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Message-Id: <1350566815-409-6-git-send-email-mporter@ti.com>
Date: Thu, 18 Oct 2012 09:26:44 -0400
From: Matt Porter <mporter@...com>
To: 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>
Cc: 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: [RFC PATCH v3 05/16] ARM: edma: add AM33XX crossbar event support
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@...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;
+
+ 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];
};
--
1.7.9.5
--
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