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/*
* (C) Copyright 2006 DENX Software Engineering
*
* 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>
#if defined(CONFIG_CMD_NAND)
#include <nand.h>
#include <asm/arch/pxa-regs.h>
#include <asm/io.h>
#ifdef CONFIG_SYS_DFC_DEBUG1
# define DFC_DEBUG1(fmt, args...) printf(fmt, ##args)
#else
# define DFC_DEBUG1(fmt, args...)
#endif
#ifdef CONFIG_SYS_DFC_DEBUG2
# define DFC_DEBUG2(fmt, args...) printf(fmt, ##args)
#else
# define DFC_DEBUG2(fmt, args...)
#endif
#ifdef CONFIG_SYS_DFC_DEBUG3
# define DFC_DEBUG3(fmt, args...) printf(fmt, ##args)
#else
# define DFC_DEBUG3(fmt, args...)
#endif
/* These really don't belong here, as they are specific to the NAND Model */
static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
static struct nand_bbt_descr delta_bbt_descr = {
.options = 0,
.offs = 0,
.len = 2,
.pattern = scan_ff_pattern
};
static struct nand_ecclayout delta_oob = {
.eccbytes = 6,
.eccpos = {2, 3, 4, 5, 6, 7},
.oobfree = { {8, 2}, {12, 4} }
};
/*
* not required for Monahans DFC
*/
static void dfc_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
return;
}
#if 0
/* read device ready pin */
static int dfc_device_ready(struct mtd_info *mtdinfo)
{
if(NDSR & NDSR_RDY)
return 1;
else
return 0;
return 0;
}
#endif
/*
* Write buf to the DFC Controller Data Buffer
*/
static void dfc_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
{
unsigned long bytes_multi = len & 0xfffffffc;
unsigned long rest = len & 0x3;
unsigned long *long_buf;
int i;
DFC_DEBUG2("dfc_write_buf: writing %d bytes starting with 0x%x.\n", len, *((unsigned long*) buf));
if(bytes_multi) {
for(i=0; i<bytes_multi; i+=4) {
long_buf = (unsigned long*) &buf[i];
writel(*long_buf, NDDB);
}
}
if(rest) {
printf("dfc_write_buf: ERROR, writing non 4-byte aligned data.\n");
}
return;
}
static void dfc_read_buf(struct mtd_info *mtd, u_char* const buf, int len)
{
int i=0, j;
/* we have to be carefull not to overflow the buffer if len is
* not a multiple of 4 */
unsigned long bytes_multi = len & 0xfffffffc;
unsigned long rest = len & 0x3;
unsigned long *long_buf;
DFC_DEBUG3("dfc_read_buf: reading %d bytes.\n", len);
/* if there are any, first copy multiple of 4 bytes */
if(bytes_multi) {
for(i=0; i<bytes_multi; i+=4) {
long_buf = (unsigned long*) &buf[i];
*long_buf = readl(NDDB);
}
}
/* ...then the rest */
if(rest) {
unsigned long rest_data = NDDB;
for(j=0;j<rest; j++)
buf[i+j] = (u_char) ((rest_data>>j) & 0xff);
}
return;
}
/*
* read a word. Not implemented as not used in NAND code.
*/
static u16 dfc_read_word(struct mtd_info *mtd)
{
printf("dfc_read_word: UNIMPLEMENTED.\n");
return 0;
}
/* global var, too bad: mk@tbd: move to ->priv pointer */
static unsigned long read_buf = 0;
static int bytes_read = -1;
/*
* read a byte from NDDB Because we can only read 4 bytes from NDDB at
* a time, we buffer the remaining bytes. The buffer is reset when a
* new command is sent to the chip.
*
* WARNING:
* This function is currently only used to read status and id
* bytes. For these commands always 8 bytes need to be read from
* NDDB. So we read and discard these bytes right now. In case this
* function is used for anything else in the future, we must check
* what was the last command issued and read the appropriate amount of
* bytes respectively.
