Tony Lindgren had written, on 10/09/2009 01:03 PM, the following:
* Aguirre Rodriguez, Sergio Alberto <saaguirre@xxxxxx> [091009 08:59]:
-----Original Message-----
From: Menon, Nishanth
Sent: Friday, October 09, 2009 10:56 AM
To: linux-omap
Cc: Menon, Nishanth; Chikkature Rajashekar, Madhusudhan;
Pandita, Vikram; Pais, Allen; Gadiyar, Anand; Cousson,
Benoit; Felipe Balbi; Kevin Hilman; Premi, Sanjeev;
Shilimkar, Santosh; Aguirre Rodriguez, Sergio Alberto; Tony Lindgren
Subject: [PATCH v4] OMAP3: introduce OMAP3630
**--- SNIP ME --
Hi,
A bit of history for this patchset
V4 - Sergio's improvement to the handling of rev decision as we just
change the define to 3630 and remove crapy override logic in
omap3_check_revision from v3 patch
Now looks much better ;)
V3 - Fixes from Sergio's comments + boot tested on SDP3430+3630.
V2 - fixes of generic comments from Felipe Balbi+minor cleanups
V1 - inital implementation of (a) approach
V0 - original approach introducing a new silicon family
**--- END OF SNIP ME --
Device intro:
OMAP3630 is the latest in the family of OMAP3 devices
and among the changes it introduces are:
New OPP levels for new voltage and frequency levels. a bunch of
Bug fixes to various modules feature additions, notably with ISP,
sDMA etc.
Details about the chip is available here:
http://focus.ti.com/general/docs/wtbu/wtbuproductcontent.tsp?t
emplateId=6123&navigationId=12836&contentId=52606
Strategy used:
Strategy to introduce this device into Linux was discussed here:
Ref: http://marc.info/?t=125343303400003&r=1&w=2
Two approaches were available:
a) Consider 3630 generation of devices as a new family of silicon
b) Consider 3630 as an offshoot of 3430 family of devices
As a common consensus, (b) seems to be more valid for 3630 as:
* There are changes which are easily handled by using "FEATURES"
infrastructure.
For details how to do this, see thread:
http://marc.info/?t=125050998500001&r=1&w=2
* Most of existing 34xx infrastructure can be reused(almost 90%+)
- so no ugly if (cpu_is_omap34xx() || cpu_is_omap36xx())
all over the place
- lesser chance of bugs due to reuse of proven code flow
- 36xx specific handling can still be done where required
within the existing infrastructure
NOTE:
* If additional 34xx series are added, OMAP3430_REV_ESXXXX can be
added on top of the existing 3630 ones are renumbered
This patch was tested on SDP3430, boot tested on 3630 platform using
3430sdp defconfig
Signed-off-by: Madhusudhan Chikkature Rajashekar <madhu.cr@xxxxxx>
Signed-off-by: Nishanth Menon <nm@xxxxxx>
Signed-off-by: Vikram Pandita <vikram.pandita@xxxxxx>
Cc: Allen Pais <allen.pais@xxxxxx>
Cc: Anand Gadiyar <gadiyar@xxxxxx>
Cc: Benoit Cousson <b-cousson@xxxxxx>
Cc: Felipe Balbi <felipe.balbi@xxxxxxxxx>
Cc: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx>
Cc: Sanjeev Premi <premi@xxxxxx>
Cc: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Cc: Sergio Alberto Aguirre Rodriguez <saaguirre@xxxxxx>
Cc: Tony Lindgren <tony@xxxxxxxxxxx>
Acked-by: Sergio Aguirre <saaguirre@xxxxxx>
---
arch/arm/mach-omap2/id.c | 24 ++++++++++++++++++++++--
arch/arm/plat-omap/include/mach/cpu.h | 6 ++++++
