From d9b2b2a277219d4812311d995054ce4f95067725 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Wed, 13 Feb 2008 16:56:49 -0800 Subject: [LIB]: Make PowerPC LMB code generic so sparc64 can use it too. Signed-off-by: David S. Miller --- include/linux/lmb.h | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 include/linux/lmb.h (limited to 'include/linux') diff --git a/include/linux/lmb.h b/include/linux/lmb.h new file mode 100644 index 000000000000..8b93f63407e9 --- /dev/null +++ b/include/linux/lmb.h @@ -0,0 +1,83 @@ +#ifndef _LINUX_LMB_H +#define _LINUX_LMB_H +#ifdef __KERNEL__ + +/* + * Logical memory blocks. + * + * Copyright (C) 2001 Peter Bergner, IBM Corp. + * + * 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 option) any later version. + */ + +#include +#include + +#define MAX_LMB_REGIONS 128 + +struct lmb_property { + unsigned long base; + unsigned long size; +}; + +struct lmb_region { + unsigned long cnt; + unsigned long size; + struct lmb_property region[MAX_LMB_REGIONS+1]; +}; + +struct lmb { + unsigned long debug; + unsigned long rmo_size; + struct lmb_region memory; + struct lmb_region reserved; +}; + +extern struct lmb lmb; + +extern void __init lmb_init(void); +extern void __init lmb_analyze(void); +extern long __init lmb_add(unsigned long base, unsigned long size); +extern long __init lmb_reserve(unsigned long base, unsigned long size); +extern unsigned long __init lmb_alloc(unsigned long size, unsigned long align); +extern unsigned long __init lmb_alloc_base(unsigned long size, + unsigned long align, unsigned long max_addr); +extern unsigned long __init __lmb_alloc_base(unsigned long size, + unsigned long align, unsigned long max_addr); +extern unsigned long __init lmb_phys_mem_size(void); +extern unsigned long __init lmb_end_of_DRAM(void); +extern void __init lmb_enforce_memory_limit(unsigned long memory_limit); +extern int __init lmb_is_reserved(unsigned long addr); + +extern void lmb_dump_all(void); + +static inline unsigned long +lmb_size_bytes(struct lmb_region *type, unsigned long region_nr) +{ + return type->region[region_nr].size; +} +static inline unsigned long +lmb_size_pages(struct lmb_region *type, unsigned long region_nr) +{ + return lmb_size_bytes(type, region_nr) >> PAGE_SHIFT; +} +static inline unsigned long +lmb_start_pfn(struct lmb_region *type, unsigned long region_nr) +{ + return type->region[region_nr].base >> PAGE_SHIFT; +} +static inline unsigned long +lmb_end_pfn(struct lmb_region *type, unsigned long region_nr) +{ + return lmb_start_pfn(type, region_nr) + + lmb_size_pages(type, region_nr); +} + +#include + +#endif /* __KERNEL__ */ + +#endif /* _LINUX_LMB_H */ -- cgit v1.2.3 From e5f270954364a4add74e8445b1db925ac534fcfb Mon Sep 17 00:00:00 2001 From: Becky Bruce Date: Wed, 13 Feb 2008 16:58:39 -0800 Subject: [LMB]: Make lmb support large physical addressing Convert the lmb code to use u64 instead of unsigned long for physical addresses and sizes. This is needed to support large amounts of RAM on 32-bit systems that support 36-bit physical addressing. Signed-off-by: Becky Bruce Signed-off-by: David S. Miller --- include/linux/lmb.h | 38 +++++++++++----------- lib/lmb.c | 93 ++++++++++++++++++++++++++--------------------------- 2 files changed, 65 insertions(+), 66 deletions(-) (limited to 'include/linux') diff --git a/include/linux/lmb.h b/include/linux/lmb.h index 8b93f63407e9..632717c6a2ba 100644 --- a/include/linux/lmb.h +++ b/include/linux/lmb.h @@ -19,19 +19,19 @@ #define MAX_LMB_REGIONS 128 struct lmb_property { - unsigned long base; - unsigned long size; + u64 base; + u64 size; }; struct lmb_region { unsigned long cnt; - unsigned long size; + u64 size; struct lmb_property region[MAX_LMB_REGIONS+1]; }; struct lmb { unsigned long debug; - unsigned long rmo_size; + u64 rmo_size; struct lmb_region memory; struct lmb_region reserved; }; @@ -40,36 +40,36 @@ extern struct lmb lmb; extern void __init lmb_init(void); extern void __init lmb_analyze(void); -extern long __init lmb_add(unsigned long base, unsigned long size); -extern long __init lmb_reserve(unsigned