- 根目录:
- arch
- microblaze
- kernel
- cpu
- cache.c
/*
* Cache control for MicroBlaze cache memories
*
* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2007-2009 PetaLogix
* Copyright (C) 2007-2009 John Williams <john.williams@petalogix.com>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*/
#include <asm/cacheflush.h>
#include <linux/cache.h>
#include <asm/cpuinfo.h>
#include <asm/pvr.h>
static inline void __enable_icache_msr(void)
{
__asm__ __volatile__ (" msrset r0, %0;" \
"nop;" \
: : "i" (MSR_ICE) : "memory");
}
static inline void __disable_icache_msr(void)
{
__asm__ __volatile__ (" msrclr r0, %0;" \
"nop;" \
: : "i" (MSR_ICE) : "memory");
}
static inline void __enable_dcache_msr(void)
{
__asm__ __volatile__ (" msrset r0, %0;" \
"nop;" \
: : "i" (MSR_DCE) : "memory");
}
static inline void __disable_dcache_msr(void)
{
__asm__ __volatile__ (" msrclr r0, %0;" \
"nop; " \
: : "i" (MSR_DCE) : "memory");
}
static inline void __enable_icache_nomsr(void)
{
__asm__ __volatile__ (" mfs r12, rmsr;" \
"nop;" \
"ori r12, r12, %0;" \
"mts rmsr, r12;" \
"nop;" \
: : "i" (MSR_ICE) : "memory", "r12");
}
static inline void __disable_icache_nomsr(void)
{
__asm__ __volatile__ (" mfs r12, rmsr;" \
"nop;" \
"andi r12, r12, ~%0;" \
"mts rmsr, r12;" \
"nop;" \
: : "i" (MSR_ICE) : "memory", "r12");
}
static inline void __enable_dcache_nomsr(void)
{
__asm__ __volatile__ (" mfs r12, rmsr;" \
"nop;" \
"ori r12, r12, %0;" \
"mts rmsr, r12;" \
"nop;" \
: : "i" (MSR_DCE) : "memory", "r12");
}
static inline void __disable_dcache_nomsr(void)
{
__asm__ __volatile__ (" mfs r12, rmsr;" \
"nop;" \
"andi r12, r12, ~%0;" \
"mts rmsr, r12;" \
"nop;" \
: : "i" (MSR_DCE) : "memory", "r12");
}
/* Helper macro for computing the limits of cache range loops
*
* End address can be unaligned which is OK for C implementation.
* ASM implementation align it in ASM macros
*/
#define CACHE_LOOP_LIMITS(start, end, cache_line_length, cache_size) \
do { \
int align = ~(cache_line_length - 1); \
end = min(start + cache_size, end); \
start &= align; \
} while (0)
/*
* Helper macro to loop over the specified cache_size/line_length and
* execute 'op' on that cacheline
*/
#define CACHE_ALL_LOOP(cache_size, line_length, op) \
do { \
unsigned int len = cache_size - line_length; \
int step = -line_length; \
WARN_ON(step >= 0); \
\
__asm__ __volatile__ (" 1: " #op " %0, r0;" \
"bgtid %0, 1b;" \
"addk %0, %0, %1;" \
: : "r" (len), "r" (step) \
: "memory"); \
} while (0)
/* Used for wdc.flush/clear which can use rB for offset which is not possible
* to use for simple wdc or wic.
*
* start address is cache aligned
* end address is not aligned, if end is aligned then I have to subtract
* cacheline length because I can't flush/invalidate the next cacheline.
* If is not, I align it because I will flush/invalidate whole line.
