summaryrefslogtreecommitdiffstats
path: root/drivers/dma/dw-edma/dw-edma-pcie.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/dma/dw-edma/dw-edma-pcie.c')
-rw-r--r--drivers/dma/dw-edma/dw-edma-pcie.c378
1 files changed, 378 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 0000000000..1c6043751d
--- /dev/null
+++ b/drivers/dma/dw-edma/dw-edma-pcie.c
@@ -0,0 +1,378 @@
+// 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 <linux/bitfield.h>
+
+#include "dw-edma-core.h"
+
+#define DW_PCIE_VSEC_DMA_ID 0x6
+#define DW_PCIE_VSEC_DMA_BAR GENMASK(10, 8)
+#define DW_PCIE_VSEC_DMA_MAP GENMASK(2, 0)
+#define DW_PCIE_VSEC_DMA_WR_CH GENMASK(9, 0)
+#define DW_PCIE_VSEC_DMA_RD_CH GENMASK(25, 16)
+
+#define DW_BLOCK(a, b, c) \
+ { \
+ .bar = a, \
+ .off = b, \
+ .sz = c, \
+ },
+
+struct dw_edma_block {
+ enum pci_barno bar;
+ off_t off;
+ size_t sz;
+};
+
+struct dw_edma_pcie_data {
+ /* eDMA registers location */
+ struct dw_edma_block rg;
+ /* eDMA memory linked list location */
+ struct dw_edma_block ll_wr[EDMA_MAX_WR_CH];
+ struct dw_edma_block ll_rd[EDMA_MAX_RD_CH];
+ /* eDMA memory data location */
+ struct dw_edma_block dt_wr[EDMA_MAX_WR_CH];
+ struct dw_edma_block dt_rd[EDMA_MAX_RD_CH];
+ /* Other */
+ enum dw_edma_map_format mf;
+ u8 irqs;
+ u16 wr_ch_cnt;
+ u16 rd_ch_cnt;
+};
+
+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_wr = {
+ /* Channel 0 - BAR 2, offset 0 Mbytes, size 2 Kbytes */
+ DW_BLOCK(BAR_2, 0x00000000, 0x00000800)
+ /* Channel 1 - BAR 2, offset 2 Mbytes, size 2 Kbytes */
+ DW_BLOCK(BAR_2, 0x00200000, 0x00000800)
+ },
+ .ll_rd = {
+ /* Channel 0 - BAR 2, offset 4 Mbytes, size 2 Kbytes */
+ DW_BLOCK(BAR_2, 0x00400000, 0x00000800)
+ /* Channel 1 - BAR 2, offset 6 Mbytes, size 2 Kbytes */
+ DW_BLOCK(BAR_2, 0x00600000, 0x00000800)
+ },
+ /* eDMA memory data location */
+ .dt_wr = {
+ /* Channel 0 - BAR 2, offset 8 Mbytes, size 2 Kbytes */
+ DW_BLOCK(BAR_2, 0x00800000, 0x00000800)
+ /* Channel 1 - BAR 2, offset 9 Mbytes, size 2 Kbytes */
+ DW_BLOCK(BAR_2, 0x00900000, 0x00000800)
+ },
+ .dt_rd = {
+ /* Channel 0 - BAR 2, offset 10 Mbytes, size 2 Kbytes */
+ DW_BLOCK(BAR_2, 0x00a00000, 0x00000800)
+ /* Channel 1 - BAR 2, offset 11 Mbytes, size 2 Kbytes */
+ DW_BLOCK(BAR_2, 0x00b00000, 0x00000800)
+ },
+ /* Other */
+ .mf = EDMA_MF_EDMA_UNROLL,
+ .irqs = 1,
+ .wr_ch_cnt = 2,
+ .rd_ch_cnt = 2,
+};
+
+static int dw_edma_pcie_irq_vector(struct device *dev, unsigned int nr)
+{
+ return pci_irq_vector(to_pci_dev(dev), nr);
+}
+
+static u64 dw_edma_pcie_address(struct device *dev, phys_addr_t cpu_addr)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct pci_bus_region region;
+ struct resource res = {
+ .flags = IORESOURCE_MEM,
+ .start = cpu_addr,
+ .end = cpu_addr,
+ };
+
+ pcibios_resource_to_bus(pdev->bus, &region, &res);
+ return region.start;
+}
+
+static const struct dw_edma_plat_ops dw_edma_pcie_plat_ops = {
+ .irq_vector = dw_edma_pcie_irq_vector,
+ .pci_address = dw_edma_pcie_address,
+};
+
+static void dw_edma_pcie_get_vsec_dma_data(struct pci_dev *pdev,
+ struct dw_edma_pcie_data *pdata)
+{
+ u32 val, map;
+ u16 vsec;
+ u64 off;
+
+ vsec = pci_find_vsec_capability(pdev, PCI_VENDOR_ID_SYNOPSYS,
+ DW_PCIE_VSEC_DMA_ID);
