OpenCloudOS-Kernel/drivers/pci/host/pci-versatile.c

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/*
* 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@philips.com
*/
#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>
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 VP_PCI_DEVICE_ID 0x030010ee
#define VP_PCI_CLASS_ID 0x0b400000
static u32 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 *versatile_map_bus(struct pci_bus *bus,
unsigned int devfn, int offset)
{
unsigned int busnr = bus->number;
if (pci_slot_ignore & (1 << PCI_SLOT(devfn)))
return NULL;
return versatile_cfg_base[1] + ((busnr << 16) | (devfn << 8) | offset);
}
static struct pci_ops pci_versatile_ops = {
.map_bus = versatile_map_bus,
.read = pci_generic_config_read32,
.write = pci_generic_config_write,
};
static int versatile_pci_parse_request_of_pci_ranges(struct device *dev,
struct list_head *res)
{
int err, mem = 1, res_valid = 0;
struct device_node *np = dev->of_node;
resource_size_t iobase;
ACPI and power management updates for v3.20-rc1 - Rework of the core ACPI resources parsing code to fix issues in it and make using resource offsets more convenient and consolidation of some resource-handing code in a couple of places that have grown analagous data structures and code to cover the the same gap in the core (Jiang Liu, Thomas Gleixner, Lv Zheng). - ACPI-based IOAPIC hotplug support on top of the resources handling rework (Jiang Liu, Yinghai Lu). - ACPICA update to upstream release 20150204 including an interrupt handling rework that allows drivers to install raw handlers for ACPI GPEs which then become entirely responsible for the given GPE and the ACPICA core code won't touch it (Lv Zheng, David E Box, Octavian Purdila). - ACPI EC driver rework to fix several concurrency issues and other problems related to events handling on top of the ACPICA's new support for raw GPE handlers (Lv Zheng). - New ACPI driver for AMD SoCs analogous to the LPSS (Low-Power Subsystem) driver for Intel chips (Ken Xue). - Two minor fixes of the ACPI LPSS driver (Heikki Krogerus, Jarkko Nikula). - Two new blacklist entries for machines (Samsung 730U3E/740U3E and 510R) where the native backlight interface doesn't work correctly while the ACPI one does (Hans de Goede). - Rework of the ACPI processor driver's handling of idle states to make the code more straightforward and less bloated overall (Rafael J Wysocki). - Assorted minor fixes related to ACPI and SFI (Andreas Ruprecht, Andy Shevchenko, Hanjun Guo, Jan Beulich, Rafael J Wysocki, Yaowei Bai). - PCI core power management modification to avoid resuming (some) runtime-suspended devices during system suspend if they are in the right states already (Rafael J Wysocki). - New SFI-based cpufreq driver for Intel platforms using SFI (Srinidhi Kasagar). - cpufreq core fixes, cleanups and simplifications (Viresh Kumar, Doug Anderson, Wolfram Sang). - SkyLake CPU support and other updates for the intel_pstate driver (Kristen Carlson Accardi, Srinivas Pandruvada). - cpufreq-dt driver cleanup (Markus Elfring). - Init fix for the ARM big.LITTLE cpuidle driver (Sudeep Holla). - Generic power domains core code fixes and cleanups (Ulf Hansson). - Operating Performance Points (OPP) core code cleanups and kernel documentation update (Nishanth Menon). - New dabugfs interface to make the list of PM QoS constraints available to user space (Nishanth Menon). - New devfreq driver for Tegra Activity Monitor (Tomeu Vizoso). - New devfreq class (devfreq_event) to provide raw utilization data to devfreq governors (Chanwoo Choi). - Assorted minor fixes and