[U-Boot] [PATCH 2/5] imx-common: Factor out get_ahb_clk()

[Dirk Behme]

Hi Fabio,

On 20.03.2012 22:40, Fabio Estevam wrote:
> get_ahb_clk() is a common function between mx5 and mx6.
> 
> Place it into imx-common directory.
> 
> Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
> ---
>  arch/arm/cpu/armv7/imx-common/cpu.c                |   23 ++++++++++++++++++++
>  arch/arm/cpu/armv7/mx5/clock.c                     |   17 +-------------
>  arch/arm/cpu/armv7/mx6/clock.c                     |   17 ++------------
>  arch/arm/include/asm/arch-mx5/sys_proto.h          |    1 +
>  .../asm/arch-mx6/{ccm_regs.h => crm_regs.h}        |    2 +-
>  arch/arm/include/asm/arch-mx6/sys_proto.h          |    1 +
>  6 files changed, 30 insertions(+), 31 deletions(-)
>  rename arch/arm/include/asm/arch-mx6/{ccm_regs.h => crm_regs.h} (99%)

We had this patch on a v2012.04.1 based test branch and it showed some 
strange issues with SD cards on i.MX6.

Depending on the SD card used (different ones) and the board (SabreLite 
and a custom one)

- the SD card just works fine as we are used to
- booting fails with "MMC init failed"
- booting fails with "Card did not respond to voltage select!"

Reverting this patch on the test branch makes all tested boards and 
tested SD cards work fine again.

I haven't looked into the details to debug the root cause, though.

So for the moment: NACK

Best regards

Dirk

> diff --git a/arch/arm/cpu/armv7/imx-common/cpu.c b/arch/arm/cpu/armv7/imx-common/cpu.c
> index 6d7486b..62b01e7 100644
> --- a/arch/arm/cpu/armv7/imx-common/cpu.c
> +++ b/arch/arm/cpu/armv7/imx-common/cpu.c
> @@ -29,6 +29,7 @@
>  #include <asm/arch/imx-regs.h>
>  #include <asm/arch/clock.h>
>  #include <asm/arch/sys_proto.h>
> +#include <asm/arch/crm_regs.h>
>  
>  #ifdef CONFIG_FSL_ESDHC
>  #include <fsl_esdhc.h>
> @@ -107,3 +108,25 @@ void reset_cpu(ulong addr)
>  {
>  	__raw_writew(4, WDOG1_BASE_ADDR);
>  }
> +
> +static u32 __get_periph_clk(void)
> +{
> +	return 0;	/* clock.c will override it */
> +}
> +
> +u32 get_periph_clk(void)
> +	__attribute__((weak, alias("__get_periph_clk")));
> +
> +u32 get_ahb_clk(void)
> +{
> +	struct mxc_ccm_reg *imx_ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
> +	u32 reg, ahb_podf;
> +
> +	reg = __raw_readl(&imx_ccm->cbcdr);
> +	reg &= MXC_CCM_CBCDR_AHB_PODF_MASK;
> +	ahb_podf = reg >> MXC_CCM_CBCDR_AHB_PODF_OFFSET;
> +
> +	return get_periph_clk() / (ahb_podf + 1);
> +
> +	return 0;
> +}
> diff --git a/arch/arm/cpu/armv7/mx5/clock.c b/arch/arm/cpu/armv7/mx5/clock.c
> index e92f106..a1c8411 100644
> --- a/arch/arm/cpu/armv7/mx5/clock.c
> +++ b/arch/arm/cpu/armv7/mx5/clock.c
> @@ -30,6 +30,7 @@
>  #include <asm/arch/crm_regs.h>
>  #include <asm/arch/clock.h>
>  #include <div64.h>
> +#include <asm/arch/sys_proto.h>
>  
>  enum pll_clocks {
>  	PLL1_CLOCK = 0,
> @@ -213,22 +214,6 @@ 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)
> diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c
> index ef98563..5d42051 100644
> --- a/arch/arm/cpu/armv7/mx6/clock.c
> +++ b/arch/arm/cpu/armv7/mx6/clock.c
> @@ -24,8 +24,9 @@
>  #include <asm/io.h>
>  #include <asm/errno.h>
>  #include <asm/arch/imx-regs.h>
> -#include <asm/arch/ccm_regs.h>
> +#include <asm/arch/crm_regs.h>
>  #include <asm/arch/clock.h>
> +#include <asm/arch/sys_proto.h>
>  
>  enum pll_clocks {
>  	PLL_SYS,	/* System PLL */
> @@ -34,7 +35,7 @@ enum pll_clocks {
>  	PLL_ENET,	/* ENET PLL */
>  };
>  
> -struct imx_ccm_reg *imx_ccm = (struct imx_ccm_reg *)CCM_BASE_ADDR;
> +struct mxc_ccm_reg *imx_ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
>  
>  void enable_usboh3_clk(unsigned char enable)
>  {
> @@ -139,18 +140,6 @@ static u32 get_periph_clk(void)
>  	return freq;
>  }
>  
> -
> -static u32 get_ahb_clk(void)
> -{
> -	u32 reg, ahb_podf;
> -
> -	reg = __raw_readl(&imx_ccm->cbcdr);
> -	reg &= MXC_CCM_CBCDR_AHB_PODF_MASK;
> -	ahb_podf = reg >> MXC_CCM_CBCDR_AHB_PODF_OFFSET;
> -
> -	return get_periph_clk() / (ahb_podf + 1);
> -}
> -
>  static u32 get_ipg_clk(void)
>  {
>  	u32 reg, ipg_podf;
> diff --git a/arch/arm/include/asm/arch-mx5/sys_proto.h b/arch/arm/include/asm/arch-mx5/sys_proto.h
> index 13d12ee..7250059 100644
> --- a/arch/arm/include/asm/arch-mx5/sys_proto.h
> +++ b/arch/arm/include/asm/arch-mx5/sys_proto.h
> @@ -35,5 +35,6 @@ void set_chipselect_size(int const);
>   */
>  
>  int fecmxc_initialize(bd_t *bis);
> +u32 get_ahb_clk(void);
>  
>  #endif
> diff --git a/arch/arm/include/asm/arch-mx6/ccm_regs.h b/arch/arm/include/asm/arch-mx6/crm_regs.h
> similarity index 99%
> rename from arch/arm/include/asm/arch-mx6/ccm_regs.h
> rename to arch/arm/include/asm/arch-mx6/crm_regs.h
> index 4af0b90..0e605c2 100644
> --- a/arch/arm/include/asm/arch-mx6/ccm_regs.h
> +++ b/arch/arm/include/asm/arch-mx6/crm_regs.h
> @@ -20,7 +20,7 @@
>  #ifndef __ARCH_ARM_MACH_MX6_CCM_REGS_H__
>  #define __ARCH_ARM_MACH_MX6_CCM_REGS_H__
>  
> -struct imx_ccm_reg {
> +struct mxc_ccm_reg {
>  	u32 ccr;	/* 0x0000 */
>  	u32 ccdr;
>  	u32 csr;
> diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h b/arch/arm/include/asm/arch-mx6/sys_proto.h
> index 668e77a..3bfc69c 100644
> --- a/arch/arm/include/asm/arch-mx6/sys_proto.h
> +++ b/arch/arm/include/asm/arch-mx6/sys_proto.h
> @@ -34,5 +34,6 @@ u32 get_cpu_rev(void);
>   */
>  
>  int fecmxc_initialize(bd_t *bis);
> +u32 get_ahb_clk(void);
>  
>  #endif