MIPS: Remove unused R6000 support

The kernel contains a small amount of incomplete code aimed at
supporting old R6000 CPUs. This is:

  - Unused, as no machine selects CONFIG_SYS_HAS_CPU_R6000.

  - Broken, since there are glaring errors such as r6000_fpu.S moving
    the FCSR register to t1, then ignoring it & instead saving t0 into
    struct sigcontext...

  - A maintenance headache, since it's code that nobody can test which
    nevertheless imposes constraints on code which it shares with other
    machines.

Remove this incomplete & broken R6000 CPU support in order to clean up
and in preparation for changes which will no longer need to consider
dragging the pretense of R6000 support along with them.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16236/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 0 insertions, 15 deletions

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index b68b4d0726d3..b52a785477f9 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -2428,21 +2428,6 @@ void __init trap_init(void)
         set_except_vector(EXCCODE_TR, handle_tr);
         set_except_vector(EXCCODE_MSAFPE, handle_msa_fpe);
 
-        if (current_cpu_type() == CPU_R6000 ||
-            current_cpu_type() == CPU_R6000A) {
-                /*
-                 * The R6000 is the only R-series CPU that features a machine
-                 * check exception (similar to the R4000 cache error) and
-                 * unaligned ldc1/sdc1 exception.  The handlers have not been
-                 * written yet.  Well, anyway there is no R6000 machine on the
-                 * current list of targets for Linux/MIPS.
-                 * (Duh, crap, there is someone with a triple R6k machine)
-                 */
-                //set_except_vector(14, handle_mc);
-                //set_except_vector(15, handle_ndc);
-        }
-
-
         if (board_nmi_handler_setup)
                 board_nmi_handler_setup();