PCI: Move pci_iomap.c to drivers/pci/

The entirety of pci_iomap.c is guarded by an #ifdef CONFIG_PCI. It,
consequently, does not belong to lib/ because it is not generic
infrastructure.

Move pci_iomap.c to drivers/pci/ and implement the necessary changes to
Makefiles and Kconfigs.

Update MAINTAINERS file.

Update Documentation.

Link: https://lore.kernel.org/r/20240131090023.12331-3-pstanner@redhat.com
[bhelgaas: squash in https://lore.kernel.org/r/20240212150934.24559-1-pstanner@redhat.com]
Suggested-by: Danilo Krummrich <dakr@redhat.com>
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

3 files changed, 0 insertions, 184 deletions

diff --git a/lib/Kconfig b/lib/Kconfig
index 5ddda7c2ed9b33..4557bb8a525651 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -70,9 +70,6 @@ source "lib/math/Kconfig"
 config NO_GENERIC_PCI_IOPORT_MAP
 	bool
 
-config GENERIC_PCI_IOMAP
-	bool
-
 config GENERIC_IOMAP
 	bool
 	select GENERIC_PCI_IOMAP
diff --git a/lib/Makefile b/lib/Makefile
index 6b09731d8e6195..0800289ec6c52e 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -153,7 +153,6 @@ CFLAGS_debug_info.o += $(call cc-option, -femit-struct-debug-detailed=any)
 obj-y += math/ crypto/
 
 obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
-obj-$(CONFIG_GENERIC_PCI_IOMAP) += pci_iomap.o
 obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o
 obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o
 obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o
diff --git a/lib/pci_iomap.c b/lib/pci_iomap.c
deleted file mode 100644
index 2829ddb0e316b4..00000000000000
--- a/lib/pci_iomap.c
+++ /dev/null
@@ -1,180 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Implement the default iomap interfaces
- *
- * (C) Copyright 2004 Linus Torvalds
- */
-#include <linux/pci.h>
-#include <linux/io.h>
-
-#include <linux/export.h>
-
-#ifdef CONFIG_PCI
-/**
- * pci_iomap_range - create a virtual mapping cookie for a PCI BAR
- * @dev: PCI device that owns the BAR
- * @bar: BAR number
- * @offset: map memory at the given offset in BAR
- * @maxlen: max length of the memory to map
- *
- * Using this function you will get a __iomem address to your device BAR.
- * You can access it using ioread*() and iowrite*(). These functions hide
- * the details if this is a MMIO or PIO address space and will just do what
- * you expect from them in the correct way.
- *
- * @maxlen specifies the maximum length to map. If you want to get access to
- * the complete BAR from offset to the end, pass %0 here.
- * */
-void __iomem *pci_iomap_range(struct pci_dev *dev,
-			      int bar,
-			      unsigned long offset,
-			      unsigned long maxlen)
-{
-	resource_size_t start = pci_resource_start(dev, bar);
-	resource_size_t len = pci_resource_len(dev, bar);
-	unsigned long flags = pci_resource_flags(dev, bar);
-
-	if (len <= offset || !start)
-		return NULL;
-	len -= offset;
-	start += offset;
-	if (maxlen && len > maxlen)
-		len = maxlen;
-	if (flags & IORESOURCE_IO)
-		return __pci_ioport_map(dev, start, len);
-	if (flags & IORESOURCE_MEM)
-		return ioremap(start, len);
-	/* What? */
-	return NULL;
-}
-EXPORT_SYMBOL(pci_iomap_range);
-
-/**
- * pci_iomap_wc_range - create a virtual WC mapping cookie for a PCI BAR
- * @dev: PCI device that owns the BAR
- * @bar: BAR number
- * @offset: map memory at the given offset in BAR
- * @maxlen: max length of the memory to map
- *
- * Using this function you will get a __iomem address to your device BAR.
- * You can access it using ioread*() and iowrite*(). These functions hide
- * the details if this is a MMIO or PIO address space and will just do what
- * you expect from them in the correct way. When possible write combining
- * is used.
- *
- * @maxlen specifies the maximum length to map. If you want to get access to
- * the complete BAR from offset to the end, pass %0 here.
- * */
-void __iomem *pci_iomap_wc_range(struct pci_dev *dev,
-				 int bar,
-				 unsigned long offset,
-				 unsigned long maxlen)
-{
-	resource_size_t start = pci_resource_start(dev, bar);
-	resource_size_t len = pci_resource_len(dev, bar);
-	unsigned long flags = pci_resource_flags(dev, bar);
-
-
-	if (flags & IORESOURCE_IO)
-		return NULL;
-
-	if (len <= offset || !start)
-		return NULL;
-
-	len -= offset;
-	start += offset;
-	if (maxlen && len > maxlen)
-		len = maxlen;
-
-	if (flags & IORESOURCE_MEM)
-		return ioremap_wc(start, len);
-
-	/* What? */
-	return NULL;
-}
-EXPORT_SYMBOL_GPL(pci_iomap_wc_range);
-
-/**
- * pci_iomap - create a virtual mapping cookie for a PCI BAR
- * @dev: PCI device that owns the BAR
- * @bar: BAR number
- * @maxlen: length of the memory to map
- *
- * Using this function you will get a __iomem address to your device BAR.
- * You can access it using ioread*() and iowrite*(). These functions hide
- * the details if this is a MMIO or PIO address space and will just do what
- * you expect from them in the correct way.
- *
- * @maxlen specifies the maximum length to map. If you want to get access to
- * the complete BAR without checking for its length first, pass %0 here.
- * */
-void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
-{
-	return pci_iomap_range(dev, bar, 0, maxlen);
-}
-EXPORT_SYMBOL(pci_iomap);
-
-/**
- * pci_iomap_wc - create a virtual WC mapping cookie for a PCI BAR
- * @dev: PCI device that owns the BAR
- * @bar: BAR number
- * @maxlen: length of the memory to map
- *
- * Using this function you will get a __iomem address to your device BAR.
- * You can access it using ioread*() and iowrite*(). These functions hide
- * the details if this is a MMIO or PIO address space and will just do what
- * you expect from them in the correct way. When possible write combining
- * is used.
- *
- * @maxlen specifies the maximum length to map. If you want to get access to
- * the complete BAR without checking for its length first, pass %0 here.
- * */
-void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
-{
-	return pci_iomap_wc_range(dev, bar, 0, maxlen);
-}
-EXPORT_SYMBOL_GPL(pci_iomap_wc);
-
-/*
- * pci_iounmap() somewhat illogically comes from lib/iomap.c for the
- * CONFIG_GENERIC_IOMAP case, because that's the code that knows about
- * the different IOMAP ranges.
- *
- * But if the architecture does not use the generic iomap code, and if
- * it has _not_ defined it's own private pci_iounmap function, we define
- * it here.
- *
- * NOTE! This default implementation assumes that if the architecture
- * support ioport mapping (HAS_IOPORT_MAP), the ioport mapping will
- * be fixed to the range [ PCI_IOBASE, PCI_IOBASE+IO_SPACE_LIMIT [,
- * and does not need unmapping with 'ioport_unmap()'.
- *
- * If you have different rules for your architecture, you need to
- * implement your own pci_iounmap() that knows the rules for where
- * and how IO vs MEM get mapped.
- *
- * This code is odd, and the ARCH_HAS/ARCH_WANTS #define logic comes
- * from legacy <asm-generic/io.h> header file behavior. In particular,
- * it would seem to make sense to do the iounmap(p) for the non-IO-space
- * case here regardless, but that's not what the old header file code
- * did. Probably incorrectly, but this is meant to be bug-for-bug
- * compatible.
- */
-#if defined(ARCH_WANTS_GENERIC_PCI_IOUNMAP)
-
-void pci_iounmap(struct pci_dev *dev, void __iomem *p)
-{
-#ifdef ARCH_HAS_GENERIC_IOPORT_MAP
-	uintptr_t start = (uintptr_t) PCI_IOBASE;
-	uintptr_t addr = (uintptr_t) p;
-
-	if (addr >= start && addr < start + IO_SPACE_LIMIT)
-		return;
-#endif
-	iounmap(p);
-}
-EXPORT_SYMBOL(pci_iounmap);
-
-#endif /* ARCH_WANTS_GENERIC_PCI_IOUNMAP */
-
-#endif /* CONFIG_PCI */