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linux/drivers/dma/at_hdmac_regs.h
Nicolas Ferre 808347f6a3 dmaengine: at_hdmac: add DMA slave transfers 
This patch for at_hdmac adds the slave transfers capability to the Atmel DMA
controller available on some AT91 SOCs. This allow peripheral to memory and
memory to peripheral transfers with hardware handshaking.

Slave structure for controller specific information is passed through channel
private data. This at_dma_slave structure is defined in at_hdmac.h header file
and relative hardware definition are moved to this file from at_hdmac_regs.h.
Doing this we allow the channel configuration from platform definition code.

This work is intensively based on dw_dmac and several slave implementations.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-07-22 23:15:33 -07:00

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/*
* Header file for the Atmel AHB DMA Controller driver
*
* Copyright (C) 2008 Atmel Corporation
*
* 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.
*/
#ifndef AT_HDMAC_REGS_H
#define AT_HDMAC_REGS_H
#include <mach/at_hdmac.h>
#define AT_DMA_MAX_NR_CHANNELS 8
#define AT_DMA_GCFG 0x00 /* Global Configuration Register */
#define AT_DMA_IF_BIGEND(i) (0x1 << (i)) /* AHB-Lite Interface i in Big-endian mode */
#define AT_DMA_ARB_CFG (0x1 << 4) /* Arbiter mode. */
#define AT_DMA_ARB_CFG_FIXED (0x0 << 4)
#define AT_DMA_ARB_CFG_ROUND_ROBIN (0x1 << 4)
#define AT_DMA_EN 0x04 /* Controller Enable Register */
#define AT_DMA_ENABLE (0x1 << 0)
#define AT_DMA_SREQ 0x08 /* Software Single Request Register */
#define AT_DMA_SSREQ(x) (0x1 << ((x) << 1)) /* Request a source single transfer on channel x */
#define AT_DMA_DSREQ(x) (0x1 << (1 + ((x) << 1))) /* Request a destination single transfer on channel x */
#define AT_DMA_CREQ 0x0C /* Software Chunk Transfer Request Register */
#define AT_DMA_SCREQ(x) (0x1 << ((x) << 1)) /* Request a source chunk transfer on channel x */
#define AT_DMA_DCREQ(x) (0x1 << (1 + ((x) << 1))) /* Request a destination chunk transfer on channel x */
#define AT_DMA_LAST 0x10 /* Software Last Transfer Flag Register */
#define AT_DMA_SLAST(x) (0x1 << ((x) << 1)) /* This src rq is last tx of buffer on channel x */
#define AT_DMA_DLAST(x) (0x1 << (1 + ((x) << 1))) /* This dst rq is last tx of buffer on channel x */
#define AT_DMA_SYNC 0x14 /* Request Synchronization Register */
#define AT_DMA_SYR(h) (0x1 << (h)) /* Synchronize handshake line h */
/* Error, Chained Buffer transfer completed and Buffer transfer completed Interrupt registers */
#define AT_DMA_EBCIER 0x18 /* Enable register */
#define AT_DMA_EBCIDR 0x1C /* Disable register */
#define AT_DMA_EBCIMR 0x20 /* Mask Register */
#define AT_DMA_EBCISR 0x24 /* Status Register */
#define AT_DMA_CBTC_OFFSET 8
#define AT_DMA_ERR_OFFSET 16
#define AT_DMA_BTC(x) (0x1 << (x))
#define AT_DMA_CBTC(x) (0x1 << (AT_DMA_CBTC_OFFSET + (x)))
#define AT_DMA_ERR(x) (0x1 << (AT_DMA_ERR_OFFSET + (x)))
#define AT_DMA_CHER 0x28 /* Channel Handler Enable Register */
#define AT_DMA_ENA(x) (0x1 << (x))
#define AT_DMA_SUSP(x) (0x1 << ( 8 + (x)))
#define AT_DMA_KEEP(x) (0x1 << (24 + (x)))
