Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 1 | /* |
| 2 | * drivers/dma/imx-dma.c |
| 3 | * |
| 4 | * This file contains a driver for the Freescale i.MX DMA engine |
| 5 | * found on i.MX1/21/27 |
| 6 | * |
| 7 | * Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 8 | * Copyright 2012 Javier Martin, Vista Silicon <javier.martin@vista-silicon.com> |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 9 | * |
| 10 | * The code contained herein is licensed under the GNU General Public |
| 11 | * License. You may obtain a copy of the GNU General Public License |
| 12 | * Version 2 or later at the following locations: |
| 13 | * |
| 14 | * http://www.opensource.org/licenses/gpl-license.html |
| 15 | * http://www.gnu.org/copyleft/gpl.html |
| 16 | */ |
| 17 | #include <linux/init.h> |
Axel Lin | f8de8f4 | 2011-08-30 15:08:24 +0800 | [diff] [blame] | 18 | #include <linux/module.h> |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 19 | #include <linux/types.h> |
| 20 | #include <linux/mm.h> |
| 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/spinlock.h> |
| 23 | #include <linux/device.h> |
| 24 | #include <linux/dma-mapping.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/platform_device.h> |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 27 | #include <linux/clk.h> |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 28 | #include <linux/dmaengine.h> |
Vinod Koul | 5170c05 | 2012-03-09 14:55:25 +0530 | [diff] [blame] | 29 | #include <linux/module.h> |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 30 | |
| 31 | #include <asm/irq.h> |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 32 | #include <mach/dma.h> |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 33 | #include <mach/hardware.h> |
| 34 | |
Russell King - ARM Linux | d2ebfb3 | 2012-03-06 22:34:26 +0000 | [diff] [blame] | 35 | #include "dmaengine.h" |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 36 | #define IMXDMA_MAX_CHAN_DESCRIPTORS 16 |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 37 | #define IMX_DMA_CHANNELS 16 |
| 38 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 39 | #define IMX_DMA_LENGTH_LOOP ((unsigned int)-1) |
| 40 | #define IMX_DMA_MEMSIZE_32 (0 << 4) |
| 41 | #define IMX_DMA_MEMSIZE_8 (1 << 4) |
| 42 | #define IMX_DMA_MEMSIZE_16 (2 << 4) |
| 43 | #define IMX_DMA_TYPE_LINEAR (0 << 10) |
| 44 | #define IMX_DMA_TYPE_2D (1 << 10) |
| 45 | #define IMX_DMA_TYPE_FIFO (2 << 10) |
| 46 | |
| 47 | #define IMX_DMA_ERR_BURST (1 << 0) |
| 48 | #define IMX_DMA_ERR_REQUEST (1 << 1) |
| 49 | #define IMX_DMA_ERR_TRANSFER (1 << 2) |
| 50 | #define IMX_DMA_ERR_BUFFER (1 << 3) |
| 51 | #define IMX_DMA_ERR_TIMEOUT (1 << 4) |
| 52 | |
| 53 | #define DMA_DCR 0x00 /* Control Register */ |
| 54 | #define DMA_DISR 0x04 /* Interrupt status Register */ |
| 55 | #define DMA_DIMR 0x08 /* Interrupt mask Register */ |
| 56 | #define DMA_DBTOSR 0x0c /* Burst timeout status Register */ |
| 57 | #define DMA_DRTOSR 0x10 /* Request timeout Register */ |
| 58 | #define DMA_DSESR 0x14 /* Transfer Error Status Register */ |
| 59 | #define DMA_DBOSR 0x18 /* Buffer overflow status Register */ |
| 60 | #define DMA_DBTOCR 0x1c /* Burst timeout control Register */ |
| 61 | #define DMA_WSRA 0x40 /* W-Size Register A */ |
| 62 | #define DMA_XSRA 0x44 /* X-Size Register A */ |
| 63 | #define DMA_YSRA 0x48 /* Y-Size Register A */ |
| 64 | #define DMA_WSRB 0x4c /* W-Size Register B */ |
| 65 | #define DMA_XSRB 0x50 /* X-Size Register B */ |
| 66 | #define DMA_YSRB 0x54 /* Y-Size Register B */ |
| 67 | #define DMA_SAR(x) (0x80 + ((x) << 6)) /* Source Address Registers */ |
| 68 | #define DMA_DAR(x) (0x84 + ((x) << 6)) /* Destination Address Registers */ |
| 69 | #define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */ |
| 70 | #define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */ |
| 71 | #define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */ |
| 72 | #define DMA_BLR(x) (0x94 + ((x) << 6)) /* Burst length Registers */ |
| 73 | #define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */ |
| 74 | #define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */ |
| 75 | #define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */ |
| 76 | |
| 77 | #define DCR_DRST (1<<1) |
| 78 | #define DCR_DEN (1<<0) |
| 79 | #define DBTOCR_EN (1<<15) |
| 80 | #define DBTOCR_CNT(x) ((x) & 0x7fff) |
| 81 | #define CNTR_CNT(x) ((x) & 0xffffff) |
| 82 | #define CCR_ACRPT (1<<14) |
| 83 | #define CCR_DMOD_LINEAR (0x0 << 12) |
| 84 | #define CCR_DMOD_2D (0x1 << 12) |
| 85 | #define CCR_DMOD_FIFO (0x2 << 12) |
| 86 | #define CCR_DMOD_EOBFIFO (0x3 << 12) |
| 87 | #define CCR_SMOD_LINEAR (0x0 << 10) |
| 88 | #define CCR_SMOD_2D (0x1 << 10) |
| 89 | #define CCR_SMOD_FIFO (0x2 << 10) |
| 90 | #define CCR_SMOD_EOBFIFO (0x3 << 10) |
| 91 | #define CCR_MDIR_DEC (1<<9) |
| 92 | #define CCR_MSEL_B (1<<8) |
| 93 | #define CCR_DSIZ_32 (0x0 << 6) |
| 94 | #define CCR_DSIZ_8 (0x1 << 6) |
| 95 | #define CCR_DSIZ_16 (0x2 << 6) |
| 96 | #define CCR_SSIZ_32 (0x0 << 4) |
| 97 | #define CCR_SSIZ_8 (0x1 << 4) |
| 98 | #define CCR_SSIZ_16 (0x2 << 4) |
| 99 | #define CCR_REN (1<<3) |
| 100 | #define CCR_RPT (1<<2) |
| 101 | #define CCR_FRC (1<<1) |
| 102 | #define CCR_CEN (1<<0) |
| 103 | #define RTOR_EN (1<<15) |
| 104 | #define RTOR_CLK (1<<14) |
| 105 | #define RTOR_PSC (1<<13) |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 106 | |
| 107 | enum imxdma_prep_type { |
| 108 | IMXDMA_DESC_MEMCPY, |
| 109 | IMXDMA_DESC_INTERLEAVED, |
| 110 | IMXDMA_DESC_SLAVE_SG, |
| 111 | IMXDMA_DESC_CYCLIC, |
| 112 | }; |
| 113 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 114 | /* |
| 115 | * struct imxdma_channel_internal - i.MX specific DMA extension |
| 116 | * @name: name specified by DMA client |
| 117 | * @irq_handler: client callback for end of transfer |
| 118 | * @err_handler: client callback for error condition |
| 119 | * @data: clients context data for callbacks |
| 120 | * @dma_mode: direction of the transfer %DMA_MODE_READ or %DMA_MODE_WRITE |
| 121 | * @sg: pointer to the actual read/written chunk for scatter-gather emulation |
