drivers/dma/mcf-edma.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // Copyright (c) 2013-2014 Freescale Semiconductor, Inc
   4 // Copyright (c) 2017 Sysam, Angelo Dureghello  <angelo@sysam.it>
   5
   6 #include <linux/module.h>
   7 #include <linux/interrupt.h>
   8 #include <linux/dmaengine.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/platform_data/dma-mcf-edma.h>
  11
  12 #include "fsl-edma-common.h"
  13
  14 #define EDMA_CHANNELS           64
  15 #define EDMA_MASK_CH(x)         ((x) & GENMASK(5, 0))
  16
  17 static irqreturn_t mcf_edma_tx_handler(int irq, void *dev_id)
  18 {
  19         struct fsl_edma_engine *mcf_edma = dev_id;
  20         struct edma_regs *regs = &mcf_edma->regs;
  21         unsigned int ch;
  22         struct fsl_edma_chan *mcf_chan;
  23         u64 intmap;
  24
  25         intmap = ioread32(regs->inth);
  26         intmap <<= 32;
  27         intmap |= ioread32(regs->intl);
  28         if (!intmap)
  29                 return IRQ_NONE;
  30
  31         for (ch = 0; ch < mcf_edma->n_chans; ch++) {
  32                 if (intmap & BIT(ch)) {
  33                         iowrite8(EDMA_MASK_CH(ch), regs->cint);
  34
  35                         mcf_chan = &mcf_edma->chans[ch];
  36
  37                         spin_lock(&mcf_chan->vchan.lock);
  38
  39                         if (!mcf_chan->edesc) {
  40                                 /* terminate_all called before */
  41                                 spin_unlock(&mcf_chan->vchan.lock);
  42                                 continue;
  43                         }
  44
  45                         if (!mcf_chan->edesc->iscyclic) {
  46                                 list_del(&mcf_chan->edesc->vdesc.node);
  47                                 vchan_cookie_complete(&mcf_chan->edesc->vdesc);
  48                                 mcf_chan->edesc = NULL;
  49                                 mcf_chan->status = DMA_COMPLETE;
  50                                 mcf_chan->idle = true;
  51                         } else {
  52                                 vchan_cyclic_callback(&mcf_chan->edesc->vdesc);
  53                         }
  54
  55                         if (!mcf_chan->edesc)
  56                                 fsl_edma_xfer_desc(mcf_chan);
  57
  58                         spin_unlock(&mcf_chan->vchan.lock);
  59                 }
  60         }
  61
  62         return IRQ_HANDLED;
  63 }
  64
  65 static irqreturn_t mcf_edma_err_handler(int irq, void *dev_id)
  66 {
  67         struct fsl_edma_engine *mcf_edma = dev_id;
  68         struct edma_regs *regs = &mcf_edma->regs;
  69         unsigned int err, ch;
  70
  71         err = ioread32(regs->errl);
  72         if (!err)
  73                 return IRQ_NONE;
  74
  75         for (ch = 0; ch < (EDMA_CHANNELS / 2); ch++) {
  76                 if (err & BIT(ch)) {
  77                         fsl_edma_disable_request(&mcf_edma->chans[ch]);
  78                         iowrite8(EDMA_CERR_CERR(ch), regs->cerr);
  79                         mcf_edma->chans[ch].status = DMA_ERROR;
  80                         mcf_edma->chans[ch].idle = true;
  81                 }
  82         }
  83
  84         err = ioread32(regs->errh);
  85         if (!err)
  86                 return IRQ_NONE;
  87
  88         for (ch = (EDMA_CHANNELS / 2); ch < EDMA_CHANNELS; ch++) {
  89                 if (err & (BIT(ch - (EDMA_CHANNELS / 2)))) {
  90                         fsl_edma_disable_request(&mcf_edma->chans[ch]);
  91                         iowrite8(EDMA_CERR_CERR(ch), regs->cerr);
  92                         mcf_edma->chans[ch].status = DMA_ERROR;
  93                         mcf_edma->chans[ch].idle = true;
  94                 }
  95         }
  96
  97         return IRQ_HANDLED;
  98 }
  99
 100 static int mcf_edma_irq_init(struct platform_device *pdev,
 101                                 struct fsl_edma_engine *mcf_edma)
 102 {
 103         int ret = 0, i;
 104         struct resource *res;
 105
 106         res = platform_get_resource_byname(pdev,
 107                                 IORESOURCE_IRQ, "edma-tx-00-15");
 108         if (!res)
