diff options
Diffstat (limited to 'board/delta')
| -rw-r--r-- | board/delta/nand.c | 212 |
1 files changed, 158 insertions, 54 deletions
diff --git a/board/delta/nand.c b/board/delta/nand.c index da6430d..ef78e30 100644 --- a/board/delta/nand.c +++ b/board/delta/nand.c @@ -46,6 +46,48 @@ static int delta_device_ready(struct mtd_info *mtdinfo) return 0; } +/* + * Write buf to the DFC Controller Data Buffer + */ +static void delta_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; + + if(bytes_multi) { + for(i=0; i<bytes_multi; i+=4) { + long_buf = (unsigned long*) &buf[i]; + NDDB = *long_buf; + } + } + if(rest) { + printf("delta_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 delta_write_word(struct mtd_info *mtd, u16 word) +{ + printf("delta_write_word: WARNING, this function does not work with the Monahans DFC!\n"); +} +static void delta_write_byte(struct mtd_info *mtd, u_char byte) +{ + printf("delta_write_byte: WARNING, this function does not work with the Monahans DFC!\n"); +} + /* The original: * static void delta_read_buf(struct mtd_info *mtd, const u_char *buf, int len) * @@ -57,14 +99,14 @@ static void delta_read_buf(struct mtd_info *mtd, u_char* const buf, int len) /* we have to be carefull not to overflow the buffer if len is * not a multiple of 4 */ - unsigned long num_words = len & 0xfffffffc; + unsigned long bytes_multi = len & 0xfffffffc; unsigned long rest = len & 0x3; + unsigned long *long_buf; /* if there are any, first copy multiple of 4 bytes */ - if(num_words) { - for(i=0; i<num_words; i+=4) { - unsigned long *long_buf = &buf[i]; -/* ((unsigned long *) &buf[i]) = NDDB; */ + if(bytes_multi) { + for(i=0; i<bytes_multi; i+=4) { + long_buf = (unsigned long*) &buf[i]; *long_buf = NDDB; } } @@ -72,30 +114,22 @@ static void delta_read_buf(struct mtd_info *mtd, u_char* const buf, int len) /* ...then the rest */ if(rest) { unsigned long rest_data = NDDB; - for(j=0;j<rest;j++) + for(j=0;j<rest; j++) buf[i+j] = (u_char) ((rest_data>>j) & 0xff); } return; } -/* global var, too bad */ +static void delta_read_word(struct mtd_info *mtd, u_char byte) +{ + printf("delta_write_byte: UNIMPLEMENTED.\n"); +} + +/* global var, too bad: mk@tbd: move to ->priv pointer */ static unsigned long read_buf = 0; static unsigned char bytes_read = 0; -/* wait for read request */ -static void delta_wait_event(unsigned long event) -{ - if(!event) - return; - - while(1) { - if(NDSR & event) { - NDSR |= event; - break; - } - } -} static u_char delta_read_byte(struct mtd_info *mtd) { /* struct nand_chip *this = mtd->priv; */ @@ -113,16 +147,50 @@ static u_char delta_read_byte(struct mtd_info *mtd) return byte; } +/* delay function */ +static void wait(unsigned long us) +{ +#define OSCR_CLK_FREQ 3.250 /* kHz */ + + unsigned long start = OSCR; + unsigned long delta = 0, cur; + us *= OSCR_CLK_FREQ; + + while (delta < us) { + cur = OSCR; + if(cur < start) /* OSCR overflowed */ + delta = cur + (start^0xffffffff); + else + delta = cur - start; + } +} + +/* poll the NAND Controller Status Register for event */ +static void delta_wait_event(unsigned long event) +{ + if(!event) + return; + + while(1) { + if(NDSR & event) { + NDSR |= event; + break; + } + } +} + /* this is really monahans, not board specific ... */ static void delta_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; + unsigned long what_the_hack; /* clear the ugly byte read buffer */ bytes_read = 0; read_buf = 0; + /* Clear NDSR */ NDSR = 0xFFF; @@ -160,29 +228,76 @@ static void delta_cmdfunc(struct mtd_info *mtd, unsigned command, event = NDSR_RDDREQ; break; case NAND_CMD_PAGEPROG: + printk("delta_cmdfunc: NAND_CMD_PAGEPROG.\n"); + ndcb0 = (NAND_CMD_PAGEPROG | (1 << 21)); break; case NAND_CMD_ERASE1: case NAND_CMD_ERASE2: + printf("delta_cmdfunc: NAND_CMD_ERASEx unimplemented.