Merge commit 'linus/master' into HEAD

Conflicts:
	MAINTAINERS

Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>

1 files changed, 0 insertions, 597 deletions

diff --git a/arch/arm/mach-imx/dma.c b/arch/arm/mach-imx/dma.c
deleted file mode 100644
index 1536583eece..00000000000
--- a/arch/arm/mach-imx/dma.c
+++ /dev/null
@@ -1,597 +0,0 @@
-/*
- *  linux/arch/arm/mach-imx/dma.c
- *
- *  imx DMA registration and IRQ dispatching
- *
- *  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.
- *
- *  2004-03-03 Sascha Hauer <sascha@saschahauer.de>
- *             initial version heavily inspired by
- *             linux/arch/arm/mach-pxa/dma.c
- *
- *  2005-04-17 Pavel Pisa <pisa@cmp.felk.cvut.cz>
- *             Changed to support scatter gather DMA
- *             by taking Russell's code from RiscPC
- *
- *  2006-05-31 Pavel Pisa <pisa@cmp.felk.cvut.cz>
- *             Corrected error handling code.
- *
- */
-
-#undef DEBUG
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/interrupt.h>
-#include <linux/errno.h>
-
-#include <asm/scatterlist.h>
-#include <asm/system.h>
-#include <asm/irq.h>
-#include <mach/hardware.h>
-#include <mach/dma.h>
-#include <mach/imx-dma.h>
-
-struct imx_dma_channel imx_dma_channels[IMX_DMA_CHANNELS];
-
-/*
- * imx_dma_sg_next - prepare next chunk for scatter-gather DMA emulation
- * @dma_ch: i.MX DMA channel number
- * @lastcount: number of bytes transferred during last transfer
- *
- * Functions prepares DMA controller for next sg data chunk transfer.
- * The @lastcount argument informs function about number of bytes transferred
- * during last block. Zero value can be used for @lastcount to setup DMA
- * for the first chunk.
- */
-static inline int imx_dma_sg_next(imx_dmach_t dma_ch, unsigned int lastcount)
-{
-	struct imx_dma_channel *imxdma = &imx_dma_channels[dma_ch];
-	unsigned int nextcount;
-	unsigned int nextaddr;
-
-	if (!imxdma->name) {
-		printk(KERN_CRIT "%s: called for  not allocated channel %d\n",
-		       __func__, dma_ch);
-		return 0;
-	}
-
-	imxdma->resbytes -= lastcount;
-
-	if (!imxdma->sg) {
-		pr_debug("imxdma%d: no sg data\n", dma_ch);
-		return 0;
-	}
-
-	imxdma->sgbc += lastcount;
-	if ((imxdma->sgbc >= imxdma->sg->length) || !imxdma->resbytes) {
-		if ((imxdma->sgcount <= 1) || !imxdma->resbytes) {
-			pr_debug("imxdma%d: sg transfer limit reached\n",
-				 dma_ch);
-			imxdma->sgcount=0;
-			imxdma->sg = NULL;
-			return 0;
-		} else {
-			imxdma->sgcount--;
-			imxdma->sg++;
-			imxdma->sgbc = 0;
-		}
-	}
-	nextcount = imxdma->sg->length - imxdma->sgbc;
-	nextaddr = imxdma->sg->dma_address + imxdma->sgbc;
-
-	if(imxdma->resbytes < nextcount)
-		nextcount = imxdma->resbytes;
-
-	if ((imxdma->dma_mode & DMA_MODE_MASK) == DMA_MODE_READ)
-		DAR(dma_ch) = nextaddr;
-	else
-		SAR(dma_ch) = nextaddr;
-
-	CNTR(dma_ch) = nextcount;
-	pr_debug("imxdma%d: next sg chunk dst 0x%08x, src 0x%08x, size 0x%08x\n",
-		 dma_ch, DAR(dma_ch), SAR(dma_ch), CNTR(dma_ch));
-
-	return nextcount;
-}
-
-/*
- * imx_dma_setup_sg_base - scatter-gather DMA emulation
- * @dma_ch: i.MX DMA channel number
- * @sg: pointer to the scatter-gather list/vector
- * @sgcount: scatter-gather list hungs count
- *
- * Functions sets up i.MX DMA state for emulated scatter-gather transfer
- * and sets up channel registers to be ready for the first chunk
- */
-static int
-imx_dma_setup_sg_base(imx_dmach_t dma_ch,
-		      struct scatterlist *sg, unsigned int sgcount)
-{
-	struct imx_dma_channel *imxdma = &imx_dma_channels[dma_ch];
-
-	imxdma->sg = sg;
-	imxdma->sgcount = sgcount;
-	imxdma->sgbc = 0;
-	return imx_dma_sg_next(dma_ch, 0);
-}
-
-/**
- * imx_dma_setup_single - setup i.MX DMA channel for linear memory to/from device transfer
- * @dma_ch: i.MX DMA channel number
- * @dma_address: the DMA/physical memory address of the linear data block
- *		to transfer
- * @dma_length: length of the data block in bytes
- * @dev_addr: physical device port address
- * @dmamode: DMA transfer mode, %DMA_MODE_READ from the device to the memory
- *           or %DMA_MODE_WRITE from memory to the device
- *
- * The function setups DMA channel source and destination addresses for transfer
- * specified by provided parameters. The scatter-gather emulation is disabled,
- * because linear data block
- * form the physical address range is transferred.
