Re: [PATCH v5 03/14] ARM: edma: add AM33XX support to the private EDMA API

Matt Porter
2013-01-31T01:30:43Z

On Wed, Jan 30, 2013 at 09:40:52AM +0200, Andy Shevchenko wrote:
> On Wed, Jan 30, 2013 at 8:41 AM, Matt Porter <mporter@ti.com> wrote:
> > On Mon, Jan 28, 2013 at 09:27:24PM +0200, Andy Shevchenko wrote:
> >> On Tue, Jan 15, 2013 at 10:32 PM, Matt Porter <mporter@ti.com> wrote:
> >> > Adds support for parsing the TI EDMA DT data into the required
> >> > EDMA private API platform data. Enables runtime PM support to
> >> > initialize the EDMA hwmod. Adds AM33XX EMDA crossbar event mux
> >> > support.
> >> >
> >> > Signed-off-by: Matt Porter <mporter@ti.com>
> >> > ---
> >> > arch/arm/common/edma.c | 314 ++++++++++++++++++++++++++++++++++--
> >> > include/linux/platform_data/edma.h | 1 +
> >> > 2 files changed, 306 insertions(+), 9 deletions(-)
> >> >
> >> > diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
> >> > index 2dce245..beeb1d2 100644
> >> > --- a/arch/arm/common/edma.c
> >> > +++ b/arch/arm/common/edma.c
> >> > @@ -24,6 +24,13 @@
> >> > #include <linux/platform_device.h>
> >> > #include <linux/io.h>
> >> > #include <linux/slab.h>
> >> > +#include <linux/edma.h>
> >> > +#include <linux/err.h>
> >> > +#include <linux/of_address.h>
> >> > +#include <linux/of_device.h>
> >> > +#include <linux/of_dma.h>
> >> > +#include <linux/of_irq.h>
> >> > +#include <linux/pm_runtime.h>
> >> >
> >> > #include <linux/platform_data/edma.h>
> >> >
> >> > @@ -723,6 +730,9 @@ EXPORT_SYMBOL(edma_free_channel);
> >> > */
> >> > int edma_alloc_slot(unsigned ctlr, int slot)
> >> > {
> >> > + if (!edma_cc[ctlr])
> >> > + return -EINVAL;
> >> > +
> >> > if (slot >= 0)
> >> > slot = EDMA_CHAN_SLOT(slot);
> >> >
> >> > @@ -1366,31 +1376,291 @@ void edma_clear_event(unsigned channel)
> >> > EXPORT_SYMBOL(edma_clear_event);
> >> >
> >> > /*-----------------------------------------------------------------------*/
> >> > +static int edma_of_read_u32_to_s8_array(const struct device_node *np,
> >> > + const char *propname, s8 *out_values,
> >> > + size_t sz)
> >>
> >> I'm sorry I didn't get why you couldn't use of_property_read_u8_array() ?
> >> The similar comment to u16 and so on.
> >
> > There's some manipulation of the legacy Davinci platform data
> > structures going on here. The driving reason was to not change any of
> > the davinci platforms pdata which uses s8/s16 tables of mapping values
> > with signed values as terminators. These versions below add the
> > convert to the signed value and terminate the array as needed by the
> > existing driver. This will all go away when the driver is rewritten and
> > merged into drivers/dma/edma.c. At that point I want to throwaway all
> > these legacy data structures. First, there's some more drivers to
> > convert to dmaengine api.
> >
>
> I mean instead of custom functions you could use existing ones.
> And sign here will be implicitly applied.

Yes, sorry, wasn't following you at first. The is definitely much better
and does work fine. I will update this...thanks!

