From 6f5bbff9a1b7d6864a495763448a363bbfa96324 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Wed, 6 May 2009 01:34:22 -0400 Subject: Convert obvious places to deactivate_locked_super() Signed-off-by: Al Viro --- drivers/mtd/mtdsuper.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/mtdsuper.c b/drivers/mtd/mtdsuper.c index 92285d0..af8b42e 100644 --- a/drivers/mtd/mtdsuper.c +++ b/drivers/mtd/mtdsuper.c @@ -74,8 +74,7 @@ static int get_sb_mtd_aux(struct file_system_type *fs_type, int flags, ret = fill_super(sb, data, flags & MS_SILENT ? 1 : 0); if (ret < 0) { - up_write(&sb->s_umount); - deactivate_super(sb); + deactivate_locked_super(sb); return ret; } -- cgit v1.1 From dbf8c11f821b6ff83302c34f2403b4f7231f50ae Mon Sep 17 00:00:00 2001 From: Peter Korsgaard Date: Mon, 18 May 2009 11:13:54 +0100 Subject: mtd_dataflash: unbreak erase support Commit 5b7f3a50 (fix dataflash 64-bit divisions) unfortunately introduced a typo. Erase addr and len were swapped in the pageaddr calculation, causing the wrong sectors to get erased. Signed-off-by: Peter Korsgaard Acked-by: Artem Bityutskiy Signed-off-by: David Woodhouse Signed-off-by: Linus Torvalds --- drivers/mtd/devices/mtd_dataflash.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c index 62dee54..43976aa 100644 --- a/drivers/mtd/devices/mtd_dataflash.c +++ b/drivers/mtd/devices/mtd_dataflash.c @@ -178,7 +178,7 @@ static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr) /* Calculate flash page address; use block erase (for speed) if * we're at a block boundary and need to erase the whole block. */ - pageaddr = div_u64(instr->len, priv->page_size); + pageaddr = div_u64(instr->addr, priv->page_size); do_block = (pageaddr & 0x7) == 0 && instr->len >= blocksize; pageaddr = pageaddr << priv->page_offset; -- cgit v1.1 From 8541c1180a355c4da283fc6b03a92c0233823c1b Mon Sep 17 00:00:00 2001 From: Vladimir Barinov Date: Thu, 23 Apr 2009 15:47:22 +0400 Subject: mtd: MXC NAND driver fixes (v5) The following patch fixes: - re-initialization of host->col_addr which is used as byte index between the successive READID flash commands. - compile error when CONFIG_PM is enabled - pass on the error code from clk_get() - return -ENOMEM in case of failed ioremap() - pass on the return value of platform_driver_probe() directly - remove excessive printk - let command line partition table parsing with mxc_nand name. The cmd_line parsing is done via name that differs from mxc_nand by default and looks like "NAND 256MiB 1,8V 8-bit" Signed-off-by: Vladimir Barinov Signed-off-by: Lothar Wassmann Acked-by: Sascha Hauer Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse --- drivers/mtd/nand/mxc_nand.c | 43 +++++++++++++++++++++++-------------------- 1 file changed, 23 insertions(+), 20 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c index f3548d0..40c2608 100644 --- a/drivers/mtd/nand/mxc_nand.c +++ b/drivers/mtd/nand/mxc_nand.c @@ -831,6 +831,7 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command, break; case NAND_CMD_READID: + host->col_addr = 0; send_read_id(host); break; @@ -867,6 +868,7 @@ static int __init mxcnd_probe(struct platform_device *pdev) mtd->priv = this; mtd->owner = THIS_MODULE; mtd->dev.parent = &pdev->dev; + mtd->name = "mxc_nand"; /* 50 us command delay time */ this->chip_delay = 5; @@ -882,8 +884,10 @@ static int __init mxcnd_probe(struct platform_device *pdev) this->verify_buf = mxc_nand_verify_buf; host->clk = clk_get(&pdev->dev, "nfc"); - if (IS_ERR(host->clk)) + if (IS_ERR(host->clk)) { + err = PTR_ERR(host->clk); goto eclk; + } clk_enable(host->clk); host->clk_act = 1; @@ -896,7 +900,7 @@ static int __init mxcnd_probe(struct platform_device *pdev) host->regs = ioremap(res->start, res->end - res->start + 1); if (!host->regs) { - err = -EIO; + err = -ENOMEM; goto eres; } @@ -1011,30 +1015,35 @@ static int __devexit mxcnd_remove(struct platform_device *pdev) #ifdef CONFIG_PM static int mxcnd_suspend(struct platform_device *pdev, pm_message_t state) { - struct mtd_info *info = platform_get_drvdata(pdev); + struct mtd_info *mtd = platform_get_drvdata(pdev); + struct nand_chip *nand_chip = mtd->priv; + struct mxc_nand_host *host = nand_chip->priv; int ret = 0; DEBUG(MTD_DEBUG_LEVEL0, "MXC_ND : NAND suspend\n"); - if (info) - ret = info->suspend(info); - - /* Disable the NFC clock */ - clk_disable(nfc_clk); /* FIXME */ + if (mtd) { + ret = mtd->suspend(mtd); + /* Disable the NFC clock */ + clk_disable(host->clk); + } return ret; } static int mxcnd_resume(struct platform_device *pdev) { - struct mtd_info *info = platform_get_drvdata(pdev); + struct mtd_info *mtd = platform_get_drvdata(pdev); + struct nand_chip *nand_chip = mtd->priv; + struct mxc_nand_host *host = nand_chip->priv; int ret = 0; DEBUG(MTD_DEBUG_LEVEL0, "MXC_ND : NAND resume\n"); - /* Enable the NFC clock */ - clk_enable(nfc_clk); /* FIXME */ - if (info) - info->resume(info); + if (mtd) { + /* Enable the NFC clock */ + clk_enable(host->clk); + mtd->resume(mtd); + } return ret; } @@ -1055,13 +1064,7 @@ static struct platform_driver mxcnd_driver = { static int __init mxc_nd_init(void) { - /* Register the device driver structure. */ - pr_info("MXC MTD nand Driver\n"); - if (platform_driver_probe(&mxcnd_driver, mxcnd_probe) != 0) { - printk(KERN_ERR "Driver register failed for mxcnd_driver\n"); - return -ENODEV; - } - return 0; + return platform_driver_probe(&mxcnd_driver, mxcnd_probe); } static void __exit mxc_nd_cleanup(void) -- cgit v1.1 From ec0482e6cfbd460bc69a9073ffbef4c2f3422fdf Mon Sep 17 00:00:00 2001 From: Ben Dooks Date: Sat, 30 May 2009 16:55:29 +0100 Subject: [MTD] [NAND] S3C2410: Move to using platform device table Commit 57fee4a58fe802272742caae248872c392a60670 added an method to specify the platform device compatibility by using an id-table instead of registering multiple drivers. Move the S3C24XX NAND driver to using this ID table. Signed-off-by: Ben Dooks CC: Eric Miao --- drivers/mtd/nand/s3c2410.c | 78 ++++++++++++++++------------------------------ 1 file changed, 26 insertions(+), 52 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index 8e375d5..b7f0740 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -593,7 +593,7 @@ static inline void s3c2410_nand_cpufreq_deregister(struct s3c2410_nand_info *inf /* device management functions */ -static int s3c2410_nand_remove(struct platform_device *pdev) +static int s3c24xx_nand_remove(struct platform_device *pdev) { struct s3c2410_nand_info *info = to_nand_info(pdev); @@ -788,18 +788,17 @@ static void s3c2410_nand_update_chip(struct s3c2410_nand_info *info, } } -/* s3c2410_nand_probe +/* s3c24xx_nand_probe * * called by device layer when it finds a device matching * one our driver can handled. This code checks to see if * it can allocate all necessary resources then calls the * nand layer to look for devices */ - -static int s3c24xx_nand_probe(struct platform_device *pdev, - enum s3c_cpu_type cpu_type) +static int s3c24xx_nand_probe(struct platform_device *pdev) { struct s3c2410_platform_nand *plat = to_nand_plat(pdev); + enum