mirror of
git://nv-tegra.nvidia.com/linux-nv-oot.git
synced 2025-12-22 17:25:35 +03:00
e6a11f7e4c
Enabled RST# IRQ during EP_START after tegra264_pcie_ep_rst_deassert is invoked for EP and disable RST# IRQ during EP_STOP after tegra264_pcie_ep_rst_assert is executed for EP and EP is not available anymore. This prevents unwanted EP accesses during RP reset sequence causing PERST# to toggle, while EP is not ready or available. Bug 5281037 Change-Id: I43e1fd6c6ccfaae64a6bb2375a3685f186766d78 Signed-off-by: Prakhar Srivastava <prasrivastav@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3363313 Reviewed-by: svcacv <svcacv@nvidia.com> GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com> Reviewed-by: Nagarjuna Kristam <nkristam@nvidia.com> Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>
583 lines
14 KiB
C
583 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only*/
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/* SPDX-FileCopyrightText: Copyright (c) 2025, NVIDIA CORPORATION. All rights reserved.*/
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#ifndef PCIE_TEGRAT264_EP_H
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#define PCIE_TEGRAT264_EP_H
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#ifdef DOXYGEN_ICD
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/**
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* @dir
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* - forward
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*/
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#endif
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/**
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* @brief
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* callback API from Linux System to perform Tegra264 SoC's PCIe EP controller
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* platform driver probe.
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*
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* @param[in] pdev Platform device associated with platform driver.
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*
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* @calib
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* - CAL_NET_PIF$CalPcieEp
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*
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* @usage
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* - Allowed context for the API call
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* - Interrupt: No
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* - Signal handler: No
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* - Thread-Safe: No
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* - Sync/Async: Sync
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* - Re-entrant: No
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* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: Yes
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* - Run time: No
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* - De-initialization: No
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*
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* @return
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* - 0 on success
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* - "negative value" on failure.
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*
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*/
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static int tegra264_pcie_ep_probe(struct platform_device *pdev);
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#ifdef DOXYGEN_ICD
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/**
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* @dir
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* - forward
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*/
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#endif
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/**
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* @brief
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* callback API from Linux System to perform Tegra264 SoC's PCIe EP controller
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* platform driver remove.
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*
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* @param[in] pdev Platform device associated with platform driver.
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*
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* @usage
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* - Allowed context for the API call
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* - Interrupt: No
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* - Signal handler: No
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* - Thread-Safe: No
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* - Sync/Async: Sync
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* - Re-entrant: No
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* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: No
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* - Run time: No
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* - De-initialization: Yes
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*
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* @return
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* - 0 always
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*
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* @outcome
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* - EP controller driver is de-registered.
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* - EP controller is de-initialized(if initialized).
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*/
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#if defined(NV_PLATFORM_DRIVER_STRUCT_REMOVE_RETURNS_VOID) /* Linux v6.11 */
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static void tegra264_pcie_ep_remove_wrapper(struct platform_device *pdev);
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#else
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static int tegra264_pcie_ep_remove_wrapper(struct platform_device *pdev);
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#endif
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#ifdef DOXYGEN_ICD
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/**
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* @dir
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* - forward
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*/
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#endif
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/**
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* @brief
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* callback API from Linux System to perform Tegra264 SoC's PCIe EP controller
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* driver suspend.
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*
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* @param[in] dev Device structure associated with driver.
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*
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* @usage
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* - Allowed context for the API call
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* - Interrupt: No
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* - Signal handler: No
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* - Thread-Safe: No
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* - Sync/Async: Sync
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* - Re-entrant: No
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* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: No
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* - Run time: No
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* - De-initialization: Yes
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*
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* @return
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* - 0 on success
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* - -EPERM if PCIE EP controller is enabled.
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*
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*/
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static int tegra264_pcie_ep_suspend(struct device *dev);
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#ifdef DOXYGEN_ICD
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/**
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* @dir
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* - forward
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*/
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#endif
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/**
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* @brief
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* callback API from Linux System to perform Tegra264 SoC's PCIe EP controller
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* driver resume.
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*
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* @param[in] dev Device structure associated with driver.
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*
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* @usage
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* - Allowed context for the API call
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* - Interrupt: No
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* - Signal handler: No
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* - Thread-Safe: No
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* - Sync/Async: Sync
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* - Re-entrant: No
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* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: Yes
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* - Run time: No
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* - De-initialization: No
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*
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* @return
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* - 0 always
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*
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* @outcome
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* - Reset IRQ is enabled.
