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/********************************************************************************
* 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
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