[PATCH v3 2/4] ARM: novena: Setup RAM using static configuration
John Watts
contact at jookia.org
Sun Jan 29 15:27:58 PST 2023
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 at jookia.org>
---
arch/arm/boards/novena/ddr_regs.h | 119 ++++++++++++++++++++++++++++++
arch/arm/boards/novena/lowlevel.c | 14 +++-
2 files changed, 131 insertions(+), 2 deletions(-)
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 at 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 58b925c311..3acf983ee0 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 STACK_TOP (MX6_OCRAM_BASE_ADDR + MX6_OCRAM_MAX_SIZE)
@@ -32,6 +34,12 @@ 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;
@@ -58,8 +66,10 @@ ENTRY_FUNCTION_WITHSTACK(start_imx6q_novena, STACK_TOP, r0, r1, r2)
imx6_ungate_all_peripherals();
setup_uart();
- if (!running_from_ram())
+ if (!running_from_ram()) {
+ setup_ram();
load_barebox();
- else
+ } else {
imx6q_barebox_entry(__dtb_imx6q_novena_start);
+ }
}
--
2.39.1
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