Merge branch 'linus' into timers/nohz

1 files changed, 180 insertions, 0 deletions

diff --git a/arch/arm/mach-kirkwood/pcie.c b/arch/arm/mach-kirkwood/pcie.c
new file mode 100644
index 000000000000..8282d0ff84bf
--- /dev/null
+++ b/arch/arm/mach-kirkwood/pcie.c
@@ -0,0 +1,180 @@
+/*
+ * arch/arm/mach-kirkwood/pcie.c
+ *
+ * PCIe functions for Marvell Kirkwood SoCs
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/mbus.h>
+#include <asm/mach/pci.h>
+#include <asm/plat-orion/pcie.h>
+#include "common.h"
+
+
+#define PCIE_BASE	((void __iomem *)PCIE_VIRT_BASE)
+
+static int pcie_valid_config(int bus, int dev)
+{
+	/*
+	 * Don't go out when trying to access --
+	 * 1. nonexisting device on local bus
+	 * 2. where there's no device connected (no link)
+	 */
+	if (bus == 0 && dev == 0)
+		return 1;
+
+	if (!orion_pcie_link_up(PCIE_BASE))
+		return 0;
+
+	if (bus == 0 && dev != 1)
+		return 0;
+
+	return 1;
+}
+
+
+/*
+ * PCIe config cycles are done by programming the PCIE_CONF_ADDR register
+ * and then reading the PCIE_CONF_DATA register. Need to make sure these
+ * transactions are atomic.
+ */
+static DEFINE_SPINLOCK(kirkwood_pcie_lock);
+
+static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
+			int size, u32 *val)
+{
+	unsigned long flags;
+	int ret;
+
+	if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
+		*val = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	spin_lock_irqsave(&kirkwood_pcie_lock, flags);
+	ret = orion_pcie_rd_conf(PCIE_BASE, bus, devfn, where, size, val);
+	spin_unlock_irqrestore(&kirkwood_pcie_lock, flags);
+
+	return ret;
+}
+
+static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
+			int where, int size, u32 val)
+{
+	unsigned long flags;
+	int ret;
+
+	if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	spin_lock_irqsave(&kirkwood_pcie_lock, flags);
+	ret = orion_pcie_wr_conf(PCIE_BASE, bus, devfn, where, size, val);
+	spin_unlock_irqrestore(&kirkwood_pcie_lock, flags);
+
+	return ret;
+}
+
+static struct pci_ops pcie_ops = {
+	.read = pcie_rd_conf,
+	.write = pcie_wr_conf,
+};
+
+
+static int kirkwood_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+	struct resource *res;
+
+	/*
+	 * Generic PCIe unit setup.
+	 */
+	orion_pcie_setup(PCIE_BASE, &kirkwood_mbus_dram_info);
+
+	/*
+	 * Request resources.
+	 */
+	res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
+	if (!res)
+		panic("pcie_setup unable to alloc resources");
+
+	/*
+	 * IORESOURCE_IO
+	 */
+	res[0].name = "PCIe I/O Space";
+	res[0].flags = IORESOURCE_IO;
+	res[0].start = KIRKWOOD_PCIE_IO_PHYS_BASE;
+	res[0].end = res[0].start + KIRKWOOD_PCIE_IO_SIZE - 1;
+	if (request_resource(&ioport_resource, &res[0]))
+		panic("Request PCIe IO resource failed\n");
+	sys->resource[0] = &res[0];
+
+	/*
+	 * IORESOURCE_MEM
+	 */
+	res[1].name = "PCIe Memory Space";
+	res[1].flags = IORESOURCE_MEM;
+	res[1].start = KIRKWOOD_PCIE_MEM_PHYS_BASE;
+	res[1].end = res[1].start + KIRKWOOD_PCIE_MEM_SIZE - 1;
+	if (request_resource(&iomem_resource, &res[1]))
+		panic("Request PCIe Memory resource failed\n");
+	sys->resource[1] = &res[1];
+
+	sys->resource[2] = NULL;
+	sys->io_offset = 0;
+
+	return 1;
+}
+
+static void __devinit rc_pci_fixup(struct pci_dev *dev)
+{
+	/*
+	 * Prevent enumeration of root complex.
+	 */
+	if (dev->bus->parent == NULL && dev->devfn == 0) {
+		int i;
+
+		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+			dev->resource[i].start = 0;
+			dev->resource[i].end   = 0;
+			dev->resource[i].flags = 0;
+		}
+	}
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
+
+static struct pci_bus __init *
+kirkwood_pcie_scan_bus(int nr, struct pci_sys_data *sys)
+{
+	struct pci_bus *bus;
+
+	if (nr == 0) {
+		bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
+	} else {
+		bus = NULL;
+		BUG();
+	}
+
+	return bus;
+}
+
+static int __init kirkwood_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+	return IRQ_KIRKWOOD_PCIE;
+}
+
+static struct hw_pci kirkwood_pci __initdata = {
+	.nr_controllers	= 1,
+	.swizzle	= pci_std_swizzle,
+	.setup		= kirkwood_pcie_setup,
+	.scan		= kirkwood_pcie_scan_bus,
+	.map_irq	= kirkwood_pcie_map_irq,
+};
+
+void __init kirkwood_pcie_init(void)
+{
+	pci_common_init(&kirkwood_pci);
+}