From: Rob Herring <robh@xxxxxxxxxx> This converts the Versatile PCI host code to a platform driver using of_create_pci_host_bridge for parsing DT and setup. I think more of this setup could be done by the core code. There are accesses to the host's config space (accesses using local_pci_cfg_base) which seem like they could be done by the core code or using standard config space accessors. The problem is bridge->bus->self is needed, but it does not get setup. I'm not exactly sure how that should work. Signed-off-by: Rob Herring <robh@xxxxxxxxxx> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> --- drivers/pci/host/Kconfig | 4 + drivers/pci/host/Makefile | 1 + drivers/pci/host/pci-versatile.c | 275 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 280 insertions(+) create mode 100644 drivers/pci/host/pci-versatile.c diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig index 47d46c6..b4dd911 100644 --- a/drivers/pci/host/Kconfig +++ b/drivers/pci/host/Kconfig @@ -33,4 +33,8 @@ config PCI_RCAR_GEN2 There are 3 internal PCI controllers available with a single built-in EHCI/OHCI host controller present on each one. +config PCI_VERSATILE + bool "ARM Versatile PB PCI controller" + depends on ARCH_VERSATILE + endmenu diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile index 13fb333..fe67ab3 100644 --- a/drivers/pci/host/Makefile +++ b/drivers/pci/host/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_PCI_IMX6) += pci-imx6.o obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o +obj-$(CONFIG_PCI_VERSATILE) += pci-versatile.o diff --git a/drivers/pci/host/pci-versatile.c b/drivers/pci/host/pci-versatile.c new file mode 100644 index 0000000..98abd1f --- /dev/null +++ b/drivers/pci/host/pci-versatile.c @@ -0,0 +1,275 @@ +/* + * Copyright 2004 Koninklijke Philips Electronics NV + * + * Conversion to platform driver and DT: + * Copyright 2014 Linaro Ltd. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * 14/04/2005 Initial version, colin.king@xxxxxxxxxxx + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/of_pci.h> +#include <linux/of_platform.h> +#include <linux/pci.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +static void __iomem *versatile_pci_base; +static void __iomem *versatile_cfg_base[2]; + +#define PCI_IMAP(m) (versatile_pci_base + ((m) * 4)) +#define PCI_SMAP(m) (versatile_pci_base + 0x14 + ((m) * 4)) +#define PCI_SELFID (versatile_pci_base + 0xc) + +#define DEVICE_ID_OFFSET 0x00 +#define CSR_OFFSET 0x04 +#define CLASS_ID_OFFSET 0x08 + +#define VP_PCI_DEVICE_ID 0x030010ee +#define VP_PCI_CLASS_ID 0x0b400000 + +static unsigned long pci_slot_ignore; + +static int __init versatile_pci_slot_ignore(char *str) +{ + int retval; + int slot; + + while ((retval = get_option(&str, &slot))) { + if ((slot < 0) || (slot > 31)) + pr_err("Illegal slot value: %d\n", slot); + else + pci_slot_ignore |= (1 << slot); + } + return 1; +} + +__setup("pci_slot_ignore=", versatile_pci_slot_ignore); + + +static void __iomem *__pci_addr(struct pci_bus *bus, + unsigned int devfn, int offset) +{ + unsigned int busnr = bus->number; + + /* + * Trap out illegal values + */ + BUG_ON(offset > 255); + BUG_ON(busnr > 255); + BUG_ON(devfn > 255); + + return versatile_cfg_base[1] + ((busnr << 16) | + (PCI_SLOT(devfn) << 11) | (PCI_FUNC(devfn) << 8) | offset); +} + +static int versatile_read_config(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 *val) +{ + void __iomem *addr = __pci_addr(bus, devfn, where & ~3); + u32 v; + int slot = PCI_SLOT(devfn); + + if (pci_slot_ignore & (1 << slot)) { + /* Ignore this slot */ + v = (1 << (8 * size)) - 1; + } else { + switch (size) { + case 1: + v = readl(addr); + if (where & 2) + v >>= 16; + if (where & 1) + v >>= 8; + v &= 0xff; + break; + + case 2: + v = readl(addr); + if (where & 2) + v >>= 16; + v &= 0xffff; + break; + + default: + v = readl(addr); + break; + } + } + + *val = v; + return PCIBIOS_SUCCESSFUL; +} + +static int versatile_write_config(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 val) +{ + void __iomem *addr = __pci_addr(bus, devfn, where); + int slot = PCI_SLOT(devfn); + + if (pci_slot_ignore & (1 << slot)) + return PCIBIOS_SUCCESSFUL; + + switch (size) { + case 1: + writeb((u8)val, addr); + break; + + case 2: + writew((u16)val, addr); + break; + + case 4: + writel(val, addr); + break; + } + + return PCIBIOS_SUCCESSFUL; +} + +static struct pci_ops pci_versatile_ops = { + .read = versatile_read_config, + .write = versatile_write_config, +}; + +static const struct of_device_id versatile_pci_of_match[] = { + { .compatible = "arm,versatile-pci", }, + { }, +}; +MODULE_DEVICE_TABLE(of, versatile_pci_of_match); + +/* Unused, temporary to satisfy ARM arch code */ +struct pci_sys_data sys; + +static int versatile_pci_probe(struct platform_device *pdev) +{ + struct resource *res; + int ret, i, mem = 1, myslot = -1; + unsigned int lastbus; + u32 val; + struct pci_host_bridge *bridge; + void __iomem *local_pci_cfg_base; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + versatile_pci_base = devm_ioremap_resource(&pdev->dev, res); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res) + return -ENODEV; + versatile_cfg_base[0] = devm_ioremap_resource(&pdev->dev, res); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 2); + if (!res) + return -ENODEV; + versatile_cfg_base[1] = devm_ioremap_resource(&pdev->dev, res); + + bridge = of_create_pci_host_bridge(&pdev->dev, &pci_versatile_ops, &sys); + if (!bridge) + return -ENODEV; + + /* + * We need to discover the PCI core first to configure itself + * before the main PCI probing is performed + */ + for (i = 0; i < 32; i++) { + if ((readl(versatile_cfg_base[0] + (i << 11) + DEVICE_ID_OFFSET) == VP_PCI_DEVICE_ID) && + (readl(versatile_cfg_base[0] + (i << 11) + CLASS_ID_OFFSET) == VP_PCI_CLASS_ID)) { + myslot = i; + break; + } + } + if (myslot == -1) { + dev_err(&pdev->dev, "Cannot find PCI core!\n"); + ret = -EIO; + goto out; + } + /* + * Do not to map Versatile FPGA PCI device into memory space + */ + pci_slot_ignore |= (1 << myslot); + + dev_info(&pdev->dev, "PCI core found (slot %d)\n", myslot); + + writel(myslot, PCI_SELFID); + local_pci_cfg_base = versatile_cfg_base[1] + (myslot << 11); + + val = readl(local_pci_cfg_base + CSR_OFFSET); + val |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE; + writel(val, local_pci_cfg_base + CSR_OFFSET); + + /* + * Configure the PCI inbound memory windows to be 1:1 mapped to SDRAM + */ + writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_0); + writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_1); + writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_2); + + /* + * For many years the kernel and QEMU were symbiotically buggy + * in that they both assumed the same broken IRQ mapping. + * QEMU therefore attempts to auto-detect old broken kernels + * so that they still work on newer QEMU as they did on old + * QEMU. Since we now use the correct (ie matching-hardware) + * IRQ mapping we write a definitely different value to a + * PCI_INTERRUPT_LINE register to tell QEMU that we expect + * real hardware behaviour and it need not be backwards + * compatible for us. This write is harmless on real hardware. + */ + writel(0, versatile_cfg_base[0] + PCI_INTERRUPT_LINE); + + pci_bus_for_each_resource(bridge->bus, res, i) { + if (!res || (resource_type(res) != IORESOURCE_MEM)) + continue; + + writel(res->start >> 28, PCI_IMAP(mem)); + writel(PHYS_OFFSET >> 28, PCI_SMAP(mem)); + + mem++; + } + + pci_ioremap_io(0, bridge->io_base); + + /* We always enable PCI domains and we keep domain 0 backward + * compatible in /proc for video cards + */ + pci_add_flags(PCI_ENABLE_PROC_DOMAINS); + pci_add_flags(PCI_REASSIGN_ALL_BUS | PCI_REASSIGN_ALL_RSRC); + + lastbus = pci_scan_child_bus(bridge->bus); + pci_bus_update_busn_res_end(bridge->bus, lastbus); + + pci_assign_unassigned_bus_resources(bridge->bus); + + pci_bus_add_devices(bridge->bus); + + return 0; + + out: + return ret; +} + +static struct platform_driver versatile_pci_driver = { + .driver = { + .name = "versatile-pci", + .owner = THIS_MODULE, + .of_match_table = versatile_pci_of_match, + .suppress_bind_attrs = true, + }, + .probe = versatile_pci_probe, +}; +module_platform_driver(versatile_pci_driver); + +MODULE_DESCRIPTION("Versatile PCI driver"); +MODULE_LICENSE("GPLv2"); -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html