aboutsummaryrefslogtreecommitdiff
path: root/arch/sh
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/boot/compressed/misc.c2
-rw-r--r--arch/sh/include/asm/io.h22
-rw-r--r--arch/sh/include/asm/mmu.h40
-rw-r--r--arch/sh/include/asm/page.h17
-rw-r--r--arch/sh/include/asm/ptrace.h11
-rw-r--r--arch/sh/include/asm/uncached.h18
-rw-r--r--arch/sh/include/cpu-sh4/cpu/sq.h3
-rw-r--r--arch/sh/kernel/cpu/init.c21
-rw-r--r--arch/sh/kernel/cpu/sh4/sq.c13
-rw-r--r--arch/sh/kernel/head_32.S52
-rw-r--r--arch/sh/kernel/setup.c2
-rw-r--r--arch/sh/kernel/traps_32.c7
-rw-r--r--arch/sh/kernel/vmlinux.lds.S7
-rw-r--r--arch/sh/mm/Kconfig10
-rw-r--r--arch/sh/mm/Makefile1
-rw-r--r--arch/sh/mm/init.c20
-rw-r--r--arch/sh/mm/ioremap.c2
-rw-r--r--arch/sh/mm/pmb.c571
-rw-r--r--arch/sh/mm/uncached.c34
19 files changed, 571 insertions, 282 deletions
diff --git a/arch/sh/boot/compressed/misc.c b/arch/sh/boot/compressed/misc.c
index 9ba07927d16a..27140a6b365d 100644
--- a/arch/sh/boot/compressed/misc.c
+++ b/arch/sh/boot/compressed/misc.c
@@ -117,7 +117,7 @@ void decompress_kernel(void)
output_addr = (CONFIG_MEMORY_START + 0x2000);
#else
output_addr = __pa((unsigned long)&_text+PAGE_SIZE);
-#if defined(CONFIG_29BIT) || defined(CONFIG_PMB_LEGACY)
+#if defined(CONFIG_29BIT)
output_addr |= P2SEG;
#endif
#endif
diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index bd5fafa23eb4..7dab7b23a5ec 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -133,6 +133,28 @@ static inline void ctrl_delay(void)
__raw_readw(generic_io_base);
}
+#define __BUILD_UNCACHED_IO(bwlq, type) \
+static inline type read##bwlq##_uncached(unsigned long addr) \
+{ \
+ type ret; \
+ jump_to_uncached(); \
+ ret = __raw_read##bwlq(addr); \
+ back_to_cached(); \
+ return ret; \
+} \
+ \
+static inline void write##bwlq##_uncached(type v, unsigned long addr) \
+{ \
+ jump_to_uncached(); \
+ __raw_write##bwlq(v, addr); \
+ back_to_cached(); \
+}
+
+__BUILD_UNCACHED_IO(b, u8)
+__BUILD_UNCACHED_IO(w, u16)
+__BUILD_UNCACHED_IO(l, u32)
+__BUILD_UNCACHED_IO(q, u64)
+
#define __BUILD_MEMORY_STRING(bwlq, type) \
\
static inline void __raw_writes##bwlq(volatile void __iomem *mem, \
diff --git a/arch/sh/include/asm/mmu.h b/arch/sh/include/asm/mmu.h
index ca7d91e8aa72..15a05b615ba7 100644
--- a/arch/sh/include/asm/mmu.h
+++ b/arch/sh/include/asm/mmu.h
@@ -11,7 +11,9 @@
#define PMB_ADDR 0xf6100000
#define PMB_DATA 0xf7100000
-#define PMB_ENTRY_MAX 16
+
+#define NR_PMB_ENTRIES 16
+
#define PMB_E_MASK 0x0000000f
#define PMB_E_SHIFT 8
@@ -25,6 +27,7 @@
#define PMB_C 0x00000008
#define PMB_WT 0x00000001
#define PMB_UB 0x00000200
+#define PMB_CACHE_MASK (PMB_C | PMB_WT | PMB_UB)
#define PMB_V 0x00000100
#define PMB_NO_ENTRY (-1)
@@ -32,6 +35,7 @@
#ifndef __ASSEMBLY__
#include <linux/errno.h>
#include <linux/threads.h>
+#include <asm/page.h>
/* Default "unsigned long" context */
typedef unsigned long mm_context_id_t[NR_CPUS];
@@ -49,46 +53,22 @@ typedef struct {
#endif
} mm_context_t;
-struct pmb_entry;
-
-struct pmb_entry {
- unsigned long vpn;
- unsigned long ppn;
- unsigned long flags;
-
- /*
- * 0 .. NR_PMB_ENTRIES for specific entry selection, or
- * PMB_NO_ENTRY to search for a free one
- */
- int entry;
-
- struct pmb_entry *next;
- /* Adjacent entry link for contiguous multi-entry mappings */
- struct pmb_entry *link;
-};
-
#ifdef CONFIG_PMB
/* arch/sh/mm/pmb.c */
long pmb_remap(unsigned long virt, unsigned long phys,
- unsigned long size, unsigned long flags);
+ unsigned long size, pgprot_t prot);
void pmb_unmap(unsigned long addr);
-int pmb_init(void);
+void pmb_init(void);
bool __in_29bit_mode(void);
#else
static inline long pmb_remap(unsigned long virt, unsigned long phys,
- unsigned long size, unsigned long flags)
+ unsigned long size, pgprot_t prot)
{
return -EINVAL;
}
-static inline void pmb_unmap(unsigned long addr)
-{
-}
-
-static inline int pmb_init(void)
-{
- return -ENODEV;
-}
+#define pmb_unmap(addr) do { } while (0)
+#define pmb_init(addr) do { } while (0)
#ifdef CONFIG_29BIT
#define __in_29bit_mode() (1)
diff --git a/arch/sh/include/asm/page.h b/arch/sh/include/asm/page.h
index 61e58105adc3..d71feb359304 100644
--- a/arch/sh/include/asm/page.h
+++ b/arch/sh/include/asm/page.h
@@ -45,6 +45,7 @@
#endif
#ifndef __ASSEMBLY__
+#include <asm/uncached.h>
extern unsigned long shm_align_mask;
extern unsigned long max_low_pfn, min_low_pfn;
@@ -56,7 +57,6 @@ pages_do_alias(unsigned long addr1, unsigned long addr2)
return (addr1 ^ addr2) & shm_align_mask;
}
-
#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
extern void copy_page(void *to, void *from);
@@ -127,12 +127,7 @@ typedef struct page *pgtable_t;
* is not visible (it is part of the PMB mapping) and so needs to be
* added or subtracted as required.
