From c735c40587cea45f9d2f83339f374595073c1923 Mon Sep 17 00:00:00 2001 From: Juergen Beisert Date: Mon, 16 Aug 2010 15:54:07 +0200 Subject: [PATCH] clock-imx35: Calculate the base clock rate for the IPU unit The mx3fb driver needs the clock the IPU runs in order to calculate the divider for the LCD clock. This patch adds the clock rate calculation routine for the i.MX35 CPU. Signed-off-by: Juergen Beisert Signed-off-by: Michael Grzeschik Signed-off-by: Sascha Hauer --- arch/arm/mach-mx3/clock-imx35.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/arch/arm/mach-mx3/clock-imx35.c b/arch/arm/mach-mx3/clock-imx35.c index 1d311b77b40..7a62e744a8b 100644 --- a/arch/arm/mach-mx3/clock-imx35.c +++ b/arch/arm/mach-mx3/clock-imx35.c @@ -296,6 +296,33 @@ static unsigned long get_rate_ipg_per(struct clk *clk) } } +static unsigned long get_rate_hsp(struct clk *clk) +{ + unsigned long hsp_podf = (__raw_readl(CCM_BASE + CCM_PDR0) >> 20) & 0x03; + unsigned long fref = get_rate_mpll(); + + if (fref > 400 * 1000 * 1000) { + switch (hsp_podf) { + case 0: + return fref >> 2; + case 1: + return fref >> 3; + case 2: + return fref / 3; + } + } else { + switch (hsp_podf) { + case 0: + case 2: + return fref / 3; + case 1: + return fref / 6; + } + } + + return 0; +} + static int clk_cgr_enable(struct clk *clk) { u32 reg; @@ -353,7 +380,7 @@ DEFINE_CLOCK(i2c1_clk, 0, CCM_CGR1, 10, get_rate_ipg_per, NULL); DEFINE_CLOCK(i2c2_clk, 1, CCM_CGR1, 12, get_rate_ipg_per, NULL); DEFINE_CLOCK(i2c3_clk, 2, CCM_CGR1, 14, get_rate_ipg_per, NULL); DEFINE_CLOCK(iomuxc_clk, 0, CCM_CGR1, 16, NULL, NULL); -DEFINE_CLOCK(ipu_clk, 0, CCM_CGR1, 18, get_rate_ahb, NULL); +DEFINE_CLOCK(ipu_clk, 0, CCM_CGR1, 18, get_rate_hsp, NULL); DEFINE_CLOCK(kpp_clk, 0, CCM_CGR1, 20, get_rate_ipg, NULL); DEFINE_CLOCK(mlb_clk, 0, CCM_CGR1, 22, get_rate_ahb, NULL); DEFINE_CLOCK(mshc_clk, 0, CCM_CGR1, 24, get_rate_mshc, NULL); -- 2.46.0