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Date: Wed, 20 Dec 2017 11:22:10 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Niklas Cassel <niklas.cassel@...s.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Niklas Cassel <niklass@...s.com>,
Jesper Nilsson <jespern@...s.com>,
Jingoo Han <jingoohan1@...il.com>,
Joao Pinto <Joao.Pinto@...opsys.com>
CC: <linux-omap@...r.kernel.org>, <linux-pci@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...s.com>
Subject: Re: [PATCH v6 15/18] PCI: dwc: Make cpu_addr_fixup take struct
dw_pcie as argument
On Wednesday 20 December 2017 04:59 AM, Niklas Cassel wrote:
> The current cpu addr fixup mask for ARTPEC-6, GENMASK(27, 0), is wrong.
> The correct cpu addr fixup mask for ARTPEC-6 is GENMASK(28, 0).
>
> However, having a hardcoded cpu addr fixup mask in each driver is
> arguably wrong.
> A device tree property called something like "cpu-addr-fixup-mask"
> would have been a better solution.
> Introducing such a property is not needed though, since we already have
> pp->cfg0_base and ep->phys_base, which is derived from already existing
> device tree properties.
>
> It is also worth noting that for ARTPEC-7, hardcoding the cpu addr fixup
> mask is not possible, since it uses a High Address Bits Look Up Table,
> which means that it can, at runtime, map the PCIe window to an arbitrary
> address in the 32-bit address space.
>
> By using pp->cfg0_base and ep->phys_base, we avoid hardcoding a mask
> in each driver. This should work for ARTPEC-6, DRA7xx, and ARTPEC-7.
> I have not changed the code in DRA7xx though, since their existing
> code works, but if they want, they could use the same logic as
> artpec6_pcie_cpu_addr_fixup, and thus remove their hardcoded mask.
>
> The reason why the fixup mask is needed is explained in commit f4c55c5a3f7f
> ("PCI: designware: Program ATU with untranslated address").
>
> Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
Acked-by: Kishon Vijay Abraham I <kishon@...com>
> ---
> drivers/pci/dwc/pci-dra7xx.c | 2 +-
> drivers/pci/dwc/pcie-artpec6.c | 18 ++++++++++++++----
> drivers/pci/dwc/pcie-designware.c | 2 +-
> drivers/pci/dwc/pcie-designware.h | 2 +-
> 4 files changed, 17 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
> index 224ff8affdce..89d87844abb3 100644
> --- a/drivers/pci/dwc/pci-dra7xx.c
> +++ b/drivers/pci/dwc/pci-dra7xx.c
> @@ -110,7 +110,7 @@ static inline void dra7xx_pcie_writel(struct dra7xx_pcie *pcie, u32 offset,
> writel(value, pcie->base + offset);
> }
>
> -static u64 dra7xx_pcie_cpu_addr_fixup(u64 pci_addr)
> +static u64 dra7xx_pcie_cpu_addr_fixup(struct dw_pcie *pci, u64 pci_addr)
> {
> return pci_addr & DRA7XX_CPU_TO_BUS_ADDR;
> }
> diff --git a/drivers/pci/dwc/pcie-artpec6.c b/drivers/pci/dwc/pcie-artpec6.c
> index e7de4e4649eb..318a2bd0d97e 100644
> --- a/drivers/pci/dwc/pcie-artpec6.c
> +++ b/drivers/pci/dwc/pcie-artpec6.c
> @@ -67,8 +67,6 @@ static const struct of_device_id artpec6_pcie_of_match[];
> #define PHY_STATUS 0x118
> #define PHY_COSPLLLOCK BIT(0)
>
> -#define ARTPEC6_CPU_TO_BUS_ADDR GENMASK(27, 0)
> -
> static u32 artpec6_pcie_readl(struct artpec6_pcie *artpec6_pcie, u32 offset)
> {
> u32 val;
> @@ -82,9 +80,21 @@ static void artpec6_pcie_writel(struct artpec6_pcie *artpec6_pcie, u32 offset, u
> regmap_write(artpec6_pcie->regmap, offset, val);
> }
>
> -static u64 artpec6_pcie_cpu_addr_fixup(u64 pci_addr)
> +static u64 artpec6_pcie_cpu_addr_fixup(struct dw_pcie *pci, u64 pci_addr)
> {
> - return pci_addr & ARTPEC6_CPU_TO_BUS_ADDR;
> + struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
> + struct pcie_port *pp = &pci->pp;
> + struct dw_pcie_ep *ep = &pci->ep;
> +
> + switch (artpec6_pcie->mode) {
> + case DW_PCIE_RC_TYPE:
> + return pci_addr - pp->cfg0_base;
> + case DW_PCIE_EP_TYPE:
> + return pci_addr - ep->phys_base;
> + default:
> + dev_err(pci->dev, "UNKNOWN device type\n");
> + }
> + return pci_addr;
> }
>
> static int artpec6_pcie_establish_link(struct dw_pcie *pci)
> diff --git a/drivers/pci/dwc/pcie-designware.c b/drivers/pci/dwc/pcie-designware.c
> index 88abdddee2ad..800be7a4f087 100644
> --- a/drivers/pci/dwc/pcie-designware.c
> +++ b/drivers/pci/dwc/pcie-designware.c
> @@ -149,7 +149,7 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
> u32 retries, val;
>
> if (pci->ops->cpu_addr_fixup)
> - cpu_addr = pci->ops->cpu_addr_fixup(cpu_addr);
> + cpu_addr = pci->ops->cpu_addr_fixup(pci, cpu_addr);
>
> if (pci->iatu_unroll_enabled) {
> dw_pcie_prog_outbound_atu_unroll(pci, index, type, cpu_addr,
> diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h
> index 24edac035160..cca5a81c1c74 100644
> --- a/drivers/pci/dwc/pcie-designware.h
> +++ b/drivers/pci/dwc/pcie-designware.h
> @@ -205,7 +205,7 @@ struct dw_pcie_ep {
> };
>
> struct dw_pcie_ops {
> - u64 (*cpu_addr_fixup)(u64 cpu_addr);
> + u64 (*cpu_addr_fixup)(struct dw_pcie *pcie, u64 cpu_addr);
> u32 (*read_dbi)(struct dw_pcie *pcie, void __iomem *base, u32 reg,
> size_t size);
> void (*write_dbi)(struct dw_pcie *pcie, void __iomem *base, u32 reg,
>
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