[U-Boot] [PATCH 3/4] arm, davinci: Add function lpsc_syncreset()
Christian Riesch
christian.riesch at omicron.at
Wed Oct 12 13:31:19 CEST 2011
This patch adds a function lpsc_syncreset that allows setting a
lpsc module into Sync Reset state.
Signed-off-by: Christian Riesch <christian.riesch at omicron.at>
Cc: Heiko Schocher <hs at denx.de>
Cc: Paulraj Sandeep <s-paulraj at ti.com>
Cc: Albert ARIBAUD <albert.u.boot at aribaud.net>
---
arch/arm/cpu/arm926ejs/davinci/psc.c | 20 +++++++++++++++-----
arch/arm/include/asm/arch-davinci/hardware.h | 1 +
2 files changed, 16 insertions(+), 5 deletions(-)
diff --git a/arch/arm/cpu/arm926ejs/davinci/psc.c b/arch/arm/cpu/arm926ejs/davinci/psc.c
index 486adb0..e02d1f6 100644
--- a/arch/arm/cpu/arm926ejs/davinci/psc.c
+++ b/arch/arm/cpu/arm926ejs/davinci/psc.c
@@ -46,7 +46,7 @@
*/
/* Works on Always On power domain only (no PD argument) */
-void lpsc_on(unsigned int id)
+static void lpsc_transition(unsigned int id, unsigned int state)
{
dv_reg_p mdstat, mdctl, ptstat, ptcmd;
#ifdef CONFIG_SOC_DA8XX
@@ -83,10 +83,10 @@ void lpsc_on(unsigned int id)
while (readl(ptstat) & 0x01)
continue;
- if ((readl(mdstat) & 0x3f) == 0x03)
- return; /* Already on and enabled */
+ if ((readl(mdstat) & 0x3f) == state)
+ return; /* Already in that state */
- writel(readl(mdctl) | 0x03, mdctl);
+ writel((readl(mdctl) & ~0x1f) | state, mdctl);
switch (id) {
#ifdef CONFIG_SOC_DM644X
@@ -114,10 +114,20 @@ void lpsc_on(unsigned int id)
while (readl(ptstat) & 0x01)
continue;
- while ((readl(mdstat) & 0x3f) != 0x03)
+ while ((readl(mdstat) & 0x3f) != state)
continue;
}
+void lpsc_on(unsigned int id)
+{
+ lpsc_transition(id, 0x03);
+}
+
+void lpsc_syncreset(unsigned int id)
+{
+ lpsc_transition(id, 0x01);
+}
+
/* Not all DaVinci chips have a DSP power domain. */
#ifdef CONFIG_SOC_DM644X
diff --git a/arch/arm/include/asm/arch-davinci/hardware.h b/arch/arm/include/asm/arch-davinci/hardware.h
index 24ae49d..c87e944 100644
--- a/arch/arm/include/asm/arch-davinci/hardware.h
+++ b/arch/arm/include/asm/arch-davinci/hardware.h
@@ -291,6 +291,7 @@ typedef volatile unsigned int * dv_reg_p;
#endif /* CONFIG_SOC_DA8XX */
void lpsc_on(unsigned int id);
+void lpsc_syncreset(unsigned int id);
void dsp_on(void);
void davinci_enable_uart0(void);
--
1.7.0.4
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