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