patch 1: move the mxs dma header to a more common place.
Beside the mx23/mx28, the apbh-dma is also used by MX50 and MX6Q.
So move the mxs dma header file to a more common place, and rename
it to mxs-dma.h
patch 2: rewrite the last parameter of mxs_dma_prep_slave_sg().
In the new GPMI version, some hardware behavior changes.
The WAIT4END bit should be set in the middle one of the ECC READ page DMA chain.
The DMA chain should be set like this:
+-----+ +-----+ +-----+
| cmd | ------------> | cmd | ------------------> | cmd |
+-----+ +-----+ +-----+
^ ^
| |
| |
set WAIT4END here too set WAIT4END here
So rewrite the last parameter of mxs_dma_prep_slave_sg(), use the
dma_ctrl_flags to set the proper DMA bit for DMA Command Structure.
And change the relative drivers with the dma_ctrl_flags.
TEST:
Tested the mxs-mmc driver and gpmi-nand drive with the two patches
in MX28 board.
v5 --> v6:
[1] create this patch set based on the mainline.
v4 --> v5:
[1] remove GPMI_IS_MX6Q(), make the mxs and mx6q use the same code.
v3 --> v4:
[1] create a new folder include/linux/fsl/ for store the Freescale's
header files.
[2] add more CCs.
v2 --> v3:
[1] remove field gpmi_version, use GPMI_IS_MX6Q() instead.
v1 --> v2:
[1] squash the trial patches into single patch.
[2] use the dma_ctrl_flags.
Huang Shijie (2):
mxs-dma : move the mxs dma.h to a more common place
mxs-dma : rewrite the last parameter of mxs_dma_prep_slave_sg()
drivers/dma/mxs-dma.c | 34 +++++++++++++++++---
drivers/mmc/host/mxs-mmc.c | 12 +++---
drivers/mtd/nand/gpmi-nand/gpmi-lib.c | 19 +++++++---
drivers/mtd/nand/gpmi-nand/gpmi-nand.h | 2 +-
.../mach/dma.h => include/linux/fsl/mxs-dma.h | 0
sound/soc/mxs/mxs-pcm.c | 2 +-
sound/soc/mxs/mxs-pcm.h | 2 +-
sound/soc/mxs/mxs-saif.c | 2 +-
8 files changed, 52 insertions(+), 21 deletions(-)
rename arch/arm/mach-mxs/include/mach/dma.h => include/linux/fsl/mxs-dma.h (100%)
--
1.7.3.2
Move the header to a more common place.
The mxs dma engine is not only used in mx23/mx28, but also used
in mx50/mx6q. It will also be used in the future chips.
Rename it to mxs-dma.h, and create a new folder include/linux/fsl/ to
store the Freescale's header files.
change mxs-dma driver, mxs-mmc driver, gpmi-nand driver, mxs-saif driver
to the new header file.
Acked-by: Shawn Guo <[email protected]>
Acked-by: Mark Brown <[email protected]>
Signed-off-by: Huang Shijie <[email protected]>
---
drivers/dma/mxs-dma.c | 2 +-
drivers/mmc/host/mxs-mmc.c | 2 +-
drivers/mtd/nand/gpmi-nand/gpmi-nand.h | 2 +-
.../mach/dma.h => include/linux/fsl/mxs-dma.h | 0
sound/soc/mxs/mxs-pcm.c | 2 +-
sound/soc/mxs/mxs-pcm.h | 2 +-
sound/soc/mxs/mxs-saif.c | 2 +-
7 files changed, 6 insertions(+), 6 deletions(-)
rename arch/arm/mach-mxs/include/mach/dma.h => include/linux/fsl/mxs-dma.h (100%)
diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index b06cd4c..0afcedb 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -22,10 +22,10 @@
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
#include <linux/delay.h>
+#include <linux/fsl/mxs-dma.h>
#include <asm/irq.h>
#include <mach/mxs.h>
-#include <mach/dma.h>
#include <mach/common.h>
/*
diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 382c835..e5ea2b1 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -38,10 +38,10 @@
#include <linux/gpio.h>
#include <linux/regulator/consumer.h>
#include <linux/module.h>
+#include <linux/fsl/mxs-dma.h>
#include <mach/mxs.h>