long base, unsigned long size); -extern unsigned long __init lmb_alloc(unsigned long size, unsigned long align); -extern unsigned long __init lmb_alloc_base(unsigned long size, - unsigned long align, unsigned long max_addr); -extern unsigned long __init __lmb_alloc_base(unsigned long size, - unsigned long align, unsigned long max_addr); -extern unsigned long __init lmb_phys_mem_size(void); -extern unsigned long __init lmb_end_of_DRAM(void); -extern void __init lmb_enforce_memory_limit(unsigned long memory_limit); -extern int __init lmb_is_reserved(unsigned long addr); +extern long __init lmb_add(u64 base, u64 size); +extern long __init lmb_reserve(u64 base, u64 size); +extern u64 __init lmb_alloc(u64 size, u64 align); +extern u64 __init lmb_alloc_base(u64 size, + u64, u64 max_addr); +extern u64 __init __lmb_alloc_base(u64 size, + u64 align, u64 max_addr); +extern u64 __init lmb_phys_mem_size(void); +extern u64 __init lmb_end_of_DRAM(void); +extern void __init lmb_enforce_memory_limit(u64 memory_limit); +extern int __init lmb_is_reserved(u64 addr); extern void lmb_dump_all(void); -static inline unsigned long +static inline u64 lmb_size_bytes(struct lmb_region *type, unsigned long region_nr) { return type->region[region_nr].size; } -static inline unsigned long +static inline u64 lmb_size_pages(struct lmb_region *type, unsigned long region_nr) { return lmb_size_bytes(type, region_nr) >> PAGE_SHIFT; } -static inline unsigned long +static inline u64 lmb_start_pfn(struct lmb_region *type, unsigned long region_nr) { return type->region[region_nr].base >> PAGE_SHIFT; } -static inline unsigned long +static inline u64 lmb_end_pfn(struct lmb_region *type, unsigned long region_nr) { return lmb_start_pfn(type, region_nr) + diff --git a/lib/lmb.c b/lib/lmb.c index e34a9e586c42..e3c8dcb04b46 100644 --- a/lib/lmb.c +++ b/lib/lmb.c @@ -34,33 +34,34 @@ void lmb_dump_all(void) DBG("lmb_dump_all:\n"); DBG(" memory.cnt = 0x%lx\n", lmb.memory.cnt); - DBG(" memory.size = 0x%lx\n", lmb.memory.size); + DBG(" memory.size = 0x%llx\n", + (unsigned long long)lmb.memory.size); for (i=0; i < lmb.memory.cnt ;i++) { - DBG(" memory.region[0x%x].base = 0x%lx\n", - i, lmb.memory.region[i].base); - DBG(" .size = 0x%lx\n", - lmb.memory.region[i].size); + DBG(" memory.region[0x%x].base = 0x%llx\n", + i, (unsigned long long)lmb.memory.region[i].base); + DBG(" .size = 0x%llx\n", + (unsigned long long)lmb.memory.region[i].size); } DBG("\n reserved.cnt = 0x%lx\n", lmb.reserved.cnt); DBG(" reserved.size = 0x%lx\n", lmb.reserved.size); for (i=0; i < lmb.reserved.cnt ;i++) { - DBG(" reserved.region[0x%x].base = 0x%lx\n", - i, lmb.reserved.region[i].base); - DBG(" .size = 0x%lx\n", - lmb.reserved.region[i].size); + DBG(" reserved.region[0x%x].base = 0x%llx\n", + i, (unsigned long long)lmb.reserved.region[i].base); + DBG(" .size = 0x%llx\n", + (unsigned long long)lmb.reserved.region[i].size); } #endif /* DEBUG */ } -static unsigned long __init lmb_addrs_overlap(unsigned long base1, - unsigned long size1, unsigned long base2, unsigned long size2) +static unsigned long __init lmb_addrs_overlap(u64 base1, + u64 size1, u64 base2, u64 size2) { return ((base1 < (base2+size2)) && (base2 < (base1+size1))); } -static long __init lmb_addrs_adjacent(unsigned long base1, unsigned long size1, - unsigned long base2, unsigned long size2) +static long __init lmb_addrs_adjacent(u64 base1, u64 size1, + u64 base2, u64 size2) { if (base2 == base1 + size1) return 1; @@ -73,10 +74,10 @@ static long __init lmb_addrs_adjacent(unsigned long base1, unsigned long size1, static long __init lmb_regions_adjacent(struct lmb_region *rgn, unsigned long r1, unsigned long r2) { - unsigned long base1 = rgn->region[r1].base; - unsigned long size1 = rgn->region[r1].size; - unsigned long base2 = rgn->region[r2].base; - unsigned long size2 = rgn->region[r2].size; + u64 base1 = rgn->region[r1].base; + u64 size1 = rgn->region[r1].size; + u64 base2 = rgn->region[r2].base; + u64 size2 = rgn->region[r2].size; return lmb_addrs_adjacent(base1, size1, base2, size2); } @@ -128,8 +129,7 @@ void __init lmb_analyze(void) } /* This routine called with relocation disabled. */ -static long __init lmb_add_region(struct lmb_region *rgn, unsigned long base, - unsigned long size) +static long __init lmb_add_region(struct lmb_region *rgn, u64 base, u64 size) { unsigned long coalesced = 0; long adjacent, i; @@ -142,8 +142,8 @@ static long __init lmb_add_region(struct lmb_region *rgn, unsigned long base, /* First try and coalesce this LMB with another. */ for (i=0; i < rgn->cnt; i++) { - unsigned long rgnbase = rgn->region[i].base; - unsigned long rgnsize = rgn->region[i].size; + u64 rgnbase = rgn->region[i].base; + u64 rgnsize = rgn->region[i].size; if ((rgnbase == base) && (rgnsize == size)) /* Already have this region, so we're done */ @@ -190,7 +190,7 @@ static long __init lmb_add_region(struct lmb_region *rgn, unsigned long base, } /* This routine may be called with relocation disabled. */ -long __init lmb_add(unsigned long base, unsigned long size) +long __init lmb_add(u64 base, u64 size) { struct lmb_region *_rgn = &(lmb.memory); @@ -202,7 +202,7 @@ long __init lmb_add(unsigned long base, unsigned long size) } -long __init lmb_reserve(unsigned long base, unsigned long size) +long __init lmb_reserve(u64 base, u64 size) { struct lmb_region *_rgn = &(lmb.reserved); @@ -211,14 +211,14 @@ long __init lmb_reserve(unsigned long base, unsigned long size) return lmb_add_region(_rgn, base, size); } -long __init lmb_overlaps_region(struct lmb_region *rgn, unsigned long base, - unsigned long size) +long __init lmb_overlaps_region(struct lmb_region *rgn, u64 base, + u64 size) { unsigned long i; for (i=0; i < rgn->cnt; i++) { - unsigned long rgnbase = rgn->region[i].base; - unsigned long rgnsize = rgn->region[i].size; + u64 rgnbase = rgn->region[i].base; + u64 rgnsize = rgn->region[i].size; if ( lmb_addrs_overlap(base,size,rgnbase,rgnsize) ) { break; } @@ -227,40 +227,38 @@ long __init lmb_overlaps_region(struct lmb_region *rgn, unsigned long base, return (i < rgn->cnt) ? i : -1; } -unsigned long __init lmb_alloc(unsigned long size, unsigned long align) +u64 __init lmb_alloc(u64 size, u64 align) { return lmb_alloc_base(size, align, LMB_ALLOC_ANYWHERE); } -unsigned long __init lmb_alloc_base(unsigned long size, unsigned long align, - unsigned long max_addr) +u64 __init lmb_alloc_base(u64 size, u64 align, u64 max_addr) { - unsigned long alloc; + u64 alloc; alloc = __lmb_alloc_base(size, align, max_addr); if (alloc == 0) - panic("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n", - size, max_addr); + panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n", + (unsigned long long) size, (unsigned long long) max_addr); return alloc; } -static unsigned long lmb_align_down(unsigned long addr, unsigned long size) +static u64 lmb_align_down(u64 addr, u64 size) { return addr & ~(size - 1); } -static unsigned long lmb_align_up(unsigned long addr, unsigned long size) +static u64 lmb_align_up(u64 addr, u64 size) { return (addr + (size - 1)) & ~(size - 1); } -unsigned long __init __lmb_alloc_base(unsigned long size, unsigned long align, - unsigned long max_addr) +u64 __init __lmb_alloc_base(u64 size, u64 align, u64 max_addr) { long i, j; - unsigned long base = 0; + u64 base = 0; BUG_ON(0 == size); @@ -269,8 +267,8 @@ unsigned long __init __lmb_alloc_base(unsigned long size, unsigned long align, max_addr = LMB_REAL_LIMIT; for (i = lmb.memory.cnt-1; i >= 0; i--) { - unsigned long lmbbase = lmb.memory.region[i].base; - unsigned long lmbsize = lmb.memory.region[i].size; + u64 lmbbase = lmb.memory.region[i].base; + u64 lmbsize = lmb.memory.region[i].size; if (max_addr == LMB_ALLOC_ANYWHERE) base = lmb_align_down(lmbbase + lmbsize - size, align); @@ -299,12 +297,12 @@ unsigned long __init __lmb_alloc_base(unsigned long size, unsigned long align, } /* You must call lmb_analyze() before this. */ -unsigned long __init lmb_phys_mem_size(void) +u64 __init lmb_phys_mem_size(void) { return lmb.memory.size; } -unsigned long __init lmb_end_of_DRAM(void) +u64 __init lmb_end_of_DRAM(void) { int idx = lmb.memory.cnt - 1; @@ -312,9 +310,10 @@ unsigned long __init lmb_end_of_DRAM(void) } /* You must call lmb_analyze() after this. */ -void __init lmb_enforce_memory_limit(unsigned long memory_limit) +void __init lmb_enforce_memory_limit(u64 memory_limit) { - unsigned long i, limit; + unsigned long i; + u64 limit; struct lmb_property *p; if (! memory_limit) @@ -352,13 +351,13 @@ void __init lmb_enforce_memory_limit(unsigned long memory_limit) } } -int __init lmb_is_reserved(unsigned long addr) +int __init lmb_is_reserved(u64 addr) { int i; for (i = 0; i < lmb.reserved.cnt; i++) { - unsigned long upper = lmb.reserved.region[i].base + - lmb.reserved.region[i].size - 1; + u64 upper = lmb.reserved.region[i].base + + lmb.reserved.region[i].size - 1; if ((addr >= lmb.reserved.region[i].base) && (addr <= upper)) return 1; } -- cgit v1.2.3 From 834d97d452208279edf11c57eca150360d2dd1d6 Mon Sep 17 00:00:00 2001 From: Josh Boyer Date: Thu, 27 Mar 2008 00:33:14 +1100 Subject: [POWERPC] Add of_device_is_available function IEEE 1275 defined a standard "status" property to indicate the operational status of a device. The property has four possible values: okay, disabled, fail, fail-xxx. The absence of this property means the operational status of the device is unknown or okay. This adds a function called of_device_is_available that checks the state of the status property of a device. If the property is absent or set to either "okay" or "ok", it returns 1. Otherwise it returns 0. Signed-off-by: Josh Boyer Signed-off-by: Paul Mackerras --- drivers/of/base.c | 26 ++++++++++++++++++++++++++ include/linux/of.h | 1 + 2 files changed, 27 insertions(+) (limited to 'include/linux') diff --git a/drivers/of/base.c b/drivers/of/base.c index 80c9deca5f35..9bd7c4a31253 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -116,6 +116,32 @@ int of_device_is_compatible(const struct device_node *device, } EXPORT_SYMBOL(of_device_is_compatible); +/** + * of_device_is_available - check if a device is available for use + * + * @device: Node to check for availability + * + * Returns 1 if the status property is absent or set to "okay" or "ok", + * 0 otherwise + */ +int of_device_is_available(const struct device_node *device) +{ + const char *status; + int statlen; + + status = of_get_property(device, "status", &statlen); + if (status == NULL) + return 1; + + if (statlen > 0) { + if (!strcmp(status, "okay") || !strcmp(status, "ok")) + return 1; + } + + return 0; +} +EXPORT_SYMBOL(of_device_is_available); + /** * of_get_parent - Get a node's parent if any * @node: Node to get parent diff --git a/include/linux/of.h b/include/linux/of.h index 6981016dcc25..59a61bdc98b6 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -62,6 +62,7 @@ extern struct property *of_find_property(const struct device_node *np, int *lenp); extern int of_device_is_compatible(const struct device_node *device, const char *); +extern int of_device_is_available(const struct device_node *device); extern const void *of_get_property(const struct device_node *node, const char *name, int *lenp); -- cgit v1.2.3 From c50f68c8aea421267ba7995b1c485c281b28add6 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Mon, 24 Mar 2008 20:50:48 +1100 Subject: [LMB] Add lmb_alloc_nid() A variant of lmb_alloc() that tries to allocate memory on a specified NUMA node 'nid' but falls back to normal lmb_alloc() if that fails. The caller provides a 'nid_range' function pointer which assists the allocator. It is given args 'start', 'end', and pointer to integer 'this_nid'. It places at 'this_nid' the NUMA node id that corresponds to 'start', and returns the end address within 'start' to 'end' at which memory assosciated with 'nid' ends. This callback allows a platform to use lmb_alloc_nid() in just about any context, even ones in which early_pfn_to_nid() might not be working yet. This function will be used by the NUMA setup code on sparc64, and also it can be used by powerpc, replacing it's hand crafted "careful_allocation()" function in arch/powerpc/mm/numa.c If x86 ever converts it's NUMA support over to using the LMB helpers, it can use this too as it has something entirely similar. Signed-off-by: David S. Miller Signed-off-by: Paul Mackerras --- include/linux/lmb.h | 2 ++ lib/lmb.