/*
 * sys-dram.c
 *
 * Copyright(c) 2007-2018 Jianjun Jiang <8192542@qq.com>
 * Official site: http://xboot.org
 * Mobile phone: +86-18665388956
 * QQ: 8192542
 *
 * 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 <stdint.h>
#include <f1c100s/reg-ccu.h>
#include <f1c100s/reg-dram.h>
#include <io.h>

#define PLL_DDR_CLK			(156000000)
#define SDR_T_CAS			(0x2)
#define SDR_T_RAS			(0x8)
#define SDR_T_RCD			(0x3)
#define SDR_T_RP			(0x3)
#define SDR_T_WR			(0x3)
#define SDR_T_RFC			(0xd)
#define SDR_T_XSR			(0xf9)
#define SDR_T_RC			(0xb)
#define SDR_T_INIT			(0x8)
#define SDR_T_INIT_REF		(0x7)
#define SDR_T_WTR			(0x2)
#define SDR_T_RRD			(0x2)
#define SDR_T_XP			(0x0)

enum dram_type_t
{
	DRAM_TYPE_SDR	= 0,
	DRAM_TYPE_DDR	= 1,
	DRAM_TYPE_MDDR	= 2,
};

struct dram_para_t
{
	uint32_t base;				/* dram base address */
	uint32_t size;				/* dram size (unit: MByte) */
	uint32_t clk;				/* dram work clock (unit: MHz) */
	uint32_t access_mode;		/* 0: interleave mode 1: sequence mode */
	uint32_t cs_num;			/* dram chip count  1: one chip  2: two chip */
	uint32_t ddr8_remap;		/* for 8bits data width DDR 0: normal  1: 8bits */
	enum dram_type_t sdr_ddr;
	uint32_t bwidth;			/* dram bus width */
	uint32_t col_width;		/* column address width */
	uint32_t row_width;		/* row address width */
	uint32_t bank_size;		/* dram bank count */
	uint32_t cas;				/* dram cas */
};

static inline void sdelay(int loops)
{
	__asm__ __volatile__ ("1:\n" "subs %0, %1, #1\n"
		"bne 1b":"=r" (loops):"0"(loops));
}

static void dram_delay(int ms)
{
	sdelay(ms * 2 * 1000);
}

static int dram_initial(void)
{
	unsigned int time = 0xffffff;

	write32(F1C100S_DRAM_BASE + DRAM_SCTLR, read32(F1C100S_DRAM_BASE + DRAM_SCTLR) | 0x1);
	while((read32(F1C100S_DRAM_BASE + DRAM_SCTLR) & 0x1) && time--)
	{
		if(time == 0)
			return 0;
	}
	return 1;
}

static int dram_delay_scan(void)
{
	unsigned int time = 0xffffff;

	write32(F1C100S_DRAM_BASE + DRAM_DDLYR, read32(F1C100S_DRAM_BASE + DRAM_DDLYR) | 0x1);
	while((read32(F1C100S_DRAM_BASE + DRAM_DDLYR) & 0x1) && time--)
	{
		if(time == 0)
			return 0;
	}
	return 1;
}

static void dram_set_autofresh_cycle(uint32_t clk)
{
	uint32_t val = 0;
	uint32_t row = 0;
	uint32_t temp = 0;

	row = read32(F1C100S_DRAM_BASE + DRAM_SCONR);
	row &= 0x1e0;
	row >>= 0x5;

	if(row == 0xc)
	{
		if(clk >= 1000000)
		{
			temp = clk + (clk >> 3) + (clk >> 4) + (clk >> 5);
			while(temp >= (10000000 >> 6))
			{
				temp -= (10000000 >> 6);
				val++;
			}
		}
		else
		{
			val = (clk * 499) >> 6;
		}
	}
	else if(row == 0xb)
	{
		if(clk >= 1000000)
		{
			temp = clk + (clk >> 3) + (clk >> 4) + (clk >> 5);
			while(temp >= (10000000 >> 7))
			{
				temp -= (10000000 >> 7);
				val++;
			}
		}
		else
		{
			val = (clk * 499) >> 5;
		}
	}
	write32(F1C100S_DRAM_BASE + DRAM_SREFR, val);
}

static int dram_para_setup(struct dram_para_t * para)
{
	uint32_t val = 0;

