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Date: Tue, 10 Nov 2015 09:46:19 +0900
From: Simon Horman <horms@...ge.net.au>
To: Phil Edworthy <phil.edworthy@...esas.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Wolfram Sang <wsa@...-dreams.de>
Subject: Re: [PATCH 1/3 v2] PCI: pcie-rcar: Convert to DT resource parsing API
On Mon, Nov 09, 2015 at 10:26:39AM +0000, Phil Edworthy wrote:
> The main purpose of this change is to avoid calling pci_ioremap_io() as
> this is not available on arm64. However, instead of doing the range passing
> in this driver we can utilise of_pci_get_host_bridge_resources().
>
> This is similar to changes made to the generic PCI host driver in commit
> dbf9826d "PCI: generic: Convert to DT resource parsing API".
>
> Signed-off-by: Phil Edworthy <phil.edworthy@...esas.com>
I think the following should be carried over from v1:
Reported-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Bjorn, I know there have been a few false starts with regards
to recent pcie-rcar changes. But some more rigor has been applied to this
one. Please consider applying it.
Acked-by: Simon Horman <horms+renesas@...ge.net.au>
> ---
> v2:
> - Remove incorrect res_valid check
> ---
> drivers/pci/host/pcie-rcar.c | 116 +++++++++++++++++++++++++++----------------
> 1 file changed, 73 insertions(+), 43 deletions(-)
>
> diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
> index 6a3a612..c977fa6 100644
> --- a/drivers/pci/host/pcie-rcar.c
> +++ b/drivers/pci/host/pcie-rcar.c
> @@ -108,8 +108,6 @@
> #define RCAR_PCI_MAX_RESOURCES 4
> #define MAX_NR_INBOUND_MAPS 6
>
> -static unsigned long global_io_offset;
> -
> struct rcar_msi {
> DECLARE_BITMAP(used, INT_PCI_MSI_NR);
> struct irq_domain *domain;
> @@ -138,8 +136,7 @@ struct rcar_pcie {
> #endif
> struct device *dev;
> void __iomem *base;
> - struct resource res[RCAR_PCI_MAX_RESOURCES];
> - struct resource busn;
> + struct list_head resources;
> int root_bus_nr;
> struct clk *clk;
> struct clk *bus_clk;
> @@ -323,10 +320,9 @@ static struct pci_ops rcar_pcie_ops = {
> .write = rcar_pcie_write_conf,
> };
>
> -static void rcar_pcie_setup_window(int win, struct rcar_pcie *pcie)
> +static void rcar_pcie_setup_window(int win, struct rcar_pcie *pcie,
> + struct resource *res)
> {
> - struct resource *res = &pcie->res[win];
> -
> /* Setup PCIe address space mappings for each resource */
> resource_size_t size;
> resource_size_t res_start;
> @@ -359,31 +355,33 @@ static void rcar_pcie_setup_window(int win, struct rcar_pcie *pcie)
> rcar_pci_write_reg(pcie, mask, PCIEPTCTLR(win));
> }
>
> -static int rcar_pcie_setup(struct list_head *resource, struct rcar_pcie *pcie)
> +static int rcar_pcie_setup(struct list_head *resource, struct rcar_pcie *pci)
> {
> - struct resource *res;
> - int i;
> -
> - pcie->root_bus_nr = pcie->busn.start;
> + struct resource_entry *win;
> + int i = 0;
>
> /* Setup PCI resources */
> - for (i = 0; i < RCAR_PCI_MAX_RESOURCES; i++) {
> + resource_list_for_each_entry(win, &pci->resources) {
> + struct resource *res = win->res;
>
> - res = &pcie->res[i];
> if (!res->flags)
> continue;
>
> - rcar_pcie_setup_window(i, pcie);
> -
> - if (res->flags & IORESOURCE_IO) {
> - phys_addr_t io_start = pci_pio_to_address(res->start);
