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>"); 230