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| author | Fabio Estevam <fabio.estevam@nxp.com> | 2016-08-29 20:37:15 -0300 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2016-09-06 18:22:48 +0200 |
| commit | edf0093732225c2fd0791c3864e9a3eef1f92f19 (patch) | |
| tree | 1a5bce06d282527778b608f35c39aa68065bd98e /arch/arm | |
| parent | 946db0cbd01090b35eb1439fa7c4ca7e015fc18b (diff) | |
| download | u-boot-imx-edf0093732225c2fd0791c3864e9a3eef1f92f19.zip u-boot-imx-edf0093732225c2fd0791c3864e9a3eef1f92f19.tar.gz u-boot-imx-edf0093732225c2fd0791c3864e9a3eef1f92f19.tar.bz2 | |
mx6: ddr: Allow changing REFSEL and REFR fields
Currently MX6 SPL DDR initialization hardcodes the REF_SEL and
REFR fields of the MDREF register as 1 and 7, respectively for
DDR3 and 0 and 3 for LPDDR2.
Looking at the MDREF initialization done via DCD we see that
boards do need to initialize these fields differently:
$ git grep 0x021b0020 board/
board/bachmann/ot1200/mx6q_4x_mt41j128.cfg:DATA 4 0x021b0020 0x00005800
board/ccv/xpress/imximage.cfg:DATA 4 0x021b0020 0x00000800 /* MMDC0_MDREF */
board/freescale/mx6qarm2/imximage.cfg:DATA 4 0x021b0020 0x7800
board/freescale/mx6qarm2/imximage.cfg:DATA 4 0x021b0020 0x00005800
board/freescale/mx6qarm2/imximage_mx6dl.cfg:DATA 4 0x021b0020 0x00005800
board/freescale/mx6qarm2/imximage_mx6dl.cfg:DATA 4 0x021b0020 0x00005800
board/freescale/mx6qsabreauto/imximage.cfg:DATA 4 0x021b0020 0x00005800
board/freescale/mx6qsabreauto/mx6dl.cfg:DATA 4 0x021b0020 0x00005800
board/freescale/mx6qsabreauto/mx6qp.cfg:DATA 4 0x021b0020 0x00005800
board/freescale/mx6sabresd/mx6dlsabresd.cfg:DATA 4 0x021b0020 0x00005800
board/freescale/mx6sabresd/mx6q_4x_mt41j128.cfg:DATA 4 0x021b0020 0x00005800
board/freescale/mx6slevk/imximage.cfg:DATA 4 0x021b0020 0x00001800
board/freescale/mx6sxsabreauto/imximage.cfg:DATA 4 0x021b0020 0x00000800
board/freescale/mx6sxsabresd/imximage.cfg:DATA 4 0x021b0020 0x00000800
board/warp/imximage.cfg:DATA 4 0x021b0020 0x00001800
So introduce a mechanism for users to be able to configure
REFSEL and REFR fields as needed.
Keep all the mx6 SPL users in their current REF_SEL and REFR values,
so no functional changes for the existing users.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Eric Nelson <eric@nelint.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/cpu/armv7/mx6/ddr.c | 6 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-mx6/mx6-ddr.h | 2 |
2 files changed, 4 insertions, 4 deletions
diff --git a/arch/arm/cpu/armv7/mx6/ddr.c b/arch/arm/cpu/armv7/mx6/ddr.c index f151eec..7beb7ea 100644 --- a/arch/arm/cpu/armv7/mx6/ddr.c +++ b/arch/arm/cpu/armv7/mx6/ddr.c @@ -1166,8 +1166,7 @@ void mx6_lpddr2_cfg(const struct mx6_ddr_sysinfo *sysinfo, mmdc0->mpzqhwctrl = val; /* Step 12: Configure and activate periodic refresh */ - mmdc0->mdref = (0 << 14) | /* REF_SEL: Periodic refresh cycle: 64kHz */ - (3 << 11); /* REFR: Refresh Rate - 4 refreshes */ + mmdc0->mdref = (sysinfo->refsel << 14) | (sysinfo->refr << 11); /* Step 13: Deassert config request - init complete */ mmdc0->mdscr = 0x00000000; @@ -1472,8 +1471,7 @@ void mx6_ddr3_cfg(const struct mx6_ddr_sysinfo *sysinfo, MMDC1(mpzqhwctrl, val); /* Step 12: Configure and activate periodic refresh */ - mmdc0->mdref = (1 << 14) | /* REF_SEL: Periodic refresh cycle: 32kHz */ - (7 << 11); /* REFR: Refresh Rate - 8 refreshes */ + mmdc0->mdref = (sysinfo->refsel << 14) | (sysinfo->refr << 11); /* Step 13: Deassert config request - init complete */ mmdc0->mdscr = 0x00000000; diff --git a/arch/arm/include/asm/arch-mx6/mx6-ddr.h b/arch/arm/include/asm/arch-mx6/mx6-ddr.h index 12c30d2..9922409 100644 --- a/arch/arm/include/asm/arch-mx6/mx6-ddr.h +++ b/arch/arm/include/asm/arch-mx6/mx6-ddr.h @@ -408,6 +408,8 @@ struct mx6_ddr_sysinfo { u8 sde_to_rst; /* Time from SDE enable until DDR reset# is high */ u8 pd_fast_exit;/* enable precharge powerdown fast-exit */ u8 ddr_type; /* DDR type: DDR3(0) or LPDDR2(1) */ + u8 refsel; /* REF_SEL field of register MDREF */ + u8 refr; /* REFR field of register MDREF */ }; /* |