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++------- 2 files changed, 78 insertions(+), 10 deletions(-) (limited to 'include/linux') diff --git a/include/linux/lmb.h b/include/linux/lmb.h index 632717c6a2ba..271153d27fba 100644 --- a/include/linux/lmb.h +++ b/include/linux/lmb.h @@ -42,6 +42,8 @@ extern void __init lmb_init(void); extern void __init lmb_analyze(void); extern long __init lmb_add(u64 base, u64 size); extern long __init lmb_reserve(u64 base, u64 size); +extern u64 __init lmb_alloc_nid(u64 size, u64 align, int nid, + u64 (*nid_range)(u64, u64, int *)); extern u64 __init lmb_alloc(u64 size, u64 align); extern u64 __init lmb_alloc_base(u64 size, u64, u64 max_addr); diff --git a/lib/lmb.c b/lib/lmb.c index 3c43b95fef4a..549fbb3d70cf 100644 --- a/lib/lmb.c +++ b/lib/lmb.c @@ -232,6 +232,82 @@ long __init lmb_overlaps_region(struct lmb_region *rgn, u64 base, return (i < rgn->cnt) ? i : -1; } +static u64 lmb_align_down(u64 addr, u64 size) +{ + return addr & ~(size - 1); +} + +static u64 lmb_align_up(u64 addr, u64 size) +{ + return (addr + (size - 1)) & ~(size - 1); +} + +static u64 __init lmb_alloc_nid_unreserved(u64 start, u64 end, + u64 size, u64 align) +{ + u64 base; + long j; + + base = lmb_align_down((end - size), align); + while (start <= base && + ((j = lmb_overlaps_region(&lmb.reserved, base, size)) >= 0)) + base = lmb_align_down(lmb.reserved.region[j].base - size, + align); + + if (base != 0 && start <= base) { + if (lmb_add_region(&lmb.reserved, base, + lmb_align_up(size, align)) < 0) + base = ~(u64)0; + return base; + } + + return ~(u64)0; +} + +static u64 __init lmb_alloc_nid_region(struct lmb_property *mp, + u64 (*nid_range)(u64, u64, int *), + u64 size, u64 align, int nid) +{ + u64 start, end; + + start = mp->base; + end = start + mp->size; + + start = lmb_align_up(start, align); + while (start < end) { + u64 this_end; + int this_nid; + + this_end = nid_range(start, end, &this_nid); + if (this_nid == nid) { + u64 ret = lmb_alloc_nid_unreserved(start, this_end, + size, align); + if (ret != ~(u64)0) + return ret; + } + start = this_end; + } + + return ~(u64)0; +} + +u64 __init lmb_alloc_nid(u64 size, u64 align, int nid, + u64 (*nid_range)(u64 start, u64 end, int *nid)) +{ + struct lmb_region *mem = &lmb.memory; + int i; + + for (i = 0; i < mem->cnt; i++) { + u64 ret = lmb_alloc_nid_region(&mem->region[i], + nid_range, + size, align, nid); + if (ret != ~(u64)0) + return ret; + } + + return lmb_alloc(size, align); +} + u64 __init lmb_alloc(u64 size, u64 align) { return lmb_alloc_base(size, align, LMB_ALLOC_ANYWHERE); @@ -250,16 +326,6 @@ u64 __init lmb_alloc_base(u64 size, u64 align, u64 max_addr) return alloc; } -static u64 lmb_align_down(u64 addr, u64 size) -{ - return addr & ~(size - 1); -} - -static u64 lmb_align_up(u64 addr, u64 size) -{ - return (addr + (size - 1)) & ~(size - 1); -} - u64 __init __lmb_alloc_base(u64 size, u64 align, u64 max_addr) { long i, j; -- cgit v1.2.3 From 863fbf4966a7ac301a4077e4a04d73e8abfdd7b2 Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Fri, 11 Apr 2008 23:06:45 +1000 Subject: [POWERPC] OF helpers for the GPIO API This implements various helpers to support OF bindings for the GPIO LIB API. Previously this was PowerPC specific, but it seems this code isn't arch-dependent anyhow, so let's place it into of/. SPARC will not see this addition yet, real hardware seem to not use GPIOs at all. But this might change: http://www.leox.org/docs/faq_MLleon.html "16-bit I/O port" sounds promising. :-) Signed-off-by: Anton Vorontsov Acked-by: Grant Likely Signed-off-by: Paul Mackerras --- drivers/of/Kconfig | 6 ++ drivers/of/Makefile | 1 + drivers/of/gpio.c | 242 ++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/of_gpio.h | 69 ++++++++++++++ 4 files changed, 318 insertions(+) create mode 100644 drivers/of/gpio.c create mode 100644 include/linux/of_gpio.h (limited to 