*/
static u_char dfc_read_byte(struct mtd_info *mtd)
{
unsigned char byte;
unsigned long dummy;
if(bytes_read < 0) {
read_buf = readl(NDDB);
dummy = readl(NDDB);
bytes_read = 0;
}
byte = (unsigned char) (read_buf>>(8 * bytes_read++));
if(bytes_read >= 4)
bytes_read = -1;
DFC_DEBUG2("dfc_read_byte: byte %u: 0x%x of (0x%x).\n", bytes_read - 1, byte, read_buf);
return byte;
}
/* calculate delta between OSCR values start and now */
static unsigned long get_delta(unsigned long start)
{
unsigned long cur = readl(OSCR);
if(cur < start) /* OSCR overflowed */
return (cur + (start^0xffffffff));
else
return (cur - start);
}
/* delay function, this doesn't belong here */
static void wait_us(unsigned long us)
{
unsigned long start = readl(OSCR);
us = DIV_ROUND_UP(us * OSCR_CLK_FREQ, 1000);
while (get_delta(start) < us) {
/* do nothing */
}
}
static void dfc_clear_nddb(void)
{
writel(readl(NDCR) & ~NDCR_ND_RUN, NDCR);
wait_us(CONFIG_SYS_NAND_OTHER_TO);
}
/* wait_event with timeout */
static unsigned long dfc_wait_event(unsigned long event)
{
unsigned long ndsr, timeout, start = readl(OSCR);
if(!event)
return 0xff000000;
else if(event & (NDSR_CS0_CMDD | NDSR_CS0_BBD))
timeout = DIV_ROUND_UP(CONFIG_SYS_NAND_PROG_ERASE_TO
* OSCR_CLK_FREQ, 1000);
else
timeout = DIV_ROUND_UP(CONFIG_SYS_NAND_OTHER_TO
* OSCR_CLK_FREQ, 1000);
while(1) {
ndsr = readl(NDSR);
if(ndsr & event) {
writel(readl(NDSR) | event, NDSR);
break;
}
if(get_delta(start) > timeout) {
DFC_DEBUG1("dfc_wait_event: TIMEOUT waiting for event: 0x%lx.\n", event);
return 0xff000000;
}
}
return ndsr;
}
/* we don't always wan't to do this */
static void dfc_new_cmd(void)
{
int retry = 0;
unsigned long status;
while(retry++ <= CONFIG_SYS_NAND_SENDCMD_RETRY) {
/* Clear NDSR */
writel(0xfff, NDSR);
/* set NDCR[NDRUN] */
if (!(readl(NDCR) & NDCR_ND_RUN))
writel(readl(NDCR) | NDCR_ND_RUN, NDCR);
status = dfc_wait_event(NDSR_WRCMDREQ);
if(status & NDSR_WRCMDREQ)
return;
DFC_DEBUG2("dfc_new_cmd: FAILED to get WRITECMDREQ, retry: %d.\n", retry);
dfc_clear_nddb();
}
DFC_DEBUG1("dfc_new_cmd: giving up after %d retries.\n", retry);
}
/* this function is called after Programm and Erase Operations to
* check for success or failure */
static int dfc_wait(struct mtd_info *mtd, struct nand_chip *this)
{
unsigned long ndsr=0, event=0;
int state = this->state;
if(state == FL_WRITING) {
event = NDSR_CS0_CMDD | NDSR_CS0_BBD;
} else if(state == FL_ERASING) {
event = NDSR_CS0_CMDD | NDSR_CS0_BBD;
}
ndsr = dfc_wait_event(event);
if((ndsr & NDSR_CS0_BBD) || (ndsr & 0xff000000))
return(0x1); /* Status Read error */
return 0;
}
/* cmdfunc send commands to the DFC */
static void dfc_cmdfunc(struct mtd_info *mtd, unsigned command,
int column, int page_addr)
{
