2 * Copyright © 2012 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 struct ao_dma_config {
24 void (*isr)(int index);
27 uint8_t ao_dma_done[NUM_DMA];
29 static struct ao_dma_config ao_dma_config[NUM_DMA];
30 static uint8_t ao_dma_allocated[NUM_DMA];
31 static uint8_t ao_dma_mutex[NUM_DMA];
34 ao_dma_isr(uint8_t index) {
35 /* Get channel interrupt bits */
36 uint32_t isr = stm_dma.isr & (STM_DMA_ISR_MASK <<
41 if (ao_dma_config[index].isr)
42 (*ao_dma_config[index].isr)(index);
44 ao_dma_done[index] = 1;
45 ao_wakeup(&ao_dma_done[index]);
49 void stm_dma1_channel1_isr(void) { ao_dma_isr(STM_DMA_INDEX(1)); }
50 void stm_dma1_channel2_isr(void) { ao_dma_isr(STM_DMA_INDEX(2)); }
51 #ifdef STM_DMA1_3_STOLEN
54 void stm_dma1_channel3_isr(void) { ao_dma_isr(STM_DMA_INDEX(3)); }
56 void stm_dma1_channel4_isr(void) { ao_dma_isr(STM_DMA_INDEX(4)); }
57 #ifdef STM_DMA1_5_STOLEN
60 void stm_dma1_channel5_isr(void) { ao_dma_isr(STM_DMA_INDEX(5)); }
62 void stm_dma1_channel6_isr(void) { ao_dma_isr(STM_DMA_INDEX(6)); }
63 void stm_dma1_channel7_isr(void) { ao_dma_isr(STM_DMA_INDEX(7)); }
66 static uint8_t ao_dma_active;
70 ao_dma_mutex_get(uint8_t index)
72 if (ao_dma_allocated[index]) {
73 if (ao_dma_mutex[index])
74 ao_panic(AO_PANIC_DMA);
75 ao_dma_mutex[index] = 0xff;
77 ao_mutex_get(&ao_dma_mutex[index]);
81 ao_dma_mutex_put(uint8_t index)
83 if (ao_dma_allocated[index])
84 ao_dma_mutex[index] = 0;
86 ao_mutex_put(&ao_dma_mutex[index]);
91 ao_dma_set_transfer(uint8_t index,
92 volatile void *peripheral,
97 if (ao_dma_allocated[index]) {
98 if (ao_dma_mutex[index])
99 ao_panic(AO_PANIC_DMA);
100 ao_dma_mutex[index] = 0xff;
102 ao_mutex_get(&ao_dma_mutex[index]);
105 if (ao_dma_active++ == 0)
106 stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_DMA1EN);
109 stm_dma.channel[index].ccr = ccr | (1 << STM_DMA_CCR_TCIE);
110 stm_dma.channel[index].cndtr = count;
111 stm_dma.channel[index].cpar = peripheral;
112 stm_dma.channel[index].cmar = memory;
113 ao_dma_config[index].isr = NULL;
117 ao_dma_set_isr(uint8_t index, void (*isr)(int))
119 ao_dma_config[index].isr = isr;
123 ao_dma_start(uint8_t index)
125 ao_dma_done[index] = 0;
126 stm_dma.channel[index].ccr |= (1UL << STM_DMA_CCR_EN);
130 ao_dma_done_transfer(uint8_t index)
132 stm_dma.channel[index].ccr &= ~(1UL << STM_DMA_CCR_EN);
135 if (--ao_dma_active == 0)
136 stm_rcc.ahbenr &= ~(1UL << STM_RCC_AHBENR_DMA1EN);
139 if (ao_dma_allocated[index])
140 ao_dma_mutex[index] = 0;
142 ao_mutex_put(&ao_dma_mutex[index]);
146 ao_dma_alloc(uint8_t index)
148 if (ao_dma_allocated[index])
149 ao_panic(AO_PANIC_DMA);
150 ao_dma_allocated[index] = 1;
155 ao_dma_dump_cmd(void)
161 if (ao_dma_active++ == 0)
162 stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_DMA1EN);
165 printf ("isr %08x ifcr%08x\n", stm_dma.isr, stm_dma.ifcr);
166 for (i = 0; i < NUM_DMA; i++)
167 printf("%d: done %d allocated %d mutex %2d ccr %04x cndtr %04x cpar %08x cmar %08x isr %08x\n",
172 stm_dma.channel[i].ccr,
173 stm_dma.channel[i].cndtr,
174 stm_dma.channel[i].cpar,
175 stm_dma.channel[i].cmar,
176 ao_dma_config[i].isr);
179 if (--ao_dma_active == 0)
180 stm_rcc.ahbenr &= ~(1 << STM_RCC_AHBENR_DMA1EN);
185 static const struct ao_cmds ao_dma_cmds[] = {
186 { ao_dma_dump_cmd, "D\0Dump DMA status" },
197 stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_DMA1EN);
199 for (index = 0; index < STM_NUM_DMA; index++) {
200 #if STM_DMA1_5_STOLEN
201 if (index == STM_DMA_INDEX(5)) {
202 ao_dma_allocated[index] = 1;
203 ao_dma_mutex[index] = 0xff;
207 #if STM_DMA1_3_STOLEN
208 if (index == STM_DMA_INDEX(3)) {
209 ao_dma_allocated[index] = 1;
210 ao_dma_mutex[index] = 0xff;
214 stm_nvic_set_enable(STM_ISR_DMA1_CHANNEL1_POS + index);
215 stm_nvic_set_priority(STM_ISR_DMA1_CHANNEL1_POS + index,
216 AO_STM_NVIC_MED_PRIORITY);
217 ao_dma_allocated[index] = 0;
218 ao_dma_mutex[index] = 0;
221 ao_cmd_register(&ao_dma_cmds[0]);