diff options
author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-11 21:55:47 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-11 21:55:47 -0700 |
commit | e86908614f2c7fec401827e5cefd7a6ea9407f85 (patch) | |
tree | fcb5d9e52422b37bdaf0e647126ebdfc1680f162 /drivers/mtd/maps/physmap_of.c | |
parent | 547307420931344a868275bd7ea7a30f117a15a9 (diff) | |
parent | 9b4b8feb962f4b3e74768b7205f1f8f6cce87238 (diff) |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: (408 commits)
[POWERPC] Add memchr() to the bootwrapper
[POWERPC] Implement logging of unhandled signals
[POWERPC] Add legacy serial support for OPB with flattened device tree
[POWERPC] Use 1TB segments
[POWERPC] XilinxFB: Allow fixed framebuffer base address
[POWERPC] XilinxFB: Add support for custom screen resolution
[POWERPC] XilinxFB: Use pdata to pass around framebuffer parameters
[POWERPC] PCI: Add 64-bit physical address support to setup_indirect_pci
[POWERPC] 4xx: Kilauea defconfig file
[POWERPC] 4xx: Kilauea DTS
[POWERPC] 4xx: Add AMCC Kilauea eval board support to platforms/40x
[POWERPC] 4xx: Add AMCC 405EX support to cputable.c
[POWERPC] Adjust TASK_SIZE on ppc32 systems to 3GB that are capable
[POWERPC] Use PAGE_OFFSET to tell if an address is user/kernel in SW TLB handlers
[POWERPC] 85xx: Enable FP emulation in MPC8560 ADS defconfig
[POWERPC] 85xx: Killed <asm/mpc85xx.h>
[POWERPC] 85xx: Add cpm nodes for 8541/8555 CDS
[POWERPC] 85xx: Convert mpc8560ads to the new CPM binding.
[POWERPC] mpc8272ads: Remove muram from the CPM reg property.
[POWERPC] Make clockevents work on PPC601 processors
...
Fixed up conflict in Documentation/powerpc/booting-without-of.txt manually.
Diffstat (limited to 'drivers/mtd/maps/physmap_of.c')
-rw-r--r-- | drivers/mtd/maps/physmap_of.c | 349 |
1 files changed, 217 insertions, 132 deletions
diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c index bbb42c35b69..cf75a566442 100644 --- a/drivers/mtd/maps/physmap_of.c +++ b/drivers/mtd/maps/physmap_of.c @@ -1,9 +1,12 @@ /* - * Normal mappings of chips in physical memory for OF devices + * Flash mappings described by the OF (or flattened) device tree * * Copyright (C) 2006 MontaVista Software Inc. * Author: Vitaly Wool <vwool@ru.mvista.com> * + * Revised to handle newer style flash binding by: + * Copyright (C) 2007 David Gibson, IBM Corporation. + * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your @@ -12,102 +15,157 @@ #include <linux/module.h> #include <linux/types.h> -#include <linux/kernel.h> #include <linux/init.h> -#include <linux/slab.h> #include <linux/device.h> #include <linux/mtd/mtd.h> #include <linux/mtd/map.h> #include <linux/mtd/partitions.h> -#include <linux/mtd/physmap.h> -#include <asm/io.h> -#include <asm/prom.h> -#include <asm/of_device.h> -#include <asm/of_platform.h> +#include <linux/of.h> +#include <linux/of_platform.h> -struct physmap_flash_info { +struct of_flash { struct mtd_info *mtd; struct map_info map; struct resource *res; #ifdef CONFIG_MTD_PARTITIONS - int nr_parts; struct mtd_partition *parts; #endif }; -static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL }; #ifdef CONFIG_MTD_PARTITIONS -static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL }; -#endif +#define OF_FLASH_PARTS(info) ((info)->parts) -#ifdef CONFIG_MTD_PARTITIONS -static int parse_flash_partitions(struct device_node *node, - struct mtd_partition **parts) +static int parse_obsolete_partitions(struct of_device *dev, + struct of_flash *info, + struct device_node *dp) { - int i, plen, retval = -ENOMEM; - const u32 *part; - const char *name; - - part = of_get_property(node, "partitions", &plen); - if (part == NULL) - goto err; - - retval = plen / (2 * sizeof(u32)); - *parts = kzalloc(retval * sizeof(struct mtd_partition), GFP_KERNEL); - if (*parts == NULL) { - printk(KERN_ERR "Can't allocate the flash partition data!