arc: move common sources in library

"reset.c" and "cpu.c" have no architecture-specific code at all.
Others are applicable to either ARC CPU.

This change is a preparation to submission of ARCv2 architecture port.

Even though ARCv1 and ARCv2 ISAs are not binary compatible most of
built-in modules still have the same programming model - AUX registers
are mapped in the same addresses and hold the same data (new featues
extend existing ones).

So only low-level assembly code (start-up, interrupt handlers) is left
as CPU(actually ISA)-specific. This significantyl simplifies maintenance
of multiple CPUs/ISAs.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Igor Guryanov <guryanov@synopsys.com>

6 files changed, 1 insertions, 406 deletions

diff --git a/arch/arc/cpu/arc700/Makefile b/arch/arc/cpu/arc700/Makefile
index 021e3a2..3704ebe 100644
--- a/arch/arc/cpu/arc700/Makefile
+++ b/arch/arc/cpu/arc700/Makefile
@@ -4,9 +4,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y	+= cache.o
-obj-y	+= cpu.o
-obj-y	+= interrupts.o
-obj-y	+= reset.o
-obj-y	+= start.o
-obj-y	+= timer.o
+obj-y += start.o
diff --git a/arch/arc/cpu/arc700/cache.c b/arch/arc/cpu/arc700/cache.c
deleted file mode 100644
index fa19a13..0000000
--- a/arch/arc/cpu/arc700/cache.c
+++ /dev/null
@@ -1,167 +0,0 @@
-/*
- * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <config.h>
-#include <asm/arcregs.h>
-
-/* Bit values in IC_CTRL */
-#define IC_CTRL_CACHE_DISABLE	(1 << 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 CACHE_VER_NUM_MASK	0xF
-
-int icache_status(void)
-{
-	/* If no cache in CPU exit immediately */
-	if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK))
-		return 0;
-
-	return (read_aux_reg(ARC_AUX_IC_CTRL) & IC_CTRL_CACHE_DISABLE) !=
-	       IC_CTRL_CACHE_DISABLE;
-}
-
-void icache_enable(void)
-{
-	/* If no cache in CPU exit immediately */
-	if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK))
-		return;
-
-	write_aux_reg(ARC_AUX_IC_CTRL, read_aux_reg(ARC_AUX_IC_CTRL) &
-		      ~IC_CTRL_CACHE_DISABLE);
-}
-
-void icache_disable(void)
-{
-	/* If no cache in CPU exit immediately */
-	if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK))
-		return;
-
-	write_aux_reg(ARC_AUX_IC_CTRL, read_aux_reg(ARC_AUX_IC_CTRL) |
-		      IC_CTRL_CACHE_DISABLE);
-}
-
-void invalidate_icache_all(void)
-{
-#ifndef CONFIG_SYS_ICACHE_OFF
-	/* Any write to IC_IVIC register triggers invalidation of entire I$ */
-	write_aux_reg(ARC_AUX_IC_IVIC, 1);
-#endif /* CONFIG_SYS_ICACHE_OFF */
-}
-
-int dcache_status(void)
-{
-	/* If no cache in CPU exit immediately */
-	if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK))
-		return 0;
-
-	return (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_CACHE_DISABLE) !=
-		DC_CTRL_CACHE_DISABLE;
-}
-
-void dcache_enable(void)
-{
-	/* If no cache in CPU exit immediately */
-	if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK))
-		return;
-
-	write_aux_reg(ARC_AUX_DC_CTRL, read_aux_reg(ARC_AUX_DC_CTRL) &
-		      ~(DC_CTRL_INV_MODE_FLUSH | DC_CTRL_CACHE_DISABLE));
-}
-
-void dcache_disable(void)
-{
-	/* If no cache in CPU exit immediately */
-	if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK))
-		return;
-
-	write_aux_reg(ARC_AUX_DC_CTRL, read_aux_reg(ARC_AUX_DC_CTRL) |
-		      DC_CTRL_CACHE_DISABLE);
-}
-
-void flush_dcache_all(void)
-{
-	/* If no cache in CPU exit immediately */
-	if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK))
-		return;
-
-	/* Do flush of entire cache */
-	write_aux_reg(ARC_AUX_DC_FLSH, 1);
-
-	/* Wait flush end */
-	while (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_FLUSH_STATUS)
-		;
-}
-
-#ifndef CONFIG_SYS_DCACHE_OFF
-static void dcache_flush_line(unsigned addr)
-{