s3c_cpu_type cpu_type; struct s3c2410_nand_info *info; struct s3c2410_nand_mtd *nmtd; struct s3c2410_nand_set *sets; @@ -809,6 +808,8 @@ static int s3c24xx_nand_probe(struct platform_device *pdev, int nr_sets; int setno; + cpu_type = platform_get_device_id(pdev)->driver_data; + pr_debug("s3c2410_nand_probe(%p)\n", pdev); info = kmalloc(sizeof(*info), GFP_KERNEL); @@ -922,7 +923,7 @@ static int s3c24xx_nand_probe(struct platform_device *pdev, return 0; exit_error: - s3c2410_nand_remove(pdev); + s3c24xx_nand_remove(pdev); if (err == 0) err = -EINVAL; @@ -983,50 +984,30 @@ static int s3c24xx_nand_resume(struct platform_device *dev) /* driver device registration */ -static int s3c2410_nand_probe(struct platform_device *dev) -{ - return s3c24xx_nand_probe(dev, TYPE_S3C2410); -} - -static int s3c2440_nand_probe(struct platform_device *dev) -{ - return s3c24xx_nand_probe(dev, TYPE_S3C2440); -} - -static int s3c2412_nand_probe(struct platform_device *dev) -{ - return s3c24xx_nand_probe(dev, TYPE_S3C2412); -} - -static struct platform_driver s3c2410_nand_driver = { - .probe = s3c2410_nand_probe, - .remove = s3c2410_nand_remove, - .suspend = s3c24xx_nand_suspend, - .resume = s3c24xx_nand_resume, - .driver = { - .name = "s3c2410-nand", - .owner = THIS_MODULE, +static struct platform_device_id s3c24xx_driver_ids[] = { + { + .name = "s3c2410-nand", + .driver_data = TYPE_S3C2410, + }, { + .name = "s3c2440-nand", + .driver_data = TYPE_S3C2440, + }, { + .name = "s3c2412-nand", + .driver_data = TYPE_S3C2412, }, + { } }; -static struct platform_driver s3c2440_nand_driver = { - .probe = s3c2440_nand_probe, - .remove = s3c2410_nand_remove, - .suspend = s3c24xx_nand_suspend, - .resume = s3c24xx_nand_resume, - .driver = { - .name = "s3c2440-nand", - .owner = THIS_MODULE, - }, -}; +MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids); -static struct platform_driver s3c2412_nand_driver = { - .probe = s3c2412_nand_probe, - .remove = s3c2410_nand_remove, +static struct platform_driver s3c24xx_nand_driver = { + .probe = s3c24xx_nand_probe, + .remove = s3c24xx_nand_remove, .suspend = s3c24xx_nand_suspend, .resume = s3c24xx_nand_resume, + .id_table = s3c24xx_driver_ids, .driver = { - .name = "s3c2412-nand", + .name = "s3c24xx-nand", .owner = THIS_MODULE, }, }; @@ -1035,16 +1016,12 @@ static int __init s3c2410_nand_init(void) { printk("S3C24XX NAND Driver, (c) 2004 Simtec Electronics\n"); - platform_driver_register(&s3c2412_nand_driver); - platform_driver_register(&s3c2440_nand_driver); - return platform_driver_register(&s3c2410_nand_driver); + return platform_driver_register(&s3c24xx_nand_driver); } static void __exit s3c2410_nand_exit(void) { - platform_driver_unregister(&s3c2412_nand_driver); - platform_driver_unregister(&s3c2440_nand_driver); - platform_driver_unregister(&s3c2410_nand_driver); + platform_driver_unregister(&s3c24xx_nand_driver); } module_init(s3c2410_nand_init); @@ -1053,6 +1030,3 @@ module_exit(s3c2410_nand_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Ben Dooks "); MODULE_DESCRIPTION("S3C24XX MTD NAND driver"); -MODULE_ALIAS("platform:s3c2410-nand"); -MODULE_ALIAS("platform:s3c2412-nand"); -MODULE_ALIAS("platform:s3c2440-nand"); -- cgit v1.1 From 3db72151aa4c246f8bdb8b3501972e1f1b32fe0d Mon Sep 17 00:00:00 2001 From: Ben Dooks Date: Sat, 30 May 2009 17:18:15 +0100 Subject: [MTD] [NAND] S3C2410: Basic kerneldoc comment updates Move to using kerneldoc style commenting in the driver Signed-off-by: Ben Dooks --- drivers/mtd/nand/s3c2410.c | 89 ++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 78 insertions(+), 11 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index b7f0740..a2d1c70 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -74,6 +74,14 @@ static struct nand_ecclayout nand_hw_eccoob = { struct s3c2410_nand_info; +/** + * struct s3c2410_nand_mtd - driver MTD structure + * @mtd: The MTD instance to pass to the MTD layer. + * @chip: The NAND chip information. + * @set: The platform information supplied for this set of NAND chips. + * @info: Link back to the hardware information. + * @scan_res: The result from calling nand_scan_ident(). +*/ struct s3c2410_nand_mtd { struct mtd_info mtd; struct nand_chip chip; @@ -90,6 +98,21 @@ enum s3c_cpu_type { /* overview of the s3c2410 nand state */ +/** + * struct s3c2410_nand_info - NAND controller state. + * @mtds: An array of MTD instances on this controoler. + * @platform: The platform data for this board. + * @device: The platform device we bound to. + * @area: The IO area resource that came from request_mem_region(). + * @clk: The clock resource for this controller. + * @regs: The area mapped for the hardware registers described by @area. + * @sel_reg: Pointer to the register controlling the NAND selection. + * @sel_bit: The bit in @sel_reg to select the NAND chip. + * @mtd_count: The number of MTDs created from this controller. + * @save_sel: The contents of @sel_reg to be saved over suspend. + * @clk_rate: The clock rate from @clk. + * @cpu_type: The exact type of this controller. + */ struct s3c2410_nand_info { /* mtd info */ struct nand_hw_control controller; @@ -145,6 +168,14 @@ static inline int allow_clk_stop(struct s3c2410_nand_info *info) #define NS_IN_KHZ 1000000 +/** + * s3c_nand_calc_rate - calculate timing data. + * @wanted: The cycle time in nanoseconds. + * @clk: The clock rate in kHz. + * @max: The maximum divider value. + * + * Calculate the timing value from the given parameters. + */ static int s3c_nand_calc_rate(int wanted, unsigned long clk, int max) { int result; @@ -169,6 +200,14 @@ static int s3c_nand_calc_rate(int wanted, unsigned long clk, int max) /* controller setup */ +/** + * s3c2410_nand_setrate - setup controller timing information. + * @info: The controller instance. + * + * Given the information supplied by the platform, calculate and set + * the necessary timing registers in the hardware to generate the + * necessary timing cycles to the hardware. + */ static int s3c2410_nand_setrate(struct s3c2410_nand_info *info) { struct s3c2410_platform_nand *plat = info->platform; @@ -245,6 +284,13 @@ static int s3c2410_nand_setrate(struct s3c2410_nand_info *info) return 0; } +/** + * s3c2410_nand_inithw - basic hardware initialisation + * @info: The hardware state. + * + * Do the basic initialisation of the hardware, using s3c2410_nand_setrate() + * to setup the hardware access speeds and set the controller to be enabled. +*/ static int s3c2410_nand_inithw(struct s3c2410_nand_info *info) { int ret; @@ -268,8 +314,19 @@ static int s3c2410_nand_inithw(struct s3c2410_nand_info *info) return 0; } -/* select chip */ - +/** + * s3c2410_nand_select_chip - select the given nand chip + * @mtd: The MTD instance for this chip. + * @chip: The chip number. + * + * This is called by the MTD layer to either select a given chip for the + * @mtd instance, or to indicate that the access has finished and the + * chip can be de-selected. + * + * The routine ensures that the nFCE line is correctly setup, and any + * platform specific selection code is called