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Davinci: support LPSC SwRstDisable state 

The current clock control code always gates the clock (PSC state Disable = 2)
on clk_disable().  Some on-chip peripherals (e.g. LCD controller on TNETV107X)
need to be put into SwRstDisable = 0 on clock disable, to maintain
hardware sanity.

This patch extends the davinci_psc_config() arguments to pass in the desired
module state instead of a boolean enable/disable.  Further, clk_disable() now
checks for the PSC_SWRSTDISABLE clk flag before selecting the target state.

Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Cyril Chemparathy 2010-03-25 17:43:47 -04:00 committed by Kevin Hilman
parent 449ef7f6a9
commit 52958be3ad
4 changed files with 21 additions and 9 deletions
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12
arch/arm/mach-davinci/clock.c
View File

@ -43,7 +43,8 @@ static void __clk_enable(struct clk *clk)
if (clk->parent)
__clk_enable(clk->parent);
if (clk->usecount++ == 0 && (clk->flags & CLK_PSC))
davinci_psc_config(psc_domain(clk), clk->gpsc, clk->lpsc, 1);
davinci_psc_config(psc_domain(clk), clk->gpsc, clk->lpsc,
PSC_STATE_ENABLE);
}
static void __clk_disable(struct clk *clk)
@ -52,7 +53,9 @@ static void __clk_disable(struct clk *clk)
return;
if (--clk->usecount == 0 && !(clk->flags & CLK_PLL) &&
(clk->flags & CLK_PSC))
davinci_psc_config(psc_domain(clk), clk->gpsc, clk->lpsc, 0);
davinci_psc_config(psc_domain(clk), clk->gpsc, clk->lpsc,
(clk->flags & PSC_SWRSTDISABLE) ?
PSC_STATE_SWRSTDISABLE : PSC_STATE_DISABLE);
if (clk->parent)
__clk_disable(clk->parent);
}
@ -234,7 +237,10 @@ static int __init clk_disable_unused(void)
continue;
pr_info("Clocks: disable unused %s\n", ck->name);
davinci_psc_config(psc_domain(ck), ck->gpsc, ck->lpsc, 0);
davinci_psc_config(psc_domain(ck), ck->gpsc, ck->lpsc,
(ck->flags & PSC_SWRSTDISABLE) ?
PSC_STATE_SWRSTDISABLE : PSC_STATE_DISABLE);
}
spin_unlock_irq(&clockfw_lock);

7
arch/arm/mach-davinci/clock.h
View File

@ -101,10 +101,11 @@ struct clk {
/* Clock flags: SoC-specific flags start at BIT(16) */
#define ALWAYS_ENABLED BIT(1)
#define CLK_PSC BIT(2)
#define PSC_DSP BIT(3) /* PSC uses DSP domain, not ARM */
#define CLK_PSC BIT(2)
#define PSC_DSP BIT(3) /* PSC uses DSP domain, not ARM */
#define CLK_PLL BIT(4) /* PLL-derived clock */
#define PRE_PLL BIT(5) /* source is before PLL mult/div */
#define PRE_PLL BIT(5) /* source is before PLL mult/div */
#define PSC_SWRSTDISABLE BIT(6) /* Disable state is SwRstDisable */
#define CLK(dev, con, ck) \
{ \

8
arch/arm/mach-davinci/include/mach/psc.h
View File

@ -189,13 +189,19 @@
#define MDSTAT 0x800
#define MDCTL 0xA00
/* PSC module states */
#define PSC_STATE_SWRSTDISABLE 0
#define PSC_STATE_SYNCRST 1
#define PSC_STATE_DISABLE 2
#define PSC_STATE_ENABLE 3
#define MDSTAT_STATE_MASK 0x1f
#ifndef __ASSEMBLER__
extern int davinci_psc_is_clk_active(unsigned int ctlr, unsigned int id);
extern void davinci_psc_config(unsigned int domain, unsigned int ctlr,
unsigned int id, char enable);
unsigned int id, u32 next_state);
#endif

3
arch/arm/mach-davinci/psc.c
View File

@ -47,12 +47,11 @@ int __init davinci_psc_is_clk_active(unsigned int ctlr, unsigned int id)
/* Enable or disable a PSC domain */
void davinci_psc_config(unsigned int domain, unsigned int ctlr,
unsigned int id, char enable)
unsigned int id, u32 next_state)
{
u32 epcpr, ptcmd, ptstat, pdstat, pdctl1, mdstat, mdctl;
void __iomem *psc_base;
struct davinci_soc_info *soc_info = &davinci_soc_info;
u32 next_state = enable ? 0x3 : 0x2; /* 0x3 enables, 0x2 disables */
if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
pr_warning("PSC: Bad psc data: 0x%x[%d]\n",