211 lines
6.3 KiB
C
211 lines
6.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only
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*
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* Copyright (C) 2020-21 Intel Corporation.
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*/
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#ifndef IOSM_IPC_PCIE_H
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#define IOSM_IPC_PCIE_H
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#include <linux/device.h>
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#include <linux/pci.h>
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#include <linux/skbuff.h>
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#include "iosm_ipc_irq.h"
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/* Device ID */
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#define INTEL_CP_DEVICE_7560_ID 0x7560
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#define INTEL_CP_DEVICE_7360_ID 0x7360
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/* Define for BAR area usage */
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#define IPC_DOORBELL_BAR0 0
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#define IPC_SCRATCHPAD_BAR2 2
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/* Defines for DOORBELL registers information */
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#define IPC_DOORBELL_CH_OFFSET BIT(5)
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#define IPC_WRITE_PTR_REG_0 BIT(4)
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#define IPC_CAPTURE_PTR_REG_0 BIT(3)
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/* Number of MSI used for IPC */
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#define IPC_MSI_VECTORS 1
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/* Total number of Maximum IPC IRQ vectors used for IPC */
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#define IPC_IRQ_VECTORS IPC_MSI_VECTORS
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/**
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* enum ipc_pcie_sleep_state - Enum type to different sleep state transitions
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* @IPC_PCIE_D0L12: Put the sleep state in D0L12
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* @IPC_PCIE_D3L2: Put the sleep state in D3L2
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*/
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enum ipc_pcie_sleep_state {
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IPC_PCIE_D0L12,
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IPC_PCIE_D3L2,
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};
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/**
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* struct iosm_pcie - IPC_PCIE struct.
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* @pci: Address of the device description
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* @dev: Pointer to generic device structure
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* @ipc_regs: Remapped CP doorbell address of the irq register
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* set, to fire the doorbell irq.
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* @scratchpad: Remapped CP scratchpad address, to send the
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* configuration. tuple and the IPC descriptors
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* to CP in the ROM phase. The config tuple
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* information are saved on the MSI scratchpad.
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* @imem: Pointer to imem data struct
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* @ipc_regs_bar_nr: BAR number to be used for IPC doorbell
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* @scratchpad_bar_nr: BAR number to be used for Scratchpad
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* @nvec: number of requested irq vectors
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* @doorbell_reg_offset: doorbell_reg_offset
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* @doorbell_write: doorbell write register
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* @doorbell_capture: doorbell capture resgister
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* @suspend: S2IDLE sleep/active
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* @d3l2_support: Read WWAN RTD3 BIOS setting for D3L2 support
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*/
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struct iosm_pcie {
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struct pci_dev *pci;
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struct device *dev;
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void __iomem *ipc_regs;
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void __iomem *scratchpad;
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struct iosm_imem *imem;
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int ipc_regs_bar_nr;
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int scratchpad_bar_nr;
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int nvec;
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u32 doorbell_reg_offset;
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u32 doorbell_write;
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u32 doorbell_capture;
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unsigned long suspend;
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enum ipc_pcie_sleep_state d3l2_support;
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};
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/**
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* struct ipc_skb_cb - Struct definition of the socket buffer which is mapped to
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* the cb field of sbk
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* @mapping: Store physical or IOVA mapped address of skb virtual add.
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* @direction: DMA direction
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* @len: Length of the DMA mapped region
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* @op_type: Expected values are defined about enum ipc_ul_usr_op.
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*/
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struct ipc_skb_cb {
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dma_addr_t mapping;
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int direction;
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int len;
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u8 op_type;
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};
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/**
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* enum ipc_ul_usr_op - Control operation to execute the right action on
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* the user interface.
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* @UL_USR_OP_BLOCKED: The uplink app was blocked until CP confirms that the
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* uplink buffer was consumed triggered by the IRQ.
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* @UL_MUX_OP_ADB: In MUX mode the UL ADB shall be addedd to the free list.
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* @UL_DEFAULT: SKB in non muxing mode
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*/
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enum ipc_ul_usr_op {
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UL_USR_OP_BLOCKED,
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UL_MUX_OP_ADB,
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UL_DEFAULT,
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};
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/**
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* ipc_pcie_addr_map - Maps the kernel's virtual address to either IOVA
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* address space or Physical address space, the mapping is
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* stored in the skb's cb.
