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Diffstat (limited to 'arch/arc/mm/cache_arc700.c')
-rw-r--r--arch/arc/mm/cache_arc700.c126
1 files changed, 72 insertions, 54 deletions
diff --git a/arch/arc/mm/cache_arc700.c b/arch/arc/mm/cache_arc700.c
index aedce1905441c..f415d851b7658 100644
--- a/arch/arc/mm/cache_arc700.c
+++ b/arch/arc/mm/cache_arc700.c
@@ -73,6 +73,33 @@
#include <asm/cachectl.h>
#include <asm/setup.h>
+/* Instruction cache related Auxiliary registers */
+#define ARC_REG_IC_BCR 0x77 /* Build Config reg */
+#define ARC_REG_IC_IVIC 0x10
+#define ARC_REG_IC_CTRL 0x11
+#define ARC_REG_IC_IVIL 0x19
+#if (CONFIG_ARC_MMU_VER > 2)
+#define ARC_REG_IC_PTAG 0x1E
+#endif
+
+/* Bit val in IC_CTRL */
+#define IC_CTRL_CACHE_DISABLE 0x1
+
+/* Data cache related Auxiliary registers */
+#define ARC_REG_DC_BCR 0x72 /* Build Config reg */
+#define ARC_REG_DC_IVDC 0x47
+#define ARC_REG_DC_CTRL 0x48
+#define ARC_REG_DC_IVDL 0x4A
+#define ARC_REG_DC_FLSH 0x4B
+#define ARC_REG_DC_FLDL 0x4C
+#if (CONFIG_ARC_MMU_VER > 2)
+#define ARC_REG_DC_PTAG 0x5C
+#endif
+
+/* Bit val in DC_CTRL */
+#define DC_CTRL_INV_MODE_FLUSH 0x40
+#define DC_CTRL_FLUSH_STATUS 0x100
+
char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len)
{
int n = 0;
@@ -89,8 +116,10 @@ char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len)
enb ? "" : "DISABLED (kernel-build)"); \
}
- PR_CACHE(&cpuinfo_arc700[c].icache, __CONFIG_ARC_HAS_ICACHE, "I-Cache");
- PR_CACHE(&cpuinfo_arc700[c].dcache, __CONFIG_ARC_HAS_DCACHE, "D-Cache");
+ PR_CACHE(&cpuinfo_arc700[c].icache, IS_ENABLED(CONFIG_ARC_HAS_ICACHE),
+ "I-Cache");
+ PR_CACHE(&cpuinfo_arc700[c].dcache, IS_ENABLED(CONFIG_ARC_HAS_DCACHE),
+ "D-Cache");
return buf;
}
@@ -100,17 +129,23 @@ char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len)
* the cpuinfo structure for later use.
* No Validation done here, simply read/convert the BCRs
*/
-void __cpuinit read_decode_cache_bcr(void)
+void read_decode_cache_bcr(void)
{
- struct bcr_cache ibcr, dbcr;
struct cpuinfo_arc_cache *p_ic, *p_dc;
unsigned int cpu = smp_processor_id();
+ struct bcr_cache {
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ unsigned int pad:12, line_len:4, sz:4, config:4, ver:8;
+#else
+ unsigned int ver:8, config:4, sz:4, line_len:4, pad:12;
+#endif
+ } ibcr, dbcr;
p_ic = &cpuinfo_arc700[cpu].icache;
READ_BCR(ARC_REG_IC_BCR, ibcr);
- if (ibcr.config == 0x3)
- p_ic->assoc = 2;
+ BUG_ON(ibcr.config != 3);
+ p_ic->assoc = 2; /* Fixed to 2w set assoc */
p_ic->line_len = 8 << ibcr.line_len;
p_ic->sz = 0x200 << ibcr.sz;
p_ic->ver = ibcr.ver;
@@ -118,8 +153,8 @@ void __cpuinit read_decode_cache_bcr(void)
p_dc = &cpuinfo_arc700[cpu].dcache;
READ_BCR(ARC_REG_DC_BCR, dbcr);
- if (dbcr.config == 0x2)
- p_dc->assoc = 4;
+ BUG_ON(dbcr.config != 2);
+ p_dc->assoc = 4; /* Fixed to 4w set assoc */
p_dc->line_len = 16 << dbcr.line_len;
p_dc->sz = 0x200 << dbcr.sz;
p_dc->ver = dbcr.ver;
@@ -132,14 +167,12 @@ void __cpuinit read_decode_cache_bcr(void)
* 3. Enable the Caches, setup default flush mode for D-Cache
* 3. Calculate the SHMLBA used by user space
*/
-void __cpuinit arc_cache_init(void)
+void arc_cache_init(void)
{
- unsigned int temp;
unsigned int cpu = smp_processor_id();
struct cpuinfo_arc_cache *ic = &cpuinfo_arc700[cpu].icache;
struct cpuinfo_arc_cache *dc = &cpuinfo_arc700[cpu].dcache;
- int way_pg_ratio = way_pg_ratio;
- int dcache_does_alias;
+ unsigned int dcache_does_alias, temp;
char str[256];
printk(arc_cache_mumbojumbo(0, str, sizeof(str)));
@@ -149,20 +182,11 @@ void __cpuinit arc_cache_init(void)
#ifdef CONFIG_ARC_HAS_ICACHE
/* 1. Confirm some of I-cache params which Linux assumes */
- if ((ic->assoc != ARC_ICACHE_WAYS) ||
- (ic->line_len != ARC_ICACHE_LINE_LEN)) {
+ if (ic->line_len != ARC_ICACHE_LINE_LEN)
panic("Cache H/W doesn't match kernel Config");
- }
-#if (CONFIG_ARC_MMU_VER > 2)
- if (ic->ver != 3) {
- if (running_on_hw)
- panic("Cache ver doesn't match MMU ver\n");
-
- /* For ISS - suggest the toggles to use */