#include <mach/common.h>
-#include <mach/dma.h>
#include <mach/mmc.h>
#define DRIVER_NAME "mxs-mmc"
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
index e023bcc..ec6180d 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
@@ -20,7 +20,7 @@
#include <linux/mtd/nand.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
-#include <mach/dma.h>
+#include <linux/fsl/mxs-dma.h>
struct resources {
void *gpmi_regs;
diff --git a/arch/arm/mach-mxs/include/mach/dma.h b/include/linux/fsl/mxs-dma.h
similarity index 100%
rename from arch/arm/mach-mxs/include/mach/dma.h
rename to include/linux/fsl/mxs-dma.h
diff --git a/sound/soc/mxs/mxs-pcm.c b/sound/soc/mxs/mxs-pcm.c
index 105f42a..420715e 100644
--- a/sound/soc/mxs/mxs-pcm.c
+++ b/sound/soc/mxs/mxs-pcm.c
@@ -28,6 +28,7 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dmaengine.h>
+#include <linux/fsl/mxs-dma.h>
#include <sound/core.h>
#include <sound/initval.h>
@@ -35,7 +36,6 @@
#include <sound/pcm_params.h>
#include <sound/soc.h>
-#include <mach/dma.h>
#include "mxs-pcm.h"
static struct snd_pcm_hardware snd_mxs_hardware = {
diff --git a/sound/soc/mxs/mxs-pcm.h b/sound/soc/mxs/mxs-pcm.h
index f55ac4f..d2c8b12 100644
--- a/sound/soc/mxs/mxs-pcm.h
+++ b/sound/soc/mxs/mxs-pcm.h
@@ -19,7 +19,7 @@
#ifndef _MXS_PCM_H
#define _MXS_PCM_H
-#include <mach/dma.h>
+#include <linux/fsl/mxs-dma.h>
struct mxs_pcm_dma_params {
int chan_irq;
diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c
index f204dba..ce59112 100644
--- a/sound/soc/mxs/mxs-saif.c
+++ b/sound/soc/mxs/mxs-saif.c
@@ -24,12 +24,12 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/time.h>
+#include <linux/fsl/mxs-dma.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/saif.h>
-#include <mach/dma.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <mach/mxs.h>
--
1.7.3.2
[1] Background :
The GPMI does ECC read page operation with a DMA chain consist of three DMA
Command Structures. The middle one of the chain is used to enable the BCH,
and read out the NAND page.
The WAIT4END(wait for command end) is a comunication signal between
the GPMI and MXS-DMA.
[2] The current DMA code sets the WAIT4END bit at the last one, such as:
+-----+ +-----+ +-----+
| cmd | ------------> | cmd | ------------------> | cmd |
+-----+ +-----+ +-----+
^
|
|
set WAIT4END here
This chain works fine in the mx23/mx28.
[3] But in the new GPMI version (used in MX50/MX60), the WAIT4END bit should
be set not only at the last DMA Command Structure,
but also at the middle one, such as:
+-----+ +-----+ +-----+
| cmd | ------------> | cmd | ------------------> | cmd |
+-----+ +-----+ +-----+
^ ^
| |
| |
set WAIT4END here too set WAIT4END here
If we do not set WAIT4END, the BCH maybe stalls in "ECC reading page" state.
In the next ECC write page operation, a DMA-timeout occurs.
This has been catched in the MX6Q board.
[4] In order to fix the bug, rewrite the last parameter of mxs_dma_prep_slave_sg(),
and use the dma_ctrl_flags:
---------------------------------------------------------
DMA_PREP_INTERRUPT : append a new DMA Command Structrue.
DMA_CTRL_ACK : set the WAIT4END bit for this DMA Command Structure.
---------------------------------------------------------
[5] changes to the relative drivers:
<1> For mxs-mmc driver, just use the new flags, do not change any logic.
<2> For gpmi-nand driver, and use the new flags to set the DMA
chain, especially for ecc read page.
