oleavr-rgl-a500-mini-linux-3.10/drivers/soc/allwinner/pm_legacy/standby/dram/standby.c

/*
 * Copyright (c) 2007-2017 Allwinnertech Co., Ltd.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 *
 */

/********************************************************************************
 * Allwinner Technology, All Right Reserved. 2006-2010 Copyright (c)
 *
 * File: standby.c
 *
 * Description:  This file implements standby for AW1681 DRAM controller
 *
 * History:
 *
 * date		author		version		note
 *
 * 20140926	liuke		v0.1		initial
 *
 *
 *
 *
 ********************************************************************************/
#define STANDBY_TEST

#ifdef STANDBY_TEST
#include "dram.h"

/* default config */
__u32 dram_crc_en;
__u32 dram_crc_start = 0x40000000;
__u32 dram_crc_len = (1024 * 1024);

__s32 standby_set_dram_crc_paras(__u32 en, __u32 start, __u32 len)
{
	dram_crc_en = en;
	dram_crc_start = start;
	dram_crc_len = len;

	return 0;
}

__u32 standby_dram_crc(void)
{
	__u32 *pdata = (__u32 *) (dram_crc_start);
	__u32 crc = 0;

	printk("crc begin...\n");
	if (0 != dram_crc_en) {
		printk("start:%x len:%x\n", dram_crc_start, dram_crc_len);
		while (pdata < (__u32 *) (dram_crc_start + dram_crc_len)) {
			crc += *pdata;
			pdata++;
		}
	}
	printk("crc finish...\n");
	return crc;
}

unsigned int dram_power_save_process()
{
	unsigned int reg_val = 0;
	unsigned int i, n = 2;

	/* disable all master access  */
	mctl_write_w(0, MC_MAER);	/* close all master */

	/* DRAM power down. */
	/* 1.enter self refresh */
	reg_val = mctl_read_w(PWRCTL);
	reg_val |= 0x1 << 0;
	reg_val |= (0x1 << 8);
	mctl_write_w(reg_val, PWRCTL);
	/* confirm dram controller has enter selfrefresh */
	while (((mctl_read_w(STATR) & 0x7) != 0x3))
		;

	/* 2.disable CK and power down pad include AC/DX/ pad,
	 * ZQ calibration module power down
	 */

	for (i = 0; i < n; i++) {
		reg_val = mctl_read_w(DXnGCR0(i));
		reg_val &= ~(0x3U << 22);
		reg_val |= (0x1U << 22);	/* DQS receiver off */
		reg_val &= ~(0xfU << 12);
		reg_val |= (0x5U << 12);	/* POWER DOWN RECEIVER/DRICER OFF */
		reg_val |= (0x2U << 2);	/* OE mode disable */
		reg_val &= ~(0x1U << 0);	/* DQ GROUP OFF */
		mctl_write_w(reg_val, DXnGCR0(i));
	}
	reg_val = mctl_read_w(CAIOCR0);	/* CA IO POWER DOWN */
	reg_val |= (0x3U << 8);	/* CKE ENABLE */
	reg_val &= ~(0x3U << 6);	/* CK OUTPUT DISABLE */
/*       reg_val &= ~(0x1U<<3);          //CA OE OFF     //do not close for 1681/1680 */
	reg_val |= (0x3U << 0);	/* CA POWER DOWN RECEIVER/DRIVER ON */
	mctl_write_w(reg_val, CAIOCR0);

	/* 4.disable global clk and pll-ddr0/pll-ddr1 */
	mctl_write_w(0x0, MC_CLKEN);
	/* disable PLL_DDR1 */
	reg_val = mctl_read_w(_CCM_PLL_DDR1_REG);
	reg_val &= ~(0x1U << 31);
	mctl_write_w(reg_val, _CCM_PLL_DDR1_REG);

	/* close DRAM AHB gate */
	reg_val = mctl_read_w(BUS_CLK_GATE_REG0);
	reg_val &= ~(0x1U << 14);
	mctl_write_w(reg_val, BUS_CLK_GATE_REG0);

	/* close MBUS CLK gate */
	reg_val = mctl_read_w(MBUS_CLK_CTL_REG);
	reg_val &= ~(1U << 31);
	mctl_write_w(reg_val, MBUS_CLK_CTL_REG);

	return DRAM_RET_OK;
}

unsigned int dram_power_up_process(__dram_para_t *para)
{
	unsigned int reg_val = 0;
	unsigned int i, n = 2;

	/* Open MBUS CLK gate */
	reg_val = mctl_read_w(MBUS_CLK_CTL_REG);
	reg_val |= (1U << 31);
	mctl_write_w(reg_val, MBUS_CLK_CTL_REG);

	/* Open DRAM AHB gate */
	reg_val = mctl_read_w(BUS_CLK_GATE_REG0);
	reg_val |= (0x1U << 14);
	mctl_write_w(reg_val, BUS_CLK_GATE_REG0);

	/* enable PLL_DDR1,and wait it stable */
	reg_val = mctl_read_w(_CCM_PLL_DDR1_REG);
	reg_val |= (0x1U << 31);
	mctl_write_w(reg_val, _CCM_PLL_DDR1_REG);
	while (mctl_read_w(_CCM_PLL_DDR1_REG) == 1)
		;

	/* enable global clk */
	mctl_write_w(0xC00e, MC_CLKEN);

	/* controller enter self refresh */
	reg_val = mctl_read_w(PWRCTL);
	reg_val |= 0x1 << 0;
	reg_val |= (0x1 << 8);
	mctl_write_w(reg_val, PWRCTL);
	/* confirm dram controller has enter selfrefresh */
	while (((mctl_read_w(STATR) & 0x7) != 0x3))
		;

	/* CA Power down dynamic */
	reg_val = mctl_read_w(CAIOCR0);
	reg_val |= (0x3U << 8);	/* CKE ENABLE */
	reg_val |= (0x1U << 6);	/* CK OUTPUT enable */
/*       reg_val |= (0x1U<<3);           //CA OE on //according to standby enter status */
	reg_val &= ~(0x3U << 0);	/* CA POWER DOWN RECEIVER/DRIVER off */
	mctl_write_w(reg_val, CAIOCR0);

	for (i = 0; i < n; i++) {
		reg_val = mctl_read_w(DXnGCR0(i));
		reg_val &= ~(0x3U << 22);	/* DQS receiver dynamic */
		reg_val &= ~(0xfU << 12);	/* POWER DOWN RECEIVER/DRICER OFF dynamic */
		reg_val &= ~(0x3U << 2);	/* OE mode dynamic */
		reg_val |= (0x1U << 0);	/* DQ GROUP ON */
		mctl_write_w(reg_val, DXnGCR0(i));
	}

	reg_val = mctl_read_w(PWRCTL);
	reg_val &= ~(0x1 << 0);
	reg_val &= ~(0x1 << 8);
	mctl_write_w(reg_val, PWRCTL);
	/* confirm dram controller has exit from selfrefresh */
	while (((mctl_read_w(STATR) & 0x7) != 0x1))
		;

	/* enable all master access  */
	mctl_write_w(0xffffffff, MC_MAER);

	return DRAM_RET_OK;
}
#endif