7 files changed, 168 insertions, 8 deletions

diff --git a/arch/arm/mach-iop32x/Kconfig b/arch/arm/mach-iop32x/Kconfig
index 9dd49cff21ff..9bb02b6d7ae1 100644
--- a/arch/arm/mach-iop32x/Kconfig
+++ b/arch/arm/mach-iop32x/Kconfig
@@ -34,6 +34,14 @@ 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.
+
 endmenu
 
 endif
diff --git a/arch/arm/mach-iop32x/iq31244.c b/arch/arm/mach-iop32x/iq31244.c
index 60e74309a458..7b21c6e13e59 100644
--- a/arch/arm/mach-iop32x/iq31244.c
+++ b/arch/arm/mach-iop32x/iq31244.c
@@ -178,9 +178,10 @@ static struct hw_pci iq31244_pci __initdata = {
 
 static int __init iq31244_pci_init(void)
 {
-        if (is_ep80219())
-                pci_common_init(&ep80219_pci);
-        else if (machine_is_iq31244()) {
+        if (is_ep80219()) {
+                if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE)
+                        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");
@@ -189,7 +190,9 @@ static int __init iq31244_pci_init(void)
                         printk("\t2/ update boot loader to pass"
                                 " the ep80219 id: %d\n", MACH_TYPE_EP80219);
                 }
-                pci_common_init(&iq31244_pci);
+
+                if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE)
+                        pci_common_init(&iq31244_pci);
         }
 
         return 0;
diff --git a/arch/arm/mach-iop32x/iq80321.c b/arch/arm/mach-iop32x/iq80321.c
index 361c70c0f64c..bc25fb91e7b9 100644
--- a/arch/arm/mach-iop32x/iq80321.c
+++ b/arch/arm/mach-iop32x/iq80321.c
@@ -113,7 +113,8 @@ static struct hw_pci iq80321_pci __initdata = {
 
 static int __init iq80321_pci_init(void)
 {
-        if (machine_is_iq80321())
+        if ((iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) &&
+                machine_is_iq80321())
                 pci_common_init(&iq80321_pci);
 
         return 0;
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;
diff --git a/arch/arm/plat-iop/pci.c b/arch/arm/plat-iop/pci.c
index b5f6ec35aafb..e2744b7227c5 100644
--- a/arch/arm/plat-iop/pci.c
+++ b/arch/arm/plat-iop/pci.c
@@ -55,7 +55,7 @@ static u32 iop3xx_cfg_address(struct pci_bus *bus, int devfn, int where)
  * This routine checks the status of the last configuration cycle.  If an error
  * was detected it returns a 1, else it returns a 0.  The errors being checked
  * are parity, master abort, target abort (master and target).  These types of
- * errors occure during a config cycle where there is no device, like during
+ * errors occur during a config cycle where there is no device, like during
  * the discovery stage.
  */
 static int iop3xx_pci_status(void)
@@ -223,8 +223,111 @@ struct pci_bus *iop3xx_pci_scan_bus(int nr, struct pci_sys_data *sys)
         return pci_scan_bus(sys->busnr, &iop3xx_ops, sys);
 }
 
