Qualcomm Kernel » History » Version 3
laforge, 10/01/2016 03:51 PM
| 1 | 1 | laforge | h1. Qualcomm Kernel |
|---|---|---|---|
| 2 | |||
| 3 | Random notes about the Qualcomm Kernel as used on the MDM9615 |
||
| 4 | |||
| 5 | h2. diag |
||
| 6 | |||
| 7 | h3. diag forwarding |
||
| 8 | |||
| 9 | <pre> |
||
| 10 | drivers/char/diag/diagfwd.[ch] |
||
| 11 | drivers/usb/gadget/f_diag.[ch] |
||
| 12 | drivers/usb/misc/diag_bridge.c |
||
| 13 | </pre> |
||
| 14 | |||
| 15 | * the usb diag gadget handles diag packet read/write over usb |
||
| 16 | * issues events like USB_DIAG_READ_DONE |
||
| 17 | * picked up by diagfwd.c |
||
| 18 | ** can forward diag requests via SMD shared memory to other processors |
||
| 19 | |||
| 20 | h3. diag char |
||
| 21 | |||
| 22 | <pre> |
||
| 23 | drivers/char/diag/diagchar_core.c |
||
| 24 | </pre> |
||
| 25 | |||
| 26 | * ioctl()s for diag configuration |
||
| 27 | * supports several concurrent diag clients |
||
| 28 | * diag logging can be directed to USB/HSIC, character device and more |
||
| 29 | ** {USB,CALLBACK,MEMORY_DEVICE,UART,NO_LOGGING}_MODE |
||
| 30 | |||
| 31 | driver/schar/diag/diag_dci.c |
||
| 32 | |||
| 33 | * DCI table is a routing table where pid/sockets can register for a |
||
| 34 | given DCI. socket close/cleanup code releases all DCI routes for |
||
| 35 | that socket. |
||
| 36 | |||
| 37 | h2. SMD (shared memory) |
||
| 38 | |||
| 39 | * SMD sub-systems: |
||
| 40 | ** Modem (assumed to be hexagon with modem firmware?) |
||
| 41 | ** Q6 (formerly known as LPASS == Low Power Audio SubSystem) |
||
| 42 | ** DSPS |
||
| 43 | ** WCNSS (Wireless Connectivity Sub System) aka 'riva' |
||
| 44 | ** RPM (Resource Power Manager) |
||
| 45 | * inter-processor-interrupts for various 'edges' |
||
| 46 | |||
| 47 | h3. core driver |
||
| 48 | |||
| 49 | * arch/arm/mach-msm/smd.c |
||
| 50 | |||
| 51 | h4. api |
||
| 52 | * smd_open() |
||
| 53 | * smd_close() |
||
| 54 | * smd_write*() |
||
| 55 | * smd_read*() |
||
| 56 | 2 | laforge | * smsm_*() |
| 57 | 1 | laforge | |
| 58 | |||
| 59 | 3 | laforge | h3. MSM IPC socket |
| 60 | 1 | laforge | |
| 61 | * arch/arm/mach-msm/ipc_socket.c |
||
| 62 | * AF_MSM_IPC |
||
| 63 | |||
| 64 | 3 | laforge | |
| 65 | h3. packet ports |
||
| 66 | 1 | laforge | |
| 67 | * Some kind of packet oriented interface towards the SMD |
||
| 68 | * msm_smd_pkt.c contains driver |
||
| 69 | ** smdpkt0..7+smd22 devices, 2048 byte buffer |
||
| 70 | ** open/release/read/write/poll syscalls implemented |
