Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Freescale MPC85xx, MPC83xx DMA Engine support |
| 3 | * |
Li Yang | e2c8e425 | 2010-11-11 20:16:29 +0800 | [diff] [blame] | 4 | * Copyright (C) 2007-2010 Freescale Semiconductor, Inc. All rights reserved. |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 5 | * |
| 6 | * Author: |
| 7 | * Zhang Wei <wei.zhang@freescale.com>, Jul 2007 |
| 8 | * Ebony Zhu <ebony.zhu@freescale.com>, May 2007 |
| 9 | * |
| 10 | * Description: |
| 11 | * DMA engine driver for Freescale MPC8540 DMA controller, which is |
| 12 | * also fit for MPC8560, MPC8555, MPC8548, MPC8641, and etc. |
Stefan Weil | c2e07b3 | 2010-08-03 19:44:52 +0200 | [diff] [blame] | 13 | * The support for MPC8349 DMA controller is also added. |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 14 | * |
Ira W. Snyder | a7aea37 | 2009-04-23 16:17:54 -0700 | [diff] [blame] | 15 | * This driver instructs the DMA controller to issue the PCI Read Multiple |
| 16 | * command for PCI read operations, instead of using the default PCI Read Line |
| 17 | * command. Please be aware that this setting may result in read pre-fetching |
| 18 | * on some platforms. |
| 19 | * |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 20 | * This is free software; you can redistribute it and/or modify |
| 21 | * it under the terms of the GNU General Public License as published by |
| 22 | * the Free Software Foundation; either version 2 of the License, or |
| 23 | * (at your option) any later version. |
| 24 | * |
| 25 | */ |
| 26 | |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/pci.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 30 | #include <linux/slab.h> |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/dmaengine.h> |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/dma-mapping.h> |
| 35 | #include <linux/dmapool.h> |
| 36 | #include <linux/of_platform.h> |
| 37 | |
| 38 | #include "fsldma.h" |
| 39 | |
Ira Snyder | c1433041 | 2010-09-30 11:46:45 +0000 | [diff] [blame] | 40 | static const char msg_ld_oom[] = "No free memory for link descriptor\n"; |
| 41 | |
Ira Snyder | e8bd84d | 2011-03-03 07:54:54 +0000 | [diff] [blame^] | 42 | /* |
| 43 | * Register Helpers |
| 44 | */ |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 45 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 46 | static void set_sr(struct fsldma_chan *chan, u32 val) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 47 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 48 | DMA_OUT(chan, &chan->regs->sr, val, 32); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 49 | } |
| 50 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 51 | static u32 get_sr(struct fsldma_chan *chan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 52 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 53 | return DMA_IN(chan, &chan->regs->sr, 32); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 54 | } |
| 55 | |
Ira Snyder | e8bd84d | 2011-03-03 07:54:54 +0000 | [diff] [blame^] | 56 | static void set_cdar(struct fsldma_chan *chan, dma_addr_t addr) |
| 57 | { |
| 58 | DMA_OUT(chan, &chan->regs->cdar, addr | FSL_DMA_SNEN, 64); |
| 59 | } |
| 60 | |
| 61 | static dma_addr_t get_cdar(struct fsldma_chan *chan) |
| 62 | { |
| 63 | return DMA_IN(chan, &chan->regs->cdar, 64) & ~FSL_DMA_SNEN; |
| 64 | } |
| 65 | |
| 66 | static dma_addr_t get_ndar(struct fsldma_chan *chan) |
| 67 | { |
| 68 | return DMA_IN(chan, &chan->regs->ndar, 64); |
| 69 | } |
| 70 | |
| 71 | static u32 get_bcr(struct fsldma_chan *chan) |
| 72 | { |
| 73 | return DMA_IN(chan, &chan->regs->bcr, 32); |
| 74 | } |
| 75 | |
| 76 | /* |
| 77 | * Descriptor Helpers |
| 78 | */ |
| 79 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 80 | static void set_desc_cnt(struct fsldma_chan *chan, |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 81 | struct fsl_dma_ld_hw *hw, u32 count) |
| 82 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 83 | hw->count = CPU_TO_DMA(chan, count, 32); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 84 | } |
| 85 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 86 | static void set_desc_src(struct fsldma_chan *chan, |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 87 | struct fsl_dma_ld_hw *hw, dma_addr_t src) |
| 88 | { |
| 89 | u64 snoop_bits; |
| 90 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 91 | snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 92 | ? ((u64)FSL_DMA_SATR_SREADTYPE_SNOOP_READ << 32) : 0; |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 93 | hw->src_addr = CPU_TO_DMA(chan, snoop_bits | src, 64); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 94 | } |
| 95 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 96 | static void set_desc_dst(struct fsldma_chan *chan, |
Ira Snyder | 738f5f7 | 2010-01-06 13:34:02 +0000 | [diff] [blame] | 97 | struct fsl_dma_ld_hw *hw, dma_addr_t dst) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 98 | { |
| 99 | u64 snoop_bits; |
| 100 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 101 | snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 102 | ? ((u64)FSL_DMA_DATR_DWRITETYPE_SNOOP_WRITE << 32) : 0; |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 103 | hw->dst_addr = CPU_TO_DMA(chan, snoop_bits | dst, 64); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 104 | } |
| 105 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 106 | static void set_desc_next(struct fsldma_chan *chan, |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 107 | struct fsl_dma_ld_hw *hw, dma_addr_t next) |
| 108 | { |
| 109 | u64 snoop_bits; |
| 110 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 111 | snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_83XX) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 112 | ? FSL_DMA_SNEN : 0; |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 113 | hw->next_ln_addr = CPU_TO_DMA(chan, snoop_bits | next, 64); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 114 | } |
| 115 | |
Ira Snyder | e8bd84d | 2011-03-03 07:54:54 +0000 | [diff] [blame^] | 116 | static void set_ld_eol(struct fsldma_chan *chan, |
| 117 | struct fsl_desc_sw *desc) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 118 | { |
Ira Snyder | e8bd84d | 2011-03-03 07:54:54 +0000 | [diff] [blame^] | 119 | u64 snoop_bits; |
| 120 | |
| 121 | snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_83XX) |
| 122 | ? FSL_DMA_SNEN : 0; |
| 123 | |
| 124 | desc->hw.next_ln_addr = CPU_TO_DMA(chan, |
| 125 | DMA_TO_CPU(chan, desc->hw.next_ln_addr, 64) | FSL_DMA_EOL |
| 126 | | snoop_bits, 64); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 127 | } |
| 128 | |
Ira Snyder | e8bd84d | 2011-03-03 07:54:54 +0000 | [diff] [blame^] | 129 | /* |
| 130 | * DMA Engine Hardware Control Helpers |
| 131 | */ |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 132 | |
Ira Snyder | e8bd84d | 2011-03-03 07:54:54 +0000 | [diff] [blame^] | 133 | static void dma_init(struct fsldma_chan *chan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 134 | { |
Ira Snyder | e8bd84d | 2011-03-03 07:54:54 +0000 | [diff] [blame^] | 135 | /* Reset the channel */ |
| 136 | DMA_OUT(chan, &chan->regs->mr, 0, 32); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 137 | |
Ira Snyder | e8bd84d | 2011-03-03 07:54:54 +0000 | [diff] [blame^] | 138 | switch (chan->feature & FSL_DMA_IP_MASK) { |
| 139 | case FSL_DMA_IP_85XX: |
| 140 | /* Set the channel to below modes: |
| 141 | * EIE - Error interrupt enable |
| 142 | * EOSIE - End of segments interrupt enable (basic mode) |
| 143 | * EOLNIE - End of links interrupt enable |
| 144 | * BWC - Bandwidth sharing among channels |
| 145 | */ |
| 146 | DMA_OUT(chan, &chan->regs->mr, FSL_DMA_MR_BWC |
| 147 | | FSL_DMA_MR_EIE | FSL_DMA_MR_EOLNIE |
| 148 | | FSL_DMA_MR_EOSIE, 32); |
| 149 | break; |
| 150 | case FSL_DMA_IP_83XX: |
| 151 | /* Set the channel to below modes: |
| 152 | * EOTIE - End-of-transfer interrupt enable |
| 153 | * PRC_RM - PCI read multiple |
| 154 | */ |
| 155 | DMA_OUT(chan, &chan->regs->mr, FSL_DMA_MR_EOTIE |
| 156 | | FSL_DMA_MR_PRC_RM, 32); |
| 157 | break; |
| 158 | } |
Zhang Wei | f79abb6 | 2008-03-18 18:45:00 -0700 | [diff] [blame] | 159 | } |
| 160 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 161 | static int dma_is_idle(struct fsldma_chan *chan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 162 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 163 | u32 sr = get_sr(chan); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 164 | return (!(sr & FSL_DMA_SR_CB)) || (sr & FSL_DMA_SR_CH); |
| 165 | } |
| 166 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 167 | static void dma_start(struct fsldma_chan *chan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 168 | { |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 169 | u32 mode; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 170 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 171 | mode = DMA_IN(chan, &chan->regs->mr, 32); |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 172 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 173 | if ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) { |
| 174 | if (chan->feature & FSL_DMA_CHAN_PAUSE_EXT) { |
| 175 | DMA_OUT(chan, &chan->regs->bcr, 0, 32); |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 176 | mode |= FSL_DMA_MR_EMP_EN; |
| 177 | } else { |
| 178 | mode &= ~FSL_DMA_MR_EMP_EN; |
| 179 | } |
Ira Snyder | 43a1a3e | 2009-05-28 09:26:40 +0000 | [diff] [blame] | 180 | } |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 181 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 182 | if (chan->feature & FSL_DMA_CHAN_START_EXT) |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 183 | mode |= FSL_DMA_MR_EMS_EN; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 184 | else |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 185 | mode |= FSL_DMA_MR_CS; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 186 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 187 | DMA_OUT(chan, &chan->regs->mr, mode, 32); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 188 | } |
