PCI: dwc: Add upper limit address for outbound iATU

The size parameter is unsigned long type which can accept size > 4GB. In
that case, the upper limit address must be programmed. Add support to
program the upper limit address and set INCREASE_REGION_SIZE in case size >
4GB.

Link: https://lore.kernel.org/r/1612250918-19610-1-git-send-email-shradha.t@samsung.com
Signed-off-by: Shradha Todi <shradha.t@samsung.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Reviewed-by: Rob Herring <robh@kernel.org>

diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index e7b9a7d..fb63783 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -333,11 +333,16 @@ static void __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
                           upper_32_bits(cpu_addr));
        dw_pcie_writel_dbi(pci, PCIE_ATU_LIMIT,
                           lower_32_bits(cpu_addr + size - 1));
+       if (pci->version >= 0x460A)
+               dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_LIMIT,
+                                  upper_32_bits(cpu_addr + size - 1));
        dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET,
                           lower_32_bits(pci_addr));
        dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET,
                           upper_32_bits(pci_addr));
        val = type | PCIE_ATU_FUNC_NUM(func_no);
+       val = ((upper_32_bits(size - 1)) && (pci->version >= 0x460A)) ?
+               val | PCIE_ATU_INCREASE_REGION_SIZE : val;
        if (pci->version == 0x490A)
                val = dw_pcie_enable_ecrc(val);
        dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, val);

diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index d8d2e0a..7247c8b 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -100,6 +100,7 @@
 #define PCIE_ATU_DEV(x)                        FIELD_PREP(GENMASK(23, 19), x)
 #define PCIE_ATU_FUNC(x)               FIELD_PREP(GENMASK(18, 16), x)
 #define PCIE_ATU_UPPER_TARGET          0x91C
+#define PCIE_ATU_UPPER_LIMIT           0x924
 
 #define PCIE_MISC_CONTROL_1_OFF                0x8BC
 #define PCIE_DBI_RO_WR_EN              BIT(0)