*/
#define CACHE_RANGE_LOOP_2(start, end, line_length, op) \
do { \
int step = -line_length; \
int align = ~(line_length - 1); \
int count; \
end = ((end & align) == end) ? end - line_length : end & align; \
count = end - start; \
WARN_ON(count < 0); \
\
__asm__ __volatile__ (" 1: " #op " %0, %1;" \
"bgtid %1, 1b;" \
"addk %1, %1, %2;" \
: : "r" (start), "r" (count), \
"r" (step) : "memory"); \
} while (0)
/* It is used only first parameter for OP - for wic, wdc */
#define CACHE_RANGE_LOOP_1(start, end, line_length, op) \
do { \
unsigned int volatile temp = 0; \
unsigned int align = ~(line_length - 1); \
end = ((end & align) == end) ? end - line_length : end & align; \
WARN_ON(end < start); \
\
__asm__ __volatile__ (" 1: " #op " %1, r0;" \
"cmpu %0, %1, %2;" \
"bgtid %0, 1b;" \
"addk %1, %1, %3;" \
: : "r" (temp), "r" (start), "r" (end), \
"r" (line_length) : "memory"); \
} while (0)
#define ASM_LOOP
static void __flush_icache_range_msr_irq(unsigned long start, unsigned long end)
{
unsigned long flags;
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
(unsigned int)start, (unsigned int) end);
CACHE_LOOP_LIMITS(start, end,
cpuinfo.icache_line_length, cpuinfo.icache_size);
local_irq_save(flags);
__disable_icache_msr();
#ifdef ASM_LOOP
CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
#else
for (i = start; i < end; i += cpuinfo.icache_line_length)
__asm__ __volatile__ ("wic %0, r0;" \
: : "r" (i));
#endif
__enable_icache_msr();
local_irq_restore(flags);
}
static void __flush_icache_range_nomsr_irq(unsigned long start,
unsigned long end)
{
unsigned long flags;
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
(unsigned int)start, (unsigned int) end);
CACHE_LOOP_LIMITS(start, end,
cpuinfo.icache_line_length, cpuinfo.icache_size);
local_irq_save(flags);
__disable_icache_nomsr();
#ifdef ASM_LOOP
CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
#else
for (i = start; i < end; i += cpuinfo.icache_line_length)
__asm__ __volatile__ ("wic %0, r0;" \
: : "r" (i));
#endif
__enable_icache_nomsr();
local_irq_restore(flags);
}
static void __flush_icache_range_noirq(unsigned long start,
unsigned long end)
{
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
(unsigned int)start, (unsigned int) end);
CACHE_LOOP_LIMITS(start, end,
cpuinfo.icache_line_length, cpuinfo.icache_size);
#ifdef ASM_LOOP
CACHE_RANGE_LOOP_1(start, end, cpuinfo.icache_line_length, wic);
#else
for (i = start; i < end; i += cpuinfo.icache_line_length)
__asm__ __volatile__ ("wic %0, r0;" \
: : "r" (i));
#endif
}
static void __flush_icache_all_msr_irq(void)
{
unsigned long flags;
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s\n", __func__);
local_irq_save(flags);
__disable_icache_msr();
#ifdef ASM_LOOP
CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
#else
for (i = 0; i < cpuinfo.icache_size;
i += cpuinfo.icache_line_length)
__asm__ __volatile__ ("wic %0, r0;" \
: : "r" (i));
#endif
__enable_icache_msr();
local_irq_restore(flags);
}
static void __flush_icache_all_nomsr_irq(void)
{
unsigned long flags;
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s\n", __func__);
local_irq_save(flags);
__disable_icache_nomsr();
#ifdef ASM_LOOP
CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
