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