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/*
* 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 <asm/io.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/sys_proto.h>
#include <linux/compiler.h>
#include "mxs_init.h"
static uint32_t dram_vals[] = {
/*
* i.MX28 DDR2 at 200MHz
*/
#if defined(CONFIG_MX28)
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000100, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00010101, 0x01010101,
0x000f0f01, 0x0f02020a, 0x00000000, 0x00010101,
0x00000100, 0x00000100, 0x00000000, 0x00000002,
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, 0xf4004a27,
0xf4004a27, 0xf4004a27, 0xf4004a27, 0x07000300,
0x07000300, 0x07400300, 0x07400300, 0x00000005,
0x00000000, 0x00000000, 0x01000000, 0x01020408,
0x08040201, 0x000f1133, 0x00000000, 0x00001f04,
0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04,
0x00001f04, 0x00001f04, 0x00001f04, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00010000, 0x00030404,
0x00000003, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x01010000,
0x01000000, 0x03030000, 0x00010303, 0x01020202,
0x00000000, 0x02040303, 0x21002103, 0x00061200,
0x06120612, 0x04420442, 0x04420442, 0x00040004,
0x00040004, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0xffffffff
/*
* i.MX23 DDR at 133MHz
*/
#elif defined(CONFIG_MX23)
0x01010001, 0x00010100, 0x01000101, 0x00000001,
0x00000101, 0x00000000, 0x00010000, 0x01000001,
0x00000000, 0x00000001, 0x07000200, 0x00070202,
0x02020000, 0x04040a01, 0x00000201, 0x02040000,
0x02000000, 0x19000f08, 0x0d0d0000, 0x02021313,
0x02061521, 0x0000000a, 0x00080008, 0x00200020,
0x00200020, 0x00200020, 0x000003f7, 0x00000000,
0x00000000, 0x00000020, 0x00000020, 0x00c80000,
0x000a23cd, 0x000000c8, 0x00006665, 0x00000000,
0x00000101, 0x00040001, 0x00000000, 0x00000000,
0x00010000
#else
#error Unsupported memory initialization
#endif
};
__weak void mxs_adjust_memory_params(uint32_t *dram_vals)
{
}
static void initialize_dram_values(void)
{
int i;
mxs_adjust_memory_params(dram_vals);
for (i = 0; i < ARRAY_SIZE(dram_vals); i++)
writel(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
}
static void mxs_mem_init_clock(void)
{
struct mxs_clkctrl_regs *clkctrl_regs =
(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
#if defined(CONFIG_MX23)
/* Fractional divider for ref_emi is 33 ; 480 * 18 / 33 = 266MHz */
const unsigned char divider = 33;
#elif defined(CONFIG_MX28)
/* Fractional divider for ref_emi is 21 ; 480 * 18 / 21 = 411MHz */
const unsigned char divider = 21;
#endif
/* Gate EMI clock */
writeb(CLKCTRL_FRAC_CLKGATE,
&clkctrl_regs->hw_clkctrl_frac0_set[CLKCTRL_FRAC0_EMI]);
/* Set fractional divider for ref_emi */
writeb(CLKCTRL_FRAC_CLKGATE | (divider & CLKCTRL_FRAC_FRAC_MASK),
&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_EMI]);
/* Ungate EMI clock */
writeb(CLKCTRL_FRAC_CLKGATE,
&clkctrl_regs->hw_clkctrl_frac0_clr[CLKCTRL_FRAC0_EMI]);
early_delay(11000);
/* Set EMI clock divider for EMI clock to 411 / 2 = 205MHz */
writel((2 << CLKCTRL_EMI_DIV_EMI_OFFSET) |
(1 << CLKCTRL_EMI_DIV_XTAL_OFFSET),
&clkctrl_regs->hw_clkctrl_emi);
/* Unbypass EMI */
writel(CLKCTRL_CLKSEQ_BYPASS_EMI,
&clkctrl_regs->hw_clkctrl_clkseq_clr);
early_delay(10000);
}
static void mxs_mem_setup_cpu_and_hbus(void)
{
struct mxs_clkctrl_regs *clkctrl_regs =
(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
/* Set fractional divider for ref_cpu to 480 * 18 / 19 = 454MHz
* and ungate CPU clock */
writeb(19 & CLKCTRL_FRAC_FRAC_MASK,
