Harald Welte | c68af6a | 2017-04-30 21:21:52 +0200 | [diff] [blame] | 1 | #ifndef _SERCOMM_H |
| 2 | #define _SERCOMM_H |
| 3 | |
| 4 | #include <osmocom/core/msgb.h> |
| 5 | |
| 6 | #define HDLC_FLAG 0x7E |
| 7 | #define HDLC_ESCAPE 0x7D |
| 8 | |
| 9 | #define HDLC_C_UI 0x03 |
| 10 | #define HDLC_C_P_BIT (1 << 4) |
| 11 | #define HDLC_C_F_BIT (1 << 4) |
| 12 | |
| 13 | /* a low sercomm_dlci means high priority. A high DLCI means low priority */ |
| 14 | enum sercomm_dlci { |
| 15 | SC_DLCI_HIGHEST = 0, |
| 16 | SC_DLCI_DEBUG = 4, |
| 17 | SC_DLCI_L1A_L23 = 5, |
| 18 | SC_DLCI_LOADER = 9, |
| 19 | SC_DLCI_CONSOLE = 10, |
| 20 | SC_DLCI_ECHO = 128, |
| 21 | _SC_DLCI_MAX |
| 22 | }; |
| 23 | |
Harald Welte | 1358836 | 2017-04-30 23:57:55 +0200 | [diff] [blame] | 24 | struct osmo_sercomm_inst; |
| 25 | typedef void (*dlci_cb_t)(struct osmo_sercomm_inst *sercomm, uint8_t dlci, struct msgb *msg); |
Harald Welte | cc95f4b | 2017-04-30 21:39:33 +0200 | [diff] [blame] | 26 | |
Harald Welte | 1358836 | 2017-04-30 23:57:55 +0200 | [diff] [blame] | 27 | struct osmo_sercomm_inst { |
Harald Welte | cc95f4b | 2017-04-30 21:39:33 +0200 | [diff] [blame] | 28 | int initialized; |
| 29 | int uart_id; |
| 30 | |
| 31 | /* transmit side */ |
| 32 | struct { |
| 33 | struct llist_head dlci_queues[_SC_DLCI_MAX]; |
| 34 | struct msgb *msg; |
| 35 | int state; |
| 36 | uint8_t *next_char; |
| 37 | } tx; |
| 38 | |
| 39 | /* receive side */ |
| 40 | struct { |
| 41 | dlci_cb_t dlci_handler[_SC_DLCI_MAX]; |
Harald Welte | f6adcd7 | 2017-05-01 00:19:13 +0200 | [diff] [blame] | 42 | unsigned int msg_size; |
Harald Welte | cc95f4b | 2017-04-30 21:39:33 +0200 | [diff] [blame] | 43 | struct msgb *msg; |
| 44 | int state; |
| 45 | uint8_t dlci; |
| 46 | uint8_t ctrl; |
| 47 | } rx; |
| 48 | }; |
| 49 | |
| 50 | |
Harald Welte | c68af6a | 2017-04-30 21:21:52 +0200 | [diff] [blame] | 51 | #ifndef HOST_BUILD |
| 52 | #include <uart.h> |
| 53 | /* helper functions for target */ |
Harald Welte | 1358836 | 2017-04-30 23:57:55 +0200 | [diff] [blame] | 54 | void osmo_sercomm_bind_uart(struct osmo_sercomm_inst *sercomm, int uart); |
| 55 | int osmo_sercomm_get_uart(struct osmo_sercomm_inst *sercomm); |
| 56 | void osmo_sercomm_change_speed(struct osmo_sercomm_inst *sercomm, enum uart_baudrate bdrt); |
Harald Welte | c68af6a | 2017-04-30 21:21:52 +0200 | [diff] [blame] | 57 | #endif |
| 58 | |
Harald Welte | 1358836 | 2017-04-30 23:57:55 +0200 | [diff] [blame] | 59 | void osmo_sercomm_init(struct osmo_sercomm_inst *sercomm); |
| 60 | int osmo_sercomm_initialized(struct osmo_sercomm_inst *sercomm); |
Harald Welte | c68af6a | 2017-04-30 21:21:52 +0200 | [diff] [blame] | 61 | |
| 62 | /* User Interface: Tx */ |
| 63 | |
| 64 | /* user interface for transmitting messages for a given DLCI */ |
Harald Welte | 1358836 | 2017-04-30 23:57:55 +0200 | [diff] [blame] | 65 | void osmo_sercomm_sendmsg(struct osmo_sercomm_inst *sercomm, uint8_t dlci, struct msgb *msg); |
Harald Welte | c68af6a | 2017-04-30 21:21:52 +0200 | [diff] [blame] | 66 | /* how deep is the Tx queue for a given DLCI */ |
Harald Welte | 1358836 | 2017-04-30 23:57:55 +0200 | [diff] [blame] | 67 | unsigned int osmo_sercomm_tx_queue_depth(struct osmo_sercomm_inst *sercomm, uint8_t dlci); |
Harald Welte | c68af6a | 2017-04-30 21:21:52 +0200 | [diff] [blame] | 68 | |
| 69 | /* User Interface: Rx */ |
| 70 | |
| 71 | /* receiving messages for a given DLCI */ |
Harald Welte | 1358836 | 2017-04-30 23:57:55 +0200 | [diff] [blame] | 72 | int osmo_sercomm_register_rx_cb(struct osmo_sercomm_inst *sercomm, uint8_t dlci, dlci_cb_t cb); |
Harald Welte | c68af6a | 2017-04-30 21:21:52 +0200 | [diff] [blame] | 73 | |
| 74 | /* Driver Interface */ |
| 75 | |
| 76 | /* fetch one octet of to-be-transmitted serial data. returns 0 if no more data */ |
Harald Welte | 1358836 | 2017-04-30 23:57:55 +0200 | [diff] [blame] | 77 | int osmo_sercomm_drv_pull(struct osmo_sercomm_inst *sercomm, uint8_t *ch); |
Harald Welte | c68af6a | 2017-04-30 21:21:52 +0200 | [diff] [blame] | 78 | /* the driver has received one byte, pass it into sercomm layer. |
| 79 | returns 1 in case of success, 0 in case of unrecognized char */ |
Harald Welte | 1358836 | 2017-04-30 23:57:55 +0200 | [diff] [blame] | 80 | int osmo_sercomm_drv_rx_char(struct osmo_sercomm_inst *sercomm, uint8_t ch); |
Harald Welte | c68af6a | 2017-04-30 21:21:52 +0200 | [diff] [blame] | 81 | |
Harald Welte | 1358836 | 2017-04-30 23:57:55 +0200 | [diff] [blame] | 82 | static inline struct msgb *osmo_sercomm_alloc_msgb(unsigned int len) |
Harald Welte | c68af6a | 2017-04-30 21:21:52 +0200 | [diff] [blame] | 83 | { |
| 84 | return msgb_alloc_headroom(len+4, 4, "sercomm_tx"); |
| 85 | } |
| 86 | |
| 87 | #endif /* _SERCOMM_H */ |