| 189 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 190 | static void dma_halt(struct fsldma_chan *chan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 191 | { |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 192 | u32 mode; |
Dan Williams | 900325a | 2009-03-02 15:33:46 -0700 | [diff] [blame] | 193 | int i; |
| 194 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 195 | mode = DMA_IN(chan, &chan->regs->mr, 32); |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 196 | mode |= FSL_DMA_MR_CA; |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 197 | DMA_OUT(chan, &chan->regs->mr, mode, 32); |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 198 | |
| 199 | mode &= ~(FSL_DMA_MR_CS | FSL_DMA_MR_EMS_EN | FSL_DMA_MR_CA); |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 200 | DMA_OUT(chan, &chan->regs->mr, mode, 32); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 201 | |
Dan Williams | 900325a | 2009-03-02 15:33:46 -0700 | [diff] [blame] | 202 | for (i = 0; i < 100; i++) { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 203 | if (dma_is_idle(chan)) |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 204 | return; |
| 205 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 206 | udelay(10); |
Dan Williams | 900325a | 2009-03-02 15:33:46 -0700 | [diff] [blame] | 207 | } |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 208 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 209 | if (!dma_is_idle(chan)) |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 210 | dev_err(chan->dev, "DMA halt timeout!\n"); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 211 | } |
| 212 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 213 | /** |
| 214 | * fsl_chan_set_src_loop_size - Set source address hold transfer size |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 215 | * @chan : Freescale DMA channel |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 216 | * @size : Address loop size, 0 for disable loop |
| 217 | * |
| 218 | * The set source address hold transfer size. The source |
| 219 | * address hold or loop transfer size is when the DMA transfer |
| 220 | * data from source address (SA), if the loop size is 4, the DMA will |
| 221 | * read data from SA, SA + 1, SA + 2, SA + 3, then loop back to SA, |
| 222 | * SA + 1 ... and so on. |
| 223 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 224 | static void fsl_chan_set_src_loop_size(struct fsldma_chan *chan, int size) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 225 | { |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 226 | u32 mode; |
| 227 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 228 | mode = DMA_IN(chan, &chan->regs->mr, 32); |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 229 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 230 | switch (size) { |
| 231 | case 0: |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 232 | mode &= ~FSL_DMA_MR_SAHE; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 233 | break; |
| 234 | case 1: |
| 235 | case 2: |
| 236 | case 4: |
| 237 | case 8: |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 238 | mode |= FSL_DMA_MR_SAHE | (__ilog2(size) << 14); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 239 | break; |
| 240 | } |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 241 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 242 | DMA_OUT(chan, &chan->regs->mr, mode, 32); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 243 | } |
| 244 | |
| 245 | /** |
Ira Snyder | 738f5f7 | 2010-01-06 13:34:02 +0000 | [diff] [blame] | 246 | * fsl_chan_set_dst_loop_size - Set destination address hold transfer size |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 247 | * @chan : Freescale DMA channel |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 248 | * @size : Address loop size, 0 for disable loop |
| 249 | * |
| 250 | * The set destination address hold transfer size. The destination |
| 251 | * address hold or loop transfer size is when the DMA transfer |
| 252 | * data to destination address (TA), if the loop size is 4, the DMA will |
| 253 | * write data to TA, TA + 1, TA + 2, TA + 3, then loop back to TA, |
| 254 | * TA + 1 ... and so on. |
| 255 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 256 | static void fsl_chan_set_dst_loop_size(struct fsldma_chan *chan, int size) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 257 | { |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 258 | u32 mode; |
| 259 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 260 | mode = DMA_IN(chan, &chan->regs->mr, 32); |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 261 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 262 | switch (size) { |
| 263 | case 0: |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 264 | mode &= ~FSL_DMA_MR_DAHE; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 265 | break; |
| 266 | case 1: |
| 267 | case 2: |
| 268 | case 4: |
| 269 | case 8: |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 270 | mode |= FSL_DMA_MR_DAHE | (__ilog2(size) << 16); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 271 | break; |
| 272 | } |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 273 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 274 | DMA_OUT(chan, &chan->regs->mr, mode, 32); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 275 | } |
| 276 | |
| 277 | /** |
Ira Snyder | e6c7ecb | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 278 | * fsl_chan_set_request_count - Set DMA Request Count for external control |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 279 | * @chan : Freescale DMA channel |
Ira Snyder | e6c7ecb | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 280 | * @size : Number of bytes to transfer in a single request |
| 281 | * |
| 282 | * The Freescale DMA channel can be controlled by the external signal DREQ#. |
| 283 | * The DMA request count is how many bytes are allowed to transfer before |
| 284 | * pausing the channel, after which a new assertion of DREQ# resumes channel |
| 285 | * operation. |
| 286 | * |
| 287 | * A size of 0 disables external pause control. The maximum size is 1024. |
| 288 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 289 | static void fsl_chan_set_request_count(struct fsldma_chan *chan, int size) |
Ira Snyder | e6c7ecb | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 290 | { |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 291 | u32 mode; |
| 292 | |
Ira Snyder | e6c7ecb | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 293 | BUG_ON(size > 1024); |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 294 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 295 | mode = DMA_IN(chan, &chan->regs->mr, 32); |
Ira Snyder | 272ca65 | 2010-01-06 13:33:59 +0000 | [diff] [blame] | 296 | mode |= (__ilog2(size) << 24) & 0x0f000000; |
| 297 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 298 | DMA_OUT(chan, &chan->regs->mr, mode, 32); |
Ira Snyder | e6c7ecb | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | /** |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 302 | * fsl_chan_toggle_ext_pause - Toggle channel external pause status |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 303 | * @chan : Freescale DMA channel |
Ira Snyder | e6c7ecb | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 304 | * @enable : 0 is disabled, 1 is enabled. |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 305 | * |
Ira Snyder | e6c7ecb | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 306 | * The Freescale DMA channel can be controlled by the external signal DREQ#. |
| 307 | * The DMA Request Count feature should be used in addition to this feature |
| 308 | * to set the number of bytes to transfer before pausing the channel. |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 309 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 310 | static void fsl_chan_toggle_ext_pause(struct fsldma_chan *chan, int enable) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 311 | { |
Ira Snyder | e6c7ecb | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 312 | if (enable) |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 313 | chan->feature |= FSL_DMA_CHAN_PAUSE_EXT; |
Ira Snyder | e6c7ecb | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 314 | else |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 315 | chan->feature &= ~FSL_DMA_CHAN_PAUSE_EXT; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 316 | } |
| 317 | |
| 318 | /** |
| 319 | * fsl_chan_toggle_ext_start - Toggle channel external start status |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 320 | * @chan : Freescale DMA channel |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 321 | * @enable : 0 is disabled, 1 is enabled. |
| 322 | * |
| 323 | * If enable the external start, the channel can be started by an |
| 324 | * external DMA start pin. So the dma_start() does not start the |
| 325 | * transfer immediately. The DMA channel will wait for the |
| 326 | * control pin asserted. |
| 327 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 328 | static void fsl_chan_toggle_ext_start(struct fsldma_chan *chan, int enable) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 329 | { |
| 330 | if (enable) |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 331 | chan->feature |= FSL_DMA_CHAN_START_EXT; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 332 | else |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 333 | chan->feature &= ~FSL_DMA_CHAN_START_EXT; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 334 | } |
| 335 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 336 | static void append_ld_queue(struct fsldma_chan *chan, |
| 337 | struct fsl_desc_sw *desc) |
| 338 | { |
| 339 | struct fsl_desc_sw *tail = to_fsl_desc(chan->ld_pending.prev); |
| 340 | |
| 341 | if (list_empty(&chan->ld_pending)) |
| 342 | goto out_splice; |
| 343 | |
| 344 | /* |
| 345 | * Add the hardware descriptor to the chain of hardware descriptors |
| 346 | * that already exists in memory. |
| 347 | * |
| 348 | * This will un-set the EOL bit of the existing transaction, and the |
