Sylvain Munaut | 2f9ea1b | 2007-09-16 20:53:27 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Simple memory allocator for on-board SRAM |
| 3 | * |
| 4 | * |
| 5 | * Maintainer : Sylvain Munaut <tnt@246tNt.com> |
| 6 | * |
| 7 | * Copyright (C) 2005 Sylvain Munaut <tnt@246tNt.com> |
| 8 | * |
| 9 | * This file is licensed under the terms of the GNU General Public License |
| 10 | * version 2. This program is licensed "as is" without any warranty of any |
| 11 | * kind, whether express or implied. |
| 12 | */ |
| 13 | |
Grant Likely | 22ae782 | 2010-07-29 11:49:01 -0600 | [diff] [blame] | 14 | #include <linux/err.h> |
Sylvain Munaut | 2f9ea1b | 2007-09-16 20:53:27 +1000 | [diff] [blame] | 15 | #include <linux/kernel.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/spinlock.h> |
| 19 | #include <linux/string.h> |
| 20 | #include <linux/ioport.h> |
| 21 | #include <linux/of.h> |
| 22 | |
| 23 | #include <asm/io.h> |
| 24 | #include <asm/mmu.h> |
| 25 | |
| 26 | #include "sram.h" |
| 27 | |
| 28 | |
| 29 | /* Struct keeping our 'state' */ |
| 30 | struct bcom_sram *bcom_sram = NULL; |
| 31 | EXPORT_SYMBOL_GPL(bcom_sram); /* needed for inline functions */ |
| 32 | |
| 33 | |
| 34 | /* ======================================================================== */ |
| 35 | /* Public API */ |
| 36 | /* ======================================================================== */ |
| 37 | /* DO NOT USE in interrupts, if needed in irq handler, we should use the |
| 38 | _irqsave version of the spin_locks */ |
| 39 | |
| 40 | int bcom_sram_init(struct device_node *sram_node, char *owner) |
| 41 | { |
| 42 | int rv; |
| 43 | const u32 *regaddr_p; |
| 44 | u64 regaddr64, size64; |
| 45 | unsigned int psize; |
| 46 | |
| 47 | /* Create our state struct */ |
| 48 | if (bcom_sram) { |
| 49 | printk(KERN_ERR "%s: bcom_sram_init: " |
| 50 | "Already initialized !\n", owner); |
| 51 | return -EBUSY; |
| 52 | } |
| 53 | |
| 54 | bcom_sram = kmalloc(sizeof(struct bcom_sram), GFP_KERNEL); |
| 55 | if (!bcom_sram) { |
| 56 | printk(KERN_ERR "%s: bcom_sram_init: " |
| 57 | "Couldn't allocate internal state !\n", owner); |
| 58 | return -ENOMEM; |
| 59 | } |
| 60 | |
| 61 | /* Get address and size of the sram */ |
| 62 | regaddr_p = of_get_address(sram_node, 0, &size64, NULL); |
| 63 | if (!regaddr_p) { |
| 64 | printk(KERN_ERR "%s: bcom_sram_init: " |
| 65 | "Invalid device node !\n", owner); |
| 66 | rv = -EINVAL; |
| 67 | goto error_free; |
| 68 | } |
| 69 | |
| 70 | regaddr64 = of_translate_address(sram_node, regaddr_p); |
| 71 | |
| 72 | bcom_sram->base_phys = (phys_addr_t) regaddr64; |
| 73 | bcom_sram->size = (unsigned int) size64; |
| 74 | |
| 75 | /* Request region */ |
| 76 | if (!request_mem_region(bcom_sram->base_phys, bcom_sram->size, owner)) { |
| 77 | printk(KERN_ERR "%s: bcom_sram_init: " |
| 78 | "Couldn't request region !\n", owner); |
| 79 | rv = -EBUSY; |
| 80 | goto error_free; |
| 81 | } |
| 82 | |
| 83 | /* Map SRAM */ |
| 84 | /* sram is not really __iomem */ |
| 85 | bcom_sram->base_virt = (void*) ioremap(bcom_sram->base_phys, bcom_sram->size); |
