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-rw-r--r--arch/arm/mach-ixp2000/ixdp2800.c147
1 files changed, 134 insertions, 13 deletions
diff --git a/arch/arm/mach-ixp2000/ixdp2800.c b/arch/arm/mach-ixp2000/ixdp2800.c
index c4683aaff84..aec13c7108a 100644
--- a/arch/arm/mach-ixp2000/ixdp2800.c
+++ b/arch/arm/mach-ixp2000/ixdp2800.c
@@ -65,19 +65,102 @@ static struct sys_timer ixdp2800_timer = {
/*************************************************************************
* IXDP2800 PCI
*************************************************************************/
+static void __init ixdp2800_slave_disable_pci_master(void)
+{
+ *IXP2000_PCI_CMDSTAT &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
+}
+
+static void __init ixdp2800_master_wait_for_slave(void)
+{
+ volatile u32 *addr;
+
+ printk(KERN_INFO "IXDP2800: waiting for slave NPU to configure "
+ "its BAR sizes\n");
+
+ addr = ixp2000_pci_config_addr(0, IXDP2X00_SLAVE_NPU_DEVFN,
+ PCI_BASE_ADDRESS_1);
+ do {
+ *addr = 0xffffffff;
+ cpu_relax();
+ } while (*addr != 0xfe000008);
+
+ addr = ixp2000_pci_config_addr(0, IXDP2X00_SLAVE_NPU_DEVFN,
+ PCI_BASE_ADDRESS_2);
+ do {
+ *addr = 0xffffffff;
+ cpu_relax();
+ } while (*addr != 0xc0000008);
+
+ /*
+ * Configure the slave's SDRAM BAR by hand.
+ */
+ *addr = 0x40000008;
+}
+
+static void __init ixdp2800_slave_wait_for_master_enable(void)
+{
+ printk(KERN_INFO "IXDP2800: waiting for master NPU to enable us\n");
+
+ while ((*IXP2000_PCI_CMDSTAT & PCI_COMMAND_MASTER) == 0)
+ cpu_relax();
+}
+
void __init ixdp2800_pci_preinit(void)
{
printk("ixdp2x00_pci_preinit called\n");
- *IXP2000_PCI_ADDR_EXT = 0x0000e000;
+ *IXP2000_PCI_ADDR_EXT = 0x0001e000;
+
+ if (!ixdp2x00_master_npu())
+ ixdp2800_slave_disable_pci_master();
- *IXP2000_PCI_DRAM_BASE_ADDR_MASK = (0x40000000 - 1) & ~0xfffff;
*IXP2000_PCI_SRAM_BASE_ADDR_MASK = (0x2000000 - 1) & ~0x3ffff;
+ *IXP2000_PCI_DRAM_BASE_ADDR_MASK = (0x40000000 - 1) & ~0xfffff;
ixp2000_pci_preinit();
+
+ if (ixdp2x00_master_npu()) {
+ /*
+ * Wait until the slave set its SRAM/SDRAM BAR sizes
+ * correctly before we proceed to scan and enumerate
+ * the bus.
+ */
+ ixdp2800_master_wait_for_slave();
+
+ /*
+ * We configure the SDRAM BARs by hand because they
+ * are 1G and fall outside of the regular allocated
+ * PCI address space.
+ */
+ *IXP2000_PCI_SDRAM_BAR = 0x00000008;
+ } else {
+ /*
+ * Wait for the master to complete scanning the bus
+ * and assigning resources before we proceed to scan
+ * the bus ourselves. Set pci=firmware to honor the
+ * master's resource assignment.
+ */
+ ixdp2800_slave_wait_for_master_enable();
+ pcibios_setup("firmware");
+ }
}
-int ixdp2800_pci_setup(int nr, struct pci_sys_data *sys)
+/*
+ * We assign the SDRAM BARs for the two IXP2800 CPUs by hand, outside
+ * of the regular PCI window, because there's only 512M of outbound PCI
+ * memory window on each IXP, while we need 1G for each of the BARs.
+ */
+static void __devinit ixp2800_pci_fixup(struct pci_dev *dev)
+{
+ if (machine_is_ixdp2800()) {
+ dev->resource[2].start = 0;
+ dev->resource[2].end = 0;
+ dev->resource[2].flags = 0;
+ }
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IXP2800, ixp2800_pci_fixup);
+
+static int __init ixdp2800_pci_setup(int nr, struct pci_sys_data *sys)
{
sys->mem_offset = 0x00000000;
@@ -129,22 +212,47 @@ static int __init ixdp2800_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
} else return IRQ_IXP2000_PCIB; /* Slave NIC interrupt */
}
-static void ixdp2800_pci_postinit(void)
+static void __init ixdp2800_master_enable_slave(void)
{
- struct pci_dev *dev;
+ volatile u32 *addr;
- if (ixdp2x00_master_npu()) {
- dev = pci_find_slot(1, IXDP2800_SLAVE_ENET_DEVFN);
- pci_remove_bus_device(dev);
- } else {
- dev = pci_find_slot(1, IXDP2800_MASTER_ENET_DEVFN);
- pci_remove_bus_device(dev);
+ printk(KERN_INFO "IXDP2800: enabling slave NPU\n");
+
+ addr = (volatile u32 *)ixp2000_pci_config_addr(0,
+ IXDP2X00_SLAVE_NPU_DEVFN,
+ PCI_COMMAND);
+
+ *addr |= PCI_COMMAND_MASTER;
+}
+static void __init ixdp2800_master_wait_for_slave_bus_scan(void)
+{
+ volatile u32 *addr;
+
+ printk(KERN_INFO "IXDP2800: waiting for slave to finish bus scan\n");
+
+ addr = (volatile u32 *)ixp2000_pci_config_addr(0,
+ IXDP2X00_SLAVE_NPU_DEVFN,
+ PCI_COMMAND);
+ while ((*addr & PCI_COMMAND_MEMORY) == 0)
+ cpu_relax();
+}
+
+static void __init ixdp2800_slave_signal_bus_scan_completion(void)
+{
+ printk(KERN_INFO "IXDP2800: bus scan done, signaling master\n");
+ *IXP2000_PCI_CMDSTAT |= PCI_COMMAND_MEMORY;
+}
+
+static void __init ixdp2800_pci_postinit(void)
+{
+ if (!ixdp2x00_master_npu()) {
ixdp2x00_slave_pci_postinit();
+ ixdp2800_slave_signal_bus_scan_completion();
}
}
-struct hw_pci ixdp2800_pci __initdata = {
+struct __initdata hw_pci ixdp2800_pci __initdata = {
.nr_controllers = 1,
.setup = ixdp2800_pci_setup,
.preinit = ixdp2800_pci_preinit,
@@ -155,8 +263,21 @@ struct hw_pci ixdp2800_pci __initdata = {
int __init ixdp2800_pci_init(void)
{
- if (machine_is_ixdp2800())
+ if (machine_is_ixdp2800()) {
+ struct pci_dev *dev;
+
pci_common_init(&ixdp2800_pci);
+ if (ixdp2x00_master_npu()) {
+ dev = pci_find_slot(1, IXDP2800_SLAVE_ENET_DEVFN);
+ pci_remove_bus_device(dev);
+
+ ixdp2800_master_enable_slave();
+ ixdp2800_master_wait_for_slave_bus_scan();
+ } else {
+ dev = pci_find_slot(1, IXDP2800_MASTER_ENET_DEVFN);
+ pci_remove_bus_device(dev);
+ }
+ }
return 0;
}