summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-imx/dma-v1.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-imx/dma-v1.c')
-rw-r--r--arch/arm/mach-imx/dma-v1.c846
1 files changed, 0 insertions, 846 deletions
diff --git a/arch/arm/mach-imx/dma-v1.c b/arch/arm/mach-imx/dma-v1.c
deleted file mode 100644
index 42afc29..0000000
--- a/arch/arm/mach-imx/dma-v1.c
+++ /dev/null
@@ -1,846 +0,0 @@
-/*
- * linux/arch/arm/plat-mxc/dma-v1.c
- *
- * i.MX DMA registration and IRQ dispatching
- *
- * Copyright 2006 Pavel Pisa <pisa@cmp.felk.cvut.cz>
- * Copyright 2008 Juergen Beisert, <kernel@pengutronix.de>
- * Copyright 2008 Sascha Hauer, <s.hauer@pengutronix.de>
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
- * MA 02110-1301, USA.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/interrupt.h>
-#include <linux/err.h>
-#include <linux/errno.h>
-#include <linux/clk.h>
-#include <linux/scatterlist.h>
-#include <linux/io.h>
-
-#include <asm/system.h>
-#include <asm/irq.h>
-#include <mach/hardware.h>
-#include <mach/dma-v1.h>
-
-#define DMA_DCR 0x00 /* Control Register */
-#define DMA_DISR 0x04 /* Interrupt status Register */
-#define DMA_DIMR 0x08 /* Interrupt mask Register */
-#define DMA_DBTOSR 0x0c /* Burst timeout status Register */
-#define DMA_DRTOSR 0x10 /* Request timeout Register */
-#define DMA_DSESR 0x14 /* Transfer Error Status Register */
-#define DMA_DBOSR 0x18 /* Buffer overflow status Register */
-#define DMA_DBTOCR 0x1c /* Burst timeout control Register */
-#define DMA_WSRA 0x40 /* W-Size Register A */
-#define DMA_XSRA 0x44 /* X-Size Register A */
-#define DMA_YSRA 0x48 /* Y-Size Register A */
-#define DMA_WSRB 0x4c /* W-Size Register B */
-#define DMA_XSRB 0x50 /* X-Size Register B */
-#define DMA_YSRB 0x54 /* Y-Size Register B */
-#define DMA_SAR(x) (0x80 + ((x) << 6)) /* Source Address Registers */
-#define DMA_DAR(x) (0x84 + ((x) << 6)) /* Destination Address Registers */
-#define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */
-#define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */
-#define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */
-#define DMA_BLR(x) (0x94 + ((x) << 6)) /* Burst length Registers */
-#define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */
-#define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */
-#define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */
-
-#define DCR_DRST (1<<1)
-#define DCR_DEN (1<<0)
-#define DBTOCR_EN (1<<15)
-#define DBTOCR_CNT(x) ((x) & 0x7fff)
-#define CNTR_CNT(x) ((x) & 0xffffff)
-#define CCR_ACRPT (1<<14)
-#define CCR_DMOD_LINEAR (0x0 << 12)
-#define CCR_DMOD_2D (0x1 << 12)
-#define CCR_DMOD_FIFO (0x2 << 12)
-#define CCR_DMOD_EOBFIFO (0x3 << 12)
-#define CCR_SMOD_LINEAR (0x0 << 10)
-#define CCR_SMOD_2D (0x1 << 10)
-#define CCR_SMOD_FIFO (0x2 << 10)
-#define CCR_SMOD_EOBFIFO (0x3 << 10)
-#define CCR_MDIR_DEC (1<<9)
-#define CCR_MSEL_B (1<<8)
-#define CCR_DSIZ_32 (0x0 << 6)
-#define CCR_DSIZ_8 (0x1 << 6)
-#define CCR_DSIZ_16 (0x2 << 6)
-#define CCR_SSIZ_32 (0x0 << 4)
-#define CCR_SSIZ_8 (0x1 << 4)
-#define CCR_SSIZ_16 (0x2 << 4)
-#define CCR_REN (1<<3)
-#define CCR_RPT (1<<2)
-#define CCR_FRC (1<<1)
-#define CCR_CEN (1<<0)
-#define RTOR_EN (1<<15)
-#define RTOR_CLK (1<<14)
-#define RTOR_PSC (1<<13)
-
-/*
- * struct imx_dma_channel - i.MX specific DMA extension
- * @name: name specified by DMA client
- * @irq_handler: client callback for end of transfer
- * @err_handler: client callback for error condition
- * @data: clients context data for callbacks
- * @dma_mode: direction of the transfer %DMA_MODE_READ or %DMA_MODE_WRITE
- * @sg: pointer to the actual read/written chunk for scatter-gather emulation
- * @resbytes: total residual number of bytes to transfer
- * (it can be lower or same as sum of SG mapped chunk sizes)
- * @sgcount: number of chunks to be read/written
- *
- * Structure is used for IMX DMA processing. It would be probably good
- * @struct dma_struct in the future for external interfacing and use
- * @struct imx_dma_channel only as extension to it.
