![Russell King - ARM Linux](/assets/img/avatar_default.png)
Everyone deals with assigning DMA cookies in the same way (it's part of the API so they should be), so lets consolidate the common code into a helper function to avoid this duplication. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Tested-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Jassi Brar <jassisinghbrar@gmail.com> [imx-sdma.c & mxs-dma.c] Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
1475 lines
37 KiB
C
1475 lines
37 KiB
C
/*
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* Freescale MPC85xx, MPC83xx DMA Engine support
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*
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* Copyright (C) 2007-2010 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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* Description:
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* DMA engine driver for Freescale MPC8540 DMA controller, which is
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* also fit for MPC8560, MPC8555, MPC8548, MPC8641, and etc.
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* The support for MPC8349 DMA controller is also added.
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*
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* This driver instructs the DMA controller to issue the PCI Read Multiple
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* command for PCI read operations, instead of using the default PCI Read Line
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* command. Please be aware that this setting may result in read pre-fetching
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* on some platforms.
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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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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/dmaengine.h>
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#include <linux/delay.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmapool.h>
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#include <linux/of_platform.h>
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#include "dmaengine.h"
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#include "fsldma.h"
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#define chan_dbg(chan, fmt, arg...) \
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dev_dbg(chan->dev, "%s: " fmt, chan->name, ##arg)
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#define chan_err(chan, fmt, arg...) \
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dev_err(chan->dev, "%s: " fmt, chan->name, ##arg)
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static const char msg_ld_oom[] = "No free memory for link descriptor";
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/*
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* Register Helpers
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*/
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static void set_sr(struct fsldma_chan *chan, u32 val)
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{
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DMA_OUT(chan, &chan->regs->sr, val, 32);
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}
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static u32 get_sr(struct fsldma_chan *chan)
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{
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return DMA_IN(chan, &chan->regs->sr, 32);
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}
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static void set_cdar(struct fsldma_chan *chan, dma_addr_t addr)
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{
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DMA_OUT(chan, &chan->regs->cdar, addr | FSL_DMA_SNEN, 64);
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}
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static dma_addr_t get_cdar(struct fsldma_chan *chan)
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{
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return DMA_IN(chan, &chan->regs->cdar, 64) & ~FSL_DMA_SNEN;
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}
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static u32 get_bcr(struct fsldma_chan *chan)
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{
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return DMA_IN(chan, &chan->regs->bcr, 32);
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}
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/*
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* Descriptor Helpers
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*/
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static void set_desc_cnt(struct fsldma_chan *chan,
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struct fsl_dma_ld_hw *hw, u32 count)
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{
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hw->count = CPU_TO_DMA(chan, count, 32);
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}
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static u32 get_desc_cnt(struct fsldma_chan *chan, struct fsl_desc_sw *desc)
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{
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return DMA_TO_CPU(chan, desc->hw.count, 32);
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}
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static void set_desc_src(struct fsldma_chan *chan,
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struct fsl_dma_ld_hw *hw, dma_addr_t src)
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{
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u64 snoop_bits;
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snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX)
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? ((u64)FSL_DMA_SATR_SREADTYPE_SNOOP_READ << 32) : 0;
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hw->src_addr = CPU_TO_DMA(chan, snoop_bits | src, 64);
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}
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static dma_addr_t get_desc_src(struct fsldma_chan *chan,
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struct fsl_desc_sw *desc)
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{
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u64 snoop_bits;
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snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX)
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? ((u64)FSL_DMA_SATR_SREADTYPE_SNOOP_READ << 32) : 0;
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return DMA_TO_CPU(chan, desc->hw.src_addr, 64) & ~snoop_bits;
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}
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static void set_desc_dst(struct fsldma_chan *chan,
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struct fsl_dma_ld_hw *hw, dma_addr_t dst)
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{
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u64 snoop_bits;
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snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX)
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? ((u64)FSL_DMA_DATR_DWRITETYPE_SNOOP_WRITE << 32) : 0;
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hw->dst_addr = CPU_TO_DMA(chan, snoop_bits | dst, 64);
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}
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static dma_addr_t get_desc_dst(struct fsldma_chan *chan,
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struct fsl_desc_sw *desc)
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{
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u64 snoop_bits;
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snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX)
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? ((u64)FSL_DMA_DATR_DWRITETYPE_SNOOP_WRITE << 32) : 0;
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return DMA_TO_CPU(chan, desc->hw.dst_addr, 64) & ~snoop_bits;
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}
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static void set_desc_next(struct fsldma_chan *chan,
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struct fsl_dma_ld_hw *hw, dma_addr_t next)
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{
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u64 snoop_bits;
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snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_83XX)
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? FSL_DMA_SNEN : 0;
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hw->next_ln_addr = CPU_TO_DMA(chan, snoop_bits | next, 64);
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}
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static void set_ld_eol(struct fsldma_chan *chan, struct fsl_desc_sw *desc)
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{
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u64 snoop_bits;
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snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_83XX)
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? FSL_DMA_SNEN : 0;
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desc->hw.next_ln_addr = CPU_TO_DMA(chan,
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DMA_TO_CPU(chan, desc->hw.next_ln_addr, 64) | FSL_DMA_EOL
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| snoop_bits, 64);
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}
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/*
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* DMA Engine Hardware Control Helpers
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*/
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static void dma_init(struct fsldma_chan *chan)
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{
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/* Reset the channel */
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DMA_OUT(chan, &chan->regs->mr, 0, 32);
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switch (chan->feature & FSL_DMA_IP_MASK) {
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case FSL_DMA_IP_85XX:
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/* Set the channel to below modes:
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* EIE - Error interrupt enable
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* EOLNIE - End of links interrupt enable
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* BWC - Bandwidth sharing among channels
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*/
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DMA_OUT(chan, &chan->regs->mr, FSL_DMA_MR_BWC
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| FSL_DMA_MR_EIE | FSL_DMA_MR_EOLNIE, 32);
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break;
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case FSL_DMA_IP_83XX:
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/* Set the channel to below modes:
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* EOTIE - End-of-transfer interrupt enable
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* PRC_RM - PCI read multiple
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*/
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DMA_OUT(chan, &chan->regs->mr, FSL_DMA_MR_EOTIE
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| FSL_DMA_MR_PRC_RM, 32);
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break;
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}
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}
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static int dma_is_idle(struct fsldma_chan *chan)
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{
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u32 sr = get_sr(chan);
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return (!(sr & FSL_DMA_SR_CB)) || (sr & FSL_DMA_SR_CH);
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}
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/*
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* Start the DMA controller
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*
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* Preconditions:
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* - the CDAR register must point to the start descriptor
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* - the MRn[CS] bit must be cleared
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*/
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static void dma_start(struct fsldma_chan *chan)
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{
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u32 mode;
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mode = DMA_IN(chan, &chan->regs->mr, 32);
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if (chan->feature & FSL_DMA_CHAN_PAUSE_EXT) {
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DMA_OUT(chan, &chan->regs->bcr, 0, 32);
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mode |= FSL_DMA_MR_EMP_EN;
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} else {
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mode &= ~FSL_DMA_MR_EMP_EN;
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}
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if (chan->feature & FSL_DMA_CHAN_START_EXT) {
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mode |= FSL_DMA_MR_EMS_EN;
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} else {
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mode &= ~FSL_DMA_MR_EMS_EN;
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mode |= FSL_DMA_MR_CS;
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}
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DMA_OUT(chan, &chan->regs->mr, mode, 32);
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}
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static void dma_halt(struct fsldma_chan *chan)
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{
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u32 mode;
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int i;
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/* read the mode register */
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mode = DMA_IN(chan, &chan->regs->mr, 32);
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/*
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* The 85xx controller supports channel abort, which will stop
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* the current transfer. On 83xx, this bit is the transfer error
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* mask bit, which should not be changed.