| 122 | * @resbytes: total residual number of bytes to transfer |
| 123 | * (it can be lower or same as sum of SG mapped chunk sizes) |
| 124 | * @sgcount: number of chunks to be read/written |
| 125 | * |
| 126 | * Structure is used for IMX DMA processing. It would be probably good |
| 127 | * @struct dma_struct in the future for external interfacing and use |
| 128 | * @struct imxdma_channel_internal only as extension to it. |
| 129 | */ |
| 130 | |
| 131 | struct imxdma_channel_internal { |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 132 | unsigned int resbytes; |
| 133 | |
| 134 | int in_use; |
| 135 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 136 | struct timer_list watchdog; |
| 137 | |
| 138 | int hw_chaining; |
| 139 | }; |
| 140 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 141 | struct imxdma_desc { |
| 142 | struct list_head node; |
| 143 | struct dma_async_tx_descriptor desc; |
| 144 | enum dma_status status; |
| 145 | dma_addr_t src; |
| 146 | dma_addr_t dest; |
| 147 | size_t len; |
Javier Martin | 2efc344 | 2012-03-22 14:54:03 +0100 | [diff] [blame] | 148 | enum dma_transfer_direction direction; |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 149 | enum imxdma_prep_type type; |
| 150 | /* For memcpy and interleaved */ |
| 151 | unsigned int config_port; |
| 152 | unsigned int config_mem; |
| 153 | /* For interleaved transfers */ |
| 154 | unsigned int x; |
| 155 | unsigned int y; |
| 156 | unsigned int w; |
| 157 | /* For slave sg and cyclic */ |
| 158 | struct scatterlist *sg; |
| 159 | unsigned int sgcount; |
| 160 | }; |
| 161 | |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 162 | struct imxdma_channel { |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 163 | struct imxdma_channel_internal internal; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 164 | struct imxdma_engine *imxdma; |
| 165 | unsigned int channel; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 166 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 167 | struct tasklet_struct dma_tasklet; |
| 168 | struct list_head ld_free; |
| 169 | struct list_head ld_queue; |
| 170 | struct list_head ld_active; |
| 171 | int descs_allocated; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 172 | enum dma_slave_buswidth word_size; |
| 173 | dma_addr_t per_address; |
| 174 | u32 watermark_level; |
| 175 | struct dma_chan chan; |
| 176 | spinlock_t lock; |
| 177 | struct dma_async_tx_descriptor desc; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 178 | enum dma_status status; |
| 179 | int dma_request; |
| 180 | struct scatterlist *sg_list; |
Javier Martin | 359291a | 2012-03-22 14:54:06 +0100 | [diff] [blame] | 181 | u32 ccr_from_device; |
| 182 | u32 ccr_to_device; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 183 | }; |
| 184 | |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 185 | struct imxdma_engine { |
| 186 | struct device *dev; |
Sascha Hauer | 1e070a6 | 2011-01-12 13:14:37 +0100 | [diff] [blame] | 187 | struct device_dma_parameters dma_parms; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 188 | struct dma_device dma_device; |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 189 | struct imxdma_channel channel[IMX_DMA_CHANNELS]; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 190 | }; |
| 191 | |
| 192 | static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan) |
| 193 | { |
| 194 | return container_of(chan, struct imxdma_channel, chan); |
| 195 | } |
| 196 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 197 | static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel *imxdmac) |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 198 | { |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 199 | struct imxdma_desc *desc; |
| 200 | |
| 201 | if (!list_empty(&imxdmac->ld_active)) { |
| 202 | desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, |
| 203 | node); |
| 204 | if (desc->type == IMXDMA_DESC_CYCLIC) |
| 205 | return true; |
| 206 | } |
| 207 | return false; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 208 | } |
| 209 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 210 | /* TODO: put this inside any struct */ |
| 211 | static void __iomem *imx_dmav1_baseaddr; |
| 212 | static struct clk *dma_clk; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 213 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 214 | static void imx_dmav1_writel(unsigned val, unsigned offset) |
| 215 | { |
| 216 | __raw_writel(val, imx_dmav1_baseaddr + offset); |
| 217 | } |
| 218 | |
| 219 | static unsigned imx_dmav1_readl(unsigned offset) |
| 220 | { |
| 221 | return __raw_readl(imx_dmav1_baseaddr + offset); |
| 222 | } |
| 223 | |
| 224 | static int imxdma_hw_chain(struct imxdma_channel_internal *imxdma) |
| 225 | { |
| 226 | if (cpu_is_mx27()) |
| 227 | return imxdma->hw_chaining; |
| 228 | else |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | /* |
| 233 | * imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation |
| 234 | */ |
Javier Martin | 2efc344 | 2012-03-22 14:54:03 +0100 | [diff] [blame] | 235 | static inline int imxdma_sg_next(struct imxdma_desc *d, struct scatterlist *sg) |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 236 | { |
Javier Martin | 2efc344 | 2012-03-22 14:54:03 +0100 | [diff] [blame] | 237 | struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan); |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 238 | struct imxdma_channel_internal *imxdma = &imxdmac->internal; |
| 239 | unsigned long now; |
| 240 | |
| 241 | now = min(imxdma->resbytes, sg->length); |
| 242 | if (imxdma->resbytes != IMX_DMA_LENGTH_LOOP) |
| 243 | imxdma->resbytes -= now; |
| 244 | |
Javier Martin | 2efc344 | 2012-03-22 14:54:03 +0100 | [diff] [blame] | 245 | if (d->direction == DMA_DEV_TO_MEM) |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 246 | imx_dmav1_writel(sg->dma_address, DMA_DAR(imxdmac->channel)); |
| 247 | else |
| 248 | imx_dmav1_writel(sg->dma_address, DMA_SAR(imxdmac->channel)); |
| 249 | |
| 250 | imx_dmav1_writel(now, DMA_CNTR(imxdmac->channel)); |
| 251 | |
| 252 | pr_debug("imxdma%d: next sg chunk dst 0x%08x, src 0x%08x, " |
