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linux/drivers/mtd/nand/ppchameleonevb.c
Amol Lad 25f0c659fe ioremap balanced with iounmap for drivers/mtd subsystem 
ioremap must be balanced by an iounmap and failing to do so can result
in a memory leak.

Tested (compilation only) with:
- allmodconfig
- Modifying drivers/mtd/maps/Kconfig and drivers/mtd/nand/Kconfig to
make sure that the changed file is compiling without warning

Signed-off-by: Amol Lad <amol@verismonetworks.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-09-22 10:24:31 +01:00

440 lines
13 KiB
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/*
* drivers/mtd/nand/ppchameleonevb.c
*
* Copyright (C) 2003 DAVE Srl (info@wawnet.biz)
*
* Derived from drivers/mtd/nand/edb7312.c
*
*
* $Id: ppchameleonevb.c,v 1.7 2005/11/07 11:14:31 gleixner Exp $
*
* 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
#ifdef CONFIG_MTD_PARTITIONS
/*
* 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
extern int parse_cmdline_partitions(struct mtd_info *master, struct mtd_partition **pparts, const char *mtd_id);
#endif
/*
* 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
#ifdef CONFIG_MTD_PARTITIONS
const char *part_probes[] = { "cmdlinepart", NULL };
const char *part_probes_evb[] = { "cmdlinepart", NULL };
#endif
/*
* Main initialization routine
*/
static int __init ppchameleonevb_init(void)
{
struct nand_chip *this;
const char *part_type = 0;
int mtd_parts_nb = 0;
struct mtd_partition *mtd_parts = 0;
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
#ifdef CONFIG_MTD_PARTITIONS
ppchameleon_mtd->name = "ppchameleon-nand";
mtd_parts_nb = parse_mtd_partitions(ppchameleon_mtd, part_probes, &mtd_parts, 0);
if (mtd_parts_nb > 0)
part_type = "command line";
else
mtd_parts_nb = 0;
#endif
if (mtd_parts_nb == 0) {
if (ppchameleon_mtd->size == NAND_SMALL_SIZE)
mtd_parts = partition_info_me;
else
mtd_parts = partition_info_hi;
mtd_parts_nb = NUM_PARTITIONS;
part_type = "static";
}
/* Register the partitions */
printk(KERN_NOTICE "Using %s partition definition\n", part_type);
add_mtd_partitions(ppchameleon_mtd, mtd_parts, mtd_parts_nb);
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;
}
#ifdef CONFIG_MTD_PARTITIONS
ppchameleonevb_mtd->name = NAND_EVB_MTD_NAME;
mtd_parts_nb = parse_mtd_partitions(ppchameleonevb_mtd, part_probes_evb, &mtd_parts, 0);
if (mtd_parts_nb > 0)
part_type = "command line";
else
mtd_parts_nb = 0;
#endif
if (mtd_parts_nb == 0) {
mtd_parts = partition_info_evb;
mtd_parts_nb = NUM_PARTITIONS;
part_type = "static";
}
/* Register the partitions */
printk(KERN_NOTICE "Using %s partition definition\n", part_type);
add_mtd_partitions(ppchameleonevb_mtd, mtd_parts, mtd_parts_nb);
/* 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");
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