summaryrefslogtreecommitdiff
path: root/arch/arm/mach-mv78xx0/pcie.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-mv78xx0/pcie.c')
-rw-r--r--arch/arm/mach-mv78xx0/pcie.c312
1 files changed, 312 insertions, 0 deletions
diff --git a/arch/arm/mach-mv78xx0/pcie.c b/arch/arm/mach-mv78xx0/pcie.c
new file mode 100644
index 000000000000..b78e1443159f
--- /dev/null
+++ b/arch/arm/mach-mv78xx0/pcie.c
@@ -0,0 +1,312 @@
+/*
+ * arch/arm/mach-mv78xx0/pcie.c
+ *
+ * PCIe functions for Marvell MV78xx0 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"
+
+struct pcie_port {
+ u8 maj;
+ u8 min;
+ u8 root_bus_nr;
+ void __iomem *base;
+ spinlock_t conf_lock;
+ char io_space_name[16];
+ char mem_space_name[16];
+ struct resource res[2];
+};
+
+static struct pcie_port pcie_port[8];
+static int num_pcie_ports;
+static struct resource pcie_io_space;
+static struct resource pcie_mem_space;
+
+
+static void __init mv78xx0_pcie_preinit(void)
+{
+ int i;
+ u32 size_each;
+ u32 start;
+ int win;
+
+ pcie_io_space.name = "PCIe I/O Space";
+ pcie_io_space.start = MV78XX0_PCIE_IO_PHYS_BASE(0);
+ pcie_io_space.end =
+ MV78XX0_PCIE_IO_PHYS_BASE(0) + MV78XX0_PCIE_IO_SIZE * 8 - 1;
+ pcie_io_space.flags = IORESOURCE_IO;
+ if (request_resource(&iomem_resource, &pcie_io_space))
+ panic("can't allocate PCIe I/O space");
+
+ pcie_mem_space.name = "PCIe MEM Space";
+ pcie_mem_space.start = MV78XX0_PCIE_MEM_PHYS_BASE;
+ pcie_mem_space.end =
+ MV78XX0_PCIE_MEM_PHYS_BASE + MV78XX0_PCIE_MEM_SIZE - 1;
+ pcie_mem_space.flags = IORESOURCE_MEM;
+ if (request_resource(&iomem_resource, &pcie_mem_space))
+ panic("can't allocate PCIe MEM space");
+
+ for (i = 0; i < num_pcie_ports; i++) {
+ struct pcie_port *pp = pcie_port + i;
+
+ snprintf(pp->io_space_name, sizeof(pp->io_space_name),
+ "PCIe %d.%d I/O", pp->maj, pp->min);
+ pp->io_space_name[sizeof(pp->io_space_name) - 1] = 0;
+ pp->res[0].name = pp->io_space_name;
+ pp->res[0].start = MV78XX0_PCIE_IO_PHYS_BASE(i);
+ pp->res[0].end = pp->res[0].start + MV78XX0_PCIE_IO_SIZE - 1;
+ pp->res[0].flags = IORESOURCE_IO;
+
+ snprintf(pp->mem_space_name, sizeof(pp->mem_space_name),
+ "PCIe %d.%d MEM", pp->maj, pp->min);
+ pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0;
+ pp->res[1].name = pp->mem_space_name;
+ pp->res[1].flags = IORESOURCE_MEM;
+ }
+
+ switch (num_pcie_ports) {
+ case 0:
+ size_each = 0;
+ break;
+
+ case 1:
+ size_each = 0x30000000;
+ break;
+
+ case 2 ... 3:
+ size_each = 0x10000000;
+ break;
+
+ case 4 ... 6:
+ size_each = 0x08000000;
+ break;
+
+ case 7:
+ size_each = 0x04000000;
+ break;
+
+ default:
+ panic("invalid number of PCIe ports");
+ }
+
+ start = MV78XX0_PCIE_MEM_PHYS_BASE;
+ for (i = 0; i < num_pcie_ports; i++) {
+ struct pcie_port *pp = pcie_port + i;
+
+ pp->res[1].start = start;
+ pp->res[1].end = start + size_each - 1;
+ start += size_each;
+ }
+
+ for (i = 0; i < num_pcie_ports; i++) {
+ struct pcie_port *pp = pcie_port + i;
+
+ if (request_resource(&pcie_io_space, &pp->res[0]))
+ panic("can't allocate PCIe I/O sub-space");
+
+ if (request_resource(&pcie_mem_space, &pp->res[1]))
+ panic("can't allocate PCIe MEM sub-space");
+ }
+
+ win = 0;
+ for (i = 0; i < num_pcie_ports; i++) {
+ struct pcie_port *pp = pcie_port + i;
+
+ mv78xx0_setup_pcie_io_win(win++, pp->res[0].start,
+ pp->res[0].end - pp->res[0].start + 1,
+ pp->maj, pp->min);
+
+ mv78xx0_setup_pcie_mem_win(win++, pp->res[1].start,
+ pp->res[1].end - pp->res[1].start + 1,
+ pp->maj, pp->min);
+ }
+}
+
+static int __init mv78xx0_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+ struct pcie_port *pp;
+
+ if (nr >= num_pcie_ports)
+ return 0;
+
+ pp = &pcie_port[nr];
+ pp->root_bus_nr = sys->busnr;
+
+ /*
+ * Generic PCIe unit setup.
