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Subject[PATCH 01/14] dmaengine: imx-dma: merge old dma-v1.c with imx-dma.c
Date

Signed-off-by: Javier Martin <javier.martin@vista-silicon.com>
---
arch/arm/mach-imx/Kconfig | 6 -
arch/arm/mach-imx/Makefile | 2 -
drivers/dma/Kconfig | 1 -
drivers/dma/imx-dma.c | 591 ++++++++++++++++++++++++++++++++++++++++----
4 files changed, 541 insertions(+), 59 deletions(-)
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 0e6de36..3da1421 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -1,6 +1,3 @@
-config IMX_HAVE_DMA_V1
- bool
-
config HAVE_IMX_GPC
bool

@@ -26,7 +23,6 @@ config SOC_IMX1
bool
select ARCH_MX1
select CPU_ARM920T
- select IMX_HAVE_DMA_V1
select IMX_HAVE_IOMUX_V1
select MXC_AVIC

@@ -35,7 +31,6 @@ config SOC_IMX21
select MACH_MX21
select CPU_ARM926T
select ARCH_MXC_AUDMUX_V1
- select IMX_HAVE_DMA_V1
select IMX_HAVE_IOMUX_V1
select MXC_AVIC

@@ -52,7 +47,6 @@ config SOC_IMX27
select MACH_MX27
select CPU_ARM926T
select ARCH_MXC_AUDMUX_V1
- select IMX_HAVE_DMA_V1
select IMX_HAVE_IOMUX_V1
select MXC_AVIC

diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index f5920c2..a62dc3a 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -1,5 +1,3 @@
-obj-$(CONFIG_IMX_HAVE_DMA_V1) += dma-v1.o
-
obj-$(CONFIG_SOC_IMX1) += clock-imx1.o mm-imx1.o
obj-$(CONFIG_SOC_IMX21) += clock-imx21.o mm-imx21.o

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index f1a2749..eb58b91 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -231,7 +231,6 @@ config IMX_SDMA

config IMX_DMA
tristate "i.MX DMA support"
- depends on IMX_HAVE_DMA_V1
select DMA_ENGINE
help
Support the i.MX DMA engine. This engine is integrated into
diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
index c32103f..28d716c 100644
--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c
@@ -14,7 +14,6 @@
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
-
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
@@ -25,14 +24,88 @@
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
+#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/module.h>

#include <asm/irq.h>
-#include <mach/dma-v1.h>
+#include <mach/dma.h>
#include <mach/hardware.h>

#define IMXDMA_MAX_CHAN_DESCRIPTORS 16
+#define IMX_DMA_CHANNELS 16
+
+#define DMA_MODE_READ 0
+#define DMA_MODE_WRITE 1
+#define DMA_MODE_MASK 1
+
+#define IMX_DMA_LENGTH_LOOP ((unsigned int)-1)
+#define IMX_DMA_MEMSIZE_32 (0 << 4)
+#define IMX_DMA_MEMSIZE_8 (1 << 4)
+#define IMX_DMA_MEMSIZE_16 (2 << 4)
+#define IMX_DMA_TYPE_LINEAR (0 << 10)
+#define IMX_DMA_TYPE_2D (1 << 10)
+#define IMX_DMA_TYPE_FIFO (2 << 10)
+
+#define IMX_DMA_ERR_BURST (1 << 0)
+#define IMX_DMA_ERR_REQUEST (1 << 1)
+#define IMX_DMA_ERR_TRANSFER (1 << 2)
+#define IMX_DMA_ERR_BUFFER (1 << 3)
+#define IMX_DMA_ERR_TIMEOUT (1 << 4)
+
+#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)

enum imxdma_prep_type {
IMXDMA_DESC_MEMCPY,
@@ -41,6 +114,39 @@ enum imxdma_prep_type {
IMXDMA_DESC_CYCLIC,
};

