forked from Minki/linux
f79abb627f
The DMA_INTERRUPT async_tx is a NULL transfer, thus the BCR(count register) is 0. When the transfer started with a byte count of zero, the DMA controller will triger a PE(programming error) event and halt, not a normal interrupt. I add special codes for PE event and DMA_INTERRUPT async_tx testing. Signed-off-by: Zhang Wei <wei.zhang@freescale.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
191 lines
6.0 KiB
C
191 lines
6.0 KiB
C
/*
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* Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
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*
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* Author:
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* Zhang Wei <wei.zhang@freescale.com>, Jul 2007
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* Ebony Zhu <ebony.zhu@freescale.com>, May 2007
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#ifndef __DMA_FSLDMA_H
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#define __DMA_FSLDMA_H
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#include <linux/device.h>
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#include <linux/dmapool.h>
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#include <linux/dmaengine.h>
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/* Define data structures needed by Freescale
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* MPC8540 and MPC8349 DMA controller.
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*/
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#define FSL_DMA_MR_CS 0x00000001
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#define FSL_DMA_MR_CC 0x00000002
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#define FSL_DMA_MR_CA 0x00000008
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#define FSL_DMA_MR_EIE 0x00000040
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#define FSL_DMA_MR_XFE 0x00000020
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#define FSL_DMA_MR_EOLNIE 0x00000100
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#define FSL_DMA_MR_EOLSIE 0x00000080
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#define FSL_DMA_MR_EOSIE 0x00000200
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#define FSL_DMA_MR_CDSM 0x00000010
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#define FSL_DMA_MR_CTM 0x00000004
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#define FSL_DMA_MR_EMP_EN 0x00200000
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#define FSL_DMA_MR_EMS_EN 0x00040000
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#define FSL_DMA_MR_DAHE 0x00002000
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#define FSL_DMA_MR_SAHE 0x00001000
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/* Special MR definition for MPC8349 */
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#define FSL_DMA_MR_EOTIE 0x00000080
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#define FSL_DMA_SR_CH 0x00000020
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#define FSL_DMA_SR_PE 0x00000010
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#define FSL_DMA_SR_CB 0x00000004
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#define FSL_DMA_SR_TE 0x00000080
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#define FSL_DMA_SR_EOSI 0x00000002
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#define FSL_DMA_SR_EOLSI 0x00000001
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#define FSL_DMA_SR_EOCDI 0x00000001
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#define FSL_DMA_SR_EOLNI 0x00000008
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#define FSL_DMA_SATR_SBPATMU 0x20000000
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#define FSL_DMA_SATR_STRANSINT_RIO 0x00c00000
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#define FSL_DMA_SATR_SREADTYPE_SNOOP_READ 0x00050000
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#define FSL_DMA_SATR_SREADTYPE_BP_IORH 0x00020000
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#define FSL_DMA_SATR_SREADTYPE_BP_NREAD 0x00040000
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#define FSL_DMA_SATR_SREADTYPE_BP_MREAD 0x00070000
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#define FSL_DMA_DATR_DBPATMU 0x20000000
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#define FSL_DMA_DATR_DTRANSINT_RIO 0x00c00000
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#define FSL_DMA_DATR_DWRITETYPE_SNOOP_WRITE 0x00050000
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#define FSL_DMA_DATR_DWRITETYPE_BP_FLUSH 0x00010000
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#define FSL_DMA_EOL ((u64)0x1)
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#define FSL_DMA_SNEN ((u64)0x10)
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#define FSL_DMA_EOSIE 0x8
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#define FSL_DMA_NLDA_MASK (~(u64)0x1f)
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#define FSL_DMA_BCR_MAX_CNT 0x03ffffffu
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#define FSL_DMA_DGSR_TE 0x80
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#define FSL_DMA_DGSR_CH 0x20
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#define FSL_DMA_DGSR_PE 0x10
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#define FSL_DMA_DGSR_EOLNI 0x08
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#define FSL_DMA_DGSR_CB 0x04
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#define FSL_DMA_DGSR_EOSI 0x02
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#define FSL_DMA_DGSR_EOLSI 0x01
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struct fsl_dma_ld_hw {
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u64 __bitwise src_addr;
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u64 __bitwise dst_addr;
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u64 __bitwise next_ln_addr;
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u32 __bitwise count;
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u32 __bitwise reserve;
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} __attribute__((aligned(32)));
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struct fsl_desc_sw {
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struct fsl_dma_ld_hw hw;
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struct list_head node;
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struct dma_async_tx_descriptor async_tx;
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struct list_head *ld;
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void *priv;
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} __attribute__((aligned(32)));
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struct fsl_dma_chan_regs {
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u32 __bitwise mr; /* 0x00 - Mode Register */
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u32 __bitwise sr; /* 0x04 - Status Register */
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u64 __bitwise cdar; /* 0x08 - Current descriptor address register */
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u64 __bitwise sar; /* 0x10 - Source Address Register */