| 349 | * last link in this transaction will become the EOL descriptor. |
| 350 | */ |
| 351 | set_desc_next(chan, &tail->hw, desc->async_tx.phys); |
| 352 | |
| 353 | /* |
| 354 | * Add the software descriptor and all children to the list |
| 355 | * of pending transactions |
| 356 | */ |
| 357 | out_splice: |
| 358 | list_splice_tail_init(&desc->tx_list, &chan->ld_pending); |
| 359 | } |
| 360 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 361 | static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx) |
| 362 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 363 | struct fsldma_chan *chan = to_fsl_chan(tx->chan); |
Dan Williams | eda3423 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 364 | struct fsl_desc_sw *desc = tx_to_fsl_desc(tx); |
| 365 | struct fsl_desc_sw *child; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 366 | unsigned long flags; |
| 367 | dma_cookie_t cookie; |
| 368 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 369 | spin_lock_irqsave(&chan->desc_lock, flags); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 370 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 371 | /* |
| 372 | * assign cookies to all of the software descriptors |
| 373 | * that make up this transaction |
| 374 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 375 | cookie = chan->common.cookie; |
Dan Williams | eda3423 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 376 | list_for_each_entry(child, &desc->tx_list, node) { |
Ira Snyder | bcfb746 | 2009-05-15 14:27:16 -0700 | [diff] [blame] | 377 | cookie++; |
| 378 | if (cookie < 0) |
| 379 | cookie = 1; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 380 | |
Steven J. Magnani | 6ca3a7a | 2010-02-25 13:39:30 -0600 | [diff] [blame] | 381 | child->async_tx.cookie = cookie; |
Ira Snyder | bcfb746 | 2009-05-15 14:27:16 -0700 | [diff] [blame] | 382 | } |
| 383 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 384 | chan->common.cookie = cookie; |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 385 | |
| 386 | /* put this transaction onto the tail of the pending queue */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 387 | append_ld_queue(chan, desc); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 388 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 389 | spin_unlock_irqrestore(&chan->desc_lock, flags); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 390 | |
| 391 | return cookie; |
| 392 | } |
| 393 | |
| 394 | /** |
| 395 | * fsl_dma_alloc_descriptor - Allocate descriptor from channel's DMA pool. |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 396 | * @chan : Freescale DMA channel |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 397 | * |
| 398 | * Return - The descriptor allocated. NULL for failed. |
| 399 | */ |
| 400 | static struct fsl_desc_sw *fsl_dma_alloc_descriptor( |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 401 | struct fsldma_chan *chan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 402 | { |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 403 | struct fsl_desc_sw *desc; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 404 | dma_addr_t pdesc; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 405 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 406 | desc = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &pdesc); |
| 407 | if (!desc) { |
| 408 | dev_dbg(chan->dev, "out of memory for link desc\n"); |
| 409 | return NULL; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 410 | } |
| 411 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 412 | memset(desc, 0, sizeof(*desc)); |
| 413 | INIT_LIST_HEAD(&desc->tx_list); |
| 414 | dma_async_tx_descriptor_init(&desc->async_tx, &chan->common); |
| 415 | desc->async_tx.tx_submit = fsl_dma_tx_submit; |
| 416 | desc->async_tx.phys = pdesc; |
| 417 | |
| 418 | return desc; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | |
| 422 | /** |
| 423 | * fsl_dma_alloc_chan_resources - Allocate resources for DMA channel. |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 424 | * @chan : Freescale DMA channel |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 425 | * |
| 426 | * This function will create a dma pool for descriptor allocation. |
| 427 | * |
| 428 | * Return - The number of descriptors allocated. |
| 429 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 430 | static int fsl_dma_alloc_chan_resources(struct dma_chan *dchan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 431 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 432 | struct fsldma_chan *chan = to_fsl_chan(dchan); |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 433 | |
| 434 | /* Has this channel already been allocated? */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 435 | if (chan->desc_pool) |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 436 | return 1; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 437 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 438 | /* |
| 439 | * We need the descriptor to be aligned to 32bytes |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 440 | * for meeting FSL DMA specification requirement. |
| 441 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 442 | chan->desc_pool = dma_pool_create("fsl_dma_engine_desc_pool", |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 443 | chan->dev, |
| 444 | sizeof(struct fsl_desc_sw), |
| 445 | __alignof__(struct fsl_desc_sw), 0); |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 446 | if (!chan->desc_pool) { |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 447 | dev_err(chan->dev, "unable to allocate channel %d " |
| 448 | "descriptor pool\n", chan->id); |
| 449 | return -ENOMEM; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 450 | } |
| 451 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 452 | /* there is at least one descriptor free to be allocated */ |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 453 | return 1; |
| 454 | } |
| 455 | |
| 456 | /** |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 457 | * fsldma_free_desc_list - Free all descriptors in a queue |
| 458 | * @chan: Freescae DMA channel |
| 459 | * @list: the list to free |
| 460 | * |
| 461 | * LOCKING: must hold chan->desc_lock |
| 462 | */ |
| 463 | static void fsldma_free_desc_list(struct fsldma_chan *chan, |
| 464 | struct list_head *list) |
| 465 | { |
| 466 | struct fsl_desc_sw *desc, *_desc; |
| 467 | |
| 468 | list_for_each_entry_safe(desc, _desc, list, node) { |
| 469 | list_del(&desc->node); |
| 470 | dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys); |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | static void fsldma_free_desc_list_reverse(struct fsldma_chan *chan, |
| 475 | struct list_head *list) |
| 476 | { |
| 477 | struct fsl_desc_sw *desc, *_desc; |
| 478 | |
| 479 | list_for_each_entry_safe_reverse(desc, _desc, list, node) { |
| 480 | list_del(&desc->node); |
| 481 | dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys); |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | /** |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 486 | * fsl_dma_free_chan_resources - Free all resources of the channel. |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 487 | * @chan : Freescale DMA channel |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 488 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 489 | static void fsl_dma_free_chan_resources(struct dma_chan *dchan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 490 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 491 | struct fsldma_chan *chan = to_fsl_chan(dchan); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 492 | unsigned long flags; |
| 493 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 494 | dev_dbg(chan->dev, "Free all channel resources.\n"); |
| 495 | spin_lock_irqsave(&chan->desc_lock, flags); |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 496 | fsldma_free_desc_list(chan, &chan->ld_pending); |
| 497 | fsldma_free_desc_list(chan, &chan->ld_running); |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 498 | spin_unlock_irqrestore(&chan->desc_lock, flags); |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 499 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 500 | dma_pool_destroy(chan->desc_pool); |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 501 | chan->desc_pool = NULL; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 502 | } |
| 503 | |
Zhang Wei | 2187c26 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 504 | static struct dma_async_tx_descriptor * |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 505 | fsl_dma_prep_interrupt(struct dma_chan *dchan, unsigned long flags) |
Zhang Wei | 2187c26 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 506 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 507 | struct fsldma_chan *chan; |
Zhang Wei | 2187c26 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 508 | struct fsl_desc_sw *new; |
| 509 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 510 | if (!dchan) |
Zhang Wei | 2187c26 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 511 | return NULL; |
| 512 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 513 | chan = to_fsl_chan(dchan); |
Zhang Wei | 2187c26 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 514 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 515 | new = fsl_dma_alloc_descriptor(chan); |
Zhang Wei | 2187c26 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 516 | if (!new) { |
Ira Snyder | c1433041 | 2010-09-30 11:46:45 +0000 | [diff] [blame] | 517 | dev_err(chan->dev, msg_ld_oom); |
Zhang Wei | 2187c26 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 518 | return NULL; |
| 519 | } |
| 520 | |
| 521 | new->async_tx.cookie = -EBUSY; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 522 | new->async_tx.flags = flags; |
Zhang Wei | 2187c26 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 523 | |
Zhang Wei | f79abb6 | 2008-03-18 18:45:00 -0700 | [diff] [blame] | 524 | /* Insert the link descriptor to the LD ring */ |
