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SubjectRe: [PATCH 07/13] PCI: cadence: Add new *ops* for CPU addr fixup
On Mon, Dec 09, 2019 at 02:51:41PM +0530, Kishon Vijay Abraham I wrote:
> Cadence driver uses "mem" memory resource to obtain the offset of
> configuration space address region, memory space address region and
> message space address region. The obtained offset is used to program
> the Address Translation Unit (ATU). However certain platforms like TI's
> J721E SoC require the absolute address to be programmed in the ATU and not
> just the offset.
>
> The same problem was solved in designware driver using a platform specific
> ops for CPU addr fixup in commit a660083eb06c5bb0 ("PCI: dwc: designware:

Thanks for this reference, though this doesn't need to be in the commit
log, please put such comments underneath a ---.

> Add new *ops* for CPU addr fixup"). Follow a similar mechanism in
> Cadence too instead of directly using "mem" memory resource in Cadence
> PCIe core.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
> ---
> .../pci/controller/cadence/pcie-cadence-host.c | 15 ++++-----------
> drivers/pci/controller/cadence/pcie-cadence.c | 8 ++++++--
> drivers/pci/controller/cadence/pcie-cadence.h | 1 +
> 3 files changed, 11 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c
> index 2efc33b1cade..cf817be237af 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence-host.c
> +++ b/drivers/pci/controller/cadence/pcie-cadence-host.c
> @@ -105,15 +105,14 @@ static int cdns_pcie_host_init_root_port(struct cdns_pcie_rc *rc)
> static int cdns_pcie_host_init_address_translation(struct cdns_pcie_rc *rc)
> {
> struct cdns_pcie *pcie = &rc->pcie;
> - struct resource *mem_res = pcie->mem_res;
> struct resource *bus_range = rc->bus_range;
> struct resource *cfg_res = rc->cfg_res;
> struct device *dev = pcie->dev;
> struct device_node *np = dev->of_node;
> struct of_pci_range_parser parser;
> + u64 cpu_addr = cfg_res->start;
> struct of_pci_range range;
> u32 addr0, addr1, desc1;
> - u64 cpu_addr;
> int r, err;
>
> /*
> @@ -126,7 +125,9 @@ static int cdns_pcie_host_init_address_translation(struct cdns_pcie_rc *rc)
> cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR1(0), addr1);
> cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(0), desc1);
>
> - cpu_addr = cfg_res->start - mem_res->start;
> + if (pcie->ops->cpu_addr_fixup)
> + cpu_addr = pcie->ops->cpu_addr_fixup(pcie, cpu_addr);
> +

Won't this patch cause a breakage for existing users that won't have defined a
cpu_addr_fixup? The offset isn't being calculated and so cpu_addr will be wrong?

Thanks,

Andrew Murray

> addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(12) |
> (lower_32_bits(cpu_addr) & GENMASK(31, 8));
> addr1 = upper_32_bits(cpu_addr);
> @@ -264,14 +265,6 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
> }
> rc->cfg_res = res;
>
> - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
> - if (!res) {
> - dev_err(dev, "missing \"mem\"\n");
> - return -EINVAL;
> - }
> -
> - pcie->mem_res = res;
> -
> ret = cdns_pcie_start_link(pcie, true);
> if (ret) {
> dev_err(dev, "Failed to start link\n");
> diff --git a/drivers/pci/controller/cadence/pcie-cadence.c b/drivers/pci/controller/cadence/pcie-cadence.c
> index de5b3b06f2d0..bd93d0f92f55 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence.c
> +++ b/drivers/pci/controller/cadence/pcie-cadence.c
> @@ -113,7 +113,9 @@ void cdns_pcie_set_outbound_region(struct cdns_pcie *pcie, u8 fn,
> cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(r), desc1);
>
> /* Set the CPU address */
> - cpu_addr -= pcie->mem_res->start;
> + if (pcie->ops->cpu_addr_fixup)
> + cpu_addr = pcie->ops->cpu_addr_fixup(pcie, cpu_addr);
> +
> addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(nbits) |
> (lower_32_bits(cpu_addr) & GENMASK(31, 8));
> addr1 = upper_32_bits(cpu_addr);
> @@ -140,7 +142,9 @@ void cdns_pcie_set_outbound_region_for_normal_msg(struct cdns_pcie *pcie, u8 fn,
> }
>
> /* Set the CPU address */
> - cpu_addr -= pcie->mem_res->start;
> + if (pcie->ops->cpu_addr_fixup)
> + cpu_addr = pcie->ops->cpu_addr_fixup(pcie, cpu_addr);
> +
> addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(17) |
> (lower_32_bits(cpu_addr) & GENMASK(31, 8));
> addr1 = upper_32_bits(cpu_addr);
> diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
> index c879dd3d2893..ffa8b9f78ff8 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence.h
> +++ b/drivers/pci/controller/cadence/pcie-cadence.h
> @@ -233,6 +233,7 @@ struct cdns_pcie_ops {
> void (*write)(void __iomem *addr, int size, u32 value);
> int (*start_link)(struct cdns_pcie *pcie, bool start);
> bool (*is_link_up)(struct cdns_pcie *pcie);
> + u64 (*cpu_addr_fixup)(struct cdns_pcie *pcie, u64 cpu_addr);
> };
>
> /**
> --
> 2.17.1
>

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