diff options
Diffstat (limited to 'arch/arm/mach-s3c24xx/include/mach/dma.h')
| -rw-r--r-- | arch/arm/mach-s3c24xx/include/mach/dma.h | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c24xx/include/mach/dma.h b/arch/arm/mach-s3c24xx/include/mach/dma.h new file mode 100644 index 00000000000..acbdfecd418 --- /dev/null +++ b/arch/arm/mach-s3c24xx/include/mach/dma.h @@ -0,0 +1,210 @@ +/* arch/arm/mach-s3c2410/include/mach/dma.h + * + * Copyright (C) 2003-2006 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * + * Samsung S3C24XX DMA support + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +*/ + +#ifndef __ASM_ARCH_DMA_H +#define __ASM_ARCH_DMA_H __FILE__ + +#include <linux/device.h> + +#define MAX_DMA_TRANSFER_SIZE 0x100000 /* Data Unit is half word */ + +/* We use `virtual` dma channels to hide the fact we have only a limited + * number of DMA channels, and not of all of them (dependent on the device) + * can be attached to any DMA source. We therefore let the DMA core handle + * the allocation of hardware channels to clients. +*/ + +enum dma_ch { + DMACH_XD0, + DMACH_XD1, + DMACH_SDI, + DMACH_SPI0, + DMACH_SPI1, + DMACH_UART0, + DMACH_UART1, + DMACH_UART2, + DMACH_TIMER, + DMACH_I2S_IN, + DMACH_I2S_OUT, + DMACH_PCM_IN, + DMACH_PCM_OUT, + DMACH_MIC_IN, + DMACH_USB_EP1, + DMACH_USB_EP2, + DMACH_USB_EP3, + DMACH_USB_EP4, + DMACH_UART0_SRC2, /* s3c2412 second uart sources */ + DMACH_UART1_SRC2, + DMACH_UART2_SRC2, + DMACH_UART3, /* s3c2443 has extra uart */ + DMACH_UART3_SRC2, + DMACH_MAX, /* the end entry */ +}; + +static inline bool samsung_dma_has_circular(void) +{ + return false; +} + +static inline bool samsung_dma_is_dmadev(void) +{ + return false; +} + +#include <plat/dma.h> + +#define DMACH_LOW_LEVEL (1<<28) /* use this to specifiy hardware ch no */ + +/* we have 4 dma channels */ +#if !defined(CONFIG_CPU_S3C2443) && !defined(CONFIG_CPU_S3C2416) +#define S3C_DMA_CHANNELS (4) +#else +#define S3C_DMA_CHANNELS (6) +#endif + +/* types */ + +enum s3c2410_dma_state { + S3C2410_DMA_IDLE, + S3C2410_DMA_RUNNING, + S3C2410_DMA_PAUSED +}; + +/* enum s3c2410_dma_loadst + * + * This represents the state of the DMA engine, wrt to the loaded / running + * transfers. Since we don't have any way of knowing exactly the state of + * the DMA transfers, we need to know the state to make decisions on wether + * we can + * + * S3C2410_DMA_NONE + * + * There are no buffers loaded (the channel should be inactive) + * + * S3C2410_DMA_1LOADED + * + * There is one buffer loaded, however it has not been confirmed to be + * loaded by the DMA engine. This may be because the channel is not + * yet running, or the DMA driver decided that it was too costly to + * sit and wait for it to happen. + * + * S3C2410_DMA_1RUNNING + * + * The buffer has been confirmed running, and not finisged + * + * S3C2410_DMA_1LOADED_1RUNNING + * + * There is a buffer waiting to be loaded by the DMA engine, and one + * currently running. +*/ + +enum s3c2410_dma_loadst { + S3C2410_DMALOAD_NONE, + S3C2410_DMALOAD_1LOADED, + S3C2410_DMALOAD_1RUNNING, + S3C2410_DMALOAD_1LOADED_1RUNNING, +}; + + +/* flags */ + +#define S3C2410_DMAF_SLOW (1<<0) /* slow, so don't worry about + * waiting for reloads */ +#define S3C2410_DMAF_AUTOSTART (1<<1) /* auto-start if buffer queued */ + +#define S3C2410_DMAF_CIRCULAR (1 << 2) /* no circular dma support */ + +/* dma buffer */ + +struct s3c2410_dma_buf; + +/* s3c2410_dma_buf + * + * internally used buffer structure to describe a queued or running + * buffer. +*/ + +struct s3c2410_dma_buf { + struct s3c2410_dma_buf *next; + int magic; /* magic */ + int size; /* buffer size in bytes */ + dma_addr_t data; /* start of DMA data */ + dma_addr_t ptr; /* where the DMA got to [1] */ + void *id; /* client's id */ +}; + +/* [1] is this updated for both recv/send modes? */ + +struct s3c2410_dma_stats { + unsigned long loads; + unsigned long timeout_longest; + unsigned long timeout_shortest; + unsigned long timeout_avg; + unsigned long timeout_failed; +}; + +struct s3c2410_dma_map; + +/* struct s3c2410_dma_chan + * + * full state information for each DMA channel +*/ + +struct s3c2410_dma_chan { + /* channel state flags and information */ + unsigned char number; /* number of this dma channel */ + unsigned char in_use; /* channel allocated */ + unsigned char irq_claimed; /* irq claimed for channel */ + unsigned char irq_enabled; /* irq enabled for channel */ + unsigned char xfer_unit; /* size of an transfer */ + + /* channel state */ + + enum s3c2410_dma_state state; + enum s3c2410_dma_loadst load_state; + struct s3c2410_dma_client *client; + + /* channel configuration */ + enum dma_data_direction source; + enum dma_ch req_ch; + unsigned long dev_addr; + unsigned long load_timeout; + unsigned int flags; /* channel flags */ + + struct s3c24xx_dma_map *map; /* channel hw maps */ + + /* channel's hardware position and configuration */ + void __iomem *regs; /* channels registers */ + void __iomem *addr_reg; /* data address register */ + unsigned int irq; /* channel irq */ + unsigned long dcon; /* default value of DCON */ + + /* driver handles */ + s3c2410_dma_cbfn_t callback_fn; /* buffer done callback */ + s3c2410_dma_opfn_t op_fn; /* channel op callback */ + + /* stats gathering */ + struct s3c2410_dma_stats *stats; + struct s3c2410_dma_stats stats_store; + + /* buffer list and information */ + struct s3c2410_dma_buf *curr; /* current dma buffer */ + struct s3c2410_dma_buf *next; /* next buffer to load */ + struct s3c2410_dma_buf *end; /* end of queue */ + + /* system device */ + struct device dev; +}; + +typedef unsigned long dma_device_t; + +#endif /* __ASM_ARCH_DMA_H */ |