#include <linux/kernel.h>
#include <linux/log2.h>
#include <asm/arcregs.h>
+#include <asm/arc-bcr.h>
#include <asm/cache.h>
+/*
+ * [ NOTE 1 ]:
+ * Data cache (L1 D$ or SL$) entire invalidate operation or data cache disable
+ * operation may result in unexpected behavior and data loss even if we flush
+ * data cache right before invalidation. That may happens if we store any context
+ * on stack (like we store BLINK register on stack before function call).
+ * BLINK register is the register where return address is automatically saved
+ * when we do function call with instructions like 'bl'.
+ *
+ * There is the real example:
+ * We may hang in the next code as we store any BLINK register on stack in
+ * invalidate_dcache_all() function.
+ *
+ * void flush_dcache_all() {
+ * __dc_entire_op(OP_FLUSH);
+ * // Other code //
+ * }
+ *
+ * void invalidate_dcache_all() {
+ * __dc_entire_op(OP_INV);
+ * // Other code //
+ * }
+ *
+ * void foo(void) {
+ * flush_dcache_all();
+ * invalidate_dcache_all();
+ * }
+ *
+ * Now let's see what really happens during that code execution:
+ *
+ * foo()
+ * |->> call flush_dcache_all
+ * [return address is saved to BLINK register]
+ * [push BLINK] (save to stack) ![point 1]
+ * |->> call __dc_entire_op(OP_FLUSH)
+ * [return address is saved to BLINK register]
+ * [flush L1 D$]
+ * return [jump to BLINK]
+ * <<------
+ * [other flush_dcache_all code]
+ * [pop BLINK] (get from stack)
+ * return [jump to BLINK]
+ * <<------
+ * |->> call invalidate_dcache_all
+ * [return address is saved to BLINK register]
+ * [push BLINK] (save to stack) ![point 2]
+ * |->> call __dc_entire_op(OP_FLUSH)
+ * [return address is saved to BLINK register]
+ * [invalidate L1 D$] ![point 3]
+ * // Oops!!!
+ * // We lose return address from invalidate_dcache_all function:
+ * // we save it to stack and invalidate L1 D$ after that!
+ * return [jump to BLINK]
+ * <<------
+ * [other invalidate_dcache_all code]
+ * [pop BLINK] (get from stack)
+ * // we don't have this data in L1 dcache as we invalidated it in [point 3]
+ * // so we get it from next memory level (for example DDR memory)
+ * // but in the memory we have value which we save in [point 1], which
+ * // is return address from flush_dcache_all function (instead of
+ * // address from current invalidate_dcache_all function which we
+ * // saved in [point 2] !)
+ * return [jump to BLINK]
+ * <<------
+ * // As BLINK points to invalidate_dcache_all, we call it again and
+ * // loop forever.
+ *
+ * Fortunately we may fix that by using flush & invalidation of D$ with a single
+ * one instruction (instead of flush and invalidation instructions pair) and
+ * enabling force function inline with '__attribute__((always_inline))' gcc
+ * attribute to avoid any function call (and BLINK store) between cache flush
+ * and disable.
+ *
+ *
+ * [ NOTE 2 ]:
+ * As of today we only support the following cache configurations on ARC.
+ * Other configurations may exist in HW (for example, since version 3.0 HS
+ * supports SL$ (L2 system level cache) disable) but we don't support it in SW.
