2 * (C) Copyright 2006 DENX Software Engineering
4 * See file CREDITS for list of people who contributed to this
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 #if (CONFIG_COMMANDS & CFG_CMD_NAND)
26 #ifdef CONFIG_NEW_NAND_CODE
29 #include <asm/arch/pxa-regs.h>
32 * not required for Monahans DFC
34 static void delta_hwcontrol(struct mtd_info *mtdinfo, int cmd)
39 /* read device ready pin */
40 static int delta_device_ready(struct mtd_info *mtdinfo)
50 * Write buf to the DFC Controller Data Buffer
52 static void delta_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
54 unsigned long bytes_multi = len & 0xfffffffc;
55 unsigned long rest = len & 0x3;
56 unsigned long *long_buf;
60 for(i=0; i<bytes_multi; i+=4) {
61 long_buf = (unsigned long*) &buf[i];
66 printf("delta_write_buf: ERROR, writing non 4-byte aligned data.\n");
73 * These functions are quite problematic for the DFC. Luckily they are
74 * not used in the current nand code, except for nand_command, which
75 * we've defined our own anyway. The problem is, that we always need
76 * to write 4 bytes to the DFC Data Buffer, but in these functions we
77 * don't know if to buffer the bytes/half words until we've gathered 4
78 * bytes or if to send them straight away.
80 * Solution: Don't use these with Mona's DFC and complain loudly.
82 static void delta_write_word(struct mtd_info *mtd, u16 word)
84 printf("delta_write_word: WARNING, this function does not work with the Monahans DFC!\n");
86 static void delta_write_byte(struct mtd_info *mtd, u_char byte)
88 printf("delta_write_byte: WARNING, this function does not work with the Monahans DFC!\n");
92 * static void delta_read_buf(struct mtd_info *mtd, const u_char *buf, int len)
94 * Shouldn't this be "u_char * const buf" ?
96 static void delta_read_buf(struct mtd_info *mtd, u_char* const buf, int len)
100 /* we have to be carefull not to overflow the buffer if len is
101 * not a multiple of 4 */
102 unsigned long bytes_multi = len & 0xfffffffc;
103 unsigned long rest = len & 0x3;
104 unsigned long *long_buf;
106 /* if there are any, first copy multiple of 4 bytes */
108 for(i=0; i<bytes_multi; i+=4) {
109 long_buf = (unsigned long*) &buf[i];
114 /* ...then the rest */
116 unsigned long rest_data = NDDB;
118 buf[i+j] = (u_char) ((rest_data>>j) & 0xff);
124 static void delta_read_word(struct mtd_info *mtd, u_char byte)
126 printf("delta_write_byte: UNIMPLEMENTED.\n");
129 /* global var, too bad: mk@tbd: move to ->priv pointer */
130 static unsigned long read_buf = 0;
131 static unsigned char bytes_read = 0;
133 static u_char delta_read_byte(struct mtd_info *mtd)
135 /* struct nand_chip *this = mtd->priv; */
138 if(bytes_read == 0) {
140 printk("delta_read_byte: 0x%x.\n", read_buf);
142 byte = (unsigned char) (read_buf>>(8 * bytes_read++));
146 printf("delta_read_byte: returning 0x%x.\n", byte);
151 static void wait(unsigned long us)
153 #define OSCR_CLK_FREQ 3.250 /* kHz */
155 unsigned long start = OSCR;
156 unsigned long delta = 0, cur;
161 if(cur < start) /* OSCR overflowed */
162 delta = cur + (start^0xffffffff);
168 /* poll the NAND Controller Status Register for event */
169 static void delta_wait_event(unsigned long event)
182 /* this is really monahans, not board specific ... */
183 static void delta_cmdfunc(struct mtd_info *mtd, unsigned command,
184 int column, int page_addr)
186 /* register struct nand_chip *this = mtd->priv; */
187 unsigned long ndcb0=0, ndcb1=0, ndcb2=0, event=0;
188 unsigned long what_the_hack;
190 /* clear the ugly byte read buffer */
198 /* apparently NDCR[NDRUN] needs to be set before writing to NDCBx */
201 /* wait for write command request
202 * hmm, might be nice if this could time-out. mk@tbd
205 if(NDSR & NDSR_WRCMDREQ) {
206 NDSR |= NDSR_WRCMDREQ; /* Ack */
211 /* if command is a double byte cmd, we set bit double cmd bit 19 */
212 /* command2 = (command>>8) & 0xFF; */
213 /* ndcb0 = command | ((command2 ? 1 : 0) << 19); *\/ */
