nuc900 nand flash mtd 驱动,请参考!
/* * Copyright © 2009 Nuvoton technology corporation. * * Wan ZongShun <mcuos.com@gmail.com> * * 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;version 2 of the License. * */ #include <linux/slab.h> #include <linux/init.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/platform_device.h> #include <linux/delay.h> #include <linux/clk.h> #include <linux/err.h> #include <linux/blkdev.h> #include <linux/mtd/mtd.h> #include <linux/mtd/nand.h> #include <linux/mtd/partitions.h> #include <linux/dma-mapping.h> #include <mach/map.h> #include <mach/regs-clock.h> #include <mach/regs-fmi.h> #include <mach/gnand/GNAND.h> #include <mach/nuc900_nand.h> #define REG_MFSEL (W90X900_VA_GCR + 0xC) /* #define REG_FMICSR 0x00 #define REG_SMCSR 0xa0 #define REG_SMISR 0xac #define REG_SMCMD 0xb0 #define REG_SMADDR 0xb4 #define REG_SMDATA 0xb8 */ #define RESET_FMI 0x01 #define NAND_EN 0x08 #define READYBUSY (0x01 << 18) #define SWRST 0x01 #define PSIZE (0x01 << 3) #define DMARWEN (0x03 << 1) #define BUSWID (0x01 << 4) #define ECC4EN (0x01 << 5) #define WP (0x01 << 24) #define NANDCS (0x03 << 25) #define ENDADDR (0x01 << 31) #define NANDCS1 (0x01 << 25) #define ECCBYTE512 3 #define ECCBYTE2K 3 /* DMAC Control and Status Register (DMACCSR) */ #define DMACCSR_DMACEN (1) #define DMACCSR_SW_RST (1<<1) #define DMACCSR_SG_EN1 (1<<2) #define DMACCSR_SG_EN2 (1<<3) #define DMACCSR_ATA_BUSY (1<<8) #define DMACCSR_FMI_BUSY (1<<9) /******************************************/ #define FMI_ERR_ID 0xFFFF0100 #define FMI_TIMEOUT (FMI_ERR_ID|0x01) /* NAND error */ #define FMI_SM_INIT_ERROR (FMI_ERR_ID|0x20) #define FMI_SM_RB_ERR (FMI_ERR_ID|0x21) #define FMI_SM_STATE_ERROR (FMI_ERR_ID|0x22) #define FMI_SM_ECC_ERROR (FMI_ERR_ID|0x23) #define FMI_SM_STATUS_ERR (FMI_ERR_ID|0x24) #define FMI_SM_ID_ERR (FMI_ERR_ID|0x25) #define FMI_SM_INVALID_BLOCK (FMI_ERR_ID|0x26) bool volatile _fmi_bIsSMDataReady=0; //#define DEBUG_NAND //#define nuc900_nand_debug(fmt,args...) printk(fmt,##args) #define nuc900_nand_debug(fmt,args...) #define read_data_reg(dev) __raw_readl(REG_SMDATA) #define write_data_reg(dev, val) __raw_writel((val), REG_SMDATA) #define write_cmd_reg(dev, val) __raw_writel((val), REG_SMCMD) #define write_addr_reg(dev, val) __raw_writel((val), REG_SMADDR) #define nuc900_nand_read(reg) __raw_readl(reg) struct nuc900_nand { struct mtd_info mtd; struct nand_chip chip; void __iomem *reg; struct clk *clk; spinlock_t lock; }; extern struct semaphore fmi_sem; extern struct semaphore dmac_sem; #define NUM_PARTITIONS 4 /*请保证分区的总和数和nandflash的实际大小一致，目前开发板上的nandflash是128M*/ #define UBOOT_SIZE SZ_1M*1 #define KERNEL_SIZE SZ_1M*5 #define ROOT_SIZE SZ_1M*44 #define USER_SIZE SZ_1M*78 /*vitual addr and phy addr for dma */ static unsigned char * nand_vaddr = NULL; static unsigned char * nand_phyaddr = NULL; static const struct mtd_partition partitions[] = { { .name = "U-boot", .offset = 0, .size = UBOOT_SIZE }, { .name = "linux 2.6.35 kernel", .offset = UBOOT_SIZE, .size = KERNEL_SIZE }, { .name = "root", .offset = UBOOT_SIZE+KERNEL_SIZE, .size = ROOT_SIZE }, { .name = "user", .offset = UBOOT_SIZE+KERNEL_SIZE+ROOT_SIZE, .size = USER_SIZE } }; static unsigned char nuc900_nand_read_byte(struct mtd_info *mtd) { unsigned char ret; struct nuc900_nand *nand; nand = container_of(mtd, struct nuc900_nand, mtd); __raw_writel( NAND_EN, REG_FMICSR); ret = (unsigned char)read_data_reg(nand); return ret; } static void