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Subject[PATCH 1/1] PCI: iproc: Invalidate PAXB address mapping before programming it
Date
Invalidate PAXB inbound/outbound address mapping each time before
programming it. This is helpful for the cases where we need to
reprogram inbound/outbound address mapping without resetting PAXB.
kexec kernel is one such example.

Signed-off-by: Abhishek Shah <abhishek.shah@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Reviewed-by: Vikram Mysore Prakash <vikram.prakash@broadcom.com>
---
drivers/pci/controller/pcie-iproc.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)

diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
index e3ca46497470..99a9521ba7ab 100644
--- a/drivers/pci/controller/pcie-iproc.c
+++ b/drivers/pci/controller/pcie-iproc.c
@@ -1245,6 +1245,32 @@ static int iproc_pcie_map_dma_ranges(struct iproc_pcie *pcie)
return ret;
}

+static void iproc_pcie_invalidate_mapping(struct iproc_pcie *pcie)
+{
+ struct iproc_pcie_ib *ib = &pcie->ib;
+ struct iproc_pcie_ob *ob = &pcie->ob;
+ int idx;
+
+ if (pcie->ep_is_internal)
+ return;
+
+ if (pcie->need_ob_cfg) {
+ /* iterate through all OARR mapping regions */
+ for (idx = ob->nr_windows - 1; idx >= 0; idx--) {
+ iproc_pcie_write_reg(pcie,
+ MAP_REG(IPROC_PCIE_OARR0, idx), 0);
+ }
+ }
+
+ if (pcie->need_ib_cfg) {
+ /* iterate through all IARR mapping regions */
+ for (idx = 0; idx < ib->nr_regions; idx++) {
+ iproc_pcie_write_reg(pcie,
+ MAP_REG(IPROC_PCIE_IARR0, idx), 0);
+ }
+ }
+}
+
static int iproce_pcie_get_msi(struct iproc_pcie *pcie,
struct device_node *msi_node,
u64 *msi_addr)
@@ -1517,6 +1543,8 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
iproc_pcie_perst_ctrl(pcie, true);
iproc_pcie_perst_ctrl(pcie, false);

+ iproc_pcie_invalidate_mapping(pcie);
+
if (pcie->need_ob_cfg) {
ret = iproc_pcie_map_ranges(pcie, res);
if (ret) {
--
2.17.1
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