217 ndcb0 = (NAND_CMD_READ0 | (4<<16));
218 column >>= 1; /* adjust for 16 bit bus */
219 ndcb1 = (((column>>1) & 0xff) |
220 ((page_addr<<8) & 0xff00) |
221 ((page_addr<<8) & 0xff0000) |
222 ((page_addr<<8) & 0xff000000)); /* make this 0x01000000 ? */
225 case NAND_CMD_READID:
226 printk("delta_cmdfunc: NAND_CMD_READID.\n");
227 ndcb0 = (NAND_CMD_READID | (3 << 21) | (1 << 16)); /* addr cycles*/
230 case NAND_CMD_PAGEPROG:
231 printk("delta_cmdfunc: NAND_CMD_PAGEPROG.\n");
232 ndcb0 = (NAND_CMD_PAGEPROG | (1 << 21));
234 case NAND_CMD_ERASE1:
235 case NAND_CMD_ERASE2:
236 printf("delta_cmdfunc: NAND_CMD_ERASEx unimplemented.\n");
239 /* send PAGE_PROG command(0x80) */
240 printf("delta_cmdfunc: NAND_CMD_SEQIN/PAGE_PROG.\n");
241 ndcb0 = (NAND_CMD_SEQIN | (1<<21) | (3<<16));
242 column >>= 1; /* adjust for 16 bit bus */
243 ndcb1 = (((column>>1) & 0xff) |
244 ((page_addr<<8) & 0xff00) |
245 ((page_addr<<8) & 0xff0000) |
246 ((page_addr<<8) & 0xff000000)); /* make this 0x01000000 ? */
249 /* case NAND_CMD_SEQIN_pointer_operation: */
251 /* /\* This is confusing because the command names are */
252 /* * different compared to the ones in the K9K12Q0C */
253 /* * datasheet. Infact this has nothing to do with */
254 /* * reading, as the but with page programming */
256 /* * Here we send the multibyte commands */
257 /* * cmd1=0x00, cmd2=0x80 (for programming main area) or */
258 /* * cmd1=0x50, cmd2=0x80 (for spare area) */
260 /* * When all data is written to the buffer, the page */
261 /* * program command (0x10) is sent to actually write */
265 /* printf("delta_cmdfunc: NAND_CMD_SEQIN pointer op called.\n"); */
267 /* ndcb0 = (NAND_CMD_SEQIN<<8) | (1<<21) | (1<<19) | (4<<16); */
268 /* if(column >= mtd->oobblock) { */
269 /* /\* OOB area *\/ */
270 /* column -= mtd->oobblock; */
271 /* ndcb0 |= NAND_CMD_READOOB; */
272 /* } else if (column < 256) { */
273 /* /\* First 256 bytes --> READ0 *\/ */
274 /* ndcb0 |= NAND_CMD_READ0; */
276 /* /\* Only for 8 bit devices - not delta!!! *\/ */
278 /* ndcb0 |= NAND_CMD_READ1; */
280 /* event = NDSR_WRDREQ; */
282 case NAND_CMD_STATUS:
283 /* oh, this is not nice. for some reason the real
284 * status byte is in the second read from the data
285 * buffer. The hack is to read the first byte right
286 * here, so the next read access by the nand code
287 * yields the right one.
289 ndcb0 = (NAND_CMD_STATUS | (4<<21));
294 delta_wait_event(event);
295 what_the_hack = NDDB;
299 printf("delta_cmdfunc: NAND_CMD_RESET unimplemented.\n");
302 printk("delta_cmdfunc: error, unsupported command.\n");
311 delta_wait_event(event);
316 static void delta_dfc_gpio_init()
318 printf("Setting up DFC GPIO's.\n");
320 /* no idea what is done here, see zylonite.c */
323 DF_ALE_WE1 = 0x00000001;
324 DF_ALE_WE2 = 0x00000001;
325 DF_nCS0 = 0x00000001;
326 DF_nCS1 = 0x00000001;
334 DF_IO10 = 0x00000001;
336 DF_IO11 = 0x00000001;
338 DF_IO12 = 0x00000001;
340 DF_IO13 = 0x00000001;
342 DF_IO14 = 0x00000001;
344 DF_IO15 = 0x00000001;
354 * Board-specific NAND initialization. The following members of the
355 * argument are board-specific (per include/linux/mtd/nand_new.h):
356 * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
357 * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
358 * - hwcontrol: hardwarespecific function for accesing control-lines
359 * - dev_ready: hardwarespecific function for accesing device ready/busy line
360 * - enable_hwecc?: function to enable (reset) hardware ecc generator. Must
361 * only be provided if a hardware ECC is available
362 * - eccmode: mode of ecc, see defines
363 * - chip_delay: chip dependent delay for transfering data from array to
365 * - options: various chip options. They can partly be set to inform
366 * nand_scan about special functionality. See the defines for further
368 * Members with a "?" were not set in the merged testing-NAND branch,
369 * so they are not set here either.