nuc900_nand_read_buf(struct mtd_info *mtd, unsigned char *buf, int len) { int i; struct nand_chip *chip = mtd->priv; //nuc900_nand_debug("nuc900_nand_read_buf: len=%d ",len); __raw_writel( NAND_EN, REG_FMICSR); if(len==mtd->oobsize){// read oob data chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1); if(down_interruptible(&fmi_sem)) //jhe+ 2010.12.21 { printk("nuc900 mtd nand driver read buf sem error "); return; } for (i = 0; i < len; i++) buf[i] = __raw_readl(REG_SMDATA)& 0xff; #ifdef DEBUG_NAND nuc900_nand_debug("oob read "); for (i = 0; i < len; i++) nuc900_nand_debug(" 0x%02x |",buf[i]); nuc900_nand_debug(" "); #endif goto readout1; } if(down_interruptible(&fmi_sem)) //jhe+ 2010.12.21 { printk("nuc900 mtd nand driver read buf sem error "); return; } //normal page read use dma if (down_interruptible(&dmac_sem)) return ; while (__raw_readl(REG_DMACCSR)&DMACCSR_FMI_BUSY); //Wait IP finished... for safe __raw_writel((unsigned long)nand_phyaddr,REG_DMACSAR2); _fmi_bIsSMDataReady = 0; __raw_writel(__raw_readl(REG_SMCSR) | 0x02,REG_SMCSR); //enable DMA read while (!_fmi_bIsSMDataReady); up(&dmac_sem); memcpy(buf,nand_vaddr,len); readout1: up(&fmi_sem); } static void nuc900_nand_write_buf(struct mtd_info *mtd, const unsigned char *buf, int len) { int i; struct nand_chip *chip = mtd->priv; int length = mtd->oobsize; int dmanum = 0; //nuc900_nand_debug("nuc900nand write buf:len=%d ",len); __raw_writel( NAND_EN, REG_FMICSR); if(len==length){// write for oob chip->cmdfunc(mtd, NAND_CMD_RNDIN, mtd->writesize, -1); if(down_interruptible(&fmi_sem)) //jhe+ 2010.12.21 { printk("nuc900 mtd nand driver write buf sem error "); return; } #ifdef DEBUG_NAND nuc900_nand_debug("oobdata:len=%d ",len); for (i = 0; i < len; i++) nuc900_nand_debug(" 0x%02x |",buf[i]); nuc900_nand_debug(" "); #endif i=0; while(i<len){ __raw_writel(buf[i],REG_SMDATA); i=i+1; } goto write_out; } if(down_interruptible(&fmi_sem)) //jhe+ 2010.12.21 { printk("nuc900 mtd nand driver write buf sem error "); return; } //normal page write use dma while(dmanum < len)//give the first 512 to the dma space { nand_vaddr[dmanum] = buf[dmanum]; dmanum++; } while(dmanum < 2112) { nand_vaddr[dmanum] = 0xff; dmanum++; } #if 0 nuc900_nand_debug(" "); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_0)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_1)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_2)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_3)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_4)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_5)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_6)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_7)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_8)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_9)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_10)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_11)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_12)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_13)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_14)); nuc900_nand_debug(" 0x%02x |",__raw_readl(REG_SMRA_15)); nuc900_nand_debug(" "); #endif if (down_interruptible(&dmac_sem)) return ; //normal page write use dma while (__raw_readl(REG_DMACCSR)&DMACCSR_FMI_BUSY); //Wait IP finished... for safe __raw_writel((unsigned long)nand_phyaddr,REG_DMACSAR2); _fmi_bIsSMDataReady = 0; __raw_writel(__raw_readl(REG_SMCSR) | 0x04,REG_SMCSR); //enable DMA write while (!