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, 7 insertions, 6 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/pci.c b/drivers/gpu/nvgpu/common/linux/pci.c
index 401080ed..50d079bb 100644
--- a/drivers/gpu/nvgpu/common/linux/pci.c
+++ b/drivers/gpu/nvgpu/common/linux/pci.c
@@ -348,20 +348,21 @@ static int nvgpu_pci_init_support(struct pci_dev *pdev)
 {
         int err = 0;
         struct gk20a *g = get_gk20a(&pdev->dev);
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
 
-        g->regs = ioremap(pci_resource_start(pdev, 0),
+        l->regs = ioremap(pci_resource_start(pdev, 0),
                           pci_resource_len(pdev, 0));
-        if (IS_ERR(g->regs)) {
+        if (IS_ERR(l->regs)) {
                 nvgpu_err(g, "failed to remap gk20a registers");
-                err = PTR_ERR(g->regs);
+                err = PTR_ERR(l->regs);
                 goto fail;
         }
 
-        g->bar1 = ioremap(pci_resource_start(pdev, 1),
+        l->bar1 = ioremap(pci_resource_start(pdev, 1),
                           pci_resource_len(pdev, 1));
-        if (IS_ERR(g->bar1)) {
+        if (IS_ERR(l->bar1)) {
                 nvgpu_err(g, "failed to remap gk20a bar1");
-                err = PTR_ERR(g->bar1);
+                err = PTR_ERR(l->bar1);
                 goto fail;
         }