2 files changed, 28 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index 03b80f2..ee3bb69 100644
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c
@@ -210,7 +210,9 @@ void __init omap3_check_revision(void)
hawkeye = (idcode >> 12) & 0xffff;
rev = (idcode >> 28) & 0xff;
- if (hawkeye == 0xb7ae) {
+ switch (hawkeye) {
+ case 0xb7ae:
+ /* Handle 34xx devices */
switch (rev) {
case 0:
omap_revision = OMAP3430_REV_ES2_0;
@@ -231,8 +233,26 @@ void __init omap3_check_revision(void)
default:
/* Use the latest known revision as default */
omap_revision = OMAP3430_REV_ES3_1;
- rev_name = "Unknown revision\n";
+ rev_name = "Unknown 34xx revision\n";
}
+ break;
+ case 0xb891:
+ /* Handle 36xx devices */
+ switch (rev) {
+ case 0:
+ omap_revision = OMAP3630_REV_ES1_0;
+ rev_name = "ES1.0";
+ break;
+ default:
+ /* Use the latest known revision as default */
+ omap_revision = OMAP3630_REV_ES1_0;
+ rev_name = "Unknown 36xx revision\n";
+ }
+ break;
+ default:
+ /* Unknown default to latest rev as default*/
+ omap_revision = OMAP3630_REV_ES1_0;
+ rev_name = "Unknown revision\n";
}
out:
diff --git a/arch/arm/plat-omap/include/mach/cpu.h
b/arch/arm/plat-omap/include/mach/cpu.h
index 431fec4..65f1882 100644
--- a/arch/arm/plat-omap/include/mach/cpu.h
+++ b/arch/arm/plat-omap/include/mach/cpu.h
@@ -383,6 +383,12 @@ IS_OMAP_TYPE(3430, 0x3430)
#define OMAP3430_REV_ES2_1 0x34302034
#define OMAP3430_REV_ES3_0 0x34303034
#define OMAP3430_REV_ES3_1 0x34304034
+/* NOTE: Add 36xx series below
+ * If additional 34xx series are added, OMAP3430_REV_ESXXXX can be
+ * added above the 3630 defines and series renumbered to ensure
+ * rev() > checks to work
+ */
+#define OMAP3630_REV_ES1_0 0x36301034
Hmm, to me it looks that this breaks cpu_is_omap34xx() for 36xx, right?
How about build a kernel that boots both on 3430sdp and on some
36xx board and make sure things get detected properly by adding
some debug printk statements?
Tested with the following patch:
diff --git a/arch/arm/mach-omap2/board-3430sdp.c
b/arch/arm/mach-omap2/board-3430sdp.c
index 81aabac..2aac26d 100644
--- a/arch/arm/mach-omap2/board-3430sdp.c
+++ b/arch/arm/mach-omap2/board-3430sdp.c
@@ -498,6 +498,8 @@ static struct ehci_hcd_omap_platform_data ehci_pdata
__initconst = {
static void __init omap_3430sdp_init(void)
{
+ if (cpu_is_omap34xx())
+ printk(KERN_ERR "_______________------ 34xx detected\n");
omap3430_i2c_init();
platform_add_devices(sdp3430_devices, ARRAY_SIZE(sdp3430_devices));
if (omap_rev() > OMAP3430_REV_ES1_0)
and yes, it prints on both 3430 and 3630 platforms (i am hacking at the
moment by using 3430sdpdefconfig for both platforms).
Here is why it works:
arch/arm/plat-omap/include/mach/cpu.h
cpu_is_omap343x() depends on is_omap34xx() depends on GET_OMAP_CLASS
depends on lower 8 bits of value returned by omap_rev()
omap_rev()(arch/arm/mach-omap2/id.c) returns omap_revision. this means
omap_rev() will return 0x36301034 -> so class is 0x34.. causing
cpu_is_omap343x to be true on 3630 also.
we might want to consider a follow on patch replacing 0x34 with 0x30 and
changing cpu_is_omap343x with cpu_is_omap3xxx -> at a later point ofcourse.
--
Regards,
Nishanth Menon
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