/* * (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 #if (CONFIG_COMMANDS & CFG_CMD_NAND) #ifdef CONFIG_NEW_NAND_CODE #include #include /* * hardware specific access to control-lines * function borrowed from Linux 2.6 (drivers/mtd/nand/ppchameleonevb.c) */ static void delta_hwcontrol(struct mtd_info *mtdinfo, int cmd) { #if 0 struct nand_chip *this = mtdinfo->priv; ulong base = (ulong) this->IO_ADDR_W; switch(cmd) { case NAND_CTL_SETCLE: MACRO_NAND_CTL_SETCLE((unsigned long)base); break; case NAND_CTL_CLRCLE: MACRO_NAND_CTL_CLRCLE((unsigned long)base); break; case NAND_CTL_SETALE: MACRO_NAND_CTL_SETALE((unsigned long)base); break; case NAND_CTL_CLRALE: MACRO_NAND_CTL_CLRALE((unsigned long)base); break; case NAND_CTL_SETNCE: MACRO_NAND_ENABLE_CE((unsigned long)base); break; case NAND_CTL_CLRNCE: MACRO_NAND_DISABLE_CE((unsigned long)base); break; } #endif } /* read device ready pin */ static int delta_device_ready(struct mtd_info *mtdinfo) { if(NDSR & NDSR_RDY) return 1; else return 0; #if 0 struct nand_chip *this = mtdinfo->priv; ulong rb_gpio_pin; /* use the base addr to find out which chip are we dealing with */ switch((ulong) this->IO_ADDR_W) { case CFG_NAND0_BASE: rb_gpio_pin = CFG_NAND0_RDY; break; case CFG_NAND1_BASE: rb_gpio_pin = CFG_NAND1_RDY; break; default: /* this should never happen */ return 0; break; } if (in32(GPIO0_IR) & rb_gpio_pin) return 1; #endif return 0; } static u_char delta_read_byte(struct mtd_info *mtd) { /* struct nand_chip *this = mtd->priv; */ unsigned long tmp; /* wait for read request */ while(1) { if(NDSR & NDSR_RDDREQ) { NDSR |= NDSR_RDDREQ; break; } } tmp = NDDB; printk("delta_read_byte: 0x%x.\n", tmp); return (u_char) tmp; } /* 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; uchar command2; /* Clear NDSR */ NDSR = 0xFFF; /* apparently NDCR[NDRUN] needs to be set before writing to NDCBx */ NDCR |= NDCR_ND_RUN; /* wait for write command request * hmm, might be nice if this could time-out. mk@tbd */ while(1) { if(NDSR & NDSR_WRCMDREQ) { NDSR |= NDSR_WRCMDREQ; /* Ack */ break; } } /* if command is a double byte cmd, we set bit double cmd bit 19 */ command2 = (command>>8) & 0xFF; ndcb0 = command | ((command2 ? 1 : 0) << 19); switch (command) { case NAND_CMD_READID: printk("delta_cmdfunc: NAND_CMD_READID.\n"); ndcb0 |= ((3 << 21) | (2 << 16)); break; case NAND_CMD_PAGEPROG: case NAND_CMD_ERASE1: case NAND_CMD_ERASE2: case NAND_CMD_SEQIN: case NAND_CMD_STATUS: return; case NAND_CMD_RESET: return; default: printk("delta_cmdfunc: error, unkown command issued.\n"); return; } NDCB0 = ndcb0; NDCB1 = ndcb1; NDCB2 = ndcb2; } /* * 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 */ /* turn on the NAND Controller Clock (104 MHz @ D0) */ CKENA |= (CKENA_4_NAND | CKENA_9_SMC); /* NAND Timing Parameters (in ns) */ #define NAND_TIMING_tCH 10 #define NAND_TIMING_tCS 0 #define NAND_TIMING_tWH 20 #define NAND_TIMING_tWP 40 #define NAND_TIMING_tRH 20 #define NAND_TIMING_tRP 40 #define NAND_TIMING_tR 11123 #define NAND_TIMING_tWHR 110 #define NAND_TIMING_tAR 10 /* Maximum values for NAND Interface Timing Registers in DFC clock * periods */ #define DFC_MAX_tCH 7 #define DFC_MAX_tCS 7 #define DFC_MAX_tWH 7 #define DFC_MAX_tWP 7 #define DFC_MAX_tRH 7 #define DFC_MAX_tRP 15 #define DFC_MAX_tR 65535 #define DFC_MAX_tWHR 15 #define DFC_MAX_tAR 15 #define DFC_CLOCK 104 /* DFC Clock is 104 MHz */ #define DFC_CLK_PER_US DFC_CLOCK/1000 /* clock period in ns */ #define MIN(x, y) ((x < y) ? x : y) 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); /* 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 */ NDCR = (NDCR_ND_ARB_EN | /* enable bus arbiter */ 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 */ NDCE_RDYM | /* flash device ready ir masked */ NDCE_CS0_PAGEDM | /* ND_nCSx page done ir masked */ NDCE_CS1_PAGEDM | NDCE_CS0_CMDDM | /* ND_CSx command done ir masked */ NDCE_CS1_CMDDM | NDCE_CS0_BBDM | /* ND_CSx bad block detect ir masked */ NDCE_CS1_BBDM | NDCE_DBERRM | /* double bit error ir masked */ NDCE_SBERRM | /* single bit error ir masked */ NDCE_WRDREQM | /* write data request ir masked */ NDCE_RDDREQM | /* read data request ir masked */ NDCE_WRCMDREQM); /* write command request ir masked */ nand->hwcontrol = delta_hwcontrol; nand->dev_ready = delta_device_ready; nand->eccmode = NAND_ECC_SOFT; nand->chip_delay = NAND_DELAY_US; nand->options = NAND_BUSWIDTH_16; nand->read_byte = delta_read_byte; nand->cmdfunc = delta_cmdfunc; /* nand->options = NAND_SAMSUNG_LP_OPTIONS; */ } #else #error "U-Boot legacy NAND support not available for delta board." #endif #endif