258 строки
8.0 KiB
C
258 строки
8.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
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* Copyright (C) 2018-2020 Linaro Ltd.
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*/
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#ifndef _GSI_H_
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#define _GSI_H_
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/completion.h>
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#include <linux/platform_device.h>
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#include <linux/netdevice.h>
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/* Maximum number of channels and event rings supported by the driver */
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#define GSI_CHANNEL_COUNT_MAX 17
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#define GSI_EVT_RING_COUNT_MAX 13
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/* Maximum TLV FIFO size for a channel; 64 here is arbitrary (and high) */
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#define GSI_TLV_MAX 64
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struct device;
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struct scatterlist;
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struct platform_device;
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struct gsi;
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struct gsi_trans;
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struct gsi_channel_data;
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struct ipa_gsi_endpoint_data;
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/* Execution environment IDs */
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enum gsi_ee_id {
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GSI_EE_AP = 0,
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GSI_EE_MODEM = 1,
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GSI_EE_UC = 2,
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GSI_EE_TZ = 3,
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};
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struct gsi_ring {
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void *virt; /* ring array base address */
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dma_addr_t addr; /* primarily low 32 bits used */
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u32 count; /* number of elements in ring */
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/* The ring index value indicates the next "open" entry in the ring.
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*
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* A channel ring consists of TRE entries filled by the AP and passed
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* to the hardware for processing. For a channel ring, the ring index
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* identifies the next unused entry to be filled by the AP.
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*
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* An event ring consists of event structures filled by the hardware
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* and passed to the AP. For event rings, the ring index identifies
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* the next ring entry that is not known to have been filled by the
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* hardware.
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*/
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u32 index;
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};
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/* Transactions use several resources that can be allocated dynamically
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* but taken from a fixed-size pool. The number of elements required for
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* the pool is limited by the total number of TREs that can be outstanding.
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*
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* If sufficient TREs are available to reserve for a transaction,
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* allocation from these pools is guaranteed to succeed. Furthermore,
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* these resources are implicitly freed whenever the TREs in the
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* transaction they're associated with are released.
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*
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* The result of a pool allocation of multiple elements is always
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* contiguous.
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*/
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struct gsi_trans_pool {
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void *base; /* base address of element pool */
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u32 count; /* # elements in the pool */
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u32 free; /* next free element in pool (modulo) */
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u32 size; /* size (bytes) of an element */
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u32 max_alloc; /* max allocation request */
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dma_addr_t addr; /* DMA address if DMA pool (or 0) */
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};
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struct gsi_trans_info {
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atomic_t tre_avail; /* TREs available for allocation */
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struct gsi_trans_pool pool; /* transaction pool */
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struct gsi_trans_pool sg_pool; /* scatterlist pool */
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struct gsi_trans_pool cmd_pool; /* command payload DMA pool */
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struct gsi_trans_pool info_pool;/* command information pool */
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struct gsi_trans **map; /* TRE -> transaction map */
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spinlock_t spinlock; /* protects updates to the lists */
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struct list_head alloc; /* allocated, not committed */
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struct list_head pending; /* committed, awaiting completion */
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struct list_head complete; /* completed, awaiting poll */
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struct list_head polled; /* returned by gsi_channel_poll_one() */
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};
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/* Hardware values signifying the state of a channel */
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enum gsi_channel_state {
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GSI_CHANNEL_STATE_NOT_ALLOCATED = 0x0,
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GSI_CHANNEL_STATE_ALLOCATED = 0x1,
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GSI_CHANNEL_STATE_STARTED = 0x2,
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GSI_CHANNEL_STATE_STOPPED = 0x3,
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GSI_CHANNEL_STATE_STOP_IN_PROC = 0x4,
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GSI_CHANNEL_STATE_ERROR = 0xf,
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};
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/* We only care about channels between IPA and AP */
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struct gsi_channel {
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struct gsi *gsi;
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bool toward_ipa;
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bool command; /* AP command TX channel or not */
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bool use_prefetch; /* use prefetch (else escape buf) */
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u8 tlv_count; /* # entries in TLV FIFO */
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u16 tre_count;
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u16 event_count;
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struct completion completion; /* signals channel state changes */
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enum gsi_channel_state state;
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struct gsi_ring tre_ring;
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u32 evt_ring_id;
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u64 byte_count; /* total # bytes transferred */
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u64 trans_count; /* total # transactions */
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/* The following counts are used only for TX endpoints */
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u64 queued_byte_count; /* last reported queued byte count */
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u64 queued_trans_count; /* ...and queued trans count */
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u64 compl_byte_count; /* last reported completed byte count */
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u64 compl_trans_count; /* ...and completed trans count */
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struct gsi_trans_info trans_info;
