diff options
Diffstat (limited to 'drivers/staging/msm/memory.c')
| -rw-r--r-- | drivers/staging/msm/memory.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/drivers/staging/msm/memory.c b/drivers/staging/msm/memory.c new file mode 100644 index 000000000000..cc80fdf17d61 --- /dev/null +++ b/drivers/staging/msm/memory.c @@ -0,0 +1,214 @@ +/* arch/arm/mach-msm/memory.c + * + * Copyright (C) 2007 Google, Inc. + * Copyright (c) 2009-2010, Code Aurora Forum. All rights reserved. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/mm.h> +#include <linux/mm_types.h> +#include <linux/bootmem.h> +#include <linux/module.h> +#include <asm/pgtable.h> +#include <asm/io.h> +#include <asm/mach/map.h> +#include "memory_ll.h" +#include <asm/cacheflush.h> +#if defined(CONFIG_MSM_NPA_REMOTE) +#include "npa_remote.h" +#include <linux/completion.h> +#include <linux/err.h> +#endif + +int arch_io_remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, + unsigned long pfn, unsigned long size, pgprot_t prot) +{ + unsigned long pfn_addr = pfn << PAGE_SHIFT; +/* + if ((pfn_addr >= 0x88000000) && (pfn_addr < 0xD0000000)) { + prot = pgprot_device(prot); + printk("remapping device %lx\n", prot); + } +*/ + panic("Memory remap PFN stuff not done\n"); + return remap_pfn_range(vma, addr, pfn, size, prot); +} + +void *zero_page_strongly_ordered; + +static void map_zero_page_strongly_ordered(void) +{ + if (zero_page_strongly_ordered) + return; +/* + zero_page_strongly_ordered = + ioremap_strongly_ordered(page_to_pfn(empty_zero_page) + << PAGE_SHIFT, PAGE_SIZE); +*/ + panic("Strongly ordered memory functions not implemented\n"); +} + +void write_to_strongly_ordered_memory(void) +{ + map_zero_page_strongly_ordered(); + *(int *)zero_page_strongly_ordered = 0; +} +EXPORT_SYMBOL(write_to_strongly_ordered_memory); + +void flush_axi_bus_buffer(void) +{ + __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \ + : : "r" (0) : "memory"); + write_to_strongly_ordered_memory(); +} + +#define CACHE_LINE_SIZE 32 + +/* These cache related routines make the assumption that the associated + * physical memory is contiguous. They will operate on all (L1 + * and L2 if present) caches. + */ +void clean_and_invalidate_caches(unsigned long vstart, + unsigned long length, unsigned long pstart) +{ + unsigned long vaddr; + + for (vaddr = vstart; vaddr < vstart + length; vaddr += CACHE_LINE_SIZE) + asm ("mcr p15, 0, %0, c7, c14, 1" : : "r" (vaddr)); +#ifdef CONFIG_OUTER_CACHE + outer_flush_range(pstart, pstart + length); +#endif + asm ("mcr p15, 0, %0, c7, c10, 4" : : "r" (0)); + asm ("mcr p15, 0, %0, c7, c5, 0" : : "r" (0)); + + flush_axi_bus_buffer(); +} + +void clean_caches(unsigned long vstart, + unsigned long length, unsigned long pstart) +{ + unsigned long vaddr; + + for (vaddr = vstart; vaddr < vstart + length; vaddr += CACHE_LINE_SIZE) + asm ("mcr p15, 0, %0, c7, c10, 1" : : "r" (vaddr)); +#ifdef CONFIG_OUTER_CACHE + outer_clean_range(pstart, pstart + length); +#endif + asm ("mcr p15, 0, %0, c7, c10, 4" : : "r" (0)); + asm ("mcr p15, 0, %0, c7, c5, 0" : : "r" (0)); + + flush_axi_bus_buffer(); +} + +void invalidate_caches(unsigned long vstart, + unsigned long length, unsigned long pstart) +{ + unsigned long vaddr; + + for (vaddr = vstart; vaddr < vstart + length; vaddr += CACHE_LINE_SIZE) + asm ("mcr p15, 0, %0, c7, c6, 1" : : "r" (vaddr)); +#ifdef CONFIG_OUTER_CACHE + outer_inv_range(pstart, pstart + length); +#endif + asm ("mcr p15, 0, %0, c7, c10, 4" : : "r" (0)); + asm ("mcr p15, 0, %0, c7, c5, 0" : : "r" (0)); + + flush_axi_bus_buffer(); +} + +void *alloc_bootmem_aligned(unsigned long size, unsigned long alignment) +{ + void *unused_addr = NULL; + unsigned long addr, tmp_size, unused_size; + + /* Allocate maximum size needed, see where it ends up. + * Then free it -- in this path there are no other allocators + * so we can depend on getting the same address back + * when we allocate a smaller piece that is aligned + * at the end (if necessary) and the piece we really want, + * then free the unused first piece. + */ + + tmp_size = size + alignment - PAGE_SIZE; + addr = (unsigned long)alloc_bootmem(tmp_size); + free_bootmem(__pa(addr), tmp_size); + + unused_size = alignment - (addr % alignment); + if (unused_size) + unused_addr = alloc_bootmem(unused_size); + + addr = (unsigned long)alloc_bootmem(size); + if (unused_size) + free_bootmem(__pa(unused_addr), unused_size); + + return (void *)addr; +} + +#if defined(CONFIG_MSM_NPA_REMOTE) +struct npa_client *npa_memory_client; +#endif + +static int change_memory_power_state(unsigned long start_pfn, + unsigned long nr_pages, int state) +{ +#if defined(CONFIG_MSM_NPA_REMOTE) + static atomic_t node_created_flag = ATOMIC_INIT(1); +#else + unsigned long start; + unsigned long size; + unsigned long virtual; +#endif + int rc = 0; + +#if defined(CONFIG_MSM_NPA_REMOTE) + if (atomic_dec_and_test(&node_created_flag)) { + /* Create NPA 'required' client. */ + npa_memory_client = npa_create_sync_client(NPA_MEMORY_NODE_NAME, + "memory node", NPA_CLIENT_REQUIRED); + if (IS_ERR(npa_memory_client)) { + rc = PTR_ERR(npa_memory_client); + return rc; + } + } + + rc = npa_issue_required_request(npa_memory_client, state); +#else + if (state == MEMORY_DEEP_POWERDOWN) { + /* simulate turning off memory by writing bit pattern into it */ + start = start_pfn << PAGE_SHIFT; + size = nr_pages << PAGE_SHIFT; + virtual = __phys_to_virt(start); + memset((void *)virtual, 0x27, size); + } +#endif + return rc; +} + +int platform_physical_remove_pages(unsigned long start_pfn, + unsigned long nr_pages) +{ + return change_memory_power_state(start_pfn, nr_pages, + MEMORY_DEEP_POWERDOWN); +} + +int platform_physical_add_pages(unsigned long start_pfn, + unsigned long nr_pages) +{ + return change_memory_power_state(start_pfn, nr_pages, MEMORY_ACTIVE); +} + +int platform_physical_low_power_pages(unsigned long start_pfn, + unsigned long nr_pages) +{ + return change_memory_power_state(start_pfn, nr_pages, + MEMORY_SELF_REFRESH); +} |