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*/
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static int tegra264_pcie_ep_resume(struct device *dev);
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#ifdef DOXYGEN_ICD
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/**
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* @dir
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* - forward
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*/
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#endif
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/**
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* @brief
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* Callback API from PCIe EP controller framework to provide config space header info.
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*
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* @param[in] epc EP controller structure pointer. This is used to retrieve Drive specific
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* internal data structures.
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* @param[in] fn Function number. Unused parameter.
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* @param[in] vfn Virtual Function number. Unused parameter.
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* @param[in] hdr Pointer to the struct pci_epf_header containing header info.
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* Header information supported are:
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* - LSB 7 bits of deviceid.
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* - baseclass_code, subclass_code, progif_code.
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* - Other not supported and ignored.
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*
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* @usage
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* - Allowed context for the API call
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* - Interrupt: No
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* - Signal handler: No
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* - Thread-Safe: No
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* - Sync/Async: Sync
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* - Re-entrant: No
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* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: Yes
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* - Run time: Yes
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* - De-initialization: Yes
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*
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* @return
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* - 0 always.
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*
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* @pre
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* - Must be called before <a href="#tegra264-pcie-ep-start">(tegra264_pcie_ep_start())</a>.
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* - Failure to call will result in HW power on reset values for header info.
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*
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* @outcome
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* - Header information is configured during EP controller initialization.
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*/
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static int tegra264_pcie_ep_write_header(struct pci_epc *epc, u8 fn,
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#if defined(NV_PCI_EPC_WRITE_HEADER_HAS_VFN_ARG)
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u8 vfn,
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#endif
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struct pci_epf_header *hdr);
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#ifdef DOXYGEN_ICD
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/**
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* @dir
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* - forward
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*/
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#endif
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/**
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* @brief
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* Callback API from PCIe EP controller framework to set Bar configuration.
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*
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* @param[in] epc EP controller structure pointer. This is used to retrieve Drive specific
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* internal data structures.
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* @param[in] fn Function number. Unused parameter.
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* @param[in] vfn Virtual Function number. Unused parameter.
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* @param[in] epf_bar Pointer to the struct pci_epf_bar containing BAR configuration.
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* Supported configuration are:
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* - Only 64-bit pre-fetch memory type
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* - Bar number 1 and 2.
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* - Bar 1 must of minimum 64MB and Max 64GB, must be power of 2.
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* - Bar 2 must be of size 32MB.
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*
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* @usage
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* - Allowed context for the API call
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* - Interrupt: No
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* - Signal handler: No
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* - Thread-Safe: No
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* - Sync/Async: Sync
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* - Re-entrant: No
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* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: Yes
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* - Run time: Yes
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* - De-initialization: Yes
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*
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* @pre
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* - Must be called before <a href="#tegra264-pcie-ep-start">(tegra264_pcie_ep_start())</a>.
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* - Failure to call will result in
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* <a href="#tegra264-pcie-ep-start">(tegra264_pcie_ep_start())</a> failure.
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*
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* @return
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* - 0 on If Bar details are in range..
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* - -EINVAL if Bar configuration is not supported or called once link is established.
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*/
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static int tegra264_pcie_ep_set_bar(struct pci_epc *epc, u8 fn,
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#if defined(NV_PCI_EPC_WRITE_HEADER_HAS_VFN_ARG)
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u8 vfn,
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#endif
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struct pci_epf_bar *epf_bar);
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#ifdef DOXYGEN_ICD
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/**
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* @dir
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* - forward
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*/
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#endif
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/**
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* @brief
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* Callback API from PCIe EP controller framework to clear BAR configuration.
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*
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* @param[in] epc EP controller structure pointer. This is used to retrieve Drive specific
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* internal data structures.
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* @param[in] fn Function number. Unused parameter.
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* @param[in] vfn Virtual Function number. Unused parameter.
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* @param[in] epf_bar Pointer to the struct pci_epf_bar containing BAR configuration.
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* Supported configuration are:
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* - BAR number 0 and 1.
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*
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* @usage
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* - Allowed context for the API call
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* - Interrupt: No
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* - Signal handler: No
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* - Thread-Safe: No
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* - Sync/Async: Sync
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* - Re-entrant: No
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* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: Yes
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* - Run time: Yes
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* - De-initialization: Yes
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*
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* @outcome
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* - BAR mapping details of supported BAR number are cleared.
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* - No AI taken for unsupported BAR number or when called before controller
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* is initialized.
