diff options
Diffstat (limited to 'target/linux/mvebu/patches-3.10/0009-pci-PCIe-driver-for-Marvell-Armada-370-XP-systems.patch')
| -rw-r--r-- | target/linux/mvebu/patches-3.10/0009-pci-PCIe-driver-for-Marvell-Armada-370-XP-systems.patch | 1177 |
1 files changed, 1177 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-3.10/0009-pci-PCIe-driver-for-Marvell-Armada-370-XP-systems.patch b/target/linux/mvebu/patches-3.10/0009-pci-PCIe-driver-for-Marvell-Armada-370-XP-systems.patch new file mode 100644 index 0000000..13ddae8 --- /dev/null +++ b/target/linux/mvebu/patches-3.10/0009-pci-PCIe-driver-for-Marvell-Armada-370-XP-systems.patch @@ -0,0 +1,1177 @@ +From cf7b5cb15e46b5357c60188b75b213a7f0b5fd32 Mon Sep 17 00:00:00 2001 +From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> +Date: Fri, 18 Jan 2013 17:42:58 +0100 +Subject: [PATCH 009/203] pci: PCIe driver for Marvell Armada 370/XP systems + +This driver implements the support for the PCIe interfaces on the +Marvell Armada 370/XP ARM SoCs. In the future, it might be extended to +cover earlier families of Marvell SoCs, such as Dove, Orion and +Kirkwood. + +The 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. + +Since the PCIe interfaces of Marvell SoCs are completely separate and +not linked together in a bus, this driver sets up an emulated PCI host +bridge, with one PCI-to-PCI bridge as child for each hardware PCIe +interface. + +In addition, this driver enumerates the different PCIe slots, and for +those having a device plugged in, it sets up the necessary address +decoding windows, using the mvebu-mbus driver. + +Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> +Acked-by: Bjorn Helgaas <bhelgaas@google.com> +--- + .../devicetree/bindings/pci/mvebu-pci.txt | 220 ++++++ + drivers/pci/Kconfig | 2 + + drivers/pci/Makefile | 3 + + drivers/pci/host/Kconfig | 8 + + drivers/pci/host/Makefile | 1 + + drivers/pci/host/pci-mvebu.c | 880 +++++++++++++++++++++ + 6 files changed, 1114 insertions(+) + create mode 100644 Documentation/devicetree/bindings/pci/mvebu-pci.txt + create mode 100644 drivers/pci/host/Kconfig + create mode 100644 drivers/pci/host/Makefile + create mode 100644 drivers/pci/host/pci-mvebu.c + +--- /dev/null ++++ b/Documentation/devicetree/bindings/pci/mvebu-pci.txt +@@ -0,0 +1,220 @@ ++* Marvell EBU PCIe interfaces ++ ++Mandatory properties: ++- compatible: one of the following values: ++ marvell,armada-370-pcie ++ marvell,armada-xp-pcie ++- #address-cells, set to <3> ++- #size-cells, set to <2> ++- #interrupt-cells, set to <1> ++- bus-range: PCI bus numbers covered ++- device_type, set to "pci" ++- ranges: ranges for the PCI memory and I/O regions, as well as the ++ MMIO registers to control the PCIe interfaces. ++ ++In addition, the Device Tree node must have sub-nodes describing each ++PCIe interface, having the following mandatory properties: ++- reg: used only for interrupt mapping, so only the first four bytes ++ are used to refer to the correct bus number and device number. ++- assigned-addresses: reference to the MMIO registers used to control ++ this PCIe interface. ++- clocks: the clock associated to this PCIe interface ++- marvell,pcie-port: the physical PCIe port number ++- status: either "disabled" or "okay" ++- device_type, set to "pci" ++- #address-cells, set to <3> ++- #size-cells, set to <2> ++- #interrupt-cells, set to <1> ++- ranges, empty property. ++- interrupt-map-mask and interrupt-map, standard PCI properties to ++ define the mapping of the PCIe interface to interrupt numbers. ++ ++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-xp-pcie"; ++ status = "disabled"; ++ device_type = "pci"; ++ ++ #address-cells = <3>; ++ #size-cells = <2>; ++ ++ bus-range = <0x00 0xff>; ++ ++ ranges = <0x82000000 0 0xd0040000 0xd0040000 0 0x00002000 /* Port 0.0 registers */ ++ 0x82000000 0 0xd0042000 0xd0042000 0 0x00002000 /* Port 2.0 registers */ ++ 0x82000000 0 0xd0044000 0xd0044000 0 0x00002000 /* Port 0.1 registers */ ++ 0x82000000 0 0xd0048000 0xd0048000 0 0x00002000 /* Port 0.2 