(uint8_t *)&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_CPU]);
/* Set CPU bypass */
writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
&clkctrl_regs->hw_clkctrl_clkseq_set);
/* HBUS = 151MHz */
writel(CLKCTRL_HBUS_DIV_MASK, &clkctrl_regs->hw_clkctrl_hbus_set);
writel(((~3) << CLKCTRL_HBUS_DIV_OFFSET) & CLKCTRL_HBUS_DIV_MASK,
&clkctrl_regs->hw_clkctrl_hbus_clr);
early_delay(10000);
/* CPU clock divider = 1 */
clrsetbits_le32(&clkctrl_regs->hw_clkctrl_cpu,
CLKCTRL_CPU_DIV_CPU_MASK, 1);
/* Disable CPU bypass */
writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
&clkctrl_regs->hw_clkctrl_clkseq_clr);
early_delay(15000);
}
static void mxs_mem_setup_vdda(void)
{
struct mxs_power_regs *power_regs =
(struct mxs_power_regs *)MXS_POWER_BASE;
writel((0xc << POWER_VDDACTRL_TRG_OFFSET) |
(0x7 << POWER_VDDACTRL_BO_OFFSET_OFFSET) |
POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW,
&power_regs->hw_power_vddactrl);
}
uint32_t mxs_mem_get_size(void)
{
uint32_t sz, da;
uint32_t *vt = (uint32_t *)0x20;
/* The following is "subs pc, r14, #4", used as return from DABT. */
const uint32_t data_abort_memdetect_handler = 0xe25ef004;
/* Replace the DABT handler. */
da = vt[4];
vt[4] = data_abort_memdetect_handler;
sz = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE);
/* Restore the old DABT handler. */
vt[4] = da;
return sz;
}
#ifdef CONFIG_MX23
static void mx23_mem_setup_vddmem(void)
{
struct mxs_power_regs *power_regs =
(struct mxs_power_regs *)MXS_POWER_BASE;
writel((0x12 << POWER_VDDMEMCTRL_TRG_OFFSET) |
POWER_VDDMEMCTRL_ENABLE_ILIMIT |
POWER_VDDMEMCTRL_ENABLE_LINREG |
POWER_VDDMEMCTRL_PULLDOWN_ACTIVE,
&power_regs->hw_power_vddmemctrl);
early_delay(10000);
writel((0x12 << POWER_VDDMEMCTRL_TRG_OFFSET) |
POWER_VDDMEMCTRL_ENABLE_LINREG,
&power_regs->hw_power_vddmemctrl);
}
static void mx23_mem_init(void)
{
/*
* Reset/ungate the EMI block. This is essential, otherwise the system
* suffers from memory instability. This thing is mx23 specific and is
* no longer present on mx28.
*/
mxs_reset_block((struct mxs_register_32 *)MXS_EMI_BASE);
mx23_mem_setup_vddmem();
/*
* Configure the DRAM registers
*/
/* Clear START and SREFRESH bit from DRAM_CTL8 */
clrbits_le32(MXS_DRAM_BASE + 0x20, (1 << 16) | (1 << 8));
initialize_dram_values();
/* 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);
/* Adjust EMI port priority. */
clrsetbits_le32(0x80020000, 0x1f << 16, 0x8);
early_delay(20000);
setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 19);
setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 11);
}
#endif
#ifdef CONFIG_MX28
static void mx28_mem_init(void)
{
struct mxs_pinctrl_regs *pinctrl_regs =
(struct mxs_pinctrl_regs *)MXS_PINCTRL_BASE;
/* Set DDR2 mode */
writel(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
&pinctrl_regs->hw_pinctrl_emi_ds_ctrl_set);
/*
* Configure the DRAM registers
*/
/* Clear START bit from DRAM_CTL16 */
clrbits_le32(MXS_DRAM_BASE + 0x40, 1);
initialize_dram_values();
/* Clear SREFRESH bit from DRAM_CTL17 */
clrbits_le32(MXS_DRAM_BASE + 0x44, 1);
/* Set START bit in DRAM_CTL16 */
setbits_le32(MXS_DRAM_BASE + 0x40, 1);
/* Wait for bit 20 (DRAM init complete) in DRAM_CTL58 */
while (!(readl(MXS_DRAM_BASE + 0xe8) & (1 << 20)))
;
}
#endif
void mxs_mem_init(void)
{
early_delay(11000);
mxs_mem_init_clock();
mxs_mem_setup_vdda();
#if defined(CONFIG_MX23)
mx23_mem_init();
#elif defined(CONFIG_MX28)
mx28_mem_init();
#endif
early_delay(10000);
mxs_mem_setup_cpu_and_hbus();
}
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