    val = (para->ddr8_remap) |
    	(0x1 << 1) |
		((para->bank_size >> 2) << 3) |
		((para->cs_num >> 1) << 4) |
		((para->row_width - 1) << 5) |
		((para->col_width - 1) << 9) |
		((para->sdr_ddr ? (para->bwidth >> 4) : (para->bwidth >> 5)) << 13) |
		(para->access_mode << 15) |
		(para->sdr_ddr << 16);

	write32(F1C100S_DRAM_BASE + DRAM_SCONR, val);
	write32(F1C100S_DRAM_BASE + DRAM_SCTLR, read32(F1C100S_DRAM_BASE + DRAM_SCTLR) | (0x1 << 19));
	return dram_initial();
}

static uint32_t dram_check_delay(uint32_t bwidth)
{
	uint32_t dsize;
	uint32_t i,j;
	uint32_t num = 0;
	uint32_t dflag = 0;

	dsize = ((bwidth == 16) ? 4 : 2);
	for(i = 0; i < dsize; i++)
	{
		if(i == 0)
			dflag = read32(F1C100S_DRAM_BASE + DRAM_DRPTR0);
		else if(i == 1)
			dflag = read32(F1C100S_DRAM_BASE + DRAM_DRPTR1);
		else if(i == 2)
			dflag = read32(F1C100S_DRAM_BASE + DRAM_DRPTR2);
		else if(i == 3)
			dflag = read32(F1C100S_DRAM_BASE + DRAM_DRPTR3);

		for(j = 0; j < 32; j++)
		{
			if(dflag & 0x1)
				num++;
			dflag >>= 1;
		}
	}
	return num;
}

static int sdr_readpipe_scan(void)
{
	uint32_t k = 0;

	for(k = 0; k < 32; k++)
	{
		write32(0x80000000 + 4 * k, k);
	}
	for(k = 0; k < 32; k++)
	{
		if(read32(0x80000000 + 4 * k) != k)
			return 0;
	}
	return 1;
}

static uint32_t sdr_readpipe_select(void)
{
	uint32_t value = 0;
	uint32_t i = 0;
	for(i = 0; i < 8; i++)
	{
		write32(F1C100S_DRAM_BASE + DRAM_SCTLR, (read32(F1C100S_DRAM_BASE + DRAM_SCTLR) & (~(0x7 << 6))) | (i << 6));
		if(sdr_readpipe_scan())
		{
			value = i;
			return value;
		}
	}
	return value;
}

static uint32_t dram_check_type(struct dram_para_t * para)
{
	uint32_t val = 0;
	uint32_t times = 0;
	uint32_t i;

	for(i = 0; i < 8; i++)
	{
		val = read32(F1C100S_DRAM_BASE + DRAM_SCTLR);
		val &= ~(0x7 << 6);
		val |= (i << 6);
		write32(F1C100S_DRAM_BASE + DRAM_SCTLR, val);

		dram_delay_scan();
		if(read32(F1C100S_DRAM_BASE + DRAM_DDLYR) & 0x30)
			times++;
	}

	if(times == 8)
	{
		para->sdr_ddr = DRAM_TYPE_SDR;
		return 0;
	}
	else
	{
		para->sdr_ddr = DRAM_TYPE_DDR;
		return 1;
	}
}

static uint32_t dram_scan_readpipe(struct dram_para_t * para)
{
	uint32_t i, rp_best = 0, rp_val = 0;
	uint32_t val = 0;
	uint32_t readpipe[8];