Acked-by: Shawn Guo <[email protected]>
Signed-off-by: Huang Shijie <[email protected]>
---
drivers/dma/mxs-dma.c | 32 ++++++++++++++++++++++++++++----
drivers/mmc/host/mxs-mmc.c | 10 +++++-----
drivers/mtd/nand/gpmi-nand/gpmi-lib.c | 19 +++++++++++++------
3 files changed, 46 insertions(+), 15 deletions(-)
diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index 0afcedb..0ddfd30 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -349,10 +349,32 @@ static void mxs_dma_free_chan_resources(struct dma_chan *chan)
clk_disable_unprepare(mxs_dma->clk);
}
+/*
+ * How to use the flags for ->device_prep_slave_sg() :
+ * [1] If there is only one DMA command in the DMA chain, the code should be:
+ * ......
+ * ->device_prep_slave_sg(DMA_CTRL_ACK);
+ * ......
+ * [2] If there are two DMA commands in the DMA chain, the code should be
+ * ......
+ * ->device_prep_slave_sg(0);
+ * ......
+ * ->device_prep_slave_sg(DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ * ......
+ * [3] If there are more than two DMA commands in the DMA chain, the code
+ * should be:
+ * ......
+ * ->device_prep_slave_sg(0); // First
+ * ......
+ * ->device_prep_slave_sg(DMA_PREP_INTERRUPT [| DMA_CTRL_ACK]);
+ * ......
+ * ->device_prep_slave_sg(DMA_PREP_INTERRUPT | DMA_CTRL_ACK); // Last
+ * ......
+ */
static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
- unsigned long append)
+ unsigned long flags)
{
struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
@@ -360,6 +382,7 @@ static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
struct scatterlist *sg;
int i, j;
u32 *pio;
+ bool append = flags & DMA_PREP_INTERRUPT;
int idx = append ? mxs_chan->desc_count : 0;
if (mxs_chan->status == DMA_IN_PROGRESS && !append)
@@ -386,7 +409,6 @@ static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
ccw->bits |= CCW_CHAIN;
ccw->bits &= ~CCW_IRQ;
ccw->bits &= ~CCW_DEC_SEM;
- ccw->bits &= ~CCW_WAIT4END;
} else {
idx = 0;
}
@@ -401,7 +423,8 @@ static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
ccw->bits = 0;
ccw->bits |= CCW_IRQ;
ccw->bits |= CCW_DEC_SEM;
- ccw->bits |= CCW_WAIT4END;
+ if (flags & DMA_CTRL_ACK)
+ ccw->bits |= CCW_WAIT4END;
ccw->bits |= CCW_HALT_ON_TERM;
ccw->bits |= CCW_TERM_FLUSH;
ccw->bits |= BF_CCW(sg_len, PIO_NUM);
@@ -432,7 +455,8 @@ static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
ccw->bits &= ~CCW_CHAIN;
ccw->bits |= CCW_IRQ;
ccw->bits |= CCW_DEC_SEM;
- ccw->bits |= CCW_WAIT4END;
+ if (flags & DMA_CTRL_ACK)
+ ccw->bits |= CCW_WAIT4END;
}
}
}
diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index e5ea2b1..4062812 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -305,7 +305,7 @@ static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id)
}
static struct dma_async_tx_descriptor *mxs_mmc_prep_dma(
- struct mxs_mmc_host *host, unsigned int append)
+ struct mxs_mmc_host *host, unsigned long flags)
{
struct dma_async_tx_descriptor *desc;
struct mmc_data *data = host->data;
@@ -325,7 +325,7 @@ static struct dma_async_tx_descriptor *mxs_mmc_prep_dma(
}
desc = host->dmach->device->device_prep_slave_sg(host->dmach,
- sgl, sg_len, host->slave_dirn, append);
+ sgl, sg_len, host->slave_dirn, flags);
if (desc) {
desc->callback = mxs_mmc_dma_irq_callback;
desc->callback_param = host;
@@ -358,7 +358,7 @@ static void mxs_mmc_bc(struct mxs_mmc_host *host)
host->ssp_pio_words[2] = cmd1;
