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imx-common: cpu: add imx_ddr_size

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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.kisky@boundarydevices.com>
This commit is contained in:
Troy Kisky 2012-10-23 10:57:48 +00:00 committed by Stefano Babic
parent 5ea6d7c8fc
commit eb0344d974
3 changed files with 52 additions and 0 deletions
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50
arch/arm/imx-common/cpu.c
View File

@ -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)

1
arch/arm/include/asm/arch-mx5/sys_proto.h
View File

@ -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);

1
arch/arm/include/asm/arch-mx6/sys_proto.h
View File

@ -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);
void set_vddsoc(u32 mv);