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OMAP2/3: hwmod: fix the i2c-reset timeout during bootup

PATCH Superseded Avinash.H.M 2 participants 5 messages May 20, 2011 – Jun 20, 2011

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v4 of 5 Superseded Latest is v5 →

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PATCH v4 1/1 OMAP2/3: hwmod: fix the i2c-reset timeout during bootup

The sequence of _ocp_softreset doesn't work for i2c. The i2c module has a special sequence to reset the module. The sequence is
- Disable the I2C.
- Write to SOFTRESET bit.
- Enable the I2C.
- Poll on the RESETDONE bit.
The sequence is implemented as a function and the i2c_class is updated with the correct 'reset' pointer. omap_hwmod_softreset function is implemented which triggers the softreset by writing into sysconfig register. On following this sequence, i2c module resets properly and timeouts are not seen.

Cc Rajendra Nayak <[email protected]>
Cc Paul Walmsley <[email protected]>
Cc Benoit Cousson <[email protected]>
Cc Kevin Hilman <[email protected]>

---

The patch is based on
* git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
* master branch.
* 693d92a commit. (Linux 2.6.39-rc7)

Changes from previous versions:
from v1:
- moved i2c specific things from hwmod files to i2c files.
- fixed comments from Paul.
- http://www.spinics.net/lists/linux-omap/msg49483.html

from v2:
- Avoided direct SYSCONFIG access in i2c.c
- http://www.spinics.net/lists/linux-omap/msg49632.html

from v3:
- Addressed comments from Paul Walmsley.
- http://www.spinics.net/lists/arm-kernel/msg124120.html

Testing:
* build tested omap2plus_defconfig for warnings and errors. none introduced.
* boot tested on 2430.
* tested for 'core off' in suspend resume on 3430 sdp. core off counters increment after suspend resume.

Dependency:
* This needs "OMAP2+: hwmod data: Set hwmod flags to only allow 16-bit accesses to i2c" from Andry Green for accessing i2c_sysc. Without this even with this patch, we will see i2c reset timeouts.

 arch/arm/mach-omap2/i2c.c                    |   54 ++++++++++++++++++++++++++
 arch/arm/mach-omap2/omap_hwmod.c             |   27 +++++++++++++
 arch/arm/mach-omap2/omap_hwmod_2420_data.c   |    1 +
 arch/arm/mach-omap2/omap_hwmod_2430_data.c   |    1 +
 arch/arm/mach-omap2/omap_hwmod_3xxx_data.c   |    1 +
 arch/arm/plat-omap/include/plat/i2c.h        |    4 ++
 arch/arm/plat-omap/include/plat/omap_hwmod.h |    1 +
 7 files changed, 89 insertions(+), 0 deletions(-)
arch/arm/mach-omap2/i2c.c +54 -0
index 79c478c..de9c51a 100644
@@ -21,9 +21,16 @@
 
 #include <plat/cpu.h>
 #include <plat/i2c.h>
+#include <plat/common.h>
 
 #include "mux.h"
 
