u-boot/arch/arm/cpu/armv7/omap3/lowlevel_init.S

/*
 * Board specific setup info
 *
 * (C) Copyright 2008
 * Texas Instruments, <www.ti.com>
 *
 * Initial Code by:
 * Richard Woodruff <r-woodruff2@ti.com>
 * Syed Mohammed Khasim <khasim@ti.com>
 *
 * 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 <config.h>
#include <version.h>
#include <asm/arch/mem.h>
#include <asm/arch/clocks_omap3.h>

_TEXT_BASE:
	.word	TEXT_BASE	/* sdram load addr from config.mk */

#if !defined(CONFIG_SYS_NAND_BOOT) && !defined(CONFIG_SYS_NAND_BOOT)
/**************************************************************************
 * cpy_clk_code: relocates clock code into SRAM where its safer to execute
 * R1 = SRAM destination address.
 *************************************************************************/
.global cpy_clk_code
 cpy_clk_code:
	/* Copy DPLL code into SRAM */
	adr	r0, go_to_speed		/* get addr of clock setting code */
	mov	r2, #384		/* r2 size to copy (div by 32 bytes) */
	mov	r1, r1			/* r1 <- dest address (passed in) */
	add	r2, r2, r0		/* r2 <- source end address */
next2:
	ldmia	r0!, {r3 - r10}		/* copy from source address [r0] */
	stmia	r1!, {r3 - r10}		/* copy to   target address [r1] */
	cmp	r0, r2			/* until source end address [r2] */
	bne	next2
	mov	pc, lr			/* back to caller */

/* ***************************************************************************
 *  go_to_speed: -Moves to bypass, -Commits clock dividers, -puts dpll at speed
 *               -executed from SRAM.
 *  R0 = CM_CLKEN_PLL-bypass value
 *  R1 = CM_CLKSEL1_PLL-m, n, and divider values
 *  R2 = CM_CLKSEL_CORE-divider values
 *  R3 = CM_IDLEST_CKGEN - addr dpll lock wait
 *
 *  Note: If core unlocks/relocks and SDRAM is running fast already it gets
 *        confused.  A reset of the controller gets it back.  Taking away its
 *        L3 when its not in self refresh seems bad for it.  Normally, this
 *	  code runs from flash before SDR is init so that should be ok.
 ****************************************************************************/
.global go_to_speed
 go_to_speed:
	stmfd sp!, {r4 - r6}

	/* move into fast relock bypass */
	ldr	r4, pll_ctl_add
	str	r0, [r4]
wait1:
	ldr	r5, [r3]		/* get status */
	and	r5, r5, #0x1		/* isolate core status */
	cmp	r5, #0x1		/* still locked? */
	beq	wait1			/* if lock, loop */

	/* set new dpll dividers _after_ in bypass */
	ldr	r5, pll_div_add1
	str	r1, [r5]		/* set m, n, m2 */
	ldr	r5, pll_div_add2
	str	r2, [r5]		/* set l3/l4/.. dividers*/
	ldr	r5, pll_div_add3	/* wkup */
	ldr	r2, pll_div_val3	/* rsm val */
	str	r2, [r5]
	ldr	r5, pll_div_add4	/* gfx */
	ldr	r2, pll_div_val4
	str	r2, [r5]
	ldr	r5, pll_div_add5	/* emu */
	ldr	r2, pll_div_val5
	str	r2, [r5]

	/* now prepare GPMC (flash) for new dpll speed */
	/* flash needs to be stable when we jump back to it */
	ldr	r5, flash_cfg3_addr
	ldr	r2, flash_cfg3_val
	str	r2, [r5]
	ldr	r5, flash_cfg4_addr
	ldr	r2, flash_cfg4_val
	str	r2, [r5]
	ldr	r5, flash_cfg5_addr
	ldr	r2, flash_cfg5_val
	str	r2, [r5]
	ldr	r5, flash_cfg1_addr
	ldr	r2, [r5]
	orr	r2, r2, #0x3		/* up gpmc divider */
	str	r2, [r5]

	/* lock DPLL3 and wait a bit */
	orr	r0, r0, #0x7	/* set up for lock mode */
	str	r0, [r4]	/* lock */
	nop			/* ARM slow at this point working at sys_clk */
	nop
	nop
	nop
wait2:
	ldr	r5, [r3]	/* get status */
	and	r5, r5, #0x1	/* isolate core status */
	cmp	r5, #0x1	/* still locked? */
	bne	wait2		/* if lock, loop */
	nop
	nop
	nop
	nop
	ldmfd	sp!, {r4 - r6}
	mov	pc, lr		/* back to caller, locked */

