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mx6: ddr: add routine to return DDR calibration data

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Add routine mmdc_read_calibration() to return the output of DDR
calibration. This can be used for debugging or to aid in construction
of static memory configuration.

This routine will be used in a subsequent patch set adding a virtual
"mx6memcal" board, but could also be useful when gathering statistics
during an initial production run.

Signed-off-by: Eric Nelson <eric@nelint.com>
This commit is contained in:
Eric Nelson 2016-10-30 16:33:49 -07:00 committed by Stefano Babic
parent 7f17fb7400
commit 48c7d4379b
2 changed files with 25 additions and 0 deletions
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23
arch/arm/cpu/armv7/mx6/ddr.c
View File

@ -1501,6 +1501,29 @@ void mx6_ddr3_cfg(const struct mx6_ddr_sysinfo *sysinfo,
mdelay(1);
}
void mmdc_read_calibration(struct mx6_ddr_sysinfo const *sysinfo,
struct mx6_mmdc_calibration *calib)
{
struct mmdc_p_regs *mmdc0 = (struct mmdc_p_regs *)MMDC_P0_BASE_ADDR;
struct mmdc_p_regs *mmdc1 = (struct mmdc_p_regs *)MMDC_P1_BASE_ADDR;
calib->p0_mpwldectrl0 = readl(&mmdc0->mpwldectrl0);
calib->p0_mpwldectrl1 = readl(&mmdc0->mpwldectrl1);
calib->p0_mpdgctrl0 = readl(&mmdc0->mpdgctrl0);
calib->p0_mpdgctrl1 = readl(&mmdc0->mpdgctrl1);
calib->p0_mprddlctl = readl(&mmdc0->mprddlctl);
calib->p0_mpwrdlctl = readl(&mmdc0->mpwrdlctl);
if (sysinfo->dsize == 2) {
calib->p1_mpwldectrl0 = readl(&mmdc1->mpwldectrl0);
calib->p1_mpwldectrl1 = readl(&mmdc1->mpwldectrl1);
calib->p1_mpdgctrl0 = readl(&mmdc1->mpdgctrl0);
calib->p1_mpdgctrl1 = readl(&mmdc1->mpdgctrl1);
calib->p1_mprddlctl = readl(&mmdc1->mprddlctl);
calib->p1_mpwrdlctl = readl(&mmdc1->mpwrdlctl);
}
}
void mx6_dram_cfg(const struct mx6_ddr_sysinfo *sysinfo,
const struct mx6_mmdc_calibration *calib,
const void *ddr_cfg)

2
arch/arm/include/asm/arch-mx6/mx6-ddr.h
View File

@ -461,6 +461,8 @@ void mx6sl_dram_iocfg(unsigned width,
#if defined(CONFIG_MX6QDL) || defined(CONFIG_MX6Q) || defined(CONFIG_MX6D)
int mmdc_do_write_level_calibration(struct mx6_ddr_sysinfo const *sysinfo);
int mmdc_do_dqs_calibration(struct mx6_ddr_sysinfo const *sysinfo);
void mmdc_read_calibration(struct mx6_ddr_sysinfo const *sysinfo,
struct mx6_mmdc_calibration *calib);
#endif
/* configure mx6 mmdc registers */