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* @ipc_pcie: Pointer to struct iosm_pcie
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* @data: Skb mem containing data
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* @size: Data size
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* @mapping: Dma mapping address
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* @direction: Data direction
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*
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* Returns: 0 on success and failure value on error
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*/
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int ipc_pcie_addr_map(struct iosm_pcie *ipc_pcie, unsigned char *data,
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size_t size, dma_addr_t *mapping, int direction);
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/**
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* ipc_pcie_addr_unmap - Unmaps the skb memory region from IOVA address space
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* @ipc_pcie: Pointer to struct iosm_pcie
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* @size: Data size
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* @mapping: Dma mapping address
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* @direction: Data direction
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*/
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void ipc_pcie_addr_unmap(struct iosm_pcie *ipc_pcie, size_t size,
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dma_addr_t mapping, int direction);
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/**
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* ipc_pcie_alloc_skb - Allocate an uplink SKB for the given size.
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* @ipc_pcie: Pointer to struct iosm_pcie
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* @size: Size of the SKB required.
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* @flags: Allocation flags
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* @mapping: Copies either mapped IOVA add. or converted Phy address
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* @direction: DMA data direction
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* @headroom: Header data offset
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*
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* Returns: Pointer to ipc_skb on Success, NULL on failure.
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*/
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struct sk_buff *ipc_pcie_alloc_skb(struct iosm_pcie *ipc_pcie, size_t size,
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gfp_t flags, dma_addr_t *mapping,
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int direction, size_t headroom);
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/**
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* ipc_pcie_alloc_local_skb - Allocate a local SKB for the given size.
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* @ipc_pcie: Pointer to struct iosm_pcie
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* @flags: Allocation flags
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* @size: Size of the SKB required.
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*
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* Returns: Pointer to ipc_skb on Success, NULL on failure.
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*/
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struct sk_buff *ipc_pcie_alloc_local_skb(struct iosm_pcie *ipc_pcie,
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gfp_t flags, size_t size);
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/**
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* ipc_pcie_kfree_skb - Free skb allocated by ipc_pcie_alloc_*_skb().
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* @ipc_pcie: Pointer to struct iosm_pcie
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* @skb: Pointer to the skb
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*/
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void ipc_pcie_kfree_skb(struct iosm_pcie *ipc_pcie, struct sk_buff *skb);
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/**
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* ipc_pcie_check_data_link_active - Check Data Link Layer Active
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* @ipc_pcie: Pointer to struct iosm_pcie
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*
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* Returns: true if active, otherwise false
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*/
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bool ipc_pcie_check_data_link_active(struct iosm_pcie *ipc_pcie);
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/**
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* ipc_pcie_suspend - Callback invoked by pm_runtime_suspend. It decrements
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* the device's usage count then, carry out a suspend,
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* either synchronous or asynchronous.
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* @ipc_pcie: Pointer to struct iosm_pcie
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*
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* Returns: 0 on success and failure value on error
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*/
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int ipc_pcie_suspend(struct iosm_pcie *ipc_pcie);
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/**
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* ipc_pcie_resume - Callback invoked by pm_runtime_resume. It increments
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* the device's usage count then, carry out a resume,
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* either synchronous or asynchronous.
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* @ipc_pcie: Pointer to struct iosm_pcie
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*
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* Returns: 0 on success and failure value on error
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*/
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int ipc_pcie_resume(struct iosm_pcie *ipc_pcie);
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/**
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* ipc_pcie_check_aspm_enabled - Check if ASPM L1 is already enabled
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* @ipc_pcie: Pointer to struct iosm_pcie
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* @parent: True if checking ASPM L1 for parent else false
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*
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* Returns: true if ASPM is already enabled else false
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*/
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bool ipc_pcie_check_aspm_enabled(struct iosm_pcie *ipc_pcie,
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bool parent);
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/**
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* ipc_pcie_config_aspm - Configure ASPM L1
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* @ipc_pcie: Pointer to struct iosm_pcie
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*/
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void ipc_pcie_config_aspm(struct iosm_pcie *ipc_pcie);
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#endif
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