- * Return value: if incorrect parameters are provided -%EINVAL.
- *		Zero indicates success.
- */
-int
-imx_dma_setup_single(imx_dmach_t dma_ch, dma_addr_t dma_address,
-		     unsigned int dma_length, unsigned int dev_addr,
-		     unsigned int dmamode)
-{
-	struct imx_dma_channel *imxdma = &imx_dma_channels[dma_ch];
-
-	imxdma->sg = NULL;
-	imxdma->sgcount = 0;
-	imxdma->dma_mode = dmamode;
-	imxdma->resbytes = dma_length;
-
-	if (!dma_address) {
-		printk(KERN_ERR "imxdma%d: imx_dma_setup_single null address\n",
-		       dma_ch);
-		return -EINVAL;
-	}
-
-	if (!dma_length) {
-		printk(KERN_ERR "imxdma%d: imx_dma_setup_single zero length\n",
-		       dma_ch);
-		return -EINVAL;
-	}
-
-	if ((dmamode & DMA_MODE_MASK) == DMA_MODE_READ) {
-		pr_debug("imxdma%d: mx_dma_setup_single2dev dma_addressg=0x%08x dma_length=%d dev_addr=0x%08x for read\n",
-			dma_ch, (unsigned int)dma_address, dma_length,
-			dev_addr);
-		SAR(dma_ch) = dev_addr;
-		DAR(dma_ch) = (unsigned int)dma_address;
-	} else if ((dmamode & DMA_MODE_MASK) == DMA_MODE_WRITE) {
-		pr_debug("imxdma%d: mx_dma_setup_single2dev dma_addressg=0x%08x dma_length=%d dev_addr=0x%08x for write\n",
-			dma_ch, (unsigned int)dma_address, dma_length,
-			dev_addr);
-		SAR(dma_ch) = (unsigned int)dma_address;
-		DAR(dma_ch) = dev_addr;
-	} else {
-		printk(KERN_ERR "imxdma%d: imx_dma_setup_single bad dmamode\n",
-		       dma_ch);
-		return -EINVAL;
-	}
-
-	CNTR(dma_ch) = dma_length;
-
-	return 0;
-}
-
-/**
- * imx_dma_setup_sg - setup i.MX DMA channel SG list to/from device transfer
- * @dma_ch: i.MX DMA channel number
- * @sg: pointer to the scatter-gather list/vector
- * @sgcount: scatter-gather list hungs count
- * @dma_length: total length of the transfer request in bytes
- * @dev_addr: physical device port address
- * @dmamode: DMA transfer mode, %DMA_MODE_READ from the device to the memory
- *           or %DMA_MODE_WRITE from memory to the device
- *
- * The function sets up DMA channel state and registers to be ready for transfer
- * specified by provided parameters. The scatter-gather emulation is set up
- * according to the parameters.
- *
- * The full preparation of the transfer requires setup of more register
- * by the caller before imx_dma_enable() can be called.
- *
- * %BLR(dma_ch) holds transfer burst length in bytes, 0 means 64 bytes
- *
- * %RSSR(dma_ch) has to be set to the DMA request line source %DMA_REQ_xxx
- *
- * %CCR(dma_ch) has to specify transfer parameters, the next settings is typical
- * for linear or simple scatter-gather transfers if %DMA_MODE_READ is specified
- *
- * %CCR_DMOD_LINEAR | %CCR_DSIZ_32 | %CCR_SMOD_FIFO | %CCR_SSIZ_x
- *
- * The typical setup for %DMA_MODE_WRITE is specified by next options combination
- *
- * %CCR_SMOD_LINEAR | %CCR_SSIZ_32 | %CCR_DMOD_FIFO | %CCR_DSIZ_x
- *
- * Be careful here and do not mistakenly mix source and target device
- * port sizes constants, they are really different:
- * %CCR_SSIZ_8, %CCR_SSIZ_16, %CCR_SSIZ_32,
- * %CCR_DSIZ_8, %CCR_DSIZ_16, %CCR_DSIZ_32
- *
- * Return value: if incorrect parameters are provided -%EINVAL.