- */
-
-struct imx_dma_channel {
- const char *name;
- void (*irq_handler) (int, void *);
- void (*err_handler) (int, void *, int errcode);
- void (*prog_handler) (int, void *, struct scatterlist *);
- void *data;
- unsigned int dma_mode;
- struct scatterlist *sg;
- unsigned int resbytes;
- int dma_num;
-
- int in_use;
-
- u32 ccr_from_device;
- u32 ccr_to_device;
-
- struct timer_list watchdog;
-
- int hw_chaining;
-};
-
-static void __iomem *imx_dmav1_baseaddr;
-
-static void imx_dmav1_writel(unsigned val, unsigned offset)
-{
- __raw_writel(val, imx_dmav1_baseaddr + offset);
-}
-
-static unsigned imx_dmav1_readl(unsigned offset)
-{
- return __raw_readl(imx_dmav1_baseaddr + offset);
-}
-
-static struct imx_dma_channel imx_dma_channels[IMX_DMA_CHANNELS];
-
-static struct clk *dma_clk;
-
-static int imx_dma_hw_chain(struct imx_dma_channel *imxdma)
-{
- if (cpu_is_mx27())
- return imxdma->hw_chaining;
- else
- return 0;
-}
-
-/*
- * imx_dma_sg_next - prepare next chunk for scatter-gather DMA emulation
- */
-static inline int imx_dma_sg_next(int channel, struct scatterlist *sg)
-{
- struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
- unsigned long now;
-
- if (!imxdma->name) {
- printk(KERN_CRIT "%s: called for not allocated channel %d\n",
- __func__, channel);
- return 0;
- }
-
- now = min(imxdma->resbytes, sg->length);
- if (imxdma->resbytes != IMX_DMA_LENGTH_LOOP)
- imxdma->resbytes -= now;
-
- if ((imxdma->dma_mode & DMA_MODE_MASK) == DMA_MODE_READ)
- imx_dmav1_writel(sg->dma_address, DMA_DAR(channel));
- else
- imx_dmav1_writel(sg->dma_address, DMA_SAR(channel));
-
- imx_dmav1_writel(now, DMA_CNTR(channel));
-
- pr_debug("imxdma%d: next sg chunk dst 0x%08x, src 0x%08x, "
- "size 0x%08x\n", channel,
- imx_dmav1_readl(DMA_DAR(channel)),
- imx_dmav1_readl(DMA_SAR(channel)),
- imx_dmav1_readl(DMA_CNTR(channel)));
-
- return now;
-}
-
-/**
- * imx_dma_setup_single - setup i.MX DMA channel for linear memory to/from
- * device transfer
- *
- * @channel: 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
- *
- * Return value: if incorrect parameters are provided -%EINVAL.
- * Zero indicates success.