+/*
+ * struct imxdma_channel_internal - 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 imxdma_channel_internal only as extension to it.
+ */
+
+struct imxdma_channel_internal {
+ void *data;
+ unsigned int dma_mode;
+ struct scatterlist *sg;
+ unsigned int resbytes;
+
+ int in_use;
+
+ u32 ccr_from_device;
+ u32 ccr_to_device;
+
+ struct timer_list watchdog;
+
+ int hw_chaining;
+};
+
struct imxdma_desc {
struct list_head node;
struct dma_async_tx_descriptor desc;
@@ -63,9 +169,9 @@ struct imxdma_desc {
};

struct imxdma_channel {
+ struct imxdma_channel_internal internal;
struct imxdma_engine *imxdma;
unsigned int channel;
- unsigned int imxdma_channel;

struct tasklet_struct dma_tasklet;
struct list_head ld_free;
@@ -109,28 +215,381 @@ static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel *imxdmac)
return false;
}

-static void imxdma_irq_handler(int channel, void *data)
+/* TODO: put this inside any struct */
+static void __iomem *imx_dmav1_baseaddr;
+static struct clk *dma_clk;
+
+static void imx_dmav1_writel(unsigned val, unsigned offset)
{
- struct imxdma_channel *imxdmac = data;
+ __raw_writel(val, imx_dmav1_baseaddr + offset);
+}

- tasklet_schedule(&imxdmac->dma_tasklet);
+static unsigned imx_dmav1_readl(unsigned offset)
+{
+ return __raw_readl(imx_dmav1_baseaddr + offset);
}

