diff options
Diffstat (limited to 'drivers/mtd/nand/ppchameleonevb.c')
| -rw-r--r-- | drivers/mtd/nand/ppchameleonevb.c | 403 |
1 files changed, 403 insertions, 0 deletions
diff --git a/drivers/mtd/nand/ppchameleonevb.c b/drivers/mtd/nand/ppchameleonevb.c new file mode 100644 index 00000000..0ddd90e5 --- /dev/null +++ b/drivers/mtd/nand/ppchameleonevb.c @@ -0,0 +1,403 @@ +/* + * drivers/mtd/nand/ppchameleonevb.c + * + * Copyright (C) 2003 DAVE Srl (info@wawnet.biz) + * + * Derived from drivers/mtd/nand/edb7312.c + * + * + * 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 devices found on the + * PPChameleon/PPChameleonEVB system. + * PPChameleon options (autodetected): + * - BA model: no NAND + * - ME model: 32MB (Samsung K9F5608U0B) + * - HI model: 128MB (Samsung K9F1G08UOM) + * PPChameleonEVB options: + * - 32MB (Samsung K9F5608U0B) + */ + +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/partitions.h> +#include <asm/io.h> +#include <platforms/PPChameleonEVB.h> + +#undef USE_READY_BUSY_PIN +#define USE_READY_BUSY_PIN +/* see datasheets (tR) */ +#define NAND_BIG_DELAY_US 25 +#define NAND_SMALL_DELAY_US 10 + +/* handy sizes */ +#define SZ_4M 0x00400000 +#define NAND_SMALL_SIZE 0x02000000 +#define NAND_MTD_NAME "ppchameleon-nand" +#define NAND_EVB_MTD_NAME "ppchameleonevb-nand" + +/* GPIO pins used to drive NAND chip mounted on processor module */ +#define NAND_nCE_GPIO_PIN (0x80000000 >> 1) +#define NAND_CLE_GPIO_PIN (0x80000000 >> 2) +#define NAND_ALE_GPIO_PIN (0x80000000 >> 3) +#define NAND_RB_GPIO_PIN (0x80000000 >> 4) +/* GPIO pins used to drive NAND chip mounted on EVB */ +#define NAND_EVB_nCE_GPIO_PIN (0x80000000 >> 14) +#define NAND_EVB_CLE_GPIO_PIN (0x80000000 >> 15) +#define NAND_EVB_ALE_GPIO_PIN (0x80000000 >> 16) +#define NAND_EVB_RB_GPIO_PIN (0x80000000 >> 31) + +/* + * MTD structure for PPChameleonEVB board + */ +static struct mtd_info *ppchameleon_mtd = NULL; +static struct mtd_info *ppchameleonevb_mtd = NULL; + +/* + * Module stuff + */ +static unsigned long ppchameleon_fio_pbase = CFG_NAND0_PADDR; +static unsigned long ppchameleonevb_fio_pbase = CFG_NAND1_PADDR; + +#ifdef MODULE +module_param(ppchameleon_fio_pbase, ulong, 0); +module_param(ppchameleonevb_fio_pbase, ulong, 0); +#else +__setup("ppchameleon_fio_pbase=", ppchameleon_fio_pbase); +__setup("ppchameleonevb_fio_pbase=", ppchameleonevb_fio_pbase); +#endif + +/* + * Define static partitions for flash devices + */ +static struct mtd_partition partition_info_hi[] = { + { .name = "PPChameleon HI Nand Flash", + .offset = 0, + .size = 128 * 1024 * 1024 + } +}; + +static struct mtd_partition partition_info_me[] = { + { .name = "PPChameleon ME Nand Flash", + .offset = 0, + .size = 32 * 1024 * 1024 + } +}; + +static struct mtd_partition partition_info_evb[] = { + { .name = "PPChameleonEVB Nand Flash", + .offset = 0, + .size = 32 * 1024 * 1024 + } +}; + +#define NUM_PARTITIONS 1 + +/* + * hardware specific access to control-lines + */ +static void ppchameleon_hwcontrol(struct mtd_info *mtdinfo, int cmd, + unsigned int ctrl) +{ + struct nand_chip *chip = mtd->priv; + + if (ctrl & NAND_CTRL_CHANGE) { +#error Missing headerfiles. No way to fix this. -tglx + switch (cmd) { + case NAND_CTL_SETCLE: + MACRO_NAND_CTL_SETCLE((unsigned long)CFG_NAND0_PADDR); + break; + case NAND_CTL_CLRCLE: + MACRO_NAND_CTL_CLRCLE((unsigned long)CFG_NAND0_PADDR); + break; + case NAND_CTL_SETALE: + MACRO_NAND_CTL_SETALE((unsigned long)CFG_NAND0_PADDR); + break; + case NAND_CTL_CLRALE: + MACRO_NAND_CTL_CLRALE((unsigned long)CFG_NAND0_PADDR); + break; + case NAND_CTL_SETNCE: + MACRO_NAND_ENABLE_CE((unsigned long)CFG_NAND0_PADDR); + break; + case NAND_CTL_CLRNCE: + MACRO_NAND_DISABLE_CE((unsigned long)CFG_NAND0_PADDR); + break; + } + } + if (cmd != NAND_CMD_NONE) + writeb(cmd, chip->IO_ADDR_W); +} + +static void ppchameleonevb_hwcontrol(struct mtd_info *mtdinfo, int cmd, + unsigned int ctrl) +{ + struct nand_chip *chip = mtd->priv; + + if (ctrl & NAND_CTRL_CHANGE) { +#error Missing headerfiles. No way to fix this. -tglx + switch (cmd) { + case NAND_CTL_SETCLE: + MACRO_NAND_CTL_SETCLE((unsigned long)CFG_NAND1_PADDR); + break; + case NAND_CTL_CLRCLE: + MACRO_NAND_CTL_CLRCLE((unsigned long)CFG_NAND1_PADDR); + break; + case NAND_CTL_SETALE: + MACRO_NAND_CTL_SETALE((unsigned long)CFG_NAND1_PADDR); + break; + case NAND_CTL_CLRALE: + MACRO_NAND_CTL_CLRALE((unsigned long)CFG_NAND1_PADDR); + break; + case NAND_CTL_SETNCE: + MACRO_NAND_ENABLE_CE((unsigned long)CFG_NAND1_PADDR); + break; + case NAND_CTL_CLRNCE: + MACRO_NAND_DISABLE_CE((unsigned long)CFG_NAND1_PADDR); + break; + } + } + if (cmd != NAND_CMD_NONE) + writeb(cmd, chip->IO_ADDR_W); +} + +#ifdef USE_READY_BUSY_PIN +/* + * read device ready pin + */ +static int ppchameleon_device_ready(struct mtd_info *minfo) +{ + if (in_be32((volatile unsigned *)GPIO0_IR) & NAND_RB_GPIO_PIN) + return 1; + return 0; +} + +static int ppchameleonevb_device_ready(struct mtd_info *minfo) +{ + if (in_be32((volatile unsigned *)GPIO0_IR) & NAND_EVB_RB_GPIO_PIN) + return 1; + return 0; +} +#endif + +/* + * Main initialization routine + */ +static int __init ppchameleonevb_init(void) +{ + struct nand_chip *this; + void __iomem *ppchameleon_fio_base; + void __iomem *ppchameleonevb_fio_base; + + /********************************* + * Processor module NAND (if any) * + *********************************/ + /* Allocate memory for MTD device structure and private data */ + ppchameleon_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL); + if (!ppchameleon_mtd) { + printk("Unable to allocate PPChameleon NAND MTD device structure.