drivers/net/ipa/ipa_data.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
   4  * Copyright (C) 2019-2020 Linaro Ltd.
   5  */
   6 #ifndef _IPA_DATA_H_
   7 #define _IPA_DATA_H_
   8
   9 #include <linux/types.h>
  10
  11 #include "ipa_version.h"
  12 #include "ipa_endpoint.h"
  13 #include "ipa_mem.h"
  14
  15 /**
  16  * DOC: IPA/GSI Configuration Data
  17  *
  18  * Boot-time configuration data is used to define the configuration of the
  19  * IPA and GSI resources to use for a given platform.  This data is supplied
  20  * via the Device Tree match table, associated with a particular compatible
  21  * string.  The data defines information about resources, endpoints, and
  22  * channels.
  23  *
  24  * Resources are data structures used internally by the IPA hardware.  The
  25  * configuration data defines the number (or limits of the number) of various
  26  * types of these resources.
  27  *
  28  * Endpoint configuration data defines properties of both IPA endpoints and
  29  * GSI channels.  A channel is a GSI construct, and represents a single
  30  * communication path between the IPA and a particular execution environment
  31  * (EE), such as the AP or Modem.  Each EE has a set of channels associated
  32  * with it, and each channel has an ID unique for that EE.  For the most part
  33  * the only GSI channels of concern to this driver belong to the AP
  34  *
  35  * An endpoint is an IPA construct representing a single channel anywhere
  36  * in the system.  An IPA endpoint ID maps directly to an (EE, channel_id)
  37  * pair.  Generally, this driver is concerned with only endpoints associated
  38  * with the AP, however this will change when support for routing (etc.) is
  39  * added.  IPA endpoint and GSI channel configuration data are defined
  40  * together, establishing the endpoint_id->(EE, channel_id) mapping.
  41  *
  42  * Endpoint configuration data consists of three parts:  properties that
  43  * are common to IPA and GSI (EE ID, channel ID, endpoint ID, and direction);
  44  * properties associated with the GSI channel; and properties associated with
  45  * the IPA endpoint.
  46  */
  47
  48 /* The maximum value returned by ipa_resource_group_count() */
  49 #define IPA_RESOURCE_GROUP_COUNT        4
  50
  51 /** enum ipa_resource_type_src - source resource types */
  52 /**
  53  * struct gsi_channel_data - GSI channel configuration data
  54  * @tre_count:          number of TREs in the channel ring
  55  * @event_count:        number of slots in the associated event ring
  56  * @tlv_count:          number of entries in channel's TLV FIFO
  57  *
  58  * A GSI channel is a unidirectional means of transferring data to or
  59  * from (and through) the IPA.  A GSI channel has a ring buffer made
  60  * up of "transfer elements" (TREs) that specify individual data transfers
  61  * or IPA immediate commands.  TREs are filled by the AP, and control
  62  * is passed to IPA hardware by writing the last written element
  63  * into a doorbell register.
  64  *
  65  * When data transfer commands have completed the GSI generates an
  66  * event (a structure of data) and optionally signals the AP with
  67  * an interrupt.  Event structures are implemented by another ring
  68  * buffer, directed toward the AP from the IPA.
  69  *
  70  * The input to a GSI channel is a FIFO of type/length/value (TLV)
  71  * elements, and the size of this FIFO limits the number of TREs
  72  * that can be included in a single transaction.
  73  */
  74 struct gsi_channel_data {
  75         u16 tre_count;
  76         u16 event_count;
  77         u8 tlv_count;
  78 };
  79
  80 /**
  81  * struct ipa_endpoint_tx_data - configuration data for TX endpoints
  82  * @status_endpoint:    endpoint to which status elements are sent
  83  * @delay:              whether endpoint starts in delay mode
  84  *
  85  * Delay mode prevents a TX endpoint from transmitting anything, even if
  86  * commands have been presented to the hardware.  Once the endpoint exits
  87  * delay mode, queued transfer commands are sent.
  88  *
  89  * The @status_endpoint is only valid if the endpoint's @status_enable
  90  * flag is set.
