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mtd: pxa3xx_nand: make scan procedure more clear 

The previous probe function is some kind of big part.
This patch seperate the resource allocation to keep the probe process
more clear than before.

Signed-off-by: Lei Wen <leiwen@marvell.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Lei Wen 2011-03-03 11:08:30 +08:00 committed by David Woodhouse
parent e70727e442
commit e353a20afa
1 changed files with 55 additions and 44 deletions
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99
drivers/mtd/nand/pxa3xx_nand.c
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@ -126,6 +126,7 @@ struct pxa3xx_nand_info {
unsigned int buf_start;
unsigned int buf_count;
struct mtd_info *mtd;
/* DMA information */
int drcmr_dat;
int drcmr_cmd;
@ -1044,34 +1045,27 @@ static void pxa3xx_nand_init_mtd(struct mtd_info *mtd,
this->chip_delay = 25;
}
static int pxa3xx_nand_probe(struct platform_device *pdev)
static
struct pxa3xx_nand_info *alloc_nand_resource(struct platform_device *pdev)
{
struct pxa3xx_nand_platform_data *pdata;
struct pxa3xx_nand_platform_data *pdata = pdev->dev.platform_data;
struct pxa3xx_nand_info *info;
struct nand_chip *this;
struct mtd_info *mtd;
struct resource *r;
int ret = 0, irq;
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "no platform data defined\n");
return -ENODEV;
}
int ret, irq;
mtd = kzalloc(sizeof(struct mtd_info) + sizeof(struct pxa3xx_nand_info),
GFP_KERNEL);
if (!mtd) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
return NULL;
}
info = (struct pxa3xx_nand_info *)(&mtd[1]);
info->pdev = pdev;
this = &info->nand_chip;
mtd->priv = info;
info->mtd = mtd;
mtd->owner = THIS_MODULE;
info->clk = clk_get(&pdev->dev, NULL);
@ -1149,31 +1143,9 @@ static int pxa3xx_nand_probe(struct platform_device *pdev)
}
pxa3xx_nand_init_mtd(mtd, info);
platform_set_drvdata(pdev, info);
platform_set_drvdata(pdev, mtd);
if (nand_scan(mtd, 1)) {
dev_err(&pdev->dev, "failed to scan nand\n");
ret = -ENXIO;
goto fail_free_irq;
}
#ifdef CONFIG_MTD_PARTITIONS
if (mtd_has_cmdlinepart()) {
static const char *probes[] = { "cmdlinepart", NULL };
struct mtd_partition *parts;
int nr_parts;
nr_parts = parse_mtd_partitions(mtd, probes, &parts, 0);
if (nr_parts)
return add_mtd_partitions(mtd, parts, nr_parts);
}
return add_mtd_partitions(mtd, pdata->parts, pdata->nr_parts);
#else
return 0;
#endif
return info;
fail_free_irq:
free_irq(irq, info);
@ -1193,13 +1165,13 @@ fail_put_clk:
clk_put(info->clk);
fail_free_mtd:
kfree(mtd);
return ret;
return NULL;
}
static int pxa3xx_nand_remove(struct platform_device *pdev)
{
struct mtd_info *mtd = platform_get_drvdata(pdev);
struct pxa3xx_nand_info *info = mtd->priv;
struct pxa3xx_nand_info *info = platform_get_drvdata(pdev);
struct mtd_info *mtd = info->mtd;
struct resource *r;
int irq;
@ -1230,11 +1202,50 @@ static int pxa3xx_nand_remove(struct platform_device *pdev)
return 0;
}
static int pxa3xx_nand_probe(struct platform_device *pdev)
{
struct pxa3xx_nand_platform_data *pdata;
struct pxa3xx_nand_info *info;
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "no platform data defined\n");
return -ENODEV;
}
info = alloc_nand_resource(pdev);
if (info == NULL)
return -ENOMEM;
if (nand_scan(info->mtd, 1)) {
dev_err(&pdev->dev, "failed to scan nand\n");
pxa3xx_nand_remove(pdev);
return -ENODEV;
}
#ifdef CONFIG_MTD_PARTITIONS
if (mtd_has_cmdlinepart()) {
const char *probes[] = { "cmdlinepart", NULL };
struct mtd_partition *parts;
int nr_parts;
nr_parts = parse_mtd_partitions(info->mtd, probes, &parts, 0);
if (nr_parts)
return add_mtd_partitions(mtd, parts, nr_parts);
}
return add_mtd_partitions(mtd, pdata->parts, pdata->nr_parts);
#else
return 0;
#endif
}
#ifdef CONFIG_PM
static int pxa3xx_nand_suspend(struct platform_device *pdev, pm_message_t state)
{
struct mtd_info *mtd = (struct mtd_info *)platform_get_drvdata(pdev);
struct pxa3xx_nand_info *info = mtd->priv;
struct pxa3xx_nand_info *info = platform_get_drvdata(pdev);
struct mtd_info *mtd = info->mtd;
if (info->state != STATE_READY) {
dev_err(&pdev->dev, "driver busy, state = %d\n", info->state);
@ -1246,8 +1257,8 @@ static int pxa3xx_nand_suspend(struct platform_device *pdev, pm_message_t state)
static int pxa3xx_nand_resume(struct platform_device *pdev)
{
struct mtd_info *mtd = (struct mtd_info *)platform_get_drvdata(pdev);
struct pxa3xx_nand_info *info = mtd->priv;
struct pxa3xx_nand_info *info = platform_get_drvdata(pdev);
struct mtd_info *mtd = info->mtd;
nand_writel(info, NDTR0CS0, info->ndtr0cs0);
nand_writel(info, NDTR1CS0, info->ndtr1cs0);