[PATCH] PCI: tegra: Use pci_parse_request_of_pci_ranges()

[Rob Herring <robh@kernel.org>]

Convert Tegra PCI host driver to use the common
pci_parse_request_of_pci_ranges().

This allows removing the DT ranges parsing, PCI resource handling, and
private storage of resources from the driver.

Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Andrew Murray <andrew.murray@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: linux-tegra@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
---
Here's one more conversion to use pci_parse_request_of_pci_ranges. It's
dependent on my prior series, specifically this patch[1].

Compile tested only.

Rob

[1] https://patchwork.ozlabs.org/patch/1185555/

 drivers/pci/controller/pci-tegra.c | 187 +++++++----------------------
 1 file changed, 46 insertions(+), 141 deletions(-)

diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
index 673a1725ef38..83d8209a372a 100644
--- a/drivers/pci/controller/pci-tegra.c
+++ b/drivers/pci/controller/pci-tegra.c
@@ -355,16 +355,6 @@ struct tegra_pcie {
 	int irq;
 
 	struct resource cs;
-	struct resource io;
-	struct resource pio;
-	struct resource mem;
-	struct resource prefetch;
-	struct resource busn;
-
-	struct {
-		resource_size_t mem;
-		resource_size_t io;
-	} offset;
 
 	struct clk *pex_clk;
 	struct clk *afi_clk;
@@ -797,38 +787,6 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_relax_enable);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_relax_enable);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_relax_enable);
 
-static int tegra_pcie_request_resources(struct tegra_pcie *pcie)
-{
-	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
-	struct list_head *windows = &host->windows;
-	struct device *dev = pcie->dev;
-	int err;
-
-	pci_add_resource_offset(windows, &pcie->pio, pcie->offset.io);
-	pci_add_resource_offset(windows, &pcie->mem, pcie->offset.mem);
-	pci_add_resource_offset(windows, &pcie->prefetch, pcie->offset.mem);
-	pci_add_resource(windows, &pcie->busn);
-
-	err = devm_request_pci_bus_resources(dev, windows);
-	if (err < 0) {
-		pci_free_resource_list(windows);
-		return err;
-	}
-
-	pci_remap_iospace(&pcie->pio, pcie->io.start);
-
-	return 0;
-}
-
-static void tegra_pcie_free_resources(struct tegra_pcie *pcie)
-{
-	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
-	struct list_head *windows = &host->windows;
-
-	pci_unmap_iospace(&pcie->pio);
-	pci_free_resource_list(windows);
-}
-
 static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
 {
 	struct tegra_pcie *pcie = pdev->bus->sysdata;
@@ -909,36 +867,49 @@ static irqreturn_t tegra_pcie_isr(int irq, void *arg)
  */
 static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
 {
-	u32 fpci_bar, size, axi_address;
+	u32 size;
+	struct resource_entry *entry;
+	struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
 
 	/* Bar 0: type 1 extended configuration space */
 	size = resource_size(&pcie->cs);
 	afi_writel(pcie, pcie->cs.start, AFI_AXI_BAR0_START);
 	afi_writel(pcie, size >> 12, AFI_AXI_BAR0_SZ);
 
-	/* Bar 1: downstream IO bar */
-	fpci_bar = 0xfdfc0000;
-	size = resource_size(&pcie->io);
-	axi_address = pcie->io.start;
-	afi_writel(pcie, axi_address, AFI_AXI_BAR1_START);
-	afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ);
-	afi_writel(pcie, fpci_bar, AFI_FPCI_BAR1);
-
-	/* Bar 2: prefetchable memory BAR */
-	fpci_bar = (((pcie->prefetch.start >> 12) & 0x0fffffff) << 4) | 0x1;
-	size = resource_size(&pcie->prefetch);
-	axi_address = pcie->prefetch.start;
-	afi_writel(pcie, axi_address, AFI_AXI_BAR2_START);
-	afi_writel(pcie, size >> 12, AFI_AXI_BAR2_SZ);
-	afi_writel(pcie, fpci_bar, AFI_FPCI_BAR2);
-
-	/* Bar 3: non prefetchable memory BAR */
-	fpci_bar = (((pcie->mem.start >> 12) & 0x0fffffff) << 4) | 0x1;
-	size = resource_size(&pcie->mem);
-	axi_address = pcie->mem.start;
-	afi_writel(pcie, axi_address, AFI_AXI_BAR3_START);
-	afi_writel(pcie, size >> 12, AFI_AXI_BAR3_SZ);
-	afi_writel(pcie, fpci_bar, AFI_FPCI_BAR3);
+	resource_list_for_each_entry(entry, &bridge->windows) {
+		u32 fpci_bar, axi_address;
+		struct resource *res = entry->res;
+
+		size = resource_size(res);
+
+		switch (resource_type(res)) {
+		case IORESOURCE_IO:
+			/* Bar 1: downstream IO bar */
+			fpci_bar = 0xfdfc0000;
+			axi_address = pci_pio_to_address(res->start);
+			afi_writel(pcie, axi_address, AFI_AXI_BAR1_START);
+			afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ);
+			afi_writel(pcie, fpci_bar, AFI_FPCI_BAR1);
+			break;
+		case IORESOURCE_MEM:
+			fpci_bar = (((res->start >> 12) & 0x0fffffff) << 4) | 0x1;
+			axi_address = res->start;
+
+			if (res->flags & IORESOURCE_PREFETCH) {
+				/* Bar 2: prefetchable memory BAR */
+				afi_writel(pcie, axi_address, AFI_AXI_BAR2_START);
+				afi_writel(pcie, size >> 12, AFI_AXI_BAR2_SZ);
+				afi_writel(pcie, fpci_bar, AFI_FPCI_BAR2);
+
+			} else {
+				/* Bar 3: non prefetchable memory BAR */
+				afi_writel(pcie, axi_address, AFI_AXI_BAR3_START);
+				afi_writel(pcie, size >> 12, AFI_AXI_BAR3_SZ);
+				afi_writel(pcie, fpci_bar, AFI_FPCI_BAR3);
+			}
+			break;
+		}
+	}
 
