Re: [PATCH v2 2/4] ARM: novena: Setup RAM using static configuration

[Marco Felsch <m.felsch@pengutronix.de>]

Hi John,

On 23-01-26, John Watts wrote:
> The Novena laptops were shipped with a 4GB stick that can be set up
> using this DDR3 configuration.
> This isn't ideal as the stick is swappable, but it will work for
> most people.
> 
> The DDR registers are copied from /board/kosagi/novena/novena_spl.c
> from the Novena U-Boot fork (tag novena-r2) with two changes:
> 
> - Bank interleaving is disabled: The Novena U-Boot code disables it
>   unconditionally during execution anyway
> - Page size is set to 1KB: I'm not sure the hardware supports x16 DIMMs
> 
> Mainline U-Boot has similar code, but the timing differences don't work
> on my board so I'm unable to test or port that code over.
> 
> Signed-off-by: John Watts <contact@jookia.org>

this patch should be part of patch1 since without this one you can't
boot the board, right?

> ---
>  arch/arm/boards/novena/ddr_regs.h | 119 ++++++++++++++++++++++++++++++
>  arch/arm/boards/novena/lowlevel.c |   9 +++
>  2 files changed, 128 insertions(+)
>  create mode 100644 arch/arm/boards/novena/ddr_regs.h
> 
> diff --git a/arch/arm/boards/novena/ddr_regs.h b/arch/arm/boards/novena/ddr_regs.h
> new file mode 100644
> index 0000000000..5f18d5e0e4
> --- /dev/null
> +++ b/arch/arm/boards/novena/ddr_regs.h
> @@ -0,0 +1,119 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/* SPDX-FileCopyrightText: 2014 Marek Vasut <marex@denx.de> */
> +
> +#ifndef NOVENA_DDR_REGS_H
> +#define NOVENA_DDR_REGS_H
> +
> +/* MEMORY CONTROLLER CONFIGURATION */
> +
> +static struct mx6dq_iomux_ddr_regs novena_ddr_regs = {
> +	/* SDCLK[0:1], CAS, RAS, Reset: Differential input, 40ohm */
> +	.dram_sdclk_0		= 0x00020038,
> +	.dram_sdclk_1		= 0x00020038,
> +	.dram_cas		= 0x00000038,
> +	.dram_ras		= 0x00000038,
> +	.dram_reset		= 0x00000038,
> +	/* SDCKE[0:1]: 100k pull-up */
> +	.dram_sdcke0		= 0x00003000,
> +	.dram_sdcke1		= 0x00003000,
> +	/* SDBA2: pull-up disabled */
> +	.dram_sdba2		= 0x00000000,
> +	/* SDODT[0:1]: 100k pull-up, 40 ohm */
> +	.dram_sdodt0		= 0x00000038,
> +	.dram_sdodt1		= 0x00000038,
> +	/* SDQS[0:7]: Differential input, 40 ohm */
> +	.dram_sdqs0		= 0x00000038,
> +	.dram_sdqs1		= 0x00000038,
> +	.dram_sdqs2		= 0x00000038,
> +	.dram_sdqs3		= 0x00000038,
> +	.dram_sdqs4		= 0x00000038,
> +	.dram_sdqs5		= 0x00000038,
> +	.dram_sdqs6		= 0x00000038,
> +	.dram_sdqs7		= 0x00000038,
> +
> +	/* DQM[0:7]: Differential input, 40 ohm */
> +	.dram_dqm0		= 0x00000038,
> +	.dram_dqm1		= 0x00000038,
> +	.dram_dqm2		= 0x00000038,
> +	.dram_dqm3		= 0x00000038,
> +	.dram_dqm4		= 0x00000038,
> +	.dram_dqm5		= 0x00000038,
> +	.dram_dqm6		= 0x00000038,
> +	.dram_dqm7		= 0x00000038,
> +};
> +
> +static struct mx6dq_iomux_grp_regs novena_grp_regs = {
> +	/* DDR3 */
> +	.grp_ddr_type		= 0x000c0000,
> +	.grp_ddrmode_ctl	= 0x00020000,
> +	/* Disable DDR pullups */
> +	.grp_ddrpke		= 0x00000000,
> +	/* ADDR[00:16], SDBA[0:1]: 40 ohm */
> +	.grp_addds		= 0x00000038,
> +	/* CS0/CS1/SDBA2/CKE0/CKE1/SDWE: 40 ohm */
> +	.grp_ctlds		= 0x00000038,
> +	/* DATA[00:63]: Differential input, 40 ohm */
> +	.grp_ddrmode		= 0x00020000,