-Matt

> So, what I propose is to do something like this
>
> static int edma_of_read_u32_to_s8_array(const struct device_node *np,
> const char *propname, s8 *out_values,
> size_t sz)
> {
>
> int ret;
> ret = of_property_read_u8_array(np, propname, out_values, sz);
> if (ret)
> return ret;
>
> /* Terminate it */
> *out_values++ = -1;
> *out_values++ = -1;
> }
>
> > -Matt
> >>
> >> > +{
> >> > + struct property *prop = of_find_property(np, propname, NULL);
> >> > + const __be32 *val;
> >> > +
> >> > + if (!prop)
> >> > + return -EINVAL;
> >> > + if (!prop->value)
> >> > + return -ENODATA;
> >> > + if ((sz * sizeof(u32)) > prop->length)
> >> > + return -EOVERFLOW;
> >> > +
> >> > + val = prop->value;
> >> > +
> >> > + while (sz--)
> >> > + *out_values++ = (s8)(be32_to_cpup(val++) & 0xff);
> >> > +
> >> > + /* Terminate it */
> >> > + *out_values++ = -1;
> >> > + *out_values++ = -1;
> >> > +
> >> > + return 0;
> >> > +}
> >> > +
> >> > +static int edma_of_read_u32_to_s16_array(const struct device_node *np,
> >> > + const char *propname, s16 *out_values,
> >> > + size_t sz)
> >> > +{
> >> > + struct property *prop = of_find_property(np, propname, NULL);
> >> > + const __be32 *val;
> >> > +
> >> > + if (!prop)
> >> > + return -EINVAL;
> >> > + if (!prop->value)
> >> > + return -ENODATA;
> >> > + if ((sz * sizeof(u32)) > prop->length)
> >> > + return -EOVERFLOW;
> >> > +
> >> > + val = prop->value;
> >> > +
> >> > + while (sz--)
> >> > + *out_values++ = (s16)(be32_to_cpup(val++) & 0xffff);
> >> > +
> >> > + /* Terminate it */
> >> > + *out_values++ = -1;
> >> > + *out_values++ = -1;
> >> > +
> >> > + 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;
> >> > + const 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 -ENOMEM;
> >> > +
> >> > + 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 = readl((void *)((u32)xbar + offset));
> >> > + mux &= ~(0xff << shift);
> >> > + mux |= xbar_chans[i][0] << shift;
> >> > + 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)
> >> > +{
> >> > + int ret = 0;
> >> > + u32 value;
> >> > + struct property *prop;
> >> > + size_t sz;
> >> > + struct edma_rsv_info *rsv_info;
> >> > + const s16 (*rsv_chans)[2], (*rsv_slots)[2];
> >> > + const s8 (*queue_tc_map)[2], (*queue_priority_map)[2];
> >> > +
> >> > + memset(pdata, 0, sizeof(struct edma_soc_info));
> >> > +
> >> > + ret = of_property_read_u32(node, "dma-channels", &value);
> >> > + if (ret < 0)
> >> > + return ret;
> >> > + pdata->n_channel = value;
> >> > +
> >> > + ret = of_property_read_u32(node, "ti,edma-regions", &value);
> >> > + if (ret < 0)
> >> > + return ret;
> >> > + pdata->n_region = value;
> >> > +
> >> > + ret = of_property_read_u32(node, "ti,edma-slots", &value);
> >> > + if (ret < 0)
> >> > + return ret;
> >> > + pdata->n_slot = value;
> >> > +
> >> > + pdata->n_cc = 1;
> >> > + pdata->n_tc = 3;
> >> > +
> >> > + rsv_info =
> >> > + devm_kzalloc(dev, sizeof(struct edma_rsv_info), GFP_KERNEL);
> >> > + if (!rsv_info)
> >> > + return -ENOMEM;
> >> > + pdata->rsv = rsv_info;
> >> > +
> >> > + /* Build the reserved channel/slots arrays */
> >> > + prop = of_find_property(node, "ti,edma-reserved-channels", &sz);
> >> > + if (prop) {
> >> > + rsv_chans = devm_kzalloc(dev,
> >> > + sz/sizeof(s16) + 2*sizeof(s16),
> >> > + GFP_KERNEL);
> >> > + if (!rsv_chans)
> >> > + return -ENOMEM;
> >> > + pdata->rsv->rsv_chans = rsv_chans;
