[U-Boot] [PATCH 2/3] mx25pdk: Add esdhc support

["Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>]

On Thursday, October 11, 2012 9:17:46 AM, Stefano Babic wrote:
> Am 11/10/2012 05:58, schrieb Fabio Estevam:
> > From: Fabio Estevam <fabio.estevam@freescale.com>
> > 
> > mx25pdk has a SD/MMC slot connected to esdhc1.
> > 
> > Add support for it and allow the environment variables to be saved
> > into SD/MMC.
> > 
> > Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
> > ---
> 
> Hi Fabio,
> 
> >  board/freescale/mx25pdk/mx25pdk.c |   51
> >  +++++++++++++++++++++++++++++++++++++
> >  include/configs/mx25pdk.h         |   16 +++++++++++-
> >  2 files changed, 66 insertions(+), 1 deletion(-)
> > 
> > diff --git a/board/freescale/mx25pdk/mx25pdk.c
> > b/board/freescale/mx25pdk/mx25pdk.c
> > index 4a8352f..e850b3e 100644
> > --- a/board/freescale/mx25pdk/mx25pdk.c
> > +++ b/board/freescale/mx25pdk/mx25pdk.c
> > @@ -19,12 +19,23 @@
> >  
> >  #include <common.h>
> >  #include <asm/io.h>
> > +#include <asm/gpio.h>
> >  #include <asm/arch/imx-regs.h>
> >  #include <asm/arch/imx25-pinmux.h>
> >  #include <asm/arch/sys_proto.h>
> > +#include <mmc.h>
> > +#include <fsl_esdhc.h>
> > +
> > +#define CARD_DETECT		IMX_GPIO_NR(2, 1)
> >  
> >  DECLARE_GLOBAL_DATA_PTR;
> >  
> > +#ifdef CONFIG_FSL_ESDHC
> > +struct fsl_esdhc_cfg esdhc_cfg[1] = {
> > +	{IMX_MMC_SDHC1_BASE},
> > +};
> > +#endif
> > +
> >  int dram_init(void)
> >  {
> >  	/* dram_init must store complete ramsize in gd->ram_size */
> > @@ -48,6 +59,46 @@ int board_init(void)
> >  	return 0;
> >  }
> >  
> > +#ifdef CONFIG_FSL_ESDHC
> > +int board_mmc_getcd(struct mmc *mmc)
> > +{
> > +	struct iomuxc_mux_ctl *muxctl;
> > +	struct iomuxc_pad_ctl *padctl;
> > +	u32 gpio_mux_mode = MX25_PIN_MUX_MODE(5);
> > +
> > +	/*
> > +	 * Set up the Card Detect pin.
> > +	 *
> > +	 * SD1_GPIO_CD: gpio2_1 is ALT 5 mode of pin A15
> > +	 *
> > +	 */
> > +	muxctl = (struct iomuxc_mux_ctl *)IMX_IOPADMUX_BASE;
> > +	padctl = (struct iomuxc_pad_ctl *)IMX_IOPADCTL_BASE;
> > +
> > +	writel(gpio_mux_mode, &muxctl->pad_a15);
> > +	writel(0x0, &padctl->pad_a15);
> > +
> > +	gpio_direction_input(CARD_DETECT);
> > +	return !gpio_get_value(CARD_DETECT);
> > +}
> > +
> > +int board_mmc_init(bd_t *bis)
> > +{
> > +	struct iomuxc_mux_ctl *muxctl;
> > +	u32 sdhc1_mux_mode = MX25_PIN_MUX_MODE(0) | MX25_PIN_MUX_SION;
> > +
> > +	muxctl = (struct iomuxc_mux_ctl *)IMX_IOPADMUX_BASE;
> > +	writel(sdhc1_mux_mode, &muxctl->pad_sd1_cmd);
> > +	writel(sdhc1_mux_mode, &muxctl->pad_sd1_clk);
> > +	writel(sdhc1_mux_mode, &muxctl->pad_sd1_data0);
> > +	writel(sdhc1_mux_mode, &muxctl->pad_sd1_data1);
> > +	writel(sdhc1_mux_mode, &muxctl->pad_sd1_data2);
> > +	writel(sdhc1_mux_mode, &muxctl->pad_sd1_data3);
> > +
> 
> You need also to set up the SDHC clock. This comes after merging:
> 
> 	http://patchwork.ozlabs.org/patch/188329/
> 
> Adding
> 	esdhc_cfg.sdhc_clk = mxc_get_clock(MXC_ESDHC1_CLK);
> 
> before calling fsl_esdhc_initialize() should be enough.

Adding
#include <asm/arch/clock.h>
is also needed.

Best regards,
Beno?t