[RFC PATCH 09/20] powerpc/io: Remove PPC_IO_WORKAROUNDS

[Michael Ellerman <mpe@ellerman.id.au>]

The Cell blade support was the last user of PPC_IO_WORKAROUNDS, so they
can now be removed.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
 arch/powerpc/include/asm/io-workarounds.h |  55 ------
 arch/powerpc/kernel/Makefile              |   2 -
 arch/powerpc/kernel/io-workarounds.c      | 197 ----------------------
 arch/powerpc/mm/ioremap.c                 |   9 -
 arch/powerpc/platforms/Kconfig            |   3 -
 5 files changed, 266 deletions(-)
 delete mode 100644 arch/powerpc/include/asm/io-workarounds.h
 delete mode 100644 arch/powerpc/kernel/io-workarounds.c

diff --git a/arch/powerpc/include/asm/io-workarounds.h b/arch/powerpc/include/asm/io-workarounds.h
deleted file mode 100644
index 3cce499fbe27..000000000000
--- a/arch/powerpc/include/asm/io-workarounds.h
+++ /dev/null
@@ -1,55 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * Support PCI IO workaround
- *
- * (C) Copyright 2007-2008 TOSHIBA CORPORATION
- */
-
-#ifndef _IO_WORKAROUNDS_H
-#define _IO_WORKAROUNDS_H
-
-#ifdef CONFIG_PPC_IO_WORKAROUNDS
-#include <linux/io.h>
-#include <asm/pci-bridge.h>
-
-/* Bus info */
-struct iowa_bus {
-	struct pci_controller *phb;
-	struct ppc_pci_io *ops;
-	void   *private;
-};
-
-void iowa_register_bus(struct pci_controller *, struct ppc_pci_io *,
-		       int (*)(struct iowa_bus *, void *), void *);
-struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR);
-struct iowa_bus *iowa_pio_find_bus(unsigned long);
-
-extern struct ppc_pci_io spiderpci_ops;
-extern int spiderpci_iowa_init(struct iowa_bus *, void *);
-
-#define SPIDER_PCI_REG_BASE		0xd000
-#define SPIDER_PCI_REG_SIZE		0x1000
-#define SPIDER_PCI_VCI_CNTL_STAT	0x0110
-#define SPIDER_PCI_DUMMY_READ		0x0810
-#define SPIDER_PCI_DUMMY_READ_BASE	0x0814
-
-#endif
-
-#if defined(CONFIG_PPC_IO_WORKAROUNDS) && defined(CONFIG_PPC_INDIRECT_MMIO)
-extern bool io_workaround_inited;
-
-static inline bool iowa_is_active(void)
-{
-	return unlikely(io_workaround_inited);
-}
-#else
-static inline bool iowa_is_active(void)
-{
-	return false;
-}
-#endif
-
-void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size,
-			   pgprot_t prot, void *caller);
-
-#endif /* _IO_WORKAROUNDS_H */
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index d6febd297e72..6ac621155ec3 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -152,8 +152,6 @@ obj-$(CONFIG_PCI_MSI)		+= msi.o
 obj-$(CONFIG_AUDIT)		+= audit.o
 obj64-$(CONFIG_AUDIT)		+= compat_audit.o
 
