[U-Boot] mpc83xx: update LCRR register handling

[U-Boot] mpc83xx: update LCRR register handling

[Heiko Schocher]

MPC8379E RM says (10-34):
Once LCRR[CLKDIV] is written, the register should be read, and then
an isync should be executed.
So update this in code.
Also define a LCRR mask for processors, which uses not all bits
in the LCRR register (as for example mpc832x did).

Signed-off-by: Heiko Schocher <hs@denx.de>
---
 cpu/mpc83xx/cpu_init.c |   11 +++++++++--
 include/mpc83xx.h      |    5 +++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/cpu/mpc83xx/cpu_init.c b/cpu/mpc83xx/cpu_init.c
index ea4f2af..b733fce 100644
--- a/cpu/mpc83xx/cpu_init.c
+++ b/cpu/mpc83xx/cpu_init.c
@@ -23,8 +23,8 @@
 #include <common.h>
 #include <mpc83xx.h>
 #include <ioports.h>
-#ifdef CONFIG_USB_EHCI_FSL
 #include <asm/io.h>
+#ifdef CONFIG_USB_EHCI_FSL
 #include <usb/ehci-fsl.h>
 #endif

@@ -194,7 +194,14 @@ void cpu_init_f (volatile immap_t * im)
 	im->reset.rmr = (RMR_CSRE & (1<<RMR_CSRE_SHIFT));

 	/* LCRR - Clock Ratio Register (10.3.1.16) */
-	im->lbus.lcrr = CONFIG_SYS_LCRR;
+	out_be32(&im->lbus.lcrr, ((in_be32(&im->lbus.lcrr) & ~LCRR_MASK) | \
+			(CONFIG_SYS_LCRR & LCRR_MASK)));
+	/* MPC8379E RM 10-34 says after writting this register
+	 * the register should be reread and an isync should be
+	 * executed.
+	 */
+	in_be32(&im->lbus.lcrr);
+	isync();

 	/* Enable Time Base & Decrimenter ( so we will have udelay() )*/
 	im->sysconf.spcr |= SPCR_TBEN;
diff --git a/include/mpc83xx.h b/include/mpc83xx.h
index 44115c9..41bb845 100644
--- a/include/mpc83xx.h
+++ b/include/mpc83xx.h
@@ -198,6 +198,7 @@
 #define SICRL_URT_CTPR			0x06000000
 #define SICRL_IRQ_CTPR			0x00C00000

+#define LCRR_MASK			0x0003000f
 #elif defined(CONFIG_MPC8313)
 /* SICRL bits - MPC8313 specific */
 #define SICRL_LBC			0x30000000
@@ -1200,6 +1201,10 @@

 #define PEX_GCLK_RATIO		0x440

+#if !defined(LCRR_MASK)
+#define LCRR_MASK		0xFFFFFFFF
+#endif
+
 #ifndef __ASSEMBLY__
 struct pci_region;
 void mpc83xx_pci_init(int num_buses, struct pci_region **reg, int warmboot);
-- 
1.6.0.6

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

[U-Boot] mpc83xx: update LCRR register handling

[Liu Dave-R63238]

> MPC8379E RM says (10-34):
> Once LCRR[CLKDIV] is written, the register should be read, and then
> an isync should be executed.
> So update this in code.
> Also define a LCRR mask for processors, which uses not all bits
> in the LCRR register (as for example mpc832x did).
> 
> Signed-off-by: Heiko Schocher <hs@denx.de>
> ---
>  cpu/mpc83xx/cpu_init.c |   11 +++++++++--
>  include/mpc83xx.h      |    5 +++++
>  2 files changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/cpu/mpc83xx/cpu_init.c b/cpu/mpc83xx/cpu_init.c
> index ea4f2af..b733fce 100644
> --- a/cpu/mpc83xx/cpu_init.c
> +++ b/cpu/mpc83xx/cpu_init.c
> @@ -23,8 +23,8 @@
>  #include <common.h>
>  #include <mpc83xx.h>
>  #include <ioports.h>
> -#ifdef CONFIG_USB_EHCI_FSL
>  #include <asm/io.h>
> +#ifdef CONFIG_USB_EHCI_FSL
>  #include <usb/ehci-fsl.h>
>  #endif
> 
> @@ -194,7 +194,14 @@ void cpu_init_f (volatile immap_t * im)
>  	im->reset.rmr = (RMR_CSRE & (1<<RMR_CSRE_SHIFT));
> 
>  	/* LCRR - Clock Ratio Register (10.3.1.16) */
> -	im->lbus.lcrr = CONFIG_SYS_LCRR;
> +	out_be32(&im->lbus.lcrr, ((in_be32(&im->lbus.lcrr) & 
> ~LCRR_MASK) | \
> +			(CONFIG_SYS_LCRR & LCRR_MASK)));
> +	/* MPC8379E RM 10-34 says after writting this register
> +	 * the register should be reread and an isync should be
> +	 * executed.
> +	 */
> +	in_be32(&im->lbus.lcrr);
> +	isync();

Hi Heiko,

It would be great if you guy can move this code to cpu_init_r.

If we change the local bus clock freq while the code is running
from the local bus, it is not safe.

Thanks, Dave

[U-Boot] [PATCH v2] mpc83xx: update LCRR register handling

[Heiko Schocher]

MPC8379E RM says (10-34):
Once LCRR[CLKDIV] is written, the register should be read, and then
an isync should be executed.
So update this in code.
Also define a LCRR mask for processors, which uses not all bits
in the LCRR register (as for example mpc832x did).

Signed-off-by: Heiko Schocher <hs@denx.de>
---

- added comment from DaveLiu. moved LCRR setting to
  cpu_init_r()

 cpu/mpc83xx/cpu_init.c |   19 +++++++++++++++----
 include/mpc83xx.h      |    5 +++++
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/cpu/mpc83xx/cpu_init.c b/cpu/mpc83xx/cpu_init.c
index ea4f2af..3ca57aa 100644
--- a/cpu/mpc83xx/cpu_init.c
+++ b/cpu/mpc83xx/cpu_init.c
@@ -23,8 +23,8 @@
 #include <common.h>
 #include <mpc83xx.h>
 #include <ioports.h>
-#ifdef CONFIG_USB_EHCI_FSL
 #include <asm/io.h>
+#ifdef CONFIG_USB_EHCI_FSL
 #include <usb/ehci-fsl.h>
 #endif

@@ -193,9 +193,6 @@ void cpu_init_f (volatile immap_t * im)
 	 */
 	im->reset.rmr = (RMR_CSRE & (1<<RMR_CSRE_SHIFT));

-	/* LCRR - Clock Ratio Register (10.3.1.16) */
-	im->lbus.lcrr = CONFIG_SYS_LCRR;
-
 	/* Enable Time Base & Decrimenter ( so we will have udelay() )*/
 	im->sysconf.spcr |= SPCR_TBEN;

@@ -329,8 +326,22 @@ void cpu_init_f (volatile immap_t * im)

 int cpu_init_r (void)
 {
+	volatile immap_t *im = (volatile immap_t *)CONFIG_SYS_IMMR;
 #ifdef CONFIG_QE
 	uint qe_base = CONFIG_SYS_IMMR + 0x00100000; /* QE immr base */
+#endif
+
+	/* LCRR - Clock Ratio Register (10.3.1.16) */
+	out_be32(&im->lbus.lcrr, ((in_be32(&im->lbus.lcrr) & ~LCRR_MASK) | \
+			(CONFIG_SYS_LCRR & LCRR_MASK)));
+	/* MPC8379E RM 10-34 says after writting this register
+	 * the register should be reread and an isync should be
+	 * executed.
+	 */
+	in_be32(&im->lbus.lcrr);
+	isync();
+
+#ifdef CONFIG_QE
 	qe_init(qe_base);
 	qe_reset();
 #endif
diff --git a/include/mpc83xx.h b/include/mpc83xx.h
index 44115c9..41bb845 100644
--- a/include/mpc83xx.h
+++ b/include/mpc83xx.h
@@ -198,6 +198,7 @@
 #define SICRL_URT_CTPR			0x06000000
 #define SICRL_IRQ_CTPR			0x00C00000

+#define LCRR_MASK			0x0003000f
 #elif defined(CONFIG_MPC8313)
 /* SICRL bits - MPC8313 specific */
 #define SICRL_LBC			0x30000000
@@ -1200,6 +1201,10 @@

 #define PEX_GCLK_RATIO		0x440

+#if !defined(LCRR_MASK)
+#define LCRR_MASK		0xFFFFFFFF
+#endif
+
 #ifndef __ASSEMBLY__
 struct pci_region;
 void mpc83xx_pci_init(int num_buses, struct pci_region **reg, int warmboot);
-- 
1.6.0.6

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

[U-Boot] [PATCH v2] mpc83xx: update LCRR register handling

[Liu Dave-R63238]

> -----Original Message-----
> From: Heiko Schocher [mailto:hs at denx.de] 
> Sent: Tuesday, August 25, 2009 7:32 PM
> To: Liu Dave-R63238
> Cc: Phillips Kim-R1AAHA; U-Boot user list
> Subject: [PATCH v2] mpc83xx: update LCRR register handling
> 
> MPC8379E RM says (10-34):
> Once LCRR[CLKDIV] is written, the register should be read, and then
> an isync should be executed.
> So update this in code.
> Also define a LCRR mask for processors, which uses not all bits
> in the LCRR register (as for example mpc832x did).
> 
> Signed-off-by: Heiko Schocher <hs@denx.de>

