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alistair23-linux/arch/mips/mm/c-tx39.c
Paul Gortmaker 078a55fc82 MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code 
commit 3747069b25e419f6b51395f48127e9812abc3596 upstream.

The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications.  For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.

After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out.  Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.

Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit  -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings.  In any case, they are temporary and harmless.

Here, we remove all the MIPS __cpuinit from C code and __CPUINIT
from asm files.  MIPS is interesting in this respect, because there
are also uasm users hiding behind their own renamed versions of the
__cpuinit macros.

[1] https://lkml.org/lkml/2013/5/20/589

[ralf@linux-mips.org: Folded in Paul's followup fix.]

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5494/
Patchwork: https://patchwork.linux-mips.org/patch/5495/
Patchwork: https://patchwork.linux-mips.org/patch/5509/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-07-14 19:36:51 -04:00

441 lines
11 KiB
C
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/*
* r2300.c: R2000 and R3000 specific mmu/cache code.
*
* Copyright (C) 1996 David S. Miller (davem@davemloft.net)
*
* with a lot of changes to make this thing work for R3000s
* Tx39XX R4k style caches added. HK
* Copyright (C) 1998, 1999, 2000 Harald Koerfgen
* Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <asm/cacheops.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/mmu_context.h>
#include <asm/isadep.h>
#include <asm/io.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
/* For R3000 cores with R4000 style caches */
static unsigned long icache_size, dcache_size; /* Size in bytes */
#include <asm/r4kcache.h>
extern int r3k_have_wired_reg; /* in r3k-tlb.c */
/* This sequence is required to ensure icache is disabled immediately */
#define TX39_STOP_STREAMING() \
__asm__ __volatile__( \
".set push\n\t" \
".set noreorder\n\t" \
"b 1f\n\t" \
"nop\n\t" \
"1:\n\t" \
".set pop" \
)
/* TX39H-style cache flush routines. */
static void tx39h_flush_icache_all(void)
{
unsigned long flags, config;
/* disable icache (set ICE#) */
local_irq_save(flags);
config = read_c0_conf();
write_c0_conf(config & ~TX39_CONF_ICE);
TX39_STOP_STREAMING();
blast_icache16();
write_c0_conf(config);
local_irq_restore(flags);
}
static void tx39h_dma_cache_wback_inv(unsigned long addr, unsigned long size)
{
/* Catch bad driver code */
BUG_ON(size == 0);
iob();
blast_inv_dcache_range(addr, addr + size);
}
/* TX39H2,TX39H3 */
static inline void tx39_blast_dcache_page(unsigned long addr)
{
if (current_cpu_type() != CPU_TX3912)
blast_dcache16_page(addr);
}
static inline void tx39_blast_dcache_page_indexed(unsigned long addr)
{
blast_dcache16_page_indexed(addr);
}
static inline void tx39_blast_dcache(void)
{
blast_dcache16();
}
static inline void tx39_blast_icache_page(unsigned long addr)
{
unsigned long flags, config;
/* disable icache (set ICE#) */
local_irq_save(flags);
config = read_c0_conf();
write_c0_conf(config & ~TX39_CONF_ICE);
TX39_STOP_STREAMING();
blast_icache16_page(addr);
write_c0_conf(config);
local_irq_restore(flags);
}
static inline void tx39_blast_icache_page_indexed(unsigned long addr)
{
unsigned long flags, config;
/* disable icache (set ICE#) */
local_irq_save(flags);
config = read_c0_conf();
write_c0_conf(config & ~TX39_CONF_ICE);
TX39_STOP_STREAMING();
blast_icache16_page_indexed(addr);
write_c0_conf(config);
local_irq_restore(flags);
}
static inline void tx39_blast_icache(void)
{
unsigned long flags, config;
/* disable icache (set ICE#) */
local_irq_save(flags);
config = read_c0_conf();
write_c0_conf(config & ~TX39_CONF_ICE);
TX39_STOP_STREAMING();