\n"); - goto err; - } + int i, plen, nr_parts; + const struct { + u32 offset, len; + } *part; + const char *names; + + part = of_get_property(dp, "partitions", &plen); + if (!part) + return 0; /* No partitions found */ + + dev_warn(&dev->dev, "Device tree uses obsolete partition map binding\n"); + + nr_parts = plen / sizeof(part[0]); + + info->parts = kzalloc(nr_parts * sizeof(*info->parts), GFP_KERNEL); + if (!info->parts) + return -ENOMEM; - name = of_get_property(node, "partition-names", &plen); + names = of_get_property(dp, "partition-names", &plen); - for (i = 0; i < retval; i++) { - (*parts)[i].offset = *part++; - (*parts)[i].size = *part & ~1; - if (*part++ & 1) /* bit 0 set signifies read only partition */ - (*parts)[i].mask_flags = MTD_WRITEABLE; + for (i = 0; i < nr_parts; i++) { + info->parts[i].offset = part->offset; + info->parts[i].size = part->len & ~1; + if (part->len & 1) /* bit 0 set signifies read only partition */ + info->parts[i].mask_flags = MTD_WRITEABLE; - if (name != NULL && plen > 0) { - int len = strlen(name) + 1; + if (names && (plen > 0)) { + int len = strlen(names) + 1; - (*parts)[i].name = (char *)name; + info->parts[i].name = (char *)names; plen -= len; - name += len; - } else - (*parts)[i].name = "unnamed"; + names += len; + } else { + info->parts[i].name = "unnamed"; + } + + part++; } -err: - return retval; + + return nr_parts; } -#endif -static int of_physmap_remove(struct of_device *dev) +static int __devinit parse_partitions(struct of_flash *info, + struct of_device *dev) +{ + const char *partname; + static const char *part_probe_types[] + = { "cmdlinepart", "RedBoot", NULL }; + struct device_node *dp = dev->node, *pp; + int nr_parts, i; + + /* First look for RedBoot table or partitions on the command + * line, these take precedence over device tree information */ + nr_parts = parse_mtd_partitions(info->mtd, part_probe_types, + &info->parts, 0); + if (nr_parts > 0) { + add_mtd_partitions(info->mtd, info->parts, nr_parts); + return 0; + } + + /* First count the subnodes */ + nr_parts = 0; + for (pp = dp->child; pp; pp = pp->sibling) + nr_parts++; + + if (nr_parts == 0) + return parse_obsolete_partitions(dev, info, dp); + + info->parts = kzalloc(nr_parts * sizeof(*info->parts), + GFP_KERNEL); + if (!info->parts) + return -ENOMEM; + + for (pp = dp->child, i = 0; pp; pp = pp->sibling, i++) { + const u32 *reg; + int len; + + reg = of_get_property(pp, "reg", &len); + if (!reg || (len != 2*sizeof(u32))) { + dev_err(&dev->dev, "Invalid 'reg' on %s\n", + dp->full_name); + kfree(info->parts); + info->parts = NULL; + return -EINVAL; + } + info->parts[i].offset = reg[0]; + info->parts[i].size = reg[1]; + + partname = of_get_property(pp, "label", &len); + if (!partname) + partname = of_get_property(pp, "name", &len); + info->parts[i].name = (char *)partname; + + if (of_get_property(pp, "read-only", &len)) + info->parts[i].mask_flags = MTD_WRITEABLE; + } + + return nr_parts; +} +#else /* MTD_PARTITIONS */ +#define OF_FLASH_PARTS(info) (0) +#define parse_partitions(info, dev) (0) +#endif /* MTD_PARTITIONS */ + +static int of_flash_remove(struct of_device *dev) { - struct physmap_flash_info *info; + struct of_flash *info; info = dev_get_drvdata(&dev->dev); - if (info == NULL) + if (!info) return 0; dev_set_drvdata(&dev->dev, NULL); - if (info->mtd != NULL) { -#ifdef CONFIG_MTD_PARTITIONS - if (info->nr_parts) { + if (info->mtd) { + if (OF_FLASH_PARTS(info)) { del_mtd_partitions(info->mtd); - kfree(info->parts); + kfree(OF_FLASH_PARTS(info)); } else { del_mtd_device(info->mtd); } -#else - del_mtd_device(info->mtd); -#endif map_destroy(info->mtd); } - if (info->map.virt != NULL) + if (info->map.virt) iounmap(info->map.virt); - if (info->res != NULL) { + if (info->res) { release_resource(info->res); kfree(info->res); } @@ -115,48 +173,79 @@ static int of_physmap_remove(struct of_device *dev) return 0; } -static int __devinit of_physmap_probe(struct of_device *dev, const struct of_device_id *match) +/* Helper function to handle probing of the obsolete "direct-mapped" + * compatible binding, which has an extra "probe-type" property + * describing the type of flash probe necessary. */ +static struct mtd_info * __devinit obsolete_probe(struct of_device *dev, + struct map_info *map) { struct device_node *dp = dev->node; - struct resource res; - struct physmap_flash_info *info; - const char **probe_type; const char *of_probe; + struct mtd_info *mtd; + static const char *rom_probe_types[] + = { "cfi_probe", "jedec_probe", "map_rom"}; + int i; + + dev_warn(&dev->dev, "Device tree uses obsolete \"direct-mapped\" " + "flash binding\n"); + + of_probe = of_get_property(dp, "probe-type", NULL); + if (!of_probe) { + for (i = 0; i < ARRAY_SIZE(rom_probe_types); i++) { + mtd = do_map_probe(rom_probe_types[i], map); + if (mtd) + return mtd; + } + return NULL; + } else if (strcmp(of_probe, "CFI") == 0) { + return do_map_probe("cfi_probe", map); + } else if (strcmp(of_probe, "JEDEC") == 0) { + return do_map_probe("jedec_probe", map); + } else { + if (strcmp(of_probe, "ROM") != 0) + dev_warn(&dev->dev, "obsolete_probe: don't know probe " + "type '%s', mapping as rom\n", of_probe); + return do_map_probe("mtd_rom", map); + } +} + +static int __devinit of_flash_probe(struct of_device *dev, + const struct of_device_id *match) +{ + struct device_node *dp = dev->node; + struct resource res; + struct of_flash *info; + const char *probe_type = match->data; const u32 *width; int err; - + err = -ENXIO; if (of_address_to_resource(dp, 0, &res)) { - dev_err(&dev->dev, "Can't get the flash mapping!\n"); - err = -EINVAL; + dev_err(&dev->dev, "Can't get IO address from device tree\n"); goto err_out; } - dev_dbg(&dev->dev, "physmap flash device: %.8llx at %.8llx\n", - (unsigned long long)res.end - res.start + 1, - (unsigned long long)res.start); + dev_dbg(&dev->dev, "of_flash device: %.8llx-%.8llx\n", + (unsigned long long)res.start, (unsigned long long)res.end); - info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL); - if (info == NULL) { - err = -ENOMEM; + err = -ENOMEM; + info = kzalloc(sizeof(*info), GFP_KERNEL); + if (!info) goto err_out; - } memset(info, 0, sizeof(*info)); dev_set_drvdata(&dev->dev, info); + err = -EBUSY; info->res = request_mem_region(res.start, res.end - res.start + 1, - dev->dev.bus_id); - if (info->res == NULL) { - dev_err(&dev->dev, "Could not reserve memory region\n"); - err = -ENOMEM; + dev->dev.bus_id); + if (!info->res) goto err_out; - } + err = -ENXIO; width = of_get_property(dp, "bank-width", NULL); - if (width == NULL) { - dev_err(&dev->dev, "Can't get the flash bank width!