You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
475 lines
13 KiB
Diff
475 lines
13 KiB
Diff
This driver implements the hw_pci operations needed by the core ARM
|
|
PCI code to setup PCI devices and get their corresponding IRQs, and
|
|
the pci_ops operations that are used by the PCI core to read/write the
|
|
configuration space of PCI devices.
|
|
|
|
In addition, this driver enumerates the different PCIe slots, and for
|
|
those having a device plugged in, it allocates the necessary address
|
|
decoding windows, using the new armada_370_xp_alloc_pcie_window()
|
|
function from mach-mvebu/addr-map.c.
|
|
|
|
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
|
|
---
|
|
.../devicetree/bindings/pci/armada-370-xp-pcie.txt | 136 +++++++++
|
|
arch/arm/mach-mvebu/Makefile | 1 +
|
|
arch/arm/mach-mvebu/pcie.c | 306 ++++++++++++++++++++
|
|
3 files changed, 443 insertions(+)
|
|
create mode 100644 Documentation/devicetree/bindings/pci/armada-370-xp-pcie.txt
|
|
create mode 100644 arch/arm/mach-mvebu/pcie.c
|
|
|
|
--- /dev/null
|
|
+++ b/Documentation/devicetree/bindings/pci/armada-370-xp-pcie.txt
|
|
@@ -0,0 +1,136 @@
|
|
+* Marvell Armada 370/XP PCIe interfaces
|
|
+
|
|
+Mandatory properties:
|
|
+- compatible: must be "marvell,armada-370-xp-pcie"
|
|
+- status: either "disabled" or "okay"
|
|
+- #address-cells, set to <1>
|
|
+- #size-cells, set to <1>
|
|
+- ranges: describes the association between the physical addresses of
|
|
+ the PCIe registers for each PCIe interface with "virtual" addresses
|
|
+ as seen by the sub-nodes. One entry per PCIe interface. Each entry
|
|
+ must have 3 values: the "virtual" address seen by the sub-nodes, the
|
|
+ real physical address of the PCIe registers, and the size.
|
|
+
|
|
+In addition, the Device Tree node must have sub-nodes describing each
|
|
+PCIe interface, having the following mandatory properties:
|
|
+- reg: the address and size of the PCIe registers (translated
|
|
+ addresses according to the ranges property of the parent)
|
|
+- interrupts: the interrupt number of this PCIe interface
|
|
+- clocks: the clock associated to this PCIe interface
|
|
+- marvell,pcie-port: the physical PCIe port number
|
|
+- status: either "disabled" or "okay"
|
|
+
|
|
+and the following optional properties:
|
|
+- marvell,pcie-lane: the physical PCIe lane number, for ports having
|
|
+ multiple lanes. If this property is not found, we assume that the
|
|
+ value is 0.
|
|
+
|
|
+Example:
|
|
+
|
|
+pcie-controller {
|
|
+ compatible = "marvell,armada-370-xp-pcie";
|
|
+ status = "disabled";
|
|
+ #address-cells = <1>;
|
|
+ #size-cells = <1>;
|
|
+ ranges = <0 0xd0040000 0x2000 /* port0x1_port0 */
|
|
+ 0x2000 0xd0042000 0x2000 /* port2x1_port0 */
|
|
+ 0x4000 0xd0044000 0x2000 /* port0x1_port1 */
|
|
+ 0x8000 0xd0048000 0x2000 /* port0x1_port2 */
|
|
+ 0xC000 0xd004C000 0x2000 /* port0x1_port3 */
|
|
+ 0x10000 0xd0080000 0x2000 /* port1x1_port0 */
|
|
+ 0x12000 0xd0082000 0x2000 /* port3x1_port0 */
|
|
+ 0x14000 0xd0084000 0x2000 /* port1x1_port1 */
|
|
+ 0x18000 0xd0088000 0x2000 /* port1x1_port2 */
|
|
+ 0x1C000 0xd008C000 0x2000 /* port1x1_port3 */>;
|
|
+
|
|
+ pcie0.0@0xd0040000 {
|
|
