#include <asm/cache.h>
/* Bit values in IC_CTRL */
-#define IC_CTRL_CACHE_DISABLE (1 << 0)
+#define IC_CTRL_CACHE_DISABLE BIT(0)
/* Bit values in DC_CTRL */
-#define DC_CTRL_CACHE_DISABLE (1 << 0)
-#define DC_CTRL_INV_MODE_FLUSH (1 << 6)
-#define DC_CTRL_FLUSH_STATUS (1 << 8)
+#define DC_CTRL_CACHE_DISABLE BIT(0)
+#define DC_CTRL_INV_MODE_FLUSH BIT(6)
+#define DC_CTRL_FLUSH_STATUS BIT(8)
#define CACHE_VER_NUM_MASK 0xF
-#define SLC_CTRL_SB (1 << 2)
#define OP_INV 0x1
#define OP_FLUSH 0x2
#define OP_INV_IC 0x3
+/* Bit val in SLC_CONTROL */
+#define SLC_CTRL_DIS 0x001
+#define SLC_CTRL_IM 0x040
+#define SLC_CTRL_BUSY 0x100
+#define SLC_CTRL_RGN_OP_INV 0x200
+
/*
* By default that variable will fall into .bss section.
* But .bss section is not relocated and so it will be initilized before
* relocation but will be used after being zeroed.
*/
int l1_line_sz __section(".data");
-int dcache_exists __section(".data");
-int icache_exists __section(".data");
+bool dcache_exists __section(".data") = false;
+bool icache_exists __section(".data") = false;
#define CACHE_LINE_MASK (~(l1_line_sz - 1))
#ifdef CONFIG_ISA_ARCV2
int slc_line_sz __section(".data");
-int slc_exists __section(".data");
-int ioc_exists __section(".data");
+bool slc_exists __section(".data") = false;
+bool ioc_exists __section(".data") = false;
+bool pae_exists __section(".data") = false;
+
+/* To force enable IOC set ioc_enable to 'true' */
+bool ioc_enable __section(".data") = false;
-static unsigned int __before_slc_op(const int op)
+void read_decode_mmu_bcr(void)
{
- unsigned int reg = reg;
+ /* TODO: should we compare mmu version from BCR and from CONFIG? */
+#if (CONFIG_ARC_MMU_VER >= 4)
+ u32 tmp;
- if (op == OP_INV) {
- /*
- * IM is set by default and implies Flush-n-inv
- * Clear it here for vanilla inv
- */
- reg = read_aux_reg(ARC_AUX_SLC_CTRL);
- write_aux_reg(ARC_AUX_SLC_CTRL, reg & ~DC_CTRL_INV_MODE_FLUSH);
- }
+ tmp = read_aux_reg(ARC_AUX_MMU_BCR);
- return reg;
-}
+ struct bcr_mmu_4 {
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ unsigned int ver:8, sasid:1, sz1:4, sz0:4, res:2, pae:1,
+ n_ways:2, n_entry:2, n_super:2, u_itlb:3, u_dtlb:3;
+#else
+ /* DTLB ITLB JES JE JA */
+ unsigned int u_dtlb:3, u_itlb:3, n_super:2, n_entry:2, n_ways:2,
+ pae:1, res:2, sz0:4, sz1:4, sasid:1, ver:8;
+#endif /* CONFIG_CPU_BIG_ENDIAN */
+ } *mmu4;
-static void __after_slc_op(const int op, unsigned int reg)
-{
- if (op & OP_FLUSH) { /* flush / flush-n-inv both wait */
- /*
- * Make sure "busy" bit reports correct status,
- * see STAR 9001165532
- */
- read_aux_reg(ARC_AUX_SLC_CTRL);
- while (read_aux_reg(ARC_AUX_SLC_CTRL) &
- DC_CTRL_FLUSH_STATUS)
- ;
- }
+ mmu4 = (struct bcr_mmu_4 *)&tmp;
- /* Switch back to default Invalidate mode */
- if (op == OP_INV)
- write_aux_reg(ARC_AUX_SLC_CTRL, reg | DC_CTRL_INV_MODE_FLUSH);
+ pae_exists = !!mmu4->pae;
+#endif /* (CONFIG_ARC_MMU_VER >= 4) */
}
-static inline void __slc_line_loop(unsigned long paddr, unsigned long sz,
- const int op)
+static void __slc_entire_op(const int op)
{
- unsigned int aux_cmd;
- int num_lines;
+ unsigned int ctrl;
-#define SLC_LINE_MASK (~(slc_line_sz - 1))
+ ctrl = read_aux_reg(ARC_AUX_SLC_CTRL);
- aux_cmd = op & OP_INV ? ARC_AUX_SLC_IVDL : ARC_AUX_SLC_FLDL;
+ if (!(op & OP_FLUSH)) /* i.e. OP_INV */
+ ctrl &= ~SLC_CTRL_IM; /* clear IM: Disable flush before Inv */
+ else
+ ctrl |= SLC_CTRL_IM;
- sz += paddr & ~SLC_LINE_MASK;
- paddr &= SLC_LINE_MASK;
+ write_aux_reg(ARC_AUX_SLC_CTRL, ctrl);
- num_lines = DIV_ROUND_UP(sz, slc_line_sz);
+ if (op & OP_INV) /* Inv or flush-n-inv use same cmd reg */
+ write_aux_reg(ARC_AUX_SLC_INVALIDATE, 0x1);