+ * Configuration 1:
+ * ______________________
+ * | |
+ * | ARC CPU |
+ * |______________________|
+ * ___|___ ___|___
+ * | | | |
+ * | L1 I$ | | L1 D$ |
+ * |_______| |_______|
+ * on/off on/off
+ * ___|______________|____
+ * | |
+ * | main memory |
+ * |______________________|
+ *
+ * Configuration 2:
+ * ______________________
+ * | |
+ * | ARC CPU |
+ * |______________________|
+ * ___|___ ___|___
+ * | | | |
+ * | L1 I$ | | L1 D$ |
+ * |_______| |_______|
+ * on/off on/off
+ * ___|______________|____
+ * | |
+ * | L2 (SL$) |
+ * |______________________|
+ * always must be on
+ * ___|______________|____
+ * | |
+ * | main memory |
+ * |______________________|
+ *
+ * Configuration 3:
+ * ______________________
+ * | |
+ * | ARC CPU |
+ * |______________________|
+ * ___|___ ___|___
+ * | | | |
+ * | L1 I$ | | L1 D$ |
+ * |_______| |_______|
+ * on/off must be on
+ * ___|______________|____ _______
+ * | | | |
+ * | L2 (SL$) |-----| IOC |
+ * |______________________| |_______|
+ * always must be on on/off
+ * ___|______________|____
+ * | |
+ * | main memory |
+ * |______________________|
+ */
+
+DECLARE_GLOBAL_DATA_PTR;
+
/* Bit values in IC_CTRL */
#define IC_CTRL_CACHE_DISABLE BIT(0)
#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 OP_INV 0x1
-#define OP_FLUSH 0x2
-#define OP_INV_IC 0x3
+#define OP_INV BIT(0)
+#define OP_FLUSH BIT(1)
+#define OP_FLUSH_N_INV (OP_FLUSH | OP_INV)
/* Bit val in SLC_CONTROL */
#define SLC_CTRL_DIS 0x001
#define SLC_CTRL_BUSY 0x100
#define SLC_CTRL_RGN_OP_INV 0x200
+#define CACHE_LINE_MASK (~(gd->arch.l1_line_sz - 1))
+
/*
- * 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.
+ * We don't want to use '__always_inline' macro here as it can be redefined
+ * to simple 'inline' in some cases which breaks stuff. See [ NOTE 1 ] for more
+ * details about the reasons we need to use always_inline functions.
*/
-int l1_line_sz __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");
-bool slc_exists __section(".data") = false;
-bool ioc_exists __section(".data") = false;
-bool pae_exists __section(".data") = false;
+#define inlined_cachefunc inline __attribute__((always_inline))
-/* To force enable IOC set ioc_enable to 'true' */
-bool ioc_enable __section(".data") = false;
+static inlined_cachefunc void __ic_entire_invalidate(void);
+static inlined_cachefunc void __dc_entire_op(const int cacheop);
-void read_decode_mmu_bcr(void)
+static inline bool pae_exists(void)
{
/* TODO: should we compare mmu version from BCR and from CONFIG? */
#if (CONFIG_ARC_MMU_VER >= 4)
- u32 tmp;
+ union bcr_mmu_4 mmu4;
- tmp = read_aux_reg(ARC_AUX_MMU_BCR);
+ mmu4.word = read_aux_reg(ARC_AUX_MMU_BCR);
- 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;
+ if (mmu4.fields.pae)
+ return true;
+#endif /* (CONFIG_ARC_MMU_VER >= 4) */
- mmu4 = (struct bcr_mmu_4 *)&tmp;
+ return false;
+}
- pae_exists = !!mmu4->pae;
-#endif /* (CONFIG_ARC_MMU_VER >= 4) */
+static inlined_cachefunc bool icache_exists(void)
+{
+ union bcr_di_cache ibcr;
+
+ ibcr.word = read_aux_reg(ARC_BCR_IC_BUILD);
+ return !!ibcr.fields.ver;
}
-static void __slc_entire_op(const int op)
+static inlined_cachefunc bool icache_enabled(void)
+{
+ if (!icache_exists())
+ return false;
+
+ return !(read_aux_reg(ARC_AUX_IC_CTRL) & IC_CTRL_CACHE_DISABLE);
+}
+
+static inlined_cachefunc bool dcache_exists(void)
+{
+ union bcr_di_cache dbcr;
+
+ dbcr.word = read_aux_reg(ARC_BCR_DC_BUILD);
+ return !!dbcr.fields.ver;
+}
+
+static inlined_cachefunc bool dcache_enabled(void)
+{
+ if (!dcache_exists())
+ return false;
+
+ return !(read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_CACHE_DISABLE);
+}
+
+static inlined_cachefunc bool slc_exists(void)
+{
+ if (is_isa_arcv2()) {
+ union bcr_generic sbcr;
+
+ sbcr.word = read_aux_reg(ARC_BCR_SLC);
+ return !!sbcr.fields.ver;
+ }
+
+ return false;
+}
+
+static inlined_cachefunc bool slc_data_bypass(void)
+{
+ /*
+ * If L1 data cache is disabled SL$ is bypassed and all load/store
+ * requests are sent directly to main memory.