+ */
+ orion_pcie_set_local_bus_nr(pp->base, sys->busnr);
+ orion_pcie_setup(pp->base, &mv78xx0_mbus_dram_info);
+
+ sys->resource[0] = &pp->res[0];
+ sys->resource[1] = &pp->res[1];
+ sys->resource[2] = NULL;
+
+ return 1;
+}
+
+static struct pcie_port *bus_to_port(int bus)
+{
+ int i;
+
+ for (i = num_pcie_ports - 1; i >= 0; i--) {
+ int rbus = pcie_port[i].root_bus_nr;
+ if (rbus != -1 && rbus <= bus)
+ break;
+ }
+
+ return i >= 0 ? pcie_port + i : NULL;
+}
+
+static int pcie_valid_config(struct pcie_port *pp, int bus, int dev)
+{
+ /*
+ * Don't go out when trying to access nonexisting devices
+ * on the local bus.
+ */
+ if (bus == pp->root_bus_nr && dev > 1)
+ return 0;
+
+ return 1;
+}
+
+static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
+ int size, u32 *val)
+{
+ struct pcie_port *pp = bus_to_port(bus->number);
+ unsigned long flags;
+ int ret;
+
+ if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0) {
+ *val = 0xffffffff;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+
+ spin_lock_irqsave(&pp->conf_lock, flags);
+ ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val);
+ spin_unlock_irqrestore(&pp->conf_lock, flags);
+
+ return ret;
+}
+
+static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
+ int where, int size, u32 val)
+{
+ struct pcie_port *pp = bus_to_port(bus->number);
+ unsigned long flags;
+ int ret;
+
+ if (pcie_valid_config(pp, bus->number, PCI_SLOT(devfn)) == 0)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ spin_lock_irqsave(&pp->conf_lock, flags);
+ ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val);
+ spin_unlock_irqrestore(&pp->conf_lock, flags);
+
+ return ret;
+}
+
+static struct pci_ops pcie_ops = {
+ .read = pcie_rd_conf,
+ .write = pcie_wr_conf,
+};
+
+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 *
+mv78xx0_pcie_scan_bus(int nr, struct pci_sys_data *sys)
+{
+ struct pci_bus *bus;
+
+ if (nr < num_pcie_ports) {
+ bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
+ } else {
+ bus = NULL;
+ BUG();
+ }
+
+ return bus;
+}
+
+static int __init mv78xx0_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+ struct pcie_port *pp = bus_to_port(dev->bus->number);
+
+ return IRQ_MV78XX0_PCIE_00 + (pp->maj << 2) + pp->min;
+}
+
+static struct hw_pci mv78xx0_pci __initdata = {
+ .nr_controllers = 8,
+ .preinit = mv78xx0_pcie_preinit,
+ .swizzle = pci_std_swizzle,
+ .setup = mv78xx0_pcie_setup,
+ .scan = mv78xx0_pcie_scan_bus,
+ .map_irq = mv78xx0_pcie_map_irq,
+};
+
+static void __init add_pcie_port(int maj, int min, unsigned long base)
+{
+ printk(KERN_INFO "MV78xx0 PCIe port %d.%d: ", maj, min);
+
+ if (orion_pcie_link_up((void __iomem *)base)) {
+ struct pcie_port *pp = &pcie_port[num_pcie_ports++];
+
+ printk("link up\n");
+
+ pp->maj = maj;
+ pp->min = min;
+ pp->root_bus_nr = -1;
+ pp->base = (void __iomem *)base;
+ spin_lock_init(&pp->conf_lock);
+ memset(pp->res, 0, sizeof(pp->res));
+ } else {
+ printk("link down, ignoring\n");
+ }
+}
+
+void __init mv78xx0_pcie_init(int init_port0, int init_port1)
+{
+ if (init_port0) {
+ add_pcie_port(0, 0, PCIE00_VIRT_BASE);
+ if (!orion_pcie_x4_mode((void __iomem *)PCIE00_VIRT_BASE)) {
+ add_pcie_port(0, 1, PCIE01_VIRT_BASE);
+ add_pcie_port(0, 2, PCIE02_VIRT_BASE);
+ add_pcie_port(0, 3, PCIE03_VIRT_BASE);
+ }
+ }
+
+ if (init_port1) {
+ add_pcie_port(1, 0, PCIE10_VIRT_BASE);
+ if (!orion_pcie_x4_mode((void __iomem *)PCIE10_VIRT_BASE)) {
+ add_pcie_port(1, 1, PCIE11_VIRT_BASE);
+ add_pcie_port(1, 2, PCIE12_VIRT_BASE);
+ add_pcie_port(1, 3, PCIE13_VIRT_BASE);
+ }
+ }
+
+ pci_common_init(&mv78xx0_pci);
+}