\n"); + return -ENOMEM; + } + + /* map physical address */ + ppchameleon_fio_base = ioremap(ppchameleon_fio_pbase, SZ_4M); + if (!ppchameleon_fio_base) { + printk("ioremap PPChameleon NAND flash failed\n"); + kfree(ppchameleon_mtd); + return -EIO; + } + + /* Get pointer to private data */ + this = (struct nand_chip *)(&ppchameleon_mtd[1]); + + /* Initialize structures */ + memset(ppchameleon_mtd, 0, sizeof(struct mtd_info)); + memset(this, 0, sizeof(struct nand_chip)); + + /* Link the private data with the MTD structure */ + ppchameleon_mtd->priv = this; + ppchameleon_mtd->owner = THIS_MODULE; + + /* Initialize GPIOs */ + /* Pin mapping for NAND chip */ + /* + CE GPIO_01 + CLE GPIO_02 + ALE GPIO_03 + R/B GPIO_04 + */ + /* output select */ + out_be32((volatile unsigned *)GPIO0_OSRH, in_be32((volatile unsigned *)GPIO0_OSRH) & 0xC0FFFFFF); + /* three-state select */ + out_be32((volatile unsigned *)GPIO0_TSRH, in_be32((volatile unsigned *)GPIO0_TSRH) & 0xC0FFFFFF); + /* enable output driver */ + out_be32((volatile unsigned *)GPIO0_TCR, + in_be32((volatile unsigned *)GPIO0_TCR) | NAND_nCE_GPIO_PIN | NAND_CLE_GPIO_PIN | NAND_ALE_GPIO_PIN); +#ifdef USE_READY_BUSY_PIN + /* three-state select */ + out_be32((volatile unsigned *)GPIO0_TSRH, in_be32((volatile unsigned *)GPIO0_TSRH) & 0xFF3FFFFF); + /* high-impedecence */ + out_be32((volatile unsigned *)GPIO0_TCR, in_be32((volatile unsigned *)GPIO0_TCR) & (~NAND_RB_GPIO_PIN)); + /* input select */ + out_be32((volatile unsigned *)GPIO0_ISR1H, + (in_be32((volatile unsigned *)GPIO0_ISR1H) & 0xFF3FFFFF) | 0x00400000); +#endif + + /* insert callbacks */ + this->IO_ADDR_R = ppchameleon_fio_base; + this->IO_ADDR_W = ppchameleon_fio_base; + this->cmd_ctrl = ppchameleon_hwcontrol; +#ifdef USE_READY_BUSY_PIN + this->dev_ready = ppchameleon_device_ready; +#endif + this->chip_delay = NAND_BIG_DELAY_US; + /* ECC mode */ + this->ecc.mode = NAND_ECC_SOFT; + + /* Scan to find existence of the device (it could not be mounted) */ + if (nand_scan(ppchameleon_mtd, 1)) { + iounmap((void *)ppchameleon_fio_base); + ppchameleon_fio_base = NULL; + kfree(ppchameleon_mtd); + goto nand_evb_init; + } +#ifndef USE_READY_BUSY_PIN + /* Adjust delay if necessary */ + if (ppchameleon_mtd->size == NAND_SMALL_SIZE) + this->chip_delay = NAND_SMALL_DELAY_US; +#endif + + ppchameleon_mtd->name = "ppchameleon-nand"; + + /* Register the partitions */ + mtd_device_parse_register(ppchameleon_mtd, NULL, NULL, + ppchameleon_mtd->size == NAND_SMALL_SIZE ? + partition_info_me : partition_info_hi, + NUM_PARTITIONS); + + nand_evb_init: + /**************************** + * EVB NAND (always present) * + ****************************/ + /* Allocate memory for MTD device structure and private data */ + ppchameleonevb_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL); + if (!ppchameleonevb_mtd) { + printk("Unable to allocate PPChameleonEVB NAND MTD device structure.\n"); + if (ppchameleon_fio_base) + iounmap(ppchameleon_fio_base); + return -ENOMEM; + } + + /* map physical address */ + ppchameleonevb_fio_base = ioremap(ppchameleonevb_fio_pbase, SZ_4M); + if (!ppchameleonevb_fio_base) { + printk("ioremap PPChameleonEVB NAND flash failed\n"); + kfree(ppchameleonevb_mtd); + if (ppchameleon_fio_base) + iounmap(ppchameleon_fio_base); + return -EIO; + } + + /* Get pointer to private data */ + this = (struct nand_chip *)(&ppchameleonevb_mtd[1]); + + /* Initialize structures */ + memset(ppchameleonevb_mtd, 