u-boot/arch/arm/cpu/armv7/mx6/soc.c

/*
 * (C) Copyright 2007
 * Sascha Hauer, Pengutronix
 *
 * (C) Copyright 2009 Freescale Semiconductor, Inc.
 *
 * 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 <asm/errno.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/clock.h>
#include <asm/arch/sys_proto.h>

u32 get_cpu_rev(void)
{
	struct anatop_regs *anatop = (struct anatop_regs *)ANATOP_BASE_ADDR;
	int reg = readl(&anatop->digprog);

	/* Read mx6 variant: quad, dual or solo */
	int system_rev = (reg >> 4) & 0xFF000;
	/* Read mx6 silicon revision */
	system_rev |= (reg & 0xFF) + 0x10;

	return system_rev;
}

void init_aips(void)
{
	struct aipstz_regs *aips1, *aips2;

	aips1 = (struct aipstz_regs *)AIPS1_BASE_ADDR;
	aips2 = (struct aipstz_regs *)AIPS2_BASE_ADDR;

	/*
	 * Set all MPROTx to be non-bufferable, trusted for R/W,
	 * not forced to user-mode.
	 */
	writel(0x77777777, &aips1->mprot0);
	writel(0x77777777, &aips1->mprot1);
	writel(0x77777777, &aips2->mprot0);
	writel(0x77777777, &aips2->mprot1);

	/*
	 * Set all OPACRx to be non-bufferable, not require
	 * supervisor privilege level for access,allow for
	 * write access and untrusted master access.
	 */
	writel(0x00000000, &aips1->opacr0);
	writel(0x00000000, &aips1->opacr1);
	writel(0x00000000, &aips1->opacr2);
	writel(0x00000000, &aips1->opacr3);
	writel(0x00000000, &aips1->opacr4);
	writel(0x00000000, &aips2->opacr0);
	writel(0x00000000, &aips2->opacr1);
	writel(0x00000000, &aips2->opacr2);
	writel(0x00000000, &aips2->opacr3);
	writel(0x00000000, &aips2->opacr4);
}

/*
 * Set the VDDSOC
 *
 * Mask out the REG_CORE[22:18] bits (REG2_TRIG) and set
 * them to the specified millivolt level.
 * Possible values are from 0.725V to 1.450V in steps of
 * 0.025V (25mV).
 */
void set_vddsoc(u32 mv)
{
	struct anatop_regs *anatop = (struct anatop_regs *)ANATOP_BASE_ADDR;
	u32 val, reg = readl(&anatop->reg_core);

	if (mv < 725)
		val = 0x00;	/* Power gated off */
	else if (mv > 1450)
		val = 0x1F;	/* Power FET switched full on. No regulation */
	else
		val = (mv - 700) / 25;

	/*
	 * Mask out the REG_CORE[22:18] bits (REG2_TRIG)
	 * and set them to the calculated value (0.7V + val * 0.25V)
	 */
	reg = (reg & ~(0x1F << 18)) | (val << 18);
	writel(reg, &anatop->reg_core);
}

int arch_cpu_init(void)
{
	init_aips();

	set_vddsoc(1200);	/* Set VDDSOC to 1.2V */

	return 0;
}

#ifndef CONFIG_SYS_DCACHE_OFF
void enable_caches(void)
{
	/* Enable D-cache. I-cache is already enabled in start.S */
	dcache_enable();
}
#endif

#if defined(CONFIG_FEC_MXC)
void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
{
	struct iim_regs *iim = (struct iim_regs *)IMX_IIM_BASE;
	struct fuse_bank *bank = &iim->bank[4];
	struct fuse_bank4_regs *fuse =
			(struct fuse_bank4_regs *)bank->fuse_regs;

	u32 value = readl(&fuse->mac_addr_high);
	mac[0] = (value >> 8);
	mac[1] = value ;

	value = readl(&fuse->mac_addr_low);
	mac[2] = value >> 24 ;
	mac[3] = value >> 16 ;
	mac[4] = value >> 8 ;
	mac[5] = value ;

}
#endif