to route nFCE to the specific + * chip. + */ static void s3c2410_nand_select_chip(struct mtd_info *mtd, int chip) { struct s3c2410_nand_info *info; @@ -667,11 +724,16 @@ static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info, } #endif -/* s3c2410_nand_init_chip +/** + * s3c2410_nand_init_chip - initialise a single instance of an chip + * @info: The base NAND controller the chip is on. + * @nmtd: The new controller MTD instance to fill in. + * @set: The information passed from the board specific platform data. * - * init a single instance of an chip -*/ - + * Initialise the given @nmtd from the information in @info and @set. This + * readies the structure for use with the MTD layer functions by ensuring + * all pointers are setup and the necessary control routines selected. + */ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info, struct s3c2410_nand_mtd *nmtd, struct s3c2410_nand_set *set) @@ -759,12 +821,17 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info, chip->ecc.mode = NAND_ECC_NONE; } -/* s3c2410_nand_update_chip +/** + * s3c2410_nand_update_chip - post probe update + * @info: The controller instance. + * @nmtd: The driver version of the MTD instance. * - * post-probe chip update, to change any items, such as the - * layout for large page nand - */ - + * This routine is called after the chip probe has succesfully completed + * and the relevant per-chip information updated. This call ensure that + * we update the internal state accordingly. + * + * The internal state is currently limited to the ECC state information. +*/ static void s3c2410_nand_update_chip(struct s3c2410_nand_info *info, struct s3c2410_nand_mtd *nmtd) { -- cgit v1.1 From 8c3e843d56f74889f3ff32202e82e3bc16d0d552 Mon Sep 17 00:00:00 2001 From: Andy Green Date: Sun, 10 May 2009 15:41:25 -0500 Subject: [MTD] [NAND] S3C2410: NAND ECC by chip rather than global This makes us take note about the chosen ECC mode per-chip and not the one set globally. Signed-off-by: Andy Green Signed-off-by: Nelson Castillo [ben-linux@fluff.org: andy@openmoko.com => andy@warmcat.com, rewrite subject] Signed-off-by: Ben Dooks --- drivers/mtd/nand/s3c2410.c | 34 +++++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 9 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index a2d1c70..daa4af9 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -819,6 +819,21 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info, if (set->disable_ecc) chip->ecc.mode = NAND_ECC_NONE; + + switch (chip->ecc.mode) { + case NAND_ECC_NONE: + dev_info(info->device, "NAND ECC disabled\n"); + break; + case NAND_ECC_SOFT: + dev_info(info->device, "NAND soft ECC\n"); + break; + case NAND_ECC_HW: + dev_info(info->device, "NAND hardware ECC\n"); + break; + default: + dev_info(info->device, "NAND ECC UNKNOWN\n"); + break; + } } /** @@ -840,18 +855,19 @@ static void s3c2410_nand_update_chip(struct s3c2410_nand_info *info, dev_dbg(info->device, "chip %p => page shift %d\n", chip, chip->page_shift); - if (hardware_ecc) { + if (chip->ecc.mode != NAND_ECC_HW) + return; + /* change the behaviour depending on wether we are using * the large or small page nand device */ - if (chip->page_shift > 10) { - chip->ecc.size = 256; - chip->ecc.bytes = 3; - } else { - chip->ecc.size = 512; - chip->ecc.bytes = 3; - chip->ecc.layout = &nand_hw_eccoob; - } + if (chip->page_shift > 10) { + chip->ecc.size = 256; + chip->ecc.bytes = 3; + } else { + chip->ecc.size = 512; + chip->ecc.bytes = 3; + chip->ecc.layout = &nand_hw_eccoob; } } -- cgit v1.1 From 2612e523dc3695df319662ff279806a3d74de375 Mon Sep 17 00:00:00 2001 From: Nelson Castillo Date: Sun, 10 May 2009 15:41:54 -0500 Subject: [MTD] [NAND] S3C2410: Uninitialised variable cleanup ~ Avoid warning without generating code. (I don't even get the warning without the macro uninitialized_var). Signed-off-by: Nelson Castillo [ben-linux@fluff.org: subject cleanup] Signed-off-by: Ben Dooks --- drivers/mtd/nand/s3c2410.