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*/
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if ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) {
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mode |= FSL_DMA_MR_CA;
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DMA_OUT(chan, &chan->regs->mr, mode, 32);
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mode &= ~FSL_DMA_MR_CA;
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}
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/* stop the DMA controller */
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mode &= ~(FSL_DMA_MR_CS | FSL_DMA_MR_EMS_EN);
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DMA_OUT(chan, &chan->regs->mr, mode, 32);
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/* wait for the DMA controller to become idle */
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for (i = 0; i < 100; i++) {
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if (dma_is_idle(chan))
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return;
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udelay(10);
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}
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if (!dma_is_idle(chan))
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chan_err(chan, "DMA halt timeout!\n");
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}
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/**
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* fsl_chan_set_src_loop_size - Set source address hold transfer size
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* @chan : Freescale DMA channel
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* @size : Address loop size, 0 for disable loop
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*
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* The set source address hold transfer size. The source
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* address hold or loop transfer size is when the DMA transfer
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* data from source address (SA), if the loop size is 4, the DMA will
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* read data from SA, SA + 1, SA + 2, SA + 3, then loop back to SA,
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* SA + 1 ... and so on.
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*/
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static void fsl_chan_set_src_loop_size(struct fsldma_chan *chan, int size)
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{
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u32 mode;
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mode = DMA_IN(chan, &chan->regs->mr, 32);
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switch (size) {
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case 0:
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mode &= ~FSL_DMA_MR_SAHE;
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break;
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case 1:
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case 2:
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case 4:
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case 8:
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mode |= FSL_DMA_MR_SAHE | (__ilog2(size) << 14);
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break;
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}
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DMA_OUT(chan, &chan->regs->mr, mode, 32);
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}
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/**
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* fsl_chan_set_dst_loop_size - Set destination address hold transfer size
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* @chan : Freescale DMA channel
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* @size : Address loop size, 0 for disable loop
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*
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* The set destination address hold transfer size. The destination
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* address hold or loop transfer size is when the DMA transfer
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* data to destination address (TA), if the loop size is 4, the DMA will
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* write data to TA, TA + 1, TA + 2, TA + 3, then loop back to TA,
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* TA + 1 ... and so on.
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*/
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static void fsl_chan_set_dst_loop_size(struct fsldma_chan *chan, int size)
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{
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u32 mode;
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mode = DMA_IN(chan, &chan->regs->mr, 32);
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switch (size) {
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case 0:
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mode &= ~FSL_DMA_MR_DAHE;
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break;
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case 1:
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case 2:
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case 4:
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case 8:
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mode |= FSL_DMA_MR_DAHE | (__ilog2(size) << 16);
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break;
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}
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DMA_OUT(chan, &chan->regs->mr, mode, 32);
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}
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/**
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* fsl_chan_set_request_count - Set DMA Request Count for external control
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* @chan : Freescale DMA channel
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* @size : Number of bytes to transfer in a single request
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*
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* The Freescale DMA channel can be controlled by the external signal DREQ#.
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* The DMA request count is how many bytes are allowed to transfer before
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* pausing the channel, after which a new assertion of DREQ# resumes channel
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* operation.
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*
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* A size of 0 disables external pause control. The maximum size is 1024.
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*/
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static void fsl_chan_set_request_count(struct fsldma_chan *chan, int size)
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{
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u32 mode;
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BUG_ON(size > 1024);
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mode = DMA_IN(chan, &chan->regs->mr, 32);
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mode |= (__ilog2(size) << 24) & 0x0f000000;
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DMA_OUT(chan, &chan->regs->mr, mode, 32);
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}
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/**
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* fsl_chan_toggle_ext_pause - Toggle channel external pause status
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* @chan : Freescale DMA channel
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* @enable : 0 is disabled, 1 is enabled.
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*
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* The Freescale DMA channel can be controlled by the external signal DREQ#.
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* The DMA Request Count feature should be used in addition to this feature
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* to set the number of bytes to transfer before pausing the channel.
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*/
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static void fsl_chan_toggle_ext_pause(struct fsldma_chan *chan, int enable)
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{
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if (enable)
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chan->feature |= FSL_DMA_CHAN_PAUSE_EXT;
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else
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chan->feature &= ~FSL_DMA_CHAN_PAUSE_EXT;
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}
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/**
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* fsl_chan_toggle_ext_start - Toggle channel external start status
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* @chan : Freescale DMA channel
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* @enable : 0 is disabled, 1 is enabled.
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*
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* If enable the external start, the channel can be started by an
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* external DMA start pin. So the dma_start() does not start the
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* transfer immediately. The DMA channel will wait for the
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* control pin asserted.
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*/
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static void fsl_chan_toggle_ext_start(struct fsldma_chan *chan, int enable)
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{
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if (enable)
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chan->feature |= FSL_DMA_CHAN_START_EXT;
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else
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chan->feature &= ~FSL_DMA_CHAN_START_EXT;
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}
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static void append_ld_queue(struct fsldma_chan *chan, struct fsl_desc_sw *desc)
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{
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struct fsl_desc_sw *tail = to_fsl_desc(chan->ld_pending.prev);
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if (list_empty(&chan->ld_pending))
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goto out_splice;
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/*
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* Add the hardware descriptor to the chain of hardware descriptors
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* that already exists in memory.
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*
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* This will un-set the EOL bit of the existing transaction, and the
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* last link in this transaction will become the EOL descriptor.
