On 04/10/2012 03:47, Troy Kisky wrote:
> Read memory setup registers to determine size
> of available ram. This routine works for mx53/mx6x
>
> I need this because when mx6solo called get_ram_size
> with a too large maximum size, the system hanged.
>
> Signed-off-by: Troy Kisky <troy.ki...@boundarydevices.com>
>
Hi Troy,
I am interested to better understand why get_ram_size() does not work.
It seems to me you discovered a bug in this function, and you circumvent
it decoding the DRAM controller setup to get the RAM size.
Because the max size is added to the start address in get_ram_size(), I
have the feeling that this overwlow the long value, and maybe can be
fixed swithcing to a "long long". With which parameters to
get_ram_size() does your board hang ?
> ---
> New patch with V3. V2 had code in mx6qsabrelite.c
> ---
> arch/arm/imx-common/cpu.c | 50
> +++++++++++++++++++++++++++++
> arch/arm/include/asm/arch-mx5/sys_proto.h | 1 +
> arch/arm/include/asm/arch-mx6/sys_proto.h | 1 +
> 3 files changed, 52 insertions(+)
>
> diff --git a/arch/arm/imx-common/cpu.c b/arch/arm/imx-common/cpu.c
> index 102c254..5081908 100644
> --- a/arch/arm/imx-common/cpu.c
> +++ b/arch/arm/imx-common/cpu.c
> @@ -65,6 +65,56 @@ char *get_reset_cause(void)
> }
> }
>
> +#if defined(CONFIG_MX53) || defined(CONFIG_MX6)
> +#if defined(CONFIG_MX53)
> +#define MEMCTL_BASE ESDCTL_BASE_ADDR;
> +#else
> +#define MEMCTL_BASE MMDC_P0_BASE_ADDR;
> +#endif
> +static const unsigned char col_lookup[] = {9, 10, 11, 8, 12, 9, 9, 9};
> +static const unsigned char bank_lookup[] = {3, 2};
> +
> +struct esd_mmdc_regs {
> + uint32_t ctl;
> + uint32_t pdc;
> + uint32_t otc;
> + uint32_t cfg0;
> + uint32_t cfg1;
> + uint32_t cfg2;
> + uint32_t misc;
> + uint32_t scr;
> + uint32_t ref;
> + uint32_t rsvd1;
> + uint32_t rsvd2;
> + uint32_t rwd;
> + uint32_t or;
> + uint32_t mrr;
> + uint32_t cfg3lp;
> + uint32_t mr4;
> +};
> +
> +#define ESD_MMDC_CTL_GET_ROW(mdctl) ((ctl >> 24) & 7)
> +#define ESD_MMDC_CTL_GET_COLUMN(mdctl) ((ctl >> 20) & 7)
> +#define ESD_MMDC_CTL_GET_WIDTH(mdctl) ((ctl >> 16) & 3)
> +#define ESD_MMDC_CTL_GET_CS1(mdctl) ((ctl >> 30) & 1)
> +#define ESD_MMDC_MISC_GET_BANK(mdmisc) ((misc >> 5) & 1)
> +
> +unsigned imx_ddr_size(void)
> +{
> + struct esd_mmdc_regs *mem = (struct esd_mmdc_regs *)MEMCTL_BASE;
> + unsigned ctl = readl(&mem->ctl);
> + unsigned misc = readl(&mem->misc);
> + int bits = 11 + 0 + 0 + 1; /* row + col + bank + width */
> +
> + bits += ESD_MMDC_CTL_GET_ROW(ctl);
> + bits += col_lookup[ESD_MMDC_CTL_GET_COLUMN(ctl)];
> + bits += bank_lookup[ESD_MMDC_MISC_GET_BANK(misc)];
> + bits += ESD_MMDC_CTL_GET_WIDTH(ctl);
> + bits += ESD_MMDC_CTL_GET_CS1(ctl);
> + return 1 << bits;
> +}
> +#endif
> +
> #if defined(CONFIG_DISPLAY_CPUINFO)
>
> const char *get_imx_type(u32 imxtype)
> diff --git a/arch/arm/include/asm/arch-mx5/sys_proto.h
> b/arch/arm/include/asm/arch-mx5/sys_proto.h
> index 4435be1..93ad1c6 100644
> --- a/arch/arm/include/asm/arch-mx5/sys_proto.h
> +++ b/arch/arm/include/asm/arch-mx5/sys_proto.h
> @@ -33,6 +33,7 @@
>
> #define is_soc_rev(rev) ((get_cpu_rev() & 0xFF) - rev)
> u32 get_cpu_rev(void);
> +unsigned imx_ddr_size(void);
> void sdelay(unsigned long);
> void set_chipselect_size(int const);
>
> diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h
> b/arch/arm/include/asm/arch-mx6/sys_proto.h
> index 6627bbc..3193297 100644
> --- a/arch/arm/include/asm/arch-mx6/sys_proto.h
> +++ b/arch/arm/include/asm/arch-mx6/sys_proto.h
> @@ -34,6 +34,7 @@
> #define is_soc_rev(rev) ((get_cpu_rev() & 0xFF) - rev)
> u32 get_cpu_rev(void);
> const char *get_imx_type(u32 imxtype);
> +unsigned imx_ddr_size(void);
>
Best regards,
Stefano Babic
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