ARC: Move cache global variables to arch_global_data

There is a problem with current implementation if we start U-Boot
from ROM, as we use global variables before ther initialization,
so these variables get overwritten when we copy .data section
from ROM.

Instead we move these global variables into our "global data"
structure so that we may really start from ROM.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

arch/arc/include/asm/global_data.h

@@ -7,9 +7,15 @@
 #ifndef	__ASM_ARC_GLOBAL_DATA_H
 #define __ASM_ARC_GLOBAL_DATA_H
 
+#include <config.h>
+
 #ifndef __ASSEMBLY__
 /* Architecture-specific global data */
 struct arch_global_data {
+	int l1_line_sz;
+#if defined(CONFIG_ISA_ARCV2)
+	int slc_line_sz;
+#endif
 };
 #endif /* __ASSEMBLY__ */
 

arch/arc/lib/cache.c

@@ -87,6 +87,8 @@
  * and disable.
  */
 
+DECLARE_GLOBAL_DATA_PTR;
+
 /* Bit values in IC_CTRL */
 #define IC_CTRL_CACHE_DISABLE	BIT(0)
 
@@ -110,11 +112,8 @@
  * 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");
-
-#define CACHE_LINE_MASK		(~(l1_line_sz - 1))
+#define CACHE_LINE_MASK		(~(gd->arch.l1_line_sz - 1))
 
-int slc_line_sz __section(".data");
 bool ioc_exists __section(".data") = false;
 
 /* To force enable IOC set ioc_enable to 'true' */
@@ -237,7 +236,7 @@ static void __slc_rgn_op(unsigned long paddr, unsigned long sz, const int op)
 	 * 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)
@@ -292,7 +291,7 @@ static void read_decode_cache_bcr_arcv2(void)
 
 	if (slc_exists()) {
 		slc_cfg.word = read_aux_reg(ARC_AUX_SLC_CONFIG);
-		slc_line_sz = (slc_cfg.fields.lsz == 0) ? 128 : 64;
+		gd->arch.slc_line_sz = (slc_cfg.fields.lsz == 0) ? 128 : 64;
 	}
 
 	cbcr.word = read_aux_reg(ARC_BCR_CLUSTER);
@@ -309,14 +308,14 @@ void read_decode_cache_bcr(void)
 
 	ibcr.word = read_aux_reg(ARC_BCR_IC_BUILD);
 	if (ibcr.fields.ver) {
-		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) {
-		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");
 	}
@@ -437,14 +436,14 @@ static inline void __dcache_line_loop(unsigned long paddr, unsigned long sz,
 	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(ARC_AUX_DC_PTAG, paddr);
 #endif
 		write_aux_reg(aux_cmd, paddr);
-		paddr += l1_line_sz;
+		paddr += gd->arch.l1_line_sz;
 	}
 }