diff options
Diffstat (limited to 'board/zylonite/nand.c')
| -rw-r--r-- | board/zylonite/nand.c | 562 |
1 files changed, 0 insertions, 562 deletions
diff --git a/board/zylonite/nand.c b/board/zylonite/nand.c deleted file mode 100644 index 71d18a6..0000000 --- a/board/zylonite/nand.c +++ /dev/null @@ -1,562 +0,0 @@ -/* - * (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> -#include <asm/io.h> - -#if defined(CONFIG_CMD_NAND) - -#include <nand.h> -#include <asm/arch/pxa-regs.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; -} - - -/* 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 = 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 - * - cmd_ctrl: 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 |