-static void imxdma_err_handler(int channel, void *data, int error)
+static int imxdma_hw_chain(struct imxdma_channel_internal *imxdma)
{
- struct imxdma_channel *imxdmac = data;
+ if (cpu_is_mx27())
+ return imxdma->hw_chaining;
+ else
+ return 0;
+}
+
+/*
+ * imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation
+ */
+static inline int imxdma_sg_next(struct imxdma_channel *imxdmac, struct scatterlist *sg)
+{
+ struct imxdma_channel_internal *imxdma = &imxdmac->internal;
+ unsigned long now;
+
+ 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(imxdmac->channel));
+ else
+ imx_dmav1_writel(sg->dma_address, DMA_SAR(imxdmac->channel));
+
+ imx_dmav1_writel(now, DMA_CNTR(imxdmac->channel));
+
+ pr_debug("imxdma%d: next sg chunk dst 0x%08x, src 0x%08x, "
+ "size 0x%08x\n", imxdmac->channel,
+ imx_dmav1_readl(DMA_DAR(imxdmac->channel)),
+ imx_dmav1_readl(DMA_SAR(imxdmac->channel)),
+ imx_dmav1_readl(DMA_CNTR(imxdmac->channel)));
+
+ return now;
+}
+
+static int
+imxdma_setup_single_hw(struct imxdma_channel *imxdmac, dma_addr_t dma_address,
+ unsigned int dma_length, unsigned int dev_addr,
+ unsigned int dmamode)
+{
+ int channel = imxdmac->channel;
+
+ imxdmac->internal.sg = NULL;
+ imxdmac->internal.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(imxdmac->internal.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(imxdmac->internal.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;
+}
+
+static void imxdma_enable_hw(struct imxdma_channel *imxdmac)
+{
+ int channel = imxdmac->channel;
+ unsigned long flags;
+
+ pr_debug("imxdma%d: imx_dma_enable\n", channel);
+
+ if (imxdmac->internal.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()) &&
+ imxdmac->internal.sg && imxdma_hw_chain(&imxdmac->internal)) {
+ imxdmac->internal.sg = sg_next(imxdmac->internal.sg);
+ if (imxdmac->internal.sg) {
+ u32 tmp;
+ imxdma_sg_next(imxdmac, imxdmac->internal.sg);
+ tmp = imx_dmav1_readl(DMA_CCR(channel));
+ imx_dmav1_writel(tmp | CCR_RPT | CCR_ACRPT,
+ DMA_CCR(channel));
+ }
+ }
+ imxdmac->internal.in_use = 1;
+
+ local_irq_restore(flags);
+}
+
+static void imxdma_disable_hw(struct imxdma_channel *imxdmac)
+{
+ int channel = imxdmac->channel;
+ unsigned long flags;
+
+ pr_debug("imxdma%d: imx_dma_disable\n", channel);
+
+ if (imxdma_hw_chain(&imxdmac->internal))
+ del_timer(&imxdmac->internal.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);
+ imxdmac->internal.in_use = 0;
+ local_irq_restore(flags);
+}
+
+static int
+imxdma_config_channel_hw(struct imxdma_channel *imxdmac, unsigned int config_port,
+ unsigned int config_mem, unsigned int dmareq, int hw_chaining)
+{
+ int channel = imxdmac->channel;
+ u32 dreq = 0;
+
+ imxdmac->internal.hw_chaining = 0;
+
+ if (hw_chaining) {
+ imxdmac->internal.hw_chaining = 1;
+ if (!imxdma_hw_chain(&imxdmac->internal))
+ return -EINVAL;
+ }
+
+ if (dmareq)
+ dreq = CCR_REN;
+
+ imxdmac->internal.ccr_from_device = config_port | (config_mem << 2) | dreq;
+ imxdmac->internal.ccr_to_device = config_mem | (config_port << 2) | dreq;
+
+ imx_dmav1_writel(dmareq, DMA_RSSR(channel));
+
+ return 0;
+}
+
+static int
+imxdma_setup_sg_hw(struct imxdma_channel *imxdmac,
+ struct scatterlist *sg, unsigned int sgcount,
+ unsigned int dma_length, unsigned int dev_addr,
+ unsigned int dmamode)
+{
+ int channel = imxdmac->channel;
+
+ if (imxdmac->internal.in_use)
+ return -EBUSY;
+
+ imxdmac->internal.sg = sg;
+ imxdmac->internal.dma_mode = dmamode;
+ imxdmac->internal.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(imxdmac->internal.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(imxdmac->internal.ccr_to_device, DMA_CCR(channel));
+ } else {
+ printk(KERN_ERR "imxdma%d: imx_dma_setup_sg bad dmamode\n",
+ channel);
+ return -EINVAL;
+ }
+
+ imxdma_sg_next(imxdmac, sg);
+
+ return 0;
+}
+
+static void imxdma_watchdog(unsigned long data)
+{
+ struct imxdma_channel *imxdmac = (struct imxdma_channel *)data;
+ int channel = imxdmac->channel;
+
+ imx_dmav1_writel(0, DMA_CCR(channel));
+ imxdmac->internal.in_use = 0;
+ imxdmac->internal.sg = NULL;
+
+ /* Tasklet watchdog error handler */
tasklet_schedule(&imxdmac->dma_tasklet);
+ pr_debug("imxdma%d: watchdog timeout!\n", imxdmac->channel);
+}
+
+static irqreturn_t imxdma_err_handler(int irq, void *dev_id)
+{
+ struct imxdma_engine *imxdma = dev_id;
+ struct imxdma_channel_internal *internal;
+ unsigned int err_mask;
+ int i, disr;
+ 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;
+ internal = &imxdma->channel[i].internal;
+ 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;
+ }
+ /* Tasklet error handler */
+ tasklet_schedule(&imxdma->channel[i].dma_tasklet);
+
+ printk(KERN_WARNING
+ "DMA timeout on channel %d -%s%s%s%s\n", i,
+ 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 imxdma_progression(int channel, void *data,
- struct scatterlist *sg)
+static void dma_irq_handle_channel(struct imxdma_channel *imxdmac)
{
- struct imxdma_channel *imxdmac = data;
+ struct imxdma_channel_internal *imxdma = &imxdmac->internal;
+ int chno = imxdmac->channel;
+
+ if (imxdma->sg) {
+ u32 tmp;
+ imxdma->sg = sg_next(imxdma->sg);
+
+ if (imxdma->sg) {
+ imxdma_sg_next(imxdmac, imxdma->sg);
+
+ tmp = imx_dmav1_readl(DMA_CCR(chno));
+
+ if (imxdma_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_chan_is_doing_cyclic(imxdmac))
+ /* Tasklet progression */
+ tasklet_schedule(&imxdmac->dma_tasklet);
+
+ return;
+ }

