240 lines
6.1 KiB
C
240 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2018-2019 Synopsys, Inc. and/or its affiliates.
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* Synopsys DesignWare eDMA PCIe driver
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*
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* Author: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/device.h>
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#include <linux/dma/edma.h>
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#include <linux/pci-epf.h>
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#include <linux/msi.h>
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#include "dw-edma-core.h"
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struct dw_edma_pcie_data {
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/* eDMA registers location */
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enum pci_barno rg_bar;
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off_t rg_off;
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size_t rg_sz;
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/* eDMA memory linked list location */
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enum pci_barno ll_bar;
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off_t ll_off;
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size_t ll_sz;
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/* eDMA memory data location */
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enum pci_barno dt_bar;
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off_t dt_off;
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size_t dt_sz;
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/* Other */
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u32 version;
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enum dw_edma_mode mode;
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u8 irqs;
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};
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static const struct dw_edma_pcie_data snps_edda_data = {
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/* eDMA registers location */
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.rg_bar = BAR_0,
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.rg_off = 0x00001000, /* 4 Kbytes */
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.rg_sz = 0x00002000, /* 8 Kbytes */
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/* eDMA memory linked list location */
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.ll_bar = BAR_2,
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.ll_off = 0x00000000, /* 0 Kbytes */
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.ll_sz = 0x00800000, /* 8 Mbytes */
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/* eDMA memory data location */
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.dt_bar = BAR_2,
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.dt_off = 0x00800000, /* 8 Mbytes */
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.dt_sz = 0x03800000, /* 56 Mbytes */
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/* Other */
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.version = 0,
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.mode = EDMA_MODE_UNROLL,
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.irqs = 1,
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};
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static int dw_edma_pcie_irq_vector(struct device *dev, unsigned int nr)
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{
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return pci_irq_vector(to_pci_dev(dev), nr);
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}
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static const struct dw_edma_core_ops dw_edma_pcie_core_ops = {
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.irq_vector = dw_edma_pcie_irq_vector,
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};
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static int dw_edma_pcie_probe(struct pci_dev *pdev,
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const struct pci_device_id *pid)
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{
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const struct dw_edma_pcie_data *pdata = (void *)pid->driver_data;
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struct device *dev = &pdev->dev;
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struct dw_edma_chip *chip;
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int err, nr_irqs;
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struct dw_edma *dw;
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/* Enable PCI device */
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err = pcim_enable_device(pdev);
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if (err) {
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pci_err(pdev, "enabling device failed\n");
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return err;
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}
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/* Mapping PCI BAR regions */
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err = pcim_iomap_regions(pdev, BIT(pdata->rg_bar) |
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BIT(pdata->ll_bar) |
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BIT(pdata->dt_bar),
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pci_name(pdev));
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if (err) {
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pci_err(pdev, "eDMA BAR I/O remapping failed\n");
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return err;
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}
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pci_set_master(pdev);
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/* DMA configuration */
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err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
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if (!err) {
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err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
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if (err) {
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pci_err(pdev, "consistent DMA mask 64 set failed\n");
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return err;
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}
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} else {
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pci_err(pdev, "DMA mask 64 set failed\n");
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err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
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if (err) {
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pci_err(pdev, "DMA mask 32 set failed\n");
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return err;
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}
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err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
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if (err) {
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pci_err(pdev, "consistent DMA mask 32 set failed\n");
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return err;
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}
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}
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/* Data structure allocation */
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chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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dw = devm_kzalloc(dev, sizeof(*dw), GFP_KERNEL);
