src/jtag/drivers/cmsis_dap.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 #ifndef OPENOCD_JTAG_DRIVERS_CMSIS_DAP_H
   4 #define OPENOCD_JTAG_DRIVERS_CMSIS_DAP_H
   5
   6 #include <stdint.h>
   7
   8 struct cmsis_dap_backend;
   9 struct cmsis_dap_backend_data;
  10
  11 struct pending_transfer_result {
  12         uint8_t cmd;
  13         uint32_t data;
  14         void *buffer;
  15 };
  16
  17 /* Up to MIN(packet_count, MAX_PENDING_REQUESTS) requests may be issued
  18  * until the first response arrives */
  19 #define MAX_PENDING_REQUESTS 4
  20
  21 struct pending_request_block {
  22         struct pending_transfer_result *transfers;
  23         unsigned int transfer_count;
  24         uint8_t command;
  25 };
  26
  27 struct cmsis_dap {
  28         struct cmsis_dap_backend_data *bdata;
  29         const struct cmsis_dap_backend *backend;
  30         unsigned int packet_size;
  31         unsigned int packet_usable_size;
  32         unsigned int packet_buffer_size;
  33         uint8_t *packet_buffer;
  34         uint8_t *command;
  35         uint8_t *response;
  36
  37         /* DP/AP register r/w operation counters used for checking the packet size
  38          * that would result from the queue run */
  39         unsigned int write_count;
  40         unsigned int read_count;
  41
  42         /* We can use DAP_TransferBlock only if all SWD operations in the packet
  43          * are either all writes or all reads and use the same DP/AP register.
  44          * The following variables keep track of it */
  45         uint8_t common_swd_cmd;
  46         bool swd_cmds_differ;
  47
  48         /* Pending requests are organized as a FIFO - circular buffer */
  49         struct pending_request_block pending_fifo[MAX_PENDING_REQUESTS];
  50         unsigned int packet_count;
  51         unsigned int pending_fifo_put_idx, pending_fifo_get_idx;
  52         unsigned int pending_fifo_block_count;
  53
  54         uint16_t caps;
  55         uint8_t mode;
  56         uint32_t swo_buf_sz;
  57         bool trace_enabled;
  58 };
  59
  60 struct cmsis_dap_backend {
  61         const char *name;
  62         int (*open)(struct cmsis_dap *dap, uint16_t vids[], uint16_t pids[], const char *serial);
  63         void (*close)(struct cmsis_dap *dap);
  64         int (*read)(struct cmsis_dap *dap, int timeout_ms);
  65         int (*write)(struct cmsis_dap *dap, int len, int timeout_ms);
  66         int (*packet_buffer_alloc)(struct cmsis_dap *dap, unsigned int pkt_sz);
  67 };
  68
  69 extern const struct cmsis_dap_backend cmsis_dap_hid_backend;
  70 extern const struct cmsis_dap_backend cmsis_dap_usb_backend;
  71 extern const struct command_registration cmsis_dap_usb_subcommand_handlers[];
  72
  73 #define REPORT_ID_SIZE   1
  74
  75 #endif