Dan Williams | eda3423 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 525 | list_add_tail(&new->node, &new->tx_list); |
Zhang Wei | f79abb6 | 2008-03-18 18:45:00 -0700 | [diff] [blame] | 526 | |
Zhang Wei | 2187c26 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 527 | /* Set End-of-link to the last link descriptor of new list*/ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 528 | set_ld_eol(chan, new); |
Zhang Wei | 2187c26 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 529 | |
| 530 | return &new->async_tx; |
| 531 | } |
| 532 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 533 | static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy( |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 534 | struct dma_chan *dchan, dma_addr_t dma_dst, dma_addr_t dma_src, |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 535 | size_t len, unsigned long flags) |
| 536 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 537 | struct fsldma_chan *chan; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 538 | struct fsl_desc_sw *first = NULL, *prev = NULL, *new; |
| 539 | size_t copy; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 540 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 541 | if (!dchan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 542 | return NULL; |
| 543 | |
| 544 | if (!len) |
| 545 | return NULL; |
| 546 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 547 | chan = to_fsl_chan(dchan); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 548 | |
| 549 | do { |
| 550 | |
| 551 | /* Allocate the link descriptor from DMA pool */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 552 | new = fsl_dma_alloc_descriptor(chan); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 553 | if (!new) { |
Ira Snyder | c1433041 | 2010-09-30 11:46:45 +0000 | [diff] [blame] | 554 | dev_err(chan->dev, msg_ld_oom); |
Ira Snyder | 2e077f8 | 2009-05-15 09:59:46 -0700 | [diff] [blame] | 555 | goto fail; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 556 | } |
| 557 | #ifdef FSL_DMA_LD_DEBUG |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 558 | dev_dbg(chan->dev, "new link desc alloc %p\n", new); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 559 | #endif |
| 560 | |
Zhang Wei | 5682284 | 2008-03-13 10:45:27 -0700 | [diff] [blame] | 561 | copy = min(len, (size_t)FSL_DMA_BCR_MAX_CNT); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 562 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 563 | set_desc_cnt(chan, &new->hw, copy); |
| 564 | set_desc_src(chan, &new->hw, dma_src); |
| 565 | set_desc_dst(chan, &new->hw, dma_dst); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 566 | |
| 567 | if (!first) |
| 568 | first = new; |
| 569 | else |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 570 | set_desc_next(chan, &prev->hw, new->async_tx.phys); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 571 | |
| 572 | new->async_tx.cookie = 0; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 573 | async_tx_ack(&new->async_tx); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 574 | |
| 575 | prev = new; |
| 576 | len -= copy; |
| 577 | dma_src += copy; |
Ira Snyder | 738f5f7 | 2010-01-06 13:34:02 +0000 | [diff] [blame] | 578 | dma_dst += copy; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 579 | |
| 580 | /* Insert the link descriptor to the LD ring */ |
Dan Williams | eda3423 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 581 | list_add_tail(&new->node, &first->tx_list); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 582 | } while (len); |
| 583 | |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 584 | new->async_tx.flags = flags; /* client is in control of this ack */ |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 585 | new->async_tx.cookie = -EBUSY; |
| 586 | |
| 587 | /* Set End-of-link to the last link descriptor of new list*/ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 588 | set_ld_eol(chan, new); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 589 | |
Ira Snyder | 2e077f8 | 2009-05-15 09:59:46 -0700 | [diff] [blame] | 590 | return &first->async_tx; |
| 591 | |
| 592 | fail: |
| 593 | if (!first) |
| 594 | return NULL; |
| 595 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 596 | fsldma_free_desc_list_reverse(chan, &first->tx_list); |
Ira Snyder | 2e077f8 | 2009-05-15 09:59:46 -0700 | [diff] [blame] | 597 | return NULL; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 598 | } |
| 599 | |
Ira Snyder | c1433041 | 2010-09-30 11:46:45 +0000 | [diff] [blame] | 600 | static struct dma_async_tx_descriptor *fsl_dma_prep_sg(struct dma_chan *dchan, |
| 601 | struct scatterlist *dst_sg, unsigned int dst_nents, |
| 602 | struct scatterlist *src_sg, unsigned int src_nents, |
| 603 | unsigned long flags) |
| 604 | { |
| 605 | struct fsl_desc_sw *first = NULL, *prev = NULL, *new = NULL; |
| 606 | struct fsldma_chan *chan = to_fsl_chan(dchan); |
| 607 | size_t dst_avail, src_avail; |
| 608 | dma_addr_t dst, src; |
| 609 | size_t len; |
| 610 | |
| 611 | /* basic sanity checks */ |
| 612 | if (dst_nents == 0 || src_nents == 0) |
| 613 | return NULL; |
| 614 | |
| 615 | if (dst_sg == NULL || src_sg == NULL) |
| 616 | return NULL; |
| 617 | |
| 618 | /* |
| 619 | * TODO: should we check that both scatterlists have the same |
| 620 | * TODO: number of bytes in total? Is that really an error? |
| 621 | */ |
| 622 | |
| 623 | /* get prepared for the loop */ |
| 624 | dst_avail = sg_dma_len(dst_sg); |
| 625 | src_avail = sg_dma_len(src_sg); |
| 626 | |
| 627 | /* run until we are out of scatterlist entries */ |
| 628 | while (true) { |
| 629 | |
| 630 | /* create the largest transaction possible */ |
| 631 | len = min_t(size_t, src_avail, dst_avail); |
| 632 | len = min_t(size_t, len, FSL_DMA_BCR_MAX_CNT); |
| 633 | if (len == 0) |
| 634 | goto fetch; |
| 635 | |
| 636 | dst = sg_dma_address(dst_sg) + sg_dma_len(dst_sg) - dst_avail; |
| 637 | src = sg_dma_address(src_sg) + sg_dma_len(src_sg) - src_avail; |
| 638 | |
| 639 | /* allocate and populate the descriptor */ |
| 640 | new = fsl_dma_alloc_descriptor(chan); |
| 641 | if (!new) { |
| 642 | dev_err(chan->dev, msg_ld_oom); |
| 643 | goto fail; |
| 644 | } |
| 645 | #ifdef FSL_DMA_LD_DEBUG |
| 646 | dev_dbg(chan->dev, "new link desc alloc %p\n", new); |
| 647 | #endif |
| 648 | |
| 649 | set_desc_cnt(chan, &new->hw, len); |
| 650 | set_desc_src(chan, &new->hw, src); |
| 651 | set_desc_dst(chan, &new->hw, dst); |
| 652 | |
| 653 | if (!first) |
| 654 | first = new; |
| 655 | else |
| 656 | set_desc_next(chan, &prev->hw, new->async_tx.phys); |
| 657 | |
| 658 | new->async_tx.cookie = 0; |
| 659 | async_tx_ack(&new->async_tx); |
| 660 | prev = new; |
| 661 | |
| 662 | /* Insert the link descriptor to the LD ring */ |
| 663 | list_add_tail(&new->node, &first->tx_list); |
| 664 | |
| 665 | /* update metadata */ |
| 666 | dst_avail -= len; |
| 667 | src_avail -= len; |
| 668 | |
| 669 | fetch: |
| 670 | /* fetch the next dst scatterlist entry */ |
| 671 | if (dst_avail == 0) { |
| 672 | |
| 673 | /* no more entries: we're done */ |
| 674 | if (dst_nents == 0) |
| 675 | break; |
| 676 | |
| 677 | /* fetch the next entry: if there are no more: done */ |
| 678 | dst_sg = sg_next(dst_sg); |
| 679 | if (dst_sg == NULL) |
| 680 | break; |
| 681 | |
| 682 | dst_nents--; |
| 683 | dst_avail = sg_dma_len(dst_sg); |
| 684 | } |
| 685 | |
| 686 | /* fetch the next src scatterlist entry */ |
| 687 | if (src_avail == 0) { |
| 688 | |
| 689 | /* no more entries: we're done */ |
| 690 | if (src_nents == 0) |
| 691 | break; |
| 692 | |
| 693 | /* fetch the next entry: if there are no more: done */ |
| 694 | src_sg = sg_next(src_sg); |
| 695 | if (src_sg == NULL) |
| 696 | break; |
| 697 | |
| 698 | src_nents--; |
| 699 | src_avail = sg_dma_len(src_sg); |
| 700 | } |
| 701 | } |
| 702 | |
| 703 | new->async_tx.flags = flags; /* client is in control of this ack */ |
| 704 | new->async_tx.cookie = -EBUSY; |
| 705 | |
| 706 | /* Set End-of-link to the last link descriptor of new list */ |
| 707 | set_ld_eol(chan, new); |
| 708 | |
| 709 | return &first->async_tx; |
| 710 | |
| 711 | fail: |
| 712 | if (!first) |
| 713 | return NULL; |
| 714 | |
| 715 | fsldma_free_desc_list_reverse(chan, &first->tx_list); |
| 716 | return NULL; |
| 717 | } |
| 718 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 719 | /** |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 720 | * fsl_dma_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction |
| 721 | * @chan: DMA channel |
| 722 | * @sgl: scatterlist to transfer to/from |
| 723 | * @sg_len: number of entries in @scatterlist |
| 724 | * @direction: DMA direction |
| 725 | * @flags: DMAEngine flags |
| 726 | * |
| 727 | * Prepare a set of descriptors for a DMA_SLAVE transaction. Following the |
| 728 | * DMA_SLAVE API, this gets the device-specific information from the |
| 729 | * chan->private variable. |
| 730 | */ |
| 731 | static struct dma_async_tx_descriptor *fsl_dma_prep_slave_sg( |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 732 | struct dma_chan *dchan, struct scatterlist *sgl, unsigned int sg_len, |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 733 | enum dma_data_direction direction, unsigned long flags) |
| 734 | { |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 735 | /* |
Ira Snyder | 968f19a | 2010-09-30 11:46:46 +0000 | [diff] [blame] | 736 | * This operation is not supported on the Freescale DMA controller |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 737 | * |
Ira Snyder | 968f19a | 2010-09-30 11:46:46 +0000 | [diff] [blame] | 738 | * However, we need to provide the function pointer to allow the |
| 739 | * device_control() method to work. |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 740 | */ |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 741 | return NULL; |
| 742 | } |
| 743 | |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 744 | static int fsl_dma_device_control(struct dma_chan *dchan, |
Linus Walleij | 0582763 | 2010-05-17 16:30:42 -0700 | [diff] [blame] | 745 | enum dma_ctrl_cmd cmd, unsigned long arg) |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 746 | { |
