Commit 4cfa8e75 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: make pmb iomapping configurable. 



This plugs in an early_param for permitting transparent PMB-backed
ioremapping to be enabled/disabled. For the time being, we use a
default-disabled policy.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 90e7d649

arch/sh/mm/pmb.c

+17 −0
Original line number Diff line number Diff line
@@ -68,6 +68,8 @@ static DEFINE_RWLOCK(pmb_rwlock); 
static struct pmb_entry pmb_entry_list[NR_PMB_ENTRIES];

static DECLARE_BITMAP(pmb_map, NR_PMB_ENTRIES);



static unsigned int pmb_iomapping_enabled;



static __always_inline unsigned long mk_pmb_entry(unsigned int entry)

{

	return (entry & PMB_E_MASK) << PMB_E_SHIFT;
@@ -284,6 +286,9 @@ void __iomem *pmb_remap_caller(phys_addr_t phys, unsigned long size, 
	unsigned long aligned;

	struct vm_struct *area;



	if (!pmb_iomapping_enabled)

		return NULL;



	/*

	 * Small mappings need to go through the TLB.

	 */
@@ -684,6 +689,18 @@ static void __init pmb_resize(void) 
}

#endif



static int __init early_pmb(char *p)

{

	if (!p)

		return 0;



	if (strstr(p, "iomap"))

		pmb_iomapping_enabled = 1;



	return 0;

}

early_param("pmb", early_pmb);



void __init pmb_init(void)

{

	/* Synchronize software state */