- * Zero indicates success.
- */
-int
-imx_dma_setup_sg(imx_dmach_t dma_ch,
-		 struct scatterlist *sg, unsigned int sgcount, unsigned int dma_length,
-		 unsigned int dev_addr, unsigned int dmamode)
-{
-	int res;
-	struct imx_dma_channel *imxdma = &imx_dma_channels[dma_ch];
-
-	imxdma->sg = NULL;
-	imxdma->sgcount = 0;
-	imxdma->dma_mode = dmamode;
-	imxdma->resbytes = dma_length;
-
-	if (!sg || !sgcount) {
-		printk(KERN_ERR "imxdma%d: imx_dma_setup_sg epty sg list\n",
-		       dma_ch);
-		return -EINVAL;
-	}
-
-	if (!sg->length) {
-		printk(KERN_ERR "imxdma%d: imx_dma_setup_sg zero length\n",
-		       dma_ch);
-		return -EINVAL;
-	}
-
-	if ((dmamode & DMA_MODE_MASK) == DMA_MODE_READ) {
-		pr_debug("imxdma%d: mx_dma_setup_sg2dev sg=%p sgcount=%d total length=%d dev_addr=0x%08x for read\n",
-			dma_ch, sg, sgcount, dma_length, dev_addr);
-		SAR(dma_ch) = dev_addr;
-	} else if ((dmamode & DMA_MODE_MASK) == DMA_MODE_WRITE) {
-		pr_debug("imxdma%d: mx_dma_setup_sg2dev sg=%p sgcount=%d total length=%d dev_addr=0x%08x for write\n",
-			dma_ch, sg, sgcount, dma_length, dev_addr);
-		DAR(dma_ch) = dev_addr;
-	} else {
-		printk(KERN_ERR "imxdma%d: imx_dma_setup_sg bad dmamode\n",
-		       dma_ch);
-		return -EINVAL;
-	}
-
-	res = imx_dma_setup_sg_base(dma_ch, sg, sgcount);
-	if (res <= 0) {
-		printk(KERN_ERR "imxdma%d: no sg chunk ready\n", dma_ch);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-/**
- * imx_dma_setup_handlers - setup i.MX DMA channel end and error notification handlers
- * @dma_ch: i.MX DMA channel number
- * @irq_handler: the pointer to the function called if the transfer
- *		ends successfully
- * @err_handler: the pointer to the function called if the premature
- *		end caused by error occurs
- * @data: user specified value to be passed to the handlers
- */
-int
-imx_dma_setup_handlers(imx_dmach_t dma_ch,
-		       void (*irq_handler) (int, void *),
-		       void (*err_handler) (int, void *, int),
-		       void *data)
-{
-	struct imx_dma_channel *imxdma = &imx_dma_channels[dma_ch];
-	unsigned long flags;
-
-	if (!imxdma->name) {
-		printk(KERN_CRIT "%s: called for  not allocated channel %d\n",
-		       __func__, dma_ch);
-		return -ENODEV;
-	}
-
-	local_irq_save(flags);
-	DISR = (1 << dma_ch);
-	imxdma->irq_handler = irq_handler;
-	imxdma->err_handler = err_handler;
-	imxdma->data = data;
-	local_irq_restore(flags);
-	return 0;
-}
-
-/**
- * imx_dma_enable - function to start i.MX DMA channel operation
- * @dma_ch: i.MX DMA channel number
- *
- * The channel has to be allocated by driver through imx_dma_request()
- * or imx_dma_request_by_prio() function.
- * The transfer parameters has to be set to the channel registers through
- * call of the imx_dma_setup_single() or imx_dma_setup_sg() function
- * and registers %BLR(dma_ch), %RSSR(dma_ch) and %CCR(dma_ch) has to
- * be set prior this function call by the channel user.
