diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0042-dmaengine-Add-support-for-BCM2708.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0042-dmaengine-Add-support-for-BCM2708.patch | 640 |
1 files changed, 0 insertions, 640 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0042-dmaengine-Add-support-for-BCM2708.patch b/target/linux/bcm27xx/patches-5.4/950-0042-dmaengine-Add-support-for-BCM2708.patch deleted file mode 100644 index f66a4f251a..0000000000 --- a/target/linux/bcm27xx/patches-5.4/950-0042-dmaengine-Add-support-for-BCM2708.patch +++ /dev/null @@ -1,640 +0,0 @@ -From d3751959a74b762e35bb1024e1d33b62b9a97b9b Mon Sep 17 00:00:00 2001 -From: Florian Meier <florian.meier@koalo.de> -Date: Fri, 22 Nov 2013 14:22:53 +0100 -Subject: [PATCH] dmaengine: Add support for BCM2708 -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -Add support for DMA controller of BCM2708 as used in the Raspberry Pi. -Currently it only supports cyclic DMA. - -Signed-off-by: Florian Meier <florian.meier@koalo.de> - -dmaengine: expand functionality by supporting scatter/gather transfers sdhci-bcm2708 and dma.c: fix for LITE channels - -DMA: fix cyclic LITE length overflow bug - -dmaengine: bcm2708: Remove chancnt affectations - -Mirror bcm2835-dma.c commit 9eba5536a7434c69d8c185d4bd1c70734d92287d: -chancnt is already filled by dma_async_device_register, which uses the channel -list to know how much channels there is. - -Since it's already filled, we can safely remove it from the drivers' probe -function. - -Signed-off-by: Noralf Trønnes <noralf@tronnes.org> - -dmaengine: bcm2708: overwrite dreq only if it is not set - -dreq is set when the DMA channel is fetched from Device Tree. -slave_id is set using dmaengine_slave_config(). -Only overwrite dreq with slave_id if it is not set. - -dreq/slave_id in the cyclic DMA case is not touched, because I don't -have hardware to test with. - -Signed-off-by: Noralf Trønnes <noralf@tronnes.org> - -dmaengine: bcm2708: do device registration in the board file - -Don't register the device in the driver. Do it in the board file. - -Signed-off-by: Noralf Trønnes <noralf@tronnes.org> - -dmaengine: bcm2708: don't restrict DT support to ARCH_BCM2835 - -Both ARCH_BCM2835 and ARCH_BCM270x are built with OF now. -Add Device Tree support to the non ARCH_BCM2835 case. -Use the same driver name regardless of architecture. - -Signed-off-by: Noralf Trønnes <noralf@tronnes.org> - -BCM270x_DT: add bcm2835-dma entry - -Add Device Tree entry for bcm2835-dma. -The entry doesn't contain any resources since they are handled -by the arch/arm/mach-bcm270x/dma.c driver. -In non-DT mode, don't add the device in the board file. - -Signed-off-by: Noralf Trønnes <noralf@tronnes.org> - -bcm2708-dmaengine: Add debug options - -BCM270x: Add memory and irq resources to dmaengine device and DT - -Prepare for merging of the legacy DMA API arch driver dma.c -with bcm2708-dmaengine by adding memory and irq resources both -to platform file device and Device Tree node. -Don't use BCM_DMAMAN_DRIVER_NAME so we don't have to include mach/dma.h - -Signed-off-by: Noralf Trønnes <noralf@tronnes.org> - -dmaengine: bcm2708: Merge with arch dma.c driver and disable dma.c - -Merge the legacy DMA API driver with bcm2708-dmaengine. -This is done so we can use bcm2708_fb on ARCH_BCM2835 (mailbox -driver is also needed). - -Changes to the dma.c code: -- Use BIT() macro. -- Cutdown