+/* In register I2C_CON, Bit 15 is the I2C enable bit */
+#define I2C_EN				BIT(15)
+#define I2C_CON_OFFSET			0x24
+/* Maximum microseconds to wait for OMAP module to softreset */
+#define MAX_MODULE_SOFTRESET_WAIT	10000
+
 void __init omap2_i2c_mux_pins(int bus_id)
 {
 	char mux_name[sizeof("i2c2_scl.i2c2_scl")];
@@ -37,3 +44,50 @@ void __init omap2_i2c_mux_pins(int bus_id)
 	sprintf(mux_name, "i2c%i_sda.i2c%i_sda", bus_id, bus_id);
 	omap_mux_init_signal(mux_name, OMAP_PIN_INPUT);
 }
+
+/**
+ * omap_i2c_reset - reset the omap i2c module.
+ * @oh: struct omap_hwmod *
+ *
+ * The i2c moudle in omap2, omap3 had a special sequence to reset. The
+ * sequence is:
+ * - Disable the I2C.
+ * - Write to SOFTRESET bit.
+ * - Enable the I2C.
+ * - Poll on the RESETDONE bit.
+ * The sequence is implemented in below function. This is called for 2420,
+ * 2430 and omap3.
+ */
+int omap_i2c_reset(struct omap_hwmod *oh)
+{
+	u32 v;
+	int c = 0;
+
+	/* Disable I2C */
+	v = omap_hwmod_read(oh, I2C_CON_OFFSET);
+	v = v & ~I2C_EN;
+	omap_hwmod_write(v, oh, I2C_CON_OFFSET);
+
+	/* Write to the SOFTRESET bit */
+	omap_hwmod_softreset(oh);
+
+	/* Enable I2C */
+	v = omap_hwmod_read(oh, I2C_CON_OFFSET);
+	v |= I2C_EN;
+	omap_hwmod_write(v, oh, I2C_CON_OFFSET);
+
+	/* Poll on RESETDONE bit */
+	omap_test_timeout((omap_hwmod_read(oh,
+				oh->class->sysc->syss_offs)
+				& SYSS_RESETDONE_MASK),
+				MAX_MODULE_SOFTRESET_WAIT, c);
+
+	if (c == MAX_MODULE_SOFTRESET_WAIT)
+		pr_warning("%s: %s: softreset failed (waited %d usec)\n",
+			__func__, oh->name, MAX_MODULE_SOFTRESET_WAIT);
+	else
+		pr_debug("%s: %s: softreset in %d usec\n", __func__,
+			oh->name, c);
+
+	return 0;
+}
arch/arm/mach-omap2/omap_hwmod.c +27 -0
index e034294..08c803c 100644
@@ -1562,6 +1562,33 @@ void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
 }
 
 /**
+ * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
+ * @oh: struct omap_hwmod *
+ *
+ * This is a public function exposed to drivers. Some drivers may need to do
+ * some settings before and after resetting the device.  Those drivers after
+ * doing the necessary settings could use this function to start a reset by
+ * setting the SYSCONFIG.SOFTRESET bit.
+ */
+int omap_hwmod_softreset(struct omap_hwmod *oh)
+{
+	u32 v;
+	int ret;
+
+	if(!oh || !(oh->_sysc_cache))
+		return -EINVAL;
+
+	v = oh->_sysc_cache;
+	ret = _set_softreset(oh, &v);
+	if (ret)
+		goto error;
+	_write_sysconfig(v, oh);
+
+error:
+	return ret;
+}
+
+/**
  * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
  * @oh: struct omap_hwmod *
  * @idlemode: SIDLEMODE field bits (shifted to bit 0)
arch/arm/mach-omap2/omap_hwmod_2420_data.c +1 -0
index c4d0ae8..8950ad3 100644
@@ -1447,6 +1447,7 @@ static struct omap_hwmod_class_sysconfig i2c_sysc = {
 static struct omap_hwmod_class i2c_class = {
 	.name		= "i2c",
 	.sysc		= &i2c_sysc,
+	.reset		= &omap_i2c_reset,
 };
 
 static struct omap_i2c_dev_attr i2c_dev_attr;
arch/arm/mach-omap2/omap_hwmod_2430_data.c +1 -0
index 9682dd5..6b5413b 100644
@@ -1524,6 +1524,7 @@ static struct omap_hwmod_class_sysconfig i2c_sysc = {
 static struct omap_hwmod_class i2c_class = {
 	.name		= "i2c",
 	.sysc		= &i2c_sysc,
+	.reset		= &omap_i2c_reset,
 };
 
 static struct omap_i2c_dev_attr i2c_dev_attr = {
arch/arm/mach-omap2/omap_hwmod_3xxx_data.c +1 -0
index 909a84d..2e21e2d 100644
@@ -1460,6 +1460,7 @@ static struct omap_hwmod omap3xxx_uart4_hwmod = {
 static struct omap_hwmod_class i2c_class = {
 	.name = "i2c",
 	.sysc = &i2c_sysc,
+	.reset = &omap_i2c_reset,
 };
 
