Hi Zhou & Gabriele,
On Fri, Oct 16, 2015 at 06:23:36PM +0800, Zhou Wang wrote:
> From: gabriele paoloni <gabriele.paoloni@xxxxxxxxxx>
>
> Commit f4c55c5a3f7f ("PCI: designware: Program ATU with untranslated
> address") added the calculation of PCI BUS addresses in designware,
> storing them in new fields added in "struct pcie_port". This
> calculation is done for every designware user even if is only
> applicable to DRA7xx.
> This patch moves the calculation of the bus addresses to the DRA7xx
> driver and is needed to allow the rework of designware to use
> the new DT parsing API.
>
> Signed-off-by: Gabriele Paoloni <gabriele.paoloni@xxxxxxxxxx>
> Signed-off-by: Zhou Wang <wangzhou1@xxxxxxxxxxxxx>
> Acked-by: Pratyush Anand <pratyush.anand@xxxxxxxxx>
> ---
> drivers/pci/host/pci-dra7xx.c | 13 +++++++++++++
> drivers/pci/host/pcie-designware.c | 15 ++++-----------
> 2 files changed, 17 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
> index 199e29a..ebdffa0 100644
> --- a/drivers/pci/host/pci-dra7xx.c
> +++ b/drivers/pci/host/pci-dra7xx.c
> @@ -62,6 +62,7 @@
>
> #define PCIECTRL_DRA7XX_CONF_PHY_CS 0x010C
> #define LINK_UP BIT(16)
> +#define CPU_TO_BUS_ADDR 0x0FFFFFFF
"CPU_TO_BUS_ADDR" is a very generic name. Since you do have DRA7XX in
other #defines and static symbols in this file, maybe it could be DRA7XX to
make it obvious that it only applies here?
>
> struct dra7xx_pcie {
> void __iomem *base;
> @@ -151,6 +152,18 @@ static void dra7xx_pcie_enable_interrupts(struct pcie_port *pp)
> static void dra7xx_pcie_host_init(struct pcie_port *pp)
> {
> dw_pcie_setup_rc(pp);
> +
> + if (pp->io_mod_base)
> + pp->io_mod_base &= CPU_TO_BUS_ADDR;
These are equivalent to
pp->io_mod_base &= CPU_TO_BUS_ADDR;
(You don't need to test whether they're zero first.)
> +
> + if (pp->mem_mod_base)
> + pp->mem_mod_base &= CPU_TO_BUS_ADDR;
> +
> + if (pp->cfg0_mod_base) {
> + pp->cfg0_mod_base &= CPU_TO_BUS_ADDR;
> + pp->cfg1_mod_base &= CPU_TO_BUS_ADDR;
> + }
> +
> dra7xx_pcie_establish_link(pp);
> if (IS_ENABLED(CONFIG_PCI_MSI))
> dw_pcie_msi_init(pp);
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index 52aa6e3..75338a6 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -365,14 +365,10 @@ int dw_pcie_host_init(struct pcie_port *pp)
> struct of_pci_range range;
> struct of_pci_range_parser parser;
> struct resource *cfg_res;
> - u32 val, na, ns;
> + u32 val, ns;
> const __be32 *addrp;
> int i, index, ret;
>
> - /* Find the address cell size and the number of cells in order to get
> - * the untranslated address.
> - */
> - of_property_read_u32(np, "#address-cells", &na);
> ns = of_n_size_cells(np);
>
> cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
> @@ -415,8 +411,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
> pp->io_base = range.cpu_addr;
>
> /* Find the untranslated IO space address */
> - pp->io_mod_base = of_read_number(parser.range -
> - parser.np + na, ns);
> + pp->io_mod_base = range.cpu_addr;
So apparently
"of_read_number() == range.cpu_addr & CPU_TO_BUS_ADDR" on DRA7xx
"of_read_number() == range.cpu_addr" everywhere else?
Is that right? Is that a valid assumption, i.e., are we assuming
anything about DTs in the field that we shouldn't?
> }
> if (restype == IORESOURCE_MEM) {
> of_pci_range_to_resource(&range, np, &pp->mem);
> @@ -425,8 +420,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
> pp->mem_bus_addr = range.pci_addr;
>
> /* Find the untranslated MEM space address */
> - pp->mem_mod_base = of_read_number(parser.range -
> - parser.np + na, ns);
> + pp->mem_mod_base = range.cpu_addr;
> }
> if (restype == 0) {
> of_pci_range_to_resource(&range, np, &pp->cfg);
> @@ -436,8 +430,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
> pp->cfg1_base = pp->cfg.start + pp->cfg0_size;
>
> /* Find the untranslated configuration space address */
> - pp->cfg0_mod_base = of_read_number(parser.range -
> - parser.np + na, ns);
> + pp->cfg0_mod_base = range.cpu_addr;
> pp->cfg1_mod_base = pp->cfg0_mod_base +
> pp->cfg0_size;
> }
> --
> 1.9.1
>
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