\n"); - err = -EINVAL; + if (!width) { + dev_err(&dev->dev, "Can't get bank width from device tree\n"); goto err_out; } @@ -165,91 +254,87 @@ static int __devinit of_physmap_probe(struct of_device *dev, const struct of_dev info->map.size = res.end - res.start + 1; info->map.bankwidth = *width; + err = -ENOMEM; info->map.virt = ioremap(info->map.phys, info->map.size); - if (info->map.virt == NULL) { - dev_err(&dev->dev, "Failed to ioremap flash region\n"); - err = EIO; + if (!info->map.virt) { + dev_err(&dev->dev, "Failed to ioremap() flash region\n"); goto err_out; } simple_map_init(&info->map); - of_probe = of_get_property(dp, "probe-type", NULL); - if (of_probe == NULL) { - probe_type = rom_probe_types; - for (; info->mtd == NULL && *probe_type != NULL; probe_type++) - info->mtd = do_map_probe(*probe_type, &info->map); - } else if (!strcmp(of_probe, "CFI")) - info->mtd = do_map_probe("cfi_probe", &info->map); - else if (!strcmp(of_probe, "JEDEC")) - info->mtd = do_map_probe("jedec_probe", &info->map); - else { - if (strcmp(of_probe, "ROM")) - dev_dbg(&dev->dev, "map_probe: don't know probe type " - "'%s', mapping as rom\n", of_probe); - info->mtd = do_map_probe("mtd_rom", &info->map); - } - if (info->mtd == NULL) { - dev_err(&dev->dev, "map_probe failed\n"); - err = -ENXIO; + if (probe_type) + info->mtd = do_map_probe(probe_type, &info->map); + else + info->mtd = obsolete_probe(dev, &info->map); + + err = -ENXIO; + if (!info->mtd) { + dev_err(&dev->dev, "do_map_probe() failed\n"); goto err_out; } info->mtd->owner = THIS_MODULE; -#ifdef CONFIG_MTD_PARTITIONS - err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0); - if (err > 0) { - add_mtd_partitions(info->mtd, info->parts, err); - } else if ((err = parse_flash_partitions(dp, &info->parts)) > 0) { - dev_info(&dev->dev, "Using OF partition information\n"); - add_mtd_partitions(info->mtd, info->parts, err); - info->nr_parts = err; - } else -#endif + err = parse_partitions(info, dev); + if (err < 0) + goto err_out; + + if (err > 0) + add_mtd_partitions(info->mtd, OF_FLASH_PARTS(info), err); + else + add_mtd_device(info->mtd); - add_mtd_device(info->mtd); return 0; err_out: - of_physmap_remove(dev); + of_flash_remove(dev); return err; - - return 0; - - } -static struct of_device_id of_physmap_match[] = { +static struct of_device_id of_flash_match[] = { + { + .compatible = "cfi-flash", + .data = (void *)"cfi_probe", + }, + { + /* FIXME: JEDEC chips can't be safely and reliably + * probed, although the mtd code gets it right in + * practice most of the time. We should use the + * vendor and device ids specified by the binding to + * bypass the heuristic probe code, but the mtd layer + * provides, at present, no interface for doing so + * :(. */ + .compatible = "jedec-flash", + .data = (void *)"jedec_probe", + }, { .type = "rom", .compatible = "direct-mapped" }, { }, }; +MODULE_DEVICE_TABLE(of, of_flash_match); -MODULE_DEVICE_TABLE(of, of_physmap_match); - - -static struct of_platform_driver of_physmap_flash_driver = { - .name = "physmap-flash", - .match_table = of_physmap_match, - .probe = of_physmap_probe, - .remove = of_physmap_remove, +static struct of_platform_driver of_flash_driver = { + .name = "of-flash", + .match_table = of_flash_match, + .probe = of_flash_probe, + .remove = of_flash_remove, }; -static int __init of_physmap_init(void) +static int __init of_flash_init(void) { - return of_register_platform_driver(&of_physmap_flash_driver); + return of_register_platform_driver(&of_flash_driver); } -static void __exit of_physmap_exit(void) +static void __exit of_flash_exit(void) { - of_unregister_platform_driver(&of_physmap_flash_driver); + of_unregister_platform_driver(&of_flash_driver); } -module_init(of_physmap_init); -module_exit(of_physmap_exit); +module_init(of_flash_init); +module_exit(of_flash_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>"); -MODULE_DESCRIPTION("Configurable MTD map driver for OF"); +MODULE_DESCRIPTION("Device tree based MTD map driver"); |