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jtag/drivers: Add dmem driver

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Direct memory driver support for CoreSight Access Port(AP).

Even though we emulate SWD (serial wire debug), we aren't actually
using swd. Instead, we are using a direct memory access to get to the
register set. This is similar in approach to other fast access native
drivers such as am335xgpio drivers.

Example operation on Texas Instrument's AM62x K3 SoC:

+-----------+
|  OpenOCD  |   SoC mem map
|    on     |--------------+
| Cortex-A53|              |
+-----------+              |
                           |
+-----------+        +-----v-----+
|Cortex-M4F |<───────|           |
+-----------+        |           |
                     |  DebugSS  |
+-----------+        |           |
|Cortex-M4F |<───────|           |
+-----------+        +-----------+

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Jason Peck <jpeck@ti.com>
Change-Id: I8470cb15348863dd844b2c0e3f63a9063cb032c6
Reviewed-on: https://review.openocd.org/c/openocd/+/7088
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Nishanth Menon
2022-07-14 16:37:54 -05:00
committed by Antonio Borneo
parent 02e4d7195c
commit 29a57545f6
6 changed files with 424 additions and 0 deletions
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src/jtag/interface.h
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@@ -370,6 +370,7 @@ extern struct adapter_driver at91rm9200_adapter_driver;
extern struct adapter_driver bcm2835gpio_adapter_driver;
extern struct adapter_driver buspirate_adapter_driver;
extern struct adapter_driver cmsis_dap_adapter_driver;
extern struct adapter_driver dmem_dap_adapter_driver;
extern struct adapter_driver dummy_adapter_driver;
extern struct adapter_driver ep93xx_adapter_driver;
extern struct adapter_driver esp_usb_adapter_driver;