/* register struct nand_chip *this = mtd->priv; */
unsigned long ndcb0=0, ndcb1=0, ndcb2=0, event=0;
/* clear the ugly byte read buffer */
bytes_read = -1;
read_buf = 0;
switch (command) {
case NAND_CMD_READ0:
DFC_DEBUG3("dfc_cmdfunc: NAND_CMD_READ0, page_addr: 0x%x, column: 0x%x.\n", page_addr, (column>>1));
dfc_new_cmd();
ndcb0 = (NAND_CMD_READ0 | (4<<16));
column >>= 1; /* adjust for 16 bit bus */
ndcb1 = (((column>>1) & 0xff) |
((page_addr<<8) & 0xff00) |
((page_addr<<8) & 0xff0000) |
((page_addr<<8) & 0xff000000)); /* make this 0x01000000 ? */
event = NDSR_RDDREQ;
goto write_cmd;
case NAND_CMD_READ1:
DFC_DEBUG2("dfc_cmdfunc: NAND_CMD_READ1 unimplemented!\n");
goto end;
case NAND_CMD_READOOB:
DFC_DEBUG1("dfc_cmdfunc: NAND_CMD_READOOB unimplemented!\n");
goto end;
case NAND_CMD_READID:
dfc_new_cmd();
DFC_DEBUG2("dfc_cmdfunc: NAND_CMD_READID.\n");
ndcb0 = (NAND_CMD_READID | (3 << 21) | (1 << 16)); /* addr cycles*/
event = NDSR_RDDREQ;
goto write_cmd;
case NAND_CMD_PAGEPROG:
/* sent as a multicommand in NAND_CMD_SEQIN */
DFC_DEBUG2("dfc_cmdfunc: NAND_CMD_PAGEPROG empty due to multicmd.\n");
goto end;
case NAND_CMD_ERASE1:
DFC_DEBUG2("dfc_cmdfunc: NAND_CMD_ERASE1, page_addr: 0x%x, column: 0x%x.\n", page_addr, (column>>1));
dfc_new_cmd();
ndcb0 = (0xd060 | (1<<25) | (2<<21) | (1<<19) | (3<<16));
ndcb1 = (page_addr & 0x00ffffff);
goto write_cmd;
case NAND_CMD_ERASE2:
DFC_DEBUG2("dfc_cmdfunc: NAND_CMD_ERASE2 empty due to multicmd.\n");
goto end;
case NAND_CMD_SEQIN:
/* send PAGE_PROG command(0x1080) */
dfc_new_cmd();
DFC_DEBUG2("dfc_cmdfunc: NAND_CMD_SEQIN/PAGE_PROG, page_addr: 0x%x, column: 0x%x.\n", page_addr, (column>>1));
ndcb0 = (0x1080 | (1<<25) | (1<<21) | (1<<19) | (4<<16));
column >>= 1; /* adjust for 16 bit bus */
ndcb1 = (((column>>1) & 0xff) |
((page_addr<<8) & 0xff00) |
((page_addr<<8) & 0xff0000) |
((page_addr<<8) & 0xff000000)); /* make this 0x01000000 ? */
event = NDSR_WRDREQ;
goto write_cmd;
case NAND_CMD_STATUS:
DFC_DEBUG2("dfc_cmdfunc: NAND_CMD_STATUS.\n");
dfc_new_cmd();
ndcb0 = NAND_CMD_STATUS | (4<<21);
event = NDSR_RDDREQ;
goto write_cmd;
case NAND_CMD_RESET:
DFC_DEBUG2("dfc_cmdfunc: NAND_CMD_RESET.\n");
ndcb0 = NAND_CMD_RESET | (5<<21);
event = NDSR_CS0_CMDD;
goto write_cmd;
default:
printk("dfc_cmdfunc: error, unsupported command.\n");
goto end;
}
write_cmd:
writel(ndcb0, NDCB0);
writel(ndcb1, NDCB0);
writel(ndcb2, NDCB0);
/* wait_event: */
dfc_wait_event(event);
end:
return;
}
static void dfc_gpio_init(void)
{
DFC_DEBUG2("Setting up DFC GPIO's.\n");
/* no idea what is done here, see zylonite.c */
writel(0x1, GPIO4);
writel(0x00000001, DF_ALE_nWE1);
writel(0x00000001, DF_ALE_nWE2);
writel(0x00000001, DF_nCS0);
writel(0x00000001, DF_nCS1);
writel(0x00000001, DF_nWE);
