1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Most ISHTP provider device and ISHTP logic declarations 4 * 5 * Copyright (c) 2003-2016, Intel Corporation. 6 */ 7 8 #ifndef _ISHTP_DEV_H_ 9 #define _ISHTP_DEV_H_ 10 11 #include <linux/types.h> 12 #include <linux/spinlock.h> 13 #include <linux/intel-ish-client-if.h> 14 #include "bus.h" 15 #include "hbm.h" 16 17 #define IPC_PAYLOAD_SIZE 128 18 #define ISHTP_RD_MSG_BUF_SIZE IPC_PAYLOAD_SIZE 19 #define IPC_FULL_MSG_SIZE 132 20 21 /* Number of messages to be held in ISR->BH FIFO */ 22 #define RD_INT_FIFO_SIZE 64 23 24 /* 25 * Number of IPC messages to be held in Tx FIFO, to be sent by ISR - 26 * Tx complete interrupt or RX_COMPLETE handler 27 */ 28 #define IPC_TX_FIFO_SIZE 512 29 30 /* 31 * Number of Maximum ISHTP Clients 32 */ 33 #define ISHTP_CLIENTS_MAX 256 34 35 /* 36 * Number of File descriptors/handles 37 * that can be opened to the driver. 38 * 39 * Limit to 255: 256 Total Clients 40 * minus internal client for ISHTP Bus Messages 41 */ 42 #define ISHTP_MAX_OPEN_HANDLE_COUNT (ISHTP_CLIENTS_MAX - 1) 43 44 /* Internal Clients Number */ 45 #define ISHTP_HOST_CLIENT_ID_ANY (-1) 46 #define ISHTP_HBM_HOST_CLIENT_ID 0 47 48 #define MAX_DMA_DELAY 20 49 50 /* ISHTP device states */ 51 enum ishtp_dev_state { 52 ISHTP_DEV_INITIALIZING = 0, 53 ISHTP_DEV_INIT_CLIENTS, 54 ISHTP_DEV_ENABLED, 55 ISHTP_DEV_RESETTING, 56 ISHTP_DEV_DISABLED, 57 ISHTP_DEV_POWER_DOWN, 58 ISHTP_DEV_POWER_UP 59 }; 60 const char *ishtp_dev_state_str(int state); 61 62 struct ishtp_cl; 63 64 /** 65 * struct ishtp_fw_client - representation of fw client 66 * 67 * @props - client properties 68 * @client_id - fw client id 69 */ 70 struct ishtp_fw_client { 71 struct ishtp_client_properties props; 72 uint8_t client_id; 73 }; 74 75 /* 76 * Control info for IPC messages ISHTP/IPC sending FIFO - 77 * list with inline data buffer 78 * This structure will be filled with parameters submitted 79 * by the caller glue layer 80 * 'buf' may be pointing to the external buffer or to 'inline_data' 81 * 'offset' will be initialized to 0 by submitting 82 * 83 * 'ipc_send_compl' is intended for use by clients that send fragmented 84 * messages. When a fragment is sent down to IPC msg regs, 85 * it will be called. 86 * If it has more fragments to send, it will do it. With last fragment 87 * it will send appropriate ISHTP "message-complete" flag. 88 * It will remove the outstanding message 89 * (mark outstanding buffer as available). 90 * If counting flow control is in work and there are more flow control 91 * credits, it can put the next client message queued in cl. 92 * structure for IPC processing. 93 * 94 */ 95 struct wr_msg_ctl_info { 96 /* Will be called with 'ipc_send_compl_prm' as parameter */ 97 void (*ipc_send_compl)(void *); 98 99 void *ipc_send_compl_prm; 100 size_t length; 101 struct list_head link; 102 unsigned char inline_data[IPC_FULL_MSG_SIZE]; 103 }; 104 105 /* 106 * The ISHTP layer talks to hardware IPC message using the following 107 * callbacks 108 */ 109 struct ishtp_hw_ops { 110 int (*hw_reset)(struct ishtp_device *dev); 111 int (*ipc_reset)(struct ishtp_device *dev); 112 uint32_t (*ipc_get_header)(struct ishtp_device *dev, int length, 113 int busy); 114 int (*write)(struct ishtp_device *dev, 115 void (*ipc_send_compl)(void *), void *ipc_send_compl_prm, 116 unsigned char *msg, int length); 117 uint32_t (*ishtp_read_hdr)(const struct ishtp_device *dev); 118 int (*ishtp_read)(struct ishtp_device *dev, unsigned char *buffer, 119 unsigned long buffer_length); 120 uint32_t (*get_fw_status)(struct ishtp_device *dev); 121 void (*sync_fw_clock)(struct ishtp_device *dev); 122 bool (*dma_no_cache_snooping)(struct ishtp_device *dev); 123 }; 124 125 /** 126 * struct ishtp_driver_data - Driver-specific data for ISHTP devices 127 * 128 * This structure holds driver-specific data that can be associated with each 129 * ISHTP device instance. It allows for the storage of data that is unique to 130 * a particular driver or hardware variant. 131 * 132 * @fw_filename: The firmware filename associated with a specific hardware 133 * variant of the Intel Integrated Sensor Hub (ISH). This allows 134 * the driver to load the correct firmware based on the device's 135 * hardware variant. 