1 /*
2 * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <stdio.h>
8 #include "hardware/dma.h"
9 #include "hardware/claim.h"
10
11 #define DMA_CHAN_STRIDE (DMA_CH1_CTRL_TRIG_OFFSET - DMA_CH0_CTRL_TRIG_OFFSET)
12 check_hw_size(dma_channel_hw_t, DMA_CHAN_STRIDE);
13 check_hw_layout(dma_hw_t, abort, DMA_CHAN_ABORT_OFFSET);
14
15 // sanity check
16 static_assert(__builtin_offsetof(dma_hw_t, ch[0].ctrl_trig) == DMA_CH0_CTRL_TRIG_OFFSET, "hw mismatch");
17 static_assert(__builtin_offsetof(dma_hw_t, ch[1].ctrl_trig) == DMA_CH1_CTRL_TRIG_OFFSET, "hw mismatch");
18
19 static_assert(NUM_DMA_CHANNELS <= 16, "");
20 static uint16_t _claimed;
21
dma_channel_claim(uint channel)22 void dma_channel_claim(uint channel) {
23 check_dma_channel_param(channel);
24 hw_claim_or_assert((uint8_t *) &_claimed, channel, "DMA channel %d is already claimed");
25 }
26
dma_claim_mask(uint32_t mask)27 void dma_claim_mask(uint32_t mask) {
28 for(uint i = 0; mask; i++, mask >>= 1u) {
29 if (mask & 1u) dma_channel_claim(i);
30 }
31 }
32
dma_channel_unclaim(uint channel)33 void dma_channel_unclaim(uint channel) {
34 check_dma_channel_param(channel);
35 hw_claim_clear((uint8_t *) &_claimed, channel);
36 }
37
dma_claim_unused_channel(bool required)38 int dma_claim_unused_channel(bool required) {
39 return hw_claim_unused_from_range((uint8_t*)&_claimed, required, 0, NUM_DMA_CHANNELS-1, "No DMA channels are available");
40 }
41
42 #ifndef NDEBUG
43
print_dma_ctrl(dma_channel_hw_t * channel)44 void print_dma_ctrl(dma_channel_hw_t *channel) {
45 uint32_t ctrl = channel->ctrl_trig;
46 int rgsz = (ctrl & DMA_CH0_CTRL_TRIG_RING_SIZE_BITS) >> DMA_CH0_CTRL_TRIG_RING_SIZE_LSB;
47 printf("(%08x) ber %d rer %d wer %d busy %d trq %d cto %d rgsl %d rgsz %d inw %d inr %d sz %d hip %d en %d",
48 (uint) ctrl,
49 ctrl & DMA_CH0_CTRL_TRIG_AHB_ERROR_BITS ? 1 : 0,
50 ctrl & DMA_CH0_CTRL_TRIG_READ_ERROR_BITS ? 1 : 0,
51 ctrl & DMA_CH0_CTRL_TRIG_WRITE_ERROR_BITS ? 1 : 0,
52 ctrl & DMA_CH0_CTRL_TRIG_BUSY_BITS ? 1 : 0,
53 (int) ((ctrl & DMA_CH0_CTRL_TRIG_TREQ_SEL_BITS) >> DMA_CH0_CTRL_TRIG_TREQ_SEL_LSB),
54 (int) ((ctrl & DMA_CH0_CTRL_TRIG_CHAIN_TO_BITS) >> DMA_CH0_CTRL_TRIG_CHAIN_TO_LSB),
55 ctrl & DMA_CH0_CTRL_TRIG_RING_SEL_BITS ? 1 : 0,
56 rgsz ? (1 << rgsz) : 0,
57 ctrl & DMA_CH0_CTRL_TRIG_INCR_WRITE_BITS ? 1 : 0,
58 ctrl & DMA_CH0_CTRL_TRIG_INCR_READ_BITS ? 1 : 0,
59 1 << ((ctrl & DMA_CH0_CTRL_TRIG_DATA_SIZE_BITS) >> DMA_CH0_CTRL_TRIG_DATA_SIZE_LSB),
60 ctrl & DMA_CH0_CTRL_TRIG_HIGH_PRIORITY_BITS ? 1 : 0,
61 ctrl & DMA_CH0_CTRL_TRIG_EN_BITS ? 1 : 0);
62 }
63
check_dma_channel_param_impl(uint channel)64 void check_dma_channel_param_impl(uint channel) {
65 valid_params_if(DMA, channel < NUM_DMA_CHANNELS);
66 }
67
68 #endif
69