- */
-int
-imx_dma_setup_single(int channel, dma_addr_t dma_address,
- unsigned int dma_length, unsigned int dev_addr,
- unsigned int dmamode)
-{
- struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
-
- imxdma->sg = NULL;
- imxdma->dma_mode = dmamode;
-
- if (!dma_address) {
- printk(KERN_ERR "imxdma%d: imx_dma_setup_single null address\n",
- channel);
- return -EINVAL;
- }
-
- if (!dma_length) {
- printk(KERN_ERR "imxdma%d: imx_dma_setup_single zero length\n",
- channel);
- return -EINVAL;
- }
-
- if ((dmamode & DMA_MODE_MASK) == DMA_MODE_READ) {
- pr_debug("imxdma%d: %s dma_addressg=0x%08x dma_length=%d "
- "dev_addr=0x%08x for read\n",
- channel, __func__, (unsigned int)dma_address,
- dma_length, dev_addr);
-
- imx_dmav1_writel(dev_addr, DMA_SAR(channel));
- imx_dmav1_writel(dma_address, DMA_DAR(channel));
- imx_dmav1_writel(imxdma->ccr_from_device, DMA_CCR(channel));
- } else if ((dmamode & DMA_MODE_MASK) == DMA_MODE_WRITE) {
- pr_debug("imxdma%d: %s dma_addressg=0x%08x dma_length=%d "
- "dev_addr=0x%08x for write\n",
- channel, __func__, (unsigned int)dma_address,
- dma_length, dev_addr);
-
- imx_dmav1_writel(dma_address, DMA_SAR(channel));
- imx_dmav1_writel(dev_addr, DMA_DAR(channel));
- imx_dmav1_writel(imxdma->ccr_to_device,
- DMA_CCR(channel));
- } else {
- printk(KERN_ERR "imxdma%d: imx_dma_setup_single bad dmamode\n",
- channel);
- return -EINVAL;
- }
-
- imx_dmav1_writel(dma_length, DMA_CNTR(channel));
-
- return 0;
-}
-EXPORT_SYMBOL(imx_dma_setup_single);
-
-/**
- * imx_dma_setup_sg - setup i.MX DMA channel SG list to/from device transfer
- * @channel: 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(channel) holds transfer burst length in bytes, 0 means 64 bytes
- *
- * %RSSR(channel) has to be set to the DMA request line source %DMA_REQ_xxx
- *
- * %CCR(channel) 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(int channel,
- struct scatterlist *sg, unsigned int sgcount,
- unsigned int dma_length, unsigned int dev_addr,
- unsigned int dmamode)
-{
- struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
-
- if (imxdma->in_use)
- return -EBUSY;
-
- imxdma->sg = sg;
- imxdma->dma_mode = dmamode;
- imxdma->resbytes = dma_length;
-
- if (!sg || !sgcount) {
- printk(KERN_ERR "imxdma%d: imx_dma_setup_sg empty sg list\n",
- channel);
- return -EINVAL;
- }
-
- if (!sg->length) {
- printk(KERN_ERR "imxdma%d: imx_dma_setup_sg zero length\n",
- channel);
- return -EINVAL;
- }
-
- if ((dmamode & DMA_MODE_MASK) == DMA_MODE_READ) {
- pr_debug("imxdma%d: %s sg=%p sgcount=%d total length=%d "
- "dev_addr=0x%08x for read\n",
- channel, __func__, sg, sgcount, dma_length, dev_addr);
-
- imx_dmav1_writel(dev_addr, DMA_SAR(channel));
- imx_dmav1_writel(imxdma->ccr_from_device, DMA_CCR(channel));
- } else if ((dmamode & DMA_MODE_MASK) == DMA_MODE_WRITE) {
- pr_debug("imxdma%d: %s sg=%p sgcount=%d total length=%d "
- "dev_addr=0x%08x for write\n",
- channel, __func__, sg, sgcount, dma_length, dev_addr);
-
- imx_dmav1_writel(dev_addr, DMA_DAR(channel));
- imx_dmav1_writel(imxdma->ccr_to_device, DMA_CCR(channel));
- } else {
- printk(KERN_ERR "imxdma%d: imx_dma_setup_sg bad dmamode\n",
- channel);
- return -EINVAL;
- }
-
- imx_dma_sg_next(channel, sg);
-
- return 0;
-}
-EXPORT_SYMBOL(imx_dma_setup_sg);
-
-int
-imx_dma_config_channel(int channel, unsigned int config_port,
- unsigned int config_mem, unsigned int dmareq, int hw_chaining)
-{
- struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
- u32 dreq = 0;
-
- imxdma->hw_chaining = 0;
-
- if (hw_chaining) {
