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[MTD] [NAND] cs553x_nand: command line partitioning support 

Implements kernel command line partitioning support for the CS5535/CS5536 chipsets driver.

For that the following is done:

* cs553x_cleanup(): try the cleanup for all chip selects to not leak memory
* Assign a unique name for each chip select to be separately addressable in the command line mtd-id portion(s)
* Use the already defined PIN_OPT_IDE constant where appropriate for readability
* Include command line partitioning support when CONFIG_MTD_PARTS is set

Signed-off-by: Mart Raudsepp <mart.raudsepp@artecdesign.ee>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Mart Raudsepp 2008-02-09 08:16:36 +00:00 committed by David Woodhouse
parent b1d0e4f535
commit 641f43669f
1 changed files with 28 additions and 3 deletions
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31
drivers/mtd/nand/cs553x_nand.c
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@ -13,9 +13,12 @@
* Overview:
* This is a device driver for the NAND flash controller found on
* the AMD CS5535/CS5536 companion chipsets for the Geode processor.
* mtd-id for command line partitioning is cs553x_nand_cs[0-3]
* where 0-3 reflects the chip select for NAND.
*
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
@ -244,6 +247,8 @@ static int __init cs553x_init_one(int cs, int mmio, unsigned long adr)
goto out_ior;
}
new_mtd->name = kasprintf(GFP_KERNEL, "cs553x_nand_cs%d", cs);
cs553x_mtd[cs] = new_mtd;
goto out;
@ -272,12 +277,21 @@ static int is_geode(void)
return 0;
}
#ifdef CONFIG_MTD_PARTITIONS
const char *part_probes[] = { "cmdlinepart", NULL };
#endif
static int __init cs553x_init(void)
{
int err = -ENXIO;
int i;
uint64_t val;
int mtd_parts_nb = 0;
struct mtd_partition *mtd_parts = NULL;
/* If the CPU isn't a Geode GX or LX, abort */
if (!is_geode())
return -ENXIO;
@ -290,7 +304,7 @@ static int __init cs553x_init(void)
/* If it doesn't have the NAND controller enabled, abort */
rdmsrl(MSR_DIVIL_BALL_OPTS, val);
if (val & 1) {
if (val & PIN_OPT_IDE) {
printk(KERN_INFO "CS553x NAND controller: Flash I/O not enabled in MSR_DIVIL_BALL_OPTS.\n");
return -ENXIO;
}
@ -306,9 +320,19 @@ static int __init cs553x_init(void)
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. */
#ifdef CONFIG_MTD_PARTITIONS
mtd_parts_nb = parse_mtd_partitions(cs553x_mtd[i], part_probes, &mtd_parts, 0);
if (mtd_parts_nb > 0) {
printk(KERN_NOTICE "Using command line partition definition\n");
add_mtd_partitions(cs553x_mtd[i], mtd_parts, mtd_parts_nb);
} else {
add_mtd_device(cs553x_mtd[i]);
}
#else
add_mtd_device(cs553x_mtd[i]);
#endif
err = 0;
}
}
@ -328,13 +352,14 @@ static void __exit cs553x_cleanup(void)
void __iomem *mmio_base;
if (!mtd)
break;
continue;
this = cs553x_mtd[i]->priv;
mmio_base = this->IO_ADDR_R;
/* Release resources, unregister device */
nand_release(cs553x_mtd[i]);
kfree(cs553x_mtd[i]->name);
cs553x_mtd[i] = NULL;
/* unmap physical address */