-obj-$(CONFIG_PPC_IO_WORKAROUNDS)	+= io-workarounds.o
-
 obj-y				+= trace/
 
 ifneq ($(CONFIG_PPC_INDIRECT_PIO),y)
diff --git a/arch/powerpc/kernel/io-workarounds.c b/arch/powerpc/kernel/io-workarounds.c
deleted file mode 100644
index c877f074d174..000000000000
--- a/arch/powerpc/kernel/io-workarounds.c
+++ /dev/null
@@ -1,197 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Support PCI IO workaround
- *
- *  Copyright (C) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org>
- *		       IBM, Corp.
- *  (C) Copyright 2007-2008 TOSHIBA CORPORATION
- */
-#undef DEBUG
-
-#include <linux/kernel.h>
-#include <linux/sched/mm.h>	/* for init_mm */
-#include <linux/pgtable.h>
-
-#include <asm/io.h>
-#include <asm/machdep.h>
-#include <asm/ppc-pci.h>
-#include <asm/io-workarounds.h>
-#include <asm/pte-walk.h>
-
-
-#define IOWA_MAX_BUS	8
-
-static struct iowa_bus iowa_busses[IOWA_MAX_BUS];
-static unsigned int iowa_bus_count;
-
-static struct iowa_bus *iowa_pci_find(unsigned long vaddr, unsigned long paddr)
-{
-	int i, j;
-	struct resource *res;
-	unsigned long vstart, vend;
-
-	for (i = 0; i < iowa_bus_count; i++) {
-		struct iowa_bus *bus = &iowa_busses[i];
-		struct pci_controller *phb = bus->phb;
-
-		if (vaddr) {
-			vstart = (unsigned long)phb->io_base_virt;
-			vend = vstart + phb->pci_io_size - 1;
-			if ((vaddr >= vstart) && (vaddr <= vend))
-				return bus;
-		}
-
-		if (paddr)
-			for (j = 0; j < 3; j++) {
-				res = &phb->mem_resources[j];
-				if (paddr >= res->start && paddr <= res->end)
-					return bus;
-			}
-	}
-
-	return NULL;
-}
-
-#ifdef CONFIG_PPC_INDIRECT_MMIO
-struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr)
-{
-	struct iowa_bus *bus;
-	int token;
-
-	token = PCI_GET_ADDR_TOKEN(addr);
-
-	if (token && token <= iowa_bus_count)
-		bus = &iowa_busses[token - 1];
-	else {
-		unsigned long vaddr, paddr;
-
-		vaddr = (unsigned long)PCI_FIX_ADDR(addr);
-		if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END)
-			return NULL;
-
-		paddr = ppc_find_vmap_phys(vaddr);
-
-		bus = iowa_pci_find(vaddr, paddr);
-
-		if (bus == NULL)
-			return NULL;
-	}
-
-	return bus;
-}
-#else /* CONFIG_PPC_INDIRECT_MMIO */
-struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr)
-{
-	return NULL;
-}
-#endif /* !CONFIG_PPC_INDIRECT_MMIO */
-
-#ifdef CONFIG_PPC_INDIRECT_PIO
-struct iowa_bus *iowa_pio_find_bus(unsigned long port)
-{
-	unsigned long vaddr = (unsigned long)pci_io_base + port;
-	return iowa_pci_find(vaddr, 0);
-}
-#else
-struct iowa_bus *iowa_pio_find_bus(unsigned long port)
-{
-	return NULL;
-}
-#endif
-
-#define DEF_PCI_AC_RET(name, ret, at, al, space, aa)		\
-static ret iowa_##name at					\
-{								\
-	struct iowa_bus *bus;					\
-	bus = iowa_##space##_find_bus(aa);			\
-	if (bus && bus->ops && bus->ops->name)			\
-		return bus->ops->name al;			\
-	return __do_##name al;					\
-}
-
-#define DEF_PCI_AC_NORET(name, at, al, space, aa)		\
-static void iowa_##name at					\
-{								\
-	struct iowa_bus *bus;					\
-	bus = iowa_##space##_find_bus(aa);			\
-	if (bus && bus->ops && bus->ops->name) {		\
-		bus->ops->name al;				\
-		return;						\
-	}							\
-	__do_##name al;						\
-}
-
-#include <asm/io-defs.h>
-
-#undef DEF_PCI_AC_RET
-#undef DEF_PCI_AC_NORET
-
-static const struct ppc_pci_io iowa_pci_io = {
-
-#define DEF_PCI_AC_RET(name, ret, at, al, space, aa)	.name = iowa_##name,
-#define DEF_PCI_AC_NORET(name, at, al, space, aa)	.name = iowa_##name,
-
-#include <asm/io-defs.h>
-
-#undef DEF_PCI_AC_RET
-#undef DEF_PCI_AC_NORET
-
-};
-
-#ifdef CONFIG_PPC_INDIRECT_MMIO
-void __iomem *iowa_ioremap(phys_addr_t addr, unsigned long size,
-			   pgprot_t prot, void *caller)
-{
-	struct iowa_bus *bus;
-	void __iomem *res = __ioremap_caller(addr, size, prot, caller);
-	int busno;
-
-	bus = iowa_pci_find(0, (unsigned long)addr);
-	if (bus != NULL) {
-		busno = bus - iowa_busses;
-		PCI_SET_ADDR_TOKEN(res, busno + 1);
-	}
-	return res;
-}
-#endif /* !CONFIG_PPC_INDIRECT_MMIO */
-
-bool io_workaround_inited;
-
-/* Enable IO workaround */
-static void io_workaround_init(void)
-{
-	if (io_workaround_inited)
-		return;
-	ppc_pci_io = iowa_pci_io;
-	io_workaround_inited = true;
-}
-
-/* Register new bus to support workaround */
-void iowa_register_bus(struct pci_controller *phb, struct ppc_pci_io *ops,
-		       int (*initfunc)(struct iowa_bus *, void *), void *data)
-{
-	struct iowa_bus *bus;
-	struct device_node *np = phb->dn;
-
-	io_workaround_init();
-
-	if (iowa_bus_count >= IOWA_MAX_BUS) {
-		pr_err("IOWA:Too many pci bridges, "
-		       "workarounds disabled for %pOF\n", np);
-		return;
-	}
-
-	bus = &iowa_busses[iowa_bus_count];
-	bus->phb = phb;
-	bus->ops = ops;
-	bus->private = data;
-
-	if (initfunc)
-		if ((*initfunc)(bus, data))
-			return;
-
-	iowa_bus_count++;
-
-	pr_debug("IOWA:[%d]Add bus, %pOF.\n", iowa_bus_count-1, np);
-}
-
diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c
index 7b0afcabd89f..70b08bf3dd1f 100644
--- a/arch/powerpc/mm/ioremap.c
+++ b/arch/powerpc/mm/ioremap.c
@@ -4,7 +4,6 @@
 #include <linux/slab.h>
 #include <linux/mmzone.h>
 #include <linux/vmalloc.h>
-#include <asm/io-workarounds.h>
 