+ if (!vsec)
+ return;
+
+ pci_read_config_dword(pdev, vsec + PCI_VNDR_HEADER, &val);
+ if (PCI_VNDR_HEADER_REV(val) != 0x00 ||
+ PCI_VNDR_HEADER_LEN(val) != 0x18)
+ return;
+
+ pci_dbg(pdev, "Detected PCIe Vendor-Specific Extended Capability DMA\n");
+ pci_read_config_dword(pdev, vsec + 0x8, &val);
+ map = FIELD_GET(DW_PCIE_VSEC_DMA_MAP, val);
+ if (map != EDMA_MF_EDMA_LEGACY &&
+ map != EDMA_MF_EDMA_UNROLL &&
+ map != EDMA_MF_HDMA_COMPAT)
+ return;
+
+ pdata->mf = map;
+ pdata->rg.bar = FIELD_GET(DW_PCIE_VSEC_DMA_BAR, val);
+
+ pci_read_config_dword(pdev, vsec + 0xc, &val);
+ pdata->wr_ch_cnt = min_t(u16, pdata->wr_ch_cnt,
+ FIELD_GET(DW_PCIE_VSEC_DMA_WR_CH, val));
+ pdata->rd_ch_cnt = min_t(u16, pdata->rd_ch_cnt,
+ FIELD_GET(DW_PCIE_VSEC_DMA_RD_CH, val));
+
+ pci_read_config_dword(pdev, vsec + 0x14, &val);
+ off = val;
+ pci_read_config_dword(pdev, vsec + 0x10, &val);
+ off <<= 32;
+ off |= val;
+ pdata->rg.off = off;
+}
+
+static int dw_edma_pcie_probe(struct pci_dev *pdev,
+ const struct pci_device_id *pid)
+{
+ struct dw_edma_pcie_data *pdata = (void *)pid->driver_data;
+ struct dw_edma_pcie_data vsec_data;
+ struct device *dev = &pdev->dev;
+ struct dw_edma_chip *chip;
+ int err, nr_irqs;
+ int i, mask;
+
+ /* Enable PCI device */
+ err = pcim_enable_device(pdev);
+ if (err) {
+ pci_err(pdev, "enabling device failed\n");
+ return err;
+ }
+
+ memcpy(&vsec_data, pdata, sizeof(struct dw_edma_pcie_data));
+
+ /*
+ * Tries to find if exists a PCIe Vendor-Specific Extended Capability
+ * for the DMA, if one exists, then reconfigures it.
+ */
+ dw_edma_pcie_get_vsec_dma_data(pdev, &vsec_data);
+
+ /* Mapping PCI BAR regions */
+ mask = BIT(vsec_data.rg.bar);
+ for (i = 0; i < vsec_data.wr_ch_cnt; i++) {
+ mask |= BIT(vsec_data.ll_wr[i].bar);
+ mask |= BIT(vsec_data.dt_wr[i].bar);
+ }
+ for (i = 0; i < vsec_data.rd_ch_cnt; i++) {
+ mask |= BIT(vsec_data.ll_rd[i].bar);
+ mask |= BIT(vsec_data.dt_rd[i].bar);
+ }
+ err = pcim_iomap_regions(pdev, mask, pci_name(pdev));
+ if (err) {
+ pci_err(pdev, "eDMA BAR I/O remapping failed\n");
+ return err;
+ }
+
+ pci_set_master(pdev);
+
+ /* DMA configuration */
+ err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+ if (err) {
+ pci_err(pdev, "DMA mask 64 set failed\n");
+ return err;
+ }
+
+ /* Data structure allocation */
+ chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ /* IRQs allocation */
+ nr_irqs = pci_alloc_irq_vectors(pdev, 1, vsec_data.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->dev = dev;
+
+ chip->mf = vsec_data.mf;
+ chip->nr_irqs = nr_irqs;
+ chip->ops = &dw_edma_pcie_plat_ops;
+
+ chip->ll_wr_cnt = vsec_data.wr_ch_cnt;
+ chip->ll_rd_cnt = vsec_data.rd_ch_cnt;
+
+ chip->reg_base = pcim_iomap_table(pdev)[vsec_data.rg.bar];
+ if (!chip->reg_base)
+ return -ENOMEM;
+
+ for (i = 0; i < chip->ll_wr_cnt; i++) {
+ struct dw_edma_region *ll_region = &chip->ll_region_wr[i];
+ struct dw_edma_region *dt_region = &chip->dt_region_wr[i];
+ struct dw_edma_block *ll_block = &vsec_data.ll_wr[i];
+ struct dw_edma_block *dt_block = &vsec_data.dt_wr[i];
+
+ ll_region->vaddr.io = pcim_iomap_table(pdev)[ll_block->bar];
+ if (!ll_region->vaddr.io)
+ return -ENOMEM;
+
+ ll_region->vaddr.io += ll_block->off;