Acked-by: Dave Liu <daveliu@freescale.com>

[U-Boot] [PATCH v2] mpc83xx: update LCRR register handling

[Kim Phillips]

On Tue, 25 Aug 2009 13:31:34 +0200
Heiko Schocher <hs@denx.de> wrote:

> MPC8379E RM says (10-34):
> Once LCRR[CLKDIV] is written, the register should be read, and then
> an isync should be executed.
> So update this in code.
> Also define a LCRR mask for processors, which uses not all bits
> in the LCRR register (as for example mpc832x did).
> 
> Signed-off-by: Heiko Schocher <hs@denx.de>
> ---

thanks for this Heiko...some comments:

>  int cpu_init_r (void)
>  {
> +	volatile immap_t *im = (volatile immap_t *)CONFIG_SYS_IMMR;
>  #ifdef CONFIG_QE
>  	uint qe_base = CONFIG_SYS_IMMR + 0x00100000; /* QE immr base */
> +#endif
> +
> +	/* LCRR - Clock Ratio Register (10.3.1.16) */
> +	out_be32(&im->lbus.lcrr, ((in_be32(&im->lbus.lcrr) & ~LCRR_MASK) | \
> +			(CONFIG_SYS_LCRR & LCRR_MASK)));

..

> +	/* MPC8379E RM 10-34 says after writting this register
> +	 * the register should be reread and an isync should be
> +	 * executed.
> +	 */
> +	in_be32(&im->lbus.lcrr);
> +	isync();

in_be32 and friends does the isync for you.  In fact, you can probably
do it in one fell swoop by using setbits/clrsetbits?

> +++ b/include/mpc83xx.h
> @@ -198,6 +198,7 @@
>  #define SICRL_URT_CTPR			0x06000000
>  #define SICRL_IRQ_CTPR			0x00C00000
> 
> +#define LCRR_MASK			0x0003000f

I thought we discussed this - shouldn't this be 0x7fffffff?

Kim

[U-Boot] [PATCH v2] mpc83xx: update LCRR register handling

[Heiko Schocher]

Hello Kim,

Kim Phillips wrote:
> On Tue, 25 Aug 2009 13:31:34 +0200
> Heiko Schocher <hs@denx.de> wrote:
> 
>> MPC8379E RM says (10-34):
>> Once LCRR[CLKDIV] is written, the register should be read, and then
>> an isync should be executed.
>> So update this in code.
>> Also define a LCRR mask for processors, which uses not all bits
>> in the LCRR register (as for example mpc832x did).
>>
>> Signed-off-by: Heiko Schocher <hs@denx.de>
>> ---
> 
> thanks for this Heiko...some comments:
> 
>>  int cpu_init_r (void)
>>  {
>> +	volatile immap_t *im = (volatile immap_t *)CONFIG_SYS_IMMR;
>>  #ifdef CONFIG_QE
>>  	uint qe_base = CONFIG_SYS_IMMR + 0x00100000; /* QE immr base */
>> +#endif
>> +
>> +	/* LCRR - Clock Ratio Register (10.3.1.16) */
>> +	out_be32(&im->lbus.lcrr, ((in_be32(&im->lbus.lcrr) & ~LCRR_MASK) | \
>> +			(CONFIG_SYS_LCRR & LCRR_MASK)));
> 
> ..
> 
>> +	/* MPC8379E RM 10-34 says after writting this register
>> +	 * the register should be reread and an isync should be
>> +	 * executed.
>> +	 */
>> +	in_be32(&im->lbus.lcrr);
>> +	isync();
> 
> in_be32 and friends does the isync for you.  In fact, you can probably
> do it in one fell swoop by using setbits/clrsetbits?

Argh, of course. But I need the in_be32() for rereading the register
again, as the RM says.

>> +++ b/include/mpc83xx.h
>> @@ -198,6 +198,7 @@
>>  #define SICRL_URT_CTPR			0x06000000
>>  #define SICRL_IRQ_CTPR			0x00C00000
>>
>> +#define LCRR_MASK			0x0003000f
> 
> I thought we discussed this - shouldn't this be 0x7fffffff?

Hmm.. as I did this mpc832x specific, in my version it is not possible
to set reserved 0 bits to 1 ... Ah, I reread your mail again, you wrote:
> I guess I have a shoot-yourself-in-the-foot philosophy - you're free to
> find out what happens when setting reserved bits to 1 if you so wish.
> u-boot protects you up to the point where you veer off into using
> hardcoded values instead of using the predefined CONFIG_SYS_SCCR_*
> macros.

I think you mean the LCRR_* defines ...

Hmm... so we can say: "feel free to find out what happens, if setting
reserved 1 bits to 0! and can drop this patch" ...

Hmmm, you can use for the mpc832x for example the LCRR_BUFCMDC_1,
what is a valid define for mpc83xx, but it is not valid for the
mpc832x ... so It is not the problem, that a u-boot user use hard-
coded values, instead this processor don;t support all bits valid
for other mpc83xx processors.

So I tend to protect an u-boot user from doing wrong things,
(setting reserved 0/1 bits to 1/0) if it is easy possible ...

bye
Heiko
-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

[U-Boot] [PATCH v2] mpc83xx: update LCRR register handling

[Kim Phillips]

On Wed, 26 Aug 2009 08:28:37 +0200
Heiko Schocher <hs@denx.de> wrote:

> Hello Kim,
> 
> Kim Phillips wrote:
> > On Tue, 25 Aug 2009 13:31:34 +0200
> > Heiko Schocher <hs@denx.de> wrote:
> >> +	/* MPC8379E RM 10-34 says after writting this register
> >> +	 * the register should be reread and an isync should be
> >> +	 * executed.
> >> +	 */
> >> +	in_be32(&im->lbus.lcrr);
> >> +	isync();
> > 
> > in_be32 and friends does the isync for you.  In fact, you can probably
> > do it in one fell swoop by using setbits/clrsetbits?
> 
> Argh, of course. But I need the in_be32() for rereading the register
> again, as the RM says.

right on

> >> +++ b/include/mpc83xx.h
> >> @@ -198,6 +198,7 @@
> >>  #define SICRL_URT_CTPR			0x06000000
> >>  #define SICRL_IRQ_CTPR			0x00C00000
> >>
> >> +#define LCRR_MASK			0x0003000f
> > 
> > I thought we discussed this - shouldn't this be 0x7fffffff?
> 
> Hmm.. as I did this mpc832x specific, in my version it is not possible
> to set reserved 0 bits to 1 ... Ah, I reread your mail again, you wrote:
> > I guess I have a shoot-yourself-in-the-foot philosophy - you're free to
> > find out what happens when setting reserved bits to 1 if you so wish.
> > u-boot protects you up to the point where you veer off into using
> > hardcoded values instead of using the predefined CONFIG_SYS_SCCR_*
> > macros.
> 
> I think you mean the LCRR_* defines ...

yes, thank you

> Hmm... so we can say: "feel free to find out what happens, if setting
> reserved 1 bits to 0! and can drop this patch" ...

precisely - I'd rather have this kept in the board config file if at
all possible - that's how other 83xx boards do it atm.

> Hmmm, you can use for the mpc832x for example the LCRR_BUFCMDC_1,
> what is a valid define for mpc83xx, but it is not valid for the
> mpc832x ... so It is not the problem, that a u-boot user use hard-
> coded values, instead this processor don;t support all bits valid
> for other mpc83xx processors.
> 
> So I tend to protect an u-boot user from doing wrong things,
> (setting reserved 0/1 bits to 1/0) if it is easy possible ...

right but:

o LCRR_PDYP, granted dangerous in your case, is obviously a writeable
bit (not read-only), and documented as such in later documentation.  In
fact, there are no non-writeable bits in LCRR.

o the user loses visibility into what is going on if they
decide to drop/add sensitive bits such as LCRR_DBYP in their board's
CONFIG_SYS_LCRR settings, and there's a mask lurking in the background.

o let's be practical here - in a board port, LCRR settings have to be
paid attention to, no matter what hidden behaviours or new bits there
are lying underneath - perhaps the form of 'protection' you seek is in
the form of a comment in the code?

Kim

[U-Boot] [PATCH v3] mpc83xx: update LCRR register handling

[Heiko Schocher]

MPC8379E RM says (10-34):
Once LCRR[CLKDIV] is written, the register should be read, and then
an isync should be executed.
So update this in code.
Also define a LCRR mask for processors, which uses not all bits
in the LCRR register (as for example mpc832x did).