- imxdma->hw_chaining = 1;
- if (!imx_dma_hw_chain(imxdma))
- return -EINVAL;
- }
-
- if (dmareq)
- dreq = CCR_REN;
-
- imxdma->ccr_from_device = config_port | (config_mem << 2) | dreq;
- imxdma->ccr_to_device = config_mem | (config_port << 2) | dreq;
-
- imx_dmav1_writel(dmareq, DMA_RSSR(channel));
-
- return 0;
-}
-EXPORT_SYMBOL(imx_dma_config_channel);
-
-void imx_dma_config_burstlen(int channel, unsigned int burstlen)
-{
- imx_dmav1_writel(burstlen, DMA_BLR(channel));
-}
-EXPORT_SYMBOL(imx_dma_config_burstlen);
-
-/**
- * imx_dma_setup_handlers - setup i.MX DMA channel end and error notification
- * handlers
- * @channel: 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(int channel,
- void (*irq_handler) (int, void *),
- void (*err_handler) (int, void *, int),
- void *data)
-{
- struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
- unsigned long flags;
-
- if (!imxdma->name) {
- printk(KERN_CRIT "%s: called for not allocated channel %d\n",
- __func__, channel);
- return -ENODEV;
- }
-
- local_irq_save(flags);
- imx_dmav1_writel(1 << channel, DMA_DISR);
- imxdma->irq_handler = irq_handler;
- imxdma->err_handler = err_handler;
- imxdma->data = data;
- local_irq_restore(flags);
- return 0;
-}
-EXPORT_SYMBOL(imx_dma_setup_handlers);
-
-/**
- * imx_dma_setup_progression_handler - setup i.MX DMA channel progression
- * handlers
- * @channel: i.MX DMA channel number
- * @prog_handler: the pointer to the function called if the transfer progresses
- */
-int
-imx_dma_setup_progression_handler(int channel,
- void (*prog_handler) (int, void*, struct scatterlist*))
-{
- struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
- unsigned long flags;
-
- if (!imxdma->name) {
- printk(KERN_CRIT "%s: called for not allocated channel %d\n",
- __func__, channel);
- return -ENODEV;
- }
-
- local_irq_save(flags);
- imxdma->prog_handler = prog_handler;
- local_irq_restore(flags);
- return 0;
-}
-EXPORT_SYMBOL(imx_dma_setup_progression_handler);
-
-/**
- * imx_dma_enable - function to start i.MX DMA channel operation
- * @channel: 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(channel), %RSSR(channel) and %CCR(channel) has to
- * be set prior this function call by the channel user.
- */
-void imx_dma_enable(int channel)
-{
- struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
- unsigned long flags;
-
- pr_debug("imxdma%d: imx_dma_enable\n", channel);
-
- if (!imxdma->name) {
- printk(KERN_CRIT "%s: called for not allocated channel %d\n",
- __func__, channel);
- return;
- }
-
- if (imxdma->in_use)
- return;
-
- local_irq_save(flags);
-
- imx_dmav1_writel(1 << channel, DMA_DISR);
- imx_dmav1_writel(imx_dmav1_readl(DMA_DIMR) & ~(1 << channel), DMA_DIMR);
- imx_dmav1_writel(imx_dmav1_readl(DMA_CCR(channel)) | CCR_CEN |
- CCR_ACRPT, DMA_CCR(channel));
-
- if ((cpu_is_mx21() || cpu_is_mx27()) &&
- imxdma->sg && imx_dma_hw_chain(imxdma)) {
- imxdma->sg = sg_next(imxdma->sg);
- if (imxdma->sg) {
- u32 tmp;
- imx_dma_sg_next(channel, imxdma->sg);
- tmp = imx_dmav1_readl(DMA_CCR(channel));
- imx_dmav1_writel(tmp | CCR_RPT | CCR_ACRPT,
- DMA_CCR(channel));
- }
- }
- imxdma->in_use = 1;
-
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL(imx_dma_enable);
-
-/**
- * imx_dma_disable - stop, finish i.MX DMA channel operatin
- * @channel: i.MX DMA channel number
- */
-void imx_dma_disable(int channel)
-{
- struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
- unsigned long flags;
-
- pr_debug("imxdma%d: imx_dma_disable\n", channel);
-
- if (imx_dma_hw_chain(imxdma))
- del_timer(&imxdma->watchdog);