+ if (imxdma_hw_chain(imxdma)) {
+ del_timer(&imxdma->watchdog);
+ return;
+ }
+ }
+
+ imx_dmav1_writel(0, DMA_CCR(chno));
+ imxdma->in_use = 0;
+ /* Tasklet irq */
tasklet_schedule(&imxdmac->dma_tasklet);
}

+static irqreturn_t dma_irq_handler(int irq, void *dev_id)
+{
+ struct imxdma_engine *imxdma = dev_id;
+ struct imxdma_channel_internal *internal;
+ int i, disr;
+
+ if (cpu_is_mx21() || cpu_is_mx27())
+ imxdma_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)) {
+ internal = &imxdma->channel[i].internal;
+ dma_irq_handle_channel(&imxdma->channel[i]);
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
static int imxdma_xfer_desc(struct imxdma_desc *d)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
@@ -139,31 +598,24 @@ static int imxdma_xfer_desc(struct imxdma_desc *d)
/* Configure and enable */
switch (d->type) {
case IMXDMA_DESC_MEMCPY:
- ret = imx_dma_config_channel(imxdmac->imxdma_channel,
+ ret = imxdma_config_channel_hw(imxdmac,
d->config_port, d->config_mem, 0, 0);
if (ret < 0)
return ret;
- ret = imx_dma_setup_single(imxdmac->imxdma_channel, d->src,
+ ret = imxdma_setup_single_hw(imxdmac, d->src,
d->len, d->dest, d->dmamode);
if (ret < 0)
return ret;
break;
+
+ /* Cyclic transfer is the same as slave_sg with special sg configuration. */
case IMXDMA_DESC_CYCLIC:
- ret = imx_dma_setup_progression_handler(imxdmac->imxdma_channel,
- imxdma_progression);
- if (ret < 0)
- return ret;
- /*
- * We fall through here since cyclic transfer is the same as
- * slave_sg adding a progression handler and a specific sg
- * configuration which is done in 'imxdma_prep_dma_cyclic'.
- */
case IMXDMA_DESC_SLAVE_SG:
if (d->dmamode == DMA_MODE_READ)
- ret = imx_dma_setup_sg(imxdmac->imxdma_channel, d->sg,
+ ret = imxdma_setup_sg_hw(imxdmac, d->sg,
d->sgcount, d->len, d->src, d->dmamode);
else
- ret = imx_dma_setup_sg(imxdmac->imxdma_channel, d->sg,
+ ret = imxdma_setup_sg_hw(imxdmac, d->sg,
d->sgcount, d->len, d->dest, d->dmamode);
if (ret < 0)
return ret;
@@ -171,7 +623,7 @@ static int imxdma_xfer_desc(struct imxdma_desc *d)
default:
return -EINVAL;
}
- imx_dma_enable(imxdmac->imxdma_channel);
+ imxdma_enable_hw(imxdmac);
return 0;
}

@@ -223,7 +675,7 @@ static int imxdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,

switch (cmd) {
case DMA_TERMINATE_ALL:
- imx_dma_disable(imxdmac->imxdma_channel);
+ imxdma_disable_hw(imxdmac);

spin_lock_irqsave(&imxdmac->lock, flags);
list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
@@ -253,16 +705,16 @@ static int imxdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
mode = IMX_DMA_MEMSIZE_32;
break;
}
- ret = imx_dma_config_channel(imxdmac->imxdma_channel,
+ ret = imxdma_config_channel_hw(imxdmac,
mode | IMX_DMA_TYPE_FIFO,
IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
imxdmac->dma_request, 1);