'include/linux') diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index c03072b12f42..3354ad766a49 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -1,3 +1,9 @@ config OF_DEVICE def_bool y depends on OF && (SPARC || PPC_OF) + +config OF_GPIO + def_bool y + depends on OF && PPC_OF && HAVE_GPIO_LIB + help + OpenFirmware GPIO accessors diff --git a/drivers/of/Makefile b/drivers/of/Makefile index ab9be5d5255b..5a61f70b4027 100644 --- a/drivers/of/Makefile +++ b/drivers/of/Makefile @@ -1,2 +1,3 @@ obj-y = base.o obj-$(CONFIG_OF_DEVICE) += device.o platform.o +obj-$(CONFIG_OF_GPIO) += gpio.o diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c new file mode 100644 index 000000000000..000681e98f2c --- /dev/null +++ b/drivers/of/gpio.c @@ -0,0 +1,242 @@ +/* + * OF helpers for the GPIO API + * + * Copyright (c) 2007-2008 MontaVista Software, Inc. + * + * Author: Anton Vorontsov + * + * 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 option) any later version. + */ + +#include +#include +#include +#include +#include +#include + +/** + * of_get_gpio - Get a GPIO number from the device tree to use with GPIO API + * @np: device node to get GPIO from + * @index: index of the GPIO + * + * Returns GPIO number to use with Linux generic GPIO API, or one of the errno + * value on the error condition. + */ +int of_get_gpio(struct device_node *np, int index) +{ + int ret = -EINVAL; + struct device_node *gc; + struct of_gpio_chip *of_gc = NULL; + int size; + const u32 *gpios; + u32 nr_cells; + int i; + const void *gpio_spec; + const u32 *gpio_cells; + int gpio_index = 0; + + gpios = of_get_property(np, "gpios", &size); + if (!gpios) { + ret = -ENOENT; + goto err0; + } + nr_cells = size / sizeof(u32); + + for (i = 0; i < nr_cells; gpio_index++) { + const phandle *gpio_phandle; + + gpio_phandle = gpios + i; + gpio_spec = gpio_phandle + 1; + + /* one cell hole in the gpios = <>; */ + if (!*gpio_phandle) { + if (gpio_index == index) + return -ENOENT; + i++; + continue; + } + + gc = of_find_node_by_phandle(*gpio_phandle); + if (!gc) { + pr_debug("%s: could not find phandle for gpios\n", + np->full_name); + goto err0; + } + + of_gc = gc->data; + if (!of_gc) { + pr_debug("%s: gpio controller %s isn't registered\n", + np->full_name, gc->full_name); + goto err1; + } + + gpio_cells = of_get_property(gc, "#gpio-cells", &size); + if (!gpio_cells || size != sizeof(*gpio_cells) || + *gpio_cells != of_gc->gpio_cells) { + pr_debug("%s: wrong #gpio-cells for %s\n", + np->full_name, gc->full_name); + goto err1; + } + + /* Next phandle is at phandle cells + #gpio-cells */ + i += sizeof(*gpio_phandle) / sizeof(u32) + *gpio_cells; + if (i >= nr_cells + 1) { + pr_debug("%s: insufficient gpio-spec length\n", + np->full_name); + goto err1; + } + + if (gpio_index == index) + break; + + of_gc = NULL; + of_node_put(gc); + } + + if (!of_gc) { + ret = -ENOENT; + goto err0; + } + + ret = of_gc->xlate(of_gc, np, gpio_spec); + if (ret < 0) + goto err1; + + ret += of_gc->gc.base; +err1: + of_node_put(gc); +err0: + pr_debug("%s exited with status %d\n", __func__, ret); + return ret; +} +EXPORT_SYMBOL(of_get_gpio); + +/** + * of_gpio_simple_xlate - translate gpio_spec to the GPIO number + * @of_gc: pointer to the of_gpio_chip structure + * @np: device node of the GPIO chip + * @gpio_spec: gpio specifier as found in the device tree + * + * This is simple translation function, suitable for the most 1:1 mapped + * gpio chips. This function performs only one sanity check: whether gpio + * is less than ngpios (that is specified in the gpio_chip). + */ +int of_gpio_simple_xlate(struct of_gpio_chip *of_gc, struct device_node *np, + const void *gpio_spec) +{ + const u32 *gpio = gpio_spec; + + if (*gpio > of_gc->gc.ngpio) + return -EINVAL; + + return *gpio; +} +EXPORT_SYMBOL(of_gpio_simple_xlate); + +/* Should be sufficient for now, later we'll use dynamic bases. */ +#if defined(CONFIG_PPC32) || defined(CONFIG_SPARC32) +#define GPIOS_PER_CHIP 32 +#else +#define GPIOS_PER_CHIP 64 +#endif + +static int of_get_gpiochip_base(struct device_node *np) +{ + struct device_node *gc = NULL; + int gpiochip_base = 0; + + while ((gc = of_find_all_nodes(gc))) { + if (!of_get_property(gc, "gpio-controller", NULL)) + continue; + + if (gc != np) { + gpiochip_base += GPIOS_PER_CHIP; + continue; + } + + of_node_put(gc); + + if (gpiochip_base >= ARCH_NR_GPIOS) + return -ENOSPC; + + return gpiochip_base; + } + + return -ENOENT; +} + +/** + * of_mm_gpiochip_add - Add memory mapped GPIO chip (bank) + * @np: device node of the GPIO chip + * @mm_gc: pointer to the of_mm_gpio_chip allocated structure + * + * To use this function you should allocate and fill mm_gc with: + * + * 1) In the gpio_chip structure: + * - all the callbacks + * + * 2) In the of_gpio_chip structure: + * - gpio_cells + * - xlate callback (optional) + * + * 3) In the of_mm_gpio_chip structure: + * - save_regs callback (optional) + * + * If succeeded, this function will map bank's memory and will + * do all necessary work for you. Then you'll able to use .regs + * to manage GPIOs from the callbacks. + */ +int of_mm_gpiochip_add(struct device_node *np, + struct of_mm_gpio_chip *mm_gc) +{ + int ret = -ENOMEM; + struct of_gpio_chip *of_gc = &mm_gc->of_gc; + struct gpio_chip *gc = &of_gc->gc; + + gc->label = kstrdup(np->full_name, GFP_KERNEL); + if (!gc->label) + goto err0; + + mm_gc->regs = of_iomap(np, 0); + if (!mm_gc->regs) + goto err1; + + gc->base = of_get_gpiochip_base(np); + if (gc->base < 0) { + ret = gc->base; + goto err1; + } + + if (!of_gc->xlate) + of_gc->xlate = of_gpio_simple_xlate; + + if (mm_gc->save_regs) + mm_gc->save_regs(mm_gc); + + np->data = of_gc; + + ret = gpiochip_add(gc); + if (ret) + goto err2; + + /* We don't want to lose the node and its ->data */ + of_node_get(np); + + pr_debug("%s: registered as generic GPIO chip, base is %d\n", + np->full_name, gc->base); + return 0; +err2: + np->data = NULL; + iounmap(mm_gc->regs); +err1: + kfree(gc->label); +err0: + pr_err("%s: GPIO chip registration failed with status %d\n", + np->full_name, ret); + return ret; +} +EXPORT_SYMBOL(of_mm_gpiochip_add); diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h new file mode 100644 index 000000000000..2ee97e9877a7 --- /dev/null +++ b/include/linux/of_gpio.h @@ -0,0 +1,69 @@ +/* + * OF helpers for the GPIO API + * + * Copyright (c) 2007-2008 MontaVista Software, Inc. + * + * Author: Anton Vorontsov + * + * 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 option) any later version. + */ + +#ifndef __LINUX_OF_GPIO_H +#define __LINUX_OF_GPIO_H + +#include +#include + +#ifdef CONFIG_OF_GPIO + +/* + * Generic OF GPIO chip + */ +struct of_gpio_chip { + struct gpio_chip gc; + int gpio_cells; + int (*xlate)(struct of_gpio_chip *of_gc, struct device_node *np, + const void *gpio_spec); +}; + +static inline struct of_gpio_chip *to_of_gpio_chip(struct gpio_chip *gc) +{ + return container_of(gc, struct of_gpio_chip, gc); +} + +/* + * OF GPIO chip for memory mapped banks + */ +struct of_mm_gpio_chip { + struct of_gpio_chip of_gc; + void (*save_regs)(struct of_mm_gpio_chip *mm_gc); + void __iomem *regs; +}; + +static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc) +{ + struct of_gpio_chip *of_gc = to_of_gpio_chip(gc); + + return container_of(of_gc, struct of_mm_gpio_chip, of_gc); +} + +extern int of_get_gpio(struct device_node *np, int index); +extern int of_mm_gpiochip_add(struct device_node *np, + struct of_mm_gpio_chip *mm_gc); +extern int of_gpio_simple_xlate(struct of_gpio_chip *of_gc, + struct device_node *np, + const void *gpio_spec); +#else + +/* Drivers may not strictly depend on the GPIO support, so let them link. */ +static inline int of_get_gpio(struct device_node *np, int index) +{ + return -ENOSYS; +} + +#endif /* CONFIG_OF_GPIO */ + +#endif /* __LINUX_OF_GPIO_H */ -- cgit v1.2.3 From 612212a3f2f053ea68ce9cd16d3deeca7754e8c9 Mon Sep 17 00:00:00 2001 From: Jochen Friedrich Date: Sat, 12 Apr 2008 05:22:35 +1000 Subject: [POWERPC] i2c: OF helpers for the i2c API This implements various helpers to support OF bindings for the i2c API. Signed-off-by: Jochen Friedrich Acked-by: David S. Miller Acked-by: Stephen Rothwell Signed-off-by: Paul Mackerras --- drivers/of/Kconfig | 6 +++ drivers/of/Makefile | 1 + drivers/of/i2c.