iop: unconditionally initialize the ATU on platforms known to be 'hosts'

Platforms like iq80321 and iq80331 which may be host-bus-adapters
require 'iop3xx_init_atu=y' to be specified on the kernel command line.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

arch/arm/mach-iop32x/Kconfig

@@ -34,14 +34,6 @@ config MACH_N2100
 	  Say Y here if you want to run your kernel on the Thecus n2100
 	  NAS appliance.
 
-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.
-
 config MACH_EM7210
 	bool "Enable support for the Lanner EM7210"
 	help

arch/arm/mach-iop32x/iq31244.c

@@ -178,10 +178,9 @@ static struct hw_pci iq31244_pci __initdata = {
 
 static int __init iq31244_pci_init(void)
 {
-	if (is_ep80219()) {
-		if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE)
-			pci_common_init(&ep80219_pci);
-	} else if (machine_is_iq31244()) {
+	if (is_ep80219())
+		pci_common_init(&ep80219_pci);
+	else if (machine_is_iq31244()) {
 		if (is_80219()) {
 			printk("note: iq31244 board type has been selected\n");
 			printk("note: to select ep80219 operation:\n");
@@ -190,9 +189,7 @@ static int __init iq31244_pci_init(void)
 			printk("\t2/ update boot loader to pass"
 				" the ep80219 id: %d\n", MACH_TYPE_EP80219);
 		}
-
-		if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE)
-			pci_common_init(&iq31244_pci);
+		pci_common_init(&iq31244_pci);
 	}
 
 	return 0;

arch/arm/mach-iop32x/iq80321.c

@@ -106,7 +106,7 @@ static struct hw_pci iq80321_pci __initdata = {
 	.swizzle	= pci_std_swizzle,
 	.nr_controllers = 1,
 	.setup		= iop3xx_pci_setup,
-	.preinit	= iop3xx_pci_preinit,
+	.preinit	= iop3xx_pci_preinit_cond,
 	.scan		= iop3xx_pci_scan_bus,
 	.map_irq	= iq80321_pci_map_irq,
 };

arch/arm/mach-iop33x/Kconfig

@@ -16,14 +16,6 @@ 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

arch/arm/mach-iop33x/iq80331.c

@@ -89,7 +89,7 @@ static struct hw_pci iq80331_pci __initdata = {
 	.swizzle	= pci_std_swizzle,
 	.nr_controllers = 1,
 	.setup		= iop3xx_pci_setup,
-	.preinit	= iop3xx_pci_preinit,
+	.preinit	= iop3xx_pci_preinit_cond,
 	.scan		= iop3xx_pci_scan_bus,
 	.map_irq	= iq80331_pci_map_irq,
 };

arch/arm/mach-iop33x/iq80332.c

@@ -89,7 +89,7 @@ static struct hw_pci iq80332_pci __initdata = {
 	.swizzle	= pci_std_swizzle,
 	.nr_controllers = 1,
 	.setup		= iop3xx_pci_setup,
-	.preinit	= iop3xx_pci_preinit,
+	.preinit	= iop3xx_pci_preinit_cond,
 	.scan		= iop3xx_pci_scan_bus,
 	.map_irq	= iq80332_pci_map_irq,
 };

arch/arm/plat-iop/pci.c

@@ -24,6 +24,7 @@
 #include <asm/hardware.h>
 #include <asm/mach/pci.h>
 #include <asm/hardware/iop3xx.h>
+#include <asm/mach-types.h>
 
 // #define DEBUG
 
@@ -325,13 +326,16 @@ void __init iop3xx_atu_disable(void)
 /* Flag to determine whether the ATU is initialized and the PCI bus scanned */
 int init_atu;
 
-void __init iop3xx_pci_preinit(void)
-{
-	if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) {
-		iop3xx_atu_disable();
-		iop3xx_atu_setup();
-	}
+int iop3xx_get_init_atu(void) {
+	/* check if default has been overridden */
+	if (init_atu != IOP3XX_INIT_ATU_DEFAULT)
+		return init_atu;
+	else
+		return IOP3XX_INIT_ATU_DISABLE;
+}
 
+static void __init iop3xx_atu_debug(void)
+{
 	DBG("PCI: Intel IOP3xx PCI init.\n");
 	DBG("PCI: Outbound memory window 0: PCI 0x%08x%08x\n",
 		*IOP3XX_OUMWTVR0, *IOP3XX_OMWTVR0);
@@ -358,6 +362,23 @@ void __init iop3xx_pci_preinit(void)
 	hook_fault_code(16+6, iop3xx_pci_abort, SIGBUS, "imprecise external abort");
 }
 
+/* for platforms that might be host-bus-adapters */
+void __init iop3xx_pci_preinit_cond(void)
+{
+	if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) {
+		iop3xx_atu_disable();
+		iop3xx_atu_setup();
+		iop3xx_atu_debug();
+	}
+}
+
+void __init iop3xx_pci_preinit(void)
+{
+	iop3xx_atu_disable();
+	iop3xx_atu_setup();
+	iop3xx_atu_debug();
+}
+
 /* allow init_atu to be user overridden */
 static int __init iop3xx_init_atu_setup(char *str)
 {

include/asm-arm/hardware/iop3xx.h

@@ -29,6 +29,7 @@ extern void gpio_line_config(int line, int direction);
 extern int  gpio_line_get(int line);
 extern void gpio_line_set(int line, int value);
 extern int init_atu;
+extern int iop3xx_get_init_atu(void);
 #endif
 
 
@@ -112,14 +113,6 @@ extern int init_atu;
 #define IOP3XX_INIT_ATU_DISABLE -1
 #define IOP3XX_INIT_ATU_ENABLE	 1
 
-#ifdef CONFIG_IOP3XX_ATU
-#define iop3xx_get_init_atu(x) (init_atu == IOP3XX_INIT_ATU_DEFAULT ?\
-				IOP3XX_INIT_ATU_ENABLE : init_atu)
-#else
-#define iop3xx_get_init_atu(x) (init_atu == IOP3XX_INIT_ATU_DEFAULT ?\
-				IOP3XX_INIT_ATU_DISABLE : init_atu)
-#endif
-
 /* Messaging Unit  */
 #define IOP3XX_IMR0		(volatile u32 *)IOP3XX_REG_ADDR(0x0310)
 #define IOP3XX_IMR1		(volatile u32 *)IOP3XX_REG_ADDR(0x0314)

include/asm-arm/mach/pci.h

@@ -55,6 +55,7 @@ void pci_common_init(struct hw_pci *);
 extern int iop3xx_pci_setup(int nr, struct pci_sys_data *);
 extern struct pci_bus *iop3xx_pci_scan_bus(int nr, struct pci_sys_data *);
 extern void iop3xx_pci_preinit(void);
+extern void iop3xx_pci_preinit_cond(void);
 
 extern int dc21285_setup(int nr, struct pci_sys_data *);
 extern struct pci_bus *dc21285_scan_bus(int nr, struct pci_sys_data *);