*/
-#if defined(CONFIG_PMB_LEGACY)
-/* phys = virt - PAGE_OFFSET - (__MEMORY_START & 0xe0000000) */
-#define PMB_OFFSET (PAGE_OFFSET - PXSEG(__MEMORY_START))
-#define __pa(x) ((unsigned long)(x) - PMB_OFFSET)
-#define __va(x) ((void *)((unsigned long)(x) + PMB_OFFSET))
-#elif defined(CONFIG_32BIT)
+#ifdef CONFIG_PMB
#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET+__MEMORY_START)
#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET-__MEMORY_START))
#else
@@ -140,6 +135,14 @@ typedef struct page *pgtable_t;
#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
#endif
+#ifdef CONFIG_UNCACHED_MAPPING
+#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + uncached_start)
+#define CAC_ADDR(addr) ((addr) - uncached_start + PAGE_OFFSET)
+#else
+#define UNCAC_ADDR(addr) ((addr))
+#define CAC_ADDR(addr) ((addr))
+#endif
+
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
diff --git a/arch/sh/include/asm/ptrace.h b/arch/sh/include/asm/ptrace.h
index e879dffa324b..e11b14ea2c43 100644
--- a/arch/sh/include/asm/ptrace.h
+++ b/arch/sh/include/asm/ptrace.h
@@ -139,15 +139,8 @@ static inline unsigned long profile_pc(struct pt_regs *regs)
{
unsigned long pc = instruction_pointer(regs);
-#ifdef CONFIG_UNCACHED_MAPPING
- /*
- * If PC points in to the uncached mapping, fix it up and hand
- * back the cached equivalent.
- */
- if ((pc >= (memory_start + cached_to_uncached)) &&
- (pc < (memory_start + cached_to_uncached + uncached_size)))
- pc -= cached_to_uncached;
-#endif
+ if (virt_addr_uncached(pc))
+ return CAC_ADDR(pc);
return pc;
}
diff --git a/arch/sh/include/asm/uncached.h b/arch/sh/include/asm/uncached.h
new file mode 100644
index 000000000000..e3419f96626a
--- /dev/null
+++ b/arch/sh/include/asm/uncached.h
@@ -0,0 +1,18 @@
+#ifndef __ASM_SH_UNCACHED_H
+#define __ASM_SH_UNCACHED_H
+
+#include <linux/bug.h>
+
+#ifdef CONFIG_UNCACHED_MAPPING
+extern unsigned long uncached_start, uncached_end;
+
+extern int virt_addr_uncached(unsigned long kaddr);
+extern void uncached_init(void);
+extern void uncached_resize(unsigned long size);
+#else
+#define virt_addr_uncached(kaddr) (0)
+#define uncached_init() do { } while (0)
+#define uncached_resize(size) BUG()
+#endif
+
+#endif /* __ASM_SH_UNCACHED_H */
diff --git a/arch/sh/include/cpu-sh4/cpu/sq.h b/arch/sh/include/cpu-sh4/cpu/sq.h
index 586d6491816a..74716ba2dc3c 100644
--- a/arch/sh/include/cpu-sh4/cpu/sq.h
+++ b/arch/sh/include/cpu-sh4/cpu/sq.h
@@ -12,6 +12,7 @@
#define __ASM_CPU_SH4_SQ_H
#include <asm/addrspace.h>
+#include <asm/page.h>
/*
* Store queues range from e0000000-e3fffffc, allowing approx. 64MB to be
@@ -28,7 +29,7 @@
/* arch/sh/kernel/cpu/sh4/sq.c */
unsigned long sq_remap(unsigned long phys, unsigned int size,
- const char *name, unsigned long flags);
+ const char *name, pgprot_t prot);
void sq_unmap(unsigned long vaddr);
void sq_flush_range(unsigned long start, unsigned int len);
diff --git a/arch/sh/kernel/cpu/init.c b/arch/sh/kernel/cpu/init.c
index 6311b0b1789d..c736422344eb 100644
--- a/arch/sh/kernel/cpu/init.c
+++ b/arch/sh/kernel/cpu/init.c
@@ -24,6 +24,7 @@
#include <asm/elf.h>
#include <asm/io.h>
#include <asm/smp.h>
+#include <asm/sh_bios.h>
#ifdef CONFIG_SH_FPU
#define cpu_has_fpu 1
@@ -342,9 +343,21 @@ asmlinkage void __init sh_cpu_init(void)
speculative_execution_init();
expmask_init();
- /*
- * Boot processor to setup the FP and extended state context info.
- */
- if (raw_smp_processor_id() == 0)
+ /* Do the rest of the boot processor setup */
+ if (raw_smp_processor_id() == 0) {
+ /* Save off the BIOS VBR, if there is one */
+ sh_bios_vbr_init();
+
+ /*
+ * Setup VBR for boot CPU. Secondary CPUs do this through
+ * start_secondary().
+ */
+ per_cpu_trap_init();
+
+ /*
+ * Boot processor to setup the FP and extended state
+ * context info.
+ */
init_thread_xstate();
+ }
}
diff --git a/arch/sh/kernel/cpu/sh4/sq.c b/arch/sh/kernel/cpu/sh4/sq.c
index 97aea9d69b00..fc065f9da6e5 100644
--- a/arch/sh/kernel/cpu/sh4/sq.c
+++ b/arch/sh/kernel/cpu/sh4/sq.c
@@ -100,7 +100,7 @@ static inline void sq_mapping_list_del(struct sq_mapping *map)
spin_unlock_irq(&sq_mapping_lock);
}
-static int __sq_remap(struct sq_mapping *map, unsigned long flags)
+static int __sq_remap(struct sq_mapping *map, pgprot_t prot)
{
#if defined(CONFIG_MMU)
struct vm_struct *vma;
@@ -113,7 +113,7 @@ static int __sq_remap(struct sq_mapping *map, unsigned long flags)
if (ioremap_page_range((unsigned long)vma->addr,
(unsigned long)vma->addr + map->size,
- vma->phys_addr, __pgprot(flags))) {
+ vma->phys_addr, prot)) {
vunmap(vma->addr);
return -EAGAIN;
}
@@ -135,14 +135,14 @@ static int __sq_remap(struct sq_mapping *map, unsigned long flags)
* @phys: Physical address of mapping.
