xtensa: fix ibreakenable register update

Only set the register when there is at least one ibreak register,
otherwise the build fails:
	arch/xtensa/kernel/head.S:105: Error: invalid register 'ibreakenable'
	for 'wsr' instruction
	arch/xtensa/platforms/iss/setup.c:67: Error: invalid register
	'ibreakenable' for 'wsr' instruction

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>

4 files changed, 8 insertions, 0 deletions

diff --git a/arch/xtensa/kernel/head.S b/arch/xtensa/kernel/head.S
index df88f98737f4..4566683abc8d 100644
--- a/arch/xtensa/kernel/head.S
+++ b/arch/xtensa/kernel/head.S
@@ -86,7 +86,9 @@ ENTRY(_startup)
         /* Clear debugging registers. */
 
 #if XCHAL_HAVE_DEBUG
+#if XCHAL_NUM_IBREAK > 0
         wsr     a0, ibreakenable
+#endif
         wsr     a0, icount
         movi    a1, 15
         wsr     a0, icountlevel
diff --git a/arch/xtensa/platforms/iss/setup.c b/arch/xtensa/platforms/iss/setup.c
index e1700102f35e..b68916fd0d7a 100644
--- a/arch/xtensa/platforms/iss/setup.c
+++ b/arch/xtensa/platforms/iss/setup.c
@@ -64,7 +64,9 @@ void platform_restart(void)
                              "wsr       a2, icountlevel\n\t"
                              "movi      a2, 0\n\t"
                              "wsr       a2, icount\n\t"
+#if XCHAL_NUM_IBREAK > 0
                              "wsr       a2, ibreakenable\n\t"
+#endif
                              "wsr       a2, lcount\n\t"
                              "movi      a2, 0x1f\n\t"
                              "wsr       a2, ps\n\t"
diff --git a/arch/xtensa/platforms/xt2000/setup.c b/arch/xtensa/platforms/xt2000/setup.c
index c7d90f17886e..f9bc87966290 100644
--- a/arch/xtensa/platforms/xt2000/setup.c
+++ b/arch/xtensa/platforms/xt2000/setup.c
@@ -69,7 +69,9 @@ void platform_restart(void)
                               "wsr      a2, icountlevel\n\t"
                               "movi     a2, 0\n\t"
                               "wsr      a2, icount\n\t"
+#if XCHAL_NUM_IBREAK > 0
                               "wsr      a2, ibreakenable\n\t"
+#endif
                               "wsr      a2, lcount\n\t"
                               "movi     a2, 0x1f\n\t"
                               "wsr      a2, ps\n\t"
diff --git a/arch/xtensa/platforms/xtfpga/setup.c b/arch/xtensa/platforms/xtfpga/setup.c
index 9d888a2a5755..96ef8eeb064e 100644
--- a/arch/xtensa/platforms/xtfpga/setup.c
+++ b/arch/xtensa/platforms/xtfpga/setup.c
@@ -60,7 +60,9 @@ void platform_restart(void)
                               "wsr      a2, icountlevel\n\t"
                               "movi     a2, 0\n\t"
                               "wsr      a2, icount\n\t"
+#if XCHAL_NUM_IBREAK > 0
                               "wsr      a2, ibreakenable\n\t"
+#endif
                               "wsr      a2, lcount\n\t"
                               "movi     a2, 0x1f\n\t"
                               "wsr      a2, ps\n\t"