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ti_wilink_st.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* * Shared Transport Header file * To be included by the protocol stack drivers for * Texas Instruments BT,FM and GPS combo chip drivers * and also serves the sub-modules of the shared transport driver. * * Copyright (C) 2009-2010 Texas Instruments * Author: Pavan Savoy <pavan_savoy@ti.com> */ #ifndef TI_WILINK_ST_H #define TI_WILINK_ST_H #include <linux/skbuff.h> /** * enum proto-type - The protocol on WiLink chips which share a * common physical interface like UART. */ enum proto_type { ST_BT, ST_FM, ST_GPS, ST_MAX_CHANNELS = 16, }; /** * struct st_proto_s - Per Protocol structure from BT/FM/GPS to ST * @type: type of the protocol being registered among the * available proto_type(BT, FM, GPS the protocol which share TTY). * @recv: the receiver callback pointing to a function in the * protocol drivers called by the ST driver upon receiving * relevant data. * @match_packet: reserved for future use, to make ST more generic * @reg_complete_cb: callback handler pointing to a function in protocol * handler called by ST when the pending registrations are complete. * The registrations are marked pending, in situations when fw * download is in progress. * @write: pointer to function in ST provided to protocol drivers from ST, * to be made use when protocol drivers have data to send to TTY. * @priv_data: privdate data holder for the protocol drivers, sent * from the protocol drivers during registration, and sent back on * reg_complete_cb and recv. * @chnl_id: channel id the protocol driver is interested in, the channel * id is nothing but the 1st byte of the packet in UART frame. * @max_frame_size: size of the largest frame the protocol can receive. * @hdr_len: length of the header structure of the protocol. * @offset_len_in_hdr: this provides the offset of the length field in the * header structure of the protocol header, to assist ST to know * how much to receive, if the data is split across UART frames. * @len_size: whether the length field inside the header is 2 bytes * or 1 byte. * @reserve: the number of bytes ST needs to reserve in the skb being * prepared for the protocol driver. */ struct st_proto_s { enum proto_type type; long (*recv) (void *, struct sk_buff *); unsigned char (*match_packet) (const unsigned char *data); void (*reg_complete_cb) (void *, int data); long (*write) (struct sk_buff *skb); void *priv_data; unsigned char chnl_id; unsigned short max_frame_size; unsigned char hdr_len; unsigned char offset_len_in_hdr; unsigned char len_size; unsigned char reserve; }; extern long st_register(struct st_proto_s *); extern long st_unregister(struct st_proto_s *); /* * header information used by st_core.c */ /* states of protocol list */ #define ST_NOTEMPTY 1 #define ST_EMPTY 0 /* * possible st_states */ #define ST_INITIALIZING 1 #define ST_REG_IN_PROGRESS 2 #define ST_REG_PENDING 3 #define ST_WAITING_FOR_RESP 4 /** * struct st_data_s - ST core internal structure * @st_state: different states of ST like initializing, registration * in progress, this is mainly used to return relevant err codes * when protocol drivers are registering. It is also used to track * the recv function, as in during fw download only HCI events * can occur , where as during other times other events CH8, CH9 * can occur. * @tty: tty provided by the TTY core for line disciplines. * @tx_skb: If for some reason the tty's write returns lesser bytes written * then to maintain the rest of data to be written on next instance. * This needs to be protected, hence the lock inside wakeup func. * @tx_state: if the data is being written onto the TTY and protocol driver * wants to send more, queue up data and mark that there is * more data to send. * @list: the list of protocols registered, only MAX can exist, one protocol * can register only once. * @rx_state: states to be maintained inside st's tty receive * @rx_count: count to be maintained inside st's tty receieve * @rx_skb: the skb where all data for a protocol gets accumulated, * since tty might not call receive when a complete event packet * is received, the states, count and the skb needs to be maintained. * @rx_chnl: the channel ID for which the data is getting accumalated for. * @txq: the list of skbs which needs to be sent onto the TTY. * @tx_waitq: if the chip is not in AWAKE state, the skbs needs to be queued * up in here, PM(WAKEUP_IND) data needs to be sent and then the skbs * from waitq can be moved onto the txq. * Needs locking too. * @lock: the lock to protect skbs, queues, and ST states. * @protos_registered: count of the protocols registered, also when 0 the * chip enable gpio can be toggled, and when it changes to 1 the fw * needs to be downloaded to initialize chip side ST. * @ll_state: the various PM states the chip can be, the states are notified * to us, when the chip sends relevant PM packets(SLEEP_IND, WAKE_IND). * @kim_data: reference to the parent encapsulating structure. * */ struct st_data_s { unsigned long st_state; struct sk_buff *tx_skb; #define ST_TX_SENDING 1 #define ST_TX_WAKEUP 2 unsigned long tx_state; struct st_proto_s *list[ST_MAX_CHANNELS]; bool is_registered[ST_MAX_CHANNELS]; unsigned long rx_state; unsigned long rx_count; struct sk_buff *rx_skb; unsigned char rx_chnl; struct sk_buff_head txq, tx_waitq; spinlock_t lock; unsigned char protos_registered; unsigned long ll_state; void *kim_data; struct tty_struct *tty; struct work_struct work_write_wakeup; }; /* * wrapper around tty->ops->write_room to check * availability during firmware download */ int st_get_uart_wr_room(struct st_data_s *st_gdata); /** * st_int_write - * point this to tty->driver->write or tty->ops->write * depending upon the kernel version */ int st_int_write(struct st_data_s*, const unsigned char*, int); /** * st_write - * internal write function, passed onto protocol drivers * via the write function ptr of protocol struct */ long st_write(struct sk_buff *); /* function to be called from ST-LL */ void st_ll_send_frame(enum proto_type, struct sk_buff *); /* internal wake up function */ void st_tx_wakeup(struct st_data_s *st_data); /* init, exit entry funcs called from KIM */ int st_core_init(struct st_data_s **); void st_core_exit(struct st_data_s *); /* ask for reference from KIM */ void st_kim_ref(struct st_data_s **, int); #define GPS_STUB_TEST #ifdef GPS_STUB_TEST int gps_chrdrv_stub_write(const unsigned char*, int); void gps_chrdrv_stub_init(void); #endif /* * header information used by st_kim.c */ /* time in msec to wait for * line discipline to be installed */ #define LDISC_TIME 1000 #define CMD_RESP_TIME 800 #define CMD_WR_TIME 5000 #define MAKEWORD(a, b) ((unsigned short)(((unsigned char)(a)) \ | ((unsigned short)((unsigned char)(b))) << 8)) #define GPIO_HIGH 1 #define GPIO_LOW 0 /* the Power-On-Reset logic, requires to attempt * to download firmware onto chip more than once * since the self-test for chip takes a while */ #define POR_RETRY_COUNT 5 /** * struct chip_version - save the chip version */ struct chip_version { unsigned short full; unsigned short chip; unsigned short min_ver; unsigned short maj_ver; }; #define UART_DEV_NAME_LEN 32 /** * struct kim_data_s - the KIM internal data, embedded as the * platform's drv data. One for each ST device in the system. * @uim_pid: KIM needs to communicate with UIM to request to install * the ldisc by opening UART when protocol drivers register. * @kim_pdev: the platform device added in one of the board-XX.c file * in arch/XX/ directory, 1 for each ST device. * @kim_rcvd: completion handler to notify when data was received, * mainly used during fw download, which involves multiple send/wait * for each of the HCI-VS commands. * @ldisc_installed: completion handler to notify that the UIM accepted * the request to install ldisc, notify from tty_open which suggests * the ldisc was properly installed. * @resp_buffer: data buffer for the .bts fw file name. * @fw_entry: firmware class struct to request/release the fw. * @rx_state: the rx state for kim's receive func during fw download. * @rx_count: the rx count for the kim's receive func during fw download. * @rx_skb: all of fw data might not come at once, and hence data storage for * whole of the fw response, only HCI_EVENTs and hence diff from ST's * response. * @core_data: ST core's data, which mainly is the tty's disc_data * @version: chip version available via a sysfs entry. * */ struct kim_data_s { long uim_pid; struct platform_device *kim_pdev; struct completion kim_rcvd, ldisc_installed; char resp_buffer[30]; const struct firmware *fw_entry; unsigned nshutdown; unsigned long rx_state; unsigned long rx_count; struct sk_buff *rx_skb; struct st_data_s *core_data; struct chip_version version; unsigned char ldisc_install; unsigned char dev_name[UART_DEV_NAME_LEN + 1]; unsigned flow_cntrl; unsigned baud_rate; }; /** * functions called when 1 of the protocol drivers gets * registered, these need to