Ira Snyder | 968f19a | 2010-09-30 11:46:46 +0000 | [diff] [blame] | 747 | struct dma_slave_config *config; |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 748 | struct fsldma_chan *chan; |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 749 | unsigned long flags; |
Ira Snyder | 968f19a | 2010-09-30 11:46:46 +0000 | [diff] [blame] | 750 | int size; |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 751 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 752 | if (!dchan) |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 753 | return -EINVAL; |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 754 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 755 | chan = to_fsl_chan(dchan); |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 756 | |
Ira Snyder | 968f19a | 2010-09-30 11:46:46 +0000 | [diff] [blame] | 757 | switch (cmd) { |
| 758 | case DMA_TERMINATE_ALL: |
| 759 | /* Halt the DMA engine */ |
| 760 | dma_halt(chan); |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 761 | |
Ira Snyder | 968f19a | 2010-09-30 11:46:46 +0000 | [diff] [blame] | 762 | spin_lock_irqsave(&chan->desc_lock, flags); |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 763 | |
Ira Snyder | 968f19a | 2010-09-30 11:46:46 +0000 | [diff] [blame] | 764 | /* Remove and free all of the descriptors in the LD queue */ |
| 765 | fsldma_free_desc_list(chan, &chan->ld_pending); |
| 766 | fsldma_free_desc_list(chan, &chan->ld_running); |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 767 | |
Ira Snyder | 968f19a | 2010-09-30 11:46:46 +0000 | [diff] [blame] | 768 | spin_unlock_irqrestore(&chan->desc_lock, flags); |
| 769 | return 0; |
| 770 | |
| 771 | case DMA_SLAVE_CONFIG: |
| 772 | config = (struct dma_slave_config *)arg; |
| 773 | |
| 774 | /* make sure the channel supports setting burst size */ |
| 775 | if (!chan->set_request_count) |
| 776 | return -ENXIO; |
| 777 | |
| 778 | /* we set the controller burst size depending on direction */ |
| 779 | if (config->direction == DMA_TO_DEVICE) |
| 780 | size = config->dst_addr_width * config->dst_maxburst; |
| 781 | else |
| 782 | size = config->src_addr_width * config->src_maxburst; |
| 783 | |
| 784 | chan->set_request_count(chan, size); |
| 785 | return 0; |
| 786 | |
| 787 | case FSLDMA_EXTERNAL_START: |
| 788 | |
| 789 | /* make sure the channel supports external start */ |
| 790 | if (!chan->toggle_ext_start) |
| 791 | return -ENXIO; |
| 792 | |
| 793 | chan->toggle_ext_start(chan, arg); |
| 794 | return 0; |
| 795 | |
| 796 | default: |
| 797 | return -ENXIO; |
| 798 | } |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 799 | |
| 800 | return 0; |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 801 | } |
| 802 | |
| 803 | /** |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 804 | * fsl_dma_update_completed_cookie - Update the completed cookie. |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 805 | * @chan : Freescale DMA channel |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 806 | * |
| 807 | * CONTEXT: hardirq |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 808 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 809 | static void fsl_dma_update_completed_cookie(struct fsldma_chan *chan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 810 | { |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 811 | struct fsl_desc_sw *desc; |
| 812 | unsigned long flags; |
| 813 | dma_cookie_t cookie; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 814 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 815 | spin_lock_irqsave(&chan->desc_lock, flags); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 816 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 817 | if (list_empty(&chan->ld_running)) { |
| 818 | dev_dbg(chan->dev, "no running descriptors\n"); |
| 819 | goto out_unlock; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 820 | } |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 821 | |
| 822 | /* Get the last descriptor, update the cookie to that */ |
| 823 | desc = to_fsl_desc(chan->ld_running.prev); |
| 824 | if (dma_is_idle(chan)) |
| 825 | cookie = desc->async_tx.cookie; |
Steven J. Magnani | 76bd061 | 2010-02-28 22:18:16 -0700 | [diff] [blame] | 826 | else { |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 827 | cookie = desc->async_tx.cookie - 1; |
Steven J. Magnani | 76bd061 | 2010-02-28 22:18:16 -0700 | [diff] [blame] | 828 | if (unlikely(cookie < DMA_MIN_COOKIE)) |
| 829 | cookie = DMA_MAX_COOKIE; |
| 830 | } |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 831 | |
| 832 | chan->completed_cookie = cookie; |
| 833 | |
| 834 | out_unlock: |
| 835 | spin_unlock_irqrestore(&chan->desc_lock, flags); |
| 836 | } |
| 837 | |
| 838 | /** |
| 839 | * fsldma_desc_status - Check the status of a descriptor |
| 840 | * @chan: Freescale DMA channel |
| 841 | * @desc: DMA SW descriptor |
| 842 | * |
| 843 | * This function will return the status of the given descriptor |
| 844 | */ |
| 845 | static enum dma_status fsldma_desc_status(struct fsldma_chan *chan, |
| 846 | struct fsl_desc_sw *desc) |
| 847 | { |
| 848 | return dma_async_is_complete(desc->async_tx.cookie, |
| 849 | chan->completed_cookie, |
| 850 | chan->common.cookie); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 851 | } |
| 852 | |
| 853 | /** |
| 854 | * fsl_chan_ld_cleanup - Clean up link descriptors |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 855 | * @chan : Freescale DMA channel |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 856 | * |
| 857 | * This function clean up the ld_queue of DMA channel. |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 858 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 859 | static void fsl_chan_ld_cleanup(struct fsldma_chan *chan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 860 | { |
| 861 | struct fsl_desc_sw *desc, *_desc; |
| 862 | unsigned long flags; |
| 863 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 864 | spin_lock_irqsave(&chan->desc_lock, flags); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 865 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 866 | dev_dbg(chan->dev, "chan completed_cookie = %d\n", chan->completed_cookie); |
| 867 | list_for_each_entry_safe(desc, _desc, &chan->ld_running, node) { |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 868 | dma_async_tx_callback callback; |
| 869 | void *callback_param; |
| 870 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 871 | if (fsldma_desc_status(chan, desc) == DMA_IN_PROGRESS) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 872 | break; |
| 873 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 874 | /* Remove from the list of running transactions */ |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 875 | list_del(&desc->node); |
| 876 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 877 | /* Run the link descriptor callback function */ |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 878 | callback = desc->async_tx.callback; |
| 879 | callback_param = desc->async_tx.callback_param; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 880 | if (callback) { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 881 | spin_unlock_irqrestore(&chan->desc_lock, flags); |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 882 | dev_dbg(chan->dev, "LD %p callback\n", desc); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 883 | callback(callback_param); |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 884 | spin_lock_irqsave(&chan->desc_lock, flags); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 885 | } |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 886 | |
| 887 | /* Run any dependencies, then free the descriptor */ |
| 888 | dma_run_dependencies(&desc->async_tx); |
| 889 | dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 890 | } |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 891 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 892 | spin_unlock_irqrestore(&chan->desc_lock, flags); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 893 | } |
| 894 | |
| 895 | /** |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 896 | * fsl_chan_xfer_ld_queue - transfer any pending transactions |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 897 | * @chan : Freescale DMA channel |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 898 | * |
| 899 | * This will make sure that any pending transactions will be run. |
| 900 | * If the DMA controller is idle, it will be started. Otherwise, |
| 901 | * the DMA controller's interrupt handler will start any pending |
| 902 | * transactions when it becomes idle. |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 903 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 904 | static void fsl_chan_xfer_ld_queue(struct fsldma_chan *chan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 905 | { |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 906 | struct fsl_desc_sw *desc; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 907 | unsigned long flags; |
| 908 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 909 | spin_lock_irqsave(&chan->desc_lock, flags); |
Ira Snyder | 138ef01 | 2009-05-19 15:42:13 -0700 | [diff] [blame] | 910 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 911 | /* |
| 912 | * If the list of pending descriptors is empty, then we |
| 913 | * don't need to do any work at all |
| 914 | */ |
| 915 | if (list_empty(&chan->ld_pending)) { |
| 916 | dev_dbg(chan->dev, "no pending LDs\n"); |
Ira Snyder | 138ef01 | 2009-05-19 15:42:13 -0700 | [diff] [blame] | 917 | goto out_unlock; |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 918 | } |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 919 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 920 | /* |
| 921 | * The DMA controller is not idle, which means the interrupt |
| 922 | * handler will start any queued transactions when it runs |
| 923 | * at the end of the current transaction |
| 924 | */ |
| 925 | if (!dma_is_idle(chan)) { |
| 926 | dev_dbg(chan->dev, "DMA controller still busy\n"); |
| 927 | goto out_unlock; |
