| /* |
| * misc.c |
| * |
| * Copyright (C) 2019-2020 Sylvain Munaut <tnt@246tNt.com> |
| * SPDX-License-Identifier: GPL-3.0-or-later |
| */ |
| |
| #include <stdbool.h> |
| #include <stdint.h> |
| |
| #include "config.h" |
| #include "misc.h" |
| |
| |
| struct misc { |
| uint32_t warmboot; |
| uint32_t gpio; |
| uint32_t e1_led; |
| uint32_t _rsvd; |
| struct { |
| uint16_t rx; |
| uint16_t tx; |
| } e1_tick[2]; |
| struct { |
| uint32_t pps; |
| uint32_t now; |
| } time; |
| uint32_t pdm[8]; |
| } __attribute__((packed,aligned(4))); |
| |
| static volatile struct misc * const misc_regs = (void*)(MISC_BASE); |
| |
| |
| static const int pdm_bits[5] = { 12, 12, 8, 8, 8 }; |
| |
| |
| void |
| pdm_set(int chan, bool enable, unsigned value, bool normalize) |
| { |
| if (normalize) |
| value >>= (16 - pdm_bits[chan]); |
| if (enable) |
| value |= 0x80000000; |
| misc_regs->pdm[chan] = value; |
| } |
| |
| |
| uint16_t |
| e1_tick_read(void) |
| { |
| return misc_regs->e1_tick[0].tx; |
| } |