From patchwork Tue Nov 10 21:35:50 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matt Fleming X-Patchwork-Id: 59154 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id nAALZt97020063 for ; Tue, 10 Nov 2009 21:35:55 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755001AbZKJVft (ORCPT ); Tue, 10 Nov 2009 16:35:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758180AbZKJVft (ORCPT ); Tue, 10 Nov 2009 16:35:49 -0500 Received: from 124x34x33x190.ap124.ftth.ucom.ne.jp ([124.34.33.190]:44481 "EHLO master.linux-sh.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755001AbZKJVfs (ORCPT ); Tue, 10 Nov 2009 16:35:48 -0500 Received: from localhost (unknown [127.0.0.1]) by master.linux-sh.org (Postfix) with ESMTP id 6DCCD63773; Tue, 10 Nov 2009 21:35:23 +0000 (UTC) X-Virus-Scanned: amavisd-new at linux-sh.org Received: from master.linux-sh.org ([127.0.0.1]) by localhost (master.linux-sh.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HKCV59G5XLx9; Wed, 11 Nov 2009 06:35:22 +0900 (JST) Received: from localhost (82-38-64-26.cable.ubr06.brad.blueyonder.co.uk [82.38.64.26]) by master.linux-sh.org (Postfix) with ESMTP id D158063758; Wed, 11 Nov 2009 06:35:21 +0900 (JST) From: Matt Fleming To: Paul Mundt Cc: linux-sh@vger.kernel.org Subject: [PATCH v3] sh: Add fixed ioremap support Date: Tue, 10 Nov 2009 21:35:50 +0000 Message-Id: <1257888950-14888-1-git-send-email-matt@console-pimps.org> X-Mailer: git-send-email 1.6.2.5 In-Reply-To: <1257887162-2721-1-git-send-email-matt@console-pimps.org> References: <1257887162-2721-1-git-send-email-matt@console-pimps.org> Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org diff --git a/arch/sh/include/asm/fixmap.h b/arch/sh/include/asm/fixmap.h index 76c5a30..0038881 100644 --- a/arch/sh/include/asm/fixmap.h +++ b/arch/sh/include/asm/fixmap.h @@ -54,19 +54,30 @@ enum fixed_addresses { FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1, #endif + /* + * FIX_IOREMAP entries are useful for mapping physical address + * space before ioremap() is useable, e.g. really early in boot + * before kmalloc() is working. + */ +#define FIX_N_IOREMAPS 32 + FIX_IOREMAP_BEGIN, + FIX_IOREMAP_END = FIX_IOREMAP_BEGIN + FIX_N_IOREMAPS, __end_of_fixed_addresses }; +#define FIXMAP_UPDATE_TLB 0x0001 /* Load the fixmap's pte into TLB */ +#define FIXMAP_CLEAR 0x0002 /* Clear (zero) the pte for fixmap */ + extern void __set_fixmap(enum fixed_addresses idx, - unsigned long phys, pgprot_t flags); + unsigned long phys, pgprot_t prot, int flags); #define set_fixmap(idx, phys) \ - __set_fixmap(idx, phys, PAGE_KERNEL) + __set_fixmap(idx, phys, PAGE_KERNEL, 0) /* * Some hardware wants to get fixmapped without caching. */ #define set_fixmap_nocache(idx, phys) \ - __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) + __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE, 0) /* * used by vmalloc.c. * diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h index 0cf2a57..1f11da7 100644 --- a/arch/sh/include/asm/io.h +++ b/arch/sh/include/asm/io.h @@ -294,6 +294,10 @@ __ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags) #define iounmap(addr) \ __iounmap((addr)) +extern void __iomem *ioremap_fixed(resource_size_t, unsigned long, pgprot_t); +extern void iounmap_fixed(void __iomem *); +extern void ioremap_fixed_init(void); + #define maybebadio(port) \ printk(KERN_ERR "bad PC-like io %s:%u for port 0x%lx at 0x%08x\n", \ __func__, __LINE__, (port), (u32)__builtin_return_address(0)) diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c index 5a947a2..dd0c86a 100644 --- a/arch/sh/kernel/setup.c +++ b/arch/sh/kernel/setup.c @@ -443,6 +443,10 @@ void __init setup_arch(char **cmdline_p) setup_memory(); sparse_init(); + paging_init(); + + ioremap_fixed_init(); + #ifdef CONFIG_DUMMY_CONSOLE conswitchp = &dummy_con; #endif @@ -451,8 +455,6 @@ void __init setup_arch(char **cmdline_p) if (likely(sh_mv.mv_setup)) sh_mv.mv_setup(cmdline_p); - paging_init(); - #ifdef CONFIG_PMB_ENABLE pmb_init(); #endif diff --git a/arch/sh/mm/Makefile b/arch/sh/mm/Makefile index 8a70535..f554730 100644 --- a/arch/sh/mm/Makefile +++ b/arch/sh/mm/Makefile @@ -15,7 +15,8 @@ obj-y += $(cacheops-y) mmu-y := nommu.o extable_32.o mmu-$(CONFIG_MMU) := extable_$(BITS).o fault_$(BITS).o \ - ioremap_$(BITS).o kmap.o tlbflush_$(BITS).o + ioremap_$(BITS).o ioremap_fixed.o kmap.o \ + tlbflush_$(BITS).o obj-y += $(mmu-y) obj-$(CONFIG_DEBUG_FS) += asids-debugfs.o diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c index 432acd0..513fa39 100644 --- a/arch/sh/mm/init.c +++ b/arch/sh/mm/init.c @@ -39,7 +39,8 @@ unsigned long cached_to_uncached = P2SEG - P1SEG; #endif #ifdef CONFIG_MMU -static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) +static void set_pte_phys(unsigned long addr, unsigned long phys, + pgprot_t prot, int flags) { pgd_t *pgd; pud_t *pud; @@ -65,13 +66,16 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) } pte = pte_offset_kernel(pmd, addr); - if (!pte_none(*pte)) { + if ((flags & FIXMAP_CLEAR) && !pte_none(*pte)) { pte_ERROR(*pte); return; } set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); local_flush_tlb_one(get_asid(), addr); + + if (flags & FIXMAP_UPDATE_TLB) + __update_tlb(NULL, addr, *pte); } /* @@ -89,7 +93,8 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) * * -- PFM. */ -void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) +void __set_fixmap(enum fixed_addresses idx, unsigned long phys, + pgprot_t prot, int flags) { unsigned long address = __fix_to_virt(idx); @@ -98,7 +103,7 @@ void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) return; } - set_pte_phys(address, phys, prot); + set_pte_phys(address, phys, prot, flags); } void __init page_table_range_init(unsigned long start, unsigned long end, diff --git a/arch/sh/mm/ioremap_fixed.c b/arch/sh/mm/ioremap_fixed.c new file mode 100644 index 0000000..40a80fe --- /dev/null +++ b/arch/sh/mm/ioremap_fixed.c @@ -0,0 +1,141 @@ +/* + * Re-map IO memory to kernel address space so that we can access it. + * + * These functions should only be used when it is necessary to map a + * physical address space into the kernel address space before ioremap() + * can be used, e.g. early in boot before paging_init(). + * + * Copyright (C) 2009 Matt Fleming + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct ioremap_map { + void __iomem *addr; + unsigned long size; + unsigned long fixmap_addr; +}; + +static struct ioremap_map ioremap_maps[FIX_N_IOREMAPS]; + +void __init ioremap_fixed_init(void) +{ + struct ioremap_map *map; + int i; + + for (i = 0; i < FIX_N_IOREMAPS; i++) { + map = &ioremap_maps[i]; + map->fixmap_addr = __fix_to_virt(FIX_IOREMAP_BEGIN + i); + } +} + +void __init __iomem * +ioremap_fixed(resource_size_t phys_addr, unsigned long size, pgprot_t prot) +{ + enum fixed_addresses idx0, idx; + resource_size_t last_addr; + struct ioremap_map *map; + unsigned long offset; + unsigned int nrpages; + int i, slot; + + slot = -1; + for (i = 0; i < FIX_N_IOREMAPS; i++) { + map = &ioremap_maps[i]; + if (!map->addr) { + map->size = size; + slot = i; + break; + } + } + + if (slot < 0) + return NULL; + + /* Don't allow wraparound or zero size */ + last_addr = phys_addr + size - 1; + if (!size || last_addr < phys_addr) + return NULL; + + /* + * Fixmap mappings have to be page-aligned + */ + offset = phys_addr & ~PAGE_MASK; + phys_addr &= PAGE_MASK; + size = PAGE_ALIGN(last_addr + 1) - phys_addr; + + /* + * Mappings have to fit in the FIX_IOREMAP area. + */ + nrpages = size >> PAGE_SHIFT; + if (nrpages > FIX_N_IOREMAPS) + return NULL; + + /* + * Ok, go for it.. + */ + idx0 = FIX_IOREMAP_BEGIN + slot; + idx = idx0; + while (nrpages > 0) { + + __set_fixmap(idx, phys_addr, prot, FIXMAP_UPDATE_TLB); + phys_addr += PAGE_SIZE; + idx++; + --nrpages; + } + + map->addr = (void __iomem *)(offset + map->fixmap_addr); + return map->addr; +} + +void __init iounmap_fixed(void __iomem *addr) +{ + enum fixed_addresses idx; + unsigned long virt_addr; + struct ioremap_map *map; + unsigned long offset; + unsigned int nrpages; + int i, slot; + + slot = -1; + for (i = 0; i < FIX_N_IOREMAPS; i++) { + map = &ioremap_maps[i]; + if (map->addr == addr) { + slot = i; + break; + } + } + + if (slot < 0) + return; + + virt_addr = (unsigned long)addr; + + offset = virt_addr & ~PAGE_MASK; + nrpages = PAGE_ALIGN(offset + map->size - 1) >> PAGE_SHIFT; + + idx = FIX_IOREMAP_BEGIN + slot; + while (nrpages > 0) { + __set_fixmap(idx, 0, __pgprot(0), 0); + idx++; + --nrpages; + } + + map->size = 0; + map->addr = NULL; +} diff --git a/arch/sh/mm/nommu.c b/arch/sh/mm/nommu.c index ac16c05..4b4eb50 100644 --- a/arch/sh/mm/nommu.c +++ b/arch/sh/mm/nommu.c @@ -91,6 +91,7 @@ void __init page_table_range_init(unsigned long start, unsigned long end, { } -void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) +void __set_fixmap(enum fixed_addresses idx, unsigned long phys, + pgprot_t prot, int flags) { }