| Message ID | 1350566815-409-6-git-send-email-mporter@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Oct 18, 2012 at 18:56:44, Porter, Matt wrote: > Adds support for the per-EDMA channel event mux. This is required > for any peripherals using DMA crossbar mapped events. > > Signed-off-by: Matt Porter <mporter@ti.com> > --- > arch/arm/common/edma.c | 63 +++++++++++++++++++++++++++++++++++- > include/linux/platform_data/edma.h | 1 + > 2 files changed, 63 insertions(+), 1 deletion(-) > ..snip.. ..snip.. > + > + for (i = 0; xbar_chans[i][0] != -1; i++) { > + shift = (xbar_chans[i][1] % 4) * 8; > + offset = xbar_chans[i][1] >> 2; > + offset <<= 2; > + mux = __raw_readl((void *)((u32)xbar + offset)); > + mux &= (~(0xff << shift)); > + mux |= (xbar_chans[i][0] << shift); > + __raw_writel(mux, (void *)((u32)xbar + offset)); This method of calculating Xbar Channel offset has a bug that the code breaks with unaligned access trap error when requested channel to be mapped is odd. This was fixed in Arago tree [1]. Kindly verify > + } > + > + pdata->xbar_chans = xbar_chans; > + > + return 0; > +} > + ..snip.. ..snip.. [1] http://arago-project.org/git/projects/?p=linux-am33x.git;a=commitdiff; h=c08d3cb557adf71c79aeefb38888395455824e83 Regards, Gururaja
On 10/18/2012 6:56 PM, Matt Porter wrote: > Adds support for the per-EDMA channel event mux. This is required > for any peripherals using DMA crossbar mapped events. > > Signed-off-by: Matt Porter <mporter@ti.com> > --- > arch/arm/common/edma.c | 63 +++++++++++++++++++++++++++++++++++- > include/linux/platform_data/edma.h | 1 + > 2 files changed, 63 insertions(+), 1 deletion(-) > > diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c > index 6d2a590..b761b7a 100644 > --- a/arch/arm/common/edma.c > +++ b/arch/arm/common/edma.c > @@ -1425,6 +1425,53 @@ static int edma_of_read_u32_to_s16_array(const struct device_node *np, > return 0; > } > > +static int edma_xbar_event_map(struct device *dev, > + struct device_node *node, > + struct edma_soc_info *pdata, int len) > +{ > + int ret = 0; > + int i; > + struct resource res; > + void *xbar; > + s16 (*xbar_chans)[2]; > + u32 shift, offset, mux; > + > + xbar_chans = devm_kzalloc(dev, > + len/sizeof(s16) + 2*sizeof(s16), > + GFP_KERNEL); > + if (!xbar_chans) > + return -ENOMEM; > + > + ret = of_address_to_resource(node, 1, &res); > + if (IS_ERR_VALUE(ret)) > + return -EIO; > + > + xbar = devm_ioremap(dev, res.start, resource_size(&res)); > + if (!xbar) > + return -EIO; -ENOMEM is more appropiate for ioremap failures. > + > + ret = edma_of_read_u32_to_s16_array(node, > + "ti,edma-xbar-event-map", > + (s16 *)xbar_chans, > + len/sizeof(u32)); > + if (IS_ERR_VALUE(ret)) > + return -EIO; > + > + for (i = 0; xbar_chans[i][0] != -1; i++) { > + shift = (xbar_chans[i][1] % 4) * 8; > + offset = xbar_chans[i][1] >> 2; > + offset <<= 2; > + mux = __raw_readl((void *)((u32)xbar + offset)); Dont use __raw* variants of io accessors. There will be ordering issues on ARMv7. > + mux &= (~(0xff << shift)); > + mux |= (xbar_chans[i][0] << shift); Unnecessary parens above. > + __raw_writel(mux, (void *)((u32)xbar + offset)); > + } > + > + pdata->xbar_chans = xbar_chans; > + > + return 0; > +} > + > static int edma_of_parse_dt(struct device *dev, > struct device_node *node, > struct edma_soc_info *pdata) > @@ -1453,7 +1500,6 @@ static int edma_of_parse_dt(struct device *dev, > pdata->n_slot = value; > > pdata->n_cc = 1; > - /* This is unused */ The comment should have not been part of 4/16? Thanks, Sekhar
