diff options
Diffstat (limited to 'arch/arm/plat-samsung')
| -rw-r--r-- | arch/arm/plat-samsung/Makefile | 4 | ||||
| -rw-r--r-- | arch/arm/plat-samsung/dma.c | 84 | ||||
| -rw-r--r-- | arch/arm/plat-samsung/include/plat/dma.h | 127 |
3 files changed, 215 insertions, 0 deletions
diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile index 629fd9f..facc7e3 100644 --- a/arch/arm/plat-samsung/Makefile +++ b/arch/arm/plat-samsung/Makefile @@ -39,6 +39,10 @@ obj-$(CONFIG_S3C_DEV_USB_HOST) += dev-usb.o obj-$(CONFIG_S3C_DEV_USB_HSOTG) += dev-usb-hsotg.o obj-$(CONFIG_S3C_DEV_NAND) += dev-nand.o +# DMA support + +obj-$(CONFIG_S3C_DMA) += dma.o + # PM support obj-$(CONFIG_PM) += pm.o diff --git a/arch/arm/plat-samsung/dma.c b/arch/arm/plat-samsung/dma.c new file mode 100644 index 0000000..606db1a --- /dev/null +++ b/arch/arm/plat-samsung/dma.c @@ -0,0 +1,84 @@ +/* linux/arch/arm/plat-s3c/dma.c + * + * Copyright (c) 2003-2009 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * http://armlinux.simtec.co.uk/ + * + * S3C DMA core + * + * 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. +*/ + +struct s3c2410_dma_buf; + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/errno.h> + +#include <mach/dma.h> +#include <mach/irqs.h> + +/* dma channel state information */ +struct s3c2410_dma_chan s3c2410_chans[S3C_DMA_CHANNELS]; +struct s3c2410_dma_chan *s3c_dma_chan_map[DMACH_MAX]; + +/* s3c_dma_lookup_channel + * + * change the dma channel number given into a real dma channel id +*/ + +struct s3c2410_dma_chan *s3c_dma_lookup_channel(unsigned int channel) +{ + if (channel & DMACH_LOW_LEVEL) + return &s3c2410_chans[channel & ~DMACH_LOW_LEVEL]; + else + return s3c_dma_chan_map[channel]; +} + +/* do we need to protect the settings of the fields from + * irq? +*/ + +int s3c2410_dma_set_opfn(unsigned int channel, s3c2410_dma_opfn_t rtn) +{ + struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); + + if (chan == NULL) + return -EINVAL; + + pr_debug("%s: chan=%p, op rtn=%p\n", __func__, chan, rtn); + + chan->op_fn = rtn; + + return 0; +} +EXPORT_SYMBOL(s3c2410_dma_set_opfn); + +int s3c2410_dma_set_buffdone_fn(unsigned int channel, s3c2410_dma_cbfn_t rtn) +{ + struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); + + if (chan == NULL) + return -EINVAL; + + pr_debug("%s: chan=%p, callback rtn=%p\n", __func__, chan, rtn); + + chan->callback_fn = rtn; + + return 0; +} +EXPORT_SYMBOL(s3c2410_dma_set_buffdone_fn); + +int s3c2410_dma_setflags(unsigned int channel, unsigned int flags) +{ + struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); + + if (chan == NULL) + return -EINVAL; + + chan->flags = flags; + return 0; +} +EXPORT_SYMBOL(s3c2410_dma_setflags); diff --git a/arch/arm/plat-samsung/include/plat/dma.h b/arch/arm/plat-samsung/include/plat/dma.h new file mode 100644 index 0000000..7584d75 --- /dev/null +++ b/arch/arm/plat-samsung/include/plat/dma.h @@ -0,0 +1,127 @@ +/* arch/arm/plat-samsung/include/plat/dma.h + * + * Copyright (C) 2003-2006 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * + * Samsung S3C 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. +*/ + +enum s3c2410_dma_buffresult { + S3C2410_RES_OK, + S3C2410_RES_ERR, + S3C2410_RES_ABORT +}; + +enum s3c2410_dmasrc { + S3C2410_DMASRC_HW, /* source is memory */ + S3C2410_DMASRC_MEM /* source is hardware */ +}; + +/* enum s3c2410_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 s3c2410_chan_op { + S3C2410_DMAOP_START, + S3C2410_DMAOP_STOP, + S3C2410_DMAOP_PAUSE, + S3C2410_DMAOP_RESUME, + S3C2410_DMAOP_FLUSH, + S3C2410_DMAOP_TIMEOUT, /* internal signal to handler */ + S3C2410_DMAOP_STARTED, /* indicate channel started */ +}; + +struct s3c2410_dma_client { + char *name; +}; + +struct s3c2410_dma_chan; + +/* s3c2410_dma_cbfn_t + * + * buffer callback routine type +*/ + +typedef void (*s3c2410_dma_cbfn_t)(struct s3c2410_dma_chan *, + void *buf, int size, + enum s3c2410_dma_buffresult result); + +typedef int (*s3c2410_dma_opfn_t)(struct s3c2410_dma_chan *, + enum s3c2410_chan_op ); + + + +/* s3c2410_dma_request + * + * request a dma channel exclusivley +*/ + +extern int s3c2410_dma_request(unsigned int channel, + struct s3c2410_dma_client *, void *dev); + + +/* s3c2410_dma_ctrl + * + * change the state of the dma channel +*/ + +extern int s3c2410_dma_ctrl(unsigned int channel, enum s3c2410_chan_op op); + +/* s3c2410_dma_setflags + * + * set the channel's flags to a given state +*/ + +extern int s3c2410_dma_setflags(unsigned int channel, + unsigned int flags); + +/* s3c2410_dma_free + * + * free the dma channel (will also abort any outstanding operations) +*/ + +extern int s3c2410_dma_free(unsigned int channel, struct s3c2410_dma_client *); + +/* s3c2410_dma_enqueue + * + * place the given buffer onto the queue of operations for the channel. + * The buffer must be allocated from dma coherent memory, or the Dcache/WB + * drained before the buffer is given to the DMA system. +*/ + +extern int s3c2410_dma_enqueue(unsigned int channel, void *id, + dma_addr_t data, int size); + +/* s3c2410_dma_config + * + * configure the dma channel +*/ + +extern int s3c2410_dma_config(unsigned int channel, int xferunit); + +/* s3c2410_dma_devconfig + * + * configure the device we're talking to +*/ + +extern int s3c2410_dma_devconfig(int channel, enum s3c2410_dmasrc source, + unsigned long devaddr); + +/* s3c2410_dma_getposition + * + * get the position that the dma transfer is currently at +*/ + +extern int s3c2410_dma_getposition(unsigned int channel, + dma_addr_t *src, dma_addr_t *dest); + +extern int s3c2410_dma_set_opfn(unsigned int, s3c2410_dma_opfn_t rtn); +extern int s3c2410_dma_set_buffdone_fn(unsigned int, s3c2410_dma_cbfn_t rtn); + + |