From patchwork Wed Jan 16 14:36:55 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [v4,1/2] mtd/uclinux: support ROM and allow passing the base address Date: Wed, 16 Jan 2013 04:36:55 -0000 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= X-Patchwork-Id: 212536 Message-Id: <1358347016-507-1-git-send-email-u.kleine-koenig@pengutronix.de> To: linux-mtd@lists.infradead.org Cc: Mike Frysinger , kernel@pengutronix.de, Greg Ungerer This allows to put the filesystem at a defined address in ROM allowing to save more precious RAM. I think it's safe to default to ROM because the intention of using the uclinux map is to use a romfs and so mtd-ram doesn't give you anything that mtd-rom doesn't. Signed-off-by: Uwe Kleine-König Acked-by: Greg Ungerer --- Changes since v3, id:1357835498-23904-1-git-send-email-u.kleine-koenig@pengutronix.de: - drop runtime warning - only probe one of map_rom or map_ram as both should succeed in the same cases Changes since v2, id:1350027693-19528-1-git-send-email-u.kleine-koenig@pengutronix.de: - drop a few "ram"s from printks instead of making them "ram/rom". - fix a typo in the commit log and add rational for the introduced warning. Changes since v1, id:1349709952-4332-1-git-send-email-u.kleine-koenig@pengutronix.de: - don't make uclinux_ram_map static as pointed out by Mike and Greg. --- drivers/mtd/maps/Kconfig | 2 +- drivers/mtd/maps/uclinux.c | 24 +++++++++++++++++++----- 2 files changed, 20 insertions(+), 6 deletions(-) diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig index 62ba82c..3ed17c4 100644 --- a/drivers/mtd/maps/Kconfig +++ b/drivers/mtd/maps/Kconfig @@ -429,7 +429,7 @@ config MTD_GPIO_ADDR config MTD_UCLINUX bool "Generic uClinux RAM/ROM filesystem support" - depends on MTD_RAM=y && (!MMU || COLDFIRE) + depends on (MTD_RAM=y || MTD_ROM=y) && (!MMU || COLDFIRE) help Map driver to support image based filesystems for uClinux. diff --git a/drivers/mtd/maps/uclinux.c b/drivers/mtd/maps/uclinux.c index 299bf88..f56d0aa 100644 --- a/drivers/mtd/maps/uclinux.c +++ b/drivers/mtd/maps/uclinux.c @@ -23,12 +23,20 @@ /****************************************************************************/ +#ifdef CONFIG_MTD_ROM +#define MAP_NAME "rom" +#else +#define MAP_NAME "ram" +#endif + struct map_info uclinux_ram_map = { - .name = "RAM", - .phys = (unsigned long)__bss_stop, + .name = MAP_NAME, .size = 0, }; +static unsigned long physaddr = -1; +module_param(physaddr, ulong, S_IRUGO); + static struct mtd_info *uclinux_ram_mtdinfo; /****************************************************************************/ @@ -60,11 +68,17 @@ static int __init uclinux_mtd_init(void) struct map_info *mapp; mapp = &uclinux_ram_map; + + if (physaddr == -1) + mapp->phys = (resource_size_t)__bss_stop; + else + mapp->phys = physaddr; + if (!mapp->size) mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8)))); mapp->bankwidth = 4; - printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n", + printk("uclinux[mtd]: probe address=0x%x size=0x%x\n", (int) mapp->phys, (int) mapp->size); /* @@ -82,7 +96,7 @@ static int __init uclinux_mtd_init(void) simple_map_init(mapp); - mtd = do_map_probe("map_ram", mapp); + mtd = do_map_probe("map_" MAP_NAME, mapp); if (!mtd) { printk("uclinux[mtd]: failed to find a mapping?\n"); return(-ENXIO); @@ -118,6 +132,6 @@ module_exit(uclinux_mtd_cleanup); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Greg Ungerer "); -MODULE_DESCRIPTION("Generic RAM based MTD for uClinux"); +MODULE_DESCRIPTION("Generic MTD for uClinux"); /****************************************************************************/