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, 49 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/io.h b/drivers/gpu/nvgpu/include/nvgpu/io.h
new file mode 100644
index 00000000..94ae8f95
--- /dev/null
+++ b/drivers/gpu/nvgpu/include/nvgpu/io.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#ifndef __NVGPU_IO_H__
+#define __NVGPU_IO_H__
+
+#include <nvgpu/types.h>
+#ifdef CONFIG_TEGRA_19x_GPU
+#include <nvgpu/io_t19x.h>
+#endif
+
+/* Legacy defines - should be removed once everybody uses nvgpu_* */
+#define gk20a_writel nvgpu_writel
+#define gk20a_readl nvgpu_readl
+#define gk20a_writel_check nvgpu_writel_check
+#define gk20a_bar1_writel nvgpu_bar1_writel
+#define gk20a_bar1_readl nvgpu_bar1_readl
+#define gk20a_io_exists nvgpu_io_exists
+#define gk20a_io_valid_reg nvgpu_io_valid_reg
+
+struct gk20a;
+
+void nvgpu_writel(struct gk20a *g, u32 r, u32 v);
+u32 nvgpu_readl(struct gk20a *g, u32 r);
+void nvgpu_writel_check(struct gk20a *g, u32 r, u32 v);
+void nvgpu_bar1_writel(struct gk20a *g, u32 b, u32 v);
+u32 nvgpu_bar1_readl(struct gk20a *g, u32 b);
+bool nvgpu_io_exists(struct gk20a *g);
+bool nvgpu_io_valid_reg(struct gk20a *g, u32 r);
+
+#endif