+ reg = <0x0 0x2000>;
|
|
+ interrupts = <58>;
|
|
+ clocks = <&gateclk 5>;
|
|
+ marvell,pcie-port = <0>;
|
|
+ marvell,pcie-lane = <0>;
|
|
+ status = "disabled";
|
|
+ };
|
|
+
|
|
+ pcie0.1@0xd0044000 {
|
|
+ reg = <0x4000 0x2000>;
|
|
+ interrupts = <59>;
|
|
+ clocks = <&gateclk 5>;
|
|
+ marvell,pcie-port = <0>;
|
|
+ marvell,pcie-lane = <1>;
|
|
+ status = "disabled";
|
|
+ };
|
|
+
|
|
+ pcie0.2@0xd0048000 {
|
|
+ reg = <0x8000 0x2000>;
|
|
+ interrupts = <60>;
|
|
+ clocks = <&gateclk 5>;
|
|
+ marvell,pcie-port = <0>;
|
|
+ marvell,pcie-lane = <2>;
|
|
+ status = "disabled";
|
|
+ };
|
|
+
|
|
+ pcie0.3@0xd004C000 {
|
|
+ reg = <0xC000 0x2000>;
|
|
+ interrupts = <61>;
|
|
+ clocks = <&gateclk 5>;
|
|
+ marvell,pcie-port = <0>;
|
|
+ marvell,pcie-lane = <3>;
|
|
+ status = "disabled";
|
|
+ };
|
|
+
|
|
+ pcie1.0@0xd0040000 {
|
|
+ reg = <0x10000 0x2000>;
|
|
+ interrupts = <62>;
|
|
+ clocks = <&gateclk 6>;
|
|
+ marvell,pcie-port = <1>;
|
|
+ marvell,pcie-lane = <0>;
|
|
+ status = "disabled";
|
|
+ };
|
|
+
|
|
+ pcie1.1@0xd0044000 {
|
|
+ reg = <0x14000 0x2000>;
|
|
+ interrupts = <63>;
|
|
+ clocks = <&gateclk 6>;
|
|
+ marvell,pcie-port = <1>;
|
|
+ marvell,pcie-lane = <1>;
|
|
+ status = "disabled";
|
|
+ };
|
|
+
|
|
+ pcie1.2@0xd0048000 {
|
|
+ reg = <0x18000 0x2000>;
|
|
+ interrupts = <64>;
|
|
+ clocks = <&gateclk 6>;
|
|
+ marvell,pcie-port = <1>;
|
|
+ marvell,pcie-lane = <2>;
|
|
+ status = "disabled";
|
|
+ };
|
|
+
|
|
+ pcie1.3@0xd004C000 {
|
|
+ reg = <0x1C000 0x2000>;
|
|
+ interrupts = <65>;
|
|
+ clocks = <&gateclk 6>;
|
|
+ marvell,pcie-port = <1>;
|
|
+ marvell,pcie-lane = <3>;
|
|
+ status = "disabled";
|
|
+ };
|
|
+
|
|
+ pcie2@0xd0042000 {
|
|
+ reg = <0x2000 0x2000>;
|
|
+ interrupts = <99>;
|
|
+ clocks = <&gateclk 7>;
|
|
+ marvell,pcie-port = <2>;
|
|
+ marvell,pcie-lane = <0>;
|
|
+ status = "disabled";
|
|
+ };
|
|
+
|
|
+ pcie3@0xd0082000 {
|
|
+ reg = <0x12000 0x2000>;
|
|
+ interrupts = <103>;
|
|
+ clocks = <&gateclk 8>;
|
|
+ marvell,pcie-port = <3>;
|
|
+ marvell,pcie-lane = <0>;
|
|
+ status = "disabled";
|
|
+ };
|
|
+};
|
|
+
|
|
--- a/arch/arm/mach-mvebu/Makefile
|
|
+++ b/arch/arm/mach-mvebu/Makefile
|
|
@@ -5,3 +5,4 @@ obj-y += system-controller.o
|
|
obj-$(CONFIG_MACH_ARMADA_370_XP) += armada-370-xp.o irq-armada-370-xp.o addr-map.o coherency.o coherency_ll.o pmsu.o
|
|
obj-$(CONFIG_SMP) += platsmp.o headsmp.o
|
|
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
|
|
+obj-$(CONFIG_PCI) += pcie.o
|
|
--- /dev/null
|
|
+++ b/arch/arm/mach-mvebu/pcie.c
|
|
@@ -0,0 +1,306 @@
|
|
+/*
|
|
+ * PCIe driver for Marvell Armada 370 and Armada XP 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/clk.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/slab.h>
|
|
+#include <linux/platform_device.h>
|
|
+#include <linux/of_address.h>
|
|
+#include <linux/of_pci.h>
|
|
+#include <linux/of_irq.h>
|
|
+#include <linux/of_platform.h>
|
|
+#include <plat/pcie.h>
|
|
+#include "common.h"
|
|
+
|
|
+struct pcie_port {
|
|
+ u8 root_bus_nr;
|
|
+ void __iomem *base;
|
|
+ spinlock_t conf_lock;
|
|
+ int irq;
|
|
+ struct resource res;
|
|
+ int haslink;
|
|
+ u32 port;
|
|
+ u32 lane;
|
|