 /*
arch/arm/plat-omap/include/plat/i2c.h +4 -0
index 878d632..3ffb94e 100644
@@ -23,6 +23,8 @@
 
 #include <linux/i2c.h>
 
+#include <plat/omap_hwmod.h>
+
 #if defined(CONFIG_I2C_OMAP) || defined(CONFIG_I2C_OMAP_MODULE)
 extern int omap_register_i2c_bus(int bus_id, u32 clkrate,
 				 struct i2c_board_info const *info,
@@ -52,4 +54,6 @@ struct omap_i2c_dev_attr {
 void __init omap1_i2c_mux_pins(int bus_id);
 void __init omap2_i2c_mux_pins(int bus_id);
 
+int omap_i2c_reset(struct omap_hwmod *oh);
+
 #endif /* __ASM__ARCH_OMAP_I2C_H */
arch/arm/plat-omap/include/plat/omap_hwmod.h +1 -0
index 1adea9c..fe8a0a2 100644
@@ -572,6 +572,7 @@ void omap_hwmod_ocp_barrier(struct omap_hwmod *oh);
 
 void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs);
 u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs);
+int omap_hwmod_softreset(struct omap_hwmod *oh);
 
 int omap_hwmod_count_resources(struct omap_hwmod *oh);
 int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res);
Signature · 1 line
1.7.1
#1 lore raw

PATCH v4 1/1 OMAP2/3: hwmod: fix the i2c-reset timeout during bootup

Quoted 17 lines · Avinash.H.M

The sequence of _ocp_softreset doesn't work for i2c. The i2c module has a special sequence to reset the module. The sequence is
- Disable the I2C.
- Write to SOFTRESET bit.
- Enable the I2C.
- Poll on the RESETDONE bit.
The sequence is implemented as a function and the i2c_class is updated with the correct 'reset' pointer. omap_hwmod_softreset function is implemented which triggers the softreset by writing into sysconfig register. On following this sequence, i2c module resets properly and timeouts are not seen.

Cc Rajendra Nayak <[email protected]>
Cc Paul Walmsley <[email protected]>
Cc Benoit Cousson <[email protected]>
Cc Kevin Hilman <[email protected]>

---

<snip>

Quoted 14 lines
arch/arm/plat-omap/include/plat/i2c.h +2 -0
index 878d632..3ffb94e 100644
@@ -23,6 +23,8 @@
 
 #include <linux/i2c.h>
 
+#include <plat/omap_hwmod.h>
+
 #if defined(CONFIG_I2C_OMAP) || defined(CONFIG_I2C_OMAP_MODULE)
 extern int omap_register_i2c_bus(int bus_id, u32 clkrate,
 				 struct i2c_board_info const *info,

arch/arm/plat-omap/include/plat/i2c.h struct omap_i2c_dev_attr { · line 58

Quoted 5 lines
arch/arm/plat-omap/include/plat/i2c.h +2 -0
@@ -52,4 +54,6 @@ struct omap_i2c_dev_attr {
 void __init omap1_i2c_mux_pins(int bus_id);
 void __init omap2_i2c_mux_pins(int bus_id);
 
+int omap_i2c_reset(struct omap_hwmod *oh);
+

It's not necessary to include omap_hwmod.h, just declare

struct omap_hwmod;

Tomi

#2 lore raw

PATCH v4 1/1 OMAP2/3: hwmod: fix the i2c-reset timeout during bootup

Quoted 38 lines · Tomi Valkeinen
Quoted 17 lines · Avinash.H.M

The sequence of _ocp_softreset doesn't work for i2c. The i2c module has a special sequence to reset the module. The sequence is
- Disable the I2C.
- Write to SOFTRESET bit.
- Enable the I2C.
- Poll on the RESETDONE bit.
The sequence is implemented as a function and the i2c_class is updated with the correct 'reset' pointer. omap_hwmod_softreset function is implemented which triggers the softreset by writing into sysconfig register. On following this sequence, i2c module resets properly and timeouts are not seen.