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*/
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set_desc_next(chan, &tail->hw, desc->async_tx.phys);
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/*
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* Add the software descriptor and all children to the list
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* of pending transactions
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*/
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out_splice:
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list_splice_tail_init(&desc->tx_list, &chan->ld_pending);
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}
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static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx)
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{
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struct fsldma_chan *chan = to_fsl_chan(tx->chan);
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struct fsl_desc_sw *desc = tx_to_fsl_desc(tx);
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struct fsl_desc_sw *child;
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unsigned long flags;
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dma_cookie_t cookie;
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spin_lock_irqsave(&chan->desc_lock, flags);
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/*
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* assign cookies to all of the software descriptors
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* that make up this transaction
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*/
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list_for_each_entry(child, &desc->tx_list, node) {
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cookie = dma_cookie_assign(&child->async_tx);
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}
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/* put this transaction onto the tail of the pending queue */
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append_ld_queue(chan, desc);
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spin_unlock_irqrestore(&chan->desc_lock, flags);
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return cookie;
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}
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/**
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* fsl_dma_alloc_descriptor - Allocate descriptor from channel's DMA pool.
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* @chan : Freescale DMA channel
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*
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* Return - The descriptor allocated. NULL for failed.
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*/
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static struct fsl_desc_sw *fsl_dma_alloc_descriptor(struct fsldma_chan *chan)
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{
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struct fsl_desc_sw *desc;
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dma_addr_t pdesc;
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desc = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
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if (!desc) {
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chan_dbg(chan, "out of memory for link descriptor\n");
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return NULL;
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}
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memset(desc, 0, sizeof(*desc));
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INIT_LIST_HEAD(&desc->tx_list);
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dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
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desc->async_tx.tx_submit = fsl_dma_tx_submit;
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desc->async_tx.phys = pdesc;
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#ifdef FSL_DMA_LD_DEBUG
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chan_dbg(chan, "LD %p allocated\n", desc);
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#endif
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return desc;
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}
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|
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/**
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* fsl_dma_alloc_chan_resources - Allocate resources for DMA channel.
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* @chan : Freescale DMA channel
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*
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* This function will create a dma pool for descriptor allocation.
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*
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* Return - The number of descriptors allocated.
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*/
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static int fsl_dma_alloc_chan_resources(struct dma_chan *dchan)
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{
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struct fsldma_chan *chan = to_fsl_chan(dchan);
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/* Has this channel already been allocated? */
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if (chan->desc_pool)
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return 1;
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|
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/*
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* We need the descriptor to be aligned to 32bytes
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* for meeting FSL DMA specification requirement.
|
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*/
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chan->desc_pool = dma_pool_create(chan->name, chan->dev,
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sizeof(struct fsl_desc_sw),
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__alignof__(struct fsl_desc_sw), 0);
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if (!chan->desc_pool) {
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chan_err(chan, "unable to allocate descriptor pool\n");
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return -ENOMEM;
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}
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|
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/* there is at least one descriptor free to be allocated */
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return 1;
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}
|
|
|
|
/**
|
|
* fsldma_free_desc_list - Free all descriptors in a queue
|
|
* @chan: Freescae DMA channel
|
|
* @list: the list to free
|
|
*
|
|
* LOCKING: must hold chan->desc_lock
|
|
*/
|
|
static void fsldma_free_desc_list(struct fsldma_chan *chan,
|
|
struct list_head *list)
|
|
{
|
|
struct fsl_desc_sw *desc, *_desc;
|
|
|
|