| 253 | "size 0x%08x\n", imxdmac->channel, |
| 254 | imx_dmav1_readl(DMA_DAR(imxdmac->channel)), |
| 255 | imx_dmav1_readl(DMA_SAR(imxdmac->channel)), |
| 256 | imx_dmav1_readl(DMA_CNTR(imxdmac->channel))); |
| 257 | |
| 258 | return now; |
| 259 | } |
| 260 | |
Javier Martin | 2efc344 | 2012-03-22 14:54:03 +0100 | [diff] [blame] | 261 | static void imxdma_enable_hw(struct imxdma_desc *d) |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 262 | { |
Javier Martin | 2efc344 | 2012-03-22 14:54:03 +0100 | [diff] [blame] | 263 | struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan); |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 264 | int channel = imxdmac->channel; |
| 265 | unsigned long flags; |
| 266 | |
| 267 | pr_debug("imxdma%d: imx_dma_enable\n", channel); |
| 268 | |
| 269 | if (imxdmac->internal.in_use) |
| 270 | return; |
| 271 | |
| 272 | local_irq_save(flags); |
| 273 | |
| 274 | imx_dmav1_writel(1 << channel, DMA_DISR); |
| 275 | imx_dmav1_writel(imx_dmav1_readl(DMA_DIMR) & ~(1 << channel), DMA_DIMR); |
| 276 | imx_dmav1_writel(imx_dmav1_readl(DMA_CCR(channel)) | CCR_CEN | |
| 277 | CCR_ACRPT, DMA_CCR(channel)); |
| 278 | |
| 279 | if ((cpu_is_mx21() || cpu_is_mx27()) && |
Javier Martin | 833bc03 | 2012-03-22 14:54:07 +0100 | [diff] [blame^] | 280 | d->sg && imxdma_hw_chain(&imxdmac->internal)) { |
| 281 | d->sg = sg_next(d->sg); |
| 282 | if (d->sg) { |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 283 | u32 tmp; |
Javier Martin | 833bc03 | 2012-03-22 14:54:07 +0100 | [diff] [blame^] | 284 | imxdma_sg_next(d, d->sg); |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 285 | tmp = imx_dmav1_readl(DMA_CCR(channel)); |
| 286 | imx_dmav1_writel(tmp | CCR_RPT | CCR_ACRPT, |
| 287 | DMA_CCR(channel)); |
| 288 | } |
| 289 | } |
| 290 | imxdmac->internal.in_use = 1; |
| 291 | |
| 292 | local_irq_restore(flags); |
| 293 | } |
| 294 | |
| 295 | static void imxdma_disable_hw(struct imxdma_channel *imxdmac) |
| 296 | { |
| 297 | int channel = imxdmac->channel; |
| 298 | unsigned long flags; |
| 299 | |
| 300 | pr_debug("imxdma%d: imx_dma_disable\n", channel); |
| 301 | |
| 302 | if (imxdma_hw_chain(&imxdmac->internal)) |
| 303 | del_timer(&imxdmac->internal.watchdog); |
| 304 | |
| 305 | local_irq_save(flags); |
| 306 | imx_dmav1_writel(imx_dmav1_readl(DMA_DIMR) | (1 << channel), DMA_DIMR); |
| 307 | imx_dmav1_writel(imx_dmav1_readl(DMA_CCR(channel)) & ~CCR_CEN, |
| 308 | DMA_CCR(channel)); |
| 309 | imx_dmav1_writel(1 << channel, DMA_DISR); |
| 310 | imxdmac->internal.in_use = 0; |
| 311 | local_irq_restore(flags); |
| 312 | } |
| 313 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 314 | static void imxdma_watchdog(unsigned long data) |
| 315 | { |
| 316 | struct imxdma_channel *imxdmac = (struct imxdma_channel *)data; |
| 317 | int channel = imxdmac->channel; |
| 318 | |
| 319 | imx_dmav1_writel(0, DMA_CCR(channel)); |
| 320 | imxdmac->internal.in_use = 0; |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 321 | |
| 322 | /* Tasklet watchdog error handler */ |
| 323 | tasklet_schedule(&imxdmac->dma_tasklet); |
| 324 | pr_debug("imxdma%d: watchdog timeout!\n", imxdmac->channel); |
| 325 | } |
| 326 | |
| 327 | static irqreturn_t imxdma_err_handler(int irq, void *dev_id) |
| 328 | { |
| 329 | struct imxdma_engine *imxdma = dev_id; |
| 330 | struct imxdma_channel_internal *internal; |
| 331 | unsigned int err_mask; |
| 332 | int i, disr; |
| 333 | int errcode; |
| 334 | |
| 335 | disr = imx_dmav1_readl(DMA_DISR); |
| 336 | |
| 337 | err_mask = imx_dmav1_readl(DMA_DBTOSR) | |
| 338 | imx_dmav1_readl(DMA_DRTOSR) | |
| 339 | imx_dmav1_readl(DMA_DSESR) | |
| 340 | imx_dmav1_readl(DMA_DBOSR); |
| 341 | |
| 342 | if (!err_mask) |
| 343 | return IRQ_HANDLED; |
| 344 | |
| 345 | imx_dmav1_writel(disr & err_mask, DMA_DISR); |
| 346 | |
| 347 | for (i = 0; i < IMX_DMA_CHANNELS; i++) { |
| 348 | if (!(err_mask & (1 << i))) |
| 349 | continue; |
| 350 | internal = &imxdma->channel[i].internal; |
| 351 | errcode = 0; |
| 352 | |
| 353 | if (imx_dmav1_readl(DMA_DBTOSR) & (1 << i)) { |
| 354 | imx_dmav1_writel(1 << i, DMA_DBTOSR); |
| 355 | errcode |= IMX_DMA_ERR_BURST; |
| 356 | } |
| 357 | if (imx_dmav1_readl(DMA_DRTOSR) & (1 << i)) { |
| 358 | imx_dmav1_writel(1 << i, DMA_DRTOSR); |
| 359 | errcode |= IMX_DMA_ERR_REQUEST; |
| 360 | } |
| 361 | if (imx_dmav1_readl(DMA_DSESR) & (1 << i)) { |
| 362 | imx_dmav1_writel(1 << i, DMA_DSESR); |
| 363 | errcode |= IMX_DMA_ERR_TRANSFER; |
| 364 | } |
| 365 | if (imx_dmav1_readl(DMA_DBOSR) & (1 << i)) { |
| 366 | imx_dmav1_writel(1 << i, DMA_DBOSR); |
| 367 | errcode |= IMX_DMA_ERR_BUFFER; |
| 368 | } |
| 369 | /* Tasklet error handler */ |
| 370 | tasklet_schedule(&imxdma->channel[i].dma_tasklet); |
| 371 | |
| 372 | printk(KERN_WARNING |
| 373 | "DMA timeout on channel %d -%s%s%s%s\n", i, |
| 374 | errcode & IMX_DMA_ERR_BURST ? " burst" : "", |
| 375 | errcode & IMX_DMA_ERR_REQUEST ? " request" : "", |
| 376 | errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "", |
| 377 | errcode & IMX_DMA_ERR_BUFFER ? " buffer" : ""); |
| 378 | } |
| 379 | return IRQ_HANDLED; |
| 380 | } |
| 381 | |
| 382 | static void dma_irq_handle_channel(struct imxdma_channel *imxdmac) |
| 383 | { |
| 384 | struct imxdma_channel_internal *imxdma = &imxdmac->internal; |
| 385 | int chno = imxdmac->channel; |
Javier Martin | 2efc344 | 2012-03-22 14:54:03 +0100 | [diff] [blame] | 386 | struct imxdma_desc *desc; |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 387 | |
Javier Martin | 833bc03 | 2012-03-22 14:54:07 +0100 | [diff] [blame^] | 388 | spin_lock(&imxdmac->lock); |
| 389 | if (list_empty(&imxdmac->ld_active)) { |
| 390 | spin_unlock(&imxdmac->lock); |
| 391 | goto out; |
| 392 | } |
| 393 | |
| 394 | desc = list_first_entry(&imxdmac->ld_active, |
| 395 | struct imxdma_desc, |
| 396 | node); |
| 397 | spin_unlock(&imxdmac->lock); |
| 398 | |
| 399 | if (desc->sg) { |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 400 | u32 tmp; |
Javier Martin | 833bc03 | 2012-03-22 14:54:07 +0100 | [diff] [blame^] | 401 | desc->sg = sg_next(desc->sg); |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 402 | |