#else
for (i = 0; i < cpuinfo.icache_size;
i += cpuinfo.icache_line_length)
__asm__ __volatile__ ("wic %0, r0;" \
: : "r" (i));
#endif
__enable_icache_nomsr();
local_irq_restore(flags);
}
static void __flush_icache_all_noirq(void)
{
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s\n", __func__);
#ifdef ASM_LOOP
CACHE_ALL_LOOP(cpuinfo.icache_size, cpuinfo.icache_line_length, wic);
#else
for (i = 0; i < cpuinfo.icache_size;
i += cpuinfo.icache_line_length)
__asm__ __volatile__ ("wic %0, r0;" \
: : "r" (i));
#endif
}
static void __invalidate_dcache_all_msr_irq(void)
{
unsigned long flags;
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s\n", __func__);
local_irq_save(flags);
__disable_dcache_msr();
#ifdef ASM_LOOP
CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc);
#else
for (i = 0; i < cpuinfo.dcache_size;
i += cpuinfo.dcache_line_length)
__asm__ __volatile__ ("wdc %0, r0;" \
: : "r" (i));
#endif
__enable_dcache_msr();
local_irq_restore(flags);
}
static void __invalidate_dcache_all_nomsr_irq(void)
{
unsigned long flags;
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s\n", __func__);
local_irq_save(flags);
__disable_dcache_nomsr();
#ifdef ASM_LOOP
CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc);
#else
for (i = 0; i < cpuinfo.dcache_size;
i += cpuinfo.dcache_line_length)
__asm__ __volatile__ ("wdc %0, r0;" \
: : "r" (i));
#endif
__enable_dcache_nomsr();
local_irq_restore(flags);
}
static void __invalidate_dcache_all_noirq_wt(void)
{
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s\n", __func__);
#ifdef ASM_LOOP
CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length, wdc);
#else
for (i = 0; i < cpuinfo.dcache_size;
i += cpuinfo.dcache_line_length)
__asm__ __volatile__ ("wdc %0, r0;" \
: : "r" (i));
#endif
}
/*
* FIXME It is blindly invalidation as is expected
* but can't be called on noMMU in microblaze_cache_init below
*
* MS: noMMU kernel won't boot if simple wdc is used
* The reason should be that there are discared data which kernel needs
*/
static void __invalidate_dcache_all_wb(void)
{
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s\n", __func__);
#ifdef ASM_LOOP
CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length,
wdc);
#else
for (i = 0; i < cpuinfo.dcache_size;
i += cpuinfo.dcache_line_length)
__asm__ __volatile__ ("wdc %0, r0;" \
: : "r" (i));
#endif
}
static void __invalidate_dcache_range_wb(unsigned long start,
unsigned long end)
{
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
(unsigned int)start, (unsigned int) end);
CACHE_LOOP_LIMITS(start, end,
cpuinfo.dcache_line_length, cpuinfo.dcache_size);
#ifdef ASM_LOOP
CACHE_RANGE_LOOP_2(start, end, cpuinfo.dcache_line_length, wdc.clear);
#else
for (i = start; i < end; i += cpuinfo.dcache_line_length)
__asm__ __volatile__ ("wdc.clear %0, r0;" \
: : "r" (i));
#endif
}
static void __invalidate_dcache_range_nomsr_wt(unsigned long start,
unsigned long end)
{
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
(unsigned int)start, (unsigned int) end);
CACHE_LOOP_LIMITS(start, end,
cpuinfo.dcache_line_length, cpuinfo.dcache_size);
#ifdef ASM_LOOP
CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
#else
