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authorMax Filippov <jcmvbkbc@gmail.com>2016-11-16 15:02:29 -0800
committerMax Filippov <jcmvbkbc@gmail.com>2016-11-16 15:08:28 -0800
commit3863c58cc742df9e5f9ef0bde7dc135fdc547c19 (patch)
tree8ac44acbbfcaa5d313f746f1367a2bba98e0f8f2 /arch/xtensa/kernel/setup.c
parent03eae3aca94c1e598be3ff40af492e1ca299577b (diff)
downloadlinux-3863c58cc742df9e5f9ef0bde7dc135fdc547c19.tar.bz2
xtensa: move S32C1I self-test to a separate file
The test is not called from any of the setup functions, so there's no reason keeping it in the setup.c. Move it to s32c1i_selftest.c and drop related #include directives. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel/setup.c')
-rw-r--r--arch/xtensa/kernel/setup.c115
1 files changed, 0 insertions, 115 deletions
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index 80ed169dce07..848e8568fb3c 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -44,7 +44,6 @@
#include <asm/page.h>
#include <asm/setup.h>
#include <asm/param.h>
-#include <asm/traps.h>
#include <asm/smp.h>
#include <asm/sysmem.h>
@@ -311,120 +310,6 @@ extern char _SecondaryResetVector_text_start;
extern char _SecondaryResetVector_text_end;
#endif
-
-#ifdef CONFIG_S32C1I_SELFTEST
-#if XCHAL_HAVE_S32C1I
-
-static int __initdata rcw_word, rcw_probe_pc, rcw_exc;
-
-/*
- * Basic atomic compare-and-swap, that records PC of S32C1I for probing.
- *
- * If *v == cmp, set *v = set. Return previous *v.
- */
-static inline int probed_compare_swap(int *v, int cmp, int set)
-{
- int tmp;
-
- __asm__ __volatile__(
- " movi %1, 1f\n"
- " s32i %1, %4, 0\n"
- " wsr %2, scompare1\n"
- "1: s32c1i %0, %3, 0\n"
- : "=a" (set), "=&a" (tmp)
- : "a" (cmp), "a" (v), "a" (&rcw_probe_pc), "0" (set)
- : "memory"
- );
- return set;
-}
-
-/* Handle probed exception */
-
-static void __init do_probed_exception(struct pt_regs *regs,
- unsigned long exccause)
-{
- if (regs->pc == rcw_probe_pc) { /* exception on s32c1i ? */
- regs->pc += 3; /* skip the s32c1i instruction */
- rcw_exc = exccause;
- } else {
- do_unhandled(regs, exccause);
- }
-}
-
-/* Simple test of S32C1I (soc bringup assist) */
-
-static int __init check_s32c1i(void)
-{
- int n, cause1, cause2;
- void *handbus, *handdata, *handaddr; /* temporarily saved handlers */
-
- rcw_probe_pc = 0;
- handbus = trap_set_handler(EXCCAUSE_LOAD_STORE_ERROR,
- do_probed_exception);
- handdata = trap_set_handler(EXCCAUSE_LOAD_STORE_DATA_ERROR,
- do_probed_exception);
- handaddr = trap_set_handler(EXCCAUSE_LOAD_STORE_ADDR_ERROR,
- do_probed_exception);
-
- /* First try an S32C1I that does not store: */
- rcw_exc = 0;
- rcw_word = 1;
- n = probed_compare_swap(&rcw_word, 0, 2);
- cause1 = rcw_exc;
-
- /* took exception? */
- if (cause1 != 0) {
- /* unclean exception? */
- if (n != 2 || rcw_word != 1)
- panic("S32C1I exception error");
- } else if (rcw_word != 1 || n != 1) {
- panic("S32C1I compare error");
- }
-
- /* Then an S32C1I that stores: */
- rcw_exc = 0;
- rcw_word = 0x1234567;
- n = probed_compare_swap(&rcw_word, 0x1234567, 0xabcde);
- cause2 = rcw_exc;
-
- if (cause2 != 0) {
- /* unclean exception? */
- if (n != 0xabcde || rcw_word != 0x1234567)
- panic("S32C1I exception error (b)");
- } else if (rcw_word != 0xabcde || n != 0x1234567) {
- panic("S32C1I store error");
- }
-
- /* Verify consistency of exceptions: */
- if (cause1 || cause2) {
- pr_warn("S32C1I took exception %d, %d\n", cause1, cause2);
- /* If emulation of S32C1I upon bus error gets implemented,
- we can get rid of this panic for single core (not SMP) */
- panic("S32C1I exceptions not currently supported");
- }
- if (cause1 != cause2)
- panic("inconsistent S32C1I exceptions");
-
- trap_set_handler(EXCCAUSE_LOAD_STORE_ERROR, handbus);
- trap_set_handler(EXCCAUSE_LOAD_STORE_DATA_ERROR, handdata);
- trap_set_handler(EXCCAUSE_LOAD_STORE_ADDR_ERROR, handaddr);
- return 0;
-}
-
-#else /* XCHAL_HAVE_S32C1I */
-
-/* This condition should not occur with a commercially deployed processor.
- Display reminder for early engr test or demo chips / FPGA bitstreams */
-static int __init check_s32c1i(void)
-{
- pr_warn("Processor configuration lacks atomic compare-and-swap support!\n");
- return 0;
-}
-
-#endif /* XCHAL_HAVE_S32C1I */
-early_initcall(check_s32c1i);
-#endif /* CONFIG_S32C1I_SELFTEST */
-
static inline int mem_reserve(unsigned long start, unsigned long end)
{
return memblock_reserve(start, end - start);