some comments to one line. -- Add mutex to vc_dmaman and use this, since the dev lock is locked - during probing of the engine part. -- Add global g_dmaman variable since drvdata is used by the engine part. -- Restructure for readability: - vc_dmaman_chan_alloc() - vc_dmaman_chan_free() - bcm_dma_chan_free() -- Restructure bcm_dma_chan_alloc() to simplify error handling. -- Use device irq resources instead of hardcoded bcm_dma_irqs table. -- Remove dev_dmaman_register() and code it directly. -- Remove dev_dmaman_deregister() and code it directly. -- Simplify bcm_dmaman_probe() using devm_* functions. -- Get dmachans from DT if available. -- Keep 'dma.dmachans' module argument name for backwards compatibility. - -Make it available on ARCH_BCM2835 as well. - -Signed-off-by: Noralf Trønnes <noralf@tronnes.org> - -dmaengine: bcm2708: set residue_granularity field - -bcm2708-dmaengine supports residue reporting at burst level -but didn't report this via the residue_granularity field. - -Without this field set properly we get playback issues with I2S cards. - -dmaengine: bcm2708-dmaengine: Fix memory leak when stopping a running transfer - -bcm2708-dmaengine: Use more DMA channels (but not 12) - -1) Only the bcm2708_fb drivers uses the legacy DMA API, and -it requires a BULK-capable channel, so all other types -(FAST, NORMAL and LITE) can be made available to the regular -DMA API. - -2) DMA channels 11-14 share an interrupt. The driver can't -handle this, so don't use channels 12-14 (12 was used, probably -because it appears to have an interrupt, but in reality that -interrupt is for activity on ANY channel). This may explain -a lockup encountered when running out of DMA channels. - -The combined effect of this patch is to leave 7 DMA channels -available + channel 0 for bcm2708_fb via the legacy API. - -See: https://github.com/raspberrypi/linux/issues/1110 - https://github.com/raspberrypi/linux/issues/1108 - -dmaengine: bcm2708: Make legacy API available for bcm2835-dma - -bcm2708_fb uses the legacy DMA API, so in order to start using -bcm2835-dma, bcm2835-dma has to support the legacy API. Make this -possible by exporting bcm_dmaman_probe() and bcm_dmaman_remove(). - -Signed-off-by: Noralf Trønnes <noralf@tronnes.org> - -dmaengine: bcm2708: Change DT compatible string - -Both bcm2835-dma and bcm2708-dmaengine have the same compatible string. -So change compatible to "brcm,bcm2708-dma". - -Signed-off-by: Noralf Trønnes <noralf@tronnes.org> - -dmaengine: bcm2708: Remove driver but keep legacy API - -Dropping non-DT support means we don't need this driver, -but we still need the legacy DMA API. - -Signed-off-by: Noralf Trønnes <noralf@tronnes.org> - -bcm2708-dmaengine - Fix arm64 portability/build issues - -dma-bcm2708: Fix module compilation of CONFIG_DMA_BCM2708 - -bcm2708-dmaengine.c defines functions like bcm_dma_start which are -defined as well in dma-bcm2708.h as inline versions when -CONFIG_DMA_BCM2708 is not defined. This works fine when -CONFIG_DMA_BCM2708 is built in, but when it is selected as module build -fails with redefinition errors because in the build system when -CONFIG_DMA_BCM2708 is selected as module, the macro becomes -CONFIG_DMA_BCM2708_MODULE. - -This patch makes the header use CONFIG_DMA_BCM2708_MODULE too when -available. - -Fixes https://github.com/raspberrypi/linux/issues/2056 - -Signed-off-by: Andrei Gherzan <andrei@gherzan.com> ---- - drivers/dma/Kconfig | 6 +- - drivers/dma/Makefile | 1 + - drivers/dma/bcm2708-dmaengine.c | 281 ++++++++++++++++++++++ - include/linux/platform_data/dma-bcm2708.h | 143 +++++++++++ - 4 files changed, 430 insertions(+), 1 deletion(-) - create mode 100644 drivers/dma/bcm2708-dmaengine.c - create mode 100644 include/linux/platform_data/dma-bcm2708.h - ---- a/drivers/dma/Kconfig -+++ b/drivers/dma/Kconfig -@@ -134,7 +134,7 @@ config COH901318 - - config DMA_BCM2835 - tristate "BCM2835 DMA engine support" -- depends on ARCH_BCM2835 || ARCH_BCM2708 || ARCH_BCM2709 -+ depends on ARCH_BCM2835 - select DMA_ENGINE - select DMA_VIRTUAL_CHANNELS - -@@ -609,6 +609,10 @@ config UNIPHIER_MDMAC - UniPhier platform. This DMA controller is used as the external - DMA engine of the SD/eMMC controllers of the LD4, Pro4, sLD8 SoCs. - -+config DMA_BCM2708 -+ tristate "BCM2708 DMA legacy API support" -+ depends on DMA_BCM2835 -+ - config XGENE_DMA - tristate "APM X-Gene DMA support" - depends on ARCH_XGENE || COMPILE_TEST ---- a/drivers/dma/Makefile -+++ b/drivers/dma/Makefile -@@ -21,6 +21,7 @@ obj-$(CONFIG_AT_XDMAC) += at_xdmac.o - obj-$(CONFIG_AXI_DMAC) += dma-axi-dmac.o - obj-$(CONFIG_BCM_SBA_RAID) += bcm-sba-raid.o - obj-$(CONFIG_COH901318) += coh901318.o coh901318_lli.o -+obj-$(CONFIG_DMA_BCM2708) += bcm2708-dmaengine.o - obj-$(CONFIG_DMA_BCM2835) += bcm2835-dma.o - obj-$(CONFIG_DMA_JZ4780) += dma-jz4780.o - obj-$(CONFIG_DMA_SA11X0) += sa11x0-dma.o ---- /dev/null -+++ b/drivers/dma/bcm2708-dmaengine.c -@@ -0,0 +1,281 @@ -+/* -+ * BCM2708 legacy DMA API -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation; either version 2 of the License, or -+ * (at your option) any later version. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ */ -+ -+#include <linux/init.h> -+#include <linux/interrupt.h> -+#include <linux/list.h> -+#include <linux/module.h> -+#include <linux/platform_data/dma-bcm2708.h> -+#include <linux/platform_device.h> -+#include <linux/slab.h> -+#include <linux/io.h> -+#include <linux/spinlock.h> -+ -+#include "virt-dma.h" -+ -+#define CACHE_LINE_MASK 31 -+#define DEFAULT_DMACHAN_BITMAP 0x10 /* channel 4 only */ -+ -+/* valid only for channels 0 - 14, 15 has its own base address */ -+#define BCM2708_DMA_CHAN(n) ((n) << 8) /* base address */ -+#define BCM2708_DMA_CHANIO(dma_base, n) \ -+ ((void __iomem *)((char *)(dma_base) + BCM2708_DMA_CHAN(n))) -+ -+struct vc_dmaman { -+ void __iomem *dma_base; -+ u32 chan_available; /* bitmap of available channels */ -+ u32 has_feature[BCM_DMA_FEATURE_COUNT]; /* bitmap of feature presence */ -+ struct mutex lock; -+}; -+ -+static struct device *dmaman_dev; /* we assume there's only one! */ -+static struct vc_dmaman *g_dmaman; /* DMA manager */ -+ -+/* DMA Auxiliary Functions */ -+ -+/* A DMA buffer on an arbitrary boundary may separate a cache line into a -+ section inside the DMA buffer and another section outside it. -+ Even if we flush DMA buffers from the cache there is always the chance that -+ during a DMA someone will access the part of a cache line that is outside -+ the DMA buffer - which will then bring in unwelcome data. -+ Without being able to dictate our own buffer pools we must insist that -+ DMA buffers consist of a whole number of cache lines. -+*/ -+extern int bcm_sg_suitable_for_dma(struct scatterlist *sg_ptr, int sg_len) -+{ -+ int i; -+ -+ for (i = 0; i < sg_len; i++) { -+ if (sg_ptr[i].offset & CACHE_LINE_MASK || -+ sg_ptr[i].length & CACHE_LINE_MASK) -+ return 0; -+ } -+ -+ return 1; -+} -+EXPORT_SYMBOL_GPL(bcm_sg_suitable_for_dma); -+ -+extern void bcm_dma_start(void __iomem *dma_chan_base, -+ dma_addr_t control_block) -+{ -+ dsb(sy); /* ARM data synchronization (push) operation */ -+ -+ writel(control_block, dma_chan_base + BCM2708_DMA_ADDR); -+ writel(BCM2708_DMA_ACTIVE, dma_chan_base + BCM2708_DMA_CS); -+} -+EXPORT_SYMBOL_GPL(bcm_dma_start); -+ -+extern void bcm_dma_wait_idle(void __iomem *dma_chan_base) -+{ -+ dsb(sy); -+ -+ /* ugly busy wait only option for now */ -+ while (readl(dma_chan_base + BCM2708_DMA_CS) & BCM2708_DMA_ACTIVE) -+ cpu_relax(); -+} -+EXPORT_SYMBOL_GPL(bcm_dma_wait_idle); -+ -+extern bool bcm_dma_is_busy(void __iomem *dma_chan_base) -+{ -+ dsb(sy); -+ -+ return readl(dma_chan_base + BCM2708_DMA_CS) & BCM2708_DMA_ACTIVE; -+} -+EXPORT_SYMBOL_GPL(bcm_dma_is_busy); -+ -+/* Complete an ongoing DMA (assuming its results are to be ignored) -+ Does nothing if there is no DMA in progress. -+ This routine waits for the current AXI transfer to complete before -+ terminating the current DMA. If the current transfer is hung on a DREQ used -+ by an uncooperative peripheral the AXI transfer may never complete. In this -+ case the routine times out and return a non-zero error code. -+ Use of this routine doesn't guarantee that the ongoing or aborted DMA -+ does not produce an interrupt. -+*/ -+extern int bcm_dma_abort(void __iomem *dma_chan_base) -+{ -+ unsigned long int cs; -+ int rc = 0; -+ -+ cs = readl(dma_chan_base + BCM2708_DMA_CS); -+ -+ if (BCM2708_DMA_ACTIVE & cs) { -+ long int timeout = 10000; -+ -+ /* write 0 to the active bit - pause the DMA */ -+ writel(0, dma_chan_base + BCM2708_DMA_CS); -+ -+ /* wait for any current AXI transfer to complete */ -+ while (0 != (cs & BCM2708_DMA_ISPAUSED) && --timeout >= 0) -+ cs = readl(dma_chan_base + BCM2708_DMA_CS); -+ -+ if (0 != (cs & BCM2708_DMA_ISPAUSED)) { -+ /* we'll un-pause when we set of our next DMA */ -+ rc = -ETIMEDOUT; -+ -+ } else if (BCM2708_DMA_ACTIVE & cs) { -+ /* terminate the control block chain */ -+ writel(0, dma_chan_base + BCM2708_DMA_NEXTCB); -+ -+ /* abort the whole DMA */ -+ writel(BCM2708_DMA_ABORT | BCM2708_DMA_ACTIVE, -+ dma_chan_base + BCM2708_DMA_CS); -+ } -+ } -+ -+ return rc; -+} -+EXPORT_SYMBOL_GPL(bcm_dma_abort); -+ -+ /* DMA Manager Device Methods */ -+ -+static void vc_dmaman_init(struct vc_dmaman *dmaman, void __iomem *dma_base, -+ u32 chans_available) -+{ -+ dmaman->dma_base = dma_base; -+ dmaman->chan_available = chans_available; -+ dmaman->has_feature[BCM_DMA_FEATURE_FAST_ORD] = 0x0c; /* 2 & 3 */ -+ dmaman->has_feature[BCM_DMA_FEATURE_BULK_ORD] = 0x01; /* 0 */ -+ dmaman->has_feature[BCM_DMA_FEATURE_NORMAL_ORD] = 0xfe; /* 1 to 7 */ -+ dmaman->has_feature[BCM_DMA_FEATURE_LITE_ORD] = 0x7f00; /* 8 to 14 */ -+} -+ -+static int vc_dmaman_chan_alloc(struct vc_dmaman *dmaman, -+ unsigned required_feature_set) -+{ -+ u32 chans; -+ int chan = 0; -+ int feature; -+ -+ chans = dmaman->chan_available; -+ for (feature = 0; feature < BCM_DMA_FEATURE_COUNT; feature++) -+ /* select the subset of available channels with the desired -+ features */ -+ if (required_feature_set & (1 << feature)) -+ chans &= dmaman->has_feature[feature]; -+ -+ if (!chans) -+ return -ENOENT; -+ -+ /* return the ordinal of the first channel in the bitmap */ -+ while (chans != 0 && (chans & 1) == 0) { -+ chans >>= 1; -+ chan++; -+ } -+ /* claim the channel */ -+ dmaman->chan_available &= ~(1 << chan); -+ -+ return chan; -+} -+ -+static int vc_dmaman_chan_free(struct vc_dmaman *dmaman, int chan) -+{ -+ if (chan < 0) -+ return -EINVAL; -+ -+ if ((1 << chan) & dmaman->chan_available) -+ return -EIDRM; -+ -+ dmaman->chan_available |= (1 << chan); -+ -+ return 0; -+} -+ -+/* DMA Manager Monitor */ -+ -+extern int bcm_dma_chan_alloc(unsigned required_feature_set, -+ void __iomem **out_dma_base, int *out_dma_irq) -+{ -+ struct vc_dmaman *dmaman = g_dmaman; -+ struct platform_device *pdev = to_platform_device(dmaman_dev); -+ struct resource *r; -+ int chan; -+ -+ if (!dmaman_dev) -+ return -ENODEV; -+ -+ mutex_lock(&dmaman->lock); -+ chan = vc_dmaman_chan_alloc(dmaman, required_feature_set); -+ if (chan < 0) -+ goto out; -+ -+ r = platform_get_resource(pdev, IORESOURCE_IRQ, (unsigned int)chan); -+ if (!r) { -+ dev_err(dmaman_dev, "failed to get irq for DMA channel %d\n", -+ chan); -+ vc_dmaman_chan_free(dmaman, chan); -+ chan = -ENOENT; -+ goto out; -+ } -+ -+ *out_dma_base = BCM2708_DMA_CHANIO(dmaman->dma_base, chan); -+ *out_dma_irq = r->start; -+ dev_dbg(dmaman_dev, -+ "Legacy API allocated channel=%d, base=%p, irq=%i\n", -+ chan, *out_dma_base, *out_dma_irq); -+ -+out: -+ mutex_unlock(&dmaman->lock); -+ -+ return chan; -+} -+EXPORT_SYMBOL_GPL(bcm_dma_chan_alloc); -+ -+extern int bcm_dma_chan_free(int channel) -+{ -+ struct vc_dmaman *dmaman = g_dmaman; -+ int rc; -+ -+ if (!dmaman_dev) -+ return -ENODEV; -+ -+ mutex_lock(&dmaman->lock); -+ rc = vc_dmaman_chan_free(dmaman, channel); -+ mutex_unlock(&dmaman->lock); -+ -+ return rc; -+} -+EXPORT_SYMBOL_GPL(bcm_dma_chan_free); -+ -+int bcm_dmaman_probe(struct platform_device *pdev, void __iomem *base, -+ u32 chans_available) -+{ -+ struct device *dev = &pdev->dev; -+ struct vc_dmaman *dmaman; -+ -+ dmaman = devm_kzalloc(dev, sizeof(*dmaman), GFP_KERNEL); -+ if (!dmaman) -+ return -ENOMEM; -+ -+ mutex_init(&dmaman->lock); -+ vc_dmaman_init(dmaman, base, chans_available); -+ g_dmaman = dmaman; -+ dmaman_dev = dev; -+ -+ dev_info(dev, "DMA legacy API manager, dmachans=0x%x\n", -+ chans_available); -+ -+ return 0; -+} -+EXPORT_SYMBOL(bcm_dmaman_probe); -+ -+int bcm_dmaman_remove(struct platform_device *pdev) -+{ -+ dmaman_dev = NULL; -+ -+ return 0; -+} -+EXPORT_SYMBOL(bcm_dmaman_remove); -+ -+MODULE_LICENSE("GPL"); ---- /dev/null -+++ b/include/linux/platform_data/dma-bcm2708.h -@@ -0,0 +1,143 @@ -+/* -+ * Copyright (C) 2010 Broadcom -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 as -+ * published by the Free Software Foundation. -+ */ -+ -+#ifndef _PLAT_BCM2708_DMA_H -+#define _PLAT_BCM2708_DMA_H -+ -+/* DMA CS Control and Status bits */ -+#define BCM2708_DMA_ACTIVE BIT(0) -+#define BCM2708_DMA_INT BIT(2) -+#define BCM2708_DMA_ISPAUSED BIT(4) /* Pause requested or not active */ -+#define BCM2708_DMA_ISHELD BIT(5) /* Is held by DREQ flow control */ -+#define BCM2708_DMA_ERR BIT(8) -+#define BCM2708_DMA_ABORT BIT(30) /* stop current CB, go to next, WO */ -+#define BCM2708_DMA_RESET BIT(31) /* WO, self clearing */ -+ -+/* DMA control block "info" field bits */ -+#define BCM2708_DMA_INT_EN BIT(0) -+#define BCM2708_DMA_TDMODE BIT(1) -+#define BCM2708_DMA_WAIT_RESP BIT(3) -+#define BCM2708_DMA_D_INC BIT(4) -+#define BCM2708_DMA_D_WIDTH BIT(5) -+#define BCM2708_DMA_D_DREQ BIT(6) -+#define