\n"); break; case NAND_CMD_SEQIN: - ndcb0 = (NAND_CMD_SEQIN<<8) | (1<<19) | (4<<16); - if(column >= mtd->oobblock) { - /* OOB area */ - column -= mtd->oobblock; - ndcb0 |= NAND_CMD_READOOB; - } else if (column < 256) { - /* First 256 bytes --> READ0 */ - ndcb0 |= NAND_CMD_READ0; - } else { - /* Only for 8 bit devices - not delta!!! */ - column -= 256; - ndcb0 |= NAND_CMD_READ1; - } + /* send PAGE_PROG command(0x80) */ + printf("delta_cmdfunc: NAND_CMD_SEQIN/PAGE_PROG.\n"); + ndcb0 = (NAND_CMD_SEQIN | (1<<21) | (3<<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; break; +/* case NAND_CMD_SEQIN_pointer_operation: */ + +/* /\* This is confusing because the command names are */ +/* * different compared to the ones in the K9K12Q0C */ +/* * datasheet. Infact this has nothing to do with */ +/* * reading, as the but with page programming */ +/* * (writing). */ +/* * Here we send the multibyte commands */ +/* * cmd1=0x00, cmd2=0x80 (for programming main area) or */ +/* * cmd1=0x50, cmd2=0x80 (for spare area) */ +/* * */ +/* * When all data is written to the buffer, the page */ +/* * program command (0x10) is sent to actually write */ +/* * the data. */ +/* *\/ */ + +/* printf("delta_cmdfunc: NAND_CMD_SEQIN pointer op called.\n"); */ + +/* ndcb0 = (NAND_CMD_SEQIN<<8) | (1<<21) | (1<<19) | (4<<16); */ +/* if(column >= mtd->oobblock) { */ +/* /\* OOB area *\/ */ +/* column -= mtd->oobblock; */ +/* ndcb0 |= NAND_CMD_READOOB; */ +/* } else if (column < 256) { */ +/* /\* First 256 bytes --> READ0 *\/ */ +/* ndcb0 |= NAND_CMD_READ0; */ +/* } else { */ +/* /\* Only for 8 bit devices - not delta!!! *\/ */ +/* column -= 256; */ +/* ndcb0 |= NAND_CMD_READ1; */ +/* } */ +/* event = NDSR_WRDREQ; */ +/* break; */ case NAND_CMD_STATUS: - return; + /* oh, this is not nice. for some reason the real + * status byte is in the second read from the data + * buffer. The hack is to read the first byte right + * here, so the next read access by the nand code + * yields the right one. + */ + ndcb0 = (NAND_CMD_STATUS | (4<<21)); + event = NDSR_RDDREQ; + NDCB0 = ndcb0; + NDCB0 = ndcb1; + NDCB0 = ndcb2; + delta_wait_event(event); + what_the_hack = NDDB; + goto end; + break; case NAND_CMD_RESET: - return; + printf("delta_cmdfunc: NAND_CMD_RESET unimplemented.\n"); + break; default: printk("delta_cmdfunc: error, unsupported command.\n"); return; @@ -194,6 +309,8 @@ static void delta_cmdfunc(struct mtd_info *mtd, unsigned command, /* wait for event */ delta_wait_event(event); + end: + return; } static void delta_dfc_gpio_init() @@ -251,23 +368,6 @@ static void delta_dfc_gpio_init() * Members with a "?" were not set in the merged testing-NAND branch, * so they are not set here either. */ -void wait(unsigned long us) -{ -#define OSCR_CLK_FREQ 3.250 /* kHz */ - - unsigned long start = OSCR; - unsigned long delta = 0, cur; - us *= OSCR_CLK_FREQ; - - while (delta < us) { - cur = OSCR; - if(cur < start) /* OSCR overflowed */ - delta = cur + (start^0xffffffff); - else - delta = cur - start; - } -} - void board_nand_init(struct nand_chip *nand) { unsigned long tCH, tCS, tWH, tWP, tRH, tRP, tRP_high, tR, tWHR, tAR; @@ -402,13 +502,17 @@ void board_nand_init(struct nand_chip *nand) nand->eccmode = NAND_ECC_SOFT; nand->chip_delay = NAND_DELAY_US; nand->options = NAND_BUSWIDTH_16; + nand->read_byte = delta_read_byte; + nand->write_byte = delta_write_byte; + nand->read_word = delta_read_word; + nand->write_word = delta_write_word; nand->read_buf = delta_read_buf; + nand->write_buf = delta_write_buf; nand->cmdfunc = delta_cmdfunc; - /* nand->options = NAND_SAMSUNG_LP_OPTIONS; */ } #else -#error "U-Boot legacy NAND support not available for delta board." + #error "U-Boot legacy NAND support not available for delta board." #endif #endif |