Javier Martin | 833bc03 | 2012-03-22 14:54:07 +0100 | [diff] [blame^] | 403 | if (desc->sg) { |
| 404 | imxdma_sg_next(desc, desc->sg); |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 405 | |
| 406 | tmp = imx_dmav1_readl(DMA_CCR(chno)); |
| 407 | |
| 408 | if (imxdma_hw_chain(imxdma)) { |
| 409 | /* FIXME: The timeout should probably be |
| 410 | * configurable |
| 411 | */ |
| 412 | mod_timer(&imxdma->watchdog, |
| 413 | jiffies + msecs_to_jiffies(500)); |
| 414 | |
| 415 | tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT; |
| 416 | imx_dmav1_writel(tmp, DMA_CCR(chno)); |
| 417 | } else { |
| 418 | imx_dmav1_writel(tmp & ~CCR_CEN, DMA_CCR(chno)); |
| 419 | tmp |= CCR_CEN; |
| 420 | } |
| 421 | |
| 422 | imx_dmav1_writel(tmp, DMA_CCR(chno)); |
| 423 | |
| 424 | if (imxdma_chan_is_doing_cyclic(imxdmac)) |
| 425 | /* Tasklet progression */ |
| 426 | tasklet_schedule(&imxdmac->dma_tasklet); |
| 427 | |
| 428 | return; |
| 429 | } |
| 430 | |
| 431 | if (imxdma_hw_chain(imxdma)) { |
| 432 | del_timer(&imxdma->watchdog); |
| 433 | return; |
| 434 | } |
| 435 | } |
| 436 | |
Javier Martin | 2efc344 | 2012-03-22 14:54:03 +0100 | [diff] [blame] | 437 | out: |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 438 | imx_dmav1_writel(0, DMA_CCR(chno)); |
| 439 | imxdma->in_use = 0; |
| 440 | /* Tasklet irq */ |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 441 | tasklet_schedule(&imxdmac->dma_tasklet); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 442 | } |
| 443 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 444 | static irqreturn_t dma_irq_handler(int irq, void *dev_id) |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 445 | { |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 446 | struct imxdma_engine *imxdma = dev_id; |
| 447 | struct imxdma_channel_internal *internal; |
| 448 | int i, disr; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 449 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 450 | if (cpu_is_mx21() || cpu_is_mx27()) |
| 451 | imxdma_err_handler(irq, dev_id); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 452 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 453 | disr = imx_dmav1_readl(DMA_DISR); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 454 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 455 | pr_debug("imxdma: dma_irq_handler called, disr=0x%08x\n", |
| 456 | disr); |
| 457 | |
| 458 | imx_dmav1_writel(disr, DMA_DISR); |
| 459 | for (i = 0; i < IMX_DMA_CHANNELS; i++) { |
| 460 | if (disr & (1 << i)) { |
| 461 | internal = &imxdma->channel[i].internal; |
| 462 | dma_irq_handle_channel(&imxdma->channel[i]); |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | return IRQ_HANDLED; |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 467 | } |
| 468 | |
| 469 | static int imxdma_xfer_desc(struct imxdma_desc *d) |
| 470 | { |
| 471 | struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan); |
Javier Martin | 3b4b6df | 2012-03-22 14:54:04 +0100 | [diff] [blame] | 472 | struct imxdma_engine *imxdma = imxdmac->imxdma; |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 473 | |
| 474 | /* Configure and enable */ |
| 475 | switch (d->type) { |
| 476 | case IMXDMA_DESC_MEMCPY: |
Javier Martin | 3b4b6df | 2012-03-22 14:54:04 +0100 | [diff] [blame] | 477 | imx_dmav1_writel(d->src, DMA_SAR(imxdmac->channel)); |
| 478 | imx_dmav1_writel(d->dest, DMA_DAR(imxdmac->channel)); |
| 479 | imx_dmav1_writel(d->config_mem | (d->config_port << 2), |
| 480 | DMA_CCR(imxdmac->channel)); |
| 481 | |
| 482 | imx_dmav1_writel(d->len, DMA_CNTR(imxdmac->channel)); |
| 483 | |
| 484 | dev_dbg(imxdma->dev, "%s channel: %d dest=0x%08x src=0x%08x " |
| 485 | "dma_length=%d\n", __func__, imxdmac->channel, |
| 486 | d->dest, d->src, d->len); |
| 487 | |
| 488 | break; |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 489 | /* Cyclic transfer is the same as slave_sg with special sg configuration. */ |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 490 | case IMXDMA_DESC_CYCLIC: |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 491 | case IMXDMA_DESC_SLAVE_SG: |
Javier Martin | 359291a | 2012-03-22 14:54:06 +0100 | [diff] [blame] | 492 | imxdmac->internal.resbytes = d->len; |
| 493 | |
| 494 | if (d->direction == DMA_DEV_TO_MEM) { |
| 495 | imx_dmav1_writel(imxdmac->per_address, |
| 496 | DMA_SAR(imxdmac->channel)); |
| 497 | imx_dmav1_writel(imxdmac->ccr_from_device, |
| 498 | DMA_CCR(imxdmac->channel)); |
| 499 | |
| 500 | dev_dbg(imxdma->dev, "%s channel: %d sg=%p sgcount=%d " |
| 501 | "total length=%d dev_addr=0x%08x (dev2mem)\n", |
| 502 | __func__, imxdmac->channel, d->sg, d->sgcount, |
| 503 | d->len, imxdmac->per_address); |
| 504 | } else if (d->direction == DMA_MEM_TO_DEV) { |
| 505 | imx_dmav1_writel(imxdmac->per_address, |
| 506 | DMA_DAR(imxdmac->channel)); |
| 507 | imx_dmav1_writel(imxdmac->ccr_to_device, |
| 508 | DMA_CCR(imxdmac->channel)); |
| 509 | |
| 510 | dev_dbg(imxdma->dev, "%s channel: %d sg=%p sgcount=%d " |
| 511 | "total length=%d dev_addr=0x%08x (mem2dev)\n", |
| 512 | __func__, imxdmac->channel, d->sg, d->sgcount, |
| 513 | d->len, imxdmac->per_address); |
| 514 | } else { |
| 515 | dev_err(imxdma->dev, "%s channel: %d bad dma mode\n", |
| 516 | __func__, imxdmac->channel); |
| 517 | return -EINVAL; |
| 518 | } |
| 519 | |
| 520 | imxdma_sg_next(d, d->sg); |
| 521 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 522 | break; |
| 523 | default: |
| 524 | return -EINVAL; |
| 525 | } |
Javier Martin | 2efc344 | 2012-03-22 14:54:03 +0100 | [diff] [blame] | 526 | imxdma_enable_hw(d); |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | static void imxdma_tasklet(unsigned long data) |
| 531 | { |
| 532 | struct imxdma_channel *imxdmac = (void *)data; |
| 533 | struct imxdma_engine *imxdma = imxdmac->imxdma; |
| 534 | struct imxdma_desc *desc; |
| 535 | |
| 536 | spin_lock(&imxdmac->lock); |
| 537 | |
| 538 | if (list_empty(&imxdmac->ld_active)) { |
| 539 | /* Someone might have called terminate all */ |
| 540 | goto out; |
| 541 | } |