	if(para->sdr_ddr == DRAM_TYPE_DDR)
	{
		for(i = 0; i < 8; i++)
		{
			val = read32(F1C100S_DRAM_BASE + DRAM_SCTLR);
			val &= ~(0x7 << 6);
			val |= (i << 6);
			write32(F1C100S_DRAM_BASE + DRAM_SCTLR, val);
			dram_delay_scan();
			readpipe[i] = 0;
			if((((read32(F1C100S_DRAM_BASE + DRAM_DDLYR) >> 4) & 0x3) == 0x0) &&
				(((read32(F1C100S_DRAM_BASE + DRAM_DDLYR) >> 4) & 0x1) == 0x0))
			{
				readpipe[i] = dram_check_delay(para->bwidth);
			}
			if(rp_val < readpipe[i])
			{
				rp_val = readpipe[i];
				rp_best = i;
			}
		}
		val = read32(F1C100S_DRAM_BASE + DRAM_SCTLR);
		val &= ~(0x7 << 6);
		val |= (rp_best << 6);
		write32(F1C100S_DRAM_BASE + DRAM_SCTLR, val);
		dram_delay_scan();
	}
	else
	{
		val = read32(F1C100S_DRAM_BASE + DRAM_SCONR);
		val &= (~(0x1 << 16));
		val &= (~(0x3 << 13));
		write32(F1C100S_DRAM_BASE + DRAM_SCONR, val);
		rp_best = sdr_readpipe_select();
		val = read32(F1C100S_DRAM_BASE + DRAM_SCTLR);
		val &= ~(0x7 << 6);
		val |= (rp_best << 6);
		write32(F1C100S_DRAM_BASE + DRAM_SCTLR, val);
	}
	return 0;
}

static uint32_t dram_get_dram_size(struct dram_para_t * para)
{
	uint32_t colflag = 10, rowflag = 13;
	uint32_t i = 0;
	uint32_t val1 = 0;
	uint32_t count = 0;
	uint32_t addr1, addr2;

	para->col_width = colflag;
	para->row_width = rowflag;
	dram_para_setup(para);
	dram_scan_readpipe(para);
	for(i = 0; i < 32; i++)
	{
		*((uint32_t *)(0x80000200 + i)) = 0x11111111;
		*((uint32_t *)(0x80000600 + i)) = 0x22222222;
	}
	for(i = 0; i < 32; i++)
	{
		val1 = *((uint32_t *)(0x80000200 + i));
		if(val1 == 0x22222222)
			count++;
	}
	if(count == 32)
	{
		colflag = 9;
	}
	else
	{
		colflag = 10;
	}
	count = 0;
	para->col_width = colflag;
	para->row_width = rowflag;
	dram_para_setup(para);
	if(colflag == 10)
	{
		addr1 = 0x80400000;
		addr2 = 0x80c00000;
	}
	else
	{
		addr1 = 0x80200000;
		addr2 = 0x80600000;
	}
	for(i = 0; i < 32; i++)
	{
		*((uint32_t *)(addr1 + i)) = 0x33333333;
		*((uint32_t *)(addr2 + i)) = 0x44444444;
	}
	for(i = 0; i < 32; i++)
	{
		val1 = *((uint32_t *)(addr1 + i));
		if(val1 == 0x44444444)
		{
			count++;
		}
	}
	if(count == 32)
	{
		rowflag = 12;
	}
	else
	{
		rowflag = 13;
	}
	para->col_width = colflag;
	para->row_width = rowflag;
	if(para->row_width != 13)
	{
		para->size = 16;
	}
	else if(para->col_width == 10)
	{
		para->size = 64;
	}
	else
	{
		para->size = 32;
	}
	dram_set_autofresh_cycle(para->clk);
	para->access_mode = 0;
	dram_para_setup(para);

	return 0;
}

static int dram_init(struct dram_para_t * para)
{
	uint32_t val = 0;
	uint32_t i;

	write32(0x01c20800 + 0x24, read32(0x01c20800 + 0x24) | (0x7 << 12));
	dram_delay(5);
	if(((para->cas) >> 3) & 0x1)
	{
		write32(0x01c20800 + 0x2c4, read32(0x01c20800 + 0x2c4) | (0x1 << 23) | (0x20 << 17));
	}
	if((para->clk >= 144) && (para->clk <= 180))
	{
		write32(0x01c20800 + 0x2c0, 0xaaa);
	}
	if(para->clk >= 180)
	{
		write32(0x01c20800 + 0x2c0, 0xfff);
	}
	if((para->clk) <= 96)
	{
		val = (0x1 << 0) | (0x0 << 4) | (((para->clk * 2) / 12 - 1) << 8) | (0x1u << 31);
	}
	else
	{
		val = (0x0 << 0) | (0x0 << 4) | (((para->clk * 2) / 24 - 1) << 8) | (0x1u << 31);
	}

