[ARM] add Marvell Kirkwood (88F6000) SoC support

The Marvell Kirkwood (88F6000) is a family of ARM SoCs based on a
Shiva CPU core, and features a DDR2 controller, a x1 PCIe interface,
a USB 2.0 interface, a SPI controller, a crypto accelerator, a TS
interface, and IDMA/XOR engines, and depending on the model, also
features one or two Gigabit Ethernet interfaces, two SATA II
interfaces, one or two TWSI interfaces, one or two UARTs, a
TDM/SLIC interface, a NAND controller, an I2S/SPDIF interface, and
an SDIO interface.

This patch adds supports for the Marvell DB-88F6281-BP Development
Board and the RD-88F6192-NAS and the RD-88F6281 Reference Designs,
enabling support for the PCIe interface, the USB interface, the
ethernet interfaces, the SATA interfaces, the TWSI interfaces, the
UARTs, and the NAND controller.

Signed-off-by: Saeed Bishara <saeed@marvell.com>
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>

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);
+}