PCI: xgene: Use pci_parse_request_of_pci_ranges()

Convert the xgene host bridge to use the common
pci_parse_request_of_pci_ranges().

There's no need to assign the resources to a temporary list first. Just
use bridge->windows directly and remove all the temporary list handling.

Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Toan Le <toan@os.amperecomputing.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Andrew Murray <andrew.murray@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/controller/pci-xgene.c b/drivers/pci/controller/pci-xgene.c
index ffda3e8..7d0f039 100644 (file)
--- a/drivers/pci/controller/pci-xgene.c
+++ b/drivers/pci/controller/pci-xgene.c
@@ -405,15 +405,13 @@ static void xgene_pcie_setup_cfg_reg(struct xgene_pcie_port *port)
        xgene_pcie_writel(port, CFGCTL, EN_REG);
 }
 
-static int xgene_pcie_map_ranges(struct xgene_pcie_port *port,
-                                struct list_head *res,
-                                resource_size_t io_base)
+static int xgene_pcie_map_ranges(struct xgene_pcie_port *port)
 {
+       struct pci_host_bridge *bridge = pci_host_bridge_from_priv(port);
        struct resource_entry *window;
        struct device *dev = port->dev;
-       int ret;
 
-       resource_list_for_each_entry(window, res) {
+       resource_list_for_each_entry(window, &bridge->windows) {
                struct resource *res = window->res;
                u64 restype = resource_type(res);
 
@@ -421,11 +419,9 @@ static int xgene_pcie_map_ranges(struct xgene_pcie_port *port,
 
                switch (restype) {
                case IORESOURCE_IO:
-                       xgene_pcie_setup_ob_reg(port, res, OMR3BARL, io_base,
+                       xgene_pcie_setup_ob_reg(port, res, OMR3BARL,
+                                               pci_pio_to_address(res->start),
                                                res->start - window->offset);
-                       ret = devm_pci_remap_iospace(dev, res, io_base);
-                       if (ret < 0)
-                               return ret;
                        break;
                case IORESOURCE_MEM:
                        if (res->flags & IORESOURCE_PREFETCH)
@@ -567,8 +563,7 @@ static void xgene_pcie_clear_config(struct xgene_pcie_port *port)
                xgene_pcie_writel(port, i, 0);
 }
 
-static int xgene_pcie_setup(struct xgene_pcie_port *port, struct list_head *res,
-                           resource_size_t io_base)
+static int xgene_pcie_setup(struct xgene_pcie_port *port)
 {
        struct device *dev = port->dev;
        u32 val, lanes = 0, speed = 0;
@@ -580,7 +575,7 @@ static int xgene_pcie_setup(struct xgene_pcie_port *port, struct list_head *res,
        val = (XGENE_PCIE_DEVICEID << 16) | XGENE_PCIE_VENDORID;
        xgene_pcie_writel(port, BRIDGE_CFG_0, val);
 
-       ret = xgene_pcie_map_ranges(port, res, io_base);
+       ret = xgene_pcie_map_ranges(port);
        if (ret)
                return ret;
 
@@ -607,11 +602,9 @@ static int xgene_pcie_probe(struct platform_device *pdev)
        struct device *dev = &pdev->dev;
        struct device_node *dn = dev->of_node;
        struct xgene_pcie_port *port;
-       resource_size_t iobase = 0;
        struct pci_bus *bus, *child;
        struct pci_host_bridge *bridge;
        int ret;
-       LIST_HEAD(res);
 
        bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port));
        if (!bridge)
@@ -634,20 +627,14 @@ static int xgene_pcie_probe(struct platform_device *pdev)
        if (ret)
                return ret;
 
-       ret = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, &res,
-                                                   &iobase);
+       ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows, NULL);
        if (ret)
                return ret;
 
-       ret = devm_request_pci_bus_resources(dev, &res);
-       if (ret)
-               goto error;
-
-       ret = xgene_pcie_setup(port, &res, iobase);
+       ret = xgene_pcie_setup(port);
        if (ret)
-               goto error;
+               return ret;
 
-       list_splice_init(&res, &bridge->windows);
        bridge->dev.parent = dev;
        bridge->sysdata = port;
        bridge->busnr = 0;
@@ -657,7 +644,7 @@ static int xgene_pcie_probe(struct platform_device *pdev)
 
        ret = pci_scan_root_bus_bridge(bridge);
        if (ret < 0)
-               goto error;
+               return ret;
 
        bus = bridge->bus;
 
@@ -666,10 +653,6 @@ static int xgene_pcie_probe(struct platform_device *pdev)
                pcie_bus_configure_settings(child);
        pci_bus_add_devices(bus);
        return 0;
-
-error:
-       pci_free_resource_list(&res);
-       return ret;
 }
 
 static const struct of_device_id xgene_pcie_match_table[] = {