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Message-ID: <CAHp75Vdbv2tSLKY8OpPD7Y2Bf2dL9qn-gG7w=9KxMqL_zPA6sw@mail.gmail.com>
Date: Wed, 30 Jan 2013 09:40:52 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Matt Porter <mporter@...com>
Cc: Tony Lindgren <tony@...mide.com>, Sekhar Nori <nsekhar@...com>,
Grant Likely <grant.likely@...retlab.ca>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Benoit Cousson <b-cousson@...com>,
Russell King <linux@....linux.org.uk>,
Vinod Koul <vinod.koul@...el.com>,
Rob Landley <rob@...dley.net>, Chris Ball <cjb@...top.org>,
Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
Linux OMAP List <linux-omap@...r.kernel.org>,
Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
Linux DaVinci Kernel List
<davinci-linux-open-source@...ux.davincidsp.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux Documentation List <linux-doc@...r.kernel.org>,
Linux MMC List <linux-mmc@...r.kernel.org>,
Linux SPI Devel List
<spi-devel-general@...ts.sourceforge.net>,
Arnd Bergmann <arnd@...db.de>, Dan Williams <djbw@...com>,
Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH v5 03/14] ARM: edma: add AM33XX support to the private
EDMA API
On Wed, Jan 30, 2013 at 8:41 AM, Matt Porter <mporter@...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@...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@...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.
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@...r.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@...r.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
With Best Regards,
Andy Shevchenko
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