| 928 | } |
| 929 | |
| 930 | /* |
| 931 | * TODO: |
| 932 | * make sure the dma_halt() function really un-wedges the |
| 933 | * controller as much as possible |
| 934 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 935 | dma_halt(chan); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 936 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 937 | /* |
| 938 | * If there are some link descriptors which have not been |
| 939 | * transferred, we need to start the controller |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 940 | */ |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 941 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 942 | /* |
| 943 | * Move all elements from the queue of pending transactions |
| 944 | * onto the list of running transactions |
| 945 | */ |
| 946 | desc = list_first_entry(&chan->ld_pending, struct fsl_desc_sw, node); |
| 947 | list_splice_tail_init(&chan->ld_pending, &chan->ld_running); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 948 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 949 | /* |
| 950 | * Program the descriptor's address into the DMA controller, |
| 951 | * then start the DMA transaction |
| 952 | */ |
| 953 | set_cdar(chan, desc->async_tx.phys); |
| 954 | dma_start(chan); |
Ira Snyder | 138ef01 | 2009-05-19 15:42:13 -0700 | [diff] [blame] | 955 | |
| 956 | out_unlock: |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 957 | spin_unlock_irqrestore(&chan->desc_lock, flags); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 958 | } |
| 959 | |
| 960 | /** |
| 961 | * fsl_dma_memcpy_issue_pending - Issue the DMA start command |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 962 | * @chan : Freescale DMA channel |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 963 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 964 | static void fsl_dma_memcpy_issue_pending(struct dma_chan *dchan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 965 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 966 | struct fsldma_chan *chan = to_fsl_chan(dchan); |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 967 | fsl_chan_xfer_ld_queue(chan); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 968 | } |
| 969 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 970 | /** |
Linus Walleij | 0793448 | 2010-03-26 16:50:49 -0700 | [diff] [blame] | 971 | * fsl_tx_status - Determine the DMA status |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 972 | * @chan : Freescale DMA channel |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 973 | */ |
Linus Walleij | 0793448 | 2010-03-26 16:50:49 -0700 | [diff] [blame] | 974 | static enum dma_status fsl_tx_status(struct dma_chan *dchan, |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 975 | dma_cookie_t cookie, |
Linus Walleij | 0793448 | 2010-03-26 16:50:49 -0700 | [diff] [blame] | 976 | struct dma_tx_state *txstate) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 977 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 978 | struct fsldma_chan *chan = to_fsl_chan(dchan); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 979 | dma_cookie_t last_used; |
| 980 | dma_cookie_t last_complete; |
| 981 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 982 | fsl_chan_ld_cleanup(chan); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 983 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 984 | last_used = dchan->cookie; |
| 985 | last_complete = chan->completed_cookie; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 986 | |
Dan Williams | bca3469 | 2010-03-26 16:52:10 -0700 | [diff] [blame] | 987 | dma_set_tx_state(txstate, last_complete, last_used, 0); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 988 | |
| 989 | return dma_async_is_complete(cookie, last_complete, last_used); |
| 990 | } |
| 991 | |
Ira Snyder | d3f620b | 2010-01-06 13:34:04 +0000 | [diff] [blame] | 992 | /*----------------------------------------------------------------------------*/ |
| 993 | /* Interrupt Handling */ |
| 994 | /*----------------------------------------------------------------------------*/ |
| 995 | |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 996 | static irqreturn_t fsldma_chan_irq(int irq, void *data) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 997 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 998 | struct fsldma_chan *chan = data; |
Zhang Wei | 1c62979 | 2008-04-17 20:17:25 -0700 | [diff] [blame] | 999 | int update_cookie = 0; |
| 1000 | int xfer_ld_q = 0; |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1001 | u32 stat; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1002 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 1003 | /* save and clear the status register */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1004 | stat = get_sr(chan); |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 1005 | set_sr(chan, stat); |
| 1006 | dev_dbg(chan->dev, "irq: channel %d, stat = 0x%x\n", chan->id, stat); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1007 | |
| 1008 | stat &= ~(FSL_DMA_SR_CB | FSL_DMA_SR_CH); |
| 1009 | if (!stat) |
| 1010 | return IRQ_NONE; |
| 1011 | |
| 1012 | if (stat & FSL_DMA_SR_TE) |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1013 | dev_err(chan->dev, "Transfer Error!\n"); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1014 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 1015 | /* |
| 1016 | * Programming Error |
Zhang Wei | f79abb6 | 2008-03-18 18:45:00 -0700 | [diff] [blame] | 1017 | * The DMA_INTERRUPT async_tx is a NULL transfer, which will |
| 1018 | * triger a PE interrupt. |
| 1019 | */ |
| 1020 | if (stat & FSL_DMA_SR_PE) { |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 1021 | dev_dbg(chan->dev, "irq: Programming Error INT\n"); |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1022 | if (get_bcr(chan) == 0) { |
Zhang Wei | f79abb6 | 2008-03-18 18:45:00 -0700 | [diff] [blame] | 1023 | /* BCR register is 0, this is a DMA_INTERRUPT async_tx. |
| 1024 | * Now, update the completed cookie, and continue the |
| 1025 | * next uncompleted transfer. |
| 1026 | */ |
Zhang Wei | 1c62979 | 2008-04-17 20:17:25 -0700 | [diff] [blame] | 1027 | update_cookie = 1; |
| 1028 | xfer_ld_q = 1; |
Zhang Wei | f79abb6 | 2008-03-18 18:45:00 -0700 | [diff] [blame] | 1029 | } |
| 1030 | stat &= ~FSL_DMA_SR_PE; |
| 1031 | } |
| 1032 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 1033 | /* |
| 1034 | * If the link descriptor segment transfer finishes, |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1035 | * we will recycle the used descriptor. |
| 1036 | */ |
| 1037 | if (stat & FSL_DMA_SR_EOSI) { |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 1038 | dev_dbg(chan->dev, "irq: End-of-segments INT\n"); |
| 1039 | dev_dbg(chan->dev, "irq: clndar 0x%llx, nlndar 0x%llx\n", |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1040 | (unsigned long long)get_cdar(chan), |
| 1041 | (unsigned long long)get_ndar(chan)); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1042 | stat &= ~FSL_DMA_SR_EOSI; |
Zhang Wei | 1c62979 | 2008-04-17 20:17:25 -0700 | [diff] [blame] | 1043 | update_cookie = 1; |
| 1044 | } |
| 1045 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 1046 | /* |
| 1047 | * For MPC8349, EOCDI event need to update cookie |
Zhang Wei | 1c62979 | 2008-04-17 20:17:25 -0700 | [diff] [blame] | 1048 | * and start the next transfer if it exist. |
| 1049 | */ |
| 1050 | if (stat & FSL_DMA_SR_EOCDI) { |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 1051 | dev_dbg(chan->dev, "irq: End-of-Chain link INT\n"); |
Zhang Wei | 1c62979 | 2008-04-17 20:17:25 -0700 | [diff] [blame] | 1052 | stat &= ~FSL_DMA_SR_EOCDI; |
| 1053 | update_cookie = 1; |
| 1054 | xfer_ld_q = 1; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1055 | } |
| 1056 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 1057 | /* |
| 1058 | * If it current transfer is the end-of-transfer, |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1059 | * we should clear the Channel Start bit for |
| 1060 | * prepare next transfer. |
| 1061 | */ |
Zhang Wei | 1c62979 | 2008-04-17 20:17:25 -0700 | [diff] [blame] | 1062 | if (stat & FSL_DMA_SR_EOLNI) { |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 1063 | dev_dbg(chan->dev, "irq: End-of-link INT\n"); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1064 | stat &= ~FSL_DMA_SR_EOLNI; |
Zhang Wei | 1c62979 | 2008-04-17 20:17:25 -0700 | [diff] [blame] | 1065 | xfer_ld_q = 1; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1066 | } |
| 1067 | |
Zhang Wei | 1c62979 | 2008-04-17 20:17:25 -0700 | [diff] [blame] | 1068 | if (update_cookie) |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1069 | fsl_dma_update_completed_cookie(chan); |
Zhang Wei | 1c62979 | 2008-04-17 20:17:25 -0700 | [diff] [blame] | 1070 | if (xfer_ld_q) |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1071 | fsl_chan_xfer_ld_queue(chan); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1072 | if (stat) |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 1073 | dev_dbg(chan->dev, "irq: unhandled sr 0x%02x\n", stat); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1074 | |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 1075 | dev_dbg(chan->dev, "irq: Exit\n"); |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1076 | tasklet_schedule(&chan->tasklet); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1077 | return IRQ_HANDLED; |
| 1078 | } |
| 1079 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1080 | static void dma_do_tasklet(unsigned long data) |
| 1081 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1082 | struct fsldma_chan *chan = (struct fsldma_chan *)data; |
| 1083 | fsl_chan_ld_cleanup(chan); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1084 | } |
| 1085 | |
Ira Snyder | d3f620b | 2010-01-06 13:34:04 +0000 | [diff] [blame] | 1086 | static irqreturn_t fsldma_ctrl_irq(int irq, void *data) |
| 1087 | { |
| 1088 | struct fsldma_device *fdev = data; |
| 1089 | struct fsldma_chan *chan; |
| 1090 | unsigned int handled = 0; |
| 1091 | u32 gsr, mask; |
| 1092 | int i; |
| 1093 | |