blast_icache16();
write_c0_conf(config);
local_irq_restore(flags);
}
static void tx39__flush_cache_vmap(void)
{
tx39_blast_dcache();
}
static void tx39__flush_cache_vunmap(void)
{
tx39_blast_dcache();
}
static inline void tx39_flush_cache_all(void)
{
if (!cpu_has_dc_aliases)
return;
tx39_blast_dcache();
}
static inline void tx39___flush_cache_all(void)
{
tx39_blast_dcache();
tx39_blast_icache();
}
static void tx39_flush_cache_mm(struct mm_struct *mm)
{
if (!cpu_has_dc_aliases)
return;
if (cpu_context(smp_processor_id(), mm) != 0)
tx39_blast_dcache();
}
static void tx39_flush_cache_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
if (!cpu_has_dc_aliases)
return;
if (!(cpu_context(smp_processor_id(), vma->vm_mm)))
return;
tx39_blast_dcache();
}
static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page, unsigned long pfn)
{
int exec = vma->vm_flags & VM_EXEC;
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgdp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
/*
* If ownes no valid ASID yet, cannot possibly have gotten
* this page into the cache.
*/
if (cpu_context(smp_processor_id(), mm) == 0)
return;
page &= PAGE_MASK;
pgdp = pgd_offset(mm, page);
pudp = pud_offset(pgdp, page);
pmdp = pmd_offset(pudp, page);
ptep = pte_offset(pmdp, page);
/*
* If the page isn't marked valid, the page cannot possibly be
* in the cache.
*/
if (!(pte_val(*ptep) & _PAGE_PRESENT))
return;
/*
* Doing flushes for another ASID than the current one is
* too difficult since stupid R4k caches do a TLB translation
* for every cache flush operation. So we do indexed flushes
* in that case, which doesn't overly flush the cache too much.
*/
if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) {
if (cpu_has_dc_aliases || exec)
tx39_blast_dcache_page(page);
if (exec)
tx39_blast_icache_page(page);
return;
}
/*
* Do indexed flush, too much work to get the (possible) TLB refills
* to work correctly.
*/
if (cpu_has_dc_aliases || exec)
tx39_blast_dcache_page_indexed(page);
if (exec)
tx39_blast_icache_page_indexed(page);
}
static void local_tx39_flush_data_cache_page(void * addr)
{
tx39_blast_dcache_page((unsigned long)addr);
}
static void tx39_flush_data_cache_page(unsigned long addr)
{
tx39_blast_dcache_page(addr);
}
static void tx39_flush_icache_range(unsigned long start, unsigned long end)
{
if (end - start > dcache_size)
tx39_blast_dcache();
else
protected_blast_dcache_range(start, end);
if (end - start > icache_size)
tx39_blast_icache();
else {
unsigned long flags, config;
/* disable icache (set ICE#) */
local_irq_save(flags);
config = read_c0_conf();
write_c0_conf(config & ~TX39_CONF_ICE);
TX39_STOP_STREAMING();
protected_blast_icache_range(start, end);
write_c0_conf(config);
local_irq_restore(flags);
}
}
static void tx39_flush_kernel_vmap_range(unsigned long vaddr, int size)
{
BUG();
}
static void tx39_dma_cache_wback_inv(unsigned long addr, unsigned long size)
{
unsigned long end;
if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
end = addr + size;
do {
tx39_blast_dcache_page(addr);
addr += PAGE_SIZE;
} while(addr != end);
} else if (size > dcache_size) {
tx39_blast_dcache();
} else {
blast_dcache_range(addr, addr + size);
}
}
static void tx39_dma_cache_inv(unsigned long addr, unsigned long size)
{
unsigned long end;
if (((size | addr) & (PAGE_SIZE - 1)) == 0) {
end = addr + size;
do {
tx39_blast_dcache_page(addr);
addr += PAGE_SIZE;
} while(addr != end);
} else if (size > dcache_size) {
tx39_blast_dcache();
} else {
blast_inv_dcache_range(addr, addr + size);
}
}
static void tx39_flush_cache_sigtramp(unsigned long addr)
{
unsigned long ic_lsize = current_cpu_data.icache.linesz;
unsigned long dc_lsize = current_cpu_data.dcache.linesz;
unsigned long config;
unsigned long flags;
protected_writeback_dcache_line(addr & ~(dc_lsize - 1));
/* disable icache (set ICE#) */
local_irq_save(flags);
config = read_c0_conf();
