Use ATU region-3 to setup mapping for prefetchable memory region. It also
modifies the code to consume an ATU region for mapping non-prefetchable or
prefetchable memory regions only if the CPU address and PCIe bus addresses
are not equal as there is no need to use ATU mapping if there is a 1:1
mapping between CPU address and PCIe bus address.
Signed-off-by: Vidya Sagar <vidyas@xxxxxxxxxx>
---
.../pci/controller/dwc/pcie-designware-host.c | 20 ++++++++++++++++---
drivers/pci/controller/dwc/pcie-designware.c | 6 ++++--
drivers/pci/controller/dwc/pcie-designware.h | 4 +++-
3 files changed, 24 insertions(+), 6 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 6f06d6bd9f00..cd3b52c93f05 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -701,13 +701,27 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
* we should not program the ATU here.
*/
if (!pp->ops->rd_other_conf) {
- dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX0,
- PCIE_ATU_TYPE_MEM, pp->mem_base,
- pp->mem_bus_addr, pp->mem_size);
+ if (pp->mem_base != pp->mem_bus_addr) {
+ dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX0,
+ PCIE_ATU_TYPE_MEM,
+ pp->mem_base,
+ pp->mem_bus_addr,
+ pp->mem_size);
+ }
if (pci->num_viewport > 2)
dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX2,
PCIE_ATU_TYPE_IO, pp->io_base,
pp->io_bus_addr, pp->io_size);
+ if (pp->prefetch_base != pp->perfetch_bus_addr &&
+ pci->num_viewport >= 4) {
+ dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX3,
+ PCIE_ATU_TYPE_MEM,
+ pp->prefetch_base,
+ pp->perfetch_bus_addr,
+ pp->prefetch_size);
+ } else {
+ dev_warn(pci->dev, "Insufficient ATU regions to map Prefetchable memory\n");
+ }
}
dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index c92496e36fd5..87f0ab8eb954 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -241,7 +241,7 @@ static void dw_pcie_writel_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg,
static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, int index,
int type, u64 cpu_addr,
- u64 pci_addr, u32 size)
+ u64 pci_addr, u64 size)
{
u32 retries, val;
u64 limit_addr = cpu_addr + size - 1;
@@ -259,6 +259,8 @@ static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, int index,
dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
upper_32_bits(pci_addr));
dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1,
+ upper_32_bits(size - 1) ?
+ type | PCIE_ATU_INCREASE_REGION_SIZE :
type);
dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
PCIE_ATU_ENABLE);
@@ -279,7 +281,7 @@ static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, int index,
}
void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
- u64 cpu_addr, u64 pci_addr, u32 size)
+ u64 cpu_addr, u64 pci_addr, u64 size)
{
u32 retries, val;
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index c87c1b2a1177..5c21b6732755 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -72,10 +72,12 @@
#define PCIE_ATU_VIEWPORT 0x900
#define PCIE_ATU_REGION_INBOUND BIT(31)
#define PCIE_ATU_REGION_OUTBOUND 0
+#define PCIE_ATU_REGION_INDEX3 0x3
#define PCIE_ATU_REGION_INDEX2 0x2
#define PCIE_ATU_REGION_INDEX1 0x1
#define PCIE_ATU_REGION_INDEX0 0x0
#define PCIE_ATU_CR1 0x904
+#define PCIE_ATU_INCREASE_REGION_SIZE BIT(13)
#define PCIE_ATU_TYPE_MEM 0x0
#define PCIE_ATU_TYPE_IO 0x2
#define PCIE_ATU_TYPE_CFG0 0x4
@@ -294,7 +296,7 @@ void dw_pcie_link_set_n_fts(struct dw_pcie *pci, u32 n_fts);
int dw_pcie_wait_for_link(struct dw_pcie *pci);
void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
int type, u64 cpu_addr, u64 pci_addr,
- u32 size);
+ u64 size);
int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar,
u64 cpu_addr, enum dw_pcie_as_type as_type);
void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
--
2.17.1