On Sun, Oct 28, 2012 at 04:41:24PM +0530, Sekhar Nori wrote: > On 10/18/2012 6:56 PM, Matt Porter wrote: > > Adds support for the per-EDMA channel event mux. This is required > > for any peripherals using DMA crossbar mapped events. > > > > Signed-off-by: Matt Porter <mporter@ti.com> > > --- > > arch/arm/common/edma.c | 63 +++++++++++++++++++++++++++++++++++- > > include/linux/platform_data/edma.h | 1 + > > 2 files changed, 63 insertions(+), 1 deletion(-) > > > > diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c > > index 6d2a590..b761b7a 100644 > > --- a/arch/arm/common/edma.c > > +++ b/arch/arm/common/edma.c > > @@ -1425,6 +1425,53 @@ static int edma_of_read_u32_to_s16_array(const struct device_node *np, > > return 0; > > } > > > > +static int edma_xbar_event_map(struct device *dev, > > + struct device_node *node, > > + struct edma_soc_info *pdata, int len) > > +{ > > + int ret = 0; > > + int i; > > + struct resource res; > > + void *xbar; > > + s16 (*xbar_chans)[2]; > > + u32 shift, offset, mux; > > + > > + xbar_chans = devm_kzalloc(dev, > > + len/sizeof(s16) + 2*sizeof(s16), > > + GFP_KERNEL); > > + if (!xbar_chans) > > + return -ENOMEM; > > + > > + ret = of_address_to_resource(node, 1, &res); > > + if (IS_ERR_VALUE(ret)) > > + return -EIO; > > + > > + xbar = devm_ioremap(dev, res.start, resource_size(&res)); > > + if (!xbar) > > + return -EIO; > > -ENOMEM is more appropiate for ioremap failures. Fixed in v4. > > > + > > + ret = edma_of_read_u32_to_s16_array(node, > > + "ti,edma-xbar-event-map", > > + (s16 *)xbar_chans, > > + len/sizeof(u32)); > > + if (IS_ERR_VALUE(ret)) > > + return -EIO; > > + > > + for (i = 0; xbar_chans[i][0] != -1; i++) { > > + shift = (xbar_chans[i][1] % 4) * 8; > > + offset = xbar_chans[i][1] >> 2; > > + offset <<= 2; > > + mux = __raw_readl((void *)((u32)xbar + offset)); > > Dont use __raw* variants of io accessors. There will be ordering issues > on ARMv7. Fixed in v4. > > > + mux &= (~(0xff << shift)); > > + mux |= (xbar_chans[i][0] << shift); > > Unnecessary parens above. Fixed in v4. > > > + __raw_writel(mux, (void *)((u32)xbar + offset)); > > + } > > + > > + pdata->xbar_chans = xbar_chans; > > + > > + return 0; > > +} > > + > > static int edma_of_parse_dt(struct device *dev, > > struct device_node *node, > > struct edma_soc_info *pdata) > > @@ -1453,7 +1500,6 @@ static int edma_of_parse_dt(struct device *dev, > > pdata->n_slot = value; > > > > pdata->n_cc = 1; > > - /* This is unused */ > > The comment should have not been part of 4/16? Correct. I moved the change to the correct patch in v4. > > Thanks, > Sekhar > _______________________________________________ > Davinci-linux-open-source mailing list > Davinci-linux-open-source@linux.davincidsp.com > http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c