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https://github.com/AsahiLinux/u-boot
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dd3ecf020e
The VDDMEM ramped up in very weird way as it was horribly misconfigured.
Instead of setting up VDDMEM in one swipe, let it rise slowly the same
way as VDDD and VDDA in spl_power_init.c and then only clear ILIMIT before
memory gets inited. This makes sure the VDDMEM rises sanely, not jumps up
and down as it did till now.
The VDDMEM prior to this change did this:
2V0____ .--------2V5
| `--'
0V____|
The VDDMEM now does this:
2V0_____,-----------2V5
/
0V__|
Moreover, VDDIO on MX23 uses 25mV steps while MX28 uses 50mV steps,
fix this difference too.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>
347 lines
9.6 KiB
C
347 lines
9.6 KiB
C
/*
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* Freescale i.MX28 RAM init
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*
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* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
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* on behalf of DENX Software Engineering GmbH
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <config.h>
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#include <asm/io.h>
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#include <asm/arch/imx-regs.h>
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#include <asm/arch/sys_proto.h>
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#include <linux/compiler.h>
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#include "mxs_init.h"
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static uint32_t dram_vals[] = {
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/*
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* i.MX28 DDR2 at 200MHz
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*/
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#if defined(CONFIG_MX28)
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000100, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00010101, 0x01010101,
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0x000f0f01, 0x0f02020a, 0x00000000, 0x00010101,
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0x00000100, 0x00000100, 0x00000000, 0x00000002,
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0x01010000, 0x07080403, 0x06005003, 0x0a0000c8,
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0x02009c40, 0x0002030c, 0x0036a609, 0x031a0612,
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0x02030202, 0x00c8001c, 0x00000000, 0x00000000,
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0x00012100, 0xffff0303, 0x00012100, 0xffff0303,
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0x00012100, 0xffff0303, 0x00012100, 0xffff0303,
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0x00000003, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000612, 0x01000F02,
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0x06120612, 0x00000200, 0x00020007, 0xf4004a27,
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0xf4004a27, 0xf4004a27, 0xf4004a27, 0x07000300,
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0x07000300, 0x07400300, 0x07400300, 0x00000005,
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0x00000000, 0x00000000, 0x01000000, 0x01020408,
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0x08040201, 0x000f1133, 0x00000000, 0x00001f04,
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0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04,
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0x00001f04, 0x00001f04, 0x00001f04, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00010000, 0x00030404,
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0x00000003, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x01010000,
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0x01000000, 0x03030000, 0x00010303, 0x01020202,
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0x00000000, 0x02040303, 0x21002103, 0x00061200,
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0x06120612, 0x04420442, 0x04420442, 0x00040004,
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0x00040004, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0xffffffff
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/*
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* i.MX23 DDR at 133MHz
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*/
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#elif defined(CONFIG_MX23)
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0x01010001, 0x00010100, 0x01000101, 0x00000001,
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0x00000101, 0x00000000, 0x00010000, 0x01000001,
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0x00000000, 0x00000001, 0x07000200, 0x00070202,
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0x02020000, 0x04040a01, 0x00000201, 0x02040000,
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0x02000000, 0x19000f08, 0x0d0d0000, 0x02021313,
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0x02061521, 0x0000000a, 0x00080008, 0x00200020,
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0x00200020, 0x00200020, 0x000003f7, 0x00000000,
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0x00000000, 0x00000020, 0x00000020, 0x00c80000,
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0x000a23cd, 0x000000c8, 0x00006665, 0x00000000,
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0x00000101, 0x00040001, 0x00000000, 0x00000000,
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0x00010000
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#else
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#error Unsupported memory initialization
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#endif
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};
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__weak void mxs_adjust_memory_params(uint32_t *dram_vals)
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{
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}
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#ifdef CONFIG_MX28
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static void initialize_dram_values(void)
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{
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int i;
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mxs_adjust_memory_params(dram_vals);
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for (i = 0; i < ARRAY_SIZE(dram_vals); i++)
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writel(dram_vals[i], MXS_DRAM_BASE + (4 * i));
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}
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#else
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static void initialize_dram_values(void)
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{
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int i;
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mxs_adjust_memory_params(dram_vals);
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/*
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* HW_DRAM_CTL27, HW_DRAM_CTL28 and HW_DRAM_CTL35 are not initialized as
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* per FSL bootlets code.