writel(0x00000001, DF_nRE);
writel(0x00000001, DF_IO0);
writel(0x00000001, DF_IO8);
writel(0x00000001, DF_IO1);
writel(0x00000001, DF_IO9);
writel(0x00000001, DF_IO2);
writel(0x00000001, DF_IO10);
writel(0x00000001, DF_IO3);
writel(0x00000001, DF_IO11);
writel(0x00000001, DF_IO4);
writel(0x00000001, DF_IO12);
writel(0x00000001, DF_IO5);
writel(0x00000001, DF_IO13);
writel(0x00000001, DF_IO6);
writel(0x00000001, DF_IO14);
writel(0x00000001, DF_IO7);
writel(0x00000001, DF_IO15);
writel(0x1901, DF_nWE);
writel(0x1901, DF_nRE);
writel(0x1900, DF_CLE_nOE);
writel(0x1901, DF_ALE_nWE1);
writel(0x1900, DF_INT_RnB);
}
/*
* Board-specific NAND initialization. The following members of the
* argument are board-specific (per include/linux/mtd/nand_new.h):
* - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
* - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
* - hwcontrol: hardwarespecific function for accesing control-lines
* - dev_ready: hardwarespecific function for accesing device ready/busy line
* - enable_hwecc?: function to enable (reset) hardware ecc generator. Must
* only be provided if a hardware ECC is available
* - ecc.mode: mode of ecc, see defines
* - chip_delay: chip dependent delay for transfering data from array to
* read regs (tR)
* - options: various chip options. They can partly be set to inform
* nand_scan about special functionality. See the defines for further
* explanation
* Members with a "?" were not set in the merged testing-NAND branch,
* so they are not set here either.
*/
int board_nand_init(struct nand_chip *nand)
{
unsigned long tCH, tCS, tWH, tWP, tRH, tRP, tRP_high, tR, tWHR, tAR;
/* set up GPIO Control Registers */
dfc_gpio_init();
/* turn on the NAND Controller Clock (104 MHz @ D0) */
writel(readl(CKENA) | (CKENA_4_NAND | CKENA_9_SMC), CKENA);
#undef CONFIG_SYS_TIMING_TIGHT
#ifndef CONFIG_SYS_TIMING_TIGHT
tCH = MIN(((unsigned long) (NAND_TIMING_tCH * DFC_CLK_PER_US) + 1),
DFC_MAX_tCH);
tCS = MIN(((unsigned long) (NAND_TIMING_tCS * DFC_CLK_PER_US) + 1),
DFC_MAX_tCS);
tWH = MIN(((unsigned long) (NAND_TIMING_tWH * DFC_CLK_PER_US) + 1),
DFC_MAX_tWH);
tWP = MIN(((unsigned long) (NAND_TIMING_tWP * DFC_CLK_PER_US) + 1),
DFC_MAX_tWP);
tRH = MIN(((unsigned long) (NAND_TIMING_tRH * DFC_CLK_PER_US) + 1),
DFC_MAX_tRH);
tRP = MIN(((unsigned long) (NAND_TIMING_tRP * DFC_CLK_PER_US) + 1),
DFC_MAX_tRP);
tR = MIN(((unsigned long) (NAND_TIMING_tR * DFC_CLK_PER_US) + 1),
DFC_MAX_tR);
tWHR = MIN(((unsigned long) (NAND_TIMING_tWHR * DFC_CLK_PER_US) + 1),
DFC_MAX_tWHR);
tAR = MIN(((unsigned long) (NAND_TIMING_tAR * DFC_CLK_PER_US) + 1),
DFC_MAX_tAR);
#else /* this is the tight timing */
tCH = MIN(((unsigned long) (NAND_TIMING_tCH * DFC_CLK_PER_US)),
DFC_MAX_tCH);