Signed-off-by: Heiko Schocher <hs@denx.de>
---
changes since v1:
- added comment from DaveLiu. moved LCRR setting to
  cpu_init_r()

changes since v2:
  - added comment from Kim Phillips
    changed LCRR_MASK to 0x7fffffff
    use clrsetbits()

 cpu/mpc83xx/cpu_init.c |   17 +++++++++++++----
 include/mpc83xx.h      |    5 +++++
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/cpu/mpc83xx/cpu_init.c b/cpu/mpc83xx/cpu_init.c
index ea4f2af..c51924f 100644
--- a/cpu/mpc83xx/cpu_init.c
+++ b/cpu/mpc83xx/cpu_init.c
@@ -23,8 +23,8 @@
 #include <common.h>
 #include <mpc83xx.h>
 #include <ioports.h>
-#ifdef CONFIG_USB_EHCI_FSL
 #include <asm/io.h>
+#ifdef CONFIG_USB_EHCI_FSL
 #include <usb/ehci-fsl.h>
 #endif

@@ -193,9 +193,6 @@ void cpu_init_f (volatile immap_t * im)
 	 */
 	im->reset.rmr = (RMR_CSRE & (1<<RMR_CSRE_SHIFT));

-	/* LCRR - Clock Ratio Register (10.3.1.16) */
-	im->lbus.lcrr = CONFIG_SYS_LCRR;
-
 	/* Enable Time Base & Decrimenter ( so we will have udelay() )*/
 	im->sysconf.spcr |= SPCR_TBEN;

@@ -329,8 +326,20 @@ void cpu_init_f (volatile immap_t * im)

 int cpu_init_r (void)
 {
+	volatile immap_t *im = (volatile immap_t *)CONFIG_SYS_IMMR;
 #ifdef CONFIG_QE
 	uint qe_base = CONFIG_SYS_IMMR + 0x00100000; /* QE immr base */
+#endif
+
+	/* LCRR - Clock Ratio Register (10.3.1.16) */
+	clrsetbits_be32(&im->lbus.lcrr, LCRR_MASK, CONFIG_SYS_LCRR);
+	/* MPC8379E RM 10-34 says after writting this register
+	 * the register should be reread and an isync should be
+	 * executed.
+	 */
+	in_be32(&im->lbus.lcrr);
+
+#ifdef CONFIG_QE
 	qe_init(qe_base);
 	qe_reset();
 #endif
diff --git a/include/mpc83xx.h b/include/mpc83xx.h
index 44115c9..15440b5 100644
--- a/include/mpc83xx.h
+++ b/include/mpc83xx.h
@@ -198,6 +198,7 @@
 #define SICRL_URT_CTPR			0x06000000
 #define SICRL_IRQ_CTPR			0x00C00000

+#define LCRR_MASK			0x7fffffff
 #elif defined(CONFIG_MPC8313)
 /* SICRL bits - MPC8313 specific */
 #define SICRL_LBC			0x30000000
@@ -1200,6 +1201,10 @@

 #define PEX_GCLK_RATIO		0x440

+#if !defined(LCRR_MASK)
+#define LCRR_MASK		0xFFFFFFFF
+#endif
+
 #ifndef __ASSEMBLY__
 struct pci_region;
 void mpc83xx_pci_init(int num_buses, struct pci_region **reg, int warmboot);
-- 
1.6.0.6

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

[U-Boot] [PATCH v3] mpc83xx: update LCRR register handling

[Jerry Van Baren]

Hi Heiko,

One minor critique, I had problems parsing the comment:

Heiko Schocher wrote:
> MPC8379E RM says (10-34):
> Once LCRR[CLKDIV] is written, the register should be read, and then
> an isync should be executed.
> So update this in code.
> Also define a LCRR mask for processors, which uses not all bits
                                           ^^^^^^^^^^^^^^^^^^^^^^^
Suggested change:
Also define a LCRR mask for processors to prevent setting any reserved 
bits in the LCRR register (as, for example, mpc832x did).

> in the LCRR register (as for example mpc832x did).
> 
> Signed-off-by: Heiko Schocher <hs@denx.de>

Thanks,
gvb

[U-Boot] [PATCH v3] mpc83xx: update LCRR register handling

[Kim Phillips]

On Thu, 27 Aug 2009 08:20:35 +0200
Heiko Schocher <hs@denx.de> wrote:

> MPC8379E RM says (10-34):
> Once LCRR[CLKDIV] is written, the register should be read, and then
> an isync should be executed.
> So update this in code.
> Also define a LCRR mask for processors, which uses not all bits
> in the LCRR register (as for example mpc832x did).
> 
> Signed-off-by: Heiko Schocher <hs@denx.de>
> ---
> changes since v1:
> - added comment from DaveLiu. moved LCRR setting to
>   cpu_init_r()
> 
> changes since v2:
>   - added comment from Kim Phillips
>     changed LCRR_MASK to 0x7fffffff
>     use clrsetbits()

Heiko - let's go with the SCCR approach of setting bits in the LCRR,
and have board config files only specify values for fields they're
modifying from the reset value for their processor (this can be
extended to 85xx-world).

Kim

[U-Boot] [PATCH v3] mpc83xx: update LCRR register handling

[Kumar Gala]

On Aug 27, 2009, at 3:53 PM, Kim Phillips wrote:

> On Thu, 27 Aug 2009 08:20:35 +0200
> Heiko Schocher <hs@denx.de> wrote:
>
>> MPC8379E RM says (10-34):
>> Once LCRR[CLKDIV] is written, the register should be read, and then
>> an isync should be executed.
>> So update this in code.
>> Also define a LCRR mask for processors, which uses not all bits
>> in the LCRR register (as for example mpc832x did).
>>
>> Signed-off-by: Heiko Schocher <hs@denx.de>
>> ---
>> changes since v1:
>> - added comment from DaveLiu. moved LCRR setting to
>>  cpu_init_r()
>>
>> changes since v2:
>>  - added comment from Kim Phillips
>>    changed LCRR_MASK to 0x7fffffff
>>    use clrsetbits()
>
> Heiko - let's go with the SCCR approach of setting bits in the LCRR,
> and have board config files only specify values for fields they're
> modifying from the reset value for their processor (this can be
> extended to 85xx-world).

Did you guys ever come to resolution on this?  Realizing we have same  
issue on 85xx & 86xx (we dont actually set LCRR at all in cpu/ code  
for 85xx or 86xx.)

- k

[U-Boot] [PATCH] mpc83xx: retain POR values of non-configured ACR, SPCR, SCCR, and LCRR bitfields (was: Re: [PATCH v3] mpc83xx: update LCRR register handling)

[Kim Phillips]

On Tue, 15 Sep 2009 23:51:31 -0500
Kumar Gala <galak@kernel.crashing.org> wrote:

> On Aug 27, 2009, at 3:53 PM, Kim Phillips wrote:
> > Heiko - let's go with the SCCR approach of setting bits in the LCRR,
> > and have board config files only specify values for fields they're
> > modifying from the reset value for their processor (this can be
> > extended to 85xx-world).
> 
> Did you guys ever come to resolution on this?  Realizing we have same  
> issue on 85xx & 86xx (we dont actually set LCRR at all in cpu/ code  
> for 85xx or 86xx.)

this should probably be extended to SICRH, SICRL, etc., but how's this:?

[U-Boot] [PATCH] mpc83xx: retain POR values of non-configured ACR, SPCR, SCCR, and LCRR bitfields

[Heiko Schocher]

Hello Kim,

Kim Phillips wrote:
> On Tue, 15 Sep 2009 23:51:31 -0500
> Kumar Gala <galak@kernel.crashing.org> wrote:
> 
>> On Aug 27, 2009, at 3:53 PM, Kim Phillips wrote:
>>> Heiko - let's go with the SCCR approach of setting bits in the LCRR,
>>> and have board config files only specify values for fields they're
>>> modifying from the reset value for their processor (this can be
>>> extended to 85xx-world).
>> Did you guys ever come to resolution on this?  Realizing we have same  
>> issue on 85xx & 86xx (we dont actually set LCRR at all in cpu/ code  
>> for 85xx or 86xx.)
> 
> this should probably be extended to SICRH, SICRL, etc., but how's this:?
> 
>>From 15d01649e403ec7da20f5fdd25b8d2c1bccb6a8d Mon Sep 17 00:00:00 2001
> From: Kim Phillips <kim.phillips@freescale.com>
> Date: Fri, 25 Sep 2009 18:07:29 -0500
> Subject: [PATCH] mpc83xx: retain POR values of non-configured ACR, SPCR, SCCR, and LCRR bitfields
> 
> some LCRR bits are not documented throughout the 83xx family RMs.
> New board porters copying similar board configurations might omit
> setting e.g., DBYP since it was not documented in their SoC's RM.
> 
> Prevent them bricking their board by retaining power on reset values
> in bit fields that the board porter doesn't explicitly configure
> via CONFIG_SYS_<registername>_<bitfield> assignments in the board
> config file.
> 
> also start to use i/o accessors.
> 
> Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
> ---
>  cpu/mpc83xx/cpu_init.c        |  255 ++++++++++++++++++++++++-----------------
>  include/configs/MPC8313ERDB.h |    3 +-
>  include/configs/MPC8315ERDB.h |    3 +-
>  include/configs/MPC8323ERDB.h |    3 +-
>  include/configs/MPC832XEMDS.h |    3 +-
>  include/configs/MPC8349EMDS.h |    3 +-
>  include/configs/MPC8349ITX.h  |    3 +-
>  include/configs/MPC8360EMDS.h |    3 +-
>  include/configs/MPC8360ERDK.h |    3 +-
>  include/configs/MPC837XEMDS.h |    3 +-
>  include/configs/MPC837XERDB.h |    3 +-
>  include/configs/MVBLM7.h      |    3 +-
>  include/configs/SIMPC8313.h   |    4 +-
>  include/configs/TQM834x.h     |    3 +-
>  include/configs/kmeter1.h     |    4 +-
>  include/configs/sbc8349.h     |    3 +-
>  include/configs/vme8349.h     |    3 +-
>  17 files changed, 183 insertions(+), 122 deletions(-)
> 
> diff --git a/cpu/mpc83xx/cpu_init.c b/cpu/mpc83xx/cpu_init.c
> index 5c930d3..95dbc76 100644
> --- a/cpu/mpc83xx/cpu_init.c
> +++ b/cpu/mpc83xx/cpu_init.c
> @@ -23,8 +23,8 @@
>  #include <common.h>
>  #include <mpc83xx.h>
>  #include <ioports.h>
> -#ifdef CONFIG_USB_EHCI_FSL
>  #include <asm/io.h>
> +#ifdef CONFIG_USB_EHCI_FSL
>  #include <usb/ehci-fsl.h>
>  #endif
>  
> @@ -63,149 +63,192 @@ static void config_qe_ioports(void)
>   */
>  void cpu_init_f (volatile immap_t * im)
>  {
> -	/* Pointer is writable since we allocated a register for it */
[...]
>  
> -	/* LCRR - Clock Ratio Register (10.3.1.16) */
> -	im->lbus.lcrr = CONFIG_SYS_LCRR;
> +	/* LCRR - Clock Ratio Register (10.3.1.16)
> +	 * write, read, and isync per MPC8379ERM rev.1 CLKDEV field description
> +	 */
> +	clrsetbits_be32(&im->lbus.lcrr, lcrr_mask, lcrr_val);
> +	__raw_readl(&im->lbus.lcrr);
> +	isync();