list_for_each_entry_safe(desc, _desc, list, node) {
|
|
list_del(&desc->node);
|
|
#ifdef FSL_DMA_LD_DEBUG
|
|
chan_dbg(chan, "LD %p free\n", desc);
|
|
#endif
|
|
dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
|
|
}
|
|
}
|
|
|
|
static void fsldma_free_desc_list_reverse(struct fsldma_chan *chan,
|
|
struct list_head *list)
|
|
{
|
|
struct fsl_desc_sw *desc, *_desc;
|
|
|
|
list_for_each_entry_safe_reverse(desc, _desc, list, node) {
|
|
list_del(&desc->node);
|
|
#ifdef FSL_DMA_LD_DEBUG
|
|
chan_dbg(chan, "LD %p free\n", desc);
|
|
#endif
|
|
dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fsl_dma_free_chan_resources - Free all resources of the channel.
|
|
* @chan : Freescale DMA channel
|
|
*/
|
|
static void fsl_dma_free_chan_resources(struct dma_chan *dchan)
|
|
{
|
|
struct fsldma_chan *chan = to_fsl_chan(dchan);
|
|
unsigned long flags;
|
|
|
|
chan_dbg(chan, "free all channel resources\n");
|
|
spin_lock_irqsave(&chan->desc_lock, flags);
|
|
fsldma_free_desc_list(chan, &chan->ld_pending);
|
|
fsldma_free_desc_list(chan, &chan->ld_running);
|
|
spin_unlock_irqrestore(&chan->desc_lock, flags);
|
|
|
|
dma_pool_destroy(chan->desc_pool);
|
|
chan->desc_pool = NULL;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *
|
|
fsl_dma_prep_interrupt(struct dma_chan *dchan, unsigned long flags)
|
|
{
|
|
struct fsldma_chan *chan;
|
|
struct fsl_desc_sw *new;
|
|
|
|
if (!dchan)
|
|
return NULL;
|
|
|
|
chan = to_fsl_chan(dchan);
|
|
|
|
new = fsl_dma_alloc_descriptor(chan);
|
|
if (!new) {
|
|
chan_err(chan, "%s\n", msg_ld_oom);
|
|
return NULL;
|
|
}
|
|
|
|
new->async_tx.cookie = -EBUSY;
|
|
new->async_tx.flags = flags;
|
|
|
|
/* Insert the link descriptor to the LD ring */
|
|
list_add_tail(&new->node, &new->tx_list);
|
|
|
|
/* Set End-of-link to the last link descriptor of new list */
|
|
set_ld_eol(chan, new);
|
|
|
|
return &new->async_tx;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *
|
|
fsl_dma_prep_memcpy(struct dma_chan *dchan,
|
|
dma_addr_t dma_dst, dma_addr_t dma_src,
|
|
size_t len, unsigned long flags)
|
|
{
|
|
struct fsldma_chan *chan;
|
|
struct fsl_desc_sw *first = NULL, *prev = NULL, *new;
|
|
size_t copy;
|
|
|
|
if (!dchan)
|
|
return NULL;
|
|
|
|
if (!len)
|
|
return NULL;
|
|
|
|
chan = to_fsl_chan(dchan);
|
|
|
|
do {
|
|
|
|
/* Allocate the link descriptor from DMA pool */
|
|
new = fsl_dma_alloc_descriptor(chan);
|
|
if (!new) {
|
|
chan_err(chan, "%s\n", msg_ld_oom);
|
|
goto fail;
|
|
}
|
|
|
|
copy = min(len, (size_t)FSL_DMA_BCR_MAX_CNT);
|
|
|
|
set_desc_cnt(chan, &new->hw, copy);
|
|
set_desc_src(chan, &new->hw, dma_src);
|
|
set_desc_dst(chan, &new->hw, dma_dst);
|
|
|
|
if (!first)
|
|
first = new;
|
|
else
|
|
set_desc_next(chan, &prev->hw, new->async_tx.phys);
|
|
|
|
new->async_tx.cookie = 0;
|
|
async_tx_ack(&new->async_tx);
|
|
|
|
prev = new;
|
|
len -= copy;
|
|
dma_src += copy;
|
|
dma_dst += copy;
|
|
|
|
/* Insert the link descriptor to the LD ring */
|
|
list_add_tail(&new->node, &first->tx_list);
|
|
} while (len);
|
|
|
|
new->async_tx.flags = flags; /* client is in control of this ack */
|
|
new->async_tx.cookie = -EBUSY;
|
|
|
|
/* Set End-of-link to the last link descriptor of new list */
|
|
set_ld_eol(chan, new);
|
|
|
|
return &first->async_tx;
|
|
|
|
fail:
|
|
if (!first)
|
|
return NULL;
|
|
|
|
fsldma_free_desc_list_reverse(chan, &first->tx_list);
|
|
return NULL;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *fsl_dma_prep_sg(struct dma_chan *dchan,
|
|
struct scatterlist *dst_sg, unsigned int dst_nents,
|
|
struct scatterlist *src_sg, unsigned int src_nents,
|
|
unsigned long flags)
|
|
{
|
|
struct fsl_desc_sw *first = NULL, *prev = NULL, *new = NULL;
|
|
struct fsldma_chan *chan = to_fsl_chan(dchan);
|
|
size_t dst_avail, src_avail;
|
|
dma_addr_t dst, src;
|
|
size_t len;
|
|
|
|
/* basic sanity checks */
|
|
if (dst_nents == 0 || src_nents == 0)
|
|
return NULL;
|
|
|
|
if (dst_sg == NULL || src_sg == NULL)
|
|
return NULL;
|
|
|
|
/*
|
|
* TODO: should we check that both scatterlists have the same
|
|
* TODO: number of bytes in total? Is that really an error?
|
|
*/
|
|
|
|
/* get prepared for the loop */
|
|
dst_avail = sg_dma_len(dst_sg);
|
|
src_avail = sg_dma_len(src_sg);
|
|
|
|
/* run until we are out of scatterlist entries */
|
|
while (true) {
|
|
|
|
/* create the largest transaction possible */
|
|
len = min_t(size_t, src_avail, dst_avail);
|
|
len = min_t(size_t, len, FSL_DMA_BCR_MAX_CNT);
|
|
if (len == 0)
|
|
goto fetch;
|
|
|
|
dst = sg_dma_address(dst_sg) + sg_dma_len(dst_sg) - dst_avail;
|
|
src = sg_dma_address(src_sg) + sg_dma_len(src_sg) - src_avail;
|
|
|
|
/* allocate and populate the descriptor */
|
|
new = fsl_dma_alloc_descriptor(chan);
|
|
if (!new) {
|
|
chan_err(chan, "%s\n", msg_ld_oom);
|
|
goto fail;
|
|
}
|
|
|
|
set_desc_cnt(chan, &new->hw, len);
|
|
set_desc_src(chan, &new->hw, src);
|
|
set_desc_dst(chan, &new->hw, dst);
|
|
|
|
if (!first)
|
|
first = new;
|
|
else
|
|
set_desc_next(chan, &prev->hw, new->async_tx.phys);
|
|
|
|
new->async_tx.cookie = 0;
|
|
async_tx_ack(&new->async_tx);
|
|
prev = new;
|
|
|
|
/* Insert the link descriptor to the LD ring */
|
|
list_add_tail(&new->node, &first->tx_list);
|
|
|
|
/* update metadata */
|
|
dst_avail -= len;
|
|
src_avail -= len;
|
|
|
|
fetch:
|
|
/* fetch the next dst scatterlist entry */
|
|
if (dst_avail == 0) {
|
|
|
|
/* no more entries: we're done */
|
|
if (dst_nents == 0)
|
|
break;
|
|
|
|
/* fetch the next entry: if there are no more: done */
|
|
dst_sg = sg_next(dst_sg);
|
|
if (dst_sg == NULL)
|
|
break;
|
|
|
|
dst_nents--;
|
|
dst_avail = sg_dma_len(dst_sg);
|
|
}
|
|
|
|
/* fetch the next src scatterlist entry */
|
|
if (src_avail == 0) {
|
|
|
|
/* no more entries: we're done */
|
|
if (src_nents == 0)
|
|
break;
|
|
|
|
/* fetch the next entry: if there are no more: done */
|
|
src_sg = sg_next(src_sg);
|
|
if (src_sg == NULL)
|
|
break;
|
|
|
|
src_nents--;
|
|
src_avail = sg_dma_len(src_sg);
|
|
}
|
|
}
|
|
|
|
new->async_tx.flags = flags; /* client is in control of this ack */
|
|
new->async_tx.cookie = -EBUSY;
|
|
|
|
/* Set End-of-link to the last link descriptor of new list */
|
|
set_ld_eol(chan, new);
|
|
|
|
return &first->async_tx;
|
|
|
|
fail:
|
|
if (!first)
|
|
return NULL;
|
|
|
|
fsldma_free_desc_list_reverse(chan, &first->tx_list);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* fsl_dma_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction
|
|
* @chan: DMA channel
|
|
* @sgl: scatterlist to transfer to/from
|
|
* @sg_len: number of entries in @scatterlist
|
|
* @direction: DMA direction
|
|
* @flags: DMAEngine flags
|
|
*
|
|
* Prepare a set of descriptors for a DMA_SLAVE transaction. Following the
|
|
* DMA_SLAVE API, this gets the device-specific information from the
|
|
* chan->private variable.
|
|
*/
|
|
static struct dma_async_tx_descriptor *fsl_dma_prep_slave_sg(
|
|
struct dma_chan *dchan, struct scatterlist *sgl, unsigned int sg_len,
|
|
enum dma_transfer_direction direction, unsigned long flags)
|
|
{
|
|
/*
|
|
* This operation is not supported on the Freescale DMA controller
|
|
*
|
|
* However, we need to provide the function pointer to allow the
|
|
* device_control() method to work.