#define AT_DMA_CHDR 0x2C /* Channel Handler Disable Register */
#define AT_DMA_DIS(x) (0x1 << (x))
#define AT_DMA_RES(x) (0x1 << ( 8 + (x)))
#define AT_DMA_CHSR 0x30 /* Channel Handler Status Register */
#define AT_DMA_EMPT(x) (0x1 << (16 + (x)))
#define AT_DMA_STAL(x) (0x1 << (24 + (x)))
#define AT_DMA_CH_REGS_BASE 0x3C /* Channel registers base address */
#define ch_regs(x) (AT_DMA_CH_REGS_BASE + (x) * 0x28) /* Channel x base addr */
/* Hardware register offset for each channel */
#define ATC_SADDR_OFFSET 0x00 /* Source Address Register */
#define ATC_DADDR_OFFSET 0x04 /* Destination Address Register */
#define ATC_DSCR_OFFSET 0x08 /* Descriptor Address Register */
#define ATC_CTRLA_OFFSET 0x0C /* Control A Register */
#define ATC_CTRLB_OFFSET 0x10 /* Control B Register */
#define ATC_CFG_OFFSET 0x14 /* Configuration Register */
#define ATC_SPIP_OFFSET 0x18 /* Src PIP Configuration Register */
#define ATC_DPIP_OFFSET 0x1C /* Dst PIP Configuration Register */
/* Bitfield definitions */
/* Bitfields in DSCR */
#define ATC_DSCR_IF(i) (0x3 & (i)) /* Dsc feched via AHB-Lite Interface i */
/* Bitfields in CTRLA */
#define ATC_BTSIZE_MAX 0xFFFFUL /* Maximum Buffer Transfer Size */
#define ATC_BTSIZE(x) (ATC_BTSIZE_MAX & (x)) /* Buffer Transfer Size */
/* Chunck Tranfer size definitions are in at_hdmac.h */
#define ATC_SRC_WIDTH_MASK (0x3 << 24) /* Source Single Transfer Size */
#define ATC_SRC_WIDTH(x) ((x) << 24)
#define ATC_SRC_WIDTH_BYTE (0x0 << 24)
#define ATC_SRC_WIDTH_HALFWORD (0x1 << 24)
#define ATC_SRC_WIDTH_WORD (0x2 << 24)
#define ATC_DST_WIDTH_MASK (0x3 << 28) /* Destination Single Transfer Size */
#define ATC_DST_WIDTH(x) ((x) << 28)
#define ATC_DST_WIDTH_BYTE (0x0 << 28)
#define ATC_DST_WIDTH_HALFWORD (0x1 << 28)
#define ATC_DST_WIDTH_WORD (0x2 << 28)
#define ATC_DONE (0x1 << 31) /* Tx Done (only written back in descriptor) */
/* Bitfields in CTRLB */
#define ATC_SIF(i) (0x3 & (i)) /* Src tx done via AHB-Lite Interface i */
#define ATC_DIF(i) ((0x3 & (i)) << 4) /* Dst tx done via AHB-Lite Interface i */
#define ATC_SRC_PIP (0x1 << 8) /* Source Picture-in-Picture enabled */
#define ATC_DST_PIP (0x1 << 12) /* Destination Picture-in-Picture enabled */
#define ATC_SRC_DSCR_DIS (0x1 << 16) /* Src Descriptor fetch disable */
#define ATC_DST_DSCR_DIS (0x1 << 20) /* Dst Descriptor fetch disable */
#define ATC_FC_MASK (0x7 << 21) /* Choose Flow Controller */
#define ATC_FC_MEM2MEM (0x0 << 21) /* Mem-to-Mem (DMA) */
#define ATC_FC_MEM2PER (0x1 << 21) /* Mem-to-Periph (DMA) */
#define ATC_FC_PER2MEM (0x2 << 21) /* Periph-to-Mem (DMA) */
#define ATC_FC_PER2PER (0x3 << 21) /* Periph-to-Periph (DMA) */
#define ATC_FC_PER2MEM_PER (0x4 << 21) /* Periph-to-Mem (Peripheral) */
#define ATC_FC_MEM2PER_PER (0x5 << 21) /* Mem-to-Periph (Peripheral) */
#define ATC_FC_PER2PER_SRCPER (0x6 << 21) /* Periph-to-Periph (Src Peripheral) */
#define ATC_FC_PER2PER_DSTPER (0x7 << 21) /* Periph-to-Periph (Dst Peripheral) */
#define ATC_SRC_ADDR_MODE_MASK (0x3 << 24)
#define ATC_SRC_ADDR_MODE_INCR (0x0 << 24) /* Incrementing Mode */
#define ATC_SRC_ADDR_MODE_DECR (0x1 << 24) /* Decrementing Mode */
#define ATC_SRC_ADDR_MODE_FIXED (0x2 << 24) /* Fixed Mode */
#define ATC_DST_ADDR_MODE_MASK (0x3 << 28)