Hmm.. shouldn;t this be done when running from RAM, as DaveLiu
suggested?

bye
Heiko
-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

[U-Boot] [PATCH] mpc83xx: retain POR values of non-configured ACR, SPCR, SCCR, and LCRR bitfields

[Kim Phillips]

On Sat, 26 Sep 2009 12:37:40 +0200
Heiko Schocher <hs@denx.de> wrote:

> Kim Phillips wrote:
> > -	/* LCRR - Clock Ratio Register (10.3.1.16) */
> > -	im->lbus.lcrr = CONFIG_SYS_LCRR;
> > +	/* LCRR - Clock Ratio Register (10.3.1.16)
> > +	 * write, read, and isync per MPC8379ERM rev.1 CLKDEV field description
> > +	 */
> > +	clrsetbits_be32(&im->lbus.lcrr, lcrr_mask, lcrr_val);
> > +	__raw_readl(&im->lbus.lcrr);
> > +	isync();
> 
> Hmm.. shouldn;t this be done when running from RAM, as DaveLiu
> suggested?

oh, I suppose so ;).  here's v2:

From: Kim Phillips <kim.phillips@freescale.com>
Date: Fri, 25 Sep 2009 18:19:44 -0500
Subject: [PATCH] mpc83xx: retain POR values of non-configured ACR, SPCR, SCCR, and LCRR bitfields

some LCRR bits are not documented throughout the 83xx family RMs.
New board porters copying similar board configurations might omit
setting e.g., DBYP since it was not documented in their SoC's RM.

Prevent them bricking their board by retaining power on reset values
in bit fields that the board porter doesn't explicitly configure
via CONFIG_SYS_<registername>_<bitfield> assignments in the board
config file.

also move LCRR assignment to cpu_init_r[am] to help ensure no
transactions are being executed via the local bus while CLKDIV is being
modified.

also start to use i/o accessors.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
---
 cpu/mpc83xx/cpu_init.c        |  262 ++++++++++++++++++++++++-----------------
 include/configs/MPC8313ERDB.h |    3 +-
 include/configs/MPC8315ERDB.h |    3 +-
 include/configs/MPC8323ERDB.h |    3 +-
 include/configs/MPC832XEMDS.h |    3 +-
 include/configs/MPC8349EMDS.h |    3 +-
 include/configs/MPC8349ITX.h  |    3 +-
 include/configs/MPC8360EMDS.h |    3 +-
 include/configs/MPC8360ERDK.h |    3 +-
 include/configs/MPC837XEMDS.h |    3 +-
 include/configs/MPC837XERDB.h |    3 +-
 include/configs/MVBLM7.h      |    3 +-
 include/configs/SIMPC8313.h   |    4 +-
 include/configs/TQM834x.h     |    3 +-
 include/configs/kmeter1.h     |    4 +-
 include/configs/sbc8349.h     |    3 +-
 include/configs/vme8349.h     |    3 +-
 17 files changed, 189 insertions(+), 123 deletions(-)

diff --git a/cpu/mpc83xx/cpu_init.c b/cpu/mpc83xx/cpu_init.c
index 5c930d3..cd69773 100644
--- a/cpu/mpc83xx/cpu_init.c
+++ b/cpu/mpc83xx/cpu_init.c
@@ -23,8 +23,8 @@
 #include <common.h>
 #include <mpc83xx.h>
 #include <ioports.h>
-#ifdef CONFIG_USB_EHCI_FSL
 #include <asm/io.h>
+#ifdef CONFIG_USB_EHCI_FSL
 #include <usb/ehci-fsl.h>
 #endif
 
