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Commit 99f95f11 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: pci: Rework fixed region checks in ioremap(). 



Not all PCI channels have non-translatable memory windows, this is a
special property of the on-chip PCIC with its 0xfd00... mapping, handle
this explicitly.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 0bb34a6b

arch/sh/include/asm/pci.h

+11 −18
Original line number Diff line number Diff line
@@ -90,7 +90,6 @@ static inline void pcibios_penalize_isa_irq(int irq, int active) 
#define pci_unmap_len_set(PTR, LEN_NAME, VAL)	do { } while (0)

#endif



#ifdef CONFIG_PCI

static inline void pci_dma_burst_advice(struct pci_dev *pdev,

					enum pci_dma_burst_strategy *strat,

					unsigned long *strategy_parameter)
@@ -99,24 +98,18 @@ static inline void pci_dma_burst_advice(struct pci_dev *pdev, 
	*strategy_parameter = ~0UL;

}



static inline int __is_pci_memory(unsigned long phys_addr, unsigned long size)

{

	struct pci_channel *p;

	struct resource *res;



	for (p = board_pci_channels; p->init; p++) {

		res = p->mem_resource;

		if (p->enabled && (phys_addr >= res->start) &&

		    (phys_addr + size) <= (res->end + 1))

			return 1;

	}

	return 0;

}

#ifdef CONFIG_SUPERH32

/*

 * If we're on an SH7751 or SH7780 PCI controller, PCI memory is mapped

 * at the end of the address space in a special non-translatable area.

 */

#define PCI_MEM_FIXED_START	0xfd000000

#define PCI_MEM_FIXED_END	(PCI_MEM_FIXED_START + 0x01000000)



#define is_pci_memory_fixed_range(s, e)	\

	((s) >= PCI_MEM_FIXED_START && (e) < PCI_MEM_FIXED_END)

#else

static inline int __is_pci_memory(unsigned long phys_addr, unsigned long size)

{

	return 0;

}

#define is_pci_memory_fixed_range(s, e)	(0)

#endif



/* Board-specific fixup routines. */

arch/sh/mm/ioremap_32.c

+7 −7
Original line number Diff line number Diff line
@@ -46,17 +46,15 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size, 
		return NULL;



	/*

	 * If we're on an SH7751 or SH7780 PCI controller, PCI memory is

	 * mapped at the end of the address space (typically 0xfd000000)

	 * in a non-translatable area, so mapping through page tables for

	 * this area is not only pointless, but also fundamentally

	 * broken. Just return the physical address instead.

	 * If we're in the fixed PCI memory range, mapping through page

	 * tables is not only pointless, but also fundamentally broken.

	 * Just return the physical address instead.

	 *

	 * For boards that map a small PCI memory aperture somewhere in

	 * P1/P2 space, ioremap() will already do the right thing,

	 * and we'll never get this far.

	 */

	if (__is_pci_memory(phys_addr, size))

	if (is_pci_memory_fixed_range(phys_addr, size))

		return (void __iomem *)phys_addr;



#if !defined(CONFIG_PMB_FIXED)
@@ -121,7 +119,9 @@ void __iounmap(void __iomem *addr) 
	unsigned long seg = PXSEG(vaddr);

	struct vm_struct *p;



	if (seg < P3SEG || vaddr >= P3_ADDR_MAX || __is_pci_memory(vaddr, 0))

	if (seg < P3SEG || vaddr >= P3_ADDR_MAX)

		return;

	if (is_pci_memory_fixed_range(vaddr, 0))

		return;



#ifdef CONFIG_PMB