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/* This file is part of the coreboot project. */
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* This is a driver for the Whirlwind LED ring, which is equipped with two LED
* microcontrollers TI LP55231 (http://www.ti.com/product/lp55231), each of
* them driving three multicolor LEDs.
*
* The only connection between the ring and the main board is an i2c bus.
*
* This driver imitates a depthcharge display device. On initialization the
* driver sets up the controllers to prepare them to accept programs to run.
*
* When a certain vboot state needs to be indicated, the program for that
* state is loaded into the controllers, resulting in the state appropriate
* LED behavior.
*/
#include "drivers/i2c/ww_ring/ww_ring_programs.h"
/****************************************************************
* LED ring program definitions for different patterns.
*
* Comments below are real lp55231 source code, they are compiled using
* lasm.exe, the TI tool available from their Web site (search for lp55231)
* and running only on Windows :P.
*
* Different hex dumps are results of tweaking the source code parameters to
* achieve desirable LED ring behavior. It is possible to use just one code
* dump and replace certain values in the body to achieve different behaviour
* with the same basic dump, but keeping track of location to tweak with every
* code change would be quite tedious.
*/
/*
* Solid LED display, the arguments of the set_pwm commands set intensity and
* color of the display:
row_red: dw 0000000000000001b
row_green: dw 0000000000000010b
row_blue: dw 0000000000000100b
.segment program1
mux_map_addr row_red
set_pwm 0
end
.segment program2
mux_map_addr row_green
set_pwm 0
end
.segment program3
mux_map_addr row_blue
set_pwm 0
end
*/
/* RGB set to 000000, resulting in all LEDs off. */
static const uint8_t solid_000000_text[] = {
0x00, 0x01, 0x00, 0x02, 0x00, 0x04, 0x9F, 0x80,
0x40, 0, 0xC0, 0x00, 0x9F, 0x81, 0x40, 0,
0xC0, 0x00, 0x9F, 0x82, 0x40, 0, 0xC0, 0x00
};
/* Rgb set to 128, resulting in a brightish white color. */
static const uint8_t solid_808080_text[] = {
0x00, 0x01, 0x00, 0x02, 0x00, 0x04, 0x9F, 0x80,
0x40, 128, 0xC0, 0x00, 0x9F, 0x81, 0x40, 128,
0xC0, 0x00, 0x9F, 0x82, 0x40, 128, 0xC0, 0x00
};
static const TiLp55231Program solid_808080_program = {
solid_808080_text,
sizeof(solid_808080_text),
0,
{ 3, 6, 9 }
};
static const TiLp55231Program solid_000000_program = {
solid_000000_text,
sizeof(solid_000000_text),
0,
{ 3, 6, 9 }
};
/*
* Blinking patterns are trickier then solid ones.
*
* The three internal engines seem to be competing for resources and get out
* of sync in seconds if left running asynchronously.
*
* When solid patterns are deployed with instanteneous color intensity
* changes, all three LEDs can be controlled by one engine in sequential
* accesses. But the controllers still neeed to be synchronized.
*
* The maximum timer duration of lp55231 is .48 seconds. To achieve longer
* blinking intervals the loops delays are deployed. Only the first controller
* intervals need to be changed, as the second one is in lockstep with the
* first.
*
* The time granularity is set at .1 second (see commands 'wait 0.1' in the
* code), and then the loop counters can be set up to 63 (registers rb and rc),
* which allows to generate intervals up to 6.3 seconds in .1 second
* increments.