_go_to_speed: .word go_to_speed

/* these constants need to be close for PIC code */
/* The Nor has to be in the Flash Base CS0 for this condition to happen */
flash_cfg1_addr:
	.word (GPMC_CONFIG_CS0_BASE + GPMC_CONFIG1)
flash_cfg3_addr:
	.word (GPMC_CONFIG_CS0_BASE + GPMC_CONFIG3)
flash_cfg3_val:
	.word STNOR_GPMC_CONFIG3
flash_cfg4_addr:
	.word (GPMC_CONFIG_CS0_BASE + GPMC_CONFIG4)
flash_cfg4_val:
	.word STNOR_GPMC_CONFIG4
flash_cfg5_val:
	.word STNOR_GPMC_CONFIG5
flash_cfg5_addr:
	.word (GPMC_CONFIG_CS0_BASE + GPMC_CONFIG5)
pll_ctl_add:
	.word CM_CLKEN_PLL
pll_div_add1:
	.word CM_CLKSEL1_PLL
pll_div_add2:
	.word CM_CLKSEL_CORE
pll_div_add3:
	.word CM_CLKSEL_WKUP
pll_div_val3:
	.word (WKUP_RSM << 1)
pll_div_add4:
	.word CM_CLKSEL_GFX
pll_div_val4:
	.word (GFX_DIV << 0)
pll_div_add5:
	.word CM_CLKSEL1_EMU
pll_div_val5:
	.word CLSEL1_EMU_VAL

#endif

.globl lowlevel_init
lowlevel_init:
	ldr	sp, SRAM_STACK
	str	ip, [sp]	/* stash old link register */
	mov	ip, lr		/* save link reg across call */
	bl	s_init		/* go setup pll, mux, memory */
	ldr	ip, [sp]	/* restore save ip */
	mov	lr, ip		/* restore link reg */

	/* back to arch calling code */
	mov	pc, lr

	/* the literal pools origin */
	.ltorg

REG_CONTROL_STATUS:
	.word CONTROL_STATUS
SRAM_STACK:
	.word LOW_LEVEL_SRAM_STACK

/* DPLL(1-4) PARAM TABLES */

/*
 * Each of the tables has M, N, FREQSEL, M2 values defined for nominal
 * OPP (1.2V). The fields are defined according to dpll_param struct (clock.c).
 * The values are defined for all possible sysclk and for ES1 and ES2.
 */

mpu_dpll_param:
/* 12MHz */
/* ES1 */
.word MPU_M_12_ES1, MPU_N_12_ES1, MPU_FSEL_12_ES1, MPU_M2_12_ES1
/* ES2 */
.word MPU_M_12_ES2, MPU_N_12_ES2, MPU_FSEL_12_ES2, MPU_M2_ES2
/* 3410 */
.word MPU_M_12, MPU_N_12, MPU_FSEL_12, MPU_M2_12

/* 13MHz */
/* ES1 */
.word MPU_M_13_ES1, MPU_N_13_ES1, MPU_FSEL_13_ES1, MPU_M2_13_ES1
/* ES2 */
.word MPU_M_13_ES2, MPU_N_13_ES2, MPU_FSEL_13_ES2, MPU_M2_13_ES2
/* 3410 */
.word MPU_M_13, MPU_N_13, MPU_FSEL_13, MPU_M2_13

/* 19.2MHz */
/* ES1 */
.word MPU_M_19P2_ES1, MPU_N_19P2_ES1, MPU_FSEL_19P2_ES1, MPU_M2_19P2_ES1
/* ES2 */
.word MPU_M_19P2_ES2, MPU_N_19P2_ES2, MPU_FSEL_19P2_ES2, MPU_M2_19P2_ES2
/* 3410 */
.word MPU_M_19P2, MPU_N_19P2, MPU_FSEL_19P2, MPU_M2_19P2

/* 26MHz */
/* ES1 */
.word MPU_M_26_ES1, MPU_N_26_ES1, MPU_FSEL_26_ES1, MPU_M2_26_ES1
/* ES2 */
.word MPU_M_26_ES2, MPU_N_26_ES2, MPU_FSEL_26_ES2, MPU_M2_26_ES2
/* 3410 */
.word MPU_M_26, MPU_N_26, MPU_FSEL_26, MPU_M2_26

/* 38.4MHz */
/* ES1 */
.word MPU_M_38P4_ES1, MPU_N_38P4_ES1, MPU_FSEL_38P4_ES1, MPU_M2_38P4_ES1
/* ES2 */
.word MPU_M_38P4_ES2, MPU_N_38P4_ES2, MPU_FSEL_38P4_ES2, MPU_M2_38P4_ES2
/* 3410 */
.word MPU_M_38P4, MPU_N_38P4, MPU_FSEL_38P4, MPU_M2_38P4


.globl get_mpu_dpll_param
get_mpu_dpll_param:
	adr	r0, mpu_dpll_param
	mov	pc, lr

iva_dpll_param:
/* 12MHz */
/* ES1 */
.word IVA_M_12_ES1, IVA_N_12_ES1, IVA_FSEL_12_ES1, IVA_M2_12_ES1
/* ES2 */
.word IVA_M_12_ES2, IVA_N_12_ES2, IVA_FSEL_12_ES2, IVA_M2_12_ES2
/* 3410 */
.word IVA_M_12, IVA_N_12, IVA_FSEL_12, IVA_M2_12