-
- local_irq_save(flags);
- imx_dmav1_writel(imx_dmav1_readl(DMA_DIMR) | (1 << channel), DMA_DIMR);
- imx_dmav1_writel(imx_dmav1_readl(DMA_CCR(channel)) & ~CCR_CEN,
- DMA_CCR(channel));
- imx_dmav1_writel(1 << channel, DMA_DISR);
- imxdma->in_use = 0;
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL(imx_dma_disable);
-
-static void imx_dma_watchdog(unsigned long chno)
-{
- struct imx_dma_channel *imxdma = &imx_dma_channels[chno];
-
- imx_dmav1_writel(0, DMA_CCR(chno));
- imxdma->in_use = 0;
- imxdma->sg = NULL;
-
- if (imxdma->err_handler)
- imxdma->err_handler(chno, imxdma->data, IMX_DMA_ERR_TIMEOUT);
-}
-
-static irqreturn_t dma_err_handler(int irq, void *dev_id)
-{
- int i, disr;
- struct imx_dma_channel *imxdma;
- unsigned int err_mask;
- int errcode;
-
- disr = imx_dmav1_readl(DMA_DISR);
-
- err_mask = imx_dmav1_readl(DMA_DBTOSR) |
- imx_dmav1_readl(DMA_DRTOSR) |
- imx_dmav1_readl(DMA_DSESR) |
- imx_dmav1_readl(DMA_DBOSR);
-
- if (!err_mask)
- return IRQ_HANDLED;
-
- imx_dmav1_writel(disr & err_mask, DMA_DISR);
-
- for (i = 0; i < IMX_DMA_CHANNELS; i++) {
- if (!(err_mask & (1 << i)))
- continue;
- imxdma = &imx_dma_channels[i];
- errcode = 0;
-
- if (imx_dmav1_readl(DMA_DBTOSR) & (1 << i)) {
- imx_dmav1_writel(1 << i, DMA_DBTOSR);
- errcode |= IMX_DMA_ERR_BURST;
- }
- if (imx_dmav1_readl(DMA_DRTOSR) & (1 << i)) {
- imx_dmav1_writel(1 << i, DMA_DRTOSR);
- errcode |= IMX_DMA_ERR_REQUEST;
- }
- if (imx_dmav1_readl(DMA_DSESR) & (1 << i)) {
- imx_dmav1_writel(1 << i, DMA_DSESR);
- errcode |= IMX_DMA_ERR_TRANSFER;
- }
- if (imx_dmav1_readl(DMA_DBOSR) & (1 << i)) {
- imx_dmav1_writel(1 << i, DMA_DBOSR);
- errcode |= IMX_DMA_ERR_BUFFER;
- }
- if (imxdma->name && imxdma->err_handler) {
- imxdma->err_handler(i, imxdma->data, errcode);
- continue;
- }
-
- imx_dma_channels[i].sg = NULL;
-
- printk(KERN_WARNING
- "DMA timeout on channel %d (%s) -%s%s%s%s\n",
- i, imxdma->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 void dma_irq_handle_channel(int chno)
-{
- struct imx_dma_channel *imxdma = &imx_dma_channels[chno];
-
- if (!imxdma->name) {
- /*
- * IRQ for an unregistered DMA channel:
- * let's clear the interrupts and disable it.
- */
- printk(KERN_WARNING
- "spurious IRQ for DMA channel %d\n", chno);
- return;
- }
-
- if (imxdma->sg) {
- u32 tmp;
- struct scatterlist *current_sg = imxdma->sg;
- imxdma->sg = sg_next(imxdma->sg);
-
- if (imxdma->sg) {
- imx_dma_sg_next(chno, imxdma->sg);
-
- tmp = imx_dmav1_readl(DMA_CCR(chno));
-
- if (imx_dma_hw_chain(imxdma)) {
- /* FIXME: The timeout should probably be
- * configurable
- */
- mod_timer(&imxdma->watchdog,
- jiffies + msecs_to_jiffies(500));
-
- tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT;
- imx_dmav1_writel(tmp, DMA_CCR(chno));
- } else {
- imx_dmav1_writel(tmp & ~CCR_CEN, DMA_CCR(chno));
- tmp |= CCR_CEN;
- }
-
- imx_dmav1_writel(tmp, DMA_CCR(chno));
-
- if (imxdma->prog_handler)
- imxdma->prog_handler(chno, imxdma->data,
- current_sg);
-
- return;
- }
-
- if (imx_dma_hw_chain(imxdma)) {
- del_timer(&imxdma->watchdog);
- return;
- }
- }
-
- imx_dmav1_writel(0, DMA_CCR(chno));
- imxdma->in_use = 0;
- if (imxdma->irq_handler)
- imxdma->irq_handler(chno, imxdma->data);
-}
-
-static irqreturn_t dma_irq_handler(int irq, void *dev_id)
-{
- int i, disr;
-
- if (cpu_is_mx21() || cpu_is_mx27())
- dma_err_handler(irq, dev_id);
-
- disr = imx_dmav1_readl(DMA_DISR);
-
- pr_debug("imxdma: dma_irq_handler called, disr=0x%08x\n",
- disr);
-
- imx_dmav1_writel(disr, DMA_DISR);
- for (i = 0; i < IMX_DMA_CHANNELS; i++) {