|
|
*/
|
|
return NULL;
|
|
}
|
|
|
|
static int fsl_dma_device_control(struct dma_chan *dchan,
|
|
enum dma_ctrl_cmd cmd, unsigned long arg)
|
|
{
|
|
struct dma_slave_config *config;
|
|
struct fsldma_chan *chan;
|
|
unsigned long flags;
|
|
int size;
|
|
|
|
if (!dchan)
|
|
return -EINVAL;
|
|
|
|
chan = to_fsl_chan(dchan);
|
|
|
|
switch (cmd) {
|
|
case DMA_TERMINATE_ALL:
|
|
spin_lock_irqsave(&chan->desc_lock, flags);
|
|
|
|
/* Halt the DMA engine */
|
|
dma_halt(chan);
|
|
|
|
/* Remove and free all of the descriptors in the LD queue */
|
|
fsldma_free_desc_list(chan, &chan->ld_pending);
|
|
fsldma_free_desc_list(chan, &chan->ld_running);
|
|
chan->idle = true;
|
|
|
|
spin_unlock_irqrestore(&chan->desc_lock, flags);
|
|
return 0;
|
|
|
|
case DMA_SLAVE_CONFIG:
|
|
config = (struct dma_slave_config *)arg;
|
|
|
|
/* make sure the channel supports setting burst size */
|
|
if (!chan->set_request_count)
|
|
return -ENXIO;
|
|
|
|
/* we set the controller burst size depending on direction */
|
|
if (config->direction == DMA_MEM_TO_DEV)
|
|
size = config->dst_addr_width * config->dst_maxburst;
|
|
else
|
|
size = config->src_addr_width * config->src_maxburst;
|
|
|
|
chan->set_request_count(chan, size);
|
|
return 0;
|
|
|
|
case FSLDMA_EXTERNAL_START:
|
|
|
|
/* make sure the channel supports external start */
|
|
if (!chan->toggle_ext_start)
|
|
return -ENXIO;
|
|
|
|
chan->toggle_ext_start(chan, arg);
|
|
return 0;
|
|
|
|
default:
|
|
return -ENXIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fsldma_cleanup_descriptor - cleanup and free a single link descriptor
|
|
* @chan: Freescale DMA channel
|
|
* @desc: descriptor to cleanup and free
|
|
*
|
|
* This function is used on a descriptor which has been executed by the DMA
|
|
* controller. It will run any callbacks, submit any dependencies, and then
|
|
* free the descriptor.
|
|
*/
|
|
static void fsldma_cleanup_descriptor(struct fsldma_chan *chan,
|
|
struct fsl_desc_sw *desc)
|
|
{
|
|
struct dma_async_tx_descriptor *txd = &desc->async_tx;
|
|
struct device *dev = chan->common.device->dev;
|
|
dma_addr_t src = get_desc_src(chan, desc);
|
|
dma_addr_t dst = get_desc_dst(chan, desc);
|
|
u32 len = get_desc_cnt(chan, desc);
|
|
|
|
/* Run the link descriptor callback function */
|
|
if (txd->callback) {
|
|
#ifdef FSL_DMA_LD_DEBUG
|
|
chan_dbg(chan, "LD %p callback\n", desc);
|
|
#endif
|
|
txd->callback(txd->callback_param);
|
|
}
|
|
|
|
/* Run any dependencies */
|
|
dma_run_dependencies(txd);
|
|
|
|
/* Unmap the dst buffer, if requested */
|
|
if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
|
|
if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE)
|
|
dma_unmap_single(dev, dst, len, DMA_FROM_DEVICE);
|
|
else
|
|
dma_unmap_page(dev, dst, len, DMA_FROM_DEVICE);
|
|
}
|
|
|
|
/* Unmap the src buffer, if requested */
|
|
if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
|
|
if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE)
|
|
dma_unmap_single(dev, src, len, DMA_TO_DEVICE);
|
|
else
|
|
dma_unmap_page(dev, src, len, DMA_TO_DEVICE);
|
|
}
|
|
|
|
#ifdef FSL_DMA_LD_DEBUG
|
|
chan_dbg(chan, "LD %p free\n", desc);
|
|
#endif
|
|
dma_pool_free(chan->desc_pool, desc, txd->phys);
|
|
}
|
|
|
|
/**
|
|
* fsl_chan_xfer_ld_queue - transfer any pending transactions
|
|
* @chan : Freescale DMA channel
|
|
*
|
|
* HARDWARE STATE: idle
|
|
* LOCKING: must hold chan->desc_lock
|
|
*/
|
|
static void fsl_chan_xfer_ld_queue(struct fsldma_chan *chan)
|
|
{
|
|
struct fsl_desc_sw *desc;
|
|
|
|
/*
|
|
* If the list of pending descriptors is empty, then we
|
|
* don't need to do any work at all
|
|
*/
|
|
if (list_empty(&chan->ld_pending)) {
|
|
chan_dbg(chan, "no pending LDs\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* The DMA controller is not idle, which means that the interrupt
|
|
* handler will start any queued transactions when it runs after
|
|
* this transaction finishes
|
|
*/
|
|
if (!chan->idle) {
|
|
chan_dbg(chan, "DMA controller still busy\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If there are some link descriptors which have not been
|
|
* transferred, we need to start the controller
|
|
*/
|
|
|
|
/*
|
|
* Move all elements from the queue of pending transactions
|
|
* onto the list of running transactions
|
|
*/
|
|
chan_dbg(chan, "idle, starting controller\n");
|
|
desc = list_first_entry(&chan->ld_pending, struct fsl_desc_sw, node);
|
|
list_splice_tail_init(&chan->ld_pending, &chan->ld_running);
|
|
|
|
/*
|
|
* The 85xx DMA controller doesn't clear the channel start bit
|
|
* automatically at the end of a transfer. Therefore we must clear
|
|
* it in software before starting the transfer.