| 1094 | gsr = (fdev->feature & FSL_DMA_BIG_ENDIAN) ? in_be32(fdev->regs) |
| 1095 | : in_le32(fdev->regs); |
| 1096 | mask = 0xff000000; |
| 1097 | dev_dbg(fdev->dev, "IRQ: gsr 0x%.8x\n", gsr); |
| 1098 | |
| 1099 | for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) { |
| 1100 | chan = fdev->chan[i]; |
| 1101 | if (!chan) |
| 1102 | continue; |
| 1103 | |
| 1104 | if (gsr & mask) { |
| 1105 | dev_dbg(fdev->dev, "IRQ: chan %d\n", chan->id); |
| 1106 | fsldma_chan_irq(irq, chan); |
| 1107 | handled++; |
| 1108 | } |
| 1109 | |
| 1110 | gsr &= ~mask; |
| 1111 | mask >>= 8; |
| 1112 | } |
| 1113 | |
| 1114 | return IRQ_RETVAL(handled); |
| 1115 | } |
| 1116 | |
| 1117 | static void fsldma_free_irqs(struct fsldma_device *fdev) |
| 1118 | { |
| 1119 | struct fsldma_chan *chan; |
| 1120 | int i; |
| 1121 | |
| 1122 | if (fdev->irq != NO_IRQ) { |
| 1123 | dev_dbg(fdev->dev, "free per-controller IRQ\n"); |
| 1124 | free_irq(fdev->irq, fdev); |
| 1125 | return; |
| 1126 | } |
| 1127 | |
| 1128 | for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) { |
| 1129 | chan = fdev->chan[i]; |
| 1130 | if (chan && chan->irq != NO_IRQ) { |
| 1131 | dev_dbg(fdev->dev, "free channel %d IRQ\n", chan->id); |
| 1132 | free_irq(chan->irq, chan); |
| 1133 | } |
| 1134 | } |
| 1135 | } |
| 1136 | |
| 1137 | static int fsldma_request_irqs(struct fsldma_device *fdev) |
| 1138 | { |
| 1139 | struct fsldma_chan *chan; |
| 1140 | int ret; |
| 1141 | int i; |
| 1142 | |
| 1143 | /* if we have a per-controller IRQ, use that */ |
| 1144 | if (fdev->irq != NO_IRQ) { |
| 1145 | dev_dbg(fdev->dev, "request per-controller IRQ\n"); |
| 1146 | ret = request_irq(fdev->irq, fsldma_ctrl_irq, IRQF_SHARED, |
| 1147 | "fsldma-controller", fdev); |
| 1148 | return ret; |
| 1149 | } |
| 1150 | |
| 1151 | /* no per-controller IRQ, use the per-channel IRQs */ |
| 1152 | for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) { |
| 1153 | chan = fdev->chan[i]; |
| 1154 | if (!chan) |
| 1155 | continue; |
| 1156 | |
| 1157 | if (chan->irq == NO_IRQ) { |
| 1158 | dev_err(fdev->dev, "no interrupts property defined for " |
| 1159 | "DMA channel %d. Please fix your " |
| 1160 | "device tree\n", chan->id); |
| 1161 | ret = -ENODEV; |
| 1162 | goto out_unwind; |
| 1163 | } |
| 1164 | |
| 1165 | dev_dbg(fdev->dev, "request channel %d IRQ\n", chan->id); |
| 1166 | ret = request_irq(chan->irq, fsldma_chan_irq, IRQF_SHARED, |
| 1167 | "fsldma-chan", chan); |
| 1168 | if (ret) { |
| 1169 | dev_err(fdev->dev, "unable to request IRQ for DMA " |
| 1170 | "channel %d\n", chan->id); |
| 1171 | goto out_unwind; |
| 1172 | } |
| 1173 | } |
| 1174 | |
| 1175 | return 0; |
| 1176 | |
| 1177 | out_unwind: |
| 1178 | for (/* none */; i >= 0; i--) { |
| 1179 | chan = fdev->chan[i]; |
| 1180 | if (!chan) |
| 1181 | continue; |
| 1182 | |
| 1183 | if (chan->irq == NO_IRQ) |
| 1184 | continue; |
| 1185 | |
| 1186 | free_irq(chan->irq, chan); |
| 1187 | } |
| 1188 | |
| 1189 | return ret; |
| 1190 | } |
| 1191 | |
Ira Snyder | a4f56d4 | 2010-01-06 13:34:01 +0000 | [diff] [blame] | 1192 | /*----------------------------------------------------------------------------*/ |
| 1193 | /* OpenFirmware Subsystem */ |
| 1194 | /*----------------------------------------------------------------------------*/ |
| 1195 | |
| 1196 | static int __devinit fsl_dma_chan_probe(struct fsldma_device *fdev, |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1197 | struct device_node *node, u32 feature, const char *compatible) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1198 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1199 | struct fsldma_chan *chan; |
Ira Snyder | 4ce0e95 | 2010-01-06 13:34:00 +0000 | [diff] [blame] | 1200 | struct resource res; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1201 | int err; |
| 1202 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1203 | /* alloc channel */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1204 | chan = kzalloc(sizeof(*chan), GFP_KERNEL); |
| 1205 | if (!chan) { |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1206 | dev_err(fdev->dev, "no free memory for DMA channels!\n"); |
| 1207 | err = -ENOMEM; |
| 1208 | goto out_return; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1209 | } |
| 1210 | |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1211 | /* ioremap registers for use */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1212 | chan->regs = of_iomap(node, 0); |
| 1213 | if (!chan->regs) { |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1214 | dev_err(fdev->dev, "unable to ioremap registers\n"); |
| 1215 | err = -ENOMEM; |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1216 | goto out_free_chan; |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1217 | } |
| 1218 | |
Ira Snyder | 4ce0e95 | 2010-01-06 13:34:00 +0000 | [diff] [blame] | 1219 | err = of_address_to_resource(node, 0, &res); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1220 | if (err) { |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1221 | dev_err(fdev->dev, "unable to find 'reg' property\n"); |
| 1222 | goto out_iounmap_regs; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1223 | } |
| 1224 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1225 | chan->feature = feature; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1226 | if (!fdev->feature) |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1227 | fdev->feature = chan->feature; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1228 | |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1229 | /* |
| 1230 | * If the DMA device's feature is different than the feature |
| 1231 | * of its channels, report the bug |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1232 | */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1233 | WARN_ON(fdev->feature != chan->feature); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1234 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1235 | chan->dev = fdev->dev; |
| 1236 | chan->id = ((res.start - 0x100) & 0xfff) >> 7; |
| 1237 | if (chan->id >= FSL_DMA_MAX_CHANS_PER_DEVICE) { |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1238 | dev_err(fdev->dev, "too many channels for device\n"); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1239 | err = -EINVAL; |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1240 | goto out_iounmap_regs; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1241 | } |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1242 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1243 | fdev->chan[chan->id] = chan; |
| 1244 | tasklet_init(&chan->tasklet, dma_do_tasklet, (unsigned long)chan); |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1245 | |
| 1246 | /* Initialize the channel */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1247 | dma_init(chan); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1248 | |
| 1249 | /* Clear cdar registers */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1250 | set_cdar(chan, 0); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1251 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1252 | switch (chan->feature & FSL_DMA_IP_MASK) { |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1253 | case FSL_DMA_IP_85XX: |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1254 | chan->toggle_ext_pause = fsl_chan_toggle_ext_pause; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1255 | case FSL_DMA_IP_83XX: |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1256 | chan->toggle_ext_start = fsl_chan_toggle_ext_start; |
| 1257 | chan->set_src_loop_size = fsl_chan_set_src_loop_size; |
| 1258 | chan->set_dst_loop_size = fsl_chan_set_dst_loop_size; |
| 1259 | chan->set_request_count = fsl_chan_set_request_count; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1260 | } |
| 1261 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1262 | spin_lock_init(&chan->desc_lock); |
Ira Snyder | 9c3a50b | 2010-01-06 13:34:06 +0000 | [diff] [blame] | 1263 | INIT_LIST_HEAD(&chan->ld_pending); |
| 1264 | INIT_LIST_HEAD(&chan->ld_running); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1265 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1266 | chan->common.device = &fdev->common; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1267 | |
Ira Snyder | d3f620b | 2010-01-06 13:34:04 +0000 | [diff] [blame] | 1268 | /* find the IRQ line, if it exists in the device tree */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1269 | chan->irq = irq_of_parse_and_map(node, 0); |
Ira Snyder | d3f620b | 2010-01-06 13:34:04 +0000 | [diff] [blame] | 1270 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1271 | /* Add the channel to DMA device channel list */ |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1272 | list_add_tail(&chan->common.device_node, &fdev->common.channels); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1273 | fdev->common.chancnt++; |
| 1274 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1275 | dev_info(fdev->dev, "#%d (%s), irq %d\n", chan->id, compatible, |
| 1276 | chan->irq != NO_IRQ ? chan->irq : fdev->irq); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1277 | |
| 1278 | return 0; |
Li Yang | 51ee87f | 2008-05-29 23:25:45 -0700 | [diff] [blame] | 1279 | |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1280 | out_iounmap_regs: |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1281 | iounmap(chan->regs); |
| 1282 | out_free_chan: |
| 1283 | kfree(chan); |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1284 | out_return: |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1285 | return err; |
| 1286 | } |
| 1287 | |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1288 | static void fsl_dma_chan_remove(struct fsldma_chan *chan) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1289 | { |
Ira Snyder | a1c0331 | 2010-01-06 13:34:05 +0000 | [diff] [blame] | 1290 | irq_dispose_mapping(chan->irq); |
| 1291 | list_del(&chan->common.device_node); |
| 1292 | iounmap(chan->regs); |
| 1293 | kfree(chan); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1294 | } |
| 1295 | |