- pr_err("Use -prop=icache_version=3,-prop=dcache_version=3\n");
- }
-#endif
+ if (ic->ver != CONFIG_ARC_MMU_VER)
+ panic("Cache ver doesn't match MMU ver\n");
#endif
/* Enable/disable I-Cache */
@@ -181,14 +205,12 @@ chk_dc:
return;
#ifdef CONFIG_ARC_HAS_DCACHE
- if ((dc->assoc != ARC_DCACHE_WAYS) ||
- (dc->line_len != ARC_DCACHE_LINE_LEN)) {
+ if (dc->line_len != ARC_DCACHE_LINE_LEN)
panic("Cache H/W doesn't match kernel Config");
- }
-
- dcache_does_alias = (dc->sz / ARC_DCACHE_WAYS) > PAGE_SIZE;
/* check for D-Cache aliasing */
+ dcache_does_alias = (dc->sz / dc->assoc) > PAGE_SIZE;
+
if (dcache_does_alias && !cache_is_vipt_aliasing())
panic("Enable CONFIG_ARC_CACHE_VIPT_ALIASING\n");
else if (!dcache_does_alias && cache_is_vipt_aliasing())
@@ -239,11 +261,9 @@ static inline void wait_for_flush(void)
*/
static inline void __dc_entire_op(const int cacheop)
{
- unsigned long flags, tmp = tmp;
+ unsigned int tmp = tmp;
int aux;
- local_irq_save(flags);
-
if (cacheop == OP_FLUSH_N_INV) {
/* Dcache provides 2 cmd: FLUSH or INV
* INV inturn has sub-modes: DISCARD or FLUSH-BEFORE
@@ -267,8 +287,6 @@ static inline void __dc_entire_op(const int cacheop)
/* Switch back the DISCARD ONLY Invalidate mode */
if (cacheop == OP_FLUSH_N_INV)
write_aux_reg(ARC_REG_DC_CTRL, tmp & ~DC_CTRL_INV_MODE_FLUSH);
-
- local_irq_restore(flags);
}
/*
@@ -459,8 +477,15 @@ static void __ic_line_inv_vaddr(unsigned long paddr, unsigned long vaddr,
local_irq_restore(flags);
}
+static inline void __ic_entire_inv(void)
+{
+ write_aux_reg(ARC_REG_IC_IVIC, 1);
+ read_aux_reg(ARC_REG_IC_CTRL); /* blocks */
+}
+
#else
+#define __ic_entire_inv()
#define __ic_line_inv_vaddr(pstart, vstart, sz)
#endif /* CONFIG_ARC_HAS_ICACHE */
@@ -487,7 +512,7 @@ void flush_dcache_page(struct page *page)
struct address_space *mapping;
if (!cache_is_vipt_aliasing()) {
- set_bit(PG_arch_1, &page->flags);
+ clear_bit(PG_dc_clean, &page->flags);
return;
}
@@ -501,7 +526,7 @@ void flush_dcache_page(struct page *page)
* Make a note that K-mapping is dirty
*/
if (!mapping_mapped(mapping)) {
- set_bit(PG_arch_1, &page->flags);
+ clear_bit(PG_dc_clean, &page->flags);
} else if (page_mapped(page)) {
/* kernel reading from page with U-mapping */
@@ -629,26 +654,13 @@ void ___flush_dcache_page(unsigned long paddr, unsigned long vaddr)
__dc_line_op(paddr, vaddr & PAGE_MASK, PAGE_SIZE, OP_FLUSH_N_INV);
}
-void flush_icache_all(void)
-{
- unsigned long flags;
-
- local_irq_save(flags);
-
- write_aux_reg(ARC_REG_IC_IVIC, 1);
-
- /* lr will not complete till the icache inv operation is not over */
- read_aux_reg(ARC_REG_IC_CTRL);
- local_irq_restore(flags);
-}
-
noinline void flush_cache_all(void)
{
unsigned long flags;
local_irq_save(flags);
- flush_icache_all();
+ __ic_entire_inv();
__dc_entire_op(OP_FLUSH_N_INV);
local_irq_restore(flags);
@@ -667,7 +679,12 @@ void flush_cache_page(struct vm_area_struct *vma, unsigned long u_vaddr,
{
unsigned int paddr = pfn << PAGE_SHIFT;
- __sync_icache_dcache(paddr, u_vaddr, PAGE_SIZE);
+ u_vaddr &= PAGE_MASK;
+
+ ___flush_dcache_page(paddr, u_vaddr);
+
+ if (vma->vm_flags & VM_EXEC)
+ __inv_icache_page(paddr, u_vaddr);
}
void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
@@ -717,7 +734,7 @@ void copy_user_highpage(struct page *to, struct page *from,
* non copied user pages (e.g. read faults which wire in pagecache page
* directly).
*/
- set_bit(PG_arch_1, &to->flags);
+ clear_bit(PG_dc_clean, &to->flags);
/*
* if SRC was already usermapped and non-congruent to kernel mapping
@@ -725,15 +742,16 @@ void copy_user_highpage(struct page *to, struct page *from,
*/
if (clean_src_k_mappings) {
__flush_dcache_page(kfrom, kfrom);
+ set_bit(PG_dc_clean, &from->flags);
} else {
- set_bit(PG_arch_1, &from->flags);
+ clear_bit(PG_dc_clean, &from->flags);
}
}
void clear_user_page(void *to, unsigned long u_vaddr, struct page *page)
{
clear_page(to);
- set_bit(PG_arch_1, &page->flags);
+ clear_bit(PG_dc_clean, &page->flags);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-17 13:35:15 +0000