|
|
*/
|
|
if ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) {
|
|
u32 mode;
|
|
|
|
mode = DMA_IN(chan, &chan->regs->mr, 32);
|
|
mode &= ~FSL_DMA_MR_CS;
|
|
DMA_OUT(chan, &chan->regs->mr, mode, 32);
|
|
}
|
|
|
|
/*
|
|
* Program the descriptor's address into the DMA controller,
|
|
* then start the DMA transaction
|
|
*/
|
|
set_cdar(chan, desc->async_tx.phys);
|
|
get_cdar(chan);
|
|
|
|
dma_start(chan);
|
|
chan->idle = false;
|
|
}
|
|
|
|
/**
|
|
* fsl_dma_memcpy_issue_pending - Issue the DMA start command
|
|
* @chan : Freescale DMA channel
|
|
*/
|
|
static void fsl_dma_memcpy_issue_pending(struct dma_chan *dchan)
|
|
{
|
|
struct fsldma_chan *chan = to_fsl_chan(dchan);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&chan->desc_lock, flags);
|
|
fsl_chan_xfer_ld_queue(chan);
|
|
spin_unlock_irqrestore(&chan->desc_lock, flags);
|
|
}
|
|
|
|
/**
|
|
* fsl_tx_status - Determine the DMA status
|
|
* @chan : Freescale DMA channel
|
|
*/
|
|
static enum dma_status fsl_tx_status(struct dma_chan *dchan,
|
|
dma_cookie_t cookie,
|
|
struct dma_tx_state *txstate)
|
|
{
|
|
struct fsldma_chan *chan = to_fsl_chan(dchan);
|
|
dma_cookie_t last_complete;
|
|
dma_cookie_t last_used;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&chan->desc_lock, flags);
|
|
|
|
last_complete = dchan->completed_cookie;
|
|
last_used = dchan->cookie;
|
|
|
|
spin_unlock_irqrestore(&chan->desc_lock, flags);
|
|
|
|
dma_set_tx_state(txstate, last_complete, last_used, 0);
|
|
return dma_async_is_complete(cookie, last_complete, last_used);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/* Interrupt Handling */
|
|
/*----------------------------------------------------------------------------*/
|
|
|
|
static irqreturn_t fsldma_chan_irq(int irq, void *data)
|
|
{
|
|
struct fsldma_chan *chan = data;
|
|
u32 stat;
|
|
|
|
/* save and clear the status register */
|
|
stat = get_sr(chan);
|
|
set_sr(chan, stat);
|
|
chan_dbg(chan, "irq: stat = 0x%x\n", stat);
|
|
|
|
/* check that this was really our device */
|
|
stat &= ~(FSL_DMA_SR_CB | FSL_DMA_SR_CH);
|
|
if (!stat)
|
|
return IRQ_NONE;
|
|
|
|
if (stat & FSL_DMA_SR_TE)
|
|
chan_err(chan, "Transfer Error!\n");
|
|
|
|
/*
|
|
* Programming Error
|
|
* The DMA_INTERRUPT async_tx is a NULL transfer, which will
|
|
* triger a PE interrupt.
|
|
*/
|
|
if (stat & FSL_DMA_SR_PE) {
|
|
chan_dbg(chan, "irq: Programming Error INT\n");
|
|
stat &= ~FSL_DMA_SR_PE;
|
|
if (get_bcr(chan) != 0)
|
|
chan_err(chan, "Programming Error!\n");
|
|
}
|
|
|
|
/*
|
|
* For MPC8349, EOCDI event need to update cookie
|
|
* and start the next transfer if it exist.
|
|
*/
|
|
if (stat & FSL_DMA_SR_EOCDI) {
|
|
chan_dbg(chan, "irq: End-of-Chain link INT\n");
|
|
stat &= ~FSL_DMA_SR_EOCDI;
|
|
}
|
|
|
|
/*
|
|
* If it current transfer is the end-of-transfer,
|
|
* we should clear the Channel Start bit for
|
|
* prepare next transfer.
|
|
*/
|
|
if (stat & FSL_DMA_SR_EOLNI) {
|
|
chan_dbg(chan, "irq: End-of-link INT\n");
|
|
stat &= ~FSL_DMA_SR_EOLNI;
|
|
}
|
|
|
|
/* check that the DMA controller is really idle */
|
|
if (!dma_is_idle(chan))
|
|
chan_err(chan, "irq: controller not idle!\n");
|
|
|
|
/* check that we handled all of the bits */
|
|
if (stat)
|
|
chan_err(chan, "irq: unhandled sr 0x%08x\n", stat);
|
|
|
|
/*
|
|
* Schedule the tasklet to handle all cleanup of the current
|
|
* transaction. It will start a new transaction if there is
|
|
* one pending.
|
|
*/
|
|
tasklet_schedule(&chan->tasklet);
|
|
chan_dbg(chan, "irq: Exit\n");
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void dma_do_tasklet(unsigned long data)
|
|
{
|
|
struct fsldma_chan *chan = (struct fsldma_chan *)data;
|
|
struct fsl_desc_sw *desc, *_desc;
|
|
LIST_HEAD(ld_cleanup);
|
|
unsigned long flags;
|
|
|
|
chan_dbg(chan, "tasklet entry\n");
|
|
|
|
spin_lock_irqsave(&chan->desc_lock, flags);
|
|
|
|
/* update the cookie if we have some descriptors to cleanup */
|
|
if (!list_empty(&chan->ld_running)) {
|
|
dma_cookie_t cookie;
|
|
|
|
desc = to_fsl_desc(chan->ld_running.prev);
|
|
cookie = desc->async_tx.cookie;
|
|
|
|
chan->common.completed_cookie = cookie;
|
|
chan_dbg(chan, "completed_cookie=%d\n", cookie);
|
|
}
|
|
|
|
/*
|
|
* move the descriptors to a temporary list so we can drop the lock
|
|
* during the entire cleanup operation
|
|
*/
|
|
list_splice_tail_init(&chan->ld_running, &ld_cleanup);
|
|
|
|
/* the hardware is now idle and ready for more */
|
|
chan->idle = true;
|
|
|
|
/*
|
|
* Start any pending transactions automatically
|
|
*
|
|
* In the ideal case, we keep the DMA controller busy while we go
|
|
* ahead and free the descriptors below.
