Re: Linux SPI slave support
On Mon, Jul 16, 2012 at 5:56 AM, Marek Vasut ma...@denx.de wrote: Dear Shubhrajyoti Datta, Hello, On Sat, Jun 30, 2012 at 8:45 AM, Marek Vasut ma...@denx.de wrote: Hello, is there currently any ongoing effort to support SPI slave mode in Linux? If there is none, could you please share any hints that might help me better choose and go in the direction of implementing the SPI slave support? May be you may want to check the archives. You may want to see below before designing. http://permalink.gmane.org/gmane.linux.kernel.spi.devel/7495 [...] So, idea V2: 1) Separate out common parts from struct spi_master 2) Create struct spi_slave 2a) Implement spi_slave_send_message for spi_slave 2b) Implement ? netlink interface to push and pull messages to/from userland ? The protocol won't be done in kernel, but completely in userland. Is this good approach to take? Or maybe 2b can be replaced by blocking read on character device? I think netlink interface might actually be suited quite well for this task. The other option is to have something like a gpio for synchronization. Best regards, Marek Vasut -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ spi-devel-general mailing list spi-devel-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/spi-devel-general
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Re: Linux SPI slave support
Dear Shubhrajyoti Datta, On Mon, Jul 16, 2012 at 5:56 AM, Marek Vasut ma...@denx.de wrote: Dear Shubhrajyoti Datta, Hello, On Sat, Jun 30, 2012 at 8:45 AM, Marek Vasut ma...@denx.de wrote: Hello, is there currently any ongoing effort to support SPI slave mode in Linux? If there is none, could you please share any hints that might help me better choose and go in the direction of implementing the SPI slave support? May be you may want to check the archives. You may want to see below before designing. http://permalink.gmane.org/gmane.linux.kernel.spi.devel/7495 [...] So, idea V2: 1) Separate out common parts from struct spi_master 2) Create struct spi_slave 2a) Implement spi_slave_send_message for spi_slave 2b) Implement ? netlink interface to push and pull messages to/from userland ? The protocol won't be done in kernel, but completely in userland. Is this good approach to take? Or maybe 2b can be replaced by blocking read on character device? I think netlink interface might actually be suited quite well for this task. The other option is to have something like a gpio for synchronization. Synchronisation of what exactly? With my hardware (that doesn't exist yet I guess), the idea is to simply cross-connect the MISO/MOSI pins and connect the CLK signal. Is that possible btw? Thanks! Best regards, Marek Vasut Best regards, Marek Vasut -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ spi-devel-general mailing list spi-devel-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/spi-devel-general
Re: Linux SPI slave support
On Tue, Jul 17, 2012 at 2:22 PM, Marek Vasut ma...@denx.de wrote: Dear Shubhrajyoti Datta, On Mon, Jul 16, 2012 at 5:56 AM, Marek Vasut ma...@denx.de wrote: Dear Shubhrajyoti Datta, [..] The other option is to have something like a gpio for synchronization. Synchronisation of what exactly? With my hardware (that doesn't exist yet I guess), the idea is to simply cross-connect the MISO/MOSI pins and connect the CLK signal. Is that possible btw? IIUC , the clock is to be driven by master. The slave gets the clock. Master knows when to start and stop the transaction. However for the slave the options are to 1) Keep listening always. 2) Use something to syncronize( I may have used the word loosely) master and slave. So that it doesnt have to listen always. Btw it is just a suggestion. I am not opposed to any other implementation. Thanks and Regards, Thanks! -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ spi-devel-general mailing list spi-devel-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/spi-devel-general
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Re: [PATCH 05/10] mmc: spi: Pull out the SSP clock configuration function
On Mon, 16 Jul 2012 14:09:52 +0200
Marek Vasut ma...@denx.de wrote:
Pull out the MMC clock configuration function and make it
into SSP clock configuration function, so it can be used by
the SPI driver too.
diff --git a/drivers/clk/mxs/clk-ssp.c b/drivers/clk/mxs/clk-ssp.c
new file mode 100644
index 000..b3c1e16
--- /dev/null
+++ b/drivers/clk/mxs/clk-ssp.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2012 DENX Software Engineering, GmbH
+ *
+ * Pulled from code:
+ * Portions copyright (C) 2003 Russell King, PXA MMCI Driver
+ * Portions copyright (C) 2004-2005 Pierre Ossman, W83L51xD SD/MMC driver
+ *
+ * Copyright 2008 Embedded Alley Solutions, Inc.
