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89075d3f4f
Add a comment about the tRAS lockout setting of HW_DRAM_CTL08 to enable the 'Fast Auto Pre-Charge' found in the memory chip. The setting is applied after memory initialization and it is worth document it. Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
337 lines
9.4 KiB
C
337 lines
9.4 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, 0x05060302, 0x06005003, 0x0a0000c8,
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0x02009c40, 0x0000030c, 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, 0xf5014b27,
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0xf5014b27, 0xf5014b27, 0xf5014b27, 0x07000300,
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0x07000300, 0x07000300, 0x07000300, 0x00000006,
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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, 0x00020304,
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0x00000004, 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, 0x04320432, 0x04320432, 0x00040004,
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0x00040004, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00010001
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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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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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#ifdef CONFIG_MX23
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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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#endif
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}
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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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writel((0x10 << POWER_VDDMEMCTRL_TRG_OFFSET) |
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POWER_VDDMEMCTRL_ENABLE_ILIMIT |
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POWER_VDDMEMCTRL_ENABLE_LINREG |
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POWER_VDDMEMCTRL_PULLDOWN_ACTIVE,
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&power_regs->hw_power_vddmemctrl);
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early_delay(10000);
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writel((0x10 << POWER_VDDMEMCTRL_TRG_OFFSET) |
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POWER_VDDMEMCTRL_ENABLE_LINREG,
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&power_regs->hw_power_vddmemctrl);
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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_CTL16 */
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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, 0x8);
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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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/* Wait for bit 10 (DRAM init complete) in DRAM_CTL18 */
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while (!(readl(MXS_DRAM_BASE + 0x48) & (1 << 10)))
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;
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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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