> +	.grp_b0ds		= 0x00000038,
> +	.grp_b1ds		= 0x00000038,
> +	.grp_b2ds		= 0x00000038,
> +	.grp_b3ds		= 0x00000038,
> +	.grp_b4ds		= 0x00000038,
> +	.grp_b5ds		= 0x00000038,
> +	.grp_b6ds		= 0x00000038,
> +	.grp_b7ds		= 0x00000038,
> +};
> +
> +/* MEMORY STICK CONFIGURATION */
> +
> +static struct mx6_mmdc_calibration novena_mmdc_calib = {
> +	/* write leveling calibration determine */
> +	.p0_mpwldectrl0		= 0x00420048,
> +	.p0_mpwldectrl1		= 0x006f0059,
> +	.p1_mpwldectrl0		= 0x005a0104,
> +	.p1_mpwldectrl1		= 0x01070113,
> +	/* Read DQS Gating calibration */
> +	.p0_mpdgctrl0		= 0x437c040b,
> +	.p0_mpdgctrl1		= 0x0413040e,
> +	.p1_mpdgctrl0		= 0x444f0446,
> +	.p1_mpdgctrl1		= 0x044d0422,
> +	/* Read Calibration: DQS delay relative to DQ read access */
> +	.p0_mprddlctl		= 0x4c424249,
> +	.p1_mprddlctl		= 0x4e48414f,
> +	/* Write Calibration: DQ/DM delay relative to DQS write access */
> +	.p0_mpwrdlctl		= 0x42414641,
> +	.p1_mpwrdlctl		= 0x46374b43,
> +};
> +
> +static struct mx6_ddr_sysinfo novena_ddr_info = {
> +	/* Width of data bus: 0=16, 1=32, 2=64 */
> +	.dsize		= 2,
> +	/* Config for full 4GB range so that get_mem_size() works */
> +	.cs_density	= 32,	/* 32Gb per CS */
> +	/* Single chip select */
> +	.ncs		= 1,
> +	.cs1_mirror	= 0,
> +	.rtt_wr		= 1,	/* RTT_Wr = RZQ/4 */
> +	.rtt_nom	= 2,	/* RTT_Nom = RZQ/2 */
> +	.walat		= 3,	/* Write additional latency */
> +	.ralat		= 7,	/* Read additional latency */
> +	.mif3_mode	= 3,	/* Command prediction working mode */
> +	.bi_on		= 0,	/* Bank interleaving disabled */
> +	.sde_to_rst	= 0x10,	/* 14 cycles, 200us (JEDEC default) */
> +	.rst_to_cke	= 0x23,	/* 33 cycles, 500us (JEDEC default) */
> +};
> +
> +static struct mx6_ddr3_cfg novena_ddr_cfg = {
> +	.mem_speed	= 1600,
> +	.density	= 4,
> +	.width		= 64,
> +	.banks		= 8,
> +	.rowaddr	= 16,
> +	.coladdr	= 10,
> +	.pagesz		= 1,
> +	.trcd		= 1300,
> +	.trcmin		= 4900,
> +	.trasmin	= 3590,
> +};
> +
> +#endif
> diff --git a/arch/arm/boards/novena/lowlevel.c b/arch/arm/boards/novena/lowlevel.c
> index 2052ca9de8..ef8acc8600 100644
> --- a/arch/arm/boards/novena/lowlevel.c
> +++ b/arch/arm/boards/novena/lowlevel.c
> @@ -7,9 +7,11 @@
>  #include <mach/esdctl.h>
>  #include <mach/generic.h>
>  #include <mach/imx6.h>
> +#include <mach/imx6-mmdc.h>
>  #include <mach/iomux-mx6.h>
>  #include <mach/xload.h>
>  #include <soc/fsl/fsl_udc.h>
> +#include "ddr_regs.h"
>  
>  #define MX6_OCRAM_BASE_ADDR 0x00900000
>  #define STACK_TOP (MX6_OCRAM_BASE_ADDR + SZ_128K)
> @@ -31,6 +33,12 @@ static void setup_uart(void)
>  	pr_debug(">");
>  }
>  
> +static void setup_ram(void)
> +{
> +	mx6dq_dram_iocfg(64, &novena_ddr_regs, &novena_grp_regs);
> +	mx6_dram_cfg(&novena_ddr_info, &novena_mmdc_calib, &novena_ddr_cfg);
> +}
> +
>  static void load_barebox(void)
>  {
>  	enum bootsource bootsrc;
> @@ -66,6 +74,7 @@ ENTRY_FUNCTION_WITHSTACK(start_imx6q_novena, STACK_TOP, r0, r1, r2)
>  	if (!running_from_ram()) {
>  		imx6_ungate_all_peripherals();
>  		setup_uart();
> +		setup_ram();

Nit: You can also move the setup_ram() into the load_barebox() function.

Regards,
  Marco

>  		load_barebox();
>  	} else {
>  		boot_barebox();
> -- 
> 2.39.0
> 
> 
>