1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2018-2019 Synopsys, Inc. and/or its affiliates.
4 * Synopsys DesignWare eDMA PCIe driver
6 * Author: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
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>
17 #include "dw-edma-core.h"
19 struct dw_edma_pcie_data {
20 /* eDMA registers location */
21 enum pci_barno rg_bar;
24 /* eDMA memory linked list location */
25 enum pci_barno ll_bar;
28 /* eDMA memory data location */
29 enum pci_barno dt_bar;
34 enum dw_edma_mode mode;
38 static const struct dw_edma_pcie_data snps_edda_data = {
39 /* eDMA registers location */
41 .rg_off = 0x00001000, /* 4 Kbytes */
42 .rg_sz = 0x00002000, /* 8 Kbytes */
43 /* eDMA memory linked list location */
45 .ll_off = 0x00000000, /* 0 Kbytes */
46 .ll_sz = 0x00800000, /* 8 Mbytes */
47 /* eDMA memory data location */
49 .dt_off = 0x00800000, /* 8 Mbytes */
50 .dt_sz = 0x03800000, /* 56 Mbytes */
53 .mode = EDMA_MODE_UNROLL,
57 static int dw_edma_pcie_probe(struct pci_dev *pdev,
58 const struct pci_device_id *pid)
60 const struct dw_edma_pcie_data *pdata = (void *)pid->driver_data;
61 struct device *dev = &pdev->dev;
62 struct dw_edma_chip *chip;
66 /* Enable PCI device */
67 err = pcim_enable_device(pdev);
69 pci_err(pdev, "enabling device failed\n");
73 /* Mapping PCI BAR regions */
74 err = pcim_iomap_regions(pdev, BIT(pdata->rg_bar) |
79 pci_err(pdev, "eDMA BAR I/O remapping failed\n");
85 /* DMA configuration */
86 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
88 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
90 pci_err(pdev, "consistent DMA mask 64 set failed\n");
94 pci_err(pdev, "DMA mask 64 set failed\n");
96 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
98 pci_err(pdev, "DMA mask 32 set failed\n");
102 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
104 pci_err(pdev, "consistent DMA mask 32 set failed\n");
109 /* Data structure allocation */
110 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
114 dw = devm_kzalloc(dev, sizeof(*dw), GFP_KERNEL);
118 /* IRQs allocation */
119 nr_irqs = pci_alloc_irq_vectors(pdev, 1, pdata->irqs,
120 PCI_IRQ_MSI | PCI_IRQ_MSIX);
122 pci_err(pdev, "fail to alloc IRQ vector (number of IRQs=%u)\n",
127 /* Data structure initialization */
130 chip->id = pdev->devfn;
131 chip->irq = pdev->irq;
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;
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;
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;
151 dw->version = pdata->version;
152 dw->mode = pdata->mode;
153 dw->nr_irqs = nr_irqs;
156 pci_dbg(pdev, "Version:\t%u\n", dw->version);
158 pci_dbg(pdev, "Mode:\t%s\n",
159 dw->mode == EDMA_MODE_LEGACY ? "Legacy" : "Unroll");
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);
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);
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);
173 pci_dbg(pdev, "Nr. IRQs:\t%u\n", dw->nr_irqs);
175 /* Validating if PCI interrupts were enabled */
176 if (!pci_dev_msi_enabled(pdev)) {
177 pci_err(pdev, "enable interrupt failed\n");
181 dw->irq = devm_kcalloc(dev, nr_irqs, sizeof(*dw->irq), GFP_KERNEL);
185 /* Starting eDMA driver */
186 err = dw_edma_probe(chip);
188 pci_err(pdev, "eDMA probe failed\n");
192 /* Saving data structure reference */
193 pci_set_drvdata(pdev, chip);
198 static void dw_edma_pcie_remove(struct pci_dev *pdev)
200 struct dw_edma_chip *chip = pci_get_drvdata(pdev);
203 /* Stopping eDMA driver */
204 err = dw_edma_remove(chip);
206 pci_warn(pdev, "can't remove device properly: %d\n", err);
209 pci_free_irq_vectors(pdev);
212 static const struct pci_device_id dw_edma_pcie_id_table[] = {
213 { PCI_DEVICE_DATA(SYNOPSYS, EDDA, &snps_edda_data) },
216 MODULE_DEVICE_TABLE(pci, dw_edma_pcie_id_table);
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,
225 module_pci_driver(dw_edma_pcie_driver);
227 MODULE_LICENSE("GPL v2");
228 MODULE_DESCRIPTION("Synopsys DesignWare eDMA PCIe driver");
229 MODULE_AUTHOR("Gustavo Pimentel <gustavo.pimentel@synopsys.com>");