 	/* NULL out the remaining BARs as they are not used */
 	afi_writel(pcie, 0, AFI_AXI_BAR4_START);
@@ -2157,76 +2128,10 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
 	struct device *dev = pcie->dev;
 	struct device_node *np = dev->of_node, *port;
 	const struct tegra_pcie_soc *soc = pcie->soc;
-	struct of_pci_range_parser parser;
-	struct of_pci_range range;
 	u32 lanes = 0, mask = 0;
 	unsigned int lane = 0;
-	struct resource res;
 	int err;
 
-	if (of_pci_range_parser_init(&parser, np)) {
-		dev_err(dev, "missing \"ranges\" property\n");
-		return -EINVAL;
-	}
-
-	for_each_of_pci_range(&parser, &range) {
-		err = of_pci_range_to_resource(&range, np, &res);
-		if (err < 0)
-			return err;
-
-		switch (res.flags & IORESOURCE_TYPE_BITS) {
-		case IORESOURCE_IO:
-			/* Track the bus -> CPU I/O mapping offset. */
-			pcie->offset.io = res.start - range.pci_addr;
-
-			memcpy(&pcie->pio, &res, sizeof(res));
-			pcie->pio.name = np->full_name;
-
-			/*
-			 * The Tegra PCIe host bridge uses this to program the
-			 * mapping of the I/O space to the physical address,
-			 * so we override the .start and .end fields here that
-			 * of_pci_range_to_resource() converted to I/O space.
-			 * We also set the IORESOURCE_MEM type to clarify that
-			 * the resource is in the physical memory space.
-			 */
-			pcie->io.start = range.cpu_addr;
-			pcie->io.end = range.cpu_addr + range.size - 1;
-			pcie->io.flags = IORESOURCE_MEM;
-			pcie->io.name = "I/O";
-
-			memcpy(&res, &pcie->io, sizeof(res));
-			break;
-
-		case IORESOURCE_MEM:
-			/*
-			 * Track the bus -> CPU memory mapping offset. This
-			 * assumes that the prefetchable and non-prefetchable
-			 * regions will be the last of type IORESOURCE_MEM in
-			 * the ranges property.
-			 * */
-			pcie->offset.mem = res.start - range.pci_addr;
-
-			if (res.flags & IORESOURCE_PREFETCH) {
-				memcpy(&pcie->prefetch, &res, sizeof(res));
-				pcie->prefetch.name = "prefetchable";
-			} else {
-				memcpy(&pcie->mem, &res, sizeof(res));
-				pcie->mem.name = "non-prefetchable";
-			}
-			break;
-		}
-	}
-
-	err = of_pci_parse_bus_range(np, &pcie->busn);
-	if (err < 0) {
-		dev_err(dev, "failed to parse ranges property: %d\n", err);
-		pcie->busn.name = np->name;
-		pcie->busn.start = 0;
-		pcie->busn.end = 0xff;
-		pcie->busn.flags = IORESOURCE_BUS;
-	}
-
 	/* parse root ports */
 	for_each_child_of_node(np, port) {
 		struct tegra_pcie_port *rp;
@@ -2766,6 +2671,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 	struct pci_host_bridge *host;
 	struct tegra_pcie *pcie;
 	struct pci_bus *child;
+	struct resource *bus;
 	int err;
 
 	host = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
@@ -2780,6 +2686,12 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 	INIT_LIST_HEAD(&pcie->ports);
 	pcie->dev = dev;
 
+	err = pci_parse_request_of_pci_ranges(dev, &host->windows, NULL, &bus);
+	if (err) {
+		dev_err(dev, "Getting bridge resources failed\n");
+		return err;
+	}
+
 	err = tegra_pcie_parse_dt(pcie);
 	if (err < 0)
 		return err;
@@ -2803,11 +2715,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 		goto teardown_msi;
 	}
 
-	err = tegra_pcie_request_resources(pcie);
-	if (err)
-		goto pm_runtime_put;
-
-	host->busnr = pcie->busn.start;
+	host->busnr = bus->start;
 	host->dev.parent = &pdev->dev;
 	host->ops = &tegra_pcie_ops;
 	host->map_irq = tegra_pcie_map_irq;
@@ -2816,7 +2724,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 	err = pci_scan_root_bus_bridge(host);
 	if (err < 0) {
 		dev_err(dev, "failed to register host: %d\n", err);
-		goto free_resources;
+		goto pm_runtime_put;
 	}
 
 	pci_bus_size_bridges(host->bus);
@@ -2835,8 +2743,6 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 
 	return 0;
 
-free_resources:
-	tegra_pcie_free_resources(pcie);
 pm_runtime_put:
 	pm_runtime_put_sync(pcie->dev);
 	pm_runtime_disable(pcie->dev);
@@ -2858,7 +2764,6 @@ static int tegra_pcie_remove(struct platform_device *pdev)
 
 	pci_stop_root_bus(host->bus);
 	pci_remove_root_bus(host->bus);
-	tegra_pcie_free_resources(pcie);
 	pm_runtime_put_sync(pcie->dev);
 	pm_runtime_disable(pcie->dev);
 
-- 
2.20.1