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authorMike Turquette <mturquette@ti.com>2011-10-07 00:52:58 -0600
committerPaul Walmsley <paul@pwsan.com>2011-10-07 00:52:58 -0600
commita1900f2efe2d75e0fe5b871421a2f2de2fa68b4e (patch)
treeec96f1f2a34d81bc0fa561d3ff404fbd9059531d /arch/arm/mach-omap2/clock44xx.h
parentbe73246058737beec52ae232bcab7776332a9e06 (diff)
ARM: OMAP4: clock: round_rate and recalc functions for DPLL_ABE
OMAP4 DPLL_ABE can enable a 4X multipler on top of the normal MN multipler and divider. This is achieved by setting CM_CLKMODE_DPLL_ABE.DPLL_REGM4XEN bit in CKGEN module of CM1. From the OMAP4 TRM: Fdpll = Fref x 2 x (4 x M/(N+1)) in case REGM4XEN bit field is set (only applicable to DPLL_ABE). Add new round_rate() and recalc() functions for OMAP4, that check the setting of REGM4XEN bit and handle this appropriately. The new functions are a simple wrapper on top of the existing omap2_dpll_round_rate() and omap2_dpll_get_rate() functions to handle the REGM4XEN bit. The REGM4XEN bit is only implemented for the ABE DPLL on OMAP4 and so only dpll_abe_ck uses omap4_dpll_regm4xen_round_rate() and omap4_dpll_regm4xen_recalc() functions. Signed-off-by: Mike Turquette <mturquette@ti.com> Tested-by: Jon Hunter <jon-hunter@ti.com> Signed-off-by: Jon Hunter <jon-hunter@ti.com> [paul@pwsan.com: fixed attempt to return a negative from a fn returning unsigned; pass along errors from omap2_dpll_round_rate(); added documentation; added Jon's S-o-b] Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch/arm/mach-omap2/clock44xx.h')
-rw-r--r--arch/arm/mach-omap2/clock44xx.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/clock44xx.h b/arch/arm/mach-omap2/clock44xx.h
index 7ceb870e7ab..287a46f78d9 100644
--- a/arch/arm/mach-omap2/clock44xx.h
+++ b/arch/arm/mach-omap2/clock44xx.h
@@ -8,6 +8,13 @@
#ifndef __ARCH_ARM_MACH_OMAP2_CLOCK44XX_H
#define __ARCH_ARM_MACH_OMAP2_CLOCK44XX_H
+/*
+ * OMAP4430_REGM4XEN_MULT: If the CM_CLKMODE_DPLL_ABE.DPLL_REGM4XEN bit is
+ * set, then the DPLL's lock frequency is multiplied by 4 (OMAP4430 TRM
+ * vV Section 3.6.3.3.1 "DPLLs Output Clocks Parameters")
+ */
+#define OMAP4430_REGM4XEN_MULT 4
+
int omap4xxx_clk_init(void);
#endif