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*
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*/
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static void tegra264_pcie_ep_clear_bar(struct pci_epc *epc, u8 fn,
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#if defined(NV_PCI_EPC_WRITE_HEADER_HAS_VFN_ARG)
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u8 vfn,
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#endif
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struct pci_epf_bar *epf_bar);
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#ifdef DOXYGEN_ICD
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/**
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* @dir
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* - forward
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*/
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#endif
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/**
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* @brief
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* Callback API from PCIe EP controller framework to map outbound address to controller aperture.
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*
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* @param[in] epc EP controller structure pointer. This is used to retrieve Drive specific
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* internal data structures.
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* @param[in] func_no Function number. Unused parameter
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* @param[in] vfunc_no Virtual Function number. Unused parameter
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* @param[in] addr Host memory address to map.
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* @param[in] pci_addr Aperture controller address to map 'addr' parameter.
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* @param[in] size The size of the mapping.
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*
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* @usage
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* - Allowed context for the API call
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* - Interrupt: No
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* - Signal handler: No
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* - Thread-Safe: No
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* - Sync/Async: Sync
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* - Re-entrant: No
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* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: Yes
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* - Run time: Yes
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* - De-initialization: Yes
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*
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* @return
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* - 0 on success.
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* - EINVAL if there are no aperture windows available to program the mapping or
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* if called before controller is initialized.
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*
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* @outcome
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* - On success, outbound address is mapped to controller aperture and caller can access
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* remote memory.
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*/
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static int tegra264_pcie_ep_map_addr(struct pci_epc *epc, u8 func_no,
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#if defined(NV_PCI_EPC_WRITE_HEADER_HAS_VFN_ARG)
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u8 vfunc_no,
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#endif
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phys_addr_t addr, u64 pci_addr, size_t size);
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#ifdef DOXYGEN_ICD
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/**
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* @dir
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* - forward
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*/
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#endif
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/**
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* @brief
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* Callback API from PCIe EP controller framework to un-map outbound address to
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* controller aperture.
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*
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* @param[in] epc EP controller structure pointer. This is used to retrieve Drive specific
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* internal data structures.
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* @param[in] func_no Function number. Unused parameter
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* @param[in] vfunc_no Virtual Function number. Unused parameter
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* @param[in] addr Aperture controller address to unmap.
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*
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* @usage
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* - Allowed context for the API call
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* - Interrupt: No
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* - Signal handler: No
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* - Thread-Safe: No
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* - Sync/Async: Sync
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* - Re-entrant: No
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* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: Yes
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* - Run time: Yes
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* - De-initialization: Yes
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*
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* @outcome
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* - If controller is initialized and Aperture is mapped, then mapping details in Tegra264 EP
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* controller register is cleared. Else, no AI taken.
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*/
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static void tegra264_pcie_ep_unmap_addr(struct pci_epc *epc, u8 func_no,
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#if defined(NV_PCI_EPC_WRITE_HEADER_HAS_VFN_ARG)
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u8 vfunc_no,
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#endif
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phys_addr_t addr);
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#ifndef DOXYGEN_ICD
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/** MSI is expected not to be decomposed, hence no ICD documentation planned yet */
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static int tegra264_pcie_ep_set_msi(struct pci_epc *epc, u8 fn,
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#if defined(NV_PCI_EPC_WRITE_HEADER_HAS_VFN_ARG)
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u8 vfn,
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#endif
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u8 mmc);
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static int tegra264_pcie_ep_get_msi(struct pci_epc *epc,
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#if defined(NV_PCI_EPC_WRITE_HEADER_HAS_VFN_ARG)
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u8 fn, u8 vfn);
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#else
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u8 fn);
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#endif
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#endif
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static int tegra264_pcie_ep_raise_irq(struct pci_epc *epc, u8 fn,
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#if defined(NV_PCI_EPC_WRITE_HEADER_HAS_VFN_ARG)
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u8 vfn,
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#endif
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#if defined(PCI_EPC_IRQ_TYPE_ENUM_PRESENT) /* Dropped from Linux 6.8 */
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enum pci_epc_irq_type type,
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#else
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unsigned int type,
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#endif
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u16 irq_num);
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#ifdef DOXYGEN_ICD
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/**
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* @dir
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* - forward
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*/
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#endif
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/**
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* @brief
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* Callback API from PCIe EP controller framework to start EP controller functionality.
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*
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* @param[in] epc EP controller structure pointer. This is used to retrieve Drive specific
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* internal data structures.
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*
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* @usage
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* - Allowed context for the API call
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* - Interrupt: No
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* - Signal handler: No
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* - Thread-Safe: No
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* - Sync/Async: Sync
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* - Re-entrant: No
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* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: Yes
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* - Run time: Yes
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* - De-initialization: Yes
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*
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* @return
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* - 0 on success.