136 */ 137 struct ishtp_driver_data { 138 char *fw_filename; 139 }; 140 141 /** 142 * struct ishtp_device - ISHTP private device struct 143 */ 144 struct ishtp_device { 145 struct device *devc; /* pointer to lowest device */ 146 struct pci_dev *pdev; /* PCI device to get device ids */ 147 struct ishtp_driver_data *driver_data; /* pointer to driver-specific data */ 148 149 /* waitq for waiting for suspend response */ 150 wait_queue_head_t suspend_wait; 151 bool suspend_flag; /* Suspend is active */ 152 153 /* waitq for waiting for resume response */ 154 wait_queue_head_t resume_wait; 155 bool resume_flag; /*Resume is active */ 156 157 /* 158 * lock for the device, for everything that doesn't have 159 * a dedicated spinlock 160 */ 161 spinlock_t device_lock; 162 163 bool recvd_hw_ready; 164 struct hbm_version version; 165 int transfer_path; /* Choice of transfer path: IPC or DMA */ 166 167 /* work structure for scheduling firmware loading tasks */ 168 struct work_struct work_fw_loader; 169 /* waitq for waiting for command response from the firmware loader */ 170 wait_queue_head_t wait_loader_recvd_msg; 171 /* indicating whether a message from the firmware loader has been received */ 172 bool fw_loader_received; 173 /* pointer to a buffer for receiving messages from the firmware loader */ 174 void *fw_loader_rx_buf; 175 /* size of the buffer pointed to by fw_loader_rx_buf */ 176 int fw_loader_rx_size; 177 178 /* ishtp device states */ 179 enum ishtp_dev_state dev_state; 180 enum ishtp_hbm_state hbm_state; 181 182 /* driver read queue */ 183 struct ishtp_cl_rb read_list; 184 spinlock_t read_list_spinlock; 185 186 /* list of ishtp_cl's */ 187 struct list_head cl_list; 188 spinlock_t cl_list_lock; 189 long open_handle_count; 190 191 /* List of bus devices */ 192 struct list_head device_list; 193 spinlock_t device_list_lock; 194 195 /* waiting queues for receive message from FW */ 196 wait_queue_head_t wait_hw_ready; 197 wait_queue_head_t wait_hbm_recvd_msg; 198 199 /* FIFO for input messages for BH processing */ 200 unsigned char rd_msg_fifo[RD_INT_FIFO_SIZE * IPC_PAYLOAD_SIZE]; 201 unsigned int rd_msg_fifo_head, rd_msg_fifo_tail; 202 spinlock_t rd_msg_spinlock; 203 struct work_struct bh_hbm_work; 204 205 /* IPC write queue */ 206 struct list_head wr_processing_list, wr_free_list; 207 /* For both processing list and free list */ 208 spinlock_t wr_processing_spinlock; 209 210 struct ishtp_fw_client *fw_clients; /*Note:memory has to be allocated*/ 211 DECLARE_BITMAP(fw_clients_map, ISHTP_CLIENTS_MAX); 212 DECLARE_BITMAP(host_clients_map, ISHTP_CLIENTS_MAX); 213 uint8_t fw_clients_num; 214 uint8_t fw_client_presentation_num; 215 uint8_t fw_client_index; 216 spinlock_t fw_clients_lock; 217 218 /* TX DMA buffers and slots */ 219 int ishtp_host_dma_enabled; 220 void *ishtp_host_dma_tx_buf; 221 unsigned int ishtp_host_dma_tx_buf_size; 222 uint64_t ishtp_host_dma_tx_buf_phys; 223 int ishtp_dma_num_slots; 224 225 /* map of 4k blocks in Tx dma buf: 0-free, 1-used */ 226 uint8_t *ishtp_dma_tx_map; 227 spinlock_t ishtp_dma_tx_lock; 228 229 /* RX DMA buffers and slots */ 230 void *ishtp_host_dma_rx_buf; 231 unsigned int ishtp_host_dma_rx_buf_size; 232 uint64_t ishtp_host_dma_rx_buf_phys; 233 234 /* Dump to trace buffers if enabled*/ 235 ishtp_print_log print_log; 236 237 /* Debug stats */ 238 unsigned int ipc_rx_cnt; 239 unsigned long long ipc_rx_bytes_cnt; 240 unsigned int ipc_tx_cnt; 241 unsigned long long ipc_tx_bytes_cnt; 242 243 const struct ishtp_hw_ops *ops; 244 size_t mtu; 245 uint32_t ishtp_msg_hdr; 246 char hw[] __aligned(sizeof(void *)); 247 }; 248 249 static inline unsigned long ishtp_secs_to_jiffies(unsigned long sec) 250 { 251 return msecs_to_jiffies(sec * MSEC_PER_SEC); 252 } 253 254 /* 255 * Register Access Function 256 */ 257 static inline int ish_ipc_reset(struct ishtp_device *dev) 258 { 259 return dev->ops->ipc_reset(dev); 260 } 261 262 /* Exported function */ 263 void ishtp_device_init(struct ishtp_device *dev); 264 int ishtp_start(struct ishtp_device *dev); 265 266 #endif /*_ISHTP_DEV_H_*/ 267