* @size: Length of mapping.
* @name: User invoking mapping.
- * @flags: Protection flags.
+ * @prot: Protection bits.
*
* Remaps the physical address @phys through the next available store queue
* address of @size length. @name is logged at boot time as well as through
* the sysfs interface.
*/
unsigned long sq_remap(unsigned long phys, unsigned int size,
- const char *name, unsigned long flags)
+ const char *name, pgprot_t prot)
{
struct sq_mapping *map;
unsigned long end;
@@ -177,7 +177,7 @@ unsigned long sq_remap(unsigned long phys, unsigned int size,
map->sq_addr = P4SEG_STORE_QUE + (page << PAGE_SHIFT);
- ret = __sq_remap(map, pgprot_val(PAGE_KERNEL_NOCACHE) | flags);
+ ret = __sq_remap(map, prot);
if (unlikely(ret != 0))
goto out;
@@ -309,8 +309,7 @@ static ssize_t mapping_store(const char *buf, size_t count)
return -EIO;
if (likely(len)) {
- int ret = sq_remap(base, len, "Userspace",
- pgprot_val(PAGE_SHARED));
+ int ret = sq_remap(base, len, "Userspace", PAGE_SHARED);
if (ret < 0)
return ret;
} else
diff --git a/arch/sh/kernel/head_32.S b/arch/sh/kernel/head_32.S
index 83f2b84b58da..fe0b743881b0 100644
--- a/arch/sh/kernel/head_32.S
+++ b/arch/sh/kernel/head_32.S
@@ -85,7 +85,7 @@ ENTRY(_stext)
ldc r0, r7_bank ! ... and initial thread_info
#endif
-#if defined(CONFIG_PMB) && !defined(CONFIG_PMB_LEGACY)
+#ifdef CONFIG_PMB
/*
* Reconfigure the initial PMB mappings setup by the hardware.
*
@@ -139,7 +139,6 @@ ENTRY(_stext)
mov.l r0, @r1
mov.l .LMEMORY_SIZE, r5
- mov r5, r7
mov #PMB_E_SHIFT, r0
mov #0x1, r4
@@ -150,8 +149,43 @@ ENTRY(_stext)
mov.l .LFIRST_ADDR_ENTRY, r2
mov.l .LPMB_ADDR, r3
+ /*
+ * First we need to walk the PMB and figure out if there are any
+ * existing mappings that match the initial mappings VPN/PPN.
+ * If these have already been established by the bootloader, we
+ * don't bother setting up new entries here, and let the late PMB
+ * initialization take care of things instead.
+ *
+ * Note that we may need to coalesce and merge entries in order
+ * to reclaim more available PMB slots, which is much more than
+ * we want to do at this early stage.
+ */
+ mov #0, r10
+ mov #NR_PMB_ENTRIES, r9
+
+ mov r1, r7 /* temporary PMB_DATA iter */
+
+.Lvalidate_existing_mappings:
+
+ mov.l @r7, r8
+ and r0, r8
+ cmp/eq r0, r8 /* Check for valid __MEMORY_START mappings */
+ bt .Lpmb_done
+
+ add #1, r10 /* Increment the loop counter */
+ cmp/eq r9, r10
+ bf/s .Lvalidate_existing_mappings
+ add r4, r7 /* Increment to the next PMB_DATA entry */
+
+ /*
+ * If we've fallen through, continue with setting up the initial
+ * mappings.
+ */
+
+ mov r5, r7 /* cached_to_uncached */
mov #0, r10
+#ifdef CONFIG_UNCACHED_MAPPING
/*
* Uncached mapping
*/
@@ -171,6 +205,7 @@ ENTRY(_stext)
add r4, r1
add r4, r3
add #1, r10
+#endif
/*
* Iterate over all of the available sizes from largest to
@@ -216,6 +251,7 @@ ENTRY(_stext)
__PMB_ITER_BY_SIZE(64)
__PMB_ITER_BY_SIZE(16)
+#ifdef CONFIG_UNCACHED_MAPPING
/*
* Now that we can access it, update cached_to_uncached and
* uncached_size.
@@ -228,6 +264,7 @@ ENTRY(_stext)
shll16 r7
shll8 r7
mov.l r7, @r0
+#endif
/*
* Clear the remaining PMB entries.
@@ -236,7 +273,7 @@ ENTRY(_stext)
* r10 = number of entries we've setup so far
*/
mov #0, r1
- mov #PMB_ENTRY_MAX, r0
+ mov #NR_PMB_ENTRIES, r0
.Lagain:
mov.l r1, @r3 /* Clear PMB_ADDR entry */
@@ -248,7 +285,8 @@ ENTRY(_stext)
mov.l 6f, r0
icbi @r0
-#endif /* !CONFIG_PMB_LEGACY */
+.Lpmb_done:
+#endif /* CONFIG_PMB */
#ifndef CONFIG_SH_NO_BSS_INIT
/*
@@ -300,13 +338,15 @@ ENTRY(stack_start)
6: .long sh_cpu_init
7: .long init_thread_union
-#if defined(CONFIG_PMB) && !defined(CONFIG_PMB_LEGACY)
+#ifdef CONFIG_PMB
.LPMB_ADDR: .long PMB_ADDR
.LPMB_DATA: .long PMB_DATA
.LFIRST_ADDR_ENTRY: .long PAGE_OFFSET | PMB_V
.LFIRST_DATA_ENTRY: .long __MEMORY_START | PMB_V
.LMMUCR: .long MMUCR
+.LMEMORY_SIZE: .long __MEMORY_SIZE
+#ifdef CONFIG_UNCACHED_MAPPING
.Lcached_to_uncached: .long cached_to_uncached
.Luncached_size: .long uncached_size
-.LMEMORY_SIZE: .long __MEMORY_SIZE
+#endif
#endif
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index e187750dd319..3459e70eed72 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -421,6 +421,8 @@ void __init setup_arch(char **cmdline_p)
parse_early_param();
+ uncached_init();
+
plat_early_device_setup();
/* Let earlyprintk output early console messages */
diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c
index 9c090cb68878..c3d86fa71ddf 100644
--- a/arch/sh/kernel/traps_32.c
+++ b/arch/sh/kernel/traps_32.c
@@ -30,7 +30,6 @@
#include <asm/alignment.h>
#include <asm/fpu.h>
#include <asm/kprobes.h>
-#include <asm/sh_bios.h>
#ifdef CONFIG_CPU_SH2
# define TRAP_RESERVED_INST 4
@@ -848,12 +847,6 @@ void __init trap_init(void)
#ifdef TRAP_UBC
set_exception_table_vec(TRAP_UBC, breakpoint_trap_handler);
#endif
-
- /* Save off the BIOS VBR, if there is one */
- sh_bios_vbr_init();
-
- /* Setup VBR for boot cpu */
- per_cpu_trap_init();
}
void show_stack(struct task_struct *tsk, unsigned long *sp)
diff --git a/arch/sh/kernel/vmlinux.lds.S b/arch/sh/kernel/vmlinux.lds.S
index 0e66c7b30e0f..7f8a709c3ada 100644
--- a/arch/sh/kernel/vmlinux.lds.S
+++ b/arch/sh/kernel/vmlinux.lds.S
@@ -14,11 +14,10 @@ OUTPUT_ARCH(sh)
#include <asm/cache.h>
#include <asm/vmlinux.lds.h>
-#if defined(CONFIG_29BIT) || defined(CONFIG_SUPERH64) || \
- defined(CONFIG_PMB_LEGACY)
- #define MEMORY_OFFSET __MEMORY_START
+#ifdef CONFIG_PMB
+ #define MEMORY_OFFSET 0
#else
- #define MEMORY_OFFSET 0
+ #define MEMORY_OFFSET __MEMORY_START
#endif
ENTRY(_start)
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 65cb5b83e072..1445ca6257df 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -91,16 +91,6 @@ config PMB
32-bits through the SH-4A PMB. If this is not set, legacy
29-bit physical addressing will be used.