+ else
+ write_aux_reg(ARC_AUX_SLC_FLUSH, 0x1);
- while (num_lines-- > 0) {
- write_aux_reg(aux_cmd, paddr);
- paddr += slc_line_sz;
- }
+ /* Make sure "busy" bit reports correct stataus, see STAR 9001165532 */
+ read_aux_reg(ARC_AUX_SLC_CTRL);
+
+ /* Important to wait for flush to complete */
+ while (read_aux_reg(ARC_AUX_SLC_CTRL) & SLC_CTRL_BUSY);
}
-static inline void __slc_entire_op(const int cacheop)
+static void slc_upper_region_init(void)
{
- int aux;
- unsigned int ctrl_reg = __before_slc_op(cacheop);
+ /*
+ * ARC_AUX_SLC_RGN_END1 and ARC_AUX_SLC_RGN_START1 are always == 0
+ * as we don't use PAE40.
+ */
+ write_aux_reg(ARC_AUX_SLC_RGN_END1, 0);
+ write_aux_reg(ARC_AUX_SLC_RGN_START1, 0);
+}
- if (cacheop & OP_INV) /* Inv or flush-n-inv use same cmd reg */
- aux = ARC_AUX_SLC_INVALIDATE;
+static void __slc_rgn_op(unsigned long paddr, unsigned long sz, const int op)
+{
+ unsigned int ctrl;
+ unsigned long end;
+
+ /*
+ * The Region Flush operation is specified by CTRL.RGN_OP[11..9]
+ * - b'000 (default) is Flush,
+ * - b'001 is Invalidate if CTRL.IM == 0
+ * - b'001 is Flush-n-Invalidate if CTRL.IM == 1
+ */
+ ctrl = read_aux_reg(ARC_AUX_SLC_CTRL);
+
+ /* Don't rely on default value of IM bit */
+ if (!(op & OP_FLUSH)) /* i.e. OP_INV */
+ ctrl &= ~SLC_CTRL_IM; /* clear IM: Disable flush before Inv */
else
- aux = ARC_AUX_SLC_FLUSH;
+ ctrl |= SLC_CTRL_IM;
- write_aux_reg(aux, 0x1);
+ if (op & OP_INV)
+ ctrl |= SLC_CTRL_RGN_OP_INV; /* Inv or flush-n-inv */
+ else
+ ctrl &= ~SLC_CTRL_RGN_OP_INV;
- __after_slc_op(cacheop, ctrl_reg);
-}
+ write_aux_reg(ARC_AUX_SLC_CTRL, ctrl);
-static inline void __slc_line_op(unsigned long paddr, unsigned long sz,
- const int cacheop)
-{
- unsigned int ctrl_reg = __before_slc_op(cacheop);
- __slc_line_loop(paddr, sz, cacheop);
- __after_slc_op(cacheop, ctrl_reg);
+ /*
+ * Lower bits are ignored, no need to clip
+ * END needs to be setup before START (latter triggers the operation)
+ * END can't be same as START, so add (l2_line_sz - 1) to sz
+ */
+ end = paddr + sz + slc_line_sz - 1;
+
+ /*
+ * Upper addresses (ARC_AUX_SLC_RGN_END1 and ARC_AUX_SLC_RGN_START1)
+ * are always == 0 as we don't use PAE40, so we only setup lower ones
+ * (ARC_AUX_SLC_RGN_END and ARC_AUX_SLC_RGN_START)
+ */
+ write_aux_reg(ARC_AUX_SLC_RGN_END, end);
+ write_aux_reg(ARC_AUX_SLC_RGN_START, paddr);
+
+ /* Make sure "busy" bit reports correct stataus, see STAR 9001165532 */
+ read_aux_reg(ARC_AUX_SLC_CTRL);
+
+ while (read_aux_reg(ARC_AUX_SLC_CTRL) & SLC_CTRL_BUSY);
}
-#else
-#define __slc_entire_op(cacheop)
-#define __slc_line_op(paddr, sz, cacheop)
-#endif
+#endif /* CONFIG_ISA_ARCV2 */
#ifdef CONFIG_ISA_ARCV2
static void read_decode_cache_bcr_arcv2(void)
sbcr.word = read_aux_reg(ARC_BCR_SLC);
if (sbcr.fields.ver) {
slc_cfg.word = read_aux_reg(ARC_AUX_SLC_CONFIG);
- slc_exists = 1;
+ slc_exists = true;
slc_line_sz = (slc_cfg.fields.lsz == 0) ? 128 : 64;
}
} cbcr;
cbcr.word = read_aux_reg(ARC_BCR_CLUSTER);
- if (cbcr.fields.c)
- ioc_exists = 1;
+ if (cbcr.fields.c && ioc_enable)
+ ioc_exists = true;
}
#endif
ibcr.word = read_aux_reg(ARC_BCR_IC_BUILD);
if (ibcr.fields.ver) {
- icache_exists = 1;
+ icache_exists = true;
l1_line_sz = ic_line_sz = 8 << ibcr.fields.line_len;
if (!ic_line_sz)
panic("Instruction exists but line length is 0\n");
}
dbcr.word = read_aux_reg(ARC_BCR_DC_BUILD);
- if (dbcr.fields.ver){
- dcache_exists = 1;
+ if (dbcr.fields.ver) {
+ dcache_exists = true;
l1_line_sz = dc_line_sz = 16 << dbcr.fields.line_len;
if (!dc_line_sz)
panic("Data cache exists but line length is 0\n");
* so setting 0x11 implies 512M, 0x12 implies 1G...