 unsigned long ioremap_bot;
 EXPORT_SYMBOL(ioremap_bot);
@@ -14,8 +13,6 @@ void __iomem *ioremap(phys_addr_t addr, unsigned long size)
 	pgprot_t prot = pgprot_noncached(PAGE_KERNEL);
 	void *caller = __builtin_return_address(0);
 
-	if (iowa_is_active())
-		return iowa_ioremap(addr, size, prot, caller);
 	return __ioremap_caller(addr, size, prot, caller);
 }
 EXPORT_SYMBOL(ioremap);
@@ -25,8 +22,6 @@ void __iomem *ioremap_wc(phys_addr_t addr, unsigned long size)
 	pgprot_t prot = pgprot_noncached_wc(PAGE_KERNEL);
 	void *caller = __builtin_return_address(0);
 
-	if (iowa_is_active())
-		return iowa_ioremap(addr, size, prot, caller);
 	return __ioremap_caller(addr, size, prot, caller);
 }
 EXPORT_SYMBOL(ioremap_wc);
@@ -36,8 +31,6 @@ void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size)
 	pgprot_t prot = pgprot_cached(PAGE_KERNEL);
 	void *caller = __builtin_return_address(0);
 
-	if (iowa_is_active())
-		return iowa_ioremap(addr, size, prot, caller);
 	return __ioremap_caller(addr, size, prot, caller);
 }
 
@@ -50,8 +43,6 @@ void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long flags)
 	if (pte_write(pte))
 		pte = pte_mkdirty(pte);
 
-	if (iowa_is_active())
-		return iowa_ioremap(addr, size, pte_pgprot(pte), caller);
 	return __ioremap_caller(addr, size, pte_pgprot(pte), caller);
 }
 EXPORT_SYMBOL(ioremap_prot);
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index a454149ae02f..d11ade7cf7b3 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -189,9 +189,6 @@ config PPC_INDIRECT_PIO
 config PPC_INDIRECT_MMIO
 	bool
 
-config PPC_IO_WORKAROUNDS
-	bool
-
 source "drivers/cpufreq/Kconfig"
 
 menu "CPUIdle driver"
-- 
2.47.0