsigned int pci_cmd;
 
@@ -610,3 +611,82 @@ void __init pci_v3_postinit(void)
 
 	register_isa_ports(PHYS_PCI_MEM_BASE, PHYS_PCI_IO_BASE, 0);
 }
+
+/*
+ * A small note about bridges and interrupts.  The DECchip 21050 (and
+ * later) adheres to the PCI-PCI bridge specification.  This says that
+ * the interrupts on the other side of a bridge are swizzled in the
+ * following manner:
+ *
+ * Dev    Interrupt   Interrupt
+ *        Pin on      Pin on
+ *        Device      Connector
+ *
+ *   4    A           A
+ *        B           B
+ *        C           C
+ *        D           D
+ *
+ *   5    A           B
+ *        B           C
+ *        C           D
+ *        D           A
+ *
+ *   6    A           C
+ *        B           D
+ *        C           A
+ *        D           B
+ *
+ *   7    A           D
+ *        B           A
+ *        C           B
+ *        D           C
+ *
+ * Where A = pin 1, B = pin 2 and so on and pin=0 = default = A.
+ * Thus, each swizzle is ((pin-1) + (device#-4)) % 4
+ */
+
+/*
+ * This routine handles multiple bridges.
+ */
+static u8 __init integrator_swizzle(struct pci_dev *dev, u8 *pinp)
+{
+	if (*pinp == 0)
+		*pinp = 1;
+
+	return pci_common_swizzle(dev, pinp);
+}
+
+static int irq_tab[4] __initdata = {
+	IRQ_AP_PCIINT0,	IRQ_AP_PCIINT1,	IRQ_AP_PCIINT2,	IRQ_AP_PCIINT3
+};
+
+/*
+ * map the specified device/slot/pin to an IRQ.  This works out such
+ * that slot 9 pin 1 is INT0, pin 2 is INT1, and slot 10 pin 1 is INT1.
+ */
+static int __init integrator_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	int intnr = ((slot - 9) + (pin - 1)) & 3;
+
+	return irq_tab[intnr];
+}
+
+static struct hw_pci integrator_pci __initdata = {
+	.swizzle		= integrator_swizzle,
+	.map_irq		= integrator_map_irq,
+	.setup			= pci_v3_setup,
+	.nr_controllers		= 1,
+	.ops			= &pci_v3_ops,
+	.preinit		= pci_v3_preinit,
+	.postinit		= pci_v3_postinit,
+};
+
+static int __init integrator_pci_init(void)
+{
+	if (machine_is_integrator())
+		pci_common_init(&integrator_pci);
+	return 0;
+}
+
+subsys_initcall(integrator_pci_init);