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if (!dw)
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return -ENOMEM;
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/* IRQs allocation */
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nr_irqs = pci_alloc_irq_vectors(pdev, 1, pdata->irqs,
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PCI_IRQ_MSI | PCI_IRQ_MSIX);
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if (nr_irqs < 1) {
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pci_err(pdev, "fail to alloc IRQ vector (number of IRQs=%u)\n",
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nr_irqs);
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return -EPERM;
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}
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/* Data structure initialization */
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chip->dw = dw;
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chip->dev = dev;
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chip->id = pdev->devfn;
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chip->irq = pdev->irq;
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dw->rg_region.vaddr = pcim_iomap_table(pdev)[pdata->rg_bar];
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dw->rg_region.vaddr += pdata->rg_off;
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dw->rg_region.paddr = pdev->resource[pdata->rg_bar].start;
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dw->rg_region.paddr += pdata->rg_off;
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dw->rg_region.sz = pdata->rg_sz;
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dw->ll_region.vaddr = pcim_iomap_table(pdev)[pdata->ll_bar];
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dw->ll_region.vaddr += pdata->ll_off;
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dw->ll_region.paddr = pdev->resource[pdata->ll_bar].start;
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dw->ll_region.paddr += pdata->ll_off;
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dw->ll_region.sz = pdata->ll_sz;
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dw->dt_region.vaddr = pcim_iomap_table(pdev)[pdata->dt_bar];
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dw->dt_region.vaddr += pdata->dt_off;
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dw->dt_region.paddr = pdev->resource[pdata->dt_bar].start;
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dw->dt_region.paddr += pdata->dt_off;
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dw->dt_region.sz = pdata->dt_sz;
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dw->version = pdata->version;
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dw->mode = pdata->mode;
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dw->nr_irqs = nr_irqs;
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dw->ops = &dw_edma_pcie_core_ops;
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/* Debug info */
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pci_dbg(pdev, "Version:\t%u\n", dw->version);
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pci_dbg(pdev, "Mode:\t%s\n",
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dw->mode == EDMA_MODE_LEGACY ? "Legacy" : "Unroll");
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pci_dbg(pdev, "Registers:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
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pdata->rg_bar, pdata->rg_off, pdata->rg_sz,
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dw->rg_region.vaddr, &dw->rg_region.paddr);
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pci_dbg(pdev, "L. List:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
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pdata->ll_bar, pdata->ll_off, pdata->ll_sz,
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dw->ll_region.vaddr, &dw->ll_region.paddr);
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pci_dbg(pdev, "Data:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
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pdata->dt_bar, pdata->dt_off, pdata->dt_sz,
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dw->dt_region.vaddr, &dw->dt_region.paddr);
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pci_dbg(pdev, "Nr. IRQs:\t%u\n", dw->nr_irqs);
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/* Validating if PCI interrupts were enabled */
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if (!pci_dev_msi_enabled(pdev)) {
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pci_err(pdev, "enable interrupt failed\n");
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return -EPERM;
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}
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dw->irq = devm_kcalloc(dev, nr_irqs, sizeof(*dw->irq), GFP_KERNEL);
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if (!dw->irq)
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return -ENOMEM;
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/* Starting eDMA driver */
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err = dw_edma_probe(chip);
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if (err) {
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pci_err(pdev, "eDMA probe failed\n");
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return err;
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}
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/* Saving data structure reference */
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pci_set_drvdata(pdev, chip);
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return 0;
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}
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static void dw_edma_pcie_remove(struct pci_dev *pdev)
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{
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struct dw_edma_chip *chip = pci_get_drvdata(pdev);
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int err;
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/* Stopping eDMA driver */
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err = dw_edma_remove(chip);
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if (err)
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pci_warn(pdev, "can't remove device properly: %d\n", err);
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/* Freeing IRQs */
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pci_free_irq_vectors(pdev);
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}
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static const struct pci_device_id dw_edma_pcie_id_table[] = {
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{ PCI_DEVICE_DATA(SYNOPSYS, EDDA, &snps_edda_data) },
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{ }
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};
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MODULE_DEVICE_TABLE(pci, dw_edma_pcie_id_table);
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static struct pci_driver dw_edma_pcie_driver = {
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.name = "dw-edma-pcie",
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.id_table = dw_edma_pcie_id_table,
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.probe = dw_edma_pcie_probe,
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.remove = dw_edma_pcie_remove,
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};
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module_pci_driver(dw_edma_pcie_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Synopsys DesignWare eDMA PCIe driver");
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MODULE_AUTHOR("Gustavo Pimentel <gustavo.pimentel@synopsys.com>");
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