+ */
+ return !dcache_enabled();
+}
+
+static inline bool ioc_exists(void)
+{
+ if (is_isa_arcv2()) {
+ union bcr_clust_cfg cbcr;
+
+ cbcr.word = read_aux_reg(ARC_BCR_CLUSTER);
+ return cbcr.fields.c;
+ }
+
+ return false;
+}
+
+static inline bool ioc_enabled(void)
+{
+ /*
+ * We check only CONFIG option instead of IOC HW state check as IOC
+ * must be disabled by default.
+ */
+ if (is_ioc_enabled())
+ return ioc_exists();
+
+ return false;
+}
+
+static inlined_cachefunc void __slc_entire_op(const int op)
{
unsigned int ctrl;
+ if (!slc_exists())
+ return;
+
ctrl = read_aux_reg(ARC_AUX_SLC_CTRL);
if (!(op & OP_FLUSH)) /* i.e. OP_INV */
static void slc_upper_region_init(void)
{
+ /*
+ * 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 (!pae_exists())
+ return;
+
/*
* ARC_AUX_SLC_RGN_END1 and ARC_AUX_SLC_RGN_START1 are always == 0
* as we don't use PAE40.
static void __slc_rgn_op(unsigned long paddr, unsigned long sz, const int op)
{
+#ifdef CONFIG_ISA_ARCV2
+
unsigned int ctrl;
unsigned long end;
+ if (!slc_exists())
+ return;
+
/*
* The Region Flush operation is specified by CTRL.RGN_OP[11..9]
* - b'000 (default) is Flush,
* 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;
+ end = paddr + sz + gd->arch.slc_line_sz - 1;
/*
* Upper addresses (ARC_AUX_SLC_RGN_END1 and ARC_AUX_SLC_RGN_START1)
read_aux_reg(ARC_AUX_SLC_CTRL);
while (read_aux_reg(ARC_AUX_SLC_CTRL) & SLC_CTRL_BUSY);
-}
+
#endif /* CONFIG_ISA_ARCV2 */
+}
+
+static void arc_ioc_setup(void)
+{
+ /* IOC Aperture start is equal to DDR start */
+ unsigned int ap_base = CONFIG_SYS_SDRAM_BASE;
+ /* IOC Aperture size is equal to DDR size */
+ long ap_size = CONFIG_SYS_SDRAM_SIZE;
+
+ /* Unsupported configuration. See [ NOTE 2 ] for more details. */
+ if (!slc_exists())
+ panic("Try to enable IOC but SLC is not present");
+
+ /* Unsupported configuration. See [ NOTE 2 ] for more details. */
+ if (!dcache_enabled())
+ panic("Try to enable IOC but L1 D$ is disabled");
+
+ if (!is_power_of_2(ap_size) || ap_size < 4096)
+ panic("IOC Aperture size must be power of 2 and bigger 4Kib");
+
+ /* IOC Aperture start must be aligned to the size of the aperture */
+ if (ap_base % ap_size != 0)
+ panic("IOC Aperture start must be aligned to the size of the aperture");
+
+ flush_n_invalidate_dcache_all();
+
+ /*
+ * IOC Aperture size decoded as 2 ^ (SIZE + 2) KB,
+ * so setting 0x11 implies 512M, 0x12 implies 1G...