 109                 return -1;
 110
 111         for (ret = 0, i = res->start; i <= res->end; ++i)
 112                 ret |= request_irq(i, mcf_edma_tx_handler, 0, "eDMA", mcf_edma);
 113         if (ret)
 114                 return ret;
 115
 116         res = platform_get_resource_byname(pdev,
 117                         IORESOURCE_IRQ, "edma-tx-16-55");
 118         if (!res)
 119                 return -1;
 120
 121         for (ret = 0, i = res->start; i <= res->end; ++i)
 122                 ret |= request_irq(i, mcf_edma_tx_handler, 0, "eDMA", mcf_edma);
 123         if (ret)
 124                 return ret;
 125
 126         ret = platform_get_irq_byname(pdev, "edma-tx-56-63");
 127         if (ret != -ENXIO) {
 128                 ret = request_irq(ret, mcf_edma_tx_handler,
 129                                   0, "eDMA", mcf_edma);
 130                 if (ret)
 131                         return ret;
 132         }
 133
 134         ret = platform_get_irq_byname(pdev, "edma-err");
 135         if (ret != -ENXIO) {
 136                 ret = request_irq(ret, mcf_edma_err_handler,
 137                                   0, "eDMA", mcf_edma);
 138                 if (ret)
 139                         return ret;
 140         }
 141
 142         return 0;
 143 }
 144
 145 static void mcf_edma_irq_free(struct platform_device *pdev,
 146                                 struct fsl_edma_engine *mcf_edma)
 147 {
 148         int irq;
 149         struct resource *res;
 150
 151         res = platform_get_resource_byname(pdev,
 152                         IORESOURCE_IRQ, "edma-tx-00-15");
 153         if (res) {
 154                 for (irq = res->start; irq <= res->end; irq++)
 155                         free_irq(irq, mcf_edma);
 156         }
 157
 158         res = platform_get_resource_byname(pdev,
 159                         IORESOURCE_IRQ, "edma-tx-16-55");
 160         if (res) {
 161                 for (irq = res->start; irq <= res->end; irq++)
 162                         free_irq(irq, mcf_edma);
 163         }
 164
 165         irq = platform_get_irq_byname(pdev, "edma-tx-56-63");
 166         if (irq != -ENXIO)
 167                 free_irq(irq, mcf_edma);
 168
 169         irq = platform_get_irq_byname(pdev, "edma-err");
 170         if (irq != -ENXIO)
 171                 free_irq(irq, mcf_edma);
 172 }
 173
 174 static struct fsl_edma_drvdata mcf_data = {
 175         .version = v2,
 176         .setup_irq = mcf_edma_irq_init,
 177 };
 178
 179 static int mcf_edma_probe(struct platform_device *pdev)
 180 {
 181         struct mcf_edma_platform_data *pdata;
 182         struct fsl_edma_engine *mcf_edma;
 183         struct fsl_edma_chan *mcf_chan;
 184         struct edma_regs *regs;
 185         int ret, i, len, chans;
 186
 187         pdata = dev_get_platdata(&pdev->dev);
 188         if (!pdata) {
 189                 dev_err(&pdev->dev, "no platform data supplied\n");
 190                 return -EINVAL;
 191         }
 192
 193         if (!pdata->dma_channels) {
 194                 dev_info(&pdev->dev, "setting default channel number to 64");
 195                 chans = 64;
 196         } else {
 197                 chans = pdata->dma_channels;
 198         }
 199
 200         len = sizeof(*mcf_edma) + sizeof(*mcf_chan) * chans;
 201         mcf_edma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
 202         if (!mcf_edma)
 203                 return -ENOMEM;
 204
 205         mcf_edma->n_chans = chans;
 206
 207         /* Set up drvdata for ColdFire edma */
 208         mcf_edma->drvdata = &mcf_data;
 209         mcf_edma->big_endian = 1;
 210
 211         mutex_init(&mcf_edma->fsl_edma_mutex);
 212
 213         mcf_edma->membase = devm_platform_ioremap_resource(pdev, 0);
 214         if (IS_ERR(mcf_edma->membase))
 215                 return PTR_ERR(mcf_edma->membase);
 216
 217         fsl_edma_setup_regs(mcf_edma);
 218         regs = &mcf_edma->regs;
 219
 220         INIT_LIST_HEAD(&mcf_edma->dma_dev.channels);
 221         for (i = 0; i < mcf_edma->n_chans; i++) {
 222                 struct fsl_edma_chan *mcf_chan = &mcf_edma->chans[i];
