Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753209Ab3FRGjZ (ORCPT ); Tue, 18 Jun 2013 02:39:25 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:42913 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752201Ab3FRGjR (ORCPT ); Tue, 18 Jun 2013 02:39:17 -0400 From: Joel A Fernandes To: Tony Lindgren , Sekhar Nori , Matt Porter , Grant Likely , Rob Herring , Vinod Koul , Mark Brown , Benoit Cousson , Russell King , Rob Landley , Andrew Morton , Jason Kridner , Koen Kooi 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 , Joel A Fernandes Subject: [PATCH v11 3/8] ARM: edma: Add EDMA crossbar event mux support Date: Tue, 18 Jun 2013 01:38:14 -0500 Message-ID: <1371537499-12970-4-git-send-email-joelagnel@ti.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1371537499-12970-1-git-send-email-joelagnel@ti.com> References: <1371537499-12970-1-git-send-email-joelagnel@ti.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3592 Lines: 129 From: Matt Porter Changes by Joel: * Split EDMA xbar support out of original EDMA DT parsing patch to keep it easier for review. * Rewrite shift and offset calculation. Suggested-by: Sekhar Nori Suggested by: Andy Shevchenko Signed-off-by: Joel A Fernandes Reference: [1] https://patchwork.kernel.org/patch/2226991/ --- arch/arm/common/edma.c | 59 ++++++++++++++++++++++++++++++++++++ include/linux/platform_data/edma.h | 1 + 2 files changed, 60 insertions(+) diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c index 9823b79..1c2fb15 100644 --- a/arch/arm/common/edma.c +++ b/arch/arm/common/edma.c @@ -1410,6 +1410,52 @@ 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; + 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 (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 (ret) + return -EIO; + + for (i = 0; xbar_chans[i][0] != -1; i++) { + shift = (xbar_chans[i][1] & 0x03) << 3; + offset = xbar_chans[i][1] & 0xfffffffc; + 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) @@ -1470,6 +1516,9 @@ static int edma_of_parse_dt(struct device *dev, pdata->default_queue = 0; + prop = of_find_property(node, "ti,edma-xbar-event-map", &sz); + if (prop) + ret = edma_xbar_event_map(dev, node, pdata, sz); return ret; } @@ -1489,6 +1538,7 @@ static int edma_probe(struct platform_device *pdev) 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, NULL}; @@ -1617,6 +1667,15 @@ static int 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); diff --git a/include/linux/platform_data/edma.h b/include/linux/platform_data/edma.h index 317f2be..57300fd 100644 --- a/include/linux/platform_data/edma.h +++ b/include/linux/platform_data/edma.h @@ -177,6 +177,7 @@ struct edma_soc_info { s8 (*queue_tc_mapping)[2]; 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/