-config PMB_LEGACY
- bool "Support legacy boot mappings for PMB"
- depends on PMB
- select 32BIT
- help
- If this option is enabled, fixed PMB mappings are inherited
- from the boot loader, and the kernel does not attempt dynamic
- management. This is the closest to legacy 29-bit physical mode,
- and allows systems to support up to 512MiB of system memory.
-
config X2TLB
def_bool y
depends on (CPU_SHX2 || CPU_SHX3) && MMU
diff --git a/arch/sh/mm/Makefile b/arch/sh/mm/Makefile
index de714cbd961a..3dc8a8a63822 100644
--- a/arch/sh/mm/Makefile
+++ b/arch/sh/mm/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_PMB) += pmb.o
obj-$(CONFIG_NUMA) += numa.o
obj-$(CONFIG_IOREMAP_FIXED) += ioremap_fixed.o
+obj-$(CONFIG_UNCACHED_MAPPING) += uncached.o
# Special flags for fault_64.o. This puts restrictions on the number of
# caller-save registers that the compiler can target when building this file.
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 58012b6bbe76..68028e8f26ce 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -26,21 +26,6 @@
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
pgd_t swapper_pg_dir[PTRS_PER_PGD];
-#ifdef CONFIG_UNCACHED_MAPPING
-/*
- * This is the offset of the uncached section from its cached alias.
- *
- * Legacy platforms handle trivial transitions between cached and
- * uncached segments by making use of the 1:1 mapping relationship in
- * 512MB lowmem, others via a special uncached mapping.
- *
- * Default value only valid in 29 bit mode, in 32bit mode this will be
- * updated by the early PMB initialization code.
- */
-unsigned long cached_to_uncached = 0x20000000;
-unsigned long uncached_size = SZ_512M;
-#endif
-
#ifdef CONFIG_MMU
static pte_t *__get_pte_phys(unsigned long addr)
{
@@ -260,7 +245,6 @@ void __init mem_init(void)
memset(empty_zero_page, 0, PAGE_SIZE);
__flush_wback_region(empty_zero_page, PAGE_SIZE);
- /* Initialize the vDSO */
vsyscall_init();
codesize = (unsigned long) &_etext - (unsigned long) &_text;
@@ -303,9 +287,7 @@ void __init mem_init(void)
((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
#ifdef CONFIG_UNCACHED_MAPPING
- (unsigned long)memory_start + cached_to_uncached,
- (unsigned long)memory_start + cached_to_uncached + uncached_size,
- uncached_size >> 20,
+ uncached_start, uncached_end, uncached_size >> 20,
#endif
(unsigned long)&__init_begin, (unsigned long)&__init_end,
diff --git a/arch/sh/mm/ioremap.c b/arch/sh/mm/ioremap.c
index 94583c5da855..c68d2d7d00a9 100644
--- a/arch/sh/mm/ioremap.c
+++ b/arch/sh/mm/ioremap.c
@@ -80,7 +80,7 @@ __ioremap_caller(unsigned long phys_addr, unsigned long size,
if (unlikely(phys_addr >= P1SEG)) {
unsigned long mapped;
- mapped = pmb_remap(addr, phys_addr, size, pgprot_val(pgprot));
+ mapped = pmb_remap(addr, phys_addr, size, pgprot);
if (likely(mapped)) {
addr += mapped;
phys_addr += mapped;
diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c
index 3c9bf5b5c36f..198bcff5e96f 100644
--- a/arch/sh/mm/pmb.c
+++ b/arch/sh/mm/pmb.c
@@ -21,47 +21,67 @@
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+#include <linux/rwlock.h>
+#include <asm/sizes.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
+#include <asm/page.h>
#include <asm/mmu.h>
-#include <asm/io.h>
#include <asm/mmu_context.h>
-#define NR_PMB_ENTRIES 16
+struct pmb_entry;
-static void __pmb_unmap(struct pmb_entry *);
+struct pmb_entry {
+ unsigned long vpn;
+ unsigned long ppn;
+ unsigned long flags;
+ unsigned long size;
+
+ spinlock_t lock;
+
+ /*
+ * 0 .. NR_PMB_ENTRIES for specific entry selection, or
+ * PMB_NO_ENTRY to search for a free one