registers */ ++ 0x82000000 0 0xd004c000 0xd004c000 0 0x00002000 /* Port 0.3 registers */ ++ 0x82000000 0 0xd0080000 0xd0080000 0 0x00002000 /* Port 1.0 registers */ ++ 0x82000000 0 0xd0082000 0xd0082000 0 0x00002000 /* Port 3.0 registers */ ++ 0x82000000 0 0xd0084000 0xd0084000 0 0x00002000 /* Port 1.1 registers */ ++ 0x82000000 0 0xd0088000 0xd0088000 0 0x00002000 /* Port 1.2 registers */ ++ 0x82000000 0 0xd008c000 0xd008c000 0 0x00002000 /* Port 1.3 registers */ ++ 0x82000000 0 0xe0000000 0xe0000000 0 0x08000000 /* non-prefetchable memory */ ++ 0x81000000 0 0 0xe8000000 0 0x00100000>; /* downstream I/O */ ++ ++ pcie@1,0 { ++ device_type = "pci"; ++ assigned-addresses = <0x82000800 0 0xd0040000 0 0x2000>; ++ reg = <0x0800 0 0 0 0>; ++ #address-cells = <3>; ++ #size-cells = <2>; ++ #interrupt-cells = <1>; ++ ranges; ++ interrupt-map-mask = <0 0 0 0>; ++ interrupt-map = <0 0 0 0 &mpic 58>; ++ marvell,pcie-port = <0>; ++ marvell,pcie-lane = <0>; ++ clocks = <&gateclk 5>; ++ status = "disabled"; ++ }; ++ ++ pcie@2,0 { ++ device_type = "pci"; ++ assigned-addresses = <0x82001000 0 0xd0044000 0 0x2000>; ++ reg = <0x1000 0 0 0 0>; ++ #address-cells = <3>; ++ #size-cells = <2>; ++ #interrupt-cells = <1>; ++ ranges; ++ interrupt-map-mask = <0 0 0 0>; ++ interrupt-map = <0 0 0 0 &mpic 59>; ++ marvell,pcie-port = <0>; ++ marvell,pcie-lane = <1>; ++ clocks = <&gateclk 6>; ++ status = "disabled"; ++ }; ++ ++ pcie@3,0 { ++ device_type = "pci"; ++ assigned-addresses = <0x82001800 0 0xd0048000 0 0x2000>; ++ reg = <0x1800 0 0 0 0>; ++ #address-cells = <3>; ++ #size-cells = <2>; ++ #interrupt-cells = <1>; ++ ranges; ++ interrupt-map-mask = <0 0 0 0>; ++ interrupt-map = <0 0 0 0 &mpic 60>; ++ marvell,pcie-port = <0>; ++ marvell,pcie-lane = <2>; ++ clocks = <&gateclk 7>; ++ status = "disabled"; ++ }; ++ ++ pcie@4,0 { ++ device_type = "pci"; ++ assigned-addresses = <0x82002000 0 0xd004c000 0 0x2000>; ++ reg = <0x2000 0 0 0 0>; ++ #address-cells = <3>; ++ #size-cells = <2>; ++ #interrupt-cells = <1>; ++ ranges; ++ interrupt-map-mask = <0 0 0 0>; ++ interrupt-map = <0 0 0 0 &mpic 61>; ++ marvell,pcie-port = <0>; ++ marvell,pcie-lane = <3>; ++ clocks = <&gateclk 8>; ++ status = "disabled"; ++ }; ++ ++ pcie@5,0 { ++ device_type = "pci"; ++ assigned-addresses = <0x82002800 0 0xd0080000 0 0x2000>; ++ reg = <0x2800 0 0 0 0>; ++ #address-cells = <3>; ++ #size-cells = <2>; ++ #interrupt-cells = <1>; ++ ranges; ++ interrupt-map-mask = <0 0 0 0>; ++ interrupt-map = <0 0 0 0 &mpic 62>; ++ marvell,pcie-port = <1>; ++ marvell,pcie-lane = <0>; ++ clocks = <&gateclk 9>; ++ status = "disabled"; ++ }; ++ ++ pcie@6,0 { ++ device_type = "pci"; ++ assigned-addresses = <0x82003000 0 0xd0084000 0 0x2000>; ++ reg = <0x3000 0 0 0 0>; ++ #address-cells = <3>; ++ #size-cells = <2>; ++ #interrupt-cells = <1>; ++ ranges; ++ interrupt-map-mask = <0 0 0 0>; ++ interrupt-map = <0 0 0 0 &mpic 63>; ++ marvell,pcie-port = <1>; ++ marvell,pcie-lane = <1>; ++ clocks = <&gateclk 10>; ++ status = "disabled"; ++ }; ++ ++ pcie@7,0 { ++ device_type = "pci"; ++ assigned-addresses = <0x82003800 0 0xd0088000 0 0x2000>; ++ reg = <0x3800 0 0 0 0>; ++ #address-cells = <3>; ++ #size-cells = <2>; ++ #interrupt-cells = <1>; ++ ranges; ++ interrupt-map-mask = <0 0 0 0>; ++ interrupt-map = <0 0 0 0 &mpic 64>; ++ marvell,pcie-port = <1>; ++ marvell,pcie-lane = <2>; ++ clocks = <&gateclk 11>; ++ status = "disabled"; ++ }; ++ ++ pcie@8,0 { ++ device_type = "pci"; ++ assigned-addresses = <0x82004000 0 0xd008c000 0 0x2000>; ++ reg = <0x4000 0 0 0 0>; ++ #address-cells = <3>; ++ #size-cells = <2>; ++ #interrupt-cells = <1>; ++ ranges; ++ interrupt-map-mask = <0 0 0 0>; ++ interrupt-map = <0 0 0 0 &mpic 65>; ++ marvell,pcie-port = <1>; ++ marvell,pcie-lane = <3>; ++ clocks = <&gateclk 12>; ++ status = "disabled"; ++ }; ++ pcie@9,0 { ++ device_type = "pci"; ++ assigned-addresses = <0x82004800 0 0xd0042000 0 0x2000>; ++ reg = <0x4800 0 0 0 0>; ++ #address-cells = <3>; ++ #size-cells = <2>; ++ #interrupt-cells = <1>; ++ ranges; ++ interrupt-map-mask = <0 