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/of_i2c.h | 24 +++++++++++ 4 files changed, 146 insertions(+) create mode 100644 drivers/of/i2c.c create mode 100644 include/linux/of_i2c.h (limited to 'include/linux') diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index 3354ad766a49..7c305317f372 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -7,3 +7,9 @@ config OF_GPIO depends on OF && PPC_OF && HAVE_GPIO_LIB help OpenFirmware GPIO accessors + +config OF_I2C + def_bool y + depends on OF && I2C + help + OpenFirmware I2C accessors diff --git a/drivers/of/Makefile b/drivers/of/Makefile index 5a61f70b4027..a07b95362c53 100644 --- a/drivers/of/Makefile +++ b/drivers/of/Makefile @@ -1,3 +1,4 @@ obj-y = base.o obj-$(CONFIG_OF_DEVICE) += device.o platform.o obj-$(CONFIG_OF_GPIO) += gpio.o +obj-$(CONFIG_OF_I2C) += i2c.o diff --git a/drivers/of/i2c.c b/drivers/of/i2c.c new file mode 100644 index 000000000000..631689171159 --- /dev/null +++ b/drivers/of/i2c.c @@ -0,0 +1,115 @@ +/* + * OF helpers for the I2C API + * + * Copyright (c) 2008 Jochen Friedrich + * + * Based on a previous patch from Jon Smirl + * + * 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 option) any later version. + */ + +#include +#include + +struct i2c_driver_device { + char *of_device; + char *i2c_type; +}; + +static struct i2c_driver_device i2c_devices[] = { + { "dallas,ds1374", "rtc-ds1374" }, +}; + +static int of_find_i2c_driver(struct device_node *node, + struct i2c_board_info *info) +{ + int i, cplen; + const char *compatible; + const char *p; + + /* 1. search for exception list entry */ + for (i = 0; i < ARRAY_SIZE(i2c_devices); i++) { + if (!of_device_is_compatible(node, i2c_devices[i].of_device)) + continue; + if (strlcpy(info->type, i2c_devices[i].i2c_type, + I2C_NAME_SIZE) >= I2C_NAME_SIZE) + return -ENOMEM; + + return 0; + } + + compatible = of_get_property(node, "compatible", &cplen); + if (!compatible) + return -ENODEV; + + /* 2. search for linux, entry */ + p = compatible; + while (cplen > 0) { + if (!strncmp(p, "linux,", 6)) { + p += 6; + if (strlcpy(info->type, p, + I2C_NAME_SIZE) >= I2C_NAME_SIZE) + return -ENOMEM; + return 0; + } + + i = strlen(p) + 1; + p += i; + cplen -= i; + } + + /* 3. take fist compatible entry and strip manufacturer */ + p = strchr(compatible, ','); + if (!p) + return -ENODEV; + p++; + if (strlcpy(info->type, p, I2C_NAME_SIZE) >= I2C_NAME_SIZE) + return -ENOMEM; + return 0; +} + +void of_register_i2c_devices(struct i2c_adapter *adap, + struct device_node *adap_node) +{ + void *result; + struct device_node *node; + + for_each_child_of_node(adap_node, node) { + struct i2c_board_info info = {}; + const u32 *addr; + int len; + + addr = of_get_property(node, "reg", &len); + if (!addr || len < sizeof(int) || *addr > (1 << 10) - 1) { + printk(KERN_ERR + "of-i2c: invalid i2c device entry\n"); + continue; + } + + info.irq = irq_of_parse_and_map(node, 0); + if (info.irq == NO_IRQ) + info.irq = -1; + + if (of_find_i2c_driver(node, &info) < 0) { + irq_dispose_mapping(info.irq); + continue; + } + + info.addr = *addr; + + request_module(info.type); + + result = i2c_new_device(adap, &info); + if (result == NULL) { + printk(KERN_ERR + "of-i2c: Failed to load driver for %s\n", + info.type); + irq_dispose_mapping(info.irq); + continue; + } + } +} +EXPORT_SYMBOL(of_register_i2c_devices); diff --git a/include/linux/of_i2c.h b/include/linux/of_i2c.h new file mode 100644 index 000000000000..2e5a96732042 --- /dev/null +++ b/include/linux/of_i2c.h @@ -0,0 +1,24 @@ +/* + * Generic I2C API implementation for PowerPC. + * + * Copyright (c) 2008 Jochen Friedrich + * + * 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 option) any later version. + */ + +#ifndef __LINUX_OF_I2C_H +#define __LINUX_OF_I2C_H + +#include + +#ifdef CONFIG_OF_I2C + +void of_register_i2c_devices(struct i2c_adapter *adap, + struct device_node *adap_node); + +#endif /* CONFIG_OF_I2C */ + +#endif /* __LINUX_OF_I2C_H */ -- cgit v1.2.3