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arm, davinci: Add function lpsc_syncreset() 

This patch adds a function lpsc_syncreset that allows setting a
lpsc module into Sync Reset state.

Signed-off-by: Christian Riesch <christian.riesch@omicron.at>
Cc: Heiko Schocher <hs@denx.de>
Cc: Paulraj Sandeep <s-paulraj@ti.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Acked-by: Heiko Schocher <hs@denx.de>
Tested-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
This commit is contained in:
Christian Riesch 2011-10-12 21:26:43 +00:00 committed by Albert ARIBAUD
parent eb40d05fcc
commit fab19c142e
2 changed files with 17 additions and 5 deletions
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20
arch/arm/cpu/arm926ejs/davinci/psc.c
View File

@ -46,7 +46,7 @@
*/ */
/* Works on Always On power domain only (no PD argument) */ /* 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; dv_reg_p mdstat, mdctl, ptstat, ptcmd;
#ifdef CONFIG_SOC_DA8XX #ifdef CONFIG_SOC_DA8XX
@ -83,10 +83,10 @@ void lpsc_on(unsigned int id)
while (readl(ptstat) & 0x01) while (readl(ptstat) & 0x01)
continue; continue;
if ((readl(mdstat) & PSC_MDSTAT_STATE) == 0x03) if ((readl(mdstat) & PSC_MDSTAT_STATE) == state)
return; /* Already on and enabled */ return; /* Already in that state */
writel(readl(mdctl) | 0x03, mdctl); writel((readl(mdctl) & ~PSC_MDCTL_NEXT) | state, mdctl);
switch (id) { switch (id) {
#ifdef CONFIG_SOC_DM644X #ifdef CONFIG_SOC_DM644X
@ -114,10 +114,20 @@ void lpsc_on(unsigned int id)
while (readl(ptstat) & 0x01) while (readl(ptstat) & 0x01)
continue; continue;
while ((readl(mdstat) & PSC_MDSTAT_STATE) != 0x03) while ((readl(mdstat) & PSC_MDSTAT_STATE) != state)
continue; 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. */ /* Not all DaVinci chips have a DSP power domain. */
#ifdef CONFIG_SOC_DM644X #ifdef CONFIG_SOC_DM644X

2
arch/arm/include/asm/arch-davinci/hardware.h
View File

@ -292,6 +292,7 @@ typedef volatile unsigned int * dv_reg_p;
#endif /* CONFIG_SOC_DA8XX */ #endif /* CONFIG_SOC_DA8XX */
void lpsc_on(unsigned int id); void lpsc_on(unsigned int id);
void lpsc_syncreset(unsigned int id);
void dsp_on(void); void dsp_on(void);
void davinci_enable_uart0(void); void davinci_enable_uart0(void);
@ -358,6 +359,7 @@ struct davinci_psc_regs {
#endif /* CONFIG_SOC_DA8XX */ #endif /* CONFIG_SOC_DA8XX */
#define PSC_MDSTAT_STATE 0x3f #define PSC_MDSTAT_STATE 0x3f
#define PSC_MDCTL_NEXT 0x07
#ifndef CONFIG_SOC_DA8XX #ifndef CONFIG_SOC_DA8XX