@@ -63,149 +63,163 @@ static void config_qe_ioports(void)
  */
 void cpu_init_f (volatile immap_t * im)
 {
-	/* Pointer is writable since we allocated a register for it */
-	gd = (gd_t *) (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
-
-	/* Clear initial global data */
-	memset ((void *) gd, 0, sizeof (gd_t));
-
-	/* system performance tweaking */
-
-#ifdef CONFIG_SYS_ACR_PIPE_DEP
-	/* Arbiter pipeline depth */
-	im->arbiter.acr = (im->arbiter.acr & ~ACR_PIPE_DEP) |
-			  (CONFIG_SYS_ACR_PIPE_DEP << ACR_PIPE_DEP_SHIFT);
+	__be32 acr_mask =
+#ifdef CONFIG_SYS_ACR_PIPE_DEP /* Arbiter pipeline depth */
+		(ACR_PIPE_DEP << ACR_PIPE_DEP_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_ACR_RPTCNT
-	/* Arbiter repeat count */
-	im->arbiter.acr = (im->arbiter.acr & ~(ACR_RPTCNT)) |
-			  (CONFIG_SYS_ACR_RPTCNT << ACR_RPTCNT_SHIFT);
+#ifdef CONFIG_SYS_ACR_RPTCNT /* Arbiter repeat count */
+		(ACR_RPTCNT << ACR_RPTCNT_SHIFT) |
 #endif
-
+		0;
+	__be32 acr_val =
+#ifdef CONFIG_SYS_ACR_PIPE_DEP /* Arbiter pipeline depth */
+		(CONFIG_SYS_ACR_PIPE_DEP << ACR_PIPE_DEP_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_ACR_RPTCNT /* Arbiter repeat count */
+		(CONFIG_SYS_ACR_RPTCNT << ACR_RPTCNT_SHIFT) |
+#endif
+		0;
+	__be32 spcr_mask =
+#ifdef CONFIG_SYS_SPCR_OPT /* Optimize transactions between CSB and other dev */
+		(SPCR_OPT << SPCR_OPT_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_SPCR_TSECEP /* all eTSEC's Emergency priority */
+		(SPCR_TSECEP << SPCR_TSECEP_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_SPCR_TSEC1EP /* TSEC1 Emergency priority */
+		(SPCR_TSEC1EP << SPCR_TSEC1EP_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_SPCR_TSEC2EP /* TSEC2 Emergency priority */
+		(SPCR_TSEC2EP << SPCR_TSEC2EP_SHIFT) |
+#endif
+		0;
+	__be32 spcr_val =
 #ifdef CONFIG_SYS_SPCR_OPT
-	/* Optimize transactions between CSB and other devices */
-	im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_OPT) |
-			   (CONFIG_SYS_SPCR_OPT << SPCR_OPT_SHIFT);
+		(CONFIG_SYS_SPCR_OPT << SPCR_OPT_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_SPCR_TSECEP
-	/* all eTSEC's Emergency priority */
-	im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_TSECEP) |
-			   (CONFIG_SYS_SPCR_TSECEP << SPCR_TSECEP_SHIFT);
+#ifdef CONFIG_SYS_SPCR_TSECEP /* all eTSEC's Emergency priority */
+		(CONFIG_SYS_SPCR_TSECEP << SPCR_TSECEP_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_SPCR_TSEC1EP
-	/* TSEC1 Emergency priority */
-	im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_TSEC1EP) |
-			   (CONFIG_SYS_SPCR_TSEC1EP << SPCR_TSEC1EP_SHIFT);
+#ifdef CONFIG_SYS_SPCR_TSEC1EP /* TSEC1 Emergency priority */
+		(CONFIG_SYS_SPCR_TSEC1EP << SPCR_TSEC1EP_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_SPCR_TSEC2EP
-	/* TSEC2 Emergency priority */
-	im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_TSEC2EP) |
-			   (CONFIG_SYS_SPCR_TSEC2EP << SPCR_TSEC2EP_SHIFT);
+#ifdef CONFIG_SYS_SPCR_TSEC2EP /* TSEC2 Emergency priority */
+		(CONFIG_SYS_SPCR_TSEC2EP << SPCR_TSEC2EP_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_SCCR_ENCCM
-	/* Encryption clock mode */
-	im->clk.sccr = (im->clk.sccr & ~SCCR_ENCCM) |
-		       (CONFIG_SYS_SCCR_ENCCM << SCCR_ENCCM_SHIFT);
+		0;
+	__be32 sccr_mask =
+#ifdef CONFIG_SYS_SCCR_ENCCM /* Encryption clock mode */
+		(SCCR_ENCCM << SCCR_ENCCM_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_SCCR_PCICM
-	/* PCI & DMA clock mode */
-	im->clk.sccr = (im->clk.sccr & ~SCCR_PCICM) |
-		       (CONFIG_SYS_SCCR_PCICM << SCCR_PCICM_SHIFT);
+#ifdef CONFIG_SYS_SCCR_PCICM /* PCI & DMA clock mode */
+		(SCCR_PCICM << SCCR_PCICM_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_SCCR_TSECCM
-	/* all TSEC's clock mode */
-	im->clk.sccr = (im->clk.sccr & ~SCCR_TSECCM) |
-		       (CONFIG_SYS_SCCR_TSECCM << SCCR_TSECCM_SHIFT);
+#ifdef CONFIG_SYS_SCCR_TSECCM /* all TSEC's clock mode */
+		(SCCR_TSECCM << SCCR_TSECCM_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_SCCR_TSEC1CM
-	/* TSEC1 clock mode */
-	im->clk.sccr = (im->clk.sccr & ~SCCR_TSEC1CM) |
-		       (CONFIG_SYS_SCCR_TSEC1CM << SCCR_TSEC1CM_SHIFT);
+#ifdef CONFIG_SYS_SCCR_TSEC1CM /* TSEC1 clock mode */
+		(SCCR_TSEC1CM << SCCR_TSEC1CM_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_SCCR_TSEC2CM
-	/* TSEC2 clock mode */
-	im->clk.sccr = (im->clk.sccr & ~SCCR_TSEC2CM) |
-		       (CONFIG_SYS_SCCR_TSEC2CM << SCCR_TSEC2CM_SHIFT);
+#ifdef CONFIG_SYS_SCCR_TSEC2CM /* TSEC2 clock mode */
+		(SCCR_TSEC2CM << SCCR_TSEC2CM_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_SCCR_TSEC1ON
-	/* TSEC1 clock switch */
-	im->clk.sccr = (im->clk.sccr & ~SCCR_TSEC1ON) |
-		       (CONFIG_SYS_SCCR_TSEC1ON << SCCR_TSEC1ON_SHIFT);
+#ifdef CONFIG_SYS_SCCR_TSEC1ON /* TSEC1 clock switch */
+		(SCCR_TSEC1ON << SCCR_TSEC1ON_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_SCCR_TSEC2ON
-	/* TSEC2 clock switch */
-	im->clk.sccr = (im->clk.sccr & ~SCCR_TSEC2ON) |
-		       (CONFIG_SYS_SCCR_TSEC2ON << SCCR_TSEC2ON_SHIFT);
+#ifdef CONFIG_SYS_SCCR_TSEC2ON /* TSEC2 clock switch */
+		(SCCR_TSEC2ON << SCCR_TSEC2ON_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_SCCR_USBMPHCM
-	/* USB MPH clock mode */
-	im->clk.sccr = (im->clk.sccr & ~SCCR_USBMPHCM) |
-		       (CONFIG_SYS_SCCR_USBMPHCM << SCCR_USBMPHCM_SHIFT);
+#ifdef CONFIG_SYS_SCCR_USBMPHCM /* USB MPH clock mode */
+		(SCCR_USBMPHCM << SCCR_USBMPHCM_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_SCCR_USBDRCM
-	/* USB DR clock mode */
-	im->clk.sccr = (im->clk.sccr & ~SCCR_USBDRCM) |
-		       (CONFIG_SYS_SCCR_USBDRCM << SCCR_USBDRCM_SHIFT);
+#ifdef CONFIG_SYS_SCCR_USBDRCM /* USB DR clock mode */
+		(SCCR_USBDRCM << SCCR_USBDRCM_SHIFT) |
 #endif
-
-#ifdef CONFIG_SYS_SCCR_SATACM
-	/* SATA controller clock mode */
-	im->clk.sccr = (im->clk.sccr & ~SCCR_SATACM) |
-		       (CONFIG_SYS_SCCR_SATACM << SCCR_SATACM_SHIFT);
+#ifdef CONFIG_SYS_SCCR_SATACM /* SATA controller clock mode */
+		(SCCR_SATACM << SCCR_SATACM_SHIFT) |
+#endif
+		0;
+	__be32 sccr_val =
+#ifdef CONFIG_SYS_SCCR_ENCCM /* Encryption clock mode */
+		(CONFIG_SYS_SCCR_ENCCM << SCCR_ENCCM_SHIFT) |
 #endif
+#ifdef CONFIG_SYS_SCCR_PCICM /* PCI & DMA clock mode */
+		(CONFIG_SYS_SCCR_PCICM << SCCR_PCICM_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_SCCR_TSECCM /* all TSEC's clock mode */
+		(CONFIG_SYS_SCCR_TSECCM << SCCR_TSECCM_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_SCCR_TSEC1CM /* TSEC1 clock mode */
+		(CONFIG_SYS_SCCR_TSEC1CM << SCCR_TSEC1CM_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_SCCR_TSEC2CM /* TSEC2 clock mode */
+		(CONFIG_SYS_SCCR_TSEC2CM << SCCR_TSEC2CM_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_SCCR_TSEC1ON /* TSEC1 clock switch */
+		(CONFIG_SYS_SCCR_TSEC1ON << SCCR_TSEC1ON_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_SCCR_TSEC2ON /* TSEC2 clock switch */
+		(CONFIG_SYS_SCCR_TSEC2ON << SCCR_TSEC2ON_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_SCCR_USBMPHCM /* USB MPH clock mode */
+		(CONFIG_SYS_SCCR_USBMPHCM << SCCR_USBMPHCM_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_SCCR_USBDRCM /* USB DR clock mode */
+		(CONFIG_SYS_SCCR_USBDRCM << SCCR_USBDRCM_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_SCCR_SATACM /* SATA controller clock mode */
+		(CONFIG_SYS_SCCR_SATACM << SCCR_SATACM_SHIFT) |
+#endif
+		0;
+
+	/* Pointer is writable since we allocated a register for it */
+	gd = (gd_t *) (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
+
+	/* Clear initial global data */
+	memset ((void *) gd, 0, sizeof (gd_t));
+
+	/* system performance tweaking */
+	clrsetbits_be32(&im->arbiter.acr, acr_mask, acr_val);
+
+	clrsetbits_be32(&im->sysconf.spcr, spcr_mask, spcr_val);
+
+	clrsetbits_be32(&im->clk.sccr, sccr_mask, sccr_val);
 
 	/* RSR - Reset Status Register - clear all status (4.6.1.3) */
-	gd->reset_status = im->reset.rsr;
-	im->reset.rsr = ~(RSR_RES);
+	gd->reset_status = __raw_readl(&im->reset.rsr);
+	__raw_writel(~(RSR_RES), &im->reset.rsr);
 
 	/* AER - Arbiter Event Register - store status */
-	gd->arbiter_event_attributes = im->arbiter.aeatr;
-	gd->arbiter_event_address = im->arbiter.aeadr;
+	gd->arbiter_event_attributes = __raw_readl(&im->arbiter.aeatr);
+	gd->arbiter_event_address = __raw_readl(&im->arbiter.aeadr);
 
 	/*
 	 * RMR - Reset Mode Register
 	 * contains checkstop reset enable (4.6.1.4)
 	 */
-	im->reset.rmr = (RMR_CSRE & (1<<RMR_CSRE_SHIFT));
-
-	/* LCRR - Clock Ratio Register (10.3.1.16) */
-	im->lbus.lcrr = CONFIG_SYS_LCRR;
+	__raw_writel(RMR_CSRE & (1<<RMR_CSRE_SHIFT), &im->reset.rmr);
 
-	/* Enable Time Base & Decrimenter ( so we will have udelay() )*/
-	im->sysconf.spcr |= SPCR_TBEN;
+	/* Enable Time Base & Decrementer ( so we will have udelay() )*/
+	setbits_be32(&im->sysconf.spcr, SPCR_TBEN);
 