  91  */
  92 struct ipa_endpoint_tx_data {
  93         enum ipa_endpoint_name status_endpoint;
  94         bool delay;
  95 };
  96
  97 /**
  98  * struct ipa_endpoint_rx_data - configuration data for RX endpoints
  99  * @pad_align:  power-of-2 boundary to which packet payload is aligned
 100  * @aggr_close_eof: whether aggregation closes on end-of-frame
 101  *
 102  * With each packet it transfers, the IPA hardware can perform certain
 103  * transformations of its packet data.  One of these is adding pad bytes
 104  * to the end of the packet data so the result ends on a power-of-2 boundary.
 105  *
 106  * It is also able to aggregate multiple packets into a single receive buffer.
 107  * Aggregation is "open" while a buffer is being filled, and "closes" when
 108  * certain criteria are met.  One of those criteria is the sender indicating
 109  * a "frame" consisting of several transfers has ended.
 110  */
 111 struct ipa_endpoint_rx_data {
 112         u32 pad_align;
 113         bool aggr_close_eof;
 114 };
 115
 116 /**
 117  * struct ipa_endpoint_config_data - IPA endpoint hardware configuration
 118  * @checksum:           whether checksum offload is enabled
 119  * @qmap:               whether endpoint uses QMAP protocol
 120  * @aggregation:        whether endpoint supports aggregation
 121  * @status_enable:      whether endpoint uses status elements
 122  * @dma_mode:           whether endpoint operates in DMA mode
 123  * @dma_endpoint:       peer endpoint, if operating in DMA mode
 124  * @tx:                 TX-specific endpoint information (see above)
 125  * @rx:                 RX-specific endpoint information (see above)
 126  */
 127 struct ipa_endpoint_config_data {
 128         bool checksum;
 129         bool qmap;
 130         bool aggregation;
 131         bool status_enable;
 132         bool dma_mode;
 133         enum ipa_endpoint_name dma_endpoint;
 134         union {
 135                 struct ipa_endpoint_tx_data tx;
 136                 struct ipa_endpoint_rx_data rx;
 137         };
 138 };
 139
 140 /**
 141  * struct ipa_endpoint_data - IPA endpoint configuration data
 142  * @filter_support:     whether endpoint supports filtering
 143  * @seq_type:           hardware sequencer type used for endpoint
 144  * @config:             hardware configuration (see above)
 145  *
 146  * Not all endpoints support the IPA filtering capability.  A filter table
 147  * defines the filters to apply for those endpoints that support it.  The
 148  * AP is responsible for initializing this table, and it must include entries
 149  * for non-AP endpoints.  For this reason we define *all* endpoints used
 150  * in the system, and indicate whether they support filtering.
 151  *
 152  * The remaining endpoint configuration data applies only to AP endpoints.
 153  * The IPA hardware is implemented by sequencers, and the AP must program
 154  * the type(s) of these sequencers at initialization time.  The remaining
 155  * endpoint configuration data is defined above.