+ */
+ write_aux_reg(ARC_AUX_IO_COH_AP0_SIZE,
+ order_base_2(ap_size / 1024) - 2);
+
+ 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);
+}
-#ifdef CONFIG_ISA_ARCV2
static void read_decode_cache_bcr_arcv2(void)
{
- union {
- struct {
-#ifdef CONFIG_CPU_BIG_ENDIAN
- unsigned int pad:24, way:2, lsz:2, sz:4;
-#else
- unsigned int sz:4, lsz:2, way:2, pad:24;
-#endif
- } fields;
- unsigned int word;
- } slc_cfg;
-
- union {
- struct {
-#ifdef CONFIG_CPU_BIG_ENDIAN
- unsigned int pad:24, ver:8;
-#else
- unsigned int ver:8, pad:24;
-#endif
- } fields;
- unsigned int word;
- } sbcr;
+#ifdef CONFIG_ISA_ARCV2
- sbcr.word = read_aux_reg(ARC_BCR_SLC);
- if (sbcr.fields.ver) {
+ union bcr_slc_cfg slc_cfg;
+
+ if (slc_exists()) {
slc_cfg.word = read_aux_reg(ARC_AUX_SLC_CONFIG);
- slc_exists = true;
- slc_line_sz = (slc_cfg.fields.lsz == 0) ? 128 : 64;
- }
+ gd->arch.slc_line_sz = (slc_cfg.fields.lsz == 0) ? 128 : 64;
- union {
- struct bcr_clust_cfg {
-#ifdef CONFIG_CPU_BIG_ENDIAN
- unsigned int pad:7, c:1, num_entries:8, num_cores:8, ver:8;
-#else
- unsigned int ver:8, num_cores:8, num_entries:8, c:1, pad:7;
-#endif
- } fields;
- unsigned int word;
- } cbcr;
+ /*
+ * We don't support configuration where L1 I$ or L1 D$ is
+ * absent but SL$ exists. See [ NOTE 2 ] for more details.
+ */
+ if (!icache_exists() || !dcache_exists())
+ panic("Unsupported cache configuration: SLC exists but one of L1 caches is absent");
+ }
- cbcr.word = read_aux_reg(ARC_BCR_CLUSTER);
- if (cbcr.fields.c && ioc_enable)
- ioc_exists = true;
+#endif /* CONFIG_ISA_ARCV2 */
}
-#endif
void read_decode_cache_bcr(void)
{
int dc_line_sz = 0, ic_line_sz = 0;
-
- union {
- struct {
-#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
- } fields;
- unsigned int word;
- } ibcr, dbcr;
+ union bcr_di_cache ibcr, dbcr;
ibcr.word = read_aux_reg(ARC_BCR_IC_BUILD);
if (ibcr.fields.ver) {
- icache_exists = true;
- l1_line_sz = ic_line_sz = 8 << ibcr.fields.line_len;
+ gd->arch.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 = true;
- l1_line_sz = dc_line_sz = 16 << dbcr.fields.line_len;
+ gd->arch.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");
}
{
read_decode_cache_bcr();
-#ifdef CONFIG_ISA_ARCV2
- read_decode_cache_bcr_arcv2();
-
- if (ioc_exists) {
- /* IOC Aperture start is equal to DDR start */
- unsigned int ap_base = CONFIG_SYS_SDRAM_BASE;
- /* IOC Aperture size is equal to DDR size */
- long ap_size = CONFIG_SYS_SDRAM_SIZE;
-
- flush_dcache_all();
- invalidate_dcache_all();
+ if (is_isa_arcv2())
+ read_decode_cache_bcr_arcv2();
- if (!is_power_of_2(ap_size) || ap_size < 4096)
- panic("IOC Aperture size must be power of 2 and bigger 4Kib");
-
- /*
- * IOC Aperture size decoded as 2 ^ (SIZE + 2) KB,
- * so setting 0x11 implies 512M, 0x12 implies 1G...