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*
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* mx23 Reference Manual marks HW_DRAM_CTL27 and HW_DRAM_CTL28 as
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* "reserved".
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* HW_DRAM_CTL8 is setup as the last element.
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* So skip the initialization of these HW_DRAM_CTL registers.
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*/
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for (i = 0; i < ARRAY_SIZE(dram_vals); i++) {
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if (i == 8 || i == 27 || i == 28 || i == 35)
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continue;
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writel(dram_vals[i], MXS_DRAM_BASE + (4 * i));
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}
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/*
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* Enable tRAS lockout in HW_DRAM_CTL08 ; it must be the last
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* element to be set
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*/
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writel((1 << 24), MXS_DRAM_BASE + (4 * 8));
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}
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#endif
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static void mxs_mem_init_clock(void)
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{
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struct mxs_clkctrl_regs *clkctrl_regs =
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(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
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#if defined(CONFIG_MX23)
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/* Fractional divider for ref_emi is 33 ; 480 * 18 / 33 = 266MHz */
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const unsigned char divider = 33;
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#elif defined(CONFIG_MX28)
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/* Fractional divider for ref_emi is 21 ; 480 * 18 / 21 = 411MHz */
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const unsigned char divider = 21;
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#endif
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/* Gate EMI clock */
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writeb(CLKCTRL_FRAC_CLKGATE,
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&clkctrl_regs->hw_clkctrl_frac0_set[CLKCTRL_FRAC0_EMI]);
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/* Set fractional divider for ref_emi */
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writeb(CLKCTRL_FRAC_CLKGATE | (divider & CLKCTRL_FRAC_FRAC_MASK),
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&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_EMI]);
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/* Ungate EMI clock */
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writeb(CLKCTRL_FRAC_CLKGATE,
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&clkctrl_regs->hw_clkctrl_frac0_clr[CLKCTRL_FRAC0_EMI]);
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early_delay(11000);
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/* Set EMI clock divider for EMI clock to 411 / 2 = 205MHz */
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writel((2 << CLKCTRL_EMI_DIV_EMI_OFFSET) |
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(1 << CLKCTRL_EMI_DIV_XTAL_OFFSET),
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&clkctrl_regs->hw_clkctrl_emi);
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/* Unbypass EMI */
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writel(CLKCTRL_CLKSEQ_BYPASS_EMI,
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&clkctrl_regs->hw_clkctrl_clkseq_clr);
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early_delay(10000);
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}
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static void mxs_mem_setup_cpu_and_hbus(void)
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{
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struct mxs_clkctrl_regs *clkctrl_regs =
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(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
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/* Set fractional divider for ref_cpu to 480 * 18 / 19 = 454MHz
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* and ungate CPU clock */
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writeb(19 & CLKCTRL_FRAC_FRAC_MASK,
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(uint8_t *)&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_CPU]);
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/* Set CPU bypass */
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writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
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&clkctrl_regs->hw_clkctrl_clkseq_set);
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/* HBUS = 151MHz */
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writel(CLKCTRL_HBUS_DIV_MASK, &clkctrl_regs->hw_clkctrl_hbus_set);
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writel(((~3) << CLKCTRL_HBUS_DIV_OFFSET) & CLKCTRL_HBUS_DIV_MASK,
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&clkctrl_regs->hw_clkctrl_hbus_clr);
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early_delay(10000);
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/* CPU clock divider = 1 */
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clrsetbits_le32(&clkctrl_regs->hw_clkctrl_cpu,
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CLKCTRL_CPU_DIV_CPU_MASK, 1);
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/* Disable CPU bypass */
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writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
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&clkctrl_regs->hw_clkctrl_clkseq_clr);
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early_delay(15000);
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}
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static void mxs_mem_setup_vdda(void)
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{
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struct mxs_power_regs *power_regs =
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(struct mxs_power_regs *)MXS_POWER_BASE;
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writel((0xc << POWER_VDDACTRL_TRG_OFFSET) |
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(0x7 << POWER_VDDACTRL_BO_OFFSET_OFFSET) |
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POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW,
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&power_regs->hw_power_vddactrl);