-#if (CONFIG_ARC_MMU_VER > 2)
-	write_aux_reg(ARC_AUX_DC_PTAG, addr);
-#endif
-	write_aux_reg(ARC_AUX_DC_FLDL, addr);
-
-	/* Wait flush end */
-	while (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_FLUSH_STATUS)
-		;
-
-#ifndef CONFIG_SYS_ICACHE_OFF
-	/*
-	 * Invalidate I$ for addresses range just flushed from D$.
-	 * If we try to execute data flushed above it will be valid/correct
-	 */
-#if (CONFIG_ARC_MMU_VER > 2)
-	write_aux_reg(ARC_AUX_IC_PTAG, addr);
-#endif
-	write_aux_reg(ARC_AUX_IC_IVIL, addr);
-#endif /* CONFIG_SYS_ICACHE_OFF */
-}
-#endif /* CONFIG_SYS_DCACHE_OFF */
-
-void flush_dcache_range(unsigned long start, unsigned long end)
-{
-#ifndef CONFIG_SYS_DCACHE_OFF
-	unsigned int addr;
-
-	start = start & (~(CONFIG_SYS_CACHELINE_SIZE - 1));
-	end = end & (~(CONFIG_SYS_CACHELINE_SIZE - 1));
-
-	for (addr = start; addr <= end; addr += CONFIG_SYS_CACHELINE_SIZE)
-		dcache_flush_line(addr);
-#endif /* CONFIG_SYS_DCACHE_OFF */
-}
-
-void invalidate_dcache_range(unsigned long start, unsigned long end)
-{
-#ifndef CONFIG_SYS_DCACHE_OFF
-	unsigned int addr;
-
-	start = start & (~(CONFIG_SYS_CACHELINE_SIZE - 1));
-	end = end & (~(CONFIG_SYS_CACHELINE_SIZE - 1));
-
-	for (addr = start; addr <= end; addr += CONFIG_SYS_CACHELINE_SIZE) {
-#if (CONFIG_ARC_MMU_VER > 2)
-		write_aux_reg(ARC_AUX_DC_PTAG, addr);
-#endif
-		write_aux_reg(ARC_AUX_DC_IVDL, addr);
-	}
-#endif /* CONFIG_SYS_DCACHE_OFF */
-}
-
-void invalidate_dcache_all(void)
-{
-#ifndef CONFIG_SYS_DCACHE_OFF
-	/* Write 1 to DC_IVDC register triggers invalidation of entire D$ */
-	write_aux_reg(ARC_AUX_DC_IVDC, 1);
-#endif /* CONFIG_SYS_DCACHE_OFF */
-}
-
-void flush_cache(unsigned long start, unsigned long size)
-{
-	flush_dcache_range(start, start + size);
-}
diff --git a/arch/arc/cpu/arc700/cpu.c b/arch/arc/cpu/arc700/cpu.c
deleted file mode 100644
index 50634b8..0000000
--- a/arch/arc/cpu/arc700/cpu.c
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <common.h>
-#include <asm/arcregs.h>
-#include <asm/cache.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-int arch_cpu_init(void)
-{
-#ifdef CONFIG_SYS_ICACHE_OFF
-	icache_disable();
-#else
-	icache_enable();
-	invalidate_icache_all();
-#endif
-
-	flush_dcache_all();
-#ifdef CONFIG_SYS_DCACHE_OFF
-	dcache_disable();
-#else
-	dcache_enable();
-#endif
-	timer_init();
-
-/* In simulation (ISS) "CHIPID" and "ARCNUM" are all "ff" */
-	if ((read_aux_reg(ARC_AUX_IDENTITY) & 0xffffff00) == 0xffffff00)
-		gd->arch.running_on_hw = 0;
-	else
-		gd->arch.running_on_hw = 1;
-
-	gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
-	gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
-
-	return 0;
-}
-
-int arch_early_init_r(void)
-{
-	gd->bd->bi_memstart = CONFIG_SYS_SDRAM_BASE;
-	gd->bd->bi_memsize = CONFIG_SYS_SDRAM_SIZE;
-	return 0;
-}
diff --git a/arch/arc/cpu/arc700/interrupts.c b/arch/arc/cpu/arc700/interrupts.c
deleted file mode 100644
index d7cab3b..0000000
--- a/arch/arc/cpu/arc700/interrupts.c
+++ /dev/null
@@ -1,143 +0,0 @@
-/*
- * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <common.h>
-#include <asm/arcregs.h>
-#include <asm/ptrace.h>
-
-/* Bit values in STATUS32 */
-#define E1_MASK		(1 << 1)	/* Level 1 interrupts enable */
-#define E2_MASK		(1 << 2)	/* Level 2 interrupts enable */
-
-int interrupt_init(void)
-{
-	return 0;
-}
-
-/*
- * returns true if interrupts had been enabled before we disabled them
- */
-int disable_interrupts(void)
-{
-	int status = read_aux_reg(ARC_AUX_STATUS32);
-	int state = (status & (E1_MASK | E2_MASK)) ? 1 : 0;
-
-	status &= ~(E1_MASK | E2_MASK);
-	/* STATUS32 register is updated indirectly with "FLAG" instruction */
-	__asm__("flag %0" : : "r" (status));
-	return state;
-}
-
-void enable_interrupts(void)
-{