+ ll_region->paddr = pci_bus_address(pdev, ll_block->bar);
+ ll_region->paddr += ll_block->off;
+ ll_region->sz = ll_block->sz;
+
+ dt_region->vaddr.io = pcim_iomap_table(pdev)[dt_block->bar];
+ if (!dt_region->vaddr.io)
+ return -ENOMEM;
+
+ dt_region->vaddr.io += dt_block->off;
+ dt_region->paddr = pci_bus_address(pdev, dt_block->bar);
+ dt_region->paddr += dt_block->off;
+ dt_region->sz = dt_block->sz;
+ }
+
+ for (i = 0; i < chip->ll_rd_cnt; i++) {
+ struct dw_edma_region *ll_region = &chip->ll_region_rd[i];
+ struct dw_edma_region *dt_region = &chip->dt_region_rd[i];
+ struct dw_edma_block *ll_block = &vsec_data.ll_rd[i];
+ struct dw_edma_block *dt_block = &vsec_data.dt_rd[i];
+
+ ll_region->vaddr.io = pcim_iomap_table(pdev)[ll_block->bar];
+ if (!ll_region->vaddr.io)
+ return -ENOMEM;
+
+ ll_region->vaddr.io += ll_block->off;
+ ll_region->paddr = pci_bus_address(pdev, ll_block->bar);
+ ll_region->paddr += ll_block->off;
+ ll_region->sz = ll_block->sz;
+
+ dt_region->vaddr.io = pcim_iomap_table(pdev)[dt_block->bar];
+ if (!dt_region->vaddr.io)
+ return -ENOMEM;
+
+ dt_region->vaddr.io += dt_block->off;
+ dt_region->paddr = pci_bus_address(pdev, dt_block->bar);
+ dt_region->paddr += dt_block->off;
+ dt_region->sz = dt_block->sz;
+ }
+
+ /* Debug info */
+ if (chip->mf == EDMA_MF_EDMA_LEGACY)
+ pci_dbg(pdev, "Version:\teDMA Port Logic (0x%x)\n", chip->mf);
+ else if (chip->mf == EDMA_MF_EDMA_UNROLL)
+ pci_dbg(pdev, "Version:\teDMA Unroll (0x%x)\n", chip->mf);
+ else if (chip->mf == EDMA_MF_HDMA_COMPAT)
+ pci_dbg(pdev, "Version:\tHDMA Compatible (0x%x)\n", chip->mf);
+ else
+ pci_dbg(pdev, "Version:\tUnknown (0x%x)\n", chip->mf);
+
+ pci_dbg(pdev, "Registers:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p)\n",
+ vsec_data.rg.bar, vsec_data.rg.off, vsec_data.rg.sz,
+ chip->reg_base);
+
+
+ for (i = 0; i < chip->ll_wr_cnt; i++) {
+ pci_dbg(pdev, "L. List:\tWRITE CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
+ i, vsec_data.ll_wr[i].bar,
+ vsec_data.ll_wr[i].off, chip->ll_region_wr[i].sz,
+ chip->ll_region_wr[i].vaddr.io, &chip->ll_region_wr[i].paddr);
+
+ pci_dbg(pdev, "Data:\tWRITE CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
+ i, vsec_data.dt_wr[i].bar,
+ vsec_data.dt_wr[i].off, chip->dt_region_wr[i].sz,
+ chip->dt_region_wr[i].vaddr.io, &chip->dt_region_wr[i].paddr);
+ }
+
+ for (i = 0; i < chip->ll_rd_cnt; i++) {
+ pci_dbg(pdev, "L. List:\tREAD CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
+ i, vsec_data.ll_rd[i].bar,
+ vsec_data.ll_rd[i].off, chip->ll_region_rd[i].sz,
+ chip->ll_region_rd[i].vaddr.io, &chip->ll_region_rd[i].paddr);
+
+ pci_dbg(pdev, "Data:\tREAD CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
+ i, vsec_data.dt_rd[i].bar,
+ vsec_data.dt_rd[i].off, chip->dt_region_rd[i].sz,
+ chip->dt_region_rd[i].vaddr.io, &chip->dt_region_rd[i].paddr);
+ }
+
+ pci_dbg(pdev, "Nr. IRQs:\t%u\n", chip->nr_irqs);
+
+ /* Validating if PCI interrupts were enabled */
+ if (!pci_dev_msi_enabled(pdev)) {
+ pci_err(pdev, "enable interrupt failed\n");
+ return -EPERM;
+ }
+
+ /* 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>");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 06:51:57 +0000