[AVR32] Clean up OCD register usage

Generate a new set of OCD register definitions in asm/ocd.h and rename
__mfdr() and __mtdr() to ocd_read() and ocd_write() respectively.

The bitfield definitions are a lot more complete now, and they are
entirely based on bit numbers, not masks. This is because OCD
registers are frequently accessed from assembly code, where bit
numbers are a lot more useful (can be fed directly to sbr, bfins,
etc.)

Bitfields that consist of more than one bit have two definitions:
_START, which indicates the number of the first bit, and _SIZE, which
indicates the number of bits. These directly correspond to the
parameters taken by the bfextu, bfexts and bfins instructions.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

arch/avr32/kernel/entry-avr32b.S

@@ -270,8 +270,8 @@ syscall_exit_work:
 	lsl	r3, 1
 	sbr	r3, 30
 	sbr	r3, 0
-	mtdr	DBGREG_BWA2A, r2
-	mtdr	DBGREG_BWC2A, r3
+	mtdr	OCD_BWA2A, r2
+	mtdr	OCD_BWC2A, r3
 	rjmp	syscall_exit_cont
 
 
@@ -521,8 +521,8 @@ fault_exit_work:
 	lsl	r3, 1
 	sbr	r3, 30
 	sbr	r3, 0
-	mtdr	DBGREG_BWA2A, r2
-	mtdr	DBGREG_BWC2A, r3
+	mtdr	OCD_BWA2A, r2
+	mtdr	OCD_BWC2A, r3
 	rjmp	fault_resume_user
 
 	/* If we get a debug trap from privileged context we end up here */
@@ -636,9 +636,9 @@ debug_resume_user:
 
 3:	bld	r1, TIF_SINGLE_STEP
 	brcc	debug_restore_all
-	mfdr	r2, DBGREG_DC
-	sbr	r2, DC_SS_BIT
-	mtdr	DBGREG_DC, r2
+	mfdr	r2, OCD_DC
+	sbr	r2, OCD_DC_SS_BIT
+	mtdr	OCD_DC, r2
 	rjmp	debug_restore_all
 
 	.set	rsr_int0,	SYSREG_RSR_INT0

arch/avr32/kernel/kprobes.c

@@ -70,9 +70,9 @@ static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
 
 	BUG_ON(!(sysreg_read(SR) & SYSREG_BIT(SR_D)));
 
-	dc = __mfdr(DBGREG_DC);
-	dc |= DC_SS;
-	__mtdr(DBGREG_DC, dc);
+	dc = ocd_read(DC);
+	dc |= 1 << OCD_DC_SS_BIT;
+	ocd_write(DC, dc);
 
 	/*
 	 * We must run the instruction from its original location
@@ -91,9 +91,9 @@ static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
 
 	pr_debug("resuming execution at PC=%08lx\n", regs->pc);
 
-	dc = __mfdr(DBGREG_DC);
-	dc &= ~DC_SS;
-	__mtdr(DBGREG_DC, dc);
+	dc = ocd_read(DC);
+	dc &= ~(1 << OCD_DC_SS_BIT);
+	ocd_write(DC, dc);
 
 	*p->addr = BREAKPOINT_INSTRUCTION;
 	flush_icache_range((unsigned long)p->addr,
@@ -261,7 +261,7 @@ int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
 int __init arch_init_kprobes(void)
 {
 	printk("KPROBES: Enabling monitor mode (MM|DBE)...\n");
-	__mtdr(DBGREG_DC, DC_MM | DC_DBE);
+	ocd_write(DC, (1 << OCD_DC_MM_BIT) | (1 << OCD_DC_DBE_BIT));
 
 	/* TODO: Register kretprobe trampoline */
 	return 0;

arch/avr32/kernel/process.c

@@ -55,8 +55,8 @@ void machine_power_off(void)
 
 void machine_restart(char *cmd)
 {
-	__mtdr(DBGREG_DC, DC_DBE);
-	__mtdr(DBGREG_DC, DC_RES);
+	ocd_write(DC, (1 << OCD_DC_DBE_BIT));
+	ocd_write(DC, (1 << OCD_DC_RES_BIT));
 	while (1) ;
 }
 

arch/avr32/kernel/ptrace.c

@@ -159,7 +159,8 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 		 request, child->pid, addr, data);
 
 	pr_debug("ptrace: Enabling monitor mode...\n");
-	__mtdr(DBGREG_DC, __mfdr(DBGREG_DC) | DC_MM | DC_DBE);
+	ocd_write(DC, ocd_read(DC) | (1 << OCD_DC_MM_BIT)
+			| (1 << OCD_DC_DBE_BIT));
 
 	switch (request) {
 	/* Read the word at location addr in the child process */
@@ -240,7 +241,8 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 		break;
 	}
 