| 86 | |
| 87 | if (!bcom_sram->base_virt) { |
| 88 | printk(KERN_ERR "%s: bcom_sram_init: " |
| 89 | "Map error SRAM zone 0x%08lx (0x%0x)!\n", |
Grant Likely | 08b6c06 | 2008-07-11 16:17:58 -0600 | [diff] [blame] | 90 | owner, (long)bcom_sram->base_phys, bcom_sram->size ); |
Sylvain Munaut | 2f9ea1b | 2007-09-16 20:53:27 +1000 | [diff] [blame] | 91 | rv = -ENOMEM; |
| 92 | goto error_release; |
| 93 | } |
| 94 | |
| 95 | /* Create an rheap (defaults to 32 bits word alignment) */ |
| 96 | bcom_sram->rh = rh_create(4); |
| 97 | |
| 98 | /* Attach the free zones */ |
| 99 | #if 0 |
| 100 | /* Currently disabled ... for future use only */ |
| 101 | reg_addr_p = of_get_property(sram_node, "available", &psize); |
| 102 | #else |
| 103 | regaddr_p = NULL; |
| 104 | psize = 0; |
| 105 | #endif |
| 106 | |
| 107 | if (!regaddr_p || !psize) { |
| 108 | /* Attach the whole zone */ |
| 109 | rh_attach_region(bcom_sram->rh, 0, bcom_sram->size); |
| 110 | } else { |
| 111 | /* Attach each zone independently */ |
| 112 | while (psize >= 2 * sizeof(u32)) { |
| 113 | phys_addr_t zbase = of_translate_address(sram_node, regaddr_p); |
| 114 | rh_attach_region(bcom_sram->rh, zbase - bcom_sram->base_phys, regaddr_p[1]); |
| 115 | regaddr_p += 2; |
| 116 | psize -= 2 * sizeof(u32); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | /* Init our spinlock */ |
| 121 | spin_lock_init(&bcom_sram->lock); |
| 122 | |
| 123 | return 0; |
| 124 | |
| 125 | error_release: |
| 126 | release_mem_region(bcom_sram->base_phys, bcom_sram->size); |
| 127 | error_free: |
| 128 | kfree(bcom_sram); |
| 129 | bcom_sram = NULL; |
| 130 | |
| 131 | return rv; |
| 132 | } |
| 133 | EXPORT_SYMBOL_GPL(bcom_sram_init); |
| 134 | |
| 135 | void bcom_sram_cleanup(void) |
| 136 | { |
| 137 | /* Free resources */ |
| 138 | if (bcom_sram) { |
| 139 | rh_destroy(bcom_sram->rh); |
| 140 | iounmap((void __iomem *)bcom_sram->base_virt); |
| 141 | release_mem_region(bcom_sram->base_phys, bcom_sram->size); |
| 142 | kfree(bcom_sram); |
| 143 | bcom_sram = NULL; |
| 144 | } |
| 145 | } |
| 146 | EXPORT_SYMBOL_GPL(bcom_sram_cleanup); |
| 147 | |
| 148 | void* bcom_sram_alloc(int size, int align, phys_addr_t *phys) |
| 149 | { |
| 150 | unsigned long offset; |
| 151 | |
| 152 | spin_lock(&bcom_sram->lock); |
| 153 | offset = rh_alloc_align(bcom_sram->rh, size, align, NULL); |
| 154 | spin_unlock(&bcom_sram->lock); |
| 155 | |
| 156 | if (IS_ERR_VALUE(offset)) |
| 157 | return NULL; |
| 158 | |
| 159 | *phys = bcom_sram->base_phys + offset; |
| 160 | return bcom_sram->base_virt + offset; |
| 161 | } |
| 162 | EXPORT_SYMBOL_GPL(bcom_sram_alloc); |
| 163 | |
| 164 | void bcom_sram_free(void *ptr) |
| 165 | { |
| 166 | unsigned long offset; |
| 167 | |
| 168 | if (!ptr) |
| 169 | return; |
| 170 | |
| 171 | offset = ptr - bcom_sram->base_virt; |
| 172 | |
| 173 | spin_lock(&bcom_sram->lock); |
| 174 | rh_free(bcom_sram->rh, offset); |
| 175 | spin_unlock(&bcom_sram->lock); |
| 176 | } |
| 177 | EXPORT_SYMBOL_GPL(bcom_sram_free); |
| 178 | |