root/drivers/dma/dw-edma/dw-edma-pcie.c

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DEFINITIONS

This source file includes following definitions.
  1. dw_edma_pcie_probe
  2. dw_edma_pcie_remove

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2018-2019 Synopsys, Inc. and/or its affiliates.
   4  * Synopsys DesignWare eDMA PCIe driver
   5  *
   6  * Author: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
   7  */
   8 
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/pci.h>
  12 #include <linux/device.h>
  13 #include <linux/dma/edma.h>
  14 #include <linux/pci-epf.h>
  15 #include <linux/msi.h>
  16 
  17 #include "dw-edma-core.h"
  18 
  19 struct dw_edma_pcie_data {
  20         /* eDMA registers location */
  21         enum pci_barno                  rg_bar;
  22         off_t                           rg_off;
  23         size_t                          rg_sz;
  24         /* eDMA memory linked list location */
  25         enum pci_barno                  ll_bar;
  26         off_t                           ll_off;
  27         size_t                          ll_sz;
  28         /* eDMA memory data location */
  29         enum pci_barno                  dt_bar;
  30         off_t                           dt_off;
  31         size_t                          dt_sz;
  32         /* Other */
  33         u32                             version;
  34         enum dw_edma_mode               mode;
  35         u8                              irqs;
  36 };
  37 
  38 static const struct dw_edma_pcie_data snps_edda_data = {
  39         /* eDMA registers location */
  40         .rg_bar                         = BAR_0,
  41         .rg_off                         = 0x00001000,   /*  4 Kbytes */
  42         .rg_sz                          = 0x00002000,   /*  8 Kbytes */
  43         /* eDMA memory linked list location */
  44         .ll_bar                         = BAR_2,
  45         .ll_off                         = 0x00000000,   /*  0 Kbytes */
  46         .ll_sz                          = 0x00800000,   /*  8 Mbytes */
  47         /* eDMA memory data location */
  48         .dt_bar                         = BAR_2,
  49         .dt_off                         = 0x00800000,   /*  8 Mbytes */
  50         .dt_sz                          = 0x03800000,   /* 56 Mbytes */
  51         /* Other */
  52         .version                        = 0,
  53         .mode                           = EDMA_MODE_UNROLL,
  54         .irqs                           = 1,
  55 };
  56 
  57 static int dw_edma_pcie_probe(struct pci_dev *pdev,
  58                               const struct pci_device_id *pid)
  59 {
  60         const struct dw_edma_pcie_data *pdata = (void *)pid->driver_data;
  61         struct device *dev = &pdev->dev;
  62         struct dw_edma_chip *chip;
  63         int err, nr_irqs;
  64         struct dw_edma *dw;
  65 
  66         /* Enable PCI device */
  67         err = pcim_enable_device(pdev);
  68         if (err) {
  69                 pci_err(pdev, "enabling device failed\n");
  70                 return err;
  71         }
  72 
  73         /* Mapping PCI BAR regions */
  74         err = pcim_iomap_regions(pdev, BIT(pdata->rg_bar) |
  75                                        BIT(pdata->ll_bar) |
  76                                        BIT(pdata->dt_bar),
  77                                  pci_name(pdev));
  78         if (err) {
  79                 pci_err(pdev, "eDMA BAR I/O remapping failed\n");
  80                 return err;
  81         }
  82 
  83         pci_set_master(pdev);
  84 
  85         /* DMA configuration */
  86         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
  87         if (!err) {
  88                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
  89                 if (err) {
  90                         pci_err(pdev, "consistent DMA mask 64 set failed\n");
  91                         return err;
  92                 }
  93         } else {
  94                 pci_err(pdev, "DMA mask 64 set failed\n");
  95 
  96                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
  97                 if (err) {
  98                         pci_err(pdev, "DMA mask 32 set failed\n");
  99                         return err;
 100                 }
 101 
 102                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
 103                 if (err) {
 104                         pci_err(pdev, "consistent DMA mask 32 set failed\n");
 105                         return err;
 106                 }
 107         }
 108 
 109         /* Data structure allocation */
 110         chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
