u-boot/arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c
Mikhail Kshevetskiy 89473d233f arm/davinci: fix DDR2/mDDR memory controller initialization for Omap L138
follow section 15.2.13.1 (Initializing Following Device Power Up or Reset) of
OMAP-L138 DSP+ARM Processor Technical Reference Manual

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@gmail.com>
Acked-by: Christian Riesch <christian.riesch@omicron.at>
Tested-by: Christian Riesch <christian.riesch@omicron.at>
2012-09-01 14:58:10 +02:00

316 lines
9.1 KiB
C

/*
* SoC-specific lowlevel code for DA850
*
* Copyright (C) 2011
* Heiko Schocher, DENX Software Engineering, hs@denx.de.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <common.h>
#include <nand.h>
#include <ns16550.h>
#include <post.h>
#include <asm/arch/da850_lowlevel.h>
#include <asm/arch/hardware.h>
#include <asm/arch/davinci_misc.h>
#include <asm/arch/ddr2_defs.h>
#include <asm/arch/emif_defs.h>
#include <asm/arch/pll_defs.h>
#if defined(CONFIG_SYS_DA850_PLL_INIT)
void da850_waitloop(unsigned long loopcnt)
{
unsigned long i;
for (i = 0; i < loopcnt; i++)
asm(" NOP");
}
int da850_pll_init(struct davinci_pllc_regs *reg, unsigned long pllmult)
{
if (reg == davinci_pllc0_regs)
/* Unlock PLL registers. */
clrbits_le32(&davinci_syscfg_regs->cfgchip0, PLL_MASTER_LOCK);
/*
* Set PLLENSRC '0',bit 5, PLL Enable(PLLEN) selection is controlled
* through MMR
*/
clrbits_le32(&reg->pllctl, PLLCTL_PLLENSRC);
/* PLLCTL.EXTCLKSRC bit 9 should be left at 0 for Freon */
clrbits_le32(&reg->pllctl, PLLCTL_EXTCLKSRC);
/* Set PLLEN=0 => PLL BYPASS MODE */
clrbits_le32(&reg->pllctl, PLLCTL_PLLEN);
da850_waitloop(150);
if (reg == davinci_pllc0_regs) {
/*
* Select the Clock Mode bit 8 as External Clock or On Chip
* Oscilator
*/
dv_maskbits(&reg->pllctl, ~PLLCTL_RES_9);
setbits_le32(&reg->pllctl,
(CONFIG_SYS_DV_CLKMODE << PLLCTL_CLOCK_MODE_SHIFT));
}
/* Clear PLLRST bit to reset the PLL */
clrbits_le32(&reg->pllctl, PLLCTL_PLLRST);
/* Disable the PLL output */
setbits_le32(&reg->pllctl, PLLCTL_PLLDIS);
/* PLL initialization sequence */
/*
* Power up the PLL- PWRDN bit set to 0 to bring the PLL out of
* power down bit
*/
clrbits_le32(&reg->pllctl, PLLCTL_PLLPWRDN);
/* Enable the PLL from Disable Mode PLLDIS bit to 0 */
clrbits_le32(&reg->pllctl, PLLCTL_PLLDIS);
#if defined(CONFIG_SYS_DA850_PLL0_PREDIV)
/* program the prediv */
if (reg == davinci_pllc0_regs && CONFIG_SYS_DA850_PLL0_PREDIV)
writel((PLL_DIVEN | CONFIG_SYS_DA850_PLL0_PREDIV),
&reg->prediv);
#endif
/* Program the required multiplier value in PLLM */
writel(pllmult, &reg->pllm);
/* program the postdiv */
if (reg == davinci_pllc0_regs)
writel((PLL_POSTDEN | CONFIG_SYS_DA850_PLL0_POSTDIV),
&reg->postdiv);
else
writel((PLL_POSTDEN | CONFIG_SYS_DA850_PLL1_POSTDIV),
&reg->postdiv);
/*
* Check for the GOSTAT bit in PLLSTAT to clear to 0 to indicate that
* no GO operation is currently in progress
*/
while ((readl(&reg->pllstat) & PLLCMD_GOSTAT) == PLLCMD_GOSTAT)
;
if (reg == davinci_pllc0_regs) {
writel(CONFIG_SYS_DA850_PLL0_PLLDIV1, &reg->plldiv1);
writel(CONFIG_SYS_DA850_PLL0_PLLDIV2, &reg->plldiv2);
writel(CONFIG_SYS_DA850_PLL0_PLLDIV3, &reg->plldiv3);
writel(CONFIG_SYS_DA850_PLL0_PLLDIV4, &reg->plldiv4);
writel(CONFIG_SYS_DA850_PLL0_PLLDIV5, &reg->plldiv5);
writel(CONFIG_SYS_DA850_PLL0_PLLDIV6, &reg->plldiv6);
writel(CONFIG_SYS_DA850_PLL0_PLLDIV7, &reg->plldiv7);
} else {
writel(CONFIG_SYS_DA850_PLL1_PLLDIV1, &reg->plldiv1);
writel(CONFIG_SYS_DA850_PLL1_PLLDIV2, &reg->plldiv2);
writel(CONFIG_SYS_DA850_PLL1_PLLDIV3, &reg->plldiv3);
}
/*
* Set the GOSET bit in PLLCMD to 1 to initiate a new divider
* transition.