| 542 | desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node); |
| 543 | |
| 544 | if (desc->desc.callback) |
| 545 | desc->desc.callback(desc->desc.callback_param); |
| 546 | |
Vinod Koul | 1f3d6dc | 2012-03-13 12:39:49 +0530 | [diff] [blame] | 547 | dma_cookie_complete(&desc->desc); |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 548 | |
| 549 | /* If we are dealing with a cyclic descriptor keep it on ld_active */ |
| 550 | if (imxdma_chan_is_doing_cyclic(imxdmac)) |
| 551 | goto out; |
| 552 | |
| 553 | list_move_tail(imxdmac->ld_active.next, &imxdmac->ld_free); |
| 554 | |
| 555 | if (!list_empty(&imxdmac->ld_queue)) { |
| 556 | desc = list_first_entry(&imxdmac->ld_queue, struct imxdma_desc, |
| 557 | node); |
| 558 | list_move_tail(imxdmac->ld_queue.next, &imxdmac->ld_active); |
| 559 | if (imxdma_xfer_desc(desc) < 0) |
| 560 | dev_warn(imxdma->dev, "%s: channel: %d couldn't xfer desc\n", |
| 561 | __func__, imxdmac->channel); |
| 562 | } |
| 563 | out: |
| 564 | spin_unlock(&imxdmac->lock); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 565 | } |
| 566 | |
| 567 | static int imxdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, |
| 568 | unsigned long arg) |
| 569 | { |
| 570 | struct imxdma_channel *imxdmac = to_imxdma_chan(chan); |
| 571 | struct dma_slave_config *dmaengine_cfg = (void *)arg; |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 572 | unsigned long flags; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 573 | unsigned int mode = 0; |
| 574 | |
| 575 | switch (cmd) { |
| 576 | case DMA_TERMINATE_ALL: |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 577 | imxdma_disable_hw(imxdmac); |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 578 | |
| 579 | spin_lock_irqsave(&imxdmac->lock, flags); |
| 580 | list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free); |
| 581 | list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free); |
| 582 | spin_unlock_irqrestore(&imxdmac->lock, flags); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 583 | return 0; |
| 584 | case DMA_SLAVE_CONFIG: |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 585 | if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) { |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 586 | imxdmac->per_address = dmaengine_cfg->src_addr; |
| 587 | imxdmac->watermark_level = dmaengine_cfg->src_maxburst; |
| 588 | imxdmac->word_size = dmaengine_cfg->src_addr_width; |
| 589 | } else { |
| 590 | imxdmac->per_address = dmaengine_cfg->dst_addr; |
| 591 | imxdmac->watermark_level = dmaengine_cfg->dst_maxburst; |
| 592 | imxdmac->word_size = dmaengine_cfg->dst_addr_width; |
| 593 | } |
| 594 | |
| 595 | switch (imxdmac->word_size) { |
| 596 | case DMA_SLAVE_BUSWIDTH_1_BYTE: |
| 597 | mode = IMX_DMA_MEMSIZE_8; |
| 598 | break; |
| 599 | case DMA_SLAVE_BUSWIDTH_2_BYTES: |
| 600 | mode = IMX_DMA_MEMSIZE_16; |
| 601 | break; |
| 602 | default: |
| 603 | case DMA_SLAVE_BUSWIDTH_4_BYTES: |
| 604 | mode = IMX_DMA_MEMSIZE_32; |
| 605 | break; |
| 606 | } |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 607 | |
Javier Martin | bdc0c75 | 2012-03-22 14:54:05 +0100 | [diff] [blame] | 608 | imxdmac->internal.hw_chaining = 1; |
| 609 | if (!imxdma_hw_chain(&imxdmac->internal)) |
| 610 | return -EINVAL; |
Javier Martin | 359291a | 2012-03-22 14:54:06 +0100 | [diff] [blame] | 611 | imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) | |
Javier Martin | bdc0c75 | 2012-03-22 14:54:05 +0100 | [diff] [blame] | 612 | ((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) | |
| 613 | CCR_REN; |
Javier Martin | 359291a | 2012-03-22 14:54:06 +0100 | [diff] [blame] | 614 | imxdmac->ccr_to_device = |
Javier Martin | bdc0c75 | 2012-03-22 14:54:05 +0100 | [diff] [blame] | 615 | (IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) | |
| 616 | ((mode | IMX_DMA_TYPE_FIFO) << 2) | CCR_REN; |
| 617 | imx_dmav1_writel(imxdmac->dma_request, |
| 618 | DMA_RSSR(imxdmac->channel)); |
| 619 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 620 | /* Set burst length */ |
| 621 | imx_dmav1_writel(imxdmac->watermark_level * imxdmac->word_size, |
| 622 | DMA_BLR(imxdmac->channel)); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 623 | |
| 624 | return 0; |
| 625 | default: |
| 626 | return -ENOSYS; |
| 627 | } |
| 628 | |
| 629 | return -EINVAL; |
| 630 | } |
| 631 | |
| 632 | static enum dma_status imxdma_tx_status(struct dma_chan *chan, |
| 633 | dma_cookie_t cookie, |
| 634 | struct dma_tx_state *txstate) |
| 635 | { |
Russell King - ARM Linux | 96a2af4 | 2012-03-06 22:35:27 +0000 | [diff] [blame] | 636 | return dma_cookie_status(chan, cookie, txstate); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 637 | } |
| 638 | |
| 639 | static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx) |
| 640 | { |
| 641 | struct imxdma_channel *imxdmac = to_imxdma_chan(tx->chan); |
| 642 | dma_cookie_t cookie; |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 643 | unsigned long flags; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 644 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 645 | spin_lock_irqsave(&imxdmac->lock, flags); |
Russell King - ARM Linux | 884485e | 2012-03-06 22:34:46 +0000 | [diff] [blame] | 646 | cookie = dma_cookie_assign(tx); |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 647 | spin_unlock_irqrestore(&imxdmac->lock, flags); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 648 | |
| 649 | return cookie; |
| 650 | } |
| 651 | |
| 652 | static int imxdma_alloc_chan_resources(struct dma_chan *chan) |
| 653 | { |
| 654 | struct imxdma_channel *imxdmac = to_imxdma_chan(chan); |
| 655 | struct imx_dma_data *data = chan->private; |
| 656 | |
Javier Martin | 6c05f09 | 2012-02-28 17:08:17 +0100 | [diff] [blame] | 657 | if (data != NULL) |
| 658 | imxdmac->dma_request = data->dma_request; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 659 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 660 | while (imxdmac->descs_allocated < IMXDMA_MAX_CHAN_DESCRIPTORS) { |
| 661 | struct imxdma_desc *desc; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 662 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 663 | desc = kzalloc(sizeof(*desc), GFP_KERNEL); |
