gpu: nvgpu: Abstract IO aperture accessors

Add abstraction of IO aperture accessors. Add new functions
gk20a_io_exists() and gk20a_io_valid_reg() to remove dependencies to
aperture fields from common code.

Implement Linux version of the abstraction by moving gk20a_readl()
and gk20a_writel() to new Linux specific io.c. Move the fields
defining IO aperture to nvgpu_os_linux.

Add t19x specific IO aperture initialization functions and add t19x
specific section to nvgpu_os_linux.

JIRA NVGPU-259

Change-Id: I09e79cda60d11a20d1099a9aaa6d2375236e94ce
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1569698
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 0 insertions, 26 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index cac62db7..a4becda0 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -65,32 +65,6 @@ void __nvgpu_check_gpu_state(struct gk20a *g)
         }
 }
 
-/*
- * Locks out the driver from accessing GPU registers. This prevents access to
- * thse registers after the GPU has been clock or power gated. This should help
- * find annoying bugs where register reads and writes are silently dropped
- * after the GPU has been turned off. On older chips these reads and writes can
- * also lock the entire CPU up.
- */
-int gk20a_lockout_registers(struct gk20a *g)
-{
-        g->regs = NULL;
-        g->bar1 = NULL;
-
-        return 0;
-}
-
-/*
- * Undoes gk20a_lockout_registers().
- */
-int gk20a_restore_registers(struct gk20a *g)
-{
-        g->regs = g->regs_saved;
-        g->bar1 = g->bar1_saved;
-
-        return 0;
-}
-
 void __gk20a_warn_on_no_regs(void)
 {
         WARN_ONCE(1, "Attempted access to GPU regs after unmapping!");