-	unsigned int status = read_aux_reg(ARC_AUX_STATUS32);
-
-	status |= E1_MASK | E2_MASK;
-	/* STATUS32 register is updated indirectly with "FLAG" instruction */
-	__asm__("flag %0" : : "r" (status));
-}
-
-static void print_reg_file(long *reg_rev, int start_num)
-{
-	unsigned int i;
-
-	/* Print 3 registers per line */
-	for (i = start_num; i < start_num + 25; i++) {
-		printf("r%02u: 0x%08lx\t", i, (unsigned long)*reg_rev);
-		if (((i + 1) % 3) == 0)
-			printf("\n");
-
-		/* Because pt_regs has registers reversed */
-		reg_rev--;
-	}
-
-	/* Add new-line if none was inserted in the end of loop above */
-	if (((i + 1) % 3) != 0)
-		printf("\n");
-}
-
-void show_regs(struct pt_regs *regs)
-{
-	printf("ECR:\t0x%08lx\n", regs->ecr);
-	printf("RET:\t0x%08lx\nBLINK:\t0x%08lx\nSTAT32:\t0x%08lx\n",
-	       regs->ret, regs->blink, regs->status32);
-	printf("GP: 0x%08lx\t r25: 0x%08lx\t\n", regs->r26, regs->r25);
-	printf("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n", regs->bta,
-	       regs->sp, regs->fp);
-	printf("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n", regs->lp_start,
-	       regs->lp_end, regs->lp_count);
-
-	print_reg_file(&(regs->r0), 0);
-}
-
-void bad_mode(struct pt_regs *regs)
-{
-	if (regs)
-		show_regs(regs);
-
-	panic("Resetting CPU ...\n");
-}
-
-void do_memory_error(unsigned long address, struct pt_regs *regs)
-{
-	printf("Memory error exception @ 0x%lx\n", address);
-	bad_mode(regs);
-}
-
-void do_instruction_error(unsigned long address, struct pt_regs *regs)
-{
-	printf("Instruction error exception @ 0x%lx\n", address);
-	bad_mode(regs);
-}
-
-void do_machine_check_fault(unsigned long address, struct pt_regs *regs)
-{
-	printf("Machine check exception @ 0x%lx\n", address);
-	bad_mode(regs);
-}
-
-void do_interrupt_handler(void)
-{
-	printf("Interrupt fired\n");
-	bad_mode(0);
-}
-
-void do_itlb_miss(struct pt_regs *regs)
-{
-	printf("I TLB miss exception\n");
-	bad_mode(regs);
-}
-
-void do_dtlb_miss(struct pt_regs *regs)
-{
-	printf("D TLB miss exception\n");
-	bad_mode(regs);
-}
-
-void do_tlb_prot_violation(unsigned long address, struct pt_regs *regs)
-{
-	printf("TLB protection violation or misaligned access @ 0x%lx\n",
-	       address);
-	bad_mode(regs);
-}
-
-void do_privilege_violation(struct pt_regs *regs)
-{
-	printf("Privilege violation exception\n");
-	bad_mode(regs);
-}
-
-void do_trap(struct pt_regs *regs)
-{
-	printf("Trap exception\n");
-	bad_mode(regs);
-}
-
-void do_extension(struct pt_regs *regs)
-{
-	printf("Extension instruction exception\n");
-	bad_mode(regs);
-}
diff --git a/arch/arc/cpu/arc700/reset.c b/arch/arc/cpu/arc700/reset.c
deleted file mode 100644
index 98ebf1d..0000000
--- a/arch/arc/cpu/arc700/reset.c
+++ /dev/null
@@ -1,19 +0,0 @@
-/*
- * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <command.h>
-#include <common.h>
-
-int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
-{
-	printf("Put your restart handler here\n");
-
-#ifdef DEBUG
-	/* Stop debug session here */
-	__asm__("brk");
-#endif
-	return 0;
-}
diff --git a/arch/arc/cpu/arc700/timer.c b/arch/arc/cpu/arc700/timer.c
deleted file mode 100644
index a0acbbc..0000000
--- a/arch/arc/cpu/arc700/timer.c
+++ /dev/null
@@ -1,24 +0,0 @@
-/*
- * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <asm/arcregs.h>
-
-#define NH_MODE	(1 << 1)	/* Disable timer if CPU is halted */
-
-int timer_init(void)
-{
-	write_aux_reg(ARC_AUX_TIMER0_CTRL, NH_MODE);
-	/* Set max value for counter/timer */
-	write_aux_reg(ARC_AUX_TIMER0_LIMIT, 0xffffffff);
-	/* Set initial count value and restart counter/timer */
-	write_aux_reg(ARC_AUX_TIMER0_CNT, 0);
-	return 0;
-}
-
-unsigned long timer_read_counter(void)
-{
-	return read_aux_reg(ARC_AUX_TIMER0_CNT);
-}