host->dma_dir = DMA_NONE;
host->slave_dirn = DMA_TRANS_NONE;
- desc = mxs_mmc_prep_dma(host, 0);
+ desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK);
if (!desc)
goto out;
@@ -398,7 +398,7 @@ static void mxs_mmc_ac(struct mxs_mmc_host *host)
host->ssp_pio_words[2] = cmd1;
host->dma_dir = DMA_NONE;
host->slave_dirn = DMA_TRANS_NONE;
- desc = mxs_mmc_prep_dma(host, 0);
+ desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK);
if (!desc)
goto out;
@@ -526,7 +526,7 @@ static void mxs_mmc_adtc(struct mxs_mmc_host *host)
host->data = data;
host->dma_dir = dma_data_dir;
host->slave_dirn = slave_dirn;
- desc = mxs_mmc_prep_dma(host, 1);
+ desc = mxs_mmc_prep_dma(host, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc)
goto out;
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
index 7db6555..5e3c505 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
@@ -849,7 +849,9 @@ int gpmi_send_command(struct gpmi_nand_data *this)
sg_init_one(sgl, this->cmd_buffer, this->command_length);
dma_map_sg(this->dev, sgl, 1, DMA_TO_DEVICE);
desc = channel->device->device_prep_slave_sg(channel,
- sgl, 1, DMA_MEM_TO_DEV, 1);
+ sgl, 1, DMA_MEM_TO_DEV,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+
if (!desc) {
pr_err("step 2 error\n");
return -1;
@@ -891,7 +893,8 @@ int gpmi_send_data(struct gpmi_nand_data *this)
/* [2] send DMA request */
prepare_data_dma(this, DMA_TO_DEVICE);
desc = channel->device->device_prep_slave_sg(channel, &this->data_sgl,
- 1, DMA_MEM_TO_DEV, 1);
+ 1, DMA_MEM_TO_DEV,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
pr_err("step 2 error\n");
return -1;
@@ -927,7 +930,8 @@ int gpmi_read_data(struct gpmi_nand_data *this)
/* [2] : send DMA request */
prepare_data_dma(this, DMA_FROM_DEVICE);
desc = channel->device->device_prep_slave_sg(channel, &this->data_sgl,
- 1, DMA_DEV_TO_MEM, 1);
+ 1, DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
pr_err("step 2 error\n");
return -1;
@@ -974,7 +978,8 @@ int gpmi_send_page(struct gpmi_nand_data *this,
desc = channel->device->device_prep_slave_sg(channel,
(struct scatterlist *)pio,
- ARRAY_SIZE(pio), DMA_TRANS_NONE, 0);
+ ARRAY_SIZE(pio), DMA_TRANS_NONE,
+ DMA_CTRL_ACK);
if (!desc) {
pr_err("step 2 error\n");
return -1;
@@ -1038,7 +1043,8 @@ int gpmi_read_page(struct gpmi_nand_data *this,
pio[5] = auxiliary;
desc = channel->device->device_prep_slave_sg(channel,
(struct scatterlist *)pio,
- ARRAY_SIZE(pio), DMA_TRANS_NONE, 1);
+ ARRAY_SIZE(pio), DMA_TRANS_NONE,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
pr_err("step 2 error\n");
return -1;
@@ -1057,7 +1063,8 @@ int gpmi_read_page(struct gpmi_nand_data *this,
pio[1] = 0;
desc = channel->device->device_prep_slave_sg(channel,
(struct scatterlist *)pio, 2,
- DMA_TRANS_NONE, 1);
+ DMA_TRANS_NONE,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
pr_err("step 3 error\n");
return -1;
--
1.7.3.2
Hi:
ping.
Any comment about this patch set?
thanks
Huang Shijie
> patch 1: move the mxs dma header to a more common place.
> Beside the mx23/mx28, the apbh-dma is also used by MX50 and MX6Q.
> So move the mxs dma header file to a more common place, and rename
> it to mxs-dma.h
>
> patch 2: rewrite the last parameter of mxs_dma_prep_slave_sg().
> In the new GPMI version, some hardware behavior changes.
> The WAIT4END bit should be set in the middle one of the ECC READ page DMA chain.