communicate with UIM to request * ldisc installed, read chip_version, download relevant fw */ long st_kim_start(void *); long st_kim_stop(void *); void st_kim_complete(void *); void kim_st_list_protocols(struct st_data_s *, void *); void st_kim_recv(void *disc_data, const u8 *data, size_t count); /* * BTS headers */ #define ACTION_SEND_COMMAND 1 #define ACTION_WAIT_EVENT 2 #define ACTION_SERIAL 3 #define ACTION_DELAY 4 #define ACTION_RUN_SCRIPT 5 #define ACTION_REMARKS 6 /** * struct bts_header - the fw file is NOT binary which can * be sent onto TTY as is. The .bts is more a script * file which has different types of actions. * Each such action needs to be parsed by the KIM and * relevant procedure to be called. */ struct bts_header { u32 magic; u32 version; u8 future[24]; u8 actions[]; } __attribute__ ((packed)); /** * struct bts_action - Each .bts action has its own type of * data. */ struct bts_action { u16 type; u16 size; u8 data[]; } __attribute__ ((packed)); struct bts_action_send { u8 data[0]; } __attribute__ ((packed)); struct bts_action_wait { u32 msec; u32 size; u8 data[]; } __attribute__ ((packed)); struct bts_action_delay { u32 msec; } __attribute__ ((packed)); struct bts_action_serial { u32 baud; u32 flow_control; } __attribute__ ((packed)); /** * struct hci_command - the HCI-VS for intrepreting * the change baud rate of host-side UART, which * needs to be ignored, since UIM would do that * when it receives request from KIM for ldisc installation. */ struct hci_command { u8 prefix; u16 opcode; u8 plen; u32 speed; } __attribute__ ((packed)); /* * header information used by st_ll.c */ /* ST LL receiver states */ #define ST_W4_PACKET_TYPE 0 #define ST_W4_HEADER 1 #define ST_W4_DATA 2 /* ST LL state machines */ #define ST_LL_ASLEEP 0 #define ST_LL_ASLEEP_TO_AWAKE 1 #define ST_LL_AWAKE 2 #define ST_LL_AWAKE_TO_ASLEEP 3 #define ST_LL_INVALID 4 /* different PM notifications coming from chip */ #define LL_SLEEP_IND 0x30 #define LL_SLEEP_ACK 0x31 #define LL_WAKE_UP_IND 0x32 #define LL_WAKE_UP_ACK 0x33 /* initialize and de-init ST LL */ long st_ll_init(struct st_data_s *); long st_ll_deinit(struct st_data_s *); /** * enable/disable ST LL along with KIM start/stop * called by ST Core */ void st_ll_enable(struct st_data_s *); void st_ll_disable(struct st_data_s *); /** * various funcs used by ST core to set/get the various PM states * of the chip. */ unsigned long st_ll_getstate(struct st_data_s *); unsigned long st_ll_sleep_state(struct st_data_s *, unsigned char); void st_ll_wakeup(struct st_data_s *); /* * header information used by st_core.c for FM and GPS * packet parsing, the bluetooth headers are already available * at net/bluetooth/ */ struct fm_event_hdr { u8 plen; } __attribute__ ((packed)); #define FM_MAX_FRAME_SIZE 0xFF /* TODO: */ #define FM_EVENT_HDR_SIZE 1 /* size of fm_event_hdr */ #define ST_FM_CH8_PKT 0x8 /* gps stuff */ struct gps_event_hdr { u8 opcode; u16 plen; } __attribute__ ((packed)); /** * struct ti_st_plat_data - platform data shared between ST driver and * platform specific board file which adds the ST device. * @nshutdown_gpio: Host's GPIO line to which chip's BT_EN is connected. * @dev_name: The UART/TTY name to which chip is interfaced. (eg: /dev/ttyS1) * @flow_cntrl: Should always be 1, since UART's CTS/RTS is used for PM * purposes. * @baud_rate: The baud rate supported by the Host UART controller, this will * be shared across with the chip via a HCI VS command from User-Space Init * Mgr application. * @suspend: * @resume: legacy PM routines hooked to platform specific board file, so as * to take chip-host interface specific action. * @chip_enable: * @chip_disable: Platform/Interface specific mux mode setting, GPIO * configuring, Host side PM disabling etc.. can be done here. * @chip_asleep: * @chip_awake: Chip specific deep sleep states is communicated to Host * specific board-xx.c to take actions such as cut UART clocks when chip * asleep or run host faster when chip awake etc.. * */ struct ti_st_plat_data { u32 nshutdown_gpio; unsigned char dev_name[UART_DEV_NAME_LEN]; /* uart name */ u32 flow_cntrl; /* flow control flag */ u32 baud_rate; int (*suspend)(struct platform_device *, pm_message_t); int (*resume)(struct platform_device *); int (*chip_enable) (struct kim_data_s *); int (*chip_disable) (struct kim_data_s *); int (*chip_asleep) (struct kim_data_s *); int (*chip_awake) (struct kim_data_s *); }; #endif /* TI_WILINK_ST_H */
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