Add support for cp2102 simple control cicuits.

This patch factors out the low-level routines to control a CP2102
to cp210x_controller.py.

command_processor.py provides a framework for defining
commands and to specify options. It represents the board
independet boilerplate code.

cp2102_haikou.py contains the commands to control a Haikou-like
circuit.

cp2102_simple.py contains the commands to control a simple control
circuit.

The board files cp2102-mini-evk.py, haikou.py, and telaviv.py
are the front-ends to control the specified boards.

Signed-off-by: Christoph Muellner <christoph.muellner@theobroma-systems.com>

1 files changed, 113 insertions, 0 deletions

diff --git a/usb-control/cp2102_simple.py b/usb-control/cp2102_simple.py
new file mode 100644
index 0000000..c4b2924
--- /dev/null
+++ b/usb-control/cp2102_simple.py
@@ -0,0 +1,113 @@
+#!/usr/bin/env python
+
+"""
+Abstraction layer for simple control circuits.
+The simple control circuit can control the reset
+signal via GPIO.0 and the maskrom signal via GPIO.1.
+"""
+
+__copyright__ = 'Copyright (C) 2019 Theobroma Systems Design und Consulting GmbH'
+__license__ = 'MIT'
+
+import sys
+import time
+import command_processor
+import cp210x_controller
+
+# Power supply GPIO
+GPIO_RESET = 0
+VALUE_RESET_DEASSERT = 0
+VALUE_RESET_ASSERT = 1
+
+# Maskrom (BIOS disable) GPIO
+GPIO_MASKROM = 1
+VALUE_MASKROM_DEASSERT = 0
+VALUE_MASKROM_ASSERT = 1
+
+def invert_reset():
+    global VALUE_RESET_DEASSERT
+    global VALUE_RESET_ASSERT
+    VALUE_RESET_DEASSERT = 1
+    VALUE_RESET_ASSERT = 0
+
+def invert_maskrom():
+    global VALUE_MASKROM_DEASSERT
+    global VALUE_MASKROM_ASSERT
+    VALUE_MASKROM_DEASSERT = 1
+    VALUE_MASKROM_ASSERT = 0
+
+def do_status(dev):
+    resetstate = cp210x_controller.get_gpio(dev, GPIO_RESET)
+    bootmode = cp210x_controller.get_gpio(dev, GPIO_MASKROM)
+    print "Board is {} ({})".format(
+        ("running" if reset == RESETSTATE_DEASSERTED else "in reset"),
+        ("normal boot" if bootmode == VALUE_MASKROM_DEASSERTED else "boot to maskrom"))
+
+def do_reset_assert(dev):
+    cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_ASSERT)
+
+def do_reset_deassert(dev):
+    cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_DEASSERT)
+
+def do_reset(dev):
+    cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_ASSERT)
+    time.sleep(0.3)
+    cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_DEASSERT)
+
+def do_normalboot(dev):
+    cp210x_controller.set_gpio(dev, GPIO_MASKROM, VALUE_MASKROM_DEASSERT)
+
+def do_maskrom(dev):
+    cp210x_controller.set_gpio(dev, GPIO_MASKROM, VALUE_MASKROM_ASSERT)
+
+def do_reset_to_normal(dev):
+    cp210x_controller.set_gpio(dev, GPIO_MASKROM, VALUE_MASKROM_DEASSERT)
+    cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_ASSERT)
+    time.sleep(0.3)
+    cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_DEASSERT)
+
+def do_reset_to_maskrom(dev):
+    cp210x_controller.set_gpio(dev, GPIO_MASKROM, VALUE_MASKROM_ASSERT)
+    cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_ASSERT)
+    time.sleep(0.3)
+    cp210x_controller.set_gpio(dev, GPIO_RESET, VALUE_RESET_DEASSERT)
+    time.sleep(0.3)
+    cp210x_controller.set_gpio(dev, GPIO_MASKROM, VALUE_MASKROM_DEASSERT)
+
+def main(product_string):
+    options_dict = {
+        '--invert-reset': (invert_reset,
+            'invert voltage level of reset line'),
+        '--invert-maskrom': (invert_maskrom,
+            'invert voltage level of maskrom line')
+    }
+
+    command_dict = {
+        'status': (do_status,
+            'show status of attached board'),
+        'reset-assert': (do_reset_assert,
+            'assert the reset line'),
+        'reset-deassert': (do_reset_deassert,
+            'deassert the reset line'),
+        'reset': (do_reset,
+            'assert the reset line for 300 ms'),
+        'normalboot': (do_normalboot,
+            'set bootmode to normal boot'),
+        'maskrom': (do_maskrom,
+            'set bootmode to maskrom'),
+        'reset-to-normal': (do_reset_to_normal,
+            'reset with normal boot target'),
+        'reset-to-maskrom': (do_reset_to_maskrom,
+            'reset to maskrom')
+    }
+
+    # Create argparser object
+    cp = command_processor.CommandProcessor(product_string, options_dict,
+            command_dict)
+
+    # Valiate command line arguments and commands
+    cp.validate_commandline(sys.argv[1:])
+
+    # Start executing the commands
+    cp.run()
+