linux/drivers/pci/controller/pci-versatile.c
Nick Alcock f98954b293 PCI: Remove MODULE_LICENSE so boolean drivers don't look like modules
Since 8b41fc4454 ("kbuild: create modules.builtin without
Makefile.modbuiltin or tristate.conf"), MODULE_LICENSE declarations are
used to identify modules. As a consequence, MODULE_LICENSE in non-modules
causes modprobe to misidentify the object file as a module when it is not,
and modprobe might succeed rather than failing with a suitable error
message.

For tristate modules that can be either built-in or loaded at runtime,
modprobe succeeds in both cases:

  # modprobe ext4
  [exit status zero if CONFIG_EXT4_FS=y or =m]

For boolean modules like the Standard Hot Plug Controller driver (shpchp)
that cannot be loaded at runtime, modprobe should always fail like this:

  # modprobe shpchp
  modprobe: FATAL: Module shpchp not found in directory /lib/modules/...
  [exit status non-zero regardless of CONFIG_HOTPLUG_PCI_SHPC]

but prior to this commit, shpchp_core.c contained MODULE_LICENSE, so
"modprobe shpchp" silently succeeded when it should have failed.

Remove MODULE_LICENSE in files that cannot be built as modules.

[bhelgaas: commit log, squash]
Suggested-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20230216152410.4312-1-nick.alcock@oracle.com/
Signed-off-by: Nick Alcock <nick.alcock@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Hitomi Hasegawa <hasegawa-hitomi@fujitsu.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Lorenzo Pieralisi <lpieralisi@kernel.org>
2023-02-17 08:47:58 -06:00

172 lines
4.8 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2004 Koninklijke Philips Electronics NV
*
* Conversion to platform driver and DT:
* Copyright 2014 Linaro Ltd.
*
* 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>
#include "../pci.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 slot;
while (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_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct resource *res;
struct resource_entry *entry;
int i, myslot = -1, mem = 1;
u32 val;
void __iomem *local_pci_cfg_base;
struct pci_host_bridge *bridge;
bridge = devm_pci_alloc_host_bridge(dev, 0);
if (!bridge)
return -ENOMEM;
versatile_pci_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(versatile_pci_base))
return PTR_ERR(versatile_pci_base);
versatile_cfg_base[0] = devm_platform_ioremap_resource(pdev, 1);
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_pci_remap_cfg_resource(dev, res);
if (IS_ERR(versatile_cfg_base[1]))
return PTR_ERR(versatile_cfg_base[1]);
resource_list_for_each_entry(entry, &bridge->windows) {
if (resource_type(entry->res) == IORESOURCE_MEM) {
writel(entry->res->start >> 28, PCI_IMAP(mem));
writel(__pa(PAGE_OFFSET) >> 28, PCI_SMAP(mem));
mem++;
}
}
/*
* 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(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(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(__pa(PAGE_OFFSET), local_pci_cfg_base + PCI_BASE_ADDRESS_0);
writel(__pa(PAGE_OFFSET), local_pci_cfg_base + PCI_BASE_ADDRESS_1);
writel(__pa(PAGE_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_REASSIGN_ALL_BUS);
bridge->ops = &pci_versatile_ops;
return pci_host_probe(bridge);
}
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,
.suppress_bind_attrs = true,
},
.probe = versatile_pci_probe,
};
module_platform_driver(versatile_pci_driver);
MODULE_DESCRIPTION("Versatile PCI driver");