hw/soc_dma.h

   1 /*
   2  * On-chip DMA controller framework.
   3  *
   4  * Copyright (C) 2008 Nokia Corporation
   5  * Written by Andrzej Zaborowski <andrew@openedhand.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 or
  10  * (at your option) version 3 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #ifndef HW_SOC_DMA_H
  22 #define HW_SOC_DMA_H 1
  23
  24
  25 #include "exec/memory.h"
  26 #include "hw/irq.h"
  27
  28 struct soc_dma_s;
  29 struct soc_dma_ch_s;
  30 typedef void (*soc_dma_io_t)(void *opaque, uint8_t *buf, int len);
  31 typedef void (*soc_dma_transfer_t)(struct soc_dma_ch_s *ch);
  32
  33 enum soc_dma_port_type {
  34     soc_dma_port_mem,
  35     soc_dma_port_fifo,
  36     soc_dma_port_other,
  37 };
  38
  39 enum soc_dma_access_type {
  40     soc_dma_access_const,
  41     soc_dma_access_linear,
  42     soc_dma_access_other,
  43 };
  44
  45 struct soc_dma_ch_s {
  46     /* Private */
  47     struct soc_dma_s *dma;
  48     int num;
  49     QEMUTimer *timer;
  50
  51     /* Set by soc_dma.c */
  52     int enable;
  53     int update;
  54
  55     /* This should be set by dma->setup_fn().  */
  56     int bytes;
  57     /* Initialised by the DMA module, call soc_dma_ch_update after writing.  */
  58     enum soc_dma_access_type type[2];
  59     hwaddr vaddr[2];    /* Updated by .transfer_fn().  */
  60     /* Private */
  61     void *paddr[2];
  62     soc_dma_io_t io_fn[2];
  63     void *io_opaque[2];
  64
  65     int running;
  66     soc_dma_transfer_t transfer_fn;
  67
  68     /* Set and used by the DMA module.  */
  69     void *opaque;
  70 };
  71
  72 struct soc_dma_s {
  73     /* Following fields are set by the SoC DMA module and can be used
  74      * by anybody.  */
  75     uint64_t drqbmp;    /* Is zeroed by soc_dma_reset() */
  76     qemu_irq *drq;
  77     void *opaque;
  78     int64_t freq;
  79     soc_dma_transfer_t transfer_fn;
  80     soc_dma_transfer_t setup_fn;
  81     /* Set by soc_dma_init() for use by the DMA module.  */
  82     struct soc_dma_ch_s *ch;
  83 };
  84
  85 /* Call to activate or stop a DMA channel.  */
  86 void soc_dma_set_request(struct soc_dma_ch_s *ch, int level);
  87 /* Call after every write to one of the following fields and before
  88  * calling soc_dma_set_request(ch, 1):
  89  *   ch->type[0...1],
  90  *   ch->vaddr[0...1],
  91  *   ch->paddr[0...1],
  92  * or after a soc_dma_port_add_fifo() or soc_dma_port_add_mem().  */
  93 void soc_dma_ch_update(struct soc_dma_ch_s *ch);
  94
  95 /* The SoC should call this when the DMA module is being reset.  */
  96 void soc_dma_reset(struct soc_dma_s *s);
  97 struct soc_dma_s *soc_dma_init(int n);
  98
  99 void soc_dma_port_add_fifo(struct soc_dma_s *dma, hwaddr virt_base,
 100                 soc_dma_io_t fn, void *opaque, int out);
 101 void soc_dma_port_add_mem(struct soc_dma_s *dma, uint8_t *phys_base,
 102                 hwaddr virt_base, size_t size);
 103
 104 static inline void soc_dma_port_add_fifo_in(struct soc_dma_s *dma,
 105                 hwaddr virt_base, soc_dma_io_t fn, void *opaque)
 106 {
 107     return soc_dma_port_add_fifo(dma, virt_base, fn, opaque, 0);
 108 }
 109
 110 static inline void soc_dma_port_add_fifo_out(struct soc_dma_s *dma,
 111                 hwaddr virt_base, soc_dma_io_t fn, void *opaque)
 112 {
 113     return soc_dma_port_add_fifo(dma, virt_base, fn, opaque, 1);
 114 }
 115
 116 #endif