diff options
Diffstat (limited to 'drivers/dma/dw-edma/dw-edma-pcie.c')
| -rw-r--r-- | drivers/dma/dw-edma/dw-edma-pcie.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/drivers/dma/dw-edma/dw-edma-pcie.c b/drivers/dma/dw-edma/dw-edma-pcie.c new file mode 100644 index 000000000..1eafc602e --- /dev/null +++ b/drivers/dma/dw-edma/dw-edma-pcie.c @@ -0,0 +1,239 @@ +// 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_irq_vector(struct device *dev, unsigned int nr) +{ + return pci_irq_vector(to_pci_dev(dev), nr); +} + +static const struct dw_edma_core_ops dw_edma_pcie_core_ops = { + .irq_vector = dw_edma_pcie_irq_vector, +}; + +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; + dw->ops = &dw_edma_pcie_core_ops; + + /* 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>"); |