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xlnx_dpdma.h (2704B)

      1 /*
      2  * xlnx_dpdma.h
      3  *
      4  *  Copyright (C) 2015 : GreenSocs Ltd
      5  *      http://www.greensocs.com/ , email: info@greensocs.com
      6  *
      7  *  Developed by :
      8  *  Frederic Konrad   <fred.konrad@greensocs.com>
      9  *
     10  * This program is free software; you can redistribute it and/or modify
     11  * it under the terms of the GNU General Public License as published by
     12  * the Free Software Foundation, either version 2 of the License, or
     13  * (at your option) any later version.
     14  *
     15  * This program is distributed in the hope that it will be useful,
     16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     18  * GNU General Public License for more details.
     19  *
     20  * You should have received a copy of the GNU General Public License along
     21  * with this program; if not, see <http://www.gnu.org/licenses/>.
     22  *
     23  */
     24 
     25 #ifndef XLNX_DPDMA_H
     26 #define XLNX_DPDMA_H
     27 
     28 #include "hw/sysbus.h"
     29 #include "ui/console.h"
     30 #include "sysemu/dma.h"
     31 #include "qom/object.h"
     32 
     33 #define XLNX_DPDMA_REG_ARRAY_SIZE (0x1000 >> 2)
     34 
     35 struct XlnxDPDMAState {
     36     /*< private >*/
     37     SysBusDevice parent_obj;
     38     /*< public >*/
     39     MemoryRegion iomem;
     40     uint32_t registers[XLNX_DPDMA_REG_ARRAY_SIZE];
     41     uint8_t *data[6];
     42     bool operation_finished[6];
     43     qemu_irq irq;
     44 };
     45 
     46 
     47 #define TYPE_XLNX_DPDMA "xlnx.dpdma"
     48 OBJECT_DECLARE_SIMPLE_TYPE(XlnxDPDMAState, XLNX_DPDMA)
     49 
     50 /*
     51  * xlnx_dpdma_start_operation: Start the operation on the specified channel. The
     52  *                             DPDMA gets the current descriptor and retrieves
     53  *                             data to the buffer specified by
     54  *                             dpdma_set_host_data_location().
     55  *
     56  * Returns The number of bytes transferred by the DPDMA
     57  *         or 0 if an error occurred.
     58  *
     59  * @s The DPDMA state.
     60  * @channel The channel to start.
     61  */
     62 size_t xlnx_dpdma_start_operation(XlnxDPDMAState *s, uint8_t channel,
     63                                   bool one_desc);
     64 
     65 /*
     66  * xlnx_dpdma_set_host_data_location: Set the location in the host memory where
     67  *                                    to store the data out from the dma
     68  *                                    channel.
     69  *
     70  * @s The DPDMA state.
     71  * @channel The channel associated to the pointer.
     72  * @p The buffer where to store the data.
     73  */
     74 /* XXX: add a maximum size arg and send an interrupt in case of overflow. */
     75 void xlnx_dpdma_set_host_data_location(XlnxDPDMAState *s, uint8_t channel,
     76                                        void *p);
     77 
     78 /*
     79  * xlnx_dpdma_trigger_vsync_irq: Trigger a VSYNC IRQ when the display is
     80  *                               updated.
     81  *
     82  * @s The DPDMA state.
     83  */
     84 void xlnx_dpdma_trigger_vsync_irq(XlnxDPDMAState *s);
     85 
     86 #endif /* XLNX_DPDMA_H */