diff options
Diffstat (limited to 'board/zylonite/nand.c')
| -rw-r--r-- | board/zylonite/nand.c | 584 |
1 files changed, 584 insertions, 0 deletions
diff --git a/board/zylonite/nand.c b/board/zylonite/nand.c new file mode 100644 index 0000000..5d2cd65 --- /dev/null +++ b/board/zylonite/nand.c @@ -0,0 +1,584 @@ +/* + * (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 (CONFIG_COMMANDS & CFG_CMD_NAND) +#ifdef CONFIG_NEW_NAND_CODE + +#include <nand.h> +#include <asm/arch/pxa-regs.h> + +#ifdef CFG_DFC_DEBUG1 +# define DFC_DEBUG1(fmt, args...) printf(fmt, ##args) +#else +# define DFC_DEBUG1(fmt, args...) +#endif + +#ifdef CFG_DFC_DEBUG2 +# define DFC_DEBUG2(fmt, args...) printf(fmt, ##args) +#else +# define DFC_DEBUG2(fmt, args...) +#endif + +#ifdef CFG_DFC_DEBUG3 +# define DFC_DEBUG3(fmt, args...) printf(fmt, ##args) +#else +# define DFC_DEBUG3(fmt, args...) +#endif + +#define MIN(x, y) ((x < y) ? x : y) + +/* 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_oobinfo delta_oob = { + .useecc = MTD_NANDECC_AUTOPL_USR, /* MTD_NANDECC_PLACEONLY, */ + .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 *mtdinfo, int cmd) +{ + 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]; + NDDB = *long_buf; + } + } + if(rest) { + printf("dfc_write_buf: ERROR, writing non 4-byte aligned data.\n"); + } + return; +} + + +/* + * These functions are quite problematic for the DFC. Luckily they are + * not used in the current nand code, except for nand_command, which + * we've defined our own anyway. The problem is, that we always need + * to write 4 bytes to the DFC Data Buffer, but in these functions we + * don't know if to buffer the bytes/half words until we've gathered 4 + * bytes or if to send them straight away. + * + * Solution: Don't use these with Mona's DFC and complain loudly. + */ +static void dfc_write_word(struct mtd_info *mtd, u16 word) +{ + printf("dfc_write_word: WARNING, this function does not work with the Monahans DFC!\n"); +} +static void dfc_write_byte(struct mtd_info *mtd, u_char byte) +{ + printf("dfc_write_byte: WARNING, this function does not work with the Monahans DFC!\n"); +} + +/* The original: + * static void dfc_read_buf(struct mtd_info *mtd, const u_char *buf, int len) + * + * Shouldn't this be "u_char * const buf" ? + */ +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 = 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_write_byte: 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 = NDDB; + dummy = 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 = 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 = OSCR; + us *= OSCR_CLK_FREQ; + + while (get_delta(start) < us) { + /* do nothing */ + } +} + +static void dfc_clear_nddb(void) +{ + NDCR &= ~NDCR_ND_RUN; + wait_us(CFG_NAND_OTHER_TO); +} + +/* wait_event with timeout */ +static unsigned long dfc_wait_event(unsigned long event) +{ + unsigned long ndsr, timeout, start = OSCR; + + if(!event) + return 0xff000000; + else if(event & (NDSR_CS0_CMDD | NDSR_CS0_BBD)) + timeout = CFG_NAND_PROG_ERASE_TO * OSCR_CLK_FREQ; + else + timeout = CFG_NAND_OTHER_TO * OSCR_CLK_FREQ; + + while(1) { + ndsr = NDSR; + if(ndsr & event) { + NDSR |= event; + break; + } + if(get_delta(start) > timeout) { + DFC_DEBUG1("dfc_wait_event: TIMEOUT waiting for event: 0x%x.\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++ <= CFG_NAND_SENDCMD_RETRY) { + /* Clear NDSR */ + NDSR = 0xFFF; + + /* set NDCR[NDRUN] */ + if(!(NDCR & NDCR_ND_RUN)) + NDCR |= NDCR_ND_RUN; + + 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, int state) +{ + unsigned long ndsr=0, event=0; + + 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: + NDCB0 = ndcb0; + NDCB0 = ndcb1; + NDCB0 = ndcb2; + + /* 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 */ + GPIO4 = 0x1; + + DF_ALE_WE1 = 0x00000001; + DF_ALE_WE2 = 0x00000001; + DF_nCS0 = 0x00000001; + DF_nCS1 = 0x00000001; + DF_nWE = 0x00000001; + DF_nRE = 0x00000001; + DF_IO0 = 0x00000001; + DF_IO8 = 0x00000001; + DF_IO1 = 0x00000001; + DF_IO9 = 0x00000001; + DF_IO2 = 0x00000001; + DF_IO10 = 0x00000001; + DF_IO3 = 0x00000001; + DF_IO11 = 0x00000001; + DF_IO4 = 0x00000001; + DF_IO12 = 0x00000001; + DF_IO5 = 0x00000001; + DF_IO13 = 0x00000001; + DF_IO6 = 0x00000001; + DF_IO14 = 0x00000001; + DF_IO7 = 0x00000001; + DF_IO15 = 0x00000001; + + DF_nWE = 0x1901; + DF_nRE = 0x1901; + DF_CLE_NOE = 0x1900; + DF_ALE_WE1 = 0x1901; + DF_INT_RnB = 0x1900; +} + +/* + * 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 + * - eccmode: 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. + */ +void 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) */ + CKENA |= (CKENA_4_NAND | CKENA_9_SMC); + +#undef CFG_TIMING_TIGHT +#ifndef CFG_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 /* CFG_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; + } + + NDTR0CS0 = (tCH << 19) | + (tCS << 16) | + (tWH << 11) | + (tWP << 8) | + (tRP_high << 6) | + (tRH << 3) | + (tRP << 0); + + NDTR1CS0 = (tR << 16) | + (tWHR << 4) | + (tAR << 0); + + /* 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 *\/ */ + + NDCR = (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 */ + + + /* wait 10 us due to cmd buffer clear reset */ + /* wait(10); */ + + + nand->hwcontrol = dfc_hwcontrol; +/* nand->dev_ready = dfc_device_ready; */ + nand->eccmode = NAND_ECC_SOFT; + nand->options = NAND_BUSWIDTH_16; + nand->waitfunc = dfc_wait; + nand->read_byte = dfc_read_byte; + nand->write_byte = dfc_write_byte; + nand->read_word = dfc_read_word; + nand->write_word = dfc_write_word; + nand->read_buf = dfc_read_buf; + nand->write_buf = dfc_write_buf; + + nand->cmdfunc = dfc_cmdfunc; + nand->autooob = &delta_oob; + nand->badblock_pattern = &delta_bbt_descr; +} + +#else + #error "U-Boot legacy NAND support not available for Monahans DFC." +#endif +#endif |