- */
- write_aux_reg(ARC_AUX_IO_COH_AP0_SIZE,
- 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)
- panic("IOC Aperture start must be aligned to the size of the aperture");
-
- 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);
- }
+ if (is_isa_arcv2() && ioc_enabled())
+ arc_ioc_setup();
- 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)
+ if (is_isa_arcv2() && slc_exists())
slc_upper_region_init();
-#endif /* CONFIG_ISA_ARCV2 */
}
int icache_status(void)
{
- if (!icache_exists)
- return 0;
-
- if (read_aux_reg(ARC_AUX_IC_CTRL) & IC_CTRL_CACHE_DISABLE)
- return 0;
- else
- return 1;
+ return icache_enabled();
}
void icache_enable(void)
{
- if (icache_exists)
+ if (icache_exists())
write_aux_reg(ARC_AUX_IC_CTRL, read_aux_reg(ARC_AUX_IC_CTRL) &
~IC_CTRL_CACHE_DISABLE);
}
void icache_disable(void)
{
- if (icache_exists)
- write_aux_reg(ARC_AUX_IC_CTRL, read_aux_reg(ARC_AUX_IC_CTRL) |
- IC_CTRL_CACHE_DISABLE);
+ if (!icache_exists())
+ return;
+
+ __ic_entire_invalidate();
+
+ write_aux_reg(ARC_AUX_IC_CTRL, read_aux_reg(ARC_AUX_IC_CTRL) |
+ IC_CTRL_CACHE_DISABLE);
}
-void invalidate_icache_all(void)
+/* IC supports only invalidation */
+static inlined_cachefunc void __ic_entire_invalidate(void)
{
+ if (!icache_enabled())
+ return;
+
/* 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 */
- }
+ 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 */
+}
-#ifdef CONFIG_ISA_ARCV2
- if (slc_exists)
+void invalidate_icache_all(void)
+{
+ __ic_entire_invalidate();
+
+ /*
+ * If SL$ is bypassed for data it is used only for instructions,
+ * so we need to invalidate it too.
+ * TODO: HS 3.0 supports SLC disable so we need to check slc
+ * enable/disable status here.
+ */
+ if (is_isa_arcv2() && slc_data_bypass())
__slc_entire_op(OP_INV);
-#endif
}
int dcache_status(void)
{
- if (!dcache_exists)
- return 0;
-
- if (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_CACHE_DISABLE)
- return 0;
- else
- return 1;
+ return dcache_enabled();
}
void dcache_enable(void)
{
- if (!dcache_exists)
+ if (!dcache_exists())
return;
write_aux_reg(ARC_AUX_DC_CTRL, read_aux_reg(ARC_AUX_DC_CTRL) &
void dcache_disable(void)
{
- if (!dcache_exists)
+ if (!dcache_exists())
return;
+ __dc_entire_op(OP_FLUSH_N_INV);
+
+ /*
+ * As SLC will be bypassed for data after L1 D$ disable we need to
+ * flush it first before L1 D$ disable. Also we invalidate SLC to
+ * avoid any inconsistent data problems after enabling L1 D$ again with
+ * dcache_enable function.