cleanups related to power management (Andreas Ruprecht, Krzysztof Kozlowski, Rickard Strandqvist, Pavel Machek, Todd E Brandt, Wonhong Kwon). - turbostat updates (Len Brown) and cpupower Makefile improvement (Sriram Raghunathan). / -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAABCAAGBQJU2neOAAoJEILEb/54YlRx51QP/jrv1Wb5eMaemzMksPIWI5Zn I8IbxzToxu7wDDsrTBRv+LuyllMPrnppFOHHvB35gUYu7Y6I066s3ErwuqeFlbmy +VicmyGMahv3yN74qg49MXzWtaJZa8hrFXn8ItujiUIcs08yELi0vBQFlZImIbTB PdQngO88VfiOVjDvmKkYUU//9Sc9LCU0ZcdUQXSnA1oNOxuUHjiARz98R03hhSqu BWR+7M0uaFbu6XeK+BExMXJTpKicIBZ1GAF6hWrS8V4aYg+hH1cwjf2neDAzZkcU UkXieJlLJrCq+ZBNcy7WEhkWQkqJNWei5WYiy6eoQeQpNoliY2V+2OtSMJaKqDye PIiMwXstyDc5rgyULN0d1UUzY6mbcUt2rOL0VN2bsFVIJ1HWCq8mr8qq689pQUYv tcH18VQ2/6r2zW28sTO/ByWLYomklD/Y6bw2onMhGx3Knl0D8xYJKapVnTGhr5eY d4k41ybHSWNKfXsZxdJc+RxndhPwj9rFLfvY/CZEhLcW+2pAiMarRDOPXDoUI7/l aJpmPzy/6mPXGBnTfr6jKDSY3gXNazRIvfPbAdiGayKcHcdRM4glbSbNH0/h1Iq6 HKa8v9Fx87k1X5r4ZbhiPdABWlxuKDiM7725rfGpvjlWC3GNFOq7YTVMOuuBA225 Mu9PRZbOsZsnyNkixBpX =zZER -----END PGP SIGNATURE----- Merge tag 'pm+acpi-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull ACPI and power management updates from Rafael Wysocki: "We have a few new features this time, including a new SFI-based cpufreq driver, a new devfreq driver for Tegra Activity Monitor, a new devfreq class for providing its governors with raw utilization data and a new ACPI driver for AMD SoCs. Still, the majority of changes here are reworks of existing code to make it more straightforward or to prepare it for implementing new features on top of it. The primary example is the rework of ACPI resources handling from Jiang Liu, Thomas Gleixner and Lv Zheng with support for IOAPIC hotplug implemented on top of it, but there is quite a number of changes of this kind in the cpufreq core, ACPICA, ACPI EC driver, ACPI processor driver and the generic power domains core code too. The most active developer is Viresh Kumar with his cpufreq changes. Specifics: - Rework of the core ACPI resources parsing code to fix issues in it and make using resource offsets more convenient and consolidation of some resource-handing code in a couple of places that have grown analagous data structures and code to cover the the same gap in the core (Jiang Liu, Thomas Gleixner, Lv Zheng). - ACPI-based IOAPIC hotplug support on top of the resources handling rework (Jiang Liu, Yinghai Lu). - ACPICA update to upstream release 20150204 including an interrupt handling rework that allows drivers to install raw handlers for ACPI GPEs which then become entirely responsible for the given GPE and the ACPICA core code won't touch it (Lv Zheng, David E Box, Octavian Purdila). - ACPI EC driver rework to fix several concurrency issues and other problems related to events handling on top of the ACPICA's new support for raw GPE handlers (Lv Zheng). - New ACPI driver for AMD SoCs analogous to the LPSS (Low-Power Subsystem) driver for Intel chips (Ken Xue). - Two minor fixes of the ACPI LPSS driver (Heikki Krogerus, Jarkko Nikula). - Two new blacklist entries for machines (Samsung 730U3E/740U3E and 510R) where the native backlight interface doesn't work correctly while the ACPI one does (Hans de Goede). - Rework of the ACPI processor driver's handling of idle states to make the code more straightforward and less bloated overall (Rafael J Wysocki). - Assorted minor fixes related to ACPI and SFI (Andreas Ruprecht, Andy Shevchenko, Hanjun Guo, Jan Beulich, Rafael J Wysocki, Yaowei Bai). - PCI core power management modification to avoid resuming (some) runtime-suspended devices during system suspend if they