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Message-id: <000001cf49b1$fcd8a810$f689f830$%han@samsung.com>
Date: Thu, 27 Mar 2014 20:45:01 +0900
From: Jingoo Han <jg1.han@...sung.com>
To: 'Kishon Vijay Abraham I' <kishon@...com>,
'Mohit Kumar' <mohit.kumar@...com>,
'Pratyush Anand' <pratyush.anand@...com>
Cc: devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-omap@...r.kernel.org, linux-pci@...r.kernel.org,
bhelgaas@...gle.com, robh+dt@...nel.org, pawel.moll@....com,
mark.rutland@....com, ijc+devicetree@...lion.org.uk,
galak@...eaurora.org, rob@...dley.net, linux@....linux.org.uk,
tony@...mide.com, rnayak@...com, paul@...an.com,
'Marek Vasut' <marex@...x.de>,
'Richard Zhu' <r65037@...escale.com>
Subject: Re: [RFC PATCH 03/12] pci: host: pcie-designware: Use *base-mask* for
configuring the iATU
On Wednesday, March 26, 2014 10:58 PM, Kishon Vijay Abraham I wrote:
>
> In DRA7, the cpu sees 32bit address, but the pcie controller can see only 28bit
> address. So whenever the cpu issues a read/write request, the 4 most
> significant bits are used by L3 to determine the target controller.
> For example, the cpu reserves 0x2000_0000 - 0x2FFF_FFFF for PCIe controller but
> the PCIe controller will see only (0x000_0000 - 0xFFF_FFF). So for programming
> the outbound translation window the *base* should be programmed as 0x000_0000.
> Whenever we try to write to say 0x2000_0000, it will be translated to whatever
> we have programmed in the translation window with base as 0x000_0000.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
(+cc Pratyush Anand, Marek Vasut, Richard Zhu)
Acked-by: Jingoo Han <jg1.han@...sung.com>
Mohit Kumar, Pratyush Anand,
If you have other opinions, please let us know. :-)
Thank you.
Best regards,
Jingoo Han
> ---
> .../devicetree/bindings/pci/designware-pcie.txt | 1 +
> drivers/pci/host/pcie-designware.c | 39 ++++++++++++++------
> drivers/pci/host/pcie-designware.h | 1 +
> 3 files changed, 29 insertions(+), 12 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt
> b/Documentation/devicetree/bindings/pci/designware-pcie.txt
> index d6fae13..c574dd3 100644
> --- a/Documentation/devicetree/bindings/pci/designware-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt
> @@ -27,6 +27,7 @@ Optional properties for fsl,imx6q-pcie
> - power-on-gpio: gpio pin number of power-enable signal
> - wake-up-gpio: gpio pin number of incoming wakeup signal
> - disable-gpio: gpio pin number of outgoing rfkill/endpoint disable signal
> +- base-mask: address mask for the PCIe controller target port
>
> Example:
>
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index 17ce88f..98b661c 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -464,6 +464,9 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
> return -EINVAL;
> }
>
> + if (of_property_read_u64(np, "base-mask", &pp->base_mask))
> + pp->base_mask = ~(0x0ULL);
> +
> if (IS_ENABLED(CONFIG_PCI_MSI)) {
> pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
> MAX_MSI_IRQS, &msi_domain_ops,
> @@ -503,12 +506,15 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
>
> static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
> {
> + u64 cfg0_base;
> +
> + cfg0_base = pp->cfg0_base & pp->base_mask;
> /* Program viewport 0 : OUTBOUND : CFG0 */
> dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0,
> PCIE_ATU_VIEWPORT);
> - dw_pcie_writel_rc(pp, pp->cfg0_base, PCIE_ATU_LOWER_BASE);
> - dw_pcie_writel_rc(pp, (pp->cfg0_base >> 32), PCIE_ATU_UPPER_BASE);
> - dw_pcie_writel_rc(pp, pp->cfg0_base + pp->config.cfg0_size - 1,
> + dw_pcie_writel_rc(pp, cfg0_base, PCIE_ATU_LOWER_BASE);
> + dw_pcie_writel_rc(pp, (cfg0_base >> 32), PCIE_ATU_UPPER_BASE);