- */
-void imx_dma_enable(imx_dmach_t dma_ch)
-{
-	struct imx_dma_channel *imxdma = &imx_dma_channels[dma_ch];
-	unsigned long flags;
-
-	pr_debug("imxdma%d: imx_dma_enable\n", dma_ch);
-
-	if (!imxdma->name) {
-		printk(KERN_CRIT "%s: called for  not allocated channel %d\n",
-		       __func__, dma_ch);
-		return;
-	}
-
-	local_irq_save(flags);
-	DISR = (1 << dma_ch);
-	DIMR &= ~(1 << dma_ch);
-	CCR(dma_ch) |= CCR_CEN;
-	local_irq_restore(flags);
-}
-
-/**
- * imx_dma_disable - stop, finish i.MX DMA channel operatin
- * @dma_ch: i.MX DMA channel number
- */
-void imx_dma_disable(imx_dmach_t dma_ch)
-{
-	unsigned long flags;
-
-	pr_debug("imxdma%d: imx_dma_disable\n", dma_ch);
-
-	local_irq_save(flags);
-	DIMR |= (1 << dma_ch);
-	CCR(dma_ch) &= ~CCR_CEN;
-	DISR = (1 << dma_ch);
-	local_irq_restore(flags);
-}
-
-/**
- * imx_dma_request - request/allocate specified channel number
- * @dma_ch: i.MX DMA channel number
- * @name: the driver/caller own non-%NULL identification
- */
-int imx_dma_request(imx_dmach_t dma_ch, const char *name)
-{
-	struct imx_dma_channel *imxdma = &imx_dma_channels[dma_ch];
-	unsigned long flags;
-
-	/* basic sanity checks */
-	if (!name)
-		return -EINVAL;
-
-	if (dma_ch >= IMX_DMA_CHANNELS) {
-		printk(KERN_CRIT "%s: called for  non-existed channel %d\n",
-		       __func__, dma_ch);
-		return -EINVAL;
-	}
-
-	local_irq_save(flags);
-	if (imxdma->name) {
-		local_irq_restore(flags);
-		return -ENODEV;
-	}
-
-	imxdma->name = name;
-	imxdma->irq_handler = NULL;
-	imxdma->err_handler = NULL;
-	imxdma->data = NULL;
-	imxdma->sg = NULL;
-	local_irq_restore(flags);
-	return 0;
-}
-
-/**
- * imx_dma_free - release previously acquired channel
- * @dma_ch: i.MX DMA channel number
- */
-void imx_dma_free(imx_dmach_t dma_ch)
-{
-	unsigned long flags;
-	struct imx_dma_channel *imxdma = &imx_dma_channels[dma_ch];
-
-	if (!imxdma->name) {
-		printk(KERN_CRIT
-		       "%s: trying to free channel %d which is already freed\n",
-		       __func__, dma_ch);
-		return;
-	}
-
-	local_irq_save(flags);
-	/* Disable interrupts */
-	DIMR |= (1 << dma_ch);
-	CCR(dma_ch) &= ~CCR_CEN;
-	imxdma->name = NULL;
-	local_irq_restore(flags);
-}
-
-/**
- * imx_dma_request_by_prio - find and request some of free channels best suiting requested priority
- * @name: the driver/caller own non-%NULL identification
- * @prio: one of the hardware distinguished priority level:
- *        %DMA_PRIO_HIGH, %DMA_PRIO_MEDIUM, %DMA_PRIO_LOW
- *
- * This function tries to find free channel in the specified priority group
- * if the priority cannot be achieved it tries to look for free channel
- * in the higher and then even lower priority groups.
- *
- * Return value: If there is no free channel to allocate, -%ENODEV is returned.
- *               On successful allocation channel is returned.