+ * Copyright 2009-2011 Freescale Semiconductor, Inc.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include linux/kernel.h
+#include linux/init.h
+#include linux/clk.h
+#include linux/module.h
+#include linux/device.h
+#include linux/io.h
+#include linux/spi/mxs-spi.h
+
+void mxs_ssp_set_clk_rate(struct mxs_ssp *ssp, unsigned int rate)
+{
+ unsigned int ssp_clk, ssp_sck;
+ u32 clock_divide, clock_rate;
+ u32 val;
+
+ ssp_clk = clk_get_rate(ssp-clk);
+
+ for (clock_divide = 2; clock_divide = 254; clock_divide += 2) {
+ clock_rate = DIV_ROUND_UP(ssp_clk, rate * clock_divide);
+ clock_rate = (clock_rate 0) ? clock_rate - 1 : 0;
+ if (clock_rate = 255)
+ break;
+ }
+
+ if (clock_divide 254) {
+ dev_err(ssp-dev,
+ %s: cannot set clock to %d\n, __func__, rate);
+ return;
+ }
+
+ ssp_sck = ssp_clk / clock_divide / (1 + clock_rate);
+
+ val = readl(ssp-base + HW_SSP_TIMING(ssp));
+ val = ~(BM_SSP_TIMING_CLOCK_DIVIDE | BM_SSP_TIMING_CLOCK_RATE);
+ val |= BF_SSP(clock_divide, TIMING_CLOCK_DIVIDE);
+ val |= BF_SSP(clock_rate, TIMING_CLOCK_RATE);
+ writel(val, ssp-base + HW_SSP_TIMING(ssp));
+
+ ssp-clk_rate = ssp_sck;
+
+ dev_dbg(ssp-dev,
+ %s: clock_divide %d, clock_rate %d, ssp_clk %d, rate_actual
%d, rate_requested %d\n,
+ __func__, clock_divide, clock_rate, ssp_clk, ssp_sck, rate);
+}
There is a EXPORT_SYMBOL_GPL(mxs_ssp_set_clk_rate); missing here.
Attila Kinali
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Re: [PATCH 00/10] MXS SPI driver
On Mon, Jul 16, 2012 at 02:09:47PM +0200, Marek Vasut wrote: This patchset adds SPI master support for Freescale i.MX233/i.MX28. This is rebased on top of next-20120713. Please consider applying, bugs shall now be squashed during the previous two review rounds. Always CC maintainers, and in this case me as well (I'm collecting SPI patches for this release since Grant's mostly offline). -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ spi-devel-general mailing list spi-devel-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/spi-devel-general
Re: [PATCH 05/10] mmc: spi: Pull out the SSP clock configuration function
Dear Attila Kinali,
On Mon, 16 Jul 2012 14:09:52 +0200
Marek Vasut ma...@denx.de wrote:
Pull out the MMC clock configuration function and make it
into SSP clock configuration function, so it can be used by
the SPI driver too.
diff --git a/drivers/clk/mxs/clk-ssp.c b/drivers/clk/mxs/clk-ssp.c
new file mode 100644
index 000..b3c1e16
--- /dev/null
+++ b/drivers/clk/mxs/clk-ssp.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2012 DENX Software Engineering, GmbH
+ *
+ * Pulled from code:
+ * Portions copyright (C) 2003 Russell King, PXA MMCI Driver
+ * Portions copyright (C) 2004-2005 Pierre Ossman, W83L51xD SD/MMC
driver + *
+ * Copyright 2008 Embedded Alley Solutions, Inc.
+ * Copyright 2009-2011 Freescale Semiconductor, Inc.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include linux/kernel.h
+#include linux/init.h
+#include linux/clk.h
+#include linux/module.h
+#include linux/device.h
+#include linux/io.h
+#include linux/spi/mxs-spi.h
+
+void mxs_ssp_set_clk_rate(struct mxs_ssp *ssp, unsigned int rate)
+{
+ unsigned int ssp_clk, ssp_sck;
+ u32 clock_divide, clock_rate;
+ u32 val;
+
+ ssp_clk = clk_get_rate(ssp-clk);
+
+ for (clock_divide = 2; clock_divide = 254; clock_divide += 2) {
+ clock_rate = DIV_ROUND_UP(ssp_clk, rate * clock_divide);
+ clock_rate = (clock_rate 0) ? clock_rate - 1 : 0;
+ if (clock_rate = 255)
+ break;
+ }
+
+ if (clock_divide 254) {
+ dev_err(ssp-dev,
+ %s: cannot set clock to %d\n, __func__, rate);
+ return;
+ }
+
+ ssp_sck = ssp_clk / clock_divide / (1 + clock_rate);
+
+ val = readl(ssp-base + HW_SSP_TIMING(ssp));
+ val = ~(BM_SSP_TIMING_CLOCK_DIVIDE | BM_SSP_TIMING_CLOCK_RATE);
+ val |= BF_SSP(clock_divide, TIMING_CLOCK_DIVIDE);
+ val |= BF_SSP(clock_rate, TIMING_CLOCK_RATE);
+ writel(val, ssp-base + HW_SSP_TIMING(ssp));
+
+ ssp-clk_rate = ssp_sck;
+
+ dev_dbg(ssp-dev,
+ %s: clock_divide %d, clock_rate %d, ssp_clk %d, rate_actual %d,
rate_requested %d\n, + __func__, clock_divide, clock_rate,
ssp_clk,
ssp_sck, rate);
+}
There is a EXPORT_SYMBOL_GPL(mxs_ssp_set_clk_rate); missing here.