index 6d2a590..b761b7a 100644 --- a/arch/arm/common/edma.c +++ b/arch/arm/common/edma.c @@ -1425,6 +1425,53 @@ static int edma_of_read_u32_to_s16_array(const struct device_node *np, return 0; } +static int edma_xbar_event_map(struct device *dev, + struct device_node *node, + struct edma_soc_info *pdata, int len) +{ + int ret = 0; + int i; + struct resource res; + void *xbar; + s16 (*xbar_chans)[2]; + u32 shift, offset, mux; + + xbar_chans = devm_kzalloc(dev, + len/sizeof(s16) + 2*sizeof(s16), + GFP_KERNEL); + if (!xbar_chans) + return -ENOMEM; + + ret = of_address_to_resource(node, 1, &res); + if (IS_ERR_VALUE(ret)) + return -EIO; + + xbar = devm_ioremap(dev, res.start, resource_size(&res)); + if (!xbar) + return -EIO; + + ret = edma_of_read_u32_to_s16_array(node, + "ti,edma-xbar-event-map", + (s16 *)xbar_chans, + len/sizeof(u32)); + if (IS_ERR_VALUE(ret)) + return -EIO; + + for (i = 0; xbar_chans[i][0] != -1; i++) { + shift = (xbar_chans[i][1] % 4) * 8; + offset = xbar_chans[i][1] >> 2; + offset <<= 2; + mux = __raw_readl((void *)((u32)xbar + offset)); + mux &= (~(0xff << shift)); + mux |= (xbar_chans[i][0] << shift); + __raw_writel(mux, (void *)((u32)xbar + offset)); + } + + pdata->xbar_chans = xbar_chans; + + return 0; +} + static int edma_of_parse_dt(struct device *dev, struct device_node *node, struct edma_soc_info *pdata) @@ -1453,7 +1500,6 @@ static int edma_of_parse_dt(struct device *dev, pdata->n_slot = value; pdata->n_cc = 1; - /* This is unused */ pdata->n_tc = 3; rsv_info = @@ -1538,6 +1584,10 @@ static int edma_of_parse_dt(struct device *dev, return ret; pdata->default_queue = value; + prop = of_find_property(node, "ti,edma-xbar-event-map", &sz); + if (prop) + ret = edma_xbar_event_map(dev, node, pdata, sz); + return ret; } @@ -1554,6 +1604,7 @@ static int __init edma_probe(struct platform_device *pdev) int status = -1; s16 (*rsv_chans)[2]; s16 (*rsv_slots)[2]; + s16 (*xbar_chans)[2]; int irq[EDMA_MAX_CC] = {0, 0}; int err_irq[EDMA_MAX_CC] = {0, 0}; struct resource *r[EDMA_MAX_CC] = {NULL, NULL}; @@ -1678,6 +1729,16 @@ static int __init edma_probe(struct platform_device *pdev) } } + /* Clear the xbar mapped channels in unused list */ + xbar_chans = info[j]->xbar_chans; + if (xbar_chans) { + for (i = 0; xbar_chans[i][1] != -1; i++) { + off = xbar_chans[i][1]; + clear_bits(off, 1, + edma_cc[j]->edma_unused); + } + } + if (node) irq[j] = irq_of_parse_and_map(node, 0); else { diff --git a/include/linux/platform_data/edma.h b/include/linux/platform_data/edma.h index b20b586..888a3c6 100644 --- a/include/linux/platform_data/edma.h +++ b/include/linux/platform_data/edma.h @@ -191,6 +191,7 @@ struct edma_soc_info { /* Resource reservation for other cores */ struct edma_rsv_info *rsv; + s16 (*xbar_chans)[2]; s8 (*queue_tc_mapping)[2]; s8 (*queue_priority_mapping)[2]; };
Adds support for the per-EDMA channel event mux. This is required for any peripherals using DMA crossbar mapped events. Signed-off-by: Matt Porter <mporter@ti.com> --- arch/arm/common/edma.c | 63 +++++++++++++++++++++++++++++++++++- include/linux/platform_data/edma.h | 1 + 2 files changed, 63 insertions(+), 1 deletion(-)