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index daa4af9..7be3663 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -214,7 +214,7 @@ static int s3c2410_nand_setrate(struct s3c2410_nand_info *info) int tacls_max = (info->cpu_type == TYPE_S3C2412) ? 8 : 4; int tacls, twrph0, twrph1; unsigned long clkrate = clk_get_rate(info->clk); - unsigned long set, cfg, mask; + unsigned long uninitialized_var(set), cfg, uninitialized_var(mask); unsigned long flags; /* calculate the timing information for the controller */ @@ -264,9 +264,6 @@ static int s3c2410_nand_setrate(struct s3c2410_nand_info *info) break; default: - /* keep compiler happy */ - mask = 0; - set = 0; BUG(); } -- cgit v1.1 From ae7304e554642d57993b32265b817e6ae80787de Mon Sep 17 00:00:00 2001 From: Andy Green Date: Sun, 10 May 2009 15:42:02 -0500 Subject: [MTD] [NAND] S3C2410: Fix CFG debug order Fix NAND CFG debug order. Signed-off-by: Andy Green Signed-off-by: Nelson Castillo [ben-linux@fluff.org: Change andy@openmoko.com to andy@warmcat.com, subject cleanup] Signed-off-by: Ben Dooks --- drivers/mtd/nand/s3c2410.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index 7be3663..87c40de 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -267,8 +267,6 @@ static int s3c2410_nand_setrate(struct s3c2410_nand_info *info) BUG(); } - dev_dbg(info->device, "NF_CONF is 0x%lx\n", cfg); - local_irq_save(flags); cfg = readl(info->regs + S3C2410_NFCONF); @@ -278,6 +276,8 @@ static int s3c2410_nand_setrate(struct s3c2410_nand_info *info) local_irq_restore(flags); + dev_dbg(info->device, "NF_CONF is 0x%lx\n", cfg); + return 0; } -- cgit v1.1 From ed27f0287062236d50190d7447f6377ff4acdfad Mon Sep 17 00:00:00 2001 From: Andy Green Date: Sun, 10 May 2009 15:42:09 -0500 Subject: [MTD] [NAND] S3C2410: Allow commandline partition processing This patch allows commandline partition processing to work with the s3c2410 NAND platform driver. Signed-off-by: Andy Green Signed-off-by: Nelson Castillo [ben-linux@fluff.org: Change andy@openmoko.com to andy@warmcat.com] Signed-off-by: Ben Dooks --- drivers/mtd/nand/s3c2410.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index 87c40de..ef56652 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -699,17 +699,31 @@ static int s3c24xx_nand_remove(struct platform_device *pdev) } #ifdef CONFIG_MTD_PARTITIONS +const char *part_probes[] = { "cmdlinepart", NULL }; static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info, struct s3c2410_nand_mtd *mtd, struct s3c2410_nand_set *set) { + struct mtd_partition *part_info; + int nr_part = 0; + if (set == NULL) return add_mtd_device(&mtd->mtd); - if (set->nr_partitions > 0 && set->partitions != NULL) { - return add_mtd_partitions(&mtd->mtd, set->partitions, set->nr_partitions); + if (set->nr_partitions == 0) { + mtd->mtd.name = set->name; + nr_part = parse_mtd_partitions(&mtd->mtd, part_probes, + &part_info, 0); + } else { + if (set->nr_partitions > 0 && set->partitions != NULL) { + nr_part = set->nr_partitions; + part_info = set->partitions; + } } + if (nr_part > 0 && part_info) + return