*/
/*
* blink_solid1.src
row_red: dw 0000000000000001b
row_green: dw 0000000000000010b
row_blue: dw 0000000000000100b
.segment program1
ld ra, 2 # LED on duration
ld rb, 2 # LED off duration
mux_map_addr row_red
loop:
ld rc, 1 ; red intensity
set_pwm rc
mux_map_addr row_green
ld rc, 50 ; green intensity
set_pwm rc
mux_map_addr row_blue
ld rc, 155 ; blue intensity
set_pwm rc
wait1:
wait 0.1
branch ra, wait1
set_pwm 0
mux_map_addr row_green
set_pwm 0
mux_map_addr row_red
set_pwm 0
wait2:
wait 0.1
branch rb, wait2
branch 0, loop
.segment program2
end
.segment program3
end
*/
static const uint8_t blink_wipeout1_text[] = {
0x00, 0x01, 0x00, 0x02, 0x00, 0x04, 0x90, 0x02,
0x94, 0x02, 0x9f, 0x80, 0x98, 1, 0x84, 0x62,
0x9f, 0x81, 0x98, 50, 0x84, 0x62, 0x9f, 0x82,
0x98, 155, 0x84, 0x62, 0x4c, 0x00, 0x86, 0x2c,
0x40, 0x00, 0x9f, 0x81, 0x40, 0x00, 0x9f, 0x80,
0x40, 0x00, 0x4c, 0x00, 0x86, 0x49, 0xa0, 0x03,
0xc0, 0x00, 0xc0, 0x00, 0x00,
};
static const TiLp55231Program blink_wipeout1_program = {
blink_wipeout1_text,
sizeof(blink_wipeout1_text),
0,
{ 3, 24, 25, }
};
static const uint8_t blink_recovery1_text[] = {
0x00, 0x01, 0x00, 0x02, 0x00, 0x04, 0x90, 0x02,
0x94, 0x02, 0x9f, 0x80, 0x98, 255, 0x84, 0x62,
0x9f, 0x81, 0x98, 100, 0x84, 0x62, 0x9f, 0x82,
0x98, 10, 0x84, 0x62, 0x4c, 0x00, 0x86, 0x2c,
0x40, 0x00, 0x9f, 0x81, 0x40, 0x00, 0x9f, 0x80,
0x40, 0x00, 0x4c, 0x00, 0x86, 0x49, 0xa0, 0x03,
0xc0, 0x00, 0xc0, 0x00, 0x00,
};
static const TiLp55231Program blink_recovery1_program = {
blink_recovery1_text,
sizeof(blink_recovery1_text),
0,
{ 3, 24, 25, }
};
/*
* fade_in1.src
*
row_red: dw 0000000000000001b
row_green: dw 0000000000000010b
row_blue: dw 0000000000000100b
.segment program1
mux_map_addr row_red
set_pwm 1h
trigger s{2|3}
end
.segment program2
mux_map_addr row_green
set_pwm 0h
trigger w{1}
ramp 2, 50
end
.segment program3
mux_map_addr row_blue
set_pwm 0h
loop3: trigger w{1}
ramp 2, 155
end
*/
static const uint8_t fade_in1_text[] = {
0x00, 0x01, 0x00, 0x02, 0x00, 0x04, 0x9f, 0x80,
0x40, 0x01, 0xe0, 0x0c, 0xc0, 0x00, 0x9f, 0x81,
0x40, 0x00, 0xe0, 0x80, 0x46, 0x32, 0xc0, 0x00,
0x9f, 0x82, 0x40, 0x00, 0xe0, 0x80, 0x34, 0x9B,
0xc0, 0x00, 0x00,
};
static const TiLp55231Program fade_in1_program = {
fade_in1_text,
sizeof(fade_in1_text),
0,
{ 3, 7, 12, }
};
const WwRingStateProg wwr_state_programs[] = {
/*
* for test purposes the blank screen program is set to blinking, will
* be changed soon.
*/
{WWR_ALL_OFF, {&solid_000000_program} },
{WWR_RECOVERY_PUSHED, {&solid_808080_program} },
{WWR_WIPEOUT_REQUEST, {&blink_wipeout1_program} },
{WWR_RECOVERY_REQUEST, {&blink_recovery1_program} },
{WWR_NORMAL_BOOT, {&fade_in1_program} },
{}, /* Empty record to mark the end of the table. */
};
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