> >> > +
> >> > + ret = edma_of_read_u32_to_s16_array(node,
> >> > + "ti,edma-reserved-channels",
> >> > + (s16 *)rsv_chans,
> >> > + sz/sizeof(u32));
> >> > + if (ret < 0)
> >> > + return ret;
> >> > + }
> >> > +
> >> > + prop = of_find_property(node, "ti,edma-reserved-slots", &sz);
> >> > + if (prop) {
> >> > + rsv_slots = devm_kzalloc(dev,
> >> > + sz/sizeof(s16) + 2*sizeof(s16),
> >> > + GFP_KERNEL);
> >> > + if (!rsv_slots)
> >> > + return -ENOMEM;
> >> > + pdata->rsv->rsv_slots = rsv_slots;
> >> > +
> >> > + ret = edma_of_read_u32_to_s16_array(node,
> >> > + "ti,edma-reserved-slots",
> >> > + (s16 *)rsv_slots,
> >> > + sz/sizeof(u32));
> >> > + if (ret < 0)
> >> > + return ret;
> >> > + }
> >> > +
> >> > + prop = of_find_property(node, "ti,edma-queue-tc-map", &sz);
> >> > + if (!prop)
> >> > + return -EINVAL;
> >> > +
> >> > + queue_tc_map = devm_kzalloc(dev,
> >> > + sz/sizeof(s8) + 2*sizeof(s8),
> >> > + GFP_KERNEL);
> >> > + if (!queue_tc_map)
> >> > + return -ENOMEM;
> >> > + pdata->queue_tc_mapping = queue_tc_map;
> >> > +
> >> > + ret = edma_of_read_u32_to_s8_array(node,
> >> > + "ti,edma-queue-tc-map",
> >> > + (s8 *)queue_tc_map,
> >> > + sz/sizeof(u32));
> >> > + if (ret < 0)
> >> > + return ret;
> >> > +
> >> > + prop = of_find_property(node, "ti,edma-queue-priority-map", &sz);
> >> > + if (!prop)
> >> > + return -EINVAL;
> >> > +
> >> > + queue_priority_map = devm_kzalloc(dev,
> >> > + sz/sizeof(s8) + 2*sizeof(s8),
> >> > + GFP_KERNEL);
> >> > + if (!queue_priority_map)
> >> > + return -ENOMEM;
> >> > + pdata->queue_priority_mapping = queue_priority_map;
> >> > +
> >> > + ret = edma_of_read_u32_to_s8_array(node,
> >> > + "ti,edma-queue-tc-map",
> >> > + (s8 *)queue_priority_map,
> >> > + sz/sizeof(u32));
> >> > + if (ret < 0)
> >> > + return ret;
> >> > +
> >> > + ret = of_property_read_u32(node, "ti,edma-default-queue", &value);
> >> > + if (ret < 0)
> >> > + 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;
> >> > +}
> >> > +
> >> > +static struct of_dma_filter_info edma_filter_info = {
> >> > + .filter_fn = edma_filter_fn,
> >> > +};
> >> >
> >> > static int edma_probe(struct platform_device *pdev)
> >> > {
> >> > struct edma_soc_info **info = pdev->dev.platform_data;
> >> > + struct edma_soc_info *ninfo[EDMA_MAX_CC] = {NULL, NULL};
> >> > + struct edma_soc_info tmpinfo;
> >> > const s8 (*queue_priority_mapping)[2];
> >> > const s8 (*queue_tc_mapping)[2];
> >> > int i, j, off, ln, found = 0;
> >> > int status = -1;
> >> > const s16 (*rsv_chans)[2];
> >> > const s16 (*rsv_slots)[2];
> >> > + const 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};
> >> > + struct resource *r[EDMA_MAX_CC] = {NULL, NULL};
> >> > + struct resource res[EDMA_MAX_CC];
> >> > resource_size_t len[EDMA_MAX_CC];
> >> > char res_name[10];
> >> > char irq_name[10];
> >> > + struct device_node *node = pdev->dev.of_node;
> >> > + struct device *dev = &pdev->dev;
> >> > + int ret;
> >> > +
> >> > + if (node) {
> >> > + info = ninfo;
> >> > + edma_of_parse_dt(dev, node, &tmpinfo);
> >> > + info[0] = &tmpinfo;
> >> > +
> >> > + dma_cap_set(DMA_SLAVE, edma_filter_info.dma_cap);
> >> > + of_dma_controller_register(dev->of_node,
> >> > + of_dma_simple_xlate,
> >> > + &edma_filter_info);
> >> > + }
> >> >
> >> > if (!info)
> >> > return -ENODEV;
> >> >
> >> > + pm_runtime_enable(dev);
> >> > + ret = pm_runtime_get_sync(dev);
> >> > + if (IS_ERR_VALUE(ret)) {
