linux-kernel - [PATCH 1/2] PCI: dwc: Add support to handle prefetchable memory separately

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Date:   Tue, 2 Jun 2020 15:39:39 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <amurray@...goodpenguin.co.uk>, <robh@...nel.org>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>
CC:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kthota@...dia.com>, <mmaddireddy@...dia.com>, <vidyas@...dia.com>,
        <sagar.tv@...il.com>
Subject: [PATCH 1/2] PCI: dwc: Add support to handle prefetchable memory separately

Add required structure members to struct pcie_port to handle prefetchable
memory aperture separately from non-prefetchable memory aperture so that
any dependency on the order of their appearance in the 'ranges' property
of the respective PCIe device tree node can be removed.

Signed-off-by: Vidya Sagar <vidyas@...dia.com>
---
 .../pci/controller/dwc/pcie-designware-host.c | 26 ++++++++++++-------
 drivers/pci/controller/dwc/pcie-designware.h  |  4 +++
 2 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 42fbfe2a1b8f..6f06d6bd9f00 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -363,13 +363,23 @@ int dw_pcie_host_init(struct pcie_port *pp)
 			pp->io_base = pci_pio_to_address(pp->io->start);
 			break;
 		case IORESOURCE_MEM:
-			pp->mem = win->res;
-			pp->mem->name = "MEM";
-			mem_size = resource_size(pp->mem);
-			if (upper_32_bits(mem_size))
-				dev_warn(dev, "MEM resource size exceeds max for 32 bits\n");
-			pp->mem_size = mem_size;
-			pp->mem_bus_addr = pp->mem->start - win->offset;
+			if (win->res->flags & IORESOURCE_PREFETCH) {
+				pp->prefetch = win->res;
+				pp->prefetch->name = "PREFETCH";
+				pp->prefetch_base = pp->prefetch->start;
+				pp->prefetch_size = resource_size(pp->prefetch);
+				pp->perfetch_bus_addr = pp->prefetch->start -
+							win->offset;
+			} else {
+				pp->mem = win->res;
+				pp->mem->name = "MEM";
+				pp->mem_base = pp->mem->start;
+				mem_size = resource_size(pp->mem);
+				if (upper_32_bits(mem_size))
+					dev_warn(dev, "MEM resource size exceeds max for 32 bits\n");
+				pp->mem_size = mem_size;
+				pp->mem_bus_addr = pp->mem->start - win->offset;
+			}
 			break;
 		case 0:
 			pp->cfg = win->res;
@@ -394,8 +404,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
 		}
 	}
 
-	pp->mem_base = pp->mem->start;
-
 	if (!pp->va_cfg0_base) {
 		pp->va_cfg0_base = devm_pci_remap_cfgspace(dev,
 					pp->cfg0_base, pp->cfg0_size);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 656e00f8fbeb..c87c1b2a1177 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -186,9 +186,13 @@ struct pcie_port {
 	u64			mem_base;
 	phys_addr_t		mem_bus_addr;
 	u32			mem_size;
+	u64			prefetch_base;
+	phys_addr_t		perfetch_bus_addr;
+	u64			prefetch_size;
 	struct resource		*cfg;
 	struct resource		*io;
 	struct resource		*mem;
+	struct resource		*prefetch;
 	struct resource		*busn;
 	int			irq;
 	const struct dw_pcie_host_ops *ops;
-- 
2.17.1