| 664 | if (!desc) |
| 665 | break; |
| 666 | __memzero(&desc->desc, sizeof(struct dma_async_tx_descriptor)); |
| 667 | dma_async_tx_descriptor_init(&desc->desc, chan); |
| 668 | desc->desc.tx_submit = imxdma_tx_submit; |
| 669 | /* txd.flags will be overwritten in prep funcs */ |
| 670 | desc->desc.flags = DMA_CTRL_ACK; |
| 671 | desc->status = DMA_SUCCESS; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 672 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 673 | list_add_tail(&desc->node, &imxdmac->ld_free); |
| 674 | imxdmac->descs_allocated++; |
| 675 | } |
| 676 | |
| 677 | if (!imxdmac->descs_allocated) |
| 678 | return -ENOMEM; |
| 679 | |
| 680 | return imxdmac->descs_allocated; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 681 | } |
| 682 | |
| 683 | static void imxdma_free_chan_resources(struct dma_chan *chan) |
| 684 | { |
| 685 | struct imxdma_channel *imxdmac = to_imxdma_chan(chan); |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 686 | struct imxdma_desc *desc, *_desc; |
| 687 | unsigned long flags; |
| 688 | |
| 689 | spin_lock_irqsave(&imxdmac->lock, flags); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 690 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 691 | imxdma_disable_hw(imxdmac); |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 692 | list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free); |
| 693 | list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free); |
| 694 | |
| 695 | spin_unlock_irqrestore(&imxdmac->lock, flags); |
| 696 | |
| 697 | list_for_each_entry_safe(desc, _desc, &imxdmac->ld_free, node) { |
| 698 | kfree(desc); |
| 699 | imxdmac->descs_allocated--; |
| 700 | } |
| 701 | INIT_LIST_HEAD(&imxdmac->ld_free); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 702 | |
| 703 | if (imxdmac->sg_list) { |
| 704 | kfree(imxdmac->sg_list); |
| 705 | imxdmac->sg_list = NULL; |
| 706 | } |
| 707 | } |
| 708 | |
| 709 | static struct dma_async_tx_descriptor *imxdma_prep_slave_sg( |
| 710 | struct dma_chan *chan, struct scatterlist *sgl, |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 711 | unsigned int sg_len, enum dma_transfer_direction direction, |
Alexandre Bounine | 185ecb5 | 2012-03-08 15:35:13 -0500 | [diff] [blame] | 712 | unsigned long flags, void *context) |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 713 | { |
| 714 | struct imxdma_channel *imxdmac = to_imxdma_chan(chan); |
| 715 | struct scatterlist *sg; |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 716 | int i, dma_length = 0; |
| 717 | struct imxdma_desc *desc; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 718 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 719 | if (list_empty(&imxdmac->ld_free) || |
| 720 | imxdma_chan_is_doing_cyclic(imxdmac)) |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 721 | return NULL; |
| 722 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 723 | desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 724 | |
| 725 | for_each_sg(sgl, sg, sg_len, i) { |
| 726 | dma_length += sg->length; |
| 727 | } |
| 728 | |
Sascha Hauer | d07102a | 2011-01-12 14:13:23 +0100 | [diff] [blame] | 729 | switch (imxdmac->word_size) { |
| 730 | case DMA_SLAVE_BUSWIDTH_4_BYTES: |
| 731 | if (sgl->length & 3 || sgl->dma_address & 3) |
| 732 | return NULL; |
| 733 | break; |
| 734 | case DMA_SLAVE_BUSWIDTH_2_BYTES: |
| 735 | if (sgl->length & 1 || sgl->dma_address & 1) |
| 736 | return NULL; |
| 737 | break; |
| 738 | case DMA_SLAVE_BUSWIDTH_1_BYTE: |
| 739 | break; |
| 740 | default: |
| 741 | return NULL; |
| 742 | } |
| 743 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 744 | desc->type = IMXDMA_DESC_SLAVE_SG; |
| 745 | desc->sg = sgl; |
| 746 | desc->sgcount = sg_len; |
| 747 | desc->len = dma_length; |
Javier Martin | 2efc344 | 2012-03-22 14:54:03 +0100 | [diff] [blame] | 748 | desc->direction = direction; |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 749 | if (direction == DMA_DEV_TO_MEM) { |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 750 | desc->src = imxdmac->per_address; |
| 751 | } else { |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 752 | desc->dest = imxdmac->per_address; |
| 753 | } |
| 754 | desc->desc.callback = NULL; |
| 755 | desc->desc.callback_param = NULL; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 756 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 757 | return &desc->desc; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 758 | } |
| 759 | |
| 760 | static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic( |
| 761 | struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, |
Alexandre Bounine | 185ecb5 | 2012-03-08 15:35:13 -0500 | [diff] [blame] | 762 | size_t period_len, enum dma_transfer_direction direction, |
| 763 | void *context) |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 764 | { |
| 765 | struct imxdma_channel *imxdmac = to_imxdma_chan(chan); |
| 766 | struct imxdma_engine *imxdma = imxdmac->imxdma; |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 767 | struct imxdma_desc *desc; |
| 768 | int i; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 769 | unsigned int periods = buf_len / period_len; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 770 | |
| 771 | dev_dbg(imxdma->dev, "%s channel: %d buf_len=%d period_len=%d\n", |
| 772 | __func__, imxdmac->channel, buf_len, period_len); |
| 773 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 774 | if (list_empty(&imxdmac->ld_free) || |
| 775 | imxdma_chan_is_doing_cyclic(imxdmac)) |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 776 | return NULL; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 777 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 778 | desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 779 | |
| 780 | if (imxdmac->sg_list) |
| 781 | kfree(imxdmac->sg_list); |
| 782 | |
| 783 | imxdmac->sg_list = kcalloc(periods + 1, |
| 784 | sizeof(struct scatterlist), GFP_KERNEL); |
| 785 | if (!imxdmac->sg_list) |
| 786 | return NULL; |
| 787 | |