|
|
*/
|
|
fsl_chan_xfer_ld_queue(chan);
|
|
spin_unlock_irqrestore(&chan->desc_lock, flags);
|
|
|
|
/* Run the callback for each descriptor, in order */
|
|
list_for_each_entry_safe(desc, _desc, &ld_cleanup, node) {
|
|
|
|
/* Remove from the list of transactions */
|
|
list_del(&desc->node);
|
|
|
|
/* Run all cleanup for this descriptor */
|
|
fsldma_cleanup_descriptor(chan, desc);
|
|
}
|
|
|
|
chan_dbg(chan, "tasklet exit\n");
|
|
}
|
|
|
|
static irqreturn_t fsldma_ctrl_irq(int irq, void *data)
|
|
{
|
|
struct fsldma_device *fdev = data;
|
|
struct fsldma_chan *chan;
|
|
unsigned int handled = 0;
|
|
u32 gsr, mask;
|
|
int i;
|
|
|
|
gsr = (fdev->feature & FSL_DMA_BIG_ENDIAN) ? in_be32(fdev->regs)
|
|
: in_le32(fdev->regs);
|
|
mask = 0xff000000;
|
|
dev_dbg(fdev->dev, "IRQ: gsr 0x%.8x\n", gsr);
|
|
|
|
for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
|
|
chan = fdev->chan[i];
|
|
if (!chan)
|
|
continue;
|
|
|
|
if (gsr & mask) {
|
|
dev_dbg(fdev->dev, "IRQ: chan %d\n", chan->id);
|
|
fsldma_chan_irq(irq, chan);
|
|
handled++;
|
|
}
|
|
|
|
gsr &= ~mask;
|
|
mask >>= 8;
|
|
}
|
|
|
|
return IRQ_RETVAL(handled);
|
|
}
|
|
|
|
static void fsldma_free_irqs(struct fsldma_device *fdev)
|
|
{
|
|
struct fsldma_chan *chan;
|
|
int i;
|
|
|
|
if (fdev->irq != NO_IRQ) {
|
|
dev_dbg(fdev->dev, "free per-controller IRQ\n");
|
|
free_irq(fdev->irq, fdev);
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
|
|
chan = fdev->chan[i];
|
|
if (chan && chan->irq != NO_IRQ) {
|
|
chan_dbg(chan, "free per-channel IRQ\n");
|
|
free_irq(chan->irq, chan);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int fsldma_request_irqs(struct fsldma_device *fdev)
|
|
{
|
|
struct fsldma_chan *chan;
|
|
int ret;
|
|
int i;
|
|
|
|
/* if we have a per-controller IRQ, use that */
|
|
if (fdev->irq != NO_IRQ) {
|
|
dev_dbg(fdev->dev, "request per-controller IRQ\n");
|
|
ret = request_irq(fdev->irq, fsldma_ctrl_irq, IRQF_SHARED,
|
|
"fsldma-controller", fdev);
|
|
return ret;
|
|
}
|
|
|
|
/* no per-controller IRQ, use the per-channel IRQs */
|
|
for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
|
|
chan = fdev->chan[i];
|
|
if (!chan)
|
|
continue;
|
|
|
|
if (chan->irq == NO_IRQ) {
|
|
chan_err(chan, "interrupts property missing in device tree\n");
|
|
ret = -ENODEV;
|
|
goto out_unwind;
|
|
}
|
|
|
|
chan_dbg(chan, "request per-channel IRQ\n");
|
|
ret = request_irq(chan->irq, fsldma_chan_irq, IRQF_SHARED,
|
|
"fsldma-chan", chan);
|
|
if (ret) {
|
|
chan_err(chan, "unable to request per-channel IRQ\n");
|
|
goto out_unwind;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unwind:
|
|
for (/* none */; i >= 0; i--) {
|
|
chan = fdev->chan[i];
|
|
if (!chan)
|
|
continue;
|
|
|
|
if (chan->irq == NO_IRQ)
|
|
continue;
|
|
|
|
free_irq(chan->irq, chan);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/* OpenFirmware Subsystem */
|
|
/*----------------------------------------------------------------------------*/
|
|
|
|
static int __devinit fsl_dma_chan_probe(struct fsldma_device *fdev,
|
|
struct device_node *node, u32 feature, const char *compatible)
|
|
{
|
|
struct fsldma_chan *chan;
|
|
struct resource res;
|
|
int err;
|
|
|
|
/* alloc channel */
|
|
chan = kzalloc(sizeof(*chan), GFP_KERNEL);
|
|
if (!chan) {
|
|
dev_err(fdev->dev, "no free memory for DMA channels!\n");
|
|
err = -ENOMEM;
|
|
goto out_return;
|
|
}
|
|
|
|
/* ioremap registers for use */
|
|
chan->regs = of_iomap(node, 0);
|
|
if (!chan->regs) {
|
|
dev_err(fdev->dev, "unable to ioremap registers\n");
|
|
err = -ENOMEM;
|
|
goto out_free_chan;
|
|
}
|
|
|
|
err = of_address_to_resource(node, 0, &res);
|
|
if (err) {
|
|
dev_err(fdev->dev, "unable to find 'reg' property\n");
|
|
goto out_iounmap_regs;
|
|
}
|
|
|
|
chan->feature = feature;
|
|
if (!fdev->feature)
|
|
fdev->feature = chan->feature;
|
|
|
|
/*
|
|
* If the DMA device's feature is different than the feature
|
|
* of its channels, report the bug
|
|
*/
|
|
WARN_ON(fdev->feature != chan->feature);
|
|
|
|
chan->dev = fdev->dev;
|
|
chan->id = ((res.start - 0x100) & 0xfff) >> 7;
|
|
if (chan->id >= FSL_DMA_MAX_CHANS_PER_DEVICE) {
|
|
dev_err(fdev->dev, "too many channels for device\n");
|
|
err = -EINVAL;
|
|
goto out_iounmap_regs;
|
|
}
|
|
|
|
fdev->chan[chan->id] = chan;
|
|
tasklet_init(&chan->tasklet, dma_do_tasklet, (unsigned long)chan);
|
|
snprintf(chan->name, sizeof(chan->name), "chan%d", chan->id);
|
|
|
|
/* Initialize the channel */
|
|
dma_init(chan);
|
|
|
|
/* Clear cdar registers */
|
|
set_cdar(chan, 0);
|
|
|
|
switch (chan->feature & FSL_DMA_IP_MASK) {
|
|
case FSL_DMA_IP_85XX:
|
|
chan->toggle_ext_pause = fsl_chan_toggle_ext_pause;
|
|
case FSL_DMA_IP_83XX:
|
|
chan->toggle_ext_start = fsl_chan_toggle_ext_start;
|
|
chan->set_src_loop_size = fsl_chan_set_src_loop_size;
|
|
chan->set_dst_loop_size = fsl_chan_set_dst_loop_size;
|
|
chan->set_request_count = fsl_chan_set_request_count;
|
|
}
|
|
|
|
spin_lock_init(&chan->desc_lock);
|
|
INIT_LIST_HEAD(&chan->ld_pending);
|
|
INIT_LIST_HEAD(&chan->ld_running);
|
|
chan->idle = true;
|
|
|
|