> - pci_ioremap_io(global_io_offset, io_start);
> - global_io_offset += SZ_64K;
> + switch (resource_type(res)) {
> + case IORESOURCE_IO:
> + case IORESOURCE_MEM:
> + rcar_pcie_setup_window(i, pci, res);
> + i++;
> + break;
> + case IORESOURCE_BUS:
> + pci->root_bus_nr = res->start;
> + break;
> + default:
> + continue;
> }
>
> pci_add_resource(resource, res);
> }
> - pci_add_resource(resource, &pcie->busn);
>
> return 1;
> }
> @@ -923,14 +921,63 @@ static const struct of_device_id rcar_pcie_of_match[] = {
> };
> MODULE_DEVICE_TABLE(of, rcar_pcie_of_match);
>
> +static void rcar_pcie_release_of_pci_ranges(struct rcar_pcie *pci)
> +{
> + pci_free_resource_list(&pci->resources);
> +}
> +
> +static int rcar_pcie_parse_request_of_pci_ranges(struct rcar_pcie *pci)
> +{
> + int err;
> + struct device *dev = pci->dev;
> + struct device_node *np = dev->of_node;
> + resource_size_t iobase;
> + struct resource_entry *win;
> +
> + err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pci->resources, &iobase);
> + if (err)
> + return err;
> +
> + resource_list_for_each_entry(win, &pci->resources) {
> + struct resource *parent, *res = win->res;
> +
> + switch (resource_type(res)) {
> + case IORESOURCE_IO:
> + parent = &ioport_resource;
> + err = pci_remap_iospace(res, iobase);
> + if (err) {
> + dev_warn(dev, "error %d: failed to map resource %pR\n",
> + err, res);
> + continue;
> + }
> + break;
> + case IORESOURCE_MEM:
> + parent = &iomem_resource;
> + break;
> +
> + case IORESOURCE_BUS:
> + default:
> + continue;
> + }
> +
> + err = devm_request_resource(dev, parent, res);
> + if (err)
> + goto out_release_res;
> + }
> +
> + return 0;
> +
> +out_release_res:
> + rcar_pcie_release_of_pci_ranges(pci);
> + return err;
> +}
> +
> static int rcar_pcie_probe(struct platform_device *pdev)
> {
> struct rcar_pcie *pcie;
> unsigned int data;
> - struct of_pci_range range;
> - struct of_pci_range_parser parser;
> const struct of_device_id *of_id;
> - int err, win = 0;
> + int err;
> int (*hw_init_fn)(struct rcar_pcie *);
>
> pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
> @@ -940,16 +987,9 @@ static int rcar_pcie_probe(struct platform_device *pdev)
> pcie->dev = &pdev->dev;
> platform_set_drvdata(pdev, pcie);
>
> - /* Get the bus range */
> - if (of_pci_parse_bus_range(pdev->dev.of_node, &pcie->busn)) {
> - dev_err(&pdev->dev, "failed to parse bus-range property\n");
> - return -EINVAL;
> - }
> + INIT_LIST_HEAD(&pcie->resources);
>
> - if (of_pci_range_parser_init(&parser, pdev->dev.of_node)) {
> - dev_err(&pdev->dev, "missing ranges property\n");
> - return -EINVAL;
> - }
> + rcar_pcie_parse_request_of_pci_ranges(pcie);
>
> err = rcar_pcie_get_resources(pdev, pcie);
> if (err < 0) {
> @@ -957,16 +997,6 @@ static int rcar_pcie_probe(struct platform_device *pdev)
> return err;
> }
>
> - for_each_of_pci_range(&parser, &range) {
> - err = of_pci_range_to_resource(&range, pdev->dev.of_node,
> - &pcie->res[win++]);
> - if (err < 0)
> - return err;
> -
> - if (win > RCAR_PCI_MAX_RESOURCES)
> - break;
> - }
> -
> err = rcar_pcie_parse_map_dma_ranges(pcie, pdev->dev.of_node);
> if (err)
> return err;
> --
> 1.9.1
>
--
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