#define ATC_DST_ADDR_MODE_INCR (0x0 << 28) /* Incrementing Mode */
#define ATC_DST_ADDR_MODE_DECR (0x1 << 28) /* Decrementing Mode */
#define ATC_DST_ADDR_MODE_FIXED (0x2 << 28) /* Fixed Mode */
#define ATC_IEN (0x1 << 30) /* BTC interrupt enable (active low) */
#define ATC_AUTO (0x1 << 31) /* Auto multiple buffer tx enable */
/* Bitfields in CFG */
/* are in at_hdmac.h */
/* Bitfields in SPIP */
#define ATC_SPIP_HOLE(x) (0xFFFFU & (x))
#define ATC_SPIP_BOUNDARY(x) ((0x3FF & (x)) << 16)
/* Bitfields in DPIP */
#define ATC_DPIP_HOLE(x) (0xFFFFU & (x))
#define ATC_DPIP_BOUNDARY(x) ((0x3FF & (x)) << 16)
/*-- descriptors -----------------------------------------------------*/
/* LLI == Linked List Item; aka DMA buffer descriptor */
struct at_lli {
/* values that are not changed by hardware */
dma_addr_t saddr;
dma_addr_t daddr;
/* value that may get written back: */
u32 ctrla;
/* more values that are not changed by hardware */
u32 ctrlb;
dma_addr_t dscr; /* chain to next lli */
};
/**
* struct at_desc - software descriptor
* @at_lli: hardware lli structure
* @txd: support for the async_tx api
* @desc_node: node on the channed descriptors list
* @len: total transaction bytecount
*/
struct at_desc {
/* FIRST values the hardware uses */
struct at_lli lli;
/* THEN values for driver housekeeping */
struct dma_async_tx_descriptor txd;
struct list_head desc_node;
size_t len;
};
static inline struct at_desc *
txd_to_at_desc(struct dma_async_tx_descriptor *txd)
{
return container_of(txd, struct at_desc, txd);
}
/*-- Channels --------------------------------------------------------*/
/**
* struct at_dma_chan - internal representation of an Atmel HDMAC channel
* @chan_common: common dmaengine channel object members
* @device: parent device
* @ch_regs: memory mapped register base
* @mask: channel index in a mask
* @error_status: transmit error status information from irq handler
* to tasklet (use atomic operations)
* @tasklet: bottom half to finish transaction work
* @lock: serializes enqueue/dequeue operations to descriptors lists
* @completed_cookie: identifier for the most recently completed operation
* @active_list: list of descriptors dmaengine is being running on
* @queue: list of descriptors ready to be submitted to engine
* @free_list: list of descriptors usable by the channel
* @descs_allocated: records the actual size of the descriptor pool
*/
struct at_dma_chan {
struct dma_chan chan_common;
struct at_dma *device;
void __iomem *ch_regs;
u8 mask;
unsigned long error_status;
struct tasklet_struct tasklet;
spinlock_t lock;
/* these other elements are all protected by lock */
dma_cookie_t completed_cookie;
struct list_head active_list;
struct list_head queue;
struct list_head free_list;
unsigned int descs_allocated;
};
#define channel_readl(atchan, name) \
__raw_readl((atchan)->ch_regs + ATC_##name##_OFFSET)
#define channel_writel(atchan, name, val) \
__raw_writel((val), (atchan)->ch_regs + ATC_##name##_OFFSET)
static inline struct at_dma_chan *to_at_dma_chan(struct dma_chan *dchan)
{
return container_of(dchan, struct at_dma_chan, chan_common);
}
/*-- Controller ------------------------------------------------------*/
/**
