+// SPDX-License-Identifier: GPL-2.0+
/*
* Freescale i.MX28 RAM init
*
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
* on behalf of DENX Software Engineering GmbH
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
*/
#include <common.h>
#include <config.h>
+#include <init.h>
+#include <log.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/sys_proto.h>
#include "mxs_init.h"
-static uint32_t dram_vals[] = {
+__weak uint32_t mxs_dram_vals[] = {
/*
* i.MX28 DDR2 at 200MHz
*/
0x00000000, 0x00000000, 0x00010101, 0x01010101,
0x000f0f01, 0x0f02020a, 0x00000000, 0x00010101,
0x00000100, 0x00000100, 0x00000000, 0x00000002,
- 0x01010000, 0x05060302, 0x06005003, 0x0a0000c8,
- 0x02009c40, 0x0000030c, 0x0036a609, 0x031a0612,
+ 0x01010000, 0x07080403, 0x06005003, 0x0a0000c8,
+ 0x02009c40, 0x0002030c, 0x0036a609, 0x031a0612,
0x02030202, 0x00c8001c, 0x00000000, 0x00000000,
0x00012100, 0xffff0303, 0x00012100, 0xffff0303,
0x00012100, 0xffff0303, 0x00012100, 0xffff0303,
0x00000003, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000612, 0x01000F02,
- 0x06120612, 0x00000200, 0x00020007, 0xf5014b27,
- 0xf5014b27, 0xf5014b27, 0xf5014b27, 0x07000300,
- 0x07000300, 0x07000300, 0x07000300, 0x00000006,
+ 0x06120612, 0x00000200, 0x00020007, 0xf4004a27,
+ 0xf4004a27, 0xf4004a27, 0xf4004a27, 0x07000300,
+ 0x07000300, 0x07400300, 0x07400300, 0x00000005,
0x00000000, 0x00000000, 0x01000000, 0x01020408,
0x08040201, 0x000f1133, 0x00000000, 0x00001f04,
0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
- 0x00000000, 0x00000000, 0x00010000, 0x00020304,
- 0x00000004, 0x00000000, 0x00000000, 0x00000000,
+ 0x00000000, 0x00000000, 0x00010000, 0x00030404,
+ 0x00000003, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x01010000,
0x01000000, 0x03030000, 0x00010303, 0x01020202,
0x00000000, 0x02040303, 0x21002103, 0x00061200,
- 0x06120612, 0x04320432, 0x04320432, 0x00040004,
+ 0x06120612, 0x04420442, 0x04420442, 0x00040004,
0x00040004, 0x00000000, 0x00000000, 0x00000000,
- 0x00000000, 0x00010001
+ 0x00000000, 0xffffffff
/*
* i.MX23 DDR at 133MHz
__weak void mxs_adjust_memory_params(uint32_t *dram_vals)
{
+ debug("SPL: Using default SDRAM parameters\n");
}
+#ifdef CONFIG_MX28
+static void initialize_dram_values(void)
+{
+ int i;
+
+ debug("SPL: Setting mx28 board specific SDRAM parameters\n");
+ mxs_adjust_memory_params(mxs_dram_vals);
+
+ debug("SPL: Applying SDRAM parameters\n");
+ for (i = 0; i < ARRAY_SIZE(mxs_dram_vals); i++)
+ writel(mxs_dram_vals[i], MXS_DRAM_BASE + (4 * i));
+}
+#else
static void initialize_dram_values(void)
{
int i;
- mxs_adjust_memory_params(dram_vals);
+ debug("SPL: Setting mx23 board specific SDRAM parameters\n");
+ mxs_adjust_memory_params(mxs_dram_vals);
- for (i = 0; i < ARRAY_SIZE(dram_vals); i++)
- writel(dram_vals[i], MXS_DRAM_BASE + (4 * i));
+ /*
+ * HW_DRAM_CTL27, HW_DRAM_CTL28 and HW_DRAM_CTL35 are not initialized as
+ * per FSL bootlets code.
+ *
+ * mx23 Reference Manual marks HW_DRAM_CTL27 and HW_DRAM_CTL28 as
+ * "reserved".
+ * HW_DRAM_CTL8 is setup as the last element.
+ * So skip the initialization of these HW_DRAM_CTL registers.
