forked from mirrors/linux
1bdab0ee63
Embedding net_device into structures prohibits the usage of flexible arrays in the net_device structure. For more details, see the discussion at [1]. Un-embed the net_device from the private struct by converting it into a pointer. Then use the leverage the new alloc_netdev_dummy() helper to allocate and initialize dummy devices. [1] https://lore.kernel.org/all/20240229225910.79e224cf@kernel.org/ Signed-off-by: Breno Leitao <leitao@debian.org> Signed-off-by: David S. Miller <davem@davemloft.net>
277 lines
8.6 KiB
C
277 lines
8.6 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) 2018-2024 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/completion.h>
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#include <linux/mutex.h>
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include "ipa_version.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 28
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#define GSI_EVT_RING_COUNT_MAX 28
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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 platform_device;
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struct gsi;
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struct gsi_trans;
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struct ipa_gsi_endpoint_data;
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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. In this
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* case the initial value is assumed by hardware to be 0.
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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. The initial value used is arbitrary (so we use 0).
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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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u16 free_id; /* first free trans in array */
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u16 allocated_id; /* first allocated transaction */
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u16 committed_id; /* first committed transaction */
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u16 pending_id; /* first pending transaction */
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u16 completed_id; /* first completed transaction */
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u16 polled_id; /* first polled transaction */
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struct gsi_trans *trans; /* transaction array */
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struct gsi_trans **map; /* TRE -> transaction map */
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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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};
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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_FLOW_CONTROLLED = 0x5, /* IPA v4.2-v4.9 */
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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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u8 trans_tre_max; /* max TREs in a transaction */
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u16 tre_count;
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u16 event_count;
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struct gsi_ring tre_ring;
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u32 evt_ring_id;
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/* The following counts are used only for TX endpoints */
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u64 byte_count; /* total # bytes transferred */
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u64 trans_count; /* total # transactions */
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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 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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enum ipa_version version;
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void __iomem *virt; /* I/O mapped registers */
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const struct regs *regs;
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u32 irq;
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u32 channel_count;
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u32 evt_ring_count;
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u32 event_bitmap; /* allocated event rings */
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u32 modem_channel_bitmap; /* modem channels to allocate */
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u32 type_enabled_bitmap; /* GSI IRQ types enabled */
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u32 ieob_enabled_bitmap; /* IEOB IRQ enabled (event rings) */
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int result; /* Negative errno (generic commands) */
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struct completion completion; /* Signals GSI command completion */
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struct mutex mutex; /* protects commands, programming */
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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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struct net_device *dummy_dev; /* needed for NAPI */
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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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*
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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);
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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 outstanding 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_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_modem_channel_flow_control() - Set channel flow control state (IPA v4.2+)
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* @gsi: GSI pointer returned by gsi_setup()
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* @channel_id: Modem TX channel to control
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* @enable: Whether to enable flow control (i.e., prevent flow)
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*/
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void gsi_modem_channel_flow_control(struct gsi *gsi, u32 channel_id,
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bool enable);
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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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* @doorbell: Whether to (possibly) enable the doorbell engine
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*
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* Reset a channel and reconfigure it. The @doorbell flag indicates
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* that the doorbell engine should be enabled if needed.
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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 doorbell);
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/**
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* gsi_suspend() - Prepare the GSI subsystem for suspend
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* @gsi: GSI pointer
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*/
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void gsi_suspend(struct gsi *gsi);
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/**
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* gsi_resume() - Resume the GSI subsystem following suspend
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* @gsi: GSI pointer
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*/
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void gsi_resume(struct gsi *gsi);
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/**
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* gsi_channel_suspend() - Suspend a GSI channel
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* @gsi: GSI pointer
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* @channel_id: Channel to suspend
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*
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* For IPA v4.0+, suspend is implemented by stopping the channel.
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*/
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int gsi_channel_suspend(struct gsi *gsi, u32 channel_id);
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/**
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* gsi_channel_resume() - Resume a suspended GSI channel
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* @gsi: GSI pointer
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* @channel_id: Channel to resume
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*
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* For IPA v4.0+, the stopped channel is started again.
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*/
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int gsi_channel_resume(struct gsi *gsi, u32 channel_id);
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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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* @version: IPA hardware version (implies GSI version)
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* @count: Number of entries in the configuration data array
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* @data: Endpoint and channel configuration data
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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,
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enum ipa_version version, u32 count,
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const struct ipa_gsi_endpoint_data *data);
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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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