* struct at_dma - internal representation of an Atmel HDMA Controller
* @chan_common: common dmaengine dma_device object members
* @ch_regs: memory mapped register base
* @clk: dma controller clock
* @all_chan_mask: all channels availlable in a mask
* @dma_desc_pool: base of DMA descriptor region (DMA address)
* @chan: channels table to store at_dma_chan structures
*/
struct at_dma {
struct dma_device dma_common;
void __iomem *regs;
struct clk *clk;
u8 all_chan_mask;
struct dma_pool *dma_desc_pool;
/* AT THE END channels table */
struct at_dma_chan chan[0];
};
#define dma_readl(atdma, name) \
__raw_readl((atdma)->regs + AT_DMA_##name)
#define dma_writel(atdma, name, val) \
__raw_writel((val), (atdma)->regs + AT_DMA_##name)
static inline struct at_dma *to_at_dma(struct dma_device *ddev)
{
return container_of(ddev, struct at_dma, dma_common);
}
/*-- Helper functions ------------------------------------------------*/
static struct device *chan2dev(struct dma_chan *chan)
{
return &chan->dev->device;
}
static struct device *chan2parent(struct dma_chan *chan)
{
return chan->dev->device.parent;
}
#if defined(VERBOSE_DEBUG)
static void vdbg_dump_regs(struct at_dma_chan *atchan)
{
struct at_dma *atdma = to_at_dma(atchan->chan_common.device);
dev_err(chan2dev(&atchan->chan_common),
" channel %d : imr = 0x%x, chsr = 0x%x\n",
atchan->chan_common.chan_id,
dma_readl(atdma, EBCIMR),
dma_readl(atdma, CHSR));
dev_err(chan2dev(&atchan->chan_common),
" channel: s0x%x d0x%x ctrl0x%x:0x%x cfg0x%x l0x%x\n",
channel_readl(atchan, SADDR),
channel_readl(atchan, DADDR),
channel_readl(atchan, CTRLA),
channel_readl(atchan, CTRLB),
channel_readl(atchan, CFG),
channel_readl(atchan, DSCR));
}
#else
static void vdbg_dump_regs(struct at_dma_chan *atchan) {}
#endif
static void atc_dump_lli(struct at_dma_chan *atchan, struct at_lli *lli)
{
dev_printk(KERN_CRIT, chan2dev(&atchan->chan_common),
" desc: s0x%x d0x%x ctrl0x%x:0x%x l0x%x\n",
lli->saddr, lli->daddr,
lli->ctrla, lli->ctrlb, lli->dscr);
}
static void atc_setup_irq(struct at_dma_chan *atchan, int on)
{
struct at_dma *atdma = to_at_dma(atchan->chan_common.device);
u32 ebci;
/* enable interrupts on buffer chain completion & error */
ebci = AT_DMA_CBTC(atchan->chan_common.chan_id)
| AT_DMA_ERR(atchan->chan_common.chan_id);
if (on)
dma_writel(atdma, EBCIER, ebci);
else
dma_writel(atdma, EBCIDR, ebci);
}
static inline void atc_enable_irq(struct at_dma_chan *atchan)
{
atc_setup_irq(atchan, 1);
}
static inline void atc_disable_irq(struct at_dma_chan *atchan)
{
atc_setup_irq(atchan, 0);
}
/**
* atc_chan_is_enabled - test if given channel is enabled
* @atchan: channel we want to test status
*/
static inline int atc_chan_is_enabled(struct at_dma_chan *atchan)
{
struct at_dma *atdma = to_at_dma(atchan->chan_common.device);
return !!(dma_readl(atdma, CHSR) & atchan->mask);
}
/**
* set_desc_eol - set end-of-link to descriptor so it will end transfer
* @desc: descriptor, signle or at the end of a chain, to end chain on
*/
static void set_desc_eol(struct at_desc *desc)
{
desc->lli.ctrlb |= ATC_SRC_DSCR_DIS | ATC_DST_DSCR_DIS;
desc->lli.dscr = 0;
}
#endif /* AT_HDMAC_REGS_H */
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