add_mtd_partitions(&mtd->mtd, part_info, nr_part); + return add_mtd_device(&mtd->mtd); } #else -- cgit v1.1 From 9db41f9edcb87ae050fcb171c44be7f212728d54 Mon Sep 17 00:00:00 2001 From: Michel Pollet Date: Wed, 13 May 2009 16:54:14 +0100 Subject: [MTD] [NAND] S3C2410: Allow the machine code to get the BBT table from NAND Added a flag to allow the machine code to tell the NAND subsystem that it should try to pickup a BBT from the flash, and also skip the NAND full scan at startup. Signed-off-by: Michel Pollet Signed-off-by: Ben Dooks --- drivers/mtd/nand/s3c2410.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/mtd') diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index ef56652..d315b51 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -845,6 +845,12 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info, dev_info(info->device, "NAND ECC UNKNOWN\n"); break; } + + /* If you use u-boot BBT creation code, specifying this flag will + * let the kernel fish out the BBT from the NAND, and also skip the + * full NAND scan that can take 1/2s or so. Little things... */ + if (set->flash_bbt) + chip->options |= NAND_USE_FLASH_BBT | NAND_SKIP_BBTSCAN; } /** -- cgit v1.1 From dea2aa6fd7d46c43c840ad77905f3c161d5bc59d Mon Sep 17 00:00:00 2001 From: Ben Dooks Date: Sat, 30 May 2009 18:30:18 +0100 Subject: [MTD] [NAND] S3C2410: Deal with unaligned lengths in S3C2440 buffer read/write Add code to deal with fractional lengths, as reported by Werner Almesberger. Re-work of his original patch. Signed-off-by: Ben Dooks --- drivers/mtd/nand/s3c2410.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index d315b51..8a7f960 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -584,7 +584,16 @@ static void s3c2410_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) static void s3c2440_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) { struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); - readsl(info->regs + S3C2440_NFDATA, buf, len / 4); + + readsl(info->regs + S3C2440_NFDATA, buf, len >> 2); + + /* cleanup if we've got less than a word to do */ + if (len & 3) { + buf += len & ~3; + + for (; len & 3; len--) + *buf++ = readb(info->regs + S3C2440_NFDATA); + } } static void s3c2410_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) @@ -596,7 +605,16 @@ static void s3c2410_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int static void s3c2440_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) { struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); - writesl(info->regs + S3C2440_NFDATA, buf, len / 4); + + writesl(info->regs + S3C2440_NFDATA, buf, len >> 2); + + /* cleanup any fractional write */ + if (len & 3) { + buf += len & ~3; + + for (; len & 3; len--, buf++) + writeb(*buf, info->regs + S3C2440_NFDATA); + } } /* cpufreq driver support */ -- cgit v1.1 From 947391cfbaa3b08558844c0b187bcd0223c3f660 Mon Sep 17 00:00:00 2001 From: Ben Dooks Date: Sat, 30 May 2009 18:34:16 +0100 Subject: [MTD] [NAND] S3C2410: Use DIV_ROUND_UP Change to using DIV_ROUND_UP() in the timing calculation instead of blindly doing result++ Signed-off-by: Ben Dooks --- drivers/mtd/nand/s3c2410.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index 8a7f960..89b7905 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -180,8 +180,7 @@ static int s3c_nand_calc_rate(int wanted, unsigned long clk, int max) { int result; - result = (wanted * clk) / NS_IN_KHZ; - result++; + result = DIV_ROUND_UP((wanted * clk), NS_IN_KHZ); pr_debug("result %d from %ld, %d\n", result, clk, wanted); -- cgit v1.1