are in the right states already (Rafael J Wysocki). - New SFI-based cpufreq driver for Intel platforms using SFI (Srinidhi Kasagar). - cpufreq core fixes, cleanups and simplifications (Viresh Kumar, Doug Anderson, Wolfram Sang). - SkyLake CPU support and other updates for the intel_pstate driver (Kristen Carlson Accardi, Srinivas Pandruvada). - cpufreq-dt driver cleanup (Markus Elfring). - Init fix for the ARM big.LITTLE cpuidle driver (Sudeep Holla). - Generic power domains core code fixes and cleanups (Ulf Hansson). - Operating Performance Points (OPP) core code cleanups and kernel documentation update (Nishanth Menon). - New dabugfs interface to make the list of PM QoS constraints available to user space (Nishanth Menon). - New devfreq driver for Tegra Activity Monitor (Tomeu Vizoso). - New devfreq class (devfreq_event) to provide raw utilization data to devfreq governors (Chanwoo Choi). - Assorted minor fixes and cleanups related to power management (Andreas Ruprecht, Krzysztof Kozlowski, Rickard Strandqvist, Pavel Machek, Todd E Brandt, Wonhong Kwon). - turbostat updates (Len Brown) and cpupower Makefile improvement (Sriram Raghunathan)" * tag 'pm+acpi-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (151 commits) tools/power turbostat: relax dependency on APERF_MSR tools/power turbostat: relax dependency on invariant TSC Merge branch 'pci/host-generic' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci into acpi-resources tools/power turbostat: decode MSR_*_PERF_LIMIT_REASONS tools/power turbostat: relax dependency on root permission ACPI / video: Add disable_native_backlight quirk for Samsung 510R ACPI / PM: Remove unneeded nested #ifdef USB / PM: Remove unneeded #ifdef and associated dead code intel_pstate: provide option to only use intel_pstate with HWP ACPI / EC: Add GPE reference counting debugging messages ACPI / EC: Add query flushing support ACPI / EC: Refine command storm prevention support ACPI / EC: Add command flushing support. ACPI / EC: Introduce STARTED/STOPPED flags to replace BLOCKED flag ACPI: add AMD ACPI2Platform device support for x86 system ACPI / table: remove duplicate NULL check for the handler of acpi_table_parse() ACPI / EC: Update revision due to raw handler mode. ACPI / EC: Reduce ec_poll() by referencing the last register access timestamp. ACPI / EC: Fix several GPE handling issues by deploying ACPI_GPE_DISPATCH_RAW_HANDLER mode. ACPICA: Events: Enable APIs to allow interrupt/polling adaptive request based GPE handling model ...
2015-02-11 07:09:41 +08:00
struct resource_entry *win;
err = of_pci_get_host_bridge_resources(np, 0, 0xff, res, &iobase);
if (err)
return err;
err = devm_request_pci_bus_resources(dev, res);
if (err)
goto out_release_res;
resource_list_for_each_entry(win, res) {
struct resource *res = win->res;
switch (resource_type(res)) {
case IORESOURCE_IO:
err = pci_remap_iospace(res, iobase);
if (err)
dev_warn(dev, "error %d: failed to map resource %pR\n",
err, res);
break;
case IORESOURCE_MEM:
res_valid |= !(res->flags & IORESOURCE_PREFETCH);
writel(res->start >> 28, PCI_IMAP(mem));
writel(PHYS_OFFSET >> 28, PCI_SMAP(mem));
mem++;
break;
}
}
if (res_valid)
return 0;
dev_err(dev, "non-prefetchable memory resource required\n");
err = -EINVAL;
out_release_res:
pci_free_resource_list(res);
return err;
}
static int versatile_pci_probe(struct platform_device *pdev)
{
struct resource *res;
int ret, i, myslot = -1;
u32 val;
void __iomem *local_pci_cfg_base;
struct pci_bus *bus;
LIST_HEAD(pci_res);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
versatile_pci_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(versatile_pci_base))