/* 13MHz */
/* ES1 */
.word IVA_M_13_ES1, IVA_N_13_ES1, IVA_FSEL_13_ES1, IVA_M2_13_ES1
/* ES2 */
.word IVA_M_13_ES2, IVA_N_13_ES2,  IVA_FSEL_13_ES2, IVA_M2_13_ES2
/* 3410 */
.word IVA_M_13, IVA_N_13, IVA_FSEL_13, IVA_M2_13

/* 19.2MHz */
/* ES1 */
.word IVA_M_19P2_ES1, IVA_N_19P2_ES1, IVA_FSEL_19P2_ES1, IVA_M2_19P2_ES1
/* ES2 */
.word IVA_M_19P2_ES2, IVA_N_19P2_ES2, IVA_FSEL_19P2_ES2, IVA_M2_19P2_ES2
/* 3410 */
.word IVA_M_19P2, IVA_N_19P2, IVA_FSEL_19P2, IVA_M2_19P2

/* 26MHz */
/* ES1 */
.word IVA_M_26_ES1, IVA_N_26_ES1, IVA_FSEL_26_ES1, IVA_M2_26_ES1
/* ES2 */
.word IVA_M_26_ES2, IVA_N_26_ES2, IVA_FSEL_26_ES2, IVA_M2_26_ES2
/* 3410 */
.word IVA_M_26, IVA_N_26, IVA_FSEL_26, IVA_M2_26

/* 38.4MHz */
/* ES1 */
.word IVA_M_38P4_ES1, IVA_N_38P4_ES1, IVA_FSEL_38P4_ES1, IVA_M2_38P4_ES1
/* ES2 */
.word IVA_M_38P4_ES2, IVA_N_38P4_ES2, IVA_FSEL_38P4_ES2, IVA_M2_38P4_ES2
/* 3410 */
.word IVA_M_38P4, IVA_N_38P4, IVA_FSEL_38P4, IVA_M2_38P4


.globl get_iva_dpll_param
get_iva_dpll_param:
	adr	r0, iva_dpll_param
	mov	pc, lr

/* Core DPLL targets for L3 at 166 & L133 */
core_dpll_param:
/* 12MHz */
/* ES1 */
.word CORE_M_12_ES1, CORE_N_12_ES1, CORE_FSL_12_ES1, CORE_M2_12_ES1
/* ES2 */
.word CORE_M_12, CORE_N_12, CORE_FSEL_12, CORE_M2_12
/* 3410 */
.word CORE_M_12, CORE_N_12, CORE_FSEL_12, CORE_M2_12

/* 13MHz */
/* ES1 */
.word CORE_M_13_ES1, CORE_N_13_ES1, CORE_FSL_13_ES1, CORE_M2_13_ES1
/* ES2 */
.word CORE_M_13, CORE_N_13, CORE_FSEL_13, CORE_M2_13
/* 3410 */
.word CORE_M_13, CORE_N_13, CORE_FSEL_13, CORE_M2_13

/* 19.2MHz */
/* ES1 */
.word CORE_M_19P2_ES1, CORE_N_19P2_ES1, CORE_FSL_19P2_ES1, CORE_M2_19P2_ES1
/* ES2 */
.word CORE_M_19P2, CORE_N_19P2, CORE_FSEL_19P2, CORE_M2_19P2
/* 3410 */
.word CORE_M_19P2, CORE_N_19P2, CORE_FSEL_19P2, CORE_M2_19P2

/* 26MHz */
/* ES1 */
.word CORE_M_26_ES1, CORE_N_26_ES1, CORE_FSL_26_ES1, CORE_M2_26_ES1
/* ES2 */
.word CORE_M_26, CORE_N_26, CORE_FSEL_26, CORE_M2_26
/* 3410 */
.word CORE_M_26, CORE_N_26, CORE_FSEL_26, CORE_M2_26

/* 38.4MHz */
/* ES1 */
.word CORE_M_38P4_ES1, CORE_N_38P4_ES1, CORE_FSL_38P4_ES1, CORE_M2_38P4_ES1
/* ES2 */
.word CORE_M_38P4, CORE_N_38P4, CORE_FSEL_38P4, CORE_M2_38P4
/* 3410 */
.word CORE_M_38P4, CORE_N_38P4, CORE_FSEL_38P4, CORE_M2_38P4

.globl get_core_dpll_param
get_core_dpll_param:
	adr	r0, core_dpll_param
	mov	pc, lr

/* PER DPLL values are same for both ES1 and ES2 */
per_dpll_param:
/* 12MHz */
.word PER_M_12, PER_N_12, PER_FSEL_12, PER_M2_12

/* 13MHz */
.word PER_M_13, PER_N_13, PER_FSEL_13, PER_M2_13

/* 19.2MHz */
.word PER_M_19P2, PER_N_19P2, PER_FSEL_19P2, PER_M2_19P2

/* 26MHz */
.word PER_M_26, PER_N_26, PER_FSEL_26, PER_M2_26

/* 38.4MHz */
.word PER_M_38P4, PER_N_38P4, PER_FSEL_38P4, PER_M2_38P4

.globl get_per_dpll_param
get_per_dpll_param:
	adr	r0, per_dpll_param
	mov	pc, lr