 223
 224                 mcf_chan->edma = mcf_edma;
 225                 mcf_chan->slave_id = i;
 226                 mcf_chan->idle = true;
 227                 mcf_chan->dma_dir = DMA_NONE;
 228                 mcf_chan->vchan.desc_free = fsl_edma_free_desc;
 229                 vchan_init(&mcf_chan->vchan, &mcf_edma->dma_dev);
 230                 iowrite32(0x0, &regs->tcd[i].csr);
 231         }
 232
 233         iowrite32(~0, regs->inth);
 234         iowrite32(~0, regs->intl);
 235
 236         ret = mcf_edma->drvdata->setup_irq(pdev, mcf_edma);
 237         if (ret)
 238                 return ret;
 239
 240         dma_cap_set(DMA_PRIVATE, mcf_edma->dma_dev.cap_mask);
 241         dma_cap_set(DMA_SLAVE, mcf_edma->dma_dev.cap_mask);
 242         dma_cap_set(DMA_CYCLIC, mcf_edma->dma_dev.cap_mask);
 243
 244         mcf_edma->dma_dev.dev = &pdev->dev;
 245         mcf_edma->dma_dev.device_alloc_chan_resources =
 246                         fsl_edma_alloc_chan_resources;
 247         mcf_edma->dma_dev.device_free_chan_resources =
 248                         fsl_edma_free_chan_resources;
 249         mcf_edma->dma_dev.device_config = fsl_edma_slave_config;
 250         mcf_edma->dma_dev.device_prep_dma_cyclic =
 251                         fsl_edma_prep_dma_cyclic;
 252         mcf_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg;
 253         mcf_edma->dma_dev.device_tx_status = fsl_edma_tx_status;
 254         mcf_edma->dma_dev.device_pause = fsl_edma_pause;
 255         mcf_edma->dma_dev.device_resume = fsl_edma_resume;
 256         mcf_edma->dma_dev.device_terminate_all = fsl_edma_terminate_all;
 257         mcf_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending;
 258
 259         mcf_edma->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS;
 260         mcf_edma->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS;
 261         mcf_edma->dma_dev.directions =
 262                         BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 263
 264         mcf_edma->dma_dev.filter.fn = mcf_edma_filter_fn;
 265         mcf_edma->dma_dev.filter.map = pdata->slave_map;
 266         mcf_edma->dma_dev.filter.mapcnt = pdata->slavecnt;
 267
 268         platform_set_drvdata(pdev, mcf_edma);
 269
 270         ret = dma_async_device_register(&mcf_edma->dma_dev);
 271         if (ret) {
 272                 dev_err(&pdev->dev,
 273                         "Can't register Freescale eDMA engine. (%d)\n", ret);
 274                 return ret;
 275         }
 276
 277         /* Enable round robin arbitration */
 278         iowrite32(EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
 279
 280         return 0;
 281 }
 282
 283 static int mcf_edma_remove(struct platform_device *pdev)
 284 {
 285         struct fsl_edma_engine *mcf_edma = platform_get_drvdata(pdev);
 286
 287         mcf_edma_irq_free(pdev, mcf_edma);
 288         fsl_edma_cleanup_vchan(&mcf_edma->dma_dev);
 289         dma_async_device_unregister(&mcf_edma->dma_dev);
 290
 291         return 0;
 292 }
 293
 294 static struct platform_driver mcf_edma_driver = {
 295         .driver         = {
 296                 .name   = "mcf-edma",
 297         },
 298         .probe          = mcf_edma_probe,
 299         .remove         = mcf_edma_remove,
 300 };
 301
 302 bool mcf_edma_filter_fn(struct dma_chan *chan, void *param)
 303 {
 304         if (chan->device->dev->driver == &mcf_edma_driver.driver) {
 305                 struct fsl_edma_chan *mcf_chan = to_fsl_edma_chan(chan);
 306
 307                 return (mcf_chan->slave_id == (uintptr_t)param);
 308         }
 309
 310         return false;
 311 }
 312 EXPORT_SYMBOL(mcf_edma_filter_fn);
 313
 314 static int __init mcf_edma_init(void)
 315 {
 316         return platform_driver_register(&mcf_edma_driver);
 317 }
 318 subsys_initcall(mcf_edma_init);
 319
 320 static void __exit mcf_edma_exit(void)
 321 {
 322         platform_driver_unregister(&mcf_edma_driver);
 323 }
 324 module_exit(mcf_edma_exit);
 325
 326 MODULE_ALIAS("platform:mcf-edma");
 327 MODULE_DESCRIPTION("Freescale eDMA engine driver, ColdFire family");
 328 MODULE_LICENSE("GPL v2");