+ */
+ int entry;
+
+ /* Adjacent entry link for contiguous multi-entry mappings */
+ struct pmb_entry *link;
+};
+
+static void pmb_unmap_entry(struct pmb_entry *, int depth);
+static DEFINE_RWLOCK(pmb_rwlock);
static struct pmb_entry pmb_entry_list[NR_PMB_ENTRIES];
-static unsigned long pmb_map;
+static DECLARE_BITMAP(pmb_map, NR_PMB_ENTRIES);
-static inline unsigned long mk_pmb_entry(unsigned int entry)
+static __always_inline unsigned long mk_pmb_entry(unsigned int entry)
{
return (entry & PMB_E_MASK) << PMB_E_SHIFT;
}
-static inline unsigned long mk_pmb_addr(unsigned int entry)
+static __always_inline unsigned long mk_pmb_addr(unsigned int entry)
{
return mk_pmb_entry(entry) | PMB_ADDR;
}
-static inline unsigned long mk_pmb_data(unsigned int entry)
+static __always_inline unsigned long mk_pmb_data(unsigned int entry)
{
return mk_pmb_entry(entry) | PMB_DATA;
}
static int pmb_alloc_entry(void)
{
- unsigned int pos;
-
-repeat:
- pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
-
- if (unlikely(pos > NR_PMB_ENTRIES))
- return -ENOSPC;
+ int pos;
- if (test_and_set_bit(pos, &pmb_map))
- goto repeat;
+ pos = find_first_zero_bit(pmb_map, NR_PMB_ENTRIES);
+ if (pos >= 0 && pos < NR_PMB_ENTRIES)
+ __set_bit(pos, pmb_map);
+ else
+ pos = -ENOSPC;
return pos;
}
@@ -70,21 +90,34 @@ static struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
unsigned long flags, int entry)
{
struct pmb_entry *pmbe;
+ unsigned long irqflags;
+ void *ret = NULL;
int pos;
+ write_lock_irqsave(&pmb_rwlock, irqflags);
+
if (entry == PMB_NO_ENTRY) {
pos = pmb_alloc_entry();
- if (pos < 0)
- return ERR_PTR(pos);
+ if (unlikely(pos < 0)) {
+ ret = ERR_PTR(pos);
+ goto out;
+ }
} else {
- if (test_bit(entry, &pmb_map))
- return ERR_PTR(-ENOSPC);
+ if (__test_and_set_bit(entry, pmb_map)) {
+ ret = ERR_PTR(-ENOSPC);
+ goto out;
+ }
+
pos = entry;
}
+ write_unlock_irqrestore(&pmb_rwlock, irqflags);
+
pmbe = &pmb_entry_list[pos];
- if (!pmbe)
- return ERR_PTR(-ENOMEM);
+
+ memset(pmbe, 0, sizeof(struct pmb_entry));
+
+ spin_lock_init(&pmbe->lock);
pmbe->vpn = vpn;
pmbe->ppn = ppn;
@@ -92,101 +125,113 @@ static struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
pmbe->entry = pos;
return pmbe;
+
+out:
+ write_unlock_irqrestore(&pmb_rwlock, irqflags);
+ return ret;
}
static void pmb_free(struct pmb_entry *pmbe)
{
- int pos = pmbe->entry;
-
- pmbe->vpn = 0;
- pmbe->ppn = 0;
- pmbe->flags = 0;
- pmbe->entry = 0;
+ __clear_bit(pmbe->entry, pmb_map);
- clear_bit(pos, &pmb_map);
+ pmbe->entry = PMB_NO_ENTRY;
+ pmbe->link = NULL;
}
/*
- * Must be in P2 for __set_pmb_entry()
+ * Ensure that the PMB entries match our cache configuration.
+ *
+ * When we are in 32-bit address extended mode, CCR.CB becomes
+ * invalid, so care must be taken to manually adjust cacheable
+ * translations.
*/
-static void __set_pmb_entry(unsigned long vpn, unsigned long ppn,
- unsigned long flags, int pos)
+static __always_inline unsigned long pmb_cache_flags(void)
{
- __raw_writel(vpn | PMB_V, mk_pmb_addr(pos));
+ unsigned long flags = 0;
-#ifdef CONFIG_CACHE_WRITETHROUGH
- /*
- * When we are in 32-bit address extended mode, CCR.CB becomes
- * invalid, so care must be taken to manually adjust cacheable
- * translations.
- */
- if (likely(flags & PMB_C))
- flags |= PMB_WT;
+#if defined(CONFIG_CACHE_WRITETHROUGH)
+ flags |= PMB_C | PMB_WT | PMB_UB;
+#elif defined(CONFIG_CACHE_WRITEBACK)
+ flags |= PMB_C;
#endif
- __raw_writel(ppn | flags | PMB_V, mk_pmb_data(pos));
+ return flags;
}
-static void set_pmb_entry(struct pmb_entry *pmbe)
+/*
+ * Must be run uncached.