return PTR_ERR(versatile_pci_base);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
versatile_cfg_base[0] = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(versatile_cfg_base[0]))
return PTR_ERR(versatile_cfg_base[0]);
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
versatile_cfg_base[1] = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(versatile_cfg_base[1]))
return PTR_ERR(versatile_cfg_base[1]);
ret = versatile_pci_parse_request_of_pci_ranges(&pdev->dev, &pci_res);
if (ret)
return ret;
/*
* 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) + PCI_VENDOR_ID) == VP_PCI_DEVICE_ID) &&
(readl(versatile_cfg_base[0] + (i << 11) + PCI_CLASS_REVISION) == VP_PCI_CLASS_ID)) {
myslot = i;
break;
}
}
if (myslot == -1) {
dev_err(&pdev->dev, "Cannot find PCI core!\n");
return -EIO;
}
/*
* 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 + PCI_COMMAND);
val |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE;
writel(val, local_pci_cfg_base + PCI_COMMAND);
/*
* 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_add_flags(PCI_ENABLE_PROC_DOMAINS);
pci_add_flags(PCI_REASSIGN_ALL_BUS | PCI_REASSIGN_ALL_RSRC);
bus = pci_scan_root_bus(&pdev->dev, 0, &pci_versatile_ops, NULL, &pci_res);
if (!bus)
return -ENOMEM;
pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
pci_assign_unassigned_bus_resources(bus);
PCI: Assign resources before drivers claim devices (pci_scan_root_bus()) Previously, pci_scan_root_bus() created a root PCI bus, enumerated the devices on it, and called pci_bus_add_devices(), which made the devices available for drivers to claim them. Most callers assigned resources to devices after pci_scan_root_bus() returns, which may be after drivers have claimed the devices. This is incorrect; the PCI core should not change device resources while a driver is managing the device. Remove pci_bus_add_devices() from pci_scan_root_bus() and do it after any resource assignment in the callers. Note that ARM's pci_common_init_dev() already called pci_bus_add_devices() after pci_scan_root_bus(), so we only need to remove the first call: pci_common_init_dev pcibios_init_hw pci_scan_root_bus pci_bus_add_devices # first call pci_bus_assign_resources pci_bus_add_devices # second call [bhelgaas: changelog, drop "root_bus" var in alpha common_init_pci(), return failure earlier in mn10300, add "return" in x86 pcibios_scan_root(), return early if xtensa platform_pcibios_fixup() fails] Signed-off-by: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: Richard Henderson <rth@twiddle.net> CC: Ivan Kokshaysky <ink@jurassic.park.msu.ru> CC: Matt Turner <mattst88@gmail.com> CC: David Howells <dhowells@redhat.com> CC: Tony Luck <tony.luck@intel.com> CC: Michal Simek <monstr@monstr.eu> CC: Ralf Baechle <ralf@linux-mips.org> CC: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> CC: Sebastian Ott <sebott@linux.vnet.ibm.com> CC: "David S. Miller" <davem@davemloft.net> CC: Chris Metcalf <cmetcalf@ezchip.com> CC: Chris Zankel <chris@zankel.net> CC: Max Filippov <jcmvbkbc@gmail.com> CC: Thomas Gleixner <tglx@linutronix.de>
2015-03-16 11:18:56 +08:00
pci_bus_add_devices(bus);
return 0;
}
static const struct of_device_id versatile_pci_of_match[] = {
{ .compatible = "arm,versatile-pci", },
{ },
};
MODULE_DEVICE_TABLE(of, versatile_pci_of_match);
static struct platform_driver versatile_pci_driver = {
.driver = {
.name = "versatile-pci",
.of_match_table = versatile_pci_of_match,
},
.probe = versatile_pci_probe,
};
module_platform_driver(versatile_pci_driver);
MODULE_DESCRIPTION("Versatile PCI driver");
MODULE_LICENSE("GPL v2");