/* * linux/drivers/mtd/nand/cmx270-nand.c * * Copyright (C) 2006 Compulab, Ltd. * Mike Rapoport <mike@compulab.co.il> * * Derived from drivers/mtd/nand/h1910.c * Copyright (C) 2002 Marius Gröger (mag@sysgo.de) * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de) * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Overview: * This is a device driver for the NAND flash device found on the * CM-X270 board. */ #include <linux/mtd/nand.h> #include <linux/mtd/partitions.h> #include <linux/slab.h> #include <linux/gpio.h> #include <linux/module.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/mach-types.h> #include <mach/pxa2xx-regs.h> #define GPIO_NAND_CS (11) #define GPIO_NAND_RB (89) /* MTD structure for CM-X270 board */ static struct mtd_info *cmx270_nand_mtd; /* remaped IO address of the device */ static void __iomem *cmx270_nand_io; /* * Define static partitions for flash device */ static struct mtd_partition partition_info[] = { [0] = { .name = "cmx270-0", .offset = 0, .size = MTDPART_SIZ_FULL } }; #define NUM_PARTITIONS (ARRAY_SIZE(partition_info)) static u_char cmx270_read_byte(struct mtd_info *mtd) { struct nand_chip *this = mtd->priv; return (readl(this->IO_ADDR_R) >> 16); } static void cmx270_write_buf(struct mtd_info *mtd, const u_char *buf, int len) { int i; struct nand_chip *this = mtd->priv; for (i=0; i<len; i++) writel((*buf++ << 16), this->IO_ADDR_W); } static void cmx270_read_buf(struct mtd_info *mtd, u_char *buf, int len) { int i; struct nand_chip *this = mtd->priv; for (i=0; i<len; i++) *buf++ = readl(this->IO_ADDR_R) >> 16; } static int cmx270_verify_buf(struct mtd_info *mtd, const u_char *buf, int len) { int i; struct nand_chip *this = mtd->priv; for (i=0; i<len; i++) if (buf[i] != (u_char)(readl(this->IO_ADDR_R) >> 16)) return -EFAULT; return 0; } static inline void nand_cs_on(void) { gpio_set_value(GPIO_NAND_CS, 0); } static void nand_cs_off(void) { dsb(); gpio_set_value(GPIO_NAND_CS, 1); } /* * hardware specific access to control-lines */ static void cmx270_hwcontrol(struct mtd_info *mtd, int dat, unsigned int ctrl) { struct nand_chip* this = mtd->priv; unsigned int nandaddr = (unsigned int)this->IO_ADDR_W; dsb(); if (ctrl & NAND_CTRL_CHANGE) { if ( ctrl & NAND_ALE ) nandaddr |= (1 << 3); else nandaddr &= ~(1 << 3); if ( ctrl & NAND_CLE ) nandaddr |= (1 << 2); else nandaddr &= ~(1 << 2); if ( ctrl & NAND_NCE ) nand_cs_on(); else nand_cs_off(); } dsb(); this->IO_ADDR_W = (void __iomem*)nandaddr; if (dat != NAND_CMD_NONE) writel((dat << 16), this->IO_ADDR_W); dsb(); } /* * read device ready pin */ static int cmx270_device_ready(struct mtd_info *mtd) { dsb(); return (gpio_get_value(GPIO_NAND_RB)); } /* * Main initialization routine */ static int __init cmx270_init(void) { struct nand_chip *this; int ret; if (!(machine_is_armcore() && cpu_is_pxa27x())) return -ENODEV; ret = gpio_request(GPIO_NAND_CS, "NAND CS"); if (ret) { pr_warning("CM-X270: failed to request NAND CS gpio\n"); return ret; } gpio_direction_output(GPIO_NAND_CS, 1); ret = gpio_request(GPIO_NAND_RB, "NAND R/B"); if (ret) { pr_warning("CM-X270: failed to request NAND R/B gpio\n"); goto err_gpio_request; } gpio_direction_input(GPIO_NAND_RB); /* Allocate memory for MTD device structure and private data */ cmx270_nand_mtd = kzalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL); if (!cmx270_nand_mtd) { pr_debug("Unable to allocate CM-X270 NAND MTD device structure.\n"); ret = -ENOMEM; goto err_kzalloc; } cmx270_nand_io = ioremap(PXA_CS1_PHYS, 12); if (!cmx270_nand_io) { pr_debug("Unable to ioremap NAND device\n"); ret = -EINVAL; goto err_ioremap; } /* Get pointer to private data */ this = (struct nand_chip *)(&cmx270_nand_mtd[1]); /* Link the private data with the MTD structure */ cmx270_nand_mtd->owner = THIS_MODULE; cmx270_nand_mtd->priv = this; /* insert callbacks */ this->IO_ADDR_R = cmx270_nand_io; this->IO_ADDR_W = cmx270_nand_io; this->cmd_ctrl = cmx270_hwcontrol; this->dev_ready = cmx270_device_ready; /* 15 us command delay time */ this->chip_delay = 20; this->ecc.mode = NAND_ECC_SOFT; /* read/write functions */ this->read_byte = cmx270_read_byte; this->read_buf = cmx270_read_buf; this->write_buf = cmx270_write_buf; this->verify_buf = cmx270_verify_buf; /* Scan to find existence of the device */ if (nand_scan (cmx270_nand_mtd, 1)) { pr_notice("No NAND device\n"); ret = -ENXIO; goto err_scan; } /* Register the partitions */ ret = mtd_device_parse_register(cmx270_nand_mtd, NULL, 0, partition_info, NUM_PARTITIONS); if (ret) goto err_scan; /* Return happy */ return 0; err_scan: iounmap(cmx270_nand_io); err_ioremap: kfree(cmx270_nand_mtd); err_kzalloc: gpio_free(GPIO_NAND_RB); err_gpio_request: gpio_free(GPIO_NAND_CS); return ret; } module_init(cmx270_init); /* * Clean up routine */ static void __exit cmx270_cleanup(void) { /* Release resources, unregister device */ nand_release(cmx270_nand_mtd); gpio_free(GPIO_NAND_RB); gpio_free(GPIO_NAND_CS); iounmap(cmx270_nand_io); /* Free the MTD device structure */ kfree (cmx270_nand_mtd); } module_exit(cmx270_cleanup); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>"); MODULE_DESCRIPTION("NAND flash driver for Compulab CM-X270 Module");