0 0 0>; ++ interrupt-map = <0 0 0 0 &mpic 99>; ++ marvell,pcie-port = <2>; ++ marvell,pcie-lane = <0>; ++ clocks = <&gateclk 26>; ++ status = "disabled"; ++ }; ++ ++ pcie@10,0 { ++ device_type = "pci"; ++ assigned-addresses = <0x82005000 0 0xd0082000 0 0x2000>; ++ reg = <0x5000 0 0 0 0>; ++ #address-cells = <3>; ++ #size-cells = <2>; ++ #interrupt-cells = <1>; ++ ranges; ++ interrupt-map-mask = <0 0 0 0>; ++ interrupt-map = <0 0 0 0 &mpic 103>; ++ marvell,pcie-port = <3>; ++ marvell,pcie-lane = <0>; ++ clocks = <&gateclk 27>; ++ status = "disabled"; ++ }; ++}; +--- a/drivers/pci/Kconfig ++++ b/drivers/pci/Kconfig +@@ -125,3 +125,5 @@ config PCI_IOAPIC + config PCI_LABEL + def_bool y if (DMI || ACPI) + select NLS ++ ++source "drivers/pci/host/Kconfig" +--- a/drivers/pci/Makefile ++++ b/drivers/pci/Makefile +@@ -67,3 +67,6 @@ obj-$(CONFIG_XEN_PCIDEV_FRONTEND) += xen + obj-$(CONFIG_OF) += of.o + + ccflags-$(CONFIG_PCI_DEBUG) := -DDEBUG ++ ++# PCI host controller drivers ++obj-y += host/ +--- /dev/null ++++ b/drivers/pci/host/Kconfig +@@ -0,0 +1,8 @@ ++menu "PCI host controller drivers" ++ depends on PCI ++ ++config PCI_MVEBU ++ bool "Marvell EBU PCIe controller" ++ depends on ARCH_MVEBU ++ ++endmenu +--- /dev/null ++++ b/drivers/pci/host/Makefile +@@ -0,0 +1 @@ ++obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o +--- /dev/null ++++ b/drivers/pci/host/pci-mvebu.c +@@ -0,0 +1,880 @@ ++/* ++ * 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/mbus.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> ++ ++/* ++ * PCIe unit register offsets. ++ */ ++#define PCIE_DEV_ID_OFF 0x0000 ++#define PCIE_CMD_OFF 0x0004 ++#define PCIE_DEV_REV_OFF 0x0008 ++#define PCIE_BAR_LO_OFF(n) (0x0010 + ((n) << 3)) ++#define PCIE_BAR_HI_OFF(n) (0x0014 + ((n) << 3)) ++#define PCIE_HEADER_LOG_4_OFF 0x0128 ++#define PCIE_BAR_CTRL_OFF(n) (0x1804 + (((n) - 1) * 4)) ++#define PCIE_WIN04_CTRL_OFF(n) (0x1820 + ((n) << 4)) ++#define PCIE_WIN04_BASE_OFF(n) (0x1824 + ((n) << 4)) ++#define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4)) ++#define PCIE_WIN5_CTRL_OFF 0x1880 ++#define PCIE_WIN5_BASE_OFF 0x1884 ++#define PCIE_WIN5_REMAP_OFF 0x188c ++#define PCIE_CONF_ADDR_OFF 0x18f8 ++#define PCIE_CONF_ADDR_EN 0x80000000 ++#define PCIE_CONF_REG(r) ((((r) & 0xf00) << 16) | ((r) & 0xfc)) ++#define PCIE_CONF_BUS(b) (((b) & 0xff) << 16) ++#define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11) ++#define PCIE_CONF_FUNC(f) (((f) & 0x7) << 8) ++#define PCIE_CONF_ADDR(bus, devfn, where) \ ++ (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \ ++ PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where) | \ ++ PCIE_CONF_ADDR_EN) ++#define PCIE_CONF_DATA_OFF 0x18fc ++#define PCIE_MASK_OFF 0x1910 ++#define PCIE_MASK_ENABLE_INTS 0x0f000000 ++#define PCIE_CTRL_OFF 0x1a00 ++#define PCIE_CTRL_X1_MODE 0x0001 ++#define PCIE_STAT_OFF 0x1a04 ++#define PCIE_STAT_BUS 0xff00 ++#define PCIE_STAT_LINK_DOWN BIT(0) ++#define PCIE_DEBUG_CTRL 0x1a60 ++#define PCIE_DEBUG_SOFT_RESET BIT(20) ++ ++/* ++ * This product ID is registered by Marvell, and used when the Marvell ++ * SoC is not the root complex, but an endpoint on the PCIe bus. It is ++ * therefore safe to re-use this PCI ID for our emulated PCI-to-PCI ++ * bridge. ++ */ ++#define MARVELL_EMULATED_PCI_PCI_BRIDGE_ID 0x7846 ++ ++/* PCI configuration space of a PCI-to-PCI bridge */ ++struct mvebu_sw_pci_bridge { ++ u16 vendor; ++ u16 device; ++ u16 command; ++ u16 status; ++ u16 class; ++ u8 interface; ++ u8 revision; ++ u8 bist; ++ u8 header_type; ++ u8 latency_timer; ++ u8 cache_line_size; ++ u32 bar[2]; ++ u8 primary_bus; ++ u8 secondary_bus; ++ u8 subordinate_bus; ++ u8 secondary_latency_timer; ++ u8 iobase; ++ u8 iolimit; ++ u16 secondary_status; ++ u16 membase; ++ u16 memlimit; ++ u16 prefmembase; ++ u16 prefmemlimit; ++ u32 prefbaseupper; ++ u32 preflimitupper; ++ u16 iobaseupper; ++ u16 iolimitupper; ++ u8 cappointer; ++ u8 reserved1; ++ u16 reserved2; ++ u32 romaddr; ++ u8 intline; ++ u8 intpin; ++ u16 bridgectrl; ++}; ++ ++struct mvebu_pcie_port; ++ ++/* Structure representing all PCIe interfaces */ ++struct mvebu_pcie { ++ struct platform_device *pdev; ++ struct mvebu_pcie_port *ports; ++ struct resource io; ++ struct resource realio; ++ struct resource mem; ++ struct resource busn; ++ int nports; ++}; ++ ++/* Structure representing one PCIe interface */ ++struct mvebu_pcie_port { ++ char *name; ++ void __iomem *base; ++ spinlock_t conf_lock; ++ int haslink; ++ u32 port; ++ u32 lane; ++ int devfn; ++ struct clk *clk; ++ struct mvebu_sw_pci_bridge bridge; ++ struct device_node *dn; ++ struct mvebu_pcie *pcie; ++ phys_addr_t memwin_base; ++ size_t memwin_size; ++ phys_addr_t iowin_base; ++ size_t iowin_size; ++}; ++ ++static bool mvebu_pcie_link_up(struct mvebu_pcie_port *port) ++{ ++ return !(readl(port->base + PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN); ++} ++ ++static void mvebu_pcie_set_local_bus_nr(struct mvebu_pcie_port *port, int nr) ++{ ++ u32 stat; ++ ++ stat = readl(port->base + PCIE_STAT_OFF); ++ stat &= ~PCIE_STAT_BUS; ++ stat |= nr << 8; ++ writel(stat, port->base + PCIE_STAT_OFF); ++} ++ ++/* ++ * Setup PCIE BARs and Address Decode Wins: ++ * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks ++ * WIN[0-3] -> DRAM bank[0-3] ++ */ ++static void __init mvebu_pcie_setup_wins(struct mvebu_pcie_port *port) ++{ ++ const struct mbus_dram_target_info *dram; ++ u32 size; ++ int i; ++ ++ dram = mv_mbus_dram_info(); ++ ++ /* First, disable and clear BARs and windows. */ ++ for (i = 1; i < 3; i++) { ++ writel(0, port->base + PCIE_BAR_CTRL_OFF(i)); ++ writel(0, port->base + PCIE_BAR_LO_OFF(i)); ++ writel(0, port->base + PCIE_BAR_HI_OFF(i)); ++ } ++ ++ for (i = 0; i < 5; i++) { ++ writel(0, port->base + PCIE_WIN04_CTRL_OFF(i)); ++ writel(0, port->base + PCIE_WIN04_BASE_OFF(i)); ++ writel(0, port->base + PCIE_WIN04_REMAP_OFF(i)); ++ } ++ ++ writel(0, port->base + PCIE_WIN5_CTRL_OFF); ++ writel(0, port->base + PCIE_WIN5_BASE_OFF); ++ writel(0, port->base + PCIE_WIN5_REMAP_OFF); ++ ++ /* Setup windows for DDR banks. Count total DDR size on the fly. */ ++ size = 0; ++ for (i = 0; i < dram->num_cs; i++) { ++ const struct mbus_dram_window *cs = dram->cs + i; ++ ++ writel(cs->base & 0xffff0000, ++ port->base + PCIE_WIN04_BASE_OFF(i)); ++ writel(0, port->base + PCIE_WIN04_REMAP_OFF(i)); ++ writel(((cs->size - 1) & 0xffff0000) | ++ (cs->mbus_attr << 8) | ++ (dram->mbus_dram_target_id << 4) | 1, ++ port->base + PCIE_WIN04_CTRL_OFF(i)); ++ ++ size += cs->size; ++ } ++ ++ /* Round up 'size' to the nearest power of two. */ ++ if ((size & (size - 1)) != 0) ++ size = 1 << fls(size); ++ ++ /* Setup BAR[1] to all DRAM banks. */ ++ writel(dram->cs[0].base, port->base + PCIE_BAR_LO_OFF(1)); ++ writel(0, port->base + PCIE_BAR_HI_OFF(1)); ++ writel(((size - 1) & 0xffff0000) | 1, ++ port->base + PCIE_BAR_CTRL_OFF(1)); ++} ++ ++static void __init mvebu_pcie_setup_hw(struct mvebu_pcie_port *port) ++{ ++ u16 cmd; ++ u32 mask; ++ ++ /* Point PCIe unit MBUS decode windows to DRAM space. */ ++ mvebu_pcie_setup_wins(port); ++ ++ /* Master + slave enable. */ ++ cmd = readw(port->base + PCIE_CMD_OFF); ++ cmd |= PCI_COMMAND_IO; ++ cmd |= PCI_COMMAND_MEMORY; ++ cmd |= PCI_COMMAND_MASTER; ++ writew(cmd, port->base + PCIE_CMD_OFF); ++ ++ /* Enable interrupt lines A-D. */ ++ mask = readl(port->base + PCIE_MASK_OFF); ++ mask |= PCIE_MASK_ENABLE_INTS; ++ writel(mask, port->base + PCIE_MASK_OFF); ++} ++ ++static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port, ++ struct pci_bus *bus, ++ u32 devfn, int where, int size, u32 *val) ++{ ++ writel(PCIE_CONF_ADDR(bus->number, devfn, where), ++ port->base + PCIE_CONF_ADDR_OFF); ++ ++ *val = readl(port->base + PCIE_CONF_DATA_OFF); ++ ++ if (size == 1) ++ *val = (*val >> (8 * (where & 3))) & 0xff; ++ else if (size == 2) ++ *val = (*val >> (8 * (where & 3))) & 0xffff; ++ ++ return PCIBIOS_SUCCESSFUL; ++} ++ ++static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port, ++ struct pci_bus *bus, ++ u32 devfn, int where, int size, u32 val) ++{ ++ int ret = PCIBIOS_SUCCESSFUL; ++ ++ writel(PCIE_CONF_ADDR(bus->number, devfn, where), ++ port->base + PCIE_CONF_ADDR_OFF); ++ ++ if (size == 4) ++ writel(val, port->base + PCIE_CONF_DATA_OFF); ++ else if (size == 2) ++ writew(val, port->base + PCIE_CONF_DATA_OFF + (where & 3)); ++ else if (size == 1) ++ writeb(val, port->base + PCIE_CONF_DATA_OFF + (where & 3)); ++ else ++ ret = PCIBIOS_BAD_REGISTER_NUMBER; ++ ++ return ret; ++} ++ ++static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port) ++{ ++ phys_addr_t iobase; ++ ++ /* Are the new iobase/iolimit values invalid? */ ++ if (port->bridge.iolimit < port->bridge.iobase || ++ port->bridge.iolimitupper < port->bridge.iobaseupper) { ++ ++ /* If a window was configured, remove it */ ++ if (port->iowin_base) { ++ mvebu_mbus_del_window(port->iowin_base, ++ port->iowin_size); ++ port->iowin_base = 0; ++ port->iowin_size = 0; ++ } ++ ++ return; ++ } ++ ++ /* ++ * We read the PCI-to-PCI bridge emulated registers, and ++ * calculate the base address and size of the address decoding ++ * window to setup, according to the PCI-to-PCI bridge ++ * specifications. iobase is the bus address, port->iowin_base ++ * is the CPU address. ++ */ ++ iobase = ((port->bridge.iobase & 0xF0) << 8) | ++ (port->bridge.iobaseupper << 16); ++ port->iowin_base = port->pcie->io.start + iobase; ++ port->iowin_size = ((0xFFF | ((port->bridge.iolimit & 0xF0) << 8) | ++ (port->bridge.iolimitupper << 16)) - ++ iobase); ++ ++ mvebu_mbus_add_window_remap_flags(port->name, port->iowin_base, ++ port->iowin_size, ++ iobase, ++ MVEBU_MBUS_PCI_IO); ++ ++ pci_ioremap_io(iobase, port->iowin_base); ++} ++ ++static void mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port) ++{ ++ /* Are the new membase/memlimit values invalid? */ ++ if (port->bridge.memlimit < port->bridge.membase) { ++ ++ /* If a window was configured, remove it */ ++ if (port->memwin_base) { ++ mvebu_mbus_del_window(port->memwin_base, ++ port->memwin_size); ++ port->memwin_base = 0; ++ port->memwin_size = 0; ++ } ++ ++ return; ++ } ++ ++ /* ++ * We read the PCI-to-PCI bridge emulated registers, and ++ * calculate the base address and size of the address decoding ++ * window to setup, according to the PCI-to-PCI bridge ++ * specifications. ++ */ ++ port->memwin_base = ((port->bridge.membase & 0xFFF0) << 16); ++ port->memwin_size = ++ (((port->bridge.memlimit & 0xFFF0) << 16) | 0xFFFFF) - ++ port->memwin_base; ++ ++ mvebu_mbus_add_window_remap_flags(port->name, port->memwin_base, ++ port->memwin_size, ++ MVEBU_MBUS_NO_REMAP, ++ MVEBU_MBUS_PCI_MEM); ++} ++ ++/* ++ * Initialize the configuration space of the PCI-to-PCI bridge ++ * associated with the given PCIe interface. ++ */ ++static void mvebu_sw_pci_bridge_init(struct mvebu_pcie_port *port) ++{ ++ struct mvebu_sw_pci_bridge *bridge = &port->bridge; ++ ++ memset(bridge, 0, sizeof(struct mvebu_sw_pci_bridge)); ++ ++ bridge->status = PCI_STATUS_CAP_LIST; ++ bridge->class = PCI_CLASS_BRIDGE_PCI; ++ bridge->vendor = PCI_VENDOR_ID_MARVELL; ++ bridge->device = MARVELL_EMULATED_PCI_PCI_BRIDGE_ID; ++ bridge->header_type = PCI_HEADER_TYPE_BRIDGE; ++ bridge->cache_line_size = 0x10; ++ ++ /* We support 32 bits I/O addressing */ ++ bridge->iobase = PCI_IO_RANGE_TYPE_32; ++ bridge->iolimit = PCI_IO_RANGE_TYPE_32; ++} ++ ++/* ++ * Read the configuration space of the PCI-to-PCI bridge associated to ++ * the given PCIe interface. ++ */ ++static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port, ++ unsigned int where, int size, u32 *value) ++{ ++ struct mvebu_sw_pci_bridge *bridge = &port->bridge; ++ ++ switch (where & ~3) { ++ case PCI_VENDOR_ID: ++ *value = bridge->device << 16 | bridge->vendor; ++ break; ++ ++ case PCI_COMMAND: ++ *value = bridge->status << 16 | bridge->command; ++ break; ++ ++ case PCI_CLASS_REVISION: ++ *value = bridge->class << 16 | bridge->interface << 8 | ++ bridge->revision; ++ break; ++ ++ case PCI_CACHE_LINE_SIZE: ++ *value = bridge->bist << 24 | bridge->header_type << 16 | ++ bridge->latency_timer << 8 | bridge->cache_line_size; ++ break; ++ ++ case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1: ++ *value = bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4]; ++ break; ++ ++ case PCI_PRIMARY_BUS: ++ *value = (bridge->secondary_latency_timer << 24 | ++ bridge->subordinate_bus << 16 | ++ bridge->secondary_bus << 8 | ++ bridge->primary_bus); ++ break; ++ ++ case PCI_IO_BASE: ++ *value = (bridge->secondary_status << 16 | ++ bridge->iolimit << 8 | ++ bridge->iobase); ++ break; ++ ++ case PCI_MEMORY_BASE: ++ *value = (bridge->memlimit << 16 | bridge->membase); ++ break; ++ ++ case PCI_PREF_MEMORY_BASE: ++ *value = (bridge->prefmemlimit << 16 | bridge->prefmembase); ++ break; ++ ++ case PCI_PREF_BASE_UPPER32: ++ *value = bridge->prefbaseupper; ++ break; ++ ++ case PCI_PREF_LIMIT_UPPER32: ++ *value = bridge->preflimitupper; ++ break; ++ ++ case PCI_IO_BASE_UPPER16: ++ *value = (bridge->iolimitupper << 16 | bridge->iobaseupper); ++ break; ++ ++ case PCI_ROM_ADDRESS1: ++ *value = 0; ++ break; ++ ++ default: ++ *value = 0xffffffff; ++ return PCIBIOS_BAD_REGISTER_NUMBER; ++ } ++ ++ if (size == 2) ++ *value = (*value >> (8 * (where & 3))) & 0xffff; ++ else if (size == 1) ++ *value = (*value >> (8 * (where & 3))) & 0xff; ++ ++ return PCIBIOS_SUCCESSFUL; ++} ++ ++/* Write to the PCI-to-PCI bridge configuration space */ ++static int mvebu_sw_pci_bridge_write(struct mvebu_pcie_port *port, ++ unsigned int where, int size, u32 value) ++{ ++ struct mvebu_sw_pci_bridge *bridge = &port->bridge; ++ u32 mask, reg; ++ int err; ++ ++ if (size == 4) ++ mask = 0x0; ++ else if (size == 2) ++ mask = ~(0xffff << ((where & 3) * 8)); ++ else if (size == 1) ++ mask = ~(0xff << ((where & 3) * 8)); ++ else ++ return PCIBIOS_BAD_REGISTER_NUMBER; ++ ++ err = mvebu_sw_pci_bridge_read(port, where & ~3, 4, ®); ++ if (err) ++ return err; ++ ++ value = (reg & mask) | value << ((where & 3) * 8); ++ ++ switch (where & ~3) { ++ case PCI_COMMAND: ++ bridge->command = value & 0xffff; ++ bridge->status = value >> 16; ++ break; ++ ++ case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1: ++ bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4] = value; ++ break; ++ ++ case PCI_IO_BASE: ++ /* ++ * We also keep bit 1 set, it is a read-only bit that ++ * indicates we support 32 bits addressing for the ++ * I/O ++ */ ++ bridge->iobase = (value & 0xff) | PCI_IO_RANGE_TYPE_32; ++ bridge->iolimit = ((value >> 8) & 0xff) | PCI_IO_RANGE_TYPE_32; ++ bridge->secondary_status = value >> 16; ++ mvebu_pcie_handle_iobase_change(port); ++ break; ++ ++ case PCI_MEMORY_BASE: ++ bridge->membase = value & 0xffff; ++ bridge->memlimit = value >> 16; ++ mvebu_pcie_handle_membase_change(port); ++ break; ++ ++ case PCI_PREF_MEMORY_BASE: ++ bridge->prefmembase = value & 0xffff; ++ bridge->prefmemlimit = value >> 16; ++ break; ++ ++ case PCI_PREF_BASE_UPPER32: ++ bridge->prefbaseupper = value; ++ break; ++ ++ case PCI_PREF_LIMIT_UPPER32: ++ bridge->preflimitupper = value; ++ break; ++ ++ case PCI_IO_BASE_UPPER16: ++ bridge->iobaseupper = value & 0xffff; ++ bridge->iolimitupper = value >> 16; ++ mvebu_pcie_handle_iobase_change(port); ++ break; ++ ++ case PCI_PRIMARY_BUS: ++ bridge->primary_bus = value & 0xff; ++ bridge->secondary_bus = (value >> 8) & 0xff; ++ bridge->subordinate_bus = (value >> 16) & 0xff; ++ bridge->secondary_latency_timer = (value >> 24) & 0xff; ++ mvebu_pcie_set_local_bus_nr(port, bridge->secondary_bus); ++ break; ++ ++ default: ++ break; ++ } ++ ++ return PCIBIOS_SUCCESSFUL; ++} ++ ++static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys) ++{ ++ return sys->private_data; ++} ++ ++static struct mvebu_pcie_port * ++mvebu_pcie_find_port(struct mvebu_pcie *pcie, struct pci_bus *bus, ++ int devfn) ++{ ++ int i; ++ ++ for (i = 0; i < pcie->nports; i++) { ++ struct mvebu_pcie_port *port = &pcie->ports[i]; ++ if (bus->number == 0 && port->devfn == devfn) ++ return port; ++ if (bus->number != 0 && ++ port->bridge.secondary_bus == bus->number) ++ return port; ++ } ++ ++ return NULL; ++} ++ ++/* PCI configuration space write function */ ++static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn, ++ int where, int size, u32 val) ++{ ++ struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata); ++ struct mvebu_pcie_port *port; ++ unsigned long flags; ++ int ret; ++ ++ port = mvebu_pcie_find_port(pcie, bus, devfn); ++ if (!port) ++ return PCIBIOS_DEVICE_NOT_FOUND; ++ ++ /* Access the emulated PCI-to-PCI bridge */ ++ if (bus->number == 0) ++ return mvebu_sw_pci_bridge_write(port, where, size, val); ++ ++ if (!port->haslink || PCI_SLOT(devfn) != 0) ++ return PCIBIOS_DEVICE_NOT_FOUND; ++ ++ /* Access the real PCIe interface */ ++ spin_lock_irqsave(&port->conf_lock, flags); ++ ret = mvebu_pcie_hw_wr_conf(port, bus, ++ PCI_DEVFN(1, PCI_FUNC(devfn)), ++ where, size, val); ++ spin_unlock_irqrestore(&port->conf_lock, flags); ++ ++ return ret; ++} ++ ++/* PCI configuration space read function */ ++static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where, ++ int size, u32 *val) ++{ ++ struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata); ++ struct mvebu_pcie_port *port; ++ unsigned long flags; ++ int ret; ++ ++ port = mvebu_pcie_find_port(pcie, bus, devfn); ++ if (!port) { ++ *val = 0xffffffff; ++ return PCIBIOS_DEVICE_NOT_FOUND; ++ } ++ ++ /* Access the emulated PCI-to-PCI bridge */ ++ if (bus->number == 0) ++ return mvebu_sw_pci_bridge_read(port, where, size, val); ++ ++ if (!port->haslink || PCI_SLOT(devfn) != 0) { ++ *val = 0xffffffff; ++ return PCIBIOS_DEVICE_NOT_FOUND; ++ } ++ ++ /* Access the real PCIe interface */ ++ spin_lock_irqsave(&port->conf_lock, flags); ++ ret = mvebu_pcie_hw_rd_conf(port, bus, ++ PCI_DEVFN(1, PCI_FUNC(devfn)), ++ where, size, val); ++ spin_unlock_irqrestore(&port->conf_lock, flags); ++ ++ return ret; ++} ++ ++static struct pci_ops mvebu_pcie_ops = { ++ .read = mvebu_pcie_rd_conf, ++ .write = mvebu_pcie_wr_conf, ++}; ++ ++static int __init mvebu_pcie_setup(int nr, struct pci_sys_data *sys) ++{ ++ struct mvebu_pcie *pcie = sys_to_pcie(sys); ++ int i; ++ ++ pci_add_resource_offset(&sys->resources, &pcie->realio, sys->io_offset); ++ pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset); ++ pci_add_resource(&sys->resources, &pcie->busn); ++ ++ for (i = 0; i < pcie->nports; i++) { ++ struct mvebu_pcie_port *port = &pcie->ports[i]; ++ mvebu_pcie_setup_hw(port); ++ } ++ ++ return 1; ++} ++ ++static int __init mvebu_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) ++{ ++ struct of_irq oirq; ++ int ret; ++ ++ ret = of_irq_map_pci(dev, &oirq); ++ if (ret) ++ return ret; ++ ++ return irq_create_of_mapping(oirq.controller, oirq.specifier, ++ oirq.size); ++} ++ ++static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys) ++{ ++ struct mvebu_pcie *pcie = sys_to_pcie(sys); ++ struct pci_bus *bus; ++ ++ bus = pci_create_root_bus(&pcie->pdev->dev, sys->busnr, ++ &mvebu_pcie_ops, sys, &sys->resources); ++ if (!bus) ++ return NULL; ++ ++ pci_scan_child_bus(bus); ++ ++ return bus; ++} ++ ++resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev, ++ const struct resource *res, ++ resource_size_t start, ++ resource_size_t size, ++ resource_size_t align) ++{ ++ if (dev->bus->number != 0) ++ return start; ++ ++ /* ++ * On the PCI-to-PCI bridge side, the I/O windows must have at ++ * least a 64 KB size and be aligned on their size, and the ++ * memory windows must have at least a 1 MB size and be ++ * aligned on their size ++ */ ++ if (res->flags & IORESOURCE_IO) ++ return round_up(start, max((resource_size_t)SZ_64K, size)); ++ else if (res->flags & IORESOURCE_MEM) ++ return round_up(start, max((resource_size_t)SZ_1M, size)); ++ else ++ return start; ++} ++ ++static void __init mvebu_pcie_enable(struct mvebu_pcie *pcie) ++{ ++ struct hw_pci hw; ++ ++ memset(&hw, 0, sizeof(hw)); ++ ++ hw.nr_controllers = 1; ++ hw.private_data = (void **)&pcie; ++ hw.setup = mvebu_pcie_setup; ++ hw.scan = mvebu_pcie_scan_bus; ++ hw.map_irq = mvebu_pcie_map_irq; ++ hw.ops = &mvebu_pcie_ops; ++ hw.align_resource = mvebu_pcie_align_resource; ++ ++ pci_common_init(&hw); ++} ++ ++/* ++ * Looks up the list of register addresses encoded into the reg = ++ * <...