chan->common.device = &fdev->common;
|
|
|
|
/* find the IRQ line, if it exists in the device tree */
|
|
chan->irq = irq_of_parse_and_map(node, 0);
|
|
|
|
/* Add the channel to DMA device channel list */
|
|
list_add_tail(&chan->common.device_node, &fdev->common.channels);
|
|
fdev->common.chancnt++;
|
|
|
|
dev_info(fdev->dev, "#%d (%s), irq %d\n", chan->id, compatible,
|
|
chan->irq != NO_IRQ ? chan->irq : fdev->irq);
|
|
|
|
return 0;
|
|
|
|
out_iounmap_regs:
|
|
iounmap(chan->regs);
|
|
out_free_chan:
|
|
kfree(chan);
|
|
out_return:
|
|
return err;
|
|
}
|
|
|
|
static void fsl_dma_chan_remove(struct fsldma_chan *chan)
|
|
{
|
|
irq_dispose_mapping(chan->irq);
|
|
list_del(&chan->common.device_node);
|
|
iounmap(chan->regs);
|
|
kfree(chan);
|
|
}
|
|
|
|
static int __devinit fsldma_of_probe(struct platform_device *op)
|
|
{
|
|
struct fsldma_device *fdev;
|
|
struct device_node *child;
|
|
int err;
|
|
|
|
fdev = kzalloc(sizeof(*fdev), GFP_KERNEL);
|
|
if (!fdev) {
|
|
dev_err(&op->dev, "No enough memory for 'priv'\n");
|
|
err = -ENOMEM;
|
|
goto out_return;
|
|
}
|
|
|
|
fdev->dev = &op->dev;
|
|
INIT_LIST_HEAD(&fdev->common.channels);
|
|
|
|
/* ioremap the registers for use */
|
|
fdev->regs = of_iomap(op->dev.of_node, 0);
|
|
if (!fdev->regs) {
|
|
dev_err(&op->dev, "unable to ioremap registers\n");
|
|
err = -ENOMEM;
|
|
goto out_free_fdev;
|
|
}
|
|
|
|
/* map the channel IRQ if it exists, but don't hookup the handler yet */
|
|
fdev->irq = irq_of_parse_and_map(op->dev.of_node, 0);
|
|
|
|
dma_cap_set(DMA_MEMCPY, fdev->common.cap_mask);
|
|
dma_cap_set(DMA_INTERRUPT, fdev->common.cap_mask);
|
|
dma_cap_set(DMA_SG, fdev->common.cap_mask);
|
|
dma_cap_set(DMA_SLAVE, fdev->common.cap_mask);
|
|
fdev->common.device_alloc_chan_resources = fsl_dma_alloc_chan_resources;
|
|
fdev->common.device_free_chan_resources = fsl_dma_free_chan_resources;
|
|
fdev->common.device_prep_dma_interrupt = fsl_dma_prep_interrupt;
|
|
fdev->common.device_prep_dma_memcpy = fsl_dma_prep_memcpy;
|
|
fdev->common.device_prep_dma_sg = fsl_dma_prep_sg;
|
|
fdev->common.device_tx_status = fsl_tx_status;
|
|
fdev->common.device_issue_pending = fsl_dma_memcpy_issue_pending;
|
|
fdev->common.device_prep_slave_sg = fsl_dma_prep_slave_sg;
|
|
fdev->common.device_control = fsl_dma_device_control;
|
|
fdev->common.dev = &op->dev;
|
|
|
|
dma_set_mask(&(op->dev), DMA_BIT_MASK(36));
|
|
|
|
dev_set_drvdata(&op->dev, fdev);
|
|
|
|
/*
|
|
* We cannot use of_platform_bus_probe() because there is no
|
|
* of_platform_bus_remove(). Instead, we manually instantiate every DMA
|
|
* channel object.
|
|
*/
|
|
for_each_child_of_node(op->dev.of_node, child) {
|
|
if (of_device_is_compatible(child, "fsl,eloplus-dma-channel")) {
|
|
fsl_dma_chan_probe(fdev, child,
|
|
FSL_DMA_IP_85XX | FSL_DMA_BIG_ENDIAN,
|
|
"fsl,eloplus-dma-channel");
|
|
}
|
|
|
|
if (of_device_is_compatible(child, "fsl,elo-dma-channel")) {
|
|
fsl_dma_chan_probe(fdev, child,
|
|
FSL_DMA_IP_83XX | FSL_DMA_LITTLE_ENDIAN,
|
|
"fsl,elo-dma-channel");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Hookup the IRQ handler(s)
|
|
*
|
|
* If we have a per-controller interrupt, we prefer that to the
|
|
* per-channel interrupts to reduce the number of shared interrupt
|
|
* handlers on the same IRQ line
|
|
*/
|
|
err = fsldma_request_irqs(fdev);
|
|
if (err) {
|
|
dev_err(fdev->dev, "unable to request IRQs\n");
|
|
goto out_free_fdev;
|
|
}
|
|
|
|
dma_async_device_register(&fdev->common);
|
|
return 0;
|
|
|
|
out_free_fdev:
|
|
irq_dispose_mapping(fdev->irq);
|
|
kfree(fdev);
|
|
out_return:
|
|
return err;
|
|
}
|
|
|
|
static int fsldma_of_remove(struct platform_device *op)
|
|
{
|
|
struct fsldma_device *fdev;
|
|
unsigned int i;
|
|
|
|
fdev = dev_get_drvdata(&op->dev);
|
|
dma_async_device_unregister(&fdev->common);
|
|
|
|
fsldma_free_irqs(fdev);
|
|
|
|
for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
|
|
if (fdev->chan[i])
|
|
fsl_dma_chan_remove(fdev->chan[i]);
|
|
}
|
|
|
|
iounmap(fdev->regs);
|
|
dev_set_drvdata(&op->dev, NULL);
|
|
kfree(fdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id fsldma_of_ids[] = {
|
|
{ .compatible = "fsl,eloplus-dma", },
|
|
{ .compatible = "fsl,elo-dma", },
|
|
{}
|
|
};
|
|
|
|
static struct platform_driver fsldma_of_driver = {
|
|
.driver = {
|
|
.name = "fsl-elo-dma",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = fsldma_of_ids,
|
|
},
|
|
.probe = fsldma_of_probe,
|
|
.remove = fsldma_of_remove,
|
|
};
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/* Module Init / Exit */
|
|
/*----------------------------------------------------------------------------*/
|
|
|
|
static __init int fsldma_init(void)
|
|
{
|
|
pr_info("Freescale Elo / Elo Plus DMA driver\n");
|
|
return platform_driver_register(&fsldma_of_driver);
|
|
}
|
|
|
|
static void __exit fsldma_exit(void)
|
|
{
|
|
platform_driver_unregister(&fsldma_of_driver);
|
|
}
|
|
|
|
subsys_initcall(fsldma_init);
|
|
module_exit(fsldma_exit);
|
|
|
|
MODULE_DESCRIPTION("Freescale Elo / Elo Plus DMA driver");
|
|
MODULE_LICENSE("GPL");
|