-	pr_debug("sys_ptrace returning %d (DC = 0x%08lx)\n", ret, __mfdr(DBGREG_DC));
+	pr_debug("sys_ptrace returning %d (DC = 0x%08lx)\n",
+			ret, ocd_read(DC));
 	return ret;
 }
 
@@ -276,11 +278,11 @@ asmlinkage void do_debug_priv(struct pt_regs *regs)
 	unsigned long dc, ds;
 	unsigned long die_val;
 
-	ds = __mfdr(DBGREG_DS);
+	ds = ocd_read(DS);
 
 	pr_debug("do_debug_priv: pc = %08lx, ds = %08lx\n", regs->pc, ds);
 
-	if (ds & DS_SSS)
+	if (ds & (1 << OCD_DS_SSS_BIT))
 		die_val = DIE_SSTEP;
 	else
 		die_val = DIE_BREAKPOINT;
@@ -288,14 +290,14 @@ asmlinkage void do_debug_priv(struct pt_regs *regs)
 	if (notify_die(die_val, "ptrace", regs, 0, 0, SIGTRAP) == NOTIFY_STOP)
 		return;
 
-	if (likely(ds & DS_SSS)) {
+	if (likely(ds & (1 << OCD_DS_SSS_BIT))) {
 		extern void itlb_miss(void);
 		extern void tlb_miss_common(void);
 		struct thread_info *ti;
 
-		dc = __mfdr(DBGREG_DC);
-		dc &= ~DC_SS;
-		__mtdr(DBGREG_DC, dc);
+		dc = ocd_read(DC);
+		dc &= ~(1 << OCD_DC_SS_BIT);
+		ocd_write(DC, dc);
 
 		ti = current_thread_info();
 		set_ti_thread_flag(ti, TIF_BREAKPOINT);
@@ -303,8 +305,8 @@ asmlinkage void do_debug_priv(struct pt_regs *regs)
 		/* The TLB miss handlers don't check thread flags */
 		if ((regs->pc >= (unsigned long)&itlb_miss)
 		    && (regs->pc <= (unsigned long)&tlb_miss_common)) {
-			__mtdr(DBGREG_BWA2A, sysreg_read(RAR_EX));
-			__mtdr(DBGREG_BWC2A, 0x40000001 | (get_asid() << 1));
+			ocd_write(BWA2A, sysreg_read(RAR_EX));
+			ocd_write(BWC2A, 0x40000001 | (get_asid() << 1));
 		}
 
 		/*
@@ -329,22 +331,22 @@ asmlinkage void do_debug(struct pt_regs *regs)
 {
 	unsigned long dc, ds;
 
-	ds = __mfdr(DBGREG_DS);
+	ds = ocd_read(DS);
 	pr_debug("do_debug: pc = %08lx, ds = %08lx\n", regs->pc, ds);
 
 	if (test_thread_flag(TIF_BREAKPOINT)) {
 		pr_debug("TIF_BREAKPOINT set\n");
 		/* We're taking care of it */
 		clear_thread_flag(TIF_BREAKPOINT);
-		__mtdr(DBGREG_BWC2A, 0);
+		ocd_write(BWC2A, 0);
 	}
 
 	if (test_thread_flag(TIF_SINGLE_STEP)) {
 		pr_debug("TIF_SINGLE_STEP set, ds = 0x%08lx\n", ds);
-		if (ds & DS_SSS) {
-			dc = __mfdr(DBGREG_DC);
-			dc &= ~DC_SS;
-			__mtdr(DBGREG_DC, dc);
+		if (ds & (1 << OCD_DS_SSS_BIT)) {
+			dc = ocd_read(DC);
+			dc &= ~(1 << OCD_DC_SS_BIT);
+			ocd_write(DC, dc);
 
 			clear_thread_flag(TIF_SINGLE_STEP);
 			ptrace_break(current, regs);

arch/avr32/kernel/traps.c

@@ -39,7 +39,7 @@ void NORET_TYPE die(const char *str, struct pt_regs *regs, long err)
 	printk("FRAME_POINTER ");
 #endif
 	if (current_cpu_data.features & AVR32_FEATURE_OCD) {
-		unsigned long did = __mfdr(DBGREG_DID);
+		unsigned long did = ocd_read(DID);
 		printk("chip: 0x%03lx:0x%04lx rev %lu\n",
 		       (did >> 1) & 0x7ff,
 		       (did >> 12) & 0x7fff,

include/asm-avr32/system.h

@@ -35,8 +35,8 @@
 #include <asm/ocd.h>
 #define finish_arch_switch(prev)			\
 	do {						\
-		__mtdr(DBGREG_PID, prev->pid);		\
-		__mtdr(DBGREG_PID, current->pid);	\
+		ocd_write(PID, prev->pid);		\
+		ocd_write(PID, current->pid);		\
 	} while(0)
 #endif