tCS = MIN(((unsigned long) (NAND_TIMING_tCS * DFC_CLK_PER_US)),
DFC_MAX_tCS);
tWH = MIN(((unsigned long) (NAND_TIMING_tWH * DFC_CLK_PER_US)),
DFC_MAX_tWH);
tWP = MIN(((unsigned long) (NAND_TIMING_tWP * DFC_CLK_PER_US)),
DFC_MAX_tWP);
tRH = MIN(((unsigned long) (NAND_TIMING_tRH * DFC_CLK_PER_US)),
DFC_MAX_tRH);
tRP = MIN(((unsigned long) (NAND_TIMING_tRP * DFC_CLK_PER_US)),
DFC_MAX_tRP);
tR = MIN(((unsigned long) (NAND_TIMING_tR * DFC_CLK_PER_US) - tCH - 2),
DFC_MAX_tR);
tWHR = MIN(((unsigned long) (NAND_TIMING_tWHR * DFC_CLK_PER_US) - tCH - 2),
DFC_MAX_tWHR);
tAR = MIN(((unsigned long) (NAND_TIMING_tAR * DFC_CLK_PER_US) - 2),
DFC_MAX_tAR);
#endif /* CONFIG_SYS_TIMING_TIGHT */
DFC_DEBUG2("tCH=%u, tCS=%u, tWH=%u, tWP=%u, tRH=%u, tRP=%u, tR=%u, tWHR=%u, tAR=%u.\n", tCH, tCS, tWH, tWP, tRH, tRP, tR, tWHR, tAR);
/* tRP value is split in the register */
if(tRP & (1 << 4)) {
tRP_high = 1;
tRP &= ~(1 << 4);
} else {
tRP_high = 0;
}
writel((tCH << 19) |
(tCS << 16) |
(tWH << 11) |
(tWP << 8) |
(tRP_high << 6) |
(tRH << 3) |
(tRP << 0),
NDTR0CS0);
writel((tR << 16) |
(tWHR << 4) |
(tAR << 0),
NDTR1CS0);
/* If it doesn't work (unlikely) think about:
* - ecc enable
* - chip select don't care
* - read id byte count
*
* Intentionally enabled by not setting bits:
* - dma (DMA_EN)
* - page size = 512
* - cs don't care, see if we can enable later!
* - row address start position (after second cycle)
* - pages per block = 32
* - ND_RDY : clears command buffer
*/
/* NDCR_NCSX | /\* Chip select busy don't care *\/ */
writel(NDCR_SPARE_EN | /* use the spare area */
NDCR_DWIDTH_C | /* 16bit DFC data bus width */
NDCR_DWIDTH_M | /* 16 bit Flash device data bus width */
(2 << 16) | /* read id count = 7 ???? mk@tbd */
NDCR_ND_ARB_EN | /* enable bus arbiter */
NDCR_RDYM | /* flash device ready ir masked */
NDCR_CS0_PAGEDM | /* ND_nCSx page done ir masked */
NDCR_CS1_PAGEDM |
NDCR_CS0_CMDDM | /* ND_CSx command done ir masked */
NDCR_CS1_CMDDM |
NDCR_CS0_BBDM | /* ND_CSx bad block detect ir masked */
NDCR_CS1_BBDM |
NDCR_DBERRM | /* double bit error ir masked */
NDCR_SBERRM | /* single bit error ir masked */
NDCR_WRDREQM | /* write data request ir masked */
NDCR_RDDREQM | /* read data request ir masked */
NDCR_WRCMDREQM, /* write command request ir masked */
NDCR);
/* wait 10 us due to cmd buffer clear reset */
/* wait(10); */
nand->cmd_ctrl = dfc_hwcontrol;
/* nand->dev_ready = dfc_device_ready; */
nand->ecc.mode = NAND_ECC_SOFT;
nand->ecc.layout = &delta_oob;
nand->options = NAND_BUSWIDTH_16;
nand->waitfunc = dfc_wait;
nand->read_byte = dfc_read_byte;
nand->read_word = dfc_read_word;
nand->read_buf = dfc_read_buf;
nand->write_buf = dfc_write_buf;
nand->cmdfunc = dfc_cmdfunc;
nand->badblock_pattern = &delta_bbt_descr;
return 0;
}
#endif