PCI: tegra: Program AFI_CACHE_BAR_{0,1}_{ST,SZ} registers only for Tegra20

Cacheable upstream transactions are supported in Tegra20 and Tegra186
only.

AFI_CACHE_BAR_{0,1}_{ST,SZ} registers are available in Tegra20 to
support cacheable upstream transactions. In Tegra186, AFI_AXCACHE
register is defined instead of AFI_CACHE_BAR_{0,1}_{ST,SZ} to be in line
with its memory subsystem design.

Therefore, program AFI_CACHE_BAR_{0,1}_{ST,SZ} registers only for Tegra20.

Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
index 60051a4..69cf0a0 100644 (file)
--- a/drivers/pci/controller/pci-tegra.c
+++ b/drivers/pci/controller/pci-tegra.c
@@ -323,6 +323,7 @@ struct tegra_pcie_soc {
        bool program_deskew_time;
        bool raw_violation_fixup;
        bool update_fc_timer;
+       bool has_cache_bars;
        struct {
                struct {
                        u32 rp_ectl_2_r1;
@@ -932,11 +933,13 @@ static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
        afi_writel(pcie, 0, AFI_AXI_BAR5_SZ);
        afi_writel(pcie, 0, AFI_FPCI_BAR5);
 
-       /* map all upstream transactions as uncached */
-       afi_writel(pcie, 0, AFI_CACHE_BAR0_ST);
-       afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ);
-       afi_writel(pcie, 0, AFI_CACHE_BAR1_ST);
-       afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ);
+       if (pcie->soc->has_cache_bars) {
+               /* map all upstream transactions as uncached */
+               afi_writel(pcie, 0, AFI_CACHE_BAR0_ST);
+               afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ);
+               afi_writel(pcie, 0, AFI_CACHE_BAR1_ST);
+               afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ);
+       }
 
        /* MSI translations are setup only when needed */
        afi_writel(pcie, 0, AFI_MSI_FPCI_BAR_ST);
@@ -2460,6 +2463,7 @@ static const struct tegra_pcie_soc tegra20_pcie = {
        .program_deskew_time = false,
        .raw_violation_fixup = false,
        .update_fc_timer = false,
+       .has_cache_bars = true,
        .ectl.enable = false,
 };
 
@@ -2488,6 +2492,7 @@ static const struct tegra_pcie_soc tegra30_pcie = {
        .program_deskew_time = false,
        .raw_violation_fixup = false,
        .update_fc_timer = false,
+       .has_cache_bars = false,
        .ectl.enable = false,
 };
 
@@ -2511,6 +2516,7 @@ static const struct tegra_pcie_soc tegra124_pcie = {
        .program_deskew_time = false,
        .raw_violation_fixup = true,
        .update_fc_timer = false,
+       .has_cache_bars = false,
        .ectl.enable = false,
 };
 
@@ -2534,6 +2540,7 @@ static const struct tegra_pcie_soc tegra210_pcie = {
        .program_deskew_time = true,
        .raw_violation_fixup = false,
        .update_fc_timer = true,
+       .has_cache_bars = false,
        .ectl = {
                .regs = {
                        .rp_ectl_2_r1 = 0x0000000f,
@@ -2574,6 +2581,7 @@ static const struct tegra_pcie_soc tegra186_pcie = {
        .program_deskew_time = false,
        .raw_violation_fixup = false,
        .update_fc_timer = false,
+       .has_cache_bars = false,
        .ectl.enable = false,
 };