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arm, davinci: add PLL0 prediv to da850 lowlevel setup 

The OMAP-L138 has a pre-divider available on PLL0.

Add support to da850_lowlevel.c for configuring PLL0's pre-divider. This is
to achieve certain OPP's -- e.g. the 372MHz OPP used also by Linux.

Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca>
Cc: Christian Riesch <christian.riesch@omicron.at>
CC: Heiko Schocher <hs@denx.de>
Cc: Sandeep Paulraj <s-paulraj@ti.com>
Cc: Tom Rini <tom.rini@gmail.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Acked-by: Heiko Schocher <hs@denx.de>
Acked-by: Christian Riesch <christian.riesch@omicron.at>
This commit is contained in:
Ben Gardiner 2012-01-16 07:43:15 +00:00 committed by Albert ARIBAUD
parent bd29cb05f2
commit d652a344a0
2 changed files with 9 additions and 1 deletions
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7
arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c
View File

@ -85,6 +85,13 @@ int da850_pll_init(struct davinci_pllc_regs *reg, unsigned long pllmult)
/* Enable the PLL from Disable Mode PLLDIS bit to 0 */
clrbits_le32(&reg->pllctl, PLLCTL_PLLDIS);
#if defined(CONFIG_SYS_DA850_PLL0_PREDIV)
/* program the prediv */
if (reg == davinci_pllc0_regs && CONFIG_SYS_DA850_PLL0_PREDIV)
writel((PLL_DIVEN | CONFIG_SYS_DA850_PLL0_PREDIV),
&reg->prediv);
#endif
/* Program the required multiplier value in PLLM */
writel(pllmult, &reg->pllm);

3
arch/arm/include/asm/arch-davinci/pll_defs.h
View File

@ -68,7 +68,8 @@ struct dv_pll_regs {
#define PLLCTL_RES_9 (1 << 8)
#define PLLCTL_EXTCLKSRC (1 << 9)
#define PLL_POSTDEN (1 << 15)
#define PLL_DIVEN (1 << 15)
#define PLL_POSTDEN PLL_DIVEN
#define PLL_SCSCFG3_DIV45PENA (1 << 2)
#define PLL_SCSCFG3_EMA_CLKSRC (1 << 1)