ARM: at91: spl: Adjust switching to oscillator for SAMA5D2

[people/ms/u-boot.git] / arch / arm / mach-at91 / spl_atmel.c

diff --git a/arch/arm/mach-at91/spl_atmel.c b/arch/arm/mach-at91/spl_atmel.c
index b75c2ccefdc2a029dec8fceb243b3fb81679fa0a..ce16ef3bdb71eb376e7db24847fbd876ea6eed29 100644 (file)
--- a/arch/arm/mach-at91/spl_atmel.c
+++ b/arch/arm/mach-at91/spl_atmel.c
@@ -32,6 +32,20 @@ static void switch_to_main_crystal_osc(void)
        while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCS))
                ;
 
+#if defined(CONFIG_SAMA5D2)
+       /* Enable a measurement of the external oscillator */
+       tmp = readl(&pmc->mcfr);
+       tmp |= AT91_PMC_MCFR_CCSS_XTAL_OSC;
+       tmp |= AT91_PMC_MCFR_RCMEAS;
+       writel(tmp, &pmc->mcfr);
+
+       while (!(readl(&pmc->mcfr) & AT91_PMC_MCFR_MAINRDY))
+               ;
+
+       if (!(readl(&pmc->mcfr) & AT91_PMC_MCFR_MAINF_MASK))
+               hang();
+#endif
+
        tmp = readl(&pmc->mor);
        tmp &= ~AT91_PMC_MOR_OSCBYPASS;
        tmp &= ~AT91_PMC_MOR_KEY(0xff);
@@ -47,11 +61,13 @@ static void switch_to_main_crystal_osc(void)
        while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCSELS))
                ;
 
+#if !defined(CONFIG_SAMA5D2)
        /* Wait until MAINRDY field is set to make sure main clock is stable */
        while (!(readl(&pmc->mcfr) & AT91_PMC_MAINRDY))
                ;
+#endif
 
-#ifndef CONFIG_SAMA5D4
+#if !defined(CONFIG_SAMA5D4) && !defined(CONFIG_SAMA5D2)
        tmp = readl(&pmc->mor);
        tmp &= ~AT91_PMC_MOR_MOSCRCEN;
        tmp &= ~AT91_PMC_MOR_KEY(0xff);