*/
write_aux_reg(ARC_AUX_IO_COH_AP0_SIZE,
- order_base_2(ap_size/1024) - 2);
-
+ order_base_2(ap_size / 1024) - 2);
/* IOC Aperture start must be aligned to the size of the aperture */
if (ap_base % ap_size != 0)
write_aux_reg(ARC_AUX_IO_COH_AP0_BASE, ap_base >> 12);
write_aux_reg(ARC_AUX_IO_COH_PARTIAL, 1);
write_aux_reg(ARC_AUX_IO_COH_ENABLE, 1);
-
}
-#endif
+
+ read_decode_mmu_bcr();
+
+ /*
+ * ARC_AUX_SLC_RGN_START1 and ARC_AUX_SLC_RGN_END1 register exist
+ * only if PAE exists in current HW. So we had to check pae_exist
+ * before using them.
+ */
+ if (slc_exists && pae_exists)
+ slc_upper_region_init();
+#endif /* CONFIG_ISA_ARCV2 */
}
int icache_status(void)
IC_CTRL_CACHE_DISABLE);
}
-#ifndef CONFIG_SYS_DCACHE_OFF
void invalidate_icache_all(void)
{
/* Any write to IC_IVIC register triggers invalidation of entire I$ */
if (icache_status()) {
write_aux_reg(ARC_AUX_IC_IVIC, 1);
+ /*
+ * As per ARC HS databook (see chapter 5.3.3.2)
+ * it is required to add 3 NOPs after each write to IC_IVIC.
+ */
+ __builtin_arc_nop();
+ __builtin_arc_nop();
+ __builtin_arc_nop();
read_aux_reg(ARC_AUX_IC_CTRL); /* blocks */
}
-}
-#else
-void invalidate_icache_all(void)
-{
-}
+
+#ifdef CONFIG_ISA_ARCV2
+ if (slc_exists)
+ __slc_entire_op(OP_INV);
#endif
+}
int dcache_status(void)
{
static void __after_dc_op(const int op, unsigned int reg)
{
if (op & OP_FLUSH) /* flush / flush-n-inv both wait */
- while (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_FLUSH_STATUS)
- ;
+ while (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_FLUSH_STATUS);
/* Switch back to default Invalidate mode */
if (op == OP_INV)
const int cacheop)
{
unsigned int ctrl_reg = __before_dc_op(cacheop);
+
__cache_line_loop(paddr, sz, cacheop);
__after_dc_op(cacheop, ctrl_reg);
}
void invalidate_dcache_range(unsigned long start, unsigned long end)
{
+ if (start >= end)
+ return;
+
#ifdef CONFIG_ISA_ARCV2
if (!ioc_exists)
#endif
#ifdef CONFIG_ISA_ARCV2
if (slc_exists && !ioc_exists)
- __slc_line_op(start, end - start, OP_INV);
+ __slc_rgn_op(start, end - start, OP_INV);
#endif
}
void flush_dcache_range(unsigned long start, unsigned long end)
{
+ if (start >= end)
+ return;
+
#ifdef CONFIG_ISA_ARCV2
if (!ioc_exists)
#endif
#ifdef CONFIG_ISA_ARCV2
if (slc_exists && !ioc_exists)
- __slc_line_op(start, end - start, OP_FLUSH);
+ __slc_rgn_op(start, end - start, OP_FLUSH);
#endif
}
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