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linux/drivers/mtd/nand/cs553x_nand.c
David Woodhouse 179fdc3f8d [MTD] Basic NAND driver for AMD/NatSemi CS5535/CS5536 Geode companion chip 
This lacks hardware ECC support and a few optimisations we're going to
want fairly soon, but it works well enough to mount and use JFFS2.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-11 22:35:28 +01:00

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/*
* drivers/mtd/nand/cs553x_nand.c
*
* (C) 2005, 2006 Red Hat Inc.
*
* Author: David Woodhouse <dwmw2@infradead.org>
*
* 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 controller found on
* the AMD CS5535/CS5536 companion chipsets for the Geode processor.
*
*/
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <asm/msr.h>
#include <asm/io.h>
#define NR_CS553X_CONTROLLERS 4
/* NAND Timing MSRs */
#define MSR_NANDF_DATA 0x5140001b /* NAND Flash Data Timing MSR */
#define MSR_NANDF_CTL 0x5140001c /* NAND Flash Control Timing */
#define MSR_NANDF_RSVD 0x5140001d /* Reserved */
/* NAND BAR MSRs */
#define MSR_DIVIL_LBAR_FLSH0 0x51400010 /* Flash Chip Select 0 */
#define MSR_DIVIL_LBAR_FLSH1 0x51400011 /* Flash Chip Select 1 */
#define MSR_DIVIL_LBAR_FLSH2 0x51400012 /* Flash Chip Select 2 */
#define MSR_DIVIL_LBAR_FLSH3 0x51400013 /* Flash Chip Select 3 */
/* Each made up of... */
#define FLSH_LBAR_EN (1ULL<<32)
#define FLSH_NOR_NAND (1ULL<<33) /* 1 for NAND */
#define FLSH_MEM_IO (1ULL<<34) /* 1 for MMIO */
/* I/O BARs have BASE_ADDR in bits 15:4, IO_MASK in 47:36 */
/* MMIO BARs have BASE_ADDR in bits 31:12, MEM_MASK in 63:44 */
/* Pin function selection MSR (IDE vs. flash on the IDE pins) */
#define MSR_DIVIL_BALL_OPTS 0x51400015
#define PIN_OPT_IDE (1<<0) /* 0 for flash, 1 for IDE */
/* Registers within the NAND flash controller BAR -- memory mapped */
#define MM_NAND_DATA 0x00 /* 0 to 0x7ff, in fact */
#define MM_NAND_CTL 0x800 /* Any even address 0x800-0x80e */
#define MM_NAND_IO 0x801 /* Any odd address 0x801-0x80f */
#define MM_NAND_STS 0x810
#define MM_NAND_ECC_LSB 0x811
#define MM_NAND_ECC_MSB 0x812
#define MM_NAND_ECC_COL 0x813
#define MM_NAND_LAC 0x814
#define MM_NAND_ECC_CTL 0x815
/* Registers within the NAND flash controller BAR -- I/O mapped */
#define IO_NAND_DATA 0x00 /* 0 to 3, in fact */
#define IO_NAND_CTL 0x04
#define IO_NAND_IO 0x05
#define IO_NAND_STS 0x06
#define IO_NAND_ECC_CTL 0x08
#define IO_NAND_ECC_LSB 0x09
#define IO_NAND_ECC_MSB 0x0a
#define IO_NAND_ECC_COL 0x0b
#define IO_NAND_LAC 0x0c
#define CS_NAND_CTL_DIST_EN (1<<4) /* Enable NAND Distract interrupt */
#define CS_NAND_CTL_RDY_INT_MASK (1<<3) /* Enable RDY/BUSY# interrupt */
#define CS_NAND_CTL_ALE (1<<2)
#define CS_NAND_CTL_CLE (1<<1)
#define CS_NAND_CTL_CE (1<<0) /* Keep low; 1 to reset */
#define CS_NAND_STS_FLASH_RDY (1<<3)
#define CS_NAND_CTLR_BUSY (1<<2)
#define CS_NAND_CMD_COMP (1<<1)
#define CS_NAND_DIST_ST (1<<0)
#define CS_NAND_ECC_PARITY (1<<2)
#define CS_NAND_ECC_CLRECC (1<<1)
#define CS_NAND_ECC_ENECC (1<<0)
static unsigned char cs553x_read_byte(struct mtd_info *mtd)
{
struct nand_chip *this = mtd->priv;
unsigned char foo = readb(this->IO_ADDR_R);
return foo;
}
static void cs553x_write_byte(struct mtd_info *mtd, u_char byte)
{
struct nand_chip *this = mtd->priv;
int i = 100000;
while (i && readb(this->IO_ADDR_R + MM_NAND_STS) & CS_NAND_CTLR_BUSY) {
udelay(1);
i--;
}
writeb(byte, this->IO_ADDR_W+0x801);
}
static void cs553x_hwcontrol(struct mtd_info *mtd, int cmd)
{
struct nand_chip *this = mtd->priv;
void __iomem *mmio_base = this->IO_ADDR_R;
uint8_t old = readb(mmio_base + MM_NAND_CTL);
switch(cmd) {
case NAND_CTL_SETCLE:
old |= CS_NAND_CTL_CLE;
break;
case NAND_CTL_CLRCLE:
old &= ~CS_NAND_CTL_CLE;
break;
case NAND_CTL_SETALE:
old |= CS_NAND_CTL_ALE;
break;
case NAND_CTL_CLRALE:
old &= ~CS_NAND_CTL_ALE;
break;
case NAND_CTL_SETNCE:
old &= ~CS_NAND_CTL_CE;
break;
case NAND_CTL_CLRNCE:
old |= CS_NAND_CTL_CE;
break;
}
writeb(old, mmio_base + MM_NAND_CTL);
}
static int cs553x_device_ready(struct mtd_info *mtd)
{
struct nand_chip *this = mtd->priv;
void __iomem *mmio_base = this->IO_ADDR_R;
unsigned char foo = readb(mmio_base + MM_NAND_STS);
return (foo & CS_NAND_STS_FLASH_RDY) && !(foo & CS_NAND_CTLR_BUSY);
}
static struct mtd_info *cs553x_mtd[4];
static int __init cs553x_init_one(int cs, int mmio, unsigned long adr)
{
int err = 0;
struct nand_chip *this;
struct mtd_info *new_mtd;
printk(KERN_NOTICE "Probing CS553x NAND controller CS#%d at %sIO 0x%08lx\n", cs, mmio?"MM":"P", adr);
if (!mmio) {
printk(KERN_NOTICE "PIO mode not yet implemented for CS553X NAND controller\n");
return -ENXIO;
}
/* Allocate memory for MTD device structure and private data */
new_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip), GFP_KERNEL);
if (!new_mtd) {
printk(KERN_WARNING "Unable to allocate CS553X NAND MTD device structure.\n");
err = -ENOMEM;
goto out;
}
/* Get pointer to private data */
this = (struct nand_chip *) (&new_mtd[1]);
/* Initialize structures */
memset((char *) new_mtd, 0, sizeof(struct mtd_info));
memset((char *) this, 0, sizeof(struct nand_chip));
/* Link the private data with the MTD structure */
new_mtd->priv = this;
/* map physical address */
this->IO_ADDR_R = this->IO_ADDR_W = ioremap(adr, 4096);
if (!this->IO_ADDR_R) {
printk(KERN_WARNING "ioremap cs553x NAND @0x%08lx failed\n", adr);
err = -EIO;
goto out_mtd;
}
this->hwcontrol = cs553x_hwcontrol;
this->dev_ready = cs553x_device_ready;
this->read_byte = cs553x_read_byte;
this->write_byte = cs553x_write_byte;
/* 20 us command delay time */
this->chip_delay = 20;
this->eccmode = NAND_ECC_SOFT;
/* Enable the following for a flash based bad block table */
// this->options = NAND_USE_FLASH_BBT;
/* Scan to find existance of the device */
if (nand_scan (new_mtd, 1)) {
err = -ENXIO;
goto out_ior;
}
cs553x_mtd[cs] = new_mtd;
goto out;
out_ior:
iounmap((void *)this->IO_ADDR_R);
out_mtd:
kfree (new_mtd);
out:
return err;
}
int __init cs553x_init(void)
{
int err = -ENXIO;
int i;
uint64_t val;
/* Check whether we actually have a CS5535 or CS5536 */
if (!pci_find_device(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, NULL) &&
!pci_find_device(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA, NULL))
return -ENXIO;
rdmsrl(MSR_DIVIL_BALL_OPTS, val);
if (val & 1) {
printk(KERN_INFO "CS553x NAND controller: Flash I/O not enabled in MSR_DIVIL_BALL_OPTS.\n");
return -ENXIO;
}
for (i=0; i<NR_CS553X_CONTROLLERS; i++) {
rdmsrl(MSR_DIVIL_LBAR_FLSH0+i, val);
if ((val & (FLSH_LBAR_EN|FLSH_NOR_NAND)) == (FLSH_LBAR_EN|FLSH_NOR_NAND))
err = cs553x_init_one(i, !!(val & FLSH_MEM_IO), val & 0xFFFFFFFF);
}
/* Register all devices together here. This means we can easily hack it to
do mtdconcat etc. if we want to. */
for (i=0; i<NR_CS553X_CONTROLLERS; i++) {
if (cs553x_mtd[i]) {
add_mtd_device(cs553x_mtd[i]);
/* If any devices registered, return success. Else the last error. */
err = 0;
}
}
return err;
}
module_init(cs553x_init);
static void __exit cs553x_cleanup (void)
{
int i;
for (i=0; i<NR_CS553X_CONTROLLERS; i++) {
struct mtd_info *mtd = cs553x_mtd[i];
struct nand_chip *this;
void __iomem *mmio_base;
if (!mtd)
break;
this = cs553x_mtd[i]->priv;
mmio_base = this->IO_ADDR_R;
/* Release resources, unregister device */
nand_release (cs553x_mtd[i]);
cs553x_mtd[i] = NULL;
/* unmap physical adress */
iounmap(mmio_base);
/* Free the MTD device structure */
kfree (mtd);
}
}
module_exit(cs553x_cleanup);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("NAND controller driver for AMD CS5535/CS5536 companion chip");
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