| 788 | sg_init_table(imxdmac->sg_list, periods); |
| 789 | |
| 790 | for (i = 0; i < periods; i++) { |
| 791 | imxdmac->sg_list[i].page_link = 0; |
| 792 | imxdmac->sg_list[i].offset = 0; |
| 793 | imxdmac->sg_list[i].dma_address = dma_addr; |
| 794 | imxdmac->sg_list[i].length = period_len; |
| 795 | dma_addr += period_len; |
| 796 | } |
| 797 | |
| 798 | /* close the loop */ |
| 799 | imxdmac->sg_list[periods].offset = 0; |
| 800 | imxdmac->sg_list[periods].length = 0; |
| 801 | imxdmac->sg_list[periods].page_link = |
| 802 | ((unsigned long)imxdmac->sg_list | 0x01) & ~0x02; |
| 803 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 804 | desc->type = IMXDMA_DESC_CYCLIC; |
| 805 | desc->sg = imxdmac->sg_list; |
| 806 | desc->sgcount = periods; |
| 807 | desc->len = IMX_DMA_LENGTH_LOOP; |
Javier Martin | 2efc344 | 2012-03-22 14:54:03 +0100 | [diff] [blame] | 808 | desc->direction = direction; |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 809 | if (direction == DMA_DEV_TO_MEM) { |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 810 | desc->src = imxdmac->per_address; |
| 811 | } else { |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 812 | desc->dest = imxdmac->per_address; |
| 813 | } |
| 814 | desc->desc.callback = NULL; |
| 815 | desc->desc.callback_param = NULL; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 816 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 817 | return &desc->desc; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 818 | } |
| 819 | |
Javier Martin | 6c05f09 | 2012-02-28 17:08:17 +0100 | [diff] [blame] | 820 | static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy( |
| 821 | struct dma_chan *chan, dma_addr_t dest, |
| 822 | dma_addr_t src, size_t len, unsigned long flags) |
| 823 | { |
| 824 | struct imxdma_channel *imxdmac = to_imxdma_chan(chan); |
| 825 | struct imxdma_engine *imxdma = imxdmac->imxdma; |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 826 | struct imxdma_desc *desc; |
Javier Martin | 6c05f09 | 2012-02-28 17:08:17 +0100 | [diff] [blame] | 827 | |
| 828 | dev_dbg(imxdma->dev, "%s channel: %d src=0x%x dst=0x%x len=%d\n", |
| 829 | __func__, imxdmac->channel, src, dest, len); |
| 830 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 831 | if (list_empty(&imxdmac->ld_free) || |
| 832 | imxdma_chan_is_doing_cyclic(imxdmac)) |
Javier Martin | 6c05f09 | 2012-02-28 17:08:17 +0100 | [diff] [blame] | 833 | return NULL; |
| 834 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 835 | desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); |
Javier Martin | 6c05f09 | 2012-02-28 17:08:17 +0100 | [diff] [blame] | 836 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 837 | desc->type = IMXDMA_DESC_MEMCPY; |
| 838 | desc->src = src; |
| 839 | desc->dest = dest; |
| 840 | desc->len = len; |
Javier Martin | 2efc344 | 2012-03-22 14:54:03 +0100 | [diff] [blame] | 841 | desc->direction = DMA_MEM_TO_MEM; |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 842 | desc->config_port = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR; |
| 843 | desc->config_mem = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR; |
| 844 | desc->desc.callback = NULL; |
| 845 | desc->desc.callback_param = NULL; |
| 846 | |
| 847 | return &desc->desc; |
Javier Martin | 6c05f09 | 2012-02-28 17:08:17 +0100 | [diff] [blame] | 848 | } |
| 849 | |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 850 | static void imxdma_issue_pending(struct dma_chan *chan) |
| 851 | { |
Sascha Hauer | 5b31687 | 2012-01-09 10:32:49 +0100 | [diff] [blame] | 852 | struct imxdma_channel *imxdmac = to_imxdma_chan(chan); |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 853 | struct imxdma_engine *imxdma = imxdmac->imxdma; |
| 854 | struct imxdma_desc *desc; |
| 855 | unsigned long flags; |
Sascha Hauer | 5b31687 | 2012-01-09 10:32:49 +0100 | [diff] [blame] | 856 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 857 | spin_lock_irqsave(&imxdmac->lock, flags); |
| 858 | if (list_empty(&imxdmac->ld_active) && |
| 859 | !list_empty(&imxdmac->ld_queue)) { |
| 860 | desc = list_first_entry(&imxdmac->ld_queue, |
| 861 | struct imxdma_desc, node); |
| 862 | |
| 863 | if (imxdma_xfer_desc(desc) < 0) { |
| 864 | dev_warn(imxdma->dev, |
| 865 | "%s: channel: %d couldn't issue DMA xfer\n", |
| 866 | __func__, imxdmac->channel); |
| 867 | } else { |
| 868 | list_move_tail(imxdmac->ld_queue.next, |
| 869 | &imxdmac->ld_active); |
| 870 | } |
| 871 | } |
| 872 | spin_unlock_irqrestore(&imxdmac->lock, flags); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 873 | } |
| 874 | |
| 875 | static int __init imxdma_probe(struct platform_device *pdev) |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 876 | { |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 877 | struct imxdma_engine *imxdma; |
| 878 | int ret, i; |
| 879 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 880 | if (cpu_is_mx1()) |
| 881 | imx_dmav1_baseaddr = MX1_IO_ADDRESS(MX1_DMA_BASE_ADDR); |
| 882 | else if (cpu_is_mx21()) |
| 883 | imx_dmav1_baseaddr = MX21_IO_ADDRESS(MX21_DMA_BASE_ADDR); |
| 884 | else if (cpu_is_mx27()) |
| 885 | imx_dmav1_baseaddr = MX27_IO_ADDRESS(MX27_DMA_BASE_ADDR); |
| 886 | else |
| 887 | return 0; |
| 888 | |
| 889 | dma_clk = clk_get(NULL, "dma"); |
| 890 | if (IS_ERR(dma_clk)) |
| 891 | return PTR_ERR(dma_clk); |
| 892 | clk_enable(dma_clk); |
| 893 | |
| 894 | /* reset DMA module */ |
| 895 | imx_dmav1_writel(DCR_DRST, DMA_DCR); |
| 896 | |
| 897 | if (cpu_is_mx1()) { |
| 898 | ret = request_irq(MX1_DMA_INT, dma_irq_handler, 0, "DMA", imxdma); |
| 899 | if (ret) { |
| 900 | pr_crit("Can't register IRQ for DMA\n"); |
| 901 | return ret; |
| 902 | } |
| 903 | |
| 904 | ret = request_irq(MX1_DMA_ERR, imxdma_err_handler, 0, "DMA", imxdma); |
| 905 | if (ret) { |
| 906 | pr_crit("Can't register ERRIRQ for DMA\n"); |
| 907 | free_irq(MX1_DMA_INT, NULL); |
| 908 | return ret; |
| 909 | } |
| 910 | } |
| 911 | |
| 912 | /* enable DMA module */ |
| 913 | imx_dmav1_writel(DCR_DEN, DMA_DCR); |
| 914 | |
| 915 | /* clear all interrupts */ |
| 916 | imx_dmav1_writel((1 << IMX_DMA_CHANNELS) - 1, DMA_DISR); |