+ */
+static void __set_pmb_entry(struct pmb_entry *pmbe)
{
- jump_to_uncached();
- __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, pmbe->entry);
- back_to_cached();
+ writel_uncached(pmbe->vpn | PMB_V, mk_pmb_addr(pmbe->entry));
+ writel_uncached(pmbe->ppn | pmbe->flags | PMB_V,
+ mk_pmb_data(pmbe->entry));
}
-static void clear_pmb_entry(struct pmb_entry *pmbe)
+static void __clear_pmb_entry(struct pmb_entry *pmbe)
{
- unsigned int entry = pmbe->entry;
- unsigned long addr;
+ unsigned long addr, data;
+ unsigned long addr_val, data_val;
- if (unlikely(entry >= NR_PMB_ENTRIES))
- return;
+ addr = mk_pmb_addr(pmbe->entry);
+ data = mk_pmb_data(pmbe->entry);
- jump_to_uncached();
+ addr_val = __raw_readl(addr);
+ data_val = __raw_readl(data);
/* Clear V-bit */
- addr = mk_pmb_addr(entry);
- __raw_writel(__raw_readl(addr) & ~PMB_V, addr);
+ writel_uncached(addr_val & ~PMB_V, addr);
+ writel_uncached(data_val & ~PMB_V, data);
+}
- addr = mk_pmb_data(entry);
- __raw_writel(__raw_readl(addr) & ~PMB_V, addr);
+static void set_pmb_entry(struct pmb_entry *pmbe)
+{
+ unsigned long flags;
- back_to_cached();
+ spin_lock_irqsave(&pmbe->lock, flags);
+ __set_pmb_entry(pmbe);
+ spin_unlock_irqrestore(&pmbe->lock, flags);
}
-
static struct {
unsigned long size;
int flag;
} pmb_sizes[] = {
- { .size = 0x20000000, .flag = PMB_SZ_512M, },
- { .size = 0x08000000, .flag = PMB_SZ_128M, },
- { .size = 0x04000000, .flag = PMB_SZ_64M, },
- { .size = 0x01000000, .flag = PMB_SZ_16M, },
+ { .size = SZ_512M, .flag = PMB_SZ_512M, },
+ { .size = SZ_128M, .flag = PMB_SZ_128M, },
+ { .size = SZ_64M, .flag = PMB_SZ_64M, },
+ { .size = SZ_16M, .flag = PMB_SZ_16M, },
};
long pmb_remap(unsigned long vaddr, unsigned long phys,
- unsigned long size, unsigned long flags)
+ unsigned long size, pgprot_t prot)
{
struct pmb_entry *pmbp, *pmbe;
unsigned long wanted;
int pmb_flags, i;
long err;
+ u64 flags;
+
+ flags = pgprot_val(prot);
+
+ pmb_flags = PMB_WT | PMB_UB;
/* Convert typical pgprot value to the PMB equivalent */
if (flags & _PAGE_CACHABLE) {
- if (flags & _PAGE_WT)
- pmb_flags = PMB_WT;
- else
- pmb_flags = PMB_C;
- } else
- pmb_flags = PMB_WT | PMB_UB;
+ pmb_flags |= PMB_C;
+
+ if ((flags & _PAGE_WT) == 0)
+ pmb_flags &= ~(PMB_WT | PMB_UB);
+ }
pmbp = NULL;
wanted = size;
again:
for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) {
+ unsigned long flags;
+
if (size < pmb_sizes[i].size)
continue;
@@ -197,18 +242,25 @@ again:
goto out;
}
- set_pmb_entry(pmbe);
+ spin_lock_irqsave(&pmbe->lock, flags);
+
+ __set_pmb_entry(pmbe);
phys += pmb_sizes[i].size;
vaddr += pmb_sizes[i].size;
size -= pmb_sizes[i].size;
+ pmbe->size = pmb_sizes[i].size;
+
/*
* Link adjacent entries that span multiple PMB entries
* for easier tear-down.
*/
- if (likely(pmbp))
+ if (likely(pmbp)) {
+ spin_lock(&pmbp->lock);
pmbp->link = pmbe;
+ spin_unlock(&pmbp->lock);
+ }
pmbp = pmbe;
@@ -218,16 +270,17 @@ again:
* pmb_sizes[i].size again.
*/
i--;
+
+ spin_unlock_irqrestore(&pmbe->lock, flags);
}
- if (size >= 0x1000000)
+ if (size >= SZ_16M)
goto again;
return wanted - size;
out:
- if (pmbp)
- __pmb_unmap(pmbp);
+ pmb_unmap_entry(pmbp, NR_PMB_ENTRIES);
return err;
}
@@ -237,24 +290,52 @@ void pmb_unmap(unsigned long addr)
struct pmb_entry *pmbe = NULL;
int i;
+ read_lock(&pmb_rwlock);
+
for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
- if (test_bit(i, &pmb_map)) {
+ if (test_bit(i, pmb_map)) {
pmbe = &pmb_entry_list[i];
if (pmbe->vpn == addr)
break;
}
}
- if (unlikely(!pmbe))
- return;
+ read_unlock(&pmb_rwlock);
+
+ pmb_unmap_entry(pmbe, NR_PMB_ENTRIES);
+}
+
+static bool pmb_can_merge(struct pmb_entry *a, struct pmb_entry *b)
+{
+ return (b->vpn == (a->vpn + a->size)) &&
+ (b->ppn == (a->ppn + a->size)) &&
+ (b->flags == a->flags);
+}
+
+static bool pmb_size_valid(unsigned long size)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++)
+ if (pmb_sizes[i].size == size)
+ return true;
- __pmb_unmap(pmbe);
+ return false;
}
-static void __pmb_unmap(struct pmb_entry *pmbe)
+static int pmb_size_to_flags(unsigned long size)
{
- BUG_ON(!test_bit(pmbe->entry, &pmb_map));
+ int i;
+ for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++)
+ if (pmb_sizes[i].size == size)
+ return pmb_sizes[i].flag;
+
+ return 0;
+}
+
+static void __pmb_unmap_entry(struct pmb_entry *pmbe, int depth)
+{
do {
struct pmb_entry *pmblink = pmbe;
@@ -265,52 +346,91 @@ static void __pmb_unmap(struct pmb_entry *pmbe)
* this entry in pmb_alloc() (even if we haven't filled
* it yet).
*
- * Therefore, calling clear_pmb_entry() is safe as no
+ * Therefore, calling __clear_pmb_entry() is safe as no
* other mapping can be using that slot.
*/
- clear_pmb_entry(pmbe);
+ __clear_pmb_entry(pmbe);
pmbe = pmblink->link;
pmb_free(pmblink);
- } while (pmbe);
+ } while (pmbe && --depth);
+}
+
+static void pmb_unmap_entry(struct pmb_entry *pmbe, int depth)
+{
+ unsigned long flags;
+
+ if (unlikely(!pmbe))
+ return;
+
+ write_lock_irqsave(&pmb_rwlock, flags);
+ __pmb_unmap_entry(pmbe, depth);
+ write_unlock_irqrestore(&pmb_rwlock, flags);
}
-#ifdef CONFIG_PMB_LEGACY
-static inline unsigned int pmb_ppn_in_range(unsigned long ppn)
+static __always_inline unsigned int pmb_ppn_in_range(unsigned long ppn)
{
- return ppn >= __MEMORY_START && ppn < __MEMORY_START + __MEMORY_SIZE;
+ return ppn >= __pa(memory_start) && ppn < __pa(memory_end);
}
-static int pmb_apply_legacy_mappings(void)
+static void __init pmb_notify(void)
{
- unsigned int applied = 0;
int i;
- pr_info("PMB: Preserving legacy mappings:\n");
+ pr_info("PMB: boot mappings:\n");
+
+ read_lock(&pmb_rwlock);
+
+ for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
+ struct pmb_entry *pmbe;
+
+ if (!test_bit(i, pmb_map))
+ continue;
+
+ pmbe = &pmb_entry_list[i];
+
+ pr_info(" 0x%08lx -> 0x%08lx [ %4ldMB %2scached ]\n",
+ pmbe->vpn >> PAGE_SHIFT, pmbe->ppn >> PAGE_SHIFT,
+ pmbe->size >> 20, (pmbe->flags & PMB_C) ? "" : "un");
+ }
+
+ read_unlock(&pmb_rwlock);
+}
+
+/*
+ * Sync our software copy of the PMB mappings with those in hardware. The
+ * mappings in the hardware PMB were either set up by the bootloader or
+ * very early on by the kernel.