+ struct clk *clk;
|
|
+};
|
|
+
|
|
+static struct pcie_port *pcie_ports;
|
|
+
|
|
+static int pcie_valid_config(struct pcie_port *pp, 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 == pp->root_bus_nr && dev == 0)
|
|
+ return 1;
|
|
+
|
|
+ if (!orion_pcie_link_up(pp->base))
|
|
+ return 0;
|
|
+
|
|
+ if (bus == pp->root_bus_nr && 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 int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
|
|
+ int size, u32 *val)
|
|
+{
|
|
+ struct pci_sys_data *sys = bus->sysdata;
|
|
+ struct pcie_port *pp = sys->private_data;
|
|
+ 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 pci_sys_data *sys = bus->sysdata;
|
|
+ struct pcie_port *pp = sys->private_data;
|
|
+ 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,
|
|
+};
|
|
+
|
|
+/*
|
|
+ * Returns 0 when the device could not be initialized, 1 when
|
|
+ * initialization is successful
|
|
+ */
|
|
+static int __init armada_370_xp_pcie_setup(int nr, struct pci_sys_data *sys)
|
|
+{
|
|
+ struct pcie_port *port = &pcie_ports[nr];
|
|
+ unsigned long membase, iobase;
|
|
+ int ret;
|
|
+
|
|
+ if (!port->haslink)
|
|
+ return 0;
|
|
+
|
|
+ sys->private_data = port;
|
|
+ port->root_bus_nr = sys->busnr;
|
|
+ spin_lock_init(&port->conf_lock);
|
|
+
|
|
+ ret = armada_370_xp_alloc_pcie_window(port->port, port->lane,
|
|
+ IORESOURCE_MEM, SZ_64M, &membase);
|
|
+ if (ret) {
|
|
+ pr_err("PCIe%d.%d: Cannot get memory window, device disabled\n",
|
|
+ port->port, port->lane);
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ ret = armada_370_xp_alloc_pcie_window(port->port, port->lane,
|
|
+ IORESOURCE_IO, SZ_64K, &iobase);
|
|
+ if (ret) {
|
|
+ pr_err("PCIe%d.%d: Cannot get I/O window, device disabled\n",
|
|
+ port->port, port->lane);
|
|
+ armada_370_xp_free_pcie_window(IORESOURCE_MEM, membase, SZ_64M);
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ port->res.name = kasprintf(GFP_KERNEL, "PCIe %d.%d MEM",
|
|
+ port->port, port->lane);
|
|
+ if (!port->res.name) {
|
|
+ armada_370_xp_free_pcie_window(IORESOURCE_IO, iobase, SZ_64K);
|
|
+ armada_370_xp_free_pcie_window(IORESOURCE_MEM, membase, SZ_64M);
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ port->res.start = membase;
|
|
+ port->res.end = membase + SZ_32M - 1;
|
|
+ port->res.flags = IORESOURCE_MEM;
|
|
+
|
|
+ pci_ioremap_io(SZ_64K * sys->busnr, iobase);
|
|
+
|
|
+ if (request_resource(&iomem_resource, &port->res)) {
|
|
+ pr_err("PCIe%d.%d: Cannot request memory resource\n",
|
|
+ port->port, port->lane);
|
|
+ kfree(port->res.name);
|
|
+ armada_370_xp_free_pcie_window(IORESOURCE_IO, iobase, SZ_64K);
|
|
+ armada_370_xp_free_pcie_window(IORESOURCE_MEM, membase, SZ_64M);
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ pci_add_resource_offset(&sys->resources, &port->res, sys->mem_offset);
|
|
+
|
|
+ orion_pcie_set_local_bus_nr(port->base, sys->busnr);
|
|
+ orion_pcie_setup(port->base);
|
|
+
|
|
+ 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 int __init armada_370_xp_pcie_map_irq(const struct pci_dev *dev, u8 slot,
|
|
+ u8 pin)
|
|
+{
|
|
+ struct pci_sys_data *sys = dev->sysdata;
|
|
+ struct pcie_port *port = sys->private_data;
|
|
+
