1 /* 2 * This program is free software; you can redistribute it and/or modify it 3 * under the terms of the GNU General Public License version 2 as published 4 * by the Free Software Foundation. 5 * 6 * This program is distributed in the hope that it will be useful, 7 * but WITHOUT ANY WARRANTY; without even the implied warranty of 8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 9 * GNU General Public License for more details. 10 * 11 * You should have received a copy of the GNU General Public License 12 * along with this program; if not, write to the Free Software 13 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. 14 * 15 * Copyright (C) 2011 John Crispin <john@phrozen.org> 16 */ 17 18 #ifndef LTQ_DMA_H__ 19 #define LTQ_DMA_H__ 20 21 #define LTQ_DESC_SIZE 0x08 /* each descriptor is 64bit */ 22 #define LTQ_DESC_NUM 0x40 /* 64 descriptors / channel */ 23 24 #define LTQ_DMA_OWN BIT(31) /* owner bit */ 25 #define LTQ_DMA_C BIT(30) /* complete bit */ 26 #define LTQ_DMA_SOP BIT(29) /* start of packet */ 27 #define LTQ_DMA_EOP BIT(28) /* end of packet */ 28 #define LTQ_DMA_TX_OFFSET(x) ((x & 0x1f) << 23) /* data bytes offset */ 29 #define LTQ_DMA_RX_OFFSET(x) ((x & 0x7) << 23) /* data bytes offset */ 30 #define LTQ_DMA_SIZE_MASK (0xffff) /* the size field is 16 bit */ 31 32 struct ltq_dma_desc { 33 u32 ctl; 34 u32 addr; 35 }; 36 37 struct ltq_dma_channel { 38 int nr; /* the channel number */ 39 int irq; /* the mapped irq */ 40 int desc; /* the current descriptor */ 41 struct ltq_dma_desc *desc_base; /* the descriptor base */ 42 int phys; /* physical addr */ 43 }; 44 45 enum { 46 DMA_PORT_ETOP = 0, 47 DMA_PORT_DEU, 48 }; 49 50 extern void ltq_dma_enable_irq(struct ltq_dma_channel *ch); 51 extern void ltq_dma_disable_irq(struct ltq_dma_channel *ch); 52 extern void ltq_dma_ack_irq(struct ltq_dma_channel *ch); 53 extern void ltq_dma_open(struct ltq_dma_channel *ch); 54 extern void ltq_dma_close(struct ltq_dma_channel *ch); 55 extern void ltq_dma_alloc_tx(struct ltq_dma_channel *ch); 56 extern void ltq_dma_alloc_rx(struct ltq_dma_channel *ch); 57 extern void ltq_dma_free(struct ltq_dma_channel *ch); 58 extern void ltq_dma_init_port(int p); 59 60 #endif 61