> + dw_pcie_writel_rc(pp, cfg0_base + pp->config.cfg0_size - 1,
> PCIE_ATU_LIMIT);
> dw_pcie_writel_rc(pp, busdev, PCIE_ATU_LOWER_TARGET);
> dw_pcie_writel_rc(pp, 0, PCIE_ATU_UPPER_TARGET);
> @@ -518,14 +524,17 @@ static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
>
> static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev)
> {
> + u64 cfg1_base;
> +
> + cfg1_base = pp->cfg1_base & pp->base_mask;
> /* Program viewport 1 : OUTBOUND : CFG1 */
> dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1,
> PCIE_ATU_VIEWPORT);
> dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG1, PCIE_ATU_CR1);
> dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
> - dw_pcie_writel_rc(pp, pp->cfg1_base, PCIE_ATU_LOWER_BASE);
> - dw_pcie_writel_rc(pp, (pp->cfg1_base >> 32), PCIE_ATU_UPPER_BASE);
> - dw_pcie_writel_rc(pp, pp->cfg1_base + pp->config.cfg1_size - 1,
> + dw_pcie_writel_rc(pp, cfg1_base, PCIE_ATU_LOWER_BASE);
> + dw_pcie_writel_rc(pp, (cfg1_base >> 32), PCIE_ATU_UPPER_BASE);
> + dw_pcie_writel_rc(pp, cfg1_base + pp->config.cfg1_size - 1,
> PCIE_ATU_LIMIT);
> dw_pcie_writel_rc(pp, busdev, PCIE_ATU_LOWER_TARGET);
> dw_pcie_writel_rc(pp, 0, PCIE_ATU_UPPER_TARGET);
> @@ -533,14 +542,17 @@ static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev)
>
> static void dw_pcie_prog_viewport_mem_outbound(struct pcie_port *pp)
> {
> + u64 mem_base;
> +
> + mem_base = pp->mem_base & pp->base_mask;
> /* Program viewport 0 : OUTBOUND : MEM */
> dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0,
> PCIE_ATU_VIEWPORT);
> dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_MEM, PCIE_ATU_CR1);
> dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
> - dw_pcie_writel_rc(pp, pp->mem_base, PCIE_ATU_LOWER_BASE);
> - dw_pcie_writel_rc(pp, (pp->mem_base >> 32), PCIE_ATU_UPPER_BASE);
> - dw_pcie_writel_rc(pp, pp->mem_base + pp->config.mem_size - 1,
> + dw_pcie_writel_rc(pp, mem_base, PCIE_ATU_LOWER_BASE);
> + dw_pcie_writel_rc(pp, (mem_base >> 32), PCIE_ATU_UPPER_BASE);
> + dw_pcie_writel_rc(pp, mem_base + pp->config.mem_size - 1,
> PCIE_ATU_LIMIT);
> dw_pcie_writel_rc(pp, pp->config.mem_bus_addr, PCIE_ATU_LOWER_TARGET);
> dw_pcie_writel_rc(pp, upper_32_bits(pp->config.mem_bus_addr),
> @@ -549,14 +561,17 @@ static void dw_pcie_prog_viewport_mem_outbound(struct pcie_port *pp)
>
> static void dw_pcie_prog_viewport_io_outbound(struct pcie_port *pp)
> {
> + u64 io_base;
> +
> + io_base = pp->io_base & pp->base_mask;
> /* Program viewport 1 : OUTBOUND : IO */
> dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1,
> PCIE_ATU_VIEWPORT);
> dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_IO, PCIE_ATU_CR1);
> dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
> - dw_pcie_writel_rc(pp, pp->io_base, PCIE_ATU_LOWER_BASE);
> - dw_pcie_writel_rc(pp, (pp->io_base >> 32), PCIE_ATU_UPPER_BASE);
> - dw_pcie_writel_rc(pp, pp->io_base + pp->config.io_size - 1,
> + dw_pcie_writel_rc(pp, io_base, PCIE_ATU_LOWER_BASE);
> + dw_pcie_writel_rc(pp, (io_base >> 32), PCIE_ATU_UPPER_BASE);
> + dw_pcie_writel_rc(pp, io_base + pp->config.io_size - 1,
> PCIE_ATU_LIMIT);
> dw_pcie_writel_rc(pp, pp->config.io_bus_addr, PCIE_ATU_LOWER_TARGET);
> dw_pcie_writel_rc(pp, upper_32_bits(pp->config.io_bus_addr),
> diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
> index 3063b35..3fa12a6 100644
> --- a/drivers/pci/host/pcie-designware.h
> +++ b/drivers/pci/host/pcie-designware.h
> @@ -35,6 +35,7 @@ struct pcie_port {
> struct device *dev;
> u8 root_bus_nr;
> void __iomem *dbi_base;
> + u64 base_mask;
> u64 cfg0_base;
> void __iomem *va_cfg0_base;
> u64 cfg1_base;
> --
> 1.7.9.5
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