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u64 __bitwise dar; /* 0x18 - Destination Address Register */
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u32 __bitwise bcr; /* 0x20 - Byte Count Register */
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u64 __bitwise ndar; /* 0x24 - Next Descriptor Address Register */
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};
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struct fsl_dma_chan;
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#define FSL_DMA_MAX_CHANS_PER_DEVICE 4
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struct fsl_dma_device {
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void __iomem *reg_base; /* DGSR register base */
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struct resource reg; /* Resource for register */
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struct device *dev;
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struct dma_device common;
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struct fsl_dma_chan *chan[FSL_DMA_MAX_CHANS_PER_DEVICE];
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u32 feature; /* The same as DMA channels */
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};
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/* Define macros for fsl_dma_chan->feature property */
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#define FSL_DMA_LITTLE_ENDIAN 0x00000000
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#define FSL_DMA_BIG_ENDIAN 0x00000001
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#define FSL_DMA_IP_MASK 0x00000ff0
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#define FSL_DMA_IP_85XX 0x00000010
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#define FSL_DMA_IP_83XX 0x00000020
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#define FSL_DMA_CHAN_PAUSE_EXT 0x00001000
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#define FSL_DMA_CHAN_START_EXT 0x00002000
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struct fsl_dma_chan {
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struct fsl_dma_chan_regs __iomem *reg_base;
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dma_cookie_t completed_cookie; /* The maximum cookie completed */
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spinlock_t desc_lock; /* Descriptor operation lock */
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struct list_head ld_queue; /* Link descriptors queue */
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struct dma_chan common; /* DMA common channel */
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struct dma_pool *desc_pool; /* Descriptors pool */
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struct device *dev; /* Channel device */
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struct resource reg; /* Resource for register */
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int irq; /* Channel IRQ */
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int id; /* Raw id of this channel */
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struct tasklet_struct tasklet;
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u32 feature;
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void (*toggle_ext_pause)(struct fsl_dma_chan *fsl_chan, int size);
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void (*toggle_ext_start)(struct fsl_dma_chan *fsl_chan, int enable);
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void (*set_src_loop_size)(struct fsl_dma_chan *fsl_chan, int size);
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void (*set_dest_loop_size)(struct fsl_dma_chan *fsl_chan, int size);
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};
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#define to_fsl_chan(chan) container_of(chan, struct fsl_dma_chan, common)
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#define to_fsl_desc(lh) container_of(lh, struct fsl_desc_sw, node)
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#define tx_to_fsl_desc(tx) container_of(tx, struct fsl_desc_sw, async_tx)
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#ifndef __powerpc64__
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static u64 in_be64(const u64 __iomem *addr)
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{
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return ((u64)in_be32((u32 *)addr) << 32) | (in_be32((u32 *)addr + 1));
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}
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static void out_be64(u64 __iomem *addr, u64 val)
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{
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out_be32((u32 *)addr, val >> 32);
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out_be32((u32 *)addr + 1, (u32)val);
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}
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/* There is no asm instructions for 64 bits reverse loads and stores */
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static u64 in_le64(const u64 __iomem *addr)
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{
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return ((u64)in_le32((u32 *)addr + 1) << 32) | (in_le32((u32 *)addr));
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}
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static void out_le64(u64 __iomem *addr, u64 val)
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{
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out_le32((u32 *)addr + 1, val >> 32);
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out_le32((u32 *)addr, (u32)val);
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}
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#endif
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#define DMA_IN(fsl_chan, addr, width) \
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(((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ? \
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in_be##width(addr) : in_le##width(addr))
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#define DMA_OUT(fsl_chan, addr, val, width) \
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(((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ? \
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out_be##width(addr, val) : out_le##width(addr, val))
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#define DMA_TO_CPU(fsl_chan, d, width) \
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(((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ? \
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be##width##_to_cpu(d) : le##width##_to_cpu(d))
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#define CPU_TO_DMA(fsl_chan, c, width) \
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(((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ? \
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cpu_to_be##width(c) : cpu_to_le##width(c))
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#endif /* __DMA_FSLDMA_H */
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