/*
 * Copyright (c) 2013 Qualcomm Atheros, 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 <jffs2/jffs2.h>
#include <asm/addrspace.h>
#include <asm/types.h>
#include "ar7240_soc.h"
#include "ar7240_flash.h"

/*
 * globals
 */
flash_info_t flash_info[CFG_MAX_FLASH_BANKS];

#undef display
#define display(x)  ;

/*
 * statics
 */
static void ar7240_spi_write_enable(void);
static void ar7240_spi_poll(void);
#if !defined(ATH_SST_FLASH)
static void ar7240_spi_write_page(uint32_t addr, uint8_t * data, int len);
#endif
static void ar7240_spi_sector_erase(uint32_t addr);

static void
ath_spi_read_id(void)
{
	u32 rd = 0x777777;

	ar7240_reg_wr_nf(AR7240_SPI_WRITE, AR7240_SPI_CS_DIS);
	ar7240_spi_bit_banger(AR7240_SPI_CMD_RDID);
	ar7240_spi_delay_8();
	ar7240_spi_delay_8();
	ar7240_spi_delay_8();
	ar7240_spi_go();

	rd = ar7240_reg_rd(AR7240_SPI_RD_STATUS);

	printf("Flash Manuf Id 0x%x, DeviceId0 0x%x, DeviceId1 0x%x\n",
		(rd >> 16) & 0xff, (rd >> 8) & 0xff, (rd >> 0) & 0xff);
}


#ifdef ATH_SST_FLASH
void ar7240_spi_flash_unblock(void)
{
	ar7240_spi_write_enable();
	ar7240_spi_bit_banger(AR7240_SPI_CMD_WRITE_SR);
	ar7240_spi_bit_banger(0x0);
	ar7240_spi_go();
	ar7240_spi_poll();
}
#endif

unsigned long flash_init(void)
{
#ifndef CONFIG_WASP
#ifdef ATH_SST_FLASH
	ar7240_reg_wr_nf(AR7240_SPI_CLOCK, 0x3);
	ar7240_spi_flash_unblock();
	ar7240_reg_wr(AR7240_SPI_FS, 0);
#else
	ar7240_reg_wr_nf(AR7240_SPI_CLOCK, 0x43);
#endif
#endif
	ar7240_reg_rmw_set(AR7240_SPI_FS, 1);
	ath_spi_read_id();
	ar7240_reg_rmw_clear(AR7240_SPI_FS, 1);

	/*
	 * hook into board specific code to fill flash_info
	 */
	return (flash_get_geom(&flash_info[0]));
}

void
flash_print_info(flash_info_t *info)
{
	printf("The hell do you want flinfo for??\n");
}

int
flash_erase(flash_info_t *info, int s_first, int s_last)
{
	int i, sector_size = info->size / info->sector_count;

#ifdef FLASH_DEBUG
	printf("\nFirst %#x last %#x sector size %#x\n",
	       s_first, s_last, sector_size);
#endif

	for (i = s_first; i <= s_last; i++) {
#ifdef FLASH_DEBUG
		printf("\b\b\b\b%4d", i);
#else
		puts(".");
#endif
		ar7240_spi_sector_erase(i * sector_size);
	}
	ar7240_spi_done();
	printf("\n");

	return 0;
}

/*
 * Write a buffer from memory to flash:
 * 0. Assumption: Caller has already erased the appropriate sectors.
 * 1. call page programming for every 256 bytes
 */
#ifdef ATH_SST_FLASH
void
ar7240_spi_flash_chip_erase(void)
{
	ar7240_spi_write_enable();
	ar7240_spi_bit_banger(AR7240_SPI_CMD_CHIP_ERASE);
	ar7240_spi_go();
	ar7240_spi_poll();
}

int
write_buff(flash_info_t *info, uchar *src, ulong dst, ulong len)
{
	uint32_t val;

	dst = dst - CFG_FLASH_BASE;
	printf("write len: %lu dst: 0x%x src: %p\n", len, dst, src);

	for (; len; len--, dst++, src++) {
		ar7240_spi_write_enable();	// dont move this above 'for'
		ar7240_spi_bit_banger(AR7240_SPI_CMD_PAGE_PROG);
		ar7240_spi_send_addr(dst);

		val = *src & 0xff;
		ar7240_spi_bit_banger(val);

		ar7240_spi_go();
		ar7240_spi_poll();
	}
	/*
	 * Disable the Function Select
	 * Without this we can't read from the chip again
	 */
	ar7240_reg_wr(AR7240_SPI_FS, 0);

	if (len) {
		// how to differentiate errors ??
		return ERR_PROG_ERROR;
	} else {
		return ERR_OK;
	}
}
#else
int
write_buff(flash_info_t *info, uchar *source, ulong addr, ulong len)
{
	int total = 0, len_this_lp, bytes_this_page, counter = 0;
	ulong dst;
	uchar *src;

#ifdef FLASH_DEBUG
	printf("write addr: %x\n", addr);
#endif
	addr = addr - CFG_FLASH_BASE;

	while (total < len) {
		src = source + total;
		dst = addr + total;
		bytes_this_page =
		    AR7240_SPI_PAGE_SIZE - (addr & (AR7240_SPI_PAGE_SIZE-1));
		len_this_lp =
		    ((len - total) >
		     bytes_this_page) ? bytes_this_page : (len - total);
		ar7240_spi_write_page(dst, src, len_this_lp);
		total += len_this_lp;
		if(counter>=255)
		{
			puts(".");
			counter = 0;
		}
		else
		{
			counter++;
		}
	}

	ar7240_spi_done();

	return 0;
}
#endif

static void
ar7240_spi_write_enable()
{
	ar7240_reg_wr_nf(AR7240_SPI_FS, 1);
	ar7240_reg_wr_nf(AR7240_SPI_WRITE, AR7240_SPI_CS_DIS);
	ar7240_spi_bit_banger(AR7240_SPI_CMD_WREN);
	ar7240_spi_go();
}

static void
ar7240_spi_poll()
{
	int rd;

	do {
		ar7240_reg_wr_nf(AR7240_SPI_WRITE, AR7240_SPI_CS_DIS);
		ar7240_spi_bit_banger(AR7240_SPI_CMD_RD_STATUS);
		ar7240_spi_delay_8();
		rd = (ar7240_reg_rd(AR7240_SPI_RD_STATUS) & 1);
	} while (rd);
}

#if !defined(ATH_SST_FLASH)
static void
ar7240_spi_write_page(uint32_t addr, uint8_t *data, int len)
{
	int i;
	uint8_t ch;

	display(0x77);
	ar7240_spi_write_enable();
	ar7240_spi_bit_banger(AR7240_SPI_CMD_PAGE_PROG);
	ar7240_spi_send_addr(addr);

	for (i = 0; i < len; i++) {
		ch = *(data + i);
		ar7240_spi_bit_banger(ch);
	}

	ar7240_spi_go();
	display(0x66);
	ar7240_spi_poll();
	display(0x6d);
}
#endif

static void
ar7240_spi_sector_erase(uint32_t addr)
{
	ar7240_spi_write_enable();
	ar7240_spi_bit_banger(AR7240_SPI_CMD_SECTOR_ERASE);
	ar7240_spi_send_addr(addr);
	ar7240_spi_go();
	display(0x7d);
	ar7240_spi_poll();
}