for (i = start; i < end; i += cpuinfo.dcache_line_length)
__asm__ __volatile__ ("wdc %0, r0;" \
: : "r" (i));
#endif
}
static void __invalidate_dcache_range_msr_irq_wt(unsigned long start,
unsigned long end)
{
unsigned long flags;
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
(unsigned int)start, (unsigned int) end);
CACHE_LOOP_LIMITS(start, end,
cpuinfo.dcache_line_length, cpuinfo.dcache_size);
local_irq_save(flags);
__disable_dcache_msr();
#ifdef ASM_LOOP
CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
#else
for (i = start; i < end; i += cpuinfo.dcache_line_length)
__asm__ __volatile__ ("wdc %0, r0;" \
: : "r" (i));
#endif
__enable_dcache_msr();
local_irq_restore(flags);
}
static void __invalidate_dcache_range_nomsr_irq(unsigned long start,
unsigned long end)
{
unsigned long flags;
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
(unsigned int)start, (unsigned int) end);
CACHE_LOOP_LIMITS(start, end,
cpuinfo.dcache_line_length, cpuinfo.dcache_size);
local_irq_save(flags);
__disable_dcache_nomsr();
#ifdef ASM_LOOP
CACHE_RANGE_LOOP_1(start, end, cpuinfo.dcache_line_length, wdc);
#else
for (i = start; i < end; i += cpuinfo.dcache_line_length)
__asm__ __volatile__ ("wdc %0, r0;" \
: : "r" (i));
#endif
__enable_dcache_nomsr();
local_irq_restore(flags);
}
static void __flush_dcache_all_wb(void)
{
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s\n", __func__);
#ifdef ASM_LOOP
CACHE_ALL_LOOP(cpuinfo.dcache_size, cpuinfo.dcache_line_length,
wdc.flush);
#else
for (i = 0; i < cpuinfo.dcache_size;
i += cpuinfo.dcache_line_length)
__asm__ __volatile__ ("wdc.flush %0, r0;" \
: : "r" (i));
#endif
}
static void __flush_dcache_range_wb(unsigned long start, unsigned long end)
{
#ifndef ASM_LOOP
int i;
#endif
pr_debug("%s: start 0x%x, end 0x%x\n", __func__,
(unsigned int)start, (unsigned int) end);
CACHE_LOOP_LIMITS(start, end,
cpuinfo.dcache_line_length, cpuinfo.dcache_size);
#ifdef ASM_LOOP
CACHE_RANGE_LOOP_2(start, end, cpuinfo.dcache_line_length, wdc.flush);
#else
for (i = start; i < end; i += cpuinfo.dcache_line_length)
__asm__ __volatile__ ("wdc.flush %0, r0;" \
: : "r" (i));
#endif
}
/* struct for wb caches and for wt caches */
struct scache *mbc;
/* new wb cache model */
static const struct scache wb_msr = {
.ie = __enable_icache_msr,
.id = __disable_icache_msr,
.ifl = __flush_icache_all_noirq,
.iflr = __flush_icache_range_noirq,
.iin = __flush_icache_all_noirq,
.iinr = __flush_icache_range_noirq,
.de = __enable_dcache_msr,
.dd = __disable_dcache_msr,
.dfl = __flush_dcache_all_wb,
.dflr = __flush_dcache_range_wb,
.din = __invalidate_dcache_all_wb,
.dinr = __invalidate_dcache_range_wb,
};
/* There is only difference in ie, id, de, dd functions */
static const struct scache wb_nomsr = {
.ie = __enable_icache_nomsr,
.id = __disable_icache_nomsr,
.ifl = __flush_icache_all_noirq,
.iflr = __flush_icache_range_noirq,
.iin = __flush_icache_all_noirq,
.iinr = __flush_icache_range_noirq,
.de = __enable_dcache_nomsr,
.dd = __disable_dcache_nomsr,
.dfl = __flush_dcache_all_wb,
.dflr = __flush_dcache_range_wb,
.din = __invalidate_dcache_all_wb,
.dinr = __invalidate_dcache_range_wb,
};
/* Old wt cache model with disabling irq and turn off cache */