Cc Rajendra Nayak <[email protected]>
Cc Paul Walmsley <[email protected]>
Cc Benoit Cousson <[email protected]>
Cc Kevin Hilman <[email protected]>

---

<snip>

Quoted 17 lines
arch/arm/plat-omap/include/plat/i2c.h +2 -0
index 878d632..3ffb94e 100644
@@ -23,6 +23,8 @@
 
 #include <linux/i2c.h>
 
+#include <plat/omap_hwmod.h>
+
 #if defined(CONFIG_I2C_OMAP) || defined(CONFIG_I2C_OMAP_MODULE)
 extern int omap_register_i2c_bus(int bus_id, u32 clkrate,
 				 struct i2c_board_info const *info,
@@ -52,4 +54,6 @@ struct omap_i2c_dev_attr {
 void __init omap1_i2c_mux_pins(int bus_id);
 void __init omap2_i2c_mux_pins(int bus_id);
 
Quoted 6 lines

arch/arm/plat-omap/include/plat/i2c.h struct omap_i2c_dev_attr { · line 58

Quoted 2 lines
arch/arm/plat-omap/include/plat/i2c.h +2 -0
+int omap_i2c_reset(struct omap_hwmod *oh);
+

It's not necessary to include omap_hwmod.h, just declare

struct omap_hwmod;

Hi Tomi ,

I agree to the comment, since it is a header file (i2c.h), no need to include hwmod.h.

I ll drop the file inclusion. Thanks for reviewing.

B R ,

- Avinash

Quoted 4 lines

Tomi

#3 lore raw

PATCH v4 1/1 OMAP2/3: hwmod: fix the i2c-reset timeout during bootup

In reply to Avinash.H.M
Quoted 11 lines · Avinash.H.M

The sequence of _ocp_softreset doesn't work for i2c. The i2c module has a special sequence to reset the module. The sequence is
- Disable the I2C.
- Write to SOFTRESET bit.
- Enable the I2C.
- Poll on the RESETDONE bit.
The sequence is implemented as a function and the i2c_class is updated with the correct 'reset' pointer. omap_hwmod_softreset function is implemented which triggers the softreset by writing into sysconfig register. On following this sequence, i2c module resets properly and timeouts are not seen.

Quoted 6 lines
Cc Rajendra Nayak <[email protected]>
Cc Paul Walmsley <[email protected]>
Cc Benoit Cousson <[email protected]>
Cc Kevin Hilman <[email protected]>

---

Hi Kevin, Paul ,

Ping .. could you please review this.

thanks ,

- Avinash

#4 lore raw

PATCH v4 1/1 OMAP2/3: hwmod: fix the i2c-reset timeout during bootup

Quoted 19 lines · Avinash.H.M.
Quoted 11 lines · Avinash.H.M

The sequence of _ocp_softreset doesn't work for i2c. The i2c module has a special sequence to reset the module. The sequence is
- Disable the I2C.
- Write to SOFTRESET bit.
- Enable the I2C.
- Poll on the RESETDONE bit.
The sequence is implemented as a function and the i2c_class is updated with the correct 'reset' pointer. omap_hwmod_softreset function is implemented which triggers the softreset by writing into sysconfig register. On following this sequence, i2c module resets properly and timeouts are not seen.

Quoted 6 lines
Cc Rajendra Nayak <[email protected]>
Cc Paul Walmsley <[email protected]>
Cc Benoit Cousson <[email protected]>
Cc Kevin Hilman <[email protected]>

---

Quoted 3 lines

Hi Kevin, Paul ,

Ping .. could you please review this.

Hi Paul ,

I recently observed that the sequence we are following to reset i2c in omap2, 3 is also applicable for omap4. On checking the the omap4 TRM sequence , i confirmed this.

The reason why there were no timeouts seen in omap4 was, because of the 'HWMOD_INIT_NO_RESET' flag in the omap4 i2c hwmods. Because of these flags, hwmod wasn't really attempting to reset i2c in omap4 and hence no timeouts were seen.

I ll extend the patch to omap4 and send out new patch, also fixing comments from Tomi. I ll send out v5 and you can review directly v5.

thanks ,

- Avinash

Quoted 5 lines

thanks ,

- Avinash