- if (disr & (1 << i))
- dma_irq_handle_channel(i);
- }
-
- return IRQ_HANDLED;
-}
-
-/**
- * imx_dma_request - request/allocate specified channel number
- * @channel: i.MX DMA channel number
- * @name: the driver/caller own non-%NULL identification
- */
-int imx_dma_request(int channel, const char *name)
-{
- struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
- unsigned long flags;
- int ret = 0;
-
- /* basic sanity checks */
- if (!name)
- return -EINVAL;
-
- if (channel >= IMX_DMA_CHANNELS) {
- printk(KERN_CRIT "%s: called for non-existed channel %d\n",
- __func__, channel);
- return -EINVAL;
- }
-
- local_irq_save(flags);
- if (imxdma->name) {
- local_irq_restore(flags);
- return -EBUSY;
- }
- memset(imxdma, 0, sizeof(*imxdma));
- imxdma->name = name;
- local_irq_restore(flags); /* request_irq() can block */
-
- if (cpu_is_mx21() || cpu_is_mx27()) {
- ret = request_irq(MX2x_INT_DMACH0 + channel,
- dma_irq_handler, 0, "DMA", NULL);
- if (ret) {
- imxdma->name = NULL;
- pr_crit("Can't register IRQ %d for DMA channel %d\n",
- MX2x_INT_DMACH0 + channel, channel);
- return ret;
- }
- init_timer(&imxdma->watchdog);
- imxdma->watchdog.function = &imx_dma_watchdog;
- imxdma->watchdog.data = channel;
- }
-
- return ret;
-}
-EXPORT_SYMBOL(imx_dma_request);
-
-/**
- * imx_dma_free - release previously acquired channel
- * @channel: i.MX DMA channel number
- */
-void imx_dma_free(int channel)
-{
- unsigned long flags;
- struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
-
- if (!imxdma->name) {
- printk(KERN_CRIT
- "%s: trying to free free channel %d\n",
- __func__, channel);
- return;
- }
-
- local_irq_save(flags);
- /* Disable interrupts */
- imx_dma_disable(channel);
- imxdma->name = NULL;
-
- if (cpu_is_mx21() || cpu_is_mx27())
- free_irq(MX2x_INT_DMACH0 + channel, NULL);
-
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL(imx_dma_free);
-
-/**
- * imx_dma_request_by_prio - find and request some of free channels best
- * suiting requested priority
- * @channel: i.MX DMA channel number
- * @name: the driver/caller own non-%NULL identification
- *
- * This function tries to find a 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.
- */
-int imx_dma_request_by_prio(const char *name, enum 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;
-}
-EXPORT_SYMBOL(imx_dma_request_by_prio);
-
-static int __init imx_dma_init(void)
-{
- int ret = 0;
- int i;
-
- if (cpu_is_mx1())
- imx_dmav1_baseaddr = MX1_IO_ADDRESS(MX1_DMA_BASE_ADDR);
- else if (cpu_is_mx21())
- imx_dmav1_baseaddr = MX21_IO_ADDRESS(MX21_DMA_BASE_ADDR);
- else if (cpu_is_mx27())
- imx_dmav1_baseaddr = MX27_IO_ADDRESS(MX27_DMA_BASE_ADDR);
- else
- return 0;
-
- dma_clk = clk_get(NULL, "dma");
- if (IS_ERR(dma_clk))
- return PTR_ERR(dma_clk);
- clk_enable(dma_clk);
-
- /* reset DMA module */
- imx_dmav1_writel(DCR_DRST, DMA_DCR);
-
- if (cpu_is_mx1()) {
- ret = request_irq(MX1_DMA_INT, dma_irq_handler, 0, "DMA", NULL);
- if (ret) {
- pr_crit("Wow! Can't register IRQ for DMA\n");
- return ret;
- }
-
- ret = request_irq(MX1_DMA_ERR, dma_err_handler, 0, "DMA", NULL);
- if (ret) {
- pr_crit("Wow! Can't register ERRIRQ for DMA\n");
- free_irq(MX1_DMA_INT, NULL);
- return ret;
- }
- }
-
- /* enable DMA module */
- imx_dmav1_writel(DCR_DEN, DMA_DCR);
-
- /* clear all interrupts */
- imx_dmav1_writel((1 << IMX_DMA_CHANNELS) - 1, DMA_DISR);
-
- /* disable interrupts */
- imx_dmav1_writel((1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR);
-
- 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);