#ifndef __ASM_ARM_DMA_H #define __ASM_ARM_DMA_H typedef unsigned int dmach_t; #include <linux/config.h> #include <linux/spinlock.h> #include <asm/system.h> #include <asm/memory.h> #include <asm/scatterlist.h> // FIXME - do we really need this? arm26 cant do 'proper' DMA typedef struct dma_struct dma_t; typedef unsigned int dmamode_t; struct dma_ops { int (*request)(dmach_t, dma_t *); /* optional */ void (*free)(dmach_t, dma_t *); /* optional */ void (*enable)(dmach_t, dma_t *); /* mandatory */ void (*disable)(dmach_t, dma_t *); /* mandatory */ int (*residue)(dmach_t, dma_t *); /* optional */ int (*setspeed)(dmach_t, dma_t *, int); /* optional */ char *type; }; struct dma_struct { struct scatterlist buf; /* single DMA */ int sgcount; /* number of DMA SG */ struct scatterlist *sg; /* DMA Scatter-Gather List */ unsigned int active:1; /* Transfer active */ unsigned int invalid:1; /* Address/Count changed */ unsigned int using_sg:1; /* using scatter list? */ dmamode_t dma_mode; /* DMA mode */ int speed; /* DMA speed */ unsigned int lock; /* Device is allocated */ const char *device_id; /* Device name */ unsigned int dma_base; /* Controller base address */ int dma_irq; /* Controller IRQ */ int state; /* Controller state */ struct scatterlist cur_sg; /* Current controller buffer */ struct dma_ops *d_ops; }; /* Prototype: void arch_dma_init(dma) * Purpose : Initialise architecture specific DMA * Params : dma - pointer to array of DMA structures */ extern void arch_dma_init(dma_t *dma); extern void isa_init_dma(dma_t *dma); #define MAX_DMA_ADDRESS 0x03000000 #define MAX_DMA_CHANNELS 3 /* ARC */ #define DMA_VIRTUAL_FLOPPY0 0 #define DMA_VIRTUAL_FLOPPY1 1 #define DMA_VIRTUAL_SOUND 2 /* A5K */ #define DMA_FLOPPY 0 /* * DMA modes */ #define DMA_MODE_MASK 3 #define DMA_MODE_READ 0 #define DMA_MODE_WRITE 1 #define DMA_MODE_CASCADE 2 #define DMA_AUTOINIT 4 extern spinlock_t dma_spin_lock; static inline unsigned long claim_dma_lock(void) { unsigned long flags; spin_lock_irqsave(&dma_spin_lock, flags); return flags; } static inline void release_dma_lock(unsigned long flags) { spin_unlock_irqrestore(&dma_spin_lock, flags); } /* Clear the 'DMA Pointer Flip Flop'. * Write 0 for LSB/MSB, 1 for MSB/LSB access. */ #define clear_dma_ff(channel) /* Set only the page register bits of the transfer address. * * NOTE: This is an architecture specific function, and should * be hidden from the drivers */ extern void set_dma_page(dmach_t channel, char pagenr); /* Request a DMA channel * * Some architectures may need to do allocate an interrupt */ extern int request_dma(dmach_t channel, const char * device_id); /* Free a DMA channel * * Some architectures may need to do free an interrupt */ extern void free_dma(dmach_t channel); /* Enable DMA for this channel * * On some architectures, this may have other side effects like * enabling an interrupt and setting the DMA registers. */ extern void enable_dma(dmach_t channel); /* Disable DMA for this channel * * On some architectures, this may have other side effects like * disabling an interrupt or whatever. */ extern void disable_dma(dmach_t channel); /* Test whether the specified channel has an active DMA transfer */ extern int dma_channel_active(dmach_t channel); /* Set the DMA scatter gather list for this channel * * This should not be called if a DMA channel is enabled, * especially since some DMA architectures don't update the * DMA address immediately, but defer it to the enable_dma(). */ extern void set_dma_sg(dmach_t channel, struct scatterlist *sg, int nr_sg); /* Set the DMA address for this channel * * This should not be called if a DMA channel is enabled, * especially since some DMA architectures don't update the * DMA address immediately, but defer it to the enable_dma(). */ extern void set_dma_addr(dmach_t channel, unsigned long physaddr); /* Set the DMA byte count for this channel * * This should not be called if a DMA channel is enabled, * especially since some DMA architectures don't update the * DMA count immediately, but defer it to the enable_dma(). */ extern void set_dma_count(dmach_t channel, unsigned long count); /* Set the transfer direction for this channel * * This should not be called if a DMA channel is enabled, * especially since some DMA architectures don't update the * DMA transfer direction immediately, but defer it to the * enable_dma(). */ extern void set_dma_mode(dmach_t channel, dmamode_t mode); /* Set the transfer speed for this channel */ extern void set_dma_speed(dmach_t channel, int cycle_ns); /* Get DMA residue count. After a DMA transfer, this * should return zero. Reading this while a DMA transfer is * still in progress will return unpredictable results. * If called before the channel has been used, it may return 1. * Otherwise, it returns the number of _bytes_ left to transfer. */ extern int get_dma_residue(dmach_t channel); #ifndef NO_DMA #define NO_DMA 255 #endif #endif /* _ARM_DMA_H */