Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756077Ab2JRNaS (ORCPT ); Thu, 18 Oct 2012 09:30:18 -0400 Received: from mail-ie0-f174.google.com ([209.85.223.174]:33242 "EHLO mail-ie0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755704Ab2JRNZw (ORCPT ); Thu, 18 Oct 2012 09:25:52 -0400 From: Matt Porter To: Tony Lindgren , Sekhar Nori , Grant Likely , Mark Brown , Benoit Cousson , Russell King , Vinod Koul , Rob Landley , Chris Ball Cc: Devicetree Discuss , Linux OMAP List , Linux ARM Kernel List , Linux DaVinci Kernel List , Linux Kernel Mailing List , Linux Documentation List , Linux MMC List , Linux SPI Devel List , Arnd Bergmann , Dan Williams , Rob Herring Subject: [RFC PATCH v3 05/16] ARM: edma: add AM33XX crossbar event support Date: Thu, 18 Oct 2012 09:26:44 -0400 Message-Id: <1350566815-409-6-git-send-email-mporter@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1350566815-409-1-git-send-email-mporter@ti.com> References: <1350566815-409-1-git-send-email-mporter@ti.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3672 Lines: 131 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 --- 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 -- 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/