+ */
+ if (is_isa_arcv2())
+ __slc_entire_op(OP_FLUSH_N_INV);
+
write_aux_reg(ARC_AUX_DC_CTRL, read_aux_reg(ARC_AUX_DC_CTRL) |
DC_CTRL_CACHE_DISABLE);
}
-#ifndef CONFIG_SYS_DCACHE_OFF
-/*
- * Common Helper for Line Operations on {I,D}-Cache
- */
-static inline void __cache_line_loop(unsigned long paddr, unsigned long sz,
- const int cacheop)
+/* Common Helper for Line Operations on D-cache */
+static inline void __dcache_line_loop(unsigned long paddr, unsigned long sz,
+ const int cacheop)
{
unsigned int aux_cmd;
-#if (CONFIG_ARC_MMU_VER == 3)
- unsigned int aux_tag;
-#endif
int num_lines;
- if (cacheop == OP_INV_IC) {
- aux_cmd = ARC_AUX_IC_IVIL;
-#if (CONFIG_ARC_MMU_VER == 3)
- aux_tag = ARC_AUX_IC_PTAG;
-#endif
- } else {
- /* d$ cmd: INV (discard or wback-n-discard) OR FLUSH (wback) */
- aux_cmd = cacheop & OP_INV ? ARC_AUX_DC_IVDL : ARC_AUX_DC_FLDL;
-#if (CONFIG_ARC_MMU_VER == 3)
- aux_tag = ARC_AUX_DC_PTAG;
-#endif
- }
+ /* d$ cmd: INV (discard or wback-n-discard) OR FLUSH (wback) */
+ aux_cmd = cacheop & OP_INV ? ARC_AUX_DC_IVDL : ARC_AUX_DC_FLDL;
sz += paddr & ~CACHE_LINE_MASK;
paddr &= CACHE_LINE_MASK;
- num_lines = DIV_ROUND_UP(sz, l1_line_sz);
+ num_lines = DIV_ROUND_UP(sz, gd->arch.l1_line_sz);
while (num_lines-- > 0) {
#if (CONFIG_ARC_MMU_VER == 3)
- write_aux_reg(aux_tag, paddr);
+ write_aux_reg(ARC_AUX_DC_PTAG, paddr);
#endif
write_aux_reg(aux_cmd, paddr);
- paddr += l1_line_sz;
+ paddr += gd->arch.l1_line_sz;
}
}
-static unsigned int __before_dc_op(const int op)
+static inlined_cachefunc void __before_dc_op(const int op)
{
- unsigned int reg;
+ unsigned int ctrl;
- 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_DC_CTRL);
- write_aux_reg(ARC_AUX_DC_CTRL, reg & ~DC_CTRL_INV_MODE_FLUSH);
- }
+ ctrl = read_aux_reg(ARC_AUX_DC_CTRL);
- return reg;
+ /* IM bit implies flush-n-inv, instead of vanilla inv */
+ if (op == OP_INV)
+ ctrl &= ~DC_CTRL_INV_MODE_FLUSH;
+ else
+ ctrl |= DC_CTRL_INV_MODE_FLUSH;
+
+ write_aux_reg(ARC_AUX_DC_CTRL, ctrl);
}
-static void __after_dc_op(const int op, unsigned int reg)
+static inlined_cachefunc void __after_dc_op(const int op)
{
if (op & OP_FLUSH) /* flush / flush-n-inv both wait */
while (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_FLUSH_STATUS);
-
- /* Switch back to default Invalidate mode */
- if (op == OP_INV)
- write_aux_reg(ARC_AUX_DC_CTRL, reg | DC_CTRL_INV_MODE_FLUSH);
}
-static inline void __dc_entire_op(const int cacheop)
+static inlined_cachefunc void __dc_entire_op(const int cacheop)
{
int aux;
- unsigned int ctrl_reg = __before_dc_op(cacheop);
+
+ if (!dcache_enabled())
+ return;
+
+ __before_dc_op(cacheop);
if (cacheop & OP_INV) /* Inv or flush-n-inv use same cmd reg */
aux = ARC_AUX_DC_IVDC;
write_aux_reg(aux, 0x1);
- __after_dc_op(cacheop, ctrl_reg);
+ __after_dc_op(cacheop);
}
static inline void __dc_line_op(unsigned long paddr, unsigned long sz,
const int cacheop)
{
