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authorDirk Behme <dirk.behme@de.bosch.com>2012-05-02 02:12:17 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-05-15 08:31:33 +0200
commitcac833a98cf7e111bd07b15fe59ef85fca1c46e7 (patch)
tree8f625d41c2ef50f3b5395da5b2c53aa1a89c7b6d
parentecb7be2985e130d1d3f7569f086cf50bfe60d337 (diff)
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i.MX6: Add ANATOP regulator init
Init the core regulator voltage to 1.2V. This is required for the correct functioning of the GPU and when the ARM LDO is set to 1.225V. This is a workaround to fix some memory clock jitter. Note: This should be but can't be done in the DCD. The bootloader prevents access to the ANATOP registers. Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> CC: Jason Chen <b02280@freescale.com> CC: Jason Liu <r64343@freescale.com> CC: Ranjani Vaidyanathan <ra5478@freescale.com> CC: Stefano Babic <sbabic@denx.de> CC: Fabio Estevam <festevam@gmail.com>
-rw-r--r--arch/arm/cpu/armv7/mx6/soc.c30
-rw-r--r--arch/arm/include/asm/arch-mx6/sys_proto.h2
2 files changed, 32 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
index 543b2cc..90f2088 100644
--- a/arch/arm/cpu/armv7/mx6/soc.c
+++ b/arch/arm/cpu/armv7/mx6/soc.c
@@ -77,10 +77,40 @@ void init_aips(void)
writel(0x00000000, &aips2->opacr4);
}
+/*
+ * Set the VDDSOC
+ *
+ * Mask out the REG_CORE[22:18] bits (REG2_TRIG) and set
+ * them to the specified millivolt level.
+ * Possible values are from 0.725V to 1.450V in steps of
+ * 0.025V (25mV).
+ */
+void set_vddsoc(u32 mv)
+{
+ struct anatop_regs *anatop = (struct anatop_regs *)ANATOP_BASE_ADDR;
+ u32 val, reg = readl(&anatop->reg_core);
+
+ if (mv < 725)
+ val = 0x00; /* Power gated off */
+ else if (mv > 1450)
+ val = 0x1F; /* Power FET switched full on. No regulation */
+ else
+ val = (mv - 700) / 25;
+
+ /*
+ * Mask out the REG_CORE[22:18] bits (REG2_TRIG)
+ * and set them to the calculated value (0.7V + val * 0.25V)
+ */
+ reg = (reg & ~(0x1F << 18)) | (val << 18);
+ writel(reg, &anatop->reg_core);
+}
+
int arch_cpu_init(void)
{
init_aips();
+ set_vddsoc(1200); /* Set VDDSOC to 1.2V */
+
return 0;
}
#endif
diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h b/arch/arm/include/asm/arch-mx6/sys_proto.h
index 69687a8..711b30d 100644
--- a/arch/arm/include/asm/arch-mx6/sys_proto.h
+++ b/arch/arm/include/asm/arch-mx6/sys_proto.h
@@ -28,6 +28,8 @@
u32 get_cpu_rev(void);
+void set_vddsoc(u32 mv);
+
/*
* Initializes on-chip ethernet controllers.
* to override, implement board_eth_init()