+ */
+static void __init pmb_synchronize(void)
+{
+ struct pmb_entry *pmbp = NULL;
+ int i, j;
/*
- * The following entries are setup by the bootloader.
+ * Run through the initial boot mappings, log the established
+ * ones, and blow away anything that falls outside of the valid
+ * PPN range. Specifically, we only care about existing mappings
+ * that impact the cached/uncached sections.
*
- * Entry VPN PPN V SZ C UB
- * --------------------------------------------------------
- * 0 0xA0000000 0x00000000 1 64MB 0 0
- * 1 0xA4000000 0x04000000 1 16MB 0 0
- * 2 0xA6000000 0x08000000 1 16MB 0 0
- * 9 0x88000000 0x48000000 1 128MB 1 1
- * 10 0x90000000 0x50000000 1 128MB 1 1
- * 11 0x98000000 0x58000000 1 128MB 1 1
- * 13 0xA8000000 0x48000000 1 128MB 0 0
- * 14 0xB0000000 0x50000000 1 128MB 0 0
- * 15 0xB8000000 0x58000000 1 128MB 0 0
+ * Note that touching these can be a bit of a minefield; the boot
+ * loader can establish multi-page mappings with the same caching
+ * attributes, so we need to ensure that we aren't modifying a
+ * mapping that we're presently executing from, or may execute
+ * from in the case of straddling page boundaries.
*
- * The only entries the we need are the ones that map the kernel
- * at the cached and uncached addresses.
+ * In the future we will have to tidy up after the boot loader by
+ * jumping between the cached and uncached mappings and tearing
+ * down alternating mappings while executing from the other.
*/
- for (i = 0; i < PMB_ENTRY_MAX; i++) {
+ for (i = 0; i < NR_PMB_ENTRIES; i++) {
unsigned long addr, data;
unsigned long addr_val, data_val;
- unsigned long ppn, vpn;
+ unsigned long ppn, vpn, flags;
+ unsigned long irqflags;
+ unsigned int size;
+ struct pmb_entry *pmbe;
addr = mk_pmb_addr(i);
data = mk_pmb_data(i);
@@ -330,110 +450,202 @@ static int pmb_apply_legacy_mappings(void)
/*
* Only preserve in-range mappings.
*/
- if (pmb_ppn_in_range(ppn)) {
- unsigned int size;
- char *sz_str = NULL;
+ if (!pmb_ppn_in_range(ppn)) {
+ /*
+ * Invalidate anything out of bounds.
+ */
+ writel_uncached(addr_val & ~PMB_V, addr);
+ writel_uncached(data_val & ~PMB_V, data);
+ continue;
+ }
+
+ /*
+ * Update the caching attributes if necessary
+ */
+ if (data_val & PMB_C) {
+ data_val &= ~PMB_CACHE_MASK;
+ data_val |= pmb_cache_flags();
+
+ writel_uncached(data_val, data);
+ }
+
+ size = data_val & PMB_SZ_MASK;
+ flags = size | (data_val & PMB_CACHE_MASK);
- size = data_val & PMB_SZ_MASK;
+ pmbe = pmb_alloc(vpn, ppn, flags, i);
+ if (IS_ERR(pmbe)) {
+ WARN_ON_ONCE(1);
+ continue;
+ }
+
+ spin_lock_irqsave(&pmbe->lock, irqflags);
- sz_str = (size == PMB_SZ_16M) ? " 16MB":
- (size == PMB_SZ_64M) ? " 64MB":
- (size == PMB_SZ_128M) ? "128MB":
- "512MB";
+ for (j = 0; j < ARRAY_SIZE(pmb_sizes); j++)
+ if (pmb_sizes[j].flag == size)
+ pmbe->size = pmb_sizes[j].size;
- pr_info("\t0x%08lx -> 0x%08lx [ %s %scached ]\n",
- vpn >> PAGE_SHIFT, ppn >> PAGE_SHIFT, sz_str,
- (data_val & PMB_C) ? "" : "un");
+ if (pmbp) {
+ spin_lock(&pmbp->lock);
- applied++;
- } else {
/*
- * Invalidate anything out of bounds.
+ * Compare the previous entry against the current one to
+ * see if the entries span a contiguous mapping. If so,
+ * setup the entry links accordingly. Compound mappings
+ * are later coalesced.
*/
- __raw_writel(addr_val & ~PMB_V, addr);
- __raw_writel(data_val & ~PMB_V, data);
+ if (pmb_can_merge(pmbp, pmbe))
+ pmbp->link = pmbe;
+
+ spin_unlock(&pmbp->lock);
}
- }
- return (applied == 0);
+ pmbp = pmbe;
+
+ spin_unlock_irqrestore(&pmbe->lock, irqflags);
+ }
}
-#else
-static inline int pmb_apply_legacy_mappings(void)
+
+static void __init pmb_merge(struct pmb_entry *head)
{
- return 1;
+ unsigned long span, newsize;
+ struct pmb_entry *tail;
+ int i = 1, depth = 0;
+
+ span = newsize = head->size;
+
+ tail = head->link;
+ while (tail) {
+ span += tail->size;
+
+ if (pmb_size_valid(span)) {
+ newsize = span;
+ depth = i;
+ }
+
+ /* This is the end of the line.. */
+ if (!tail->link)
+ break;
+
+ tail = tail->link;
+ i++;
+ }
+
+ /*
+ * The merged page size must be valid.
+ */
+ if (!pmb_size_valid(newsize))
+ return;
+
+ head->flags &= ~PMB_SZ_MASK;
+ head->flags |= pmb_size_to_flags(newsize);
+
+ head->size = newsize;
+
+ __pmb_unmap_entry(head->link, depth);
+ __set_pmb_entry(head);
}
-#endif
-int pmb_init(void)
+static void __init pmb_coalesce(void)
{
+ unsigned long flags;
int i;
- unsigned long addr, data;
- unsigned long ret;
- jump_to_uncached();
+ write_lock_irqsave(&pmb_rwlock, flags);
- /*
- * Attempt to apply the legacy boot mappings if configured. If
- * this is successful then we simply carry on with those and
- * don't bother establishing additional memory mappings. Dynamic
- * device mappings through pmb_remap() can still be bolted on
- * after this.
