Leo Yan | 3c7241b | 2011-08-15 11:09:52 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * linux/arch/arm/mach-mmp/sram.c |
| 3 | * |
| 4 | * based on mach-davinci/sram.c - DaVinci simple SRAM allocator |
| 5 | * |
| 6 | * Copyright (c) 2011 Marvell Semiconductors Inc. |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * Add for mmp sram support - Leo Yan <leoy@marvell.com> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License version 2 as |
| 13 | * published by the Free Software Foundation. |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/platform_device.h> |
| 20 | #include <linux/io.h> |
| 21 | #include <linux/err.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/genalloc.h> |
| 24 | |
| 25 | #include <mach/sram.h> |
| 26 | |
| 27 | struct sram_bank_info { |
| 28 | char *pool_name; |
| 29 | struct gen_pool *gpool; |
| 30 | int granularity; |
| 31 | |
| 32 | phys_addr_t sram_phys; |
| 33 | void __iomem *sram_virt; |
| 34 | u32 sram_size; |
| 35 | |
| 36 | struct list_head node; |
| 37 | }; |
| 38 | |
| 39 | static DEFINE_MUTEX(sram_lock); |
| 40 | static LIST_HEAD(sram_bank_list); |
| 41 | |
| 42 | struct gen_pool *sram_get_gpool(char *pool_name) |
| 43 | { |
| 44 | struct sram_bank_info *info = NULL; |
| 45 | |
| 46 | if (!pool_name) |
| 47 | return NULL; |
| 48 | |
| 49 | mutex_lock(&sram_lock); |
| 50 | |
| 51 | list_for_each_entry(info, &sram_bank_list, node) |
| 52 | if (!strcmp(pool_name, info->pool_name)) |
| 53 | break; |
| 54 | |
| 55 | mutex_unlock(&sram_lock); |
| 56 | |
| 57 | if (&info->node == &sram_bank_list) |
| 58 | return NULL; |
| 59 | |
| 60 | return info->gpool; |
| 61 | } |
| 62 | EXPORT_SYMBOL(sram_get_gpool); |
| 63 | |
| 64 | static int __devinit sram_probe(struct platform_device *pdev) |
| 65 | { |
| 66 | struct sram_platdata *pdata = pdev->dev.platform_data; |
| 67 | struct sram_bank_info *info; |
| 68 | struct resource *res; |
| 69 | int ret = 0; |
| 70 | |
| 71 | if (!pdata && !pdata->pool_name) |
| 72 | return -ENODEV; |
| 73 | |
| 74 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
| 75 | if (!info) |
| 76 | return -ENOMEM; |
| 77 | |
| 78 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 79 | if (res == NULL) { |
| 80 | dev_err(&pdev->dev, "no memory resource defined\n"); |
| 81 | ret = -ENODEV; |
| 82 | goto out; |
| 83 | } |
| 84 | |
| 85 | if (!resource_size(res)) |
| 86 | return 0; |
| 87 | |
| 88 | info->sram_phys = (phys_addr_t)res->start; |
| 89 | info->sram_size = resource_size(res); |
| 90 | info->sram_virt = ioremap(info->sram_phys, info->sram_size); |
| 91 | info->pool_name = kstrdup(pdata->pool_name, GFP_KERNEL); |
| 92 | info->granularity = pdata->granularity; |
| 93 | |
| 94 | info->gpool = gen_pool_create(ilog2(info->granularity), -1); |
| 95 | if (!info->gpool) { |
| 96 | dev_err(&pdev->dev, "create pool failed\n"); |
| 97 | ret = -ENOMEM; |
| 98 | goto create_pool_err; |
| 99 | } |
| 100 | |
| 101 | ret = gen_pool_add_virt(info->gpool, (unsigned long)info->sram_virt, |
| 102 | info->sram_phys, info->sram_size, -1); |
| 103 | if (ret < 0) { |
| 104 | dev_err(&pdev->dev, "add new chunk failed\n"); |
| 105 | ret = -ENOMEM; |
| 106 | goto add_chunk_err; |
| 107 | } |
| 108 | |
| 109 | mutex_lock(&sram_lock); |
| 110 | list_add(&info->node, &sram_bank_list); |
| 111 | mutex_unlock(&sram_lock); |
| 112 | |
| 113 | platform_set_drvdata(pdev, info); |
| 114 | |
| 115 | dev_info(&pdev->dev, "initialized\n"); |
| 116 | return 0; |
| 117 | |
| 118 | add_chunk_err: |
| 119 | gen_pool_destroy(info->gpool); |
| 120 | create_pool_err: |
| 121 | iounmap(info->sram_virt); |
| 122 | kfree(info->pool_name); |
| 123 | out: |
| 124 | kfree(info); |
| 125 | return ret; |
| 126 | } |
| 127 | |
| 128 | static int __devexit sram_remove(struct platform_device *pdev) |
| 129 | { |
| 130 | struct sram_bank_info *info; |
| 131 | |
| 132 | info = platform_get_drvdata(pdev); |
| 133 | if (info == NULL) |
| 134 | return -ENODEV; |
| 135 | |
| 136 | mutex_lock(&sram_lock); |
| 137 | list_del(&info->node); |
| 138 | mutex_unlock(&sram_lock); |
| 139 | |
| 140 | gen_pool_destroy(info->gpool); |
| 141 | iounmap(info->sram_virt); |
| 142 | kfree(info->pool_name); |
| 143 | kfree(info); |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | static const struct platform_device_id sram_id_table[] = { |
| 148 | { "asram", MMP_ASRAM }, |
| 149 | { "isram", MMP_ISRAM }, |
| 150 | { } |
| 151 | }; |
| 152 | |
| 153 | static struct platform_driver sram_driver = { |
| 154 | .probe = sram_probe, |
| 155 | .remove = sram_remove, |
| 156 | .driver = { |
| 157 | .name = "mmp-sram", |
| 158 | }, |
| 159 | .id_table = sram_id_table, |
| 160 | }; |
| 161 | |
| 162 | static int __init sram_init(void) |
| 163 | { |
| 164 | return platform_driver_register(&sram_driver); |
| 165 | } |
| 166 | core_initcall(sram_init); |
| 167 | |
| 168 | MODULE_LICENSE("GPL"); |