drm/amdgpu: expand sienna chichlid reg access support

Added dedicated 64bit reg read/write support

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: John Clements <john.clements@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/nv.c b/drivers/gpu/drm/amd/amdgpu/nv.c
index ea69ae7..74d02d2 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/nv.c
+++ b/drivers/gpu/drm/amd/amdgpu/nv.c
@@ -97,6 +97,49 @@ static void nv_pcie_wreg(struct amdgpu_device *adev, u32 reg, u32 v)
        spin_unlock_irqrestore(&adev->pcie_idx_lock, flags);
 }
 
+static u64 nv_pcie_rreg64(struct amdgpu_device *adev, u32 reg)
+{
+       unsigned long flags, address, data;
+       u64 r;
+       address = adev->nbio.funcs->get_pcie_index_offset(adev);
+       data = adev->nbio.funcs->get_pcie_data_offset(adev);
+
+       spin_lock_irqsave(&adev->pcie_idx_lock, flags);
+       /* read low 32 bit */
+       WREG32(address, reg);
+       (void)RREG32(address);
+       r = RREG32(data);
+
+       /* read high 32 bit*/
+       WREG32(address, reg + 4);
+       (void)RREG32(address);
+       r |= ((u64)RREG32(data) << 32);
+       spin_unlock_irqrestore(&adev->pcie_idx_lock, flags);
+       return r;
+}
+
+static void nv_pcie_wreg64(struct amdgpu_device *adev, u32 reg, u64 v)
+{
+       unsigned long flags, address, data;
+
+       address = adev->nbio.funcs->get_pcie_index_offset(adev);
+       data = adev->nbio.funcs->get_pcie_data_offset(adev);
+
+       spin_lock_irqsave(&adev->pcie_idx_lock, flags);
+       /* write low 32 bit */
+       WREG32(address, reg);
+       (void)RREG32(address);
+       WREG32(data, (u32)(v & 0xffffffffULL));
+       (void)RREG32(data);
+
+       /* write high 32 bit */
+       WREG32(address, reg + 4);
+       (void)RREG32(address);
+       WREG32(data, (u32)(v >> 32));
+       (void)RREG32(data);
+       spin_unlock_irqrestore(&adev->pcie_idx_lock, flags);
+}
+
 static u32 nv_didt_rreg(struct amdgpu_device *adev, u32 reg)
 {
        unsigned long flags, address, data;
@@ -673,6 +716,8 @@ static int nv_common_early_init(void *handle)
        adev->smc_wreg = NULL;
        adev->pcie_rreg = &nv_pcie_rreg;
        adev->pcie_wreg = &nv_pcie_wreg;
+       adev->pcie_rreg64 = &nv_pcie_rreg64;
+       adev->pcie_wreg64 = &nv_pcie_wreg64;
 
        /* TODO: will add them during VCN v2 implementation */
        adev->uvd_ctx_rreg = NULL;