diff options
| author | Benoît Thébaudeau <benoit.thebaudeau@advansee.com> | 2012-09-27 10:24:37 +0000 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2012-10-15 11:54:12 -0700 |
| commit | 323846561a7253433818d0e04630cb83433fa0f1 (patch) | |
| tree | 1b37ec812ec221c6e069e5c9c9d5c11cae0c328d /arch/arm/cpu | |
| parent | be2f93b1ea03adc9409ae3243ae4c3b831f098ae (diff) | |
mx5/6 clocks: Fix SDHC clocks
The i.MX5 eSDHC clocks were considered as coming from the IPG clock although
they have dedicated clock paths.
Also, on i.MX5/6, each SDHC instance has a dedicated clock, so gd->sdhc_clk must
be set accordingly. This is good for the case only a single SDHC instance is
used (initialization made with fsl_esdhc_mmc_init()). A future patch will fix
the multi-instance use case (initialization made directly with
fsl_esdhc_initialize()).
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Eric Bénard <eric@eukrea.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Diffstat (limited to 'arch/arm/cpu')
| -rw-r--r-- | arch/arm/cpu/armv7/mx5/clock.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/mx5/clock.c b/arch/arm/cpu/armv7/mx5/clock.c index 46983ff33f..2709860ca2 100644 --- a/arch/arm/cpu/armv7/mx5/clock.c +++ b/arch/arm/cpu/armv7/mx5/clock.c @@ -394,6 +394,44 @@ static u32 imx_get_cspiclk(void) return ret_val; } +/* + * get esdhc clock rate. + */ +static u32 get_esdhc_clk(u32 port) +{ + u32 clk_sel = 0, pred = 0, podf = 0, freq = 0; + u32 cscmr1 = readl(&mxc_ccm->cscmr1); + u32 cscdr1 = readl(&mxc_ccm->cscdr1); + + switch (port) { + case 0: + clk_sel = MXC_CCM_CSCMR1_ESDHC1_MSHC1_CLK_SEL_RD(cscmr1); + pred = MXC_CCM_CSCDR1_ESDHC1_MSHC1_CLK_PRED_RD(cscdr1); + podf = MXC_CCM_CSCDR1_ESDHC1_MSHC1_CLK_PODF_RD(cscdr1); + break; + case 1: + clk_sel = MXC_CCM_CSCMR1_ESDHC2_MSHC2_CLK_SEL_RD(cscmr1); + pred = MXC_CCM_CSCDR1_ESDHC2_MSHC2_CLK_PRED_RD(cscdr1); + podf = MXC_CCM_CSCDR1_ESDHC2_MSHC2_CLK_PODF_RD(cscdr1); + break; + case 2: + if (cscmr1 & MXC_CCM_CSCMR1_ESDHC3_CLK_SEL) + return get_esdhc_clk(1); + else + return get_esdhc_clk(0); + case 3: + if (cscmr1 & MXC_CCM_CSCMR1_ESDHC4_CLK_SEL) + return get_esdhc_clk(1); + else + return get_esdhc_clk(0); + default: + break; + } + + freq = get_standard_pll_sel_clk(clk_sel) / ((pred + 1) * (podf + 1)); + return freq; +} + static u32 get_axi_a_clk(void) { u32 cbcdr = readl(&mxc_ccm->cbcdr); @@ -477,6 +515,14 @@ unsigned int mxc_get_clock(enum mxc_clock clk) return get_uart_clk(); case MXC_CSPI_CLK: return imx_get_cspiclk(); + case MXC_ESDHC_CLK: + return get_esdhc_clk(0); + case MXC_ESDHC2_CLK: + return get_esdhc_clk(1); + case MXC_ESDHC3_CLK: + return get_esdhc_clk(2); + case MXC_ESDHC4_CLK: + return get_esdhc_clk(3); case MXC_FEC_CLK: return get_ipg_clk(); case MXC_SATA_CLK: |