linux-kernel - [PATCH v2 2/4] PCI: cadence: Use "dma-ranges" instead of "cdns,no-bar-match-nbits" property

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Date:   Fri, 17 Apr 2020 17:13:20 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Tom Joseph <tjoseph@...ence.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>
CC:     <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 2/4] PCI: cadence: Use "dma-ranges" instead of "cdns,no-bar-match-nbits" property

Cadence PCIe core driver (host mode) uses "cdns,no-bar-match-nbits"
property to configure the number of bits passed through from PCIe
address to internal address in Inbound Address Translation register.

However standard PCI dt-binding already defines "dma-ranges" to
describe the address range accessible by PCIe controller. Parse
"dma-ranges" property to configure the number of bits passed
through from PCIe address to internal address in Inbound Address
Translation register.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/pci/controller/cadence/pcie-cadence-host.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c
index 9b1c3966414b..60f912a657b9 100644
--- a/drivers/pci/controller/cadence/pcie-cadence-host.c
+++ b/drivers/pci/controller/cadence/pcie-cadence-host.c
@@ -206,8 +206,10 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
 	struct device *dev = rc->pcie.dev;
 	struct platform_device *pdev = to_platform_device(dev);
 	struct device_node *np = dev->of_node;
+	struct of_pci_range_parser parser;
 	struct pci_host_bridge *bridge;
 	struct list_head resources;
+	struct of_pci_range range;
 	struct cdns_pcie *pcie;
 	struct resource *res;
 	int ret;
@@ -222,8 +224,15 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
 	rc->max_regions = 32;
 	of_property_read_u32(np, "cdns,max-outbound-regions", &rc->max_regions);
 
-	rc->no_bar_nbits = 32;
-	of_property_read_u32(np, "cdns,no-bar-match-nbits", &rc->no_bar_nbits);
+	if (!of_pci_dma_range_parser_init(&parser, np))
+		if (of_pci_range_parser_one(&parser, &range))
+			rc->no_bar_nbits = ilog2(range.size);
+
+	if (!rc->no_bar_nbits) {
+		rc->no_bar_nbits = 32;
+		of_property_read_u32(np, "cdns,no-bar-match-nbits",
+				     &rc->no_bar_nbits);
+	}
 
 	rc->vendor_id = 0xffff;
 	of_property_read_u16(np, "vendor-id", &rc->vendor_id);
-- 
2.17.1