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struct napi_struct napi;
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};
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/* Hardware values signifying the state of an event ring */
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enum gsi_evt_ring_state {
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GSI_EVT_RING_STATE_NOT_ALLOCATED = 0x0,
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GSI_EVT_RING_STATE_ALLOCATED = 0x1,
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GSI_EVT_RING_STATE_ERROR = 0xf,
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};
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struct gsi_evt_ring {
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struct gsi_channel *channel;
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struct completion completion; /* signals event ring state changes */
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enum gsi_evt_ring_state state;
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struct gsi_ring ring;
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};
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struct gsi {
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struct device *dev; /* Same as IPA device */
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struct net_device dummy_dev; /* needed for NAPI */
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void __iomem *virt;
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u32 irq;
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bool irq_wake_enabled;
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u32 channel_count;
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u32 evt_ring_count;
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struct gsi_channel channel[GSI_CHANNEL_COUNT_MAX];
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struct gsi_evt_ring evt_ring[GSI_EVT_RING_COUNT_MAX];
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u32 event_bitmap;
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u32 event_enable_bitmap;
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u32 modem_channel_bitmap;
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struct completion completion; /* for global EE commands */
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struct mutex mutex; /* protects commands, programming */
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};
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/**
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* gsi_setup() - Set up the GSI subsystem
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* @gsi: Address of GSI structure embedded in an IPA structure
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* @db_enable: Whether to use the GSI doorbell engine
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*
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* @Return: 0 if successful, or a negative error code
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*
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* Performs initialization that must wait until the GSI hardware is
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* ready (including firmware loaded).
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*/
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int gsi_setup(struct gsi *gsi, bool db_enable);
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/**
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* gsi_teardown() - Tear down GSI subsystem
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* @gsi: GSI address previously passed to a successful gsi_setup() call
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*/
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void gsi_teardown(struct gsi *gsi);
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/**
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* gsi_channel_tre_max() - Channel maximum number of in-flight TREs
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* @gsi: GSI pointer
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* @channel_id: Channel whose limit is to be returned
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*
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* @Return: The maximum number of TREs oustanding on the channel
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*/
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u32 gsi_channel_tre_max(struct gsi *gsi, u32 channel_id);
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/**
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* gsi_channel_trans_tre_max() - Maximum TREs in a single transaction
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* @gsi: GSI pointer
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* @channel_id: Channel whose limit is to be returned
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*
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* @Return: The maximum TRE count per transaction on the channel
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*/
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u32 gsi_channel_trans_tre_max(struct gsi *gsi, u32 channel_id);
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/**
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* gsi_channel_start() - Start an allocated GSI channel
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* @gsi: GSI pointer
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* @channel_id: Channel to start
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*
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* @Return: 0 if successful, or a negative error code
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*/
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int gsi_channel_start(struct gsi *gsi, u32 channel_id);
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/**
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* gsi_channel_stop() - Stop a started GSI channel
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* @gsi: GSI pointer returned by gsi_setup()
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* @channel_id: Channel to stop
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*
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* @Return: 0 if successful, or a negative error code
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*/
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int gsi_channel_stop(struct gsi *gsi, u32 channel_id);
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/**
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* gsi_channel_reset() - Reset an allocated GSI channel
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* @gsi: GSI pointer
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* @channel_id: Channel to be reset
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* @db_enable: Whether doorbell engine should be enabled
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*
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* Reset a channel and reconfigure it. The @db_enable flag indicates
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* whether the doorbell engine will be enabled following reconfiguration.
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*
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* GSI hardware relinquishes ownership of all pending receive buffer
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* transactions and they will complete with their cancelled flag set.
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*/
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void gsi_channel_reset(struct gsi *gsi, u32 channel_id, bool db_enable);
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int gsi_channel_suspend(struct gsi *gsi, u32 channel_id, bool stop);
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int gsi_channel_resume(struct gsi *gsi, u32 channel_id, bool start);
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/**
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* gsi_init() - Initialize the GSI subsystem
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* @gsi: Address of GSI structure embedded in an IPA structure
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* @pdev: IPA platform device
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*
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* @Return: 0 if successful, or a negative error code
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*
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* Early stage initialization of the GSI subsystem, performing tasks
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* that can be done before the GSI hardware is ready to use.
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*/
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int gsi_init(struct gsi *gsi, struct platform_device *pdev, bool prefetch,
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u32 count, const struct ipa_gsi_endpoint_data *data,
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bool modem_alloc);
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/**
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* gsi_exit() - Exit the GSI subsystem
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* @gsi: GSI address previously passed to a successful gsi_init() call
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*/
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void gsi_exit(struct gsi *gsi);
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#endif /* _GSI_H_ */
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