371 void board_nand_init(struct nand_chip *nand)
373 unsigned long tCH, tCS, tWH, tWP, tRH, tRP, tRP_high, tR, tWHR, tAR;
375 /* set up GPIO Control Registers */
376 delta_dfc_gpio_init();
378 /* turn on the NAND Controller Clock (104 MHz @ D0) */
379 CKENA |= (CKENA_4_NAND | CKENA_9_SMC);
382 /* printf("stupid loop start...\n"); */
384 /* printf("stupid loop end.\n"); */
387 /* NAND Timing Parameters (in ns) */
388 #define NAND_TIMING_tCH 10
389 #define NAND_TIMING_tCS 0
390 #define NAND_TIMING_tWH 20
391 #define NAND_TIMING_tWP 40
392 /* #define NAND_TIMING_tRH 20 */
393 /* #define NAND_TIMING_tRP 40 */
395 #define NAND_TIMING_tRH 25
396 #define NAND_TIMING_tRP 50
398 #define NAND_TIMING_tR 11123
399 #define NAND_TIMING_tWHR 110
400 #define NAND_TIMING_tAR 10
402 /* Maximum values for NAND Interface Timing Registers in DFC clock
404 #define DFC_MAX_tCH 7
405 #define DFC_MAX_tCS 7
406 #define DFC_MAX_tWH 7
407 #define DFC_MAX_tWP 7
408 #define DFC_MAX_tRH 7
409 #define DFC_MAX_tRP 15
410 #define DFC_MAX_tR 65535
411 #define DFC_MAX_tWHR 15
412 #define DFC_MAX_tAR 15
414 #define DFC_CLOCK 104 /* DFC Clock is 104 MHz */
415 #define DFC_CLK_PER_US DFC_CLOCK/1000 /* clock period in ns */
416 #define MIN(x, y) ((x < y) ? x : y)
419 tCH = MIN(((unsigned long) (NAND_TIMING_tCH * DFC_CLK_PER_US) + 1),
421 tCS = MIN(((unsigned long) (NAND_TIMING_tCS * DFC_CLK_PER_US) + 1),
423 tWH = MIN(((unsigned long) (NAND_TIMING_tWH * DFC_CLK_PER_US) + 1),
425 tWP = MIN(((unsigned long) (NAND_TIMING_tWP * DFC_CLK_PER_US) + 1),
427 tRH = MIN(((unsigned long) (NAND_TIMING_tRH * DFC_CLK_PER_US) + 1),
429 tRP = MIN(((unsigned long) (NAND_TIMING_tRP * DFC_CLK_PER_US) + 1),
431 tR = MIN(((unsigned long) (NAND_TIMING_tR * DFC_CLK_PER_US) + 1),
433 tWHR = MIN(((unsigned long) (NAND_TIMING_tWHR * DFC_CLK_PER_US) + 1),
435 tAR = MIN(((unsigned long) (NAND_TIMING_tAR * DFC_CLK_PER_US) + 1),
439 printf("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);
441 /* tRP value is split in the register */
449 NDTR0CS0 = (tCH << 19) |
457 NDTR1CS0 = (tR << 16) |
463 /* If it doesn't work (unlikely) think about:
465 * - chip select don't care
466 * - read id byte count
468 * Intentionally enabled by not setting bits:
471 * - cs don't care, see if we can enable later!
472 * - row address start position (after second cycle)
473 * - pages per block = 32
474 * - ND_RDY : clears command buffer
476 NDCR = (NDCR_SPARE_EN | /* use the spare area */
477 NDCR_DWIDTH_C | /* 16bit DFC data bus width */
478 NDCR_DWIDTH_M | /* 16 bit Flash device data bus width */
479 NDCR_NCSX | /* Chip select busy don't care */
480 (7 << 16) | /* read id count = 7 ???? mk@tbd */
481 NDCR_ND_ARB_EN | /* enable bus arbiter */
482 NDCR_RDYM | /* flash device ready ir masked */
483 NDCR_CS0_PAGEDM | /* ND_nCSx page done ir masked */
485 NDCR_CS0_CMDDM | /* ND_CSx command done ir masked */
487 NDCR_CS0_BBDM | /* ND_CSx bad block detect ir masked */
489 NDCR_DBERRM | /* double bit error ir masked */
490 NDCR_SBERRM | /* single bit error ir masked */
491 NDCR_WRDREQM | /* write data request ir masked */
492 NDCR_RDDREQM | /* read data request ir masked */
493 NDCR_WRCMDREQM); /* write command request ir masked */
496 /* wait 10 us due to cmd buffer clear reset */
500 nand->hwcontrol = delta_hwcontrol;
501 /* nand->dev_ready = delta_device_ready; */
502 nand->eccmode = NAND_ECC_SOFT;
503 nand->chip_delay = NAND_DELAY_US;
504 nand->options = NAND_BUSWIDTH_16;
506 nand->read_byte = delta_read_byte;
507 nand->write_byte = delta_write_byte;
508 nand->read_word = delta_read_word;
509 nand->write_word = delta_write_word;
510 nand->read_buf = delta_read_buf;
511 nand->write_buf = delta_write_buf;
512 nand->cmdfunc = delta_cmdfunc;
516 #error "U-Boot legacy NAND support not available for delta board."