> >> > + dev_err(dev, "pm_runtime_get_sync() failed\n");
> >> > + return ret;
> >> > + }
> >> > +
> >> > for (j = 0; j < EDMA_MAX_CC; j++) {
> >> > - sprintf(res_name, "edma_cc%d", j);
> >> > - r[j] = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> >> > + if (!info[j]) {
> >> > + if (!found)
> >> > + return -ENODEV;
> >> > + break;
> >> > + }
> >> > + if (node) {
> >> > + ret = of_address_to_resource(node, j, &res[j]);
> >> > + if (!IS_ERR_VALUE(ret))
> >> > + r[j] = &res[j];
> >> > + } else {
> >> > + sprintf(res_name, "edma_cc%d", j);
> >> > + r[j] = platform_get_resource_byname(pdev,
> >> > + IORESOURCE_MEM,
> >> > res_name);
> >> > - if (!r[j] || !info[j]) {
> >> > + }
> >> > + if (!r[j]) {
> >> > if (found)
> >> > break;
> >> > else
> >> > @@ -1465,8 +1735,22 @@ static int edma_probe(struct platform_device *pdev)
> >> > }
> >> > }
> >> >
> >> > - sprintf(irq_name, "edma%d", j);
> >> > - irq[j] = platform_get_irq_byname(pdev, irq_name);
> >> > + /* 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 {
> >> > + sprintf(irq_name, "edma%d", j);
> >> > + irq[j] = platform_get_irq_byname(pdev, irq_name);
> >> > + }
> >> > edma_cc[j]->irq_res_start = irq[j];
> >> > status = request_irq(irq[j], dma_irq_handler, 0, "edma",
> >> > &pdev->dev);
> >> > @@ -1476,8 +1760,12 @@ static int edma_probe(struct platform_device *pdev)
> >> > goto fail;
> >> > }
> >> >
> >> > - sprintf(irq_name, "edma%d_err", j);
> >> > - err_irq[j] = platform_get_irq_byname(pdev, irq_name);
> >> > + if (node)
> >> > + err_irq[j] = irq_of_parse_and_map(node, 2);
> >> > + else {
> >> > + sprintf(irq_name, "edma%d_err", j);
> >> > + err_irq[j] = platform_get_irq_byname(pdev, irq_name);
> >> > + }
> >> > edma_cc[j]->irq_res_end = err_irq[j];
> >> > status = request_irq(err_irq[j], dma_ccerr_handler, 0,
> >> > "edma_error", &pdev->dev);
> >> > @@ -1538,9 +1826,17 @@ fail1:
> >> > return status;
> >> > }
> >> >
> >> > +static const struct of_device_id edma_of_ids[] = {
> >> > + { .compatible = "ti,edma3", },
> >> > + {}
> >> > +};
> >> >
> >> > static struct platform_driver edma_driver = {
> >> > - .driver.name = "edma",
> >> > + .driver = {
> >> > + .name = "edma",
> >> > + .of_match_table = edma_of_ids,
> >> > + },
> >> > + .probe = edma_probe,
> >> > };
> >> >
> >> > static int __init edma_init(void)
> >> > diff --git a/include/linux/platform_data/edma.h b/include/linux/platform_data/edma.h
> >> > index 2344ea2..ffc1fb2 100644
> >> > --- a/include/linux/platform_data/edma.h
> >> > +++ b/include/linux/platform_data/edma.h
> >> > @@ -177,6 +177,7 @@ struct edma_soc_info {
> >> >
> >> > const s8 (*queue_tc_mapping)[2];
> >> > const s8 (*queue_priority_mapping)[2];
> >> > + const s16 (*xbar_chans)[2];
> >> > };
> >> >
> >> > #endif
> >> > --
> >> > 1.7.9.5
> >> >
> >> > --
> >> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> >> > the body of a message to majordomo@vger.kernel.org
> >> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> >> > Please read the FAQ at http://www.tux.org/lkml/
> >>
> >>
> >>
> >> --
> >> With Best Regards,
> >> Andy Shevchenko
> >> --
> >> To unsubscribe from this list: send the line "unsubscribe linux-omap" in
> >> the body of a message to majordomo@vger.kernel.org
> >> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
>
>
> --
> With Best Regards,
> Andy Shevchenko
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