static const struct scache wt_msr = {
.ie = __enable_icache_msr,
.id = __disable_icache_msr,
.ifl = __flush_icache_all_msr_irq,
.iflr = __flush_icache_range_msr_irq,
.iin = __flush_icache_all_msr_irq,
.iinr = __flush_icache_range_msr_irq,
.de = __enable_dcache_msr,
.dd = __disable_dcache_msr,
.dfl = __invalidate_dcache_all_msr_irq,
.dflr = __invalidate_dcache_range_msr_irq_wt,
.din = __invalidate_dcache_all_msr_irq,
.dinr = __invalidate_dcache_range_msr_irq_wt,
};
static const struct scache wt_nomsr = {
.ie = __enable_icache_nomsr,
.id = __disable_icache_nomsr,
.ifl = __flush_icache_all_nomsr_irq,
.iflr = __flush_icache_range_nomsr_irq,
.iin = __flush_icache_all_nomsr_irq,
.iinr = __flush_icache_range_nomsr_irq,
.de = __enable_dcache_nomsr,
.dd = __disable_dcache_nomsr,
.dfl = __invalidate_dcache_all_nomsr_irq,
.dflr = __invalidate_dcache_range_nomsr_irq,
.din = __invalidate_dcache_all_nomsr_irq,
.dinr = __invalidate_dcache_range_nomsr_irq,
};
/* New wt cache model for newer Microblaze versions */
static const struct scache wt_msr_noirq = {
.ie = __enable_icache_msr,
.id = __disable_icache_msr,
.ifl = __flush_icache_all_noirq,
.iflr = __flush_icache_range_noirq,
.iin = __flush_icache_all_noirq,
.iinr = __flush_icache_range_noirq,
.de = __enable_dcache_msr,
.dd = __disable_dcache_msr,
.dfl = __invalidate_dcache_all_noirq_wt,
.dflr = __invalidate_dcache_range_nomsr_wt,
.din = __invalidate_dcache_all_noirq_wt,
.dinr = __invalidate_dcache_range_nomsr_wt,
};
static const struct scache wt_nomsr_noirq = {
.ie = __enable_icache_nomsr,
.id = __disable_icache_nomsr,
.ifl = __flush_icache_all_noirq,
.iflr = __flush_icache_range_noirq,
.iin = __flush_icache_all_noirq,
.iinr = __flush_icache_range_noirq,
.de = __enable_dcache_nomsr,
.dd = __disable_dcache_nomsr,
.dfl = __invalidate_dcache_all_noirq_wt,
.dflr = __invalidate_dcache_range_nomsr_wt,
.din = __invalidate_dcache_all_noirq_wt,
.dinr = __invalidate_dcache_range_nomsr_wt,
};
/* CPU version code for 7.20.c - see arch/microblaze/kernel/cpu/cpuinfo.c */
#define CPUVER_7_20_A 0x0c
#define CPUVER_7_20_D 0x0f
void microblaze_cache_init(void)
{
if (cpuinfo.use_instr & PVR2_USE_MSR_INSTR) {
if (cpuinfo.dcache_wb) {
pr_info("wb_msr\n");
mbc = (struct scache *)&wb_msr;
if (cpuinfo.ver_code <= CPUVER_7_20_D) {
/* MS: problem with signal handling - hw bug */
pr_info("WB won't work properly\n");
}
} else {
if (cpuinfo.ver_code >= CPUVER_7_20_A) {
pr_info("wt_msr_noirq\n");
mbc = (struct scache *)&wt_msr_noirq;
} else {
pr_info("wt_msr\n");
mbc = (struct scache *)&wt_msr;
}
}
} else {
if (cpuinfo.dcache_wb) {
pr_info("wb_nomsr\n");
mbc = (struct scache *)&wb_nomsr;
if (cpuinfo.ver_code <= CPUVER_7_20_D) {
/* MS: problem with signal handling - hw bug */
pr_info("WB won't work properly\n");
}
} else {
if (cpuinfo.ver_code >= CPUVER_7_20_A) {
pr_info("wt_nomsr_noirq\n");
mbc = (struct scache *)&wt_nomsr_noirq;
} else {
pr_info("wt_nomsr\n");
mbc = (struct scache *)&wt_nomsr;
}
}
}
/*
* FIXME Invalidation is done in U-BOOT
* WT cache: Data is already written to main memory
* WB cache: Discard data on noMMU which caused that kernel doesn't boot
*/
/* invalidate_dcache(); */
enable_dcache();
invalidate_icache();
enable_icache();
}