 156  */
 157 struct ipa_endpoint_data {
 158         bool filter_support;
 159         /* The next two are specified only for AP endpoints */
 160         enum ipa_seq_type seq_type;
 161         struct ipa_endpoint_config_data config;
 162 };
 163
 164 /**
 165  * struct ipa_gsi_endpoint_data - GSI channel/IPA endpoint data
 166  * ee:          GSI execution environment ID
 167  * channel_id:  GSI channel ID
 168  * endpoint_id: IPA endpoint ID
 169  * toward_ipa:  direction of data transfer
 170  * gsi:         GSI channel configuration data (see above)
 171  * ipa:         IPA endpoint configuration data (see above)
 172  */
 173 struct ipa_gsi_endpoint_data {
 174         u8 ee_id;               /* enum gsi_ee_id */
 175         u8 channel_id;
 176         u8 endpoint_id;
 177         bool toward_ipa;
 178
 179         struct gsi_channel_data channel;
 180         struct ipa_endpoint_data endpoint;
 181 };
 182
 183 /** enum ipa_resource_type_src - source resource types */
 184 enum ipa_resource_type_src {
 185         IPA_RESOURCE_TYPE_SRC_PKT_CONTEXTS,
 186         IPA_RESOURCE_TYPE_SRC_DESCRIPTOR_LISTS,
 187         IPA_RESOURCE_TYPE_SRC_DESCRIPTOR_BUFF,
 188         IPA_RESOURCE_TYPE_SRC_HPS_DMARS,
 189         IPA_RESOURCE_TYPE_SRC_ACK_ENTRIES,
 190 };
 191
 192 /** enum ipa_resource_type_dst - destination resource types */
 193 enum ipa_resource_type_dst {
 194         IPA_RESOURCE_TYPE_DST_DATA_SECTORS,
 195         IPA_RESOURCE_TYPE_DST_DPS_DMARS,
 196 };
 197
 198 /**
 199  * struct ipa_resource_limits - minimum and maximum resource counts
 200  * @min:        minimum number of resources of a given type
 201  * @max:        maximum number of resources of a given type
 202  */
 203 struct ipa_resource_limits {
 204         u32 min;
 205         u32 max;
 206 };
 207
 208 /**
 209  * struct ipa_resource_src - source endpoint group resource usage
 210  * @type:       source group resource type
 211  * @limits:     array of limits to use for each resource group
 212  */
 213 struct ipa_resource_src {
 214         enum ipa_resource_type_src type;
 215         struct ipa_resource_limits limits[IPA_RESOURCE_GROUP_COUNT];
 216 };
 217
 218 /**
 219  * struct ipa_resource_dst - destination endpoint group resource usage
 220  * @type:       destination group resource type
 221  * @limits:     array of limits to use for each resource group
 222  */
 223 struct ipa_resource_dst {
 224         enum ipa_resource_type_dst type;
 225         struct ipa_resource_limits limits[IPA_RESOURCE_GROUP_COUNT];
 226 };
 227
 228 /**
 229  * struct ipa_resource_data - IPA resource configuration data
 230  * @resource_src_count: number of entries in the resource_src array
 231  * @resource_src:       source endpoint group resources
 232  * @resource_dst_count: number of entries in the resource_dst array
 233  * @resource_dst:       destination endpoint group resources
 234  *
 235  * In order to manage quality of service between endpoints, certain resources
 236  * required for operation are allocated to groups of endpoints.  Generally
 237  * this information is invisible to the AP, but the AP is responsible for
 238  * programming it at initialization time, so we specify it here.
 239  */
 240 struct ipa_resource_data {
 241         u32 resource_src_count;
 242         const struct ipa_resource_src *resource_src;
 243         u32 resource_dst_count;
 244         const struct ipa_resource_dst *resource_dst;
 245 };
 246
 247 /**
 248  * struct ipa_mem - IPA-local memory region description
 249  * @offset:             offset in IPA memory space to base of the region
 250  * @size:               size in bytes base of the region
 251  * @canary_count:       number of 32-bit "canary" values that precede region
 252  */
 253 struct ipa_mem_data {
 254         u32 offset;
 255         u16 size;
 256         u16 canary_count;
 257 };
 258
 259 /**
 260  * struct ipa_data - combined IPA/GSI configuration data
 261  * @version:            IPA hardware version
 262  * @endpoint_count:     number of entries in endpoint_data array
 263  * @endpoint_data:      IPA endpoint/GSI channel data
 264  * @resource_data:      IPA resource configuration data
 265  * @mem_count:          number of entries in mem_data array
 266  * @mem_data:           IPA-local shared memory region data
 267  */
 268 struct ipa_data {
 269         enum ipa_version version;
 270         u32 endpoint_count;     /* # entries in endpoint_data[] */
 271         const struct ipa_gsi_endpoint_data *endpoint_data;
 272         const struct ipa_resource_data *resource_data;
 273         u32 mem_count;          /* # entries in mem_data[] */
 274         const struct ipa_mem *mem_data;
 275 };
 276
 277 extern const struct ipa_data ipa_data_sdm845;
 278 extern const struct ipa_data ipa_data_sc7180;
 279
 280 #endif /* _IPA_DATA_H_ */