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comparison target-utils/libbase/abbdrv.c @ 500:a04a145098f1

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target-utils: poweroff command does VRPCAUX cleanup for nTESTRESET
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 25 May 2019 22:35:51 +0000
parents 44a1de4264d8
children
comparison
equal deleted inserted replaced
499:44a1de4264d8 500:a04a145098f1
113 113
114 void 114 void
115 abb_power_off() 115 abb_power_off()
116 { 116 {
117 abb_init(); 117 abb_init();
118 /*
119 * If we booted via nTESTRESET, we need to clean up some state
120 * in a secret undocumented Iota register before we do the DEVOFF,
121 * otherwise subsequent switch-on via regular PWON button
122 * won't work correctly.
123 */
124 abb_unlock_page2();
125 abb_reg_write(VRPCAUX, 0x07);
118 serial_flush(); 126 serial_flush();
119 abb_reg_write(VRPCDEV, 0x01); 127 abb_reg_write(VRPCDEV, 0x01); /* DEVOFF */
120 /* 128 /*
121 * TWL3025 datasheet seems to indicate that the time for the DEVOFF 129 * TWL3025 datasheet seems to indicate that the time for the DEVOFF
122 * command to take effect is 5 cycles of the 32.768 kHz clock. 130 * command to take effect is 5 cycles of the 32.768 kHz clock.
123 * We'll do an ARM-timed delay of 10 ms before returning from 131 * We'll do an ARM-timed delay of 10 ms before returning from
124 * this function. 132 * this function.