*/
setbits_le32(&reg->pllcmd, PLLCMD_GOSTAT);
/*
* Wait for the GOSTAT bit in PLLSTAT to clear to 0
* (completion of phase alignment).
*/
while ((readl(&reg->pllstat) & PLLCMD_GOSTAT) == PLLCMD_GOSTAT)
;
/* Wait for PLL to reset properly. See PLL spec for PLL reset time */
da850_waitloop(200);
/* Set the PLLRST bit in PLLCTL to 1 to bring the PLL out of reset */
setbits_le32(&reg->pllctl, PLLCTL_PLLRST);
/* Wait for PLL to lock. See PLL spec for PLL lock time */
da850_waitloop(2400);
/*
* Set the PLLEN bit in PLLCTL to 1 to remove the PLL from bypass
* mode
*/
setbits_le32(&reg->pllctl, PLLCTL_PLLEN);
/*
* clear EMIFA and EMIFB clock source settings, let them
* run off SYSCLK
*/
if (reg == davinci_pllc0_regs)
dv_maskbits(&davinci_syscfg_regs->cfgchip3,
~(PLL_SCSCFG3_DIV45PENA | PLL_SCSCFG3_EMA_CLKSRC));
return 0;
}
#endif /* CONFIG_SYS_DA850_PLL_INIT */
#if defined(CONFIG_SYS_DA850_DDR_INIT)
int da850_ddr_setup(void)
{
unsigned long tmp;
/* Enable the Clock to DDR2/mDDR */
lpsc_on(DAVINCI_LPSC_DDR_EMIF);
tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);
if ((tmp & VTP_POWERDWN) == VTP_POWERDWN) {
/* Begin VTP Calibration */
clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_POWERDWN);
clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_LOCK);
setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);
clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);
setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);
/* Polling READY bit to see when VTP calibration is done */
tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);
while ((tmp & VTP_READY) != VTP_READY)
tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);
setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_LOCK);
setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_POWERDWN);
}
setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_IOPWRDWN);
writel(CONFIG_SYS_DA850_DDR2_DDRPHYCR, &dv_ddr2_regs_ctrl->ddrphycr);
if (CONFIG_SYS_DA850_DDR2_SDBCR & (1 << DV_DDR_SDCR_DDR2EN_SHIFT)) {
/* DDR2 */
clrbits_le32(&davinci_syscfg1_regs->ddr_slew,
(1 << DDR_SLEW_DDR_PDENA_BIT) |
(1 << DDR_SLEW_CMOSEN_BIT));
} else {
/* MOBILE DDR */
setbits_le32(&davinci_syscfg1_regs->ddr_slew,
(1 << DDR_SLEW_DDR_PDENA_BIT) |
(1 << DDR_SLEW_CMOSEN_BIT));
}
/*
* SDRAM Configuration Register (SDCR):
* First set the BOOTUNLOCK bit to make configuration bits
* writeable.
*/
setbits_le32(&dv_ddr2_regs_ctrl->sdbcr, DV_DDR_BOOTUNLOCK);
/*
* Write the new value of these bits and clear BOOTUNLOCK.