0, sizeof(struct mtd_info)); + memset(this, 0, sizeof(struct nand_chip)); + + /* Link the private data with the MTD structure */ + ppchameleonevb_mtd->priv = this; + + /* Initialize GPIOs */ + /* Pin mapping for NAND chip */ + /* + CE GPIO_14 + CLE GPIO_15 + ALE GPIO_16 + R/B GPIO_31 + */ + /* output select */ + out_be32((volatile unsigned *)GPIO0_OSRH, in_be32((volatile unsigned *)GPIO0_OSRH) & 0xFFFFFFF0); + out_be32((volatile unsigned *)GPIO0_OSRL, in_be32((volatile unsigned *)GPIO0_OSRL) & 0x3FFFFFFF); + /* three-state select */ + out_be32((volatile unsigned *)GPIO0_TSRH, in_be32((volatile unsigned *)GPIO0_TSRH) & 0xFFFFFFF0); + out_be32((volatile unsigned *)GPIO0_TSRL, in_be32((volatile unsigned *)GPIO0_TSRL) & 0x3FFFFFFF); + /* enable output driver */ + out_be32((volatile unsigned *)GPIO0_TCR, in_be32((volatile unsigned *)GPIO0_TCR) | NAND_EVB_nCE_GPIO_PIN | + NAND_EVB_CLE_GPIO_PIN | NAND_EVB_ALE_GPIO_PIN); +#ifdef USE_READY_BUSY_PIN + /* three-state select */ + out_be32((volatile unsigned *)GPIO0_TSRL, in_be32((volatile unsigned *)GPIO0_TSRL) & 0xFFFFFFFC); + /* high-impedecence */ + out_be32((volatile unsigned *)GPIO0_TCR, in_be32((volatile unsigned *)GPIO0_TCR) & (~NAND_EVB_RB_GPIO_PIN)); + /* input select */ + out_be32((volatile unsigned *)GPIO0_ISR1L, + (in_be32((volatile unsigned *)GPIO0_ISR1L) & 0xFFFFFFFC) | 0x00000001); +#endif + + /* insert callbacks */ + this->IO_ADDR_R = ppchameleonevb_fio_base; + this->IO_ADDR_W = ppchameleonevb_fio_base; + this->cmd_ctrl = ppchameleonevb_hwcontrol; +#ifdef USE_READY_BUSY_PIN + this->dev_ready = ppchameleonevb_device_ready; +#endif + this->chip_delay = NAND_SMALL_DELAY_US; + + /* ECC mode */ + this->ecc.mode = NAND_ECC_SOFT; + + /* Scan to find existence of the device */ + if (nand_scan(ppchameleonevb_mtd, 1)) { + iounmap((void *)ppchameleonevb_fio_base); + kfree(ppchameleonevb_mtd); + if (ppchameleon_fio_base) + iounmap(ppchameleon_fio_base); + return -ENXIO; + } + + ppchameleonevb_mtd->name = NAND_EVB_MTD_NAME; + + /* Register the partitions */ + mtd_device_parse_register(ppchameleonevb_mtd, NULL, NULL, + ppchameleon_mtd->size == NAND_SMALL_SIZE ? + partition_info_me : partition_info_hi, + NUM_PARTITIONS); + + /* Return happy */ + return 0; +} + +module_init(ppchameleonevb_init); + +/* + * Clean up routine + */ +static void __exit ppchameleonevb_cleanup(void) +{ + struct nand_chip *this; + + /* Release resources, unregister device(s) */ + nand_release(ppchameleon_mtd); + nand_release(ppchameleonevb_mtd); + + /* Release iomaps */ + this = (struct nand_chip *) &ppchameleon_mtd[1]; + iounmap((void *) this->IO_ADDR_R); + this = (struct nand_chip *) &ppchameleonevb_mtd[1]; + iounmap((void *) this->IO_ADDR_R); + + /* Free the MTD device structure */ + kfree (ppchameleon_mtd); + kfree (ppchameleonevb_mtd); +} +module_exit(ppchameleonevb_cleanup); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("DAVE Srl <support-ppchameleon@dave-tech.it>"); +MODULE_DESCRIPTION("MTD map driver for DAVE Srl PPChameleonEVB board"); |