drm/amdgpu: add asic callback to get memsize register

Newer asics use different registers so abstract it.

Reviewed-by: Christian König <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

···
 	/* static power management */
 	int (*get_pcie_lanes)(struct amdgpu_device *adev);
 	void (*set_pcie_lanes)(struct amdgpu_device *adev, int lanes);
+	/* get config memsize register */
+	u32 (*get_config_memsize)(struct amdgpu_device *adev);
 };
 
 /*
···
 #define amdgpu_asic_read_disabled_bios(adev) (adev)->asic_funcs->read_disabled_bios((adev))
 #define amdgpu_asic_read_bios_from_rom(adev, b, l) (adev)->asic_funcs->read_bios_from_rom((adev), (b), (l))
 #define amdgpu_asic_read_register(adev, se, sh, offset, v)((adev)->asic_funcs->read_register((adev), (se), (sh), (offset), (v)))
+#define amdgpu_asic_get_config_memsize(adev) (adev)->asic_funcs->get_config_memsize((adev))
 #define amdgpu_gart_flush_gpu_tlb(adev, vmid) (adev)->gart.gart_funcs->flush_gpu_tlb((adev), (vmid))
 #define amdgpu_gart_set_pte_pde(adev, pt, idx, addr, flags) (adev)->gart.gart_funcs->set_pte_pde((adev), (pt), (idx), (addr), (flags))
 #define amdgpu_vm_copy_pte(adev, ib, pe, src, count) ((adev)->vm_manager.vm_pte_funcs->copy_pte((ib), (pe), (src), (count)))

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

···
 		return true;
 	}
 	/* then check MEM_SIZE, in case the crtcs are off */
-	reg = RREG32(mmCONFIG_MEMSIZE);
+	reg = amdgpu_asic_get_config_memsize(adev);
 
 	if (reg)
 		return false;

drivers/gpu/drm/amd/amdgpu/cik.c

···
 	return r;
 }
 
+static u32 cik_get_config_memsize(struct amdgpu_device *adev)
+{
+	return RREG32(mmCONFIG_MEMSIZE);
+}
+
 static int cik_set_uvd_clock(struct amdgpu_device *adev, u32 clock,
 			      u32 cntl_reg, u32 status_reg)
 {
···
 	.get_xclk = &cik_get_xclk,
 	.set_uvd_clocks = &cik_set_uvd_clocks,
 	.set_vce_clocks = &cik_set_vce_clocks,
+	.get_config_memsize = &cik_get_config_memsize,
 };
 
 static int cik_common_early_init(void *handle)

drivers/gpu/drm/amd/amdgpu/si.c

···
 #include "gmc/gmc_6_0_d.h"
 #include "dce/dce_6_0_d.h"
 #include "uvd/uvd_4_0_d.h"
+#include "bif/bif_3_0_d.h"
 
 static const u32 tahiti_golden_registers[] =
 {
···
 	return 0;
 }
 
+static u32 si_get_config_memsize(struct amdgpu_device *adev)
+{
+	return RREG32(mmCONFIG_MEMSIZE);
+}
+
 static void si_vga_set_state(struct amdgpu_device *adev, bool state)
 {
 	uint32_t temp;
···
 	.get_xclk = &si_get_xclk,
 	.set_uvd_clocks = &si_set_uvd_clocks,
 	.set_vce_clocks = NULL,
+	.get_config_memsize = &si_get_config_memsize,
 };
 
 static uint32_t si_get_rev_id(struct amdgpu_device *adev)

drivers/gpu/drm/amd/amdgpu/vi.c

···
 	return r;
 }
 
+static u32 vi_get_config_memsize(struct amdgpu_device *adev)
+{
+	return RREG32(mmCONFIG_MEMSIZE);
+}
+
 static int vi_set_uvd_clock(struct amdgpu_device *adev, u32 clock,
 			u32 cntl_reg, u32 status_reg)
 {
···
 	.get_xclk = &vi_get_xclk,
 	.set_uvd_clocks = &vi_set_uvd_clocks,
 	.set_vce_clocks = &vi_set_vce_clocks,
+	.get_config_memsize = &vi_get_config_memsize,
 };
 
 static int vi_common_early_init(void *handle)