* At the same time, set the TIMUNLOCK bit to allow changing
* the timing registers
*/
tmp = CONFIG_SYS_DA850_DDR2_SDBCR;
tmp &= ~DV_DDR_BOOTUNLOCK;
tmp |= DV_DDR_TIMUNLOCK;
writel(tmp, &dv_ddr2_regs_ctrl->sdbcr);
/* write memory configuration and timing */
if (!(CONFIG_SYS_DA850_DDR2_SDBCR & (1 << DV_DDR_SDCR_DDR2EN_SHIFT))) {
/* MOBILE DDR only*/
writel(CONFIG_SYS_DA850_DDR2_SDBCR2,
&dv_ddr2_regs_ctrl->sdbcr2);
}
writel(CONFIG_SYS_DA850_DDR2_SDTIMR, &dv_ddr2_regs_ctrl->sdtimr);
writel(CONFIG_SYS_DA850_DDR2_SDTIMR2, &dv_ddr2_regs_ctrl->sdtimr2);
/* clear the TIMUNLOCK bit and write the value of the CL field */
tmp &= ~DV_DDR_TIMUNLOCK;
writel(tmp, &dv_ddr2_regs_ctrl->sdbcr);
/*
* LPMODEN and MCLKSTOPEN must be set!
* Without this bits set, PSC don;t switch states !!
*/
writel(CONFIG_SYS_DA850_DDR2_SDRCR |
(1 << DV_DDR_SRCR_LPMODEN_SHIFT) |
(1 << DV_DDR_SRCR_MCLKSTOPEN_SHIFT),
&dv_ddr2_regs_ctrl->sdrcr);
/* SyncReset the Clock to EMIF3A SDRAM */
lpsc_syncreset(DAVINCI_LPSC_DDR_EMIF);
/* Enable the Clock to EMIF3A SDRAM */
lpsc_on(DAVINCI_LPSC_DDR_EMIF);
/* disable self refresh */
clrbits_le32(&dv_ddr2_regs_ctrl->sdrcr,
DV_DDR_SDRCR_LPMODEN | DV_DDR_SDRCR_MCLKSTOPEN);
writel(CONFIG_SYS_DA850_DDR2_PBBPR, &dv_ddr2_regs_ctrl->pbbpr);
return 0;
}
#endif /* CONFIG_SYS_DA850_DDR_INIT */
__attribute__((weak))
void board_gpio_init(void)
{
return;
}
int arch_cpu_init(void)
{
/* Unlock kick registers */
writel(DV_SYSCFG_KICK0_UNLOCK, &davinci_syscfg_regs->kick0);
writel(DV_SYSCFG_KICK1_UNLOCK, &davinci_syscfg_regs->kick1);
dv_maskbits(&davinci_syscfg_regs->suspsrc,
CONFIG_SYS_DA850_SYSCFG_SUSPSRC);
/* configure pinmux settings */
if (davinci_configure_pin_mux_items(pinmuxes, pinmuxes_size))
return 1;
#if defined(CONFIG_SYS_DA850_PLL_INIT)
/* PLL setup */
da850_pll_init(davinci_pllc0_regs, CONFIG_SYS_DA850_PLL0_PLLM);
da850_pll_init(davinci_pllc1_regs, CONFIG_SYS_DA850_PLL1_PLLM);
#endif
/* setup CSn config */
#if defined(CONFIG_SYS_DA850_CS2CFG)
writel(CONFIG_SYS_DA850_CS2CFG, &davinci_emif_regs->ab1cr);
#endif
#if defined(CONFIG_SYS_DA850_CS3CFG)
writel(CONFIG_SYS_DA850_CS3CFG, &davinci_emif_regs->ab2cr);
#endif
da8xx_configure_lpsc_items(lpsc, lpsc_size);
/* GPIO setup */
board_gpio_init();
NS16550_init((NS16550_t)(CONFIG_SYS_NS16550_COM1),
CONFIG_SYS_NS16550_CLK / 16 / CONFIG_BAUDRATE);
/*
* Fix Power and Emulation Management Register
* see sprufw3a.pdf page 37 Table 24
*/
writel((DAVINCI_UART_PWREMU_MGMT_FREE | DAVINCI_UART_PWREMU_MGMT_URRST |
DAVINCI_UART_PWREMU_MGMT_UTRST),
&davinci_uart2_ctrl_regs->pwremu_mgmt);
#if defined(CONFIG_SYS_DA850_DDR_INIT)
da850_ddr_setup();
#endif
return 0;
}