 	/* System General Purpose Register */
 #ifdef CONFIG_SYS_SICRH
 #if defined(CONFIG_MPC834x) || defined(CONFIG_MPC8313)
 	/* regarding to MPC34x manual rev.1 bits 28..29 must be preserved */
-	im->sysconf.sicrh = (im->sysconf.sicrh & 0x0000000C) | CONFIG_SYS_SICRH;
+	__raw_writel((im->sysconf.sicrh & 0x0000000C) | CONFIG_SYS_SICRH,
+		     &im->sysconf.sicrh);
 #else
-	im->sysconf.sicrh = CONFIG_SYS_SICRH;
+	__raw_writel(CONFIG_SYS_SICRH, &im->sysconf.sicrh);
 #endif
 #endif
 #ifdef CONFIG_SYS_SICRL
-	im->sysconf.sicrl = CONFIG_SYS_SICRL;
+	__raw_writel(CONFIG_SYS_SICRL, &im->sysconf.sicrl);
 #endif
-	/* DDR control driver register */
-#ifdef CONFIG_SYS_DDRCDR
-	im->sysconf.ddrcdr = CONFIG_SYS_DDRCDR;
+#ifdef CONFIG_SYS_DDRCDR /* DDR control driver register */
+	__raw_writel(CONFIG_SYS_DDRCDR, &im->sysconf.ddrcdr);
 #endif
-	/* Output buffer impedance register */
-#ifdef CONFIG_SYS_OBIR
-	im->sysconf.obir = CONFIG_SYS_OBIR;
+#ifdef CONFIG_SYS_OBIR /* Output buffer impedance register */
+	__raw_writel(CONFIG_SYS_OBIR, &im->sysconf.obir);
 #endif
 
 #ifdef CONFIG_QE
@@ -308,7 +322,7 @@ void cpu_init_f (volatile immap_t * im)
 
 	/* Wait for clock to stabilize */
 	do {
-		temp = in_be32(&ehci->control);
+		temp = __raw_readl(&ehci->control);
 		udelay(1000);
 	} while (!(temp & PHY_CLK_VALID));
 #endif
@@ -317,6 +331,40 @@ void cpu_init_f (volatile immap_t * im)
 
 int cpu_init_r (void)
 {
+	volatile immap_t *im = (volatile immap_t *)CONFIG_SYS_IMMR;
+#ifdef CONFIG_QE
+	uint qe_base = CONFIG_SYS_IMMR + 0x00100000; /* QE immr base */
+#endif
+	__be32 lcrr_mask =
+#ifdef CONFIG_SYS_LCRR_DBYP /* PLL bypass */
+		LCRR_DBYP |
+#endif
+#ifdef CONFIG_SYS_LCRR_EADC /* external address delay */
+		LCRR_EADC |
+#endif
+#ifdef CONFIG_SYS_LCRR_CLKDIV /* system clock divider */
+		LCRR_CLKDIV |
+#endif
+		0;
+	__be32 lcrr_val =
+#ifdef CONFIG_SYS_LCRR_DBYP /* PLL bypass */
+		CONFIG_SYS_LCRR_DBYP |
+#endif
+#ifdef CONFIG_SYS_LCRR_EADC
+		CONFIG_SYS_LCRR_EADC |
+#endif
+#ifdef CONFIG_SYS_LCRR_CLKDIV /* system clock divider */
+		CONFIG_SYS_LCRR_CLKDIV |
+#endif
+		0;
+
+	/* LCRR - Clock Ratio Register (10.3.1.16)
+	 * write, read, and isync per MPC8379ERM rev.1 CLKDEV field description
+	 */
+	clrsetbits_be32(&im->lbus.lcrr, lcrr_mask, lcrr_val);
+	__raw_readl(&im->lbus.lcrr);
+	isync();
+
 #ifdef CONFIG_QE
 	uint qe_base = CONFIG_SYS_IMMR + 0x00100000; /* QE immr base */
 	qe_init(qe_base);
diff --git a/include/configs/MPC8313ERDB.h b/include/configs/MPC8313ERDB.h
index 76b7894..5927e76 100644
--- a/include/configs/MPC8313ERDB.h
+++ b/include/configs/MPC8313ERDB.h
@@ -216,7 +216,8 @@
 /*
  * Local Bus LCRR and LBCR regs
  */
-#define CONFIG_SYS_LCRR	LCRR_EADC_1 | LCRR_CLKDIV_4
+#define CONFIG_SYS_LCRR_EADC	LCRR_EADC_1
+#define CONFIG_SYS_LCRR_CLKDIV	LCRR_CLKDIV_4
 #define CONFIG_SYS_LBC_LBCR	( 0x00040000 /* TODO */ \
 			| (0xFF << LBCR_BMT_SHIFT) \
 			| 0xF )	/* 0x0004ff0f */
diff --git a/include/configs/MPC8315ERDB.h b/include/configs/MPC8315ERDB.h
index 84cc9fa..8eaff5d 100644
--- a/include/configs/MPC8315ERDB.h
+++ b/include/configs/MPC8315ERDB.h
@@ -182,7 +182,8 @@
 /*
  * Local Bus Configuration & Clock Setup
  */
-#define CONFIG_SYS_LCRR		(LCRR_DBYP | LCRR_CLKDIV_2)
+#define CONFIG_SYS_LCRR_DBYP	LCRR_DBYP
+#define CONFIG_SYS_LCRR_CLKDIV		LCRR_CLKDIV_2
 #define CONFIG_SYS_LBC_LBCR		0x00040000
 
 /*
diff --git a/include/configs/MPC8323ERDB.h b/include/configs/MPC8323ERDB.h
index c40d3d3..356586c 100644
--- a/include/configs/MPC8323ERDB.h
+++ b/include/configs/MPC8323ERDB.h
@@ -170,7 +170,8 @@
 /*
  * Local Bus Configuration & Clock Setup
  */
-#define CONFIG_SYS_LCRR		(LCRR_DBYP | LCRR_CLKDIV_2)
+#define CONFIG_SYS_LCRR_DBYP		LCRR_DBYP
+#define CONFIG_SYS_LCRR_CLKDIV		LCRR_CLKDIV_2
 #define CONFIG_SYS_LBC_LBCR		0x00000000
 
 /*
diff --git a/include/configs/MPC832XEMDS.h b/include/configs/MPC832XEMDS.h
index f16616c..f17f9c7 100644
--- a/include/configs/MPC832XEMDS.h
+++ b/include/configs/MPC832XEMDS.h
@@ -159,7 +159,8 @@
 /*
  * Local Bus Configuration & Clock Setup
  */
-#define CONFIG_SYS_LCRR		(LCRR_DBYP | LCRR_CLKDIV_2)
+#define CONFIG_SYS_LCRR_DBYP		LCRR_DBYP
+#define CONFIG_SYS_LCRR_CLKDIV		LCRR_CLKDIV_2
 #define CONFIG_SYS_LBC_LBCR		0x00000000
 
 /*
diff --git a/include/configs/MPC8349EMDS.h b/include/configs/MPC8349EMDS.h
index 9b2d25a..6361c45 100644
--- a/include/configs/MPC8349EMDS.h
+++ b/include/configs/MPC8349EMDS.h
@@ -206,7 +206,8 @@
  * External Local Bus rate is
  *    CLKIN * HRCWL_CSB_TO_CLKIN / HRCWL_LCL_BUS_TO_SCB_CLK / LCRR_CLKDIV
  */
-#define CONFIG_SYS_LCRR	(LCRR_DBYP | LCRR_CLKDIV_4)
+#define CONFIG_SYS_LCRR_DBYP		LCRR_DBYP
+#define CONFIG_SYS_LCRR_CLKDIV		LCRR_CLKDIV_4
 #define CONFIG_SYS_LBC_LBCR	0x00000000
 
 /*
diff --git a/include/configs/MPC8349ITX.h b/include/configs/MPC8349ITX.h
index 3b4e344..eaa59fd 100644
--- a/include/configs/MPC8349ITX.h
+++ b/include/configs/MPC8349ITX.h
@@ -317,7 +317,8 @@ boards, we say we have two, but don't display a message if we find only one. */
  * External Local Bus rate is
  *    CLKIN * HRCWL_CSB_TO_CLKIN / HRCWL_LCL_BUS_TO_SCB_CLK / LCRR_CLKDIV
  */
-#define CONFIG_SYS_LCRR	(LCRR_DBYP | LCRR_CLKDIV_4)
+#define CONFIG_SYS_LCRR_DBYP	LCRR_DBYP
+#define CONFIG_SYS_LCRR_CLKDIV	LCRR_CLKDIV_4
 #define CONFIG_SYS_LBC_LBCR	0x00000000
 
 #define CONFIG_SYS_LBC_LSRT	0x32000000    /* LB sdram refresh timer, about 6us */
diff --git a/include/configs/MPC8360EMDS.h b/include/configs/MPC8360EMDS.h
index 62cf13b..8520155 100644
--- a/include/configs/MPC8360EMDS.h
+++ b/include/configs/MPC8360EMDS.h
@@ -185,7 +185,8 @@
 /*
  * Local Bus Configuration & Clock Setup
  */
-#define CONFIG_SYS_LCRR		(LCRR_DBYP | LCRR_CLKDIV_4)
+#define CONFIG_SYS_LCRR_DBYP	LCRR_DBYP
+#define CONFIG_SYS_LCRR_CLKDIV	LCRR_CLKDIV_4
 #define CONFIG_SYS_LBC_LBCR		0x00000000
 
 /*
diff --git a/include/configs/MPC8360ERDK.h b/include/configs/MPC8360ERDK.h
index cb0535c..6cee78a 100644
--- a/include/configs/MPC8360ERDK.h
+++ b/include/configs/MPC8360ERDK.h
@@ -177,7 +177,8 @@
 /*
  * Local Bus Configuration & Clock Setup
  */
-#define CONFIG_SYS_LCRR		(LCRR_DBYP | LCRR_CLKDIV_4)
+#define CONFIG_SYS_LCRR_DBYP	LCRR_DBYP
+#define CONFIG_SYS_LCRR_CLKDIV	LCRR_CLKDIV_4
 #define CONFIG_SYS_LBC_LBCR		0x00000000
 
