From e353a20afaee1e3e67fc4fa663a76c68a4c1fb74 Mon Sep 17 00:00:00 2001 From: Lei Wen Date: Thu, 3 Mar 2011 11:08:30 +0800 Subject: [PATCH] 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 Signed-off-by: Haojian Zhuang Signed-off-by: David Woodhouse --- drivers/mtd/nand/pxa3xx_nand.c | 99 +++++++++++++++++++--------------- 1 file changed, 55 insertions(+), 44 deletions(-) diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c index ea2c288df3f6..f44044381360 100644 --- a/drivers/mtd/nand/pxa3xx_nand.c +++ b/drivers/mtd/nand/pxa3xx_nand.c @@ -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); -- 2.30.2