[ARM] 4348/4: iop3xx: Give Linux control over PCI initialization

Currently the iop3xx platform support code assumes that RedBoot is the
bootloader and has already initialized the ATU.  Linux should handle this
initialization for three reasons:

1/ The memory map that RedBoot sets up is not optimal (page_to_dma and
virt_to_phys return different addresses).  The effect of this is that using
the dma mapping API for the internal bus dma units generates pci bus
addresses that are incorrect for the internal bus.

2/ Not all iop platforms use RedBoot

3/ If the ATU is already initialized it indicates that the iop is an add-in
card in another host, it does not own the PCI bus, and should not be
re-initialized.

Changelog:
* rather than change nr_controllers to zero, simply do not call
  pci_common_init

Cc: Lennert Buytenhek <kernel@wantstofly.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 12 insertions, 2 deletions

diff --git a/arch/arm/mach-iop33x/Kconfig b/arch/arm/mach-iop33x/Kconfig
index 9aa016bb18f9..45598e096898 100644
--- a/arch/arm/mach-iop33x/Kconfig
+++ b/arch/arm/mach-iop33x/Kconfig
@@ -16,6 +16,14 @@ config MACH_IQ80332
           Say Y here if you want to run your kernel on the Intel IQ80332
           evaluation kit for the IOP332 chipset.
 
+config IOP3XX_ATU
+        bool "Enable the PCI Controller"
+        default y
+        help
+          Say Y here if you want the IOP to initialize its PCI Controller.
+          Say N if the IOP is an add in card, the host system owns the PCI
+          bus in this case.
+
 endmenu
 
 endif
diff --git a/arch/arm/mach-iop33x/iq80331.c b/arch/arm/mach-iop33x/iq80331.c
index 1a9e36138d80..376c932830be 100644
--- a/arch/arm/mach-iop33x/iq80331.c
+++ b/arch/arm/mach-iop33x/iq80331.c
@@ -96,7 +96,8 @@ static struct hw_pci iq80331_pci __initdata = {
 
 static int __init iq80331_pci_init(void)
 {
-        if (machine_is_iq80331())
+        if ((iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) &&
+                machine_is_iq80331())
                 pci_common_init(&iq80331_pci);
 
         return 0;
diff --git a/arch/arm/mach-iop33x/iq80332.c b/arch/arm/mach-iop33x/iq80332.c
index 96d6f0f3cd21..58c81496c6f6 100644
--- a/arch/arm/mach-iop33x/iq80332.c
+++ b/arch/arm/mach-iop33x/iq80332.c
@@ -96,7 +96,8 @@ static struct hw_pci iq80332_pci __initdata = {
 
 static int __init iq80332_pci_init(void)
 {
-        if (machine_is_iq80332())
+        if ((iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) &&
+                machine_is_iq80332())
                 pci_common_init(&iq80332_pci);
 
         return 0;