mirror of
https://github.com/brain-hackers/u-boot-brain
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3a4ce8335b
This code allows the DDR DRAM size to be detected at runtime. The RAM size is stored into two scratch registers, from which it is then fetched in U-Boot. Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Cc: Stefano Babic <sbabic@denx.de> Cc: Wolfgang Denk <wd@denx.de> Cc: Detlev Zundel <dzu@denx.de>
241 lines
7.2 KiB
C
241 lines
7.2 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/iomux-mx28.h>
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#include <asm/arch/imx-regs.h>
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#include "m28_init.h"
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uint32_t dram_vals[] = {
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000100, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00010101, 0x01010101, 0x000f0f01, 0x0f02020a,
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0x00000000, 0x00010101, 0x00000100, 0x00000100, 0x00000000,
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0x00000002, 0x01010000, 0x05060302, 0x06005003, 0x0a0000c8,
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0x02009c40, 0x0000030c, 0x0036a609, 0x031a0612, 0x02030202,
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0x00c8001c, 0x00000000, 0x00000000, 0x00012100, 0xffff0303,
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0x00012100, 0xffff0303, 0x00012100, 0xffff0303, 0x00012100,
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0xffff0303, 0x00000003, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000612, 0x01000F02, 0x06120612, 0x00000200,
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0x00020007, 0xf5014b27, 0xf5014b27, 0xf5014b27, 0xf5014b27,
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0x07000300, 0x07000300, 0x07000300, 0x07000300, 0x00000006,
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0x00000000, 0x00000000, 0x01000000, 0x01020408, 0x08040201,
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0x000f1133, 0x00000000, 0x00001f04, 0x00001f04, 0x00001f04,
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0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00010000, 0x00020304, 0x00000004,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x01010000, 0x01000000, 0x03030000, 0x00010303,
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0x01020202, 0x00000000, 0x02040303, 0x21002103, 0x00061200,
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0x06120612, 0x04320432, 0x04320432, 0x00040004, 0x00040004,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00010001
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};
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void init_m28_200mhz_ddr2(void)
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{
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int i;
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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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void mx28_mem_init_clock(void)
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{
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struct mx28_clkctrl_regs *clkctrl_regs =
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(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
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/* Gate EMI clock */
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writel(CLKCTRL_FRAC0_CLKGATEEMI,
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&clkctrl_regs->hw_clkctrl_frac0_set);
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/* EMI = 205MHz */
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writel(CLKCTRL_FRAC0_EMIFRAC_MASK,
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&clkctrl_regs->hw_clkctrl_frac0_set);
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writel((0x2a << CLKCTRL_FRAC0_EMIFRAC_OFFSET) &
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CLKCTRL_FRAC0_EMIFRAC_MASK,
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&clkctrl_regs->hw_clkctrl_frac0_clr);
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/* Ungate EMI clock */
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writel(CLKCTRL_FRAC0_CLKGATEEMI,
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&clkctrl_regs->hw_clkctrl_frac0_clr);
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early_delay(11000);
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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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void mx28_mem_setup_cpu_and_hbus(void)
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{
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struct mx28_clkctrl_regs *clkctrl_regs =
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(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
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/* CPU = 454MHz and ungate CPU clock */
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clrsetbits_le32(&clkctrl_regs->hw_clkctrl_frac0,
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CLKCTRL_FRAC0_CPUFRAC_MASK | CLKCTRL_FRAC0_CLKGATECPU,
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19 << CLKCTRL_FRAC0_CPUFRAC_OFFSET);
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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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}
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void mx28_mem_setup_vdda(void)
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{
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struct mx28_power_regs *power_regs =
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(struct mx28_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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void mx28_mem_setup_vddd(void)
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{
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struct mx28_power_regs *power_regs =
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(struct mx28_power_regs *)MXS_POWER_BASE;
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writel((0x1c << POWER_VDDDCTRL_TRG_OFFSET) |
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(0x7 << POWER_VDDDCTRL_BO_OFFSET_OFFSET) |
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POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW,
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&power_regs->hw_power_vdddctrl);
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}
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#define HW_DIGCTRL_SCRATCH0 0x8001c280
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#define HW_DIGCTRL_SCRATCH1 0x8001c290
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void data_abort_memdetect_handler(void) __attribute__((naked));
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void data_abort_memdetect_handler(void)
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{
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asm volatile("subs pc, r14, #4");
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}
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void mx28_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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/* Replace the DABT handler. */
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da = vt[4];
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vt[4] = (uint32_t)&data_abort_memdetect_handler;
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sz = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE);
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writel(sz, HW_DIGCTRL_SCRATCH0);
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writel(sz, HW_DIGCTRL_SCRATCH1);
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/* Restore the old DABT handler. */
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vt[4] = da;
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}
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void mx28_mem_init(void)
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{
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struct mx28_clkctrl_regs *clkctrl_regs =
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(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
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struct mx28_pinctrl_regs *pinctrl_regs =
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(struct mx28_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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/* Power up PLL0 */
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writel(CLKCTRL_PLL0CTRL0_POWER,
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&clkctrl_regs->hw_clkctrl_pll0ctrl0_set);
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early_delay(11000);
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mx28_mem_init_clock();
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mx28_mem_setup_vdda();
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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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init_m28_200mhz_ddr2();
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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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mx28_mem_setup_vddd();
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early_delay(10000);
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mx28_mem_setup_cpu_and_hbus();
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mx28_mem_get_size();
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}
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