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* - -EINVAL if controller is failed to initialize
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*
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* @pre
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* - Must be called after <a href="#tegra264-pcie-ep-set-bar">(tegra264_pcie_ep_set_bar())</a>.
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*
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* @outcome
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* - Tegra264 EP controller is initialized, if
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* - reset GPIO is already de-asserted.
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* - pre-conditions met.
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* - pex-prsnt GPIO is de-asserted if specified in CAL_NET_PIF$CalPcieEp.
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* - pex-rst-irq is enabled.
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*/
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static int tegra264_pcie_ep_start(struct pci_epc *epc);
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#ifdef DOXYGEN_ICD
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/**
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* @dir
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* - forward
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*/
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#endif
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/**
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* @brief
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* Callback API from PCIe EP controller framework to stop EP controller functionality.
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*
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* @param[in] epc EP controller structure pointer. This is used to retrieve Drive specific
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* internal data structures.
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*
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* @usage
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* - Allowed context for the API call
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|
* - Interrupt: No
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|
* - Signal handler: No
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|
* - Thread-Safe: No
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|
* - Sync/Async: Sync
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|
* - Re-entrant: No
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|
* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: Yes
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* - Run time: Yes
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* - De-initialization: Yes
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*
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* @outcome
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* - pex-rst-irq is disabled.
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* - pex-prsnt GPIO is de-asserted if specified in CAL_NET_PIF$CalPcieEp.
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* - Tegra264 EP controller is de-initialized, if controller is initialized.
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*/
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static void tegra264_pcie_ep_stop(struct pci_epc *epc);
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#ifdef DOXYGEN_ICD
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/**
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* @dir
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* - forward
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*/
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#endif
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/**
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* @brief
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* Interrupt Callback API for PCIe EP controller interrupt.
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*
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* @param[in] irq un-used data
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* @param[in] arg This is used to retrieve Drive specific internal data structures.
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*
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* @usage
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* - Allowed context for the API call
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|
* - Interrupt: Yes
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* - Signal handler: No
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* - Thread-Safe: No
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* - Sync/Async: Sync
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* - Re-entrant: No
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* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: Yes
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* - Run time: Yes
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* - De-initialization: Yes
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*
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* @return
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* - IRQ_WAKE_THREAD - If interrupt notifies about EP reset state
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* - IRQ_HANDLED - everything else
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*
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*/
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static irqreturn_t tegra264_pcie_ep_irq_handler(int irq, void *arg);
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#ifdef DOXYGEN_ICD
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/**
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* @dir
|
|
* - forward
|
|
*/
|
|
#endif
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/**
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* @brief
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* Threaded interrupt Callback API for PCIe EP controller interrupt.
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*
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* @param[in] irq un-used data
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* @param[in] arg This is used to retrieve Drive specific internal data structures.
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*
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* @usage
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* - Allowed context for the API call
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* - Interrupt: Yes
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* - Signal handler: No
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* - Thread-Safe: No
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* - Sync/Async: Sync
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* - Re-entrant: No
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* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: Yes
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* - Run time: Yes
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* - De-initialization: Yes
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*
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* @return
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* - IRQ_HANDLED - always
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*
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* @outcome
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* - PCIe EP controller is de-initialized and initialized.
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*
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*/
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static irqreturn_t tegra264_pcie_ep_irq_thread(int irq, void *arg);
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#ifdef DOXYGEN_ICD
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/**
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* @dir
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* - forward
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*/
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#endif
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/**
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* @brief
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* Interrupt Callback API for PCIe EP reset-gpio changes.
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*
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* @param[in] irq un-used data
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* @param[in] arg This is used to retrieve Drive specific internal data structures.
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*
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* @usage
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|
* - Allowed context for the API call
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|
* - Interrupt: Yes
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|
* - Signal handler: No
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|
* - Thread-Safe: No
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|
* - Sync/Async: Sync
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|
* - Re-entrant: No
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* - Required Privileges: None.
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* - Operation Mode
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* - Initialization: Yes
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* - Run time: Yes
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* - De-initialization: Yes
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*
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* @return
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* - IRQ_HANDLED - always
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*
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* @outcome
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* - PCIe EP controller is de-initialized if reset GPIO status is asserted.
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* - PCIe EP controller is Initialized if reset GPIO status and pex-prsnt GPIO
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* are de-asserted.
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*
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*/
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static irqreturn_t tegra264_pcie_ep_rst_irq(int irq, void *arg);
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#endif /* PCIE_TEGRAT264_EP_H */
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