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authorNishant Kamat <nskamat@ti.com>2011-02-17 20:55:03 +0300
committerTony Lindgren <tony@atomide.com>2011-02-18 03:16:35 +0300
commite49c4d27ab5ffd0d8707685af9ca2866a95660e8 (patch)
treedf4da67d456cfe06f49eec70c86b8cf7e4a28d50 /arch/arm/mach-omap2/id.c
parent59556765cd30467ff64a391906ad8eb68f886ad3 (diff)
downloadlinux-e49c4d27ab5ffd0d8707685af9ca2866a95660e8.tar.xz
omap: Add chip id recognition for OMAP4 ES2.1 and ES2.2
Allow OMAP4 ES2.1 and ES2.2 revisions to be recognized in the omap4_check_revision() function. Mainly, ES2.1 has fixes that allow LPDDR to be used at 100% OPP (400MHz). ES2.2 additionally has a couple of power management fixes (to reduce leakage), an I2C1 SDA line state fix, and a floating point write corruption fix (cortex erratum). Even though the current mainline support doesn't need to distinguish between ES2.X versions, it's still useful to know the correct silicon rev when issues are reported. Moreover, these id checks can be used by power management code that selects suitable OPPs considering the memory speed limitation on ES2.0. For details about the silicon errata on OMAP4430, refer http://focus.ti.com/pdfs/wtbu/SWPZ009A_OMAP4430_Errata_Public_vA.pdf Signed-off-by: Nishant Kamat <nskamat@ti.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/mach-omap2/id.c')
-rw-r--r--arch/arm/mach-omap2/id.c31
1 files changed, 20 insertions, 11 deletions
diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index 5c25f1b55235..3168b17bc264 100644
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c
@@ -6,7 +6,7 @@
* Copyright (C) 2005 Nokia Corporation
* Written by Tony Lindgren <tony@atomide.com>
*
- * Copyright (C) 2009 Texas Instruments
+ * Copyright (C) 2009-11 Texas Instruments
* Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
*
* This program is free software; you can redistribute it and/or modify
@@ -328,7 +328,7 @@ static void __init omap4_check_revision(void)
*/
idcode = read_tap_reg(OMAP_TAP_IDCODE);
hawkeye = (idcode >> 12) & 0xffff;
- rev = (idcode >> 28) & 0xff;
+ rev = (idcode >> 28) & 0xf;
/*
* Few initial ES2.0 samples IDCODE is same as ES1.0
@@ -347,22 +347,31 @@ static void __init omap4_check_revision(void)
omap_chip.oc |= CHIP_IS_OMAP4430ES1;
break;
case 1:
+ default:
omap_revision = OMAP4430_REV_ES2_0;
omap_chip.oc |= CHIP_IS_OMAP4430ES2;
+ }
+ break;
+ case 0xb95c:
+ switch (rev) {
+ case 3:
+ omap_revision = OMAP4430_REV_ES2_1;
+ omap_chip.oc |= CHIP_IS_OMAP4430ES2_1;
break;
+ case 4:
default:
- omap_revision = OMAP4430_REV_ES2_0;
- omap_chip.oc |= CHIP_IS_OMAP4430ES2;
- }
- break;
+ omap_revision = OMAP4430_REV_ES2_2;
+ omap_chip.oc |= CHIP_IS_OMAP4430ES2_2;
+ }
+ break;
default:
- /* Unknown default to latest silicon rev as default*/
- omap_revision = OMAP4430_REV_ES2_0;
- omap_chip.oc |= CHIP_IS_OMAP4430ES2;
+ /* Unknown default to latest silicon rev as default */
+ omap_revision = OMAP4430_REV_ES2_2;
+ omap_chip.oc |= CHIP_IS_OMAP4430ES2_2;
}
- pr_info("OMAP%04x ES%d.0\n",
- omap_rev() >> 16, ((omap_rev() >> 12) & 0xf) + 1);
+ pr_info("OMAP%04x ES%d.%d\n", omap_rev() >> 16,
+ ((omap_rev() >> 12) & 0xf), ((omap_rev() >> 8) & 0xf));
}
#define OMAP3_SHOW_FEATURE(feat) \