On 03/08/2012 07:51 AM, Thierry Reding wrote:
> This commit adds support for message signaled interrupts to the Tegra
> PCIe controller.
>
> Signed-off-by: Thierry Reding <thierry.red...@avionic-design.de>
> ---
> This code is taken from the NVIDIA Vibrante kernel and therefore has no
> appropriate Signed-off-by from the original author. Maybe someone at
> NVIDIA can find out who wrote this code and maybe provide a proper
> Signed-off-by that I can add?
I think if you look in:
git://nv-tegra.nvidia.com/linux-2.6.git android-tegra-2.6.36
the following commits are what you're after:
de7fd8768b32da66eaf4eaf58473c65f7a76808d
arm: tegra: pcie: enabling MSI support for pcie
ac1f8310811c64a084511d2afc27f66334b31a81
ARM: tegra: pcie: fix return value from MSI irq routine
Although the patch below only partially resembles those patches, I guess
because you've rewritten the code a lot to conform to the current kernel
APIs, clean stuff up, etc. Perhaps just saying "based on code by Krishna
Kishore <kth...@nvidia.com>" is enough...
> diff --git a/arch/arm/mach-tegra/pcie.c b/arch/arm/mach-tegra/pcie.c
> +static int tegra_pcie_enable_msi(struct platform_device *pdev)
> +{
> + struct tegra_pcie_info *pcie = platform_get_drvdata(pdev);
> + volatile void *pages;
> + unsigned long base;
> + unsigned int msi;
> + int msi_base;
> + int err;
> + u32 reg;
> +
> + mutex_init(&pcie->msi_lock);
> +
> + msi_base = irq_alloc_descs(-1, 0, INT_PCI_MSI_NR, 0);
> + if (msi_base < 0) {
> + dev_err(&pdev->dev, "failed to allocate IRQs\n");
> + return msi_base;
> + }
> +
> + pcie->msi_domain = irq_domain_add_legacy(pcie->dev->of_node,
> + INT_PCI_MSI_NR, msi_base,
> + 0, &irq_domain_simple_ops,
> + NULL);
> + if (!pcie->msi_domain) {
> + dev_err(&pdev->dev, "failed to create IRQ domain\n");
Free the IRQ descriptors in the error paths?
> + return -ENOMEM;
> + }
> +
> + pcie->msi_chip.name = "PCIe-MSI";
> + pcie->msi_chip.irq_enable = unmask_msi_irq;
> + pcie->msi_chip.irq_disable = mask_msi_irq;
> + pcie->msi_chip.irq_mask = mask_msi_irq;
> + pcie->msi_chip.irq_unmask = unmask_msi_irq;
> +
> + for (msi = 0; msi < INT_PCI_MSI_NR; msi++) {
> + unsigned int irq = irq_find_mapping(pcie->msi_domain, msi);
> +
> + irq_set_chip_data(irq, pcie);
> + irq_set_chip_and_handler(irq, &pcie->msi_chip,
> + handle_simple_irq);
> + set_irq_flags(irq, IRQF_VALID);
> + }
> +
> + err = platform_get_irq(pdev, 1);
> + if (err < 0) {
> + dev_err(&pdev->dev, "failed to get IRQ: %d\n", err);
Same here, and undo setting IRQF_VALID?
> + return err;
> + }
...
> +static int tegra_pcie_disable_msi(struct platform_device *pdev)
> +{
> + return 0;
> +}
This is empty in both the ifdef(CONFIG_PCI_MSI) case and otherwise. It
should probably clean everything up here right?
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