- */
- ret = pmb_apply_legacy_mappings();
- if (ret == 0) {
- back_to_cached();
- return 0;
+ for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
+ struct pmb_entry *pmbe;
+
+ if (!test_bit(i, pmb_map))
+ continue;
+
+ pmbe = &pmb_entry_list[i];
+
+ /*
+ * We're only interested in compound mappings
+ */
+ if (!pmbe->link)
+ continue;
+
+ /*
+ * Nothing to do if it already uses the largest possible
+ * page size.
+ */
+ if (pmbe->size == SZ_512M)
+ continue;
+
+ pmb_merge(pmbe);
}
+ write_unlock_irqrestore(&pmb_rwlock, flags);
+}
+
+#ifdef CONFIG_UNCACHED_MAPPING
+static void __init pmb_resize(void)
+{
+ int i;
+
/*
- * Sync our software copy of the PMB mappings with those in
- * hardware. The mappings in the hardware PMB were either set up
- * by the bootloader or very early on by the kernel.
+ * If the uncached mapping was constructed by the kernel, it will
+ * already be a reasonable size.
*/
- for (i = 0; i < PMB_ENTRY_MAX; i++) {
+ if (uncached_size == SZ_16M)
+ return;
+
+ read_lock(&pmb_rwlock);
+
+ for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
struct pmb_entry *pmbe;
- unsigned long vpn, ppn, flags;
+ unsigned long flags;
- addr = PMB_DATA + (i << PMB_E_SHIFT);
- data = __raw_readl(addr);
- if (!(data & PMB_V))
+ if (!test_bit(i, pmb_map))
continue;
- if (data & PMB_C) {
-#if defined(CONFIG_CACHE_WRITETHROUGH)
- data |= PMB_WT;
-#elif defined(CONFIG_CACHE_WRITEBACK)
- data &= ~PMB_WT;
-#else
- data &= ~(PMB_C | PMB_WT);
-#endif
- }
- __raw_writel(data, addr);
+ pmbe = &pmb_entry_list[i];
- ppn = data & PMB_PFN_MASK;
+ if (pmbe->vpn != uncached_start)
+ continue;
- flags = data & (PMB_C | PMB_WT | PMB_UB);
- flags |= data & PMB_SZ_MASK;
+ /*
+ * Found it, now resize it.
+ */
+ spin_lock_irqsave(&pmbe->lock, flags);
- addr = PMB_ADDR + (i << PMB_E_SHIFT);
- data = __raw_readl(addr);
+ pmbe->size = SZ_16M;
+ pmbe->flags &= ~PMB_SZ_MASK;
+ pmbe->flags |= pmb_size_to_flags(pmbe->size);
- vpn = data & PMB_PFN_MASK;
+ uncached_resize(pmbe->size);
- pmbe = pmb_alloc(vpn, ppn, flags, i);
- WARN_ON(IS_ERR(pmbe));
+ __set_pmb_entry(pmbe);
+
+ spin_unlock_irqrestore(&pmbe->lock, flags);
}
- __raw_writel(0, PMB_IRMCR);
+ read_lock(&pmb_rwlock);
+}
+#endif
- /* Flush out the TLB */
- i = __raw_readl(MMUCR);
- i |= MMUCR_TI;
- __raw_writel(i, MMUCR);
+void __init pmb_init(void)
+{
+ /* Synchronize software state */
+ pmb_synchronize();
- back_to_cached();
+ /* Attempt to combine compound mappings */
+ pmb_coalesce();
- return 0;
+#ifdef CONFIG_UNCACHED_MAPPING
+ /* Resize initial mappings, if necessary */
+ pmb_resize();
+#endif
+
+ /* Log them */
+ pmb_notify();
+
+ writel_uncached(0, PMB_IRMCR);
+
+ /* Flush out the TLB */
+ __raw_writel(__raw_readl(MMUCR) | MMUCR_TI, MMUCR);
+ ctrl_barrier();
}
bool __in_29bit_mode(void)
@@ -513,14 +725,21 @@ static int pmb_sysdev_suspend(struct sys_device *dev, pm_message_t state)
if (state.event == PM_EVENT_ON &&
prev_state.event == PM_EVENT_FREEZE) {
struct pmb_entry *pmbe;
+
+ read_lock(&pmb_rwlock);
+
for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
- if (test_bit(i, &pmb_map)) {
+ if (test_bit(i, pmb_map)) {
pmbe = &pmb_entry_list[i];
set_pmb_entry(pmbe);
}
}
+
+ read_unlock(&pmb_rwlock);
}
+
prev_state = state;
+
return 0;
}
diff --git a/arch/sh/mm/uncached.c b/arch/sh/mm/uncached.c
new file mode 100644
index 000000000000..cf20a5c5136a
--- /dev/null
+++ b/arch/sh/mm/uncached.c
@@ -0,0 +1,34 @@
+#include <linux/init.h>
+#include <asm/sizes.h>
+#include <asm/page.h>
+
+/*
+ * This is the offset of the uncached section from its cached alias.
+ *
+ * Legacy platforms handle trivial transitions between cached and
+ * uncached segments by making use of the 1:1 mapping relationship in
+ * 512MB lowmem, others via a special uncached mapping.
+ *
+ * Default value only valid in 29 bit mode, in 32bit mode this will be
+ * updated by the early PMB initialization code.
+ */
+unsigned long cached_to_uncached = SZ_512M;
+unsigned long uncached_size = SZ_512M;
+unsigned long uncached_start, uncached_end;
+
+int virt_addr_uncached(unsigned long kaddr)
+{
+ return (kaddr >= uncached_start) && (kaddr < uncached_end);
+}
+
+void __init uncached_init(void)
+{
+ uncached_start = memory_end;
+ uncached_end = uncached_start + uncached_size;
+}
+
+void __init uncached_resize(unsigned long size)
+{
+ uncached_size = size;
+ uncached_end = uncached_start + uncached_size;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 02:15:41 +0000