+void __init iop3xx_atu_setup(void)
+{
+        /* BAR 0 ( Disabled ) */
+        *IOP3XX_IAUBAR0 = 0x0;
+        *IOP3XX_IABAR0  = 0x0;
+        *IOP3XX_IATVR0  = 0x0;
+        *IOP3XX_IALR0   = 0x0;
+
+        /* BAR 1 ( Disabled ) */
+        *IOP3XX_IAUBAR1 = 0x0;
+        *IOP3XX_IABAR1  = 0x0;
+        *IOP3XX_IALR1   = 0x0;
+
+        /* BAR 2 (1:1 mapping with Physical RAM) */
+        /* Set limit and enable */
+        *IOP3XX_IALR2 = ~((u32)IOP3XX_MAX_RAM_SIZE - 1) & ~0x1;
+        *IOP3XX_IAUBAR2 = 0x0;
+
+        /* Align the inbound bar with the base of memory */
+        *IOP3XX_IABAR2 = PHYS_OFFSET |
+                               PCI_BASE_ADDRESS_MEM_TYPE_64 |
+                               PCI_BASE_ADDRESS_MEM_PREFETCH;
+
+        *IOP3XX_IATVR2 = PHYS_OFFSET;
+
+        /* Outbound window 0 */
+        *IOP3XX_OMWTVR0 = IOP3XX_PCI_LOWER_MEM_PA;
+        *IOP3XX_OUMWTVR0 = 0;
+
+        /* Outbound window 1 */
+        *IOP3XX_OMWTVR1 = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE;
+        *IOP3XX_OUMWTVR1 = 0;
+
+        /* BAR 3 ( Disabled ) */
+        *IOP3XX_IAUBAR3 = 0x0;
+        *IOP3XX_IABAR3  = 0x0;
+        *IOP3XX_IATVR3  = 0x0;
+        *IOP3XX_IALR3   = 0x0;
+
+        /* Setup the I/O Bar
+         */
+        *IOP3XX_OIOWTVR = IOP3XX_PCI_LOWER_IO_PA;;
+
+        /* Enable inbound and outbound cycles
+         */
+        *IOP3XX_ATUCMD |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+                               PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
+        *IOP3XX_ATUCR |= IOP3XX_ATUCR_OUT_EN;
+}
+
+void __init iop3xx_atu_disable(void)
+{
+        *IOP3XX_ATUCMD = 0;
+        *IOP3XX_ATUCR = 0;
+
+        /* wait for cycles to quiesce */
+        while (*IOP3XX_PCSR & (IOP3XX_PCSR_OUT_Q_BUSY |
+                                     IOP3XX_PCSR_IN_Q_BUSY))
+                cpu_relax();
+
+        /* BAR 0 ( Disabled ) */
+        *IOP3XX_IAUBAR0 = 0x0;
+        *IOP3XX_IABAR0  = 0x0;
+        *IOP3XX_IATVR0  = 0x0;
+        *IOP3XX_IALR0   = 0x0;
+
+        /* BAR 1 ( Disabled ) */
+        *IOP3XX_IAUBAR1 = 0x0;
+        *IOP3XX_IABAR1  = 0x0;
+        *IOP3XX_IALR1   = 0x0;
+
+        /* BAR 2 ( Disabled ) */
+        *IOP3XX_IAUBAR2 = 0x0;
+        *IOP3XX_IABAR2  = 0x0;
+        *IOP3XX_IATVR2  = 0x0;
+        *IOP3XX_IALR2   = 0x0;
+
+        /* BAR 3 ( Disabled ) */
+        *IOP3XX_IAUBAR3 = 0x0;
+        *IOP3XX_IABAR3  = 0x0;
+        *IOP3XX_IATVR3  = 0x0;
+        *IOP3XX_IALR3   = 0x0;
+
+        /* Clear the outbound windows */
+        *IOP3XX_OIOWTVR  = 0;
+
+        /* Outbound window 0 */
+        *IOP3XX_OMWTVR0 = 0;
+        *IOP3XX_OUMWTVR0 = 0;
+
+        /* Outbound window 1 */
+        *IOP3XX_OMWTVR1 = 0;
+        *IOP3XX_OUMWTVR1 = 0;
+}
+
+/* Flag to determine whether the ATU is initialized and the PCI bus scanned */
+int init_atu;
+
 void iop3xx_pci_preinit(void)
 {
+        if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) {
+                iop3xx_atu_disable();
+                iop3xx_atu_setup();
+        }
+
         DBG("PCI:  Intel 803xx PCI init code.\n");
         DBG("ATU: IOP3XX_ATUCMD=0x%04x\n", *IOP3XX_ATUCMD);
         DBG("ATU: IOP3XX_OMWTVR0=0x%04x, IOP3XX_OIOWTVR=0x%04x\n",
@@ -245,3 +348,38 @@ void iop3xx_pci_preinit(void)
 
         hook_fault_code(16+6, iop3xx_pci_abort, SIGBUS, "imprecise external abort");
 }
+
+/* allow init_atu to be user overridden */
+static int __init iop3xx_init_atu_setup(char *str)
+{
+        init_atu = IOP3XX_INIT_ATU_DEFAULT;
+        if (str) {
+                while (*str != '\0') {
+                        switch (*str) {
+                        case 'y':
+                        case 'Y':
+                                init_atu = IOP3XX_INIT_ATU_ENABLE;
+                                break;
+                        case 'n':
+                        case 'N':
+                                init_atu = IOP3XX_INIT_ATU_DISABLE;
+                                break;
+                        case ',':
+                        case '=':
+                                break;
+                        default:
+                                printk(KERN_DEBUG "\"%s\" malformed at "
+                                            "character: \'%c\'",
+                                            __FUNCTION__,
+                                            *str);
+                                *(str + 1) = '\0';
+                        }
+                        str++;
+                }
+        }
+
+        return 1;
+}
+
+__setup("iop3xx_init_atu", iop3xx_init_atu_setup);
+