 /*
diff --git a/include/configs/MPC837XEMDS.h b/include/configs/MPC837XEMDS.h
index a190a50..abeb6a2 100644
--- a/include/configs/MPC837XEMDS.h
+++ b/include/configs/MPC837XEMDS.h
@@ -220,7 +220,8 @@
 /*
  * Local Bus Configuration & Clock Setup
  */
-#define CONFIG_SYS_LCRR		(LCRR_DBYP | LCRR_CLKDIV_8)
+#define CONFIG_SYS_LCRR_DBYP	LCRR_DBYP
+#define CONFIG_SYS_LCRR_CLKDIV	LCRR_CLKDIV_8
 #define CONFIG_SYS_LBC_LBCR		0x00000000
 
 /*
diff --git a/include/configs/MPC837XERDB.h b/include/configs/MPC837XERDB.h
index 89fafe7..7ef92f7 100644
--- a/include/configs/MPC837XERDB.h
+++ b/include/configs/MPC837XERDB.h
@@ -243,7 +243,8 @@
 /*
  * Local Bus Configuration & Clock Setup
  */
-#define CONFIG_SYS_LCRR		(LCRR_DBYP | LCRR_CLKDIV_8)
+#define CONFIG_SYS_LCRR_DBYP	LCRR_DBYP
+#define CONFIG_SYS_LCRR_CLKDIV	LCRR_CLKDIV_8
 #define CONFIG_SYS_LBC_LBCR		0x00000000
 
 /*
diff --git a/include/configs/MVBLM7.h b/include/configs/MVBLM7.h
index 9835567..f8b016f 100644
--- a/include/configs/MVBLM7.h
+++ b/include/configs/MVBLM7.h
@@ -137,7 +137,8 @@
  * External Local Bus rate is
  *  CLKIN * HRCWL_CSB_TO_CLKIN / HRCWL_LCL_BUS_TO_SCB_CLK / LCRR_CLKDIV
  */
-#define CONFIG_SYS_LCRR	(LCRR_DBYP | LCRR_CLKDIV_4)
+#define CONFIG_SYS_LCRR_DBYP	LCRR_DBYP
+#define CONFIG_SYS_LCRR_CLKDIV	LCRR_CLKDIV_4
 #define CONFIG_SYS_LBC_LBCR	0x00000000
 
 /* LB sdram refresh timer, about 6us */
diff --git a/include/configs/SIMPC8313.h b/include/configs/SIMPC8313.h
index 866ff17..f68d834 100644
--- a/include/configs/SIMPC8313.h
+++ b/include/configs/SIMPC8313.h
@@ -111,7 +111,9 @@
 /*
  * Local Bus LCRR and LBCR regs
  */
-#define CONFIG_SYS_LCRR		(LCRR_DBYP | LCRR_EADC_1 | LCRR_CLKDIV_2)
+#define CONFIG_SYS_LCRR_DBYP	LCRR_DBYP
+#define CONFIG_SYS_LCRR_EADC	LCRR_EADC_1
+#define CONFIG_SYS_LCRR_CLKDIV	LCRR_CLKDIV_2
 #define CONFIG_SYS_LBC_LBCR	(0x00040000 /* TODO */ \
 				| (0xFF << LBCR_BMT_SHIFT) \
 				| 0xF )	/* 0x0004ff0f */
diff --git a/include/configs/TQM834x.h b/include/configs/TQM834x.h
index da08b7c..4c909e6 100644
--- a/include/configs/TQM834x.h
+++ b/include/configs/TQM834x.h
@@ -52,7 +52,8 @@
  * External Local Bus rate is
  *    CLKIN * HRCWL_CSB_TO_CLKIN / HRCWL_LCL_BUS_TO_SCB_CLK / LCRR_CLKDIV
  */
-#define CONFIG_SYS_LCRR		(LCRR_DBYP | LCRR_CLKDIV_8)
+#define CONFIG_SYS_LCRR_DBYP	LCRR_DBYP
+#define CONFIG_SYS_LCRR_CLKDIV	LCRR_CLKDIV_8
 
 /* board pre init: do not call, nothing to do */
 #undef CONFIG_BOARD_EARLY_INIT_F
diff --git a/include/configs/kmeter1.h b/include/configs/kmeter1.h
index 79d8638..bec08da 100644
--- a/include/configs/kmeter1.h
+++ b/include/configs/kmeter1.h
@@ -170,7 +170,9 @@
 /*
  * Local Bus Configuration & Clock Setup
  */
-#define CONFIG_SYS_LCRR		(LCRR_DBYP | LCRR_EADC_2 | LCRR_CLKDIV_4)
+#define CONFIG_SYS_LCRR_DBYP	LCRR_DBYP
+#define CONFIG_SYS_LCRR_EADC	LCRR_EADC_2
+#define CONFIG_SYS_LCRR_CLKDIV	LCRR_CLKDIV_4
 
 /*
  * Init Local Bus Memory Controller:
diff --git a/include/configs/sbc8349.h b/include/configs/sbc8349.h
index 6f574ca..bf7cf82 100644
--- a/include/configs/sbc8349.h
+++ b/include/configs/sbc8349.h
@@ -197,7 +197,8 @@
  * External Local Bus rate is
  *    CLKIN * HRCWL_CSB_TO_CLKIN / HRCWL_LCL_BUS_TO_SCB_CLK / LCRR_CLKDIV
  */
-#define CONFIG_SYS_LCRR	(LCRR_DBYP | LCRR_CLKDIV_4)
+#define CONFIG_SYS_LCRR_DBYP	LCRR_DBYP
+#define CONFIG_SYS_LCRR_CLKDIV	LCRR_CLKDIV_4
 #define CONFIG_SYS_LBC_LBCR	0x00000000
 
 #undef CONFIG_SYS_LB_SDRAM	/* if board has SDRAM on local bus */
diff --git a/include/configs/vme8349.h b/include/configs/vme8349.h
index 5304ec9..d0690fe 100644
--- a/include/configs/vme8349.h
+++ b/include/configs/vme8349.h
@@ -178,7 +178,8 @@
  * External Local Bus rate is
  *    CLKIN * HRCWL_CSB_TO_CLKIN / HRCWL_LCL_BUS_TO_SCB_CLK / LCRR_CLKDIV
  */
-#define CONFIG_SYS_LCRR		(LCRR_DBYP | LCRR_CLKDIV_4)
+#define CONFIG_SYS_LCRR_DBYP	LCRR_DBYP
+#define CONFIG_SYS_LCRR_CLKDIV	LCRR_CLKDIV_4
 #define CONFIG_SYS_LBC_LBCR	0x00000000
 
 #undef CONFIG_SYS_LB_SDRAM	/* if board has SDRAM on local bus */
-- 
1.6.3

[U-Boot] [PATCH] mpc83xx: retain POR values of non-configured ACR, SPCR, SCCR, and LCRR bitfields

[Kim Phillips]

On Sat, 26 Sep 2009 20:46:42 -0500
Kim Phillips <kim.phillips@freescale.com> wrote:

> On Sat, 26 Sep 2009 12:37:40 +0200
> Heiko Schocher <hs@denx.de> wrote:
> 
> > Kim Phillips wrote:
> > > -	/* LCRR - Clock Ratio Register (10.3.1.16) */
> > > -	im->lbus.lcrr = CONFIG_SYS_LCRR;
> > > +	/* LCRR - Clock Ratio Register (10.3.1.16)
> > > +	 * write, read, and isync per MPC8379ERM rev.1 CLKDEV field description
> > > +	 */
> > > +	clrsetbits_be32(&im->lbus.lcrr, lcrr_mask, lcrr_val);
> > > +	__raw_readl(&im->lbus.lcrr);
> > > +	isync();
> > 
> > Hmm.. shouldn;t this be done when running from RAM, as DaveLiu
> > suggested?
> 
> oh, I suppose so ;).  here's v2:

and now v3 (I had left a qe_base redefinition in v2):

[U-Boot] [PATCH v2] mpc83xx: update LCRR register handling

[Detlev Zundel]

Hi Kim,

> o LCRR_PDYP, granted dangerous in your case, is obviously a writeable
> bit (not read-only), and documented as such in later documentation.  In
> fact, there are no non-writeable bits in LCRR.

Well, "reserved" != "non-writable" (usually there is a comment that
writing reserved bits produces undefined behaviour) so I agree with
Heiko that as long the documentation that we have access to, designates
bits as reserved, it makes sense to have such a mask.

> o the user loses visibility into what is going on if they
> decide to drop/add sensitive bits such as LCRR_DBYP in their board's
> CONFIG_SYS_LCRR settings, and there's a mask lurking in the background.
>
> o let's be practical here - in a board port, LCRR settings have to be
> paid attention to, no matter what hidden behaviours or new bits there
> are lying underneath - perhaps the form of 'protection' you seek is in
> the form of a comment in the code?

So what is it that you propose?  That Heiko uses a LCRR in his board
config (over-)writing reserved bits?