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}
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uint32_t mxs_mem_get_size(void)
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{
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uint32_t sz, da;
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uint32_t *vt = (uint32_t *)0x20;
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/* The following is "subs pc, r14, #4", used as return from DABT. */
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const uint32_t data_abort_memdetect_handler = 0xe25ef004;
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/* Replace the DABT handler. */
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da = vt[4];
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vt[4] = data_abort_memdetect_handler;
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sz = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE);
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/* Restore the old DABT handler. */
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vt[4] = da;
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return sz;
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}
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#ifdef CONFIG_MX23
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static void mx23_mem_setup_vddmem(void)
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{
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struct mxs_power_regs *power_regs =
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(struct mxs_power_regs *)MXS_POWER_BASE;
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clrbits_le32(&power_regs->hw_power_vddmemctrl,
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POWER_VDDMEMCTRL_ENABLE_ILIMIT);
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}
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static void mx23_mem_init(void)
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{
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/*
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* Reset/ungate the EMI block. This is essential, otherwise the system
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* suffers from memory instability. This thing is mx23 specific and is
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* no longer present on mx28.
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*/
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mxs_reset_block((struct mxs_register_32 *)MXS_EMI_BASE);
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mx23_mem_setup_vddmem();
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/*
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* Configure the DRAM registers
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*/
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/* Clear START and SREFRESH bit from DRAM_CTL8 */
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clrbits_le32(MXS_DRAM_BASE + 0x20, (1 << 16) | (1 << 8));
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initialize_dram_values();
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/* Set START bit in DRAM_CTL8 */
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setbits_le32(MXS_DRAM_BASE + 0x20, 1 << 16);
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clrbits_le32(MXS_DRAM_BASE + 0x40, 1 << 17);
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early_delay(20000);
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/* Adjust EMI port priority. */
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clrsetbits_le32(0x80020000, 0x1f << 16, 0x2);
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early_delay(20000);
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setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 19);
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setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 11);
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}
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#endif
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#ifdef CONFIG_MX28
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static void mx28_mem_init(void)
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{
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struct mxs_pinctrl_regs *pinctrl_regs =
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(struct mxs_pinctrl_regs *)MXS_PINCTRL_BASE;
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/* Set DDR2 mode */
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writel(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
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&pinctrl_regs->hw_pinctrl_emi_ds_ctrl_set);
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/*
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* Configure the DRAM registers
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*/
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/* Clear START bit from DRAM_CTL16 */
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clrbits_le32(MXS_DRAM_BASE + 0x40, 1);
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initialize_dram_values();
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/* Clear SREFRESH bit from DRAM_CTL17 */
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clrbits_le32(MXS_DRAM_BASE + 0x44, 1);
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/* Set START bit in DRAM_CTL16 */
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setbits_le32(MXS_DRAM_BASE + 0x40, 1);
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/* Wait for bit 20 (DRAM init complete) in DRAM_CTL58 */
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while (!(readl(MXS_DRAM_BASE + 0xe8) & (1 << 20)))
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;
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}
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#endif
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void mxs_mem_init(void)
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{
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early_delay(11000);
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mxs_mem_init_clock();
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mxs_mem_setup_vdda();
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#if defined(CONFIG_MX23)
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mx23_mem_init();
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#elif defined(CONFIG_MX28)
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mx28_mem_init();
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#endif
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early_delay(10000);
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mxs_mem_setup_cpu_and_hbus();
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}
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