> property for one that matches the given port/lane. Once ++ * found, maps it. ++ */ ++static void __iomem * __init ++mvebu_pcie_map_registers(struct platform_device *pdev, ++ struct device_node *np, ++ struct mvebu_pcie_port *port) ++{ ++ struct resource regs; ++ int ret = 0; ++ ++ ret = of_address_to_resource(np, 0, ®s); ++ if (ret) ++ return NULL; ++ ++ return devm_request_and_ioremap(&pdev->dev, ®s); ++} ++ ++static int __init mvebu_pcie_probe(struct platform_device *pdev) ++{ ++ struct mvebu_pcie *pcie; ++ struct device_node *np = pdev->dev.of_node; ++ struct of_pci_range range; ++ struct of_pci_range_parser parser; ++ struct device_node *child; ++ int i, ret; ++ ++ pcie = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pcie), ++ GFP_KERNEL); ++ if (!pcie) ++ return -ENOMEM; ++ ++ pcie->pdev = pdev; ++ ++ if (of_pci_range_parser_init(&parser, np)) ++ return -EINVAL; ++ ++ /* Get the I/O and memory ranges from DT */ ++ for_each_of_pci_range(&parser, &range) { ++ unsigned long restype = range.flags & IORESOURCE_TYPE_BITS; ++ if (restype == IORESOURCE_IO) { ++ of_pci_range_to_resource(&range, np, &pcie->io); ++ of_pci_range_to_resource(&range, np, &pcie->realio); ++ pcie->io.name = "I/O"; ++ pcie->realio.start = max_t(resource_size_t, ++ PCIBIOS_MIN_IO, ++ range.pci_addr); ++ pcie->realio.end = min_t(resource_size_t, ++ IO_SPACE_LIMIT, ++ range.pci_addr + range.size); ++ } ++ if (restype == IORESOURCE_MEM) { ++ of_pci_range_to_resource(&range, np, &pcie->mem); ++ pcie->mem.name = "MEM"; ++ } ++ } ++ ++ /* Get the bus range */ ++ ret = of_pci_parse_bus_range(np, &pcie->busn); ++ if (ret) { ++ dev_err(&pdev->dev, "failed to parse bus-range property: %d\n", ++ ret); ++ return ret; ++ } ++ ++ for_each_child_of_node(pdev->dev.of_node, child) { ++ if (!of_device_is_available(child)) ++ continue; ++ pcie->nports++; ++ } ++ ++ pcie->ports = devm_kzalloc(&pdev->dev, pcie->nports * ++ sizeof(struct mvebu_pcie_port), ++ GFP_KERNEL); ++ if (!pcie->ports) ++ return -ENOMEM; ++ ++ i = 0; ++ for_each_child_of_node(pdev->dev.of_node, child) { ++ struct mvebu_pcie_port *port = &pcie->ports[i]; ++ ++ if (!of_device_is_available(child)) ++ continue; ++ ++ port->pcie = pcie; ++ ++ if (of_property_read_u32(child, "marvell,pcie-port", ++ &port->port)) { ++ dev_warn(&pdev->dev, ++ "ignoring PCIe DT node, missing pcie-port property\n"); ++ continue; ++ } ++ ++ if (of_property_read_u32(child, "marvell,pcie-lane", ++ &port->lane)) ++ port->lane = 0; ++ ++ port->name = kasprintf(GFP_KERNEL, "pcie%d.%d", ++ port->port, port->lane); ++ ++ port->devfn = of_pci_get_devfn(child); ++ if (port->devfn < 0) ++ continue; ++ ++ port->base = mvebu_pcie_map_registers(pdev, child, port); ++ if (!port->base) { ++ dev_err(&pdev->dev, "PCIe%d.%d: cannot map registers\n", ++ port->port, port->lane); ++ continue; ++ } ++ ++ if (mvebu_pcie_link_up(port)) { ++ 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); ++ } ++ ++ 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); ++ iounmap(port->base); ++ port->haslink = 0; ++ continue; ++ } ++ ++ port->dn = child; ++ ++ clk_prepare_enable(port->clk); ++ spin_lock_init(&port->conf_lock); ++ ++ mvebu_sw_pci_bridge_init(port); ++ ++ i++; ++ } ++ ++ mvebu_pcie_enable(pcie); ++ ++ return 0; ++} ++ ++static const struct of_device_id mvebu_pcie_of_match_table[] = { ++ { .compatible = "marvell,armada-xp-pcie", }, ++ { .compatible = "marvell,armada-370-pcie", }, ++ {}, ++}; ++MODULE_DEVICE_TABLE(of, mvebu_pcie_of_match_table); ++ ++static struct platform_driver mvebu_pcie_driver = { ++ .driver = { ++ .owner = THIS_MODULE, ++ .name = "mvebu-pcie", ++ .of_match_table = ++ of_match_ptr(mvebu_pcie_of_match_table), ++ }, ++}; ++ ++static int __init mvebu_pcie_init(void) ++{ ++ return platform_driver_probe(&mvebu_pcie_driver, ++ mvebu_pcie_probe); ++} ++ ++subsys_initcall(mvebu_pcie_init); ++ ++MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>"); ++MODULE_DESCRIPTION("Marvell EBU PCIe driver"); ++MODULE_LICENSE("GPLv2"); |