if (ret)
return ret;
-
- imx_dma_config_burstlen(imxdmac->imxdma_channel,
- imxdmac->watermark_level * imxdmac->word_size);
+ /* Set burst length */
+ imx_dmav1_writel(imxdmac->watermark_level * imxdmac->word_size,
+ DMA_BLR(imxdmac->channel));

return 0;
default:
@@ -359,7 +811,7 @@ static void imxdma_free_chan_resources(struct dma_chan *chan)

spin_lock_irqsave(&imxdmac->lock, flags);

- imx_dma_disable(imxdmac->imxdma_channel);
+ imxdma_disable_hw(imxdmac);
list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);

@@ -545,10 +997,51 @@ static void imxdma_issue_pending(struct dma_chan *chan)
}

static int __init imxdma_probe(struct platform_device *pdev)
-{
+ {
struct imxdma_engine *imxdma;
int ret, 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", imxdma);
+ if (ret) {
+ pr_crit("Can't register IRQ for DMA\n");
+ return ret;
+ }
+
+ ret = request_irq(MX1_DMA_ERR, imxdma_err_handler, 0, "DMA", imxdma);
+ if (ret) {
+ pr_crit("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);
+
imxdma = kzalloc(sizeof(*imxdma), GFP_KERNEL);
if (!imxdma)
return -ENOMEM;
@@ -562,17 +1055,20 @@ static int __init imxdma_probe(struct platform_device *pdev)
/* Initialize channel parameters */
for (i = 0; i < MAX_DMA_CHANNELS; i++) {
struct imxdma_channel *imxdmac = &imxdma->channel[i];
-
- imxdmac->imxdma_channel = imx_dma_request_by_prio("dmaengine",
- DMA_PRIO_MEDIUM);
- if ((int)imxdmac->channel < 0) {
- ret = -ENODEV;
- goto err_init;
+ memset(&imxdmac->internal, 0, sizeof(imxdmac->internal));
+ if (cpu_is_mx21() || cpu_is_mx27()) {
+ ret = request_irq(MX2x_INT_DMACH0 + i,
+ dma_irq_handler, 0, "DMA", imxdma);
+ if (ret) {
+ pr_crit("Can't register IRQ %d for DMA channel %d\n",
+ MX2x_INT_DMACH0 + i, i);
+ goto err_init;
+ }
+ init_timer(&imxdmac->internal.watchdog);
+ imxdmac->internal.watchdog.function = &imxdma_watchdog;
+ imxdmac->internal.watchdog.data = (unsigned long)imxdmac;
}

- imx_dma_setup_handlers(imxdmac->imxdma_channel,
- imxdma_irq_handler, imxdma_err_handler, imxdmac);
-
imxdmac->imxdma = imxdma;
spin_lock_init(&imxdmac->lock);

@@ -617,10 +1113,8 @@ static int __init imxdma_probe(struct platform_device *pdev)
return 0;

err_init:
- while (--i >= 0) {
- struct imxdma_channel *imxdmac = &imxdma->channel[i];
- imx_dma_free(imxdmac->imxdma_channel);
- }
+ while (--i >= 0)
+ free_irq(MX2x_INT_DMACH0 + i, NULL);

kfree(imxdma);
return ret;
@@ -633,11 +1127,8 @@ static int __exit imxdma_remove(struct platform_device *pdev)

dma_async_device_unregister(&imxdma->dma_device);

- for (i = 0; i < MAX_DMA_CHANNELS; i++) {
- struct imxdma_channel *imxdmac = &imxdma->channel[i];
-
- imx_dma_free(imxdmac->imxdma_channel);
- }
+ for (i = 0; i < MAX_DMA_CHANNELS; i++)
+ free_irq(MX2x_INT_DMACH0 + i, NULL);

kfree(imxdma);

--
1.7.0.4


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  Last update: 2012-03-05 17:21    [from the cache]
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