Grant Likely | 2dc1158 | 2010-08-06 09:25:50 -0600 | [diff] [blame] | 1296 | static int __devinit fsldma_of_probe(struct platform_device *op, |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1297 | const struct of_device_id *match) |
| 1298 | { |
Ira Snyder | a4f56d4 | 2010-01-06 13:34:01 +0000 | [diff] [blame] | 1299 | struct fsldma_device *fdev; |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1300 | struct device_node *child; |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1301 | int err; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1302 | |
Ira Snyder | a4f56d4 | 2010-01-06 13:34:01 +0000 | [diff] [blame] | 1303 | fdev = kzalloc(sizeof(*fdev), GFP_KERNEL); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1304 | if (!fdev) { |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1305 | dev_err(&op->dev, "No enough memory for 'priv'\n"); |
| 1306 | err = -ENOMEM; |
| 1307 | goto out_return; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1308 | } |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1309 | |
| 1310 | fdev->dev = &op->dev; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1311 | INIT_LIST_HEAD(&fdev->common.channels); |
| 1312 | |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1313 | /* ioremap the registers for use */ |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 1314 | fdev->regs = of_iomap(op->dev.of_node, 0); |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1315 | if (!fdev->regs) { |
| 1316 | dev_err(&op->dev, "unable to ioremap registers\n"); |
| 1317 | err = -ENOMEM; |
| 1318 | goto out_free_fdev; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1319 | } |
| 1320 | |
Ira Snyder | d3f620b | 2010-01-06 13:34:04 +0000 | [diff] [blame] | 1321 | /* map the channel IRQ if it exists, but don't hookup the handler yet */ |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 1322 | fdev->irq = irq_of_parse_and_map(op->dev.of_node, 0); |
Ira Snyder | d3f620b | 2010-01-06 13:34:04 +0000 | [diff] [blame] | 1323 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1324 | dma_cap_set(DMA_MEMCPY, fdev->common.cap_mask); |
| 1325 | dma_cap_set(DMA_INTERRUPT, fdev->common.cap_mask); |
Ira Snyder | c1433041 | 2010-09-30 11:46:45 +0000 | [diff] [blame] | 1326 | dma_cap_set(DMA_SG, fdev->common.cap_mask); |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 1327 | dma_cap_set(DMA_SLAVE, fdev->common.cap_mask); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1328 | fdev->common.device_alloc_chan_resources = fsl_dma_alloc_chan_resources; |
| 1329 | fdev->common.device_free_chan_resources = fsl_dma_free_chan_resources; |
Zhang Wei | 2187c26 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 1330 | fdev->common.device_prep_dma_interrupt = fsl_dma_prep_interrupt; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1331 | fdev->common.device_prep_dma_memcpy = fsl_dma_prep_memcpy; |
Ira Snyder | c1433041 | 2010-09-30 11:46:45 +0000 | [diff] [blame] | 1332 | fdev->common.device_prep_dma_sg = fsl_dma_prep_sg; |
Linus Walleij | 0793448 | 2010-03-26 16:50:49 -0700 | [diff] [blame] | 1333 | fdev->common.device_tx_status = fsl_tx_status; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1334 | fdev->common.device_issue_pending = fsl_dma_memcpy_issue_pending; |
Ira Snyder | bbea0b6 | 2009-09-08 17:53:04 -0700 | [diff] [blame] | 1335 | fdev->common.device_prep_slave_sg = fsl_dma_prep_slave_sg; |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 1336 | fdev->common.device_control = fsl_dma_device_control; |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1337 | fdev->common.dev = &op->dev; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1338 | |
Li Yang | e2c8e425 | 2010-11-11 20:16:29 +0800 | [diff] [blame] | 1339 | dma_set_mask(&(op->dev), DMA_BIT_MASK(36)); |
| 1340 | |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1341 | dev_set_drvdata(&op->dev, fdev); |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1342 | |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1343 | /* |
| 1344 | * We cannot use of_platform_bus_probe() because there is no |
| 1345 | * of_platform_bus_remove(). Instead, we manually instantiate every DMA |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1346 | * channel object. |
| 1347 | */ |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 1348 | for_each_child_of_node(op->dev.of_node, child) { |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1349 | if (of_device_is_compatible(child, "fsl,eloplus-dma-channel")) { |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1350 | fsl_dma_chan_probe(fdev, child, |
| 1351 | FSL_DMA_IP_85XX | FSL_DMA_BIG_ENDIAN, |
| 1352 | "fsl,eloplus-dma-channel"); |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1353 | } |
| 1354 | |
| 1355 | if (of_device_is_compatible(child, "fsl,elo-dma-channel")) { |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1356 | fsl_dma_chan_probe(fdev, child, |
| 1357 | FSL_DMA_IP_83XX | FSL_DMA_LITTLE_ENDIAN, |
| 1358 | "fsl,elo-dma-channel"); |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1359 | } |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1360 | } |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1361 | |
Ira Snyder | d3f620b | 2010-01-06 13:34:04 +0000 | [diff] [blame] | 1362 | /* |
| 1363 | * Hookup the IRQ handler(s) |
| 1364 | * |
| 1365 | * If we have a per-controller interrupt, we prefer that to the |
| 1366 | * per-channel interrupts to reduce the number of shared interrupt |
| 1367 | * handlers on the same IRQ line |
| 1368 | */ |
| 1369 | err = fsldma_request_irqs(fdev); |
| 1370 | if (err) { |
| 1371 | dev_err(fdev->dev, "unable to request IRQs\n"); |
| 1372 | goto out_free_fdev; |
| 1373 | } |
| 1374 | |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1375 | dma_async_device_register(&fdev->common); |
| 1376 | return 0; |
| 1377 | |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1378 | out_free_fdev: |
Ira Snyder | d3f620b | 2010-01-06 13:34:04 +0000 | [diff] [blame] | 1379 | irq_dispose_mapping(fdev->irq); |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1380 | kfree(fdev); |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1381 | out_return: |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1382 | return err; |
| 1383 | } |
| 1384 | |
Grant Likely | 2dc1158 | 2010-08-06 09:25:50 -0600 | [diff] [blame] | 1385 | static int fsldma_of_remove(struct platform_device *op) |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1386 | { |
Ira Snyder | a4f56d4 | 2010-01-06 13:34:01 +0000 | [diff] [blame] | 1387 | struct fsldma_device *fdev; |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1388 | unsigned int i; |
| 1389 | |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1390 | fdev = dev_get_drvdata(&op->dev); |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1391 | dma_async_device_unregister(&fdev->common); |
| 1392 | |
Ira Snyder | d3f620b | 2010-01-06 13:34:04 +0000 | [diff] [blame] | 1393 | fsldma_free_irqs(fdev); |
| 1394 | |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1395 | for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) { |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1396 | if (fdev->chan[i]) |
| 1397 | fsl_dma_chan_remove(fdev->chan[i]); |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1398 | } |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1399 | |
Ira Snyder | e7a2915 | 2010-01-06 13:34:03 +0000 | [diff] [blame] | 1400 | iounmap(fdev->regs); |
| 1401 | dev_set_drvdata(&op->dev, NULL); |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1402 | kfree(fdev); |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1403 | |
| 1404 | return 0; |
| 1405 | } |
| 1406 | |
Márton Németh | 4b1cf1f | 2010-02-02 23:41:06 -0700 | [diff] [blame] | 1407 | static const struct of_device_id fsldma_of_ids[] = { |
Kumar Gala | 049c9d4 | 2008-03-31 11:13:21 -0500 | [diff] [blame] | 1408 | { .compatible = "fsl,eloplus-dma", }, |
| 1409 | { .compatible = "fsl,elo-dma", }, |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1410 | {} |
| 1411 | }; |
| 1412 | |
Ira Snyder | a4f56d4 | 2010-01-06 13:34:01 +0000 | [diff] [blame] | 1413 | static struct of_platform_driver fsldma_of_driver = { |
Grant Likely | 4018294 | 2010-04-13 16:13:02 -0700 | [diff] [blame] | 1414 | .driver = { |
| 1415 | .name = "fsl-elo-dma", |
| 1416 | .owner = THIS_MODULE, |
| 1417 | .of_match_table = fsldma_of_ids, |
| 1418 | }, |
| 1419 | .probe = fsldma_of_probe, |
| 1420 | .remove = fsldma_of_remove, |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1421 | }; |
| 1422 | |
Ira Snyder | a4f56d4 | 2010-01-06 13:34:01 +0000 | [diff] [blame] | 1423 | /*----------------------------------------------------------------------------*/ |
| 1424 | /* Module Init / Exit */ |
| 1425 | /*----------------------------------------------------------------------------*/ |
| 1426 | |
| 1427 | static __init int fsldma_init(void) |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1428 | { |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1429 | int ret; |
| 1430 | |
| 1431 | pr_info("Freescale Elo / Elo Plus DMA driver\n"); |
| 1432 | |
Ira Snyder | a4f56d4 | 2010-01-06 13:34:01 +0000 | [diff] [blame] | 1433 | ret = of_register_platform_driver(&fsldma_of_driver); |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1434 | if (ret) |
| 1435 | pr_err("fsldma: failed to register platform driver\n"); |
| 1436 | |
| 1437 | return ret; |
Zhang Wei | 173acc7 | 2008-03-01 07:42:48 -0700 | [diff] [blame] | 1438 | } |
| 1439 | |
Ira Snyder | a4f56d4 | 2010-01-06 13:34:01 +0000 | [diff] [blame] | 1440 | static void __exit fsldma_exit(void) |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1441 | { |
Ira Snyder | a4f56d4 | 2010-01-06 13:34:01 +0000 | [diff] [blame] | 1442 | of_unregister_platform_driver(&fsldma_of_driver); |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1443 | } |
| 1444 | |
Ira Snyder | a4f56d4 | 2010-01-06 13:34:01 +0000 | [diff] [blame] | 1445 | subsys_initcall(fsldma_init); |
| 1446 | module_exit(fsldma_exit); |
Timur Tabi | 77cd62e | 2008-09-26 17:00:11 -0700 | [diff] [blame] | 1447 | |
| 1448 | MODULE_DESCRIPTION("Freescale Elo / Elo Plus DMA driver"); |
| 1449 | MODULE_LICENSE("GPL"); |