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 */ 87