- */
-imx_dmach_t imx_dma_request_by_prio(const char *name, imx_dma_prio prio)
-{
-	int i;
-	int best;
-
-	switch (prio) {
-	case (DMA_PRIO_HIGH):
-		best = 8;
-		break;
-	case (DMA_PRIO_MEDIUM):
-		best = 4;
-		break;
-	case (DMA_PRIO_LOW):
-	default:
-		best = 0;
-		break;
-	}
-
-	for (i = best; i < IMX_DMA_CHANNELS; i++) {
-		if (!imx_dma_request(i, name)) {
-			return i;
-		}
-	}
-
-	for (i = best - 1; i >= 0; i--) {
-		if (!imx_dma_request(i, name)) {
-			return i;
-		}
-	}
-
-	printk(KERN_ERR "%s: no free DMA channel found\n", __func__);
-
-	return -ENODEV;
-}
-
-static irqreturn_t dma_err_handler(int irq, void *dev_id)
-{
-	int i, disr = DISR;
-	struct imx_dma_channel *channel;
-	unsigned int err_mask = DBTOSR | DRTOSR | DSESR | DBOSR;
-	int errcode;
-
-	DISR = disr & err_mask;
-	for (i = 0; i < IMX_DMA_CHANNELS; i++) {
-		if(!(err_mask & (1 << i)))
-			continue;
-		channel = &imx_dma_channels[i];
-		errcode = 0;
-
-		if (DBTOSR & (1 << i)) {
-			DBTOSR = (1 << i);
-			errcode |= IMX_DMA_ERR_BURST;
-		}
-		if (DRTOSR & (1 << i)) {
-			DRTOSR = (1 << i);
-			errcode |= IMX_DMA_ERR_REQUEST;
-		}
-		if (DSESR & (1 << i)) {
-			DSESR = (1 << i);
-			errcode |= IMX_DMA_ERR_TRANSFER;
-		}
-		if (DBOSR & (1 << i)) {
-			DBOSR = (1 << i);
-			errcode |= IMX_DMA_ERR_BUFFER;
-		}
-
-		/*
-		 * The cleaning of @sg field would be questionable
-		 * there, because its value can help to compute
-		 * remaining/transferred bytes count in the handler
-		 */
-		/*imx_dma_channels[i].sg = NULL;*/
-
-		if (channel->name && channel->err_handler) {
-			channel->err_handler(i, channel->data, errcode);
-			continue;
-		}
-
-		imx_dma_channels[i].sg = NULL;
-
-		printk(KERN_WARNING
-		       "DMA timeout on channel %d (%s) -%s%s%s%s\n",
-		       i, channel->name,
-		       errcode&IMX_DMA_ERR_BURST?    " burst":"",
-		       errcode&IMX_DMA_ERR_REQUEST?  " request":"",
-		       errcode&IMX_DMA_ERR_TRANSFER? " transfer":"",
-		       errcode&IMX_DMA_ERR_BUFFER?   " buffer":"");
-	}
-	return IRQ_HANDLED;
-}
-
-static irqreturn_t dma_irq_handler(int irq, void *dev_id)
-{
-	int i, disr = DISR;
-
-	pr_debug("imxdma: dma_irq_handler called, disr=0x%08x\n",
-		     disr);
-
-	DISR = disr;
-	for (i = 0; i < IMX_DMA_CHANNELS; i++) {
-		if (disr & (1 << i)) {
-			struct imx_dma_channel *channel = &imx_dma_channels[i];
-			if (channel->name) {
-				if (imx_dma_sg_next(i, CNTR(i))) {
-					CCR(i) &= ~CCR_CEN;
-					mb();
-					CCR(i) |= CCR_CEN;
-				} else {
-					if (channel->irq_handler)
-						channel->irq_handler(i,
-							channel->data);
-				}
-			} else {
-				/*
-				 * IRQ for an unregistered DMA channel:
-				 * let's clear the interrupts and disable it.
-				 */
-				printk(KERN_WARNING
-				       "spurious IRQ for DMA channel %d\n", i);
-			}
-		}
-	}
-	return IRQ_HANDLED;
-}
-
-static int __init imx_dma_init(void)
-{
-	int ret;
-	int i;
-
-	/* reset DMA module */
-	DCR = DCR_DRST;
-
-	ret = request_irq(DMA_INT, dma_irq_handler, 0, "DMA", NULL);
-	if (ret) {
-		printk(KERN_CRIT "Wow!  Can't register IRQ for DMA\n");
-		return ret;
-	}
-
-	ret = request_irq(DMA_ERR, dma_err_handler, 0, "DMA", NULL);
-	if (ret) {
-		printk(KERN_CRIT "Wow!  Can't register ERRIRQ for DMA\n");
-		free_irq(DMA_INT, NULL);
-	}
-
-	/* enable DMA module */
-	DCR = DCR_DEN;
-
-	/* clear all interrupts */
-	DISR = (1 << IMX_DMA_CHANNELS) - 1;
-
-	/* enable interrupts */
-	DIMR = (1 << IMX_DMA_CHANNELS) - 1;
-
-	for (i = 0; i < IMX_DMA_CHANNELS; i++) {
-		imx_dma_channels[i].sg = NULL;
-		imx_dma_channels[i].dma_num = i;
-	}
-
-	return ret;
-}
-
-arch_initcall(imx_dma_init);
-
-EXPORT_SYMBOL(imx_dma_setup_single);
-EXPORT_SYMBOL(imx_dma_setup_sg);
-EXPORT_SYMBOL(imx_dma_setup_handlers);
-EXPORT_SYMBOL(imx_dma_enable);
-EXPORT_SYMBOL(imx_dma_disable);
-EXPORT_SYMBOL(imx_dma_request);
-EXPORT_SYMBOL(imx_dma_free);
-EXPORT_SYMBOL(imx_dma_request_by_prio);
-EXPORT_SYMBOL(imx_dma_channels);