|
|
+ return port->irq;
|
|
+}
|
|
+
|
|
+static struct hw_pci armada_370_xp_pci __initdata = {
|
|
+ .setup = armada_370_xp_pcie_setup,
|
|
+ .map_irq = armada_370_xp_pcie_map_irq,
|
|
+ .ops = &pcie_ops,
|
|
+};
|
|
+
|
|
+static int __init armada_370_xp_pcie_probe(struct platform_device *pdev)
|
|
+{
|
|
+ struct device_node *child;
|
|
+ int nports, i;
|
|
+
|
|
+ nports = 0;
|
|
+ for_each_child_of_node(pdev->dev.of_node, child) {
|
|
+ if (!of_device_is_available(child))
|
|
+ continue;
|
|
+ nports++;
|
|
+ }
|
|
+
|
|
+ pcie_ports = devm_kzalloc(&pdev->dev, nports * sizeof(*pcie_ports),
|
|
+ GFP_KERNEL);
|
|
+ if (!pcie_ports)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ i = 0;
|
|
+ for_each_child_of_node(pdev->dev.of_node, child) {
|
|
+ struct pcie_port *port = &pcie_ports[i];
|
|
+
|
|
+ if (!of_device_is_available(child))
|
|
+ continue;
|
|
+
|
|
+ if (of_property_read_u32(child, "marvell,pcie-port",
|
|
+ &port->port))
|
|
+ continue;
|
|
+
|
|
+ if (of_property_read_u32(child, "marvell,pcie-lane",
|
|
+ &port->lane))
|
|
+ port->lane = 0;
|
|
+
|
|
+ port->base = of_iomap(child, 0);
|
|
+ if (!port->base) {
|
|
+ dev_err(&pdev->dev, "PCIe%d.%d: cannot map registers\n",
|
|
+ port->port, port->lane);
|
|
+ continue;
|
|
+ }
|
|
+
|
|
+ if (orion_pcie_link_up(port->base)) {
|
|
+ port->haslink = 1;
|
|
+ dev_info(&pdev->dev, "PCIe%d.%d: link up\n",
|
|
+ port->port, port->lane);
|
|
+ } else {
|
|
+ port->haslink = 0;
|
|
+ dev_info(&pdev->dev, "PCIe%d.%d: link down\n",
|
|
+ port->port, port->lane);
|
|
+ iounmap(port->base);
|
|
+ continue;
|
|
+ }
|
|
+
|
|
+ port->irq = irq_of_parse_and_map(child, 0);
|
|
+ if (port->irq == 0) {
|
|
+ dev_err(&pdev->dev, "PCIe%d.%d: cannot parse and map IRQ\n",
|
|
+ port->port, port->lane);
|
|
+ iounmap(port->base);
|
|
+ port->haslink = 0;
|
|
+ continue;
|
|
+ }
|
|
+
|
|
+ port->clk = of_clk_get_by_name(child, NULL);
|
|
+ if (!port->clk) {
|
|
+ dev_err(&pdev->dev, "PCIe%d.%d: cannot get clock\n",
|
|
+ port->port, port->lane);
|
|
+ irq_dispose_mapping(port->irq);
|
|
+ iounmap(port->base);
|
|
+ port->haslink = 0;
|
|
+ continue;
|
|
+ }
|
|
+
|
|
+ clk_prepare_enable(port->clk);
|
|
+
|
|
+ i++;
|
|
+ }
|
|
+
|
|
+ armada_370_xp_pci.nr_controllers = nports;
|
|
+ pci_common_init(&armada_370_xp_pci);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static const struct of_device_id armada_370_xp_pcie_of_match_table[] = {
|
|
+ { .compatible = "marvell,armada-370-xp-pcie", },
|
|
+ {},
|
|
+};
|
|
+MODULE_DEVICE_TABLE(of, armada_370_xp_pcie_of_match_table);
|
|
+
|
|
+static struct platform_driver armada_370_xp_pcie_driver = {
|
|
+ .driver = {
|
|
+ .owner = THIS_MODULE,
|
|
+ .name = "armada-370-xp-pcie",
|
|
+ .of_match_table =
|
|
+ of_match_ptr(armada_370_xp_pcie_of_match_table),
|
|
+ },
|
|
+};
|
|
+
|
|
+static int armada_370_xp_pcie_init(void)
|
|
+{
|
|
+ return platform_driver_probe(&armada_370_xp_pcie_driver,
|
|
+ armada_370_xp_pcie_probe);
|
|
+}
|
|
+
|
|
+subsys_initcall(armada_370_xp_pcie_init);
|
|
+
|
|
+MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");
|
|
+MODULE_DESCRIPTION("Marvell Armada 370/XP PCIe driver");
|
|
+MODULE_LICENSE("GPL");
|