Cheers
  Detlev

-- 
vi vi vi - the roman numeral of the beast.
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de

[U-Boot] [PATCH v2] mpc83xx: update LCRR register handling

[Kim Phillips]

On Thu, 27 Aug 2009 13:11:25 +0200
Detlev Zundel <dzu@denx.de> wrote:

> Hi Kim,
> 
> > o LCRR_PDYP, granted dangerous in your case, is obviously a writeable
> > bit (not read-only), and documented as such in later documentation.  In
> > fact, there are no non-writeable bits in LCRR.
> 
> Well, "reserved" != "non-writable" (usually there is a comment that
> writing reserved bits produces undefined behaviour) so I agree with
> Heiko that as long the documentation that we have access to, designates
> bits as reserved, it makes sense to have such a mask.

I think we should allow board-configurable writes to the DBYP bit, which
is documented as "reserved" on some 83xx, on the 83xx parts that /do/
implement it.  So instead of having a mask, perhaps setting absolute
values for CONFIG_SYS_LCRR should be replaced with a better scheme that
allows board configs to just set LCRR bits by field, such as what the
SCCR setting code does.  I.e, deprecate CONFIG_SYS_LCRR and replace with
individually-specified CONFIG_SYS_LCRR_{CLKDIV,EADC,ECL,BUDCMDC,DBYP}
values.

This will allow the reserved bits, whether 1 on reset or
not, to be preserved across all 83xx (and 85xx for that matter).

> > o the user loses visibility into what is going on if they
> > decide to drop/add sensitive bits such as LCRR_DBYP in their board's
> > CONFIG_SYS_LCRR settings, and there's a mask lurking in the background.
> >
> > o let's be practical here - in a board port, LCRR settings have to be
> > paid attention to, no matter what hidden behaviours or new bits there
> > are lying underneath - perhaps the form of 'protection' you seek is in
> > the form of a comment in the code?
> 
> So what is it that you propose?  That Heiko uses a LCRR in his board
> config (over-)writing reserved bits?

that's what other boards do (like the 8323erdb), but I do see the
problem for the new board porter - they don't see the bit in their
documentation, so they omit it.

but I presume the above fix will allow Heiko and other new board
porters happy?

I'll send a patch out this weekend unless someone beats me to it.

Kim

[U-Boot] [PATCH v2] mpc83xx: update LCRR register handling

[Detlev Zundel]

Hi Kim,

> On Thu, 27 Aug 2009 13:11:25 +0200
> Detlev Zundel <dzu@denx.de> wrote:
>
>> Hi Kim,
>> 
>> > o LCRR_PDYP, granted dangerous in your case, is obviously a writeable
>> > bit (not read-only), and documented as such in later documentation.  In
>> > fact, there are no non-writeable bits in LCRR.
>> 
>> Well, "reserved" != "non-writable" (usually there is a comment that
>> writing reserved bits produces undefined behaviour) so I agree with
>> Heiko that as long the documentation that we have access to, designates
>> bits as reserved, it makes sense to have such a mask.
>
> I think we should allow board-configurable writes to the DBYP bit, which
> is documented as "reserved" on some 83xx, on the 83xx parts that /do/
> implement it.  So instead of having a mask, perhaps setting absolute
> values for CONFIG_SYS_LCRR should be replaced with a better scheme that
> allows board configs to just set LCRR bits by field, such as what the
> SCCR setting code does.  I.e, deprecate CONFIG_SYS_LCRR and replace with
> individually-specified CONFIG_SYS_LCRR_{CLKDIV,EADC,ECL,BUDCMDC,DBYP}
> values.
>
> This will allow the reserved bits, whether 1 on reset or
> not, to be preserved across all 83xx (and 85xx for that matter).

Hm, you mean like the SCCR stuff in mpc83xx/cpu_init.c?  Please don't.

This code is plain ugly - and even more, as I have pointed out multiple
times, in not more than 50 lines there are "only" 1024 non-trivially
differing c input possibilities coded.  This is what I call bad.

Thinking about it, why not do a compromise like e.g. the following:

u32 sccr_mask = 0 \
#ifdef CONFIG_SYS_SCCR_ENCCM
                | SCCR_ENCCM \
#endif
#ifdef CONFIG_SYS_SCCR_PCICM
                | SCCR_PCICM \
#endif
....
#endif
                ;

u32 sccr_value = 0 \
#ifdef CONFIG_SYS_SCCR_ENCCM
                | CONFIG_SYS_SCCR_ENCCM \
#endif
#ifdef CONFIG_SYS_SCCR_PCICM
                | CONFIG_SYS_SCCR_PCICM \
#endif
....
#endif
                ;

out_be32(&im->clk.sccr, i(n_be32(&im->clk.sccr) & ~sccr_mask) | sccr_value);

This not only looks a bit nicer, but also (I hope) compiles the *exact*
same code for all possibilites, only with changing data values.

Cheers
  Detlev

-- 
Or go for generality ... Add a programming language for extensibility
and write part of the program in that language.
                                    --- GNU Coding Standards
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de

[U-Boot] [PATCH v2] mpc83xx: update LCRR register handling

[Wolfgang Denk]

Dear Detlev Zundel,

In message <m2tyzsw7hr.fsf@ohwell.denx.de> you wrote:
> 
> > I think we should allow board-configurable writes to the DBYP bit, which
> > is documented as "reserved" on some 83xx, on the 83xx parts that /do/
> > implement it.  So instead of having a mask, perhaps setting absolute
> > values for CONFIG_SYS_LCRR should be replaced with a better scheme that
> > allows board configs to just set LCRR bits by field, such as what the
> > SCCR setting code does.  I.e, deprecate CONFIG_SYS_LCRR and replace with
> > individually-specified CONFIG_SYS_LCRR_{CLKDIV,EADC,ECL,BUDCMDC,DBYP}
> > values.
> >
> > This will allow the reserved bits, whether 1 on reset or
> > not, to be preserved across all 83xx (and 85xx for that matter).
> 
> Hm, you mean like the SCCR stuff in mpc83xx/cpu_init.c?  Please don't.
> 
> This code is plain ugly - and even more, as I have pointed out multiple
> times, in not more than 50 lines there are "only" 1024 non-trivially
> differing c input possibilities coded.  This is what I call bad.

Agreed.

Kim, the code in mpc83xx/cpu_init.c is *really* ugly.

I hereby suggest that this should be cleaned up ASAP.

> Thinking about it, why not do a compromise like e.g. the following:

Hm... I don't like the need for duplicated "#ifdef" lists, but don;t
know of a better way to write it either.

> out_be32(&im->clk.sccr, i(n_be32(&im->clk.sccr) & ~sccr_mask) | sccr_value);

Or rather:

	clrsetbits_be32(&im->clk.sccr, sccr_mask, sccr_value);


> This not only looks a bit nicer, but also (I hope) compiles the *exact*
> same code for all possibilites, only with changing data values.

Agreed.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
You got to learn three things. What's  real,  what's  not  real,  and
what's the difference."           - Terry Pratchett, _Witches Abroad_

[U-Boot] [PATCH v2] mpc83xx: update LCRR register handling

[Kim Phillips]

On Fri, 28 Aug 2009 14:02:15 +0200
Wolfgang Denk <wd@denx.de> wrote:

> Dear Detlev Zundel,
> 
> In message <m2tyzsw7hr.fsf@ohwell.denx.de> you wrote:
> > 
> > > I think we should allow board-configurable writes to the DBYP bit, which
> > > is documented as "reserved" on some 83xx, on the 83xx parts that /do/
> > > implement it.  So instead of having a mask, perhaps setting absolute
> > > values for CONFIG_SYS_LCRR should be replaced with a better scheme that
> > > allows board configs to just set LCRR bits by field, such as what the
> > > SCCR setting code does.  I.e, deprecate CONFIG_SYS_LCRR and replace with
> > > individually-specified CONFIG_SYS_LCRR_{CLKDIV,EADC,ECL,BUDCMDC,DBYP}
> > > values.
> > >
> > > This will allow the reserved bits, whether 1 on reset or
> > > not, to be preserved across all 83xx (and 85xx for that matter).
> > 
> > Hm, you mean like the SCCR stuff in mpc83xx/cpu_init.c?  Please don't.
> > 
> > This code is plain ugly - and even more, as I have pointed out multiple
> > times, in not more than 50 lines there are "only" 1024 non-trivially
> > differing c input possibilities coded.  This is what I call bad.
> 
> Agreed.
> 
> Kim, the code in mpc83xx/cpu_init.c is *really* ugly.
> 
> I hereby suggest that this should be cleaned up ASAP.
> 
> > Thinking about it, why not do a compromise like e.g. the following:
> 
> Hm... I don't like the need for duplicated "#ifdef" lists, but don;t
> know of a better way to write it either.
> 
> > out_be32(&im->clk.sccr, i(n_be32(&im->clk.sccr) & ~sccr_mask) | sccr_value);
> 
> Or rather:
> 
> 	clrsetbits_be32(&im->clk.sccr, sccr_mask, sccr_value);
> 
> 
> > This not only looks a bit nicer, but also (I hope) compiles the *exact*
> > same code for all possibilites, only with changing data values.
> 
> Agreed.

agreed, I was already thinking of ways of rewriting the ugly SCCR code,
but you beat me to it.

I'll try and get something out this weekend.

Kim