> The DMA chain should be set like this:
>
> +-----+ +-----+ +-----+
> | cmd | ------------> | cmd | ------------------> | cmd |
> +-----+ +-----+ +-----+
> ^ ^
> | |
> | |
> set WAIT4END here too set WAIT4END here
>
> So rewrite the last parameter of mxs_dma_prep_slave_sg(), use the
> dma_ctrl_flags to set the proper DMA bit for DMA Command Structure.
> And change the relative drivers with the dma_ctrl_flags.
>
> TEST:
> Tested the mxs-mmc driver and gpmi-nand drive with the two patches
> in MX28 board.
>
> v5 --> v6:
> [1] create this patch set based on the mainline.
>
> v4 --> v5:
> [1] remove GPMI_IS_MX6Q(), make the mxs and mx6q use the same code.
>
> v3 --> v4:
> [1] create a new folder include/linux/fsl/ for store the Freescale's
> header files.
> [2] add more CCs.
>
> v2 --> v3:
> [1] remove field gpmi_version, use GPMI_IS_MX6Q() instead.
>
> v1 --> v2:
> [1] squash the trial patches into single patch.
> [2] use the dma_ctrl_flags.
>
>
> Huang Shijie (2):
> mxs-dma : move the mxs dma.h to a more common place
> mxs-dma : rewrite the last parameter of mxs_dma_prep_slave_sg()
>
> drivers/dma/mxs-dma.c | 34 +++++++++++++++++---
> drivers/mmc/host/mxs-mmc.c | 12 +++---
> drivers/mtd/nand/gpmi-nand/gpmi-lib.c | 19 +++++++---
> drivers/mtd/nand/gpmi-nand/gpmi-nand.h | 2 +-
> .../mach/dma.h => include/linux/fsl/mxs-dma.h | 0
> sound/soc/mxs/mxs-pcm.c | 2 +-
> sound/soc/mxs/mxs-pcm.h | 2 +-
> sound/soc/mxs/mxs-saif.c | 2 +-
> 8 files changed, 52 insertions(+), 21 deletions(-)
> rename arch/arm/mach-mxs/include/mach/dma.h => include/linux/fsl/mxs-dma.h (100%)
>
On Wed, 2012-02-29 at 11:10 +0800, Huang Shijie wrote:
> Hi:
>
> ping.
Is this patch-set independent or requires something like gpma patches?
--
Best Regards,
Artem Bityutskiy
Hi Artem:
> On Wed, 2012-02-29 at 11:10 +0800, Huang Shijie wrote:
>> Hi:
>>
>> ping.
> Is this patch-set independent or requires something like gpma patches?
>
This patch set is independent, and it does not depend upon any other
patches.
I will sent out the new GPMI patches (with DT enable) after this
patch-set is merged.
thanks
BR
Huang Shijie
On Wed, 2012-02-29 at 16:25 +0800, Huang Shijie wrote:
> Hi Artem:
> > On Wed, 2012-02-29 at 11:10 +0800, Huang Shijie wrote:
> >> Hi:
> >>
> >> ping.
> > Is this patch-set independent or requires something like gpma patches?
> >
> This patch set is independent, and it does not depend upon any other
> patches.
Pushed both to l2-mtd.git tree, thanks. I am worried that it touches
other subsystems like dma, sound, and mmc and there are no acks for
those. Would be nice to get them somehow.
--
Best Regards,
Artem Bityutskiy
Hi Artem:
On Wed, Feb 29, 2012 at 7:00 AM, Bityutskiy, Artem
<[email protected]> wrote:
> On Wed, 2012-02-29 at 16:25 +0800, Huang Shijie wrote:
>> Hi Artem:
>> > On Wed, 2012-02-29 at 11:10 +0800, Huang Shijie wrote:
>> >> Hi:
>> >>
>> >> ping.
>> > Is this patch-set independent or requires something like gpma patches?
>> >
>> This patch set is independent, and it does not depend upon any other
>> patches.
>
> Pushed both to l2-mtd.git tree, thanks. I am worried that it touches
> other subsystems like dma, sound, and mmc and there are no acks for
> those. Would be nice to get them somehow.
>
I ever thought Vinod could accept this patch set.
To Vinod & Chris:
Could you give the ack to the first patch?
Does the second patch need extra acks beside Shawn's?
BR
Huang Shijie