write_c0_conf(config & ~TX39_CONF_ICE);
TX39_STOP_STREAMING();
protected_flush_icache_line(addr & ~(ic_lsize - 1));
write_c0_conf(config);
local_irq_restore(flags);
}
static __init void tx39_probe_cache(void)
{
unsigned long config;
config = read_c0_conf();
icache_size = 1 << (10 + ((config & TX39_CONF_ICS_MASK) >>
TX39_CONF_ICS_SHIFT));
dcache_size = 1 << (10 + ((config & TX39_CONF_DCS_MASK) >>
TX39_CONF_DCS_SHIFT));
current_cpu_data.icache.linesz = 16;
switch (current_cpu_type()) {
case CPU_TX3912:
current_cpu_data.icache.ways = 1;
current_cpu_data.dcache.ways = 1;
current_cpu_data.dcache.linesz = 4;
break;
case CPU_TX3927:
current_cpu_data.icache.ways = 2;
current_cpu_data.dcache.ways = 2;
current_cpu_data.dcache.linesz = 16;
break;
case CPU_TX3922:
default:
current_cpu_data.icache.ways = 1;
current_cpu_data.dcache.ways = 1;
current_cpu_data.dcache.linesz = 16;
break;
}
}
void tx39_cache_init(void)
{
extern void build_clear_page(void);
extern void build_copy_page(void);
unsigned long config;
config = read_c0_conf();
config &= ~TX39_CONF_WBON;
write_c0_conf(config);
tx39_probe_cache();
switch (current_cpu_type()) {
case CPU_TX3912:
/* TX39/H core (writethru direct-map cache) */
__flush_cache_vmap = tx39__flush_cache_vmap;
__flush_cache_vunmap = tx39__flush_cache_vunmap;
flush_cache_all = tx39h_flush_icache_all;
__flush_cache_all = tx39h_flush_icache_all;
flush_cache_mm = (void *) tx39h_flush_icache_all;
flush_cache_range = (void *) tx39h_flush_icache_all;
flush_cache_page = (void *) tx39h_flush_icache_all;
flush_icache_range = (void *) tx39h_flush_icache_all;
local_flush_icache_range = (void *) tx39h_flush_icache_all;
flush_cache_sigtramp = (void *) tx39h_flush_icache_all;
local_flush_data_cache_page = (void *) tx39h_flush_icache_all;
flush_data_cache_page = (void *) tx39h_flush_icache_all;
_dma_cache_wback_inv = tx39h_dma_cache_wback_inv;
shm_align_mask = PAGE_SIZE - 1;
break;
case CPU_TX3922:
case CPU_TX3927:
default:
/* TX39/H2,H3 core (writeback 2way-set-associative cache) */
r3k_have_wired_reg = 1;
write_c0_wired(0); /* set 8 on reset... */
/* board-dependent init code may set WBON */
__flush_cache_vmap = tx39__flush_cache_vmap;
__flush_cache_vunmap = tx39__flush_cache_vunmap;
flush_cache_all = tx39_flush_cache_all;
__flush_cache_all = tx39___flush_cache_all;
flush_cache_mm = tx39_flush_cache_mm;
flush_cache_range = tx39_flush_cache_range;
flush_cache_page = tx39_flush_cache_page;
flush_icache_range = tx39_flush_icache_range;
local_flush_icache_range = tx39_flush_icache_range;
__flush_kernel_vmap_range = tx39_flush_kernel_vmap_range;
flush_cache_sigtramp = tx39_flush_cache_sigtramp;
local_flush_data_cache_page = local_tx39_flush_data_cache_page;
flush_data_cache_page = tx39_flush_data_cache_page;
_dma_cache_wback_inv = tx39_dma_cache_wback_inv;
_dma_cache_wback = tx39_dma_cache_wback_inv;
_dma_cache_inv = tx39_dma_cache_inv;
shm_align_mask = max_t(unsigned long,
(dcache_size / current_cpu_data.dcache.ways) - 1,
PAGE_SIZE - 1);
break;
}
current_cpu_data.icache.waysize = icache_size / current_cpu_data.icache.ways;
current_cpu_data.dcache.waysize = dcache_size / current_cpu_data.dcache.ways;
current_cpu_data.icache.sets =
current_cpu_data.icache.waysize / current_cpu_data.icache.linesz;
current_cpu_data.dcache.sets =
current_cpu_data.dcache.waysize / current_cpu_data.dcache.linesz;
if (current_cpu_data.dcache.waysize > PAGE_SIZE)
current_cpu_data.dcache.flags |= MIPS_CACHE_ALIASES;
current_cpu_data.icache.waybit = 0;
current_cpu_data.dcache.waybit = 0;
printk("Primary instruction cache %ldkB, linesize %d bytes\n",
icache_size >> 10, current_cpu_data.icache.linesz);
printk("Primary data cache %ldkB, linesize %d bytes\n",
dcache_size >> 10, current_cpu_data.dcache.linesz);
build_clear_page();
build_copy_page();
tx39h_flush_icache_all();
}
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