diff options
Diffstat (limited to 'arch/arm/mach-aspeed/include/mach/ast-uart-dma.h')
| -rw-r--r-- | arch/arm/mach-aspeed/include/mach/ast-uart-dma.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/arch/arm/mach-aspeed/include/mach/ast-uart-dma.h b/arch/arm/mach-aspeed/include/mach/ast-uart-dma.h new file mode 100644 index 0000000..2ac2b41 --- /dev/null +++ b/arch/arm/mach-aspeed/include/mach/ast-uart-dma.h @@ -0,0 +1,86 @@ +/******************************************************************************** +* File Name : ast-uart-dma.h +* +* Copyright (C) 2012-2020 ASPEED Technology Inc. +* This program is free software; you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by the Free Software Foundation; +* either version 2 of the License, or (at your option) any later version. +* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; +* without even the implied warranty of MERCHANTABILITY or +* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. +* You should have received a copy of the GNU General Public License +* along with this program; if not, write to the Free Software +* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +********************************************************************************/ +#ifndef AST_UART_DMA_H_INCLUDED +#define AST_UART_DMA_H_INCLUDED + + +#define DMA_BUFF_SIZE 0x1000 //4096 + +struct ast_uart_dma_data { + u8 chip_no; //campain chip number + u8 dma_ch; //dma channel number +}; + + +/* enum ast_uart_chan_op + * + * operation codes passed to the DMA code by the user, and also used + * to inform the current channel owner of any changes to the system state +*/ + +enum ast_uart_chan_op { + AST_UART_DMAOP_TRIGGER, + AST_UART_DMAOP_STOP, +}; + +struct ast1070_dma_ch; + +/* ast_uart_dma_cbfn_t * * buffer callback routine type */ +typedef void (*ast_uart_dma_cbfn_t)(struct ast1070_dma_ch *,void *dev_id, u16 len); + +struct uart_dma_desc { + u32 desc0; + u32 desc1; + u32 desc2; + u32 desc3; +} __attribute__ ((aligned(16))); + +struct ast1070_dma_ch { + u8 ch_no; + u8 direction; + u8 enable; + u32 ctrl_offset; + u32 desc_offset; + void *priv; + struct uart_dma_desc *desc; + dma_addr_t desc_dma_addr; /* Mapped descr. table */ + /* cdriver callbacks */ + ast_uart_dma_cbfn_t callback_fn; /* buffer done callback */ +}; + +#define AST1070_UART_DMA_CH 4 + +struct ast1070_dma { + void __iomem *reg_base; + struct ast1070_dma_ch dma_tx_ch[AST1070_UART_DMA_CH]; + struct ast1070_dma_ch dma_rx_ch[AST1070_UART_DMA_CH]; +}; + + +/* ast_uart_dma_request * * request a dma channel exclusivley */ +extern int ast_uart_rx_dma_request(u8 node, u8 channel, ast_uart_dma_cbfn_t rtn, void *id); +extern int ast_uart_tx_dma_request(u8 node, u8 channel, ast_uart_dma_cbfn_t rtn, void *id); + +/* ast_uart_dma_ctrl * * change the state of the dma channel */ +extern int ast_uart_rx_dma_ctrl(u8 node, u8 ch, enum ast_uart_chan_op op); +extern int ast_uart_tx_dma_ctrl(u8 node, u8 ch, enum ast_uart_chan_op op); + +extern int ast_uart_rx_dma_enqueue(u8 node, u8 ch, dma_addr_t rx_buff, u16 len); +extern int ast_uart_tx_dma_enqueue(u8 node, u8 ch, dma_addr_t tx_buff, u16 len); + + + +#endif + |