+ */
+ debug("SPL: Applying SDRAM parameters\n");
+ for (i = 0; i < ARRAY_SIZE(mxs_dram_vals); i++) {
+ if (i == 8 || i == 27 || i == 28 || i == 35)
+ continue;
+ writel(mxs_dram_vals[i], MXS_DRAM_BASE + (4 * i));
+ }
-#ifdef CONFIG_MX23
/*
* Enable tRAS lockout in HW_DRAM_CTL08 ; it must be the last
* element to be set
*/
writel((1 << 24), MXS_DRAM_BASE + (4 * 8));
-#endif
}
+#endif
static void mxs_mem_init_clock(void)
{
const unsigned char divider = 21;
#endif
+ debug("SPL: Initialising FRAC0\n");
+
/* Gate EMI clock */
writeb(CLKCTRL_FRAC_CLKGATE,
&clkctrl_regs->hw_clkctrl_frac0_set[CLKCTRL_FRAC0_EMI]);
&clkctrl_regs->hw_clkctrl_clkseq_clr);
early_delay(10000);
+ debug("SPL: FRAC0 Initialised\n");
}
static void mxs_mem_setup_cpu_and_hbus(void)
struct mxs_clkctrl_regs *clkctrl_regs =
(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
+ debug("SPL: Setting CPU and HBUS clock frequencies\n");
+
/* Set fractional divider for ref_cpu to 480 * 18 / 19 = 454MHz
* and ungate CPU clock */
writeb(19 & CLKCTRL_FRAC_FRAC_MASK,
struct mxs_power_regs *power_regs =
(struct mxs_power_regs *)MXS_POWER_BASE;
+ debug("SPL: Configuring VDDA\n");
+
writel((0xc << POWER_VDDACTRL_TRG_OFFSET) |
(0x7 << POWER_VDDACTRL_BO_OFFSET_OFFSET) |
POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW,
struct mxs_power_regs *power_regs =
(struct mxs_power_regs *)MXS_POWER_BASE;
- writel((0x10 << POWER_VDDMEMCTRL_TRG_OFFSET) |
- POWER_VDDMEMCTRL_ENABLE_ILIMIT |
- POWER_VDDMEMCTRL_ENABLE_LINREG |
- POWER_VDDMEMCTRL_PULLDOWN_ACTIVE,
- &power_regs->hw_power_vddmemctrl);
+ debug("SPL: Setting mx23 VDDMEM\n");
+
+ /* We must wait before and after disabling the current limiter! */
+ early_delay(10000);
+
+ clrbits_le32(&power_regs->hw_power_vddmemctrl,
+ POWER_VDDMEMCTRL_ENABLE_ILIMIT);
early_delay(10000);
- writel((0x10 << POWER_VDDMEMCTRL_TRG_OFFSET) |
- POWER_VDDMEMCTRL_ENABLE_LINREG,
- &power_regs->hw_power_vddmemctrl);
}
static void mx23_mem_init(void)
{
+ debug("SPL: Initialising mx23 SDRAM Controller\n");
+
/*
* Reset/ungate the EMI block. This is essential, otherwise the system
* suffers from memory instability. This thing is mx23 specific and is
initialize_dram_values();
- /* Set START bit in DRAM_CTL16 */
+ /* Set START bit in DRAM_CTL8 */
setbits_le32(MXS_DRAM_BASE + 0x20, 1 << 16);
clrbits_le32(MXS_DRAM_BASE + 0x40, 1 << 17);
- early_delay(20000);
+
+ /* Wait for EMI_STAT bit DRAM_HALTED */
+ for (;;) {
+ if (!(readl(MXS_EMI_BASE + 0x10) & (1 << 1)))
+ break;
+ early_delay(1000);
+ }
/* Adjust EMI port priority. */
- clrsetbits_le32(0x80020000, 0x1f << 16, 0x8);
+ clrsetbits_le32(0x80020000, 0x1f << 16, 0x2);
early_delay(20000);
setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 19);
setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 11);
-
- /* Wait for bit 10 (DRAM init complete) in DRAM_CTL18 */
- while (!(readl(MXS_DRAM_BASE + 0x48) & (1 << 10)))
- ;
}
#endif
struct mxs_pinctrl_regs *pinctrl_regs =
(struct mxs_pinctrl_regs *)MXS_PINCTRL_BASE;
+ debug("SPL: Initialising mx28 SDRAM Controller\n");
+
/* Set DDR2 mode */
writel(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
&pinctrl_regs->hw_pinctrl_emi_ds_ctrl_set);
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