| 917 | |
| 918 | /* disable interrupts */ |
| 919 | imx_dmav1_writel((1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR); |
| 920 | |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 921 | imxdma = kzalloc(sizeof(*imxdma), GFP_KERNEL); |
| 922 | if (!imxdma) |
| 923 | return -ENOMEM; |
| 924 | |
| 925 | INIT_LIST_HEAD(&imxdma->dma_device.channels); |
| 926 | |
Sascha Hauer | f8a356f | 2011-01-31 11:35:59 +0100 | [diff] [blame] | 927 | dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask); |
| 928 | dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask); |
Javier Martin | 6c05f09 | 2012-02-28 17:08:17 +0100 | [diff] [blame] | 929 | dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask); |
Sascha Hauer | f8a356f | 2011-01-31 11:35:59 +0100 | [diff] [blame] | 930 | |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 931 | /* Initialize channel parameters */ |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 932 | for (i = 0; i < IMX_DMA_CHANNELS; i++) { |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 933 | struct imxdma_channel *imxdmac = &imxdma->channel[i]; |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 934 | memset(&imxdmac->internal, 0, sizeof(imxdmac->internal)); |
| 935 | if (cpu_is_mx21() || cpu_is_mx27()) { |
| 936 | ret = request_irq(MX2x_INT_DMACH0 + i, |
| 937 | dma_irq_handler, 0, "DMA", imxdma); |
| 938 | if (ret) { |
| 939 | pr_crit("Can't register IRQ %d for DMA channel %d\n", |
| 940 | MX2x_INT_DMACH0 + i, i); |
| 941 | goto err_init; |
| 942 | } |
| 943 | init_timer(&imxdmac->internal.watchdog); |
| 944 | imxdmac->internal.watchdog.function = &imxdma_watchdog; |
| 945 | imxdmac->internal.watchdog.data = (unsigned long)imxdmac; |
Sascha Hauer | 8267f16 | 2010-10-20 08:37:19 +0200 | [diff] [blame] | 946 | } |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 947 | |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 948 | imxdmac->imxdma = imxdma; |
| 949 | spin_lock_init(&imxdmac->lock); |
| 950 | |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 951 | INIT_LIST_HEAD(&imxdmac->ld_queue); |
| 952 | INIT_LIST_HEAD(&imxdmac->ld_free); |
| 953 | INIT_LIST_HEAD(&imxdmac->ld_active); |
| 954 | |
| 955 | tasklet_init(&imxdmac->dma_tasklet, imxdma_tasklet, |
| 956 | (unsigned long)imxdmac); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 957 | imxdmac->chan.device = &imxdma->dma_device; |
Russell King - ARM Linux | 8ac6954 | 2012-03-06 22:36:27 +0000 | [diff] [blame] | 958 | dma_cookie_init(&imxdmac->chan); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 959 | imxdmac->channel = i; |
| 960 | |
| 961 | /* Add the channel to the DMAC list */ |
Javier Martin | 9e15db7 | 2012-03-02 09:28:47 +0100 | [diff] [blame] | 962 | list_add_tail(&imxdmac->chan.device_node, |
| 963 | &imxdma->dma_device.channels); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 964 | } |
| 965 | |
| 966 | imxdma->dev = &pdev->dev; |
| 967 | imxdma->dma_device.dev = &pdev->dev; |
| 968 | |
| 969 | imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources; |
| 970 | imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources; |
| 971 | imxdma->dma_device.device_tx_status = imxdma_tx_status; |
| 972 | imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg; |
| 973 | imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic; |
Javier Martin | 6c05f09 | 2012-02-28 17:08:17 +0100 | [diff] [blame] | 974 | imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy; |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 975 | imxdma->dma_device.device_control = imxdma_control; |
| 976 | imxdma->dma_device.device_issue_pending = imxdma_issue_pending; |
| 977 | |
| 978 | platform_set_drvdata(pdev, imxdma); |
| 979 | |
Javier Martin | 6c05f09 | 2012-02-28 17:08:17 +0100 | [diff] [blame] | 980 | imxdma->dma_device.copy_align = 2; /* 2^2 = 4 bytes alignment */ |
Sascha Hauer | 1e070a6 | 2011-01-12 13:14:37 +0100 | [diff] [blame] | 981 | imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms; |
| 982 | dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff); |
| 983 | |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 984 | ret = dma_async_device_register(&imxdma->dma_device); |
| 985 | if (ret) { |
| 986 | dev_err(&pdev->dev, "unable to register\n"); |
| 987 | goto err_init; |
| 988 | } |
| 989 | |
| 990 | return 0; |
| 991 | |
| 992 | err_init: |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 993 | |
| 994 | if (cpu_is_mx21() || cpu_is_mx27()) { |
| 995 | while (--i >= 0) |
| 996 | free_irq(MX2x_INT_DMACH0 + i, NULL); |
| 997 | } else if cpu_is_mx1() { |
| 998 | free_irq(MX1_DMA_INT, NULL); |
| 999 | free_irq(MX1_DMA_ERR, NULL); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 1000 | } |
| 1001 | |
| 1002 | kfree(imxdma); |
| 1003 | return ret; |
| 1004 | } |
| 1005 | |
| 1006 | static int __exit imxdma_remove(struct platform_device *pdev) |
| 1007 | { |
| 1008 | struct imxdma_engine *imxdma = platform_get_drvdata(pdev); |
| 1009 | int i; |
| 1010 | |
| 1011 | dma_async_device_unregister(&imxdma->dma_device); |
| 1012 | |
Javier Martin | 6bd0812 | 2012-03-22 14:54:01 +0100 | [diff] [blame] | 1013 | if (cpu_is_mx21() || cpu_is_mx27()) { |
| 1014 | for (i = 0; i < IMX_DMA_CHANNELS; i++) |
| 1015 | free_irq(MX2x_INT_DMACH0 + i, NULL); |
| 1016 | } else if cpu_is_mx1() { |
| 1017 | free_irq(MX1_DMA_INT, NULL); |
| 1018 | free_irq(MX1_DMA_ERR, NULL); |
Sascha Hauer | 1f1846c | 2010-10-06 10:25:55 +0200 | [diff] [blame] | 1019 | } |
| 1020 | |
| 1021 | kfree(imxdma); |
| 1022 | |
| 1023 | return 0; |
| 1024 | } |
| 1025 | |
| 1026 | static struct platform_driver imxdma_driver = { |
| 1027 | .driver = { |
| 1028 | .name = "imx-dma", |
| 1029 | }, |
| 1030 | .remove = __exit_p(imxdma_remove), |
| 1031 | }; |
| 1032 | |
| 1033 | static int __init imxdma_module_init(void) |
| 1034 | { |
| 1035 | return platform_driver_probe(&imxdma_driver, imxdma_probe); |
| 1036 | } |
| 1037 | subsys_initcall(imxdma_module_init); |
| 1038 | |
| 1039 | MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>"); |
| 1040 | MODULE_DESCRIPTION("i.MX dma driver"); |
| 1041 | MODULE_LICENSE("GPL"); |