- unsigned int ctrl_reg = __before_dc_op(cacheop);
+ if (!dcache_enabled())
+ return;
- __cache_line_loop(paddr, sz, cacheop);
- __after_dc_op(cacheop, ctrl_reg);
+ __before_dc_op(cacheop);
+ __dcache_line_loop(paddr, sz, cacheop);
+ __after_dc_op(cacheop);
}
-#else
-#define __dc_entire_op(cacheop)
-#define __dc_line_op(paddr, sz, cacheop)
-#endif /* !CONFIG_SYS_DCACHE_OFF */
void invalidate_dcache_range(unsigned long start, unsigned long end)
{
if (start >= end)
return;
-#ifdef CONFIG_ISA_ARCV2
- if (!ioc_exists)
-#endif
+ /*
+ * ARCv1 -> call __dc_line_op
+ * ARCv2 && L1 D$ disabled -> nothing
+ * ARCv2 && L1 D$ enabled && IOC enabled -> nothing
+ * ARCv2 && L1 D$ enabled && no IOC -> call __dc_line_op; call __slc_rgn_op
+ */
+ if (!is_isa_arcv2() || !ioc_enabled())
__dc_line_op(start, end - start, OP_INV);
-#ifdef CONFIG_ISA_ARCV2
- if (slc_exists && !ioc_exists)
+ if (is_isa_arcv2() && !ioc_enabled() && !slc_data_bypass())
__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
+ /*
+ * ARCv1 -> call __dc_line_op
+ * ARCv2 && L1 D$ disabled -> nothing
+ * ARCv2 && L1 D$ enabled && IOC enabled -> nothing
+ * ARCv2 && L1 D$ enabled && no IOC -> call __dc_line_op; call __slc_rgn_op
+ */
+ if (!is_isa_arcv2() || !ioc_enabled())
__dc_line_op(start, end - start, OP_FLUSH);
-#ifdef CONFIG_ISA_ARCV2
- if (slc_exists && !ioc_exists)
+ if (is_isa_arcv2() && !ioc_enabled() && !slc_data_bypass())
__slc_rgn_op(start, end - start, OP_FLUSH);
-#endif
}
void flush_cache(unsigned long start, unsigned long size)
flush_dcache_range(start, start + size);
}
-void invalidate_dcache_all(void)
+/*
+ * As invalidate_dcache_all() is not used in generic U-Boot code and as we
+ * don't need it in arch/arc code alone (invalidate without flush) we implement
+ * flush_n_invalidate_dcache_all (flush and invalidate in 1 operation) because
+ * it's much safer. See [ NOTE 1 ] for more details.
+ */
+void flush_n_invalidate_dcache_all(void)
{
- __dc_entire_op(OP_INV);
+ __dc_entire_op(OP_FLUSH_N_INV);
-#ifdef CONFIG_ISA_ARCV2
- if (slc_exists)
- __slc_entire_op(OP_INV);
-#endif
+ if (is_isa_arcv2() && !slc_data_bypass())
+ __slc_entire_op(OP_FLUSH_N_INV);
}
void flush_dcache_all(void)
{
__dc_entire_op(OP_FLUSH);
-#ifdef CONFIG_ISA_ARCV2
- if (slc_exists)
+ if (is_isa_arcv2() && !slc_data_bypass())
__slc_entire_op(OP_FLUSH);
-#endif
+}
+
+/*
+ * This is function to cleanup all caches (and therefore sync I/D caches) which
+ * can be used for cleanup before linux launch or to sync caches during
+ * relocation.
+ */
+void sync_n_cleanup_cache_all(void)
+{
+ __dc_entire_op(OP_FLUSH_N_INV);
+
+ /*
+ * If SL$ is bypassed for data it is used only for instructions,
+ * and we shouldn't flush it. So invalidate it instead of flush_n_inv.
+ */
+ if (is_isa_arcv2()) {
+ if (slc_data_bypass())
+ __slc_entire_op(OP_INV);
+ else
+ __slc_entire_op(OP_FLUSH_N_INV);
+ }
+
+ __ic_entire_invalidate();
}
projects / u-boot / commitdiff