| Message ID | 824396752ee40c8e4222fddb4a80408646989c17.1549482066.git-series.maxime.ripard@bootlin.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | sunxi: Add DT representation for the MBUS controller | expand |
On Wed, Feb 6, 2019 at 1:42 PM Maxime Ripard <maxime.ripard@bootlin.com> wrote: > > Some SoCs have devices that are using a separate bus from the main bus to > perform DMA. > > These buses might have some restrictions and/or different mapping than from > the CPU side, so we'd need to express those using the usual dma-ranges, but > using a different DT node than the node's parent. > > Add support for a dma-parent property that links to the DMA bus used by the > device in such a case. ?? dma-parent is gone now, right? And I see #dma-parent-cells? Rob
On Wed, Feb 06, 2019 at 02:57:51PM -0600, Rob Herring wrote: > On Wed, Feb 6, 2019 at 1:42 PM Maxime Ripard <maxime.ripard@bootlin.com> wrote: > > > > Some SoCs have devices that are using a separate bus from the main bus to > > perform DMA. > > > > These buses might have some restrictions and/or different mapping than from > > the CPU side, so we'd need to express those using the usual dma-ranges, but > > using a different DT node than the node's parent. > > > > Add support for a dma-parent property that links to the DMA bus used by the > > device in such a case. > > ?? dma-parent is gone now, right? And I see #dma-parent-cells? Urgh, right... I forgot to update the commit log, I'll resend it. Maxime
diff --git a/drivers/of/address.c b/drivers/of/address.c index 4c5dc21c71ca..0e9d87a664f5 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -583,8 +583,8 @@ static u64 __of_translate_address(struct device_node *dev, /* Increase refcount at current level */ of_node_get(dev); + *host = NULL; if (!parent) { - *host = NULL; /* Get parent & match bus type */ parent = of_get_parent(dev); if (parent == NULL) @@ -678,12 +678,34 @@ u64 of_translate_address(struct device_node *dev, const __be32 *in_addr) } EXPORT_SYMBOL(of_translate_address); +static struct device_node *__of_get_dma_parent(struct device_node *np) +{ + struct of_phandle_args args; + unsigned int index; + int ret; + + ret = of_property_match_string(np, "interconnect-names", "dma"); + if (ret < 0) + return of_get_parent(np); + + ret = of_parse_phandle_with_args(np, "interconnects", + "#interconnect-cells", + index, &args); + if (ret < 0) + return of_get_parent(np); + + return of_node_get(args.np); +} + u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr) { + struct device_node *parent; struct device_node *host; u64 ret; - ret = __of_translate_address(dev, NULL, in_addr, "dma-ranges", &host); + parent = __of_get_dma_parent(dev); + ret = __of_translate_address(dev, parent, in_addr, "dma-ranges", &host); + of_node_put(parent); if (host) { of_node_put(host); @@ -911,9 +933,15 @@ int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *siz return -EINVAL; while (1) { + struct device_node *parent; + naddr = of_n_addr_cells(node); nsize = of_n_size_cells(node); - node = of_get_next_parent(node); + + parent = __of_get_dma_parent(node); + of_node_put(node); + + node = parent; if (!node) break;
Some SoCs have devices that are using a separate bus from the main bus to perform DMA. These buses might have some restrictions and/or different mapping than from the CPU side, so we'd need to express those using the usual dma-ranges, but using a different DT node than the node's parent. Add support for a dma-parent property that links to the DMA bus used by the device in such a case. Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com> --- drivers/of/address.c | 34 +++++++++++++++++++++++++++++++--- 1 file changed, 31 insertions(+), 3 deletions(-)