What for?
Best regards,
Marek Vasut
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Re: [PATCH 00/10] MXS SPI driver
Dear Mark Brown, On Mon, Jul 16, 2012 at 02:09:47PM +0200, Marek Vasut wrote: This patchset adds SPI master support for Freescale i.MX233/i.MX28. This is rebased on top of next-20120713. Please consider applying, bugs shall now be squashed during the previous two review rounds. Always CC maintainers, and in this case me as well (I'm collecting SPI patches for this release since Grant's mostly offline). Ah, I wasn't aware you're the SPI maintainer now. Sorry about that. Will do if there's a rework requested. Best regards, Marek Vasut -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ spi-devel-general mailing list spi-devel-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/spi-devel-general
Re: [PATCH] spi/mpc8xxx:Fix the wrong pointer of getting the platform data
Hi All,
I'm sorry, please ignore this patch.
--
Best Regards,
Jiucheng
On Tue, 2012-06-26 at 10:32 +0800, Xu Jiucheng wrote:
In the spi_alloc_device(), the parent pointer of spi deivce has
been changed from master-dev.parent to master-dev for device
unregistration, so the pointer of getting the platform data as
this 'spi-dev.parent-platform_data' is wrong.
Signed-off-by: Xu Jiucheng b37...@freescale.com
---
drivers/spi/spi_fsl_spi.c |5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi_fsl_spi.c b/drivers/spi/spi_fsl_spi.c
index 7963c9b..7d164d3 100644
--- a/drivers/spi/spi_fsl_spi.c
+++ b/drivers/spi/spi_fsl_spi.c
@@ -139,7 +139,7 @@ static void fsl_spi_change_mode(struct spi_device *spi)
static void fsl_spi_chipselect(struct spi_device *spi, int value)
{
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi-master);
- struct fsl_spi_platform_data *pdata = spi-dev.parent-platform_data;
+ struct fsl_spi_platform_data *pdata = mpc8xxx_spi-dev-platform_data;
bool pol = spi-mode SPI_CS_HIGH;
struct spi_mpc8xxx_cs *cs = spi-controller_state;
@@ -934,7 +934,8 @@ err:
static void fsl_spi_cs_control(struct spi_device *spi, bool on)
{
- struct device *dev = spi-dev.parent;
+ struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi-master);
+ struct device *dev = mpc8xxx_spi-dev;
struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(dev-platform_data);
u16 cs = spi-chip_select;
int gpio = pinfo-gpios[cs];
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Re: [PATCH] spi/mpc8xxx:Fix the wrong pointer of getting the platform data
Hi all,
I'm sorry, this patch is invalid, please ignore it, I will resend a new
patch base on the last tree. Thanks.
--
Best Regards,
Jiucheng
On Tue, 2012-06-26 at 10:32 +0800, Xu Jiucheng wrote:
In the spi_alloc_device(), the parent pointer of spi deivce has
been changed from master-dev.parent to master-dev for device
unregistration, so the pointer of getting the platform data as
this 'spi-dev.parent-platform_data' is wrong.
Signed-off-by: Xu Jiucheng b37...@freescale.com
---
drivers/spi/spi_fsl_spi.c |5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi_fsl_spi.c b/drivers/spi/spi_fsl_spi.c
index 7963c9b..7d164d3 100644
--- a/drivers/spi/spi_fsl_spi.c
+++ b/drivers/spi/spi_fsl_spi.c
@@ -139,7 +139,7 @@ static void fsl_spi_change_mode(struct spi_device *spi)
static void fsl_spi_chipselect(struct spi_device *spi, int value)
{
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi-master);
- struct fsl_spi_platform_data *pdata = spi-dev.parent-platform_data;
+ struct fsl_spi_platform_data *pdata = mpc8xxx_spi-dev-platform_data;
bool pol = spi-mode SPI_CS_HIGH;
struct spi_mpc8xxx_cs *cs = spi-controller_state;
@@ -934,7 +934,8 @@ err:
static void fsl_spi_cs_control(struct spi_device *spi, bool on)
{
- struct device *dev = spi-dev.parent;
+ struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi-master);
+ struct device *dev = mpc8xxx_spi-dev;
struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(dev-platform_data);
u16 cs = spi-chip_select;
int gpio = pinfo-gpios[cs];
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