[U-Boot] [PATCH 2/4 V2] MX5: Add AHB clock reporting and fix IPG clock reporting

Marek Vasut
2011-09-22T19:20:37Z

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Jason Hui <jason.hui@linaro.org>
---
arch/arm/cpu/armv7/mx5/clock.c | 36 +++++++++++++++++++++++++++---------
1 files changed, 27 insertions(+), 9 deletions(-)

V2: Use get_periph_clock() as AHB clocksource.

diff --git a/arch/arm/cpu/armv7/mx5/clock.c b/arch/arm/cpu/armv7/mx5/clock.c
index 9f37f7f..b87b29e 100644
--- a/arch/arm/cpu/armv7/mx5/clock.c
+++ b/arch/arm/cpu/armv7/mx5/clock.c
@@ -152,18 +152,35 @@ static u32 get_periph_clk(void)
}

/*
+ * Get the rate of ahb clock.
+ */
+static u32 get_ahb_clk(void)
+{
+ uint32_t freq, div, reg;
+
+ freq = get_periph_clk();
+
+ reg = __raw_readl(&mxc_ccm->cbcdr);
+ div = ((reg & MXC_CCM_CBCDR_AHB_PODF_MASK) >>
+ MXC_CCM_CBCDR_AHB_PODF_OFFSET) + 1;
+
+ return freq / div;
+}
+
+/*
* Get the rate of ipg clock.
*/
static u32 get_ipg_clk(void)
{
- u32 ahb_podf, ipg_podf;
-
- ahb_podf = __raw_readl(&mxc_ccm->cbcdr);
- ipg_podf = (ahb_podf & MXC_CCM_CBCDR_IPG_PODF_MASK) >>
- MXC_CCM_CBCDR_IPG_PODF_OFFSET;
- ahb_podf = (ahb_podf & MXC_CCM_CBCDR_AHB_PODF_MASK) >>
- MXC_CCM_CBCDR_AHB_PODF_OFFSET;
- return get_periph_clk() / ((ahb_podf + 1) * (ipg_podf + 1));
+ uint32_t freq, reg, div;
+
+ freq = get_ahb_clk();
+
+ reg = __raw_readl(&mxc_ccm->cbcdr);
+ div = ((reg & MXC_CCM_CBCDR_IPG_PODF_MASK) >>
+ MXC_CCM_CBCDR_IPG_PODF_OFFSET) + 1;
+
+ return freq / div;
}

/*
@@ -290,7 +307,7 @@ unsigned int mxc_get_clock(enum mxc_clock clk)
case MXC_ARM_CLK:
return get_mcu_main_clk();
case MXC_AHB_CLK:
- break;
+ return get_ahb_clk();
case MXC_IPG_CLK:
return get_ipg_clk();
case MXC_IPG_PERCLK:
@@ -336,6 +353,7 @@ int do_mx5_showclocks(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
freq = decode_pll(mxc_plls[PLL4_CLOCK], CONFIG_SYS_MX5_HCLK);
printf("pll4: %dMHz\n", freq / 1000000);
#endif
+ printf("ahb clock : %dHz\n", mxc_get_clock(MXC_AHB_CLK));
printf("ipg clock : %dHz\n", mxc_get_clock(MXC_IPG_CLK));
printf("ipg per clock : %dHz\n", mxc_get_clock(MXC_IPG_PERCLK));

--
1.7.5.4