	if(para->cas & (0x1 << 4))
	{
		write32(F1C100S_CCU_BASE + CCU_PLL_DDR0_PAT, 0xd1303333);
	}
	else if(para->cas & (0x1 << 5))
	{
		write32(F1C100S_CCU_BASE + CCU_PLL_DDR0_PAT, 0xcce06666);
	}
	else if(para->cas & (0x1 << 6))
	{
		write32(F1C100S_CCU_BASE + CCU_PLL_DDR0_PAT, 0xc8909999);
	}
	else if(para->cas & (0x1 << 7))
	{
		write32(F1C100S_CCU_BASE + CCU_PLL_DDR0_PAT, 0xc440cccc);
	}
	if(para->cas & (0xf << 4))
	{
		val |= 0x1 << 24;
	}
	write32(F1C100S_CCU_BASE + CCU_PLL_DDR_CTRL, val);
	write32(F1C100S_CCU_BASE + CCU_PLL_DDR_CTRL, read32(F1C100S_CCU_BASE + CCU_PLL_DDR_CTRL) | (0x1 << 20));
	while((read32(F1C100S_CCU_BASE + CCU_PLL_DDR_CTRL) & (1 << 28)) == 0);
	dram_delay(5);
	write32(F1C100S_CCU_BASE + CCU_BUS_CLK_GATE0, read32(F1C100S_CCU_BASE + CCU_BUS_CLK_GATE0) | (0x1 << 14));
	write32(F1C100S_CCU_BASE + CCU_BUS_SOFT_RST0, read32(F1C100S_CCU_BASE + CCU_BUS_SOFT_RST0) & ~(0x1 << 14));
	for(i = 0; i < 10; i++)
		continue;
	write32(F1C100S_CCU_BASE + CCU_BUS_SOFT_RST0, read32(F1C100S_CCU_BASE + CCU_BUS_SOFT_RST0) | (0x1 << 14));

	val = read32(0x01c20800 + 0x2c4);
	(para->sdr_ddr == DRAM_TYPE_DDR) ? (val |= (0x1 << 16)) : (val &= ~(0x1 << 16));
	write32(0x01c20800 + 0x2c4, val);

	val = (SDR_T_CAS << 0) | (SDR_T_RAS << 3) | (SDR_T_RCD << 7) | (SDR_T_RP << 10) | (SDR_T_WR << 13) | (SDR_T_RFC << 15) | (SDR_T_XSR << 19) | (SDR_T_RC << 28);
	write32(F1C100S_DRAM_BASE + DRAM_STMG0R, val);
	val = (SDR_T_INIT << 0) | (SDR_T_INIT_REF << 16) | (SDR_T_WTR << 20) | (SDR_T_RRD << 22) | (SDR_T_XP << 25);
	write32(F1C100S_DRAM_BASE + DRAM_STMG1R, val);
	dram_para_setup(para);
	dram_check_type(para);

	val = read32(0x01c20800 + 0x2c4);
	(para->sdr_ddr == DRAM_TYPE_DDR) ? (val |= (0x1 << 16)) : (val &= ~(0x1 << 16));
	write32(0x01c20800 + 0x2c4, val);

	dram_set_autofresh_cycle(para->clk);
	dram_scan_readpipe(para);
	dram_get_dram_size(para);

	for(i = 0; i < 128; i++)
	{
		*((volatile uint32_t *)(para->base + 4 * i)) = para->base + 4 * i;
	}

	for(i = 0; i < 128; i++)
	{
		if(*((volatile uint32_t *)(para->base + 4 * i)) != (para->base + 4 * i))
			return 0;
	}
	return 1;
}

void sys_dram_init(void)
{
	struct dram_para_t para;
	uint32_t * dsz = (void *)0x0000005c;

	para.base = 0x80000000;
	para.size = 32;
	para.clk = PLL_DDR_CLK / 1000000;
	para.access_mode = 1;
	para.cs_num = 1;
	para.ddr8_remap = 0;
	para.sdr_ddr = DRAM_TYPE_DDR;
	para.bwidth = 16;
	para.col_width = 10;
	para.row_width = 13;
	para.bank_size = 4;
	para.cas = 0x3;

	if((dsz[0] >> 24) == 'X')
		return;
	if(dram_init(&para))
		dsz[0] = (((uint32_t)'X') << 24) | (para.size << 0);
}