 111         if (!chip)
 112                 return -ENOMEM;
 113 
 114         dw = devm_kzalloc(dev, sizeof(*dw), GFP_KERNEL);
 115         if (!dw)
 116                 return -ENOMEM;
 117 
 118         /* IRQs allocation */
 119         nr_irqs = pci_alloc_irq_vectors(pdev, 1, pdata->irqs,
 120                                         PCI_IRQ_MSI | PCI_IRQ_MSIX);
 121         if (nr_irqs < 1) {
 122                 pci_err(pdev, "fail to alloc IRQ vector (number of IRQs=%u)\n",
 123                         nr_irqs);
 124                 return -EPERM;
 125         }
 126 
 127         /* Data structure initialization */
 128         chip->dw = dw;
 129         chip->dev = dev;
 130         chip->id = pdev->devfn;
 131         chip->irq = pdev->irq;
 132 
 133         dw->rg_region.vaddr = pcim_iomap_table(pdev)[pdata->rg_bar];
 134         dw->rg_region.vaddr += pdata->rg_off;
 135         dw->rg_region.paddr = pdev->resource[pdata->rg_bar].start;
 136         dw->rg_region.paddr += pdata->rg_off;
 137         dw->rg_region.sz = pdata->rg_sz;
 138 
 139         dw->ll_region.vaddr = pcim_iomap_table(pdev)[pdata->ll_bar];
 140         dw->ll_region.vaddr += pdata->ll_off;
 141         dw->ll_region.paddr = pdev->resource[pdata->ll_bar].start;
 142         dw->ll_region.paddr += pdata->ll_off;
 143         dw->ll_region.sz = pdata->ll_sz;
 144 
 145         dw->dt_region.vaddr = pcim_iomap_table(pdev)[pdata->dt_bar];
 146         dw->dt_region.vaddr += pdata->dt_off;
 147         dw->dt_region.paddr = pdev->resource[pdata->dt_bar].start;
 148         dw->dt_region.paddr += pdata->dt_off;
 149         dw->dt_region.sz = pdata->dt_sz;
 150 
 151         dw->version = pdata->version;
 152         dw->mode = pdata->mode;
 153         dw->nr_irqs = nr_irqs;
 154 
 155         /* Debug info */
 156         pci_dbg(pdev, "Version:\t%u\n", dw->version);
 157 
 158         pci_dbg(pdev, "Mode:\t%s\n",
 159                 dw->mode == EDMA_MODE_LEGACY ? "Legacy" : "Unroll");
 160 
 161         pci_dbg(pdev, "Registers:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
 162                 pdata->rg_bar, pdata->rg_off, pdata->rg_sz,
 163                 dw->rg_region.vaddr, &dw->rg_region.paddr);
 164 
 165         pci_dbg(pdev, "L. List:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
 166                 pdata->ll_bar, pdata->ll_off, pdata->ll_sz,
 167                 dw->ll_region.vaddr, &dw->ll_region.paddr);
 168 
 169         pci_dbg(pdev, "Data:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
 170                 pdata->dt_bar, pdata->dt_off, pdata->dt_sz,
 171                 dw->dt_region.vaddr, &dw->dt_region.paddr);
 172 
 173         pci_dbg(pdev, "Nr. IRQs:\t%u\n", dw->nr_irqs);
 174 
 175         /* Validating if PCI interrupts were enabled */
 176         if (!pci_dev_msi_enabled(pdev)) {
 177                 pci_err(pdev, "enable interrupt failed\n");
 178                 return -EPERM;
 179         }
 180 
 181         dw->irq = devm_kcalloc(dev, nr_irqs, sizeof(*dw->irq), GFP_KERNEL);
 182         if (!dw->irq)
 183                 return -ENOMEM;
 184 
 185         /* Starting eDMA driver */
 186         err = dw_edma_probe(chip);
 187         if (err) {
 188                 pci_err(pdev, "eDMA probe failed\n");
 189                 return err;
 190         }
 191 
 192         /* Saving data structure reference */
 193         pci_set_drvdata(pdev, chip);
 194 
 195         return 0;
 196 }
 197 
 198 static void dw_edma_pcie_remove(struct pci_dev *pdev)
 199 {
 200         struct dw_edma_chip *chip = pci_get_drvdata(pdev);
 201         int err;
 202 
 203         /* Stopping eDMA driver */
 204         err = dw_edma_remove(chip);
 205         if (err)
 206                 pci_warn(pdev, "can't remove device properly: %d\n", err);
 207 
 208         /* Freeing IRQs */
 209         pci_free_irq_vectors(pdev);
 210 }
 211 
 212 static const struct pci_device_id dw_edma_pcie_id_table[] = {
 213         { PCI_DEVICE_DATA(SYNOPSYS, EDDA, &snps_edda_data) },
 214         { }
 215 };
 216 MODULE_DEVICE_TABLE(pci, dw_edma_pcie_id_table);
 217 
 218 static struct pci_driver dw_edma_pcie_driver = {
 219         .name           = "dw-edma-pcie",
 220         .id_table       = dw_edma_pcie_id_table,
 221         .probe          = dw_edma_pcie_probe,
 222         .remove         = dw_edma_pcie_remove,
 223 };
 224 
 225 module_pci_driver(dw_edma_pcie_driver);
 226 
 227 MODULE_LICENSE("GPL v2");
 228 MODULE_DESCRIPTION("Synopsys DesignWare eDMA PCIe driver");
 229 MODULE_AUTHOR("Gustavo Pimentel <gustavo.pimentel@synopsys.com>");

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