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dmaengine: dw-edma: Add PCIe VSEC data retrieval support

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The latest eDMA IP development implements a Vendor-Specific Extended
Capability that contains the eDMA BAR, offset, map format, and the
number of read/write channels available.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Link: https://lore.kernel.org/r/0b880b8893ff457ffc1b5071a1c7f47e61ceea1c.1613674948.git.gustavo.pimentel@synopsys.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Gustavo Pimentel 2021-02-18 20:03:59 +01:00 committed by Vinod Koul
parent c124fd9a96
commit 1aef6ffe99
2 changed files with 98 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/dma/dw-edma/dw-edma-core.c
View File

@ -863,15 +863,19 @@ int dw_edma_probe(struct dw_edma_chip *chip)
raw_spin_lock_init(&dw->lock);
/* Find out how many write channels are supported by hardware */
dw->wr_ch_cnt = dw_edma_v0_core_ch_count(dw, EDMA_DIR_WRITE);
if (!dw->wr_ch_cnt)
return -EINVAL;
if (!dw->wr_ch_cnt) {
/* Find out how many write channels are supported by hardware */
dw->wr_ch_cnt = dw_edma_v0_core_ch_count(dw, EDMA_DIR_WRITE);
if (!dw->wr_ch_cnt)
return -EINVAL;
}
/* Find out how many read channels are supported by hardware */
dw->rd_ch_cnt = dw_edma_v0_core_ch_count(dw, EDMA_DIR_READ);
if (!dw->rd_ch_cnt)
return -EINVAL;
if (!dw->rd_ch_cnt) {
/* Find out how many read channels are supported by hardware */
dw->rd_ch_cnt = dw_edma_v0_core_ch_count(dw, EDMA_DIR_READ);
if (!dw->rd_ch_cnt)
return -EINVAL;
}
dev_vdbg(dev, "Channels:\twrite=%d, read=%d\n",
dw->wr_ch_cnt, dw->rd_ch_cnt);

110
drivers/dma/dw-edma/dw-edma-pcie.c
View File

@ -13,9 +13,16 @@
#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_RD_CH GENMASK(25, 16)
#define DW_PCIE_VSEC_DMA_WR_CH GENMASK(9, 0)
struct dw_edma_pcie_data {
/* eDMA registers location */
enum pci_barno rg_bar;
@ -32,6 +39,8 @@ struct dw_edma_pcie_data {
/* Other */
enum dw_edma_map_format mf;
u8 irqs;
u16 rd_ch_cnt;
u16 wr_ch_cnt;
};
static const struct dw_edma_pcie_data snps_edda_data = {
@ -50,6 +59,8 @@ static const struct dw_edma_pcie_data snps_edda_data = {
/* Other */
.mf = EDMA_MF_EDMA_UNROLL,
.irqs = 1,
.rd_ch_cnt = 0,
.wr_ch_cnt = 0,
};
static int dw_edma_pcie_irq_vector(struct device *dev, unsigned int nr)
@ -61,10 +72,51 @@ static const struct dw_edma_core_ops dw_edma_pcie_core_ops = {
.irq_vector = dw_edma_pcie_irq_vector,
};
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->rd_ch_cnt = FIELD_GET(DW_PCIE_VSEC_DMA_RD_CH, val);
pdata->wr_ch_cnt = FIELD_GET(DW_PCIE_VSEC_DMA_WR_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)
{
const struct dw_edma_pcie_data *pdata = (void *)pid->driver_data;
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;
struct dw_edma *dw;
@ -77,10 +129,18 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
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 */
err = pcim_iomap_regions(pdev, BIT(pdata->rg_bar) |
BIT(pdata->ll_bar) |
BIT(pdata->dt_bar),
err = pcim_iomap_regions(pdev, BIT(vsec_data.rg_bar) |
BIT(vsec_data.ll_bar) |
BIT(vsec_data.dt_bar),
pci_name(pdev));
if (err) {
pci_err(pdev, "eDMA BAR I/O remapping failed\n");
@ -123,7 +183,7 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
return -ENOMEM;
/* IRQs allocation */
nr_irqs = pci_alloc_irq_vectors(pdev, 1, pdata->irqs,
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",
@ -137,27 +197,29 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
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->rg_region.vaddr = pcim_iomap_table(pdev)[vsec_data.rg_bar];
dw->rg_region.vaddr += vsec_data.rg_off;
dw->rg_region.paddr = pdev->resource[vsec_data.rg_bar].start;
dw->rg_region.paddr += vsec_data.rg_off;
dw->rg_region.sz = vsec_data.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->ll_region.vaddr = pcim_iomap_table(pdev)[vsec_data.ll_bar];
dw->ll_region.vaddr += vsec_data.ll_off;
dw->ll_region.paddr = pdev->resource[vsec_data.ll_bar].start;
dw->ll_region.paddr += vsec_data.ll_off;
dw->ll_region.sz = vsec_data.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->dt_region.vaddr = pcim_iomap_table(pdev)[vsec_data.dt_bar];
dw->dt_region.vaddr += vsec_data.dt_off;
dw->dt_region.paddr = pdev->resource[vsec_data.dt_bar].start;
dw->dt_region.paddr += vsec_data.dt_off;
dw->dt_region.sz = vsec_data.dt_sz;
dw->mf = pdata->mf;
dw->mf = vsec_data.mf;
dw->nr_irqs = nr_irqs;
dw->ops = &dw_edma_pcie_core_ops;
dw->rd_ch_cnt = vsec_data.rd_ch_cnt;
dw->wr_ch_cnt = vsec_data.wr_ch_cnt;
/* Debug info */
if (dw->mf == EDMA_MF_EDMA_LEGACY)
@ -170,15 +232,15 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
pci_dbg(pdev, "Version:\tUnknown (0x%x)\n", dw->mf);
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,
vsec_data.rg_bar, vsec_data.rg_off, vsec_data.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,
vsec_data.ll_bar, vsec_data.ll_off, vsec_data.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,
vsec_data.dt_bar, vsec_data.dt_off, vsec_data.dt_sz,
dw->dt_region.vaddr, &dw->dt_region.paddr);
pci_dbg(pdev, "Nr. IRQs:\t%u\n", dw->nr_irqs);