ARM: ixp4xx: Delete old PCI driver

We are just using the new PCI driver in the proper PCI host
drivers folder: drivers/pci/controller/pci-ixp4xx.c.

The new driver does not support indirect PCI but it has
turned out noone is using this. If the feature is desired
we have ways to implement it, suggested by John Linville.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20220211223238.648934-4-linus.walleij@linaro.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/Kconfig

@@ -391,8 +391,6 @@ config ARCH_IXP4XX
 	select HAVE_PCI
 	select IXP4XX_IRQ
 	select IXP4XX_TIMER
-	# With the new PCI driver this is not needed
-	select NEED_MACH_IO_H if IXP4XX_PCI_LEGACY
 	select USB_EHCI_BIG_ENDIAN_DESC
 	select USB_EHCI_BIG_ENDIAN_MMIO
 	help

arch/arm/mach-ixp4xx/Kconfig

@@ -24,41 +24,6 @@ config ARCH_PRPMC1100
 	  PrPCM1100 Processor Mezanine Module. For more information on
 	  this platform, see <file:Documentation/arm/ixp4xx.rst>.
 
-comment "IXP4xx Options"
-
-config IXP4XX_PCI_LEGACY
-	bool "IXP4xx legacy PCI driver support"
-	depends on PCI
-	help
-	  Selects legacy PCI driver.
-	  Not recommended for new development.
-
-config IXP4XX_INDIRECT_PCI
-	bool "Use indirect PCI memory access"
-	depends on IXP4XX_PCI_LEGACY
-	help
-          IXP4xx provides two methods of accessing PCI memory space:
-
-          1) A direct mapped window from 0x48000000 to 0x4BFFFFFF (64MB).
-             To access PCI via this space, we simply ioremap() the BAR
-             into the kernel and we can use the standard read[bwl]/write[bwl]
-             macros. This is the preferred method due to speed but it
-             limits the system to just 64MB of PCI memory. This can be
-             problematic if using video cards and other memory-heavy devices.
-
-	  2) If > 64MB of memory space is required, the IXP4xx can be
-	     configured to use indirect registers to access the whole PCI
-	     memory space. This currently allows for up to 1 GB (0x10000000
-	     to 0x4FFFFFFF) of memory on the bus. The disadvantage of this
-	     is that every PCI access requires three local register accesses
-	     plus a spinlock, but in some cases the performance hit is
-	     acceptable. In addition, you cannot mmap() PCI devices in this
-	     case due to the indirect nature of the PCI window.
-
-	  By default, the direct method is used. Choose this option if you
-	  need to use the indirect method instead. If you don't know
-	  what you need, leave this option unselected.
-
 endmenu
 
 endif

arch/arm/mach-ixp4xx/Makefile

 # SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for the linux kernel.
-#
-
-obj-pci-y	:=
-obj-pci-n	:=
-
-# Device tree platform
-obj-pci-$(CONFIG_MACH_IXP4XX_OF)	+= ixp4xx-of.o
-
-obj-y	+= common.o
-
-obj-$(CONFIG_PCI)		+= $(obj-pci-$(CONFIG_PCI)) common-pci.o
+obj-y	+= ixp4xx-of.o common.o

arch/arm/mach-ixp4xx/common.c

@@ -411,38 +411,10 @@ int dma_set_coherent_mask(struct device *dev, u64 mask)
 }
 EXPORT_SYMBOL(dma_set_coherent_mask);
 
-#ifdef CONFIG_IXP4XX_INDIRECT_PCI
-/*
- * In the case of using indirect PCI, we simply return the actual PCI
- * address and our read/write implementation use that to drive the
- * access registers. If something outside of PCI is ioremap'd, we
- * fallback to the default.
- */
-
-static void __iomem *ixp4xx_ioremap_caller(phys_addr_t addr, size_t size,
-					   unsigned int mtype, void *caller)
-{
-	if (!is_pci_memory(addr))
-		return __arm_ioremap_caller(addr, size, mtype, caller);
-
-	return (void __iomem *)addr;
-}
-
-static void ixp4xx_iounmap(volatile void __iomem *addr)
-{
-	if (!is_pci_memory((__force u32)addr))
-		__iounmap(addr);
-}
-#endif
-
 void __init ixp4xx_init_early(void)
 {
 	platform_notify = ixp4xx_platform_notify;
 #ifdef CONFIG_PCI
 	platform_notify_remove = ixp4xx_platform_notify_remove;
 #endif
-#ifdef CONFIG_IXP4XX_INDIRECT_PCI
-	arch_ioremap_caller = ixp4xx_ioremap_caller;
-	arch_iounmap = ixp4xx_iounmap;
-#endif
 }

arch/arm/mach-ixp4xx/include/mach/hardware.h

@@ -13,12 +13,6 @@
 #ifndef __ASM_ARCH_HARDWARE_H__
 #define __ASM_ARCH_HARDWARE_H__
 
-#ifdef CONFIG_IXP4XX_INDIRECT_PCI
-#define PCIBIOS_MAX_MEM		0x4FFFFFFF
-#else
-#define PCIBIOS_MAX_MEM		0x4BFFFFFF
-#endif
-
 /* Register locations and bits */
 #include "ixp4xx-regs.h"
 

arch/arm/mach-ixp4xx/include/mach/platform.h

@@ -93,10 +93,6 @@ extern void ixp4xx_init_irq(void);
 extern void ixp4xx_sys_init(void);
 extern void ixp4xx_timer_init(void);
 extern void ixp4xx_restart(enum reboot_mode, const char *);
-extern void ixp4xx_pci_preinit(void);
-struct pci_sys_data;
-extern int ixp4xx_setup(int nr, struct pci_sys_data *sys);
-extern struct pci_ops ixp4xx_ops;
 
 #endif // __ASSEMBLY__