_fmi_bIsSMDataReady);//wait for dma finished //__raw_writel(__raw_readl(REG_SMISR)|0x01,REG_SMISR); //clear DMA finished flag // __raw_writel(0x11223344,REG_SMRA_15); up(&dmac_sem); write_out: up(&fmi_sem); return; } /* select chip */ static void nuc900_nand_select_chip(struct mtd_info *mtd, int chipnr) { struct nuc900_nand *nand; nand = container_of(mtd, struct nuc900_nand, mtd); if(down_interruptible(&fmi_sem)) //jhe+ 2010.12.21 { printk("nuc900 mtd nand driver select_chip sem error "); return ; } __raw_writel( NAND_EN, REG_FMICSR); switch (chipnr) { case -1://no chip selected __raw_writel(__raw_readl(REG_SMCSR) | NANDCS, REG_SMCSR); break; case 0://select nand chip 0 __raw_writel(__raw_readl(REG_SMCSR) & ~NANDCS, REG_SMCSR); break; case 1://select nand chip 1 __raw_writel((__raw_readl(REG_SMCSR) & (~NANDCS))| NANDCS1, REG_SMCSR); break; default: BUG(); } up(&fmi_sem); } static int nuc900_check_rb(struct nuc900_nand *nand) { unsigned int val; spin_lock(&nand->lock); __raw_writel( NAND_EN, REG_FMICSR); val = __raw_readl(REG_SMISR ); val &= READYBUSY; spin_unlock(&nand->lock); return val; } static int nuc900_nand_devready(struct mtd_info *mtd) { struct nuc900_nand *nand; int ready; nand = container_of(mtd, struct nuc900_nand, mtd); __raw_writel( NAND_EN, REG_FMICSR); ready = (nuc900_check_rb(nand)) ? 1 : 0; return ready; } /* functions */ int fmiSMCheckRB(void) { __raw_writel( NAND_EN, REG_FMICSR); while (1) { if (__raw_readl(REG_SMISR) & 0x400) { __raw_writel(0x400,REG_SMISR); return 1; } } return 0; } static void nuc900_nand_command_lp(struct mtd_info *mtd, unsigned int command, int column, int page_addr) { register struct nand_chip *chip = mtd->priv; struct nuc900_nand *nand; //nuc900_nand_debug("command=0x%x,column=0x%x,page_addr=0x%x ",command,column,page_addr); nand = container_of(mtd, struct nuc900_nand, mtd); // enable SM __raw_writel( NAND_EN, REG_FMICSR); if (command == NAND_CMD_READOOB) { column += mtd->writesize; command = NAND_CMD_READ0; } if((command == NAND_CMD_READ0)||(command ==NAND_CMD_SEQIN)){ //nuc900_nand_debug("clear R/B flag before cmd "); /* clear R/B flag */ while (!(__raw_readl(REG_SMISR) & 0x40000)); __raw_writel(0x400, REG_SMISR); } write_cmd_reg(nand, command & 0xff); if (column != -1 || page_addr != -1) { if (column != -1) { if (chip->options & NAND_BUSWIDTH_16) column >>= 1; write_addr_reg(nand, column); write_addr_reg(nand, column >> 8 | ENDADDR); } if (page_addr != -1) { write_addr_reg(nand, page_addr); if (chip->chipsize > (128 << 20)) { write_addr_reg(nand, page_addr >> 8); write_addr_reg(nand, page_addr >> 16 | ENDADDR); } else { write_addr_reg(nand, page_addr >> 8 | ENDADDR); } } } switch (command) { case NAND_CMD_CACHEDPROG: case NAND_CMD_ERASE1: case NAND_CMD_ERASE2: case NAND_CMD_SEQIN: case NAND_CMD_RNDIN: case NAND_CMD_DEPLETE1: //nuc900_nand_debug("command=0x%x ",command); return; case NAND_CMD_PAGEPROG: fmiSMCheckRB(); return; case NAND_CMD_STATUS: if (__raw_readl(REG_SMDATA) & 0x01) { // 1:fail; 0:pass // printk("Nand Status error!! "); return; } return; case NAND_CMD_STATUS_ERROR: case NAND_CMD_STATUS_ERROR0: case NAND_CMD_STATUS_ERROR1: case NAND_CMD_STATUS_ERROR2: case NAND_CMD_STATUS_ERROR3: udelay(chip->chip_delay); return; case NAND_CMD_RESET: if (chip->dev_ready) break; udelay(chip->chip_delay); write_cmd_reg(nand, NAND_CMD_STATUS); write_cmd_reg(nand, command); while (!nuc900_check_rb(nand)) ; return; case NAND_CMD_RNDOUT: write_cmd_reg(nand, NAND_CMD_RNDOUTSTART); return; case NAND_CMD_READ0: write_cmd_reg(nand, NAND_CMD_READSTART); fmiSMCheckRB(); break; default: if (!chip->dev_ready) { udelay(chip->chip_delay); return; } } /* Apply this short delay always to ensure that we do wait tWB in * any case on any machine. */ //ndelay(100); while (!chip->dev_ready(mtd)) ; } // SM functions int fmiSM_Reset(void) { u32 volatile i; __raw_writel( NAND_EN, REG_FMICSR); __raw_writel(0xff,REG_SMCMD); for (i=100; i>0; i--); if (!fmiSMCheckRB()) return -1; return 0; } static void nuc900_nand_enable(struct nuc900_nand *nand) { unsigned int val; if(down_interruptible(&fmi_sem)) //jhe+ 2010.12.21 { printk("nuc900 mtd nand driver nand_enable sem error "); return; } spin_lock(&nand->lock); // enable SM __raw_writel( 0x3050b, REG_SMTCR );//set timer control __raw_writel( NAND_EN, REG_FMICSR); /* init SM interface */ __raw_writel((__raw_readl(REG_SMCSR)&0xf8ffffc0), REG_SMCSR); // disable ecc4 fmiSM_Reset(); __raw_writel((__raw_readl(REG_SMCSR)&0xfffffff0)|0x01000008, REG_SMCSR); // psize:2048; wp# set 1 // __raw_writel(0x01, REG_SMIER);//enable dma interrupter spin_unlock(&nand->lock); up(&fmi_sem); } static irqreturn_t fmi_interrupt(int irq, void *devid) { unsigned int volatile isr; // SM interrupt status isr = __raw_readl(REG_SMISR); ///printk("fmi_interrupt "); //DMA read/write transfer is done if (isr & 0x01) { _fmi_bIsSMDataReady = 1; __raw_writel(0x01,REG_SMISR); return IRQ_HANDLED; } else { return IRQ_NONE; } } static int __devinit nuc900_nand_probe(struct platform_device *pdev) { struct nuc900_nand *nuc900_nand; struct mtd_info *mtd; struct nand_chip *chip; int retval; struct resource *res; nuc900_nand_debug("nuc900_nand_probe in "); nand_vaddr = (unsigned char *) dma_alloc_coherent(NULL,2112, (dma_addr_t *) &nand_phyaddr, GFP_KERNEL); if(nand_vaddr == NULL){ printk(KERN_ERR "NUC900_nand: failed to allocate ram for nand data. "); return -ENOMEM; } retval = 0; /* Allocate memory for the device structure (and zero it) */ nuc900_nand = kzalloc(sizeof(struct nuc900_nand), GFP_KERNEL); if (!nuc900_nand){ printk(KERN_ERR "NUC900_nand: failed to allocate device structure. "); return -ENOMEM; } mtd=&nuc900_nand->mtd; chip = &(nuc900_nand->chip); chip->priv = nuc900_nand; /* link the private data structures */ mtd->priv = chip; mtd->owner = THIS_MODULE; spin_lock_init(&nuc900_nand->lock); __raw_writel(__raw_readl(REG_CLKEN) | 0x30,REG_CLKEN); __raw_writel(((__raw_readl(REG_MFSEL) & 0xFFFFFFF3) | 0x00000004),REG_MFSEL); /* select NAND function pins */ if (request_irq(20, fmi_interrupt, IRQF_SHARED, "900_NAND", &pdev->dev)) { printk("NAND: Request IRQ error "); retval = -ENOENT; goto fail1; } if (down_interruptible(&dmac_sem)){ retval = -ENOENT; goto fail1; } while (__raw_readl(REG_DMACCSR)&DMACCSR_FMI_BUSY); //Wait IP finished... for safe // DMAC Initial __raw_writel(0x00000003, REG_DMACCSR); //Enable DMAC __raw_writel(0x00000001, REG_DMACCSR); // Enable target abort interrupt generation during DMA transfer. __raw_writel(0x00000001, REG_DMACIER); up(&dmac_sem); /* init SM interface */ __raw_writel((__raw_readl(REG_SMCSR)&0xf8ffffc0),REG_SMCSR); // disable ecc4 if (down_interruptible(&dmac_sem)){ retval = -ENOENT; goto fail1; } while (__raw_readl(REG_DMACCSR)&DMACCSR_FMI_BUSY); //Wait IP finished... for safe // enable all __raw_writel(__raw_readl(REG_DMACCSR) | DMACCSR_DMACEN, REG_DMACCSR); //enable DMAC for FMI /* enable all interrupt */ __raw_writel(DMACIER_TABORT_IE, REG_DMACIER); //Enable target abort interrupt generation during DMA transfer __raw_writel(FMIIER_DTA_IE, REG_FMIIER); //Enable DMAC READ/WRITE target abort interrupt generation up(&dmac_sem); chip->cmdfunc = nuc900_nand_command_lp; chip->dev_ready = nuc900_nand_devready; chip->read_byte = nuc900_nand_read_byte; chip->write_buf = nuc900_nand_write_buf; chip->read_buf = nuc900_nand_read_buf; chip->select_chip = nuc900_nand_select_chip; chip->chip_delay = 50; chip->options = 0; chip->ecc.mode = NAND_ECC_SOFT; chip->ecc.size = 256; chip->ecc.bytes = 3; platform_set_drvdata(pdev, nuc900_nand); nuc900_nand_enable(nuc900_nand); nuc900_nand_debug("REG_SMCSR=0x%x,REG_SMIER=0x%x,SMTCR=0x%x ",__raw_readl(REG_SMCSR),__raw_readl(REG_SMIER),__raw_readl(REG_SMTCR)); /* first scan to find the device and get the page size */ if (nand_scan_ident(mtd, 1, NULL)) { retval = -ENXIO; goto err_scan_ident; } //chip->ecc.bytes = CONFIG_SYS_NAND_ECCBYTES; /* ECC is calculated for the whole page (1 step) */ //chip->ecc.size = mtd->writesize; /* set ECC page size */ switch (mtd->writesize) { case 512: __raw_writel( __raw_readl(REG_SMCSR) & ( ~PSIZE ), REG_SMCSR ); // psize:512; wp# set 1 //chip->ecc.bytes =ECCBYTE512; break; case 2048: __raw_writel( __raw_readl(REG_SMCSR)|PSIZE , REG_SMCSR ); // psize:2048; wp# set 1 //chip->ecc.bytes =ECCBYTE2K; break; default: /* page size not handled by HW ECC */ /* switching back to soft ECC */ chip->ecc.mode = NAND_ECC_SOFT; chip->ecc.calculate = NULL; chip->ecc.correct = NULL; chip->ecc.hwctl = NULL; chip->ecc.read_page = NULL; chip->ecc.postpad = 0; chip->ecc.prepad = 0; chip->ecc.bytes = 0; break; } /* second phase scan */ if (nand_scan_tail(mtd)) { dma_free_coherent(NULL, 2112, nand_vaddr, (dma_addr_t )nand_phyaddr); retval = -ENXIO; goto fail3; } add_mtd_partitions(mtd, partitions, ARRAY_SIZE(partitions)); return retval; fail3: nuc900_nand_debug("nuc900_nand_probe fail3 "); //iounmap(nuc900_nand->reg); err_scan_ident: platform_set_drvdata(pdev, NULL); fail2: //nuc900_nand_debug("nuc900_nand_probe fail2 "); //release_mem_region(res->start, resource_size(res)); fail1: nuc900_nand_debug("nuc900_nand_probe fail1 "); kfree(nuc900_nand); return retval; } static int __devexit nuc900_nand_remove(struct platform_device *pdev) { struct nuc900_nand *nuc900_nand = platform_get_drvdata(pdev); //struct resource *res; struct mtd_info *mtd = &nuc900_nand->mtd; nand_release(mtd); //iounmap(nuc900_nand->reg); //res = platform_get_resource(pdev, IORESOURCE_MEM, 0); //release_mem_region(res->start, resource_size(res)); //clk_disable(nuc900_nand->clk); //clk_put(nuc900_nand->clk); free_irq(IRQ_FMI, NULL); kfree(nuc900_nand); /* Free dma space */ dma_free_coherent(NULL, 2112, nand_vaddr, (dma_addr_t )nand_phyaddr); platform_set_drvdata(pdev, NULL); return 0; } static struct platform_driver nuc900_nand_driver = { .probe = nuc900_nand_probe, .remove = __devexit_p(nuc900_nand_remove), .driver = { .name = "nuc900-nand", .owner = THIS_MODULE, }, }; static int __init nuc900_nand_init(void) { return platform_driver_register(&nuc900_nand_driver); } static void __exit nuc900_nand_exit(void) { platform_driver_unregister(&nuc900_nand_driver); } module_init(nuc900_nand_init); module_exit(nuc900_nand_exit); MODULE_AUTHOR("Tanshi Li <dolphin96011@gmail.com>"); MODULE_DESCRIPTION("w90p910/NUC9xx nand driver!"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:nuc900-nand");