diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0031-dmaengine-Add-support-for-BCM2708.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0031-dmaengine-Add-support-for-BCM2708.patch | 612 |
1 files changed, 612 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0031-dmaengine-Add-support-for-BCM2708.patch b/target/linux/brcm2708/patches-4.4/0031-dmaengine-Add-support-for-BCM2708.patch new file mode 100644 index 0000000..38d70d9 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0031-dmaengine-Add-support-for-BCM2708.patch @@ -0,0 +1,612 @@ +From 51d9f11052d8e51931b1c5f816d737e64e1caa22 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 031/127] 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> +--- + drivers/dma/Kconfig | 4 + + drivers/dma/Makefile | 1 + + drivers/dma/bcm2708-dmaengine.c | 281 ++++++++++++++++++++++++++++++ + include/linux/platform_data/dma-bcm2708.h | 143 +++++++++++++++ + 4 files changed, 429 insertions(+) + 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 +@@ -470,6 +470,10 @@ config TIMB_DMA + help + Enable support for the Timberdale FPGA DMA engine. + ++config DMA_BCM2708 ++ tristate "BCM2708 DMA legacy API support" ++ depends on DMA_BCM2835 ++ + config TI_CPPI41 + tristate "AM33xx CPPI41 DMA support" + depends on ARCH_OMAP +--- a/drivers/dma/Makefile ++++ b/drivers/dma/Makefile +@@ -18,6 +18,7 @@ obj-$(CONFIG_AT_HDMAC) += at_hdmac.o + obj-$(CONFIG_AT_XDMAC) += at_xdmac.o + obj-$(CONFIG_AXI_DMAC) += dma-axi-dmac.o + obj-$(CONFIG_COH901318) += coh901318.o coh901318_lli.o ++obj-$(CONFIG_DMA_BCM2708) += bcm2708-dmaengine.o + obj-$(CONFIG_DMA_BCM2835) += bcm2835-dma.o + obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o + obj-$(CONFIG_DMA_JZ4780) += dma-jz4780.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(); /* 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(); ++ ++ /* 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(); ++ ++ 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 at %p, dmachans=0x%x\n", ++ base, 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 { ++ unsigned long info; ++ unsigned long src; ++ unsigned long dst; ++ unsigned long length; ++ unsigned long stride; ++ unsigned long next; ++ unsigned long pad[2]; ++}; ++ ++struct scatterlist; ++struct platform_device; ++ ++#ifdef CONFIG_DMA_BCM2708 ++ ++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 */ ++ ++#endif /* _PLAT_BCM2708_DMA_H */ |