BCM2708_DMA_S_INC BIT(8) -+#define BCM2708_DMA_S_WIDTH BIT(9) -+#define BCM2708_DMA_S_DREQ BIT(10) -+ -+#define BCM2708_DMA_BURST(x) (((x) & 0xf) << 12) -+#define BCM2708_DMA_PER_MAP(x) ((x) << 16) -+#define BCM2708_DMA_WAITS(x) (((x) & 0x1f) << 21) -+ -+#define BCM2708_DMA_DREQ_EMMC 11 -+#define BCM2708_DMA_DREQ_SDHOST 13 -+ -+#define BCM2708_DMA_CS 0x00 /* Control and Status */ -+#define BCM2708_DMA_ADDR 0x04 -+/* the current control block appears in the following registers - read only */ -+#define BCM2708_DMA_INFO 0x08 -+#define BCM2708_DMA_SOURCE_AD 0x0c -+#define BCM2708_DMA_DEST_AD 0x10 -+#define BCM2708_DMA_NEXTCB 0x1C -+#define BCM2708_DMA_DEBUG 0x20 -+ -+#define BCM2708_DMA4_CS (BCM2708_DMA_CHAN(4) + BCM2708_DMA_CS) -+#define BCM2708_DMA4_ADDR (BCM2708_DMA_CHAN(4) + BCM2708_DMA_ADDR) -+ -+#define BCM2708_DMA_TDMODE_LEN(w, h) ((h) << 16 | (w)) -+ -+/* When listing features we can ask for when allocating DMA channels give -+ those with higher priority smaller ordinal numbers */ -+#define BCM_DMA_FEATURE_FAST_ORD 0 -+#define BCM_DMA_FEATURE_BULK_ORD 1 -+#define BCM_DMA_FEATURE_NORMAL_ORD 2 -+#define BCM_DMA_FEATURE_LITE_ORD 3 -+#define BCM_DMA_FEATURE_FAST BIT(BCM_DMA_FEATURE_FAST_ORD) -+#define BCM_DMA_FEATURE_BULK BIT(BCM_DMA_FEATURE_BULK_ORD) -+#define BCM_DMA_FEATURE_NORMAL BIT(BCM_DMA_FEATURE_NORMAL_ORD) -+#define BCM_DMA_FEATURE_LITE BIT(BCM_DMA_FEATURE_LITE_ORD) -+#define BCM_DMA_FEATURE_COUNT 4 -+ -+struct bcm2708_dma_cb { -+ u32 info; -+ u32 src; -+ u32 dst; -+ u32 length; -+ u32 stride; -+ u32 next; -+ u32 pad[2]; -+}; -+ -+struct scatterlist; -+struct platform_device; -+ -+#if defined(CONFIG_DMA_BCM2708) || defined(CONFIG_DMA_BCM2708_MODULE) -+ -+int bcm_sg_suitable_for_dma(struct scatterlist *sg_ptr, int sg_len); -+void bcm_dma_start(void __iomem *dma_chan_base, dma_addr_t control_block); -+void bcm_dma_wait_idle(void __iomem *dma_chan_base); -+bool bcm_dma_is_busy(void __iomem *dma_chan_base); -+int bcm_dma_abort(void __iomem *dma_chan_base); -+ -+/* return channel no or -ve error */ -+int bcm_dma_chan_alloc(unsigned preferred_feature_set, -+ void __iomem **out_dma_base, int *out_dma_irq); -+int bcm_dma_chan_free(int channel); -+ -+int bcm_dmaman_probe(struct platform_device *pdev, void __iomem *base, -+ u32 chans_available); -+int bcm_dmaman_remove(struct platform_device *pdev); -+ -+#else /* CONFIG_DMA_BCM2708 */ -+ -+static inline int bcm_sg_suitable_for_dma(struct scatterlist *sg_ptr, -+ int sg_len) -+{ -+ return 0; -+} -+ -+static inline void bcm_dma_start(void __iomem *dma_chan_base, -+ dma_addr_t control_block) { } -+ -+static inline void bcm_dma_wait_idle(void __iomem *dma_chan_base) { } -+ -+static inline bool bcm_dma_is_busy(void __iomem *dma_chan_base) -+{ -+ return false; -+} -+ -+static inline int bcm_dma_abort(void __iomem *dma_chan_base) -+{ -+ return -EINVAL; -+} -+ -+static inline int bcm_dma_chan_alloc(unsigned preferred_feature_set, -+ void __iomem **out_dma_base, -+ int *out_dma_irq) -+{ -+ return -EINVAL; -+} -+ -+static inline int bcm_dma_chan_free(int channel) -+{ -+ return -EINVAL; -+} -+ -+static inline int bcm_dmaman_probe(struct platform_device *pdev, -+ void __iomem *base, u32 chans_available) -+{ -+ return 0; -+} -+ -+static inline int bcm_dmaman_remove(struct platform_device *pdev) -+{ -+ return 0; -+} -+ -+#endif /* CONFIG_DMA_BCM2708 || CONFIG_DMA_BCM2708_MODULE */ -+ -+#endif /* _PLAT_BCM2708_DMA_H */ |